Multiple chamber automatic injector
First Claim
1. An automatic injector comprising a body incorporating at least two chambers containing different ingredients of a medicament, said chambers being adjacent one another and separated by a thin impermeable membrane, a needle held in a sheathed position within said body, releasable drive means within said body which when released drives said needle from said sheathed position into an unsheathed position projecting from said body, expulsion means within said body for discharging the medicament through said needle, and a cutting or piercing means which is movable within said body from a first position in which it is separated from said membrane to a second position where it is forcibly in contact with said membrane so as to cut or pierce said membrane before said drive means is released.
10 Assignments
0 Petitions
Accused Products
Abstract
An automatic injector is provided having at least two chambers containing different ingredients of a medicament separated by an impermeable membrane. A lance is movable independently of a plunger to cut or pierce the membrane before a spring-loaded drive member for the plunger is released to drive a needle out of the body of the injector and discharge the medicament through the needle. A removable safety clip is provided for preventing movement of an actuating cap into an operative position for advancing the lance, and release of the drive member is preventable by a removable safety pin until the injector is to be used.
189 Citations
15 Claims
- 1. An automatic injector comprising a body incorporating at least two chambers containing different ingredients of a medicament, said chambers being adjacent one another and separated by a thin impermeable membrane, a needle held in a sheathed position within said body, releasable drive means within said body which when released drives said needle from said sheathed position into an unsheathed position projecting from said body, expulsion means within said body for discharging the medicament through said needle, and a cutting or piercing means which is movable within said body from a first position in which it is separated from said membrane to a second position where it is forcibly in contact with said membrane so as to cut or pierce said membrane before said drive means is released.
- 14. An automatic injector comprising a body incorporating at least two chambers, each containing different ingredients of a medicament, such chambers being adjacent to one another and separated by a thin impermeable membrane, a needle held in a sheathed position within said body, releasable drive means within said body which, when released, drives said needle from said sheathed position into an unsheathed position projecting from said body, a plunger within said body constituting expulsion means for discharging the medicament through said needle, cutting or piercing means comprising a lance arranged to extend through, and be slidable relative to, said plunger, said releasable drive means comprising a spring-loaded drive member engageable with said plunger and latching means associated with said releasable drive means, a spring held in compression by said latching means, said drive member being urged by said spring to advance said plunger when said latching means is released, and means for advancing said lance which is movable independently of said drive member.
Specification