Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1996-08-27
1998-05-12
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604169, 604250, 604256, A61M 5178, A61M 500
Patent
active
057498598
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an improvement to systems which use an artificial tube for supply to or extraction of fluids from a human or animal body.
BACKGROUND ART
The insertion of a tube into a human or animal in many cases requires a hole to be pierced through the skin. For this purpose a device known as a trocar, a catheter or a cannula may be used. A trocar is a sharp pointed instrument adapted to punch the wall of the body. The trocar may have a catheter or cannula mounted onto it and upon removal of it from the catheter or cannula fluid may be extracted. A catheter is a tubular flexible instrument passed into a body cavity or channel for withdrawal of fluids from or introduction of fluids into the body cavity or channel. A cannula is for inserting into a duct or cavity in a body. During its insertion its lumen may be occupied by a stylet or trocar. A stylet is a wire adapted to run through a catheter or cannula to render it stiff or to remove debris from its lumen.
One specialized form of trocar or stylet is a hypodermic needle having a splash back with a window so that during insertion when blood is seen in the window it is known that a vein or artery has been pierced.
Generally in this specification and claims the word cannula will be used to describe either a catheter or cannula and trocar will be used to define a trocar, stylet or splash back.
Generally a catheter or cannula with a stylet or trocar or combination of these is used as an artificially inserted tube into a human or animal body either for the delivery of fluids into the body or the removal of fluids from the body. In one method a catheter or cannula assembly is inserted into a vein of an animal or human and the trocar or stylet is removed to leave the cannula or catheter in place. At the time of removal of the catheter or cannula there can be a problem with loss of blood and perhaps of more concern a danger with infection by blood or body fluid borne diseases. In the past there has been no reasonable solution to prevent this loss of blood.
It is the object of this invention to provide an arrangement by which the loss of blood or other body fluids is able to be restricted during the process of insertion of an artificial tube such as a catheter or cannula assembly into a human or animal body.
DISCLOSURE OF THE INVENTION
In one form the invention is said to reside in a catheter or cannula of the type to be mounted on to a trocar, the catheter or cannula incorporating a press or pinch point which is adapted to be resiliently deformed by externally applied pressure by at least one finger of a person during the insertion of the catheter or cannula tube and trocar assembly into a patient and removal of the trocar so as to prevent a flow of fluid through the catheter or cannula during the insertion and removal, wherein the catheter or cannula is of a type including a boss and a catheter or cannula tube and the portion which is adapted to be resiliently deformed is part of the boss.
The press point may be associated with the catheter or cannula assembly or may be as an attachment which can be fastened onto a catheter or cannula assembly.
It will be seen that generally by this invention, that the press point can be used during the insertion of the catheter or cannula assembly and during removal of a trocar or stylet used to make the catheter or cannula rigid during insertion to stop blood flow until a suitable connection has been made to the catheter or cannula for whatever purpose. When in the non-pinched state the pinch point of course does not provide any restriction to the insertion of the hypodermic needle of the stylet, trocar or splash back.
In an alternative form the invention may be said to reside in a catheter or cannula including a boss and a catheter or cannula tube, the boss including a first portion into which the catheter or cannula tube is mounted and a connection portion which enables the catheter or cannula to be connected to another item, characterised by a press or pinch point associated with the boss b
REFERENCES:
patent: 3794223 (1974-02-01), Patel
patent: 4243034 (1981-01-01), Brandt
patent: 4936542 (1990-06-01), Beard
patent: 4960259 (1990-10-01), Sunnanvader et al.
patent: 5312373 (1994-05-01), Freitas
patent: 5429616 (1995-07-01), Schaffer
patent: 5458581 (1995-10-01), Hull
patent: 5542933 (1996-08-01), Marks
Parashar Holdings Pty Ltd
Racunas Robert V.
Rimell Sam
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