Cartridge assembly for a lyophilized compound forming a disposab

Details Cartridge assembly for a lyophilized compound forming a disposab Cartridge assembly for a lyophilized compound forming a disposab

1994-03-28

1995-10-03

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604 92, 604411, 604416, A61M 3700, A61M 532, A61B 1900

Patent

active

054547865

ABSTRACT:
A cartridge assembly for holding a lyophilized product, forming a disposable portion of a pen injector includes a cylindrical glass cartridge adapted to receive the product, a closure cap, a cartridge case, and a plunger mechanism. The closure cap is adapted to retain an elastomeric disc seal during lyophilization and includes diametrically opposed ledges. The closure cap and seal are adapted to cover a neck portion of the ampule, the neck portion having on its end a radially extending circumferential flange. The ledges of the closure cap and the flange of the neck portion allow the closure cap to remain open during lyophilization, oxygen purge and nitrogen overlay. An oval-shaped indentation formed on the inside of the closure cap aids in snapping the closure cap about the flange without crimping to retain the closure cap underneath the flange. Reconstitution of the lyophilized drug is accomplished without foaming by use of an obliquely angled connector which causes the diluent to indirectly impinge on the drug. The injection pen and cartridge assembly cooperate such that the length of travel of the plunger rod during retraction is less than the axial length of a recess in the rod tip.

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Bedienungsanleitung, 1990, Instruction Booklet for Use of Optipen.

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