Bottom cap, staple cartridge assembly, end effector, and surgical stapler

Abstract

The present disclosure provides a bottom cover, a staple cartridge assembly, an end effector and a surgical stapler. According to the bottom cover provided by the present disclosure, the retaining portion is connected with the side wall through two end portions opposite in a first direction, and the edge of the retaining portion opposite in a second direction is spaced from the wall body. This makes the retaining portion itself have better elastic deformation capability, so as to be able to provide a larger elastic deformation amount and better adapt to and absorb the deformation of the staple cartridge assembly. Since the elastic deformation capability of the retaining portion itself is better, the retaining portion will be able to be given a larger bulging height. Before firing, when the width of the staple cartridge assembly is small, the retaining portion with a higher bulging height can effectively prevent the staple cartridge assembly from accidentally falling off the staple cartridge seat. After firing, although the width of the staple cartridge assembly increases, due to the better elastic deformation capability of the retaining portion itself, the increased width of the staple cartridge assembly will be compensated by the elastic deformation of the retaining portion, ensuring that the disassembly operation can be more easily achieved.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and in particular to a bottom cover, a staple cartridge assembly, an end effector, and a surgical stapler. Background Technology

[0002] Surgical staplers are clinically used devices that replace traditional manual suturing. Compared to traditional manual suturing, the use of surgical staplers can improve the speed of tissue suturing and reduce trauma to the patient. A surgical stapler includes an end effector, which comprises a staple cartridge and an anvil, with the cartridge containing a staple cartridge assembly. During surgery, the staples in the staple cartridge assembly are advanced and shaped under the guidance of the anvil, thereby suturing the tissue between the cartridge and the anvil; this process is called firing. The cartridge includes a cartridge seat and a staple cartridge assembly detachably attached thereto, in which the staples are housed.

[0003] In surgical procedures, multiple staple cartridge assemblies are typically used to complete the treatment, depending on the lesion and tissue. Therefore, in some types of surgical staplers, when the staples are exhausted, the used staple cartridge assembly needs to be removed from the stapler housing and the unused assembly installed. This requires the staple cartridge assembly to be reliably attached to the stapler housing before firing and easily removed and replaced after firing.

[0004] However, with conventional surgical staplers, either the stapler assembly is prone to detaching from the stapler housing before firing, or it is difficult to remove the stapler assembly from the stapler housing after firing. In other words, conventional surgical staplers face the dual challenges of the stapler assembly being prone to detachment before firing and difficult to disassemble after firing. Utility Model Content

[0005] In view of this, the present invention provides a bottom cover, a staple cartridge assembly, an end effector, and a surgical stapler, aiming to solve the problems of the staple cartridge assembly being easy to fall off before firing and the staple cartridge assembly being difficult to disassemble after firing in previous surgical staplers.

[0006] On the one hand, this disclosure provides a bottom cover for a staple cartridge assembly.

[0007] The staple cartridge assembly includes a cartridge body and a bottom cover, the bottom cover being adapted to attach to the cartridge body and cover the bottom of the cartridge body. The bottom cover includes a bottom wall and two side walls. The two side walls extend upward from the bottom wall and are arranged opposite each other in the width direction. Each side wall includes a wall body and a retaining portion that protrudes outward from the wall body in the width direction. The retaining portion includes two ends opposite each other in a first direction and two edges opposite each other in a second direction, wherein the first direction is perpendicular to the second direction. The two ends are connected to the wall body, and the two edges are spaced apart from the wall body.

[0008] The position of the firing element changes before and after firing, causing a change in the width of the staple cartridge assembly. Specifically, after firing, the firing element moves to the distal end, applying outward compressive force to the staple cartridge assembly, making the width of the assembly, especially near the distal end, larger than before firing. In conventional bottom covers, the entire outer periphery of the retainer is connected to the sidewall, resulting in poor elastic deformation capacity of the retainer itself. When the retainer is compressed, elastic deformation mainly occurs on the sidewall, which also has poor elastic deformation capacity. This leads to poor adaptability of conventional staple cartridge assemblies to changes in width. If the height of the retainer's bulge is small, the staple cartridge assembly is at risk of detachment when not fired. Conversely, if the height of the retainer's bulge is large, disassembly becomes difficult after firing due to the increased width of the staple cartridge assembly.

[0009] According to the bottom cover provided in this disclosure, the retaining part is connected to the sidewall via two opposite ends along a first direction, and the retaining part is spaced apart from the wall along opposite edges along a second direction. This gives the retaining part itself better elastic deformation capability, thereby providing a larger elastic deformation and better adapting to and absorbing the deformation of the staple cartridge assembly. Due to the better elastic deformation capability of the retaining part itself, the retaining part can be given a larger bulge height. Before firing, when the width of the staple cartridge assembly is small, the higher bulge of the retaining part can effectively prevent the staple cartridge assembly from accidentally falling off the staple cartridge seat. After firing, although the width of the staple cartridge assembly increases, the increased width of the staple cartridge assembly will be compensated by the elastic deformation of the retaining part due to its better elastic deformation capability, ensuring that disassembly can be performed relatively easily.

[0010] Alternatively or supplementally, the retaining part gradually rises along the direction from both ends to the middle of the retaining part.

[0011] The retaining part gradually rises from both ends to the middle of the retaining part, which helps to avoid jamming during assembly and ensures smooth installation and removal of the staple cartridge assembly.

[0012] Alternatively or supplementarily, in a cross-sectional view perpendicular to the near and far directions, the portion retains a shape with a smooth curve.

[0013] The smooth curve of the retaining part optimizes stress distribution and avoids the formation of bent edges, where stress concentration is prone to occur. During elastic deformation, stress concentration can easily lead to accidental fracture. Therefore, according to the retaining part of this disclosure, during assembly, when external forces are applied to the retaining part, the retaining part can distribute stress more evenly, reducing the risk of damage due to stress concentration.

[0014] Alternatively or supplementarily, in the sectional view, the smooth curve includes a first arc segment and two second arc segments. The first arc segment is located between the two second arc segments, and the center of the first arc segment is located inside the retaining portion. Each second arc segment extends from one of the corresponding ends to the first arc segment, the center of the second arc segment is located outside the retaining portion, and the second arc segment is tangent to the wall and the first arc segment.

[0015] The two second circular arc segments ensure a smooth transition at the connection between the retaining part and the wall, guiding stress to be evenly distributed at the connection and reducing stress concentration in the connection area. This design also helps to prevent jamming during assembly.

[0016] Supplementary or alternative location, the first direction is the up and down direction, and the second direction is the near and far direction.

[0017] When disassembling the staple cartridge assembly, it is generally removed by vertical lifting. When installing the staple cartridge assembly, it is generally installed by pressing down. The retaining part has two ends opposite each other in the vertical direction and two edges opposite each other in the proximal direction, which helps to avoid jamming during disassembly and assembly, ensuring convenient disassembly and assembly.

[0018] The supplementary or alternative wall is provided with two rectangular holes, which are located on opposite sides of the retaining part in the second direction. The two edges are spaced apart from the wall through the two rectangular holes. Each rectangular hole has rounded corners at its four corners.

[0019] Rectangular holes are located on both sides of the retaining part, thus spacing the retaining part from the wall. The rectangular holes have a relatively simple structure, and their fabrication on the wall is relatively easy. The combination of the two rectangular holes and rounded corners effectively disperses localized stress generated during use, avoiding stress concentration caused by sharp corners and improving the mechanical strength and durability of the bottom cover.

[0020] Alternatively, 0.02≤D1 / D2≤0.1, where D1 is the height of the raised part and D2 is the distance between the two walls of the two sidewalls.

[0021] Within the ratio range of 0.02 ≤ D1 / D2 ≤ 0.1, the retaining part has sufficient height. The two opposite ends of the retaining part along the first direction are connected to the wall, and the two opposite edges along the second direction are spaced apart from the wall. This ensures that the retaining part, with sufficient height, can effectively prevent the staple cartridge assembly from accidentally falling off the staple cartridge seat before firing. Even after firing, if the width of the staple cartridge assembly increases, the elastic deformation of the retaining part can be well compensated for.

[0022] On the other hand, this disclosure provides a staple cartridge assembly for a surgical stapler.

[0023] The staple cartridge assembly includes a cartridge body, staples, a firing element, a drive element, and a bottom cover according to the above aspects. The staples are disposed within the cartridge body. The firing element is slidable relative to the cartridge body in a proximal direction. Sliding of the firing element from a proximal to a distal position causes the drive element to eject the staples from the cartridge body. The bottom cover is attached to the cartridge body and covers the bottom of the cartridge body. The surgical stapler also includes a staple cartridge seat, with a retainer configured to detachably attach the staple cartridge assembly to the staple cartridge seat.

[0024] According to the staple cartridge provided in this disclosure, since the staple cartridge assembly adopts a bottom cover with an improved structure, the retaining part can effectively prevent the staple cartridge assembly from accidentally falling off the staple cartridge seat before firing, and the increased width of the staple cartridge assembly after firing will be compensated by the elastic deformation of the retaining part.

[0025] Alternatively or supplementarily, when the firing element is in the far end position, the orthographic projection of the firing element and the orthographic projection of the holding part at least partially overlap on the projection plane perpendicular to the width direction.

[0026] In the use of surgical staplers, a small size and compact structure of the staple cartridge assembly are desirable. However, when the firing pin is located at the distal end after firing, the distal width of the staple cartridge assembly increases. In conventional surgical staplers, to ensure a compact structure of the staple cartridge assembly, the projection of the firing pin at the distal end overlaps with the projection of the retainer in the width direction, but this results in an increased width at the retainer, making disassembly difficult. The bottom cover provided by this disclosure has better elasticity, so even if the projection of the firing pin at the distal end overlaps with the projection of the retainer, it can be removed more easily. Therefore, according to the above-described structure of this disclosure, the staple cartridge assembly has both a more compact structure and can be easily removed from the staple cartridge seat.

[0027] On the other hand, this disclosure also provides an end effector for a surgical anastomosis device.

[0028] The end effector includes an anvil and a staple cartridge. The staple cartridge and anvil are pivotally connected to form a clamp, and the clamp can be switched between an open and closed state by pivoting relative to the anvil. The staple cartridge includes a cartridge seat and a staple cartridge assembly. The staple cartridge assembly is detachably attached to the cartridge seat via a retainer.

[0029] Alternatively or supplementarily, the staple cartridge holder has two opposing seats in the width direction, each seat wall having two receiving grooves on its inner surface. During the installation of the staple cartridge assembly into the staple cartridge holder, the two retaining portions are elastically yielding and entering the two receiving grooves respectively. During the removal of the staple cartridge assembly from the staple cartridge holder, the two retaining portions are elastically yielding and disengaging from the two receiving grooves.

[0030] When the staple cartridge assembly is installed into the staple cartridge holder, the retaining part elastically returns to its original position after passing over the narrow portion above the groove and entering the receiving groove. When the staple cartridge assembly is removed from the staple cartridge holder, the retaining part elastically returns to its original position after passing over the narrow portion above the groove and exiting the staple cartridge holder. Through the cooperation between the retaining part and the receiving groove, the staple cartridge assembly can be reliably attached to the staple cartridge holder, and the staple cartridge assembly can be easily installed into and removed from the staple cartridge holder.

[0031] Alternatively or supplementally, each receiving groove has a groove bottom surface and two groove sides, the two groove sides being located on the upper and lower sides of the groove bottom surface respectively, the two groove sides being inclined relative to the seat wall and gradually expanding outward in a direction away from the groove bottom surface.

[0032] The receiving groove includes a bottom surface and two side surfaces located on its upper and lower sides, respectively. The side surfaces are inclined relative to the seat wall and gradually expand outwards away from the bottom surface. This design allows the retaining part to smoothly slide into the bottom surface of the groove along the inclined path of the side surfaces during installation, preventing potential jamming. Similarly, during disassembly, the retaining part can easily slide out from the gradually expanding side surfaces, reducing the required disassembly force.

[0033] Alternatively, the upper edge of the seat wall is provided with a positioning notch, and the cartridge body is provided with a positioning protrusion. The positioning protrusion is placed in the positioning notch to position the cartridge assembly relative to the cartridge seat. The positioning notch and the retaining part are aligned in the vertical direction.

[0034] During the installation of the staple cartridge assembly onto the staple cartridge holder, the staple cartridge assembly and the staple cartridge holder are accurately positioned through the engagement of the positioning protrusion and the positioning notch. The positioning notch and the retaining part are aligned vertically, that is, the positioning notch is located directly above the retaining part. Therefore, during the insertion or removal of the staple cartridge assembly, the retaining part only needs to contact the surface portion of the inner surface of the holder wall located between the positioning notch and the receiving groove. Because this surface portion has a small vertical dimension, the installation and removal of the staple cartridge assembly is relatively convenient.

[0035] On the other hand, this disclosure also provides a surgical stapler.

[0036] The surgical stapler includes a platform, an elongated body, and an end effector. The elongated body extends in a proximal direction, with its proximal end connected to the platform. The end effector is connected to the distal end of the elongated body. Attached Figure Description

[0037] 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.

[0038] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0039] 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.

[0040] Figure 1 This is a schematic diagram of the structure of a surgical stapler according to an embodiment of the present disclosure.

[0041] Figure 2 for Figure 1 A schematic diagram of the end effector of a surgical stapler, with the end effector in the open position.

[0042] Figure 3 for Figure 2 The diagram shows the structure of the end effector, with the end effector in the off state.

[0043] Figure 4 for Figure 2 A schematic diagram of the pin magazine structure of the end effector in the image.

[0044] Figure 5 for Figure 4 A breakdown diagram of the staple cartridge.

[0045] Figure 6 for Figure 5 An exploded view of the staple cartridge component.

[0046] Figure 7 for Figure 6 A schematic diagram of the bottom cover structure.

[0047] Figure 8 for Figure 7 A magnified view of part A in the middle.

[0048] Figure 9 For along Figure 7 A schematic cross-sectional view taken from the middle BB line.

[0049] Figure 10 for Figure 9 A magnified view of part C in the middle.

[0050] Figure 11 For along Figure 4 A schematic cross-sectional view taken from the DD line.

[0051] Figure 12 for Figure 11 A magnified view of part E in the image.

[0052] Figure 13 for Figure 5 The schematic diagram of the stud cartridge assembly shows the firing mechanism located in two different positions before and after firing. Detailed Implementation

[0053] Traditional surgical staplers face the dual challenges of the staple cartridge assembly easily detaching before firing and being difficult to disassemble after firing. In view of this, this disclosure improves the bottom cover of the staple cartridge assembly, preventing it from accidentally detaching from the staple cartridge holder before firing and allowing for easier removal after firing.

[0054] Numerous specific details are set forth below to provide an understanding of the structure, function, and purpose of the embodiments illustrated in the specification and figures. It is to be understood that this document and the illustrated embodiments are non-limiting examples, and thus it can 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.

[0055] <Example Surgical Anastomosing Device>

[0056] refer to Figure 1 This disclosure provides a surgical stapler 1000.

[0057] To facilitate understanding, the overall structure of the surgical stapler 1000 will be illustrated below with an example. It should be noted that the structure of the surgical stapler 1000 should not be limited to the description below. For example, one or more elements mentioned below may be omitted or replaced, and their layout relationships may be altered.

[0058] like Figure 1 As shown, the surgical stapler 1000 may include an end effector 2000, a platform 3000, and an elongated body 4000.

[0059] Platform 3000 can be held and operated by an operator (such as a doctor) to help control the movement of the end effector. By way of example only, platform 3000 may include handle 3100 and trigger 3200. The operator can hold handle 3100 and pull trigger 3200 to cause end effector 2000 to perform the target action.

[0060] The elongated body 4000 can extend in both proximal and distal directions. The proximal end of the elongated body 4000 can be connected to the platform 3000, and its distal end can be connected to the end effector 2000. The elongated body 4000 can extend the end effector 2000 into the target location within the body through a narrow space to perform suturing on the target tissue.

[0061] In this document, the term "proximal" is used to indicate an end, side, or part of an element (component, element, or part) that is closer to the physician; the term "distal" is used to indicate an end, side, or part of an element that is farther from the physician. In the accompanying drawings, arrow Y+ indicates the distal end in the distal-proximal direction, and arrow Y- indicates the proximal end in the distal-proximal direction.

[0062] The vertical and width directions will also be mentioned below. The near and far directions, as well as the vertical and width directions, are mutually perpendicular. For ease of understanding, the vertical direction is indicated by arrows Z+ and Z- in the accompanying diagram. Arrow Z+ indicates the upper part of the vertical direction, and arrow Z- indicates the lower part. The width direction is indicated by arrows X+ and X-. Arrow X+ indicates one side of the width direction, and arrow X- indicates the other side.

[0063] The end effector 2000 can be used to perform target actions such as closing and firing to perform processes such as clamping, suturing, and cutting target tissue. In some examples, the end effector 2000 can be detachably connected to the elongated body 4000.

[0064] <Example End Actuator>

[0065] The following is for reference. Figure 2 and Figure 3 The construction of the end effector 2000 will be illustrated with an example.

[0066] The end effector 2000 may include a cartridge 100 and an anvil 200. The proximal ends of the cartridge 100 and the anvil 200 may be pivotally connected to form a clamp. When actuated, at least one of the cartridge 100 and the anvil 200 may pivot relative to at least the other, such that the clamp switches between an open state and a closed state; that is, during surgery, the anvil 200 may be actuated by the platform 3000 to open or close.

[0067] The end effector 2000 in the open state Figure 2 As shown in the diagram. In the open state, the target tissue can be placed between the staple cartridge 100 and the anvil 200. As the operator pulls the trigger 3200, the end effector 2000... Figure 2 Switch the open state to Figure 3 The end effector 2000 switches from the open to the closed state, thereby clamping the target tissue between the staple cartridge 100 and the anvil 200. The switching of the end effector 2000 from the open state to the closed state can be called a closing action.

[0068] The end effector 2000 can also be driven to perform a firing action. During firing, staples are ejected from the staple cartridge 100 and shaped under the guidance of the anvil 200, thereby suturing the target tissue located between the staple cartridge 100 and the anvil 200. By way of example only, the end effector 2000 also includes a cutting tool (not shown). During firing, the cutting tool moves from the proximal end of the end effector 2000 to the distal end, cutting the target tissue.

[0069] In some examples, the end effector 2000 can perform the closing action and the firing action simultaneously. In other examples, the end effector 2000 can perform the closing action and the firing action step by step, for example, performing the closing action first and then the firing action. This disclosure does not impose any particular limitation on this.

[0070] <Example Pinning Container>

[0071] The following is for reference. Figures 4 to 12 The structure of the staple cartridge 100 will be illustrated with an example.

[0072] It will be understood that, apart from the staple cartridge which will be described below, other components of the surgical stapler may be known in various ways by those skilled in the art and are not important for the understanding of this disclosure. Therefore, they will not be described in more detail below. These components can be constructed by those skilled in the art based on their experience and prior art.

[0073] refer to Figure 4 and Figure 5 The staple cartridge 100 may include a staple cartridge assembly 10 and a staple cartridge holder 20. The staple cartridge assembly 10 is detachably mounted to the staple cartridge holder 20. The staple cartridge assembly 10 contains a set of anastomotic staples. During the same surgical procedure, if a set of anastomotic staples is exhausted before the surgery is completed, the operator can remove the used staple cartridge assembly 10 from the staple cartridge holder 20 and install the unused staple cartridge assembly 10 onto the staple cartridge holder 20 to replenish the anastomotic staples.

[0074] During the installation of the staple cartridge assembly 10, the staple cartridge assembly 10 can be placed at a certain angle to the staple cartridge base 20; then, the proximal end of the staple cartridge assembly 10 can be inserted into the proximal end of the staple cartridge base 20; finally, the distal end of the staple cartridge assembly 10 can be pressed down to complete the installation of the staple cartridge assembly 10 into the staple cartridge base 20.

[0075] During the disassembly of the staple cartridge assembly 10, the distal end of the staple cartridge assembly 10 can be pulled upward first, so that the distal end is pulled out of the staple cartridge seat 20; then, the staple cartridge assembly 10 can be pulled out from the proximal end of the staple cartridge seat 20 to complete the disassembly process of the staple cartridge assembly 10.

[0076] refer to Figure 6 The staple cartridge assembly 10 may include a bottom cover 11, a cartridge body 12, a staple 13, a firing element 14, and a drive element 15. The staple 13 is disposed within the cartridge body 12. The bottom cover 11 is detachably attached to the cartridge body 12 and covers the bottom of the cartridge body 12. The staple cartridge assembly 10 is reliably attached to the staple cartridge seat 20 via the bottom cover 11. The firing element 14 is slidable relative to the cartridge body 12 in a proximal-remote direction. When the firing element 14 slides from the proximal position to the distal position, the firing element 14 causes the drive element 15 to push the staple 13 out of the cartridge body 12, thereby firing the staple 13.

[0077] Specifically, the chamber 12 may have multiple staple cavities, in which multiple staples 13 can be ejected and housed. Multiple drive members 15 are located at the bottom of the multiple staples 13 and are at least partially located within the staple cavities. As the firing member 14 slides from proximal to distal, the multiple drive members 15 slide from the bottom to the top of the staple cavity, thereby ejecting the multiple staples 13 from the staple cavity. The bottom cover 11 covers the bottom of the chamber 12 to retain the drive members 15 and the staples 13 within the staple cavities.

[0078] refer to Figures 7 to 11 The bottom cover 11 includes a bottom wall 111 and two side walls 112. The two side walls 112 extend upward from the bottom wall 111 and are arranged opposite each other in the width direction. Figure 8 and Figure 9 As shown, each sidewall 112 has a retaining portion 114 that protrudes outward along the width direction of the staple cartridge assembly 10. (Reference) Figure 11 and Figure 12 The staple cartridge holder 20 has two opposite seat walls 21 in the width direction, and the inner surfaces of the two seat walls 21 are respectively provided with two receiving grooves 211. The two retaining parts 114 respectively cooperate with the two receiving grooves 211, so that the staple cartridge assembly 10 is detachably attached to the staple cartridge holder 20.

[0079] Specifically, during the installation of the staple cartridge assembly 10 into the staple cartridge holder 20, the two retaining portions 114 can elastically yield and enter the two receiving grooves 211 respectively. During the removal of the staple cartridge assembly 10 from the staple cartridge holder 20, the two retaining portions 114 can elastically yield and disengage from the two receiving grooves 211.

[0080] The position of the firing element 14 changes before and after firing. Figure 13 The firing mechanism 14 is shown in two positions, before and after firing. Figure 13 The firing element 14, which is closer to the proximal end (i.e., the right end in the diagram), is located before firing, while the firing element 14, which is closer to the distal end (i.e., the left end in the diagram), is located after firing.

[0081] The change in position of the firing element 14 before and after firing causes a change in the width of the staple cartridge assembly 10. Specifically, after firing, the firing element 14 applies an outward compressive force to the staple cartridge assembly 10, causing the width of the staple cartridge assembly 10, especially the width near the distal end, to become larger than before firing.

[0082] Because the width of the staple cartridge assembly 10 can change, conventional surgical staplers 1000 face the dual challenges of the staple cartridge assembly 10 being prone to detachment before firing and the staple cartridge assembly 10 being difficult to disassemble after firing. Specifically, in conventional surgical staplers 1000, if the height of the retaining portion 114 is small, the staple cartridge assembly 10 is at risk of detachment before firing; conversely, if the height of the retaining portion 114 is large, the disassembly process becomes difficult after firing due to the increased width of the staple cartridge assembly 10.

[0083] Therefore, refer to Figure 6 and Figure 7 According to the bottom cover 11 provided in this embodiment, the retaining portion 114 includes two ends 114A opposite to each other in a first direction and two edges 114B opposite to each other in a second direction. The retaining portion 114 is connected to the side wall 112 through the two ends 114A opposite to each other in the first direction, and the edges 114B opposite to each other in the second direction of the retaining portion 114 are spaced apart from the wall 113. Here, the first direction is perpendicular to the second direction.

[0084] In conventional bottom cover 11, the entire outer periphery of the retaining part 114 is connected to the side wall 112, resulting in poor elastic deformation capability of the retaining part 114 itself. When the retaining part 114 is compressed, the elastic deformation mainly occurs on the side wall 112, which also has poor elastic deformation capability. This leads to poor adaptability of the conventional staple cartridge assembly 10 to changes in width. If the bulge height of the retaining part 114 is small, the staple cartridge assembly 10 is at risk of detachment when not fired. Conversely, if the bulge height of the retaining part 114 is large, the disassembly process will become difficult after firing due to the increased width of the staple cartridge assembly 10.

[0085] According to the bottom cover 11 provided in this disclosure, the retaining portion 114 is connected to the side wall 112 via two opposite ends 114A along a first direction, and the retaining portion 114 is spaced apart from the wall 113 by its opposite edges 114B along a second direction. This gives the retaining portion 114 itself better elastic deformation capability, thereby providing a larger elastic deformation and better adapting to and absorbing the deformation of the staple cartridge assembly 10. Due to the better elastic deformation capability of the retaining portion 114 itself, the retaining portion 114 can be given a larger bulge height. Before firing, when the width of the staple cartridge assembly 10 is small, the higher bulge of the retaining portion 114 can effectively prevent the staple cartridge assembly 10 from accidentally falling off the staple cartridge seat 20. After firing, although the width of the staple cartridge assembly 10 increases, the increased width of the staple cartridge assembly 10 will be compensated by the elastic deformation of the retaining portion 114 itself due to its better elastic deformation capability, ensuring that disassembly can be performed relatively easily.

[0086] To ensure smooth installation and removal of the staple cartridge assembly 10, please refer to [the relevant documentation / reference]. Figures 8 to 10Along the direction from the two ends 114A of the retaining portion to the middle portion 114C of the retaining portion 114, the retaining portion 114 gradually rises. That is, the closer the retaining portion 114 is to its middle portion 114, the more it protrudes outward in the width direction. This structure helps to avoid jamming during assembly and ensures smooth installation and removal of the staple cartridge assembly 10.

[0087] Continue to refer to Figure 9 and Figure 10 In a cross-sectional view perpendicular to the near and far directions, the retaining portion 114 has a smooth curved shape. This construction optimizes stress distribution and avoids the generation of bent edges, where stress concentration is prone to occur. During elastic deformation, stress concentration can easily lead to accidental fracture. Therefore, according to the retaining portion 114 of this disclosure, during assembly, when external forces are applied to the retaining portion 114, the retaining portion 114 can distribute stress more evenly, reducing the risk of damage due to stress concentration.

[0088] refer to Figure 9 and 10 The smooth curve may include a first arc segment L1 and two second arc segments L2. The first arc segment L1 is located between the two second arc segments L2, and the center of the first arc segment L1 is located inside the retaining part 114. Each second arc segment L2 extends from one of the two ends 114A to the first arc segment L1, and the center of the second arc segment L2 is located outside the retaining part 114, and the second arc segment L2 is tangent to the wall 113 and the first arc segment L1. The two second arc segments L2 make the connection between the retaining part 114 and the wall 113 smoothly transition, guide the stress to be evenly distributed at the connection, and reduce stress concentration in the connection area. At the same time, the shape of the smooth curve L of the retaining part 114 also helps to avoid jamming during assembly.

[0089] refer to Figure 7 In a preferred embodiment, the first direction can be vertical, and the second direction can be near-far. When disassembling the staple cartridge assembly 10, it is generally removed by a vertical lifting motion. When installing the staple cartridge assembly 10, it is generally installed by a downward pressing motion. The retaining part 114 has two ends 114A opposite each other in the vertical direction and two edges 114B opposite each other in the near-far direction, which helps to avoid jamming during disassembly and assembly, ensuring convenient disassembly and assembly.

[0090] refer to Figure 8The wall 113 may have two rectangular holes 115, which are located on opposite sides of the retaining portion 114 in the second direction. Two edges 114B are spaced apart from the wall 113 through the two rectangular holes 115. Each rectangular hole 115 has rounded corners at its four corners. The rectangular holes 115 are located on both sides of the retaining portion 114, thus spacing the retaining portion 114 from the wall 113. The rectangular holes 115 have a relatively simple structure, and the machining difficulty of forming them on the wall 113 is low. The combination of the two rectangular holes 115 and the rounded corners effectively disperses the localized stress generated during use of the bottom cover 11, avoiding stress concentration caused by sharp corners, and improving the mechanical strength and durability of the bottom cover 11.

[0091] If the height of the retaining part 114 is too high, before firing, the firing element 14 is located at the proximal end, allowing the staple cartridge assembly 10 to maintain a tight fit with the staple cartridge seat 20. However, after firing, the firing element 14 is located at the distal end, applying an outward compressive force to the staple cartridge assembly 10. This results in the width of the staple cartridge assembly 10 after firing, especially near the distal end, becoming larger than before firing. This makes disassembly of the staple cartridge assembly 10 difficult and requires greater force. If the height of the retaining part 114 is too low, before firing, the firing element 14 is located at the proximal end, resulting in a smaller width for the staple cartridge assembly 10, which poses a risk of detachment.

[0092] To ensure that the retaining part 114 has sufficient raised height. (Reference) Figure 9 The ratio 0.02 ≤ D1 / D2 ≤ 0.1, where D1 is the height of the retaining portion 114 and D2 is the distance between the two walls 113 of the two sidewalls 112. By way of example only, D1 can be the height of the outer surface of the middle portion 114C of the retaining portion, and D2 can be the distance between the outer surfaces of the two walls 113 of the two sidewalls 112. D1 can also be the height of the inner surface of the middle portion 114C of the retaining portion, and D2 can be the distance between the inner surfaces of the two walls 113 of the two sidewalls 112. Within the ratio range of 0.02 ≤ D1 / D2 ≤ 0.1, the retaining portion 114 has sufficient height. The two ends 114A of the retaining portion 114, which are opposite each other in the first direction, are connected to the wall 113, and the two edges 114B, which are opposite each other in the second direction, are spaced apart from the wall 113. This ensures that the retaining portion 114, with sufficient height, can effectively prevent the staple cartridge assembly 10 from accidentally falling off the staple cartridge seat 20 before firing. Even when the width of the cartridge assembly 10 increases after firing, it can be well compensated by the elastic deformation of the retaining part 114.

[0093] refer to Figure 13 When the firing element 14 is in the far end position, on the projection plane perpendicular to the width direction, the orthographic projection of the firing element 14 and the orthographic projection of the holding part 114 at least partially overlap.

[0094] During the use of the surgical stapler 1000, it is desirable for the staple cartridge assembly 10 to have a small size and a compact structure. However, when the firing element 14 is located at the distal end after firing, it causes an increase in the distal width of the staple cartridge assembly 10. In conventional surgical staplers 1000, in order to ensure a compact structure of the staple cartridge assembly 10, the firing element 14 at the distal end overlaps with the projection of the retaining portion 114 in the width direction, but this results in an increase in the width of the retaining portion 114, leading to difficulties in disassembly. The bottom cover 11 provided according to this disclosure has better elasticity. Therefore, even if the projection of the firing element 14 at the distal end overlaps with the retaining portion 114, it can be removed more easily. Therefore, according to the above-described structure of this disclosure, the staple cartridge assembly 10 has both a more compact structure and can be removed from the staple cartridge seat 20 more easily.

[0095] refer to Figure 12 Each receiving groove 211 has a groove bottom surface 211A and two groove side surfaces 211B. The two groove side surfaces 211B are located on the upper and lower sides of the groove bottom surface 211A, respectively. The two groove side surfaces 211B are inclined relative to the seat wall 21 and gradually expand outward in a direction away from the groove bottom surface 211A. The receiving groove 211 includes a groove bottom surface 211A and two groove side surfaces 211B located on its upper and lower sides, respectively. The groove side surfaces 211B are inclined relative to the seat wall 21 and gradually expand outward in a direction away from the groove bottom surface 211A. With this configuration, during installation, the retaining part 114 can smoothly slide into the groove bottom surface 211A along the inclined path of the groove side surfaces 211B, avoiding possible jamming. Similarly, during disassembly, the retaining part 114 can easily slide out from the gradually expanding groove side surfaces 211B, reducing the required disassembly force.

[0096] refer to Figure 5 and Figure 11 The upper edge of the seat wall 21 is provided with a positioning notch 212, and the cartridge body 12 is provided with a positioning protrusion 121. The positioning protrusion 121 is placed in the positioning notch 212 to position the staple cartridge assembly 10 relative to the staple cartridge seat 20. The positioning notch 212 and the retaining part 114 are aligned in the vertical direction.

[0097] During the installation of the staple cartridge assembly 10 onto the staple cartridge holder 20, the staple cartridge assembly 10 and the staple cartridge holder 20 are accurately positioned through the engagement of the positioning protrusion 121 and the positioning notch 212. The positioning notch 212 and the retaining part 114 are aligned vertically, that is, the positioning notch 212 is located directly above the retaining part 114. Therefore, during the insertion or removal of the staple cartridge assembly 10, the retaining part 114 only needs to contact the surface portion of the inner surface of the holder wall 21 located between the positioning notch 212 and the receiving groove 211. Since the vertical dimension of this surface portion is small, the insertion and removal of the staple cartridge assembly is relatively convenient.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 bottom cover for a staple cartridge assembly, characterized in that, The staple cartridge assembly includes a cartridge body and a bottom cover, the bottom cover being adapted to attach to the cartridge body and cover the bottom of the cartridge body, the bottom cover comprising: bottom wall; and Two sidewalls extend upward from the bottom wall and are arranged opposite each other along the width direction; Each sidewall includes a wall body and a retaining portion that protrudes outward from the wall body in the width direction. The retaining portion includes two ends opposite each other in a first direction and two edges opposite each other in a second direction perpendicular to the first direction. The two ends are connected to the wall body, and the two edges are spaced apart from the wall body.

2. The bottom cover according to claim 1, characterized in that, The retaining portion gradually rises along the direction from the two ends to the middle of the retaining portion.

3. The bottom cover according to claim 2, characterized in that, In a cross-sectional view perpendicular to the near and far directions, the retaining portion has a smooth curved shape.

4. The bottom cover according to claim 3, characterized in that, In the cross-sectional view, the smooth curve includes a first arc segment and two second arc segments; the first arc segment is located between the two second arc segments, and the center of the first arc segment is located inside the retaining portion; each second arc segment extends from one of the two ends to the first arc segment, the center of the second arc segment is located outside the retaining portion, and the second arc segment is tangent to the wall and the first arc segment.

5. The bottom cover according to claim 1, characterized in that, The first direction is the up-down direction, and the second direction is the near-far direction.

6. The bottom cover according to any one of claims 1 to 5, characterized in that, The wall is provided with two rectangular holes, which are located on opposite sides of the retaining part in the second direction. The two edges are spaced apart from the wall through the two rectangular holes, and each rectangular hole has rounded corners at its four corners.

7. The bottom cover according to any one of claims 1 to 5, characterized in that, 0.02≤D1 / D2≤0.1, where D1 is the height of the raised part of the retaining part and D2 is the distance between the two walls of the two side walls.

8. The bottom cover according to any one of claims 1 to 5, characterized in that, On a projection plane perpendicular to the width direction, the orthographic projections of the two retaining portions of the two sidewalls at least partially overlap.

9. The bottom cover according to any one of claims 1 to 5, characterized in that, The retaining portion is closer to the distal end of the bottom cover than to the proximal end of the bottom cover.

10. A staple cartridge assembly for a surgical stapler, characterized in that, The staple cartridge component includes: Warehouse body; Anastomosis staples are disposed in the chamber; The firing element is slidable relative to the chamber body along the near-far direction; The sliding of the firing element from a proximal position to a distal position causes the driving element to eject the staple from the chamber; and The bottom cover according to any one of claims 1 to 9 is attached to the compartment body and covers the bottom of the compartment body; The surgical stapler also includes a staple cartridge seat, and the retainer is configured to operatively attach the staple cartridge assembly to the staple cartridge seat.

11. The staple cartridge assembly according to claim 10, characterized in that, When the firing element is located at the far end position, on a projection plane perpendicular to the width direction, the orthographic projection of the firing element at least partially overlaps with the orthographic projection of the holding portion.

12. An end effector of a surgical stapler, characterized in that, The end effector includes: Anvil; and The staple cartridge is pivotally connected to the anvil to form a clamp, and the clamp can be switched between an open and closed state by pivoting relative to the anvil; The staple cartridge includes: Pin holder; and According to claim 10 or 11, the staple cartridge assembly is operably attached to the staple cartridge holder via the retaining portion.

13. The end effector according to claim 12, characterized in that, The staple cartridge seat has two seat walls that are opposite each other in the width direction, and the inner surfaces of the two seat walls are respectively provided with two receiving grooves; During the process of installing the staple cartridge assembly into the staple cartridge seat, the two retaining parts are able to elastically yield and enter the two receiving grooves respectively; During the process of removing the staple cartridge assembly from the staple cartridge seat, the two retaining parts are able to elastically yield and disengage from the two receiving grooves.

14. The end effector according to claim 13, characterized in that, Each receiving groove has a groove bottom surface and two groove sides, the two groove sides being located on the upper and lower sides of the groove bottom surface respectively, the two groove sides being inclined relative to the seat wall and gradually expanding outward in a direction away from the groove bottom surface.

15. The end effector according to claim 14, characterized in that, The upper edge of the seat wall is provided with a positioning notch, and the cartridge body is provided with a positioning protrusion. The positioning protrusion is placed in the positioning notch to position the staple cartridge assembly relative to the staple cartridge seat. On the projection plane perpendicular to the vertical direction, the orthographic projection of the receiving groove covers the orthographic projection of the positioning notch, and the positioning notch and the retaining part are aligned along the vertical direction.

16. A surgical stapler, characterized in that, include: platform; An elongated body extending in the proximal direction, with its proximal end connected to the platform; as well as The end effector according to any one of claims 12 to 15 is connected to the distal end of the elongated body.

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