Implantable piezoelectric pump system
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United States of America Patent
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Jul 31, 1990
Grant Date -
N/A
app pub date -
Nov 22, 1988
filing date -
Jan 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dispensing device for use in an implantable drug delivery system for ambulatory patients comprises a pump in a drug reservoir and a piezoelectric disc element bonded to a diaphragm member forming one wall of a pump chamber and a battery and electrical circuits for cyclically applying electrical voltage to the piezoelectric member for inducing pumping movement in the diaphragm member to pump drugs from a reservoir via a valve and to a delivery catheter via another valve. A gas spring is provided to move the pump to maintain adequate pressure in the drug reservoir.
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