Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-03-03
1995-06-13
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604905, A61M 2500
Patent
active
054237769
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a flexible coupling for connecting a flexible catheter to a port of a port catheter system. This application is A 371 of PCT/EP92/02038, filed Sep. 4, 1992.
BACKGROUND OF THE INVENTION
In a known catheter system the port consists of a flat housing containing a chamber which is covered by a covering consisting of silicon and penetrable by a cannula. A flexible catheter can be connected to the chamber. Port catheters are implanted so that the hose can be led to the application site, e.g., a vessel. To bring a medication to the application site, the skin and the silicon covering arc pierced with a cannula and the medication injected into the chamber, from where, through the coupled catheter, it reaches the application site where it is used.
The implantation of a port catheter system is considerably facilitated if the port and the flexible catheter arc disconnectably connected to each other, so that both parts can be handled individually for the implantation. It is especially useful if no special coupling part is necessary on the flexible catheter, so that the latter can be cut off as required and thus be coupled in any desired length to the port. Known flexible catheters provide tubular parts for sliding on the flexible catheter as well as clamping couplings or snap-action squeezing couplers of various designs for the coupling of the flexible catheter. Common to all these known forms of execution is that in each instance they arc suitable for a given hose material, a given hose diameter and a given wall thickness of the hose. For this reason, it is necessary to have available a large number of different flexible catheter coupling types for different hose diameters, wall thickness and kinds of material.
SUMMARY OF THE INVENTION
The object of the invention is to create a flexible coupling of the type in question which is suitable for the coupling of a flexible catheter of varying diameter, varying wall thickness and varying material to a port of a port catheter system.
The invention consists in tapering the tubular part over which the hose or catheter tube slides so that the hose is enlarged with increased engagement. Correspondingly, there results an expanding contact area on the outer surface of the hose. This contact area is operable for hoses of different diameters. According to another important characteristic of the invention, a clamping sleeve is provided which can be slid over the hose and locked to the housing of the port catheter system. The sleeve has an internal squeezing or gripping edge or shoulder whose internal diameter is smaller than the largest expanded diameter of the hose when pushed onto the tapered tubular part. When the clamping sleeve and hose is pushed onto the tubular part, the gripping edge comes in contact with the exterior surface of the hose at a given point, squeezes it somewhat and pushes the hose a little farther onto the tubular part as the sleeve is locked to the housing. In this way, a very positive connection is provided between the clamping sleeve and the hose end which assures a secure mounting of the end of the hose on the tubular part. Due to the high pressure in the area of the squeezing edge, a good seal also is made with the tubular part. In the secured position then the clamping sleeve is connected with the housing on which the tubular part is located, so that a total coupling is produced.
Since the catheter hose or tube to be coupled is slid completely onto the tapered tubular part and is thus enlarged to provide a secure connection, hoses of very different diameters and also of different wall thicknesses or material composition can be securely coupled. It is not necessary that clamping sleeve be designed differently in each case. If a complete mounting of a small diameter hose on the tubular part is not possible, then it is necessary that the squeezing edge must have a correspondingly different position with respect to the tubular part in order to compress the hose. The internal width or diameter of the squeezing edge must be smaller t
REFERENCES:
patent: 1361758 (1920-12-01), Ewald
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