Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-01-17
1998-12-01
Coggins, Wynn Wood
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604195, A61M 500
Patent
active
058430342
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a hypodermic syringe and more particularly to a hypodermic syringe incorporating means for retracting a needle within the syringe and thereby preventing re-use of the syringe.
BACKGROUND OF THE INVENTION
Presently, there is considerable concern within the general public and within the medical profession relating to injuries or infections caused by accidental stabbing of a person by a needle affixed to a hypodermic syringe. Such injury or infection is commonly referred to as a "needle-stick injury". This type of injury arises because hypodermic syringes currently in use are provided with needles which are exposed before and after use of the hypodermic syringe. Capping or shielding of needles can be employed. However, needle-stick injuries can occur during recapping or reshielding after the syringe has been used. For this reason recapping is forbidden in many medical institutions. Additionally, re-use of a used syringe exposes persons to the risk of infection.
A number of solutions to the problems caused by exposed needles on used syringes have been advanced. For instance, Australian Patent Application No. 628814 discloses a hypodermic syringe having a retractable needle carried in a needle support mounted on the end of the syringe body, the needle being attached to a needle holder which has a conical head on the end distant from the point of the needle. A passage in the needle holder enables communication between the needle bore and the chamber of the syringe through holes in the needle holder. The piston has a sealing cap engaged therewith and also a forwardly extending tubular portion defining an opening with a tapered wall which engages over the conical edge of the needle holder to lock the head behind an abutment surface when the piston is pushed in. At the same time a diaphragm formed by the sealing cap extending across the tubular portion of the piston is ruptured so that the chamber of the syringe is no longer sealing the enclosed. Withdrawal of the piston and the associated plunger draws the needle into the chamber. The needle can then be received into a housing within the body of the plunger. This approach was perceived as addressing or overcoming disadvantages seen in the complexity of arrangements such as those disclosed in the U.S. Pat. Nos. 4,779,655, 4,710,170, 4,675,005, 4,650,468, 4,592,744 and 4,507,117.
However movement of the piston away from the closed end of the body of the syringe is necessary if the needle is to be drawn into the chamber of the syringe. Prior to this manoeuvre being completed the potential for needle-stick injury is still real. Additionally, further movements are required to effect receival of the needle into the housing provided in the body of the plunger of the piston.
Other solutions have been proposed in International Patent Application No. PCT/ES90/00002, U.S. Pat. No. 5,049,133, U.S. Pat. No. 4,838,869, U.S. Pat. No. 4,966,593, International Application No. PCT/FR90/00656, and Australian Patent Applications 57097/90 and 39180/89. However, these specifications concern themselves with what are called "fixed needle" syringes. The needles on these syringes are not capable of being interchanged to take different requirements into account. Further, the syringes have an appreciable number of components, leading to relatively high manufacturing costs.
The present invention seeks to provide a hypodermic syringe which will be useful in reducing needle-stick injury and which will permit interchanging of needles to meet varying requirements.
The present invention also seeks to provide a hypodermic syringe which, after use, cannot be re-used.
The present invention also seeks to provide a hypodermic syringe which is economical to manufacture and has a small number of components.
Other objects, advantages or features of the present invention as set forth in the following description all will become apparent by practice of the present invention.
DESCRIPTION OF THE INVENTION
According to one aspect of the present invention
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Redfern Elaine
Redfern, deceased Robert Roy
Van Noorden Fleur Denise
Van Noorden Jon James
Coggins Wynn Wood
Lok-Tek International Ltd.
Nguyen A. T.
Orzechowski Karen Lee
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