Modular acetabular reconstruction plate

Details Modular acetabular reconstruction plate Modular acetabular reconstruction plate

1999-11-03

2001-10-23

Isabella, David J. (Department: 3738)

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

C623S022380

Reexamination Certificate

active

06306173

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to orthopedics and, in particular, to a versatile reconstruction system associated with acetabular prosthetics.
BACKGROUND OF THE INVENTION
Especially in the case of revision surgical procedures wherein the pelvis has been severely compromised or deteriorated, it is known to use support structures to receive an acetabular prosthetic device.
One such structure is disclosed in U.S. Pat. No, 5,314,490 to Wagner et al, entitled OUTER CUP FOR AN ARTIFICIAL HIP JOINT SOCKET. According to this patent, an artificial hip joint socket for fastening to a pelvic bone includes a metallic outer cup forming a concavity for receiving a hip, which terminates in an equatorial edge to which supporting flaps are fastened. The flaps include holes to receive bone screws and have preset lines of grooves to enabling preferential bending to provide conformance with the pelvic region surrounding the procedure. The problem with this particular configuration, and others like it, is that, even with the grooves affording preferential bending, the flaps are not sufficiently malleable or adjustable in multiple dimensions to permit conformance to surrounding bone in all situations.
SUMMARY OF THE INVENTION
The present invention addresses a deficiency in the prior art by providing a more flexible, modular acetabular reconstruction plate and system of installation incorporating other advantages.
Apparatus according to the invention includes a generally cup-shaped portion having a peripheral rim and back surface adapted for fixation within a human pelvis, and one or more malleable extension arms connected to the rim of the cup-shaped portion. In the preferred embodiment, each malleable extension arm includes one or more apertured sections spaced apart from one another by a necked-down section, thus enabling each arm to be manipulated in three dimensions, as desired, so as to assume a shape in intimate conformity with surrounding bone.
To enhance installational stability, modular acetabular reconstruction apparatus according to the invention preferably includes at least one malleable extension arm adapted for overlying contact with the ilium of a human pelvis. One malleable extension arm adapted for overlying contact with the ischium of a human pelvis would also be advantageous. Laterally or medially oriented arms may further be provided, and in the event of pairs of arms which are sufficiently closely spaced, apart, malleable apertured bridge elements may further be provided between adjacent arms.
The back surface of the generally cup-shaped portion may be adapted for a cemented or a non-cemented interface within a human pelvis; as such, the back surface may be adapted for porous bone in-growth.
The invention further includes a method of treating a human acetabulum, wherein each malleable extension arm is manipulated in multiple dimensions, as required, so that each arm is in intimate physical conformity with the surrounding bone prior to fastening and fixation. Various bending tools and techniques are also disclosed in the accompanying detailed description and drawings which follow.


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