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Publication numberWO1998039040 A1
Publication typeApplication
Application numberPCT/US1997/003718
Publication date11 Sep 1998
Filing date7 Mar 1997
Priority date7 Mar 1997
Publication numberPCT/1997/3718, PCT/US/1997/003718, PCT/US/1997/03718, PCT/US/97/003718, PCT/US/97/03718, PCT/US1997/003718, PCT/US1997/03718, PCT/US1997003718, PCT/US199703718, PCT/US97/003718, PCT/US97/03718, PCT/US97003718, PCT/US9703718, WO 1998/039040 A1, WO 1998039040 A1, WO 1998039040A1, WO 9839040 A1, WO 9839040A1, WO-A1-1998039040, WO-A1-9839040, WO1998/039040A1, WO1998039040 A1, WO1998039040A1, WO9839040 A1, WO9839040A1
InventorsAthanasios D. Pratilas
ApplicantPratilas Athanasios D
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Curved intra venous/artery catheter (civac)
WO 1998039040 A1
Abstract
A catheter assembly comprising an inner catheter (1) comprising a perforating rigid hollow member (3) of uniform diameter having a straight section (1a) terminating in a standard hollow needle point (3a). The other end of the straight section gradually curves into a curved section (1b), terminating in a stop member and manipulating handle portion (2b). An outer catheter (8), snugly but slidingly fitted over the inner catheter, is comprised of a straight flexible tube (8a) conformed to the curvature of the inner catheter, and allowing the perforating needle point to be exposed for insertion into the patient. After catheter insertion, the inner catheter is removed leaving the outer tube in place for access to the vein or artery.
Claims  (OCR text may contain errors)
What is claimed is:
1. A catheter assembly for insertion into a blood vessel of a patient, said catheter assembly comprising an inner catheter element comprising a rigid, hollow tube of substantially uniform diameter having a straight section terminating in a needle point, said straight section having another end from which the hollow tube gradually curves into a curved section offset from the straight section by a degree sufficient to permit the curved section to be used as a handle to depress the straight section against a patient's skin with minimized impeding contact between the patient and a user of the catheter assembly; said catheter assembly further comprising an outer catheter element, which is adapted to be snugly but slidingly fitted over the inner catheter element, said outer catheter element being comprised of a flexible tube which conforms to the curvature of the inner catheter element when fitted thereon, and wherein said outer catheter element is of a length which allows the needle point to be exposed when the outer catheter element is fitted over the inner catheter element.
2. The catheter assembly of claim 1, wherein the curved section 0 of the inner catheter element terminates in a stop member, with said stop member being adapted to stop fitting placement of the outer catheter element on the inner catheter element therebeyond.
3. The catheter assembly of claim 2, wherein the outer catheter element comprises stop means which abuttingly engage said stop member 5 when the outer and inner catheter elements are fully fitted to each other.
4. The catheter assembly of claim 3, wherein the stop member does not impede external access to an interior of the rigid hollow tube .
5. The catheter assembly of claim 4, wherein the rigid hollow tube is further integrated with a hollow conical element extending from the stop member towards the needle point, with said conical element having a shape substantially the same as that of a syringe at its point of connection with a needle, and wherein the outer catheter element comprises a conical hollow adapted to fittingly engage the conical element of the inner catheter element .
6. A method for inserting the catheter of claim 1 into a blood vessel of a patient comprising the steps of: a) placing the straight section of the catheter against the patient's skin with alignment of the needle point with a desired insertion point into the patient; b) using the curved section of the catheter as a handle, to push the straight section down, with depression of the patient's skin and depression of the lead-in portion of a blood vessel into which the catheter is to be inserted; c) moving the catheter forward whereby the needle point pierces the skin and enters the blood vessel; and d) slidingly removing the inner catheter element from the outer catheter element, leaving the outer catheter tube in place in the blood vessel, for access thereto.
Description  (OCR text may contain errors)

CURVED INTRA VENOUS/ARTERY CATHETER (CIVAC)

FIELD OF THE INVENTION

This invention relates to catheters used in obtaining access to blood vessels and particularly to catheters used in restricted access areas of a patient's body.

BACKGROUND OF THE INVENTION

Catheters for obtaining access to a patient's veins or arteries, i.e., blood vessels, such as for iv infusion, for blood access, or for access to internal body sites for medical procedures, e.g., balloon catherization, are usually effected by deployment of a hollow needle catheter, with an access tube thereon, into a patient's blood vessel. The needle catheter, with an angled point, is inserted into the blood vessel and when it is certain that placement is complete, such as by testing with a syringe to see if blood can be drawn through the needle, the tube is pushed into the blood vessel and the needle is withdrawn, thereby leaving the access tube in position in the blood vessel. The access tube's exposed end is provided with coupling means for attachment to a fluid source (e.g., iv) or device which provides the requisite operation (access needle, probe, etc.) .

These catheters generally comprise straight needles which are manually inserted by parallel (or as close to parallel as possible) placement against a patient's skin and a thrust into the blood vessel. Problems arise with such catheters when this manner of placement is impeded as a result of the requisite position for the catheter placement being in a partially inaccessible area of the patient's body such as the neck. Improper placement, such as puncturing or penetration of a posterior instead of anterior wall of a blood vessel, resulting from inexperience or impeded placement sites, can result in hematoma or, in many instance, the blood vessel may actually be only tangentially or even entirely missed, with the necessity for numerous attempts at proper insertion. SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide an intra venous/artery catheter assembly with improved placement capability even in obstructed skin locations. It is a further object of the present invention to provide a method for a fully guided and supported catheter emplacement. -"

Generally the present invention comprises a catheter assembly comprised of inner and outer catheter elements. The inner catheter element comprises a rigid hollow member of uniform diameter having a straight section terminating at one end in a standard hollow needle point. In accordance with the present invention, the other end of the straight section gradually curves into a curved section, terminating in a stop member (with respect to cooperative engagement with the outer catheter element) and a manipulating handle portion, offset from the straight section. The degree of this offset is at least sufficient to permit the curved section to be used as a handle, to depress the straight section against a patient's skin, with minimized or without impeding contact between the patient and the user.

The outer catheter element which is snugly but slidingly fitted over the inner catheter element, is comprised of a flexible tube, preferably straight , which conforms to the curvature of the inner catheter, and is of a length allowing the needle point to be exposed for insertion into the patient. The curve of the inner catheter must be sufficiently gradual (and without sharp corners or other snagging shapes) such that inner catheter can be easily slidingly removed from the outer catheter without disturbing the placement of the outer catheter tube.

In use, the straight section of the catheter is placed against the patient's skin with alignment of the needle point with the desired insertion point into the patient. The curved section of the catheter is used to push the straight section down, with depression of the patient's skin (and depression of an adjacent lead-in portion of the blood vessel) whereby a forward movement of the catheter provides a guided insertion into the desired point. After full insertion of the catheter into the blood vessel, the inner catheter is slidingly removed, while leaving the outer tube (which re-assumes its normal straight configuration) in place for continued access to the blood vessel .

The above objects, features and advantages of the present invention will become more evident from the following discussion and drawings in which:

SHORT DESCRIPTION OF THE DRAWINGS

Figure 1 is an isometric view of the rigid, curved, inner catheter element of the present invention;

Figure 2 is an isometric view of the straight, flexible, outer catheter element of the present invention.

Figures 3a and 3b depict partially sectioned view of the catheter elements of Figures 1 and 2 fully and partially engaged with each other respectively;

Figures 4a-c sequentially show insertion of the catheter of Figures 3a and 3b into a vein in the back of a hand;

Figures 5a and 5b depict insertion of the catheter of the present invention in the limited access areas of the neck and foot of patients .

DETAILED DESCRIPTION OF THE INVENTION

The stop members of the inner and outer catheters are preferably radially extending and circular in configuration and cooperatively cofitting such that when fully abutted with each other the flexible outer tube extends to but does not cover the needle point of the curved, rigid inner catheter element, whereby the needle point is exposed for use. The inner flexible tube is adapted to be removably fitted on the rigid inner catheter element such that the stop member thereof does not impede removal of the inner rigid needle member after placement of the tube into a blood vessel . In a preferred embodiment, the stop member of the flexible tube is configured to accommodate a conical section extending from the stop member of the rigid, inner catheter element, which is preferably the same as that of a syringe tip which enters into the needle's coupling. As" a result, the inner tube is adapted to be fitted to a syringe with removal of the inner rigid catheter element .

DETAILED DESCRIPTION OF THE DRAWINGS

AND THE PREFERRED EMBODIMENT

With specific reference to the drawings, Figures 1 and 2 depict catheter inner and outer elements 1 and 8 respectively, which are engaged with each other to provide catheter assembly 10 shown in Figures 3a and 3b. Inner catheter element 1 is comprised of a rigid material such as metal and is configured as uniform diameter, open ended, hollow tube 3 which terminates at one end in angled needle tip 3a of standard configuration. Hollow tube 3 is comprised of straight segment la adjacent angled needle tip 3a. At a distance "d" from needle tip 3a, gradually curved segment lb continues away from needle tip 3a and terminates in segment lc which is in internal engagement with hollow cored conical fitting 2a (of a configuration similar to that of the engagement portion of a syringe with a needle) and stop collar 2b. Tube 3 extends through the stop collar 2b and is enclosed by open ended cylindrical member 2c, which permits syringe access to the interior of tube 3 to permit drawing of blood as an indication of proper catheter placement .

Straight flexible tube 8, with tube portion 8a and integrated collar section 8b, is adapted to snugly but slidingly fit over tube 3 of rigid member 1 and receive conical fitting 2a within collar section 8b until stop collar 2b and stop flange 8c come into abutting contact as shown in Figures 3a and 3b. Because of the flexibility of the material comprising tube 8, it assumes the curved configuration of the rigid member but re-assumes its straight configuration when the curved rigid inner element is removed. When the inner and outer catheter elements 1 and 8 are fully fitted together, tube 8 allows needle tip 3a to be exposed for use in placement of catheter 10, as illustratively shown in Figures 4a-c.

As shown in Figure 4a, catheter 10 is initially positioned such that straight section la is parallel to the skin surface of hand 30 and aligned with blood vessel 31 into which the catheter is to be placed. As shown in Figure 4b, straight section la is depressed onto the skin surface, with the sections lb and lc being manually grasped and manipulate as shown in Figure 4c. Blood vessel 31 is pushed down forming a small angle 31'. The catheter is then pushed forward into the blood vessel 31 at angle 31' and linearly enters the blood vessel 31 at the angle juncture. As indicated (depicting a start of a separation apart from the patient) in Figure 3b, tube 8 is pushed forward into the blood vessel and the rigid curved element 1 is removed from the tube to complete the tube placement. The tube 8 re- assumes its straight configuration for connection with an iv, or for whatever purpose the catheter is required.

Figures 5a and 5b depict use of the catheter 10 in a foot 50 and neck position respectively. It is specifically noted that the curvature of the catheter 10 allows it to be properly positioned in a blood vessel in neck 100 without being impeded by the patient's cheek or chin.

For various purposes and needs, the catheter and catheter elements of the present invention can be made in a variety of sizes and lengths. It is understood that the above description and drawings of a preferred embodiment are illustrative in nature and that changes in configuration, structure and components is possible without departing from the scope of the present invention as defined in the following claims .

Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US675885425 Jun 19996 Jul 2004St. Jude MedicalSplittable occlusion balloon sheath and process of use
Classifications
International ClassificationA61M25/00, A61M25/06
Cooperative ClassificationA61M25/0606, A61M25/0041
European ClassificationA61M25/00R2
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