CLASS-E RADIO FREQUENCY AMPLIFIER FOR USE WITH AN IMPLANTABLE MEDICAL DEVICE
First Claim
1. A medical apparatus comprising:
- an extracorporeal power source having a power transmitter that produces a radio frequency signal and an antenna that is connected to the power transmitter, the power transmitter including a source of the radio frequency signal, a Class-E amplifier that comprises a switch;
the power source comprising a pulse width modulator that receives the radio frequency signal and a control signal and in response thereto produces an output signal that is applied to a control input of the switch;
an output sensor which provides a feedback signal indicating an intensity of radio frequency signal applied to the antenna, and wherein the pulse width modulator responds to the feedback signal by varying the output signal; and
a medical device for implantation inside an animal, the medical device receiving the radio frequency signal transmitted from the antenna and deriving an electrical voltage from energy of the radio frequency signal which electrical voltage powers components of the medical device.
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Accused Products
Abstract
A medical apparatus includes an extracorporeal power source that transmits electrical power via a radio frequency signal to a medical device implanted inside an animal. The extracorporeal power source has a Class-E amplifier with a choke and a semiconductor switch connected in series between a source of a supply voltage and circuit ground. An output node of the amplifier is formed between choke and the switch and connected to a transmitter antenna. A shunt capacitor couples the amplifier'"'"'s output node to the circuit ground. Controlled operation of the switch produces bursts of the radio frequency signal that are pulse width modulated to control the amount of energy being sent to the implanted medical device.
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Citations
20 Claims
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1. A medical apparatus comprising:
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an extracorporeal power source having a power transmitter that produces a radio frequency signal and an antenna that is connected to the power transmitter, the power transmitter including a source of the radio frequency signal, a Class-E amplifier that comprises a switch;
the power source comprising a pulse width modulator that receives the radio frequency signal and a control signal and in response thereto produces an output signal that is applied to a control input of the switch;
an output sensor which provides a feedback signal indicating an intensity of radio frequency signal applied to the antenna, and wherein the pulse width modulator responds to the feedback signal by varying the output signal; anda medical device for implantation inside an animal, the medical device receiving the radio frequency signal transmitted from the antenna and deriving an electrical voltage from energy of the radio frequency signal which electrical voltage powers components of the medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 17, 18, 19, 20)
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11. A medical apparatus comprising:
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an extracorporeal power source having a power transmitter and an antenna that is connected to the power transmitter, the power transmitter including a source of a radio frequency signal, a Class-E amplifier that comprises a choke and a switch controlled by the radio frequency signal and connected in series between a source of a supply voltage and circuit ground, with an amplifier output node being formed between choke and the switch and connected to the antenna, and a shunt capacitor coupling the amplifier output node to the circuit ground, an output sensor which provides a feedback signal indicating an intensity of a signal applied to the antenna, and wherein the feedback signal is applied to the source to control production of the radio frequency signal; and a medical device for implantation inside an animal, the medical device receiving the radio frequency signal transmitted from the antenna and deriving an electrical voltage from energy of the radio frequency signal which electrical voltage powers components of the medical device. - View Dependent Claims (12, 15, 16)
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Specification