| 摘要 |
PCT No. PCT/GB92/01539 Sec. 371 Date Aug. 4, 1994 Sec. 102(e) Date Aug. 4, 1994 PCT Filed Aug. 21, 1992 PCT Pub. No. WO93/03779 PCT Pub. Date Mar. 4, 1993.A needleless injector having a liquid metering chamber with an outlet orifice, a piston slidable within the metering chamber, and a rod arranged to strike one end of the piston to force liquid through the outlet orifice. A cam follower is mounted at one end of the rod to ride on a cam that retracts the rod away from the piston. The injector is in two parts which are biassed away from each other. The front part of the injector carries the outlet orifice and the rear part carries the cam. Actuation occurs when the two parts of the injector are sufficiently urged towards each other by the user to actuate the cam to release the rod and thereby strike the piston and force liquid through the outlet orifice.
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