Ultrasonic transducer control method and control device

Abstract

The present disclosure provides a control method and a control device for an ultrasonic transducer. The control method includes: obtaining a target current flowing through the load that puts the ultrasonic transducer in a resonant state; applying a drive signal to the ultrasonic transducer to generate a load current flowing through the load; and adjusting the drive signal so that the load current is equal to the target current, thereby putting the ultrasonic transducer in the resonant state. Through the above control method, the current flowing through the dynamic branch can be controlled in real time during the operation of the ultrasonic transducer to be equal to the target current, thereby putting the ultrasonic transducer in a resonant state at all times, with the lowest impedance and the highest electromechanical conversion efficiency.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application number 202210249080.9, application date March 15, 2022, and invention name “Control method, control device, surgical equipment and storage medium of ultrasonic transducer”. Technical Field

[0002] The embodiments of the present disclosure relate to a control method, a control device, a surgical device, and a storage medium for an ultrasonic transducer. Background Art

[0003] Ultrasonic scalpel is a common surgical scalpel. It can be widely used in surgical operations due to its characteristics of less trauma, less smoke, and coagulation. Ultrasonic scalpel includes a host, an ultrasonic transducer and an ultrasonic blade. Its working principle is that the host generates a power source of a certain frequency to the ultrasonic transducer, and the ultrasonic transducer generates mechanical vibration of the frequency and drives the ultrasonic blade to generate mechanical vibration. Since its working frequency is generally 20kHz~100kHz, it is a high-frequency electrosurgical device. It acts on human tissue to cut and coagulate, and will not cause side effects such as tissue drying and burns. When the blade is working, no current passes through the human body.

[0004] The core of ultrasonic scalpel is how to drive the ultrasonic transducer to convert electrical energy into mechanical energy. When the ultrasonic scalpel transducer works in the resonant state, the efficiency of converting electrical energy into mechanical energy is the highest, and the service life of the ultrasonic scalpel head will be longer. Therefore, it is necessary to perform impedance matching on the ultrasonic transducer, so that the ultrasonic transducer can always work near the resonance point when the load and external conditions change. Summary of the invention

[0005] Embodiments of the present disclosure provide a control method, a control device, a surgical device, and a storage medium for an ultrasonic transducer.

[0006] According to a first aspect of the present disclosure, a control method for an ultrasonic transducer is provided, wherein the ultrasonic transducer is connected to a load, and the control method comprises: obtaining a target current flowing through the load so that the ultrasonic transducer is in a resonant state; applying a drive signal to the ultrasonic transducer to generate a load current flowing through the load; and adjusting the drive signal so that the load current is equal to the target current, thereby putting the ultrasonic transducer in the resonant state.

[0007] In at least some embodiments, the drive signal includes a drive current, and adjusting the drive signal includes: obtaining the drive current applied to the ultrasonic transducer; and adjusting the load current by adjusting the drive current so that the load current is equal to the target current.

[0008] In at least some embodiments, the driving signal includes a driving current, a driving voltage and a driving frequency, and there is a phase angle between the driving current and the driving voltage. The adjusting of the driving signal includes: obtaining the driving frequency applied to the ultrasonic transducer; and adjusting the driving frequency to adjust the phase angle so that the load current is equal to the target current.

[0009] In at least some embodiments, adjusting the phase angle by adjusting the driving frequency includes: determining a target phase angle and a target frequency corresponding to the target phase angle; adjusting the driving frequency so that the driving frequency is equal to the target frequency, thereby making the phase angle equal to the target phase angle.

[0010] In at least some embodiments, the ultrasonic transducer is equivalent to a static capacitor, which is connected in parallel with the load, and determining the target phase angle includes: obtaining the driving voltage applied to the ultrasonic transducer and the capacitive reactance of the ultrasonic transducer; determining the current flowing through the static capacitor based on the driving voltage and the capacitive reactance; and determining the target phase angle based on the current flowing through the static capacitor and the target current.

[0011] In at least some embodiments, the target phase angle is determined based on the current flowing through the static capacitor and the target current:

[0012]

[0013] Wherein, θ0 is the target phase angle, I2 is the current flowing through the static capacitor, and I0 is the target current.

[0014] In at least some embodiments, determining the target frequency corresponding to the target phase angle includes: performing a frequency scan within a preset frequency range; and during the frequency scan, acquiring a frequency that puts the ultrasonic transducer in the resonant state as the target frequency.

[0015] In at least some embodiments, when the ultrasonic transducer is at the frequency in the resonant state, the impedance of the ultrasonic transducer is minimum.

[0016] In at least some embodiments, the preset frequency range is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; the target frequency is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; and the target phase angle is greater than or equal to 0° and less than or equal to 90°.

[0017] In at least some embodiments, the driving signal includes a driving current, a driving voltage and a driving frequency, and there is a phase angle between the driving current and the driving voltage. The control method also includes: obtaining the driving current and the driving frequency applied to the ultrasonic transducer; adjusting the driving current, and adjusting the driving frequency to adjust the phase angle so that the load current is equal to the target current.

[0018] In at least some embodiments, the load current, the drive current and the phase angle satisfy the following relationship: I1=I×cosθ, where I1 is the load current, I is the drive current, and θ is the phase angle.

[0019] In at least some embodiments, the ultrasonic transducer is connected to an ultrasonic blade head, and the ultrasonic blade head is configured to cut the target tissue; during the process of the ultrasonic blade head cutting the target tissue, the steps of obtaining the target current flowing through the load so that the ultrasonic transducer is in a resonant state, applying a driving signal to the ultrasonic transducer to generate a load current flowing through the load, and adjusting the driving signal so that the load current is equal to the target current, thereby putting the ultrasonic transducer in the resonant state, are repeated until the target tissue is cut.

[0020] According to a second aspect of the present disclosure, a control device for an ultrasonic transducer is provided, wherein the ultrasonic transducer is connected to a load, and the control device comprises: an acquisition unit, configured to acquire a target current flowing through the load so that the ultrasonic transducer is in a resonant state; a driving unit, configured to apply a driving signal to the ultrasonic transducer to generate a load current flowing through the load; and an adjustment unit, configured to adjust the driving signal so that the load current is equal to the target current, thereby putting the ultrasonic transducer in the resonant state.

[0021] According to a third aspect of the present disclosure, there is provided a surgical device, comprising: a host and an ultrasonic transducer connected to the host, wherein the host comprises the aforementioned control device.

[0022] According to a fourth aspect of the present disclosure, a surgical device is provided, comprising: a processor; a memory, comprising one or more computer program modules; wherein the one or more computer program modules are stored in the memory and configured to be executed by the processor, and the one or more computer program modules include instructions for executing the aforementioned control method.

[0023] According to a fifth aspect of the present disclosure, a storage medium is provided for non-temporarily storing computer-readable instructions, which can implement the aforementioned control method when the computer-readable instructions are executed by a computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0025] Figure 1 is an equivalent circuit of the surgical device with ultrasonic transducer disclosed in the present invention;

[0026] Figure 2 It is a connection block diagram of various components of the ultrasonic scalpel according to an embodiment of the present disclosure;

[0027] Figure 3 is an equivalent circuit of a surgical device with an ultrasonic transducer according to an embodiment of the present disclosure;

[0028] Figure 4 A flowchart of a method for controlling an ultrasonic transducer provided in an embodiment of the present disclosure;

[0029] Figure 5 It is a flow chart of executing the step of adjusting the driving signal in the control method of the embodiment of the present disclosure;

[0030] Figure 6 This is a flow chart of the step of adjusting the driving frequency in the control method of the embodiment of the present disclosure;

[0031] Figure 7 A schematic diagram of the relationship between the driving current and the dynamic branch current of an embodiment of the present disclosure;

[0032] Figure 8 This is a flow chart of executing the step of adjusting the driving signal in the control method according to another embodiment of the present disclosure;

[0033] Fig. 9 This is a flow chart of the step of determining a target phase angle in the control method according to an embodiment of the present disclosure;

[0034] Fig.10 It is a flow chart of the step of determining the target frequency in the control method of the embodiment of the present disclosure;

[0035] Fig.11 4 is a block diagram of a control device for an ultrasonic transducer according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0037] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Figure 1 is an equivalent circuit of the surgical device with ultrasonic transducer disclosed in the present invention. The surgical device is, for example, a surgical device such as an ultrasonic scalpel. When the ultrasonic scalpel head cuts the target tissue, the ultrasonic transducer and the ultrasonic scalpel head are in a mechanical resonance state as a whole, which can be equivalent to Figure 1 The circuit is in resonance.

[0039] The equivalent circuit of the ultrasonic transducer is as follows Figure 1 As shown in the dotted box, L1 is the dynamic inductance, C1 is the dynamic capacitance, and R1 is the dynamic resistance, wherein the dynamic inductance L1 is caused by the mass of the transducer, and R1 is caused by the mechanical loss of the transducer. In the present disclosure, the branch of dynamic inductance L1, dynamic capacitance C1 and dynamic resistance R1 is called the dynamic branch. C0 is the static capacitance, which is the capacitance between the two plates of the clamped piezoelectric vibrator, and is connected in parallel with the dynamic branch. R is the load resistance, which is located in the dynamic branch and is connected in series with the dynamic resistance R1, dynamic capacitance C1 and dynamic resistance R1; when there is no load, R is zero.

[0040] During the operation of the ultrasonic scalpel, the ultrasonic scalpel host generates an electrical signal of a certain frequency. This frequency must be able to make the dynamic branch reach the minimum impedance to achieve maximum efficiency. According to the principle of series resonant circuit, the frequency must meet the following requirements: At this time, the ultrasonic transducer works in the series resonance state, and the dynamic branch is equivalent to only the dynamic resistance R1, with the minimum impedance and the highest efficiency. However, due to the existence of static capacitance C0, the ultrasonic transducer is capacitive, which limits the working efficiency of the ultrasonic transducer even if it works at the series resonance frequency point.

[0041] like Figure 1 As shown, in order to improve the working efficiency of the ultrasonic transducer, an inductor L0 is usually connected in parallel or in series with the dynamic branch ( Figure 1 Only a parallel connection is shown), so that the inductor L0 and the static capacitor C0 also work in a resonant state at the current operating frequency.

[0042] The inventors found that during the operation of the ultrasonic knife, the load R may change in real time because the target tissue being cut may be different. For example, when cutting some hard tissues, the load impedance will increase, so that the resonant frequency of the transducer in the resonant state is not fixed. Moreover, the size of the static capacitance C0 of different ultrasonic transducers is also different, which also affects the resonant frequency. Since the ultrasonic transducer is a lossy component, after a period of use, its static capacitance C0 will change, and it has a large discrete type. For example, the longer the service life, the static capacitance C0 will increase, resulting in the resonant frequency of the ultrasonic transducer changing dynamically during the process of cutting the target tissue.

[0043] To this end, an embodiment of the present disclosure provides a control method for an ultrasonic transducer, wherein the ultrasonic transducer is connected to a load, and the control method includes: obtaining a target current flowing through the load so that the ultrasonic transducer is in a resonant state; applying a driving signal to the ultrasonic transducer to generate a load current flowing through the load; and adjusting the driving signal so that the load current is equal to the target current, thereby putting the ultrasonic transducer in a resonant state.

[0044] In the control method of the ultrasonic transducer of the above embodiment of the present disclosure, the load current flowing through the load is made equal to the target current by adjusting the driving signal, so that the ultrasonic transducer is always in a resonant state.

[0045] In the disclosed embodiment, the current flowing through the dynamic branch of the load resistor determines the amplitude of the ultrasonic scalpel head. In order to achieve precise tissue cutting and good hemostasis, the amplitude needs to be controlled. In order to control the amplitude, it is necessary to control the current flowing through the dynamic branch in real time. Through the control method disclosed in the present invention, during the operation of the ultrasonic scalpel, the current flowing through the dynamic branch can be controlled in real time to be equal to the target current, so that the ultrasonic transducer is always in a resonant state, with the lowest impedance and the highest electromechanical conversion efficiency.

[0046] The present disclosure is described below by specific embodiments. In order to keep the following description of the embodiments of the present disclosure clear and concise, detailed descriptions of known functions and known components may be omitted. When any component of the embodiments of the present disclosure appears in more than one figure, the component may be represented by the same reference numeral in each figure.

[0047] Figure 2 1 is a block diagram of the connection of the components of the ultrasonic scalpel of the embodiment of the present disclosure. The embodiment of the present disclosure provides a surgical device, such as a surgical device. The surgical device is, for example, an ultrasonic scalpel.

[0048] like Figure 2 As shown, the ultrasonic scalpel of the embodiment of the present disclosure includes a host 1, an ultrasonic transducer 2 and an ultrasonic scalpel head 3. For example, the host 1 is connected to the ultrasonic transducer 2, and the ultrasonic transducer 2 is connected to the ultrasonic scalpel head 3. The host 1, for example, includes a control device 10, which provides a driving signal to the ultrasonic transducer 2. Under the excitation of the driving signal, the ultrasonic transducer 2 mechanically vibrates and transmits the mechanical vibration to the ultrasonic scalpel head 3. The ultrasonic scalpel head 3 achieves the purpose of cutting the target tissue or stopping bleeding through high-frequency vibration.

[0049] For example, in one example, the ultrasonic blade head 3 includes a rod-shaped component, which includes a proximal end and a distal end along its extension direction. The ultrasonic transducer 2 includes a housing having a handheld portion that is convenient for hand-holding, and the housing is connected to the proximal end of the rod-shaped component. An end actuator is provided at the distal end of the rod-shaped component, and the end actuator can be switched between an open or closed state to perform the action of cutting the target tissue. The specific structure of the ultrasonic blade head 3 and its connection method with the ultrasonic transducer 2 can refer to the existing design and will not be described in detail here.

[0050] Figure 3 Detailed description of the invention The equivalent circuit of the surgical device with ultrasonic transducer according to the embodiment of the present invention. Figure 4 The present invention is a flowchart of a method for controlling an ultrasonic transducer according to an embodiment of the present invention.

[0051] like Figure 3 As shown, in the surgical device of the embodiment of the present disclosure, the equivalent circuit of the ultrasonic transducer 2 is shown by the dotted line, including a dynamic inductor L1, a dynamic capacitor C1, a dynamic resistor R1 and a load resistor R connected in series, and also including a static capacitor C0, which is connected in parallel with a dynamic branch composed of the dynamic inductor L1, the dynamic capacitor C1, the dynamic resistor R1 and the load resistor R. In the ultrasonic scalpel of the embodiment of the present disclosure, there is no need to set Figure 1 The matching inductor L0 shown simplifies the design of the matching circuit.

[0052] For example, the driving signal includes a driving current I and a driving voltage U. Figure 3In the equivalent circuit of FIG. 1 , the driving current I is divided into two branch currents I1 and I2, wherein the branch current I1 is the load current flowing through the load resistor R, and the branch current I2 is the current flowing through the static capacitor C0. During the ultrasonic scalpel cutting of the target tissue, the load resistor R changes due to the different hardness of the target tissue. The inventors found that in order to ensure a good cutting or hemostatic effect, it is necessary to ensure that the amplitude of the ultrasonic scalpel head 3 is within a predetermined range, and the amplitude of the ultrasonic scalpel head 3 is determined by the current I1 flowing through the load resistor R.

[0053] For this reason, Figure 3 and Figure 4 As shown, the control method of the ultrasonic transducer provided in the embodiment of the present disclosure includes:

[0054] S100: Obtaining a target current I0 flowing through a load that causes the ultrasonic transducer to be in a resonant state;

[0055] S200: applying a driving signal to the ultrasonic transducer to generate a load current I1 flowing through a load R;

[0056] S300: Adjust the driving signal so that the load current I1 is equal to the target current I0, so that the ultrasonic transducer is in a resonant state.

[0057] As mentioned above, due to the large discreteness of the static capacitance C0 in different ultrasonic transducers. At the same time, due to the limitation of the inductor winding process, there is also a large discreteness, and the resonant frequency of each ultrasonic transducer is different. At the same time, when cutting the target tissue, the change of the load impedance will also cause the fluctuation of the resonant frequency. In the above control method, by adjusting the driving signal so that the load current I1 flowing through the load is equal to the target current I0, the ultrasonic transducer 2 is always in a resonant state during the process of cutting the target tissue.

[0058] For example, the target current I0 is the current that makes the ultrasonic transducer 2 in a resonant state, which is detected when the ultrasonic transducer 2 is manufactured by the manufacturer. In one example, the target current I0 has a value range of 125 mA to 400 mA.

[0059] In the disclosed embodiment, "A equals B" includes the case where A is within the preset range of B. For example, the load current I1 equals the target current I0 includes the case where the load current I1 is within the preset range of the target current I. For example, when the load current I1 floats within the preset range (e.g., ±10%) of the target current I0, it falls into the category of "load current I1 equals target current I0". That is, the load current I1 can be greater than or equal to the target current I0 multiplied by 90% and less than or equal to the target current I0 multiplied by 110%. Furthermore, the load current I1 can be greater than or equal to the target current I0 multiplied by 95% and less than or equal to the target current I0 multiplied by 105%, thereby further improving the control accuracy of the load current I1.

[0060] Similarly, the "driving frequency f equals the target frequency f0" mentioned below can be understood as: when the driving frequency f fluctuates within a preset range (e.g., ±10%) of the target frequency f0, it belongs to the category of "driving frequency f equals the target frequency f0". The "phase angle θ equals the target phase angle θ0" mentioned below can be understood as: when the phase angle θ fluctuates within a preset range (e.g., ±10%) of the target phase angle θ0, it belongs to the category of "phase angle θ equals the target phase angle θ0".

[0061] Usually, there is a phase difference between the driving current I and the driving voltage U, and the phase difference is also called the phase angle θ. In actual work, the driving signal is, for example, a sine wave signal, and the sine wave signal can be converted into a phase square wave signal of voltage and current, and further, the phase square wave signal can be converted into a phase difference square wave signal. Thus, the phase difference can be obtained.

[0062] Since the sine wave signal can reflect the frequency of the signal, the driving signal also includes a driving frequency f. The driving frequency f is related to the phase angle θ. When the ultrasonic transducer 2 is at the resonant frequency, the driving frequency f is equal to the target frequency f0, that is, the resonant frequency. At this time, the corresponding phase angle θ is called the target phase angle θ0.

[0063] Figure 5 This is a flow chart of the step of adjusting the driving signal in the control method of the embodiment of the present disclosure. Figure 6 This is a flow chart of the step of adjusting the driving frequency in the control method of the embodiment of the present disclosure.

[0064] like Figure 5 As shown, when adjusting the driving signal in step 300, the control method includes:

[0065] S310: Acquire a driving frequency f applied to the ultrasonic transducer; and

[0066] S320: The phase angle θ is adjusted by adjusting the driving frequency f, so that the load current I1 is equal to the target current I0.

[0067] Furthermore, if Figure 6 As shown, for example, when adjusting the driving frequency in step 200, the control method includes:

[0068] S321: Determine a target phase angle θ0 and a target frequency f0 corresponding to the target phase angle θ0;

[0069] S322: Adjust the driving frequency f so that the adjusted driving frequency f is equal to the target frequency f0, and the adjusted phase angle θ is equal to the target phase angle θ0.

[0070] The inventors found that during the operation of the ultrasonic transducer 2, the driving frequency f determines the phase angle θ, and the phase angle θ further determines the driving current I Figure 3 The distribution of the load current I1 in the two branches is the proportional relationship between the load current I1 and the current I2 flowing through the static capacitor C0. Therefore, by controlling the driving frequency f to adjust the phase angle θ, the proportional relationship between the load current I1 and the current I2 can be adjusted.

[0071] Figure 7 FIG. 1 is a schematic diagram showing the relationship between the driving current and the dynamic branch current in an embodiment of the present disclosure. Figure 3 and Figure 7 As shown, the drive current I, the load current I1 and the current I2 flowing through the static capacitor C0 satisfy the following trigonometric function relationship:

[0072] sinθ=I2 / I, cosθ=I1 / I.

[0073] When the phase angle θ is adjusted to θ0, the proportional relationship between I2 and I1 can be determined. At this time, by further adjusting the magnitude of the drive current I, the magnitude of the load current I1 can be adjusted so that the load current I1 is equal to the target current I0.

[0074] Figure 8 FIG. 1 is a flow chart of the step of adjusting the driving signal in the control method of another embodiment of the present disclosure. Figure 8 As shown, when adjusting the driving signal in step 300', the control method includes:

[0075] S330: Acquire a driving current I applied to the ultrasonic transducer; and

[0076] S340: Adjust the load current I1 by adjusting the driving current I, so that the load current I1 is equal to the target current I0.

[0077] In the embodiment of the present disclosure, step S322 of adjusting the driving frequency f and step S340 of adjusting the driving current I can be executed simultaneously, or one can be executed before the other, for example, the driving frequency f is adjusted first, and then the driving current I is adjusted. The embodiment of the present disclosure is not limited to this.

[0078] In the embodiment of the present disclosure, there are multiple ways to obtain the target phase angle θ0 and the target driving frequency f0. An example of an acquisition method is provided below. It can be understood that as long as the target phase angle θ0 and the target driving frequency f0 can be obtained during the cutting of the target tissue, they are all included in the scope of the embodiment of the present disclosure.

[0079] Fig. 9 FIG. 1 is a flow chart of the step of determining the target phase angle in the control method of the embodiment of the present disclosure. Fig. 9 As shown, when determining the target phase angle θ0, the control method includes:

[0080] S3211: Obtaining a driving voltage U applied to the ultrasonic transducer and a capacitive reactance Xc of the ultrasonic transducer;

[0081] S3212: Determine the current I2 flowing through the static capacitor C0 according to the capacitive reactance Xc and the driving voltage U;

[0082] S3213: Determine the target phase angle θ0 according to the current I2 flowing through the static capacitor and the target current I0.

[0083] For example, in step S3211, the capacitive reactance Xc is calculated according to the following formula (1):

[0084]

[0085] Wherein, w is the angular frequency, C is the capacitance value of the electrostatic capacitor C0, and j is the sign of the imaginary number in the complex number. For example, w = 2πf, and f is the frequency.

[0086] For example, in step S3212, based on the calculated capacitive reactance Xc and the acquired driving voltage U, the current I2 flowing through the static capacitor C0 is calculated according to the following formula (2):

[0087]

[0088] For example, in step S3213, refer to Figure 7 The trigonometric function relationship shown in FIG. 1 is used to calculate the target phase angle θ0 based on the calculated current I2 and the target current I0 according to the following formula (3):

[0089]

[0090] At this point, the target phase angle θ0 is obtained.

[0091] Fig.10 FIG. 1 is a flow chart of the step of determining the target frequency in the control method of the embodiment of the present disclosure. Fig.10 As shown, when determining the target frequency f0, the control method includes:

[0092] S3214: Perform frequency scanning within a preset frequency range;

[0093] S3215: During the frequency scanning process, the frequency that puts the ultrasonic transducer in a resonant state is obtained as the target frequency f0.

[0094] In the embodiment of the present disclosure, when the ultrasonic transducer is in a resonant state, that is, when the driving frequency f is equal to the resonant frequency f0, the impedance of the ultrasonic transducer is minimum, which not only helps the ultrasonic transducer to achieve maximum working efficiency, but also prolongs the service life of the ultrasonic transducer.

[0095] For example, during the frequency scanning process, the impedance of the ultrasonic transducer is obtained, and the frequency corresponding to the impedance minimum point is used as the target frequency f0. In one example, the value range of the minimum impedance is greater than or equal to 200 ohms.

[0096] In the disclosed embodiment, the preset frequency range is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; the target frequency f0 is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; the target phase angle θ0 is greater than or equal to 0° and less than or equal to 90°.

[0097] In the embodiment of the present disclosure, during the process of the ultrasonic blade 3 cutting the target tissue, the control method provided by the above-mentioned embodiment of the present disclosure is repeated, that is, the step of obtaining the target current I0 flowing through the load to put the ultrasonic transducer in a resonant state, the step of applying a driving signal to the ultrasonic transducer to generate a load current I1 flowing through the load R, and the step of adjusting the driving signal so that the load current I1 is equal to the target current I0 are repeated, so that the ultrasonic transducer always remains in a resonant state during operation until the target tissue is cut.

[0098] In the control method provided in the embodiment of the present disclosure, the load current can be monitored and adjusted in real time during the process of cutting the target tissue, so that the load current is equal to the target current I0, thereby keeping the ultrasonic transducer 2 in a resonant state. Figure 1 Compared with the equivalent circuit shown, since the size of the inductance L0 does not need to be considered in the control method of the present application, compared with the existing control method, it not only reduces the cost of circuit components, but also reduces the calculation error caused by the inductance L0, thereby improving the control accuracy of the load current.

[0099] Fig.11 FIG. 1 is a block diagram of a control device for an ultrasonic transducer according to an embodiment of the present disclosure. Fig.11 As shown, the embodiment of the present disclosure also provides a control device for an ultrasonic transducer, the control device is, for example, Figure 2 The control device 10 comprises:

[0100] an acquisition unit, configured to acquire a target current I0 flowing through the load R so that the ultrasonic transducer 2 is in a resonant state;

[0101] a driving unit configured to apply a driving signal to the ultrasonic transducer 2 to generate a load current I1 flowing through the load R; and

[0102] The regulating unit is configured to regulate the driving signal so that the load current I1 is equal to the target current I0, thereby placing the ultrasonic transducer 2 in a resonant state.

[0103] In the control device of the ultrasonic transducer of the above embodiment of the present disclosure, the driving signal is adjusted by the adjustment unit so that the load current flowing through the load is equal to the target current, so that the ultrasonic transducer is always in a resonant state.

[0104] For example, the acquisition unit is further configured to acquire the driving current I applied to the ultrasonic transducer 2 , and the adjustment unit is further configured to adjust the load current I1 by adjusting the driving current I, so that the load current I1 is equal to the target current I0 .

[0105] For example, the acquisition unit is further configured to acquire a driving frequency f applied to the ultrasonic transducer, and the adjustment unit is further configured to adjust the phase angle θ by adjusting the driving frequency f, so that the load current I1 is equal to the target current I0.

[0106] Further, for example, the adjustment unit is further configured to determine a target phase angle θ0 and a target frequency f0 corresponding to the target phase angle θ0, and adjust the driving frequency f so that the adjusted driving frequency f is equal to the target frequency f0, and the adjusted phase angle θ is equal to the target phase angle θ0. For the specific method of determining the target phase angle θ0 and the target frequency f0, please refer to the previous description, which will not be repeated here.

[0107] In the above control device of the embodiment of the present disclosure, the adjustment unit is used to adjust the driving current I and the driving frequency f, so that the load current can be quickly equal to the target current, so that the ultrasonic transducer is always in a resonant state. Figure 1 Compared with the existing control device, the parallel or series inductor L0 shown not only reduces the cost of circuit components, but also reduces the calculation error caused by the inductor L0, thereby improving the control accuracy of the load current.

[0108] The present disclosure also provides a surgical device, including: a processor and a memory, wherein the memory includes one or more computer program modules. The one or more computer program modules are stored in the memory and configured to be executed by the processor, and the one or more computer program modules include instructions for executing the control method provided in any of the previous embodiments.

[0109] The embodiments of the present disclosure also provide a storage medium for non-temporarily storing computer-readable instructions, which can implement the control method provided in any of the previous embodiments when the computer-readable instructions are executed by a computer.

[0110] In this article, there are several points to note.

[0111] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0112] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0113] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A control method for an ultrasonic transducer, wherein the ultrasonic transducer is connected to a load, the control method comprising: acquiring a target current flowing through the load so that the ultrasonic transducer is in a resonant state; applying a driving signal to the ultrasonic transducer to generate a load current flowing through the load; Adjusting the driving signal so that the load current is equal to the target current, thereby placing the ultrasonic transducer in the resonant state; The driving signal includes a driving current, a driving voltage and a driving frequency, and there is a phase angle between the driving current and the driving voltage. The adjusting the driving signal includes: acquiring the driving frequency applied to the ultrasonic transducer; and By adjusting the driving frequency to adjust the phase angle, the load current is made equal to the target current. Wherein, adjusting the phase angle by adjusting the driving frequency comprises: determining a target phase angle and a target frequency corresponding to the target phase angle; adjusting the driving frequency so that the driving frequency is equal to the target frequency, thereby making the phase angle equal to the target phase angle, The ultrasonic transducer is equivalent to a static capacitor, the static capacitor is connected in parallel with the load, and the determining of the target phase angle includes: Acquiring the driving voltage applied to the ultrasonic transducer and the capacitive reactance of the ultrasonic transducer; Determining a current flowing through the static capacitor according to the driving voltage and the capacitive reactance; The target phase angle is determined according to the current flowing through the static capacitor and the target current: Wherein, θ0 is the target phase angle, I2 is the current flowing through the static capacitor, and I0 is the target current.

2. The control method according to claim 1, wherein: The driving signal includes a driving current, and the adjusting the driving signal includes: acquiring the driving current applied to the ultrasonic transducer; and The load current is adjusted by adjusting the driving current so that the load current is equal to the target current.

3. The control method according to claim 1, wherein: The determining of a target frequency corresponding to the target phase angle comprises: Perform frequency scan within a preset frequency range; During the frequency scanning process, a frequency that causes the ultrasonic transducer to be in the resonant state is acquired as the target frequency.

4. The control method according to claim 3, wherein: When the ultrasonic transducer is at the frequency in the resonant state, the impedance of the ultrasonic transducer is minimum.

5. The control method according to claim 3, wherein: The preset frequency range is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; The target frequency is greater than or equal to 53.5 kHz and less than or equal to 57.5 kHz; The target phase angle is greater than or equal to 0° and less than or equal to 90°.

6. The control method according to claim 1, wherein: The driving signal includes a driving current, a driving voltage and a driving frequency, and there is a phase angle between the driving current and the driving voltage. The control method further includes: acquiring the driving current and the driving frequency applied to the ultrasonic transducer; The driving current is adjusted, and the driving frequency is adjusted to adjust the phase angle so that the load current is equal to the target current.

7. The control method according to claim 6, wherein: The load current, the drive current and the phase angle satisfy the following relationship: I1=I×cosθ, Wherein, I1 is the load current, I is the drive current, and θ is the phase angle.

8. The control method according to any one of claims 1 to 7, wherein: During the operation of the ultrasonic transducer, the steps of obtaining a target current flowing through the load that puts the ultrasonic transducer in a resonant state, applying a drive signal to the ultrasonic transducer to generate a load current flowing through the load, and adjusting the drive signal so that the load current is equal to the target current so that the ultrasonic transducer is in the resonant state are repeatedly performed.

9. A control device for an ultrasonic transducer, wherein the ultrasonic transducer is connected to a load, the control device comprising: an acquisition unit configured to acquire a target current flowing through the load so that the ultrasonic transducer is in a resonant state; a driving unit configured to apply a driving signal to the ultrasonic transducer to generate a load current flowing through the load; an adjusting unit configured to adjust the driving signal so that the load current is equal to the target current, thereby placing the ultrasonic transducer in the resonant state, The driving signal includes a driving current, a driving voltage and a driving frequency, and there is a phase angle between the driving current and the driving voltage. The acquisition unit is further configured to: acquire the driving frequency applied to the ultrasonic transducer; and the adjustment unit is further configured to: adjust the phase angle by adjusting the driving frequency, so that the load current is equal to the target current. Wherein, the adjustment unit is further configured to: determine a target phase angle and a target frequency corresponding to the target phase angle; adjust the driving frequency so that the driving frequency is equal to the target frequency, thereby making the phase angle equal to the target phase angle; Wherein, the ultrasonic transducer is equivalent to a static capacitor, and the static capacitor is connected in parallel with the load; the acquisition unit is further configured to: acquire the driving voltage applied to the ultrasonic transducer and the capacitive reactance of the ultrasonic transducer; the adjustment unit is further configured to: determine the current flowing through the static capacitor according to the driving voltage and the capacitive reactance; and determine the target phase angle according to the current flowing through the static capacitor and the target current: Wherein, θ0 is the target phase angle, I2 is the current flowing through the static capacitor, and I0 is the target current.

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