초록 ▼

A needleless injection system and method for injecting a medical product including a needleless injection device having a nozzle assembly defining an ampule chamber for holding medication, an energy device for pushing medication out of the nozzle assembly, and an energy device actuating mechanism is

A needleless injection system and method for injecting a medical product including a needleless injection device having a nozzle assembly defining an ampule chamber for holding medication, an energy device for pushing medication out of the nozzle assembly, and an energy device actuating mechanism is disclosed. These components are operatively contained in a housing configured for hand held operation. The energy device is a self-contained gas spring operatively connected to a plunger operating within the ampule chamber. The gas spring is preferably stepped which can be used in many different applications, an air gun being one. The injection device can be provided with a coupling device for coupling a medication supply vial to the nozzle assembly. The nozzle assembly is removably situated in the housing with the plunger removable therewith.

대표청구항 ▼

[ What is claimed is:] [1.] A nozzle assembly for a needleless injection device having an energy source for propelling medication through said nozzle assembly comprising:a generally hollow body defining a chamber having an end terminal wall with an orifice for passage of medication therethrough and

[ What is claimed is:] [1.] A nozzle assembly for a needleless injection device having an energy source for propelling medication through said nozzle assembly comprising:a generally hollow body defining a chamber having an end terminal wall with an orifice for passage of medication therethrough and an open end opposite said terminal wall, said body having means for removably connecting to an injection device;a pressure wall member movably positioned within said chamber, said pressure wall member having means for sealing said chamber from said open end, wherein said pressure wall member is movable toward and away from said terminal wall to introduce and expel medication into and out of said chamber through said orifice; anda lost motion connecting mechanism for removably connecting said pressure wall member to an energy source and for providing a predetermined free travel distance between the pressure wall member and an energy source, said lost motion connecting mechanism including a resilient snap fit member which extends from said pressure wall member in a direction opposite said terminal wall,said snap fit member including a plurality of prongs, each prong extending from the pressure wall member and having a tab extending radially inwardly, said prongs forming a connection between said pressure wall member and an energy source, wherein said prongs are confined within said chamber and are dimensioned to slide inside said chamber with an inner wall of said chamber confining said prongs from moving laterally outwardly to maintain locking engagement between said pressure wall member and an energy source during use.