Litz wire battery powered device
First Claim
Patent Images
1. A medical instrument comprising:
- a housing and a handle for gripping by a user, an end effector coupled to the handle and having at least one electrical contact;
a battery;
a radio frequency (RF) generation circuit coupled to and operated by the battery and operable to generate an RF drive signal having a predetermined frequency and phase and to provide the RF drive signal to the at least one electrical contact, wherein the RF generation circuit is supported by the housing; and
a sampling circuit;
wherein the RF generation circuit comprises a resonant circuit comprising at least one inductive element constructed of litz wire;
wherein the sampling circuit is configured to sample a sensed voltage or current signal at a sampling frequency that varies in synchronism with the frequency and phase of the RF drive signal.
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Abstract
A medical instrument is disclosed. The medical instrument includes a housing and a handle for gripping by a user, an end effector coupled to the handle and having at least one electrical contact, a battery, and a radio frequency (RF) generation circuit coupled to and operated by the battery. The RF generation circuit is operable to generate an RF drive signal and to provide the RF drive signal to the at least one electrical contact, wherein the RF generation circuit is supported by the housing. The RF generation circuit includes a resonant circuit that includes at least one inductive element constructed of litz wire.
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Citations
23 Claims
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1. A medical instrument comprising:
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a housing and a handle for gripping by a user, an end effector coupled to the handle and having at least one electrical contact; a battery; a radio frequency (RF) generation circuit coupled to and operated by the battery and operable to generate an RF drive signal having a predetermined frequency and phase and to provide the RF drive signal to the at least one electrical contact, wherein the RF generation circuit is supported by the housing; and a sampling circuit; wherein the RF generation circuit comprises a resonant circuit comprising at least one inductive element constructed of litz wire; wherein the sampling circuit is configured to sample a sensed voltage or current signal at a sampling frequency that varies in synchronism with the frequency and phase of the RF drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A medical instrument comprising:
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a battery operated radio frequency (RF) generation circuit operable to generate an RF drive signal of a predetermined frequency and phase and to provide the RF drive signal to at least one electrical contact, wherein the RF generation circuit comprises a resonant circuit comprising at least one inductive element constructed of litz wire; and a sampling circuit configured to sample a sensed voltage or current signal at a sampling frequency that varies in synchronism with the frequency and phase of the RF drive signal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A medical instrument comprising:
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a battery operated radio frequency (RF) generation circuit operable to generate an RF drive signal and to provide the RF drive signal to the at least one electrical contact; and a control circuit configured to vary the duty cycle of the RF drive signal; and a sampling circuit coupled to the control circuit; wherein the RF generation circuit comprises a resonant circuit comprising at least one inductive element constructed of litz wire; wherein the control circuit is operable to receive a measurement of the RF drive signal and from the sampling circuit and is operable to vary the frequency of the RF drive signal to control the power, voltage and/or current delivered to at least one electrical contact of the end effector; and wherein the sampling circuit is configured to sample a sensed voltage or current signal at a sampling frequency that varies in synchronism with the frequency and phase of the RF drive signal. - View Dependent Claims (21, 22, 23)
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Specification