US4292693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking bail stapedial prosthesis
Assignee: Richards Manufacturing Co LP
•
Filing: 1979-10-05
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Granted: 1981-10-06
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Expires: 1999-10-05
Abstract
Abstract An improvement in bail-and-bucket, piston-type stapedial prostheses in which the bail is pivotally mounted to rotate about the open end of the bucket. Means are provided on the bucket for permitting overcenter pivotal movement of the bail in one direction and thereafter preventing overcenter pivotal movement of the bail in the opposite direction. The preferred means for accomplishing this function is an opposed pair of cam surfaces mounted on the bucket.
Inventors
- 👤 John J. Shea
- 👤 Calvin Griggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/18; A61F2002/183
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
In a prosthesis for replacing the stapes of the middle ear, said prosthesis being of the piston type and having a bucket end portion for receiving a portion of the lenticular process of the incus and a bail mounted to pivot about the open end of said bucket portion, the improvement comprising: means mounted on said bucket portion for permitting overcenter pivotal movement of said bail in one direction and thereafter preventing overcenter pivotal movement of said bail in the opposite direction.
Claim 2
Dependent Claim
82 words
In a prosthesis for replacing the stapes of the middle ear, said prosthesis being of the piston type and having a bucket end portion for receiving a portion of the lenticular process of the incus and a bail mounted to pivot about the open end of said bucket portion, the improvement comprising: means mounted on said bucket portion for permitting overcenter pivotal movement of said bail in one direction and thereafter preventing overcenter pivotal movement of said bail in the opposite direction.
Claim 3
Dependent Claim
32 words
The improvement recited in claim 1 wherein: said means for permitting and thereafter preventing said overcenter pivotal movement of said bail includes at least one cam surface mounted on said bucket portion.
Claim 4
Dependent Claim
54 words
The improvement recited in claim 2 wherein: said cam surface tapers outwardly from the surface of said bucket portion in the direction said overcenter pivotal movement of said bail is permitted and terminates in an inwardly extending shoulder portion which engages said bail to prevent said overcenter pivotal movement thereof in the opposite direction.
Claim 5
Dependent Claim
17 words
The improvement recited in claim 3 wherein: there is present an opposed pair of said cam surfaces.
Claim 6
Dependent Claim
44 words
The improvement recited in claim 4 wherein: the portion of said bail that pivots about said bucket portion is a resilient, U-shaped member adapted to deform for passage over said tapered cam surfaces and resumes its shape for said engagement against said shoulder portions.
Claim 7
Dependent Claim
28 words
The improvement recited in claim 1 wherein: said bucket portion includes a rim defining said open end of said bucket portion, said rim having an inwardly extending opening.
Claim 8
Dependent Claim
13 words
The improvement recited in claim 6 wherein: said inwardly extending opening is arcuate-shaped.
Claim 9
Dependent Claim
29 words
The improvement recited in claim 1 wherein: said bucket portion includes a radially extending bore adapted to receive the end of a surgical instrument for manipulation of said prosthesis.
References Cited (Backward Citations)
SU204496A1
Cited
US987579A
Cited
US1681587A
Cited
US3196462A
Cited
US3800934A
Cited
US3711869A
Cited
US3931648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |