System for cutting biological tissue
First Claim
1. A system for controlling the operation of a high frequency biological tissue cutting device comprising;
- an amplitude adjustable high frequency generator (2) for delivering a high frequency voltage to a cutting probe (7);
at least one adjustment device (3) for adjusting at least one of several characteristic quantities (K) of voltage, current, impedance and frequency of said high frequency generator;
an indicator device (4) connected to said adjustment device (3) providing an output signal representing the actual size and intensity of an electric arc at said cutting probe (7);
a desired value transmitter (5) for providing a desired value representing a desired size and intensity of said electric arc;
an evaluation unit (6) receiving outputs from said indicator device (4) indicating values representing an actual size and intensity of said electric arc and said desired value transmitter (5) representing a desired size and intensity of said electric arc and producing an output signal to said adjustment device;
means for controlling the output signal from said evaluation unit (6) so that an upward adjustment is substantially slower than a downward adjustment;
whereby said control system continuously adjusts the output of said high frequency generator according to the tissue conditions of said cutting probe.
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Accused Products
Abstract
A system for controlling the operation of a high frequency biological tissue cutting device for cutting biological tissue with high-frequency current having a HF generator component designed so that the amplitude of the voltage (UG) applied to the tissue can be changed. At least one adjustment device is provided to adjust one of the characteristic values (K) of the high frequency generator component to a 1st desired value (b), related to the output of an indicator device that indicates by an electrical signal (d) the size and intensity of the electric arc occurring between the surgical probe and the tissue during cutting. A desired-value transmitter provides a second desired value (c) representing the desired size and intensity of the electric arc. An evaluation unit receives the output signal (d) of the indicator device and the 2nd desired value representing the intensity of the electric arc (c) and provides therefrom a desired value (b) output for the adjustment device such that the maximum changing speed of the desired value (b) is at least one magnitude smaller than the speed with which the adjustment device adjusts the characteristic value (K) of the high-frequency generator component.
170 Citations
16 Claims
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1. A system for controlling the operation of a high frequency biological tissue cutting device comprising;
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an amplitude adjustable high frequency generator (2) for delivering a high frequency voltage to a cutting probe (7); at least one adjustment device (3) for adjusting at least one of several characteristic quantities (K) of voltage, current, impedance and frequency of said high frequency generator; an indicator device (4) connected to said adjustment device (3) providing an output signal representing the actual size and intensity of an electric arc at said cutting probe (7); a desired value transmitter (5) for providing a desired value representing a desired size and intensity of said electric arc; an evaluation unit (6) receiving outputs from said indicator device (4) indicating values representing an actual size and intensity of said electric arc and said desired value transmitter (5) representing a desired size and intensity of said electric arc and producing an output signal to said adjustment device; means for controlling the output signal from said evaluation unit (6) so that an upward adjustment is substantially slower than a downward adjustment; whereby said control system continuously adjusts the output of said high frequency generator according to the tissue conditions of said cutting probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification