Injection device which is rendered unusable on the completion of

Details Injection device which is rendered unusable on the completion of Injection device which is rendered unusable on the completion of

1997-03-13

1998-06-02

Buiz, Michael

Surgery

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

Treating material introduced into or removed from body...

604110, A61M 532

Patent

active

057591776

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
THIS INVENTION relates to an injection device and in particular relates to a device in the form of a syringe which can be utilised for the injection of a parenteral agent into the body.
2. Description of the Related Art
The present invention comprises a development beyond the device disclosed in International patent application PCT/AU93/00175 and International patent application PCT/AU94/00618, the contents of each of which are included herein by reference. Each of those disclosures relate to injection devices which can be utilised in the injection of a parenteral agent into the body whereby on completion of the injection, the device is rendered unusable. It is a characteristic of each of these devices, however, that during the injection of the parenteral agent the needle is moved rearwardly within the body of the syringe, and as a result of that movement, the tip of the needle is caused to move outwardly from tissue within which it may be located. While this arrangement may be satisfactory in a large number of applications, there are instances in which it is necessary to deposit the parenteral agent deeply within the tissue and/or where retraction of the needle within the body during the injection process is undesirable.


SUMMARY OF THE INVENTION

It is an object of this invention to provide an injection device which is capable of being rendered unusable on completion of its use, but which is arranged such that the needle can remain substantially generally stationery within the tissue during the injection step.
In one form, the invention resides in an injection device comprising a hollow body, having a forward end and a rearward end, the forward end slidably receiving a hollow needle, the body providing a chamber between its forward end and its rearward end, the chamber being defined between a plug and a stop, the plug being sealingly and slidably received within the body adjacent the forward end, the stop being slidably and sealingly received within the body rearward of the plug wherein a greater degree of effort must be applied to the stop than to the plug to effect slidable movement within the body, the rearward end of the body having a portion in which the stop is not sealingly received in the body, a drive element connected at one end to the plug member and slidingly and sealingly received through the stop member to extend from the rearward end of the body, a manipulation means provided on the other end of the drive element, the hollow interior of said needle being connected to the chamber through a flexible passageway extending between the inner end of the needle and the plug, said needle being connected to the plug or stop by a tensioning means, a means between the needle and body adapted to retain the needle at a first position at which it extends from the body and said means being adapted to be able to release the needle to allow the needle to move to a second position at which it is accommodated within the body, the movement between the first and second position being effected by the tensioning means.
According to a preferred feature of the invention, the drive element is flexible. It is a preferred characteristic of the drive element that the manipulation means cannot be used to push the stop or the plug towards the forward end of the body. The manipulation means may comprise a slider which is slidably supported in the rearward end of the body or alternatively may take the form of a ring or tab or like means which can be grasped and pulled to effect movement of the plug.
According to a further preferred feature of the invention, the rearmost end of the body is configured such that movement of the stop and plug into the rearward end is irreversible.
According to a preferred feature of the invention, the tensioning means comprises a flexible tube which also forms the passageway. The tube may be formed of a suitable resiliently extendable material and/or a resiliently extendable element may be incorporated into or around the tube. According t

REFERENCES:
patent: 4908022 (1990-03-01), Haber
patent: 5120310 (1992-06-01), Shaw
patent: 5188613 (1993-02-01), Shaw
patent: 5562635 (1996-10-01), Whisson

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