Hypodermic syringe holder for use with disposal ampoules

Claim 1

In a hypodermic syringe holder of the type where an axially movable ampoule clamping element is engaged with the rim of an associated ampoule to securely immobilize the ampoule within the barrel of the syringe holder by rotating the clamping element about its longitudinal axis within the head portion of the holder, the improvement which comprises in combination: a semi-cylindrical body portion having a generally cylindrical head portion; an axially mounted clamping element rotatableabout its longitudinal axis within the cylindrical head of said body portion and having a barrel portion, a handle portion and a helical groove on the outer surface of the barrel portion thereof, said clamping element having a bore therethrough with diminished and enlarged portions thereof; a plunger element having affixed to its lower end a piston engaging means, said plunger rod and piston engaging means being axially and slidably receivable within said bore of said clamping element; and a boss element having on its underside a hemispherical portion engageable with said helical groove of said clamping element, said boss being permanently affixed to the head portion of said syringe holder to thereby secure all elements thereof together in cooperative engagement with one another.