Patent US4197840A successfully refreshed from Google Patents.
US4197840A
Expired / Lapsed
US
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Permanent magnet device for implantation
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1976-09-29
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Granted: 1980-04-15
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Expires: 1996-09-29
Abstract
Abstract A permanent magnet device for implantation in the eyelids including at least two magnet bodies enclosed in substantially shape-dependent manner by an enveloping body consisting of a ductile, tissue-compatible material, the enveloping body being substantially gastight and having at least one constriction in the radial direction.
Inventors
- 👤 Alexander Beck
- 👤 Jean-Marcel Piffaretti
- 👤 Dietmar Weinmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:44
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0205; H01F7/0221; A; A61; A61F; A61F9/00; A61F9/007; A61F9/00718; A61F2210/00; A61F2210/009
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
82 words
A permanent magnet device adapted for implantation in the eyelids comprising: at least two magnet bodies; at least one spacer arranged between the magnet bodies; and a separate enveloping body of ductile, tissue-compatible material enclosing and clinging to the magnet bodies, said enveloping body also enclosing said at least one spacer and having at least one constriction in the radial direction located at each of said at least one spacer; whereby said magnet device may hold said eyelids in a desired position.
Claim 2
Dependent Claim
82 words
A permanent magnet device adapted for implantation in the eyelids comprising: at least two magnet bodies; at least one spacer arranged between the magnet bodies; and a separate enveloping body of ductile, tissue-compatible material enclosing and clinging to the magnet bodies, said enveloping body also enclosing said at least one spacer and having at least one constriction in the radial direction located at each of said at least one spacer; whereby said magnet device may hold said eyelids in a desired position.
Claim 3
Dependent Claim
16 words
The permanent magnet device according to claim 1 wherein: the magnet bodies are rare earth-cobalt alloys.
Claim 4
Dependent Claim
25 words
The permanent magnet device according to claim 1 wherein: the enveloping body is tubular and closed at the ends and has a substantially rectangular cross-section.
Claim 5
Dependent Claim
25 words
The permanent magnet device according to claim 1 wherein: the enveloping body is tubular and closed at the ends and has a substantially elliptical cross-section.
Claim 6
Dependent Claim
13 words
The permanent magnet device according to claim 1, wherein: the spacer is resilient.
Claim 7
Dependent Claim
36 words
The permanent magnet device according to claim 1 wherein: the enveloping body consists of a metallic material selected from the group consisting of gold, silver, platinum, rhodium, ruthenium, palladium, iridium and their alloys of stainless steel.
Claim 8
Dependent Claim
15 words
The permanent magnet device according to claim 1 wherein: the enveloping body has end lobes.
Claim 9
Dependent Claim
14 words
The permanent magnet device according to claim 7 wherein: the end lobes are perforated.
Claim 10
Dependent Claim
31 words
The permanent magnet device according to claim 1 wherein: the enveloping body has at least one closure in the shape of a rounded projection on one part of its longitudinal side.
Claim 11
Dependent Claim
18 words
The permanent magnet device according to claim 1 including: a second tissue-compatible protective layer covering the magnet bodies.
Claim 12
Dependent Claim
20 words
The permanent magnet device according to claim 1 wherein: the enveloping body is constructed at least partly in net form.
Claim 13
Dependent Claim
22 words
The permanent magnet device according to claim 1 wherein: the enveloping body is covered with a net consisting of a tissue-compatible material.
Claim 14
Dependent Claim
29 words
The permanent magnet device according to claim 1 wherein: the enveloping body is constructed at least partly in net form and is covered with a net of tissue-compatible material.
Claim 15
Dependent Claim
15 words
The permanent magnet device according to claim 1 wherein: the enveloping body is approximately gastight.
References Cited (Backward Citations)
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US3794041A
Cited
US3752162A
Cited
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Cited
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Cited
FR2278314A1
Cited
US4005699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |