Measurement device for the muscular-skeletal system having load distribution plates

• US 9,844,335 B2
• Filed: 09/28/2012
• Issued: 12/19/2017
• Est. Priority Date: 02/27/2012
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: OrthoSensor, Inc (Stryker Corporation)
• Inventors: Stein, Marc, Carrasco, Gabriel
• Primary Examiner(s): ABOUELELA, MAY A
• Application Number:
  US13/631,498
• Publication Number:
  US 20130226034A1
• Time in Patent Office: 1,908 Days
• Field of Search: 600587, 600595, 707758, 623 2032, 623 2014, 623 203
• CPC Class Codes: A61B 2562/0252 Load cells
• CPC Class Codes: A61B 5/076 Permanent implantations telemetry using implanted circuitry A61B5/0031; implanted stimulators for therapy A61N1/3605, A61N1/362, A61N1/372
• CPC Class Codes: A61B 5/1036 Measuring load distribution, e.g. podologic studies
• CPC Class Codes: A61B 5/4509 Bone density determination
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4585 Evaluating the knee
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 5/6878 Bone
• CPC Class Codes: A61B 5/7225 Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation A61B5/30, A61B5/316 take precedence; transformers for specific applications H01F38/00; amplifiers H03F

Abstract

A measurement device suitable to measure a force, pressure, or load applied by the muscular-skeletal system is disclosed. The measurement module includes a unitary circuit board that couples electronic circuitry to sensors. In one embodiment, the sensors are integrated in the unitary circuit board. Using more than one sensor allows the position of applied load by the muscular-skeletal system to be measured. In one embodiment, the sensors of a sensor array can be elastically compressible capacitors. A load plate can underlie the sensor array. Similarly, a load plate can overlie the load plate. Load plates are rigid structures for distributing a force, pressure, or load. The measurement device can include an articular surface for allowing movement of the muscular-skeletal system. A remote system can be in proximity to the measurement device. The remote system can receive, process, and display data from the measurement module in real-time.

Claims

1. A measurement device for measuring a force pressure, or load applied by the muscular-skeletal system comprising:

a first support structure having a bottom surface and a sidewall;

a first load plate having a surface wherein a whole surface of the first load plate contacts the bottom surface of the first support structure;

a sensor array overlying the first load plate wherein a load bearing surface of each sensor of the sensor array are approximately co-planar;

a second load plate overlying the sensor array wherein the second plate is configured to move to compress the sensor array; and

a second support structure coupled to the first support structure configured to form a housing to isolate an electronic circuitry and the sensor array from an external environment wherein the first and second support structures comprise a polymer material.

2. The measurement device of claim 1 wherein the electronic circuitry is coupled to the sensor array and configured to transmit data from the sensor array to a remote system.

3. The measurement device of claim 2 further including a load pad coupled to each sensor of the sensor array where the load pads couple to the second load plate.

4. The measurement device of claim 3 where a surface of each load pad are approximately co-planar.

5. The measurement device of claim 1 wherein the second support structure includes an interior surface configured to couple to the second load plate.

6. The measurement device of claim 1 further including at least one alignment feature configured to align the first load plate to the first support structure wherein the at least one alignment feature extends from the bottom surface of the first support structure.

7. The measurement device of claim 1 further including a reference sensor identical to sensors of the sensor array.

8. The measurement device of claim 1 wherein sensors of the sensor array are formed in an interconnect coupling the sensor array to the electronic circuitry.

9. The measurement device of claim 8 wherein the measurement device has a unitary circuit board configured to couple the electronic circuitry and sensors.

10. A measurement device for measuring a force pressure, or load applied by the muscular-skeletal system comprising:

a first support structure having an interior bottom surface and a sidewall;

a first load plate wherein a whole surface of the first load plate contacts the interior bottom surface of the first support structure;

electronic circuitry wherein at least one component of the electronic circuitry is coupled to a printed circuit board;

a sensor array overlying the first load plate wherein the sensor array couples to the electronic circuitry and wherein a load bearing surface of each sensor of the sensor array are approximately co-planar;

a second support structure coupled to the first support structure configured to form a housing to isolate the electronic circuitry and the sensor array from an external environment wherein the second support structure includes a surface configured to couple to the second load plate.

11. The measurement device of claim 10 wherein sensors of the sensor array are formed in an interconnect and wherein a portion of the interconnect couples the sensor array to the electronic circuitry.

12. The measurement device of claim 10 further including a reference sensor identical to the sensors of the sensor array and a load pad overlying each sensor of the sensor array.

13. The measurement device of claim 11 wherein the measurement device has a unitary circuit board configured to couple the electronic circuitry and sensors.

14. The measurement device of claim 10 further including a second load plate overlying the sensor array wherein the second plate is configured to move to compress the sensor array when the measurement device is loaded.

15. A measurement device for measuring a force pressure, or load applied by the muscular-skeletal system comprising:

a first support structure having an interior bottom surface and a sidewall forming a cavity;

a first load plate having a surface wherein a whole surface of the first load plate contacts the interior bottom surface of the first support structure within the cavity;

electronic circuitry wherein at least one component of the electronic circuitry is coupled to a printed circuit board;

a sensor array formed in an interconnect overlying the first load plate wherein a portion of the interconnect couples to the electronic circuitry and wherein a load bearing surface of each sensor of the sensor array are approximately co-planar;

a second load plate overlying the sensor array wherein the second plate is configured to move to compress the sensor array when a load is applied to the measurement device; and

a second support structure coupled to the first structure configured to form a housing to isolate the electronic circuitry and the sensor array from an external environment wherein the first and second support structures comprise a polymer material, and wherein the second support structure includes a surface configured to couple to the second load plate.

16. The measurement device of claim 15 further including a reference sensor wherein the reference sensor is coupled to the electronic circuit, wherein a portion of the interconnect couples the sensor array to the electronic circuitry, and wherein the sensor array is formed in the interconnect.

17. The measurement device of claim 16 wherein the sensor array comprises capacitive sensors.

18. The measurement device of claim 15 wherein the measurement device has a unitary circuit board configured to couple the electronic circuitry and sensors.

19. The measurement device of claim 15 further including a load pad overlying each sensor of the sensor array and wherein the load pad couples to the second load plate.