US5755793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizer for a prosthetic implant
Assignee: Zimmer Technology Inc
•
Filing: 1996-09-04
•
Granted: 1998-05-26
•
Expires: 2016-09-04
Abstract
Abstract A centralizer 10 for positioning against a prosthetic implant 1. The centralizer 10 includes a plurality of inner raised ribs 15 extending from the inner surface 13 of the centralizer 10. The inner ribs 15 provide inner recessed pathways 16 which extend from the distal edge 12 toward the proximal edge 11. The centralizer 10 also may include a plurality of outer raised ribs 17. The inner and outer ribs 15 and 17 space the centralizer 10 from the implant 1 and the bone 5. This allows bone cement to flow into the gaps created between centralizer and the implant and between the centralizer and the bone.
Inventors
- 👤 William C. Smith
- 👤 Kevin M. Greig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30734; A61F2/30724; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30158; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2002/30594; A61F2002/30617; A61F2002/30738; A61F2/30771; A61F2002/30878; A61F2002/30879; A61F2002/30891; A61F2/30907; A61F2002/30919; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2002/4631; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0026; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0097; A61F2310/00; A61F2310/00389; A61F2310/00952
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
119 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs are aligned with the inner ribs.
Claim 2
Dependent Claim
119 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs are aligned with the inner ribs.
Claim 3
Dependent Claim
12 words
The combination of claim 1 wherein the inner ribs are elongated ribs.
Claim 4
Dependent Claim
27 words
The combination of claim 2 wherein the inner elongated ribs extend from about the distal edge of the centralizer to about the proximal edge of the centralizer.
Claim 5
Dependent Claim
12 words
The combination of claim 1 wherein the outer ribs are elongated ribs.
Claim 6
Dependent Claim
27 words
The combination of claim 4 wherein the outer elongated ribs extend from about the distal edge of the centralizer to about the proximal edge of the centralizer.
Claim 7
Dependent Claim
19 words
The combination of claim 1 wherein the centralizer includes a first side with two oppositely located sides connected thereto.
Claim 8
Dependent Claim
30 words
The combination of claim 1 wherein the centralizer includes a fourth side oppositely located from the first side and extending between the two oppositely located sides forming an enclosed ring.
Claim 9
Dependent Claim
17 words
The combination of claim 1 wherein the inner ribs extend about one millimeter from the inner surface.
Claim 10
Dependent Claim
85 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the distal edge is not parallel to the proximal edge.
Claim 11
Dependent Claim
85 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the distal edge is not parallel to the proximal edge.
Claim 12
Dependent Claim
82 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer is made from an acrylic polymer.
Claim 13
Dependent Claim
82 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and an outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer is made from an acrylic polymer.
Claim 14
Dependent Claim
120 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs extend about one millimeter from the outer surface.
Claim 15
Dependent Claim
120 words
In combination, a prosthetic implant and a centralizer for positioning against the implant, the centralizer having a proximal edge and a distal edge, and an inner surface and outer surface wherein a plurality of inner raised ribs extend from the inner surface of the centralizer to space the centralizer away from the implant, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs extend about one millimeter from the outer surface.
Claim 16
Dependent Claim
109 words
A centralizer for positioning against a prosthetic implant, wherein the centralizer has a proximal edge and a distal edge, and an inner surface and an outer surface, and wherein a plurality of inner raised ribs extend from the inner surface of the centralizer, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer further includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs are aligned with the inner ribs.
Claim 17
Dependent Claim
109 words
A centralizer for positioning against a prosthetic implant, wherein the centralizer has a proximal edge and a distal edge, and an inner surface and an outer surface, and wherein a plurality of inner raised ribs extend from the inner surface of the centralizer, the inner ribs providing inner recessed pathways therebetween which extend from the distal edge toward the proximal edge, and wherein the centralizer further includes a plurality of outer raised ribs extending from the outer surface of the centralizer, the outer ribs providing outer recessed pathways therebetween extending from the distal edge toward the proximal edge, and wherein the outer ribs are aligned with the inner ribs.
Claim 18
Dependent Claim
30 words
The centralizer of claim 12 wherein the inner ribs are elongated ribs which extend from about the distal edge of the centralizer to about the proximal edge of the centralizer.
Claim 19
Dependent Claim
30 words
The centralizer of claim 12 wherein the outer ribs are elongated ribs which extend from about the distal edge of the centralizer to about the proximal edge of the centralizer.
Claim 20
Independent Claim
115 words
A method for centralizing a prosthetic implant relative to a bone surface comprising: a) providing the prosthetic implant with an elongated stem portion; b) providing a centralizer with a plurality of inner raised ribs extending from an inner surface of the centralizer; c) positioning the centralizer about the elongated stem, such that the inner ribs cause the inner surface of the centralizer to be spaced from the implant forming an inner gap therebetween; and d) then subsequently inserting the implant and centralizer into a bone cavity already filled with a bone cement such that the bone cement flows into the inner gap between the implant and the inner surface of the centralizer upon such insertion.
Claim 21
Independent Claim
115 words
A method for centralizing a prosthetic implant relative to a bone surface comprising: a) providing the prosthetic implant with an elongated stem portion; b) providing a centralizer with a plurality of inner raised ribs extending from an inner surface of the centralizer; c) positioning the centralizer about the elongated stem, such that the inner ribs cause the inner surface of the centralizer to be spaced from the implant forming an inner gap therebetween; and d) then subsequently inserting the implant and centralizer into a bone cavity already filled with a bone cement such that the bone cement flows into the inner gap between the implant and the inner surface of the centralizer upon such insertion.
Claim 22
Dependent Claim
69 words
The method of claim 15 further comprising providing the centralizer with a plurality of outer ribs extending from an outer surface of the centralizer in order to space the outer surface of the centralizer from the bone surface to form an outer gap therebetween, such that upon the insertion step, the bone cement flows into the outer gap between the bone surface and the outer surface of the centralizer.
Claim 23
Dependent Claim
60 words
The method of claim 15 further comprising providing a polymer coating on the implant, such that the positioning step further provides for positioning the centralizer about the stem adjacent the polymer coating such that upon inserting the implant, the bone cement flows into the inner gap between the polymer coating on the implant and the inner surface of the centralizer.
Claim 24
Independent Claim
116 words
A method for centralizing a prosthetic implant relative to a bone surface comprising: a) providing the prosthetic implant with an elongated stem portion; b) providing a centralizer with a plurality of inner raised ribs extending from an inner surface of the centralizer; c) positioning the centralizer about the elongated stem, such that the inner ribs cause the inner surface of the centralizer to be spaced from the implant forming an inner gap therebetween; and d) inserting the implant into a bone cavity filled with a bone cement such that the bone cement flows into the inner gap between the implant and the inner surface of the centralizer, and e) manufacturing the centralizer from an acrylic polymer.
Claim 25
Independent Claim
116 words
A method for centralizing a prosthetic implant relative to a bone surface comprising: a) providing the prosthetic implant with an elongated stem portion; b) providing a centralizer with a plurality of inner raised ribs extending from an inner surface of the centralizer; c) positioning the centralizer about the elongated stem, such that the inner ribs cause the inner surface of the centralizer to be spaced from the implant forming an inner gap therebetween; and d) inserting the implant into a bone cavity filled with a bone cement such that the bone cement flows into the inner gap between the implant and the inner surface of the centralizer, and e) manufacturing the centralizer from an acrylic polymer.
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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) | 2001-05-25 | 2001-11-24 | 2002-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-25 | 2005-11-24 | 2006-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-25 | 2009-11-24 | 2010-05-26 | $7700.00 | Window Closed / Lapsed |