Jaw assembly

Abstract

The jaw assembly comprises a first jaw piece, a second jaw piece and a cutting tool, the first jaw piece and the second jaw piece are connected in a pivoted mode and can move relatively to be opened or closed, a guide groove is formed in the first jaw piece in the axial direction of the first jaw piece, and a feeding groove is formed in the second jaw piece in the axial direction of the second jaw piece. The cutting tool is provided with a first pivoting piece and a second pivoting piece, one end of the cutting tool is arranged in the feeding groove, when the jaw assembly is closed, the other end of the cutting tool can be located in the guide groove, the first pivoting piece is arranged on the groove wall of the guide groove in a penetrating mode, and the second pivoting piece is arranged on the groove wall of the feeding groove in a penetrating mode. And the first pivoting piece and the second pivoting piece can respectively roll on the groove wall of the guide groove and the groove wall of the feed groove along the axial direction of the second jaw piece. According to the utility model, the problems of low cutting efficiency and poor cutting effect caused by overlarge frictional resistance when the cutting tool moves in the guide groove and the feed groove are solved.

Description

Technical Field

[0001] This utility model relates to the field of medical device manufacturing, and in particular to a jaw assembly. Background Technology

[0002] As a commonly used instrument in minimally invasive surgery, the stapler is designed to achieve tissue separation and anastomosis through a smaller surgical incision, thereby significantly shortening postoperative recovery time and reducing the occurrence of complications.

[0003] In practical applications, the jaw assembly of the stapler needs to be positioned and precisely and securely locked according to the characteristics of the surgery; this is a crucial step in ensuring surgical success. Once locked, the cutting blade moves along the guide groove on the first jaw and the feed groove on the second jaw, precisely cutting the tissue to be cut. However, existing technology faces a significant challenge: when the cutting blade moves within the guide groove and feed groove, excessive frictional resistance often leads to reduced cutting efficiency and unsatisfactory cutting results.

[0004] Specifically, excessive frictional resistance not only increases the difficulty of moving the cutting tool, but may also cause incomplete cutting or uneven cut surfaces, thereby prolonging the operation time and increasing patient pain and risks. In addition, the heat generated by friction may cause unnecessary thermal damage to surrounding tissues, further affecting the surgical outcome. Utility Model Content

[0005] The purpose of this utility model is to provide a jaw assembly to solve the problem that the cutting efficiency is reduced and the cutting effect is poor when the cutting tool moves in the guide groove and the feed groove due to excessive frictional resistance.

[0006] To achieve the above-mentioned objectives of this utility model, one embodiment of this utility model provides a jaw assembly, including a first jaw member, a second jaw member, and a cutting tool. The first jaw member and the second jaw member are pivotally connected and can move relative to each other to open or close. The first jaw member has a guide groove along its axial direction, and the second jaw member has a tool-feeding groove along its axial direction. The cutting tool has a first pivot member and a second pivot member. One end of the cutting tool is located in the tool-feeding groove. When the jaw assembly is closed, the other end of the cutting tool can be located in the guide groove. The first pivot member passes through the groove wall of the guide groove, and the second pivot member passes through the groove wall of the tool-feeding groove. The first pivot member and the second pivot member can roll along the axial direction of the second jaw member on the groove wall of the guide groove and the groove wall of the tool-feeding groove, respectively.

[0007] As a further improvement of this utility model embodiment, the guide groove has two side walls, which are arranged opposite to each other in a direction perpendicular to the axial direction of the first jaw member. Two first limiting grooves are symmetrically provided on the two side walls. The first limiting grooves extend in a direction parallel to the axial direction of the first jaw member. When the jaw assembly is closed, the first pivot member passes through the cutting tool and has two ends protruding beyond the cutting tool. The two ends pass through the two first limiting grooves respectively.

[0008] As a further improvement of the present invention, the first pivot member includes two first needle rollers arranged in parallel, the two first needle rollers passing through the cutting tool, and the two ends of each first needle roller protruding beyond the cutting tool and respectively passing through the two first limiting grooves.

[0009] As a further improvement of the present invention, the first roller needle includes a first intermediate cylindrical section and two first rolling elements connected to its two ends. The cutting tool is provided with a first mounting hole through it in the transverse direction. The first intermediate cylindrical section passes through the first mounting hole, and the two first rolling elements pass through the two first limiting grooves respectively. The orthographic projection of the first rolling element on one side of the transverse direction of the cutting tool is located outside the orthographic projection of the first mounting hole on that side.

[0010] As a further improvement of this utility model embodiment, the cutting tool is provided with a first boss on both sides in the transverse direction. The first boss protrudes into the first limiting groove. The first rolling element is disposed between the first boss and the lower side wall of the first limiting groove. The first boss is provided with a first arc-shaped concave surface on the side facing the first rolling element. The first rolling element is supported between the first arc-shaped concave surface and the lower side wall of the first limiting groove and rolls in contact with both of them. The first intermediate cylindrical section does not contact the hole wall of the first mounting hole.

[0011] As a further improvement of this utility model embodiment, the tool groove has two side walls, which are arranged opposite to each other in a direction perpendicular to the axial direction of the second jaw member. Two second limiting grooves are symmetrically provided on the two side walls. The second limiting grooves extend in a direction parallel to the axial direction of the second jaw member. The second pivot member passes through the cutting tool and has two ends protruding beyond the cutting tool. The two ends pass through the two second limiting grooves respectively.

[0012] As a further improvement of this utility model embodiment, the second pivot member includes two parallel second needle rollers, which are inserted through the cutting tool, and the two ends of each second needle roller protrude beyond the cutting tool and are respectively inserted into the two second limiting grooves.

[0013] As a further improvement of the present invention, the second roller needle includes a second intermediate cylindrical section and two second rolling elements connected to its two ends. The cutting tool is provided with a second mounting hole through its transverse direction. The second intermediate cylindrical section passes through the second mounting hole. The two second rolling elements are respectively passed through the two second limiting grooves. The orthographic projection of the second rolling element on one side of the transverse direction of the cutting tool is located outside the orthographic projection of the second mounting hole on that side.

[0014] As a further improvement of this utility model embodiment, the cutting tool is provided with a second protrusion on both sides in the transverse direction. The second protrusion protrudes into the second limiting groove. The second rolling member is located between the second protrusion and the upper sidewall of the groove where the second limiting groove is located. The second protrusion is provided with a second arc-shaped concave surface on one side facing the second rolling member. The second rolling member is supported between the second arc-shaped concave surface and the lower sidewall of the groove where the second limiting groove is located and rolls in contact with both of them. The second rolling member does not contact the hole wall of the second mounting hole.

[0015] As a further improvement of this utility model embodiment, the cutting tool includes an I-beam mounting bracket, the I-beam mounting bracket includes two crossbeams and a connecting beam connecting the two crossbeams, the two crossbeams include a first crossbeam located in a guide groove when the jaw assembly is closed and a second crossbeam located in a tool feed groove, the two first bosses are disposed on two sides of the first crossbeam in the transverse direction, and the two second bosses are disposed on two sides of the second crossbeam in the transverse direction.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The first pivot member and the second pivot member can roll along the axial direction of the second jaw member on the groove wall of the guide groove and the groove wall of the feed groove, thereby reducing the frictional resistance of the cutting tool when it moves in the guide groove and the feed groove, thereby improving the cutting efficiency and the cutting effect when cutting the tissue to be cut. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a jaw assembly provided in one embodiment of the present invention;

[0019] Figure 2 for Figure 1A half-section structural diagram of the middle jaw assembly;

[0020] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0021] Figure 4 for Figure 2 Schematic diagram of the structure of the medium cutting tool;

[0022] Figure 5 for Figure 4 Exploded view of the structure of a medium-sized cutting tool;

[0023] Figure 6 for Figure 5 A schematic diagram of the structure of the first needle roller;

[0024] Figure 7 for Figure 5 A schematic diagram of the structure of the second needle roller;

[0025] Figure 8 for Figure 3 Enlarged view at point M;

[0026] Figure 9 Bit Figure 3 Enlarged view at point N;

[0027] Figure 10 This is a schematic diagram of the pusher rod pushing the cutting tool forward in this utility model;

[0028] Figure 11 This is a schematic diagram of the pusher rod driving the cutting tool backward in this utility model;

[0029] Figure 12 This is a schematic diagram of the structure of the first needle roller and the second needle roller in another embodiment of the present invention.

[0030] The above description of the figures includes the following reference numerals:

[0031] 1. First jaw assembly;

[0032] 11. Guide groove;

[0033] 111. First limiting groove;

[0034] 2. Second jaw assembly;

[0035] 21. Tool groove;

[0036] 211. Second limiting groove;

[0037] 3. Cutting tools;

[0038] 31. First pivot component;

[0039] 311. First needle roller;

[0040] 3111, First intermediate cylindrical segment;

[0041] 3112. First rolling element;

[0042] 31121. First rolling cylinder;

[0043] 31122, First rolling ball;

[0044] 32. Second pivot component;

[0045] 321. Second needle roller;

[0046] 3211. Second intermediate cylindrical segment;

[0047] 3212, Second rolling element;

[0048] 32121, Second rolling cylinder;

[0049] 32122, Second rolling ball;

[0050] 33. First boss;

[0051] 331. First arc-shaped concave surface;

[0052] 34. Second protrusion;

[0053] 341. The second arc-shaped concave surface;

[0054] 351. First crossbeam

[0055] 352. Second crossbeam;

[0056] 3511, First mounting hole;

[0057] 3521, Second mounting hole;

[0058] 36. Connecting beam;

[0059] 4. Pusher rod. Detailed Implementation

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0061] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0062] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0063] To address the problem in existing technologies where excessive frictional resistance leads to reduced cutting efficiency and poor cutting results when the cutting tool 3 moves within the guide groove 11 and the feed groove 21, this invention provides a jaw assembly.

[0064] like Figure 1-11 As shown, this utility model provides a jaw assembly, including a first jaw member 1, a second jaw member 2, and a cutting tool 3. The first jaw member 1 and the second jaw member 2 are pivotally connected and can move relative to each other to open or close. The first jaw member 1 is provided with a guide groove 11 along its axial direction, and the second jaw member 2 is provided with a tool feed groove 21 along its axial direction. The cutting tool 3 is provided with a first pivot member 31 and a second pivot member 32. One end of the cutting tool 3 is located in the tool feed groove 21. When the jaw assembly is closed, the other end of the cutting tool 3 can be located in the guide groove 11. The first pivot member 31 passes through the groove wall of the guide groove 11, and the second pivot member 32 passes through the groove wall of the tool feed groove 21. The first pivot member 31 and the second pivot member 32 can roll along the axial direction of the second jaw member 2 on the groove wall of the guide groove 11 and the groove wall of the tool feed groove 21, respectively.

[0065] Understandably, when the first jaw 1 and the second jaw 2 pivotally close, reference... Figure 3 As shown, the first pivot member 31 passes through the wall of the guide groove 11, and the second pivot member 32 passes through the wall of the feed groove 21. Therefore, the positions of the first jaw member 1 and the second jaw member 2 relative to the cutting tool 3 can be defined in a direction perpendicular to the axial direction of the second jaw member 2. Corresponding to... Figure 3 In this way, the positions of the first jaw 1 and the second jaw 2 in the vertical direction relative to the cutting tool 3 can be defined, so that when the first jaw 1 and the second jaw 2 are closed to clamp the tissue, they can have a better clamping effect.

[0066] Generally speaking, in this utility model, one end of the first jaw member 1 is pivotally connected to one end of the second jaw member 2. When the two move relative to each other to close, that is, the jaw assembly is in a closed state.

[0067] It should be noted that in this invention, the jaw assembly has a distal end that is away from the operator (i.e., close to the surgical end) and a proximal end that is close to the operator (i.e., away from the surgical end), as shown in the reference. Figure 1 As shown in the figure, the left side represents the proximal end, and the right side represents the distal end. In this figure, the proximal end of the first jaw member 1 is pivotally connected to the proximal end of the second jaw member 2. The axial direction of the first jaw member 1 is the direction extending from its proximal end toward its distal end, and the axial direction of the second jaw member 2 is also the direction extending from its proximal end toward its distal end.

[0068] In the above configuration, when the jaw assembly is closed, the first pivot 31 and the second pivot 32 can roll along the axial direction of the second jaw 2 on the groove wall of the guide groove 11 and the groove wall of the feed groove 21, respectively. This reduces the frictional resistance of the cutting tool 3 when it moves in the guide groove 11 and the feed groove 21, thereby improving the cutting efficiency and the cutting effect when cutting the tissue to be cut.

[0069] The technical solution will be further explained below with reference to the embodiments and accompanying drawings. Example 1

[0070] In this embodiment, the guide groove 11 is further designed with specific structural features. The guide groove 11 has two sidewalls, which are arranged opposite each other in a direction perpendicular to the axial direction of the first jaw member 1. Two first limiting grooves 111 are symmetrically provided on the two sidewalls. The first limiting grooves 111 extend in a direction parallel to the axial direction of the first jaw member 1. The first pivot member 31 passes through the cutting tool 3 and has two ends protruding beyond the cutting tool 3.

[0071] Furthermore, when the jaw assembly is closed, the two ends are respectively inserted into a corresponding first limiting groove 111 and can roll on the groove wall of the first limiting groove 111. This structural arrangement restricts the movement trajectory of the first pivot member 31, enabling it to perform precise pivoting movement along a predetermined path. This ensures the stable guidance and effective cutting of the cutting tool 3 in the guide groove 11, and also greatly reduces the frictional force generated between the first pivot member 31 and the groove wall of the cutting tool 3 when it moves in the tool path groove 21.

[0072] Understandably, refer to Figure 2-3 As shown, the first limiting groove 111 can limit the position of the first pivot member 31 in the vertical direction.

[0073] Further, refer to Figure 4-5 As shown, the first pivot member 31 is specifically constructed including two parallel first needle rollers 311. This design aims to reduce friction and improve rotational flexibility. Both first needle rollers 311 pass through the cutting tool 3, and both ends of each needle roller protrude beyond the cutting tool 3. This arrangement allows the needle rollers to be stably connected to the external structure.

[0074] Specifically, refer to Figure 3 In the optimal display, the two ends of each first roller 311 are respectively inserted into the two first limiting grooves 111 mentioned above. This structural arrangement not only restricts the movement trajectory of the first pivot 31, but also ensures its stability and accuracy during the movement process, thereby improving the reliability of the overall mechanical structure and the cutting effect.

[0075] The first needle roller 311 is mounted on the cutting tool 3 and can pivot relative to the cutting tool 3, thereby ensuring that when the cutting tool 3 moves along the guide groove 11, the first needle roller 311 can roll on the groove side wall below the first limiting groove 111, thereby minimizing the frictional resistance when the cutting tool 3 moves along the guide groove 11.

[0076] Furthermore, when both first needle rollers 311 roll on the side wall below the first limiting groove 111, it can be understood that the side wall below the first limiting groove 111 limits the position of the first needle rollers 311 in the vertical direction, thereby limiting the position of the cutting tool 3 in the vertical direction through the first needle rollers 311.

[0077] It should be noted that the two parallel first rollers 311 define a unique plane that is parallel to the horizontal plane, thereby ensuring that the upper end of the cutting tool 3 moves in the horizontal direction and preventing the cutting tool 3 from vibrating when it moves axially along the guide groove 11.

[0078] Further, refer to Figure 6 As shown, the first needle roller 311 specifically includes a first intermediate cylindrical section 3111 and two first rolling elements 3112 connected to both ends of the first intermediate cylindrical section 3111. This design makes the first needle roller 311 both structurally stable and flexible.

[0079] Furthermore, the cutting tool 3 is provided with a first mounting hole 3511, the first intermediate cylindrical section 3111 is provided in the first mounting hole 3511, and the two first rolling elements 3112 are respectively provided in the two first limiting grooves 111, wherein the orthographic projection of the first rolling element 3112 on one side of the cutting tool 3 in the lateral direction is outside the orthographic projection of the first mounting hole 3511 on that side.

[0080] It should be noted that the transverse direction of the cutting tool 3 refers to the direction perpendicular to the two opposite sidewalls of the guide groove 11 when one end of the cutting tool 3 is located in the guide groove 11; that is, the direction perpendicular to the two opposite sidewalls of the guide groove 21 when the other end of the cutting tool 3 is located in the feed groove 21.

[0081] With this configuration, the first intermediate cylindrical section 3111 and the first rolling elements 3112 at both ends form a wheel-like structure. The two first rolling elements 3112 are equivalent to two wheels rolling on the side wall of the first limiting groove 111 located below, which greatly reduces the friction during movement. The main function of the first intermediate cylindrical section 3111 is to cooperate with the cutting tool 3.

[0082] In this invention, the orthographic projection of the first rolling element 3112 on one side of the cutting tool 3 in the lateral direction is outside the orthographic projection of the first mounting hole 3511 on that side. This arrangement allows the two first rolling elements 3112 to limit the position of the first needle roller 311 relative to the cutting tool 3 in the lateral direction, preventing it from deviating during movement.

[0083] This embodiment is a preferred embodiment, and reference is made thereto. Figure 3 , Figure 5 and Figure 8 As shown, the cutting tool 3 has a first protrusion 33 cleverly provided on both sides in the horizontal direction. Each of the two first protrusions 33 protrudes into a corresponding first limiting groove 111, which plays a key supporting and positioning role.

[0084] In particular, the first rolling element 3112 is carefully arranged between the first boss 33 and the first limiting groove 111 located on the lower sidewall of the groove. This arrangement not only ensures the stable installation of the needle roller, but also allows it to rotate freely within the defined space.

[0085] To further optimize the structure, refer to Figure 5 As shown in Figure 8, a first arc-shaped recessed surface 331 is specially designed on the side of the first boss 33 facing the first rolling element 3112. The first rolling element 3112 is supported between the first arc-shaped recessed surface 331 and the lower sidewall of the first limiting groove 111 and rolls in contact with both. This structural arrangement improves the overall stability, effectively reduces friction and wear during rotation, thereby extending the service life of the mechanical structure and ensuring the accuracy and reliability of the cutting tool 3 during operation. The first arc-shaped recessed surface 331 and the lower sidewall of the first limiting groove 111 confine the first rolling element 3112 between them.

[0086] Understandably, the cutting tool 3 is movably connected to the groove wall of the first limiting groove 111 through the first intermediate cylindrical section 3111 and two first rolling elements 3112, thereby precisely limiting the upper part of the cutting tool 3.

[0087] During the specific movement process, the first needle roller 311 can roll into contact with the first arc-shaped concave surface 331 and the groove sidewall of the first limiting groove 111 located below. These three form a bearing-like mechanism, which minimizes the frictional resistance of the first needle roller 311 during the movement process.

[0088] Preferably, still refer to Figure 8 As shown, in this embodiment, the first intermediate cylindrical segment 3111 does not contact the wall of the first mounting hole 3511.

[0089] With this configuration, the first intermediate cylindrical section 3111 serves only to connect the two first rolling elements 3112 at its two ends, thereby limiting the position of the two first rolling elements 3112 in the radial direction of the guide groove 11 (the radial direction being perpendicular to the two opposite sidewalls of the guide groove 11), thus preventing the cutting tool 3 from sliding in the radial direction of the guide groove 11 during its movement. Simultaneously, it prevents friction between the first intermediate cylindrical section 3111 and the wall of the first mounting hole 3511.

[0090] Understandably, the two first rolling elements 3112 serve to support the cutting tool 3. The first rolling elements 3112 are the main force-bearing parts, and the two first rolling elements 3112, the first arc-shaped concave surface 331, and the groove sidewall of the first limiting groove 111 located on the lower side all have rolling friction, thereby greatly reducing the friction of the cutting tool 3 during movement.

[0091] It should be noted that in this embodiment, in the design of the first needle roller 311, the first rolling element 3112 is usually set as the first rolling cylinder 31121.

[0092] Next, refer to Figure 2-3 As shown, the tool feed groove 21 has two sidewalls, which are arranged opposite each other in a direction perpendicular to the axial direction of the second jaw member 2. Two second limiting grooves 211 are symmetrically arranged on these two sidewalls. The second limiting grooves 211 extend in a direction parallel to the axial direction of the second jaw member 2.

[0093] Specifically, the second pivot member 32 passes through the cutting tool 3 and has two ends protruding beyond the cutting tool 3. These two ends are cleverly inserted into the two second limiting grooves 211. This structural arrangement not only restricts the movement of the second pivot member 32 in its radial direction, but also allows it to have a certain amount of room for movement in the axial direction of the second pivot axis, thereby ensuring the stability and flexibility of the mechanical structure.

[0094] Further, refer to Figure 4-5As shown, the specific structure of the second pivot member 32 includes two parallel second needle rollers 321. This design not only ensures the stability of the structure, but also facilitates the pivoting action.

[0095] Two second rollers 321 are cleverly threaded onto the cutting tool 3, with both ends of each roller protruding beyond the cutting tool 3. This arrangement allows the rollers to form an effective connection with other components outside the cutting tool 3.

[0096] Typically, the cutting tool 3 is provided with a mounting hole through which the second roller 321 passes. This mounting hole is usually arranged radially along the cutting tool 3 and extends through the cutting tool 3.

[0097] The second needle roller 321 is mounted on the cutting tool 3 and can pivot relative to the cutting tool 3, thereby ensuring that when the cutting tool 3 moves along the feed groove 21, the second needle roller 321 can roll on the groove side wall above the second limiting groove 211, thereby minimizing the frictional resistance when the cutting tool 3 moves along the feed groove 21.

[0098] Still for reference Figure 3 In the best-case scenario, when both second needle rollers 321 move on the groove sidewall above the second limiting groove 211, it can be understood that the groove sidewall above the second limiting groove 211 limits the position of the second needle rollers 321 in the vertical direction, thereby limiting the position of the cutting tool 3 in the vertical direction through the second needle rollers 321.

[0099] As described above, the first needle roller 311 engages with the first limiting groove 111, and the second needle roller 321 engages with the second limiting groove 211, thereby limiting the vertical position of the cutting tool 3 relative to the first jaw 1 and the second jaw 2 during its movement. Conversely, when the cutting tool 3 moves axially along the feed groove 21, it can limit the vertical position of the first jaw 1 and the second jaw 2, thus ensuring that the first jaw 1 and the second jaw 2 maintain a good clamping state and that the tissue to be cut is clamped by both of them.

[0100] Understandably, the two parallel second rollers 321 define a unique plane that is parallel to the horizontal plane, thereby ensuring that the lower end of the cutting tool 3 moves in the horizontal direction and preventing the cutting tool 3 from vibrating when it moves axially along the feed groove 21.

[0101] Further, refer to Figure 7As shown, the second needle roller 321 has a carefully designed structure, which mainly includes a second intermediate cylindrical section 3211 and two second rolling elements 3212 connected to both ends of the second intermediate cylindrical section 3211. This three-section design not only ensures a stable connection between the needle roller and the cutting tool 3, but also facilitates the installation and pivoting of the needle roller in the second limiting groove 211.

[0102] Furthermore, the cutting tool 3 is provided with a second mounting hole 3521, the second intermediate cylindrical section 3211 is provided in the second mounting hole 3521, and the two second rolling elements 3212 are respectively provided in the two second limiting grooves 211, wherein the orthographic projection of the second rolling element 3212 on one side of the cutting tool 3 in the lateral direction is outside the orthographic projection of the second mounting hole 3521 on that side.

[0103] With this configuration, the second intermediate cylindrical section 3211 and the second rolling elements 3212 at both ends form a wheel-like structure, combined with Figure 9 As shown, the two second rolling elements 3212 are equivalent to two wheels moving on the side wall of the second limiting groove 211 located above, which greatly reduces the friction during movement. The main function of the second intermediate cylindrical section 3211 is to cooperate with the cutting tool 3.

[0104] Furthermore, the orthographic projection of the second rolling element 3212 on one side of the cutting tool 3 in the lateral direction is outside the orthographic projection of the second mounting hole 3521 on that side. This arrangement allows the two second rolling elements 3212 to define the position of the second needle roller 321 in the lateral direction of the cutting tool 3, preventing it from deviating during movement.

[0105] It should be noted that, in this embodiment, in the design of the second needle roller 321, the second rolling element 3212 is usually set as the second rolling cylinder 32121.

[0106] Further, refer to Figure 3 , Figure 5 and Figure 9 As shown, the cutting tool 3 has a second protrusion 34 cleverly provided on both sides in the horizontal direction. Each second protrusion 34 protrudes into a corresponding second limiting groove 211, which facilitates installation and positioning.

[0107] In particular, the second rolling element 3212 is carefully arranged between the second boss 34 and the second limiting groove 211 located on the upper groove sidewall. This arrangement ensures both the compactness of the structure and the stability of the installation.

[0108] To further optimize the structure and improve performance, refer to Figure 5 , Figure 9As shown, a second arc-shaped recessed surface 341 is specially provided on the side of the second boss 34 facing the second rolling element 3212. This design of the second arc-shaped recessed surface is ingenious. Furthermore, the second rolling element 3212 is supported between the second arc-shaped recessed surface 341 and the upper sidewall of the second limiting groove 211, and rolls in contact with both. This structural design not only improves the overall strength of the cutting tool 3 but also effectively reduces vibration and wear that may occur during operation, further extending its service life.

[0109] The second arc-shaped recessed surface 341 and the second limiting groove 211, located on the upper groove sidewall, confine the second rolling element 3212 between them, thereby precisely limiting the lower part of the cutting tool 3. Understandably, the cutting tool 3 is connected to the groove wall of the feed groove 21 via the second intermediate cylindrical section 3211 and the two second rolling elements 3212.

[0110] In conjunction with the above, the first arc-shaped concave surface 331 and the first limiting groove 111, located on the lower sidewall of the groove, confine the first rolling element 3112 between them, thereby precisely limiting the upper part of the cutting tool 3. Therefore, it can be seen that during the axial movement of the cutting tool 3 along the feed groove 21, its vertical position is precisely defined. According to the principle of action and reaction, the cutting tool 3 also precisely defines the vertical positions of the first jaw member 1 and the second jaw member 2. As the cutting tool 3 moves axially along the feed groove 21, the first jaw member 1 and the second jaw member 2 are in a good clamping state, allowing them to better clamp the tissue to be cut.

[0111] Understandably, the second needle roller 321 can roll into contact with the second arc-shaped recessed surface 341 and the groove sidewall of the second limiting groove 211 located above. These three components form a bearing-like mechanism, which minimizes the frictional resistance of the second needle roller 321 during movement.

[0112] Preferably, still refer to Figure 9 As shown, in this embodiment, the second intermediate cylindrical section 3211 does not contact the wall of the second mounting hole 3521.

[0113] With this configuration, the second intermediate cylindrical section 3211 serves only to connect the two second rolling elements 3212 at its two ends, thereby limiting the position of the two second rolling elements 3212 in the radial direction of the feed groove 21 (the radial direction being perpendicular to the two opposite sidewalls of the feed groove 21), preventing the cutting tool 3 from sliding in the radial direction of the feed groove 21 during its movement. Furthermore, it prevents friction between the second intermediate cylindrical section 3211 and the wall of the second mounting hole 3521.

[0114] Understandably, the two second rolling elements 3212 are responsible for supporting the cutting tool 3. The two second rolling elements 3212 are the main force-bearing parts. The two second rolling elements 3212 and the second arc-shaped concave surface 341 and the upper side wall of the second limiting groove 211 are all subject to rolling friction, which greatly reduces the friction of the cutting tool 3 during movement.

[0115] Furthermore, still referencing Figure 5 As best viewed, the cutting tool 3 is primarily composed of an I-beam mounting frame, which ingeniously incorporates two crossbeams and a connecting beam 36 connecting the two crossbeams. Specifically, the two crossbeams include a first crossbeam 351 located in the guide groove 11 when the jaw assembly is closed, and a second crossbeam 352 located in the feed groove 21. The two are securely connected by the connecting beam 36, forming a compact and high-strength whole. The first mounting hole 3511 is typically located on the first crossbeam 351, and the second mounting hole 3521 is typically located on the second crossbeam 352. Generally, the cutting tool 3 also includes a cutting blade, which is typically positioned between the two crossbeams.

[0116] In terms of specific layout, the two first protrusions 33 are carefully positioned on the two sides of the first crossbeam 351 in the transverse direction, providing excellent support and positioning. Correspondingly, the two second protrusions 34 are positioned on the two sides of the second crossbeam 352 in the transverse direction, working together with the first protrusions 33 to ensure the stability and accuracy of the cutting tool 3 during installation and use. This design not only facilitates the quick installation and disassembly of the cutting tool 3, but also effectively improves its efficiency and reliability in cutting operations.

[0117] In this invention, the jaw assembly further includes a pusher rod 4 for moving the cutting tool 3. The pusher rod 4 can be fixedly connected to the cutting tool 3 or detachably connected. The pusher rod 4 can push the cutting tool 3 forward or move it backward.

[0118] Figure 10-11 The process of the pusher bar 4 cooperating with the cutting tool 3 is shown. Specifically, Figure 10 The diagram illustrates the process by which the pusher bar 4 propels the cutting tool 3 forward, i.e., it moves to the right in the diagram. During this process, the two upper first needle rollers 311 move clockwise, while the two lower second needle rollers 321 pivot counterclockwise.

[0119] Specifically Figure 11 The figure shows the process of the cutting tool 3 retracting. In this figure, the cutting tool 3 retracts to the left. During this process, the two first rollers 311 located above move counterclockwise, while the two second rollers 321 located below pivot clockwise. Example 2

[0120] In this embodiment, reference Figure 12 As shown, Figure 12 A schematic diagram of the structure of the first needle roller 311 and the second needle roller 321 is shown.

[0121] The main difference between this embodiment and embodiment 1 is that in the design of the first needle roller 311, the first rolling element 3112 is usually set as the first rolling ball 31122, while in the design of the second needle roller 321, the second rolling element 3212 is usually set as the second rolling ball 32122.

[0122] In this embodiment, the arrangement of the first rolling ball 31122 and the second rolling ball 32122 is more conducive to reducing frictional resistance when the first needle roller 311 and the second needle roller 321 roll on the groove wall of the guide groove 11 and the groove wall of the feed groove 21.

[0123] The remaining working principles are largely the same as in Example 1, which has been described in detail in Example 1 and will not be repeated here.

[0124] In summary, the embodiments of this utility model achieve the following technical effects:

[0125] First, the first pivot member 31 and the second pivot member 32 can roll along the axial direction of the second jaw member 2, thereby reducing the frictional resistance of the cutting tool 3 when it moves in the guide groove 11 and the feed groove 21, thereby improving the cutting efficiency when cutting the tissue to be cut and improving the cutting effect.

[0126] Second, the first arc-shaped concave surface 331 cooperates with the lower sidewall of the first limiting groove 111, which can effectively limit the position of the first roller 311 in the vertical direction. The second arc-shaped concave surface 341 cooperates with the upper sidewall of the second limiting groove 211, which can effectively limit the position of the second roller 321 in the vertical direction. The cutting tool 3 cooperates with the first roller 311 and the second roller 321, which limits the position of the first jaw member 1 and the second jaw member 2. When the cutting tool 3 moves along the axial direction of the cutting groove 21, the first jaw member 1 and the second jaw member 2 can effectively clamp the tissue to be cut.

[0127] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0128] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0129] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0130] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A jaw assembly, comprising a first jaw member, a second jaw member, and a cutting tool, wherein the first jaw member and the second jaw member are pivotally connected and can move relative to each other to open or close, characterized in that, The first jaw assembly has a guide groove along its axial direction, and the second jaw assembly has a tool feed groove along its axial direction. The cutting tool has a first pivot and a second pivot. One end of the cutting tool is located in the tool feed groove. When the jaw assembly is closed, the other end of the cutting tool can be located in the guide groove. The first pivot is inserted through the groove wall of the guide groove, and the second pivot is inserted through the groove wall of the tool feed groove. The first pivot and the second pivot can roll along the axial direction of the second jaw assembly on the groove wall of the guide groove and the groove wall of the tool feed groove, respectively.

2. The jaw assembly according to claim 1, characterized in that, The guide groove has two sidewalls, which are arranged opposite each other in a direction perpendicular to the axial direction of the first jaw member. Two first limiting grooves are symmetrically provided on the two sidewalls. The first limiting grooves extend in a direction parallel to the axial direction of the first jaw member. When the jaw assembly is closed, the first pivot member passes through the cutting tool and has two ends protruding beyond the cutting tool. The two ends pass through the two first limiting grooves respectively.

3. The jaw assembly according to claim 2, characterized in that, The first pivot member includes two first needle rollers arranged in parallel. The two first needle rollers pass through the cutting tool, and the two ends of each first needle roller protrude beyond the cutting tool and pass through the two first limiting grooves respectively.

4. The jaw assembly according to claim 3, characterized in that, The first needle roller includes a first intermediate cylindrical section and two first rolling elements connected to its two ends. The cutting tool has a first mounting hole extending through it in the transverse direction. The first intermediate cylindrical section passes through the first mounting hole, and the two first rolling elements pass through the two first limiting grooves respectively. The orthographic projection of the first rolling element on one side of the transverse direction of the cutting tool is located outside the orthographic projection of the first mounting hole on that side.

5. The jaw assembly according to claim 4, characterized in that, The cutting tool has a first protrusion on both sides in the transverse direction. The first protrusion protrudes into the first limiting groove. The first rolling element is disposed between the first protrusion and the lower side wall of the first limiting groove. The first protrusion has a first arc-shaped concave surface on the side facing the first rolling element. The first rolling element is supported between the first arc-shaped concave surface and the lower side wall of the first limiting groove and rolls in contact with both. The first intermediate cylindrical section does not contact the hole wall of the first mounting hole.

6. The jaw assembly according to claim 5, characterized in that, The feed groove has two sidewalls, which are arranged opposite each other in a direction perpendicular to the axial direction of the second jaw member. Two second limiting grooves are symmetrically provided on the two sidewalls. The second limiting grooves extend in a direction parallel to the axial direction of the second jaw member. The second pivot member passes through the cutting tool and has two ends protruding beyond the cutting tool. The two ends pass through the two second limiting grooves respectively.

7. The jaw assembly according to claim 6, characterized in that, The second pivot member includes two parallel second needle rollers, which are inserted through the cutting tool, and the two ends of each second needle roller protrude beyond the cutting tool and are respectively inserted into the two second limiting grooves.

8. The jaw assembly according to claim 7, characterized in that, The second needle roller includes a second intermediate cylindrical section and two second rolling elements connected to its two ends. The cutting tool has a second mounting hole extending through it laterally. The second intermediate cylindrical section passes through the second mounting hole, and the two second rolling elements pass through the two second limiting grooves respectively. The orthographic projection of the second rolling element on one side of the cutting tool in the lateral direction is outside the orthographic projection of the second mounting hole on that side.

9. The jaw assembly according to claim 8, characterized in that, The cutting tool has a second protrusion on both sides in the transverse direction. The second protrusion protrudes into the second limiting groove. The second rolling element is located between the second protrusion and the upper side wall of the second limiting groove. The second protrusion has a second arc-shaped concave surface on one side facing the second rolling element. The second rolling element is supported between the second arc-shaped concave surface and the lower side wall of the second limiting groove and rolls in contact with both of them. The second rolling element does not contact the hole wall of the second mounting hole.

10. The jaw assembly according to claim 9, characterized in that, The cutting tool includes an I-beam mounting bracket, which includes two crossbeams and a connecting beam connecting the two crossbeams. The two crossbeams include a first crossbeam located in a guide groove when the jaw assembly is closed and a second crossbeam located in a tool feed groove. Two first bosses are disposed on two sides of the first crossbeam in the transverse direction, and two second bosses are disposed on two sides of the second crossbeam in the transverse direction.

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