Medical or veterinary injection device

Details Medical or veterinary injection device Medical or veterinary injection device

1994-09-23

1998-11-10

Hirsch, Paul J.

Surgery

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

Treating material introduced into or removed from body...

604156, A61M 520

Patent

active

058336613

DESCRIPTION:

BRIEF SUMMARY
The invention concerns veterinary or medical devices and more particularly the injection of liquids into living tissues with the aid of a hollow needle which moves the liquid under low pressure as far as its end implanted in the derm or flesh. Another sector concerned is the processing of foodstuffs.
A number of devices have been produced able to replace the hand of the medical practitioner for implanting the needle and injecting the liquid. The purpose of these devices is to prevent the patient from experiencing pain during implantation or injection and avoid the operator from becoming tired. However, up until now, these devices have not been entirely satisfactory as they are too heavy, expensive and inadequately protected against the risks of transmitting infection from one patient to another.
For example, the U.S. Pat. No. 4,790,823 granted 13 Dec. 1988 in the names of CHARTON and GASQUET describes a device comprising a handpiece connected by a flexible pipe to a console placed on the floor, the console providing the handpiece with compressed air or the electric current and even possibly the liquid to be injected under pressure. This liquid originates from a syringe whose piston is propelled by a screw activated by an electric micromotor. However, the console takes up an excessively large amount of space and is expensive, and the handpiece, although light in itself, is connected to it by a compressed air pipe and possibly an electric wire which interferes with its handling.
The French Patent No 78.08827 (published under U.S. Pat. No. 2,401,667) in the name of ISLAND S. R. L., describes a similar device where the piston of the syringe fitted with the needle and borne by the handpiece is propelled by a pneumatic jack fed with compressed gas by a flexible pipe connected by a quick-dismantable connector to a pressure reducing valve which equips an under pressure gas receptacle distinct from the handpiece. Here again, the pipework interferes with the handling of the handpiece which is not autonomous during injections. In addition, the catapult bearing the needle and syringe is quite heavy which requires a relatively high pressure so as to feed the jack and thus requires considerable consumption of compressed air limiting the autonomy of the device. Secondly, the pneumatic jack, which propels the piston of the syringe so as to inject the liquid, receives pressure adjusted by a variable section orifice which makes the speed of injection and thus the volume injected dependent on the manual skill of the operator.
The French Patent No 84.11336 (published under U.S. Pat. No. 2,567,760) in the names of HIBON and KABLA describes an autonomous pistol-shaped handpiece whose handle contains a movable under pressure gas bottle. Here again, the catapult bears the needle and syringe and is again relatively heavy, and secondly the propulsion of the piston of the syringe is ensured by the same jack as that of the catapult which does not allow the injection pressure to be adjusted.
The aim of the present invention is to resolve the drawbacks inherent in known devices and to this effect offers an injection device comprising sufficient autonomy for medical practice allowing for precise and painless implantation and injection and reducing operator fatigue whilst lending itself to rigorous aseptic treatment.
In order to achieve the above, the device of the invention is constituted by a handpiece containing firstly a pneumatic jack designed to propel against a recall spring a catapult bearing an injection needle, and secondly a movable syringe containing the liquid and connected to the needle with in addition a pneumatic member for propelling a mobile piston into the syringe, the jack and pneumatic member being fed by a given receptacle equipped firstly with a pressure reducing valve delivering gas at constant pressure to the jack, and secondly a variable section orifice delivering the under pressure adjustable gas to the pneumatic member, the invention being characterized in that the variable section orifice forms part of a seco

REFERENCES:
patent: 3353537 (1967-11-01), Knox et al.
patent: 3768472 (1973-10-01), Hodosh et al.
patent: 4790823 (1988-12-01), Charton et al.
patent: 5064413 (1991-11-01), McKinnon, Jr. et al.
patent: 5173645 (1992-12-01), Guerrero
patent: 5383851 (1995-01-01), McKinnon, Jr. et al.
patent: 5780279 (1998-07-01), Schmidt

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