| 摘要 |
<p>An infusion pump (10) for administering fluid from a fluid source to a patient comprises a base member (12) having an electric motor (44) for driving a fluid pump housed within a cassette (14) detachably mountable on the base (12). The cassette houses a reciprocative piston (74) which pumps fluid to the patient while simultaneously drawing fluid from the fluid source so as to maintain a continuous flow rate. The cassette (14) houses deformable tubes (86a, 86b, 88a, 88b) connecting each of the pump's two fluid chambers to the cassette inlet and outlet to provide the necessary valving. The fluid flow rate is adjustably controlled by a microcomputer which regulates the motor (44) by repeatedly initiating electric motor driving pulses at a predetermined time rate, and terminating them in response to the advancement of the motor beyond one of a plurality of predetermined positions so as to maximize accuracy of flow rate while maximizing the power efficiency.</p> |
