Needleless injection port with automatic backcheck valve

Claim 1

A needleless injection port and automatic backcheck valve comprising a generally tubular body having a bore extending along a first axis, a pair of ports extending laterally from said body, each port being in communication with said bore, and said ports being offset along said axis, a spool inserted within said bore, said spool having a pair of rims defining an annular space therebetween, means for biasing said spool toward one end of said bore, said spool being axially movable between a first position in which said ports are in fluid communication with one another via said annular space, and a second position in which one of said rims blocks such communication, one end of the body having an opening into which a syringe tip can be inserted to move said spool from said first position to said second position, whereupon the syringe is in fluid communication with only one of said ports, wherein said body has a luer fitting at one end for receiving a syringe, the fitting including a luer taper of lesser diameter than said bore, thus defining a circumferential ledge at one end of the bore which provides a stop for the spool, and the spool has a cylindrical extension at one end, said extension fitting closely within said luer taper, and having a bead at its distal end which bears against the luer taper, forming a seal therewith.