US5013315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiabsorbable bone plate spacer
Assignee: 3M Co
•
Filing: 1985-07-12
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Granted: 1991-05-07
•
Expires: 2005-07-12
Abstract
Abstract A medical prosthesis for use in bone fracture fixation comprises a bone plate, a bone plate spacer comprising a blend or mixture of a nonabsorbable polymer and a bioabsorbable polymer, and a means for fastening both the bone plate and the bone plate spacer to the bone.
Inventors
- 👤 Thomas H. Barrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:57
CPC Classifications
C; C08; C08L; C08L77/00; A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/8028; A61L; A61L31/00; A61L31/04; A61L31/041; A61L31/14; A61L31/148; C08L77/02; A61B2017/00004
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
47 words
A medical prosthesis for; use in bone fracture fixation comprising a bone plate, a bone plate spacer comprising a blend or mixture of a nonabsorbable polymer and a bioabsorbable polymer, and a means for fastening both said bone plate and said bone plate spacer to the bone.
Claim 2
Dependent Claim
47 words
A medical prosthesis for; use in bone fracture fixation comprising a bone plate, a bone plate spacer comprising a blend or mixture of a nonabsorbable polymer and a bioabsorbable polymer, and a means for fastening both said bone plate and said bone plate spacer to the bone.
Claim 3
Dependent Claim
34 words
The prosthesis according to claim 1 wherein said bone plate spacer comprises a polymeric blend or mixture having in the range of 20 to 70 percent by weight of at least one bioabsorbable polymer.
Claim 4
Dependent Claim
28 words
The prosthesis according to claim 2 wherein said spacer comprises a polymeric blend or mixture having in the range of 40 to 60 percent by weight bioabsorbable polymer.
Claim 5
Dependent Claim
24 words
The prosthesis according to claim 1 further comprising voids in said nonabsorbable polymer after absorption which have an average diameter of 100micrometers or less.
Claim 6
Dependent Claim
18 words
The prosthesis according to claim 4 wherein said voids have an average diameter of 50 micrometers or less.
Claim 7
Dependent Claim
36 words
The prosthesis according to claim 1 wherein the bioabsorbable polymer of said bone plate spacer is selected from the group consisting of poly(ester-amides), poly(glycolic acid), poly(lactic acid), polydioxanone and poly(trimethylene carbonate) and copolymers and mixtures thereof.
Claim 8
Dependent Claim
23 words
The prosthesis according to claim 1 wherein the nonabsorbable polymer of said bone plate spacer is a polyurethane, a polyalkylene or a nylon.
Claim 9
Dependent Claim
17 words
The prosthesis according to claim 7 wherein said bioabsorbable polymer of said bone plate spacer is poly[oxysuccinoyloxyhexane-1,6-di(amidocarbonylmethylene)].
Claim 10
Dependent Claim
13 words
The prosthesis according to claim 1 wherein said fastening means is a screw.
Claim 11
Independent Claim
72 words
A method for bone fracture fixation comprising the steps of: a. providing a medical prosthesis comprising a bone plate, a bone plate spacer comprising a blend or mixture of a nonabsorbable polymer and a bioabsorbable polymer, and a means for fastening bone said bone plate and said bone plate spacer to said bone with said bone plate spacer adjacent said bone, and b. securing said prosthesis to said bone by fastening means.
Claim 12
Independent Claim
72 words
A method for bone fracture fixation comprising the steps of: a. providing a medical prosthesis comprising a bone plate, a bone plate spacer comprising a blend or mixture of a nonabsorbable polymer and a bioabsorbable polymer, and a means for fastening bone said bone plate and said bone plate spacer to said bone with said bone plate spacer adjacent said bone, and b. securing said prosthesis to said bone by fastening means.
Claim 13
Dependent Claim
16 words
The method according to claim 10 wherein said fastening means is a screw, rivet, or staple.
Claim 14
Dependent Claim
13 words
The method according to claim 11 wherein said fastening means is a screw.
Claim 15
Dependent Claim
34 words
The method according to claim 10 wherein said bone plate spacer comprises a polymeric blend or mixture having in the range of 20 to 70 percent by weight of at least one bioabsorbable polymer.
Claim 16
Dependent Claim
15 words
The method according to claim 13 wherein said range is 40 to 60 weight percent.
Claim 17
Dependent Claim
23 words
The method according to claim 10 wherein after absorption said bioabsorbable polymer has voids having an average diameter of 100 micrometers or less.
Claim 18
Dependent Claim
15 words
The method according to claim 15 wherein said average diameter is 50 micrometers or less.
Claim 19
Dependent Claim
31 words
The method according to claim 10 wherein said bone prosthesis provides at least 90 percent of normal bone porosity with or without plate removal after at least one year of healing.
Claim 20
Dependent Claim
29 words
The method according to claim 10 wherein the bioabsorbable polymer of said bone plate spacer is poly(ester-amide), poly(glycolic acid), poly(lactic acid), polydioxanone, poly(trimethylene carbonate) and copolymers or mixtures thereof.
Claim 21
Dependent Claim
23 words
The method according to claim 10 wherein said nonabsorbable polymer of said bone plate spacer is a polyurethane, a polyalkylene, or a nylon.
Claim 22
Dependent Claim
17 words
The method according to claim 19 wherein said bioabsorbable polymer of said bone plate spacer is poly[oxysuccinoyloxyhexane-1,6-di(amidocarbonylmethylene)].
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |