MEDICAL INFUSION PUMP WITH CLOSED LOOP STROKE FEEDBACK SYSTEM AND METHOD

摘要

A medical pump (10) with a closed loop stroke feedback system and method, for use with a pumping chamber (24), for example in a cassette (12), is disclosed. The pump includes a pumping element (44) that intermittently pressurizes a pumping chamber during a pumping cycle. A pressure sensor (46) detects the pressure exerted by the pumping element on the pumping chamber. A position sensor (48) detects the position of the pumping element. A processing unit (30) processes pressure data from the pressure sensor and position data from the position sensor to determine a calculated stroke volume of the pump for a pump cycle, and to adjust a stroke frequency of the pump to compensate for variation in the stroke volume.