Port catheter

Details Port catheter Port catheter

1994-12-20

1997-11-18

Rimell, Sam

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604174, A61M 500

Patent

active

056882475

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention pertains to a port catheter having a generally cylindrical casing with a chamber in it, which is sealed on one side by a needle-piercable membrane and to the other side of which is connected a tube catheter.
A port catheter of the referred type is already known from DE 38 37 779 C2. It can be implanted in the patient's body by means of a puncture creating a port of entry to the blood-vessel system or to another body cavity that cannot be reached otherwise. The port catheter resides under the skin after the puncture, and its membrane can be punctured through the skin with a needle. A tube is connected to the casing of the port catheter and takes the medications to their site of activity, where they are needed.
A port catheter of this type is very small to ease its implantation by means of a skin puncture. To be able to anchor the port catheter in spite of its small dimensions in the subcutaneous fat tissue, anchoring loops are fitted on the outer wall of the port catheter body. After the implantation, the introduction sleeve is pulled over the side of the already removed introduction cone. This results in the straightening up of the anchoring or securing loops, which were compressed to the wall of the port catheter body wall during the insertion, and their penetration into the surrounding fat tissue of the patient. This renders a stabilization of the position to the port catheter. The casing is held in its predetermined position during the insertion by a counter holder.
An object of this invention is to construct a port catheter of the mentioned type, by which the anchoring loops are simply built, simple to construct and simply and safely mounted on the casing. Furthermore it must be ensured, that in the implanted position after pulling the introduction sleeve the anchoring loops spread out and grant the port catheter a high degree of anchoring stability.
The basic object of the invention is achieved through the use of anchoring loops that protrude from the wall of the casing of the port catheter and can be bent together, said anchoring loops being made from spring wire which engage the casing over one position, protrude from this position in opposite directions to form two loops and again engage the casing at a second position axially spaced from the first position.
The basic idea of this invention is that the anchoring loops be made of a spring wire, whose ends embrace or engage the casing on two points that are axially apart from each other. This renders a high grade of bending strength diagonally to the longitudinal axis of the port catheter. In the circumferential direction the anchoring loops let themselves bend further, practically as a continuation of their embracing of the casing. This construction combines a high bending resistance that prevents movements in the axial direction, with a good bending capacity in the circumferential direction that does not require extra anchoring stability.
The materials for the cohesion of the anchoring loops can be variously constructed. A functional construction form consists of a fork with two teeth, which hold the ends of the folded loops together. The fork has a handle that reaches over the end of the casing facing the introduction cone. The ends of the teeth are a little bent over another. After the implantation, the rear end of the fork handle is captured and stretched so that the teeth release the anchoring loops that can now expand.
Another embodiment of the means for keeping the anchoring loops bent together is a string, one end of which embraces both ends of the anchoring loops, and which has a loop, releasable by pulling the other end of the string extending beyond the end of the casing facing the insertion cone. This construction form is extremely simple and reasonable.
Another possibility of using a string is, concerning a broader aspect of the invention, that one end of the string is connected to one of the anchoring loops while the other end passes through an eyelet in the other loop and then over the side o

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patent: 5300086 (1994-04-01), Gory et al.
patent: 5413565 (1995-05-01), Michels et al.

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