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System and method for prosthetic fitting and balancing in joints

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System and method for prosthetic fitting and balancing in joints


A device for intraoperative use in balancing joint forces and verifying the placement of the tibial component in total knee arthroplasty includes a spacer defining an enclosure; the spacer is sized to engage a top portion of the tibial component. A sensor array is embedded in the spacer, the sensor array measures forces on the spacer. A wireless transceiver is embedded in the spacer and forwards the output to a processor. The processor is analyzes the output and creates a pressure distribution graph indicative of the forces on the spacer, thereby assisting a surgeon in performing selective soft tissue release or component positioning in connection with surgical implantation of an orthopedic knee prosthesis.
Related Terms: Intraoperative

Browse recent The Board Of Trustees Of The University Of Illinois patents - Urbana, IL, US
Inventors: Farid Amirouche, Mark H. Gonzalez
USPTO Applicaton #: #20120290088 - Class: 623 1412 (USPTO) - 11/15/12 - Class 623 
Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor > Implantable Prosthesis >Meniscus

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The Patent Description & Claims data below is from USPTO Patent Application 20120290088, System and method for prosthetic fitting and balancing in joints.

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CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No. 12/539,283, filed Aug. 11, 2009 (now U.S. Pat. No. 8,197,549), which is a divisional of U.S. patent application Ser. No. 10/393,243, filed Mar. 19, 2003 (now U.S. Pat. No. 7,575,602), which is a non-provisional application claiming priority from Provisional Application Ser. Number 60/365,678, filed Mar. 19, 2002. The disclosures of U.S. patent application Ser. Nos. 12/539,283; 10/393,243, and 60/365,678 are hereby incorporated by reference herein.

FIELD OF THE INVENTION

The present invention relates to joint replacement and, more particularly, to a system and method for prosthesis fitting and balancing in joints.

BACKGROUND OF THE INVENTION

Some medical conditions can result in the degeneration of a human joint, causing a patient to consider and ultimately undergo joint replacement surgery. While joint replacement surgery is well known in the art, the decision to undergo such a procedure may be a difficult one, as the long-term success of the surgery oftentimes relies upon the skill of the surgeon and may involve a long, difficult recovery process.

The materials used in a joint replacement surgery are designed to enable the joint to move just like a normal joint. The prosthesis is generally composed of a metal piece that fits closely into and bears on a corresponding plastic component. The plastic component is typically supported on another metal piece. Several metals are typically used, including stainless steel, alloys of cobalt and chrome, and titanium, while the plastic material is typically constructed of a durable and wear resistant polyethylene. Plastic bone cement may be used to anchor the prosthesis into the bone, however, the prosthesis may be implanted without cement when the prosthesis and the bone are designed to fit and lock together directly.

To undergo the operation, the patient is given an anesthetic while the surgeon replaces the damaged parts of the joint. For example, in knee replacement surgery, the damaged ends of the bones (i.e., the femur and the tibia) and the cartilage are replaced with metal and plastic surfaces that are shaped to restore knee movement and function. In another example, to replace a hip joint, the damaged ball (the upper end of the femur) is replaced by a metal ball attached to a metal stem fitted into the femur, and a plastic socket is implanted into the pelvis, replacing the damaged socket. Although hip and knee replacements are the most common, joint replacement can be performed on other joints, including the ankle, foot, shoulder, elbow and fingers.

As with all major surgical procedures, complications can occur. Some of the most common complications are typically thrombophlebitis, infection, stiffness, and loosening. While thrombophlebitis (i.e., vein inflammation related to a blood clot) and infection are oftentimes treated medically, stiffness and loosening may require additional surgeries. One technique utilized to reduce the likelihood of stiffness and loosening relies upon the skill of the surgeon to align and balance the replacement joint along with ligaments and soft tissue during surgery.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a computer system illustrating an example environment of use for the disclosed system;

FIG. 2 is a block diagram of a joint prosthesis fitting and balancing system;

FIG. 3 is a front perspective view of an embodiment of a prosthesis fitted within a human knee;

FIG. 4 is a top perspective view of an embodiment of a spacer of the system of FIG. 2;

FIG. 5 is a bottom perspective view of the spacer of FIG. 4;

FIG. 6 is a side perspective view of an embodiment of a portion of the system of FIG. 2;

FIG. 7 is a front perspective view of an embodiment of a portion of the system of FIG. 2;

FIG. 8 is a side view of an embodiment of a prosthesis fitted within a human knee, wherein the knee is bent at zero degrees;

FIG. 8A is a graph plotting pressure readings in the prosthesis of FIG. 8;

FIG. 9 is a side view of an embodiment of a prosthesis fitted within a human knee, wherein the knee is bent at thirty degrees;

FIG. 9A is a graph plotting pressure readings in the prosthesis of FIG. 9;

FIG. 10 is a side view of an embodiment of a prosthesis fitted within a human knee, wherein the knee is bent at sixty degrees;

FIG. 10A is a graph plotting pressure readings in the prosthesis of FIG. 10;



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Previous Patent Application:
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Next Patent Application:
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Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20120290088 A1
Publish Date
11/15/2012
Document #
13489333
File Date
06/05/2012
USPTO Class
623 1412
Other USPTO Classes
International Class
61F2/08
Drawings
17


Intraoperative


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