Programmable implantable infusate pump

Details Programmable implantable infusate pump Programmable implantable infusate pump

1982-09-09

1984-04-17

Kamm, William E.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

128DIG12, 128DIG13, A61M 514

Patent

active

044432186

ABSTRACT:
A programmable implantable infusion pump includes a housing containing a variable volume infusate chamber and variable volume control fluid pressure and displacement reservoirs. A conduit conducts infusate from the chamber exteriorly of the housing. A restricted fluid path exists between the two reservoirs which are filled with an incompressible control fluid. A loaded spring applies a constant force to the pressure reservoir causing fluid flow between the two reservoirs. The differential pressure across the flow restriction is sampled by a microprocessor which computes the fluid flow rate, that rate being proportional to the infusate flow rate from the chamber. When the fluid flow rate deviates from a programmed value, the processor issues an error command to a battery-driven motor which reloads the spring to reestablish the constant force on the pressure reservoir. The infusate flow rate may be changed automatically during the day in accordance with a programmed schedule and that schedule may be changed by reprogramming the processor using a telemetry receiver contained in the housing.

REFERENCES:
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patent: 3731681 (1973-05-01), Blackshear et al.
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patent: 4237900 (1980-12-01), Schulman et al.
patent: 4274444 (1981-06-01), Ruyak
patent: 4350647 (1982-09-01), de la Cruz
patent: 4364276 (1982-12-01), Shimazoe et al.
patent: 4376523 (1983-03-01), Goyew

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