DISPOSABLE PYROTECHNICALLY POWERED INJECTOR

• US 3,802,430 A
• Filed: 06/30/1972
• Issued: 04/09/1974
• Est. Priority Date: 06/30/1972
• Status: Expired due to Term

• Current Assignee: Leonard G. Arnold, Paul R. Schwebel
• Original Assignee: Leonard G. Arnold, Paul R. Schwebel
• Inventors: Schwebel, Paul R., Arnold, Leonard G.
• Primary Examiner(s): Gaudet, Richard A.
• Assistant Examiner(s): Recla, Henry J.
• Application Number:
  US05/268,102
• Time in Patent Office: 648 Days
• Field of Search: 128/173H,218D,218F,218M,DIG.11,DIG.12,184,215 102/92,37.4,39,8 89/1B
• US Class Current: 604/69
• CPC Class Codes: A61M 2005/3104 Caps for syringes without needle
• CPC Class Codes: A61M 5/2046 Media being expelled from injector by gas generation, e.g. explosive charge
• CPC Class Codes: A61M 5/30 Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules

Abstract

A disposable pyrotechnically powered injector comprising a barrel formed to receive an ampule, an ampule having a plug at one end and an orifice at the other and containing a selected medicament, a plunger activated gas generating pyrotechnic charge, and a gas operated piston positioned in the barrel and adapted to drive the plug within the ampule and thereby discharge the medicament under high pressure through the orifice.

Claims

1. A disposable deflagratory powered injector comprising:

a hollow barrel having an expansible bellows chamber therein and an annular sleeve at one end adapted to receive an ampule;

an ampule slidably inserted into said sleeve, said ampule having a plug at one end and an orifice at the other end and containing a selected medicament;

an encapsulated gas-generating deflagratory charge positioned at the end of the barrel remote from said sleeve in direct and unobstructed communication with said bellows chamber and discharging all of the gas generated thereby under pressure into the adjacent end of said bellows;

a gas-operated piston carried by and forming a seal at the end of said bellows chamber remote from said charge, said piston engaging and driving the plug slidably within the ampule under the influence of the gas generated by said charge, and thereby discharging the medicament contained therein through the orifice under high pressure;

a primer effectively connected to the charge to ignite said charge when activated; and

a firing mechanism mounted in the end of the barrel containing said charge to activate said primer.

2. The deflagratory powered injector of claim 1 wherein said firing mechanism includes:

a firing pin positioned in the barrel adjacent the primer;

resilient means urging said firing pin against the primer with sufficient force to activate said primer;

releasable restraining means positioned between the barrel and the firing pin restraining said firing pin; and

releasing means carried by the barrel and extending outwardly thereof for releasing said restraining means.

3. The deflagratory powered injector of claim 2 wherein:

said restraining means includes a recess in the inner wall of the barrel and a frangible member formed on said firing pin extending into said recess; and

said releasing means includes a plunger mounted for axial movement in the barrel and adapted to rupture said frangible member.

4. The deflagratory powered injector of claim 3 wherein said resilient means is a spring carried by the plunger and exerting expansive force between said plunger and the firing pin.