Disposable hypodermic injection ampule

Details Disposable hypodermic injection ampule Disposable hypodermic injection ampule

1977-03-03

1978-11-07

Recla, Henry J.

Surgery

Truss

Pad

128218NV, 128218P, A61M 530

Patent

active

041240243

ABSTRACT:
A self-contained disposable explosively actuated ampule for performing needleless percutaneous injection. The ampule comprises an outer shell enclosing an elongated inner chamber including a closed rear end containing a propellant charge, a tapered funnel-shaped forward end, and a scored sealing member hermetically sealing the chamber in the area of its funnel shaped end. A metered dose of fluid injectant is confined between the scored sealing member and a sealing plunger separating the injectant from the charge. The plunger is adapted for axial movement within the chamber and comprises a main body having sealing means thereabout which are compressed and tightened against the inner chamber wall, and having a tip portion projecting forwardly from the main body. Gas released at very high pressure by the charge drives the plunger in the chamber and pressurizes the fluid injectant, thereby causing the scored sealing member to rupture and enabling the fluid to be discharged from the chamber forward end. Simultaneously, the outer circumferential surface of the plunger tip sealingly abuts the inner peripheral surface of the chamber forward end. The sealing elements in the plunger main body are comprised of an annular feather-edge seal around the rear end of the plunger and annular sealing means about the axial main body of the plunger.

REFERENCES:
patent: 2322245 (1943-06-01), Lockhart
patent: 2667874 (1954-02-01), Dickinson, Jr.
patent: 3802430 (1974-04-01), Schwebel et al.

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