Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2000-10-25
2001-09-04
Philogene, Pedro (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C606S08600R, C606S080000
Reexamination Certificate
active
06283972
ABSTRACT:
This invention relates to a medical holding device. It relates more particularly to a holder for an acetabular reamer.
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
An acetabular reamer is a bone-cutting tool which is rotated by a motorized driver. As shown in
FIG. 1
, a reamer R is basically a hemispherical metal shell S usually of stainless steel whose surface is formed with a multiplicity of holes H defining outwardly protruding cutting edges E. A pair of rigid cylindrical rods forming cross arms A are connected adjacent to the edge margin of the shell S. These cross arms are used to releasably connect the reamer R to the rotary shaft of a driving tool (not shown).
When not in use, acetabular reamers normally repose in a tray which protects them to some extent during sterilization and handling. However, they are still free to move about within the tray which could result in damage to the cutting edges of the reamers. Also, since they are free to move within the tray, they may have various orientations making it more difficult to grasp and attach successive reamers to the driving tool.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a holder for an acetabular reamer which fixes the orientation of the reamer.
Another object of the invention is to provide such a holder which releasably secures the reamer to the bottom wall of a tray or other support surface.
A further object of the invention is to provide a holder of this type which presents a selected side of the reamer to a surgeon or other user.
Yet, another object of the invention is to provide a holder for an acetabular reamer which is relatively easy and inexpensive to manufacture in quantity.
Other objects will, in part, be obvious and will, in part, appear hereinafter. The invention accordingly comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the following detailed description, and the scope of the invention will be indicated in the claims.
Briefly, my holder is adapted to support an acetabular reamer of the type which has a generally hemispherical shell with a single circular edge and rigid cross arms connected adjacent to that edge. The holder includes a base having a central datums and at least three pedestals extending up from the base at locations space radially from and distributed about the datums. Each pedestal has side walls and an upper wall facing away from the base, the upper wall being curved so that, together, the upper walls of the pedestals define an imaginary surface having spherical curvature. The pedestals are adapted to guide or support a reamer whose shell is congruent to the collective upper walls of the pedestals and whose edge is substantially parallel to the base.
In one preferred embodiment of the holder, the upper walls of the pedestals are concave and arranged to support a reamer, shell-side-down, so that the cross arms of the reamer face away from the base.
In a second preferred holder embodiment, the upper walls of the pedestals are convex and the pedestals are cylindrically curved about the datums. In addition, each upper wall has a radially outer bevel and a crown so that each pedestal is lower at the side walls thereof than at the crown. Also, a pair of clips extend up from the base at locations spaced radially from and distributed about the datums. These clips have open mouths and are arranged and adapted to receive and releasably retain a confronting pair of cross arms of a reamer. Preferably, the pedestals are angularly offset from the clips and the clips are no higher than the side walls of the pedestals. Resultantly, when a reamer is juxtaposed to the holder so that the reamer cross arms engage the upper walls of the pedestals, the cross arms slide along those edges and rotate the reamer until the cross arms are aligned with the mouths of the clips, whereupon the reamer can be pressed down until the cross arms are resiliently received in the clips.
Preferably, the base of each holder includes means for releasably fastening the base to a support surface such as the bottom wall of a sterilization tray. In its simplest form, the fastener means may be a through hole in the base at the datums and a fastener arranged and adapted to extend through that hole and into the support surface.
As it will become apparent, the holder may be a unitary molded plastic part which can be manufactured in quantity at relatively low cost.
REFERENCES:
patent: 4611587 (1986-09-01), Powlan
patent: 5501686 (1996-03-01), Sayler
patent: 5658290 (1997-08-01), Lechot
patent: 5817096 (1998-10-01), Sayler
patent: 5976148 (1999-11-01), Charpenet et al.
patent: 5980170 (1999-11-01), Sayler
Philogene Pedro
Riley Medical Inc.
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