Abstract: The present disclosure relates to a surgical instrument with a main part with a first punching means and a part movable relative thereto, with a handle arranged on the main part, which includes a stationary grip and a grip which can actuate the movable part, wherein the movable part is releasably connected with a second punching means, and wherein the second punching means can be joined with the first punching means for a punching operation and along with the movable part is movably guidable or guided on the main part.

Abstract: Described is a high-frequency surgical instrument with automatic control of the intensity of the electric arcs between the active electrode and the tissue that is to be cut or coagulated, whereby for determination of the extent of the electric arcs, a therefrom dependent signal (K) is shunted off through a filter and conducted to a rectifier whose output signal is conducted to a variable-gain amplifier in which this output signal is compared either with the set-point signal (S) of a set-point device for the cutting process or with the set-point signal (K) of a set-point device for the coagulation process. The variable-gain amplifier generates a signal proportional to the difference of the signals E minus S or E minus K, respectively, which is conducted to an amplitude modulator which controls the amplitude of the output voltage of the power amplifier.

Abstract: A high frequency surgical apparatus for the thermal coagulation of biologic tissues is described, in which for monitoring the fluctuations in amplitude of the high frequency current during each coagulation process a current monitor (25) is provided, which by means of a current-to-voltage coverter generates an electrical voltage proportional to the amplitude fluctuations of the high frequency current, from which voltage, by means of a first detector, a first direct voltage proportional to the amplitude fluctuations is formed and, by means of a second detector acting as a peak value detector, a second direct voltage is formed that rises in proportion to the amplitude of the high frequency current. The first direct voltage (U.sub.a) and the second direct voltage (kU.sub.b), which is divided downward by an adjustable factor by means of a voltage divider, are supplied to a voltage comparator, the output signal of which sets a bistable circuit as soon as the first direct voltage (U.sub.