Patent ID: 8486006

Claim:
A medical injector comprising: a body; a slidable button at least partially disposed in said body; a displaceable plunger disposed in said body; a spring disposed to advance said plunger; and, a releasable retainer for retaining said plunger in a first state against force of said spring, wherein, upon a predetermined extent of sliding movement of said button within said body, said button engages said releasable retainer so as to cause said releasable retainer to release said plunger thus allowing said spring to advance said plunger, wherein said releasable retainer includes at least one latch tab extending from said plunger and at least one ledge formed in said body, said ledge interferingly engaging said latch tab to retain said plunger in said first state, and wherein, upon said predetermined extent of sliding movement of said button, said button telescopes over said at least one latch tab and causes inward deflection of said latch tab so as to come out of interfering engagement with said ledge thus allowing said spring to advance said plunger.