Anastomat

Abstract

The anastomat comprises a jaw assembly, a rod assembly, a sleeve and a driving unit, the jaw assembly comprises a bin box unit and a nail abutting seat, the bin box unit and the nail abutting seat are connected in a pivoted mode through a limiting pin, a pair of bin box pin holes and a pair of nail abutting seat pin holes are formed in the bin box unit and the nail abutting seat and matched with the limiting pin, and the pair of bin box pin holes and the pair of nail abutting seat pin holes are matched with the limiting pin. When the nail abutting seat pivots relative to the cartridge unit, the position, relative to the cartridge unit and the nail abutting seat, of the limiting pin in the radial direction of the limiting pin is kept unchanged. At least one of the cartridge unit and the nail abutting seat is arranged on the rod assembly; the sleeve is arranged on the rod assembly in a sleeving mode and is in transmission fit with the nail abutting base so that the nail abutting base can pivot relative to the bin box unit. The driving unit comprises a triggering piece capable of rotating, a gear and a rack, and the triggering piece can drive the gear to rotate and drive the rack to move when rotating. The jaw assembly solves the problem that in the prior art, the opening angle of the jaw assembly is small.

Description

Technical Field

[0001] This utility model relates to the field of surgical suturing instruments, and more particularly to a stapler. Background Technology

[0002] Anastomosing devices are frequently used in endoscopic surgical instruments to replace traditional open surgical devices because smaller incisions often shorten postoperative recovery time and reduce complications. Therefore, a series of anastomosing devices have been developed that are suitable for accurately placing the jaw assembly through the cannula of the trocar at the desired surgical site. Once these jaw assemblies are inserted into the tissue, they can process the tissue to be cut.

[0003] As the most commonly used minimally invasive surgical instrument, the stapler requires constant adjustment of the jaw assembly's positioning and precise, secure locking using an endoscope, depending on the surgical procedure. It's not simply about insertion and transmission. Currently, the angle of the stapler jaw assembly is adjusted via a joint mechanism, while the opening and closing motion is controlled by a manual trigger. A drive unit consisting of a trigger, linkage, and slider controls the movement of the cannula toward or away from the anvil. This drives the relative pivoting of the anvil and cartridge unit, achieving opening and closing.

[0004] Combined with Figures 1-4 The image shows a prior art stapler. (Reference) Figure 1 As shown, the stapler mainly consists of a stapler body 5' and a jaw assembly 1'. The jaw assembly 1' typically includes a cartridge unit 11' and an anvil 12'. The cartridge unit 11' is pivotally connected to the anvil 12' via a pin 13', and the two can pivot relative to each other.

[0005] Further reference Figure 2 As shown, Figure 2 The specific structure of the jaw assembly 1' is shown. The cartridge unit 11' includes a cartridge base 111' and a staple cartridge 112', with the staple cartridge 111' disposed between the anvil 12' and the cartridge base 112'.

[0006] The base 111' is pivotally connected to the anvil 12' via a pin 13'. Figure 2 As can be seen from the figure, the bin unit 11' is provided with a pair of bin pin holes 1111', and the anvil seat 12' is provided with a pair of anvil seat pin holes (not shown in the figure). The two ends of the pin shaft 13' are respectively inserted into the two bin pin holes 1111' and the two anvil seat pin holes, and the position of the pin shaft 13' relative to the anvil seat 12' in its radial direction remains unchanged.

[0007] Figure 3 Further shown Figure 2Fig. 2 is a schematic view of the cross-sectional structure of the jaw assembly 1' when the jaw assembly 1' is driven to open, it can be understood that when the jaw assembly 1' is driven to open from the closed state in Fig. 1 to the open state in Fig. 2, the pin shaft 13' moves in the axial direction of the cartridge base 111' by a distance D1, and moves in the direction perpendicular to the axial direction of the cartridge base 111' by a distance D2, so it can be seen that when the anvil abutting seat 12' is pivoted relative to the cartridge base 111', the distance D2 is sacrificed, so that the opening angle of the anvil abutting seat 12' is relatively small; in the process of clamping the tissue to be cut, the pin shaft 13' moves in the direction parallel to the axial direction of the cartridge base 111' by a distance D1, that is, the anvil abutting seat 12' moves in the direction parallel to the axial direction of the cartridge base 111' by a distance D1, which will cause the tissue to be cut clamped by the anvil abutting seat 12' and the cartridge base 11' to escape when the anvil abutting seat 12' moves by a distance D1. Figure 2 Figure 3 Fig. 2 is a schematic view of the cross-sectional structure of the jaw assembly 1' when the jaw assembly 1' is driven to open, it can be understood that when the jaw assembly 1' is driven to open from the closed state in Fig. 1 to the open state in Fig. 2, the pin shaft 13' moves in the axial direction of the cartridge base 111' by a distance D1, and moves in the direction perpendicular to the axial direction of the cartridge base 111' by a distance D2, so it can be seen that when the anvil abutting seat 12' is pivoted relative to the cartridge base 111', the distance D2 is sacrificed, so that the opening angle of the anvil abutting seat 12' is relatively small; in the process of clamping the tissue to be cut, the pin shaft 13' moves in the direction parallel to the axial direction of the cartridge base 111' by a distance D1, that is, the anvil abutting seat 12' moves in the direction parallel to the axial direction of the cartridge base 111' by a distance D1, which will cause the tissue to be cut clamped by the anvil abutting seat 12' and the cartridge base 11' to escape when the anvil abutting seat 12' moves by a distance D1.

[0008] In addition, as shown in Fig. 1, the anastomat further comprises a drive unit 4' for driving the jaw assembly 1' to open and close. Figure 4 The drive unit 4' comprises a rotatable trigger 41' and a connecting rod 42', one end of the trigger 41' is in transmission connection with one end of the connecting rod 42'; the sleeve 3' comprises a sleeve body 31' and a sleeve slider 32', the sleeve slider 32' is sleeved on the side wall of the sleeve body 31' near the proximal end, and the other end of the connecting rod 42' is connected with the sleeve slider 32'.

[0009] In the process of driving the trigger 41' to rotate counterclockwise, the connecting rod 42' is driven to move, the connecting rod 42' pushes the sleeve slider 32' to move forward (that is, to move towards the distal end of the anastomat), and the sleeve body 31' is driven to move forward to press the anvil abutting seat 12', so that the jaw assembly 1' is closed. Figure 4 In the process of driving the trigger 41' to rotate counterclockwise, the connecting rod 42' is driven to move, the connecting rod 42' pushes the sleeve slider 32' to move forward (that is, to move towards the distal end of the anastomat), and the sleeve body 31' is driven to move forward to press the anvil abutting seat 12', so that the jaw assembly 1' is closed.

[0010] However, the connecting rod mechanism has low transmission efficiency and short firing stroke, so it also limits the opening angle of the jaw assembly 1'.

[0011] Due to the above two factors, the opening angle of the jaw assembly 1' in the prior art is usually between 20° and 25°. ​

[0012] In summary, the jaw assembly in the prior art has a small opening angle, and is inconvenient to operate when facing thick tissues. Utility model content

[0013] The utility model discloses an anastomat, to solve the problem of the jaw assembly in the prior art having a small opening angle.

[0014] In order to realize the above-mentioned purpose of the utility model, an embodiment of the utility model provides an anastomat, wherein, comprising:

[0015] The jaw assembly comprises a cartridge unit and a staple abutment, the cartridge unit and the staple abutment are pivotally connected through a limiting pin, a pair of cartridge pin holes and a pair of staple abutment pin holes are arranged on the cartridge unit and the staple abutment and matched with the limiting pin, the two ends of the limiting pin are respectively arranged in the two cartridge pin holes and the two staple abutment pin holes, and the position of the limiting pin in the radial direction of the cartridge unit and the staple abutment remains unchanged.

[0016] The rod assembly is arranged on at least one of the cartridge unit and the staple abutment.

[0017] The sleeve is arranged on the rod assembly and is in transmission cooperation with the staple abutment to make the staple abutment pivot relative to the cartridge unit.

[0018] The driving unit comprises a rotatable trigger, a gear and a rack, the gear is arranged on the trigger and is in meshing with the rack, the rack is connected with the sleeve, and the trigger can drive the gear to rotate and drive the rack to move when the trigger rotates, so that the sleeve moves towards or away from the staple abutment and is in transmission cooperation with the staple abutment.

[0019] As a further improvement of the embodiment of the utility model, a slope is arranged on the proximal end of the staple abutment, when the sleeve is driven to move towards the staple abutment, the distal end of the sleeve abuts against the slope to drive the staple abutment to pivot towards the cartridge unit.

[0020] As a further improvement of the embodiment of the utility model, the included angle between the slope and the axial direction of the staple abutment is 15°-30°.

[0021] As a further improvement of the embodiment of the utility model, an abutting protrusion is arranged on the position close to the proximal end of the slope, an abutting part matched with the abutting protrusion is arranged on the wall of the sleeve, when the sleeve is driven to move away from the staple abutment, the abutting part abuts against the abutting protrusion to drive the staple abutment to pivot away from the cartridge unit.

[0022] As a further improvement of the utility model embodiment, wherein, the intersection of the abutting protrusion and the inclined surface to the distance of the distal end of the inclined surface side 6~8mm.

[0023] As a further improvement of the utility model embodiment, wherein, the gear and the trigger piece are provided with an integral molding structure.

[0024] As a further improvement of the utility model embodiment, wherein, the gear and the gear ratio of the rack are 1:1.

[0025] As a further improvement of the utility model embodiment, wherein, the rack is provided with the axial parallelism of the sleeve, the trigger piece is provided with the installation shaft, and the trigger piece can be uniformly pivoted around the installation shaft to drive the rack uniform motion along the axial.

[0026] As a further improvement of the utility model embodiment, wherein, the sleeve includes sleeve body and sleeve slider, the sleeve slider is sleeved on the lateral wall outside of the sleeve body and is close to the proximal end of the sleeve body, and the rack is connected with the sleeve slider.

[0027] As a further improvement of the utility model embodiment, wherein, the rack and the sleeve slider are provided with an integral molding structure.

[0028] Compared with the prior art, the utility model has the beneficial effects that:

[0029] The transmission structure formed by the trigger piece, the gear and the rack has greater transmission efficiency; when the nail abutting seat pivots relative to the cartridge unit, the position of the limiting pin in the radial direction relative to the cartridge unit and the nail abutting seat remains unchanged, thereby avoiding the stroke loss caused by the pivoting of the nail abutting seat relative to the cartridge unit. By such arrangement, on the one hand, the nail abutting seat can obtain a larger opening angle with the cartridge unit during pivoting away from the cartridge unit, thereby being able to adapt to thicker tissues to be cut; on the other hand, since the stroke of the nail abutting seat along the axial direction of the cartridge unit is avoided, the tissue to be cut can be prevented from escaping toward the distal end of the jaw assembly during the pivoting of the nail abutting seat toward the cartridge unit to clamp the tissue to be cut. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure schematic view of the jaw assembly of the existing technology not being connected with the anastomat body;

[0031] Figure 2 It is a structure schematic view of the jaw assembly of the existing technology not being connected with the anastomat body; Figure 1

[0032] Figure 3 It is a structure schematic view of the jaw assembly of the existing technology not being connected with the anastomat body; Figure 2 ​A cross-sectional view of the jaw assembly when it is open;

[0033] Figure 4 for Figure 1 A partial structural diagram of the anastomosis device body;

[0034] Figure 5 This is a schematic diagram of the structure of a stapler according to an embodiment of the present invention;

[0035] Figure 6 for Figure 5 A partial structural diagram of the anastomosis device;

[0036] Figure 7 for Figure 6 A partial schematic diagram of the cross-section;

[0037] Figure 8 for Figure 6 Enlarged view at point M;

[0038] Figure 9 for Figure 6 A schematic diagram of the partial explosion structure of the middle jaw assembly;

[0039] Figure 10 for Figure 9 Enlarged view at point N;

[0040] Figure 11 for Figure 6 A schematic diagram of the explosion structure.

[0041] The above description of the figures includes the following reference numerals:

[0042] 1', Jaw assembly;

[0043] 11', Storage compartment unit;

[0044] 111', Warehouse base;

[0045] 1111', Box pin hole;

[0046] 112', Stapling

[0047] 12', Anchor seat;

[0048] 121', Abutting protrusion;

[0049] 13', Pin;

[0050] 2', Rod assembly;

[0051] 3', Sleeve;

[0052] 31', Sleeve body;

[0053] 32', Sleeve slider;

[0054] 4', Drive unit;

[0055] 41', Trigger;

[0056] 42', connecting rod;

[0057] 5', Anastomosing device body;

[0058] 1. Jaw assembly;

[0059] 11. Storage compartment unit;

[0060] 111. Storage base;

[0061] 1111, Box pin hole;

[0062] 112. Stapling;

[0063] 12. Anchor seat;

[0064] 121. Anchor pin hole;

[0065] 122. Incline;

[0066] 123. Abutting protrusion;

[0067] 13. Pin;

[0068] 2. Rod assembly;

[0069] 3. Sleeve;

[0070] 31. Sleeve body;

[0071] 311. Contact part;

[0072] 312. Through hole;

[0073] 314. Groove;

[0074] 32. Sleeve slider;

[0075] 33. Clip;

[0076] 4. Drive unit;

[0077] 41. Trigger;

[0078] 411. Install the shaft;

[0079] 42. Gear;

[0080] 43. Gear rack. Detailed Implementation

[0081] 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.

[0082] 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.

[0083] 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.

[0084] To address the problem that the opening angle of the jaw assembly in existing technologies is small, making operation inconvenient when dealing with thick tissues, an embodiment of this utility model provides an anastomosis device.

[0085] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0086] like Figures 5-11 As shown, this utility model provides a stapler, including a jaw assembly 1, a rod assembly 2, a sleeve 3, and a drive unit 4.

[0087] The jaw assembly 1 includes a jaw unit 11 and an anvil seat 12. The jaw unit 11 and the anvil seat 12 are pivotally connected by a limiting pin 13. The jaw unit 11 and the anvil seat 12 are provided with a pair of jaw pin holes 1111 and a pair of anvil seat pin holes 121 that cooperate with the limiting pin 13. The two ends of the limiting pin 13 are respectively inserted into the two jaw pin holes 1111 and the two anvil seat pin holes 121. When the anvil seat 12 pivots relative to the jaw unit 11, the position of the limiting pin 13 in its radial direction relative to the jaw unit 11 and the anvil seat 12 remains unchanged.

[0088] At least one of the bin unit 11 and the anti-pin seat 12 is disposed on the rod assembly 2;

[0089] The sleeve 3 is fitted onto the rod assembly 2 and engages with the anvil 12 in a transmission manner so that the anvil 12 pivots relative to the cartridge unit 11;

[0090] The drive unit 4 includes a rotatable trigger 41, a gear 42, and a rack 43. The gear 42 is mounted on the trigger 41 and meshes with the rack 43. The rack 43 is connected to the sleeve 3. When the trigger 41 rotates, it can drive the gear 42 to rotate and drive the rack 43 to move, so that the sleeve 3 moves toward or away from the anvil 12 and engages with the anvil 12 in a transmission manner, thereby opening or closing the jaw assembly 1.

[0091] The transmission structure consisting of trigger 41, gear 42 and rack 43 has a large transmission efficiency; while when the anvil seat 12 pivots relative to the bin unit 11, the position of the limiting pin 13 in its radial direction relative to the bin unit 11 and the anvil seat 12 remains unchanged, thereby avoiding the stroke loss caused by the anvil seat 12 pivoting relative to the bin unit 11.

[0092] This configuration ensures, on the one hand, that the anvil 12 can achieve a larger opening angle with the magazine unit 11 during its pivoting away from the magazine unit 11, thus accommodating thicker tissues to be cut; on the other hand, by avoiding the travel of the anvil 12 along the axial direction of the magazine unit 11, the tissue to be cut can be prevented from escaping toward the distal end of the jaw assembly 1 during the pivoting of the anvil 12 toward the magazine unit 11 to clamp the tissue to be cut.

[0093] In various embodiments of this utility model, reference is made to Figures 5-11 The cartridge unit 11 may include a cartridge base 111 and a staple cartridge 112, wherein the staple cartridge 112 is configured to detachably store staples. The cartridge base 111 is configured to pivotally connect with the staple anchor 12. The staple cartridge 112 is disposed between the cartridge base 111 and the staple anchor 12, and a cartridge pin hole 1111 is provided on the cartridge base 111.

[0094] To deploy the staples from the staple cartridge 112, the stapler may further include a staple driver and a firing driver, the staple driver being configured to traverse the staple cartridge 112, and the firing driver being configured to advance the staple driver within the staple cartridge. In various embodiments, the anvil 12 may be configured to deform at least a portion of the staple during deployment from the staple cartridge, thereby facilitating suturing of the tissue to be cut.

[0095] It should be noted that in this application, "distal" and "proximal" are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, i.e., closer to the surgical site, is the distal end. "Axial" refers to the axial direction of the cartridge unit 11, that is, the direction of extension of the cartridge unit 11. Figure 5 The left and right directions from a mid-range perspective. Figure 5 From the perspective of the storage unit 11, its far end is the left end and its near end is the right end.

[0096] Similarly, combining Figure 5 As shown, for sleeve 3 and anchor seat 12, the distal end is the left end, and the proximal end is the right end.

[0097] refer to Figures 8-11As shown, a bevel 122 is cleverly provided on the proximal end of the anvil 12. This design allows the distal end of the sleeve 3 to smoothly abut against the bevel 122 when the sleeve 3 is driven towards the anvil 12 by the drive unit 4. Due to the characteristics of the bevel, a component force along the direction of the bevel is generated during the abutment process. This component force then drives the anvil 12 to pivot towards the magazine unit 11, ultimately achieving the closure of the jaw assembly 1.

[0098] This structure is not only simple and efficient, but also enables rapid and accurate relative movement between the anvil 12 and the cartridge unit 11 while ensuring the overall structure of the stapler is compact, thus meeting the dual requirements of speed and precision during surgery.

[0099] refer to Figure 10 For optimal display, a carefully designed angle is present between the inclined surface 122 and the axial direction of the abutment seat 12, that is... Figure 10 The included angle α is controlled within the range of 15° to 30°. This angle setting ensures that the sleeve 3 can generate sufficient force to drive the anvil 12 to pivot when it abuts the inclined surface 122, while avoiding problems such as low transmission efficiency or structural instability caused by an excessively large or small included angle, thereby achieving structural optimization and performance improvement.

[0100] Still for reference Figure 10 As shown, the design of the inclined surface 122 not only enables smooth pivoting of the anvil 12, but also cleverly incorporates an abutment protrusion 123 at its proximal end. This protrusion perfectly matches the abutment portion 311 on the wall of the sleeve 3. The sleeve 3 is typically fitted onto the inclined surface 122. When the sleeve 3 is driven away from the anvil 12 by the drive unit, the abutment portion 311 precisely abuts against the abutment protrusion 123.

[0101] This design allows the anvil 12 to pivot away from the cartridge unit 11 during the retraction of the cannula 3, through the interaction between the abutment protrusion 123 and the abutment portion 311, thereby enabling the jaw assembly 1 to open smoothly. The introduction of this mechanism not only improves the accuracy and efficiency of the operation but also enhances the ease of use and reliability of the entire stapler, providing greater flexibility and convenience for surgical procedures.

[0102] Specifically, the sleeve 3 has a through hole 312 on its wall, and the abutting part 311 is formed on the inner wall of the through hole 311. The abutting part 311 faces the inside of the through hole 312 and extends radially toward the center of the sleeve 3.

[0103] Furthermore, the abutment protrusion 123 is carefully positioned on the inclined surface 122, and its position has been rigorously calculated and experimentally verified to ensure that the distance from its intersection with the inclined surface 122 to the far end of the inclined surface is controlled between 6 and 8 mm. That is... Figure 10 The distance L in the middle is between 6 and 8 mm.

[0104] This distance design ensures that the contact protrusion 123 and the contact part 311 of the sleeve 3 can effectively cooperate to achieve stable force transmission, while avoiding problems such as reduced transmission efficiency or structural interference caused by excessively long or short distances, thus ensuring the accuracy and reliability of the entire anastomosis device operation.

[0105] It should be noted that in this utility model, reference is made to... Figure 6 As shown, a mounting shaft 411 is also provided on the trigger 41, and the trigger 41 can pivot relative to the mounting shaft 411. The rack 43 is arranged in a direction parallel to the axial direction of the sleeve 3. During the process of driving the trigger 41 to pivot at a constant speed around the mounting shaft 411, the gear 42 can be controlled to rotate at a constant speed, thereby controlling the rack 43 to move at a constant speed along the axial direction of the sleeve 3.

[0106] As the rack 43 moves at a constant speed along the axial direction of the sleeve 3, it drives the sleeve 3 to move at a constant speed along its axial direction, thereby enabling the jaw assembly 1 and the trigger 41 to move synchronously and open and close at a constant speed. This design allows operators to better handle the tissue being cut. (Refer to...) Figure 6 As shown in the figure, the proximal end is located on the left and the distal end is located on the right.

[0107] In this embodiment, the gear 42 and the trigger 41 are carefully designed as an integrally formed structure. This structure not only improves the connection strength and stability between the two, but also effectively simplifies the manufacturing and assembly process. The integrally formed design ensures the synchronization and precision of the gear 42 and the trigger 41 during transmission, providing strong support for the smooth operation of the matching device.

[0108] In some embodiments, the gear 42 is configured as a gear portion with gear features located on the trigger 41. This invention does not limit the scope of the invention; designers can make modifications according to actual needs. Any scheme using the same or similar methods as this embodiment is covered within the protection scope of this invention.

[0109] More preferably, in this invention, the transmission ratio between the gear 42 and the rack 43 is precisely set to 1:1, which means that for every rotation of the gear, the rack will move a distance equal to the circumference of the gear.

[0110] In addition, the gear module was selected as 1mm. This setting ensures that the transmission between the gear and the rack is both smooth and efficient, providing a reliable guarantee for the precise operation of the anastomosis device.

[0111] Still for reference Figure 6 As shown, the structure of the sleeve 3 is further optimized, comprising two parts: a sleeve body 31 and a sleeve slider 32. The sleeve body 31 serves as the main structure, and its axial direction is also the axial direction of the sleeve 3. The sleeve slider 32 is cleverly fitted onto the proximal end of the outer sidewall of the sleeve body 31 (i.e., the proximal end of the sleeve 3), with the two fitting tightly together. The rack 42 is directly connected to the sleeve slider 32. This design not only ensures the stability of the transmission but also facilitates maintenance and replacement, demonstrating the flexibility and equivalence of the mechanical structure. It should be noted that the through hole 312 is provided on the sleeve body 31.

[0112] Further reference Figure 11 As shown, in Figure 11 In the figure, the proximal end is located on the right and the distal end is located on the left. Typically, a groove 314 is provided on the side wall of the sleeve body 31 near the proximal end, circumferentially along the sleeve body 31. The sleeve slider 32 is fitted within the groove 314. The sleeve 31 also includes a snap-fit ​​clip 33, and the sleeve slider 32 has a snap-fit ​​groove (not shown in the figure) to accommodate the snap-fit ​​clip 33. When the snap-fit ​​clip 33 is engaged in the snap-fit ​​groove, it is also engaged in the groove 314. This arrangement facilitates the connection between the sleeve body 31 and the sleeve slider 32.

[0113] Furthermore, in this utility model, the sleeve slider 32 and the rack 43 are designed as an integrally formed structure. This design enhances the connection strength and stability between the two, simplifies the assembly process, ensures the synchronization and accuracy during the transmission process, and facilitates maintenance and replacement, thereby improving the reliability and durability of the overall structure.

[0114] In summary, the embodiments of this utility model achieve the following technical effects:

[0115] 1) The transmission structure consisting of trigger 41, gear 42 and rack 43 has a large transmission efficiency, so that when the drive sleeve 3 cooperates with the anvil seat 12, the anvil seat 12 and the compartment unit 11 form a large opening angle.

[0116] 2) When the anvil seat 12 pivots relative to the compartment unit 11, the position of the limiting pin 13 relative to the compartment unit 11 and the anvil seat 12 in its radial direction remains unchanged, thereby avoiding the stroke loss caused by the anvil seat 12 pivoting relative to the compartment unit 11, and further ensuring that the anvil seat 12 can form a large opening angle with the compartment unit 11.

[0117] 3) By avoiding the travel of the anvil seat 12 along the axial direction of the cartridge unit 11, the tissue to be cut can be prevented from escaping toward the distal end of the jaw assembly 1 during the process of the anvil seat 12 pivoting toward the cartridge unit 11 to clamp the tissue to be cut.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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 stapler, characterized in that, include: The jaw assembly includes a cartridge unit and an anvil. The cartridge unit and the anvil are pivotally connected by a limiting pin. The cartridge unit and the anvil are provided with a pair of cartridge pin holes and a pair of anvil pin holes that cooperate with the limiting pin. The two ends of the limiting pin are respectively inserted into the two cartridge pin holes and the two anvil pin holes. The position of the limiting pin relative to the cartridge unit and the anvil in its radial direction remains unchanged. A rod assembly, wherein at least one of the cartridge unit and the anvil is disposed on the rod assembly; A sleeve is fitted onto the rod assembly and engages with the anvil to allow the anvil to pivot relative to the cartridge unit; The drive unit includes a rotatable trigger, a gear, and a rack. The gear is mounted on the trigger and meshes with the rack. The rack is connected to the sleeve. When the trigger rotates, it can drive the gear to rotate and move the rack, so that the sleeve moves toward or away from the anvil and engages with the anvil in a transmission manner.

2. The stapler according to claim 1, characterized in that, The anvil has a ramp at its proximal end. When the sleeve is driven to move toward the anvil, the distal end of the sleeve abuts against the ramp to drive the anvil to pivot toward the cartridge unit.

3. The stapler according to claim 2, characterized in that, The angle between the inclined surface and the axial direction of the anvil is between 15° and 30°.

4. The stapler according to claim 2, characterized in that, An abutment protrusion is provided on the inclined surface near its proximal end, and an abutment portion is provided on the tube wall of the sleeve to cooperate with the abutment protrusion. When the sleeve is driven to move away from the anvil, the abutment portion abuts against the abutment protrusion to drive the anvil to pivot away from the compartment unit.

5. The stapler according to claim 4, characterized in that, The distance from the intersection of the abutting protrusion and the inclined surface to the far end of the inclined surface is 6-8 mm.

6. The stapler according to claim 1, characterized in that, The gear and the trigger are configured as an integral structure.

7. The stapler according to claim 1, characterized in that, The transmission ratio of the gear to the rack is 1:

1.

8. The stapler according to claim 1, characterized in that, The rack is configured to be parallel to the axial direction of the sleeve, and a mounting shaft is provided on the trigger. The trigger can pivot at a constant speed around the mounting shaft to drive the rack to move at a constant speed along the axial direction.

9. The stapler according to claim 1, characterized in that, The sleeve includes a sleeve body and a sleeve slider. The sleeve slider is sleeved on the outer side wall of the sleeve body near its proximal end, and the rack is connected to the sleeve slider.

10. The stapler according to claim 9, characterized in that, The rack and the sleeve slider are configured as an integrally formed structure.

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