US5643246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically triggered, responsive gel based drug delivery device
Assignee: Medlogic Global Ltd
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Filing: 1995-02-24
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Granted: 1997-07-01
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Expires: 2015-02-24
Abstract
Abstract A system for remotely inducing a phase transition in a gel is provided. The system includes a gel capable of volume change in response to an environmental stimulus, a seed material in contact with the gel, and generating a time-varying magnetic or a time-varying electric or electromagnetic field in the proximity of the gel to produce the environmental stimulus. In a preferred embodiment, the environmental stimulus is temperature.
Inventors
- 👤 Steven B. Leeb
- 👤 E. C. Lupton
- 👤 Xiaohong Yu
- 👤 George Hovorka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:01
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0002; A61K9/0009
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said time-varying electric field comprises a quasi-static electric field.
Claim 2
Independent Claim
102 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said time-varying electric field comprises a quasi-static electric field.
Claim 3
Independent Claim
107 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said electric receptor is selected from the group consisting of waxes, mica and polyester.
Claim 4
Independent Claim
107 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said electric receptor is selected from the group consisting of waxes, mica and polyester.
Claim 5
Independent Claim
114 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said electric receptor is in the form selected from the group consisting of film, rod, particle, fluid, glass-encased particle and bead.
Claim 6
Independent Claim
114 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; a seed material in contact with said gel, said seed material selected from the group consisting of a magnetic receptor, an electric receptor and an electromagnetic receptor; and means for producing said environmental stimulus in proximity to said gel, said means selected from the group consisting of means for generating a time-varying magnetic field, means for generating a time-varying electric field and means for generating an electromagnetic field; wherein said electric receptor is in the form selected from the group consisting of film, rod, particle, fluid, glass-encased particle and bead.
Claim 7
Independent Claim
51 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; an electric receptor in contact with said gel; and means for generating a quasi-static time-varying electric field in proximity to said gel to produce said environmental stimulus.
Claim 8
Independent Claim
51 words
A system for remotely inducing a phase transition in a gel, comprising: a gel capable of volume change in response to an environmental stimulus; an electric receptor in contact with said gel; and means for generating a quasi-static time-varying electric field in proximity to said gel to produce said environmental stimulus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |