Pump and a fluid dispensing device incorporating a pump

Details Pump and a fluid dispensing device incorporating a pump Pump and a fluid dispensing device incorporating a pump

A - Human Necessities

61

M

103/30, 128/80

A61M 5/14 (2006.01) A61M 5/142 (2006.01)

Patent

CA 1303929

ABSTRACT A pump (2) for use in an implantable drug delivery system for ambulatory patients meets the requirement for small size by comprising a piezoelectric disc element bonded to a diaphragm member forming one wall of a pump chamber (18), and a battery (26) and electrical circuits (22) for cyclically applying electrical voltage to the piezoelectric member whereby to induce pumping movement in the diaphragm member to pump drugs from a reservoir (12) via a valve (14) to a delivery cathetor (20) via a valve (16). A gas spring (30) is provided to move the pump (18) to maintain adequate pressure in the drug reservoir.

557525

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