Striking return mechanism for anastomat and anastomat

Abstract

The percussion return mechanism is arranged in a handle of the anastomat, the handle comprises a trigger, the percussion return mechanism comprises a percussion rod, a transmission assembly and an unlocking shifting piece, a plurality of protrusions are arranged on the upper surface of the percussion rod, and a strip-shaped groove is formed in the side face of the percussion rod; the transmission assembly is configured to respond to the triggering action of the trigger to enable the triggering rod to move from the near end to the far end, the transmission assembly specifically comprises a transmission push piece, a pawl and a pawl reset elastic piece, and a convex hull connected with the strip-shaped groove in a matched mode is arranged on the side face of the unlocking shifting piece; the unlocking shifting piece is configured to push the convex hull to drive the unlocking shifting piece to rotate upwards by responding to the near end face of the strip-shaped groove when the percussion rod moves, and push the convex hull to drive the unlocking shifting piece to rotate downwards by responding to the far end face of the strip-shaped groove when the percussion rod moves. According to the percussion return mechanism, segmented propelling can be carried out through multiple times of percussion, and a larger anastomosis stroke is achieved. The percussion return mechanism is simple and compact in structure, good in use stability and reliability and low in cost.

Description

Technical Field

[0001] This invention belongs to the field of electric stapler technology, and particularly relates to a firing and retraction mechanism for a stapler and a stapler itself. Background Technology

[0002] A stapler is a widely used medical device in surgery, primarily used to replace traditional manual suturing. It quickly and precisely connects or closes tissues (such as blood vessels and intestines) mechanically, significantly improving surgical efficiency and reducing patient recovery time. The stapler uses titanium staples or absorbable materials (such as absorbable sutures) to fix tissues. Its working principle is similar to a stapler; after the jaws are closed, the staples are pushed out by pressing the handle, achieving tissue anastomosis.

[0003] Patent CN 222787795U provides a stapler that fires by pressing a trigger on a handle, which drives a firing lever. When the trigger resets, a reset elastic element of the firing lever returns the lever to its original position. However, it can only fire once per press, and the limited stroke restricts the length of the stapler. Summary of the Invention

[0004] The purpose of this invention is to provide a firing and retraction mechanism for an anastomosis device that can achieve a longer driving stroke through segmented advancement by multiple firings.

[0005] Another object of the present invention is to provide an anastomosis device using the above-described firing retraction mechanism, which can achieve a greater anastomosis length and achieve better clinical results.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A firing and resetting mechanism for a stapler is disposed in the handle of the stapler, the handle including a trigger, a firing lever, a transmission assembly, and an unlocking lever.

[0007] Specifically, the firing lever extends in the proximal direction, and its upper surface is provided with a plurality of protrusions that are evenly spaced in sequence in the proximal direction, and its side is provided with a strip groove extending in the proximal direction. The transmission assembly is configured to move the firing lever from proximal to distal end in response to a firing action of the trigger, and the distance the firing lever moves in response to a single firing action of the trigger is the distance between the distal ends of two adjacent protrusions. The transmission assembly includes a transmission pusher, a pawl, and a pawl return elastic element. The transmission pusher is connected to the trigger, the pawl is connected to the transmission pusher, the pawl is slidable along the upper surface of the firing lever and can abut against the distal end of the protrusion, and the pawl return elastic element ensures that the pawl always has a tendency to move towards the upper surface of the firing lever. The unlocking paddle is pivotally connected to the housing of the handle. The side of the unlocking paddle has a protrusion that engages with the slot. The unlocking paddle is configured to rotate to a first position when the proximal end face of the slot pushes the protrusion in response to movement of the firing lever, and to rotate to a second position when the distal end face of the slot pushes the protrusion in response to movement of the firing lever. When the unlocking paddle is in the first position, it abuts against the pawl and lifts the pawl upwards to separate it from the firing lever. When the unlocking paddle is in the second position, it separates from the pawl, and the pawl abuts against the firing lever.

[0008] When the unlocking lever is in the first position, the unlocking lever can abut against the pawl and lift the pawl upward to separate it from the firing lever.

[0009] When the unlocking lever is in the second position, the unlocking lever is separated from the pawl, and the pawl is in contact with the firing lever.

[0010] In some embodiments, the firing retraction mechanism of the present invention has an initial unfired state, an intermediate firing state, and a fully fired state.

[0011] In the initial unfired state, the firing lever is located at its nearest pre-set reachable end, the unlocking lever is in the second position, and the pawl is in contact with the proximal end of the furthest protrusion on the firing lever.

[0012] In the intermediate firing state, the firing lever moves from the proximal end to the distal end to the intermediate position before reaching the preset maximum reachable end. The unlocking lever is still in the second position, and the pawl abuts against the proximal end of any protrusion on the firing lever, except for the protrusion at the distal end and the protrusion at the closest end.

[0013] In the fully fired state, the firing lever is located at its preset farthest reach, the unlocking lever is in the first position, the far end of the pawl is lifted upward by the unlocking lever, and the lowest point of the pawl is higher than the highest point of the protrusion on the firing lever. At this time, the firing lever can be reset by pulling it with external force.

[0014] By continuously pressing the trigger, the device can transition from the initial unfired state to the intermediate fired state, and then to the fully fired state. Due to the high friction between the internal components of the assembled stapler, including the high friction within the head assembly, the firing lever will not automatically reset after being fired during the aforementioned state transition process. Nor will it be passively reset due to the automatic reset of the trigger causing the pawl to reset. The firing lever can only be reset by external force when it is in the fully fired state.

[0015] In some embodiments, the protrusion closest to the proximal end of the firing lever is at a distance from the proximal end of the firing lever, and the protrusion closest to the distal end of the firing lever is at a distance from the distal end of the firing lever.

[0016] The effective firing count of the firing and resetting mechanism is equal to the number of protrusions. In specific embodiments, the number of protrusions can be selected as needed. Preferably, the number of protrusions is greater than two, enabling at least two firings. Considering the size of actual products, such as laparoscopic staplers, the number of protrusions is preferably less than five.

[0017] In some embodiments, the contact surfaces between the pawl and the upper surface of the firing lever and the raised surface are both line contacts, reducing the contact area to lower frictional resistance.

[0018] In some embodiments, the unlocking paddle is configured to rotate upward to a first position in response to movement of the firing lever by the proximal end face of the slot pushing the convex hull, and to rotate downward to a second position in response to movement of the firing lever by the distal end face of the slot pushing the convex hull.

[0019] In some embodiments, the pivot connection between the unlocking paddle and the housing of the handle is located below or above the convex bump, preferably the pivot connection between the unlocking paddle and the housing of the handle is located below the convex bump.

[0020] In some embodiments, the protrusion has a barb structure with an inwardly recessed V-shape at its proximal end and a gradually sloping surface at its distal end, which ensures a stable engagement between the pawl and the protrusion during firing. When the trigger automatically resets, the pawl, driven by the transmission push plate, smoothly slides along the push rod to the next protrusion, and then smoothly slides from its distal end to its proximal end along the next protrusion to engage and connect with it, preparing for the next firing.

[0021] In some embodiments, the bottom spacing between two adjacent protrusions is equal to the distance from the proximal bottom end of the protrusion closest to the proximal end of the firing lever to the proximal end face of the slot, and the distance from the proximal bottom end of the protrusion closest to the distal end of the firing lever to the distal end face of the slot. The bottom spacing between two adjacent protrusions refers to the shortest distance between the distal bottom end of the protrusion closest to the firing lever and the proximal bottom end of the protrusion furthest from the firing lever. This arrangement not only ensures the same engagement length and effect for each firing, but also ensures that after the last valid firing, the effective displacement of the firing lever allows the proximal end of the slot on it to exert pressure on the protrusion of the unlocking lever, thereby driving the unlocking lever to pivot upwards; and that when the firing lever is manually reset, the distal end of the slot on it can exert pressure on the protrusion of the unlocking lever, thereby driving the unlocking lever to pivot downwards.

[0022] In some embodiments, the length of the upper surface of the protrusion in the near-far direction is at least 10% to 20% of the bottom distance between two adjacent protrusions, preferably 10% to 15%, to improve stability during contact.

[0023] In some embodiments, the proximal end of the pawl is pivotally connected to the drive push plate, and the distal end of the pawl is an inclined plane that gradually slopes from top to bottom towards the distal end.

[0024] In some embodiments, the unlocking paddle has an unlocking element on its side, with the unlocking element and the protrusion located on opposite sides of the unlocking paddle. The unlocking element can be used to manually assist in rotating the unlocking paddle, preventing interference from internal components or design errors that could cause the unlocking paddle to fail to perform its preset action. The unlocking element can also be used to actively retract the firing element. For example, during use, if an unexpected situation occurs halfway through firing and it is necessary to manually pull back the firing element to withdraw the stapler's cutting blade, manually operating the unlocking element to lift the pawl will pull back the firing element and retract the cutting blade.

[0025] Furthermore, a limiting through hole is provided on the housing of the handle, and the unlocking component passes through the limiting through hole.

[0026] In some embodiments, the convex bulge is disposed on the upper distal end of the unlocking paddle, and the upper proximal end of the unlocking paddle can abut against the pawl. The upper surface of the unlocking paddle is concave V-shaped to prevent its movement from interfering with other components inside the handle, thus ensuring the stability and reliability of the structure.

[0027] In some embodiments, the proximal end of the pawl is pivotally connected to the upper part of the drive push plate, and the lower part of the drive push plate is pivotally connected to the housing of the handle.

[0028] In some embodiments, the firing lever has a through groove extending in the proximal direction in the middle, and the transmission pusher passes through the through groove. This not only avoids interference with other components inside the handle caused by its movement, but also improves the compactness of the internal structure and further ensures the stability and reliability of the structure during operation.

[0029] In some embodiments, the transmission pusher has an arc-shaped slot located below the firing rod and centered on the side away from the firing rod, and the upper end of the firing wrench has a pivot that engages with the arc-shaped slot.

[0030] In some embodiments, the distal end of the firing lever is provided with a firing lever retraction component for moving the firing lever from the distal end to the proximal end.

[0031] Furthermore, the firing lever retraction component includes a connector connected to the upper proximal end of the firing lever and a handle disposed on the top of the connector. The upper part of the handle housing has a slot extending in the proximal direction for the connector to move, and the handle is located outside the handle housing.

[0032] Furthermore, to avoid interference between the firing lever retraction component and the transmission pusher and pawl, it is preferable to place it on the side of the firing lever opposite to the side with the groove.

[0033] Furthermore, a trigger reset elastic element is provided between the trigger and the handle housing. When the external force on the trigger is released, the trigger reset elastic element drives the trigger back to the initial position.

[0034] In some embodiments, the housing of the handle is provided with a set of limiting ribs to restrict the firing lever to move only in the near and far directions, and is also provided with other internal components to restrict them to move only in a preset manner or path.

[0035] A stapler comprising the aforementioned firing and resetting mechanism.

[0036] Furthermore, the anastomosis device also includes an elongated shaft assembly connected to the handle, an end actuator connected to the elongated shaft assembly, and a clamping mechanism in the handle. These components or mechanisms can be designed using existing technologies in the art and are not limited in this invention.

[0037] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The firing and retracting mechanism of this invention can achieve segmented propulsion through multiple firings, resulting in a larger engagement stroke. The firing and retracting mechanism of this invention has a simple and compact structure, good stability and reliability in use, and low cost. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the firing and retraction mechanism of Embodiment 1 in its initial unfired state (part of the handle housing is hidden). Figure 2 for Figure 1 A structural diagram with part of the handle housing removed; Figure 3 This is a schematic diagram of the firing and retraction mechanism of Embodiment 1 when the trigger is not reset during the first firing (part of the handle housing is hidden). Figure 4 This is a schematic diagram of the firing and retraction mechanism of Embodiment 1 in the intermediate firing state (part of the handle housing is hidden). Figure 5 This is a schematic diagram of the firing return mechanism of Example 1 when the trigger is not reset after the third firing (part of the handle housing is hidden). Figure 6 This is a schematic diagram of the firing and retraction mechanism of Embodiment 1 in the intermediate firing state (part of the handle housing is hidden). Figure 7 This is a schematic diagram of the firing and retraction mechanism of Example 1 during the retraction process (part of the handle housing is hidden). Figure 8 This is another structural schematic diagram of the firing and retraction mechanism of Embodiment 1 during the retraction process (part of the handle housing is hidden). Figure 9 This is a schematic diagram of the firing rod in the firing retraction mechanism of Example 1; Figure 10 This is a schematic diagram of the transmission pusher in the firing and retraction mechanism of Example 1; Figure 11 This is an exploded schematic diagram of the pawl of the firing rod in the firing retraction mechanism of Example 1; Figure 12 This is a schematic diagram of the planar structure of the unlocking lever in the firing and retraction mechanism of Embodiment 1; Figure 13 This is a schematic diagram of the planar structure of the unlocking lever in the firing and retraction mechanism of Embodiment 1 from another perspective. Figure 14 This is a schematic diagram of the overall structure of the stapler in Example 2; Figure 15 This is an exploded view of the anastomosis device of Example 2; Figure 16 This is a schematic diagram of the anastomosis device in Example 2 (part of the handle housing is hidden). In the above image, 11. Handle; 12. Trigger; 13. Trigger return spring; Firing lever; 2111, First protrusion; 2112, Second protrusion; 2113, Third protrusion; 212, Slot; 2121, Proximal end face; 2122, Distal end face; 2131, Connector; 2132, Handle; 221. Transmission push plate; 2211. Arc-shaped slot; 222. Pawl; 223. Pawl return elastic element; 224. Pivot 23. Unlocking paddle; 231. Convex bulge; 232. Unlocking component; 31. Clamping mechanism; 311. Clamping operation knob; 4. Slender shaft assembly; 5. End effector. Detailed Implementation

[0039] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0040] In the description of this invention, it should be understood that the terms "upper," "lower," "far end," and "proximal end," etc., used herein are based on Figure 1 The description uses positional relationships. "Inner" and "outer" are positions defined by distance relative to the center of the instrument or component, where "inner" is the position closer to the center of the instrument or component, and "outer" is the position farther from the center of the instrument or component. "Distal" and "proximal" are described from the operator's perspective; the end closer to the operator is the proximal end, and the end farther from the operator is the distal end, i.e., the end closer to the surgical position is the distal end. "Counterclockwise direction" and "clockwise direction" are the rotation directions observed by the operator when using the instrument. The above descriptions of directional terms are only for the convenience of describing embodiments of the present invention and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present invention.

[0041] In the description of this invention, it should be understood that the terms "initial unfired state", "intermediate firing state" and "fully fired state" refer to the state of the firing return mechanism after the external force applied to the trigger 11 is removed and the trigger 11 automatically resets following a firing.

[0042] In the description of the embodiments of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "fixed," etc., should be interpreted broadly. For example, they can refer to a direct fixed connection, an indirect fixed connection through intermediate components, a detachable connection, or an integral part. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention according to the specific circumstances.

[0044] As described below, various structures of the embodiments of the present invention can be implemented through many different implementation methods or examples. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention.

[0045] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Example 1

[0046] This embodiment provides a firing retraction mechanism, such as Figures 1 to 13 As shown, the firing and retraction mechanism is used in the stapler and is located in the handle 1 of the stapler, which has a trigger 11. Specifically, it includes a firing lever 21, a transmission assembly, and an unlocking lever 23.

[0047] Specifically, the firing lever 21 extends in the proximal-remote direction, and its upper surface is provided with a plurality of protrusions evenly spaced in sequence in the proximal-remote direction. Its side surface is provided with a strip-shaped groove 212 extending in the proximal-remote direction. The transmission assembly is configured to move the firing lever 21 from the proximal end to the distal end in response to the firing action of the trigger 11. In response to a single firing action of the trigger 11, the movement distance of the firing lever 21 is the distance between the distal end faces 2122 of two adjacent protrusions. The transmission assembly includes a transmission push plate 221, a pawl 222, and a pawl return elastic element 223. The transmission push plate 221 is connected to the trigger 11, and the pawl 222 is connected to the transmission push plate 221. The pawl 222 can slide along the upper surface of the firing lever 21 and can abut against the distal end of the protrusion. The pawl return elastic element 223 ensures that the pawl 222 always has a tendency to move towards the upper surface of the firing lever 21. In this embodiment, the pawl return elastic element 223 is a torsion spring. The unlocking paddle 23 is pivotally connected to the housing of the handle 1. The side of the unlocking paddle 23 has a protrusion 231, which is connected to the slot 212. The unlocking paddle 23 is configured to, in response to the movement of the firing lever 21, push the proximal end face 2121 of the slot 212 to drive the unlocking paddle 23 to rotate upward to a first position, and in response to the movement of the firing lever 21, push the protrusion 231 to drive the unlocking paddle 23 to rotate downward to a second position. When the unlocking paddle 23 is in the first position, the unlocking paddle 23 can abut against the pawl 222 and lift the pawl 222 upward to separate it from the firing lever 21. When the unlocking paddle 23 is in the second position, the unlocking paddle 23 is separated from the pawl 222, and the pawl 222 abuts against the firing lever 21.

[0048] More specifically, the effective firing count of the firing reset mechanism is equal to the number of protrusions. Specifically, the protrusion closest to the proximal end of the firing lever 21 has a distance between it and the proximal end of the firing lever 21, and the protrusion closest to the distal end of the firing lever 21 has a distance between it and the distal end of the firing lever 21. The distance between the bottoms of two adjacent protrusions is equal to the distance from the proximal bottom of the proximal end of the protrusion closest to the firing lever 21 to the proximal end face 2121 of the slot 212, and the distance from the proximal bottom of the protrusion closest to the distal end of the firing lever 21 to the distal end face 2122 of the slot 212. The bottom spacing between two adjacent protrusions refers to the shortest distance between the far end of the bottom of the protrusion located near the protrusion and the near end of the bottom of the protrusion located far from the protrusion. This not only ensures that the matching length and effect are the same for each firing, but also ensures that after the last effective firing, the effective displacement of the firing lever 21 can cause the proximal end face 2121 of the groove 212 on it to exert pressure on the protrusion 231 of the unlocking lever 23, thereby driving the unlocking lever 23 to pivot upward; and when the firing lever 21 is manually reset, it can cause the far end face 2122 of the groove 212 on it to exert pressure on the protrusion 231 of the unlocking lever 23, thereby driving the unlocking lever 23 to pivot downward. In this embodiment, taking the laparoscopic anastomosis device as an example, the number of protrusions is set to 3, including a first protrusion 2111 near the proximal end of the firing rod 21, a second protrusion 2112 located in the middle of the firing rod 21, and a third protrusion 2113 near the distal end of the firing rod 21. The bottom distance between two adjacent protrusions is designed to be 20mm, and the length of the upper surface of the protrusion in the proximal direction is 10% of the bottom distance between two adjacent protrusions to ensure stability during contact. In this embodiment, the contact surfaces of the pawl 222 with the upper surface of the firing lever 21 and the surface of the protrusion are all line contacts to reduce the contact area and reduce frictional resistance. The proximal end of the pawl 222 is pivotally connected to the transmission push plate 221, and the distal end of the pawl 222 is a slope that gradually slopes from top to bottom. The protrusion has a barb structure, with its proximal end being an inwardly recessed V-shape and its distal end being a slope that gradually slopes from top to bottom. This ensures a stable engagement between the pawl 222 and the protrusion during firing. When the trigger 11 automatically resets, the pawl 222, driven by the transmission push plate 221, smoothly slides along the push rod to the next protrusion, and then smoothly slides from its distal end face 2122 to its proximal end face 2121 along the next protrusion and engages with it, preparing for the next firing.

[0049] More specifically, in this embodiment, the firing lever 21 has a through groove extending in the proximal direction in its middle. The transmission pusher 221 passes through the through groove, which not only prevents its movement from interfering with other components inside the handle 1, but also improves the compactness of the internal structure, further ensuring the stability and reliability of the structure's operation. The proximal end of the pawl 222 is pivotally connected to the upper part of the transmission pusher 221, and the lower part of the transmission pusher 221 is pivotally connected to the housing of the handle 1. In this embodiment, the transmission pusher 221 has an arc-shaped slot 2211 located below the firing lever 21 with its center located on the side away from the firing lever 21. The upper end of the firing wrench has a pivot, which is connected to the arc-shaped slot 2211.

[0050] More specifically, in this embodiment, the convex bulge 231 is disposed on the upper distal end of the unlocking paddle 23, and the upper proximal end of the unlocking paddle 23 can abut against the pawl 222. The upper surface of the unlocking paddle 23 is concave V-shaped, which can prevent its movement from interfering with other components inside the handle 1, ensuring the stability and reliability of the structure. In this embodiment, the unlocking paddle 23 has an unlocking element 232 on its side. The unlocking element 232 and the convex bulge 231 are disposed on opposite sides of the unlocking paddle 23. A limiting through hole is provided on the housing of the handle 1, and the unlocking element 232 passes through the limiting through hole. The unlocking element 232 can be used to manually assist in driving the rotation of the unlocking paddle 23, avoiding the unlocking paddle 23 from failing to perform the preset action due to internal component interference or design errors.

[0051] More specifically, in this embodiment, the distal end of the firing lever 21 is provided with a firing lever retraction component for moving the firing lever 21 from the distal end to the proximal end. The firing lever retraction component includes a connector 2131 connected to the upper part of the proximal end of the firing lever 21 and a handle 2132 disposed on the top of the connector 2131. The upper part of the housing of the handle 1 is provided with a slot 13 extending in the proximal direction for the movement of the connector 2131, and the handle 2132 is located outside the housing of the handle 1. In order to avoid interference of the firing lever retraction component with the transmission push plate 221 and the pawl 222, it is preferably disposed on the side of the firing lever 21 opposite to the side provided with the strip groove 212.

[0052] More specifically, in this embodiment, the housing of the handle 1 is provided with a limiting rib group for restricting the firing lever 21 to move only in the near and far directions. It is also provided with other internal components to restrict them to move only according to a preset movement mode or movement path. A trigger return elastic element 12 is also provided between the trigger 11 and the housing of the handle 1. When the external force on the trigger 11 is released, the trigger return elastic element 12 drives the trigger 11 back to the initial position. In this embodiment, the trigger return elastic element 12 is a torsion spring.

[0053] The firing and retraction mechanism in this embodiment has an initial unfired state, an intermediate firing state, and a fully fired state.

[0054] In the initial unfired state, the firing lever 21 is located at the preset nearest end it can reach, the unlocking paddle 23 is in the second position, and the pawl 222 is in contact with the proximal end of the farthest protrusion (third protrusion 2113) on the firing lever 21.

[0055] In the intermediate firing state, the firing lever 21 moves from the proximal end to the distal end to the intermediate position before reaching the preset maximum reachable end. The unlocking paddle 23 is always in the second position, and the pawl 222 abuts against the proximal end of the protrusion (second protrusion 2112) on the firing lever 21, excluding the protrusion at the distal end and the protrusion at the proximal end.

[0056] When fully fired, the firing lever 21 is at its preset maximum reach, the unlocking paddle 23 is in the first position, the far end of the pawl 222 is lifted upward by the unlocking paddle 23, and the lowest point of the pawl 222 is higher than the highest point of the protrusion on the firing lever 21. At this time, the firing lever 21 can be reset by pulling it with external force.

[0057] During the movement of the firing lever 21 from the far end to the near end, the unlocking paddle 23 remains in the first position until the firing lever 21 reaches the near end, at which point the unlocking paddle 23 moves to the second position and returns to the initial unfired state.

[0058] By continuously pressing the trigger 11, the device can transition from the initial unfired state to the intermediate firing state and then to the fully fired state. Due to the large friction between the internal components of the assembled stapler, including the large friction within the head assembly, the firing lever 21 will not automatically reset after being fired during the aforementioned state transition process. Nor will it be passively reset due to the automatic reset of the trigger 11 causing the pawl 222 to reset. The firing lever 21 can only be reset by external force when it is in the fully fired state. Example 2

[0059] This embodiment provides a long-stroke stapler, such as Figures 14 to 16 As shown, it includes the firing and retraction mechanism of Embodiment 1. The long-stroke stapler of this embodiment also includes an elongated shaft assembly 4 connected to the handle 1, an end actuator 5 connected to the elongated shaft assembly 4, and a clamping mechanism 31 provided in the handle 1. These components or mechanisms adopt existing designs in the art. Except for the firing and retraction mechanism, the components or mechanisms in this embodiment are basically the same as those in patent CN 222787795U, and will not be described again in this document.

[0060] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A firing reset mechanism for a stapler disposed in a handle of the stapler, the handle including a trigger, the firing reset mechanism comprising: It comprises: a firing rod extending in a proximal-distal direction, the upper surface of which is provided with a plurality of protrusions uniformly spaced in the proximal-distal direction, and the side surface of which is provided with a strip-shaped slot extending in the proximal-distal direction; a transmission assembly configured to move the firing rod from the proximal end to the distal end in response to a firing action of the trigger, and the movement distance of the firing rod in response to one firing action of the trigger is the distance between the distal ends of two adjacent protrusions, the transmission assembly comprising a transmission push piece, a pawl, and a pawl reset elastic member, the transmission push piece being connected with the trigger, the pawl being connected with the transmission push piece, the pawl being slidable along the upper surface of the firing rod and being capable of abutting against the distal end of the protrusion, and the pawl reset elastic member causing the pawl to always have a tendency to move towards the upper surface of the firing rod; an unlocking tab, the side surface of which is provided with a convex bump, the convex bump being connected with the strip-shaped slot, the unlocking tab being configured to be driven to rotate to a first position by the proximal end surface of the strip-shaped slot in response to the movement of the firing rod, and to be driven to rotate to a second position by the distal end surface of the strip-shaped slot in response to the movement of the firing rod, the unlocking tab being capable of abutting against the pawl and lifting the pawl upward to separate the pawl from the firing rod when the unlocking tab is in the first position, and the unlocking tab being separated from the pawl when the unlocking tab is in the second position, and the pawl abutting against the firing rod.

2. The firing reset mechanism for a stapler of claim 1, wherein, The distance between the proximal end of the protrusion closest to the proximal end of the firing rod and the proximal end of the firing rod, and the distance between the distal end of the protrusion closest to the distal end of the firing rod and the distal end of the firing rod exist; and / or, the number of protrusions is greater than 2; and / or, the number of protrusions is less than 5.

3. The firing reset mechanism for a stapler of claim 1, wherein, The contact surface between the pawl and the upper surface of the firing rod and the surface of the protrusion is linear contact; and / or, the protrusion has a barb structure, the proximal end of which is a V-shaped inward protrusion, and the distal end of which is a downwardly and distally inclined slope.

4. The firing reset mechanism for a stapler of claim 1, wherein, The distance between the bottom of the two adjacent protrusions is equal to the distance between the bottom of the protrusion closest to the proximal end of the firing rod and the proximal end surface of the strip-shaped slot, and the distance between the bottom of the protrusion closest to the distal end of the firing rod and the distal end surface of the strip-shaped slot. and / or, the length of the upper surface of the protrusion in the proximal-distal direction is at least 10%-20% of the distance between the bottoms of the two adjacent protrusions.

5. The firing reset mechanism for a stapler of claim 1 wherein, The proximal end of the pawl is pivotally connected with the transmission push piece, and the distal end of the pawl is a downwardly and distally inclined slope.

6. The firing reset mechanism for a stapler of claim 1 wherein, The side surface of the unlocking tab is provided with an unlocking member, and the unlocking member and the convex bump are arranged on opposite sides of the unlocking tab.

7. The firing reset mechanism for a stapler of claim 6, wherein, A limiting through hole is formed in the shell of the handle, and the unlocking member is arranged in the limiting through hole.

8. The firing reset mechanism for a stapler of claim 1 wherein, The unlocking tab is configured to rotate upward to a first position in response to the proximal end surface of the strip-shaped slot pushing the convex bump when the firing rod moves, and rotate downward to a second position in response to the distal end surface of the strip-shaped slot pushing the convex bump when the firing rod moves. And / or, the pivoting connection between the unlocking tab and the shell of the handle is located below or above the convex bump.

9. The firing reset mechanism for a stapler of claim 1 wherein, The convex bump is arranged on the distal upper part of the unlocking tab, the proximal upper part of the unlocking tab can be in contact with the pawl, and the upper end surface of the unlocking tab is V-shaped downwardly concave.

10. The firing reset mechanism for a stapler of claim 1 wherein, The proximal end of the pawl is pivotally connected with the upper part of the transmission push piece, and the lower part of the transmission push piece is pivotally connected with the shell of the handle. And / or, the middle part of the firing rod is provided with a through slot extending in the proximal-distal direction, and the transmission push piece is arranged in the through slot.

11. The firing reset mechanism for a stapler of claim 1 wherein, An arc-shaped slot hole is arranged on the transmission push piece, which is below the firing rod and has a center located away from the firing rod, and the upper end part of the firing wrench is provided with a pivot, which is connected with the arc-shaped slot hole.

12. The firing reset mechanism for a stapler of claim 1 wherein, The distal end of the firing rod is provided with a firing rod return component for driving the firing rod to move from the distal end to the proximal end.

13. The firing reset mechanism for a stapler of claim 12, wherein, The firing rod return component includes a connecting piece connected with the proximal upper part of the firing rod and a handle 2132 arranged on the top of the connecting piece, and the upper part of the shell of the handle is provided with a slot hole extending in the proximal-distal direction for movement of the connecting piece, and the handle 2132 is located outside the shell of the handle.

14. The firing reset mechanism for a stapler of claim 1 wherein, The shell of the handle is provided with a limiting rib group for limiting the firing rod to move only in the proximal-distal direction.

15. An anastomat characterized by comprising: The anastomat comprises the firing reset mechanism according to any one of claims 1 to 14.

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