Automatic matching method of ultrasonic scalpel host, ultrasonic scalpel system and transducer impedance of ultrasonic scalpel system

Abstract

The invention provides an automatic matching method for the ultrasonic knife host, the ultrasonic knife system, and the transducer impedance of the ultrasonic knife system. The ultrasonic knife system obtains the real-time static capacitance of the ultrasonic transducer through calculation, and combines the operating frequency range of the ultrasonic knife system , calculate the value range of the matching inductance, and then select the appropriate inductance from the transducer matching circuit to connect to the ultrasonic transducer, which can effectively change the static capacitance of the ultrasonic transducer and the operating frequency range of the ultrasonic knife system dynamically. Adjust the inductance value of the matching inductance to achieve the maximum matching, so that the ultrasonic transducer works in the optimal state; in addition, if the inductance matching fails, it means that the ultrasonic transducer is seriously aging and may not work normally, and the ultrasonic transducer needs to be replaced. After the transducer is re-matched to the inductance, the indirect inspection of the working state of the ultrasonic transducer further ensures the maximum matching between the ultrasonic transducer and the matching inductance, and improves the working efficiency of the ultrasonic transducer.

Description

technical field [0001] The invention relates to the technical field of ultrasonic knife, in particular to an ultrasonic knife host, an ultrasonic knife system and an automatic matching method for transducer impedance of the ultrasonic knife system. Background technique [0002] Ultrasonic knife (ultrasonic cutting hemostatic knife) is a common surgical scalpel, which has the characteristics of less trauma, less smoke, and blood coagulation during the operation, so it can be widely used in surgery. The ultrasonic knife (system) is composed of an ultrasonic knife main unit, an ultrasonic transducer and an ultrasonic knife head. Its working principle is that the ultrasonic knife main unit generates a power source of a certain frequency to the ultrasonic transducer, and the ultrasonic transducer generates mechanical vibration of this frequency Driving the ultrasonic cutter head also produces mechanical vibrations. Because of the high frequency and small amplitude, it can cut sma...

AI Technical Summary

Problems solved by technology

But because of the static capacitance C 0 The existence of the ultrasonic transducer makes the ultrasonic transducer capacitive, even if it works at the series resonance frequency point, it also limits the efficiency of the ultrasonic transducer, and with the current technology, the static capacitance C 0 cannot be eliminated, a common practice is to use a fixed inductance L 0 connected in parallel or in series (such as figure 1 and figure 2 ), so that the inductance L 0 and static capacitance C 0 It also works in the resonant state at the current operating frequency, satisfying Because the static capacitance C 0 relatively fixed, so just choose an appropriate inductance L 0 Match it, you can achieve the goal

[0004] However, during the working process of the ultrasonic knife system, due to the change of the load, the series resonance frequency is not fixed, but changes within a certain range. For example, the frequency of the ultrasonic knife system changes from 55KHz to 56KHz; Capacitance C 0 There are also differences in the size of the ultrasonic transducer, and according to the characteristics of the ultrasonic transducer, the longer the service life, the static capacitance C 0 The value will slowly increase

According to the parallel resonance formula Among them, ω 0 =2πf 0 , the frequency f of the ultrasonic signal 0 and static capacitance C 0 can change the inductance L 0 The value of the value, so the fixed value of the inductance L 0 does not necessarily make the inductance L 0 and static capacitance C 0 Working in the resonance state, although the impedance of the circuit formed by the two is large when it is not in the resonance state, it has little impact on the impedance of the series resonance circuit, but if the ultrasonic knife system works in a high-impedance environment, such as cutting some hard tissues, The impedance will be larger, then the inductance L 0 and static capacitance C 0 The impedance of the loop will have an impact on the impedance of the series loop, which will reduce the work efficiency

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