W&h Dentalwerk Burmoos Gmbh

W&h Dentalwerk B&uuml;rmoos Gmbh

Roland Sevcik

Johann J Eibl

Christian Pruckner

Wolfgang Wendtner

Harald Schörghofer

Rainer Mackinger

Dieter Köbel

Johann Fersterer

A medical treatment device comprises a sensor to detect operating states of the medical treatment device, wherein the sensor comprises a first electrode, a second electrode and impedance means. The first electrode is arranged between a current path input and a current path output, wherein an electric input signal for powering the medical treatment device is applicable to the current path input, and the current path output is configured to couple to a load of the medical treatment device. The second electrode is separated from the first electrode by a first dielectric material, the second electrode comprising a first signal terminal for obtaining a first sensor signal. The impedance means are separated from the first electrode by a second dielectric material and comprise a second signal terminal for obtaining a second sensor signal. The first electrode comprises a cross section perpendicular to the direction of propagation of the electric input signal such that the first electrode and the second electrode are coupled to provide a capacitance as first sensor signal, and wherein the impedance means are formed as a structured electrode such that the first electrode and the impedance means are coupled to provide an impedance as second sensor signal.

Medical treatment device

A brushless electric motor which has a rotor magnet, a coil apparatus for electromagnetically driving the rotor magnet, a rotor shaft for transmitting a rotary movement, which is firmly connected to the rotor magnet and runs through a rotation axis of the rotor magnet, and at least one electromagnetic transducer element for detection of the magnetic field of the rotor magnet, in which the at least one electromagnetic transducer element is arranged outside the axial extent of the rotor magnet with respect to the rotation axis, and is arranged essentially within the maximum radial extent of the rotor magnet. The invention also relates to an instrument for a medical, in particular a dental, apparatus having a brushless electric motor such as this.

Brushless electric motor and instrument for a medical apparatus

In a method for controlling a torque of a motor of dental and surgical handpieces to not exceed a set-point value when screwing in implant members, a motor current for applying the set-point torque is determined immediately before screwing in an implant member with the handpiece and the motor current is limited to the set point value with a motor control during subsequent screwing in of the implant member. The device for carrying out the method has a torque limiter, connectable to a tool receptacle of a handpiece, and a motor current measuring device for measuring a motor current of the motor of the handpiece.

Method and device for limiting the torque of dental and surgical handpieces

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Bad Reichenhall, Germany

Roland Sevcik