Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1992-11-16
1994-08-16
Hirsch, Paul J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604274, A61M 2501
Patent
active
053383060
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for introducing a catheter into a blood vessel of a patient.
Intravenous cannulisation is an important procedure particularly in managing acutely ill patients. The procedure is carried out using a needle inserted through the cannula so that its tip projects from the cannula, inserting the needle into an artery or vein, then advancing the cannula over the tip of the needle and into the artery or vein, and then withdrawing the needle. This procedure requires very fine hand control and considerable practice on the part of the doctor carrying it out. Cannulisation is occasionally complicated and takes time and places the patient under considerable stress.
I have now devised a catheter introducing device which overcomes these problems and enables a cannula to be introduced in a quick, easy and reliable manner.
In accordance with this invention, there is provided a catheter introducing device which comprises means for holding a cannula with a needle inserted through it and with a tip of the needle projecting from the cannula, and a biassing arrangement which is normally locked but when released urges the cannula forwardly and over the tip of the needle.
In using this device, the needle tip, projecting from the cannula, is inserted into the artery or vein. Then by releasing the biassing arrangement, the cannula 13 automatically displaced forwardly over the tip of the needle and into the artery or vein. The needle and the introducing device can now be withdrawn, leaving the cannula inserted into the blood vessel.
In one embodiment the biassing arrangement comprises two elements for pushing against two wings projecting from opposite sides of the cannula. Preferably the arrangement includes a locking element which normally engages these wings to prevent the cannula advancing over the needle. Preferably the locking element is spring-biassed to a release position and is held in its locking position by the user, then released when the needle tip has been inserted into the artery or vein.
The biassing arrangement may comprise a gas spring, including a plunger which when released forces the cannula forwardly under the pressure of compressed gas. The gas e.g. air may be compressed by the plunger being pushed into a sealed cylinder such that the gas inside the cylinder is compressed. The cannula itself may form the plunger. The catheter introducing device may be supplied with the cannula already loaded onto the needle in its biassed position. After the biassing arrangement has been released, the introducing device can be discarded.
In an alternative embodiment the locking element may engage the body of the cannula, thus the cannula with or without projecting wings can be inserted into the blood vessels.
Embodiments of this invention will now be described by way of examples only and with reference to the accompanying drawings, in which:
FIG. 1 is a plan view of an embodiment of catheter introducing device in accordance with this invention, shown with a cannula and its needle held in position;
FIG. 2 is a side view of the device;
FIG. 3 is a perspective view of the device in its locked condition;
FIG. 4 is a similar view of the device when the lock is released;
FIG. 5 is a perspective view of a further embodiment of catheter introducing device in accordance with this invention, shown with a cannula and its needle removed from the device;
FIG. 6 is a sectional view of the device of FIG. 5 shown with the cannula and its needle held in position;
FIG. 7 is a sectional view of a further embodiment of catheter introducing device in accordance with the invention, shown with a cannula held in position; and
FIG. 6 in a sectional view of the device of FIG. 7, shown with the cannula partially removed from the device.
Referring to the drawings, there is shown a catheter introducing device which has a flat rectangular base 10 having at one end (its rear end) a pair of projecting leaves 12 for holding an enlarged end 20 of the needle. Two spring-loaded telescopic pushing elements 14 extend along opposite
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Hirsch Paul J.
Schindler Edwin D.
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