Pump apparatus for biomedical use.

摘要

A pump (1) (see Figure 5) for medical infusions has a disposable pump body (3) with a displaceable wall (4) which is displaceable to vary the volume of a pump chamber (13). The body is releasably coupled to a housing (2) having a piezoelectric transducer (44) operable to reciprocate the displaceable wall. The housing and body are connected by a connecting means (20-23,25-28,33-36) which provides for the displaceable wall being biassed into contact with the transducer. The connecting means includes locating members (20-23) with respective foot portions (25-28) which engage ramped surfaces (29-32) thereby providing cam action during connection. This arrangement allows the transducer to be correctly coupled to the disposable pump body in a precise and repeatable manner. <IMAGE>