ELECTROSURGICAL SYSTEM
First Claim
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1. A method for controlling an output of an electrosurgical generator operatively coupled to a bipolar electrosurgical device, comprising:
- measuring a phase angle of a first measurement signal applied to tissue of a patient via at least one electrode of the electrosurgical device, the first measurement signal applied to the tissue prior to treatment of the tissue by the electrosurgical device;
determining a target phase angle using the phase angle of the first measurement signal;
following delivery of a treatment signal to the tissue, measuring the phase angle of a second measurement signal applied to the tissue, the treatment signal capable of causing modification of the tissue; and
ceasing delivery of the treatment signal to the tissue when the phase angle of the second measurement signal reaches the target phase angle.
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Abstract
Phase end point determination is provided to automatically halt the application of energy to tissue. Prior to the application of energy, the phase end point determination is identified by measuring the product of permittivity and conductivity of the tissue to be treated.
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Citations
11 Claims
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1. A method for controlling an output of an electrosurgical generator operatively coupled to a bipolar electrosurgical device, comprising:
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measuring a phase angle of a first measurement signal applied to tissue of a patient via at least one electrode of the electrosurgical device, the first measurement signal applied to the tissue prior to treatment of the tissue by the electrosurgical device; determining a target phase angle using the phase angle of the first measurement signal; following delivery of a treatment signal to the tissue, measuring the phase angle of a second measurement signal applied to the tissue, the treatment signal capable of causing modification of the tissue; and ceasing delivery of the treatment signal to the tissue when the phase angle of the second measurement signal reaches the target phase angle. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling an output of an electrosurgical generator operatively coupled to a bipolar electrosurgical device, comprising:
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determining permittivity and conductivity of tissue of a patient using a measurement signal, the measurement signal applied to tissue of a patient via at least one electrode of the electrosurgical device, the measurement signal applied to the tissue prior to modification of the tissue by the electrosurgical device; determining a threshold phase angle based on the permittivity and the conductivity of the tissue; measuring a phase angle of a signal applied to the tissue; and ceasing the delivery of the treatment signal to the tissue when the phase angle of the signal reaches the threshold phase angle.
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7. A method of characterizing tissue prior to the delivery of electrosurgical energy to the tissue via a bipolar electrosurgical device, comprising:
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measuring phase angle of a measurement signal applied to tissue of a patient via at least one electrode of the electrosurgical device, the measurement signal applied to the tissue at a predetermined frequency prior to modification of the tissue by the electrosurgical device; determining the product of the relative permittivity and conductivity of the tissue using the phase angle measurement and the predetermined frequency; characterizing the tissue based on the product of the relative permittivity and conductivity of the tissue. - View Dependent Claims (8, 9, 10)
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11. A method of characterizing tissue prior to the delivery of electrosurgical energy to the tissue via a bipolar electrosurgical device, comprising:
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generating a measurement signal applied to tissue of a patient positioned between at least two jaw members of an electrosurgical device, at least one of the jaw members comprising an electrode, the measurement signal delivered to the tissue via the electrode and applied to modification of the tissue by the electrosurgical device; determining a treatment endpoint condition using the measurement signal, the treatment endpoint condition determined substantially independent of the dimensions of the tissue positioned between the at least two jaw members; and stopping delivery of a treatment signal to the tissue when the treatment endpoint condition is reached, the treatment signal capable of causing modification of the tissue.
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Specification