Method and apparatus for the high frequency coagulation of protein for surgical purposes
First Claim
1. A method for coagulating protein tissue, comprising the steps of:
- applying a high-frequency signal to the tissue to be coagulated;
measuring the impedance of the tissue, to which the high-frequency signal is applied;
determining the differential quotient of the measured impedance by detecting the change of impedance over time; and
controlling at least one of the power and duration of said high-frequency signal in accordance with said differential quotient.
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Abstract
In the arrangement according to the invention for the high frequency coagulation of protein, in particular for surgical purposes, the protein impedance is continuously determined during application of high frequency power and the differential quotient for the impedance curve is formed according to time. The values of the differential quotient serve on the one hand for adjusting the initial power and on the other hand for establishing the optimal time for switching off the high frequency power. For both situations, provision is made for presettings making the arrangement according to the invention flexible and simple to adapt. The arrangement is preferably intended for bipolar coagulation instruments but use with unipolar instruments is also possible.
261 Citations
15 Claims
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1. A method for coagulating protein tissue, comprising the steps of:
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applying a high-frequency signal to the tissue to be coagulated; measuring the impedance of the tissue, to which the high-frequency signal is applied; determining the differential quotient of the measured impedance by detecting the change of impedance over time; and controlling at least one of the power and duration of said high-frequency signal in accordance with said differential quotient. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for coagulating protein tissue, comprising:
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means for generating a high-frequency signal; means for applying said high-frequency signal to the tissue to be coagulated; means for measuring the impedance of the tissue to which the high-frequency signal is applied; means for detecting the change of the measured impedance over time to thereby determine the differential quotient of the measured impedance; and means for controlling said high-frequency generating means in response to the determined differential quotient. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification