Single use disposable needleless injector

Details Single use disposable needleless injector Single use disposable needleless injector

1992-10-30

1994-08-02

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604110, 604111, 604135, A61M 530

Patent

active

053341449

ABSTRACT:
A single use needleless hypodermic injector includes an elongate housing with a proximal end, a distal end, an axis and a hollow bore therethrough. The housing has a reservoir at the distal end with a generally cylindrical chamber for containing an injectable liquid. The chamber has a axis aligned with the housing longitudinal axis. The chamber has a first open end adjacent the housing with a resilient stopper mounted therein. The reservoir has a distal second end with an orifice in fluid communication with the chamber. The resilient stopper seals the chamber and ejects the liquid from the chamber, forming a stream at the orifice when the stopper is moved distally in the chamber. The injector has an piston mounted for axial movement within the housing bore and elements to axially bias the piston distally within the bore. The piston has an armed position wherein it is positioned proximally within the bore. The injector has elements to retain the piston in the armed position and to release the piston from the armed position. When the injector release elements are released, the piston moves distally to engage and move the resilient stopper distally, ejecting the liquid in the chamber through the orifice in a stream which will make a hypodermic penetration when the orifice is placed adjacent dermal tissue. The injector further has elements which prevent the piston from being retained in the armed position once the release elements are released, thereby rendering the injector non-resuable.

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patent: 5071353 (1991-12-01), van der Wal
patent: 5135496 (1992-08-01), Vetter et al.

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