| 摘要 |
<p>The pump has a chamber (11) in which a piston (12) reciprocates to pump a liquid. The piston (12) is moved by having secured thereto the armature (20) of at least one electromagnet (preferably two). The coil (29) of the electromagnet is suitably external of the pump casing (10). A control circuit pulses the electromagnet at a predetermined rate to provide a predetermined periodic output. In a preferred form, the pump is mounted together with a liquid reservoir (41) on a printed circuit board (40), and the unit is encapsulated for implantation in the human body to infuse a liquid medicine at a controlled rate into the bloodstream. </p> |
