Accumulator for implantable pump

Details Accumulator for implantable pump Accumulator for implantable pump

1992-09-18

1994-01-25

Hirsch, Paul J.

Surgery

Controlled release therapeutic device or system

Implanted dynamic device or system

604141, A61M 3100

Patent

active

052812103

ABSTRACT:
An accumulator for an implantable infusion system employs a pair of separated diaphragms movable in unison by a transfer fluid disposed therebetween. A first chamber receives infusate in metered amounts and dispenses the contents as a function of toggled valve operation. During filling, the first diaphragm deflects upward and by pressure transfer causes a corresponding deflection in the second diaphragm. The second diaphragm is biased by springs, gas under pressure or the like. Hence, when the outlet valve opens, the pressure differential across the diaphragm causes downward deflection. No mechanical stops are needed in the infusate chamber for the first diaphragm since its movement is controlled by the pressure differential across the second diaphragm.

REFERENCES:
patent: 4299220 (1981-11-01), Dorman
patent: 4668231 (1987-05-01), de Vries et al.
patent: 4699615 (1987-10-01), Fischell et al.
patent: 4820273 (1989-04-01), Reinicke
patent: 4838887 (1989-06-01), Idriss
patent: 4969873 (1990-11-01), Steinbach et al.
patent: 5049141 (1991-09-01), Olive
patent: 5053031 (1991-10-01), Borsanyl
patent: 5090963 (1992-02-01), Gross et al.
patent: 5137529 (1992-08-01), Watson et al.

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