Needle-less injector
First Claim
1. A needle-less injector comprising:
- a chamber defined within said injector for containing liquid to be injected;
a front portion having means defining a liquid outlet for said chamber;
a rear portion having means defining a handle for said injector;
a dispensing member in contact with the liquid in said chamber and movable in a first direction to reduce the volume of said chamber to cause the liquid contained therein to be expelled through said liquid outlet;
an impacting member arranged to strike said dispensing member to cause movement thereof in said first direction;
means for resiliently urging said rear portion away from said front portion; and
means for actuating said injector, or permitting actuation thereof, in response to the application of a selected amount of axial pressure to said front portion to cause said front portion to move towards said rear portion against the force of said means for resiliently urging.
5 Assignments
0 Petitions
Reexamination
Accused Products
Abstract
A needless 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.
446 Citations
12 Claims
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1. A needle-less injector comprising:
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a chamber defined within said injector for containing liquid to be injected; a front portion having means defining a liquid outlet for said chamber; a rear portion having means defining a handle for said injector; a dispensing member in contact with the liquid in said chamber and movable in a first direction to reduce the volume of said chamber to cause the liquid contained therein to be expelled through said liquid outlet; an impacting member arranged to strike said dispensing member to cause movement thereof in said first direction; means for resiliently urging said rear portion away from said front portion; and means for actuating said injector, or permitting actuation thereof, in response to the application of a selected amount of axial pressure to said front portion to cause said front portion to move towards said rear portion against the force of said means for resiliently urging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification