Bending assembly based on double flexible sheets and anastomat
The design of the bending component with double flexible sheets solves the problem of insufficient bending angle of the laparoscopic stapler, realizes the flexible bending of the stapler device and reduces the firing force, and improves the practicality and feel of the laparoscopic stapler.
Patent Information
- Application Number
- CN202422185880.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The bending angle of the existing laparoscopic stapler is too small, resulting in poor practicality, and the firing force of the single-joint bending component is increased, affecting the hand feel.
A bending assembly based on double flexible sheets is adopted, including a bending joint assembly, a first flexible sheet and a second flexible sheet. By engaging the driving rack and the auxiliary rack and utilizing the linkage of the bending gear and the joint, the flexible bending of the nail magazine device is achieved. The flexible sheet is hidden inside the joint for transmission, reducing the fitting tolerance of the connecting rod type multi-stage shaft hole connection.
The flexible bending of the stapler structure is achieved, the transmission space requirement is reduced, and the fitting tolerance of the connecting rod type multi-stage shaft hole connection is reduced. The structure is simple, the cost is low, and the process is easy to implement, thereby improving the practicality and feel of the stapler.
Smart Images
Figure CN223336154U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to a bending assembly used for a surgical instrument stapler. Background Art
[0002] Laparoscopic staplers have seen rapid growth in recent years, occupying a crucial position in minimally invasive surgery. However, due to limitations in technology and materials, the stapler cartridges of early laparoscopic staplers were not designed to bend, limiting their ability to cut and suture along a straight line. With the advancement of materials and technology, laparoscopic staplers with bendable cartridges have been developed, and now occupy a majority of the market share. However, the performance of laparoscopic staplers on the market varies significantly, with the bendable angles of the cartridges varying widely. Excessive bending angles increase the firing force, while too small bending angles reduce their practicality.
[0003] Existing solutions for laparoscopic staplers with flexible cartridges typically use a single-joint bending assembly controlled by a connecting rod. This connecting rod connects the cartridge to the other side, and pushing the connecting rod from one side causes the cartridge to bend. While this single-joint bending assembly is simple, it also results in a large bending curvature, which increases the firing force and affects the firing feel, presenting unavoidable technical drawbacks.
[0004] How to solve the technical problem of larger bending angles in the existing technology is a technical problem that urgently needs to be solved. Utility Model Content
[0005] The technical problem to be solved by the utility model is to solve the technical problem in the prior art that the bending angle is too small and the practicality is not strong.
[0006] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:
[0007] A bending assembly based on double flexible sheets comprises a bending joint assembly, a first flexible sheet (713) and a second flexible sheet (7713); the proximal end of the bending joint assembly is connected to a transmission base (701); the distal end of the bending joint assembly is connected to a nail magazine device (4); a driving rack (702) and a secondary rack (704) are respectively installed on the side walls of the transmission base (701); the distal end of the driving rack (702) is connected to the proximal end of the first flexible sheet (713); the first flexible sheet (713) passes through the transmission base (701) and the bending joint assembly and is connected to the rear end of the bending joint assembly; the distal end of the secondary rack (704) is connected to the proximal end of the second flexible sheet (7713); the second flexible sheet (7713) passes through the transmission base (701) and the bending joint assembly and is connected to the rear end of the bending joint assembly.
[0008] Furthermore, the first flexible sheet (713) and the second flexible sheet (7713) are respectively made of metal.
[0009] Furthermore, the bending joint assembly includes a first bending joint (710), a second bending joint (711) and a bending gear (707), wherein the proximal end of the first bending joint (710) is connected to the transmission base (701), and the distal end of the second bending joint (711) is connected to the nail magazine device (4), and the distal end of the first bending joint (710) and the proximal end of the second bending joint (711) are engaged through the bending gear (707).
[0010] Furthermore, the first bending joint (710) is capable of performing circular motion around the axis of the first mounting hole (7072) on the bending gear (707); the second bending joint (711) and the first bending joint (710) are fixed by a gear pin (712), so that the tooth surface (7113) of the second bending joint and the tooth surface (7073) of the bending gear are meshed.
[0011] Furthermore, a fourth mounting hole (7132) is respectively provided at the ends of both ends of the first flexible sheet (713), a mounting shaft (7023) is provided at the distal end of the driving rack (702), and the fourth mounting hole (7132) at the proximal end of the first flexible sheet (713) is inserted into the mounting shaft (7023) of the driving rack (702) for fixation; a fourth mounting hole (7132) is also respectively provided at the ends of both ends of the second flexible sheet (7713), a mounting shaft is provided at the distal end of the auxiliary rack (704), and the fourth mounting hole (7132) at the proximal end of the second flexible sheet (7713) is inserted into the mounting shaft (7023) of the auxiliary rack (704) for fixation.
[0012] Furthermore, the invention further comprises a driving gear (705), wherein the driving gear (705) is mounted on a gear mounting column (7014) of the transmission base (701), and the driving gear (705), the driving rack (702) and the auxiliary rack (704) are engaged with each other, and the driving force of the driving rack (702) is transmitted to the auxiliary rack (704) through the driving gear (705).
[0013] Furthermore, it also includes a gear cover (706), the gear cover (706) is installed on the transmission base (701), a positioning protrusion (7061) is provided on one side of the gear cover (706), and a limiting groove (7013) is correspondingly provided on the transmission base (701).
[0014] Furthermore, the nail magazine device (4) comprises a nail magazine base (401), and the second bending joint (711) and the nail magazine base (401) are completely locked.
[0015] Furthermore, the driving rack (702) pulls the first flexible sheet (713) so that the first bending joint (710) and the second bending joint (711) are bent toward the proximal direction through the engagement of the bending gear (707); the driving rack (702) is engaged through the driving gear (707), and the driving gear (707) transmits the driving force to the auxiliary rack (704), so that the auxiliary rack (704) pulls the second flexible sheet (7713) so that the first bending joint (710) and the second bending joint (711) are bent toward the distal direction.
[0016] A stapler comprises any one of the bending components described above.
[0017] After adopting such a design, the utility model has at least the following advantages:
[0018] (1) When the nail magazine structure bends, the flexible sheet is hidden inside the joint for transmission, effectively reducing the space required for transmission.
[0019] (2) Flexible sheet transmission reduces the matching tolerance of the connecting rod type multi-stage shaft hole connection.
[0020] (3) The utility model has a simple structure, good effect, low cost and easy process implementation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0022] Figure 1 This is a schematic diagram of the overall position of the bending assembly of an embodiment of the present utility model;
[0023] Figure 2 This is a schematic diagram of the internal structure of a bending assembly according to an embodiment of the present invention;
[0024] Figure 3 This is a schematic top view of a bending assembly according to an embodiment of the present invention;
[0025] Figure 4 This is an exploded schematic diagram of a bending assembly according to an embodiment of the present invention;
[0026] Figure 5 This is a schematic structural diagram of a transmission base 701 according to an embodiment of the present invention;
[0027] Figure 6This is a schematic structural diagram of a driving rack 702 and a locking block 703 according to an embodiment of the present invention;
[0028] Figure 7 This is a schematic structural diagram of the auxiliary rack 704 according to an embodiment of the present invention;
[0029] Figure 8 This is a schematic structural diagram of a driving gear 705 according to an embodiment of the present invention;
[0030] Figure 9-A This is a schematic structural diagram of a gear cover 706 according to an embodiment of the present invention;
[0031] Figure 9-B This is a schematic structural diagram of the gear cover 706 from another angle according to an embodiment of the present invention;
[0032] Figure 10 This is a schematic structural diagram of a bending gear 707 according to an embodiment of the present invention;
[0033] Figure 11 This is a schematic structural diagram of a position limiting tube 708 according to an embodiment of the present invention;
[0034] Figure 12 This is a schematic structural diagram of an open retaining ring 709 according to an embodiment of the present invention;
[0035] Figure 13-A This is a schematic structural diagram of a first bending joint 710 according to an embodiment of the present invention;
[0036] Figure 13-B This is a structural diagram of the first bending joint 710 from another angle according to an embodiment of the present invention;
[0037] Figure 14-A This is a schematic structural diagram of the second bending joint 711 according to an embodiment of the present invention;
[0038] Figure 14-B This is a schematic structural diagram of the second bending joint 711 at another angle according to an embodiment of the present invention;
[0039] Figure 15 This is a schematic structural diagram of the first flexible sheet 713 according to an embodiment of the present invention;
[0040] Figure 16 This is a schematic structural diagram of the second flexible sheet 7713 according to an embodiment of the present invention; Figure 17 This is a schematic structural diagram of the first transmission tube 205 according to an embodiment of the present invention;
[0041] Figure 18 This is a structural diagram of a nail magazine base 401 according to an embodiment of the present invention;
[0042] Figure 19 This is a schematic diagram of the initial state of the bending assembly of one embodiment of the present invention;
[0043] Figure 20 This is a structural diagram of the initial state of engagement of the gears of the bending assembly according to one embodiment of the present invention;
[0044] Figure 21 This is a schematic structural diagram of the gear meshing of the bending assembly in the embodiment of the present invention when the bending assembly is bent to the left at the maximum angle;
[0045] Figure 22 This is a schematic structural diagram of the gear meshing of the bending assembly in the embodiment of the present invention when the bending assembly is bent rightward to the maximum angle;
[0046] Reference numerals,
[0047] Transmission tube 205, first positioning hole 2051, transmission base 701, driving rack 702, locking block 703, auxiliary rack 704, driving gear 705, gear cover 706, bending gear 707, limiting tube 708, opening retaining ring 709, first bending joint 710, second bending joint 711, gear pin 712, first metal flexible sheet 713, second metal flexible sheet 7713, flexible sheet fixing pin 714, nail magazine device 4, nail magazine base 401, positioning hole 4011, side mounting hole 4012, upper mounting hole 4013, driving rack groove 7011, auxiliary rack groove 7012, limiting groove 7013, gear mounting column 7014, bending gear groove 7015, positioning hole 7016, flexible sheet first channel 70 17. Transmission base distal end 7018, annular limiting groove 7019, second positioning hole 7021, mounting shaft 7023, positioning protrusion 7061, mounting hole 7062, positioning pillar 7071, first mounting hole 7072, bending gear tooth surface 7073, limiting block 7091, mounting post 7101, mounting hole 7102, flexible sheet second channel 7103, first bending joint open channel 7104, mounting groove 7112, tooth surface 7113, flexible sheet third channel 7114, flexible sheet mounting hole 7115, second bending joint open channel 7116, annular positioning protrusion 7117, mounting hole 7118, first single-layer metal sheet 7131, second single-layer metal sheet 77131, fourth mounting hole 7132; DETAILED DESCRIPTION
[0048] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.
[0049] In this document, “upper”, “lower”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.
[0050] The end of each component closer to the operator is defined as the proximal end, and the end farther from the operator is defined as the distal end. The expressions proximal end and distal end are only used to simplify and clarify the description and should not be construed as any limitation to the present invention.
[0051] like Figure 1-22 As shown, an embodiment of the present invention provides a bending assembly based on double flexible sheets, including a bending joint assembly, a first flexible sheet 713 and a second flexible sheet 7713. The proximal end of the bending joint assembly is connected to the transmission base 701 of the transmission device 2, and the distal end of the bending joint assembly is connected to the nail magazine device 4. A driving rack 702 is installed on one side of the transmission base 701, and the distal end of the driving rack 702 is connected to the proximal end of the first flexible sheet 713. After the first flexible sheet 713 passes through the transmission base 701 and the bending joint assembly, it is connected to the rear end of the bending joint assembly. A secondary rack 704 is installed on the other side of the transmission base 701, and the distal end of the secondary rack 704 is connected to the proximal end of the second flexible sheet 7713. After the second flexible sheet 7713 passes through the transmission base 701 and the bending joint assembly, it is connected to the rear end of the bending joint assembly.
[0052] Here, the first flexible sheet (713) and the second flexible sheet (7713) are made of metal, and the metal is selected to have a large resilience to facilitate the bending of the stapler. The first flexible sheet (713) and the second flexible sheet (7713) have the same structure.
[0053] The driving rack 702 is a driving force input end, and the driving rack 702 provides driving force for the bending component 7.
[0054] The bending joint assembly consists of two joints, including a first bending joint 710, a second bending joint 711 and a bending gear 707. The proximal end of the first bending joint 710 is connected to the transmission base 701, and the distal end of the second bending joint 711 is connected to the nail magazine device 4. The distal end of the first bending joint 710 and the proximal end of the second bending joint 711 are engaged through the bending gear 707.
[0055] Specifically, a positioning pillar 7071 is provided on the bending gear 707, a bending gear groove 7015 is provided on the transmission base 701, and a positioning hole 7016 is correspondingly provided in the bending gear groove 7015. The positioning pillar 7071 is inserted into the positioning hole 7016, and the bending gear 707 is installed in the bending gear groove 7015 on the transmission base 701, so that the bending gear 707 is fixed to the transmission base 701;
[0056] Here, in order to make the installation of the bending gear 707 and the transmission base 701 more stable, two positioning pillars 7071 and two positioning holes 7016 are provided respectively.
[0057] A first mounting hole 7072 is provided at the end of the bending gear 707, and a first mounting post 7101 is correspondingly provided on the first bending joint 710. The first mounting post 7101 is mounted on the first mounting hole 7072 of the bending gear 707, so that the first bending joint 710 can perform circular motion around the axis of the first mounting hole 7072 of the bending gear 707.
[0058] There is a second mounting hole 7112 on the second bending joint 711, and the first bending joint 710 is provided with a third mounting hole 7102. The second mounting hole 7112 and the third mounting hole 7102 are aligned, and the gear pin 712 is inserted into the aligned third mounting hole 7102 of the first bending joint 710 and the second mounting hole 7112 of the second bending joint 711, so that the second bending joint tooth surface 7113 and the bending gear tooth surface 7073 are engaged.
[0059] In the embodiment of the present invention, the first bending joint 710 makes a circular motion about the axis of the first mounting hole 7072 on the bending gear 707, and the second bending joint 711 meshes with the tooth surface 7073 of the bending gear, thereby forming a planetary gear structure.
[0060] Since the first mounting hole 7072 and the bending gear tooth surface 7073 of the bending gear 707 are coaxial, and the third mounting hole 7102 of the first bending joint 710 and the second mounting hole 7112 of the second bending joint 711 are fixed, the bending motions of the first bending joint 710 and the second bending joint 711 are linked.
[0061] Here, the first bending joint 710 is provided with a first bending joint open channel 7104, and the second bending joint 711 is provided with a second bending joint open channel 7116. The first bending joint open channel 7104 and the second bending joint open channel 7116 are respectively trumpet-shaped cutting knife channels, which can make way for the cutting knife when the joint bends.
[0062] Furthermore, a fourth mounting hole 7132 is respectively provided at each end of the first flexible sheet 713, and a mounting shaft 7023 is provided at the distal end of the driving rack 702. The fourth mounting hole 7132 at the proximal end of the first flexible sheet 713 is inserted into the mounting shaft 7023 of the driving rack 702 for fixation.
[0063] Here, a first flexible sheet channel 7017 of a first flexible sheet 713 is provided on one side of the transmission base 701, a second flexible sheet channel 7103 of the first flexible sheet 713 is provided on one side of the first bending joint 710, and a third flexible sheet channel 7114 of the first flexible sheet 713 is provided on one side of the second bending joint 711. Similarly, a flexible sheet channel of a second flexible sheet 7713 is provided on the other side of the transmission base 701, a flexible sheet channel of a second flexible sheet 7713 is provided on the other side of the first bending joint 710, and a flexible sheet channel of a second flexible sheet 7713 is provided on the other side of the second bending joint 711; the first flexible sheet 713 is passed through the first channel 7017 of the flexible sheet of the transmission base 701, the second flexible sheet channel 7103 of the first bending joint 710, and the third flexible sheet channel 7114 of the second bending joint 711 in sequence, and the mounting hole 7132 at the other end of the first flexible sheet 713 is connected to the flexible sheet mounting hole 7115 of the second bending joint 711 through a flexible sheet fixing pin 714.
[0064] Similarly, the second flexible sheet 7713 is passed through the flexible sheet channel of the second flexible sheet of the transmission base 701, the flexible sheet channel of the second flexible sheet of the first bending joint 710, and the flexible sheet channel of the second flexible sheet of the second bending joint 711 in sequence. The mounting hole at the other end of the second flexible sheet 7713 is connected to the flexible sheet mounting hole of the second bending joint 711 through a flexible sheet fixing pin.
[0065] Here, the installation methods of the left and right sides are the same, so that the driving rack 702 is connected to the second bending joint 711 through the first flexible sheet 713, and the auxiliary rack 704 is connected to the second bending joint 711 through the second flexible sheet 7713.
[0066] Here, in order to make the flexible sheet more flexible, the first flexible sheet 713 includes two first single-layer metal sheets 7131 , and the second flexible sheet 7713 includes two second single-layer metal sheets 77131 .
[0067] The transmission device 2 in the embodiment of the present invention also includes a transmission tube 205, which is sleeved on the transmission base 701 and can move in the axial direction. The driving rack 702 is installed in the driving rack groove 7011 on one side of the transmission base 701, and the auxiliary rack 704 is installed in the auxiliary rack groove 7012 on the other side of the transmission base 701. A first positioning hole 2053 is provided on the distal end of the side wall of the transmission tube 205, and a second positioning hole 7021 is provided at the proximal end of the driving rack 702. The locking block 703 is inserted into the first positioning hole 2053 and the second positioning hole 7021 to lock the transmission tube 205 and the driving rack 702, so that the driving rack 702 moves axially in the driving rack groove 7011 of the transmission base 701.
[0068] Here, a gear mounting column 7014 is also provided on the transmission base 701, the driving gear 705 is installed on the gear mounting column 7014, and the auxiliary rack 704 is installed in the auxiliary rack groove 7012 of the transmission base 701. The driving gear 705 and the driving rack 702 and the auxiliary rack 704 are engaged with each other to transmit the driving force of the driving rack 702 to the auxiliary rack 704, that is, the movement direction of the auxiliary rack 704 is always opposite to the movement direction of the driving rack 702.
[0069] The bending assembly also includes a gear cover 706, which is provided with a mounting hole 7062. The mounting hole 7062 is installed on the upper end of the gear mounting column 7014 on which the gear 705 is installed on the transmission base 701, thereby limiting the driving gear 705. A positioning protrusion 7061 is provided on one side of the gear cover 706. During installation, the positioning protrusion 7061 needs to be aligned with the limiting groove 7013 corresponding to the gear mounting column 7015 on the transmission base 701 to ensure that the curved surface at the upper end of the gear cover 706 and the transmission base 701 are coaxial.
[0070] The bending assembly also includes a limiting tube 708, which is sleeved on the transmission base 701 until the limiting tube 708 is against the distal end 7018 of the transmission base. At this time, the left side of the proximal end of the limiting tube 708 is the annular limiting groove 7019 of the transmission base 701, and the open retaining ring 709 is installed on the annular limiting groove 7019 of the transmission base 701. Since there is a limiting block 7091 extending inward on the open retaining ring 709, the open retaining ring 709 is locked in the annular limiting groove 7019 of the transmission base 701, and then the open retaining ring 709 limits the limiting tube 708 in the axial direction.
[0071] At this time, the limiting tube 708 restricts the driving rack 702, locking block 703, auxiliary rack 704, driving gear 705, gear cover 706, bending gear 707, first flexible sheet 713, second flexible sheet 7713 and other components in the transmission base 701 to form a stable bending assembly.
[0072] The nail magazine device 4 includes a nail magazine base 401, the annular positioning protrusion 7117 of the second bending joint 711 is inserted into the positioning hole 4011 of the nail magazine base 401, the second bending joint 711 has a mounting hole 7118, the nail magazine base 401 has a side mounting hole 4012 and an upper mounting hole 4013, and the fixing pins 404 are respectively inserted into the aligned mounting holes to completely lock the second bending joint 711 and the nail magazine base 401.
[0073] The working process of the bending assembly of one embodiment of the utility model is as follows:
[0074] When the driving rack 702 moves axially toward the distal end, the driving rack 702 pulls the first flexible sheet 713, thereby driving the first bending joint 710 to bend. Since the first bending joint 710 is engaged with the second bending joint 711 through the bending gear 707, the second bending joint 711 is also driven to bend toward the proximal direction, causing the nail magazine device 4 to bend in one direction, and the maximum bending angle is 60°.
[0075] When the drive rack 702 moves axially toward the proximal end, the drive rack 702 engages through the drive gear 707, and the drive gear 707 transmits the driving force to the auxiliary rack 704. The auxiliary rack 704 pulls the second flexible sheet 7713 to make the first bending joint 710 and the second bending joint 711 bend toward the distal direction, so that the nail magazine assembly bends in the other direction, and the maximum bending angle is 60°.
[0076] Using the design of the bending assembly of the present invention, the unilateral angle interval of the first bending joint 710 and the transmission base 701 is 30°, and the unilateral angle interval of the first bending joint 710 and the second bending joint 711 is also 30°. The maximum bending angle of the bending assembly is the sum of the two bending intervals, 60°.
[0077] During surgery, after the stapler is inserted into the abdominal cavity, the stapler cartridge often needs to bend at a certain angle to reach the tissue where the cutting and suturing are required. The greater the bending angle of the stapler cartridge, the greater the advantages of the laparoscopic stapler during surgery. Therefore, the development of a laparoscopic stapler with better performance is urgent. The stapler assembly introduced in this utility model has at least the following advantages:
[0078] (1) When the nail magazine structure bends, the flexible sheet is hidden inside the joint for transmission, effectively reducing the space required for transmission.
[0079] (2) Flexible sheet transmission reduces the matching tolerance of the connecting rod type multi-stage shaft hole connection.
[0080] (3) The utility model has a simple structure, good effect, low cost and easy process implementation.
[0081] The utility model also discloses a stapler comprising the stapler assembly of any of the above solutions.
[0082] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the utility model disclosed in the specification and examples. This application is intended to cover any variations, uses, or adaptations of the present invention that adhere to the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered merely as exemplary; the true scope and spirit of the present invention are indicated by the following claims.
[0083] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims
1. A bending assembly based on a double flexible sheet, comprising a bending joint assembly, characterized in that: Also includes: A first flexible sheet (713) and a second flexible sheet (7713), the proximal end of the bending joint assembly is connected to the transmission base (701), the distal end of the bending joint assembly is connected to the nail magazine device (4), the side walls of the transmission base (701) are respectively installed with a driving rack (702) and a secondary rack (704), the distal end of the driving rack (702) is connected to the proximal end of the first flexible sheet (713), the first flexible sheet (713) is connected to the rear end of the bending joint assembly after passing through the transmission base (701) and the bending joint assembly, the distal end of the secondary rack (704) is connected to the proximal end of the second flexible sheet (7713), the second flexible sheet (7713) is connected to the rear end of the bending joint assembly after passing through the transmission base (701) and the bending joint assembly.
2. The bending assembly based on double flexible sheets according to claim 1, characterized in that: The first flexible sheet (713) and the second flexible sheet (7713) are respectively made of metal.
3. The bending assembly based on double flexible sheets as claimed in claim 2, characterized in that: The bending joint assembly comprises a first bending joint (710), a second bending joint (711) and a bending gear (707), wherein the proximal end of the first bending joint (710) is connected to the transmission base (701), and the distal end of the second bending joint (711) is connected to the nail magazine device (4), and the distal end of the first bending joint (710) and the proximal end of the second bending joint (711) are engaged through the bending gear (707).
4. The bending assembly based on double flexible sheets as claimed in claim 3, characterized in that: The first bending joint (710) is capable of performing circular motion around the axis of the first mounting hole (7072) on the bending gear (707); the second bending joint (711) and the first bending joint (710) are fixed via a gear pin (712), so that the tooth surface (7113) of the second bending joint (711) and the tooth surface (7073) of the bending gear are meshed.
5. The bending assembly based on double flexible sheets as claimed in claim 4, characterized in that: A fourth mounting hole (7132) is respectively provided at both ends of the first flexible sheet (713), a mounting shaft (7023) is provided at the distal end of the driving rack (702), and the fourth mounting hole (7132) at the proximal end of the first flexible sheet (713) is inserted into the mounting shaft (7023) of the driving rack (702) for fixation; a fourth mounting hole (7132) is also respectively provided at both ends of the second flexible sheet (7713), a mounting shaft is provided at the distal end of the auxiliary rack (704), and the fourth mounting hole (7132) at the proximal end of the second flexible sheet (7713) is inserted into the mounting shaft (7023) of the auxiliary rack (704) for fixation.
6. The bending assembly based on double flexible sheets as claimed in claim 5, characterized in that: The invention also includes a driving gear (705), wherein the driving gear (705) is mounted on a gear mounting column (7014) of the transmission base (701), and the driving gear (705), the driving rack (702) and the auxiliary rack (704) are engaged with each other, and the driving force of the driving rack (702) is transmitted to the auxiliary rack (704) through the driving gear (705).
7. The bending assembly based on double flexible sheets as claimed in claim 6, characterized in that: It also includes a gear cover (706), which is mounted on the transmission base (701). A positioning protrusion (7061) is provided on one side of the gear cover (706), and a corresponding limiting groove (7013) is provided on the transmission base (701).
8. The bending assembly based on double flexible sheets as claimed in claim 7, characterized in that: The nail magazine device (4) comprises a nail magazine base (401), and the second bending joint (711) and the nail magazine base (401) are completely locked.
9. The bending assembly based on double flexible sheets as claimed in claim 8, characterized in that: The driving rack (702) pulls the first flexible sheet (713) so that the first bending joint (710) and the second bending joint (711) are bent toward the proximal direction through the engagement of the bending gear (707); the driving rack (702) is engaged through the bending gear (707), and the bending gear (707) transmits the driving force to the auxiliary rack (704), so that the auxiliary rack (704) pulls the second flexible sheet (7713) so that the first bending joint (710) and the second bending joint (711) are bent toward the distal direction.
10. A stapler, characterized in that: It comprises a bending component based on double flexible sheets as described in any one of claims 1-9.