Flexible surface parameter measurement system for the muscular-skeletal system

• US 9,332,943 B2
• Filed: 09/23/2011
• Issued: 05/10/2016
• Est. Priority Date: 09/23/2011
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: OrthoSensor, Inc (Stryker Corporation)
• Inventors: Stein, Marc, Miller, Andrew P., Addink, Jason, Chase, Andrew U.
• Primary Examiner(s): Henson, Devin
• Assistant Examiner(s): McCrosky, David J
• Application Number:
  US13/244,211
• Publication Number:
  US 20130079672A1
• Time in Patent Office: 1,691 Days
• Field of Search: 600/587, 600/595, 623/20.3, 623/20.21, 623 2031- 2036, 623/20.14, 623/20.15
• US Class Current: 1/1
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/1036 Measuring load distribution, e.g. podologic studies
• CPC Class Codes: A61B 5/6878 Bone
• CPC Class Codes: A61B 5/6882 Anchoring means
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30589 Sealing means
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30668 Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2002/3067 for data transfer
• CPC Class Codes: A61F 2002/30672 temporary
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/3895 unicompartimental
• CPC Class Codes: A61F 2002/4666 for measuring force, pressure or mechanical tension

Abstract

At least one embodiment is directed to an insert for measuring a parameter of the muscular-skeletal system. The insert can be temporary or permanent. In one embodiment, the insert is prosthetic component for a single compartment of the knee. The insert comprises a support structure and a support structure respectively having an articular surface and a load bearing surface. The height of the insert can be less than 10 millimeters. At least one internal cavity is formed when support structures are coupled together for housing electronic circuitry, sensors, and the power source. The insert includes a flexible articular surface. Flexible articular surface transfers loading to sensors internal to the insert.

Claims

1. A measurement system for measuring loading applied by a muscular-skeletal system comprising:

an insert configured to measure loading value and loading location, where the insert includes;

a first support structure having an articular surface and a major interior surface, wherein the major interior surface is planar, wherein the first support structure has a first region with a first thickness and a second region with a second thickness, and wherein the first and second thicknesses are different;

a load plate wherein the load plate has a major planar surface, wherein the major planar surface of the load plate couples to the major interior surface of the first support structure;

at least three sensors, where the articular surface is configured to transfer loading to the load plate, wherein the load plate is configured to transfer loading to the at least three sensors, wherein data from the at least three sensors is configured to be used by a processor to determine loading location and loading value on the articular surface, wherein the first support structure includes a circumferential groove formed in a periphery of the first support structure, the circumferential groove allowing the articular surface to flex under loading.

2. A measurement system for measuring loading applied by a muscular-skeletal system comprising:

an insert configured to measure loading value and loading location, where the insert includes;

a first support structure having an articular surface and a major surface wherein the first support structure includes a circumferential groove formed in a periphery of the first support structure, the circumferential groove allowing the articular surface to flex under loading;

at least three sensors underlying the articular surface of the first support structure, wherein measurement data from the at least three sensors is configured to be used by a processor to determine loading location and loading value on the articular surface;

a load plate coupled between the major surface of the first support structure and the at least three sensors; and

a second support structure coupled to the first support structure where the first and second support structures are configured to form a housing that isolates the at least three sensors from an external environment.

3. The measurement system of claim 2 further including:

electronic circuitry coupled to the at least three sensors configured to receive measurement data from the at least three sensors and transmit the measurement data from the insert; and

a power source configured to provide power to the electronic circuitry and the at least three sensors where the electronic circuitry and power source are in the housing, where the first support structure has a first region with a first thickness and a second region with a second thickness, and where the first and second thicknesses are different.

4. A measurement system for measuring loading applied by a muscular-skeletal system comprising:

a housing configured to measure a loading value and loading location, where an insert includes;

a first support structure having a surface configured to couple to the muscular-skeletal system and an internal major surface wherein the first support structure includes a circumferential groove formed in a periphery of the first support structure, the circumferential groove allowing the surface to flex under loading;

at least three sensors underlying the internal major surface of the first support structure;

electronic circuitry coupled to the at least three sensors where the electronic circuitry is configured to receive measurement data from the at least three sensors and transmit measurement data from the at least three sensors;

a power source configured to power the at least three sensors and the electronic circuitry;

a second support structure coupled to the first support structure where the first and second structures couple together to form a housing that encloses and isolates the at least three sensors, power source, and electronic circuitry from an external environment; and

a processor configured to receive measurement data where the processor is configured to use the measurement data from the at least three sensors to determine loading location and loading value on the surface of the first support structure.

5. The measurement system of claim 4 where the first support structure comprises polycarbonate.

6. The measurement system of claim 4 wherein the internal major surface is planar.

7. The measurement system of claim 4 where the housing is a prosthetic component.

8. The measurement system of claim 7 where the prosthetic component is an insert.

9. The measurement system of claim 4 where the first support structure has a first region with a first thickness and a second region with a second thickness, where the first and second thicknesses are different.

10. The measurement system of claim 4 where the surface of the first support structure is an articular surface to support movement of the muscular-skeletal system.

11. The measurement system of claim 4 further including a load plate having a major surface between the at least three sensors and the surface of the first support structure, which is an articular surface, wherein the internal major surface of the first structure couples to the major surface of the load plate.

12. The measurement system of claim 11 wherein the electronic circuitry and the at least three sensors underlie the load plate.