Transducer structure and electrosurgical instrument

Abstract

The application is suitable for the technical field of medical equipment, and provides a transducer structure and an electrosurgical instrument.The transducer structure comprises a metal front cover plate, a stack composed of a plurality of piezoelectric ceramic sheets and positive and negative electrode sheets, a conductive sheet, a plurality of insulating ceramic sheets and a metal rear cover plate which are extruded together by metal bolts. Insulating ceramic sheets are arranged between the stack and the front cover plate and between the stack and the rear cover plate. The conductive sheet is arranged between the insulating ceramic sheet and the rear cover plate and can be in electrical contact with the rear cover plate. The current conducted by the conductive sheet is conducted to the front cover plate through the rear cover plate and the bolt in sequence. The arrangement of the insulating ceramic sheets can ensure the insulation effect between the conductive sheet and the stack and can ensure that the high-frequency vibration generated by the stack can be smoothly transmitted to the front cover plate. In this way, the conductive sheet is integrated in the transducer structure, the structure is compact, and the installation space of the electrosurgical instrument can be effectively saved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a transducer structure and an electrosurgical instrument. Background Technology

[0002] The ultrasonic scalpel is a key surgical tool in minimally invasive surgery. The ultrasonic scalpel mainly consists of a transducer and a blade. The transducer is used to convert electrical energy into ultrasonic vibrations and transmit them to the blade, thereby cutting and coagulating blood vessels or tissues through the blade.

[0003] With the continuous development of technology, multifunctional surgical knives that combine ultrasonic cutting and electrocoagulation hemostasis have appeared on the market. Compared with traditional ultrasonic surgical knives, these multifunctional surgical knives have added at least one conductive structure. The conductive structure conducts the current from the external device to the blade, and then the blade conducts the current to the patient's blood vessels or tissues to perform electrocoagulation hemostasis.

[0004] However, due to the addition of the conductive structure, a structure for installing the conductive structure needs to be set inside the shell of the multi-functional scalpel, which makes the structure of the multi-functional scalpel more complex and requires a large installation space in the shell. Utility Model Content

[0005] The purpose of this application is to provide a transducer structure and an electrosurgical instrument, which aims to solve the technical problem that the structure of the existing multifunctional scalpel is complex and requires a large installation space.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] In a first aspect, this application provides a transducer structure, including a metal front cover plate pressed together by metal bolts, a stacked body composed of multiple piezoelectric ceramic sheets and positive and negative electrode sheets, a conductive sheet, multiple insulating ceramic sheets, and a metal rear cover plate, wherein:

[0008] The insulating ceramic sheet is provided between the stack and the front cover plate and between the stack and the rear cover plate respectively; the conductive sheet is capable of conducting current, and the conductive sheet is disposed between the insulating ceramic sheet and the rear cover plate and is capable of making electrical contact with the rear cover plate.

[0009] The beneficial effects of the transducer structure provided in this application are as follows: Compared with the prior art, the transducer structure provided in this application, by setting conductive plates and having the conductive plates in electrical contact with the rear cover plate, allows the current conducted by the conductive plates to be conducted sequentially through the rear cover plate and bolts to the front cover plate. After the positive and negative electrode plates of the stack are energized, multiple piezoelectric ceramic plates can generate high-frequency vibrations. Since insulating ceramic plates are respectively set between the stack and the front cover plate and between the stack and the rear cover plate, and the insulating ceramic plates have the characteristics of high rigidity and low damping, it can ensure the insulation effect between the conductive plates and the stack, and also ensure that the high-frequency vibrations generated by the stack can be smoothly transmitted to the tool holder, effectively reducing or even avoiding the influence of the conductive plates on the stack.

[0010] The transducer structure provided in this application can be applied to electrosurgical instruments (such as ultrasonic scalpels). By connecting the front cover plate to the scalpel handle of the electrosurgical instrument, the current conducted by the conductive sheet can be conducted to the scalpel handle through the front cover plate to achieve electrocoagulation hemostasis. Furthermore, the ultrasonic vibrations generated by the stack can also be transmitted to the scalpel handle through the front cover plate to achieve ultrasonic cutting. Thus, the electrosurgical instrument simultaneously possesses ultrasonic cutting and electrocoagulation hemostasis functions. Moreover, since the conductive sheet is integrated into the transducer structure, there is no need for an additional structure for mounting the conductive sheet, resulting in a compact structure and effectively saving installation space for the electrosurgical instrument.

[0011] Secondly, this application provides an electrosurgical instrument, including the transducer structure provided by any of the above technical solutions, and the electrosurgical instrument further includes an alloy scalpel that is threadedly connected to the amplitude rod at the front of the front cover plate.

[0012] The beneficial effects of the electrosurgical device provided in this application are as follows: Compared with the prior art, since the electrosurgical device provided in this application includes the transducer structure provided by the above-mentioned technical solution, it has at least all of the above-mentioned beneficial effects, which will not be repeated here. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a transducer structure provided in one embodiment of this application;

[0015] Figure 2 This is an exploded view of the transducer structure provided in one embodiment of this application;

[0016] Figure 3This is an exploded structural diagram of the stacked body in a transducer structure provided in one embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the assembly of the transducer structure and the scalpel in an electrosurgical instrument provided in one embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the overall structure of an electrosurgical device provided in one embodiment of this application;

[0019] Figure 6 This is a schematic diagram of the structure of an electrosurgical instrument provided in one embodiment of this application, in which part of the housing is hidden;

[0020] Figure 7 This is an exploded view of the components of an electrosurgical instrument provided in one embodiment of this application;

[0021] Figure 8 This is a partial structural diagram of an electrosurgical device provided in one embodiment of this application. Figure 1 ;

[0022] Figure 9 This is a schematic diagram of the structure of the first mounting base and the first conductive spring in an electrosurgical instrument provided in one embodiment of this application;

[0023] Figure 10 This is a partial structural diagram of an electrosurgical device provided in one embodiment of this application. Figure 2 ;

[0024] Figure 11 This is a schematic diagram of the structure of the second mounting base and the second conductive spring in an electrosurgical instrument provided in one embodiment of this application;

[0025] Figure 12 This is a schematic diagram of the connecting column in an electrosurgical instrument provided in one embodiment of this application.

[0026] The details of the reference numerals used in the above figures are as follows:

[0027] 10. Tool holder; 11. Annular protrusion; 12. Tool tip;

[0028] 21. Inner sleeve; 22. Outer sleeve; 23. Clamping arm; 24. Second mounting base; 25. Second conductive spring; 26. Insulating tube;

[0029] 30. Shell;

[0030] 40. Transducer structure; 41. Front cover plate; 411. Amplifier rod; 42. Flange; 43. Insulating ceramic sheet; 44. Stacked body; 441. Piezoelectric ceramic sheet; 442. Electrode sheet; 4421. Negative electrode sheet; 44211. Negative electrode pin; 4422. Positive electrode sheet; 44221. Positive electrode pin; 45. Conductive sheet; 451. Power connection pin; 46. Rear cover plate; 47. Bolt; 471. Head; 472. Tail; 48. Insulating sleeve; 49. Conductive gasket;

[0031] 50. Connecting post; 51. Conductive ring; 52. Through groove;

[0032] 61. First mounting base; 62. First conductive spring; 621. Elastic arm. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] To illustrate the technical solutions described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0038] First Embodiment

[0039] like Figure 1 and Figure 2 As shown, this embodiment provides a transducer structure 40, including a metal front cover plate 41 pressed together by metal bolts 47, a stacked body 44 composed of multiple piezoelectric ceramic sheets 441 and positive and negative electrode sheets, a conductive sheet 45, multiple insulating ceramic sheets 43, and a metal rear cover plate 46, wherein:

[0040] Insulating ceramic sheets 43 are provided between the stack body 44 and the front cover plate 41 and between the stack body 44 and the rear cover plate 46 respectively; conductive sheets 45 are capable of conducting current, and conductive sheets 45 are disposed between the insulating ceramic sheets 43 and the rear cover plate 46 and are capable of making electrical contact with the rear cover plate 46.

[0041] In this embodiment, the transducer structure 40 has a front-rear direction, with a front cover plate 41 and a rear cover plate 46 spaced apart along the front-rear direction, and the front cover plate 41 is located in front of the rear cover plate 46; the stack body 44 and the conductive sheet 45 are disposed between the front cover plate 41 and the rear cover plate 46, and the conductive sheet 45 is disposed behind the stack body 44; insulating ceramic sheets 43 are respectively disposed between the front cover plate 41 and the stack body 44, and between the stack body 44 and the conductive sheet 45. Bolt 47 includes a head 471 and a tail 472. The tail 472 is provided with external threads. The tail 472 of bolt 47 passes through the rear cover plate 46, the insulating ceramic sheet 43, the conductive sheet 45, the stack body 44 and the insulating ceramic sheet 43 and is threadedly connected to the front cover plate 41 so as to press the stack body 44, the conductive sheet 45, the multiple insulating ceramic sheets 43 and the metal rear cover plate 46 between the front cover plate 41 and the head 471 of bolt 47. That is, the metal front cover plate 41, the stack body 44, the conductive sheet 45, the multiple insulating ceramic sheets 43 and the metal rear cover plate 46 are pressed together by bolt 47.

[0042] The transducer structure 40 provided in this embodiment of the application, by setting a conductive sheet 45 and having the conductive sheet 45 in electrical contact with the rear cover plate 46, allows the current conducted by the conductive sheet 45 to be conducted sequentially through the rear cover plate 46 and the bolt 47 to the front cover plate 41. After the positive and negative electrode plates of the stack 44 are energized, the multiple piezoelectric ceramic plates 441 can generate high-frequency vibrations. Since insulating ceramic plates 43 are respectively set between the stack 44 and the front cover plate 41 and between the stack 44 and the rear cover plate 46, and the insulating ceramic plates 43 have the characteristics of high rigidity and low damping, the insulation effect between the conductive sheet 45 and the stack 44 can be ensured, and the high-frequency vibration generated by the stack 44 can be smoothly transmitted to the tool holder 10, effectively reducing or even avoiding the influence of the conductive sheet 45 on the stack 44. Furthermore, the insulating ceramic plates 43 can also effectively prevent electrical breakdown.

[0043] The transducer structure 40 provided in this embodiment can be applied to electrosurgical instruments (e.g., ultrasonic scalpels). By connecting the front cover plate 41 to the scalpel handle 10 of the electrosurgical instrument, the current conducted by the conductive sheet 45 can be conducted to the scalpel handle 10 through the front cover plate 41 to achieve electrocoagulation hemostasis. Furthermore, the ultrasonic vibration generated by the stack 44 can also be transmitted to the scalpel handle 10 through the front cover plate 41 to achieve ultrasonic cutting. Thus, the electrosurgical instrument simultaneously possesses ultrasonic cutting and electrocoagulation hemostasis functions. Moreover, since the conductive sheet 45 is integrated into the transducer structure 40, there is no need for an additional structure for mounting the conductive sheet 45, resulting in a compact structure and effectively saving installation space for the electrosurgical instrument.

[0044] In this embodiment, the stack 44, composed of multiple piezoelectric ceramic sheets 441 and positive and negative electrode sheets, specifically refers to the stack 44 including multiple piezoelectric ceramic sheets 441 and multiple electrode sheets 442. At least one electrode sheet 442 is a negative electrode sheet 4421, and at least one electrode sheet 442 is a positive electrode sheet 4422. The negative electrode sheet 4421 is used to connect to the negative terminal of an external power supply device, and the positive electrode sheet 4422 is used to connect to the positive terminal of the external power supply device. The negative electrode sheet 4421 and the positive electrode sheet 4422 are staggered along the front-to-back direction. In the stack 44, at least one piezoelectric ceramic sheet 441 is disposed between any two adjacent electrode sheets 442. When each electrode sheet 442 is energized, the piezoelectric ceramic sheet 441 can generate high-frequency vibration, thereby causing the stack 44 to generate high-frequency vibration, which is then transmitted to the front cover plate 41. Alternatively, among the multiple electrode plates 442, at least one electrode plate 442 may be a positive electrode plate 4421, and at least one electrode plate 442 may be a negative electrode plate 4422. Other details will not be elaborated.

[0045] In some optional embodiments, the number of ceramic sheets in the plurality of piezoelectric ceramic sheets 441 is 2, 4, 6, 8, 10, 12, or more (an even number). Preferably, the number of ceramic sheets is 2, 4, or 6. For example, as... Figure 2 and Figure 3As shown, there are three electrode plates 442, two of which are negative electrode plates 4421 and the other is a positive electrode plate 4422. The two negative electrode plates 4421 are spaced apart and connected to each other in the front-to-back direction, and the positive electrode plate 4422 is located between the two negative electrode plates 4421. In this example, there are two piezoelectric ceramic plates 441, one of which is located between the positive electrode plate 4422 and one of the negative electrode plates 4421, and the other is located between the positive electrode plate 4422 and the other negative electrode plate 4421. Alternatively, there are three electrode plates 221, two of which are positive electrode plates 4422 and the other is a negative electrode plate 4421. Other details are not elaborated here.

[0046] Optionally, the piezoelectric ceramic sheet 441 can be made of lead zirconate titanate (PbZrTiO3, PZT) ceramic or other suitable ceramic structures. In a specific example, the piezoelectric ceramic sheet 441 can be made of PZT-8 piezoelectric ceramic.

[0047] Optionally, the electrode sheet 442 can be made of a metal material, such as pure gold, pure silver, pure copper, or brass; or it can be a metal sheet plated with gold, silver, or copper, such as an aluminum sheet, without being limited to a single material. Optionally, the conductive sheet 45 can be made of the same material as the electrode sheet 442.

[0048] Alternatively, bolt 47 may be made of carbon steel, stainless steel, or other suitable metal materials. To improve the corrosion resistance of the metal bolt 47, a protective coating may be applied to the outer surface of bolt 47. For example, bolt 47 may be subjected to Dacromet zinc plating to form a zinc-chromium protective coating on the outer surface of bolt 47 to protect bolt 47.

[0049] Alternatively, the front cover 41 may be made of aluminum alloy, carbon steel, or other suitable metal materials. In one example, the front cover 41 may be made of heat-treated aluminum alloy, which helps to improve the performance stability of the front cover 41.

[0050] In some embodiments, such as Figure 2 As shown, a flange 42 is connected to the rear side of the front cover plate 41, and an insulating ceramic sheet 43 is specifically disposed between the flange 42 and the stack body 44 between the front cover plate 41 and the stack body 44. Optionally, the flange 42 can be made of the same material as the front cover plate 41.

[0051] Alternatively, the rear cover 46 may be made of carbon steel, stainless steel, or other suitable metal materials. For example, the rear cover 46 may be made of stainless steel (e.g., SUS304 stainless steel), which is beneficial for improving the service life of the transducer structure 40.

[0052] Optionally, the insulating ceramic sheet 43 can be made of alumina ceramic, zirconia ceramic, or other suitable ceramic materials. In one example, the insulating ceramic sheet 43 is made of alumina ceramic. Using alumina ceramic as the insulating ceramic sheet 43 improves its insulation and corrosion resistance, thus extending the service life of the transducer structure 40. In another example, the insulating ceramic sheet 43 is made of zirconia ceramic. Using zirconia ceramic as the insulating ceramic sheet 43 improves its impact and wear resistance, also extending the service life of the transducer structure 40 and preventing ordinary insulating sheets from being easily electrically broken down.

[0053] In one possible design, such as Figure 2 As shown, a conductive washer 49 is provided between the rear cover plate 46 and the bolt 47. The bolt 47 can pass through the rear cover plate 46 and the conductive washer 49 and can press the conductive washer 49 tightly onto the rear cover plate 46. In this embodiment, the conductive washer 49 is made of a conductive material (such as copper, aluminum, or titanium), so that the conductive washer 49 has a conductive function. The current conducted by the conductive sheet 45 is transmitted to the bolt 47 through the rear cover plate 46 and the conductive washer 49 in sequence. By providing the conductive washer 49, without affecting the current conduction between the rear cover plate 46 and the bolt 47, the bolt 47 can also obtain a more stable preload, improving the connection stability between the bolt 47 and the front cover plate 41.

[0054] In one possible design, the conductive sheet 45 is used to conduct current carrying signals of high-frequency monopolar electrocoagulation, high-frequency bipolar electrocoagulation, or nerve monitoring. In this embodiment, the conductive sheet 45 can be electrically connected to an external power supply device, and the current input by the external power supply device to the conductive sheet 45 with the corresponding signal can be controlled by adjusting the operating mode of the external power supply device.

[0055] For example, the external power supply device includes ultrasonic monopolar electrocoagulation mode, ultrasonic bipolar electrocoagulation mode, and nerve monitoring mode.

[0056] When the external power supply is in ultrasonic monopolar electrocoagulation mode, it inputs a current carrying a high-frequency monopolar electrocoagulation signal to the conductive sheet 45, enabling the electrosurgical instrument using the transducer structure 40 provided in this embodiment to have monopolar electrocoagulation function. Specifically, the front cover plate 41 is connected to the scalpel 10 in the electrosurgical instrument, and the current conducted by the conductive sheet 45 is conducted sequentially through the rear cover plate 46, the conductive pad 49, the bolt 47, and the front cover plate 41 to the scalpel 10. During the operation, an external electrode plate can be attached to the patient's body, with the conductive sheet 45 and the external electrode plate electrically connected to the positive and negative terminals of the external power supply, respectively. When the scalpel 10 comes into contact with the patient's body, a circuit can be formed, thereby realizing the monopolar electrocoagulation function.

[0057] When the external power supply is in ultrasonic bipolar electrocoagulation mode, it inputs a current carrying a high-frequency bipolar electrocoagulation signal to the conductive plate 45, enabling the electrosurgical instrument using the transducer structure 40 provided in this embodiment to have bipolar electrocoagulation function. Specifically, the electrosurgical instrument includes a scalpel 10 and a conductive mechanism, with the conductive mechanism and the conductive plate 45 in the transducer structure 40 respectively connected to the positive and negative terminals of the external power supply. During the operation, the scalpel 10 and the conductive mechanism are brought into contact with the patient's blood vessels or tissues to form a circuit. Current flows between the scalpel 10 and the conductive mechanism, generating heat, causing the blood vessels or tissues to be dehydrated and coagulated, thereby achieving bipolar electrocoagulation hemostasis.

[0058] When the external power supply is in nerve monitoring mode, it inputs a current carrying a nerve monitoring signal to the conductive plate 45, enabling the electrosurgical instrument using the transducer structure 40 provided in this embodiment to have nerve monitoring functionality. During surgery, external electrode plates can be attached to the patient's body, with the conductive plate 45 and the external electrode plates electrically connected to the positive and negative terminals of the external power supply, respectively. When the scalpel 10 contacts the patient's body, a circuit can be formed, allowing the external power supply to monitor the patient's nerves during surgery.

[0059] As can be seen from the above, when the external power supply device is in different modes, the electrosurgical instruments using the transducer structure 40 provided in this embodiment can have different functions (monopolar electrocoagulation function, bipolar electrocoagulation function, and nerve monitoring function, etc.). Thus, the working mode of the external power supply device can be adjusted according to actual needs during surgery, eliminating the need for frequent changes of different surgical instruments and helping to shorten surgical time. For example, when the external power supply device is in ultrasonic monopolar electrocoagulation mode or ultrasonic bipolar electrocoagulation mode, the electrosurgical instruments using the transducer structure 40 provided in this embodiment can immediately perform electrocoagulation hemostasis after ultrasonic cutting of blood vessels or tissues without changing the instruments, resulting in better hemostasis. Especially when the external power supply device is in ultrasonic bipolar electrocoagulation mode, the electrosurgical instruments can have a bipolar electrocoagulation function. The current carrying the high-frequency bipolar electrocoagulation signal generates a large amount of heat when passing through the patient's blood vessels or tissues, thus achieving a better coagulation effect on large blood vessels (blood vessels with a diameter of 5mm to 7mm) or larger tissues.

[0060] In some embodiments, the external power supply device connected to the conductive sheet 45 and the external electrode plate (or conductive mechanism) and the external power supply device connected to the positive and negative electrode sheets in the stack 44 can be the same external power supply device or different external power supply devices. It is worth noting that when the external power supply device connected to the conductive sheet 45 and the external electrode plate (or conductive mechanism) and the external power supply device connected to the positive and negative electrode sheets in the stack 44 can be the same external power supply device, the external power supply device includes two pairs of positive and negative terminals, the conductive sheet 45 and the external electrode plate (or conductive mechanism) are electrically connected to one pair of positive and negative terminals respectively, and the positive and negative electrode sheets in the stack 44 are electrically connected to the other pair of positive and negative terminals respectively.

[0061] In some embodiments, the positive electrode 4422 and negative electrode 4421 in the stack 44 are respectively electrically connected to the positive and negative terminals of an external power supply device capable of outputting current with a frequency of 50Hz to 55.5kHz. Preferably, the positive electrode 4422 and negative electrode 4421 in the stack 44 are respectively electrically connected to the positive and negative terminals of an external device capable of outputting current with a frequency of 50kHz. When this frequency of current is input to the stack 44, it is beneficial to increase the actual cutting length of the scalpel 10 in the electrosurgical instrument, thereby improving the cutting effect on large blood vessels or larger tissues.

[0062] In one example, the external power supply connected to the conductive sheet 45 and the conductive mechanism can be the same external power supply connected to the positive and negative electrode sheets in the stack 44. In practical applications, when the external power supply outputs high-frequency current to the negative electrode sheet 4421 and the positive electrode sheet 4422 in the stack 44, the electrosurgical instrument can perform ultrasonic cutting; when the external power supply outputs current with a high-frequency bipolar electrocoagulation signal to the conductive sheet 45 and the conductive mechanism, the electrosurgical instrument can perform bipolar electrocoagulation. In some optional embodiments, the operation of the external power supply outputting current to the positive and negative electrode sheets in the stack 44 and the operation of outputting current to the conductive sheet 45 and the conductive mechanism can be performed simultaneously or sequentially. In this way, the electrosurgical instrument can have multiple operating modes, such as performing ultrasonic cutting first and then bipolar electrocoagulation, or performing bipolar electrocoagulation first and then ultrasonic cutting, or performing bipolar electrocoagulation and ultrasonic cutting simultaneously.

[0063] In this embodiment, the rear cover plate 46, the insulating ceramic sheet 43, the conductive sheet 45, and the stack 44 are each provided with an inner hole, and the axis of the inner hole of the rear cover plate 46, the insulating ceramic sheet 43, the conductive sheet 45, and the stack 44 all coincide with the axis of the bolt 47, so that the bolt 47 can pass smoothly through each inner hole and be threadedly connected to the front cover plate 41.

[0064] In one possible design, such as Figure 2As shown, the transducer structure 40 also includes an insulating sleeve 48 disposed between the bolt 47 and the inner bore of the stack 44. The insulating sleeve 48 provides insulation between the bolt 47 and the stack 44 to prevent the current on the bolt 47 from affecting the stack 44. Optionally, the insulating sleeve 48 is made of plastic, rubber, or other suitable insulating material, for example, the insulating sleeve 48 is made of POM (Polyoxymethylene) plastic.

[0065] It should be noted that the stack 44 is provided with an inner hole for the bolt 47 to pass through. Specifically, each piezoelectric ceramic sheet 441 and each electrode sheet 442 has an inner hole extending through it in the front-to-back direction. Optionally, the inner wall of the inner hole of each piezoelectric ceramic sheet 441 and the area surrounding its own inner hole are coated with insulating varnish, and the inner wall of the inner hole of each electrode sheet 442 and the area surrounding its own inner hole are also coated with insulating varnish. This arrangement can effectively reduce the possibility of creepage and improve the insulation effect.

[0066] Second Embodiment

[0067] like Figure 4 As shown, this embodiment provides an electrosurgical instrument, including the transducer structure 40 provided in any of the above embodiments. The electrosurgical instrument also includes an alloy scalpel 10 threadedly connected to the amplitude transformer 411 at the front of the front cover plate 41. Since the electrosurgical instrument provided in this embodiment includes the transducer structure 40 provided in any of the above embodiments, it possesses at least all of the aforementioned beneficial effects, which will not be elaborated further here. The electrosurgical instrument provided in this application embodiment is suitable for minimally invasive laparoscopic procedures and other open surgical procedures, including but not limited to thyroid endoscopic surgery.

[0068] In one possible design, the outer side of the scalpel 10 is provided with a plurality of annular protrusions 11 integrally formed with the scalpel 10. In this embodiment, the front end of the scalpel 10 (the end of the scalpel 10 away from the transducer structure 40) is configured as the blade head 12. During surgery, specifically, the blade head 12 of the scalpel 10 comes into contact with the patient's blood vessels or tissues. By providing the annular protrusions 11, it is beneficial to transmit the vibration generated by the stack 44 to the blade head 12. Furthermore, since the annular protrusions 11 are integrally formed with the scalpel 10, the steps of installing the annular protrusions 11 are reduced, facilitating assembly. Optionally, the difference between the outer diameter of each annular protrusion 11 and the outer diameter of the scalpel 10 is 0.5 mm.

[0069] In some embodiments, multiple annular protrusions 11 are disposed on the ultrasonic vibration nodes of the cutter bar 10. It should be noted that when the vibration generated by the stack 44 is transmitted to the cutter bar 10, the vibration on the cutter bar 10 has antinodes (points of maximum amplitude) and nodes (amplitudes close to zero). The aforementioned ultrasonic vibration nodes specifically refer to the locations of the nodes. By providing multiple annular protrusions 11, the impedance at each annular protrusion 11 location is increased. Simultaneously, since the energy at the ultrasonic vibration nodes is low, it is beneficial to concentrate the ultrasonic vibration nodes of each vibration transmission at the locations of each annular protrusion 11, making the amplitude at each annular protrusion 11 close to zero during each vibration transmission. This means that the energy at each annular protrusion 11 is close to zero during each vibration transmission. According to the law of conservation of energy, the energy at the nodes decreases, which is beneficial to increasing the energy at the antinodes, thereby increasing the amplitude at the antinodes, and thus more effectively transmitting the vibration generated by the stack 44 to the cutter head 12.

[0070] In one possible design, the electrosurgical instrument also includes an insulating tube 26 sleeved on the scalpel handle 10, the insulating tube 26 covering multiple annular protrusions 11. The insulating tube 26 on the scalpel handle 10 facilitates the protection of the operator's personal safety. Furthermore, in this embodiment, the multiple annular protrusions 11 are positioned between the insulating tube 26 and the scalpel handle 10. The annular protrusions 11 reduce the contact area between the scalpel handle 10 and the insulating tube 26, which helps reduce friction between them, thereby facilitating the transmission of vibrations generated by the stack 44 to the scalpel head 12. Optionally, the insulating tube 26 can be made of materials such as plastic or rubber; for example, the insulating tube 26 is made of PTEE (polytetrafluoroethylene).

[0071] In one embodiment, such as Figure 5 As shown, the electrosurgical instrument also includes a housing 30, such as Figure 6 and Figure 7 As shown, the blade 10 is rotatably mounted inside the housing 30 around a preset axis L, and the transducer structure 40 is rotatably mounted inside the housing 30. The amplitude transformer 411 at the front end of the front cover plate 41 of the transducer structure 40 is threadedly connected to the rear end of the blade 10, allowing the blade 10 to drive the transducer structure 40 to rotate around the preset axis L. This configuration facilitates adjustment of the cutting direction of the blade 12 during surgery, improving the flexibility of the electrosurgical instruments.

[0072] In some embodiments, such as Figure 7 and Figure 8As shown, the electrosurgical instrument also includes a connecting post 50, a first mounting base 61, and first conductive springs 62. The connecting post 50 has three conductive rings 51, one of which is electrically connected to the conductive sheet 45 in the transducer structure 40, and the other two are electrically connected to the positive and negative electrode sheets in the stack 44, respectively. The connecting post 50 is mounted in the first mounting base 61 and can rotate around a preset axis L under the drive of the transducer structure 40. The first mounting base 61 has three first conductive springs 62, each corresponding to one of the three conductive rings 51. Each first conductive spring 62 contacts the outer circumferential surface of its corresponding conductive ring 51, ensuring a stable electrical connection between the conductive ring 51 and its corresponding first conductive spring 62 during rotation around the preset axis L. In this embodiment, each first conductive spring 62 is electrically connected to an external power supply device to achieve electrical connection between the conductive sheet 45 and each positive and negative electrode sheet and the external power supply device.

[0073] In a specific example, such as Figure 8 and Figure 9 As shown, the first conductive spring 62 includes two elastic arms 621, and each conductive ring 51 is clamped between the two elastic arms 621 of the corresponding first conductive spring 62. This arrangement allows the connecting post 50 to be detachably installed in the first mounting base 61. When it is necessary to replace a different model of the cutter bar 10, it is convenient to quickly remove the cutter bar 10, transducer structure 40, and connecting post 50 from the housing 30 and install a new cutter bar 10, transducer structure 40, and connecting post 50. In this embodiment, the length of the cutter bar 10 can be 14mm, 23mm, 36mm, or 45mm, etc.

[0074] In a specific example, such as Figures 1 to 3 and Figure 8 As shown, conductive sheet 45 is connected to a power-on pin 451, negative conductive sheet 45 is connected to a negative terminal pin 44211, and positive conductive sheet 45 is connected to a positive terminal pin 44221. Corresponding leads are soldered to the power-on pin 451, negative terminal pin 44211, and positive terminal pin 44221. One conductive ring 51 is electrically connected to the conductive sheet 45 via the lead soldered to the power-on pin 451, and the other two conductive rings 51 are electrically connected to the leads soldered to the positive terminal pin 44221 and the negative terminal pin 44211, respectively. Figure 8 and Figure 12As shown, three through slots 52 are provided on the outer circumferential surface of the connecting post 50. One through slot 52 is used to accommodate the power connection pin 451, another through slot 52 is used to accommodate the negative terminal pin 44211, and the remaining through slot 52 is used to accommodate the positive terminal pin 44221. This arrangement limits the relative positioning of the power connection pin 451, the negative terminal pin 44211, and the positive terminal pin 44221 with the connecting post 50, which helps to improve the electrical connection stability between the leads welded to the power connection pin 451, the negative terminal pin 44211, and the positive terminal pin 44221 and the corresponding conductive ring 51.

[0075] In some embodiments, such as Figure 7 As shown, the electrosurgical instrument also includes a conductive mechanism, and the conductive mechanism and conductive plate 45 are electrically connected to the positive and negative terminals of an external power supply device, respectively. Figure 7 and Figure 10 As shown, the conductive mechanism includes an inner sleeve 21, an outer sleeve 22, a clamping arm 23, a second mounting base 24, and a second conductive spring 25. The inner sleeve 21 is sleeved on the outside of the tool holder 10, and the outer sleeve 22 is sleeved on the outside of the inner sleeve 21. The clamping arm 23 is hinged to the front ends of the inner sleeve 21 and the outer sleeve 22, respectively. Figure 7 , Figure 8 and Figure 11 As shown, the second mounting base 24 is installed inside the housing 30. The rear end of the outer sleeve 22 is rotatably mounted in the second mounting base 24 around a preset axis L. A second conductive spring 25 is provided in the second mounting base 24. The second conductive spring 25 contacts the outer peripheral surface of the outer sleeve 22. The second conductive spring 25 and the conductive sheet 45 are electrically connected to the external power supply device, respectively. It should be noted that the conductive sheet 45 is electrically connected to the external power supply device, specifically, the conductive sheet 45 is electrically connected to the external power supply device through the corresponding conductive ring 51 and the first conductive spring 62 corresponding to the conductive ring 51. In this embodiment, the current from the external power supply device can be conducted to the clamping arm 23 in sequence through the second conductive spring 25 and the outer sleeve 22. During the operation, the clamping arm 23 and the blade 12 jointly clamp the patient's blood vessels or tissues to form a circuit. The current flows between the blade 12 and the clamping arm 23 and generates heat, causing the blood vessels or tissues to be dehydrated and coagulated, thereby achieving the bipolar electrocoagulation hemostasis function.

[0076] In the above embodiment, both the inner sleeve 21 and the outer sleeve 22 are positioned at the upper limit in the circumferential direction relative to the scalpel 10 around the preset axis L, so that the inner sleeve 21 and the outer sleeve 22 can rotate with the scalpel 10 around the preset axis L, and drive the clamping arm 23 to rotate with the scalpel 10, so as to adaptively adjust the clamping position of the clamping arm 23 and the scalpel head 12 during the operation, thereby improving the flexibility of the electrosurgical instrument.

[0077] Optionally, such as Figure 10As shown, an insulating tube 26 is provided between the inner sleeve 21 and the tool bar 10 to provide insulation between the inner sleeve 21 and the tool bar 10 and prevent short circuits; an insulating tube 26 is also provided on the outside of the outer sleeve 22 to protect the personal safety of the operator.

[0078] Optionally, such as Figure 8 and Figure 11 As shown, the structure of the second conductive spring 25 is the same as that of the first conductive spring 62. The second conductive spring 25 is clamped on the outer periphery of the outer sleeve 22, so that the outer sleeve 22 can be detachably installed in the second mounting base 24.

[0079] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transducer structure, characterized in that, It includes a metal front cover plate bolted together with metal bolts, a stack of multiple piezoelectric ceramic sheets and positive and negative electrode sheets, a conductive sheet, multiple insulating ceramic sheets, and a metal rear cover plate, wherein: The insulating ceramic sheet is provided between the stack and the front cover plate and between the stack and the rear cover plate respectively; the conductive sheet is capable of conducting current, and the conductive sheet is disposed between the insulating ceramic sheet and the rear cover plate and is capable of making electrical contact with the rear cover plate.

2. The transducer structure as described in claim 1, characterized in that, The number of ceramic sheets in the plurality of piezoelectric ceramic sheets is 2, 4, or 6.

3. The transducer structure as described in claim 1, characterized in that, The insulating ceramic sheet is made of alumina or zirconium oxide ceramic.

4. The transducer structure as described in claim 1, characterized in that, A conductive washer is provided between the rear cover plate and the bolt. The bolt can pass through the rear cover plate and the conductive washer and can press the conductive washer tightly against the rear cover plate.

5. The transducer structure as described in any one of claims 1-4, characterized in that, The conductive sheet is used to conduct current carrying signals of high-frequency monopolar electrocoagulation, high-frequency bipolar electrocoagulation, or nerve monitoring.

6. The transducer structure according to any one of claims 1-4, characterized in that, The transducer structure further includes an insulating sleeve disposed between the bolt and the inner hole of the stack.

7. An electrosurgical instrument, characterized in that, Including the transducer structure as described in any one of claims 1-6, the electrosurgical instrument further includes an alloy scalpel that is threadedly connected to the amplitude rod at the front of the front cover plate.

8. The electrosurgical instrument as described in claim 7, characterized in that, The outer side of the tool holder is provided with multiple annular protrusions integrally formed with the tool holder.

9. The electrosurgical instrument as described in claim 8, characterized in that, Multiple annular protrusions are disposed on the ultrasonic vibration nodes of the tool holder.

10. The electrosurgical instrument as described in claim 8 or 9, characterized in that, The electrosurgical instrument also includes an insulating tube fitted onto the scalpel shaft, the insulating tube being capable of covering the plurality of the annular protrusions.

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