Device for tissue treatment and method for electrode positioning
AssigneeErbe Elektromedizin GmbH
InventorsSandra Keller, Kathrin Hahn, Bjoern Seitz
Life of this patent
Estimating the term…
Abstract
An instrument (14) is suitable for treatment of lung tumors and other tissues and a respective apparatus (15) detects the correct positioning of instrument (14) and its two electrodes (19, 20) in a suitable target tissue by observation of two parameters (G1, G2) and particularly their time-dependent change. If the change (V1, V2) of the two parameters (G1, G2) exceeds defined thresholds (S1, S2) respectively, a contact between the instrument and the tissue to be treated and thus also the positioning of the instrument in a desired position can be derived therefrom. This remarkably increases treatment safety.
Claims18
An electrosurgical device for electro-thermal treatment of biological tissue, the electrosurgical device comprising:
- an instrument configured to penetrate the biological tissue and including a body having a first electrode and at least one second electrode arranged proximally to the first electrode which are configured to be supplied with a radio frequency test voltage and with a radio frequency treatment voltage;
- an apparatus that comprises an electrosurgical generator that is configured to supply the first and at least one second electrodes of the instrument with the radio frequency test voltage and to detect a resulting current thereby;
- and
- a control device that is configured to determine from the radio frequency test voltage and the current a first parameter that depends on an effective impedance between the first and at least one second electrodes and a second parameter that depends on a phase angle between the radio frequency test voltage and the current;
- wherein the control device is further configured to determine whether:
- a first change of the first parameter exceeds a first threshold, and
- a second change of the second parameter exceeds a second threshold;
- wherein the first parameter is an impedance, and the second parameter is a power factor;
- wherein the first threshold is a decrease of 60%.
An electrosurgical device for electro-thermal treatment of biological tissue, the electrosurgical device comprising:
- an instrument configured to penetrate the biological tissue and including a body having a first electrode and at least one second electrode arranged proximally to the first electrode which are configured to be supplied with a radio frequency test voltage and with a radio frequency treatment voltage;
- an apparatus that comprises an electrosurgical generator that is configured to supply the first and at least one second electrodes of the instrument with the radio frequency test voltage and to detect a resulting current thereby;
- and
- a control device that is configured to determine from the radio frequency test voltage and the current a first parameter that depends on an effective impedance between the first and at least one second electrodes and a second parameter that depends on a phase angle between the radio frequency test voltage and the current;
- wherein the control device is further configured to determine whether:
- a first change of the first parameter exceeds a first threshold, and
- a second change of the second parameter exceeds a second threshold;
- wherein the first parameter is an impedance and the second parameter is a power factor;
- wherein the second threshold is an increase of 20%.
Dependencies are inferred from the claim text.