MEDICAMENT INJECTING DEVICE

• US 3,782,380 A
• Filed: 01/04/1973
• Issued: 01/01/1974
• Est. Priority Date: 01/04/1973
• Status: Expired due to Term

• Current Assignee: Harry Van Der Gaast
• Original Assignee: Harry Van Der Gaast
• Inventors: Van Der Gaast, Harry
• Primary Examiner(s): Gaudet, Richard A.
• Assistant Examiner(s): Recla, Henry J.
• Application Number:
  US05/320,994
• Time in Patent Office: 362 Days
• Field of Search: 128/173H,173R,218F,218C,218G,218A,218PA,218P,218R 29/212R,212D 227/132,146 417/234,470,471 92/130 222/340
• US Class Current: 604/68
• 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 device for pressure administration of a fluent medicament in which a cartridge, containing the medicament, includes a small discharge orifice in communication with an enlarged chamber containing the medicament, encapsulated therein by a dispensing piston. The capsule is removably mounted in one end of a barrel of the device containing a force transmitting means, operable by a handle lever, to discharge the medicament from the orifice at a skin-penetrating pressure. Means are provided for automatically resetting the device for subsequent use with another cartridge when hand applied pressure is released from the handle.

Claims

1. A device for pressure administering fluent medicaments comprising, A. an elongated barrel providing, 1. a main cylindrical chamber, and 2. a reduced diameter aperture through the portion thereof, just inwardly of the front end, in axial alignment with said cylindrical chamber;

B. a plunger assembly comprised of 1. a plunger rod having a forward portion, slidably journaled through said aperture, 2. a piston, fixed to said plunger rod, slidably engaged in said main chamber, and 3. an enlarged head at its rear end;

C. a housing, fixed relative to the open rear end of said cylindrical chamber;

D. trigger means pivotally carried in said housing;

E. lock means pivotally carried in said housing, normally locking said trigger means relative to said enlarged head to hold said plunger assembly against longitudinal movement in said barrel;

F. a compression spring, circumposed about said plunger rod between said piston and a washer means slidably engaged along the rear portion of said plunger rod;

G. an angular handle lever, pivotally attached relative to said housing and including, 1. an elongated handle grip portion, and 2. a short arm including abutment means, normally in contact with said washer means, whereby the initial, major pivotal movement of said handle grip causes said compression spring to be compressed to store energy therein;

H. means connecting between said short arm and lock whereby the final, minor pivotal movement of said handle grip unlocks said trigger to release said stored energy to drive said plunger assembly forwardly;

I. means to detachably mount a medicament cartridge assembly relative to the front end of said barrel whereby the medicament is discharged therefrom when said plunger assembly is driven forwardly.

2. a reduced diameter aperture through the portion thereof, just inwardly of the front end, in axial alignment with said cylindrical chamber;

B. a plunger assembly comprised of

3. The device as defined in claim 1 wherein said means to detachably mount includes a cartridge magazine, detachably mounted relative to the front end of said barrel as by a twist-lock structure and providing an interior chamber for the reception of a cartridge containing a medicament.

4. The device as defined in claim 3 wherein said cartridge magazine is formed in two halves, hinged together.

5. The device as defined in claim 4 wherein Said cartridge provides an interior chamber filled with a medicament, a piston in closing relation to the normally open rear end thereof and a small discharge orifice opening through the front end thereof.

6. The device as defined in claim 5 wherein said cartridge is formed of glass and said piston is formed of rubber.

7. The device as defined in claim 1 wherein said trigger provides a V notch, normally in engagement with an edge portion of said enlarged head, and a corner normally in engagement with a notch in said lock means, said trigger and lock pivots being staggered relative to each other.

8. The device as defined in claim 7 wherein said means connecting between said short arm and lock comprises a transverse rod slidably engaged in slot means in said short arm and a rearwardly extending projection connecting between said transverse rod and lock.

9. The device as defined in claim 8 including tension spring means connecting between said lock and said housing.

10. The device as defined in claim 1 including spring means to return said handle lever to its normal position after each injection operation and to simultaneously recock said plunger assembly relative to said trigger and lock means.