Orthopaedic sensor module and system for determining joint forces of a patient's knee joint
First Claim
1. An orthopaedic surgical device for measuring a joint force of a patient'"'"'s joint, the orthopaedic surgical device comprising:
- a tibial paddle shaped to be positioned between a proximal end of a patient'"'"'s tibia and a distal end of a patient'"'"'s femur, the tibial paddle having (i) a substantially planar upper surface, (ii) a substantially planar bottom surface, (iii) a top paddle housing having a first outer sidewall that defines an outer edge of the top paddle housing, a first opening defined in the substantially planar upper surface, and a first inner sidewall that defines a first centrally-located aperture that is spaced apart from the first outer sidewall and extends inwardly from the first opening, the first centrally-located aperture being enclosed completely by the first inner sidewall, (iv) a bottom paddle housing having a second outer sidewall that defines an outer edge of the bottom paddle housing, a second opening defined in the substantially planar bottom surface, and a second inner sidewall that defines a second centrally-located aperture that is spaced apart from the second outer sidewall and extends inwardly from the second opening, the second centrally-located aperture being enclosed completely by the second inner sidewall, and (v) a posterior notch extending inwardly from the first outer sidewall and the second outer sidewall, wherein the first and second apertures are in fluid communication with each other to define, in part, a vertical passageway through the tibial paddle that is spaced apart from the posterior notch,a sensor array positioned in the tibial paddle and configured to generate sensor signals indicative of a joint force between the patient'"'"'s tibia and femur, the sensor array comprising a plurality of medial-anterior sensors to measure a medial-anterior force component of the joint force, a plurality of medial-posterior sensors to measure a medial-posterior force component of the joint force, a plurality of lateral-anterior sensors to measure a lateral-anterior force component of the joint force, and a plurality of lateral-posterior sensors to measure a lateral-posterior force component of the joint force, each of the medial-anterior sensors and lateral-anterior sensors having a substantially equal surface area and each of the medial-posterior sensors and lateral-posterior sensors having a substantially equal surface area,an elongated handle secured to the tibial paddle and defining a longitudinal axis that is offset from an anterior-to-posterior bisecting axis of the tibial paddle,a first display secured to an end of the handle distal from the tibial paddle, anda circuit positioned in the handle, the circuit configured to receive the sensor signals from the sensor array and to control the first display to provide a visual indication of the medial-lateral balance of the joint force.
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0 Petitions
Accused Products
Abstract
An orthopedic surgical device includes a tibial paddle shaped to be positioned in the patient'"'"'s knee joint and a handle extending from the tibial paddle. The tibial paddle includes a sensor array positioned therein and configured to generate sensor signals indicative of the joint force of the patient'"'"'s knee joint. The orthopedic surgical device also includes a control circuit configured to control a display located on the handle to provide a visual indication of the medial and lateral balance of the joint force. In some embodiments, various tibial trialing components may be coupled to the tibial paddle along with an associated adaptor.
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Citations
24 Claims
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1. An orthopaedic surgical device for measuring a joint force of a patient'"'"'s joint, the orthopaedic surgical device comprising:
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a tibial paddle shaped to be positioned between a proximal end of a patient'"'"'s tibia and a distal end of a patient'"'"'s femur, the tibial paddle having (i) a substantially planar upper surface, (ii) a substantially planar bottom surface, (iii) a top paddle housing having a first outer sidewall that defines an outer edge of the top paddle housing, a first opening defined in the substantially planar upper surface, and a first inner sidewall that defines a first centrally-located aperture that is spaced apart from the first outer sidewall and extends inwardly from the first opening, the first centrally-located aperture being enclosed completely by the first inner sidewall, (iv) a bottom paddle housing having a second outer sidewall that defines an outer edge of the bottom paddle housing, a second opening defined in the substantially planar bottom surface, and a second inner sidewall that defines a second centrally-located aperture that is spaced apart from the second outer sidewall and extends inwardly from the second opening, the second centrally-located aperture being enclosed completely by the second inner sidewall, and (v) a posterior notch extending inwardly from the first outer sidewall and the second outer sidewall, wherein the first and second apertures are in fluid communication with each other to define, in part, a vertical passageway through the tibial paddle that is spaced apart from the posterior notch, a sensor array positioned in the tibial paddle and configured to generate sensor signals indicative of a joint force between the patient'"'"'s tibia and femur, the sensor array comprising a plurality of medial-anterior sensors to measure a medial-anterior force component of the joint force, a plurality of medial-posterior sensors to measure a medial-posterior force component of the joint force, a plurality of lateral-anterior sensors to measure a lateral-anterior force component of the joint force, and a plurality of lateral-posterior sensors to measure a lateral-posterior force component of the joint force, each of the medial-anterior sensors and lateral-anterior sensors having a substantially equal surface area and each of the medial-posterior sensors and lateral-posterior sensors having a substantially equal surface area, an elongated handle secured to the tibial paddle and defining a longitudinal axis that is offset from an anterior-to-posterior bisecting axis of the tibial paddle, a first display secured to an end of the handle distal from the tibial paddle, and a circuit positioned in the handle, the circuit configured to receive the sensor signals from the sensor array and to control the first display to provide a visual indication of the medial-lateral balance of the joint force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20, 21)
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13. A sensor module to measure a joint force of a patient'"'"'s joint, the sensor module comprising:
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a housing having a handle and a tibial paddle, the tibial paddle including an upper tibial plate and a lower tibial plate opposite the upper tibial plate, the upper and lower tibial plates each including an outer sidewall that defines an outer edge of the tibial plate and an inner sidewall that defines a centrally-located aperture that is spaced apart from the outer sidewall such that the inner sidewalls of the upper and lower tibial plates completely enclose a cylindrical passageway that is spaced apart from the outer sidewalls when the upper tibial plate is coupled to the lower tibial plate, a sensor array positioned between the upper tibial plate and the lower tibial plate and configured to generate sensor signals indicative of a joint force between the patient'"'"'s tibia and femur, the sensor array comprising a plurality of anterior sensors to measure an anterior force component of the joint force and a plurality of posterior sensors to measure a posterior component of the joint force, each of the posterior sensors having a surface area that is greater than each of the anterior sensors, a first display secured to a first surface of the housing and a second display secured to a second surface of the housing opposite the first surface, and a circuit positioned in the housing and configured to receive the sensor signals from the sensor array and to control the first and second displays to illuminate in one of a plurality of illumination configurations, each illumination configuration corresponding to a separate range of medial-lateral balance of the joint force. - View Dependent Claims (14, 15, 16, 17, 18, 22, 23)
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24. A sensor module to measure a joint force of a patient'"'"'s joint, the sensor module comprising:
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a housing having a handle and a tibial paddle, the tibial paddle including an upper tibial plate and a lower tibial plate opposite the upper tibial plate, the upper and lower tibial plates each including an outer sidewall that defines an outer edge of the tibial plate and an inner sidewall that defines an aperture that is spaced apart from the outer sidewall such that the inner sidewalls of the upper and lower tibial plates completely enclose a cylindrical passageway extending through the tibial paddle when the upper tibial plate is coupled to the lower tibial plate, a sensor array positioned between the upper tibial plate and the lower tibial plate and configured to generate sensor signals indicative of a joint force between the patient'"'"'s tibia and femur, the sensor array comprising a plurality of anterior sensors to measure an anterior force component of the joint force and a plurality of posterior sensors to measure a posterior component of the joint force, each of the posterior sensors having a surface area that is greater than each of the anterior sensors, a first display secured to a first surface of the housing, and a circuit positioned in the housing and configured to receive the sensor signals from the sensor array and to control the first display to provide a visual indication of the medial-lateral balance of the joint force.
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Specification