Cutting device for preparing arc-shaped crack of suture line along crack surface

Abstract

The invention discloses a cutting device for preparing an arc-shaped crack of a suture line along a crack surface, and belongs to the technical field of suture line cutting. The pre-tightening mechanism is arranged on the base and is used for pre-tightening the suture line; the cutting mechanism comprises an arc-shaped plate arranged on the base, a moving lower platform is arranged between the arc-shaped plate and the suture line, a cutting blade right opposite to the suture line is arranged on the moving lower platform, a plurality of first rolling wheels are rotationally connected to the moving lower platform, and a rolling driving mechanism is connected to the moving lower platform; the rolling driving mechanism is used for driving the first roller to roll along the arc-shaped wall surface of the arc-shaped plate; and the radian adjusting mechanism is arranged on the base, and the radian adjusting mechanism is connected with the arc-shaped plate and used for adjusting the radian of the arc-shaped plate. According to the method, stable preparation of the arc-shaped crack barb structures with different radians can be achieved, the situation that the maximum value of the stress intensity factor appears at the middle point of the crack front edge line is avoided, and the anchoring force of the barb suture line can be effectively improved on the premise that the breaking strength of the barb suture line is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of suture cutting, and in particular to a cutting device for preparing arc-shaped cracks along a crack surface of a suture. Background Art

[0002] Sutures currently used in clinical practice are mainly divided into two categories: traditional sutures and new barbed sutures. Traditional sutures dominate open surgery due to their ease of operation and high suturing efficiency, but they have the risk of limited intracavitary surgical space and loose knots. Barbed sutures achieve knot-free suturing through an integrated barbed structure, which can shorten surgical time and is particularly suitable for minimally invasive procedures such as laparoscopy. The distributed anchoring force generated by the barb array makes stress transmission more uniform; however, the barb structure significantly affects the breaking strength of the barbed suture. Finite element simulations have shown that the stress intensity factor at the midpoint of the crack front line of the barb structure is the largest, and cracks are most likely to extend at this location.

[0003] To this end, a cutting device for preparing arc-shaped cracks along the crack surface of the suture line is proposed. Summary of the Invention

[0004] The object of the present invention is to provide a cutting device for preparing arc-shaped cracks along the crack surface of a suture, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a cutting device for preparing arc-shaped cracks along the crack surface of a suture, comprising:

[0006] base;

[0007] A pre-tightening mechanism is provided on the base, and is used to pre-tighten the suture;

[0008] The cutting mechanism includes a curved plate provided on the base, wherein the center line of the curved plate is parallel to the suture line, a movable lower platform is provided between the curved plate and the suture line, a cutting blade facing the suture line is provided on the movable lower platform, a plurality of first rollers are rotatably connected to the movable lower platform, and a rolling drive mechanism is connected to the movable lower platform, wherein the rolling drive mechanism is used to drive the first rollers to roll along the curved wall surface of the curved plate;

[0009] The curvature adjustment mechanism is arranged on the base, and the curvature adjustment mechanism is connected to the curved plate for adjusting the curvature of the curved plate.

[0010] Preferably, the rolling drive mechanism includes a moving upper platform, the curved plate is located between the moving upper platform and the moving lower platform, and tension springs are fixed to the four corners of the moving upper platform and the moving lower platform respectively. A plurality of second rollers are rotatably connected to the moving upper platform, and the second rollers are in rolling contact with the curved wall surface of the curved plate away from the first rollers. A rolling drive component for driving the second rollers to roll is provided on the moving upper platform.

[0011] Preferably, a plurality of arc-shaped rolling grooves are provided on the arc-shaped wall surface of the arc-shaped plate close to the second roller, the curvature of the arc-shaped rolling groove is consistent with the curvature of the arc-shaped plate, and the second roller extends into the arc-shaped rolling groove and is in rolling contact with the arc-shaped rolling groove.

[0012] Preferably, the rolling drive assembly includes a moving platform motor fixedly connected to the moving upper platform, a first synchronous pulley is fixedly connected to the output shaft of the moving platform motor, a second synchronous pulley is coaxially fixedly connected to one of the second rollers, a through groove is opened on the moving upper platform, the first synchronous pulley and the second synchronous pulley are connected by a synchronous belt transmission, and the synchronous belt passes through the through groove.

[0013] Preferably, a cylinder is fixedly connected to one end of the movable lower platform close to the suture line, and a piston rod of the cylinder is arranged perpendicular to the suture line and fixed to the cutting blade.

[0014] Preferably, a cylindrical platform is provided on the base, and the suture line is placed on the cylindrical platform, and the suture line is located between the cutting blade and the cylindrical platform.

[0015] Preferably, the curvature adjustment mechanism includes two support plates, which are respectively fixed to the two ends of the arc plate, and the arc plate has elastic deformation. A spacing adjustment component is provided on the base, and the spacing adjustment component is used to adjust the spacing between the two support plates.

[0016] Preferably, the spacing adjustment assembly includes a stretching motor fixedly connected to the base, a ball screw fixedly connected to the output shaft of the stretching motor, the ball screw having two threaded sections, and the two threaded sections have opposite rotation directions, and slides are respectively threadedly sleeved on the two threaded sections of the ball screw, the slides are in sliding contact with the base, and the two support plates are respectively fixed to the two slides.

[0017] Preferably, the pre-tightening mechanism includes two pre-tightening blocks and two dovetail groove sliders, and the two pre-tightening blocks and the two dovetail groove sliders are respectively located on both sides of the suture line, and a first linear moving component and a second linear moving component are provided on the base, and the first linear moving component and the second linear moving component are respectively used to drive the pre-tightening block and the dovetail groove slider to move linearly, thereby realizing pre-tightening of the suture line.

[0018] Preferably, a third linear moving component is also provided on the base, and an arc contact and a grating scale component are connected to the third linear moving component. The arc contact is used to press the suture thread for pre-tightening, and the grating scale component is used to read the deformation of the suture thread under pre-tightening, and a force sensor is fixed on the arc contact.

[0019] The present invention discloses the following technical effects: the arc plate is adjusted to a suitable arc by a curvature adjustment mechanism, the suture is pre-tightened by a pre-tightening mechanism, and the first roller is driven to roll along the arc wall of the arc plate by a rolling drive mechanism, thereby driving the cutting blade to perform arc cutting of the suture along the arc movement path of the first roller. This application can achieve the stable preparation of arc-shaped crack barb structures, avoid the maximum value of the stress intensity factor appearing at the midpoint of the crack front line, and effectively improve the anchoring force of the barbed suture without affecting its breaking strength; at the same time, by changing the curvature of the arc plate, arc-shaped crack barb structures with different curvatures can be prepared. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0021] Figure 1 is an axonometric drawing of the present invention;

[0022] Figure 2 A top view of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the pre-tightening mechanism of the present invention;

[0024] Figure 4 for Figure 1 A partial enlarged view of middle A.

[0025] In the figure: 1. Base; 2. Stretching motor; 3. Bearing support; 4. Ball screw; 5. Support plate; 6. Reinforcement rib; 7. Stretching spring; 8. Second roller; 9. Suture line; 10. Motion platform motor; 11. First synchronous pulley; 12. Synchronous belt; 13. Motion upper platform; 14. Motion lower platform; 15. Slide; 16. Cutting support table; 17. Cylindrical table; 18. Cutting blade; 19. Cylinder; 20. Arc plate; 101. Grating scale assembly; 102. Arc contact; 103. Fixed plate; 104. Horizontal moving table; 105. Force sensor; 106. Dovetail groove slider; 107. Dovetail groove base; 108. Rotating shaft; 109. Preload motor; 110. Reducer; 111. Preload block; 112. Ball screw module. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1-Figure 4 The present invention provides a cutting device for preparing arc-shaped cracks along the crack surface of a suture thread, comprising:

[0029] Base 1;

[0030] A pre-tightening mechanism is provided on the base 1 and is used to pre-tighten the suture thread 9;

[0031] The cutting mechanism includes a curved plate 20 provided on the base 1, the center line of the curved plate 20 is parallel to the suture line 9, a movable lower platform 14 is provided between the curved plate 20 and the suture line 9, a cutting blade 18 is provided on the movable lower platform 14 and is directly opposite to the suture line 9, a plurality of first rollers are rotatably connected to the movable lower platform 14, and a rolling drive mechanism is connected to the movable lower platform 14, and the rolling drive mechanism is used to drive the first rollers to roll along the curved wall surface of the curved plate 20;

[0032] The curvature adjustment mechanism is provided on the base 1 , and is connected to the curved plate 20 for adjusting the curvature of the curved plate 20 .

[0033] In some optional embodiments, the rolling drive mechanism includes a moving upper platform 13, an arc plate 20 is located between the moving upper platform 13 and the moving lower platform 14, and tension springs 7 are respectively fixed at the four corners of the moving upper platform 13 and the moving lower platform 14. A plurality of second rollers 8 are rotatably connected to the moving upper platform 13, and the second rollers 8 are in rolling contact with the arc wall of the arc plate 20 away from the first rollers. A rolling drive component for driving the second rollers 8 to roll is provided on the moving upper platform 13.

[0034] In some optional embodiments, a plurality of arcuate rolling grooves are provided on the arcuate wall surface of the arcuate plate 20 close to the second roller 8, the curvature of the arcuate rolling groove is consistent with the curvature of the arcuate plate 20, and the second roller 8 extends into the arcuate rolling groove and is in rolling contact with the arcuate rolling groove.

[0035] The second roller 8 is limited by the arc-shaped rolling groove, thereby realizing the positioning of the cutting blade 18 in the axial direction of the suture line 9.

[0036] In some optional embodiments, the rolling drive assembly includes a moving platform motor 10 fixedly connected to the moving upper platform 13, a first synchronous pulley 11 is fixedly connected to the output shaft of the moving platform motor 10, a second synchronous pulley is coaxially fixed to one of the second rollers 8, a through groove is opened on the moving upper platform 13, the first synchronous pulley 11 and the second synchronous pulley are connected by a synchronous belt 12, and the synchronous belt 12 passes through the through groove.

[0037] The displacement of the cutting blade 18 is precisely controlled by the synchronous belt 12 and the first synchronous pulley 11 to avoid cumulative errors.

[0038] Furthermore, the plurality of second rollers 8 are provided in one-to-one correspondence with the plurality of first rollers. Specifically, there are four second rollers 8 and four first rollers respectively, which are arranged in a rectangular array.

[0039] When in use, the first synchronous pulley 11 is driven forward or reverse by the motion platform motor 10, thereby driving the second synchronous pulley to rotate, and then the second roller 8 connected to it rolls in the arc rolling groove, and then all the second rollers 8 and the first rollers roll, and the rolling path is consistent with the curve of the arc plate 20, so that the cutting blade 18 cuts along the arc path.

[0040] Because the upper and lower platforms 13 and 14 are connected by a tension spring 7, the flexible cutting of arc-shaped cracks in the barbed structure is achieved through the rotation of the tension spring 7 and the rollers. Furthermore, the tension spring 7 and the first and second rollers are symmetrically arranged between the upper and lower platforms 13 and 14, balancing the bending moment between the components and increasing the overall stability of the cutting device.

[0041] In some optional embodiments, a cylinder 19 is fixedly connected to one end of the moving lower platform 14 close to the suture line 9 , and a piston rod of the cylinder 19 is perpendicularly arranged to the suture line 9 and fixedly connected to the cutting blade 18 .

[0042] During cutting, the cutting blade 18 is driven to move up and down by the cylinder 19 to adjust the cutting depth of the cutting blade 18 .

[0043] In some optional embodiments, a cylindrical platform 17 is provided on the base 1 , and the suture thread 9 is placed on the cylindrical platform 17 , and the suture thread 9 is located between the cutting blade 18 and the cylindrical platform 17 .

[0044] In some optional embodiments, the curvature adjustment mechanism includes two support plates 5, which are respectively fixed to the two ends of the arc plate 20, and the arc plate 20 has an elastic deformation amount. A spacing adjustment component is provided on the base 1, and the spacing adjustment component is used to adjust the spacing between the two support plates 5.

[0045] In some optional embodiments, the spacing adjustment assembly includes a stretching motor 2 fixedly connected to the base 1, and a ball screw 4 is fixedly connected to the output shaft of the stretching motor 2. The ball screw 4 has two threaded sections, and the rotation directions of the two threaded sections are opposite. The two threaded sections of the ball screw 4 are respectively threaded with slides 15, and the slide 15 is in sliding contact with the base 1. The two support plates 5 are respectively fixed to the two slides 15.

[0046] Both ends of the ball screw 4 pass through the bearing support 3 to achieve stable rotation. This application uses a stretching motor 2 to achieve synchronous reverse driving of the two support plates 5, and can achieve various curvatures of the arc plate 20.

[0047] Furthermore, a reinforcing rib 6 is fixed to the side surface of the support plate 5, which can simplify the structure while ensuring that the overall cutting device has high bending rigidity through the reinforcing rib structure.

[0048] In some optional embodiments, the pre-tightening mechanism includes two pre-tightening blocks 111 and two dovetail groove sliders 106, and the two pre-tightening blocks 111 and the two dovetail groove sliders 106 are respectively located on both sides of the suture line 9, and a first linear moving component and a second linear moving component are provided on the base 1. The first linear moving component and the second linear moving component are respectively used to drive the pre-tightening blocks 111 and the dovetail groove sliders 106 to move linearly, thereby achieving pre-tightening of the suture line 9.

[0049] Specifically, the two pre-tightening blocks 111 are located on both sides of the arc plate 20 , one dovetail slot slider 106 is located between one of the pre-tightening blocks 111 and the arc plate 20 , and the other dovetail slot slider 106 is located between the other pre-tightening block 111 and the arc plate 20 .

[0050] Furthermore, the first linear motion component includes a pre-tightening motor 109 fixedly connected to the base 1, and a ball screw module 112 is provided at the output end of the pre-tightening motor 109. The pre-tightening motor 109 and the ball screw module 112 are connected through a reducer 110. The pre-tightening block 111 is fixedly connected to the slide of the ball screw module 112. The slide of the ball screw module 112 is in sliding contact with the base. A curved guide groove is provided on the pre-tightening block 111, and the suture line 9 is located in the curved guide groove.

[0051] A cutting support platform 16 is fixed to the base, with a ball screw 4 located below the cutting support platform 16, which is located between the two support plates 5, and a cylindrical platform 17 fixed to the top of the cutting support platform 16. The second linear motion component includes a dovetail base 107 fixed to the cutting support platform 16, a dovetail slider 106 slidably connected to the dovetail base 107, and a rotating shaft 108 threadedly connected to the dovetail slider 106, with the end of the rotating shaft 108 abutting against the dovetail base 107. When movement is required, the rotating shaft 108 is rotated to move it away from the dovetail base 107, releasing the limit, and then the dovetail slider 106 is moved linearly. After reaching the appropriate position, the rotating shaft 108 is tightened. An arc-shaped limit groove is provided at the end of the dovetail slider 106, and the suture thread 9 is located within the arc-shaped limit groove.

[0052] In some optional embodiments, a third linear moving component is further provided on the base 1, and an arc contact 102 and a grating scale component 101 are connected to the third linear moving component. The arc contact 102 is used to press against the suture line 9 for pre-tightening, and the grating scale component 101 is used to read the deformation of the suture line 9 under pre-tightening. A force sensor 105 is fixedly connected to the arc contact 102.

[0053] Furthermore, the third linear motion component includes a horizontal motion platform 104 arranged on the cutting support platform 16. The horizontal motion platform 104 controls the arc contact 102 to contact the pre-tightened suture 9 through the clamp fixing plate 103, obtains the pre-tightening force with the help of the force sensor 105, and reads the deformation of the pre-tightened suture 9 through the grating scale component 101.

[0054] When the present invention is in use, the output shaft of the stretching motor 2 drives the ball screw 4 to rotate. Since the threads on both sides of the ball screw 4 rotate in opposite directions, the slide 15 is controlled to perform linear motion in opposite directions on the base 1. Since the slide 15 drives the support plate 5 to move, the displacement between the support plates 5 changes, which in turn causes the curvature of the arc plate 20 to change. The motion platform motor 10 on the upper motion platform 13 drives the first synchronous pulley 11 to rotate. The first synchronous pulley 11 controls the second roller 8 and the first roller to roll back and forth on the arc plate 20 through the synchronous belt 12. The cylinder 19 on the lower motion platform 14 controls the feed displacement of the cutting blade 18, so that the cutting blade 18 can cut the suture line 9. Driven by the motion platform motor 10 and the second roller 8 and the first roller, the cutting device can move back and forth along the arc plate 20, driving the cutting blade 18 to achieve arc cutting on the suture line 9.

[0055] Beneficial effects:

[0056] 1. The present invention can prepare arc-shaped cracks in a barbed structure, avoiding the maximum value of the stress intensity factor appearing at the midpoint of the crack front line, and effectively improving the anchoring force of the barbed suture without affecting the breaking strength of the barbed suture.

[0057] 2. While simplifying the structure of the support plate 5, the reinforcing rib 6 structure is used to ensure that the entire cutting device has high bending rigidity.

[0058] 3. The ball screw 4 has bidirectional threads on both sides, and a stretching motor 2 is used to control the support plates 5 on both sides to move in opposite directions, so that various curvatures of the arc plate 20 can be achieved.

[0059] 4. The upper moving platform 13 and the lower moving platform 14 are connected by the tension spring 7, and the flexible cutting of the arc crack of the barb structure is achieved through the rolling pair of the arc plate 20 and the roller.

[0060] 5. The tension spring 7 and the first and second rollers are symmetrically arranged between the upper movable platform 13 and the lower movable platform 14 to balance the bending moments between the components and increase the overall stability of the cutting device.

[0061] 6. An arc-shaped sliding groove is provided on the arc plate 20, which cooperates with the cylindrical platform 17 to realize the positioning of the cutting blade 18 in the axial direction of the suture line 9.

[0062] 7. The displacement of the cutting platform is precisely controlled by the synchronous pulley and the synchronous belt 12 to avoid cumulative errors.

[0063] 8 The pre-tightening block 111 and the dovetail groove slider 106 movement device ensure that the suture thread is tightened before cutting, thereby increasing the cutting accuracy.

[0064] 9. The force sensor 105 and the grating scale assembly 101 are used to detect the preload force and deformation of the suture in real time to avoid excessive tension causing an undesirable barbed cutting structure.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A cutting device for preparing arc-shaped cracks along the crack surface of a suture line, characterized in that: include: Base (1); A pre-tightening mechanism is provided on the base (1), and is used to pre-tighten the suture thread (9); The cutting mechanism comprises an arc-shaped plate (20) arranged on the base (1), the center line of the arc-shaped plate (20) is parallel to the suture line (9), a moving lower platform (14) is arranged between the arc-shaped plate (20) and the suture line (9), a cutting blade (18) facing the suture line (9) is arranged on the moving lower platform (14), a plurality of first rollers are rotatably connected to the moving lower platform (14), and a rolling drive mechanism is connected to the moving lower platform (14), and the rolling drive mechanism is used to drive the first rollers to roll along the arc-shaped wall surface of the arc-shaped plate (20); An radian adjustment mechanism is provided on the base (1), and the radian adjustment mechanism is connected to the arc plate (20) and is used to adjust the radian of the arc plate (20).

2. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 1, characterized in that: The rolling drive mechanism includes a moving upper platform (13), the arc plate (20) is located between the moving upper platform (13) and the moving lower platform (14), and the four corners of the moving upper platform (13) and the moving lower platform (14) are respectively fixed with tension springs (7), and the moving upper platform (13) is rotatably connected with a plurality of second rollers (8), and the second rollers (8) are in rolling contact with the arc wall of the arc plate (20) away from the first rollers, and a rolling drive component for driving the second rollers (8) to roll is provided on the moving upper platform (13).

3. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 2, characterized in that: A plurality of arcuate rolling grooves are provided on the arcuate wall surface of the arcuate plate (20) close to the second roller (8), the curvature of the arcuate rolling grooves being consistent with the curvature of the arcuate plate (20), and the second roller (8) extends into the arcuate rolling grooves and is in rolling contact with the arcuate rolling grooves.

4. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 2, characterized in that: The rolling drive assembly includes a motion platform motor (10) fixedly connected to the motion upper platform (13); a first synchronous pulley (11) is fixedly connected to the output shaft of the motion platform motor (10); a second synchronous pulley is coaxially fixedly connected to one of the second rollers (8); a through groove is provided on the motion upper platform (13); the first synchronous pulley (11) and the second synchronous pulley are connected by a synchronous belt (12); and the synchronous belt (12) passes through the through groove.

5. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 1, characterized in that: A cylinder (19) is fixedly connected to one end of the moving lower platform (14) close to the suture line (9), and a piston rod of the cylinder (19) is arranged perpendicular to the suture line (9) and fixedly connected to the cutting blade (18).

6. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 5, characterized in that: A cylindrical platform (17) is provided on the base (1), and a suture line (9) is placed on the cylindrical platform (17), and the suture line (9) is located between the cutting blade (18) and the cylindrical platform (17).

7. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 1, characterized in that: The radian adjustment mechanism comprises two support plates (5), the two support plates (5) are respectively fixed to the two ends of the arc plate (20), the arc plate (20) has an elastic deformation amount, and a spacing adjustment component is provided on the base (1), and the spacing adjustment component is used to adjust the spacing between the two support plates (5).

8. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 7, characterized in that: The spacing adjustment component includes a stretching motor (2) fixedly connected to the base (1), a ball screw (4) fixedly connected to the output shaft of the stretching motor (2), the ball screw (4) having two threaded sections, and the two threaded sections have opposite rotation directions, and slides (15) are respectively threadedly sleeved on the two threaded sections of the ball screw (4), the slides (15) are in sliding contact with the base (1), and the two support plates (5) are respectively fixedly connected to the two slides (15).

9. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 1, characterized in that: The pre-tightening mechanism comprises two pre-tightening blocks (111) and two dovetail groove sliders (106), the two pre-tightening blocks (111) and the two dovetail groove sliders (106) are respectively located on both sides of the suture (9), and a first linear moving component and a second linear moving component are provided on the base (1), the first linear moving component and the second linear moving component are respectively used to drive the pre-tightening blocks (111) and the dovetail groove sliders (106) to move linearly, thereby realizing pre-tightening of the suture (9).

10. The cutting device for preparing arc-shaped cracks along the crack surface of a suture according to claim 9, characterized in that: A third linear motion component is also provided on the base (1), and an arc-shaped contact (102) and a grating scale component (101) are connected to the third linear motion component. The arc-shaped contact (102) is used to press against the suture thread (9) for pre-tightening, and the grating scale component (101) is used to read the deformation of the suture thread (9) under pre-tightening. A force sensor (105) is fixedly connected to the arc-shaped contact (102).

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