Patella recession instrument and method for anatomically-shaped patellar prostheses
First Claim
1. An apparatus employing a plurality of rotary reamer tools for producing a recess in the posterior surface of a patella for receiving a patellar implant, the apparatus comprising:
- (a) a guide bushing having a guide opening therethrough;
(b) bushing positioning means for positioning and securing the guide bushing against the posterior surface of the patella in an operating position with the guide opening covering a total area of the patella to be recessed; and
(c) reamer guide means associated with the guide bushing, the reamer guide means for fixing a cutting face of each rotary reamer tool in at least one reaming position with the total area to be recessed when the guide bushing is in the operating position, the cutting face of the rotary reaming tool in each different position covering a different portion of the total area to be recessed, and such different portions combining to approximate an oblong area.
4 Assignments
0 Petitions
Accused Products
Abstract
A patella recession instrument (10) and method provides a guide for producing an oval, tri-oval, or elliptically shaped recess on the posterior surface of the osteotomized patella for receiving a similarly shaped backing portion of a patellar implant. The apparatus includes a guide bushing (12) and a bushing positioning mechanism (14) for securing the bushing against the posterior of the osteotomized patella, with a guide opening (54) formed through the bushing covering the total area to be recessed. A reamer guide structure, which may be a separate structure (16) received in the bushing guide opening (54) or integrally formed with the bushing (12), receives one or more rotary reamer tools (18) in a plurality of reaming positions. The cutting face (80) of the rotary reamer tool (18) in each different reaming position covers a different portion of the total area to be recessed. The recession method includes securing the guide bushing (12) in the proper operating position against the patella, sequentially positioning the cutting face (80) of the reamer tool (18) or tools in the plurality of different reaming positions, and operating the tool or tools to produce a series of intermediate recesses that combine to approximate the total area to be recessed.
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Citations
20 Claims
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1. An apparatus employing a plurality of rotary reamer tools for producing a recess in the posterior surface of a patella for receiving a patellar implant, the apparatus comprising:
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(a) a guide bushing having a guide opening therethrough; (b) bushing positioning means for positioning and securing the guide bushing against the posterior surface of the patella in an operating position with the guide opening covering a total area of the patella to be recessed; and (c) reamer guide means associated with the guide bushing, the reamer guide means for fixing a cutting face of each rotary reamer tool in at least one reaming position with the total area to be recessed when the guide bushing is in the operating position, the cutting face of the rotary reaming tool in each different position covering a different portion of the total area to be recessed, and such different portions combining to approximate an oblong area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for producing a recess in the posterior surface of a patella for receiving a patellar implant, the apparatus comprising:
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(a) a guide bushing having a guide opening therethrough; (b) bushing position means for positioning and securing the guide bushing against the posterior surface of the patella in an operating position in which the guide opening covers a total area to be recessed; (c) a rotary reamer tool having an elongated shank and a cutting head with a cutting face formed thereon; and (d) reamer guide means associated with the guide bushing, the reamer guide means for fixing the cutting face of the rotary reamer tool in a plurality of reaming positions within the total area to be recessed when the guide bushing is in the operating position, the cutting face of the rotary reamer tool in each different reaming position covering a different portion of the total area to be recessed and such different portions combining to approximate an oblong area. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for producing a patellar recess for receiving an anatomically shaped patellar implant, the method comprising the steps of:
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(a) securing a guide bushing in an operating position against the posterior surface of the patella to be recessed, the guide bushing having a guide opening therethrough and the guide opening covering a total area to be recessed when the guide bushing is secured in the operating position; (b) sequentially positioning at least one rotary reamer tool in a plurality of different reaming positions within the guide opening of the guide bushing; and (c) during the time that each rotary reamer tool is positioned in the respective reaming position, driving the rotary reamer tool to produce a separate intermediate recess in the patella, the separate intermediate recesses combining to form a continuous oblong recess approximating the total area to be recessed. - View Dependent Claims (17, 18, 19, 20)
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Specification