Extracorporeal power supply with a wireless feedback system for an implanted medical device
First Claim
1. A medical apparatus comprising an extracorporeal power supply forming a wireless closed loop system with a medical device adapted for implantation into a patient, wherein:
- the medical device comprises a first receiver for a first wireless signal, a power circuit that extracts energy from the first wireless signal to power the medical device, and a feedback signal generator that transmits a second wireless signal having a frequency that varies to indicate an amount of energy extracted from the first wireless signal; and
the extracorporeal power supply comprises a source of electrical power, a power transmitter that emits the first wireless signal, a second receiver for the second wireless signal, a feedback controller connected to the second receiver and the power transmitter to control transmission of the first wireless signal in response to frequency variation of the second wireless signal, the extracorporeal power supply further comprises a source of data specifying an operational parameter for the medical device and a data modulator coupled to the source of data and the power transmitter to modulate the first wireless signal in response to the data, wherein the first wireless signal comprises power pulses which vary in width in response to the second wireless signal, and each power pulse comprises a series of sub-pulses which encode data from the source of data;
wherein the medical device further comprises a data detector for extracting the data from the first wireless signal.
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Accused Products
Abstract
A medical device adapted for implantation into a patient receives electrical power from an extracorporeal power supply. The medical device has a first receiver for a first wireless signal, a power circuit that extracts energy from the first wireless signal to power the medical device, and a feedback signal generator that transmits a second wireless signal indicating a magnitude of energy extracted from the first wireless signal. The extracorporeal power supply includes a source of electrical power and a power transmitter that emits the first wireless signal. A second receiver enables the extracorporeal power supply to receive the second wireless signal. A feedback controller manipulates the first wireless signal in response to the second wireless signal to ensure that sufficient electrical energy is provided to the medical device without wasting electrical power from the source.
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Citations
29 Claims
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1. A medical apparatus comprising an extracorporeal power supply forming a wireless closed loop system with a medical device adapted for implantation into a patient, wherein:
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the medical device comprises a first receiver for a first wireless signal, a power circuit that extracts energy from the first wireless signal to power the medical device, and a feedback signal generator that transmits a second wireless signal having a frequency that varies to indicate an amount of energy extracted from the first wireless signal; and the extracorporeal power supply comprises a source of electrical power, a power transmitter that emits the first wireless signal, a second receiver for the second wireless signal, a feedback controller connected to the second receiver and the power transmitter to control transmission of the first wireless signal in response to frequency variation of the second wireless signal, the extracorporeal power supply further comprises a source of data specifying an operational parameter for the medical device and a data modulator coupled to the source of data and the power transmitter to modulate the first wireless signal in response to the data, wherein the first wireless signal comprises power pulses which vary in width in response to the second wireless signal, and each power pulse comprises a series of sub-pulses which encode data from the source of data; wherein the medical device further comprises a data detector for extracting the data from the first wireless signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A medical apparatus comprising an extracorporeal power supply forming a wireless closed loop system with intravascular medical device adapted for implantation into a patient, wherein:
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the intravascular medical device comprises a first receiver for a first wireless signal, a power circuit that extracts energy from the first wireless signal to power the intravascular device, and a feedback signal generator that transmits a second wireless signal that indicates an amount of energy extracted from the first wireless signal; and the extracorporeal power supply comprises a source of electrical power, a power transmitter that emits the first wireless signal, a second receiver for the second wireless signal, a feedback controller connected to the second receiver and the power transmitter and including a proportional-integral controller that receives an indication of how much the amount of energy extracted from the first wireless signal deviates from a reference energy level and produces an output signal that controls transmission of the first wireless signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for controlling electrical energy delivered from an extracorporeal power supply to a medical device implanted in a patient, the method comprising:
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transmitting, from the extracorporeal power supply, a first wireless signal having an energy level; receiving the first wireless signal at the medical device implanted in a patient; the medical device extracting electrical energy from the first wireless signal; transmitting from the medical device a second wireless signal having a frequency that varies to indicate an amount of electrical energy extracted from the first wireless signal; receiving the second wireless signal at the extracorporeal power supply, wherein the receiving comprises producing a deviation signal that represents a difference between a predefined frequency and the frequency of the second wireless signal; and in response to the frequency of the second wireless signal, manipulating transmission of the first wireless signal to control the energy level, wherein the manipulating is in response to a value equal to an arithmetic difference between a setpoint frequency and the product of a time independent constant gain factor and the time integral of the deviation signal. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification