SU578065A1 - Ultrasonic surgery apparatus - Google Patents

Description

and the input to the output of the generator 1, while the control input of the attenuator 15 is connected to the standard resistor 5 of the measuring circuit of the circuit 3 through the connector of the amplifier 16 and the rectifying bridge 17, which amplifies the amplitude stabilization circuit 18.

The device for ultrasonic surgery is as follows.

At the input of the power amplifier 2, via an attenuator 15, noises are generated from the ultrasound frequency from generator 1. The output from power amplifier 2 is fed to the measuring circuit 3, with which the static inductance of the excitation winding of the converter 4 is compensated. The presence in one of the shoulders of the bridge coil b inductance equal to the value of the inductance of the braked transducer 4, connected in parallel with the transducer .vicuiiuro co-op /, by adjusting which compensates for the electric resistors in the transducer 4, as well as adjusting the resistance to control. schemes in amplitude and phase. iipH ETOL1 siuusoidalpogo voltage received from the diagonal of the circuit to the input of the formation of the matrix and the bi pulse, will correspond to (the current flow to the inverter 4 pa pijjonancnoH frequency. The output at the output of the rotor 9 rectangular impulses received at the first input of the circuit 12 of the pijjonancnoH frequency. The square pulse received at the output of the ripper, the first input of the circuit 12 of the 12 input coincides with the first input of the circuit 12, coinciding with the pijjonancnoH). t from the output of the amplifier 2 power is fed to the input of another shaper 11, for example, the angular pulses of which trigger the one-shot one-edge 10. The output pulses of the one-shot 10, the duration which ne exceeds 1/4 of the excitation panning period of converter 4, the second input of circuit 12 of coincidence is assumed.

In the joint scheme 12, the algebraic subtraction of the above input signals occurs and a pulse is formed on its output, for which the phase shift between the load and the drive current of the converter 4 is generated. This pulse triggers the current generator 13, from the output of which the direct voltage is fed through the integrating circuit PA control input generator 1. The initial frequency of the generator 1 is chosen above the expected resonant frequency of the converter 4.

During iodation, the control input of the generator 1 of a constant voltage causes a decrease in its frequency until the pulse coincides with the output voltage of exem 12 to be minimal, i.e., until the minimum phase shift of the voltage and excitation current of the converter 4 is reached, which corresponds to the value of the resonance frequency of the converter 4.

The presence of the current generator 12 permits zero h; g | 1 practically non-inertial system

adjusting the frequency, since the phase shift in each of the periods of the ultrasonic excitation signal is compared, n to provide the minimum tuning error for the resonant frequency of the transducer 4.

The resistance of the standard resistor 5 (on the order of 0.2 ohm) is much less than the electrical impedance of the converter 4, therefore the voltage drop across it is proportional to the value of the drive current of the converter. This voltage is fed through amplifier 16 and the rectifying bridge 17 to the potential control input of the attenuator 15 and determines the degree of attenuation of the generator 1 signal in it. By varying the gain of the amplifier 16, the magnitude of the drive current of the converter 4 is selected

na idle. When the acoustic load changes on the inverter 4, the magnitude of its excitation current decreases due to the growth of active losses in the converter.

The use of an attenuator 15 in the circuit - amplifier 16, a rectifying bridge 17 - makes it possible to stabilize the excitation current of the converter 4 over a wide range determined by the dynamic attenuation range of the attenuator 15, and therefore to stabilize the amplitude of the mechanical oscillations of the converter.

Such a device provides a change of working tool directly

during the operation without adjusting and adjusting the device.

Claims (2)

1. An ultrasonic surgery device comprising an ultrasonic frequency oscillator, a power amplifier, an attenuator, a measuring circuit and an amplitude stabilization circuit, characterized in that, in order to ensure that the working tool is replaced directly during the operation without adjusting and adjusting the device, It has an automatic frequency control scheme, made in the form of two pulse shapers and a series-connected one-shot, one matching, current generator and integrating circuit, the inputs of the pulse shapers are connected to the outputs of the measuring circuit, and the outputs of the pulse shapers of the connection circuit correspond with the one-shooter and the assembly, and the output of the integrating value of the connections with the oscillator is an ultrasonic signal. 2. The device according to claim 1, characterized in that the amplitude stabilization scheme is made in the form of series-connected an amplifier and amplifier bridge connected to an attenuator connected between the ultrasonic frequency oscillator and the amplifier, and the amplifier input is connected to the output of the measuring circuit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 307817, cl. B 06B 1/08, 1968.