| 摘要 |
<p>An infusion system is provided for purposes of infusing fluids, such as insulin, into a living body. A housing (2) is implanted within the living body and contains a reservoir of fluid, such as insulin, and an actuatable pump (6) for, when actuated, pumping a quantity of the fluid for delivery into the body as with a catheter (9) extending from the pump (6) to the body site. A pump actuation controller (110), which is normally electrically passive, is mounted within the housing for purposes of actuating the pump. The controller includes an antenna (12) for receiving an RF signal through the body from an external transmitter (4). The RF signal is converted into a DC signal for charging a capacitor (14). A voltage comparator (15) compares the charge level of the capacitor (14) with a reference level and provides a trigger signal when the levels attain a predetermined relationship. A capacitor discharge circuit is provided which includes a first actuatable switch (16), actuated by the trigger signal, and the pump. The capacitor is discharged when the switch is actuated for purposes of actuating the pump to thereby pump a quantity of the fluid for delivery into the body. This is accomplished only in response to the receiving antenna (12) having received an RF signal.</p> |
