Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1999-04-29
2001-03-27
Isabella, David J. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
Reexamination Certificate
active
06206928
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH
Not Applicable.
FIELD OF THE INVENTION
The present invention relates to an orthopaedic tray trial having at least one attached fastening element.
BACKGROUND OF THE INVENTION
During knee replacement surgery tibial trials are used to assist a surgeon in preparing the tibial surface for implantation of the tibial portion of the artificial knee. A surgeon uses a tibial tray trial to determine the tibial implant size, to make the appropriate cuts and reams in the bone, and to ensure a proper alignment and tibial component thickness prior to implanting the tibial components.
Such a procedure typically entails making an initial tibial plateau cut on the proximal tibial portion of the knee; determining a preferred size tray trial (and ultimately tray implants); placing the selected tray trial over the tibial surface; performing a trial reduction to ensure proper tibial component thickness and alignment; attaching a punch guide to the tibial tray trial; and cutting or reaming the tibial bone through openings in the punch guide and tray trial to prepare it to receive a stem or keel of the tibial implant. During this procedure it is necessary to fix the tray trial to the tibia, at least before cutting or reaming the tibial bone through openings in the punch guide and tray trial.
Known tibial tray trials, as illustrated in
FIG. 1
, typically include a tibial alignment handle
10
is attached to the tibial tray trial
12
to properly locate the trial with respect to a prepared tibia
14
. Pins
16
are then driven through holes in the tray trial to fix the tray trial to the tibia
14
. At least three hands are require to fix tibial tray trial
12
to tibia
14
: one hand holds the tray trial
12
in place using handle
10
; a second holds a pin
16
in place; and a third hand drives pin
14
through tray trial
12
into tibia
14
to fix the tray trial
12
thereto.
One difficulty with the known method for fixing a tibial tray trial to a tibia is that, because it requires more than two hands, a surgeon cannot fix the tray trial without help. Another problem involves the pins themselves. Because the pins must be removed in order to remove the trial to place the permanent prosthesis, they typically include portions that extend above the tray trial to facilitate their removal. However, trialing sometimes involves, particularly when implanting a rotating platform knee tibial prosthesis, moving or rotating a trial insert with respect to the tibial tray trial. When the pins extend above the surface of the tibial tray trial, the pins can prevent relative movement between the tray trial and the trial insert. In addition, pins that are separate from the tray may become lost during surgery, cleaning, or transportation.
SUMMARY OF THE INVENTION
The present invention provides an orthopaedic tray trial for attachment to a resected bone surface having a base plate and at least one movable fastening element attached to the base plate. The base plate has a bone contacting surface and an opposed working surface. The fastening element includes a striking element and a bone penetrating pin attached to the striking element and extending in a direction from the working surface toward the bone contacting surface of the base plate.
The fastening elements may be selectively movable between an open position and a closed position. In the open position, the bone penetrating pin does not extend beyond the bone contacting surface of the base plate, and in the closed position, the striking element does not extend beyond the working surface.
In one embodiment, the fastening element is rotatably attached to the base plate using a hinge pin to connect the striking element to the base plate. The orthopaedic tray trial of the invention may be configured for use as a tibial tray trail for attachment to a resected tibia.
REFERENCES:
patent: 4919671 (1990-04-01), Karpf
patent: 5766256 (1998-06-01), Oudard et al.
patent: 5976147 (1999-11-01), Lasalle
Depuy Orthpaedics, Inc.
Isabella David J.
Nutter & McClennen & Fish LLP
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