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Publication numberUS3626949 A
Publication typeGrant
Publication date14 Dec 1971
Filing date23 Jan 1969
Priority date23 Jan 1969
Also published asCA924986A1
Publication numberUS 3626949 A, US 3626949A, US-A-3626949, US3626949 A, US3626949A
InventorsShute Wallace B
Original AssigneeShute Wallace B
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cervical dilator
US 3626949 A
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Description  (OCR text may contain errors)

United States Patent Inventor Wallace 8. Shute 340 McLeod St., Ottawa, Ontario, Canada Appl. No. 793,369 Filed Jan. 23, 1969 Patented Dec. 14, 1971 CERVICAL DILATOR 2 Claims, 2 Drawing Figs.

U.S. Cl 128/344, 128/361 Int. Cl ..A6lm 29/00,

A6 1 b 17/42 Field of Search 128/344, 349 B, 361; 206/D1G. 30

References Cited UNITED STATES PATENTS 9/1952 Edwards l28/349BUX Y Primary Examiner-Channing L. Pace AnorneyCushman, Darby & Cushman ABSTRACT: A cervical dilator comprising a fluidtight bag formed from a flexible material and insertable in a collapsed state into the cervical canal, inlet means in said bag for periodically introducing fluid under pressure to alternately inflate said bag whereby the wall of said bag radially expands to directly contact the walls of said canal and to deflate said bag so as to cause dilatation of the cervix and simulate effects of labor contraction, a portion of the wall of said bag intermediate the ends thereof being adapted to be more resistant to radial expansion whereby to form on inflation of said bag a constricted waist portion which accommodates the edges of the cervix.

CERVICAL DILATOR The present invention relates to a cervical dilator which is adapted to be inserted into the cervical canal and to cause upon inflation and deflation thereof dilation of the cervix so as to simulate the effect of labor contractions and thus hasten the processes of nature.

During labor, the cervix uteri dilates equally in all directions from a diameter of to centimeters under the pressure of intermittent uterine contractions transmitted through the presenting part (head, breech and/or forebag of water). This dilation permits passage of the baby from the uterine cavity through the pelvis to delivery. Nature however does not produce such labor pains in any regular or standard pattern, since the anatomical and physiological characteristics of all women vary, thus labor can be remarkedly eflicient and short or with noneffective contractions extremely protracted. The present invention provides a simple and relatively inexpensive device which will reproduce the effects of labor pains more efficiently and accurately regulating the dilation of the cervix from 0 to 10 centimeters with safety thus hastening the first stage of labor.

ln my Canadian application No. 958,955 I have disclosed and claimed such a cervical dilator which comprises a fluidtight container formed from a flexible material and insertable in a collapsed state into the cervical canal, inlet means in said container for intennittently introducing fluid under pressure to alternately inflate said container such that a peripheral radial wall of said container expands radially to directly contact the walls of said canal and deflate said bag so as to cause dilatation of the cervix and simulate the effects of labor contractions, the ends of the container being adapted to limit axial expansion of said container during inflation. in particular, in my copending Canadian application the ends of the container are adapted to substantially prevent axial expansion of the container on inflation thereof, essentially all the expansion of the container during the dilatation being in a radial direction as axial expansion of the container causes expansion of the container into the uterus of the pregnant women, thereby hindering to a substantial extent the delivery of the baby which is undesirable.

Further, the container has a waist portion intermediate the ends thereof and particularly equidistant from the ends thereof which waist portion is of reduced radial dimension for the location of the edges of a cervical os. This allows for the proper positioning of the cervical dilator in the cervical canal when used in simulating the effects of labor contraction.

It has now been found according to the present invention that by adapting the waist portion intermediate the ends of the container or bag so as to be more resistant to radial expansion than the remainder of the walls of the bag, on inflation of the bag the waist portion is constricted and thus at all times accommodates the edges of the cervical 0s and prevents the bag when under inflation from moving axially into or out of the uterus which is undesirable and thus allows only radial expansion and contraction of the walls of the bag' to take place.

According to the present invention therefore there is provided a cervical dilator comprising a fluidtight bag formed from a flexible material and insertable in a collapsed state into the cervical canal, inlet means in said bag for periodically introducing fluid under pressure to alternately inflate said bag whereby the wall of said bag radially expands to directly contact the walls of said canal and deflate said bag so as to cause dilatation of the cervix and simulate effects of labor contraction, a portion of the wall of said bag intermediate the ends thereof being adapted to be more resistant to radial expansion thereby to form on inflation of said bag a constricted waist portion which accommodates the edges of the cervix.

The bag which is suitable made of a relatively heavy gauge plastic material such as polyvinyl chloride suitably has embedded in the waist portion a relatively inextensible fiber such as cotton fiber which provides the necessary resistance to expansion of the waist portion which waist portion is suitably equidistant from the ends of the bag and thus on inflation of the bag the waist portion is constricted to accommodate the edges of the cervix.

As with the cervical dilator of my Canadian application No. 958,955 the ends of the bag are adapted to restrict axial expansion of the bag during inflation and desirably the ends of the bag allow substantially no axial expansion of the bag on inflation thereof.

Inflation and deflation of the bag may suitably be effected by periodically discharging fluid under pressure from a pressure means into said bag through the inlet means, the pressure means being suitably a hydraulic pressure means, the fluid being suitably water. Thus the present invention also provides in combination with the aforesaid cervical dilator of the present invention means for periodically discharging fluid under pressure into said bag through said inlet means to effect inflation or deflation thereof.

The present invention will be further illustrated by way of the accompanying drawings in which FIG. 1 is a perspective view of a deflated cervical dilator according to a preferred embodiment of the present invention, and

FIG. 2 is a similar view of the cervical dilator of FIG. 1 in the inflated state.

Referring to the accompanying drawings, the cervical dilator comprises a bag 1 formed from a flexible plastic material such as polyvinyl chloride sealed along the top and bottom edges thereof so that there is no appreciable axial expansion of the bag on inflation thereof and having an inlet 2 for the periodic introduction of water under pressure into the bag 1 to effect radial inflation and deflation thereof. The bag I has a waist portion 3 which has a continuous thread 4 embedded therein which restricts radial expansion of the waist portion 3 on inflation of the bag 1 (see HO. 2) thus providing accommodation for the edges of the cervix during expansion of the bag 1 and as such avoiding the tendency of the bag I to move axially with respect to the cervix during inflation thereof.

I claim:

1. A cervical dilator comprising a flattenable, closed end, tubular fluidtight bag formed from a flexible plastic material and insertable in a collapsed state into the cervical canal, inlet and outlet means in said bag for allowing intermittent introduction of fluid under pressure to alternately inflate said bag such that the peripheral tubular sidewall of said bag radially expands to directly contact the walls of said canal and deflate said bag so as to cause dilatation of the cervix and simulate effects of labor contraction, a portion of the peripheral wall of said bag intermediate the ends thereof including relatively inextensible reinforcing means which extend circumferentially of the peripheral wall in radially restraining engagement therewith so as to cause said portion of said peripheral wall to be more resistant to radial expansion than the remainder of said peripheral wall whereby to form on inflation of said bag a constricted waist portion having substantially the same girth when said bag is inflated as when said bag is in said collapsed state and which locates and retains the edges of the cervix when said bag is inflated, the ends of said bag defining substantially the extremities of said dilator and being reinforced by being folded transversely and sealed to limit axial expansion of said bag during inflation.

2. The cervical dilator of claim 1 wherein the bag peripheral wall is formed from polyvinyl chloride and relatively inextensible reinforcing means is a continuous textile thread imbedded in said portion of the peripheral wall.

i i l l

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2610626 *27 Jul 195116 Sep 1952Edwards John DSyringe
US2849002 *12 Mar 195626 Aug 1958Vincent J OddoHaemostatic catheter
US3480017 *5 Apr 196725 Nov 1969Shute Wallace BCervical dilator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3863639 *4 Apr 19744 Feb 1975Richard N KleavelandDisposable visceral retainer
US3900033 *7 Mar 197319 Aug 1975Ortho Pharma CorpDilator for cervical canal
US4018230 *2 Apr 197519 Apr 1977Kazuo OchiaiCervical dilator
US4083369 *2 Jul 197611 Apr 1978Manfred SinnreichSurgical instruments
US4137922 *21 May 19756 Feb 1979Ortho Pharmaceutical Corp.Dilator for cervical canal
US4602623 *30 Dec 198329 Jul 1986Michael CherkasskyMethod of delivering a fetus
US4984585 *26 Feb 199015 Jan 1991Austad Eric DTissue expander
US5309896 *19 Nov 199110 May 1994Origin Medsystems, Inc.Retraction methods using endoscopic inflatable retraction devices
US5402772 *13 Aug 19934 Apr 1995Origin Medsystems, Inc.Endoscopic expandable retraction device
US5425357 *8 Oct 199320 Jun 1995Origin Medsystems, Inc.For retracting an organ to gain access to treat a tissue
US5431173 *29 May 199211 Jul 1995Origin Medsystems, Inc.Removing gallbladder from an abdominal cavity
US5450843 *14 Mar 199419 Sep 1995Origin Medsystems, Inc.To gain access to an adjacent tissue
US5454367 *13 Aug 19933 Oct 1995Origin Medsystems, Inc.For retracting an organ inside the body
US5465711 *13 Aug 199314 Nov 1995Origin Medsystems, Inc.Method for retracting the bowel
US5501653 *6 Dec 199326 Mar 1996Origin Medsystems, Inc.Abdominal wall lifting retractor with hinged cross-member
US5520609 *18 May 199328 May 1996Origin Medsystems, Inc.Apparatus and method for peritoneal retraction
US5522790 *14 Mar 19944 Jun 1996Origin Medsystems, Inc.For retracting an organ inside the body to gain access to an adjacent tissue
US5527264 *8 Feb 199418 Jun 1996Origin Medsystem, Inc.For retracting an organ inside the body to provide access to treat tissue
US5531856 *13 Aug 19932 Jul 1996Origin Medsystems, Inc.Endoscopic inflatable retraction devices
US5562603 *5 Jun 19958 Oct 1996Origin Medsystems, Inc.Endoscopic inflatable retraction device with fluid-tight elastomeric window
US5575759 *1 Jun 199519 Nov 1996Origin Medsystems, Inc.Methods of using inflatable retraction devices in laparoscopic surgery
US5634883 *26 May 19953 Jun 1997Origin Medsystems, Inc.For lifting the abdominal wall for peritoneal retraction
US5643178 *26 May 19951 Jul 1997Origin Medsystems, Inc.Method for peritoneal retration
US5704372 *29 Jul 19946 Jan 1998Origin Medsystems, Inc.Method of providing access through the abdominal wall to repair a hernia
US5716327 *25 Jun 199610 Feb 1998Origin Medsystems, Inc.Body wall retraction system for wide cavity retraction
US5722986 *24 Jul 19963 Mar 1998Origin Medsystems, Inc.Inflatable devices for separating layers of tissue, and methods of using
US5728119 *13 Oct 199517 Mar 1998Origin Medsystems, Inc.Method and inflatable chamber apparatus for separating layers of tissue
US5738629 *5 Jun 199514 Apr 1998Origin Medsystems, Inc.Self-retracting endoscope
US5743850 *24 Aug 199428 Apr 1998Origin Medsystems, Inc.Endoscopic inflatable retraction device with additional inflatable chamber
US5743851 *4 Jun 199628 Apr 1998Origin Medsystems, Inc.For retracting an organ inside the body to gain access to an adjacent tissue
US5779728 *5 Jan 199614 Jul 1998Origin Medsystems, Inc.Method and inflatable chamber apparatus for separating layers of tissue
US5803901 *13 Mar 19978 Sep 1998Origin Medsystems, Inc.Inflatable devices for separating layers of tissue and methods of using
US5823945 *5 Jun 199720 Oct 1998Origin Medsystems, Inc.For retracting an organ inside the body to gain access to adjacent tissue
US5865728 *21 Nov 19952 Feb 1999Origin Medsystems, Inc.Method of using an endoscopic inflatable lifting apparatus to create an anatomic working space
US5925058 *18 Jun 199720 Jul 1999Origin Medsystems, Inc.Method and inflatable chamber apparatus for separating layers of tissue
US627713618 Feb 199921 Aug 2001General Surgical Innovations, Inc.Method for developing an anatomic space
US6358266 *9 Oct 199619 Mar 2002General Surgical Innovations, Inc.Active cannulas
US636154318 Mar 199726 Mar 2002Sherwood Services AgInflatable devices for separating layers of tissue, and methods of using
US642308313 Apr 199823 Jul 2002Kyphon Inc.Inflatable device for use in surgical protocol relating to fixation of bone
US660503726 Oct 199812 Aug 2003Sherwood Services AgEndoscopic inflatable retraction device
US664884215 Apr 199818 Nov 2003Wilhelm HorkelDelivery preparation and facilitation device and preparatory gymnastics
US666364722 Jul 200216 Dec 2003Kyphon Inc.Inflatable device for use in surgical protocol relating to fixation of bone
US68997194 Jan 200131 May 2005Kyphon Inc.Systems and methods for treating fractured or diseased bone using expandable bodies
US698198129 Dec 20033 Jan 2006Kyphon Inc.Inflatable device for use in surgical protocol relating to fixation of bone
US704495419 Jun 200116 May 2006Kyphon Inc.Method for treating a vertebral body
US73117198 Apr 200325 Dec 2007General Surgical Innovations, Inc.Active cannulas
US752760129 Dec 20055 May 2009Intrapartum Ventures, LlcCervimeter
US765497016 Jan 20082 Feb 2010Intrapartum, LlcCervical dilation measurement apparatus
US76823642 Mar 200623 Mar 2010Kyphon SarlMethod for treating a bone
US769548724 Apr 200313 Apr 2010General Surgical Innovations, Inc.Balloon dissection apparatus
US771321610 Apr 200611 May 2010Intrapartum, LlcMethod for cervical dilation and/or measurement
US774461719 Mar 200329 Jun 2010Covidien AgMethod and inflatable chamber apparatus for separating layers of tissue
US77491762 Apr 20086 Jul 2010Intrapartum, LlcCervical dilation measurement apparatus
US776682311 Aug 20033 Aug 2010Covidien AgEndoscopic inflatable retraction device, method of using, and method of making
US781123911 Apr 200612 Oct 2010Intrapartum, LlcCervical dilation measurement apparatus
US787903830 Oct 20071 Feb 2011Kyphon SarlApparatus, kits, and methods for creating cavities in cancellous bone using an elongated loop structure or bristles
US790982724 Apr 200722 Mar 2011Kyphon SarlSystems and methods for creating cavities in interior body regions
US795963825 Mar 200314 Jun 2011Kyphon SarlMethods and devices for treating bone after high velocity and/or trauma fracture
US796782727 Sep 200628 Jun 2011Kyphon SarlMethods and devices for treating fractured and/or diseased bone using an expandable structure that remains within the bone
US79678355 May 200328 Jun 2011Tyco Healthcare Group LpApparatus for use in fascial cleft surgery for opening an anatomic space
US804808715 Oct 20071 Nov 2011Tyco Healthcare Group LpApparatus for use in fascial cleft surgery for opening an anatomic space
US815281327 Sep 200610 Apr 2012Kyphon SarlMethods for treating fractured and/or diseased bone by introduction of different bone filling materials
US817286912 Apr 20108 May 2012Tyco Healthcare Group LpBalloon dissection apparatus
US822671727 Sep 200624 Jul 2012Kyphon SarlMethods and devices for treating fractured and/or diseased bone using an expandable stent structure
US824668129 Oct 200721 Aug 2012Kyphon SarlMethods for treating a fractured and/or diseased and/or weakened bone
US831786527 Sep 200627 Nov 2012Kyphon SarlMethods and devices for treating fractured and/or diseased bone using a mesh structure
US874743910 Jul 200610 Jun 2014P Tech, LlcMethod of using ultrasonic vibration to secure body tissue with fastening element
US88083293 Apr 201219 Aug 2014Bonutti Skeletal Innovations LlcApparatus and method for securing a portion of a body
DE2813215A1 *25 Mar 197827 Sep 1979Rolf ThomasVorrichtung zur einfuehrung eines mit luftdruck ausdehnbaren formkoerpers zur anpassung an menschliche und tierische hoehlungen
DE19715724A1 *15 Apr 199729 Oct 1998Wilhelm Dr Med HorkelVorrichtung zur Geburtsvorbereitung und Geburtserleichterung
DE19715724C2 *15 Apr 199721 Oct 1999Wilhelm HorkelVorrichtung zur Geburtsvorbereitung und Geburtserleichterung
WO1998046298A1 *15 Apr 199822 Oct 1998Horkel WilhelmDelivery preparation and facilitation device and preparatory gymnastics
Classifications
U.S. Classification606/193, 606/121, 606/119
International ClassificationA61M29/00
Cooperative ClassificationA61M29/02
European ClassificationA61M29/02