Surgery – Controlled release therapeutic device or system – Implanted dynamic device or system
Patent
1994-04-22
1996-04-16
Yasko, John D.
Surgery
Controlled release therapeutic device or system
Implanted dynamic device or system
604 93, 604118, 128DIG13, 128903, A61M 1100, A61M 100, A61K 922
Patent
active
055077374
ABSTRACT:
In a method and apparatus for determining the volume of a bellows reservoir for medication in an infusion system which is implantable in a patient, the pressure in the reservoir is measured and the corresponding volume is determined from a predetermined relationship between pressure and volume. A pressure gauge is disposed for measuring the pressure in the bellows reservoir, and a signal corresponding to the measured pressure is supplied to a memory unit wherein a corresponding volume is determined from the measured pressure value by means of the predetermined relationship between pressure and volume being stored in the memory unit.
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Cermak Adam J.
Siemens Elema AB
Yasko John D.
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