US6602293B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric composite orthopedic implant
Assignee: Johns Hopkins University
•
Filing: 1996-11-01
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Granted: 2003-08-05
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Expires: 2016-11-01
Abstract
Abstract An orthopedic implant comprising a thermoplastic polymer or a composite comprising, in one embodiment, polyetheretherketone reinforced with 10% by volume of glass fibers, with an elastic modulus approximating the elastic modulus of bone. A porous coating is formed on the implant surface by creating a roughness thereon, by coating the surface with hydroxyapatite or by embedding a biocompatible material such as titanium in the surface. A two piece embodiment of the implant is joined and locked together, after the opposite ends of each piece are inserted in the medullary canal, using an interlocking mechanism comprising a fluted protrusion on one piece and a corresponding fluted cavity in the other piece with the fluted portions being complementarily tapered.
Inventors
- 👤 Paul J. Biermann
- 👤 Jack C. Roberts
- 👤 Amy A. Corvelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61F2/30; A61F2/30767; A61F2/30771; A61F2/3094; A61F2/30965; A61F2/46; A61F2/468; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30065; A61F2002/30108; A61F2002/3011; A61F2002/30159; A61F2002/30171; A61F2002/30199; A61F2002/30224; A61F2002/30289; A61F2002/30316; A61F2002/30317; A61F2002/30321; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30448; A61F2002/3082; A61F2002/30878; A61F2002/30906; A61F2002/30925; A61F2/30942; A61F2002/30955; A61F2002/30957; A61F2002/30975; A61F2210/00; A61F2210/0071; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/005; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/005; A61F2230/0063; A61F2230/0069; A61F2230/0091; A61F2250/00; A61F2250/0014; A61F2250/0025; A61F2310/00; A61F2310/00389; A61F2310/00395; A61F2310/00407; A61F2310/00592; A61F2310/00796; Y; Y10; Y10S; Y10S606/00; Y10S606/907; Y10S606/91
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
111 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising: a thermoplastic polymer having an elastic modulus approximating the elastic modulus of bone; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity.
Claim 2
Dependent Claim
111 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising: a thermoplastic polymer having an elastic modulus approximating the elastic modulus of bone; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity.
Claim 3
Dependent Claim
101 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising: a thermoplastic polymer having an elastic modulus approximating the elastic modulus of bone; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member, wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces.
Claim 4
Dependent Claim
101 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising: a thermoplastic polymer having an elastic modulus approximating the elastic modulus of bone; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member, wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces.
Claim 5
Dependent Claim
32 words
The implant as recited in claim 2 , wherein the end opposite the protruding member on the first piece and the end opposite the cavity on the second piece are both fluted.
Claim 6
Dependent Claim
107 words
An intramedullary implant for replacing a missing or diseased portion of bone comprising: a first piece comprising a first end for insertion into the medullary cavity of a bone and a second end having a protruding member thereon; a second piece comprising a first end for insertion into the medullary cavity of a bone and a second end having a cavity formed therein for receiving the protruding member on the second end of the first piece; and means for resisting rotation between the first and second pieces; wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity.
Claim 7
Dependent Claim
107 words
An intramedullary implant for replacing a missing or diseased portion of bone comprising: a first piece comprising a first end for insertion into the medullary cavity of a bone and a second end having a protruding member thereon; a second piece comprising a first end for insertion into the medullary cavity of a bone and a second end having a cavity formed therein for receiving the protruding member on the second end of the first piece; and means for resisting rotation between the first and second pieces; wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity.
Claim 8
Dependent Claim
29 words
The intramedullary implant as recited in claim 4 , wherein the fluted protruding member of the first piece and the fluted cavity of the second piece are complementarily tapered.
Claim 9
Dependent Claim
21 words
The intramedullary implant as recited in claim 5 , wherein the first ends of the first and second pieces are fluted.
Claim 10
Dependent Claim
20 words
The intramedullary implant as recited in claim 5 , further comprising a porous coating on a surface of the implant.
Claim 11
Dependent Claim
15 words
The intramedullary implant as recited in claim 7 , wherein the porous coating comprises hydroxyapatite.
Claim 12
Dependent Claim
23 words
The intramedullary implant as recited in claim 7 , wherein the porous coating comprises a roughness formed on the surface of the implant.
Claim 13
Dependent Claim
25 words
The intramedullary implant as recited in claim 7 , wherein the porous coating comprises a biocompatible material partially embedded in the surface of the implant.
Claim 14
Dependent Claim
15 words
The intramedullary implant as recited in claim 10 , wherein the biocompatible material is titanium.
Claim 15
Dependent Claim
15 words
The intramedullary implant as recited in claim 11 , wherein the titanium comprises a coil.
Claim 16
Dependent Claim
28 words
The intramedullary implant as recited in claim 12 , wherein the coil is embedded to a depth of between ⅓ to ½ of the diameter of the coil.
Claim 17
Dependent Claim
21 words
The intramedullary implant as recited in claim 13 , wherein, prior to being embedded, the coil is wrapped around the implant.
Claim 18
Dependent Claim
36 words
The intramedullary implant as recited in claim 13 , wherein, after the coil is embedded in the surface of the implant, the interstices between the nonembedded portions of the coil range from 150 to 200 micrometers.
Claim 19
Dependent Claim
31 words
The intramedullary implant as recited in claims 4 , 7 , 10 , or 15 , further comprising a thermoplastic polymer having an elastic modulus approximating the elastic modulus of bone.
Claim 20
Dependent Claim
35 words
The intramedullary implant as recited in claims 4 , 7 , 10 or 15 further comprising a fiber reinforced polymer, wherein the fiber reinforced polymer has an elastic modulus approximating the elastic modulus of bone.
Claim 21
Dependent Claim
15 words
The intramedullary implant as recited in claim 17 , wherein the polymer comprises polyetheretherketone (PEEK).
Claim 22
Dependent Claim
15 words
The intramedullary implant as recited in claim 18 , wherein the reinforcing fiber comprises glass.
Claim 23
Dependent Claim
20 words
The intramedullary implant as recited in claim 19 , wherein the glass fibers comprise 10% of the implant by volume.
Claim 24
Dependent Claim
123 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: a thermoplastic polymer; a material for reinforcing the polymer; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 25
Dependent Claim
123 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: a thermoplastic polymer; a material for reinforcing the polymer; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 26
Dependent Claim
132 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: polyetheretherketone (PEEK); glass fibers for reinforcing the polymer, the glass fibers comprising 10% of the implant by volume; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 27
Dependent Claim
132 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: polyetheretherketone (PEEK); glass fibers for reinforcing the polymer, the glass fibers comprising 10% of the implant by volume; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member; and means for resisting rotation between the first and second pieces, wherein the rotation resisting means comprises a flute on the protruding member and a corresponding fluted opening in the cavity; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 28
Dependent Claim
113 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: a thermoplastic polymer; a material for reinforcing the polymer; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 29
Dependent Claim
113 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: a thermoplastic polymer; a material for reinforcing the polymer; a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 30
Dependent Claim
123 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: polyetheretherketone (PEEK); glass fibers for reinforcing the polymer, the glass fibers comprising 10% of the implant by volume; and a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member, wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
Claim 31
Dependent Claim
123 words
An orthopedic implant for replacing a missing or diseased portion of bone, the implant comprising a composite comprising: polyetheretherketone (PEEK); glass fibers for reinforcing the polymer, the glass fibers comprising 10% of the implant by volume; and a biocompatible material partially embedded in a surface of the implant; a first piece and a second piece, the first and second pieces being joined and locked together by an interlocking means comprising: a protruding member on the first piece; and a cavity in the second piece for receiving the protruding member, wherein the protruding member and the cavity are complementarily tapered; and means for resisting rotation between the first and second pieces; wherein the composite has an elastic modulus approximating the elastic modulus of bone.
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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) | 2006-08-04 | 2007-02-03 | 2007-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-04 | 2011-02-03 | 2011-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-04 | 2015-02-03 | 2015-08-05 | $7700.00 | Window Closed / Lapsed |