Electrochemical controlled dispensing assembly and method

Details Electrochemical controlled dispensing assembly and method Electrochemical controlled dispensing assembly and method

1994-02-01

1994-11-29

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604141, 604133, 128DIG12, A61M 3700

Patent

active

053685717

ABSTRACT:
A pump assembly (20) employs electrochemistry to selectively control the delivery rate of a dispensing fluid (21) from a dispensing reservoir (24) by selectively controlling the flow rate of a driving fluid (19) from a driving reservoir (23) to a receiving reservoir (33). A partition (25), separating the driving reservoir from the receiving fluid reservoir, includes at least one aperture (28) which is opened or closed depending upon an electrical signal from a remote programming unit. Flow into the receiving reservoir deflects a barrier member to expel dispensing fluid from the dispensing reservoir. The dispensing fluid flow rate can be programmed to provide an appropriate steady or varying flow rate; user-initiated pulses of dispensing fluid can also be provided. A method of controlled infusion of an infusate employing electrochemistry is also provided.

REFERENCES:
patent: 4687423 (1987-08-01), Maget
patent: 4874500 (1989-10-01), Madou
patent: 4886514 (1989-12-01), Maget
patent: 4902278 (1990-02-01), Maget et al.
patent: 5090963 (1992-02-01), Gross
patent: 5223265 (1993-06-01), Wong
Espenscheid, Mark W. and Martin, Charles R. "Electroactive Ion Exchange Polymers", J. Electroanal. Chem. 188 (1985) pp. 73-84.
McCarty, Lyle H. "A Valve on a Chip!," Design News, Jan. 20, 1992, pp. 111-112.

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