| 摘要 |
<p>The invention provides a jet expelling assembly (400) comprising a reservoir (30) and an impulse chamber assembly (10). The impulse chamber assembly comprises a chamber portion (13) defining a cavity having a general axis, a piston (20) received in the cavity along the general axis and comprising a fluid inlet, thereby defining a variable-volume impulse chamber with an outl et nozzle (16). The inlet comprises a conduit (22) adapted to slidably engage a reservoir outlet during relative movement therebetween. The chamber portion is arranged stationary relative to the reservoir, whereby expelling an amount o f drug from the reservoir to the impulse chamber via the inlet causes the pist on to move towards the reservoir, the impulse chamber thereby receiving the expelled amount of drug.</p> |
