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US5348026A
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Osteoinductive bone screw
Assignee: Smith and Nephew Inc
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Filing: 1992-09-29
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Granted: 1994-09-20
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Expires: 2012-09-29
Abstract
Abstract A bone screw and its method of manufacturing provides a low modulus osteoinductive bone screw with a high resistance to insertion torquing. The method includes the steps of pre-torquing a plurality of reinforcing fibers, molding a polymer matrix to bond with the pre-torqued fibers, and wherein the screw apparatus is coated with an osteoinductive material such as BMP, growth factors, hydroxyapatite or calcium phosphate.
Inventors
- 👤 James A. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2/30965; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/866; A61L; A61L31/00; A61L31/08; A61L31/082; A61L31/086; A61L31/12; A61L31/125; A61L31/129; A61F2/30767; A61L2430/00; A61L2430/02; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
92 words
A method of manufacturing a low modulus bone screw with a high resistance to insertion torque, comprising the steps of: a) pre-torquing a plurality of reinforcing fibers; b) molding a bone screw shaped polymer matrix that includes a shank portion with a helical thread thereon to bond with the pre-torqued fibers; c) wherein the fibers are wound in a direction that orients the fibers to resist insertion torque applied to the bone screw; and d) wherein in step b) a body is formed having a size and shape of a bone screw.
Claim 2
Independent Claim
92 words
A method of manufacturing a low modulus bone screw with a high resistance to insertion torque, comprising the steps of: a) pre-torquing a plurality of reinforcing fibers; b) molding a bone screw shaped polymer matrix that includes a shank portion with a helical thread thereon to bond with the pre-torqued fibers; c) wherein the fibers are wound in a direction that orients the fibers to resist insertion torque applied to the bone screw; and d) wherein in step b) a body is formed having a size and shape of a bone screw.
Claim 3
Dependent Claim
17 words
The method of claim 1 further comprising the step of coating the body with an osteoinductive material.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the body has an elongated shaft with an enlarged head at one end portion of the shaft.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the osteoinductive material is hydroxyapatite.
Claim 6
Dependent Claim
12 words
The method of claim 2 wherein the osteoinductive material is calcium phosphate.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein the modulus of elasticity of the formed low modulus bone screw is between about six and fifty GPa.
Claim 8
Dependent Claim
22 words
The method of claim 2 wherein in step c, the osteoinductive material is bonded to the outer surface portion of the body.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein in step "b" the polymer matrix is a biocompatable high strength fiber and polymer matrix.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein in step "a" the fibers are preliminarily aligned in a uniaxial direction.
Claim 11
Dependent Claim
15 words
The method of claim 9 wherein in step "b" the polymer is a self-curing polymer.
Claim 12
Dependent Claim
16 words
The method of claim 9 wherein in step "b" the polymer is a heat curing polymer.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein in step "b" the polymer is a thermoplastic powder.
Claim 14
Dependent Claim
17 words
The method of claim 9 wherein in step "b" thermoplastic fibers are co-mingled with the aligned fibers.
Claim 15
Dependent Claim
18 words
The method of claim 1 further comprising the step of forming polymeric threads on the bone screw body.
Claim 16
Dependent Claim
20 words
The method of claim 1 further comprising the step of forming fiber reinforced polymer threads on the bone screw body.
Claim 17
Dependent Claim
21 words
The method of claim 9 further comprising the step of forming a fiber reinforced head portion on the bone screw body.
Claim 18
Dependent Claim
16 words
The method of claim 16 wherein the fiber reinforced head portion includes circumferentially wound fiber reinforcement.
Claim 19
Dependent Claim
17 words
The method of claim 9 further comprising the step of coating the screw with an osteoinductive coating.
Claim 20
Independent Claim
19 words
The method of claims 1 or 17 further comprising the step of coating the screw with a porous coating.
Claim 21
Dependent Claim
20 words
The method of claim 1 or 9 wherein the fibers are torqued before molding or curing of the polymer matrix.
Claim 22
Dependent Claim
12 words
A bone screw article formed according to the method of claim 1.
Claim 23
Dependent Claim
10 words
The method of claim 1 wherein the polymer is nonresorbable.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |