# US 5,704,940 A · Instrument set for preparation of the seat for the femoral component of a non-cemented hip prosthesis

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- Number: US 5,704,940 A
- Document ID: US5704940A
- Status: Granted
- Kind: A
- Application number: 08/723,153
- Filed: 1996-09-30
- Granted: 1998-01-06
- Earliest claimed: 1995-10-03
- Inventors: Piero Garosi
- Web page: https://patentgrep.com/patent/US5704940A

## CPC

- A61B 17/1668: {for the upper femur (A61B17/164 takes precedence)}
- A61B 17/1659: {Surgical rasps, files, planes, or scrapers}
- A61B 2017/0046: {with a releasable handle; with handle and operating part separable}
- A61F 2/30724: {Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity}
- A61F 2/367: {Proximal or metaphyseal parts of shafts (trochanteric devices connected to said proximal parts A61F2/30739)}
- A61F 2/3676: {Distal or diaphyseal parts of shafts}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

The rasps of a first set of metaphyseal rasps are capable of working, in a first stage, the femoral canal in the zone of the metaphysis until the bony part K1, K2 is reached and cut into to form the metaphyseal seat for a femoral component of a hip prosthesis, the rasps having guide stems which act in the zone of the diaphysis. The rasps of a second series of sub-metaphyseal and diaphyseal rasps are capable of working, in a second stage, the femoral canal in the sub-metaphyseal zone and the adjacent zone of the diaphysis, until the bony part K3 is reached and cut into to complete the seat for the femoral component.

## Claims

### Claim 1

A set of instruments for preparing the femur canal of a femur for receiving a non-cemented hip prosthesis, comprising:
an elongated reamer tool having a uniform diameter, said reamer tool being configured for reaming the diaphyseal zone of the femoral canal for preparing the diaphysis to receive a distal portion of said hip prosthesis;
a series of metaphyseal rasps, each of said metaphyseal rasps being a different size and comprising a proximal cutting portion and a distal guiding means, said proximal cutting portion having bone cutting teeth for cutting only the metaphyseal zone of the femoral canal for preparing the metaphysis to receive a proximal portion of said hip prosthesis, and said distal guiding means having a smooth, non-cutting portion for guiding said metaphyseal rasp in said femoral canal; and
a series of sub-metaphyseal rasps, each of said sub-metaphyseal rasps being a different size and comprising a proximal portion, a medial cutting potion, and a distal guiding means, said proximal portion having a smooth, non-cutting surface, said medial cutting portion having bone cutting teeth for cutting only the sub-metaphyseal zone of the femoral canal for preparing the sub-metaphysis to receive a medial portion of a hip prosthesis, and said distal guiding means having a smooth, non-cutting portion for guiding said sub-metaphyseal rasp in said femoral canal.

### Claim 2 (depends on 1)

The set of instruments as set forth in claim 1, wherein the distal guiding means of the series of metaphyseal rasps comprises a stem-shaped elongated portion for extension along the diaphysis, and further comprises an interchangable tip portion having a diameter sized to correspond to the diameter of the reamer tool, whereby the tip portion closely fits a reamed femoral canal and serves to guide the metaphyseal rasps during a rasping procedure.

### Claim 3 (depends on 1)

The set of instruments as set forth in claim 1, wherein the distal guiding means of the series of sub-metaphyseal rasps comprises an interchangable tip portion having a diameter sized to correspond to the diameter of the reamer tool, whereby the tip portion closely fits a reamed femoral canal and serves to guide the sub-metaphyseal rasps during a rasping procedure.