Reverse folding stapler

Abstract

This invention relates to a reverse-folding stapler, belonging to the field of medical devices. Its anvil assembly includes several anvil plates, which are folded away from the suture surface under the drive of a rod assembly, thus achieving reverse folding of the anvil assembly. Because the anvil assembly can be reverse-folded, its radial dimension decreases after folding. Therefore, when the reverse-folding stapler is withdrawn after suturing, the anvil assembly will not contact the suture surface or the friction between the anvil assembly and the suture surface will be reduced. This avoids the problem of the anvil assembly rubbing against the suture surface or causing the surrounding tissue to move and pull on the suture surface during withdrawal, ensuring the anastomosis effect and improving the precision and recovery of the surgery.

Description

Technical Field

[0001] This invention relates to a reverse folding stapler, belonging to the field of medical devices. Background Technology

[0002] Tubular staplers are mainly used in esophageal, gastrointestinal, and other digestive tract surgeries. They consist of a stapler body and an anvil assembly for docking with the stapler body. The anvil assembly and the stapler body are placed separately inside the body, docked, and then closed, sutured, and cut. After suturing is completed, the stapler body and the anvil assembly are removed together.

[0003] While existing anastomotic devices can efficiently perform suturing and cutting tasks in intestinal or esophageal surgeries, they face a significant challenge: the tight connection of the staples causes tissue folding in the sutured area (i.e., the suture surface), resulting in a significantly smaller inner diameter compared to the healthy tissue side. Since the anvil head of the anvil assembly is typically designed to be slightly smaller than the normal inner diameter of the intestine or esophagus, when the anvil assembly is removed, the side edge of the anvil head inevitably rubs and slightly scrapes against the fragile tissue at the suture site as it passes through the area with the reduced inner diameter after suturing. This process may pull and disturb the tissue at the suture site, thus adversely affecting the anastomosis effect and reducing the precision and recovery rate of the surgery. Summary of the Invention

[0004] The purpose of this invention is to provide a reverse-folding stapler that can guarantee the anastomosis effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a reverse folding stapler, comprising:

[0006] The stapler body includes a rod assembly, a staple cartridge assembly disposed on opposite sides of the rod assembly, and a gripping assembly, wherein the staple cartridge assembly has a suture surface; and

[0007] An anvil assembly is disposed on the shaft assembly. The anvil assembly includes an anvil rod and an anvil plates pivotally connected to the anvil rod. A plurality of anvil plates are arranged circumferentially along the anvil rod. A plurality of nail holes are formed on each anvil plate. The anvil plates are switched between a first position and a second position under the drive of the shaft assembly.

[0008] When the anvil is in the first position, the plane where the nail pit is located is perpendicular to the axis of the anvil rod; when the anvil is switched from the first position to the second position under the drive of the rod assembly, the anvil is folded away from the suture surface.

[0009] Furthermore, the anvil is provided with a traction assembly, which drives the anvil plate to switch between a first position and a second position under the action of the rod body assembly.

[0010] Furthermore, the traction assembly includes a sliding ring sleeved on the anvil and a traction rod with its two ends hinged to the sliding ring and the anvil, respectively.

[0011] Furthermore, the anvil bar is also provided with a stop structure and an actuation structure; wherein, at least one of the stop structure and the actuation structure is linked with the bar body assembly, when the anvil is in the first position, the stop structure applies a force to the sliding ring to keep the sliding ring stationary; the actuation structure applies a force to the sliding ring to move the sliding ring away from the suture surface, thereby driving the anvil to change from the first position to the second position.

[0012] Furthermore, the nail pit is located on the outside of the position where the nail anvil plate is hinged to the traction rod.

[0013] Furthermore, the plurality of anvils include a plurality of first anvils and a plurality of second anvils spaced apart, and the anvil rod includes a first pivot portion pivotally connected to the first anvil and a second pivot portion pivotally connected to the second anvil, the first pivot portion and the second pivot portion being staggered in the axial direction of the anvil rod.

[0014] Furthermore, the traction assembly includes a first traction assembly corresponding to the first anvil and a second traction assembly corresponding to the second anvil. The stop structure includes a first stop structure that applies force to the first traction assembly and a second stop structure that applies force to the second traction assembly. The actuation structure includes a first actuation structure that applies force to the first traction assembly and a second actuation structure that applies force to the second traction assembly. The first actuation structure and the second stop structure include springs sleeved on the anvil.

[0015] Furthermore, the anvil rod is a hollow rod, and a first groove and a second groove extending along the axial direction of the anvil rod are formed on the anvil rod. The first groove and the second groove are arranged vertically at intervals along the axial direction. A push rod is provided inside the anvil rod, and a first stop structure and a second actuation structure are formed on the push rod. The first stop structure is located in the first groove, and the second actuation structure is located in the second groove.

[0016] Furthermore, the rod assembly includes a closing rod, the push rod is disposed on the closing rod, the nail cartridge assembly includes a cartridge housing and a fixed sleeve fixed inside the cartridge housing, the closing rod and the anvil rod are located inside the fixed sleeve, a positioning spring is disposed inside the fixed sleeve, the positioning spring applies a force to the anvil rod in the direction of the anvil plate, and a locking structure for axially fixing the anvil rod is disposed between the anvil rod and the fixed sleeve.

[0017] Furthermore, a first insertion structure is provided between the push rod and the closing rod, a docking rod is provided inside the fixed sleeve, a second insertion structure is provided between the anvil rod and the docking rod, the positioning spring is located below the docking rod, and the anvil assembly and the stapler body are docked through the first insertion structure and the second insertion structure.

[0018] The beneficial effects of this invention are as follows: The anvil assembly of this application includes a plurality of anvil plates, which are folded away from the suture surface under the drive of the rod assembly to achieve reverse folding of the anvil assembly. Since the anvil assembly can achieve reverse folding, its radial dimension becomes smaller after folding. Therefore, when the reverse folding stapler is withdrawn after suturing, the anvil assembly will not contact the suture surface or the friction between the anvil assembly and the suture surface will be reduced when it passes the suture surface. Thus, the problem of the suture surface being pulled due to friction of the anvil assembly against the suture surface or movement of the surrounding tissue can be avoided when the anvil assembly is withdrawn, thereby ensuring the anastomosis effect and improving the precision of the surgery and the recovery effect.

[0019] In addition, compared with the forward folding of the anvil assembly, the reverse folding of the anvil assembly can prevent the anvil from bringing the tissue into the folded space during the folding process, thus preventing the tissue from getting stuck. Furthermore, since the opening after the reverse folding is opposite to the withdrawal direction, it can also prevent the tissue from entering the folded space or between two adjacent anvils during the withdrawal process, thus preventing the tissue from getting stuck.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an anvil assembly according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A cross-sectional view of the anvil assembly shown;

[0023] Figure 3 for Figure 1A schematic diagram of the structure of the anvil rod in the diagram;

[0024] Figure 4 This is a partial structural schematic diagram of the anastomosis device body according to an embodiment of the present invention;

[0025] Figure 5 for Figure 4 A cross-sectional view of the structure shown;

[0026] Figure 6 This is a cross-sectional view of a portion of the structure of a reverse-folding stapler according to an embodiment of the present invention;

[0027] Figure 7 for Figure 6 A cross-sectional view of the structure shown in its closed state;

[0028] Figure 8 for Figure 7 Enlarged view of the middle section structure;

[0029] Figure 9 for Figure 6 The structure shown is a cross-sectional view after part of the anvil plate has been folded over;

[0030] Figure 10 for Figure 6 The structure shown is a cross-sectional view after all the nail and anvil pieces have been folded over;

[0031] Figure 11 This is a cross-sectional view of a portion of the structure of a reverse-folding stapler according to another embodiment of the present invention;

[0032] Figure 12 for Figure 11 The diagram shows a cross-sectional view of the structure in its second position. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Please see Figure 1 , Figure 4 and Figure 10 An embodiment of the present invention illustrates a reverse-folding stapler comprising a stapler body and an anvil assembly 100. The stapler body includes a rod assembly, a cartridge assembly disposed on opposite sides of the rod assembly, and a gripping assembly (not shown). The rod assembly includes an outer tube, a closing rod 21 disposed within the outer tube, and a firing rod (not shown), wherein the gripping assembly and the cartridge assembly are respectively fixed at both ends of the outer tube. One end of the closing rod 21 is connected to a drive assembly within the gripping assembly, and the other end is connected to the anvil assembly 100, for closing the stapler body and the anvil assembly 100. One end of the firing rod is connected to the drive assembly within the gripping assembly, and the other end is connected to the cartridge assembly, for suturing and cutting operations. The cartridge assembly includes a housing 22, a cartridge (not shown) disposed within the housing, etc., and has a suture surface (not shown). In this embodiment, the cartridge assembly and the gripping assembly employ existing technology, which will not be described in detail here.

[0038] Anvil assembly 100 is disposed on closing rod 21. Anvil assembly 100 includes anvil rod 11 and a plurality of anvil plates 12 pivotally connected to anvil rod 11, the plurality of anvil plates 12 being arranged circumferentially along anvil rod. The anvil rod 11 is connected to closing rod 21. Each anvil plate 12 has a plurality of nail holes (not shown), and the anvil plate 12 is in a first position under the drive of the rod assembly ( Figure 7 As shown), second position ( Figure 10The transition between the two positions is shown below. When the anvil plate 12 is in the first position, the plane containing the nail pit is perpendicular to the axis of the shaft assembly (which is the axis of the anvil bar 11). This first position can also be called the unfolded position or the unfolded state. Driven by the closing rod 21, when the anvil plate 12 transitions from the first position to the second position, the anvil plate 12 folds along the axis of the shaft assembly and away from the stitching surface. This second position can also be called the reverse folding position or the reverse folding state.

[0039] Because the aforementioned anvils 12 are folded away from the suture surface under the drive of the closing rod 21, the anvil assembly 100 can be folded in the opposite direction. Since the anvil assembly 100 can be folded in the opposite direction, its radial dimension becomes smaller after folding. Therefore, when the reverse folding stapler is withdrawn after suturing, the anvil assembly 100 will not contact the suture surface or the friction between the anvil assembly 100 and the suture surface will be reduced. Thus, the problem of the anvil assembly 100 rubbing against the suture surface or causing the surrounding tissue to move when withdrawing can be avoided, thus ensuring the anastomosis effect and improving the precision of the surgery and the recovery effect.

[0040] Furthermore, compared to the forward folding of the anvil assembly 100, the reverse folding of the anvil assembly 100 can prevent the anvil plate 12 from bringing the tissue into the folded space during the folding process, thus preventing the tissue from getting stuck. Also, since the opening after the reverse folding is opposite to the withdrawal direction, it can also prevent the tissue from entering the folded space or between two adjacent anvil plates 12 during the withdrawal process, thus preventing the tissue from getting stuck.

[0041] Please combine Figures 1 to 3 To facilitate the reverse flipping of the anvil plates 12, the anvil plates 12 are pivotally connected to the anvil rod 11, with the anvil rod 11 perpendicular to the plane formed by the anvil plates 12 in the first position. In this embodiment, the anvil plates 12 are generally fan-shaped, and the anvil plates 12 are independent components. When in the first position, the anvil plates 12 are spliced ​​together to form a ring structure. Specifically, the anvil plates 12 include a plurality of first anvil plates 121 and a plurality of second anvil plates 122 spaced apart. The anvil rod 11 includes a first pivot portion 111 pivotally connected to the first anvil plates 121 and a second pivot portion 112 pivotally connected to the second anvil plates 122. The first pivot portion 111 and the second pivot portion 112 are staggered in the axial direction of the anvil rod 11. With this configuration, when flipping the anvil plate 12 in the reverse direction, the first anvil plate 121 is flipped in the reverse direction first, and then the second anvil plate 122 is flipped in the reverse direction, thereby preventing interference between the two adjacent anvil plates 12 and facilitating the flipping.

[0042] In another embodiment, several anvils can also be connected by a connecting piece that can be circumferentially folded or retracted. When the anvil is in a first position, the anvils on both sides of the connecting piece apply an outward pulling force to unfold the connecting piece; when the anvil changes from the first position to a second position, the anvils on both sides of the connecting piece apply a relative force to fold or retract the connecting piece. Nail pits can also be formed on the connecting piece.

[0043] The anvil 12 is driven by a traction assembly 13, which is mounted on the anvil shaft 11. The traction assembly 13 drives the anvil 12 to switch between a first position and a second position under the influence of the shaft assembly. To prevent the traction assembly 13 from interfering with the firing of the suture nail during firing, in this embodiment, the nail pit is located on the outside of the hinged position between the anvil 12 and the traction assembly 13.

[0044] In this embodiment, the traction assembly 13 includes sliding rings 1311 and 1321 sleeved on the anvil 11 and traction rods 1312 and 1322 respectively hinged at both ends to the sliding rings 1311 and 1321 and the anvil plate 12. In this embodiment, since the anvil plate 12 includes a first anvil plate 121 and a second anvil plate 122 that are folded in sequence, the traction assembly 13 correspondingly includes a first traction assembly 131 corresponding to the first anvil plate 121 and a second traction assembly 132 corresponding to the second anvil plate 122. The first traction assembly 131 and the second traction assembly 132 have the same structure. Rod portions 1313 and 1323 are formed radially extending on the sliding rings 1311 and 1321, and the traction rods 1312 and 1322 are hinged to the free ends of the rod portions 1313 and 1323. The hinge position between the anvil plate 12 and the traction rods 1312 and 1322 is located below the anvil plate 12 when it is in the first position (i.e., below the first position). Figure 1 (The location shown is a descriptive viewpoint). In this embodiment, there are four first nail anvils 121 and four second nail anvils 122. In other embodiments, other quantities can be set as needed.

[0045] In another embodiment, the traction component can also be a traction rope, for example, one end of which is connected to the anvil and the other end to the closing rod. The traction rope applies tension to the anvil to position it in a first position. To ensure that the anvil is in the first position and not pulled forward by the traction rope, a stop structure can be provided between the anvil and the anvil rod to prevent the anvil from folding back towards the suture surface after it is in the first position. To facilitate the reverse folding of the anvil, a torsion spring can be provided between the anvil and the anvil rod. When the traction rope applies tension to the anvil to position it in the first position, the torsion spring is in a tensioned state. When the tension of the traction rope on the anvil is removed, the torsion spring applies force to the anvil to drive it to fold away from the suture surface, so that the anvil changes from the first position to the second position, achieving the reverse folding.

[0046] In this embodiment, the anvil 11 is further provided with a stop structure and an actuation structure, wherein at least one of the stop structure and the actuation structure is linked to the closing rod 21. When the anvil 12 is in the first position, the stop structure applies a force to the sliding rings 1311 and 1321 to keep the sliding rings 1311 and 1321 stationary; the actuation structure applies a force to the sliding rings 1311 and 1321 to move the sliding rings 1311 and 1321 away from the suture surface, thereby driving the anvil 12 to change from the first position to the second position. Specifically, the stop structure includes a first stop structure 141 that applies a force to the first traction assembly 131 and a second stop structure 142 that applies a force to the second traction assembly 132. The actuation structure includes a first actuation structure 151 that applies a force to the first traction assembly 131 and a second actuation structure 152 that applies a force to the second traction assembly 132. Specifically, the first actuation structure 151 and the second stop structure 142 are springs sleeved on the anvil rod 11. The first actuation structure 151 and the second stop structure 142 can be referred to as the first spring 151 and the second spring 142.

[0047] The anvil rod 11 is a hollow rod, and a first groove 113 and a second groove 114 extending along the axial direction of the anvil rod 11 are formed on the anvil rod 11. The first groove 113 and the second groove 114 are arranged vertically at intervals along the axial direction. In this embodiment, the first groove 113 and the second groove 114 are located on the same side. In other embodiments, the first groove 113 and the second groove 114 may not be located on the same side, such as being located on opposite sides of the anvil rod 11. A push rod 16 is provided inside the anvil rod 11, and the push rod 16 is disposed on the closing rod 21. A first stop structure 141 and a second actuation structure 152 are formed on the push rod 16. The first protrusion 141 is located in the first groove 113, and the second actuation structure 152 is located in the second groove 114. Specifically, the first stop structure 141 and the second actuation structure 152 are protrusions formed vertically on the push rod 16. The first stop structure 141 and the second actuation structure 152 can be referred to as the first protrusion 141 and the second protrusion 152.

[0048] To prevent interference between the first protrusion 141, the second protrusion 152, and the first spring 151 and the second spring 142, and to facilitate longitudinal fixing of the first spring 151 and the second spring 142, in this embodiment, the anvil rod 11 has different diameter segments, detailed as follows: Figure 3 For the purpose of describing the perspective, the anvil 11 has a first rod segment 114, a second rod segment 115, a third rod segment 116, and a fourth rod segment 117 arranged sequentially from top to bottom. The first rod segment 114 has a head 118 for pivoting with the anvil plate 12, and a first pivot portion 111 and a second pivot portion 112 are formed on the head 118. The diameters of the first rod segment 114, the second rod segment 115, the third rod segment 116, and the fourth rod segment 117 increase sequentially.

[0049] The first groove 113 is located on the first rod segment 114. A first stepped surface 1151 is formed between the first rod segment 114 and the second rod segment 115. A first spring 151 is sleeved on the first rod segment 114. One end of the first spring 151 is fixed (e.g., welded) to the bottom surface of the head 118, and the other end is fixed (e.g., welded) to the first sliding ring 1311. The first sliding ring 1311 is sleeved on the first rod segment 114. A first protrusion 141 is located above the first sliding ring 1311, and its projection in the axial direction is such that the first protrusion 141 is located inside the first spring 151. In the first position, the first protrusion 141 presses the first sliding ring 1311 against the first step surface 1151, and the first spring 151 is in a stretched state. After the closure is completed, the closing rod 21 drives the first protrusion 141 to move away from the suture surface. The pressure of the first protrusion 141 on the first sliding ring 1311 is removed. Under the action of the first spring 151, the first sliding ring 1311 moves away from the suture surface, so that the first anvil 121 is folded in the opposite direction.

[0050] The second slide groove 114 spans the second rod segment 115, the third rod segment 116, and the fourth rod segment 117. A second stepped surface 1161 is formed between the second rod segment 115 and the third rod segment 116, and a third stepped surface 1171 is formed between the third rod segment 116 and the fourth rod segment 117. A second sliding ring 1321 is sleeved on the second rod segment 115, and a second spring 142 is sleeved on the second rod segment 115, the third rod segment 116, and the fourth rod segment 117. One end of the second spring 142 is fixed (e.g., welded) to the third stepped surface 1171, and the other end is fixed (e.g., welded) to the second sliding ring 1321. In the first position, the second spring 142 prevents the second sliding ring 1321 from moving away from the seam surface. In this embodiment, in the first position, the second sliding ring 1321 is also pressed against the second stepped surface 1161 by the first sliding ring 1311. In this embodiment, the extension rod 1314 extending from the first sliding ring 1311 toward the second sliding ring 1321, in the first position, since the first sliding ring 1311 is pressed against the first step surface 1151, the first sliding ring 1311, through the extension rod 1314, presses the second sliding ring 1321 against the second step surface 1161. In the axial projection direction, the projection of the second protrusion 152 is located inside the projection of the second spring 142, and the projection of the second protrusion 152 partially overlaps with the projection of the second sliding ring 1321. In the first position, the second protrusion 152 is located below the third step surface 1171. After closing, the closing rod 21 drives the second protrusion 152 to move away from the anvil surface. When it moves to the second step surface 1161, the second protrusion 152 abuts against the second sliding ring 1321, pushing the second sliding ring 1321 away from the anvil surface, so that the second anvil 122 folds in the opposite direction.

[0051] Please combine Figures 4 to 6 As mentioned above, the push rod 16 is mounted on the closing rod 21. In this embodiment, the push rod 16 and the closing rod 21 are connected by a plug-in joint, so that during surgery, the anvil assembly 100 and the stapler body can be placed into the human body separately, and then the anvil assembly 100 and the stapler body are connected inside the human body to facilitate the placement of the anvil assembly 100. Specifically, the staple cartridge assembly also includes a fixing sleeve 23 fixed inside the cartridge shell 22. When closed, part of the closing rod 21 and part of the anvil rod 11 are located inside the fixing sleeve 23. A positioning spring 24 is provided inside the fixing sleeve 23. The positioning spring 24 applies a force to the anvil rod 11 in the direction of the anvil plate 12. A locking structure for axially fixing the anvil rod 11 is provided between the anvil rod 11 and the fixing sleeve 23. See Figure 8 The locking structure includes a locking groove 1172 formed on the fourth rod section 117 and a spring piece 25 disposed in the fixed sleeve 23.

[0052] In this embodiment, a first insertion structure is provided between the push rod 16 and the closing rod 21, a docking rod 26 is provided inside the fixed sleeve 23, a second insertion structure is provided between the anvil rod 11 and the docking rod 26, the positioning spring 24 is located below the docking rod 26, and the anvil assembly 100 and the stapler body are docked through the first insertion structure and the second insertion structure.

[0053] Specifically, please combine Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8 The first insertion structure includes a plurality of retaining pieces 161 with hooks 162 extending downward from the bottom of the push rod 16 and an annular hook groove 211 formed on the closing rod 21. The plurality of retaining pieces 161 form an insertion cavity 163. After the end 212 of the closing rod 21 is inserted into the insertion cavity 163, the hooks 162 of the retaining pieces 161 cooperate with the annular hook groove 211 to achieve axial locking of the closing rod 21 and the push rod 16. In order to facilitate the insertion of the closing rod 21 into the insertion cavity 163, the end 212 of the closing rod 21 has a tapered structure. In addition, in order to prevent the closing rod 21 and the push rod 16 from separating after insertion, the anvil rod 11 and the docking rod 26 respectively form docking cavities for accommodating the closing rod 21 and the push rod 16 (which can be named the first docking cavity 119 formed on the anvil rod 11 and the second docking cavity 261 formed on the docking rod 26, respectively). When the anvil rod 11 and the fixed sleeve 23 are connected, the closing rod 21 and the pushing rod 16 are located in the connection cavity, thereby the side wall of the connection cavity restricts the movement of the retaining piece 161 outward, so as to prevent the closing rod 21 and the pushing rod 16 from separating.

[0054] It should be noted that, in order to prevent the closing rod 21 and the pushing rod 16 from moving away from the suture surface due to the force of the closing rod 21 before the closure is completed, thus preventing the closing rod 21 and the pushing rod 16 from aligning, especially if the closing rod 16 pushes the pushing rod into the first aligning cavity 119, the retaining piece 161 causes the first anvil piece 121 to fold in the opposite direction when the closing rod 21 and the pushing rod 16 are aligned, a retaining structure is provided between the first protrusion 141 and the anvil 11. The retaining structure includes a protrusion (not shown) formed on one of the first protrusion 141 and the anvil 11 and a groove (not shown) formed on the other. The retaining force between the protrusion and the groove is greater than the insertion force when the closing rod 21 and the pushing rod 16 are inserted.

[0055] The second insertion structure includes a first engagement portion 1173 formed on the end of the fourth rod segment 117 and a second engagement portion 262 formed on the docking rod 26 to engage with the first engagement portion 1173. The first engagement portion 1173 and the second engagement portion 262 achieve circumferential fixation of the anvil rod 11 and the docking rod 26. After the anvil rod 11 and the docking rod 26 are docked, the first insertion structure is accommodated within the docking cavity.

[0056] For ease of understanding, the reverse folding process of the reverse folding stapler in this embodiment is described below.

[0057] Please see Figure 5 When the anvil assembly 100 and the stapler are not docked, the annular hook groove 211 is located outside the first docking cavity 119. The docking rod 26 is held against the upper side of the fixed sleeve 23 by the positioning spring 24. Since a flange 263 is formed in the circumferential direction at the bottom of the docking rod 26, when the docking rod 26 is held against the upper side of the fixed sleeve 23, the flange 263 and the upper side wall 231 of the fixed sleeve 23 are held together to prevent the docking rod 26 from disengaging from the fixed sleeve 23.

[0058] When the anvil assembly 100 and the stapler body are initially docked, the end 212 of the closing rod 21 with the annular hook groove 211 is inserted into the insertion cavity 163. At this time, because the holding force between the protrusion and the groove is greater than the insertion force when the closing rod 21 and the push rod 16 are inserted, the closing rod 21 will not push the push rod 16 to move within the anvil rod 11. After the closing rod 21 and the push rod 16 are docked, the closing rod 21 is pulled. Because the first protrusion 141 on the push rod 16 abuts against the first step surface 1151, the closing rod 21 will drive the push rod 16 to move towards the suture surface, and will drive the anvil rod 11 to move towards the docking rod 26 until the first engagement part 1173 (see Figure 1 ) and the second meshing part 262 (see Figure 4During docking, the annular hook groove 211 enters the second docking cavity, and the initial docking is completed. Figure 6 As shown.

[0059] Continue pulling the closing lever 21 to drive the anvil lever 11 into the fixing sleeve 23 until the spring clip 25 on the fixing sleeve 23 is engaged in the locking groove 1172 on the anvil lever 11 (e.g. Figure 8 As shown), at this point, the anvil assembly 100 and the stapler body are closed. Figure 7 In this state, both the first anvil plate 121 and the second anvil plate 122 are in the first position.

[0060] Pushing the closing rod 21 towards the anvil 12, the anvil rod 11 will not move due to the cooperation of the locking groove 1172 and the spring piece 25. When the closing rod 21 moves towards the anvil 12, it will drive the pushing rod 16 to move in the same direction. Thus, the first protrusion 141 will no longer press against the first sliding ring 1311. Under the action of the first spring 151, the first sliding ring 1311 will move towards the anvil 12. Through the action of the first sliding ring 1311 and the first traction rod 1312, the first anvil 121 will fold in the opposite direction away from the suture surface, that is, the first anvil 121 will change from the first position to the second position. Figure 9 At this time, the second anvil 122 is still in the first position. After the first anvil 121 has been folded in the reverse direction (in the second position), the second protrusion 152 moves to below the second sliding ring 1321. It should be noted that after the first protrusion 141 moves, the extension rod 1314 of the first protrusion 141 (see...) Figure 1 The second sliding ring 1321 is no longer supported. However, the second sliding ring 1321 will not move at this time because it is limited by the second spring 142.

[0061] Continue pushing the closing rod 21, causing the second protrusion 152 to push the second sliding ring 1321 towards the anvil 12. At this time, the pushing force exerted by the second protrusion 152 on the second sliding ring 1321 is greater than the pulling force of the second spring 142. Through the action of the second sliding ring 1321 and the second traction rod 1322, the second anvil 122 is folded in the opposite direction away from the suture surface, that is, the second anvil 122 changes from the first position to the second position. Figure 10 Thus, all the anvils (first anvil 121 and second anvil 122) are folded in the opposite direction, and the annular hook groove 211 is located in the first docking cavity 119.

[0062] Please see Figure 11Another embodiment of this application shows a reverse-folding stapler with a structure largely the same as the reverse-folding stapler in the aforementioned embodiment, except that in this embodiment, the anvil assembly 100 is always connected to the stapler body. Specifically, the push rod and closing rod 21 are integrally formed (hereinafter usually the closing rod 21), the anvil rod 11 and the docking rod are integrally formed (hereinafter usually the anvil rod 11), and the anvil rod 11 does not have a docking cavity. The fixing sleeve 23 still has a positioning spring 24 and a spring piece 25. The positioning spring 24 abuts against the anvil rod 11 below, fixing it in the open state. After the anvil assembly 100 and the stapler body are closed, the spring piece 25 abuts against the flange 110 at the bottom of the anvil rod 11 to lock the anvil rod 11. The working process of the reverse-folding stapler in this embodiment is the same as that described above, except that the anvil assembly 100 and the stapler body do not need to be docked. Its working process is roughly as follows:

[0063] Pulling the closing rod 21 will cause the first protrusion 141 and the second protrusion 152 to abut against the anvil rod 11, so the closing rod 21 will drive the anvil rod 11 to move toward the suture surface until the anvil assembly 100 closes with the stapler body.

[0064] Push the closing rod 21 to move towards the anvil 12. At this time, the first protrusion 141 no longer presses against the first sliding ring 1311. Under the action of the first spring 151, the first sliding ring 1311 moves towards the anvil 12. Under the action of the first sliding ring 1311 and the first traction rod 1312, the first anvil 121 changes from the first position to the second position. In this state, the second protrusion 152 moves to below the second sliding ring 1321, while the second sliding ring 1321 has not yet moved under the action of the second spring 142.

[0065] Continue pushing the closing rod 21. At this time, the pushing force of the second protrusion 152 is greater than the pulling force of the second spring 142 on the second sliding ring 1321. The second protrusion 152 pushes the second sliding ring 1321 to move towards the anvil 12. Under the action of the second sliding ring 1321 and the second traction rod 1322, the second anvil 122 changes from the first position to the second position, and all anvils 12 complete the reverse folding. Figure 12 As shown.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A reverse-folding stapler, characterized in that, include: The stapler body includes a rod assembly, a staple cartridge assembly disposed on opposite sides of the rod assembly, and a gripping assembly, wherein the staple cartridge assembly has a suture surface; and An anvil assembly is disposed on the shaft assembly. The anvil assembly includes an anvil rod and an anvil plates pivotally connected to the anvil rod. A plurality of anvil plates are arranged circumferentially along the anvil rod. Each anvil plate has a plurality of nail holes formed thereon. The anvil plates switch between a first position and a second position under the drive of the shaft assembly. When the anvil is in the first position, the plane where the nail pit is located is perpendicular to the axis of the anvil rod; when the anvil is switched from the first position to the second position under the drive of the rod assembly, the anvil is folded away from the suture surface.

2. The reverse folding stapler as described in claim 1, characterized in that, The anvil is equipped with a traction component, which drives the anvil plate to switch between a first position and a second position under the action of the shaft assembly.

3. The reverse folding stapler as described in claim 2, characterized in that, The traction assembly includes a sliding ring sleeved on the anvil and a traction rod with its two ends hinged to the sliding ring and the anvil, respectively.

4. The reverse folding stapler as described in claim 3, characterized in that, The anvil is also provided with a stop structure and an actuation structure; wherein, at least one of the stop structure and the actuation structure is linked to the rod body assembly. When the anvil is in the first position, the stop structure applies a force to the sliding ring to keep the sliding ring stationary; the actuation structure applies a force to the sliding ring to move the sliding ring away from the suture surface, thereby driving the anvil to change from the first position to the second position.

5. The reverse folding stapler as described in claim 3, characterized in that, The nail pit is located on the outside of the hinged position between the anvil and the traction rod.

6. The reverse folding stapler as described in claim 4, characterized in that, The plurality of anvils include a plurality of first anvils and a plurality of second anvils spaced apart, and the anvil rod includes a first pivot portion pivotally connected to the first anvils and a second pivot portion pivotally connected to the second anvils, the first pivot portion and the second pivot portion being staggered in the axial direction of the anvil rod.

7. The reverse folding stapler as described in claim 6, characterized in that, The traction assembly includes a first traction assembly corresponding to the first anvil and a second traction assembly corresponding to the second anvil. The stop structure includes a first stop structure that applies force to the first traction assembly and a second stop structure that applies force to the second traction assembly. The actuation structure includes a first actuation structure that applies force to the first traction assembly and a second actuation structure that applies force to the second traction assembly. The first actuation structure and the second stop structure include springs sleeved on the anvil.

8. The reverse folding stapler as described in claim 7, characterized in that, The anvil is a hollow rod, and a first groove and a second groove are provided on the anvil, extending along the axis of the anvil. The first groove and the second groove are arranged vertically at intervals along the axis. A push rod is provided inside the anvil, and a first stop structure and a second actuation structure are formed on the push rod. The first stop structure is located in the first groove, and the second actuation structure is located in the second groove.

9. The reverse folding stapler as described in claim 8, characterized in that, The rod assembly includes a closing rod, and the push rod is disposed on the closing rod. The staple cartridge assembly includes a cartridge housing and a fixed sleeve fixed inside the cartridge housing. The closing rod and the anvil rod are located inside the fixed sleeve. A positioning spring is disposed inside the fixed sleeve. The positioning spring applies a force to the anvil rod in the direction of the anvil plate. A locking structure for axially fixing the anvil rod is disposed between the anvil rod and the fixed sleeve.

10. The reverse folding stapler as described in claim 9, characterized in that, A first insertion structure is provided between the push rod and the closing rod, a docking rod is provided inside the fixed sleeve, a second insertion structure is provided between the anvil rod and the docking rod, the positioning spring is located below the docking rod, and the anvil assembly and the stapler body are docked through the first insertion structure and the second insertion structure.

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