Wireless power modulation telemetry for measuring a parameter of the muscular-skeletal system

• US 9,125,627 B2
• Filed: 06/29/2010
• Issued: 09/08/2015
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: OrthoSensor, Inc (Stryker Corporation)
• Inventors: Stein, Marc
• Primary Examiner(s): Obiniyi, Paul
• Application Number:
  US12/825,716
• Publication Number:
  US 20100328077A1
• Time in Patent Office: 1,897 Days
• Field of Search: 340/573.1, 340/539.12, 340/539.3, 340/538.15, 340/538.16, 340/538.17, 340/539.11, 340/539.19, 340/539.21, 340/539.23, 340/539.24, 600/587, 600/382, 623/18.11, 623/18.12
• US Class Current: 1/1
• 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 5/6846 specially adapted to be brought in contact with an internal body part, i.e. invasive
• CPC Class Codes: A61B 5/6878 Bone
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61B 8/15 Transmission-tomography

Abstract

A sensing insert device (100) is disclosed for measuring a parameter of the muscular-skeletal system. The sensing insert device (100) can be temporary or permanent. Used intra-operatively, the sensing insert device (100) comprises an insert dock 202 and a sensing module 200. The sensing module (200) is a self-contained encapsulated measurement device having at least one contacting surface that couples to the muscular-skeletal system. The sensing module (200) comprises one or more sensors (303), electronic circuitry (307), and communication circuitry (320). The electronic circuitry (307) operatively couples to the one or more sensors (303) to measure the parameter. A transmitter (309) transmits parameter measurements. An induction coil (1404) is coupled electromagnetically to a wireless energy source (1402). The induction coil converts electromagnetic energy waves to a signal that powers the sensing module (200). The signal includes information or data. The signal is demodulated to capture the data or information.

Claims

1. A system to measure a parameter of the muscular-skeletal system including a sensing module having at least one passive sensor therein configured to measure the parameter and having two-way communication capability comprising:

a transmitter configured to transmit information via a radio frequency signal;

a demodulation circuit, where the demodulation circuit is configured to demodulate a signal; and

an induction coil configured to receive a modulated signal on a modulated carrier wave through electromagnetic coupling, where the modulated carrier wave is sent from a wireless energy source, where the demodulation circuit extracts the modulated signal from the modulated carrier wave, where the modulated signal on the carrier wave is produced by a wireless energy source which modulates the power signal to transmit power wirelessly while conveying data by the modulated signal, and where the sensing module, the transmitter, the demodulation circuit and the induction coil are contained within a single unit, where the transmitter is configured to wirelessly send one or more data packets and where each data packet comprises parameter measurements and a priority level, where the transmit information and the receive information are wirelessly sent at different frequencies, where transmit information and receive information are transmitted and received simultaneously, where the sensing module further includes;

one or more sensors configured to be coupled to the muscular-skeletal system, where at least one sensor measures load;

electronic circuitry operatively coupled to the sensors; and

the transmitter coupled to the electronic circuitry for receiving parameter measurements to transmit and where the wireless energy source modulates the power signal about a resonance frequency to transmit power wirelessly while conveying data by the modulated signal, where the sensing module further includes;

a rectifier coupled to the induction coil to rectify the signal;

a regulator coupled to the rectifier;

a capacitor coupled to the regulator where the regulator regulates a voltage on the capacitor; and

power management circuitry operatively coupled to the electronic circuitry and the capacitor.

2. The system of claim 1 where the induction coil is configured to charge a capacitor with the carrier wave.

3. The system of claim 2 further including:

a rectifier coupled to the induction coil to rectify the electromagnetic signal;

a regulator coupled to the rectifier;

the capacitor coupled to the regulator where the regulator regulates a voltage on the capacitor; and

power management circuitry operatively coupled to the electronic circuitry and the capacitor.

4. The system of claim 1 where an external wireless energy source includes a modulation circuit to couple data or information on the carrier wave and where the external wireless energy source includes at least one data input.

5. The system of claim 1 where the receive information sets a control operation of the sensing module.

6. A method to provide a data downlink to a sensing module, where the sensing module includes a passive sensor, a transmitter and a receiver, where the sensing module is contained within a single unit and where the sensing module is coupled to the muscular-skeletal system, comprising the steps of:

modulating input data on a modulated carrier wave of a power signal;

transmitting the power signal to the sensing module;

sensing the power signal on at least one induction coil in the sensing module;

demodulating the input data from the modulated carrier wave of the power signal where the input data is provided to circuitry of the sensing module;

charging a power source in the sensing module with the power signal;

enabling the sensing module to measure a parameter of the muscular-skeletal system; and

measuring the parameter of the muscular-skeletal system where the measurement sensor is within the sensing module, where the transmitter is configured to wirelessly send one or more data packets and where each data packet comprises parameter measurements and a priority level, where the transmit information and the receive information are wirelessly sent at different frequencies, where transmit information and receive information are transmitted and received simultaneously, where the sensing module further includes;

one or more sensors configured to be coupled to the muscular-skeletal system, where at least one sensor measures load;

electronic circuitry operatively coupled to the sensors; and

the transmitter coupled to the electronic circuitry for receiving parameter measurements to transmit and where the wireless energy source modulates the power signal about a resonance frequency to transmit power wirelessly while conveying data by the modulated signal, where the sensing module further includes;

a rectifier coupled to the induction coil to rectify the signal;

a regulator coupled to the rectifier;

a capacitor coupled to the regulator where the regulator regulates a voltage on the capacitor; and

power management circuitry operatively coupled to the electronic circuitry and the capacitor.

7. The method of claim 6 further including the steps of:

acquiring input data on an external wireless energy source; and

encoding input data to include data security.

8. The method of claim 6 further including a step of controlling at least one operation of the sensing module with the input data.

9. The method of claim 8 further a step of transmitting measured parameter data from the sensing module.

10. An insert device for coupling to the muscular-skeletal system comprising:

a sensing module configured to measure a parameter of the muscular-skeletal system where the sensing module comprises;

a load bearing surface;

at least one passive sensor coupled to the load bearing surface, where the sensor measures load;

electronic circuitry operatively coupled to the at least one sensor;

an induction coil coupled to the electronic circuitry configured to receive a modulated signal on a modulated carrier wave coupled thereto electromagnetically, where the modulated carrier wave is sent from a wireless energy source, where the modulated signal on the modulated carrier wave is produced by a wireless energy source which modulates a power signal to transmit power wirelessly while conveying data by the modulated signal, where the at least one sensor, electronic circuitry, and induction coil are housed in the sensing module, where the sensing module is contained within a single unit, where the transmitter is configured to wirelessly send one or more data packets and where each data packet comprises parameter measurements and a priority level, where the transmit information and the receive information are wirelessly sent at different frequencies, where transmit information and receive information are transmitted and received simultaneously, where the sensing module further includes;

one or more sensors configured to be coupled to the muscular-skeletal system, where at least one sensor measures load;

electronic circuitry operatively coupled to the sensors; and

the transmitter coupled to the electronic circuitry for receiving parameter measurements to transmit and where the wireless enemy source modulates the power signal about a resonance frequency to transmit power wirelessly while conveying data by the modulated signal, where the sensing module further includes;

a rectifier coupled to the induction coil to rectify the signal;

a regulator coupled to the rectifier;

a capacitor coupled to the regulator where the regulator regulates a voltage on the capacitor; and

power management circuitry operatively coupled to the electronic circuitry and the capacitor.

11. The insert device of claim 10 where demodulation is used to remove data or information from the modulated carrier wave and where the wireless energy source modulates the power signal about a resonance frequency to transmit power wirelessly while conveying the data or information by the modulated signal.

12. The insert device of claim 11 where a demodulated signal from the induction coil is provided to the electronic circuitry to control at least one operation of the sensing module.

13. The insert device of claim 11 where the electronic circuitry further includes a transmitter configured to receive parameter measurements to transmit and where energy received from the carrier wave charges the capacitor to power the sensing module.