US5129908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and instruments for resection of the patella
Assignee: Zimmer Technology Inc
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Filing: 1990-01-23
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Granted: 1992-07-14
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Expires: 2010-01-23
Abstract
Abstract Disclosed is a method of performing surgery to resect the patella for the purpose of installation of a patellar prosthesis, along with instruments used in such surgery. The instruments include a combined clamping device and reaming guide which when clamped about the patella provides a guide for reaming the surface thereof as well as a limit stop device designed to prevent reaming the patella too deeply. The instruments also include a reaming device designed to ream an annulus of material from the patella, leaving a central raised portion for fixation of a patellar prosthesis.
Inventors
- 👤 Thomas D. Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:41
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1675; A61B17/1677; A61B17/17; A61B17/1739; A61B17/1764; A61B17/1767; A61B17/28; A61B17/2812; A61B2017/1602; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
141 words
A patellar clamp/guide device, comprising: a) a first handle having a proximal end and a distal end, and a second handle having a proximal end and a distal end, said handles being coupled together for mutual pivoting movement; b) said first handle distal end including: i) a plate having at least one upstanding spike adapted to engage an anterior surface of a patella; and ii) guide means for guiding a plunger in reciprocatory movements; c) said second handle distal end being coupled with said plunger whereby pivoting movements of said handles with respect to one another cause movements of said plunger with respect to said guide means; d) a reamer guide removably attached to said plunger and including a guiding opening therethrough; and e) stop means for limiting spacing between said plate and said reamer guide to a desired minimum spacing.
Claim 2
Dependent Claim
141 words
A patellar clamp/guide device, comprising: a) a first handle having a proximal end and a distal end, and a second handle having a proximal end and a distal end, said handles being coupled together for mutual pivoting movement; b) said first handle distal end including: i) a plate having at least one upstanding spike adapted to engage an anterior surface of a patella; and ii) guide means for guiding a plunger in reciprocatory movements; c) said second handle distal end being coupled with said plunger whereby pivoting movements of said handles with respect to one another cause movements of said plunger with respect to said guide means; d) a reamer guide removably attached to said plunger and including a guiding opening therethrough; and e) stop means for limiting spacing between said plate and said reamer guide to a desired minimum spacing.
Claim 3
Dependent Claim
34 words
The invention of claim 1, further including locking means interposed between said proximal ends of said handles for locking said handles in any one of a multiplicity of positions with respect to one another.
Claim 4
Dependent Claim
23 words
The invention of claim 1, further including biasing means interposed between said handles and biasing said proximal ends thereof away from one another.
Claim 5
Dependent Claim
17 words
The invention of claim 1, wherein said at least one upstanding spike comprises a plurality of spikes.
Claim 6
Dependent Claim
20 words
The invention of claim 1, wherein said guide means comprises a substantially cylindrical passage adapted to slidably receive said plunger.
Claim 7
Dependent Claim
34 words
The invention of claim 1, wherein said reamer guide has an anatomically derived algorithm curved surface which articulates with a corresponding articular surface of said patella to correctly center and level said reamer guide.
Claim 8
Dependent Claim
16 words
The invention of claim 1, further including a drill guide detachably mountable in said guiding opening.
Claim 9
Dependent Claim
24 words
The invention of claim 1, wherein said stop means comprises a protrusion on said plunger adapted to engage a surface on said guide means.
Claim 10
Dependent Claim
11 words
The invention of claim 8, wherein said protrusion comprises a pin.
Claim 11
Dependent Claim
31 words
The invention of claim 1, wherein said guiding opening guidingly receives a reaming cutter device adapted to ream a patellar button prosthesis receiving surface on an articular surface of said patella.
Claim 12
Dependent Claim
41 words
The invention of claim 10, wherein said reaming cutter device has stop means for limiting extent of movement thereof through said guiding opening to limit degree of reaming of said articular surface and provide a uniform depth of reamed bone surface.
Claim 13
Dependent Claim
20 words
The invention of claim 10, wherein said reaming cutter device includes first peripheral cutting blades and second central cutting blades.
Claim 14
Dependent Claim
38 words
The invention of claim 12, wherein said central blades are recessed with respect to said peripheral blades, whereby said patellar button prosthesis receiving surface is stepped with a central bony surface elevated with respect to a peripheral surface.
Claim 15
Dependent Claim
18 words
The invention of claim 12, wherein bearing surfaces of said guiding opening are coated with a gall-resistant coating.
Claim 16
Independent Claim
132 words
A method of performing surgery including the steps of: a) performing an incision exposing a patella; b) engaging an anterior surface of said patella with a spiked plate; c) moving a reamer guide connected to said plate toward an articular surface of said patella and aligning said reamer guide on said articular surface using a central ridge of said patella as an anatomical landmark to locate and align a proper plane of bone resection; d) in the event said reamer guide engages said articular surface, using said reamer guide to guide a cutting device into engagement with said articular surface to ream said articular surface to form a stepped surface comprising a peripheral recessed surface and a central bony elevated surface; and e) installing a patellar button prosthesis on said reamed surface.
Claim 17
Independent Claim
132 words
A method of performing surgery including the steps of: a) performing an incision exposing a patella; b) engaging an anterior surface of said patella with a spiked plate; c) moving a reamer guide connected to said plate toward an articular surface of said patella and aligning said reamer guide on said articular surface using a central ridge of said patella as an anatomical landmark to locate and align a proper plane of bone resection; d) in the event said reamer guide engages said articular surface, using said reamer guide to guide a cutting device into engagement with said articular surface to ream said articular surface to form a stepped surface comprising a peripheral recessed surface and a central bony elevated surface; and e) installing a patellar button prosthesis on said reamed surface.
Claim 18
Dependent Claim
84 words
In a device for guiding reaming or drilling of an articular surface of a patella, the improvement comprising a patella engaging surface on said device adapted to engage said articular surface, said patella engaging surface having a curved portion merging into a straight portion and at least partially conforming to contours of said articular surface whereby firm engagement of said device on said articular surface may be accomplished and reaming or drilling may be carried out without relative movements between said device and patella.
Claim 19
Dependent Claim
84 words
In a device for guiding reaming or drilling of an articular surface of a patella, the improvement comprising a patella engaging surface on said device adapted to engage said articular surface, said patella engaging surface having a curved portion merging into a straight portion and at least partially conforming to contours of said articular surface whereby firm engagement of said device on said articular surface may be accomplished and reaming or drilling may be carried out without relative movements between said device and patella.
Claim 20
Dependent Claim
14 words
The invention of claim 16, wherein said patella engaging surface comprises two symmetric regions.
Claim 21
Dependent Claim
13 words
The invention of claim 17, wherein said regions are spaced from one another.
Claim 22
Dependent Claim
32 words
The invention of claim 16, wherein said curved portion merges into said straight portion at a tangent point having an elevation on said device corresponding to a height of a patellar ridge.
Claim 23
Dependent Claim
34 words
The invention of claim 19, wherein said point is spaced medially with respect to a center of a guide opening of said device, said guide opening being peripherally defined by said patella engaging surface.
Claim 24
Dependent Claim
124 words
A patellar clamp/guide device, comprising: a) a first handle having a proximal end and a distal end, and a second handle having a proximal end and a distal end, said handles being coupled together for movement with respect to one another; b) said first handle distal end including: i) a plate having a surface thereon adapted to securely engage an anterior surface of a patella; and ii) guide means for guiding a plunger in reciprocatory movements; c) said second handle distal end being coupled with said plunger whereby movements of said handles with respect to one another cause movements of said plunger with respect to said guide means; and d) a reamer guide removably attached to said plunger and including a guiding opening therethrough.
Claim 25
Dependent Claim
124 words
A patellar clamp/guide device, comprising: a) a first handle having a proximal end and a distal end, and a second handle having a proximal end and a distal end, said handles being coupled together for movement with respect to one another; b) said first handle distal end including: i) a plate having a surface thereon adapted to securely engage an anterior surface of a patella; and ii) guide means for guiding a plunger in reciprocatory movements; c) said second handle distal end being coupled with said plunger whereby movements of said handles with respect to one another cause movements of said plunger with respect to said guide means; and d) a reamer guide removably attached to said plunger and including a guiding opening therethrough.
Claim 26
Dependent Claim
24 words
The invention of claim 21, further including stop means for limiting spacing between said plate and said reamer guide to a desired minimum spacing.
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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) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |