US3718142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically shielded, gas-permeable implantable electro-medical apparatus
Assignee: Medtronic Inc
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Filing: 1971-04-23
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Granted: 1973-02-27
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Expires: 1991-04-23
Abstract
Abstract A thin film of metal, deposited on an implantable cardiac stimulator, acting as a shield to prevent interference with the electronic circuitry of the stimulator, the interference produced by any outside apparatus which might induce RF interference on electrodes from the stimulator to the heart, or through the living tissue to the stimulator body itself. Also, before implantation, because of a variety of very well-known reasons, a static charge that may have been built up on the stimulator is avoided because of the deposited shielding.
Inventors
- 👤 P Mulier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/375
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
In an implantable stimulator of the type having electronic circuitry and gas generating battery means all encased in a material having a substantially higher permeability to battery gas than body fluids, and at least one electrode, the improvement which comprises: film means covering said encasing material for allowing the escape of battery gases from said encasing material while preventing the passage of substantial amounts of body fluids therethrough, said film means comprising a thin film of metal capable of shielding the electronic circuitry from extraneous interference signals.
Claim 2
Dependent Claim
87 words
In an implantable stimulator of the type having electronic circuitry and gas generating battery means all encased in a material having a substantially higher permeability to battery gas than body fluids, and at least one electrode, the improvement which comprises: film means covering said encasing material for allowing the escape of battery gases from said encasing material while preventing the passage of substantial amounts of body fluids therethrough, said film means comprising a thin film of metal capable of shielding the electronic circuitry from extraneous interference signals.
Claim 3
Dependent Claim
20 words
The implantable stimulator of claim 1 wherein said battery gas escape is accomplished through a rupture in the film means.
Claim 4
Dependent Claim
32 words
The implantable stimulator of claim 2 further comprising an electronic filter means connected between each electrode and the film means for shunting interference signals impressed on the electrode to the film means.
Claim 5
Dependent Claim
25 words
The implantable stimulator of claim 3 wherein the filter means comprises a capacitor providing a direct AC connection between the electrodes and the film means.
Claim 6
Dependent Claim
15 words
The stimulator of claim 4 wherein the thin film of metal is deposited by sputtering.
Claim 7
Dependent Claim
14 words
The stimulator of claim 4 wherein the thin film is deposited by evaporation deposition.
Claim 8
Dependent Claim
25 words
The implantable stimulator of claim 1 wherein said film means has a plurality of pinholes therein, said battery gas escape being accomplished through the pinholes.
Claim 9
Dependent Claim
32 words
The implantable stimulator of claim 7 further comprising an electronic filter means connected between each electrode and the film means for shunting interference signals impressed on the electrode from the film means.
Claim 10
Dependent Claim
25 words
The implantable stimulator of claim 8 wherein the filter means comprises a capacitor providing a direct AC connection between the electrodes and the film means.
Claim 11
Dependent Claim
13 words
The stimulator of claim 9, wherein the thin film is deposited by sputtering.
Claim 12
Dependent Claim
14 words
The stimulator of claim 9, wherein the thin film is deposited by evaporation deposition.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |