Electrosurgical high frequency generator
First Claim
1. An electrosurgical high frequency generator comprising a high frequency oscillator and a regulatable power stage connected thereto with a patient current circuit with an active electrode and a single neutral electrode being connectable to the power stage via an output transformer and, wherein at least one parameter sensor is provided at an output circuit and is connected via an interface to a microcomputer which regulates the power stage and detects a parameter characteristic for a treatment of a patient, such as at least one of high frequency voltage high-frequency current and intensity of an arc and produces, via the interface and the microcomputer, a regulating signal for the power stage such that the parameter or parameters are kept at specific values or in specific value ranges in accordance with a present mode of operation, wherein a tissue impedance sensor is additionally provided which is connected to the microcomputer via the interface and comprises:
- an auxiliary voltage source connected to the output circuit or to the patient current circuit, and having substantially lower frequency than the oscillator frequency; and
a detector circuit which recognizes the current transmitted by the auxiliary voltage source and which is connected via the interface to the microcomputer.
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Accused Products
Abstract
An electrosurgical high frequency generator has a high frequency oscillator and, connected thereto, a regulatable power stage to which a patient current circuit with active and neutral electrodes can be connected via an output transformer. Three parameter sensors for the high frequency current, the high frequency voltage and the arc formation are provided at the output circuit and are connected via an interface to a microcomputer which in turn controls the power stage. In accordance with the invention, a tissue impedance sensor is additionally provided which is likewise connected to the microcomputer via the interface.
265 Citations
12 Claims
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1. An electrosurgical high frequency generator comprising a high frequency oscillator and a regulatable power stage connected thereto with a patient current circuit with an active electrode and a single neutral electrode being connectable to the power stage via an output transformer and, wherein at least one parameter sensor is provided at an output circuit and is connected via an interface to a microcomputer which regulates the power stage and detects a parameter characteristic for a treatment of a patient, such as at least one of high frequency voltage high-frequency current and intensity of an arc and produces, via the interface and the microcomputer, a regulating signal for the power stage such that the parameter or parameters are kept at specific values or in specific value ranges in accordance with a present mode of operation, wherein a tissue impedance sensor is additionally provided which is connected to the microcomputer via the interface and comprises:
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an auxiliary voltage source connected to the output circuit or to the patient current circuit, and having substantially lower frequency than the oscillator frequency; and a detector circuit which recognizes the current transmitted by the auxiliary voltage source and which is connected via the interface to the microcomputer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification