An ultrasonic blade drive system

Abstract

The application provides an ultrasonic knife driving system, comprising a first power supply, a power amplifier, a main transformer, a main processor, a DA digital-analog converter, a voltage signal AD sampling circuit, a current signal AD sampling circuit, an auxiliary circuit, a second power supply and a transducer assembly, wherein the first power supply is an AC-DC power supply connected to a power frequency voltage; the power amplifier is arranged on a high voltage side of the system, and the leakage current of the ultrasonic knife driving system is lower than a safety requirement value by configuring the positions of components on the high voltage side and the low voltage side and making the parasitic capacitance of the first power supply or the high voltage and low voltage isolation components lower than a preset value. The application improves the safety of the ultrasonic knife driving system and meets higher level CF requirements.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an ultrasonic scalpel driving system. Background Technology

[0002] like Figure 1 and Figure 2 The diagram shows a common ultrasonic drive system structure. The first power supply 1 (ACDC) converts the mains voltage (typically 50 / 60Hz, 100–240Vrms) into a DC voltage Vdc (typically 12V–48V) to provide power to the entire ultrasonic drive system. The power amplifier 2 amplifies the reference signal provided by the DA converter circuit 6, amplifying both voltage and power, and outputs it to the main transformer 3. The main transformer 3 further amplifies the voltage (typically a maximum output voltage of 150Vrms) to excite the transducer assembly 18 (transducer and scalpel), causing the ultrasonic scalpel to generate high-frequency oscillations (typically around 55.5kHz, with an amplitude of tens of micrometers) for surgical procedures. Because the ultrasonic scalpel generates heat during tissue cutting, causing changes in the resonant frequency, it is necessary to sample the ultrasonic drive voltage and current to track the resonant frequency in real time. The voltage signal AD sampling circuit 7 and the current signal AD sampling circuit 8 in the diagram implement the sampling function and transmit the data to the main processor 4. Since the ultrasonic drive voltage and current are on the high-voltage side, a voltage signal isolation transformer 10 and a current signal isolation transformer 11 are needed to achieve information transmission between the high and low voltages. The main processor 4 converts the received voltage and current signals and then uses the DA digital-to-analog converter circuit 6 to generate a new reference signal for the power amplifier 2. All circuits on the low-voltage side require a low-voltage DC voltage VL for power. The low-voltage side DC-DC board-level power supply 12 in the diagram converts the DC voltage Vdc generated by the first power supply 1 into VL to power the various components on the low-voltage side. For user interaction, the ultrasonic drive system is generally equipped with auxiliary circuits 5 (other circuits shown in the diagram, such as an LCD screen, USB, etc.). In addition, there are usually some circuits on the high-voltage side that require DC voltage VH to power them. The isolated DC-DC module 9 in the figure converts the DC voltage Vdc on the low-voltage side into the circuit power supply voltage VH on the high-voltage side, thus powering the various components on the high-voltage side.

[0003] Please continue to refer to this. Figure 2If the main transformer 3 is designed reasonably (e.g., parasitic capacitance 1 does not exceed 110pF), the leakage current generated by the power frequency voltage (e.g., 50 / 60Hz, 240Vrms) will be small enough (e.g., CF level, not exceeding 10uA). However, because the main transformer 3 must meet the conditions of high power transmission, reasonable voltage ratio, and low leakage inductance, the first parasitic capacitance C1 it generates is difficult to be small enough (e.g., 10pF). Therefore, the high driving voltage generated by the ultrasonic scalpel drive system (e.g., frequency 55.5kHz, 150Vrms) will generate a large leakage current (e.g., greater than 10uA) flowing out of the ultrasonic scalpel driver and into the ground through the body of medical staff or patients. However, this is unacceptable for high-safety surgeries such as cardiovascular surgery. Figure 2 The diagram illustrates the leakage path of the ultrasonic scalpel drive signal in a common ultrasonic scalpel drive system. In the diagram, the first parasitic capacitance C1 of the main transformer 3 causes leakage current at the ultrasonic scalpel excitation frequency to flow through the human body. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, this invention proposes an ultrasonic scalpel driving system that can meet higher safety requirements.

[0005] To solve the above-mentioned technical problems, embodiments of the present invention provide an ultrasonic scalpel driving system, including: a first power supply, a power amplifier, a main transformer, a main processor, a DA digital-to-analog converter, a voltage signal AD sampling circuit, a current signal AD sampling circuit, an auxiliary circuit, a second power supply, and a transducer assembly, wherein the first power supply is an AC-DC power supply connected to the power frequency voltage.

[0006] The power amplifier is located on the high-voltage side of the system. By configuring the positions of the components on the high and low voltage sides and making the parasitic capacitance of the first power supply or high-voltage and low-voltage isolation components lower than a preset value, the leakage current of the ultrasonic scalpel driving system is lower than the safety requirement value.

[0007] Preferably, the main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are located on the high-voltage side. The main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are powered by a high-voltage side DC-DC board-level power supply. The second power supply is an AC-DC board-level power supply. The second power supply and auxiliary circuit are located on the low-voltage side and are isolated from the high-voltage side by an isolation communication module.

[0008] The sum of the parallel connection of the second parasitic capacitor of the first power supply, the ninth parasitic capacitor of the second power supply, and the eighth parasitic capacitor of the isolated communication module is set to be less than 110pF.

[0009] Preferably, the main transformer is also located on the high-voltage side, while the main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, second power supply, and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high-low voltage isolation. A signal isolation transformer is provided between the power amplifier and the DA digital-to-analog converter. A voltage signal isolation transformer is provided between the main transformer and the voltage signal AD sampling circuit. A current signal isolation transformer is provided between the main transformer and the current signal AD sampling circuit.

[0010] The sum of the parallel connection of the third parasitic capacitance of the isolated DC-DC module, the seventh parasitic capacitance of the signal isolation transformer, the fourth parasitic capacitance of the voltage signal isolation transformer, and the fifth parasitic capacitance of the current signal isolation transformer is set to be less than 110pF.

[0011] Preferably, the second power supply is a DC-DC board-level power supply, with its input terminal connected to the output terminal of the first power supply, and its output terminal connected to the main processor, the DA digital-to-analog converter, the voltage signal AD sampling circuit, the current signal AD sampling circuit, the second power supply, and the auxiliary circuit.

[0012] Preferably, the main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are also located on the high-voltage side, while the second power supply and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high-low voltage isolation, and an isolation communication module is provided between the main processor and the auxiliary circuit for high-low voltage isolation. The sum of the parallel connection of the third parasitic capacitance of the isolation DC-DC module and the eighth parasitic capacitance of the isolation communication module is set to be less than 110pF.

[0013] Preferably, the high-voltage side is provided with a high-voltage side plate-level power supply, which is connected to the output terminal of the isolated DC-DC module. The output terminal of the high-voltage side plate-level power supply is connected to the main processor, the DA digital-to-analog converter, the voltage signal AD sampling circuit, and the current signal AD sampling circuit; the second power supply is a DC-DC board-level power supply, and its output terminal is connected to the auxiliary circuit.

[0014] Preferably, the main transformer, main processor, DA converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are also located on the high-voltage side, while the second power supply and auxiliary circuit are located on the low-voltage side. A battery pack is provided between the power amplifier and the first power supply, and the first power supply is used to charge the battery pack. The ultrasonic scalpel driving system disconnects from the first power supply when outputting ultrasonic signals to drive the ultrasonic scalpel. An isolation communication module is provided between the main processor and the auxiliary circuit for high and low voltage isolation, and the eighth parasitic capacitance of the isolation communication module is set to be less than 110pF.

[0015] Preferably, the high-voltage side is provided with a high-voltage side plate-level power supply, which is connected to the output terminal of the battery pack. The output terminal of the high-voltage side plate-level power supply is connected to the main processor, the DA digital-to-analog converter, the voltage signal AD sampling circuit, and the current signal AD sampling circuit. The second power supply is an AC-DC plate-level power supply, whose input terminal is connected to the power frequency voltage and whose output terminal is connected to the auxiliary circuit.

[0016] Preferably, the power amplifier, main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, auxiliary circuit, second power supply, and transducer assembly are all located on the high-voltage side, and high and low voltage isolation is achieved through the first power supply. A battery pack is provided between the power amplifier and the first power supply, and the first power supply is used to charge the battery pack. When the ultrasonic scalpel driving system outputs an ultrasonic signal to drive the ultrasonic scalpel, it disconnects from the first power supply.

[0017] Preferably, the main transformer is also located on the high-voltage side, while the main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, second power supply, and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high- and medium-voltage isolation. A medium-voltage region is provided between the isolation DC-DC module and the first power supply. A signal isolation transformer is provided between the power amplifier and the DA digital-to-analog converter. A voltage signal isolation transformer is provided between the main transformer and the voltage signal AD sampling circuit. A current signal isolation transformer is provided between the main transformer and the current signal AD sampling circuit. The second power supply is an ACDC board-level power supply with one end connected to the power frequency voltage.

[0018] The sum of the parallel connection of the third parasitic capacitance of the isolated DC-DC module, the seventh parasitic capacitance of the signal isolation transformer, the fourth parasitic capacitance of the voltage signal isolation transformer, and the fifth parasitic capacitance of the current signal isolation transformer is set to be less than 110pF.

[0019] Compared with the prior art, the embodiments of the present invention place the power amplifier on the high-voltage side of the system and set it in a non-isolated manner with the ultrasonic drive signal output terminal. By configuring the positions of the components on the high and low voltage sides and making the parasitic capacitance of the first power supply or high-voltage and low-voltage isolation components lower than a preset value (such as 110pF), the leakage current of the ultrasonic scalpel drive system is lower than the safety requirement value (such as 10μA). Attached Figure Description

[0020] The present invention will now be described in detail with reference to the accompanying drawings. The above and other aspects of the present invention will become clearer and more readily understood through the detailed description following the accompanying drawings. (Appendix)

[0021] In the picture:

[0022] Figure 1 Here is a structural diagram of a commonly used ultrasonic scalpel driving system;

[0023] Figure 2 for Figure 1 The diagram shows the leakage current path of the ultrasonic scalpel driving system.

[0024] Figure 3 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the leakage current path of the ultrasonic scalpel driving system in Embodiment 1 of the present invention;

[0026] Figure 5 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment 2 of the present invention;

[0027] Figure 6 This is a schematic diagram of the leakage path of the ultrasonic scalpel driving system in Embodiment 2 of the present invention;

[0028] Figure 7 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment 3 of the present invention;

[0029] Figure 8 This is a schematic diagram of the leakage path of the ultrasonic scalpel driving system in Embodiment 3 of the present invention;

[0030] Figure 9 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment 4 of the present invention;

[0031] Figure 10 This is a schematic diagram of the leakage path of the ultrasonic scalpel driving system in Embodiment 4 of the present invention;

[0032] Figure 11 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment 5 of the present invention;

[0033] Figure 12This is a schematic diagram of the leakage current path of the ultrasonic scalpel driving system in Embodiment 5 of the present invention;

[0034] Figure 13 This is a structural diagram of the ultrasonic scalpel driving system according to Embodiment Six of the present invention;

[0035] Figure 14 This is a schematic diagram of the leakage current path of the ultrasonic scalpel driving system in Embodiment 6 of the present invention. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] The specific embodiments / examples described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation methods or scope of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein, all of which are within the protection scope of the present invention.

[0038] The following descriptions of the embodiments are made with reference to the accompanying drawings, illustrating specific embodiments in which the invention can be implemented. Directional terms used in this invention, such as up, down, front, back, left, right, inside, outside, side, etc., are merely directional references to the accompanying drawings. Therefore, the directional terms used are for illustrative and understanding purposes only, and not for limiting the invention.

[0039] Example 1

[0040] Please refer to Figure 3 As shown, Figure 3 An ultrasonic scalpel driving system provided in Embodiment 1 of the present invention includes: a first power supply 1, a power amplifier 2, a main transformer 3, a main processor 4, a digital-to-analog converter 6, a voltage signal AD sampling circuit 7, a current signal AD sampling circuit 8, an auxiliary circuit 5, a second power supply 15, and a transducer assembly 18. The first power supply 1 is an AC-DC power supply connected to the power frequency voltage. The power amplifier 2 is located on the high-voltage side of the system. The auxiliary circuit 5 includes a USB circuit, a display circuit, and other circuits.

[0041] Furthermore, the main transformer 3, main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, and current signal AD sampling circuit 8 are located on the high-voltage side. The main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, and current signal AD sampling circuit 8 are powered by a high-voltage side DC-DC board-level power supply 14. The second power supply 15 is an AC-DC board-level power supply. The second power supply 15 and auxiliary circuit 5 are located on the low-voltage side and are isolated from the high voltage by an isolation communication module 13. The sum of the second parasitic capacitor C2 of the first power supply 1, the ninth parasitic capacitor C9 of the second power supply, and the eighth parasitic capacitor C8 of the isolation communication module (C2, C9, and C8 in parallel have equal values) is set to be less than 110pF.

[0042] In this embodiment, the high-voltage side refers to the non-electrically isolated area between the high-voltage side and the ultrasonic drive signal output terminal, and the opposite side is the low-voltage side.

[0043] Based on existing technologies ( Figure 2 As shown, the leakage current generated by the ultrasonic scalpel drive signal is mainly due to the power amplifier not being placed on the ultrasonic scalpel drive signal output side (hereinafter referred to as the high-voltage side). Therefore, the ultrasonic scalpel drive signal outputs leakage current to the human body outside the driver through the large parasitic capacitance of the main transformer. Therefore, in this embodiment, the power amplifier is placed on the high-voltage side so that the leakage current generated by the voltage of the ultrasonic scalpel excitation frequency will not flow outward.

[0044] Meanwhile, in order to meet the requirement that the power frequency leakage current to the high voltage side is less than 10μA, this embodiment designs the total capacitance of the parasitic capacitance C2 of the first power supply 1 and the parasitic capacitance C8 of the isolation communication (C2 and C8 are of equal value in parallel) to be less than 110pF, thereby meeting the CF requirement.

[0045] As shown in Figure 4, this is a schematic diagram of the leakage path of the ultrasonic scalpel driving system in this embodiment. It can be seen that the leakage of path 1 (the voltage generated by the ultrasonic scalpel excitation frequency) returns directly to the power amplifier and will not leak out to the human body. The parasitic capacitance 2 of the ACCDC board power supply and the parasitic capacitance 9 of the isolation communication are small enough to prevent the leakage of path 2 (power frequency voltage) from passing through the human body.

[0046] Example 2

[0047] like Figure 5The diagram shows a schematic of the ultrasonic scalpel driving system according to Embodiment 2 of the present invention. Unlike Embodiment 1, the power amplifier 2 and the main transformer 3 are located on the high-voltage side, while the main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, current signal AD sampling circuit 8, second power supply 12, and auxiliary circuit 5 are located on the low-voltage side. An isolation DC-DC module 16 is provided between the power amplifier 2 and the first power supply 1 for high-low voltage isolation. A signal isolation transformer 9 is provided between the power amplifier 2 and the DA digital-to-analog converter 6. A voltage signal isolation transformer 10 is provided between the main transformer 3 and the voltage signal AD sampling circuit 7. A current signal isolation transformer 11 is provided between the main transformer 3 and the current signal AD sampling circuit 8. The sum of the third parasitic capacitance C3 of the isolation DC-DC module 16, the seventh parasitic capacitance C7 of the signal isolation transformer 9, the fourth parasitic capacitance C4 of the voltage signal isolation transformer, and the fifth parasitic capacitance C5 of the current signal isolation transformer (C3, C7, C4, and C5 in parallel, with equivalent values) is set to less than 110 pF.

[0048] In this embodiment, the second power supply 12 is a DC-DC board-level power supply, whose input terminal is connected to the output terminal Vdc of the first power supply 1, and whose output terminal VL is connected to the main processor 4, the DA digital-to-analog converter 6, the voltage signal AD sampling circuit 7, the current signal AD sampling circuit 8, and the auxiliary circuit 5.

[0049] In Embodiment 1, the parasitic capacitance of the first power supply includes parasitic and EMC suppression capacitance. If the value of parasitic capacitance C2 cannot be lower than 110pF in order to meet EMC requirements or other requirements, the structure of Embodiment 2 can be used. In Embodiment 2, the power amplifier is not directly powered by the first power supply, but is powered by the isolated DC-DC module 16, which can isolate power frequency leakage. Therefore, the parasitic capacitance of the isolated DC-DC must be as small as possible, for example, lower than 110pF.

[0050] like Figure 6 The diagram shows the leakage path of the ultrasonic scalpel driving system in this embodiment. Adding an isolation DC-DC converter can effectively block the power frequency leakage current from flowing through the human body through path 2 or reduce the power frequency leakage current to below the required level. However, path 1 still generates voltage at the ultrasonic scalpel excitation frequency, which in turn generates current flowing through the human body. Therefore, the seventh parasitic capacitor C7 of the signal isolation transformer 9, the fourth parasitic capacitor C4 of the voltage signal isolation transformer, and the fifth parasitic capacitor C5 of the current signal isolation transformer also need to be strictly designed. For example, the sum of the seventh parasitic capacitor C7, the fourth parasitic capacitor C4, and the fifth parasitic capacitor C5 (C7, C4, and C5 in parallel, etc.) should be set to be less than 110pF.

[0051] Example 3

[0052] like Figure 7 The diagram shows the structure of the ultrasonic scalpel driving system according to Embodiment 3 of the present invention. In addition to the power amplifier 2, the main transformer 3, main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, and current signal AD sampling circuit 8 are also located on the high-voltage side. The second power supply 15 and the auxiliary circuit 5 are located on the low-voltage side. An isolation DC-DC module 16 is provided between the power amplifier 2 and the first power supply 1 for high-low voltage isolation. An isolation communication module 13 is provided between the main processor 4 and the auxiliary circuit 5 for high-low voltage isolation. The sum of the third parasitic capacitance C3 of the isolation DC-DC module 16 and the eighth parasitic capacitance C8 of the isolation communication module (C3 and C8 are in parallel and have equal value) is set to be less than 110pF.

[0053] Furthermore, a high-voltage side plate-level power supply 14 is provided on the high-voltage side. The high-voltage side plate-level power supply 14 is connected to the output terminal of the isolated DC-DC module 16. The output terminal of the high-voltage side plate-level power supply 15 is connected to the main processor 4, the DA digital-to-analog converter 6, the voltage signal AD sampling circuit 7, and the current signal AD sampling circuit 8. The second power supply 15 is a DC-DC plate-level power supply. Its input terminal is connected to the output terminal of the first power supply 1, and its output terminal is connected to the auxiliary circuit 5.

[0054] Based on the fact that in Example 2, there is still a situation where ultrasonic scalpel excitation frequency leakage current flows through the human body, this example, building upon Example 2, further places the main processor 4 on the high-voltage side. Therefore, all ultrasonic frequency leakage current will not leak out of the driver and flow into the human body, meeting the CF requirements. Please refer to... Figure 8 As shown, since the ultrasonic scalpel drive frequency-related circuits are all configured in the same area on the high-voltage side, it can be seen that the leakage current (voltage generated by the ultrasonic scalpel excitation frequency) in path 1 will not flow through the human body. However, in reality, due to the resistance of the transducer wires or parasitic inductance, a small portion may still leak out. Therefore, attention should be paid to the design value of the eighth parasitic capacitor C8 in the isolation communication module 13 to avoid the generation of leakage current paths.

[0055] Example 4

[0056] like Figure 9The diagram shows the structure of the ultrasonic scalpel driving system according to Embodiment 4 of the present invention. In addition to the power amplifier 2 being located on the high-voltage side, the main transformer 3, main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, and current signal AD sampling circuit 8 are also located on the high-voltage side. The second power supply 15 and the auxiliary circuit 5 are located on the low-voltage side. A battery pack 17 is provided between the power amplifier 2 and the first power supply 1. The first power supply 1 is used to charge the battery pack 17. When the ultrasonic scalpel driving system outputs an ultrasonic signal to drive the ultrasonic scalpel, it disconnects from the first power supply 1. An isolation communication module 13 is provided between the main processor 4 and the auxiliary circuit 5 for high-low voltage isolation. The eighth parasitic capacitance C8 of the isolation communication module is set to be less than 110pF.

[0057] In this embodiment, a high-voltage side plate-level power supply 14 is provided on the high-voltage side. The high-voltage side plate-level power supply 14 is connected to the output terminal of the battery pack 17. The output terminal of the high-voltage side plate-level power supply 14 is connected to the main processor 4, the DA digital-to-analog converter 6, the voltage signal AD sampling circuit 7, and the current signal AD sampling circuit 8. The second power supply 15 is an AC-CDC plate-level power supply. Its input terminal is connected to the power frequency voltage, and its output terminal is connected to the auxiliary circuit 5.

[0058] like Figure 10 As shown, as long as the first power supply 1 is not connected to ground when the ultrasonic scalpel is driven, and the eighth parasitic capacitor C8 of the isolation communication module is small enough (less than 110pF), the power frequency leakage current generated from the second power supply 15 ACCDC board-level power supply will be lower than the regulatory requirements. Furthermore, since the ultrasonic scalpel drive frequency-related circuits are all configured in the same area on the high-voltage side, the ultrasonic frequency leakage current will not flow out of the driver and into the human body, thus meeting the CF level requirement.

[0059] Example 5

[0060] like Figure 11 The diagram shows the structure of the ultrasonic scalpel driving system according to Embodiment 5 of the present invention. The power amplifier 2, main transformer 3, main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, current signal AD sampling circuit 8, auxiliary circuit 5, second power supply 14, and transducer assembly 18 are all located on the high-voltage side and isolated from the high voltage by the first power supply 1. A battery pack 17 is provided between the power amplifier 2 and the first power supply 1. The first power supply 1 is used to charge the battery pack 17. When the ultrasonic scalpel driving system outputs an ultrasonic signal to drive the ultrasonic scalpel, it disconnects from the first power supply 1.

[0061] like Figure 12As shown, when the ultrasonic scalpel driving system outputs ultrasonic signals to drive the ultrasonic scalpel, it is not allowed to connect to the power frequency voltage, i.e., the first power supply connection is disconnected. Therefore, the ultrasonic scalpel driving system will not be connected to the ground during surgery, and there will be no power frequency leakage or ultrasonic frequency leakage. As for the leakage of the ultrasonic scalpel excitation frequency, it is the same as in Example 4, and there will be no leakage to the human body.

[0062] Example 6

[0063] like Figure 13 The diagram shows the structure of the ultrasonic scalpel driving system according to Embodiment 6 of the present invention. The main transformer 3 is also located on the high-voltage side, while the main processor 4, DA digital-to-analog converter 6, voltage signal AD sampling circuit 7, current signal AD sampling circuit 8, second power supply 15, and auxiliary circuit 5 are located on the low-voltage side. An isolation DC-DC module 16 is provided between the power amplifier 2 and the first power supply 1 for high- and medium-voltage isolation. A medium-voltage region is provided between the isolation DC-DC module 16 and the first power supply 1. A signal isolation transformer 9 is provided between the power amplifier 2 and the DA digital-to-analog converter 6. A voltage signal isolation transformer 10 is provided between the main transformer 3 and the voltage signal AD sampling circuit 7, and a current signal isolation transformer 11 is provided between the main transformer 3 and the current signal AD sampling circuit 8. The second power supply 15 is an ACDC board-level power supply with one end connected to the power frequency voltage. The sum of the third parasitic capacitance C3 of the isolation DCDC module 16, the seventh parasitic capacitance C7 of the signal isolation transformer, the fourth parasitic capacitance C4 of the voltage signal isolation transformer, and the fifth parasitic capacitance C5 of the current signal isolation transformer (C3, C7, C4, and C5 in parallel with equivalent value) is set to be less than 110pF.

[0064] Please refer to Figure 14 This is a schematic diagram of the leakage path of the ultrasonic scalpel driving system in this embodiment. Based on the situation in Embodiment 2, this embodiment can still meet the CF requirements.

[0065] This embodiment, without changing the system structure of the above embodiment, simply splits the power supply (ACDC, DCDC, or battery) in the solution into several series-parallel combinations of similar power supplies, or further separates the high and low voltage areas to reduce leakage current and meet CF requirements. For example: Figure 13 As shown, the low-voltage region in Embodiment 2 is divided into medium-voltage and low-voltage regions, and the ACDC is split into an ACDC and an ACDC board-level power supply to power the medium-voltage side and the low-voltage side respectively. Based on this, under the concept of the present invention, there are still many variable structural forms that lead to different embodiments, which will not be listed one by one in the present invention.

[0066] It should be noted that the various embodiments described above with reference to the accompanying drawings are merely illustrative of the present invention and not intended to limit its scope. Those skilled in the art should understand that any modifications or equivalent substitutions made to the present invention without departing from its spirit and scope should be included within the scope of the present invention. Furthermore, unless the context otherwise requires, words appearing in the singular include those in the plural, and vice versa. Additionally, unless specifically stated otherwise, all or part of any embodiment may be used in conjunction with all or part of any other embodiment.

Claims

1. An ultrasonic scalpel driving system, comprising: The system includes a first power supply, a power amplifier, a main transformer, a main processor, a DA digital-to-analog converter, a voltage signal AD sampling circuit, a current signal AD sampling circuit, an auxiliary circuit, a second power supply, and a transducer assembly. The first power supply is an AC-DC power supply connected to the power frequency voltage. The feature is that the power amplifier is located on the high-voltage side of the system. By configuring the positions of the components on the high and low voltage sides and making the parasitic capacitance of the first power supply or high-voltage and low-voltage isolation components lower than a preset value, the leakage current of the ultrasonic scalpel driving system is lower than the safety requirement value. The so-called high-voltage side refers to the non-electrically isolated area between the high-voltage side and the ultrasonic drive signal output terminal, while the area that is electrically isolated from the high-voltage side is the low-voltage side. The main transformer, main processor, DA digital-to-analog converter, voltage signal AD acquisition circuit, and current signal AD sampling circuit are located on the high-voltage side. The main processor, DA digital-to-analog converter, voltage signal AD acquisition circuit, and current signal AD sampling circuit are powered by a high-voltage side DC-DC board-level power supply. The second power supply is an AC-DC board-level power supply. The second power supply and auxiliary circuit are located on the low-voltage side and are isolated from the high-voltage side by an isolation communication module. The sum of the parallel connection of the second parasitic capacitor of the first power supply, the ninth parasitic capacitor of the second power supply, and the eighth parasitic capacitor of the isolated communication module is set to be less than 110pF.

2. The ultrasonic scalpel driving system according to claim 1, characterized in that, The main transformer is also located on the high-voltage side, while the main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, second power supply, and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high-low voltage isolation. A signal isolation transformer is provided between the power amplifier and the DA digital-to-analog converter. A voltage signal isolation transformer is provided between the main transformer and the voltage signal AD sampling circuit. A current signal isolation transformer is provided between the main transformer and the current signal AD sampling circuit. The sum of the parallel connection of the third parasitic capacitance of the isolated DC-DC module, the seventh parasitic capacitance of the signal isolation transformer, the fourth parasitic capacitance of the voltage signal isolation transformer, and the fifth parasitic capacitance of the current signal isolation transformer is set to be less than 110pF.

3. The ultrasonic scalpel driving system according to claim 2, characterized in that, The second power supply is a DC-DC board-level power supply, with its input terminal connected to the output terminal of the first power supply, and its output terminal connected to the main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, and auxiliary circuit.

4. The ultrasonic scalpel driving system according to claim 1, characterized in that, The main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are also located on the high-voltage side, while the second power supply and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high-low voltage isolation, and an isolation communication module is provided between the main processor and the auxiliary circuit for high-low voltage isolation. The sum of the third parasitic capacitance of the isolation DC-DC module and the eighth parasitic capacitance of the isolation communication module in parallel is set to be less than 110pF.

5. The ultrasonic scalpel driving system according to claim 4, characterized in that, The high-voltage side is equipped with a high-voltage side-plate level power supply, which is connected to the output terminal of the isolated DC-DC module. The output terminal of the high-voltage side-plate level power supply is connected to the main processor, the DA digital-to-analog converter, the voltage signal AD sampling circuit, and the current signal AD sampling circuit. The second power supply is a DC-DC board-level power supply, and its output terminal is connected to the auxiliary circuit.

6. The ultrasonic scalpel driving system according to claim 1, characterized in that, The main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, and current signal AD sampling circuit are also located on the high-voltage side. The second power supply and auxiliary circuit are located on the low-voltage side. A battery pack is provided between the power amplifier and the first power supply. The first power supply is used to charge the battery pack. When the ultrasonic scalpel driving system outputs an ultrasonic signal to drive the ultrasonic scalpel, it disconnects from the first power supply. An isolation communication module is provided between the main processor and the auxiliary circuit for high and low voltage isolation. The eighth parasitic capacitance of the isolation communication module is set to be less than 110pF.

7. The ultrasonic scalpel driving system according to claim 6, characterized in that, The high-voltage side is equipped with a high-voltage side plate-level power supply, which is connected to the output terminal of the battery pack. The output terminal of the high-voltage side plate-level power supply is connected to the main processor, the DA digital-to-analog converter, the voltage signal AD sampling circuit, and the current signal AD sampling circuit. The second power supply is an AC-DC board-level power supply, whose input terminal is connected to the power frequency voltage and whose output terminal is connected to the auxiliary circuit.

8. The ultrasonic scalpel driving system according to claim 1, characterized in that, The power amplifier, main transformer, main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, auxiliary circuit, second power supply, and transducer assembly are all located on the high-voltage side and isolated from the high voltage by the first power supply. A battery pack is provided between the power amplifier and the first power supply, and the first power supply is used to charge the battery pack. When the ultrasonic scalpel drive system outputs an ultrasonic signal to drive the ultrasonic scalpel, it disconnects from the first power supply.

9. The ultrasonic scalpel driving system according to claim 1, characterized in that, The main transformer is also located on the high-voltage side, while the main processor, DA digital-to-analog converter, voltage signal AD sampling circuit, current signal AD sampling circuit, second power supply, and auxiliary circuit are located on the low-voltage side. An isolation DC-DC module is provided between the power amplifier and the first power supply for high-low voltage isolation. A medium-voltage region is provided between the isolation DC-DC module and the first power supply. A signal isolation transformer is provided between the power amplifier and the DA digital-to-analog converter. A voltage signal isolation transformer is provided between the main transformer and the voltage signal AD sampling circuit. A current signal isolation transformer is provided between the main transformer and the current signal AD sampling circuit. The second power supply is an ACDC board-level power supply with one end connected to the power frequency voltage. The sum of the parallel connection of the third parasitic capacitance of the isolation DC-DC module, the seventh parasitic capacitance of the signal isolation transformer, the fourth parasitic capacitance of the voltage signal isolation transformer, and the fifth parasitic capacitance of the current signal isolation transformer is set to be less than 110pF.

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