Medicament dispensing device

摘要

A portable medicament dispensing device having a mechanism which is not susceptible to jamming for dispensing the medication to a user. The device employs employs a coupling for coupling the relative motion between reciprocating body members housing the ancillary components and a barrel plunger associated with the syringe. One embodiment provides a pivoting coupling whereas an alternate uses a rack and pinion system. The advantage of simplifying such mechanisms results in a structure which has smooth unemcumbered motion with fewer parts to avoid mechanical jamming during use.

主权项

1. An automatic injection device for dispensing a medicament, said device having a needle connected to a barrel adapted to retain medicament and a plunger within said barrel wherein said device comprises:
an outside first body member and a second body member coaxially mounted for reciprocal movement within said outside first body member, said outside body member housing said needle, said barrel and said plunger; a first rack and a second rack housed within said outside first body member; a third rack connected to said plunger; and a pinion mounted within said outside first body member and between said first rack and said third rack and between said second rack and said third rack, said second body member including a needle cover biased to cover said needle and movable to expose said needle in use and to move said first rack and said second rack for urging said plunger into said barrel to dispense said medicament.