Surgical anastomat

Abstract

The utility model provides a surgical anastomat. According to the surgical anastomat, after percussion is completed, the cutter independently returns to the initial position of the cutter in the near-end direction and is separated from the percussion piece. The percussion piece leaves the percussion initial position, and the second tooth part does not abut against the percussion piece any more, so that the locking piece is switched to the locking position under the acting force of the force application piece. At this time, if the surgeon accidentally performs the firing operation, the knife is blocked by the first tooth part and cannot move from the initial position of the knife to the distal end direction, i.e., the secondary firing cannot be performed. Therefore, the surgical anastomat can prevent secondary percussion, and the safety risk is reduced. Through the first tooth part and the second tooth part, the locking piece can cooperate with the percussion piece and the cutter, and secondary percussion is effectively avoided. The locking piece with the structure is simple in structure and small in occupied space.

Description

Technical Field

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

[0002] Surgical staplers are widely used in various surgical procedures as an alternative to manual suturing. Surgical staplers typically have an end effector, which usually includes a cartridge, an anvil, a firing mechanism, and a cutting tool. As the firing mechanism moves distally along with the cutting tool, the staples in the cartridge are ejected by the firing mechanism and shaped under the guidance of the anvil, causing the tissue between the clamped anvil and cartridge to be cut by the cutting tool and sutured by the shaped staples. This process is called firing. After one firing, the cutting tool moves proximally back. Surgeons may misoperate, causing the returning cutting tool to be driven distally again. This process is called secondary firing. Secondary firing poses safety risks; for example, the re-expanded cutting tool may cut the tissue. Therefore, secondary firing should be avoided. Utility Model Content

[0003] In view of this, the present invention provides a surgical stapler designed to avoid secondary firing.

[0004] The surgical stapler provided in this embodiment includes a staple cartridge, a firing element, a cutting tool, and a locking mechanism. Staples are stored in the staple cartridge. The firing element moves distally from a firing initial position to eject the staples from the staple cartridge. The cutting tool moves distally from a cutting initial position to push the firing element away from the firing initial position, and then moves proximally to separate from the firing element. The locking mechanism includes a locking element and a force-applying element. The locking element includes a main body, a first tooth, and a second tooth. The main body is rotatably supported about an axis. The first and second teeth protrude radially outward from the main body and are spaced apart in a direction about the axis. The locking element rotates about the axis between a locked position and an unlocked position. The force-applying element applies a force to the locking element from the unlocked position to the locked position. When the firing element is in the firing initial position, the firing element at least partially abuts against the second tooth, causing the locking element to overcome the force-applying element and remain in the unlocked position. When the locking element is in the unlocked position, the first tooth avoids the cutting tool to allow the cutting tool to move distally from the cutting initial position. When the firing element leaves the initial firing position, it separates from the second tooth, and the force-applying element drives the locking element to switch to the locked position. When the locking element is in the locked position, the first tooth prevents the tool from moving from the initial tool position toward the distal end.

[0005] In some embodiments, the cutting tool includes a blade body and a shoulder. The shoulder is located on one side in the thickness direction of the blade body and protrudes beyond the side surface of the blade body. A locking mechanism is located on the same side in the thickness direction of the blade body as the shoulder. When the locking member is in the unlocked position, the first tooth is away from the blade body to be outside the first movement path of the shoulder in the distal direction. When the locking member is in the locked position, the first tooth is close to the blade body to be at least partially located in the first movement path and prevents the cutting tool from moving distally from its initial position by abutting against the shoulder.

[0006] In some embodiments, the first tooth portion has a first tooth surface. When the locking member is in the locked position, the first tooth surface is located on the proximal side of the first tooth portion. The distal side of the shoulder portion has a shoulder abutment surface. Both the first tooth surface and the shoulder abutment surface are flat surfaces. When the first tooth portion abuts against the shoulder, the first tooth surface and the shoulder abutment surface are in contact.

[0007] In some embodiments, when the locking member is in the locked position, both the first tooth surface and the shoulder abutment surface are substantially perpendicular to the near and far directions.

[0008] In some embodiments, the staple cartridge includes a staple cartridge housing. The staple cartridge housing includes a support portion and a first anti-rotation portion located radially outward of the support portion. A main body portion is rotatably supported on the support portion. A locking member rotates along a first direction from a locked position to an unlocked position. When the locking member is in the unlocked position, a first tooth at least partially abuts against the first anti-rotation portion to prevent the locking member from rotating from the unlocked position along the first direction.

[0009] In some embodiments, the first tooth portion has a first tooth surface, the shoulder portion has a shoulder abutment surface, and the first anti-rotation portion has a first anti-rotation abutment surface. The first tooth surface, the shoulder abutment surface, and the first anti-rotation abutment surface are all flat surfaces. When the shoulder portion abuts against the first tooth portion, the first tooth surface fits into the shoulder abutment surface. When the first tooth portion abuts against the first anti-rotation portion, the first tooth surface fits into the first anti-rotation abutment surface.

[0010] In some embodiments, the first tooth has a second tooth surface. The locking member rotates from a locked position to an unlocked position along a first direction. When the locking member is in the locked position, the second tooth surface is located on the distal side of the first tooth, and the distance from the second tooth surface to the tool body gradually decreases from the distal end to the proximal end of the second tooth surface, such that during the process of the tool returning from the distal side of the locking member to the initial tool position, the shoulder pushes the locking member to rotate along the first direction by contacting the second tooth surface, causing the first tooth to rotate along the first direction, allowing the tool to return to the initial tool position.

[0011] In some embodiments, the distance from the tip of the first tooth to the axis is greater than the distance from the cutter body to the axis. When the locking member is in the locked position, the tip of the first tooth is located on the proximal side of the axis.

[0012] In some embodiments, the tip of the first tooth has a third tooth surface. When the locking member is in the locked position, the third tooth surface abuts against a portion of the side surface of the cutter body. Both the third tooth surface and the portion of the side surface are flat surfaces.

[0013] In some embodiments, as the firing member moves proximally to the initial firing position, the firing member contacts at least a portion of the second tooth to push the locking member against the force-applying member and rotate from the locked position to the unlocked position.

[0014] In some embodiments, the surgical stapler further includes a staple cartridge housing. The staple cartridge housing includes a support portion and a second anti-rotation portion located radially outward of the support portion. The main body portion is rotatably supported on the support portion. A locking member rotates in a second direction from an unlocked position to a locked position. When the locking member is in the locked position, a second tooth abuts against the second anti-rotation portion to prevent the locking member from rotating in the second direction from the locked position.

[0015] In some embodiments, the second tooth portion has a fourth tooth surface, and the second anti-rotation portion has a second anti-rotation abutment surface, both of which are flat surfaces. When the locking member is in the locked position, the fourth tooth surface is in contact with the second anti-rotation abutment surface.

[0016] In some embodiments, the cutting tool includes a blade body and a shoulder, the shoulder being located on one side in the thickness direction of the blade body and protruding beyond the side surface of the blade body. The second tooth has a fifth tooth surface. When the locking member is in the unlocked position, the fifth tooth surface is located on the proximal side of the second tooth, and the distance from the fifth tooth surface to the blade body gradually decreases from the proximal end of the fifth tooth surface to the distal end of the fifth tooth surface.

[0017] In some embodiments, the second tooth is located distal to the first tooth in the proximal direction. The direction about the axis from the second tooth to the first tooth is the same as the direction of rotation of the locking member from the locked position to the unlocked position.

[0018] In some embodiments, the first tooth and the second tooth protrude beyond the main body along the axial direction to form a retaining groove between the first tooth and the second tooth. The force-applying element is a torsion spring, the outer arm of which extends into the retaining groove.

[0019] In some embodiments, the cutting tool includes a blade body and a shoulder, the shoulder being located on one side in the thickness direction of the blade body and protruding beyond the side surface of the blade body. As the cutting tool moves from the distal side of the locking member to the initial position of the cutting tool, the shoulder moves proximally along a second path. When the locking member is in the unlocked position, the second tooth is at least partially located in the second path. The locking member rotates from the unlocked position to the locked position along a second direction. When the locking member is in the unlocked position and the cutting tool is located on the distal side of the locking member, as the cutting tool moves proximally to the initial position of the cutting tool, the cutting tool drives the locking member to rotate in the second direction, causing the second tooth to move away from the blade body and out of the second path.

[0020] In some embodiments, a slope is provided on the proximal side of the shoulder, and the distance from the slope to the cutter body gradually decreases from the distal end of the slope to the proximal end. When the locking member is in the unlocked position and the cutter is on the distal side of the locking member, the slope contacts the second tooth as the cutter moves proximally to its initial position. At the contact point between the slope and the second tooth, the force exerted by the slope on the second tooth is located outside the line connecting the contact point and the axis.

[0021] In some embodiments, the cutting tool includes a blade body and two shoulders, which are located on opposite sides in the thickness direction of the blade body, protruding beyond the side surface of the blade body and arranged symmetrically relative to the blade body. The surgical stapler includes two locking mechanisms corresponding to the two shoulders, which are located on opposite sides in the thickness direction of the blade body and arranged symmetrically relative to the blade body. Each locking mechanism and its corresponding shoulder are located on the same side in the thickness direction of the blade body.

[0022] According to the surgical stapler provided in this embodiment, when the stapler is not fired, the firing element is in its initial firing position, and the firing element abuts against the second tooth, keeping the locking element in the unlocked position. At this time, if the surgeon performs a firing operation, the first tooth will not obstruct the blade, allowing the blade to move distally from its initial position to the distal end of the locking element under drive, pushing the firing element distally away from its initial firing position. After firing, the blade returns to its initial position proximally, separating from the firing element. Since the firing element leaves its initial firing position, the second tooth no longer abuts against the firing element, and the locking element switches to the locked position under the force of the force-applying element. At this time, if the surgeon accidentally performs a firing operation, the blade will be unable to move distally from its initial position to the distal end of the locking element because it abuts against the first tooth; that is, a secondary firing cannot be performed. Therefore, the surgical stapler can prevent secondary firing and reduce safety risks. Through the first and second teeth, the locking element works in conjunction with the firing element and the cutting tool to effectively prevent secondary firing. Locking elements with this structure are relatively simple and occupy less space. Attached Figure Description

[0023] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0024] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0025] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0026] Figure 1A and Figure 1BThis is a schematic diagram of the structure of a surgical stapler according to an embodiment of the present invention. Figure 1A In the middle, the end effector of the surgical stapler opens, in Figure 1B In the middle, the end effector is turned off.

[0027] Figure 2 yes Figure 1A An exploded view of the end effector of a surgical stapler.

[0028] Figure 3 yes Figure 2 A schematic diagram of the firing mechanism and cutting tool.

[0029] Figure 4 yes Figure 2 A schematic diagram of the locking mechanism in the diagram.

[0030] Figure 5 yes Figure 2 A schematic diagram of a portion of the stud cartridge shell.

[0031] Figure 6 yes Figure 2 A schematic diagram of a portion of the stud cartridge shell.

[0032] Figure 7 and Figure 8 yes Figure 2 A schematic diagram of a portion of the end effector, wherein the tool is in the initial position and the locking element is in the unlocked position.

[0033] Figure 9 yes Figure 2 A schematic diagram of a portion of the end effector, wherein the tool is located on the distal side of the locking member, and the locking member is in the locked position.

[0034] Figure 10 yes Figure 2 The diagram shows a portion of the end effector, where the tool is in the initial tool position and the locking element is in the locked position.

[0035] Figure 11 yes Figure 2 A schematic diagram of a portion of the end effector, in which the shoulder of the cutter abuts against the first tooth of the locking member.

[0036] Figure 12 and Figure 13 yes Figure 2 A schematic diagram of a portion of the end effector, in which the slope of the blade's shoulder contacts the second tooth of the locking member.

[0037] Figure 14 yes Figure 12 A magnified view of part A in the diagram.

[0038] Figure 15 yes Figure 13 A magnified view of part B in the diagram. Detailed Implementation

[0039] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0040] This utility model provides a surgical stapler 100. (See reference...) Figure 1A and Figure 1B The surgical stapler 100 may include an end effector 10 and a platform portion 20. The end effector 10 and the platform portion 20 may be connected via an elongated body 30. The end effector 10 may be connected to the distal end of the elongated body 30, and the platform portion 20 may be connected to the proximal end of the elongated body 30.

[0041] In this text, "far" and "proximal" can be relative to the surgeon. When the surgeon holds the surgical stapler 100, the end of the stapler 100 furthest from the surgeon can be called the distal end, and the end closest to the surgeon can be called the proximal end. The direction from the proximal end to the distal end of the stapler 100 can be called the distal direction, and the direction from the distal end to the proximal end of the stapler 100 can be called the proximal direction. For ease of understanding, in the accompanying figures, the distal direction is indicated by the arrow X+, and the proximal direction is indicated by the arrow X-. The distal and proximal directions can be collectively referred to as the proximal-distal direction.

[0042] Continue to refer to Figure 1A and Figure 1B The end effector 10 may include a staple cartridge 11 and an anvil 12, which are rotatably connected together to form a clamp-like structure. Through relative rotation, the staple cartridge 11 and anvil 12 can switch from a separated state to a close state. Figure 1A In the middle, the staple cartridge 11 and the anvil 12 are separated from each other, and the end anastomosis device 10 is open. Figure 1B In the middle, the staple cartridge 11 and the anvil 12 are in a state of close proximity to each other, and the end anastomosis device 10 is closed.

[0043] Reference Figure 2The end effector 10 may further include a cutter 13 and a firing element 14. The cutter 13 can be driven to move relative to the staple cartridge 11 in the proximal direction. As the cutter moves from its initial position to the distal side of the locking member 16, the cutter 13 pushes the firing element 14, causing the firing element 14 to move distally away from its initial firing position. As the firing element 14 moves distally away from its initial firing position, the staple 40 is ejected from the staple cartridge 11 by the firing element 14 and shaped under the guidance of the anvil 12, such that the tissue between the staple cartridge 11 and the anvil 12 is cut by the cutter 14 and sutured by the shaped staple 40.

[0044] As the cutting tool 13 moves from the distal end of the locking member 16 towards the proximal end, the cutting tool 13 separates from the firing member 14. By way of example only, the cutting tool 13 and the firing member 14 may not be connected; the cutting tool 13 can push the firing member 14 distally by abutting against it, so that the cutting tool 13 separates from the firing member 14 as it moves from the distal end of the locking member 16 towards the proximal end. By way of example only, refer to... Figure 3 The firing element 14 can be located at the distal end of the cutting tool 13. The cutting tool 13 can have an end face 131 facing the firing element 14, and the firing element 14 can have an end face 141 directly opposite the end face 131. During the movement of the cutting tool 13 from its initial position toward the distal end of the locking member 16, the end face 131 abuts against the end face 141 to push the firing element 14 toward the distal end. During the movement of the cutting tool 13 from the distal end of the locking member 16 toward the proximal end, the end face 131 separates from the end face 141, allowing the cutting tool 13 to move independently toward the proximal end.

[0045] To prevent secondary firing, refer to Figure 2 The end effector 10 may also include a locking mechanism 15. The locking mechanism 15 may include a locking element 16 and a force-applying element 17. (See reference) Figure 4 The locking member 16 may include a main body 161, a first tooth 163, and a second tooth 164. The main body 161 may be rotatably supported about axis S. The first tooth 163 and the second tooth 164 may protrude radially outward from the main body 161, and the first tooth 163 and the second tooth 164 may be spaced apart about axis S. The locking member 16 may rotate about axis S between a locked position and an unlocked position. The force-applying member 17 may apply a force to the locking member 16 from the unlocked position to the locked position.

[0046] For reference only. Figures 8 to 11 Along the proximal direction, the second tooth 164 can be located at the distal end of the first tooth 163. By way of example only, about axis S, the direction from the first tooth 163 to the second tooth 164 can be the same as the direction of rotation of the locking member 16 from the unlocked position to the locked position.

[0047] refer to Figure 8 When the firing element 14 is in the initial firing position, the firing element 14 at least partially abuts against the second tooth, causing the locking element 16 to overcome the force-applying element 17 and remain in the unlocked position. (Continue to refer to...) Figure 8 When the locking member 16 is in the unlocked position, the first tooth 163 avoids the cutter 13, allowing the cutter 13 to move from its initial position to the distal end of the locking member 16. (Reference) Figure 10 and Figure 11 When the firing element 14 leaves the initial firing position, it separates from the second tooth 164, causing the force-applying element 17 to drive the locking element 16 to switch to the locked position. (Continue to refer to...) Figure 10 and Figure 11 When the locking member 16 is in the locked position, the first tooth 163 blocks the movement of the tool 13 from the initial position to the distal end.

[0048] When the surgical stapler 100 is not fired, the firing element 14 is in its initial firing position, abutting against the second tooth 164 and holding the locking element 16 in the unlocked position. If the surgeon performs a firing operation at this time, the first tooth 163 will not obstruct the blade 13, allowing the blade 13 to move distally from its initial position towards the locking element 16 under drive, pushing the firing element 14 distally away from its initial firing position. After firing, the blade 13 returns proximally to its initial position, separating from the firing element 14. Since the firing element 14 has left its initial firing position, the second tooth 164 no longer abuts against it, and the locking element 16 switches to the locked position under the force of the force-applying element 17. If the surgeon accidentally performs a firing operation at this time, the blade 13 will be unable to move distally from its initial position towards the locking element 16 because it is abutting against the first tooth; that is, a second firing cannot be performed. Therefore, the surgical stapler 100 can prevent secondary firing and reduce safety risks. Through the first tooth 163 and the second tooth 164, the locking member 16 works in conjunction with the firing member 13 and the cutting tool 14 to effectively prevent secondary firing. The locking member 16 with this structure is relatively simple and occupies less space.

[0049] refer to Figure 2 The staple cartridge 11 may include a staple cartridge body 111 and a staple cartridge shell 112. The staples 40 can be housed in the staple cartridge body 111, while the staple cartridge body 111 can be supported by the staple cartridge shell 112 and partially enclosed by the staple cartridge shell 112. (Reference) Figure 5 and Figure 6 The staple cartridge housing 112 may be provided with a seat 113, and the locking mechanism 15 may be installed on the seat 113, which may be located at the proximal end of the staple cartridge housing 112. (Reference) Figure 3 and Figure 7The cutting tool 13 may include a blade body 132 and a shoulder 133. The shoulder 133 may be located on one side of the blade body 132 in the thickness direction and protrude beyond the side surface of the blade body 132. A locking member 16 may cooperate with the shoulder 133 to lock and unlock the cutting tool 132. The thickness direction of the blade body 132 may be perpendicular to the near-far direction, as indicated by arrows Y+ and Y- in the accompanying drawings.

[0050] refer to Figure 7 The cutting tool 13 may include two shoulders 133, the end effector 10 may include two locking mechanisms 15, and the cartridge housing 112 may have two seats 113. The two shoulders 133 may be located on opposite sides of the cutting tool body 132 in the thickness direction and are symmetrically arranged relative to the cutting tool body 132. Correspondingly, the two locking mechanisms 15 may be located on opposite sides of the cutting tool body 132 in the thickness direction and are symmetrically arranged relative to the cutting tool body 132. Correspondingly, the two seats 113 may be located on opposite sides of the cutting tool body 132 in the thickness direction and are symmetrically arranged relative to the cutting tool body 132. The shoulders 133, locking mechanisms 15, and locking mechanisms 16 located on the same side of the cutting tool body 132 in the thickness direction cooperate. On the one hand, the cooperation between the two locking members 16 and the two shoulders 133 makes the locking of the cutting tool 13 more reliable. On the other hand, when the cutting tool 13 contacts the two locking members 16, the forces exerted on the cutting tool 13 by the two locking members 16 in the thickness direction cancel each other out, ensuring that the cutting tool 13 is under balanced forces in the thickness direction.

[0051] The shoulder 133, locking mechanism 15, and seat 113 located on one side of the blade body 132 in the thickness direction will be described below as examples. It is understood that these descriptions also apply to the shoulder 133, locking mechanism 15, and lock seat 113 located on the other side of the blade body 132 in the thickness direction.

[0052] refer to Figure 4 and Figure 5 The seat 113 may include a support 114, which can support the main body 161, allowing the main body 161 to rotate about axis S, switching between a locked position and an unlocked position. In some examples, see reference... Figure 4 and Figure 5 The main body 161 may be provided with a shaft hole 162, and the support part 114 may be a support shaft 114 defining the axis S. The support shaft 114 may extend into the shaft hole 162 to rotatably support the main body 161. It is understood that in some other examples, the main body 161 may be a shaft defining the axis S, and the support part 114 may be provided with a shaft hole.

[0053] As the cutting tool 13 moves from its initial position to the distal end of the locking member 16, the shoulder 13 moves distally along the first path. (Reference) Figure 8When the locking member 16 is in the unlocked position, the first tooth 163 is away from the blade body 132, so that a first gap G1 is formed between the locking member 16 and the blade body 132, allowing the shoulder 133 to pass through. That is, when the locking member 16 is in the unlocked position, the first tooth 163 is far enough away from the blade body 132 to be outside the first path of the shoulder 133 moving distally, so that it does not obstruct the movement of the shoulder 133 distally during the movement of the blade 13 from its initial position to the distal side of the locking member 16.

[0054] refer to Figure 10 and Figure 11 When the locking member 16 is in the locked position, the first tooth 163 approaches the cutter body 132, closes or reduces the first gap G1, and is located on the first path of the shoulder 133 moving in the distal direction. This causes the first tooth 16 to abut against the shoulder 133 when the cutter 132 moves from the initial position to the distal direction, thereby preventing the cutter 132 from moving from the initial position to the distal side of the locking member 16, thus avoiding secondary firing and reducing safety risks.

[0055] The locking member 16 switches between an unlocked position and a locked position by rotation. Rotation of the locking member 16 changes the distance between the first tooth 163 and the cutter body 132, allowing the first tooth 163 to selectively block or not block the shoulder 133, thereby unlocking and locking the cutter 132. The locking member 16 with this structure is relatively simple and occupies less space.

[0056] Continue to refer to Figure 10 and Figure 11 The first tooth 163 may have a first tooth surface 1631, and the distal end of the shoulder 133 may have a shoulder abutment surface 134. Both the first tooth surface 1631 and the shoulder abutment surface 134 may be flat surfaces. When the locking member 16 is in the locked position and the cutting tool 13 is in the initial cutting tool position, such as Figure 10 As shown, the first tooth surface 1631 can be located on the proximal side of the first tooth portion 163, directly opposite the abutment surface 134. When the shoulder portion 133 abuts against the first tooth portion 163, as... Figure 11 As shown, the first tooth surface 1631 and the shoulder abutment surface 134 can be fitted together. That is, the shoulder 133 and the first tooth 163 can abut against each other through the first tooth surface 1631 and the shoulder abutment surface 134.

[0057] Both the first tooth surface 1631 and the shoulder abutment surface 134 are flat surfaces, and they fit together when abutting. Therefore, the contact between the shoulder 133 and the first tooth 163 during abutment is the contact between two flat surfaces. The contact between flat surfaces can withstand greater clamping force, reducing the risk of crushing at the contact area between the shoulder 133 and the first tooth 163, thereby improving the reliability and service life of the surgical stapler 100.

[0058] Further reference Figure 10 and Figure 11 When the locking member 16 is in the locked position, the first tooth surface 1631 and the shoulder abutment surface 134 can both be substantially perpendicular to the near and far directions. In this disclosure, substantially perpendicular means not absolutely perpendicular; appropriate errors, such as ±5 degrees, should be allowed. According to this configuration, when the shoulder 133 and the first tooth 163 abut, the pressure on the first tooth surface 1631 and the shoulder abutment surface 134 has a larger component in the near and far directions and a smaller component in other directions. On the one hand, this helps reduce the risk of accidental disengagement of the shoulder 133 and the first tooth 163, ensuring reliable abutment between them. On the other hand, this allows the tool 13 to remain stable in the thickness direction, without deformation or displacement under the influence of the component force in the thickness direction.

[0059] refer to Figure 5 The seat portion 113 may further include a first anti-rotation portion 115, which may be located radially outward of the support portion 114. (See reference) Figure 8 When the locking member 16 is in the unlocked position, the first tooth 163 can at least partially abut against the first anti-rotation part 115 to prevent the locking member 16 from rotating from the unlocked position along the first direction R1. Here, the first direction R1 is the direction in which the locking member 16 rotates from the locked position to the unlocked position. With this configuration, the first tooth 163 can both abut against the shoulder 133 to lock the tool 13 and abut against the first anti-rotation part 115 to help hold the locking member 16 in the unlocked position. The same first tooth 163 plays different roles in the unlocked and locked positions, which helps to reduce the structural complexity of the locking member 16.

[0060] refer to Figure 5 The first anti-rotation part 115 may have a first anti-rotation abutment surface 116, and the first anti-rotation abutment surface 116 may be a flat surface. For example... Figure 8 As shown, when the first tooth 163 abuts against the first anti-rotation part 115, that is, when the locking member 16 is in the unlocked position, the first tooth surface 1631 fits against the first anti-rotation abutment surface 116. In other words, the first tooth 163 and the first anti-rotation part 115 can abut against each other through the first tooth surface 1631 and the first anti-rotation abutment surface 116.

[0061] Both the first tooth surface 1631 and the first anti-rotation abutment surface 116 are flat surfaces, and they fit together when abutting. Therefore, the contact between the first tooth 163 and the first anti-rotation part 115 is the contact between two flat surfaces. The contact between flat surfaces can withstand greater clamping force, reducing the risk of crushing at the contact area between the first tooth 163 and the first anti-rotation part 115, thereby improving the reliability and service life of the surgical stapler 100. In addition, the first tooth 163 abuts against both the shoulder 133 and the first anti-rotation part 115 via the first tooth surface 1631. The same first tooth surface 1631 plays different roles in the unlocked and locked positions, which helps to reduce the structural complexity of the first tooth 163.

[0062] refer to Figure 8 and Figure 9 As the cutting tool 13 moves distally, the shoulder 133 moves from the proximal side of the locking member 16 to its distal side, and the locking member 16 rotates from the unlocked position to the locked position under the action of the force-applying member 17. At this time, the first tooth 163 will at least partially enter the second path of the shoulder 133 moving proximally. To ensure that the cutting tool 13 can return to its initial position, the first tooth 163 may also have a second tooth surface 1632. Figure 9 As shown, when the locking member 16 is in the locked position, the second tooth surface 1632 can be located at the distal end of the first tooth portion 163, and the distance from the second tooth surface 1632 to the cutter body 132 can gradually decrease from the distal end of the second tooth surface 1632 to its proximal end. Thus, referring to... Figure 9 and Figure 10 During the process of the tool 13 returning from the distal side of the locking member 16 to the initial position of the tool, the shoulder 133 can push the locking member 16 to rotate in the first direction against the force application member 17 by contacting the second tooth surface 1632, so that the first tooth 163 moves away from the tool body 132, allowing the tool 13 to return to the distal side of the locking member 16 with less resistance.

[0063] refer to Figure 11 The distance from the tooth tip 1633 of the first tooth 163 to the axis S can be greater than the distance from the cutter body 132 to the axis S. (Continue to refer to...) Figure 11 When the locking member 16 is in the locked position, the tooth tip 1633 of the first tooth 163 can be located on the proximal side of the axis S. According to this configuration, as... Figure 11As shown, when the shoulder 133 abuts against the first tooth 163, the tooth tip 1633 tends to move distally under the force from the shoulder 133. Since the distance from the tooth tip 1633 to the axis S can be greater than the distance from the blade body 132 to the axis S, the tooth tip 1633 will abut against the blade body 132. The abutment between the blade body 132 and the tooth tip 1633 will create a force that prevents the locking member 16 from continuing to rotate in the second direction R2, thereby keeping the locking member 16 in the locked position and preventing secondary firing. Here, the second direction R2 is the direction in which the locking member 16 rotates from the unlocked position to the locked position.

[0064] Furthermore, continuing with reference to 11, the tooth tip 1633 of the first tooth portion 163 may have a third tooth surface 1634. For example... Figure 11 As shown, when the locking member 16 is in the locked position, the third tooth surface 1634 can abut against a portion of the side surface of the blade body 132. Here, both the third tooth surface 1634 and the portion of the side surface of the blade body 132 that abut against it can be flat surfaces. Since both the third tooth surface 1634 and the portion of the blade body 132 that abut against it are flat surfaces, they are pressed together when in contact. Therefore, the contact between the first tooth 163 and the blade body 132 during contact is a contact between two flat surfaces. The contact between flat surfaces can withstand greater clamping force, reducing the risk of the contact area between the first tooth 163 and the blade body 132 being crushed, thereby improving the reliability and service life of the surgical stapler 100.

[0065] For reference only. Figure 4 The first tooth 163 and the second tooth 164 protrude beyond the main body 161 along the extension direction of the axis S, forming a retaining groove 165 between them. The force-applying element 17 can be a torsion spring 17, and one outer arm 171 of the torsion spring 17 can extend into the tool retaining groove 165. This configuration utilizes the retaining groove 165 formed by the gap between the first tooth 163 and the second tooth 164, eliminating the need for additional structures to fix the outer arm 171, thus helping to reduce the structural complexity of the locking element 16. The extension direction, the near and far directions of the axis S, and the thickness direction of the tool 132 can be perpendicular to each other. For ease of understanding, the extension direction of the axis S is indicated by arrows Z+ and Z- in the accompanying drawings.

[0066] refer to Figure 2After firing, the staple 40 in the staple cartridge body 111 is ejected. If the surgical stapler 100 needs to be used again, the staple cartridge body 111 should be replaced. During the replacement operation, the staple cartridge body 111 and the firing element 14 are replaced as a whole. In the new whole, the firing element 14 is still located in the fixed position of the staple cartridge body 111, that is, the initial firing position. It can be understood that the initial firing position of the firing element 14 is the position of the firing element 14 relative to the staple cartridge body 111, and also the position of the firing element 14 relative to the staple cartridge housing 112 when the whole is installed to the staple cartridge housing 112. According to the embodiment of the present invention, during the process of the firing element 14 moving proximally to the initial firing position, the firing element 14 at least partially contacts the second tooth 164 to push the locking element 16 against the force application element 17 and rotate from the locked position to the unlocked position. In this way, a simple replacement operation can simultaneously switch the locking element 16 to the unlocked position, preparing for the re-firing of the surgical stapler 100, without requiring an additional unlocking operation. Therefore, this method helps reduce operational complexity.

[0067] refer to Figure 5 The seat portion 113 may further include a second anti-rotation portion 117, which may be located radially outward of the support portion 114. (See reference) Figure 11 When the locking member 16 is in the locked position, the second tooth 164 abuts against the second anti-rotation part 117 to prevent the locking member 16 from rotating further in the second direction R2 from the locked position. With this configuration, the second tooth 164 can both hold the locking member 16 in the unlocked state by abutting against the firing member 14, and can switch the locking member 16 to the unlocked state under the push of the firing member 14 returning to the initial firing position, and can also hold the locking member 16 in the locked position by abutting against the second anti-rotation part 117. The same second tooth 164 can perform multiple different functions, which helps to reduce the structural complexity of the locking member 16.

[0068] Continue to refer to Figure 11 In a particular example, the distance from the tooth tip 1633 of the first tooth 163 to the axis S can be greater than the distance from the cutter body 132 to the axis S. When the locking member 16 is in the locked position, the tooth tip 1633 of the first tooth 163 is located near the axis S, while the second tooth 164 abuts against the second anti-rotation part 117. In this way, the abutment of the second tooth 164 against the second anti-rotation part 117 and the abutment of the tooth tip 1633 against the cutter body 132 will jointly bear the force of the locking member 16 rotating in the second direction R2, thereby reducing the risk of damage and increasing service life.

[0069] refer to Figure 5 and Figure 11The second anti-rotation portion 117 may have a second anti-rotation abutment surface 118, and the second tooth portion 164 may have a fourth tooth surface 1641. The second anti-rotation abutment surface 117 and the fourth tooth surface 1641 may all be flat surfaces. For example... Figure 11 As shown, when the locking member 16 is in the locked position, the fourth tooth surface 1641 can abut against the second anti-rotation abutment surface 118. That is, the second anti-rotation part 117 and the second tooth part 164 can abut against each other through the second anti-rotation abutment surface 118 and the fourth tooth surface 1641.

[0070] Both the second anti-rotation abutment surface 118 and the fourth tooth surface 1641 are flat surfaces, and they fit together during contact. Therefore, the contact between the second anti-rotation part 117 and the second tooth 164 during contact is the contact between two flat surfaces. The contact between flat surfaces can withstand greater clamping force, reducing the risk of the contact area between the second anti-rotation part 117 and the second tooth 164 being crushed during contact, thereby improving the reliability and service life of the surgical stapler 100.

[0071] refer to Figure 8 The second tooth 164 may also have a fifth tooth surface 1642. For example... Figure 8 As shown, when the locking member 16 is in the unlocked position, the fifth tooth surface 1642 can be located on the proximal side of the second tooth portion 164, and the distance from the fifth tooth surface 1642 to the blade body 132 gradually decreases from the proximal end to the distal end of the fifth tooth surface 1642. Under normal circumstances, as the blade 13 moves towards the distal end, the blade 13 pushes the firing member 14 away from the initial firing position. During this process, the locking member 16 moves in the second direction under the action of the force-applying member 17, the first tooth portion 163 approaches the blade body 132, the second tooth portion 164 moves away from the blade body 132, and the shoulder portion 133 passes through the gap between the first tooth portion 163 and the blade body 132 and the gap between the second tooth portion 164 and the blade body 132. In actual surgical procedures, due to the accumulation and compression of tissue remnants, the rotation of the locking member 16 may unexpectedly become stuck. In this case, as the tool 13 moves from the initial tool position to the distal side of the locking member 16, the shoulder 133 can push the locking member 16 to rotate in the second direction by contacting the fifth tooth surface 1642, so that the tool 13 can move from the initial tool position to the distal side of the locking member 16 with less resistance.

[0072] Under normal circumstances, such as Figure 9 As shown, the cutting tool 13 passes the locking member 16 in the distal direction, and the locking member 16 rotates to the locked position under the action of the force-applying member 17. In the locked position, the second tooth 164 is far from the tool body 132, forming a second gap G2 that allows the shoulder 133 to pass through. The locking member 16 is stuck, so that when the cutting tool 13 is on the distal side of the locking member 16, the locking member 16 is in the unlocked position. Figure 12This situation is illustrated. For example... Figure 12 As shown, in this case, the second tooth 164 is at least partially located in the second path in which the shoulder 133 moves proximally. In this case, if the tool 13 returns to the initial tool position from the distal side of the locking member 16, the second tooth 164 will block the shoulder 133, thereby preventing the tool 13 from returning to the initial tool position.

[0073] To address this situation, according to an embodiment of the present invention, reference is made to... Figures 12 to 15 When the locking member 16 is in the unlocked position, as the cutting tool 13 moves from the distal end of the locking member 16 to the initial position, the cutting tool 13 drives the locking member 16 to rotate in the second direction, causing the second tooth 164 to leave the shoulder 133 and move along the second path from the proximal end. Thus, when the cutting tool 13 returns from the distal end of the locking member 16 to the initial position, even if the locking member 16 is stuck in the unlocked position, the cutting tool 13 can still push the locking member 16 to rotate in the second direction, ensuring that the second tooth 164 does not obstruct the shoulder 133, and guaranteeing that the cutting tool 13 can smoothly return to the initial position.

[0074] As an example, continue to refer to Figures 12 to 15 The proximal side of the shoulder 133 may be provided with a slope 135, and the distance from the slope 135 to the cutter body 132 gradually decreases from the distal end of the slope 135 to the proximal end of the slope 135. In one example, the slope 135 can be a plane. In another example, the slope 135 can be a curved surface. When the cutter 13 is located on the distal side of the locking member 16 and the locking member 16 is in the unlocked position, as the cutter 13 moves from the distal side of the locking member 16 to the initial position of the cutter, the slope 135 contacts the second tooth 164. At the contact point P between the slope 135 and the second tooth 164, the force F exerted by the slope 135 on the second tooth 164 is located outside the line connecting the contact point P and the axis S. That is, the angle α between the force F and the cutter body 132 is greater than the angle β between the line connecting the contact point P and the axis S and the cutter body 132. According to this configuration, as Figures 12 to 15 As shown, the force F has a component Fn pointing towards the axis S and a component Ft perpendicular to the component Fn. The direction of the component Ft is consistent with the tangential direction when the contact point P rotates in the second direction, so as to drive the second tooth 164 to rotate in the second direction and move away from the second path of the shoulder 133 towards the proximal end.

[0075] return Figure 1A and Figure 1BPlatform 20 may include a grip 21 and a trigger 22. The surgeon can grip the grip 21 to pick up the surgical stapler 100. The surgeon can activate the surgical stapler 100 by pulling the trigger 22. As the surgeon pulls the trigger 22, power is transmitted from platform 20 to end effector 10, which in turn moves the blade 13 from its initial position toward the distal end of locking member 16. In one example, the surgical stapler 100 may be a manual stapler, meaning the power to move the blade 13 distally may come directly from the surgeon's hand. In another example, the surgical stapler 100 may be an electric stapler, where the power to move the blade 13 distally may come from an electric motor mounted in platform 20.

[0076] The above provides illustrative examples of the surgical stapler according to embodiments of the present invention. It is understood that the above description only covers a portion of, and not all, embodiments of the present invention. For example, in some embodiments, a shoulder may be provided only on one side of the blade, correspondingly, there is only one locking mechanism and one seat. As another example, in some embodiments, when the blade is located at the distal end of the locking member 16 and the locking member is in the unlocked position, as the blade moves proximally, the blade can drive a rack to move, and the rack can further drive a gear engaged with the locking member's anti-rotation mechanism, thereby driving the locking member to move in the first direction. As yet another example, in some embodiments, the force-applying element can be implemented as a tension spring, a compression spring, or a magnetic element.

[0077] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0078] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0079] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first tooth surface and the second tooth surface), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0080] The basic principles of this utility model have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this utility model are merely examples and not limitations, and should not be considered as essential features of each embodiment of this utility model. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the utility model from being implemented using the aforementioned specific details.

[0081] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A surgical stapler, characterized by, Comprising: a cartridge in which staples are stored; a firing member that moves in a distal direction from a firing start position to push the staples out of the cartridge; a knife that moves in the distal direction from a knife start position to push the firing member away from the firing start position, the knife moving in a proximal direction to disengage from the firing member; and a lockout mechanism including a lockout and an urging member, the lockout including a body portion rotatably supported about an axis, first and second tooth portions projecting radially outwardly from the body portion and spaced apart in a direction about the axis, the lockout rotating about the axis between a lockout position and an unlock position, the urging member applying a force to the lockout from the unlock position to the lockout position; when the firing member is in the firing start position, the firing member at least partially abuts the second tooth portion such that the lockout remains in the unlock position against the urging member, when the lockout is in the unlock position, the first tooth portion clears the knife to allow the knife to move in the distal direction from the knife start position; when the firing member is moved away from the firing start position, the firing member disengages from the second tooth portion, the urging member driving the lockout to switch to the lockout position, when the lockout is in the lockout position, the first tooth portion blocks the knife from moving in the distal direction from the knife start position.

2. The surgical stapler according to claim 1, wherein, the knife includes a knife body and a shoulder portion projecting beyond a side surface of the knife body on one side in a thickness direction of the knife body, the lockout mechanism is on the same side of the knife body as the shoulder portion in the thickness direction of the knife body; when the lockout is in the unlock position, the first tooth portion is distal to the knife body to be outside a first movement path of the shoulder portion moving in the distal direction; when the lockout is in the lockout position, the first tooth portion is proximal to the knife body to be at least partially in the first movement path and blocks the knife from moving in the distal direction from the knife start position by abutting against the shoulder portion.

3. The surgical stapler according to claim 2, wherein, the first tooth portion is provided with a first tooth surface that is proximal to the first tooth portion when the lockout is in the lockout position, a distal side of the shoulder portion is provided with a shoulder abutment surface, the first tooth surface and the shoulder abutment surface are flat surfaces; when the first tooth portion abuts against the shoulder portion, the first tooth surface and the shoulder abutment surface are in contact.

4. The surgical stapler according to claim 3, wherein, when the lockout is in the lockout position, the first tooth surface and the shoulder abutment surface are substantially perpendicular to a proximal-distal direction.

5. The surgical stapler according to claim 2, wherein, the cartridge includes a cartridge housing including a support portion and a first rotation stop portion radially outward of the support portion, the body portion is rotatably supported on the support portion, the lockout rotates in a first direction from the lockout position to the unlock position; When the locking member is located at the unlocking position, the first tooth portion is at least partially abutted against the first rotation-stopping portion to prevent the locking member from rotating in the first direction from the unlocking position.

6. The surgical stapler according to claim 5, wherein, The first tooth portion is provided with a first tooth surface, the shoulder portion is provided with a shoulder abutting surface, and the first rotation-stopping portion is provided with a first rotation-stopping abutting surface, and the first tooth surface, the shoulder abutting surface, and the first rotation-stopping abutting surface are all flat surfaces. When the shoulder portion is abutted against the first tooth portion, the first tooth surface is fitted with the shoulder abutting surface; and when the first tooth portion is abutted against the first rotation-stopping portion, the first tooth surface is fitted with the first rotation-stopping abutting surface.

7. The surgical stapler according to claim 2, wherein, The first tooth portion is provided with a second tooth surface, and the locking member is rotated in a first direction from the locking position to the unlocking position. When the locking member is located at the locking position, the second tooth surface is located at a distal side of the first tooth portion, and a distance from the second tooth surface to the tool body gradually decreases from a distal end of the second tooth surface to a proximal end of the second tooth surface, so that, in a process in which the tool returns to the initial position of the tool from a distal side of the locking member, the shoulder portion pushes the locking member to rotate in the first direction by being in contact with the second tooth surface, so that the first tooth portion is rotated in the first direction to allow the tool to return to the initial position of the tool.

8. The surgical stapler according to claim 2, wherein, A distance from a tooth top of the first tooth portion to the axis is greater than a distance from the tool body to the axis. When the locking member is located at the locking position, the tooth top of the first tooth portion is located at a proximal side of the axis.

9. The surgical stapler according to claim 8, wherein, The tooth top of the first tooth portion is provided with a third tooth surface, and the third tooth surface is fitted with a partial side surface of the tool body when the locking member is located at the locking position, and the third tooth surface and the partial side surface are both flat surfaces.

10. The surgical stapler according to claim 1, wherein, In a process in which the firing member moves to the initial position of the firing in the proximal direction, the firing member is in contact with at least part of the second tooth portion to push the locking member to rotate from the locking position to the unlocking position against the biasing member.

11. The surgical stapler according to claim 1, wherein, Further comprising a staple cartridge shell including a support portion and a second rotation-stopping portion located at a radially outer side of the support portion, and the main body portion is rotatably supported on the support portion, and the locking member is rotated in a second direction from the unlocking position to the locking position. When the locking member is located at the locking position, the second tooth portion is abutted against the second rotation-stopping portion to prevent the locking member from rotating in the second direction from the locking position.

12. The surgical stapler according to claim 11, wherein, The second tooth portion is provided with a fourth tooth surface, the second rotation-stopping portion is provided with a second rotation-stopping abutting surface, and the fourth tooth surface and the second rotation-stopping abutting surface are both flat surfaces; and when the locking member is located at the locking position, the fourth tooth surface is fitted with the second rotation-stopping abutting surface.

13. The surgical stapler according to claim 1, wherein, The tool includes a tool body and a shoulder part located on one side of the tool body in the thickness direction and protruding beyond the side surface of the tool body, and the second tooth part has a fifth tooth surface; when the locking member is in the unlocked position, the fifth tooth surface is located on the proximal side of the second tooth part, and the distance from the fifth tooth surface to the tool body gradually decreases from the proximal end of the fifth tooth surface to the distal end of the fifth tooth surface.

14. The surgical stapler according to claim 1, wherein, The second tooth part is located on the distal side of the first tooth part in the proximal-distal direction, and the direction from the second tooth part to the first tooth part around the axis is the same as the rotation direction of the locking member from the locked position to the unlocked position.

15. The surgical stapler according to claim 1, wherein, The first tooth part and the second tooth part protrude beyond the main body part in the extension direction of the axis to form a fixing groove between the first tooth part and the second tooth part; the force applying member is a torsion spring, and the outer arm of the torsion spring extends into the fixing groove.

16. The surgical stapler according to any one of claims 2 to 15, wherein, The tool includes a tool body and a shoulder part located on one side of the tool body in the thickness direction and protruding beyond the side surface of the tool body, and the second tooth part has a fifth tooth surface; when the locking member is in the unlocked position, the fifth tooth surface is located on the proximal side of the second tooth part, and the distance from the fifth tooth surface to the tool body gradually decreases from the proximal end of the fifth tooth surface to the distal end of the fifth tooth surface. The locking member is rotated from the unlocked position to the locked position in a second direction; When the locking member is in the unlocked position and the tool is located on the distal side of the locking member, as the tool moves to the initial position of the tool in the proximal direction, the tool drives the locking member to rotate in the second direction, so that the second tooth part moves away from the tool body and out of the second path.

17. The surgical stapler according to claim 16, wherein, The proximal side of the shoulder part is provided with a slope surface, and the distance from the slope surface to the tool body gradually decreases from the distal end of the slope surface to the proximal end of the slope surface; When the locking member is in the unlocked position and the tool is located on the distal side of the locking member, as the tool moves to the initial position of the tool in the proximal direction, the slope surface contacts the second tooth part; At the contact point of the slope surface and the second tooth part, the force applied by the slope surface to the second tooth part is located on the outer side of the line connecting the contact point and the axis.

18. The surgical stapler according to any one of claims 2 to 15, wherein, The tool includes a tool body and two shoulder parts located on opposite sides of the tool body in the thickness direction and protruding beyond the side surface of the tool body, and the two shoulder parts are symmetrically arranged relative to the tool body; the surgical anastomat includes two locking mechanisms corresponding to the two shoulder parts respectively, and the two locking mechanisms are located on opposite sides of the tool body in the thickness direction and are symmetrically arranged relative to the tool body; each locking mechanism and the corresponding shoulder part are located on the same side of the tool body in the thickness direction.

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