Erbe Elektromedizin Gmbh

Sandra Keller

Marc Kegreiss

Michael Ederer

Björn Seitz

Markus D Enderle

Katrin Hahn

An arrangement having a device for providing high-frequency voltage Ufor contact coagulation of the biological tissue. The device is equipped to operate with a high voltage that is normally not suitable for contact coagulation, but otherwise used for spark coagulation, for example, more than 400V at the beginning of the contact coagulation. During the operation of the generator the tissue impedanceis monitored. This can occur by means of continuously measuring the voltage Uof the flowing current Iand the phasing &#x3c6; between the voltage and the flowing current. Using both, the measuring unit continuously determines the tissue impedance. A minimum detector is provided to determine if an impedance minimumhas passed through and if such is found, to induce the generator control to reduce the voltage Udelivered by the device to a value that avoids spark generation as well as desiccation of the tissue.

Arrangement for contact coagulation of biological tissue

A device for detecting metal with sparking electrosurgical instruments. The device contains a metal detector, which decides, on the basis of the current and voltage delivered to the instrument, whether a spark originating from the instrument contacts biological tissue or a metal part. The component of the current is determined that is inconsistent with a linear equivalent circuit. The elements of the linear equivalent circuit may be determined in a regression calculation. As first decision criterion, the spark characteristic variable Fis determined from the current. As second decision criterion, a resistance characteristic variable R is determined, which characterizes the tissue resistance. Both characteristic variables are compared with threshold values. If the tissue resistance falls below the resistance threshold value and the spark characteristic variable exceeds the spark size threshold value, a signal is generated that characterizes the activation of the spark against a metal part.

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Hechingen, Germany

Sandra Keller