Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-08-21
1999-11-16
Coggins, Wynn Wood
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604247, A61M 500
Patent
active
059849037
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a catheter comprising a valve for controlling fluid (especially liquid) at its distal end by which it is inserted into a duct of a human or animal body, in order to control the distribution of fluid from the catheter into said duct or the removal of fluid from the duct.
In particular, the catheter of the invention is a vascular catheter adapted to be inserted into a vessel in such a manner that its distal end is located therein, either in order to remove blood, for example, from the vessel or to inject a treatment product into the vessel.
2. Description of Background Art
Several intravenous therapies, including the administration of chemotherapeutic medicaments and hyper-feeding, require the use of such a vascular catheter that is suitable for remaining in the patient's body for an implantation period that may sometimes last several weeks.
Typically, such a catheter is implanted by the femoral or jugular route (then through the subclavian vein, towards the upper vena cava).
Of the existing vascular catheters, that of EP-A-328 332 (or U.S. Pat. No. 5,030,210) is known in particular.
As in the invention, it is a "two-way" catheter for controlling the circulation of fluid through it from, or to, a duct of a human or animal body in which the catheter is inserted.
That catheter has a principal axis and comprises: internal passage, an inside diameter, an outside diameter, and a distal end having an opening that communicates with the passage, the body, the cap having an essentially flat distal wall facing the open distal end of the body, distal wall of the cap, to communicate with the passage in the body of the catheter, the valve reacting to pressure differences on either side of it, for the circulation of fluid from, or to, the duct.
In the above-mentioned patent it is indicated that the catheter disclosed therein has been optimised for the circulation of liquid, within the context of intravascular implantation.
In particular, it is indicated therein that the problem of circulating liquid in both directions (from or to the catheter) has been taken into consideration; the proposed catheter is supposed to provide such bi-directional operation, in particular without causing the catheter to fold or collapse in on itself on aspiration.
The proposed solution also claims to provide the distal end of the catheter with a structure that is sufficiently thick that it will not fold or become blocked as a result of movements of the patient, muscular movements or an aspiration vacuum; moreover, the valve slit arranged in a relatively thin wall covering the open distal end of the catheter is said to permit a rapid reaction of the valve to differences in pressure.
The catheter of EP-A-328 332, or U.S. Pat. No. 5,030,210, has a catheter body preferably made of polyurethane and having a thickness of approximately from 0.25 to 0.75 mm. The cap has a wall thickness of preferably from 0.05 to 0.25 mm. Silicone rubber, polyvinyl chloride, polyethylene or polytetrafluoroethylene may also be used. A single slit forming a valve is provided, its length being approximately from 30 to 70% of the inside diameter of the catheter. The slit arranged in the distal end wall of the cap is flattened against the open distal end of the body of the catheter, in such a manner that there is no gap between the distal ends of the body and of the cap.
Within the context of the present invention it is maintained that a further real improvement in operation, especially on aspiration, can be achieved and that a further improvement can likewise be obtained in the manner in which the problem of the wall surrounding the valve slit collapsing in on itself is resolved, in particular within the context of vascular catheters provided for injecting a treatment liquid into a vessel in one direction and, in the opposite direction, for allowing the removal of, especially, blood or a body fluid.
For bi-directional operation to be possible it is essential to ensure that the valve will open c
REFERENCES:
patent: 4475898 (1984-10-01), Brodner et al.
patent: 5000745 (1991-03-01), Guest et al.
patent: 5030210 (1991-07-01), Alchas
patent: 5085635 (1992-02-01), Cragg
B. Braun Celsa
Coggins Wynn Wood
Nguyen A. T.
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