US4760849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planar blank and a coil spring manufactured therefrom
Assignee: AMS Medinvent SA
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Filing: 1986-03-31
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Granted: 1988-08-02
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Expires: 2006-03-31
Abstract
Abstract A planar blank is provided which permits the manufacture of a coil spring suitable for implantation. The blank has an elongated, essentially straight mid section which at its ends passes over into sections that are bent in the plane of the blank in opposite directions to form a blank having Z-shape. A coil spring made from the blank (in which the spring material as seen in cross section has radially flattened shape) at its ends has a lower pitch than the mid section or no pitch at all.
Inventors
- 👤 Laurent Kropf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:05
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/88; A61F2/02; A61F2/04; A61F2/01; A61F2/90; A61F2/91; A61F2002/016; A61F2230/00; A61F2230/0063; A61F2230/0091
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A coil spring for intraluminal implantation and having an essentially helix-shaped configuration, the spring material being radially flattened as seen in an axial cross section and comprising a mid section of circular cylindric shape and two integral end sections having, relative to the mid section, lower pitch, one end section consists of several turns which, in a direction perpendicular to the centre line of the coil spring, lie in essentially a common plane and which in a direction towards a free end of said one end section have a progressively decreasing radius of curvature.
Claim 2
Dependent Claim
94 words
A coil spring for intraluminal implantation and having an essentially helix-shaped configuration, the spring material being radially flattened as seen in an axial cross section and comprising a mid section of circular cylindric shape and two integral end sections having, relative to the mid section, lower pitch, one end section consists of several turns which, in a direction perpendicular to the centre line of the coil spring, lie in essentially a common plane and which in a direction towards a free end of said one end section have a progressively decreasing radius of curvature.
Claim 3
Dependent Claim
33 words
A coil spring according to claim 1, wherein the material of said one end section is axially tapering towards the free end so as to reduce axial flow resistance of the coil spring.
Claim 4
Dependent Claim
26 words
A coil spring according to claim 1, wherein the spring material over at least a major part of the spring is provided with radially through-going apertures.
Claim 5
Dependent Claim
27 words
A coil spring according to claim 3, wherein said apertures cover an area so that remaining spring material has a tangential width of at most 2.5 mm.
Claim 6
Dependent Claim
70 words
A coil spring for intraluminal implantation and having an essentially helix-shaped configuration, the spring material being radially flattened as seen in an axial cross section and comprising a midsection of circular cylindric shape and two integral end sections having relative to the midsection, lower pitch; wherein the material of the two end sections has essentially the same length, said length corresponding to less than a full turn of the spring.
Claim 7
Dependent Claim
70 words
A coil spring for intraluminal implantation and having an essentially helix-shaped configuration, the spring material being radially flattened as seen in an axial cross section and comprising a midsection of circular cylindric shape and two integral end sections having relative to the midsection, lower pitch; wherein the material of the two end sections has essentially the same length, said length corresponding to less than a full turn of the spring.
Claim 8
Dependent Claim
24 words
A coil spring according to claim 5, wherein said mid section is made from an axially smaller material than material of the end sections.
Claim 9
Dependent Claim
19 words
A coil spring according to claim 4, wherein the end sections each extend over less than about 3/4 turn.
Claim 10
Dependent Claim
19 words
A coil spring according to claim 5, wherein the end sections each extend over less than about 3/4 turn.
References Cited (Backward Citations)
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Cited
US1905103A
Cited
US4306318A
Cited
US4377280A
Cited
US4553545A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |