Digital wireless position sensor
First Claim
1. A method for tracking an object, comprising:
- positioning a radio frequency (RF) driver to radiate an RF driving field toward the object;
fixing to the object a wireless transponder comprising a power coil and at least one sensor coil;
receiving the RF driving field using the power coil and storing electrical energy derived therefrom;
driving a plurality of field generators to generate electromagnetic fields at respective frequencies in a vicinity of the object that induce a voltage drop across the at least one sensor coil;
generating a digital output signal at the wireless transponder indicative of the voltage drop across the sensor coil, and powering the generation of the digital output signal using the stored electrical energy;
transmitting the digital output signal from the wireless transponder using the power coil, and powering the transmission of the digital output signal using the stored electrical energy; and
receiving and processing the digital output signal to determine coordinates of the object;
wherein receiving the RF driving field comprises receiving the RF driving field;
(a) during a first time period, prior to driving the plurality of field generators, and(b) during a second time period, subsequent to the first time period and prior to transmitting the digital output signal,wherein storing the electrical energy derived from the RF driving field comprises storing a first electrical energy during the first time period and storing a second electrical energy during the second time period,wherein powering the generation of the digital output signal comprises powering the generation of the digital output signal using the first stored electrical energy, andwherein powering the transmission of the digital output signal comprises powering the generation of the digital output signal using the second stored electrical energy.
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Accused Products
Abstract
A method is provided for tracking an object, including positioning a radio frequency (RF) driver to radiate an RF driving field toward the object, and fixing to the object a wireless transponder that includes a power coil and at least one sensor coil. The method also includes receiving the RF driving field using the power coil and storing electrical energy derived therefrom. A plurality of field generators are driven to generate electromagnetic fields at respective frequencies in a vicinity of the object that induce a voltage drop across the at least one sensor coil. A digital output signal is generated at the wireless transponder indicative of the voltage drop across the sensor coil, and the generation of the digital output signal is powered using the stored electrical energy. The digital output signal is transmitted from the wireless transponder using the power coil, and the transmission of the digital output signal is powered using the stored electrical energy. The digital output signal is received and processed to determine coordinates of the object.
1419 Citations
31 Claims
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1. A method for tracking an object, comprising:
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positioning a radio frequency (RF) driver to radiate an RF driving field toward the object; fixing to the object a wireless transponder comprising a power coil and at least one sensor coil; receiving the RF driving field using the power coil and storing electrical energy derived therefrom; driving a plurality of field generators to generate electromagnetic fields at respective frequencies in a vicinity of the object that induce a voltage drop across the at least one sensor coil; generating a digital output signal at the wireless transponder indicative of the voltage drop across the sensor coil, and powering the generation of the digital output signal using the stored electrical energy; transmitting the digital output signal from the wireless transponder using the power coil, and powering the transmission of the digital output signal using the stored electrical energy; and receiving and processing the digital output signal to determine coordinates of the object; wherein receiving the RF driving field comprises receiving the RF driving field; (a) during a first time period, prior to driving the plurality of field generators, and (b) during a second time period, subsequent to the first time period and prior to transmitting the digital output signal, wherein storing the electrical energy derived from the RF driving field comprises storing a first electrical energy during the first time period and storing a second electrical energy during the second time period, wherein powering the generation of the digital output signal comprises powering the generation of the digital output signal using the first stored electrical energy, and wherein powering the transmission of the digital output signal comprises powering the generation of the digital output signal using the second stored electrical energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for tracking an object, comprising:
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radiating a radio frequency (RF) driving field toward the object;
receiving the RF driving field at the object, and storing electrical energy derived therefrom;subsequently to storing the electrical energy, generating a plurality of electromagnetic fields at respective frequencies in a vicinity of the object; using the stored electrical energy, generating a digital output signal indicative of respective strengths of the electromagnetic fields at the object; transmitting the digital output signal from the object; and receiving and processing the digital output signal to determine coordinates of the object; wherein receiving the RF driving field comprises receiving the RF driving field; (a) during a first time period, prior to generating the plurality of electromagnetic fields, and (b) during a second time period, subsequent to the first time period and prior to transmitting the digital output signal, wherein storing the electrical energy derived from the RF driving field comprises storing a first electrical energy during the first time period and storing a second electrical energy during the second time period, wherein generating the digital output signal comprises generating the digital output signal using the first stored electrical energy, and wherein transmitting the digital output signal comprises transmitting the digital output signal using the second stored electrical energy. - View Dependent Claims (13)
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14. A method for tracking an object, comprising:
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radiating a radio frequency (RF) driving field toward the object; receiving the RF driving field at the object, and storing electrical energy derived therefrom; subsequently to storing the electrical energy, generating a plurality of electromagnetic fields at respective frequencies in a vicinity of the object;
using the stored electrical energy, generating an output signal indicative of respective strengths of the electromagnetic fields at the object;transmitting an output signal from the object; and
receiving and processing the output signal to determine coordinates of the object;wherein receiving the RF driving field comprises receiving the RF driving field; (a) during a first time period, prior to generating the plurality of electromagnetic fields, and (b) during a second time period, subsequent to the first time period and prior to transmitting the digital output signal, wherein storing the electrical energy derived from the RF driving field comprises storing a first electrical energy during the first time period and storing a second electrical energy during the second time period, wherein generating the digital output signal comprises generating the digital output signal using the first stored electrical energy, and wherein transmitting the digital output signal comprises transmitting the digital output signal using the second stored electrical energy. - View Dependent Claims (15)
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16. Apparatus for tracking an object, comprising:
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(a) a radio frequency (RF) driver, adapted to radiate an RF driving field toward the object; (b) a plurality of field generators, adapted to generate electromagnetic fields at respective frequencies in a vicinity of the object; (c) a wireless digital transponder, fixed to the object, the transponder comprising; a power coil, coupled to receive the RF driving field; a power storage device, adapted to store electrical energy derived from the RF driving field; at least one sensor coil, coupled so that a voltage drop is induced across the at least one sensor coil responsive to the electromagnetic fields; and a control circuit, coupled to the at least one sensor coil and to the power storage device, and adapted to use the stored electrical energy to generate a digital output signal indicative of the voltage drop and adapted to use the stored electrical energy to drive the power coil to transmit the digital output signal; and (d) a signal receiver, adapted to receive the digital output signal transmitted by the power coil and, responsive thereto, to determine coordinates of the object; wherein the power storage device is adapted to store a first electrical energy derived from the RF driving field during a first time period, wherein the control circuit is adapted to use the first stored electrical energy to generate the digital output signal, wherein the power storage device is adapted to store second electrical energy derived from the RF driving field during a second time period, following the first time period and following the generating by the control circuit of the digital output signal, and wherein the control circuit is adapted to use the second stored electrical energy to drive the power coil to transmit the digital output signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A wireless position transponder for operation inside a body of a subject, the transponder comprising:
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at least one sensor coil, coupled so that a voltage drop across the at least one sensor coil is induced responsive to one or more electromagnetic fields applied to the body in a vicinity of the transponder; an arithmetical logic unit (ALU), coupled to the at least one sensor coil so as to generate a digital output signal indicative of the voltage drop across the at least one sensor coil, such that the digital output signal is indicative of coordinates of the transponder inside the body; a power coil, adapted to receive a radio frequency (RF) driving field applied to the body in the vicinity of the transponder, and coupled to convey electrical energy derived from the driving field to the ALU, and further coupled to transmit the digital output signal generated by the ALU so that the signal can be received by processing circuitry outside the body for use in determining the coordinates; and a power storage device, adapted to store the electrical energy conveyed by the power coil, and to convey the stored electrical energy to the ALU, wherein the ALU is adapted to use the electrical energy conveyed thereto by the power storage device to power the generation of the digital output signal and to power the transmission of the digital output signal; wherein the power storage device is adapted to store first electrical energy derived from the RF driving field during a first time period, wherein the control circuit is adapted to use the first stored electrical energy to generate the digital output signal, wherein the power storage device is adapted to store second electrical energy derived from the RF driving field during a second time period, following the first time period and following the generating by the control circuit of the digital output signal, and wherein the control circuit is adapted to use the second stored electrical energy to drive the power coil to transmit the digital output signal. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification