Syringe or like parenteral device

Details Syringe or like parenteral device Syringe or like parenteral device

1996-03-29

1998-06-09

Buiz, Michael

Surgery

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

Treating material introduced into or removed from body...

A61M 3700

Patent

active

057626332

DESCRIPTION:

BRIEF SUMMARY
FIELD OF INVENTION

This application is a 371 of PCT/AU94/00618 Oct. 11, 1994
THIS INVENTION relates to a syringe or like parenteral device.
Throughout this specification the term "syringe or like device" shall be taken to include any device which can be used for the conveyance of parenteral fluids which are to be introduced into or drawn from the body through the skin and shall include within its scope a syringe, a cannula, a hypodermic needle, an intravenous infusion line, and like devices.


BACKGROUND OF THE INVENTION

A primary characteristic of parenteral devices is the provision of a sharp hollow needle to facilitate the transfer of fluids to or from the body. The difficulty created by the presence of such a needle arises from the possibility of injury which may be caused to a user or to medical staff when using the device, or indeed to any person who may be required to handle the device before or after use.
Of course, the injury itself does not represent the major concern. The major concern arising from the dangers of infection from such injuries is due to the pathogens which may be present on the needle as a result of its use. Indeed, it has been proven that a number of viral infections, notably the HIV virus and hepatitis B, can be transmitted by the reuse of needles previously used to inject an infected individual.
These dangers have resulted in the development of very careful and sometimes detailed disposal procedures being adopted in institutions where such parenteral devices are used. It has also resulted in attempts being made at developing single use parenteral devices that are not capable of being reused.
However, the disposal procedures adopted by such institutions are not able to be enforced in out-of-clinic situations, such as those situations where individuals inject recreational drugs. Further, the users of recreational drugs are often capable of quite easily manipulating a so called "one use" syringe to be able to continue using that same syringe.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved parenteral device wherein operation of the device in performing an injection alters the configuration of the device such that the device becomes extremely difficult to refill and also to reuse. A further object is to provide a parenteral device having a needle that retracts so as not to be exposed after use.
The present invention provides a syringe or like device comprising a tubular body having a forward end and a rearward end, the forward end being capable of receiving a hollow needle therein so as to be able to project therefrom, the retractable needle being slidable relative to the body, the body also including a chamber capable of receiving parenteral fluid and capable of being reduced in volume to expel fluid contained therein, wherein; the needle is capable of being manually retracted within the body by a retracting means such that the chamber reduces in volume to expel fluid contained therein and such that the needle is retracted to be wholly contained within the body; the needle is supported at one end from the body by a plug, the plug being configured to be sealingly engaged with the internal walls of the body and to be slidable within the body; the chamber is located rearwardly of the plug and the plug is adapted to enable the needle to communicate with the chamber through the plug; a stop is provided in the body rearward of the plug to define the rear end of the chamber, the stop means being slidable relative to the body and being in sealing engagement with the internal walls of the body, whereby a greater degree of force is required to move the stop than to move the plug; the rearward end of the body slidably supporting a slider for axial slidable movement, a protrusion on said slider for manipulation thereof to effect said axial movement, wherein said retracting means comprises a flexible member, secured at one end to the plug and secured at its other end to the slider and slidably and sealingly received through the stop.
By holding the

REFERENCES:
patent: 2475060 (1949-07-01), Smith
patent: 3368558 (1968-02-01), Sarnoff et al.
patent: 3587575 (1971-06-01), Lichtenstein
patent: 4314556 (1982-02-01), Ma
patent: 5032117 (1991-07-01), Motta

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