Medical device
First Claim
Patent Images
1. A medical device comprising:
- a handle for gripping by a user, an end effector coupled to the handle and having at least one electrical contact;
a radio frequency (RF) generation circuit coupled to the handle and 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 comprises a resonant circuit; and
a control circuit comprising a sampling circuit, wherein the control circuit is configured to vary a frequency of the RF drive signal around a resonant frequency of the resonant circuit and configured to determine the frequency and a phase of the RF drive signal and generate a sampling frequency, and wherein the sampling circuit is configured to sample a sensed voltage signal or a sensed current signal at the sampling frequency, such that the sampling frequency is synchronized with the frequency and the phase of the RF drive signal.
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Abstract
A medical device is described having a handle and an end effector coupled to the handle. The end effector has at least one electrode for providing electrical signals to a tissue or vessel to be treated. An RF drive circuit is provided for generating an RF drive signal that is applied to the end effector electrode. The RF drive circuit includes a resonant circuit and a frequency controller is used to vary the frequency of a signal passed through the resonant circuit in order to control the power supplied to the end effector electrode.
1369 Citations
14 Claims
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1. A medical device comprising:
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a handle for gripping by a user, an end effector coupled to the handle and having at least one electrical contact; a radio frequency (RF) generation circuit coupled to the handle and 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 comprises a resonant circuit; and a control circuit comprising a sampling circuit, wherein the control circuit is configured to vary a frequency of the RF drive signal around a resonant frequency of the resonant circuit and configured to determine the frequency and a phase of the RF drive signal and generate a sampling frequency, and wherein the sampling circuit is configured to sample a sensed voltage signal or a sensed current signal at the sampling frequency, such that the sampling frequency is synchronized with the frequency and the phase of the RF drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device comprising:
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a handle for gripping by a user; an end effector coupled to the handle and having at least one electrical contact; a 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; a frequency dependent attenuator comprising a resonant circuit; and a control circuit comprising a sampling circuit, wherein the control circuit is operable to vary a frequency of the RF drive signal around a resonant frequency of the resonant circuit to control at least one of a power, a voltage or a current provided to the at least one contact of the end effector and is configured to determine the frequency and a phase of the RF drive signal and generate a sampling frequency, and wherein the sampling circuit is configured to sample a sensed voltage signal or a sensed current signal at the sampling frequency, such that the sampling frequency is synchronized with the frequency and the phase of the RF drive signal. - View Dependent Claims (12, 13, 14)
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Specification