Patent US4842598A successfully refreshed from Google Patents.
US4842598A
Expired / Lapsed
US
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Therapeutic agent delivery system and method
Assignee: Controlled Release Technologies Inc
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Filing: 1987-12-24
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Granted: 1989-06-27
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Expires: 2007-12-24
Abstract
Abstract A method and apparatus for controllably administering a therapeutic agent to a patient is disclosed. The method and apparatus uses an electromotive force between an anode and a cathode to cause the therapeutic agent to migrate through a semipermeable membrane. The therapeutic agent is then delivered to the patient.
Inventors
- 👤 Loi H. Tran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:26
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/1407
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A therapeutic agent delivery system comprising: a housing retaining a semipermeable membrane and together with the membrane defining a donor chamber adapted to hold the therapeutic agent, the membrane being made of a material that is substantially impermeable to the therapeutic agent in an ionic form; an anode and a cathode exposed within the donor chamber such that an electromotive force between the anode and the cathode will alter the electrical charge of the therapeutic agent to permit the agent to pass through the membrane.
Claim 2
Dependent Claim
85 words
A therapeutic agent delivery system comprising: a housing retaining a semipermeable membrane and together with the membrane defining a donor chamber adapted to hold the therapeutic agent, the membrane being made of a material that is substantially impermeable to the therapeutic agent in an ionic form; an anode and a cathode exposed within the donor chamber such that an electromotive force between the anode and the cathode will alter the electrical charge of the therapeutic agent to permit the agent to pass through the membrane.
Claim 3
Dependent Claim
17 words
The therapeutic agent delivery system of claim 1 including power source means for generating the electromotive force.
Claim 4
Dependent Claim
23 words
The therapeutic agent delivery system of claim 2 including control means for controlling the electromotive force generated by power source means over time.
Claim 5
Dependent Claim
19 words
The therapeutic agent delivery system of claim 3 wherein the system is adapted for implantation in a living body.
Claim 6
Dependent Claim
17 words
The therapeutic agent delivery system of claim 1 wherein the membrane is made of a hydrophobic material.
Claim 7
Dependent Claim
20 words
The therapeutic agent delivery system of claim 1 including a therapeutic agent received in the chamber in its ionic form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |