CN114343785A

CN114343785A - Torque wrench and ultrasonic surgical instrument

Info

Publication number: CN114343785A
Application number: CN202111591717.4A
Authority: CN
Inventors: 郝权明
Original assignee: Wuhan United Imaging Zhirong Medical Technology Co Ltd
Current assignee: Wuhan United Imaging Zhirong Medical Technology Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-04-15

Abstract

The invention relates to a torque wrench and an ultrasonic surgical instrument. The torque wrench comprises a first force transmission assembly and a second force transmission assembly, wherein one of the first force transmission assembly and the second force transmission assembly is arranged around the outer side of the other one of the first force transmission assembly and the second force transmission assembly; the first force transmission assembly is provided with at least one first friction structure, the second force transmission assembly is provided with at least one second friction structure, and the first force transmission assembly and the second force transmission assembly realize friction transmission through the first friction structure and the second friction structure. When the torque wrench is used for screwing the shaft assembly of the ultrasonic surgical instrument and the ultrasonic transducer, the screwing force between the shaft assembly and the ultrasonic transducer can be limited within a proper range.

Description

Torque wrench and ultrasonic surgical instrument

Technical Field

The invention relates to the technical field of medical instruments, in particular to a torque wrench and an ultrasonic surgical instrument.

Background

The ultrasonic surgical instrument generally comprises an end effector, a shaft assembly and an ultrasonic transducer which are sequentially connected, wherein the ultrasonic energy is converted into mechanical energy by the ultrasonic transducer, and the mechanical energy is transmitted to the end effector through a waveguide rod in the shaft assembly, so that the end effector transmits energy to local tissues of a human body, and the aim of surgical treatment is fulfilled.

In ultrasonic surgical instruments, the shaft assembly and the ultrasonic transducer are typically connected by a threaded connection. However, at present, when assembling an ultrasonic surgical instrument, it is difficult to control the screwing force at the threaded connection of the shaft assembly and the ultrasonic transducer within a suitable range. If the screwing force at the threaded connection of the shaft assembly and the ultrasonic transducer is insufficient, the vibration energy transmitted to the end effector through the shaft assembly is reduced, and the effect of surgical treatment is affected. If the screwing force at the threaded connection between the shaft assembly and the ultrasonic transducer is too large, the threaded connection between the shaft assembly and the ultrasonic transducer may be damaged.

Disclosure of Invention

In view of the above, it is necessary to provide a torque wrench and an ultrasonic surgical instrument, which can control the screwing force at the threaded connection between the shaft assembly and the ultrasonic transducer within a suitable range when the torque wrench is used for assembling the ultrasonic surgical instrument, in order to solve the problem that it is difficult to control the screwing force at the threaded connection between the shaft assembly and the ultrasonic transducer within a suitable range at the time of assembling the ultrasonic surgical instrument.

An embodiment of the present application provides a torque wrench, which includes a first force transmission assembly and a second force transmission assembly, one of the first force transmission assembly and the second force transmission assembly being enclosed outside the other; the first force transmission assembly is provided with at least one first friction structure, the second force transmission assembly is provided with at least one second friction structure, and the first force transmission assembly and the second force transmission assembly realize friction transmission through the first friction structure and the second friction structure.

When the torque wrench is used for connecting the shaft assembly and the ultrasonic transducer in a threaded manner, the shaft assembly is fixedly connected with one of the first force transmission assembly and the second force transmission assembly. At the initial stage of threaded connection of the shaft assembly and the ultrasonic transducer, torsion is applied to the other one of the first force transmission assembly and the second force transmission assembly, so that the first force transmission assembly and the second force transmission assembly are driven to rotate together through friction transmission of the first friction structure and the second friction structure, and the shaft assembly and the ultrasonic transducer are driven to be screwed gradually. When the screwing force of the shaft assembly and the ultrasonic transducer reaches the assembling torque force of the shaft assembly and the ultrasonic transducer (namely, the screwing force is equal to the maximum static friction force between the first friction structure and the second friction structure), the shaft assembly and the ultrasonic transducer are screwed, the shaft assembly does not rotate, and one of the first force transmission assembly and the second force transmission assembly fixedly connected with the shaft assembly does not rotate. And the other of the first force transmission assembly and the second force transmission assembly is rotated continuously, so that the first force transmission assembly and the second force transmission assembly rotate relatively. At this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure and the second friction structure cannot drive the shaft assembly to be continuously screwed relative to the ultrasonic transducer, that is, the screwing force between the shaft assembly and the ultrasonic transducer cannot be continuously increased, so that the screwing force between the shaft assembly and the ultrasonic transducer can be limited within a proper range.

In an embodiment, the second force transmission assembly comprises a second force transmission body, the second friction structures are arranged on the second force transmission body, and the second friction structures are sequentially arranged at intervals along the circumferential direction of the second force transmission body;

and/or, first power transmission subassembly includes first power transmission body, first friction structure set up in first power transmission body, it is a plurality of first friction structure is followed the circumference of first power transmission body is interval arrangement in proper order.

In an embodiment, the first force transmission assembly includes a first force transmission body and an elastic member, the elastic member is disposed corresponding to the first friction structure, two ends of the elastic member are respectively connected to the first force transmission body and the corresponding first friction structure, and the elastic force of the elastic member enables the corresponding first friction structure to abut against the second friction structure.

In one embodiment, the first force transfer assembly further comprises: the positioning piece penetrates through or is sleeved on the first force transmission body, and a positioning hole matched with the first friction structure is formed in the side wall of the positioning piece.

In one embodiment, the torque wrench further comprises an auxiliary disassembling assembly, the auxiliary disassembling assembly has a first state and a second state which can be switched with each other, and in the first state, the auxiliary disassembling assembly locks the second force transmission assembly and the first force transmission assembly, so that the second force transmission assembly and the first force transmission assembly rotate together; in the second state, the auxiliary dismounting assembly enables the first force transmission assembly and the second force transmission assembly to be unlocked, and the first force transmission assembly and the second force transmission assembly achieve friction transmission through the first friction structure and the second friction structure.

In one embodiment, the auxiliary disconnect assembly is connected to and co-rotates with the second force transfer assembly; the auxiliary disassembling assembly is provided with a first limiting structure, and the first force transmission assembly is provided with a first matching structure; when the auxiliary dismounting assembly is in the first state, the first limiting structure is matched with the first matching structure, so that the first force transmission assembly and the auxiliary dismounting assembly rotate together; when the auxiliary dismounting component is in the second state, the first limiting structure releases the first matching structure, so that the auxiliary dismounting component releases the first force transmission component.

In an embodiment, one of the first limiting structure and the first matching structure is a first limiting protrusion, and the other one of the first limiting structure and the first matching structure is a first limiting hole, and the first limiting protrusion and the first limiting hole are in plug-in fit along the axial direction of the second force transmission assembly.

In an embodiment, one of the auxiliary detaching assembly and the second force transmission assembly is provided with a second limiting protrusion, and the other one of the auxiliary detaching assembly and the second force transmission assembly is provided with a second limiting groove, and the second limiting protrusion and the second limiting groove are in insertion fit along the axial direction of the second force transmission assembly.

In an embodiment, the second limit groove includes a first groove section and a second groove section that are communicated with each other, the first groove section is located on one side of the second groove section along a direction in which the second limit protrusion is inserted into the second limit groove, and a width of the second groove section along the first direction is greater than a width of the first groove section along the first direction, wherein the first direction is a circumferential direction of the second force transmission assembly; when the auxiliary dismounting assembly is in the first state, the second limiting convex part is matched with the first groove section and matched with the second groove section, and when the auxiliary dismounting assembly is switched from the first state to the second state, the second limiting convex part is moved out of the first groove section and matched with the second groove section.

An embodiment of the present application provides an ultrasonic surgical instrument, including a shaft assembly, an ultrasonic transducer, and the torque wrench of any one of the above, wherein the shaft assembly is inserted into the first force transmission assembly and the second force transmission assembly, and the shaft assembly is fixedly connected to the first force transmission assembly or the second force transmission assembly, and the shaft assembly is in threaded connection with the ultrasonic transducer.

When the shaft assembly of the ultrasonic surgical instrument is in threaded connection with the ultrasonic transducer, the shaft assembly is fixedly connected with one of the first force transmission assembly and the second force transmission assembly. At the initial stage of threaded connection of the shaft assembly and the ultrasonic transducer, torsion is applied to the other one of the first force transmission assembly and the second force transmission assembly, so that the first force transmission assembly and the second force transmission assembly are driven to rotate together through friction transmission of the first friction structure and the second friction structure, and the shaft assembly and the ultrasonic transducer are driven to be screwed gradually. When the screwing force of the shaft assembly and the ultrasonic transducer reaches the assembling torque force of the shaft assembly and the ultrasonic transducer (namely, the screwing force is equal to the maximum static friction force between the first friction structure and the second friction structure), the shaft assembly and the ultrasonic transducer are screwed, the shaft assembly does not rotate, and one of the first force transmission assembly and the second force transmission assembly fixedly connected with the shaft assembly does not rotate. And the other of the first force transmission assembly and the second force transmission assembly is rotated continuously, so that the first force transmission assembly and the second force transmission assembly rotate relatively. At this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure and the second friction structure cannot drive the shaft assembly to be continuously screwed relative to the ultrasonic transducer, that is, the screwing force between the shaft assembly and the ultrasonic transducer cannot be continuously increased, so that the screwing force between the shaft assembly and the ultrasonic transducer can be limited within a proper range.

Drawings

FIG. 1 is a schematic structural view of an exemplary ultrasonic surgical instrument;

fig. 2 is an exploded view of the torque wrench of fig. 1.

The reference numbers illustrate:

an ultrasonic surgical instrument 10; a shaft assembly 11; an ultrasonic transducer 12; a handle 13;

a torque wrench 100;

a first force transfer assembly 110; a first friction structure 111; a first force transfer body 112; an elastic member 113; a positioning member 114; a positioning hole 101; a collar 115; a first mating structure 102;

a second force transfer assembly 120; a connection ring 121; a second friction structure 1211; a second force transfer body 122; a second mating structure 103; a first tank section 1031; a second slot segment 1032; the first tank wall 1031 a; second slot wall 1032 a; a step surface 1033;

an auxiliary detachment assembly 130; a first limiting structure 131; auxiliary disassembly body 132; a second limiting structure 133.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly abutting the first and second features, or the first and second features may be indirectly abutting through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, an embodiment of the present application provides a torque wrench 100. The torque wrench 100 is used to threadedly connect the shaft assembly 11 of the ultrasonic surgical instrument 10 with the ultrasonic transducer 12. The torque wrench 100 includes a first force transfer assembly 110 and a second force transfer assembly 120.

One of the first force transfer assembly 110 and the second force transfer assembly 120 is enclosed outside the other. The enclosure may be a circle around the first force transmission assembly 110 or the second force transmission assembly 120. The enclosure may also be less than one circumferential, i.e. partially circumferential, angle around the circumference of the first force transfer assembly 110 or the second force transfer assembly 120. In particular, in this embodiment, the second force transfer assembly 120 is enclosed outside the first force transfer assembly 110.

Of course, in other embodiments, the first force transfer assembly may be arranged around the outside of the second force transfer assembly.

The first force transfer assembly 110 has at least one first friction structure 111. The second force transfer assembly 120 has at least one second friction structure 1211. The first force transmission assembly 110 and the second force transmission assembly 120 realize friction transmission through the first friction structure 111 and the second friction structure 1211.

The torque wrench 100 is used to thread the shaft assembly 11 of the ultrasonic surgical instrument 10 to the ultrasonic transducer 12, to thread the shaft assembly 11 through the first force transfer assembly 110 and the second force transfer assembly 120, and to fixedly connect the first force transfer assembly 110 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 driven to rotate by the first force transmission assembly 110 and the second force transmission assembly 120, so that the shaft assembly 11 is screwed with the ultrasonic transducer 12.

Specifically, in designing the structure of the shaft assembly 11 and the ultrasonic transducer 12, the assembling torque force (i.e., the screwing force when screwing) of the shaft assembly 11 and the ultrasonic transducer 12 is set in advance to be equal to the maximum static friction force between the first friction structure 111 and the second friction structure 1211.

In the initial stage of the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12, the screwing force between the shaft assembly 11 and the ultrasonic transducer 12 is smaller than the assembling torque force of the shaft assembly 11 and the ultrasonic transducer 12, and the torque force required to be applied to rotate the shaft assembly 11 is smaller than the assembling torque force of the shaft assembly 11 and the ultrasonic transducer 12 (i.e., smaller than the maximum static friction force between the first friction structure 111 and the second friction structure 1211). Therefore, applying a torque force to the second force transmission assembly 120 to rotate the second force transmission assembly 120 can cause the first force transmission assembly 110 to rotate together with the second force transmission assembly 120 through the friction transmission between the first friction structure 111 and the second friction structure 1211, so as to gradually tighten the shaft assembly 11 and the ultrasonic transducer 12.

As the shaft assembly 11 and the ultrasonic transducer 12 are gradually tightened, the torque force required to be applied when rotating the shaft assembly 11 also gradually increases. Until the screwing force of the shaft assembly 11 and the ultrasonic transducer 12 reaches the assembling torque force of the shaft assembly 11 and the ultrasonic transducer 12 (i.e. equal to the maximum static friction force between the first friction structure 111 and the second friction structure 1211), the shaft assembly 11 and the ultrasonic transducer 12 are screwed, so that the first force transmission assembly 110 and the shaft assembly 11 do not rotate together. At this time, the torque applied when the second force transmission assembly 120 is rotated is larger than the maximum static friction force between the first friction structure 111 and the second friction structure 1211, so that the second force transmission assembly 120 and the first force transmission assembly 110 rotate relatively. At this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure 111 and the second friction structure 1211 cannot drive the shaft assembly 11 to be screwed with respect to the ultrasonic transducer 12, i.e. it is limited that the screwing force of the shaft assembly 11 and the ultrasonic transducer 12 cannot be increased. It can be seen that the tightening force between the shaft assembly 11 and the ultrasonic transducer 12 can be limited to a suitable range when the ultrasonic surgical instrument 10 is assembled by the torque wrench 100 described above.

Of course, in practice, when the torque wrench 100 is used to threadably connect the shaft assembly 11 of the ultrasonic surgical instrument 10 to the ultrasonic transducer 12, it is also possible to fixedly connect the second force transfer assembly 120 to the shaft assembly 11. At the initial stage of the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12, the first force transmission assembly 110 is rotated by applying a torque to the first force transmission assembly 110, so that the frictional transmission between the first friction structure 111 and the second friction structure 1211 causes the second force transmission assembly 120 to rotate together with the first force transmission assembly 110, thereby gradually screwing the shaft assembly 11 and the ultrasonic transducer 12. Until the tightening force of the shaft assembly 11 and the ultrasonic transducer 12 reaches the assembling torque force of the shaft assembly 11 and the ultrasonic transducer 12 (i.e., equal to the maximum static friction force between the first friction structure 111 and the second friction structure 1211), 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 time, the torque applied when the first force transmission assembly 110 is continuously rotated is greater than the maximum static friction force between the first friction structure 111 and the second friction structure 1211, and the second force transmission assembly 120 and the first force transmission assembly 110 rotate relatively. At this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure 111 and the second friction structure 1211 cannot drive the shaft assembly 11 to be screwed with respect to the ultrasonic transducer 12, i.e. it is limited that the screwing force of the shaft assembly 11 and the ultrasonic transducer 12 cannot be increased.

In an embodiment, the second friction structure 1211 may be a rough surface with concave and convex points, or a surface with concave and convex lines, or a structure made of a material with a high friction coefficient, so that the first friction structure 111 and the second friction structure 1211 can have a large friction force, thereby achieving a good friction transmission.

Of course, in other embodiments, the first friction structure may also be a rough surface with concave-convex points, or a surface with concave-convex lines, or a structure made of a material with a high friction coefficient.

Referring to fig. 2, in an embodiment, the second force transmission assembly 120 includes a second force transmission body 122. The second friction structures 1211 are disposed on the second force transmission body 122, and the plurality of second friction structures 1211 are sequentially arranged at intervals along the circumferential direction of the second force transmission body 122. The first force transmission assembly 110 includes a first force transmission body 112, a first friction structure 111 disposed on the first force transmission body 112, and a plurality of first friction structures 111 sequentially arranged at intervals along a circumferential direction of the first force transmission body 112. In the embodiment, the plurality of first friction structures 111 correspond to the plurality of second friction structures 1211 in a one-to-one manner, so that the plurality of second friction structures 1211 respectively perform friction transmission with the plurality of first friction structures 111, so that a stronger transmission force can be provided between the second force transmission assembly 120 and the first force transmission assembly 110, and a larger assembly torque force can be conveniently provided for the shaft assembly 11 and the ultrasonic transducer 13. Specifically, in the present embodiment, the number of the first friction structures 111 is three, and the number of the second friction structures 1211 is three. Of course, the number of the first friction structures 111 may be other numbers, such as two, four, five, etc., and the number of the second friction structures 1211 may be other numbers, such as two, four, five, etc.

In a preferred embodiment, the plurality of second friction structures 1211 are evenly spaced along the circumference of the second force transfer body 122 and the plurality of first friction structures 111 are evenly spaced along the circumference of the first force transfer body 112.

In other embodiments, the number of first friction structures may be one. The number of the second friction structures may be one.

In other embodiments, the first friction structures and the second friction structures may not correspond to each other, and the number of the first friction structures may be smaller than the number of the second friction structures. For example, the number of the first friction structures is one, the number of the second friction structures is multiple, the second friction structures are sequentially arranged at intervals along the circumferential direction of the second force transmission body, and the first friction structures are selectively matched with any one of the second friction structures. When a certain second friction structure is abraded due to long-term friction with the first friction structure, so that sufficient friction force is not enough provided, the position of the first friction structure can be adjusted in the circumferential direction of the first transmission body, the first friction structure is matched with other unworn second friction structures, and friction transmission can be still achieved between the first friction structure and the unworn second friction structure.

Referring to figure 2, in one embodiment the second force transfer assembly 120 comprises a second force transfer body 122 and a connection ring 121. The second friction structure 1211 is arranged on the connection ring 121 and the connection ring 121 is connected to the second force transmission body 122 such that the second friction structure 1211 is indirectly arranged to the second force transmission body 122. By providing the second friction structure 1211 on the coupling ring 121 and connecting the coupling ring 121 to the second force transmitting body 122, it is facilitated to connect the second friction structure 1211 to the second force transmitting body 122.

Especially when a plurality of second friction structures 1211 are arranged at intervals in sequence in the circumferential direction of the second force transmitting body 122, the arrangement of the plurality of second friction structures 1211 is facilitated by the provision of the connection ring 121.

In other embodiments, the second friction structure may be directly provided to the second force transmitting body without the connecting ring.

Referring to fig. 2, in an embodiment, the first force transmission assembly 110 includes a first force transmission body 112 and an elastic member 113. The elastic member 113 is, for example, a coil spring, a leaf spring, or the like. The elastic members 113 are disposed corresponding to the first friction structures 111, for example, in a one-to-one correspondence. Two ends of the elastic member 113 are respectively connected to the first transmission body 112 and the corresponding first friction structure 111, and the elastic force of the elastic member 113 makes the corresponding first friction structure 111 abut against the second friction structure 1211.

Specifically, when the torque wrench 100 is used to threadedly connect the shaft assembly 11 of the ultrasonic surgical instrument 10 with the ultrasonic transducer 12, the shaft assembly 11 may be inserted through the first power transmission body 112 and secured to the first power transmission body 112. Since the two ends of the elastic member 113 are respectively connected to the first transmission body 112 and the corresponding first friction structure 111, the elastic force of the elastic member 113 makes the first friction structure 111 and the second friction structure 1211 tightly abut against each other, so that the first friction structure 111 and the corresponding second friction structure 1211 can realize good friction transmission, and a sufficient and appropriate assembly torque force can be provided for the shaft assembly 11 and the ultrasonic transducer 12.

Referring to fig. 2, the second force transmission assembly 120 includes a second force transmission body 122, and a second friction structure 1211 disposed on the second force transmission body 122 and located on a radial side of the second force transmission body 122. In particular in this embodiment, the second friction structure 1211 is located radially inside the second force transmission body 122. For example, the second friction structure 1211 may be arranged radially inside the connecting ring 121, the connecting ring 121 being arranged radially inside the second force transmission body 122, such that the second friction structure 1211 is located radially inside the second force transmission body 122.

The elastic force of the elastic member 113 is along the radial direction of the first force transmission body 112, so that the corresponding first friction structure 111 abuts against the second friction structure 1211 along the radial direction of the first force transmission body 112. In the present embodiment, the elastic member 113 and the first friction structure 111 are located at the inner side of the second friction structure 1211 in the radial direction of the second force transmission body 122, and the elastic member 113 and the first friction structure 111 are located at the outer side of the first force transmission body 112 in the radial direction, so that the elastic force applied by the elastic member 113 to the corresponding first friction structure 111 is directed to the outer side of the first force transmission body 112 in the radial direction, and the first friction structure 111 abuts against the second friction structure 1211. As shown in fig. 2, in a specific embodiment, an end of the elastic member 113 away from the first friction structure 111 may be connected to the loop 115, and the loop 115 is sleeved on the first force transmission body 112, so as to facilitate the connection between the elastic member 113 and the first force transmission body 112.

In other embodiments, when the first force transmission assembly surrounds the outside of the second force transmission assembly, it may be: the second friction structure is located on the radial outer side of the second force transmission body, the elastic piece and the first friction structure are located on the radial outer side of the second friction structure along the second force transmission body, the elastic piece and the first friction structure are located on the radial inner side of the first force transmission body, and the elastic piece applies elastic force to the corresponding first friction structure and faces the radial inner side of the first force transmission body, so that the first friction structure is abutted to the second friction structure.

Referring to fig. 2, in an embodiment, the first force transmission assembly 110 further includes a positioning element 114, the positioning element 114 is sleeved outside the first force transmission body 112, and a positioning hole 101 is disposed on a side wall of the positioning element 114. The first friction structure 111 is engaged with the positioning hole 101, so that the first friction structure 111 and the second friction structure 1211 can be reliably abutted, and the first friction structure 111 is prevented from being displaced along the circumferential direction of the first power transmission body 112. Specifically, in the present embodiment, the first friction structures 111 correspond to the positioning holes 101 one to one.

In other embodiments, when the number of the first friction structures is smaller than the number of the second friction structures, the number of the first friction structures may also be smaller than the number of the positioning holes, the positioning holes correspond to the second friction structures one to one, and the first friction structures may be selectively matched with any one of the positioning holes. When the first friction structure is matched with different positioning holes, the first friction structure can be matched with different second friction structures. For example, the number of the first friction structures is one, the number of the second friction structures is multiple, the second friction structures are sequentially arranged at intervals along the circumferential direction of the second force transmission body, and the number of the positioning holes is multiple, and the positioning holes are sequentially arranged at intervals along the first direction. When a certain second friction structure is abraded due to long-term friction with the first friction structure, so that sufficient friction force is not enough provided, at the moment, the position of the first friction structure can be adjusted through the circumferential direction of the first transmission body, the first friction structure is matched with other positioning holes (corresponding to other unworn second friction structures), the first friction structure is matched with other unworn second friction structures, and the first friction structure and the unworn second friction structure can still realize friction transmission.

In other embodiments, when the elastic element and the first friction structure are located at the radial inner side of the first force transmission body, the positioning element may also be disposed inside the first force transmission body in a penetrating manner.

Referring to fig. 1 and 2, in one embodiment, the torque wrench 100 further includes an auxiliary disassembly assembly 130. The auxiliary detaching assembly 130 has a first state and a second state that can be switched with each other, and in the first state, the auxiliary detaching assembly 130 locks the second force transmission assembly 120 and the first force transmission assembly 110, so that the second force transmission assembly 120 and the first force transmission assembly 110 rotate together. In the second state, the auxiliary dismounting assembly 130 unlocks the first force transmission assembly 110 and the second force transmission assembly 120, so that the first force transmission assembly 110 and the second force transmission assembly 120 realize friction transmission through the first friction structure 111 and the second friction structure 1211.

Specifically, when the shaft assembly 11 needs to be detached from the ultrasonic transducer 12, the auxiliary detaching assembly 130 is brought into the first state. Since the auxiliary detaching assembly 130 locks the second force transmission assembly 120 and the first force transmission assembly 110 in the first state, when the second force transmission assembly 120 or the first force transmission assembly 110 is rotated, the second force transmission assembly 120 and the first force transmission assembly 110 rotate together regardless of whether the torque applied to the first force transmission assembly 110 or the second force transmission assembly 120 exceeds the maximum static friction force between the first friction structure 111 and the second friction structure 1211, so that the shaft assembly 11 and the ultrasonic transducer 12 can be rotated relatively to be detached.

When it is desired to threadedly connect the shaft assembly 11 to the ultrasonic transducer 12, the auxiliary detachment assembly 130 is placed in the second state. Since the auxiliary detaching assembly 130 unlocks the first force transmission assembly 110 and the second force transmission assembly 120 in the second state, the first force transmission assembly 110 and the second force transmission assembly 120 realize friction transmission through the first friction structure 111 and the second friction structure 1211, so that the threaded connection between the shaft assembly 11 and the ultrasonic transducer 12 can be realized. More importantly, when the shaft assembly 11 is screwed to the ultrasonic transducer 12, the torque applied by continuously rotating the first force transmission assembly 110 or the second force transmission assembly 120 exceeds the maximum static friction force between the first friction structure 111 and the second friction structure 1211, so that the static friction between the first friction structure 111 and the second friction structure 1211 is converted into sliding friction, the first force transmission assembly 110 and the second force transmission assembly 120 rotate relatively, at this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure 111 and the second friction structure 1211 cannot drive the shaft assembly 11 to be screwed to the ultrasonic transducer 12, and it is convenient to limit the screwing force between the shaft assembly 11 and the ultrasonic transducer 12 from increasing continuously.

Referring to fig. 2, in one embodiment, the auxiliary detaching assembly 130 is connected to the second force transmission assembly 120 and rotates together with the second force transmission assembly 120. The auxiliary detaching assembly 130 has a first limiting structure 131, and the first force transferring assembly 110 has a first engaging structure 102. When the auxiliary dismounting device 130 is in the first state, the first limiting structure 131 is engaged with the first engaging structure 102, so that the first force transmission assembly 110 and the auxiliary dismounting device 130 rotate together (i.e. the second force transmission assembly 120 is locked with the first force transmission assembly 110). When the auxiliary detaching assembly 130 is in the second state, the first limiting structure 131 releases the first engaging structure 102, so that the auxiliary detaching assembly 130 releases the first force transmission assembly 110 (i.e., the second force transmission assembly 120 is unlocked from the first force transmission assembly 110), and thus, the first force transmission assembly 110 and the second force transmission assembly 120 can achieve friction transmission through the first friction structure 111 and the second friction structure 1211, so that when the shaft assembly 11 is screwed to the ultrasonic transducer 12, the torque force applied by continuously rotating the first force transmission assembly 110 or the second force transmission assembly 120 exceeds the maximum static friction force between the first friction structure 111 and the second friction structure 1211, so that the static friction between the first friction structure 111 and the second friction structure 1211 is converted into sliding friction, and the first force transmission assembly 110 and the second force transmission assembly 120 rotate relatively.

In other embodiments, it may also be: the auxiliary disassembling component is connected with the first force transmission component and rotates together with the first force transmission component. The auxiliary dismounting assembly is provided with a second limiting structure, and the second force transmission assembly is provided with a second matching structure. When the auxiliary dismounting component is in the first state, the second limiting structure is matched with the second matching structure, so that the second force transmission component and the auxiliary dismounting component can rotate together, and further the second force transmission component can rotate together with the first force transmission component (namely the second force transmission component is locked with the first force transmission component). When the auxiliary dismounting component is in the second state, the second limiting structure releases the second matching structure, so that the auxiliary dismounting component and the second force transmission component are unlocked (namely the second force transmission component and the first force transmission component are unlocked), therefore, when the shaft assembly is screwed with the ultrasonic transducer, the torque force applied by continuously rotating the first force transmission assembly or the second force transmission assembly exceeds the maximum static friction force between the first friction structure and the second friction structure, so that the static friction between the first friction structure and the second friction structure is converted into sliding friction, the first force transmission component and the second force transmission component rotate relatively, at the moment, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure and the second friction structure cannot drive the shaft assembly to be screwed relative to the ultrasonic transducer, so that the screwing force of the shaft assembly and the ultrasonic transducer cannot be increased.

Referring to fig. 2, in an embodiment, the auxiliary detaching assembly 130 has a first position and a second position shifted along the axial direction of the second force transmission assembly 120, the auxiliary detaching assembly 130 is in the first position when in the first state, and the auxiliary detaching assembly 130 is in the second position when in the second state. By moving the auxiliary dismounting component 130 between the first position and the second position, the auxiliary dismounting component 130 is switched between the first state and the second state, and the operation is convenient.

Referring to fig. 2, in an embodiment, the first limiting structure 131 is a first limiting protrusion, and the first matching structure 102 is a first limiting hole. When the auxiliary detaching assembly 130 moves between the first position and the second position, the first position-limiting protrusion is inserted into the first position-limiting hole or moved out of the first position-limiting hole. When the first limit protruding portion is inserted into the first limit hole, the auxiliary detaching assembly 130 and the first force transmission assembly 110 rotate together, so that the first force transmission assembly 110 and the second force transmission assembly 120 rotate together (i.e., the second force transmission assembly 120 is locked with the first force transmission assembly 110). When the first limit protrusion moves out of the first limit hole, the auxiliary detaching assembly 130 releases the first force transmission assembly 110 (i.e., the second force transmission assembly 120 is unlocked from the first force transmission assembly 110).

As shown in fig. 2, in the present embodiment, the auxiliary detaching assembly 130 includes an auxiliary detaching body 132. The auxiliary detaching body 132 is located at one end of the first power transmission assembly 110 in the axial direction. The first limiting structure 131 is disposed on the auxiliary detaching body 132 and located on a side of the auxiliary detaching body 132 close to the first power transmission assembly 110. The first engaging structure 102 can be disposed on the first force transmission body 112, and can also be disposed on the positioning member 114.

Optionally, in the present embodiment, the first mating structure 102 is located between the first force transmission body 112 and the positioning member 114 along a radial direction of the first force transmission assembly 110.

Optionally, the auxiliary detaching body 132 may be sleeved on the first force transmitting body 112, so as to facilitate the assembly and positioning of the auxiliary detaching body 132.

Further, a plurality of first limiting structures 131 may be sequentially disposed at intervals along the circumferential direction of the auxiliary dismounting body 132, a plurality of first matching structures 102 may be sequentially disposed at intervals along the circumferential direction of the first power transmission body 112, and the number of the first limiting structures 131 is the same as that of the first matching structures 102, so that each first limiting structure 131 can be matched with one first matching structure 102.

In other embodiments, the first limiting structure may be a first limiting hole, and the first matching structure may be a first limiting protrusion.

In other embodiments, the first limiting structure and the first matching structure may not be a limiting hole and a limiting convex portion, for example, they form a set of snap components.

Referring to fig. 2, in an embodiment, the auxiliary detaching assembly 130 has a second limiting structure 133, and the second force transmitting assembly 120 is provided with a second matching structure 103. The engagement of the second engagement structure 103 with the second stop structure 133 allows the secondary disconnect assembly 130 to be connected to the second force transfer assembly 120 and to be rotatable with the second force transfer assembly 120. Specifically, in the present embodiment, the second limiting structure 133 is a second limiting protrusion, and the second matching structure 103 is a second limiting groove. The second limit protrusion and the second limit groove are in inserting fit along the axial direction of the second force transmission component 120, so that the cooperation of the second limit protrusion and the second limit groove enables the auxiliary dismounting component 130 and the second force transmission component 120 to rotate together.

It should be noted that, because the second limit protrusion and the second limit groove are inserted and matched along the axial direction of the second force transmission assembly 120, when the second limit protrusion moves in the direction of being inserted into or removed from the second limit groove, the auxiliary detachment assembly 130 can move between the first position and the second position along the axial direction of the second force transmission assembly 120, so as to allow the first limit protrusion to be inserted into or removed from the first limit hole, and further, the auxiliary detachment assembly 130 and the first force transmission assembly 110 can rotate together or release the first force transmission assembly 110.

As shown in fig. 2, in the present embodiment, the auxiliary detaching assembly 130 includes an auxiliary detaching body 132. The auxiliary detaching body 132 is located at one end of the first power transmission assembly 110 in the axial direction. The second limiting structure 133 is disposed on the auxiliary detaching body 132 and located on a radial outer side of the auxiliary detaching body 132.

Further, a plurality of second limiting structures 133 may be sequentially disposed at intervals in the circumferential direction of the auxiliary detachment body 132, a plurality of second matching structures 103 may be sequentially disposed at intervals in the circumferential direction of the second force transmission body 122, and the number of the second limiting structures 133 is the same as that of the second matching structures 103, so that each second limiting structure 133 may be matched with one second matching structure 103.

In other embodiments, the second limiting structure may be a second limiting groove, and the second matching structure may be a second limiting convex portion.

In other embodiments, the second limiting structure and the second matching structure may not be a limiting groove and a limiting protrusion, for example, they form a set of snap components.

Referring to fig. 2, in an embodiment, the second limiting groove includes a first groove section 1031 and a second groove section 1032 which are communicated with each other. When the auxiliary detaching assembly 130 is in the first position (the first state), the second limit protrusion is engaged with the first slot section 1031 and engaged with the second slot section 1032. The first slot section 1031 is located at one side of the second slot section 1032 in the insertion direction of the second limit projection into the second limit slot, and therefore, the second limit projection may be sequentially inserted into the second slot section 1032 and the first slot section 1031, thereby assisting the detachment assembly 130 to reach the first position (the first state). Because in the first state, the second limit protruding portion is inserted into the second groove section 1032 and the first groove section 1031, the second force transmission assembly 120 and the auxiliary detachment assembly 130 are reliably matched to rotate together, and the shaft assembly 11 and the ultrasonic transducer 12 are conveniently detached.

When the auxiliary detaching assembly 130 is switched from the first position (the first state) to the second position (the second state), the second limit protrusion is moved out of the first slot section 1031 and is matched with the second slot section 1032. That is, when the auxiliary disconnect assembly 130 is in the second position (second state), i.e., when the torque wrench 100 is used to threadably connect the shaft assembly 11 to the ultrasonic transducer 12, the second limit tab co-rotates with the second force transfer assembly 110 within the second channel section 1032.

As shown in fig. 2, a dimension of the first slot section 1031 in the first direction is smaller than a dimension of the second slot section 1032 in the first direction, so that the first slot wall 1031a of the first slot section 1031 and the second slot wall 1032a of the second slot section 1032 can be dislocated in the first direction, a step surface 1033 is formed at a connection portion of the first slot wall 1031a and the second slot wall 1032a, and the step surface 1033 faces the second limit protrusion. The first direction is the circumferential direction of the second force transfer assembly 120.

When the torque wrench 100 is used to connect the shaft assembly 11 and the ultrasonic transducer 12 by a screw, the second force transmission assembly 120 and the first force transmission assembly 110 rotate together through the friction transmission of the first friction structure 111 and the second friction structure 1211, and the second limit protrusion is located on the second groove section 1032, so that the second groove wall 1032a can push the second limit protrusion along the first direction, thereby driving the auxiliary detachment assembly 130 to rotate together. When the second groove wall 1032a pushes the second limit protrusion along the first direction, the second limit protrusion is at least partially located in an area surrounded by the second groove wall 1032a and the step surface 1033, so that the second limit protrusion is blocked by the step surface 1033, and thus the second limit protrusion is prevented from being displaced into the first groove section 1031, and the auxiliary detachment assembly 130 is prevented from being switched from the second position (the second state) to the first position (the first state). When the torque wrench 100 is used to screw the shaft assembly 11 and the ultrasonic transducer 12, the auxiliary detaching assembly 130 can be prevented from being switched from the second position (the second state) to the first position (the first state), so that the first force transmission assembly 110 and the second force transmission assembly 120 can be prevented from being locked, friction transmission between the first force transmission assembly 110 and the second force transmission assembly 120 through the first friction structure 111 and the second friction structure 1211 can be ensured, and the screwing force between the shaft assembly 11 and the ultrasonic transducer 12 can be limited within a proper range through relative rotation between the first force transmission assembly 110 and the second force transmission assembly 120.

If it is desired to displace the auxiliary detachment assembly 130 from the second position (second state) to the first position (first state), the auxiliary detachment assembly 130 may be manually rotated in the first direction relative to the second force transfer assembly 120 such that the second limit projection is aligned with and inserted into the first slot section 1031.

As shown in fig. 2, in the present embodiment, the shape of the second limit projection is adapted to the shape of the second limit groove. Of course, the shape of the second limit protrusion and the second limit groove may be different.

As shown in fig. 1, an embodiment of the present application further provides an ultrasonic surgical instrument 10, which includes a shaft assembly 11, an ultrasonic transducer 12 and the torque wrench 100 of any one of the above embodiments, wherein the shaft assembly 11 is disposed through the first force transmission assembly 110 and the second force transmission assembly 120, the shaft assembly 11 is fixedly connected to the first force transmission assembly 110 or the second force transmission assembly 120, and the shaft assembly 11 is threadedly connected to the ultrasonic transducer 12.

In one embodiment, the ultrasonic surgical instrument 10 further includes a handle 13. The torque wrench 100 is mounted to the handle 13.

When the shaft assembly of the ultrasonic surgical instrument is in threaded connection with the ultrasonic transducer, the shaft assembly is fixedly connected with one of the first force transmission assembly and the second force transmission assembly. At the initial stage of threaded connection of the shaft assembly and the ultrasonic transducer, torsion is applied to the other one of the first force transmission assembly and the second force transmission assembly, so that the first force transmission assembly and the second force transmission assembly are driven to rotate together through friction transmission of the first friction structure and the second friction structure, and the shaft assembly and the ultrasonic transducer are driven to be screwed gradually. When the screwing force of the shaft assembly and the ultrasonic transducer reaches the assembling torque force of the shaft assembly and the ultrasonic transducer (namely, the screwing force is equal to the maximum static friction force between the first friction structure and the second friction structure), the shaft assembly and the ultrasonic transducer are screwed, the shaft assembly does not rotate, and one of the first force transmission assembly and the second force transmission assembly fixedly connected with the shaft assembly does not rotate. And the other of the first force transmission assembly and the second force transmission assembly is rotated continuously, so that the first force transmission assembly and the second force transmission assembly rotate relatively. At this time, the sliding friction force (less than or equal to the maximum static friction force) between the first friction structure and the second friction structure cannot drive the shaft assembly to be continuously screwed with respect to the ultrasonic transducer 12, that is, the screwing force between the shaft assembly and the ultrasonic transducer cannot be continuously increased, so that the screwing force between the shaft assembly and the ultrasonic transducer can be limited within a proper range.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A torque wrench, comprising a first force transfer assembly (110) and a second force transfer assembly (120), one of the first force transfer assembly (110) and the second force transfer assembly (120) being enclosed outside the other; the first force transfer assembly (110) has at least one first friction structure (111) and the second force transfer assembly (120) has at least one second friction structure (1211), the first force transfer assembly (110) and the second force transfer assembly (120) being in friction transmission via the first friction structure (111) and the second friction structure (1211).

2. The torque wrench of claim 1,

the second force transmission assembly (120) comprises a second force transmission body (122), the second friction structures (1211) are arranged on the second force transmission body (122), and the second friction structures (1211) are sequentially arranged at intervals along the circumferential direction of the second force transmission body (122);

and/or, the first force transmission assembly (110) comprises a first force transmission body (112), the first friction structures (111) are arranged on the first force transmission body (112), and the first friction structures (111) are sequentially arranged at intervals along the circumferential direction of the first force transmission body (112).

3. The torque wrench according to claim 1 or 2, wherein the first force transmission assembly (110) comprises a first force transmission body (112) and an elastic member (113), the elastic member (113) is arranged corresponding to the first friction structure (111), and two ends of the elastic member (113) are connected to the first force transmission body (112) and the corresponding first friction structure (111), respectively.

4. The torque wrench as claimed in claim 3, wherein the first force transfer assembly (110) further comprises: the positioning piece (114) penetrates through or is sleeved on the first force transmission body (112), and a positioning hole (101) matched with the first friction structure (111) is formed in the side wall of the positioning piece (114).

5. The torque wrench according to claim 1, further comprising an auxiliary disconnect assembly (130), the auxiliary disconnect assembly (130) having a first state and a second state switchable with respect to each other, in the first state the auxiliary disconnect assembly (130) locking the second force transmission assembly (120) with the first force transmission assembly (110); in the second state, the auxiliary disconnect assembly (130) unlocks the first force transfer assembly (110) from the second force transfer assembly (120).

6. The torque wrench according to claim 5, wherein the auxiliary disconnect assembly (130) is connected to the second force transfer assembly (120) and co-rotates with the second force transfer assembly (120); the auxiliary disassembling assembly (130) is provided with a first limiting structure (131), and the first force transmission assembly (110) is provided with a first matching structure (102); when the auxiliary dismounting assembly (130) is in the first state, the first limiting structure (131) is matched with the first matching structure (102), so that the first force transmission assembly (110) and the auxiliary dismounting assembly (130) rotate together; when the auxiliary dismounting assembly (130) is in the second state, the first limiting structure (131) releases the first matching structure (102).

7. The torque wrench according to claim 5, wherein the first limiting structure (131) and the first fitting structure (102) are a first limiting protrusion and a first limiting hole, and the first limiting protrusion and the first limiting hole are in plug-fit engagement along the axial direction of the second force transmission assembly (120).

8. The torque wrench according to any one of claims 6 or 7, wherein one of the auxiliary removal assembly (130) and the second force transmission assembly (120) is provided with a second limit protrusion, and the other one of the auxiliary removal assembly and the second force transmission assembly is provided with a second limit groove, and the second limit protrusion and the second limit groove are in plug-fit engagement along the axial direction of the second force transmission assembly (120).

9. The torque wrench according to claim 8, wherein the second limiting groove comprises a first groove section (1031) and a second groove section (1032) which are communicated with each other, the first groove section (1031) is located on one side of the second groove section (1032) in a direction in which the second limiting protrusion is inserted into the second limiting groove, the width of the second groove section (1032) is greater than the width of the first groove section (1031) in the first direction, wherein the first direction is a circumferential direction of the second force transmission assembly (120); when the auxiliary dismounting component (130) is in the first state, a second limit protruding part is matched with the first groove section (1031) and matched with the second groove section (1032), and when the auxiliary dismounting component (130) is switched from the first state to the second state, the second limit protruding part moves out of the first groove section (1031) and is matched with the second groove section (1032).

10. An ultrasonic surgical instrument, characterized by comprising a shaft assembly (11), an ultrasonic transducer (12) and the torque wrench of any one of claims 1-9, wherein the shaft assembly (11) is arranged through the first force transmission assembly (110) and the second force transmission assembly (120), the shaft assembly (11) is fixedly connected with the first force transmission assembly (110) or the second force transmission assembly (120), and the shaft assembly (11) is in threaded connection with the ultrasonic transducer (12).