Torque wrench and ultrasonic surgical instrument

Abstract

The present application relates to a kind of torque wrench and ultrasonic surgical instrument.The torque wrench includes first force transmission component and second force transmission component and elastic member;The elastic force direction of elastic member is along first direction, and the two ends of elastic member along first direction are connected to second force transmission component and first force transmission component respectively, wherein, first direction is the direction when first force transmission component and second force transmission component relatively rotate;Second force transmission component is provided with limiting structure, and first force transmission component is provided with cooperating structure, and the elastic force of elastic member can make limiting structure and cooperating structure along first direction abut, and the elastic deformation of elastic member can make limiting structure and cooperating structure separate along first direction.By the torque wrench described above, shaft assembly and ultrasonic transducer can be assembled according to pre-set assembly torque, so as to limit the tightening force between shaft assembly and ultrasonic transducer within suitable range.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to torque wrenches and ultrasonic surgical instruments. Background Technology

[0002] Ultrasonic surgical instruments generally include an end effector, a shaft assembly, and an ultrasonic transducer connected in sequence. Their working principle is mainly to convert ultrasonic electrical energy into mechanical energy through the ultrasonic transducer. The mechanical energy is transmitted to the end effector through the waveguide rod in the shaft assembly, thereby enabling the end effector to transmit energy to the local tissue of the human body to achieve the purpose of surgical treatment.

[0003] In ultrasonic surgical instruments, the shaft assembly and the ultrasonic transducer are typically connected by a threaded connection. However, currently, it is difficult to control the tightening force at the threaded connection between the shaft assembly and the ultrasonic transducer within an appropriate range during the assembly of ultrasonic surgical instruments. Insufficient tightening force at the threaded connection between the shaft assembly and the ultrasonic transducer will lead to a reduction in the vibration energy transmitted through the shaft assembly to the end effector, affecting the surgical treatment effect. Excessive tightening force at the threaded connection between the shaft assembly and the ultrasonic transducer may cause damage to the threaded connection. Summary of the Invention

[0004] Therefore, it is necessary to address the problem that it is difficult to control the tightening force at the threaded connection between the shaft assembly and the ultrasonic transducer within a suitable range when assembling ultrasonic surgical instruments. This torque wrench can control the tightening force at the threaded connection between the shaft assembly and the ultrasonic transducer within a suitable range when assembling ultrasonic surgical instruments.

[0005] One embodiment of this application provides a torque wrench, which includes a first force transmission component, a second force transmission component, and an elastic element; the elastic force of the elastic element is directed along a first direction, and the two ends of the elastic element along the first direction are respectively connected to the second force transmission component and the first force transmission component, wherein the first direction is the direction in which the first force transmission component and the second force transmission component rotate relative to each other;

[0006] The second force transmission component is provided with a limiting structure, and the first force transmission component is provided with a mating structure. The elastic force of the elastic element can cause the limiting structure and the mating structure to abut against each other along the first direction. The elastic deformation of the elastic element can cause the limiting structure and the mating structure to separate along the first direction.

[0007] The aforementioned torque wrench is used to thread the shaft assembly of an ultrasonic surgical instrument to an ultrasonic transducer, fixing the shaft assembly to one of the first and second force transmission components. In the initial stage of the threaded connection, torque is applied to the other of the first and second force transmission components, causing the elastic element to rotate both components, thereby gradually tightening the shaft assembly and the ultrasonic transducer. When the tightening force reaches the assembly torque (equal to the elastic force of the elastic element when the limiting structure and the mating structure abut in the first direction), the shaft assembly is tightened, and the shaft assembly stops rotating, thus preventing the first or second force transmission component fixed to the shaft assembly from rotating. Continuing to rotate the other component causes relative rotation between the first and second force transmission components. The relative rotation between the second and first force transmission components indicates that the tightening force between the shaft assembly and the ultrasonic transducer has reached the required assembly torque. At this point, stopping the rotation of the other of the first and second force transmission components completes the assembly of the shaft assembly and the ultrasonic transducer. Therefore, the torque wrench described above allows the shaft assembly and the ultrasonic transducer to be assembled according to a pre-set assembly torque, thus limiting the tightening force between the shaft assembly and the ultrasonic transducer to a suitable range.

[0008] In one embodiment, the first force transmission component includes a first force transmission body and a first connecting portion connected to the first force transmission body;

[0009] The second force transmission component includes a second force transmission body, and an arc-shaped groove extending along a first direction is formed inside the second force transmission body; the arc-shaped groove has a first groove wall facing the first direction, the first connecting part and the elastic member are located in the arc-shaped groove, one end of the elastic member along the first direction abuts against the first groove wall, and the other end abuts against the first connecting part.

[0010] In one embodiment, the number of the arc-shaped grooves is one; or,

[0011] The number of arc-shaped grooves is multiple, and the multiple arc-shaped grooves are spaced apart along the first direction. Each arc-shaped groove is provided with a corresponding first connecting part and the elastic element.

[0012] In one embodiment, the arcuate groove has a second groove wall facing the axial direction of the arcuate groove, the limiting structure is disposed on the second groove wall, and the mating structure is disposed on the first connecting portion.

[0013] In one embodiment, the first force transmission body is provided with a first indicating structure, and the second force transmission body is provided with a second indicating structure. The cooperation between the second indicating structure and the first indicating structure is used to indicate the relative position of the first force transmission component and the second force transmission component along the first direction.

[0014] In one embodiment, the first indicating structure is a first protrusion that protrudes outward from the first force-transmitting body in the radial direction, and the second indicating structure is a second protrusion that protrudes outward from the second force-transmitting body in the radial direction; when the limiting structure and the mating structure abut against each other in the first direction, the first protrusion and the second protrusion abut against each other in the first direction.

[0015] In one embodiment, the first indicating structure is a first protrusion that protrudes outward from the first force-transmitting body in the radial direction, and the second indicating structure is a second protrusion that protrudes outward from the second force-transmitting body in the radial direction; when the limiting structure and the mating structure abut against each other in the first direction, the two ends of the first protrusion in the first direction are aligned with the two ends of the second protrusion in the first direction.

[0016] In one embodiment, the first force transmission component further includes a mounting plate connected to the first force transmission body, the first indicating structure being disposed on the mounting plate, and the mounting plate being located on one side of the second force transmission body along the axial direction.

[0017] In one embodiment, the second force transmission component is provided with a limiting groove, and the limiting structure is the groove wall at one end of the limiting groove along the first direction. The elastic deformation of the elastic element enables the mating structure to slide relative to each other in the limiting groove along the first direction.

[0018] One embodiment of this application provides an ultrasonic surgical instrument, including a shaft assembly, an ultrasonic transducer, and a torque wrench as described in any one of the claims. The shaft assembly passes through the first force transmission assembly and the second force transmission assembly, and is fixedly connected to the first force transmission assembly or the second force transmission assembly. The shaft assembly is threadedly connected to the ultrasonic transducer.

[0019] When the shaft assembly of the aforementioned ultrasonic surgical instrument is threadedly connected to the ultrasonic transducer, it is fixedly connected to one of the first and second force transmission components. In the initial stage of the threaded connection, a torque is applied to the other of the first and second force transmission components, causing the elastic element to drive both components to rotate together, thereby gradually tightening the shaft assembly and the ultrasonic transducer. When the tightening force reaches the assembly torque (equal to the elastic force of the elastic element when the limiting structure and the mating structure abut in the first direction), the shaft assembly and the ultrasonic transducer are tightened, and the shaft assembly stops rotating. Consequently, the component fixedly connected to the shaft assembly in the first and second force transmission components also stops rotating. Continuing to rotate the other component causes relative rotation between the first and second force transmission components. The relative rotation between the second and first force transmission components indicates that the tightening force between the shaft assembly and the ultrasonic transducer has reached the required assembly torque. At this point, stopping the rotation of the other of the first and second force transmission components completes the assembly of the shaft assembly and the ultrasonic transducer. Therefore, the torque wrench described above allows the shaft assembly and the ultrasonic transducer to be assembled according to a pre-set assembly torque, thus limiting the tightening force between the shaft assembly and the ultrasonic transducer to a suitable range. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an ultrasonic surgical instrument according to one embodiment;

[0021] Figure 2 for Figure 1 Exploded view of the torque wrench in the diagram;

[0022] Figure 3 for Figure 1 An exploded view of the partial structure of the torque wrench in the image;

[0023] Figure 4 for Figure 1 A schematic diagram showing the contact between the limiting structure and the mating structure of the torque wrench.

[0024] Figure 5 for Figure 1 A schematic diagram of the torque wrench when the limiting structure and the mating structure are separated.

[0025] Explanation of icon numbers:

[0026] 10 Ultrasonic surgical instruments; 11 Shaft assembly; 12 Ultrasonic transducer; 13 Handle;

[0027] Torque wrench 100;

[0028] First force transmission component 110; mating structure 111; first force transmission body 112; first connecting part 113; first indicating structure 114; mounting plate 115; first positioning structure 116; second positioning structure 117; insertion hole 103; shaft cylinder 118;

[0029] Second force transmission component 120; arc groove 101; limiting structure 121; second force transmission body 122; first groove wall 123; inner retaining ring 124; second groove wall 125; limiting slide 102; second indicating structure 126;

[0030] Elastic element 130. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device 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 invention.

[0033] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features directly abut each other, or that the first and second features indirectly abut each other through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Please combine Figures 1 to 5 This application provides a torque wrench 100 in one embodiment. The torque wrench 100 is used to thread a shaft assembly 11 of an ultrasonic surgical instrument 10 to an ultrasonic transducer 12. The torque wrench 100 includes a first force transmission assembly 110, a second force transmission assembly 120, and an elastic element 130. The first force transmission assembly 110 and the second force transmission assembly 120 are rotatable relative to each other. A first direction is the direction of rotation when the first force transmission assembly 110 and the second force transmission assembly 120 rotate relative to each other. The elastic force of the elastic element 130 is directed along the first direction, with one end of the elastic element 130 connected to the first force transmission assembly 110 and the other end connected to the second force transmission assembly 120 along the first direction.

[0038] refer to Figures 3 to 5 The second force transmission component 120 is provided with a limiting structure 121, and the first force transmission component 110 is provided with a mating structure 111. For example... Figure 4As shown, when the elastic force of the elastic member 130 causes the limiting structure 121 and the mating structure 111 to abut in the first direction, that is, when the first force transmission component 110 and the second force transmission component 120 abut in the first direction, the second force transmission component 120 and the first force transmission component 110 can rotate synchronously in the first direction. Figure 5 As shown, if the first force transmission component 110 remains in a non-rotating state along the first direction, and the torque applied to the second force transmission component 120 along the first direction exceeds the elastic force of the elastic member 130, then the elastic member 130 can be elastically deformed along the first direction, thereby causing the first force transmission component 110 and the second force transmission component 120 to rotate relative to each other along the first direction, and the limiting structure 121 and the mating structure 111 to separate along the first direction.

[0039] refer to Figure 1 When the torque wrench 100 is used to thread the shaft assembly 11 of the ultrasonic surgical instrument 10 to the ultrasonic transducer 12, the shaft assembly 11 is passed through the first force transmission assembly 110 and the second force transmission assembly 120, and the first force transmission assembly 110 is fixedly connected to the shaft assembly 11. The position of the ultrasonic transducer 12 can be fixed (for example, by holding the ultrasonic transducer 12 with one hand), and the shaft assembly 11 is rotated by the first force transmission assembly 110 and the second force transmission assembly 120 to achieve the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12.

[0040] Specifically, when designing the structure of the shaft assembly 11 and the ultrasonic transducer 12, the assembly torque (i.e. the tightening force when tightening) of the shaft assembly 11 and the ultrasonic transducer 12 is preset to be equal to the elastic force of the elastic element 130 when the limiting structure 121 and the mating structure 111 abut in the first direction.

[0041] In the initial stage of the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12, the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 is less than the assembly torque of the two. Therefore, the torque required to rotate the shaft assembly 11 is less than the assembly torque of the shaft assembly 11 and the ultrasonic transducer 12 (i.e., less than the elastic force of the elastic member 130 when the limiting structure 121 and the mating structure 111 abut in the first direction). Since the elastic force of the elastic member 130 causes the limiting structure 121 and the mating structure 111 to abut in the first direction, applying a torque in the first direction to the second force transmission assembly 120 to rotate the second force transmission assembly 120 can drive the first force transmission assembly 110 to rotate together with the second force transmission assembly 120 through the elastic member 130, thereby driving the shaft assembly 11 and the ultrasonic transducer 12 to gradually tighten.

[0042] As the shaft assembly 11 and the ultrasonic transducer 12 are gradually tightened, the torque required to rotate the shaft assembly 11 also gradually increases. When the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches their assembly torque (i.e., equal to the elastic force of the elastic element 130 when the limiting structure 121 and the mating structure 111 abut in the first direction), the shaft assembly 11 and the ultrasonic transducer 12 are tightened, and the first force transmission assembly 110 and the shaft assembly 11 do not rotate together. At this point, the torque applied when rotating the second force transmission assembly 120 is greater than the elastic force of the elastic element 130, and the second force transmission assembly 120 rotates relative to the first force transmission assembly 110. The relative rotation of the second force transmission assembly 120 and the first force transmission assembly 110 indicates that the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached their assembly torque. At this point, rotation of the second force transmission assembly 120 is stopped, thus completing the assembly of the shaft assembly 11 and the ultrasonic transducer 12. Therefore, the torque wrench 100 described above can be used to assemble the shaft assembly 11 and the ultrasonic transducer 12 according to a preset assembly torque, thereby limiting the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 to a suitable range.

[0043] Of course, in actual operation, when the torque wrench 100 is used to thread the shaft assembly 11 of the ultrasonic surgical instrument 10 to the ultrasonic transducer 12, it can also be used to fix the second force transmission assembly 120 to the shaft assembly 11. In the initial stage of threading the shaft assembly 11 to the ultrasonic transducer 12, a torque is applied to the first force transmission assembly 110 to make the first force transmission assembly 110 rotate, thereby driving the second force transmission assembly 120 to rotate together with the first force transmission assembly 110 through the elastic element 130, thereby driving the shaft assembly 11 and the ultrasonic transducer 12 to gradually tighten. Until the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches the assembly torque of the two (that is, equal to the elastic force of the elastic element 130 when the limiting structure 121 and the mating structure 111 abut in the first direction), the shaft assembly 11 and the ultrasonic transducer 12 are tightened, so that the second force transmission assembly 120 and the shaft assembly 11 do not rotate together. At this point, the torque applied when the first force transmission component 110 is rotated is greater than the elastic force of the elastic element 130, and the second force transmission component 120 rotates relative to the first force transmission component 110. It can be determined that the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached the assembly torque of the two. At this point, stop rotating the first force transmission component 110, and the assembly of the shaft assembly 11 and the ultrasonic transducer 12 is completed.

[0044] The torque wrench 100 described above is used to fix the shaft assembly 11 to one of the first force transmission assembly 110 and the second force transmission assembly 120 when threading the shaft assembly 11 of the ultrasonic surgical instrument 10 to the ultrasonic transducer 12. In the initial stage of threading the shaft assembly 11 to the ultrasonic transducer 12, by applying torque to the other of the first force transmission assembly 110 and the second force transmission assembly 120, the elastic element 130 drives the first force transmission assembly 110 and the second force transmission assembly 120 to rotate together, thereby gradually tightening the shaft assembly 11 to the ultrasonic transducer 12. Until the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches their assembly torque (i.e., equal to the elastic force of the elastic element 130 when the limiting structure 121 and the mating structure 111 abut in the first direction), the shaft assembly 11 and the ultrasonic transducer 12 are tightened, and the shaft assembly 11 does not rotate. Therefore, one of the first force transmission components 110 and the second force transmission component 120, which is fixedly connected to the shaft assembly 11, does not rotate. Continuing to rotate the other of the first force transmission components 110 and the second force transmission component 120 causes relative rotation between them. The relative rotation between the second force transmission component 120 and the first force transmission component 110 indicates that the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached their assembly torque. At this point, stopping the rotation of the other of the first force transmission components 110 and the second force transmission component 120 completes the assembly of the shaft assembly 11 and the ultrasonic transducer 12. Therefore, the torque wrench 100 described above can be used to assemble the shaft assembly 11 and the ultrasonic transducer 12 according to a preset assembly torque, thereby limiting the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 to a suitable range.

[0045] Specifically, in this embodiment, the elastic element 130 is a helical spring, and its axial direction is along the first direction.

[0046] In other embodiments, the elastic element may also be an elastic body made of elastic material, with its extension direction along the first direction.

[0047] refer to Figures 2 to 5In one embodiment, the first force transmission component 110 includes a first force transmission body 112 and a first connecting portion 113 connected to the first force transmission body 112. The second force transmission component 120 includes a second force transmission body 122. An arcuate groove 101 extending along a first direction is formed inside the second force transmission body 122. The arcuate groove 101 has a first groove wall 123 facing the first direction, and the first connecting portion 113 and the elastic member 130 are located within the arcuate groove 101. One end of the elastic member 130 along the first direction abuts against the first groove wall 123, and the other end abuts against the first connecting portion 113. Thus, when the second force transmission component 120 drives the first force transmission component 110 to rotate synchronously through the elastic member 130, the torque applied to the second force transmission component 120 is sequentially transmitted from the first groove wall 123 to the elastic member 130 and the first connecting portion 113. Since the first connecting part 113 and the elastic member 130 are located in the arc groove 101, the arc groove 101 can limit the elastic deformation of the elastic member 130 along the first direction, and the moving direction of the first connecting part 113 is along the first direction. Therefore, when the torque applied to the second force transmission component 120 is transmitted from the first groove wall 123 to the elastic member 130 and the first connecting part 113 in sequence, the force transmission direction can be transmitted more accurately along the first direction. This is beneficial to the smooth movement of the first force transmission component 110 and the second force transmission component 120, and to the accurate assembly of the shaft assembly 11 and the ultrasonic transducer 12 according to the preset assembly torque.

[0048] Furthermore, the connection between the elastic element 130 and the second connecting portion 123 can be a non-detachable connection, such as welding, or a detachable connection, such as abutment or snap-fit. The connection between the elastic element 130 and the first connecting portion 113 can be a non-detachable connection, such as welding, or a detachable connection, such as abutment or snap-fit.

[0049] In other embodiments, the first force transmission component may not include the first connecting portion. For example, one end of the elastic member along the first direction is directly connected to the first force transmission body, and the other end is directly connected to the second force transmission body.

[0050] refer to Figure 3 In one embodiment, the second force transmission component 120 further includes an inner retaining ring 124. The inner retaining ring 124 is disposed inside the second force transmission body 122, so that the arcuate groove 101 can be formed between the inner retaining ring 124 and the second force transmission body 122. Therefore, the elastic member 130 and the first connecting portion 113 are located between the inner retaining ring 124 and the second force transmission body 122. The inner retaining ring 124 is directly or indirectly connected to the second force transmission body 122. A baffle is also provided between the inner retaining ring 124 and the second force transmission body 122, and the surface of the baffle forms a first groove wall 123.

[0051] Specifically, in this embodiment, the inner retaining ring 124 has a closed annular structure.

[0052] In other embodiments, the inner retaining ring may also be an open annular structure (i.e., an arc-shaped structure).

[0053] In one embodiment, there are multiple arc-shaped grooves 101, which are spaced apart along a first direction. Each arc-shaped groove 101 is provided with a corresponding first connecting part 113 and an elastic element 130, so that the resultant force of the elastic force provided by the multiple elastic elements 130 along the first direction is large, thereby facilitating the provision of a large assembly torque for the shaft assembly 11 and the ultrasonic transducer 12.

[0054] like Figures 3 to 5 As shown, in this embodiment, there are three arc-shaped grooves 101. Correspondingly, there are three elastic elements 130. Adjacent arc-shaped grooves 101 are separated by a baffle.

[0055] In other embodiments, the number of arc-shaped grooves can be three, or it can be one, two, four, or other numbers.

[0056] Preferably, the multiple elastic elements 130 are evenly spaced along the first direction, which is beneficial to ensure that when the second force transmission component 120 rotates relative to the first force transmission component 110, the force is balanced at each position along the first direction, and the movement process is stable.

[0057] refer to Figure 3 In one embodiment, the arc-shaped groove 101 has a second groove wall 125 facing the axial direction of the arc-shaped groove 101. A limiting structure 121 is provided on the second groove wall 125, and a mating structure 111 is provided on the first connecting part 113, thereby facilitating the assembly of the limiting structure 121 and the mating structure 111.

[0058] Furthermore, since the second groove wall 125 faces the axial direction of the arc groove 101, the second groove wall 125 can restrict the elastic element 130 from shifting or deforming along the axial direction of the second force transmission body 122 to the side away from the first force transmission body 112, so that the force transmission direction of the elastic element 130 can be transmitted more accurately along the first direction, which is conducive to the smooth movement of the first force transmission assembly 110 and the second force transmission assembly 120, and conducive to the accurate assembly of the shaft assembly 11 and the ultrasonic transducer 12 according to the preset assembly torque.

[0059] Specifically, in this embodiment, the second force transmission component 120 further includes a limiting plate. The limiting plate is connected to the second force transmission body 122, and the surface of the limiting plate forms the second groove wall 125.

[0060] In other embodiments, the mating structure may also be located on the first force-transmitting body. The limiting structure may also be located on the inner retaining ring or the second force-transmitting body.

[0061] refer to Figures 3 to 5In one embodiment, the second force transmission component 120 is provided with a limiting groove 102. The mating structure 111 can be a sliding column or a slider, etc. The mating structure 111 and the limiting groove 102 are slidably engaged along a first direction. The limiting structure 121 is the groove wall of one end of the limiting groove 102 along the first direction, and the mating structure 111 can slide relative to the limiting groove 102 along the first direction through the elastic deformation of the elastic member 130.

[0062] like Figure 4 As shown, the elastic force of the elastic element 130 causes the limiting structure 121 to abut against the mating structure 111, that is, the mating structure 111 abuts against the groove wall of the limiting slide groove 102 at one end along the first direction. Figure 5 As shown, when the torque applied to the second force transmission component 120 along the first direction exceeds the elastic force of the elastic member 130, the elastic member 130 undergoes elastic deformation along the first direction. The first force transmission component 110 and the second force transmission component 120 rotate relative to each other along the first direction, and the limiting structure 121 separates from the mating structure 111 along the first direction, that is, the mating structure 111 separates from the groove wall of the limiting slide groove 102 along the first direction. During this process, the mating structure 111 slides relative to each other within the limiting slide groove 102 along the first direction.

[0063] Furthermore, by sliding the limiting groove 102 and the mating structure 111 along the first direction, the relative movement direction of the first force transmission component 110 and the second force transmission component 120 can be limited to the first direction only, preventing the first force transmission component 110 and the second force transmission component 120 from moving relative to each other in other directions. This is conducive to the smooth movement of the first force transmission component 110 and the second force transmission component 120, and to the accurate assembly of the shaft assembly 11 and the ultrasonic transducer 12 according to the preset assembly torque.

[0064] In other embodiments, the second force transmission component may have a mating structure, and the first force transmission component may have a limiting groove. The mating structure and the limiting groove may slide together along a first direction. The limiting structure is a mating structure, and the mating structure is the groove wall at one end of the limiting groove along the first direction.

[0065] In other embodiments, the limiting part can also be a limiting protrusion, a limiting plate, etc., and the mating part can also be a mating protrusion, a mating plate, etc.

[0066] Please combine Figures 2 to 5In one embodiment, the first force transmission body 112 is provided with a first indicating structure 114, and the second force transmission body 122 is provided with a second indicating structure 126. When the first force transmission body 112 and the second force transmission body 122 rotate relative to each other in a first direction, the first indicating structure 114 and the second indicating structure 126 also rotate relative to each other in the first direction. By changing the relative position of the first indicating structure 114 and the second indicating structure 126, the relative position of the first force transmission assembly 110 and the second force transmission assembly 120 along the first direction can be indicated, thereby facilitating the determination of whether the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached the preset assembly torque.

[0067] Please combine Figures 2 to 5 In one embodiment, the first indicating structure 114 is a first protrusion that protrudes radially outward from the first force-transmitting body 112. The second indicating structure 126 is a second protrusion that protrudes radially outward from the second force-transmitting body 122, thereby facilitating the identification of changes in the relative positions of the first and second protrusions.

[0068] In other embodiments, the first indicating structure may also be a pointer, an indicating scale, an indicating pattern, etc. The second indicating structure may also be a pointer, an indicating scale, an indicating pattern, etc.

[0069] Please refer to Figure 4 In one embodiment, the first protrusion (first indicating structure 114) and the second protrusion (second indicating structure 126) are arranged along the axial direction of the first force transmission assembly 110 and the second force transmission assembly 120. When the limiting structure 121 and the mating structure 111 abut against each other along the first direction, the two ends of the first protrusion (first indicating structure 114) along the first direction are respectively aligned with the two ends of the second protrusion (second indicating structure 126) along the first direction. Therefore, in Figure 4 In the first part, the first protrusion (first indicator structure 114) blocks the second protrusion (second indicator structure 126). As long as the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126) rotate slightly relative to each other in the first direction, the two ends of the first protrusion (first indicator structure 114) in the first direction will be misaligned (misaligned) with the two ends of the second protrusion (second indicator structure 126) in the first direction. In this way, it is possible to quickly determine whether the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached the preset assembly torque.

[0070] Please refer to Figure 5In another embodiment, the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126) are arranged along a first direction. When the limiting structure 121 and the mating structure 111 abut against each other along the first direction, the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126) abut against each other along the first direction, so that there is no gap between the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126). As long as the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126) undergo a slight relative rotation along the first direction, a gap will be generated between the first protrusion (first indicator structure 114) and the second protrusion (second indicator structure 126). In this way, it is also possible to quickly determine whether the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 has reached the preset assembly torque.

[0071] Please refer to Figure 2 In one embodiment, the first force transmission component 110 further includes a mounting plate 115. The mounting plate 115 is connected to the first force transmission body 112, and the first indicating structure 114 is disposed on the mounting plate 115, thereby indirectly disposed on the first force transmission body 112. Specifically, in this embodiment, the mounting plate 115 is disposed on one side of the second force transmission body 122 along the axial direction, so that the mounting plate 115 and the first indicating structure 114 can be exposed on the outside of the second force transmission body 122, making it easier to observe the relative positions of the first indicating structure 114 and the second indicating structure 126.

[0072] Specifically, in this embodiment, a shaft sleeve 118 is provided on the first force transmission body 112. The mounting plate 115 is sleeved on the shaft sleeve 118, thereby facilitating the installation of the mounting plate 115. Of course, the mounting plate 115 can also be installed on the first force transmission body 112 in other ways.

[0073] Please refer to Figure 2 In one embodiment, the mounting plate 115 is provided with a first positioning structure 116, and the first force transmission body 112 is provided with a second positioning structure 117. The cooperation of the first positioning structure 116 and the second positioning structure 117 defines the relative position of the mounting plate 115 and the first force transmission body 112 along the first direction, thereby enabling the first force transmission body 112 and the mounting plate 115 to rotate together relative to the second force transmission body 122. This allows for accurate determination of the relative position of the first indicating structure 114 and the second indicating structure 126, so as to accurately determine whether the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches the preset assembly torque.

[0074] Specifically, in this embodiment, the first positioning structure 116 is provided with an insertion hole 103, and the second positioning structure 117 is inserted into the insertion hole 103 along the axial direction of the first force transmission body 112, thereby realizing the cooperation between the first positioning structure 116 and the second positioning structure 117.

[0075] In other embodiments, the second positioning structure may be provided with a socket, and the first positioning structure may be inserted into the socket along the axial direction of the first force transmission body, thereby realizing the cooperation between the first positioning structure and the second positioning structure.

[0076] In one embodiment, the second positioning structure 117 corresponds to the first connecting portion 113 along the axial direction of the first force-transmitting body 112, thereby facilitating processing and assembly. The second positioning structure 117, the first connecting portion 113, and the first force-transmitting body 112 can be integrally formed.

[0077] refer to Figures 2 to 5 In one embodiment, multiple limiting structures 121 are arranged sequentially at intervals along the first direction, and the limiting structures 121 correspond one-to-one with the mating structures 111. Thus, when the elastic force provided by the elastic member 130 along the first direction is large, it can withstand a large elastic force through the cooperation of the multiple limiting structures 121 and the corresponding mating structures 111.

[0078] Specifically, a corresponding limiting structure 121 and a mating structure 111 can be provided in each arc-shaped groove 101.

[0079] Preferably, the multiple limiting structures 121 are evenly spaced along the first direction, which is beneficial to the balanced force at each position along the first direction when the second force transmission component 120 rotates relative to the first force transmission component 110, and the movement process is stable.

[0080] In other embodiments, the number of limiting structures may also be one.

[0081] like Figure 1 As shown, one embodiment of this application also provides an ultrasonic surgical instrument 10, including a shaft assembly 11, an ultrasonic transducer 12, and a torque wrench 100 of any of the above embodiments. The shaft assembly 11 is inserted through the first force transmission assembly 110 and the second force transmission assembly 120, and the shaft assembly 11 is fixedly connected to the first force transmission assembly 110 or the second force transmission assembly 120. The shaft assembly 11 is threadedly connected to the ultrasonic transducer 12.

[0082] In one embodiment, the ultrasonic surgical instrument 10 also includes a handle 13. A torque wrench 100 is mounted on the handle 13.

[0083] When the shaft assembly 11 of the aforementioned ultrasonic surgical instrument 10 is threadedly connected to the ultrasonic transducer 12, the shaft assembly 11 is fixedly connected to one of the first force transmission assembly 110 and the second force transmission assembly 120. In the initial stage of the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12, a torque is applied to the other of the first force transmission assembly 110 and the second force transmission assembly 120, thereby causing the elastic element 130 to drive the first force transmission assembly 110 and the second force transmission assembly 120 to rotate together, thus gradually tightening the shaft assembly 11 and the ultrasonic transducer 12. Until the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches their assembly torque (i.e., equal to the elastic force of the elastic element 130 when the limiting structure 121 and the mating structure 111 abut in the first direction), the shaft assembly 11 and the ultrasonic transducer 12 are tightened, the shaft assembly 11 does not rotate, and thus the one of the first force transmission assembly 110 and the second force transmission assembly 120 fixedly connected to the shaft assembly 11 does not rotate. Continuing to rotate the other of the first force transmission component 110 and the second force transmission component 120 causes relative rotation between them. The relative rotation between the second force transmission component 120 and the first force transmission component 110 indicates that the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 has reached the required assembly torque. At this point, stopping the rotation of the other of the first force transmission component 110 and the second force transmission component 120 completes the assembly of the shaft assembly 11 and the ultrasonic transducer 12. Therefore, the torque wrench 100 allows the shaft assembly 11 and the ultrasonic transducer 12 to be assembled according to a pre-set assembly torque, thus limiting the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 to a suitable range.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A torque wrench, characterized in that, The torque wrench includes a first force transmission component (110), a second force transmission component (120), and an elastic element (130); the elastic force of the elastic element (130) is directed along a first direction, and the two ends of the elastic element (130) along the first direction are respectively connected to the second force transmission component (120) and the first force transmission component (110), wherein the first direction is the direction in which the first force transmission component (110) and the second force transmission component (120) rotate relative to each other; The second force transmission component (120) is provided with a limiting structure (121), and the first force transmission component (110) is provided with a mating structure (111). The elastic force of the elastic member (130) can cause the limiting structure (121) and the mating structure (111) to abut against each other along the first direction. The elastic deformation of the elastic member (130) can cause the limiting structure (121) and the mating structure (111) to separate along the first direction. The first force transmission component (110) includes a first force transmission body (112) and a first connecting portion (113) connected to the first force transmission body (112); the second force transmission component (120) includes a second force transmission body (122), and an arcuate groove (101) extending in a first direction is formed inside the second force transmission body (122); the arcuate groove (101) has a first groove wall (123) facing the first direction, the first connecting portion (113) and the elastic member (130) are located in the arcuate groove (101), one end of the elastic member (130) along the first direction abuts against the first groove wall (123), and the other end abuts against the first connecting portion (113). The second force transmission component (120) is provided with a limiting slide groove (102). The limiting structure (121) is the groove wall of one end of the limiting slide groove (102) along the first direction. The elastic deformation of the elastic member (130) enables the mating structure (111) to slide relative to each other in the limiting slide groove (102) along the first direction. The first force transmission component (110) further includes a mounting plate (115), a first indicating structure (114) is disposed on the mounting plate (115), the mounting plate (115) is connected to the first force transmission body (112), the mounting plate (115) is located on one side of the second force transmission body (122) along the axial direction, the second force transmission body (122) is provided with a second indicating structure (126); a shaft cylinder (118) is provided on the first force transmission body (112), and the mounting plate (115) is sleeved on the shaft cylinder (118); The mounting plate (115) is provided with a first positioning structure (116), and the first force transmission body (112) is provided with a second positioning structure (117). The first positioning structure (116) and the second positioning structure (117) cooperate to limit the relative position of the mounting plate (115) and the first force transmission body (112) along the first direction. The first positioning structure (116) is provided with an insertion hole (103), and the second positioning structure (117) is inserted into the insertion hole (103) along the axial direction of the first force transmission body (112).

2. The torque wrench according to claim 1, characterized in that, The number of the arc-shaped grooves (101) is one; or, The number of the arc-shaped grooves (101) is multiple, and the multiple arc-shaped grooves (101) are spaced apart along the first direction. Each arc-shaped groove (101) is provided with the corresponding first connecting part (113) and the elastic member (130).

3. The torque wrench according to claim 1, characterized in that, The arc-shaped groove (101) has a second groove wall (125) facing the axial direction of the arc-shaped groove (101), the limiting structure (121) is provided on the second groove wall (125), and the mating structure (111) is provided on the first connecting part (113).

4. The torque wrench according to claim 1, characterized in that, The first indicating structure (114) is a first protrusion and protrudes outward from the first force transmission body (112) along the radial direction. The second indicating structure (126) is a second protrusion and protrudes outward from the second force transmission body (122) along the radial direction. When the limiting structure (121) and the mating structure (111) abut against each other in the first direction, the first protrusion and the second protrusion abut against each other in the first direction.

5. The torque wrench according to claim 1, characterized in that, The first indicating structure (114) is a first protrusion and protrudes outward from the first force transmission body (112) along the radial direction. The second indicating structure (126) is a second protrusion and protrudes outward from the second force transmission body (122) along the radial direction. When the limiting structure (121) and the mating structure (111) abut against each other along the first direction, the two ends of the first protrusion along the first direction are aligned with the two ends of the second protrusion along the first direction.

6. An ultrasonic surgical instrument, characterized in that, The device includes a shaft assembly (11), an ultrasonic transducer (12), and a torque wrench according to any one of claims 1 to 5. The shaft assembly (11) passes through the first force transmission assembly (110) and the second force transmission assembly (120), and the shaft assembly (11) is fixedly connected to the first force transmission assembly (110) or the second force transmission assembly (120). The shaft assembly (11) is threadedly connected to the ultrasonic transducer (12).

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