To provide a driving system of a needle-free injector which can use a charge (loading) by a spring power and a once filled medicament liquid to divide the volume into several times of injections.
The driving system includes a case body 6, a piston 14, and a coil spring 15, wherein the front of the case body 6 has both a nozzle 5 and a syringe 3 in a needle-free injector 1 furnished with a slidable plunger 4; the piston 14 is set in the case body 6 to oppose the plunger 4 so that the piston 14 may be movable forward to push the plunger 4; and the coil spring 15 is set in the case body 6 and pushes the piston 14 forward. One part of elasticity by the compressed coil spring 15 elongates one part of the coil spring 15 to push the piston 14 forward, thereby to collide with the plunger 4. Then, the coil spring 15 is pulled backward together with the piston 14 to form an impacting gap J between the plunger 4 and the piston 14, and then the remaining part of elasticity by the coil spring 15 elongates again the coil spring 15 to push the piston 14 forward, thereby to collide with the plunger 4.
HASHIMOTO TAKESHI
KUDO SHIGERU
JIM FUKUSHIMA
| JPH11514242A | 1999-12-07 | |||
| JP2002360691A | 2002-12-17 |
| US2605763A | 1952-08-05 |
Masayoshi Yoshida
Tomoyuki Takahashi