CA2647055A1 - Iontophoresis device - Google Patents

Iontophoresis device Download PDF

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Publication number
CA2647055A1
CA2647055A1 CA002647055A CA2647055A CA2647055A1 CA 2647055 A1 CA2647055 A1 CA 2647055A1 CA 002647055 A CA002647055 A CA 002647055A CA 2647055 A CA2647055 A CA 2647055A CA 2647055 A1 CA2647055 A1 CA 2647055A1
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Canada
Prior art keywords
drug
substrate
needle
ion
holding part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002647055A
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French (fr)
Inventor
Akihiko Matsumura
Takehiko Matsumura
Mizuo Nakayama
Hidero Akiyama
Tsutomu Shibata
Akihiko Tanioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TTI Ellebeau Inc
Original Assignee
Tti Ellebeau, Inc.
Akihiko Matsumura
Takehiko Matsumura
Mizuo Nakayama
Hidero Akiyama
Tsutomu Shibata
Akihiko Tanioka
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tti Ellebeau, Inc., Akihiko Matsumura, Takehiko Matsumura, Mizuo Nakayama, Hidero Akiyama, Tsutomu Shibata, Akihiko Tanioka filed Critical Tti Ellebeau, Inc.
Priority claimed from PCT/JP2006/305747 external-priority patent/WO2006101146A1/en
Publication of CA2647055A1 publication Critical patent/CA2647055A1/en
Abandoned legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/18Applying electric currents by contact electrodes
    • A61N1/20Applying electric currents by contact electrodes continuous direct currents
    • A61N1/30Apparatus for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body, or cataphoresis
    • A61N1/303Constructional details
    • A61N1/306Arrangements where at least part of the apparatus is introduced into the body

Abstract

An iontophoresis device capable of administering of first drug ions resulting from dissociation in conductive form through a skin contact member having multiple needlelike items for skin puncturing, wherein an element capable of selective permeation of first conductive ions is disposed between a drug retention part for retaining of drug ions and the skin of living body as recipient of the drug ions. Thus, there is provided an iontophoresis device that can not only enhance the rate of drug administration and the efficiency thereof but also realize administration of drugs of high molecular weight, such as proteins and peptides.

Description

SPECIFICATION
IONTOPHORESIS DEVICE

FIELD OF THE INVENTION
[0001] The present invention relates to an iontophoresis device for applying an electrical field to a drug dissociated into cations or anions in a solution to thereby percutaneously drive the ions (anions and cations) to a living body.

BACKGROUND OF THE INVENTION
[0002] Iontophoresis is a technique of applying an electric field to a drug dissociated into cations or anions in a solution to thereby allow the ions (anions and cations) to percutaneously transfer into a living body. This technique is considered one of promising administration methods in terms of little pain on a patient and high dosage controllability. Nowadays iontophoresis is applied to administration of various drugs.
[0003] However, an ion mobility based on the electric field application tends to decrease in inverse proportion to a molecular weight of an ion. In addition, a higher-molecular-weight ion is more difficult to permeate through the skin (especially, stratum corneum). Hence, it has been said that a drug coritaining macromolecules such as protein or peptide molecules is hardly delivered through iontophoresis.
[0004] JP 10-5101`75 A discloses an iontophoresis device as shown in FIG. 6, as a device capable of delivering such a drug cor.ttaining macromolecules.
[0005] As shown in FIG. 6, the device is structured such that a skin contact member (transferring means) 215 is interposed between a drug holding part (reservoir layer) 214 and a skin 240, the skin contact member having a substrate (supporting layer) on which plural needle-like members 252 to be punctured into the skin 240 are formed, and a voltage applied from an electrode 211 allows drug ions in the drug holding part 214 to pass through holes (fl(Dw path) 253 formed inside the needle-like members 252 and migrate into the skin 240.
[0006] As described in JP 10-5101'75 A, the needle-like members 252 are formed into the lengths enough for the needle to pass completely or halfway through the stratum corneum 241 with substantially or absolutely no damage on an underlying skin surface 242. More specifically, the length (LN) of the needle 252 is set to 1, 000 pm (maximum) or shorter, particularly preferably, 1 pm to 500 pm. Hence, it is possible to eliminate pains on a patient at the time of delivering a drug. In addition, a porosity of the skin contact member 215 is set to 30% (maximum) or smaller. More specifically, the holes 253 or the needle-like members 252 are formed in the skin contact member at the density of about 2,500 (holes or needle-like members)Jcm`. The holes 253 each have a length (LK) of 1 pm to 3,000 pm, particularly preferably, 10 pm to 1, 000 pm, and the diameter of 0. 03 pm to 300 pm, particularly preferably 0.1 pm to 100 pm. Hence, a drug can be delivered in sufficient amounts.
[0007] However, as a result of studies made by the inventors of the present invention, it was revealed that a delivery speed of a high-molecular-weight drug (drug containing macromolecules such as protein or peptide molecules) is far from sufficient even with the use of the device disclosed in JP 10-510175 A. In particular, the device faces a problem in that under such current or voltage conditions that cause no damage on the skin, it is impossible to deliver an effective amount of drug within a period allowable as a drug delivery period.
[0008] Patent Document 1:JP 10-510175 A
Patent Document 2:US 6256533 A
Patent Document 3:JP 2005-503194 A

DISCLOSURE OF INVENTION
PROBLEMS TO BE SOLVED
[0009] The present invention has been made in view of the above-described problem, and it is therefore an object of the present invention to provide an iontophoresis device capable of delivering to a living body, an ionizable drug (drug whose active ingredients dissociate into cations or anions when dissolved) of high-molecular-weight containing macromolecules such as protein or peptide molecules at high speed or with high efficiency.
[0010] It is another object of the present invention to provide an iontophoresis device capable of delivering a high-molecular-weight ionizable drug containing macromolecules such as protein or peptide molecules with high efficiency under lower current or voltage conditions.
[0011] It is still another object of the present invention to provide an iontophoresis device capable of delivering an ionizable drug with an efficiency or speed much higher than conventional iontophoresis devices including the device disclosed in JP
10-510175 A, irrespective of a molecular weight of the ionizable drug.
[0012] It is yet still another object of the present invention to provide an iontophoresis device capable of delivering an ionizable drug with high efficiency under low current or voltage conditions as compared with conventional iontophoresis devices including the device disclosed in JP 10-510175 A, irrespective of a molecular weight of the ionizalbe drug.

MEANS FOR SOLVING PROBLEMS
[001.3] The present invention is on an iontophoresis device for administering drug ions dissociated into a first conductivitytype by way of a plurality of needle-like members to be punctured into skin, wherein an element having a function for selectively passing ions of the first conductivity type is placed between a drug holding part for holding the drug ions and the skin to which the drug ions are administered, and the above mentioned problems are solved by the iontophoresis device above. In concrete, the above mentioned problems are solved by the inventions in the first to fifth embodiments below.
[0014} That is, according to the first embodiment of the present invention, the above mentioned problems are solved by an iontophoresis device having a working electrode structure, said working electrode structure comprising:
a first electrode;
a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin; and a drug holding part to be applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
a hole communicating between a tip end of each of the needle-like members and the rear surface of the substrate is formed in the needle-like members, and the hole of the needle is filled with an ion-exchange resin which is introduced second polarity or conductivity type ion exchange groups.
[0015} According to the f:irst embodiment, a f irst-conductivity-type voltage is applied to the f irst electrode to deliver drug ions in the drug holding part into the living body through the needle-like members punctured into the skin which have penetrated through the stratum corneum, as in Patent Document 1.
Further, second polarity or conductivity type ion exchange groups are introduced into the ion exchange resin filling the holes. The ion exchange groups prevent backflow of biological counter ions from the living body to the drug holding part.
[0016] Thus, it is possible to avoid a situation in which most of current supplied to the first electrode is dissipated by transference of biological counter ion (particularly, biological counter ion having a low molecular weight, i.e. highmobility, such as Na+ or C1 ) to the iontophoresis device. Therefore, a larger amount of current supplied to the first electrode can be used for delivery of the drug ions to the living body, thereby considerably enhancing drug delivery efficiency and delivery speed.
[0017] The iontophoresis device according to the present invention attains the above effects and thus makes it possible to improve drug ion delivery efficiency or speed regardless of a molecular weight of a drug ion, or to further lower current or voltage conditions for the drug delivery, and deliver even drug ions of macromolecules such as protein or peptide molecules under lower current or voltage conditions at higher speed or higher efficiency.

[0018] For the ion-exchange resin introducing second pol.arity or conductivity type ion exchange groups in the present invention, any known ion-exchange resin can be used. Examples thereof include an ion-exchange resin prepared by introducing a cation-exchange group (a group whose counter ion is cation) such as a sulforiic group, a carboxylic group, and a phosphonic group, or an anion-exchange group (a group whose counter ion is anion) such as primary to tertiary amino groups, a quaternary ammonium group, a pyridyl group, an imidazole group, a quaternary pyridinium group, or a quaternary imidazolium group, to a polymer having a three-dimensional network structure such as hydrocarbon-based resins such as a polystyrene resin or acrylic acid resin or fluororesin-based resins having a perfluorocarbon backbone.
[0019] The ion-exchange resin may be filled into the hole of the needle-like members by using any method, for example, by infiltrating or impregnating a monomer forming the hydrocarbon resin and blended with a cross-linking agent into the holes to cause a cross-linking reaction, or infiltrating or impregnating a powdery ion-exchange resin blended with a given binder polymer into the hole, and optionally curing the binder polymer.
[0020] Each of the needle-like members of the present invention preferably protrude from the substrate by a length enough for the needle-like member to pass through all or most of a stratum corneum which is regarded as a main barrier against percutaneous delivery of a drug. The length of the needle-like member is preferably l, 000 pm or shorter, particularly preferably, 1}.im to 300 pm. The inner diameter of each of the holes formed in needle-like members can be set, for example, to 0.03 um to 300 um, particularly preferably, 0.1 pm to 100 pm. The length of each of the holes from the rear surface of the substrate to the tip ends of the needle-like members is preferably set, for example, to 1 um to 3, 000 pm, particularly preferably, 10 pm to 500 pm.
[0021] The needle-like members or the skin contact member of the present invention can be formed of an organic material such as hard plastics or an inorganic material such as silicon by utilizing known methods such as lithography, molding, andlaserirradiation.
[0022] According to the second embodiment of the present invention, the above mentioned problems are solved by an iontophoresis device having a working electrode structure, said working electrode structure comprising:
a first electrode;
a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:

a hole communicating between a tip end of each of the needle-like members and the rear surface of the substrate is formed in the needle-like members, and the skin contact member further includes a first ion-exchange membrane that is interposed between the drug holding part and the substrate and allows selective permeation of the ions of the first conductivity type.
[0023] In the second embodiment of the present invention, the first-conductivity-type voltage is applied to the first electrode, whereby drug ions in the drug holding part are delivered through the holes formed in the needle-like members into the skin. Further, the biological counter ions cannot pass through the first ion-exchange membrane by the function of the first ion-exchange membrane and thus are accumulated in the holes of the needle-like members or a space between the skin contact member and the first ion-exchange membrane. As a result, the transference of the biological counter ion is substantially blocked. Therefore, the drug ions can be delivered with delivery efficiency or speed comparable or approximate to that of the first embodiment of the invention.
[ 0024 ] The needle-like members or the skin contact member of the second embodiment may have the same constituent as that of the first embodiment.
[0025] Further, any ion-exchange membrane having a function of allowing selective passage of ions of a first conductivity type and blocking or suppressing the passage of ions of a second conductivity type can be used as the first ion-exchange membrane of the second embodiment. An ion-exchange membrane, pores of a porous film of which are partially or completely filled with an ion-exchange resin introduced with a second polarity or conductivity type ion exchange groups, can preferably used as the first ion-exchange membrane of the second embodiment.
[0026] The iontophoresis device according to the second embodiment of the present invention can be manufactured through such a simple manufacturing process that interposes an ion-exchange membrane easily available on the market etc. between the drug holding part and the substrate of the skin contact member.
Thus an advantage in terms of a lower manufacturing cost can be obtained.
[0027] According to the third embodiment of the present invention, the above mentioned problems are solved by an iontophoresis device having a working electrode structure, said working electrode structure comprising:
a first electrode;
a skin contact member including a substrate having a front surface and a rear surface, and a plurality of columnar members embedded in the substrate and made of an ion-exchange resin introduced with a second polarity or conductivity type ion exchange groups; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
each of the columnar members is exposed to the rear surface of the substrate at one end and protrudes by a predetermined length from the front surface of the substrate at the other end to form a needle-like member puncturable into the skin.
[0028] According to the third embodiment of the present invention, the columnar member made of an ion-exchange resin has the functions as both the needle-like member puncturable into the skin and the member that allows selective passage of the ions of the first conductivity type, thereby attaining the operational effect as those of the first or second embodiments.
[0029] That is, the drug ions in the drug holding part are delivered into the living body through the columnar members by the application of the first-conductivity-type voltage to the first electrode delivers. Further, the columnar members are formed of an ion-exchange resin introduced with an ion-exchange group whose counter ion is the first conductivity type, whereby backflow of the biological counter ion to the drug holding part through the columnar members is prevented. As a result, it is possible to improve drug ion delivery efficiency or speed, or to further lower current or voltage conditions for the drug delivery, or deliver even drug ions containing macromolecules such as protein or peptide molecules under lower current or voltage conditions with higher efficiency or speed, as in the first or second embodiment.
[0030] The resins described for the first embodiment can be used as the ion-exchange resin introduced with the second polarity or conductivity type ion exchange groups, for forming the columnar members of the third embodiment. Examples of a method of forming the ion-exchange resin into a columnar shape includes a method of molding hydrocarbon-based resins or a fluororesin forming the ion-exchange membrane into a linear shape through extrusion-molding, and then cutting the resultant into a predetermined size.
[0031] Note that the sectional shape of the columnar member may be arbitrarily set, for example, as a circle or rectangle. The length of the columnar member is preferably 1 to 3,000 .im, more preferably, 10 um to 500 pm. The diameter of the columnar member is preferably 0.03 to 300 pm, more preferably, 0.1 pm to 100 pm.
Further, the length of the needle made up of the columnar member (protrusion length of the columnar member from the front surface of the substrate) is preferably 1,000 pm or shorter, more preferably 1 pm to 300 pm.
[0032] According to the fourth embodiment of the present invention, the above mentioned problems are solved by an iontophoresis device having a working electrode structure, said working electrode structure comprising:
a first electrode;

a skin contact member including a substrate having a front surface and a rear surface, and a multi-needle member having a plurality of needle-like projections radially protruding therefrom and made of an ion-exchange resin introduced with a second polarity or conductivity type ion exchange groups; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
at least a part of a surface of the multi-needle member is exposed to the rear surface of the substrate, and any one or more of the needle-like projections of the multi-needle member protrudes by a predetermined length from the front surface of the substrate to form a needle puncturable into the skin.
[0033] In this fourth embodiment of the present invention, the same effect as in the first to third embodiments can be attained by the fact that the multi-needle member made of an ion-exchange resin have both the function as the needle being able to be punctured into skin and the function of the member for selectively passing the first ions.
[0034] That is, the drug ions in the drug holding part are delivered into the living body through the multi-needle member by the application of the first-conductivity-type voltage to the first electrode. Further, since, the multi-needle member is formed of an ion-exchange resin introduced with a second polarity or conductivity type ion exchange groups, the ion exchange groups prevent backflow of biological counter ions from the living body to the drug holding part. As a result, it is possible to improve drug ion delivery efficiency or speed, or to further ease current or voltage conditions for the drug delivery, or deliver even drug ions containing macromolecules such as protein or peptide molecules under lower current or voltage conditions with higher efficiency or speed.
[0035] The resins described for the first embodiment can be used as the ion-exchange resin introduced with a second polarity or conductivity type ion exchange groups, for forming the multi-needle member of the fourth embodiment.
[0036] The needle-like projection of the multi-needle of the fourth embodiment is preferably formed into the length of 1,000 pm or shorter, more preferably 1 pm to 300 pm through micromachining, for example.
[0037] According to the fifth embodiment of the present invention, the above mentioned problems are solved by an iontophoresis device having a working electrode structure, said working electrode structure comprising:
a first electrode;
a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin, the skin contact member being formed of an ion-exchange membrane allowing selective passage of ions of a first conductivity type; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate.
[0038] In this fifth embodiment, as in the third or fourth embodiment, drug ions in the drug holdi.ng part are delivered into the skin through the needle-like members by the application of the first-conductivity-type voltage to the first electrode. Further, the skin contact member is formed of the ion-exchange membrane allowing selective passage of the ions of the first conductivity type, so the backflow of the biological counter ion into the drug holding part is blocked or suppressed. Therefore, it is possible to improve drug ion delivery efficiency or speed, or to further ease current or voltage conditions for the drug delivery, or deliver even drug ions containing macromolecules such as protein or peptide molecules under lower current or voltage conditions with higher efficiency or speed as in any of the first to fourth embodiments.
[0039] Here, the ion-exchange membrane of the fifth embodiment may be made of the materials described for the second embodiment.
The needle-like members may be formed on the front surface of the ion-exchange membrane by press molding the substrate constituting the ion-exchange membrane, for example.
[0040] In theiontophoresis device accordingto thethirdtofifth embodiments of the present invention, the holes are preferably formed in the columnar members, the multi-needle member, or the needle-like members, the holes communicating with the opening at the rear surface of the substrate, whereby the drug ion delivery speed or efficiency can further be enhanced.
[0041] In the iontophoresis device according to the first --ofifth embodiments of the present invention, the working electrode structure may further include: a first electrolyte holding part for holding an electrolyte that is in contact with the first electrode; and a second ion-exchange membrane that is interposed between the first electrolyte holding part and the drug holding part and allows selective permeation of ions of a second conductivity type. With this arrangement, it is possible to avoid ion decomposition of the drug ions around the first electrode, transference of H+ ions or 0H ions generated at the first electrode to the drug holding part, or resultant fluctuation in a pH value at the drug holding part and in turn, at the interface between the skin and the skin contact member, and inflammation caused on the skin contacting the skin contact member in some cases, and to achieve more stable, safe drug delivery.
[0042] The iontophoresis device of the first to fifth embodiments of the present invention may further include a nonworking electrode structure comprising: a second electrode; a second eiectrolyte holding part that is in contact with the second electrode; a third ion-exchange membrane that is arranged on a front side of the second electrolyte holding part and allows selective passage of the ions of the first conductivity type; a third electrolyte holding part that is arranged on a front side of the third ion-exchange membrane and holds an electrolyte; and a fourth ion-exchange membrane that is arranged on a front side of the third ion-exchange membrane and allows selective passage of ions of a second conductivity type. With this arrangement, it is possible to avoid fluctuation in a pH value at the interface between the skin and the nonworking electrode structure, and inflammation caused on the skin contacting the nonworking electrode structure in some cases, and to achieve more stable, safe drug delivery.

BREIF DESCRIPTION OF THE DRAWINGS
[0093] [FIG. I] Fig.l illustrates a structure of an iontophoresis device according to an embodiment of the present invention.
[FIG. 2] FIG. 2(a) illustrates a embodiment of a skin contact member used in the iontophoresis device according to the present invention, and FIG. 2(b) illustrates how ions migrate in the iontophoresis device according to the present invention.
[FIG. 3] FIGS. 3(a) to (g) each illustrates another embodiment of the skin contact member.
[FIG. 4] FIG. 4 illustrates an example of a manufacturing method for a skin contact member.
[FIG. 5] FIG. 5 illustrates a structure of an iontophoresis device according to another embodiment of the present invention.
[FIG. 6] FIG. 6 illustrates an example of a conventional iontophoresis device.

BEST MODE FOR CARRYING OUT THE INVENTION
[0044] Hereinafter, embodiments of the present invention will be described.
[0045] As a matter of practical convenience for explanation, description is given of an embodiment of an iontophoresis device for delivering drugs whose active ingredients dissociate into positive drug ions (for example, lidocaine hydrochloride as an anesthetic, carnitine chloride as a remedy for gastrointestinal disorder, pancuronium bromide as muscle relaxants, and morphine hydrochloride as an anesthetic) by way of example. However, as regards an iontophoresis device for delivering drugs whose active ingredients dissociate into negative drug ions (for example, ascorbic acids as vitamins, and Lipid A used as a vaccine adjuvant) the polarity (plus or minus) of the electrodes of the power source and the ion-exchange group introduced to the ion-exchange membrane or the ion-exchange resin has only to be reversed. In addition, proteins and peptides are amphoteric electrolytes, which are dissociable into either cations or anions depending on pH of a drug solution. Thus, either one of the two is used depending on pH.
[0046] FIG. 1 is a schematic sectional diagram showing a basic structure of an iontophoresis device 1 according to the present invention.
[0047] As illustrated in FIG. 1, the iontophoresis device 1 of the present invention includes a working electrode structure 10, and a nonworking electrode structure 20, a power source 30 as main components (members).
[0048] The working electrode structure 10 includes: an electrode member 11 connected with a positive electrode of the power source 30; a drug holding part 14 that holds a drug solution that is in contact with the electrode member 11 and applied with voltage through the electrode member 11; a skin contact member 15 arranged on a front side of the drug holding part 14; and a cover or container 16 that houses those members.
[0049] The nonworking electrode structure 20 includes: an electrode member 21 connected with a negative electrode of the power source 30; an electrolyte holding part 22 that holds an electrolyte that is in contact with the electrode member 21 and applied with voltage through the electrode member 21 and a cover or container 26 that houses those members.
[0050] As the electrode members 11 and 21, electrodes made of any conductive materials can be used with no particular limitations, and it is particularly preferable to use an active electrode such as silver/silver halide coupled electrode, which can suppress electrolytically-generated H+ ions and 0H- ions from water.
[0051] The drug holding part 14 holds an aqueous solution of a drug whose active ingredients dissociate into cations when dissolved (for example, proteins and peptides having positive charges in total in the solution, lidocaine, carnitine crloride, pancuronium bromide, and morphine hydrochloride) as a drug solution.
[0052] The electrolyte holding part 22 holds an electrolyte that enables current to flow. As the electrolyte, a phosphate buffered saline or physiological saline can be used. Alternatively, it is possible to use an electrolyte susceptible to oxidation or reduction (oxidation at the positive electrode and reduction at the negative electrode) as compared with an electrolytic reaction of water, examples of which include: inorganic compounds such as ferrous sulfate and ferric sulfate; agents such as an ascorbic acid (vitamin C) and sodium ascorbate; organic acids such as a lactic acid, an oxalic acid, a malic acid, a succinic acid, and fumaric acid and/or salts thereof; and mixtures thereof. The use thereof makes it possible to avoid fluctuation in pH value or gas generation due to the electrolytic reaction of water, and any resulting increase in ion conduction resistance.
[0053] The drug holding part 14 and the electrolyte holding part 22 may respectively retain the drug solution and electrolyte in a liquid form, or retain the drug solution and electrolyte in the form of being impregnated into a carrier made of any material having a water retentivity such as a fibrous sheet such as gauze or filter paper, or a polymer gel sheet made of an acrylic resin hydrogel (acrylic hydrogel) or segmented polyurethane-based gel.
This facilitates, for example, handling thereof.
[0054] In this case, the impregnation rate of the drug solution or electrolyte into the carrier needs to be set to such a value as to ensure sufficient current supply and high transport rate.
The impregnation rate of the drug solution is set to 20 to 60% for the drug holding part 14, whereby a transport rate (drug delivering property) as high as 70 to 80% can be attained, for example.
[0055] Note that the impregnation rate is represented by weight percent, and derived from the expression of 100 x (W-D)/D (%), wherein said D represents a pre-impregnation (dry) weight and W
represents a post-impregnation (wet) weight. The transport rate indicates a ratio of current used for drug ion delivery to total current supplied to the working electrode structure.
[0056] FIG. 2(a) is a conceptual explanatory diagram showing a detailed structure of the skin contact member 15 in the iontophoresis device 1.
[0057] As illustrated in FIG. 2(a), the skin contact member 15 includes a substrate 51 having a front surface 51a and a rear surface 51b, and needle-like members 52 each protruding from the front surface 51a and having a size, shape, and strength enough for the puncture into the skin. In each needle-like member 52 has a hole 53 communicating between an opening 53a at the tip end of the needle-like member and an opening 53b at the rear surface of the substrate.
[0058] As a method of manufacturing the skin contact member 15, there are a variety of known manufacturing methods. For example, the skin contact member can be manufactured by molding organic materials, such as plastics in line with the method disclosed in US 6256533 or by etching inorganic materials such as silicon in line with the method disclosed in JP 2005-503194 A.
[0059] Here, the length (LN) of each of the needle-like members 52 of the skin contact member 15 is set to 1,000 pm or shorter, preferably, 1 um to 300 um. Hence, it is possible to relieve pains on a patient at the time of delivering a drug. In addit--on, the length (LK) of each of the holes 53 extending from the opening 53a at the tip end of the needle-like members to the opening 53b at the rear surface of the substrate is set to 1 to 3, 000 pm, preferably, pm to 500 pm. The inner diameter of each of the holes 53 is set to 0.03 pm to 300 pm, preferably, 0.1 pm to 100 pm. Hence, it is possible to secure a flow path large enough for smooth delivery of drug ions. The needle-like members 52 or holes 53 of the skin contact member 15 may be formed at the density of several to 5,000 (holes or needle-like members)/cmG, for example.

[0060] Note that each of the needle-like members 52 and/or the holes 53 may have any sectional shape such as a circular shape, an elliptical shape, or a rectangular shape. Besides, they may be formed into such a shape that has a uniform sectional area in a longitudinal direction of the needle-like members 52 as shown in FIG. 2(a) or a tapered shape as shown in FIG. 6, which facilitates insertion into the skin.
[0061] In addition, a cation-exchange resin (ion-exchange resin introduced with an anion group) 54 fills the inside of the holes 53 of the needle-like members 52.
[0062] As the above cation-exchange resin 54, usable is a resin prepared by introducing a cation-exchange group such as a sulfonic group, a carboxylic group, or a phosphonic group into a polymer substrate having a three-dimensional network structure such as hydrocarbon-based resins such as a polystyrene resin or acrylic acid resin or fluororesin-based resins having a perfluorocarbon backbone.
[0063] The holes 53 may be filled with the cation-exchange resin 54 by using any method, for example, by soaking the tip ends of the needle-like members 52 or the entire skin contact member 15 in a solution prepared by mixing a cross-linking monomer forming the polymer substrate such as styrene-divinylbenzene or chloromethylstyrene-divinylbenzene with a polymerization initiator; by charging the solution from the rear surface 51b of the substrate 51 using a spatula member so that the solution is infiltrated or impregnated into the holes 53, followed by polymerization and then introduction of the cation-exchange group; or by infiltrating or impregnating into the holes 53, a binder polymer such as a phenol resin or methyl methacrylate into which a fine powder of a cation-exchange resin is dispersed, in place of the above solution in the above way, and then curing the resultant binder polymer.
[0064] The cation-exchange resin 54 can be filled to the full length of the holes 53 as shown in FIG. 2(a) , or may be partially filled, for example, filled into only a portion of the holes 53 around the openings 53a at the tip ends of the needle-like members 52.
[0065] FIG. 2(b) schematically illustrates how ions deliver in the drug holding part 14 and a skin 40 when the voltage is applied through the electrode member 11 (and electrode member 21) with the skin contact member 15 brought into contact with the skin 40. In FIG. 2(b), D+ represents a positively charged drug ion, D
represents a counter ion thereof (drug counter ion) , and B
represents a negative ion in the living body (or at the surface of the skin 40) . In addition, reference numerals 41 and 42 denote a stratum corneum covering the skin surface and a subcutaneous tissue underlying the stratum corneum, respectively.
[0066] The drug ions D+ in the drug holding part 14 are driven through the application of a positive voltage to the electrode member 11, and delivered to the skin 40 through the holes 53. At this time, the drug ions D+ can pass through the cation-exchange resin 54 filled in the holes 53 because of its positive polarity.
[0067] In addition, the punctured needle-like members 52 penetrate the stratum corneum 41 which is a barrier against the delivery of the drug ions D', so the drug ions D+ having reached the opening 53a can be delivered into the subcutaneous tissue 42 without being blocked by the stratum corneum 41. Note that it is most preferable that all the needle-like members 52 completely penetrate the stratum corneum 41 like the illustrated example, but the drug delivery may be performed while all or some of the needle-like members 52 are halfway punctured into the stratum corneum 41. In this case as well, the drug delivery efficiency can be improved according as the thickness of the stratum corneum 41 from the opening 53a to the subcutaneous tissue 42 is reduced.
[0068] In contrast, the biological counter ions B present in the living body (or at the surface of the skin) are moved to the drug holding part 14 side through the application of a positive voltage to the electrode member 11, but the movement of the biological counter ion B- is completely blocked or suppressed to an allowable level owing to the cation-exchange resin 54 filled in the holes 53.
[0069] Accordingly, a ratio of current consumed for the movement of the biological counter ion B to the drug holding part 14 to total current supplied to the electrode member 11 is reduced or minimized substantially to zero, which increases a ratio of current consumable for the delivery of the drug ions D' to the living body. As a result, delivery speed and efficiency of the drug ions D+ improve, or the drug ions D+ can be delivered efficiency under lower current or voltage conditions.
[00'70] Note that the ion mobility tends to reduce in reverse proportion to its molecular weight. Hence, when the cation-exchange resin 54 does not fill the hole 53, the biological counter ion B_ consumes more current upon movement to the drug holding part 14 in the case of delivering the drug ion D' having a higher molecular weight. Therefore, an effect of improving the drug ion delivery speed and efficiency of the present invention can be greatly exerted in the case of using a drug ion of a higher molecular weight, which was hardly delivered with the conventional iontophoresis device.
[0071] A battery, a constant voltage generator, a constant current source, a constant voltage/current source, and the like can be used as the power source 30 in the iontophoresis device of the present invention. It is preferable to use a constant current source operable under stable voltage conditions that enable arbitrary current adjustment in a range of 0.01 to 1.0 mA/cm2, preferably 0.01 to 0.5 mA/cm2, more specifically, voltage conditions of 50 V or lower, preferably 30 V or lower.
[0072] In the above described iontophoresis device, a liner may be attached to the front side of the skin contact member 1.5 and/or the electrolyte holding part 22 for the purpose of preverting the drug holding part 14 or the electrolyte holding part 22 from drying or preventing foreign substances from mixing into the drug holding part 14 or the electrolyte holding part 22, or an adhesive layer for improving adhesion between the working electrode structure 10 and/or the nonworking electrode structure 20, and the skin may be laminated on a bottom "b" of the cover or container 16 and/or the cover or container 26.
[0073] FIG. 3(a) to 3(g) illustrate structures of skin contact members 15a to 15g as other embodiments of the skin contact member 15, each of which can replace the skin contact member 15.
[0074] The skin contact member 15a of FIG. 3(a) has the substrate 51, the needle-like members 52, and the holes 53 as in the skin contact member 15. However, instead of filling the cation-exchange resin 54 into the holes 53, a cation-exchange membrane (ion-exchange membrane allowing selective passage of cations) 55 is provided on the rear side of the substrate 51 and the front side of the drug holding part 14.
[0075] With an iontophoresis device using the above skin contact member 15a, the drug ions D+ pass through the cation-exchange membrane 55 and the holes 53, and are then delivered into the living body through the opening at the tip end of the needle 52 due to the voltage applied to the electrode member 11 as in the iontophoresis device 1.
[0076] In contrast, the cation-exchange membrane 55 blocks or suppresses the migration of the biological counter ion B_ to the drug holding part 14, so the biological counter ions B- are accumulated in the hole 53, and migration is substantially inhibited.
[0077] Accordingly, a larger amount of supplied current can be used for delivery of the drug ions D+ into the living body, improving the delivery speed and efficiency of the drug ions D`
or enabling the drug delivery under lower current or voltage conditions.
[0078] Note that as the cation-exchange membrane 55 used herein, any cation-exchange membrane having a function of allowing selective passage of cations can be used, examples of which include NEOSEPTA CM-l, CM-2, CMX, CMS, and CMB (available from Tokuyama Co., Ltd.). Particularlypreferable is a cation-exchangemembrane prepared by completely or partially filling a cation-exchange resin into pores of a porous film made of a polyolefin resin, vinylchloride-based resins, fluororesin-based resins, a polyamide resin, a polyimide resin, or the like. The cation-exchange resin may be filled by, for example, impregnating into the pores of the porous film, a solution prepared by mixing a cross-linking monomer such as styrene-divinylbenzene or chloromethylstyrene-divinylbenzene with a polymerization initiator, followed by polymerization, and then introducing cation-exchange groups such as a sulfonic group, a carboxylic group, and a phosphonic group into the polymer.
[0079] In addition, it is preferable to bond the cation-exchange merribrane 55 and the substrate 51 at the interface by an appropriate method such as bonding by use of an adhesive or ultrasonic bonding.
This overcomes a problem in that a gap is left at the interface to increase the migration amount of the biological counter ion B-or bubbles are generated to lower the conductivity.
[0080] The skin contact member 15b of FIG. 3(b) includes: the substrate 51 as in the skin contact member 15; and a number of columnar members 52 embedded into the substrate 51 and made of a cation-exchange resin. Each columnar member 56 is exposed to the rear surface of the substrate 51 at one end, and protrudes by a predetermined length from the front surface of the substrate 51 at the other end to constitute the needle 52.
[0081] With respect to an iontophoresis device using the above skin contact member 15b, the drug ions D+ pass through the columnar member 56 to be delivered into the living body through the application of a positive voltage to the electrode member 11 similarly to the iontophoresis device 1. Further, the cation-exchange resin forming the columnar member 56 blocks or suppresses migration of the biological counter ion B- to the drug holding part 14, so a larger amount of supplied current cari be used for derivery of the drug ions D+ into the living body, improving the delivery speed or efficiency of the drug ions D+ or enabling the drug delivery under lower current or voltage conditions.
[0082] The described the cation-exchange resin 54 of the skin contact member 15 can be used as the cation-exchange resin forming the columnar member 56. The columnar member can be formed into a columnar shape through machining such as micromachining or through extrusion-molding of hydrocarbon-based resins or a fluororesin forming the cation-exchange resin into a linear shape, followed by cutting into a predetermined length with the cation-exchange groups being introduced before or after the cutting.
[0083] Regarding the size of the columnar member 56, the length (LK) of the columnar member 56 is set, for example, to 1 to 3,000 um, preferably, 10 pm to 500 pm. If the columnar member 56 is circular in section, its diameter may be set, for example, to 0.03 to 300 pm, preferably, 0.1 pm to 100 pm. Further, in embedding the columnar member into the substrate 51, the protrusiori length (LN) from the front surface of the substrate 51 is preferably set, for example, to 1,000 pm or less, more preferably 1 pm to 300 pm.
[0084] Note that the sectional shape of the columnar member 56 is not limited to a circle but may be any shape such as an ellipse or rectangle. In addition, the member can be tapered towards its tip end to facilitate the puncture to the skin.
[0085] The skin contact member 15c of FIG. 3(c) has the same structure as the skin contact member 15b except that recesses 56a are formed in the columnar member 56 to open at the rear surface of the substrate 51.
[0086] Accordingly, with an iontophoresis device using the skin contact member 15c, the drug ions D+ are delivered in the same way as in the case of using the skin contact member 15b. However, the drug solution from the drug holding part 14 can be infiltrated into the recesses 56a, making it possible to deliver drug ions with higher efficiency than the case of using the skin contact member 15b.
[0087] Note that the recesses 56a can be formed through machining such as micromachining of the columnar member 56 manufactured by the above method.
[0088] The skin contact member 15d of FIG. 3(d) includes: the substrate 51 as in the skin contact member 15; and a plural multi-needle members 57 embedded into the substrate 51 and made of a cation-exchange resin. As shown in FIG. 3(d), the multi-needle members 57 each have plural needle-like projections that radially protrude. Any of the needle-like projections protrude from the front surface of the substrate 51 and serve as the needle-like members 52. Further, the multi-needle members 57 are embedded into the substrate 51 in such a form that at least a part thereof is exposed to the rear surface of the substrate 51.
[0089] A resin similar to that for the columnar members 56 can be used as the cation-exchange resin of the multi-needle members 57. The multi-needle members 57 can be shaped through micromachining or the like.
[0090] With respect to an iontophoresis device using the above skin contact member 15d, the drug ions D+ pass through the multi-needle members 57, and are then delivered into the living body due to the positive voltage applied to the electrode member 11 as in the iontophoresis device 1. Further, the cation-exchange resin forming the multi-needle members 57 blocks or suppresses migration of the biological counter ion B- to the drug holding part 14. Accordingly, a larger amount of supplied current can be used for delivery of the drug ions D+ into the living body, improving the delivery speed or efficiency of the drug ions D+ or enabling the drug delivery under lower current or voltage conditions.
[0091] Note that the skin contact member 15d is advantageous in that a manufacturing process can be simplified as compared with the skin contact member l5b because the multi-needle menibers 57 havi.ng an appropriate number of needle-like projections with an appropriate length enables any of the needle-like projections to protrude to the front surface 51a of the substrate 51 even when embedded into the substrate 51 regardless of an embedding direction (orientation) of the multi-needle members, and enables at least a part of the multi-needle members 57 to be exposed to the rear surface 51b of the substrate 51.
[0092] The skin contact member 15e of FIG. 3(e) has the same structure as the skin contact member 15d except that recesses 57a are formed in the substrate 51 and the multi-needle members 57 to open on the rear surface 51b of the substrate 51.
[0093] Accordingly, in the iontophoresis device using the skin contact member 15e, the drug ion delivery is carried out in a way similar to that using the skin contact member 15d. However, the drug solution from the drug holding part 14 can be infiltrated into the recesses 57a, whereby the drug ion can be delivered with higher efficiency than that in the case of using the skin contact member 15d.
[0094] The recesses 57a can be formed through micromachining or the like.
[0095] The skin contact member 15f of FIG. 3(f) includes: the substrate 51; and the needle-like members 52 protruding from the front surface of the substrate 51, and the skin contact member 15f is made up of a cation-exchange membrane in its entirety.
[0096] The above skin contact member 15f can be molded by using molds 61a and 62a as shown in FIG. 4(a), for example.
[0097] More specifically, a porous film 63 made of a thermoplastic resin such as a polyolefin resin, vinylchloride-based resins, fluororesin-based resins, a polyamide resin, or a polyimide resin is press-molded between the molds 61a and 62a. After that, a cation-exchange resin is filled into the pores of the porous film 63 based on the same manner as that for the cation-exchange membrane 55, or the porous film 63 whose pores are previously filled with the cation-exchange resin is press-molded between the molds 61a and 62a to thereby form the skin contact member 15f.
[0098] Alternatively, the above skin contact member 15f can be produced by molding a binder polymer such as polyethylene, polystyrene, a phenol resin, or methyl methacrylate into which a fine powder of a cation-exchange resin is dispersed, between the molds 61a and 62a into a membrane.
[0099] With respect to an iontophoresis device using the skin contact member 15f, the drug ions D+ pass through the skin contact member 15f, and are then delivered into the living body from the tip ends of the needle-like members 52 due to the positive voltage applied to the electrode member 11 as in the iontophoresis device 1. Further, the skin contact member 15f as a cation-exchange membrane blocks or suppresses migration of the biological counter ion B to the drug holding part 14 . Accordingly, a larger amount of supplied current can be used for delivery of the drug ions D+
into the living body, improving the delivery speed or efficiency of the drug ions D' or enabling the drug delivery under lower current or voltage conditions.
[0100] In addition, with respect to this iontophoresis device, the drug ions D+ can deliver into the living body from other portions than the needle-like members 52 of the substrate 51 in contact with the skin 40 albeit delivery by way of the stratum corneum 41. Thus, especially in the case where a drug ion having a relatively low molecular weight is used, or a drag ion a significant quantity of which can be delivered through the stratum corneum 41 is used, the drug delivery speed or efficiency can further be enhanced.
[0101] The skin contact member 15g of FIG. 3(g) has the same structure as the skin contact member 15f except that recesses 58 extend from the rear surface of the substrate 51 to the inside of the needle-like members 52 in the skin contact member 15g.
[0102] The skin contact member 15g can be molded using molds 61b and 62b as shown in FIG. 4(b) by the similar ways as those for the skin contact member 15f.
[0103] An iontophoresis device using the skin contact member 15g delivers drug ions in a similar way to that in the case the skin contact member 15f is used. However, the drug solution from the drug holding part 14 can be infiltrated into the recesses 58, whereby the drug ion can be delivered with a higher efficiency than that in the case of using the skin contact member 15g.
[0104] FIG. 5 illustrates a structure of an iontophoresis device 101 according to another embodiment of the present invention.
[0105] An iontophoresis device 101 of the present invention includes a working electrode structure 110, a nonworkingelectrode structure 120, and a power source 130 like the iontophoresis device 1.
[0106] The working electrode structure110 includes: an electrode member 111 connected with a positive electrode of the power source 130; an electrolyte holding part 112 that holds an electrolyte that is in contact with the electrode member 111 and is applied with voltage through the electrode member 111; an anion-exchange membrane 113 arranged on a front side of the electrolyte holding part 112; a drug holding part 114 that is placed on a front side of the anion-exchange membrane 113 and holds a drug solution that is applied with voltage from the electrode member 111 through the electrolyte holding part 112 and the anion-exchange membrane 113;
a skin contact member 115 arranged on a front side of the drug holding part 114; and a cover or container 116 that houses those members.
[0107] The nonworking electrode structure 120 includes: an electrode member 121 connected with a negative electrode of the power source 130; an electrolyte holding part 122 that holds an electrolyte that is in contact with the electrode member 121 and is applied with voltage through the electrode member 121; a cati.on- exchange membrane 123 arranged on a front side of the electrolyte holding part 122; an electrolyte holding part 124 that is placed on a front side of the cation-exchange membrane 123 and holds an electrolyte that is applied with voltage from the electrode member 121 through the electrolyte holding part 122 and the cation-exchange membrane 123; an anion-exchange membrane 125 arranged on a front side of the electrolyte holding part 124; and a cover or container 126 that houses those members.

0108] Here, the electrode members 111 and 121, the drug holding part 114, and the electrolyte holding parts 112, 122, and 124 have the same structures as the electrode members 11 and 21, the drug holding part 14, and the electrolyte holding part 22, respectively, and membranes similar to the above-described membranes for the cation-exchange membrane 55 can be used for the cation-exchange membrane 123.
[0109] As the anion-exchange membranes 113 and 125, for example, any anion-exchange membrane having a function of allowing selective passage of anions can be used, examples of which include NEOSEPTA AM-1, AM-3, AMX, AHA, ACH, and ACS (available from Tokuyama Co., Ltd.). Particularly preferable is an anion-exchange membrane prepared by filling an anion-exchange resin into pores of a porous film similar to that for the cation-exchange inembrane 55. In this case, the anion-exchange resin may be filled by, for example, impregnating into the pores of the porous film, a solution prepared by mixing a cross-linking monomer such as styrene-divinylbenzene or chloromethylstyrene-divinylbenzene with a polymerization initiator, followed by polymerization and then introduction of anion-exchange groups to the polymer.
[0110] Further, usable as the skin contact member 115 are members similar to the skin contact member 15 or the skin contact members 15a to 15f.
[0111] The iontophoresis device 101 achieves an operational effect equivalent to the above effect of the iontophoresis device 1 or the devices replacing the skin contact member 15 of the iontophoresis device 1 with any of the skin contact members 15a to 15f, and further attains the following additional operational effect.
[0112] That is, the anion-exchange membrane 1.13 or cation-exchange membrane 123 blocks or suppresses migration of H+
ions or 0H- ions generated at the electrode members 11l and 121 due to the voltage application from the electrode members 111 and 121 to the drug holding part 114 and the electrolyte holding part 124 . Thus, it is possible to suppress fluctuation in pH value in the drug holding part 114 and the electrolyte holding part 124 and in turn, at the contact surfaces of the working electrode structure 110 and the nonworking electrode structure 120 to the skin. As a result, damage to the skin is reduced to enhance a safety level of the drug delivery.
[0113] Further, as discussed above, the migration of H' or OH ions to the drug holding part 114 and the electrolyte holding part 124 is blocked or suppressed, whereby a carbon electrode as an inactive electrode can be used for the electrode members 111 and 121 i_n place of the active electrode such as a silver/silver halide coupled electrode. Consequently, it is possible to attain an iontophoresis device without a problem where metal ions eluting from the electrode migrate into the living body, causing damage to health.

[0114] Further, the drug holding part 114 is separated from the electrode member 111 by the anion-exchange membrane 113, which prevents a problem in that ion decomposition of drug ions takes place around the electrode member 111 to generate any hazardous substance.
[0115] The present invention has been described so far based on several embodiments. Thepresent invention is not limitedtothose embodiments but allows any addition, change, and deletion of the components in the embodiments within the scope of claims.

Claims (10)

  1. [1] An iontophoresis device having a working electrode structure, said working electrode structure comprising:
    a first electrode;
    a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
    a hole communicating between a tip end of each of the needle-like members and the rear surface of the substrate is formed in the needle-like members, and the hole of the needle is filled with an ion-exchange resin introduced with an ion-exchange group whose counter ion is the first conductivity type.
  2. [2] An iontophoresis device having a working electrode structure, said working electrode structure comprising:
    a first electrode;
    a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
    a hole communicating between a tip end of each of the needle-like members andthe rear surface of the substrate is formed in the needle-like members, and the skin contact member further includes a first ion-exchange membrane that is interposed between the drug holding part and the substrate and allows selective permeation of the ions of the first conductivity type.
  3. [3] An iontophoresis device having a working electrode structure, said working electrode structure comprising:
    a first electrode;
    a skin contact member including a substrate having a front surface and a rear surface, and a plurality of columnar members embedded in the substrate and made of an ion-exchange resin introduced with an ion-exchange group whose counter ion is the first conductivity type; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
    each of the columnar members is exposed to the rear surface of the substrate at one end and protrudes by a predetermined length from the front surface of the substrate at the other end to form a needle puncturable into the skin.
  4. [4] An iontophoresis device according to claim 3, wherein a hole is formed inside the columnar member to communicate with an opening formed at the rear surface of the substrate.
  5. [5] An iontophoresis device having a working electrode structure, said working electrode structure comprising:
    a first electrode;
    a skin contact member including a substrate having a front surface and a rear surface, and a plurality of multi-needle members having a plurality of needle-like projections radially protruding therefrom and made of an ion-exchange resin introduced with an ion-exchange group whose counter ion is the first conductivity type; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate, wherein:
    at least a part of a surface of the multi-needle member is exposed to the rear surface of the substrate, and any one or more of the needle-like projections of the multi-needle member protrudes by a predetermined length from the front surface of the substrate to form a needle puncturable into the skin.
  6. [6] An iontophoresis device according to claim 5, wherein a hole is formed in the multi-needle member to communicate with an opening formed at the rear surface of the substrate.
  7. [7] An iontophoresis device having a working electrode structure, said working electrode structure comprising:
    a first electrode;
    a skin contact member including a substrate having a front surface and a rear surface, and a plurality of needle-like members that protrude from the front surface of the substrate and can be punctured into skin, the skin contact member being formed of an ion-exchange membrane allowing selective permeation of ions of a first conductivity type; and a drug holding part applied with voltage through the first electrode and holding a drug solution containing drug ions charged in the first conductivity type, the drug holding part being arranged on the rear side of the substrate.
  8. [8] An iontophoresis device according to claim 7, wherein holes are formed in the skin contact member, each of the holes extending from an inner portion of each of the needle-like members to an opening at the rear surface of the substrate.
  9. [9] An iontophoresis device according to any one of claims 1 to 8, wherein the working electrode structure further includes:
    a first electrolyte holding part for holding an electrolyte that is in contact with the first electrode; and a second ion-exchange membrane that is interposed between the first electrolyte holding part and the drug holding part and allows selective permeation of ions of a second conductivity type.
  10. [10] An iontophoresis device according to any one of claims 1 to 9, further comprising a nonworking electrode structure including:
    a second electrode;
    a second electrolyte holding part for holding an electrolyte that is in contact with the second electrode;
    a third ion-exchange membrane that is arranged on a front side of the second electrolyte holding part and allows selective permeation of the ions of the first conductivity type;
    a third electrolyte holding part that is arranged on a front side of the third ion-exchange membrane and holds an electrolyte;
    and a fourth ion-exchange membrane that is arranged on a front side of the third ion-exchange membrane and allows selective permeation of ions of a second conductivity type.
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