Threaded drill/IM rod

Details Threaded drill/IM rod Threaded drill/IM rod

1999-09-08

2001-03-06

Philogene, Pedro (Department: 3732)

Surgery

Instruments

Orthopedic instrumentation

C606S075000, C606S075000

Reexamination Certificate

active

06197031

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to intramedullary rods for use in conjunction with instruments for orthopaedic surgery.
A common technique for resecting the ends of bones during orthopaedic surgery involves the use of an intramedullary (IM) rod to provide a reference to the axis of the bone and to provide a support base for measurement and resection instruments. An example of such a prior art technique and instruments is found in the
Miller/Galante Total Knee System Surgical Technique
published and sold by Zimmer, Inc. In this system, a starter instrument is used to form a small indentation or hole in the end of the bone. A drill is then used to enlarge the starter hole and drill into the IM canal. Alignment guides and other instruments having an IM rod are then inserted into the canal. An improvement in IM instrument technique is taught in U.S. Pat. No. 5,613,970 assigned to Zimmer, Inc., and in the
NexGen®Complete Knee Solution Tibial Stem Extension &
Augmentation Surgical Tec{grave over (h)}nique
published by Zimmer, Inc. The improvement is the use of an IM reamer that is left in place after the IM canal is reamed and on which various instruments can be mounted. This improvement saves the steps of removing the drill or reamer and inserting a separate IM rod.
SUMMARY OF THE INVENTION
The present invention improves on the prior art IM instruments and techniques by providing an IM rod having a proximal threaded portion that threads into the bone to increase the stability of the rod. The rod further includes an extended, pointed tip for positive slip-free placement of the rod on the bone and an end cutting drill and reaming flutes for drilling a hole into and reaming the IM canal. Conformity between the shaft and the IM canal is increased to maximize stability by including a starter tip and drill as integral extensions of the shaft. Flutes extend up the rod beyond the drilling and reaming portion to allow decompression of the IM canal as the rod is inserted into the canal.


REFERENCES:
patent: 4463753 (1984-08-01), Gustilo
patent: 4710075 (1987-12-01), Davison
patent: 4830000 (1989-05-01), Shutt
patent: 4978350 (1990-12-01), Wagenknecht
patent: 5573537 (1996-11-01), Rogozinski
patent: 5613970 (1997-03-01), Houston et al.
patent: 5908423 (1999-06-01), Kashuba et al.
patent: 5941706 (1999-08-01), Ura
NexGen Complete Knee Solution Tibial Stem Extension & Augmentation Surgical Technique; 97-5988-102; 1996 Zimmer, Inc.
Miller/Galante Total Knee System Technique; 97-5780-02; Rev 2 1985, 1988 Zimmer, Inc.

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