Endoscopic anastomat

Abstract

This invention provides a laparoscopic stapler. The laparoscopic stapler includes a distal end and a proximal end opposite each other along the axial direction of the stapler. The laparoscopic stapler includes: a handle portion; a cannula assembly; a clamping body assembly; an axially movable cutting blade body with a protrusion protruding from the side of the cutting blade body; a blade assembly that moves along a first direction or in the opposite direction under the drive of the cutting blade body, the first direction being the direction of axial movement toward the distal end of the stapler, the blade assembly including an elastic portion adapted to the protrusion; a mating portion for applying pressure to the elastic portion when in contact with the elastic portion; the blade assembly is configured such that: in a free state, the elastic portion is separated from the protrusion; and when the elastic portion moves along the first direction, it is pressed by the mating portion and connected to the protrusion. This invention provides an elastic portion on the blade assembly that engages with the mating portion, which overcomes the risk of the blade assembly falling off during the retraction process and enables the cutting blade body to be reused.

Description

Technical Field

[0001] This utility model relates to medical devices, and more particularly to an endoscopic anastomosis device. Background Technology

[0002] In surgical treatment, various staplers are widely used. Currently, the various staplers used in clinical practice have advantages such as fast and accurate suturing, simple operation, less bleeding, and few side effects and surgical complications. They can be used to remove lesions, and therefore are widely used both domestically and internationally.

[0003] Laparoscopic staplers typically consist of a handle, a shaft assembly, and a clamp assembly. The clamp assembly includes an anvil and a cartridge assembly. The cartridge assembly includes a cartridge and a cartridge seat, with the cartridge mounted on the cartridge seat. The cutting blade is typically located within the shaft assembly and can be moved into the clamp assembly by the handle. Once the clamp assembly is closed, the cutting blade cuts the clamped tissue.

[0004] In existing staplers, the cutting blade is mostly reused, leading to reduced cutting performance and failure to meet surgical requirements. Some existing staplers have a detachable connection between the cutting blade and the blade body, allowing for reuse of the blade body and replacement of the cutting blade alone. However, during the retraction process, the cutting blade can easily detach from the blade body, posing a danger. Utility Model Content

[0005] At least one embodiment of this utility model provides a laparoscopic anastomosis device, including a distal end and a proximal end opposite to each other along the axial direction of the laparoscopic anastomosis device. The laparoscopic anastomosis device includes: a handle portion; a cannula assembly disposed at the distal end of the handle portion; a closable or openable clamping body assembly disposed at the distal end of the cannula assembly; a cutting blade body movable along the axial direction disposed within the cannula assembly, wherein the cutting blade body is provided with a protrusion protruding relative to the side of the cutting blade body; and a blade assembly disposed at the distal end of the cutting blade body and configured to move along a first direction under the drive of the cutting blade body. One direction is the direction of movement toward the distal end of the stapler in the axial direction. The blade assembly includes an elastic portion adapted to the protrusion; a mating portion for applying pressure to the elastic portion when in contact with the elastic portion to bring the elastic portion closer to the protrusion; wherein the blade assembly is configured such that: in a free state, the elastic portion is separated from the protrusion to separate the blade assembly from the cutting blade body; and the elastic portion is pressed by the mating portion and connected to the protrusion when moving along the first direction to detachably connect the blade assembly to the cutting blade body.

[0006] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the forceps assembly includes a staple cartridge assembly and a staple anvil, the staple cartridge assembly and the staple anvil are rotatable relative to each other, the staple cartridge assembly includes a staple cartridge seat and a staple cartridge detachably mounted on the staple cartridge seat; the staple cartridge includes the mating part, the mating part being located at the proximal end of the staple cartridge.

[0007] For example, in a laparoscopic stapler provided in at least one embodiment of the present invention, the staple cartridge assembly further includes a staple pusher slider, which is movable within the staple cartridge and configured to push the staples in the staple cartridge assembly; when the staple pusher slider is located at the proximal end of the staple cartridge assembly, the distal end of the blade assembly abuts against the staple pusher slider; the blade assembly and the staple pusher slider are configured to be driven by the cutting blade body to move along the first direction.

[0008] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the number of protrusions is two, and the two protrusions protrude from the two sides of the cutting blade body in a third direction, wherein the third direction is perpendicular to the axial direction and perpendicular to the height direction; the elastic part includes two elastic sheets, the two elastic sheets correspond one-to-one with the two protrusions, and the proximal end of each elastic sheet has a connecting part that is detachably connected to the protrusion.

[0009] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the blade assembly further includes a blade body and a blade, the blade being disposed at the distal end of the blade body, and the two elastic sheets being respectively located on both sides of the blade body in the third direction.

[0010] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the blade assembly further includes a first base and a second base located on both sides of the blade body in the third direction. Each of the first base and the second base includes a base and an inclined body extending obliquely from the base along the height direction. The two elastic sheets are a first elastic sheet and a second elastic sheet. The distal end of the first elastic sheet is disposed on the base of the first base, and the distal end of the first elastic sheet is located between the inclined body of the first base and the blade body. The distal end of the second elastic sheet is disposed on the base of the second base, and the distal end of the second elastic sheet is located between the inclined body of the second base and the blade body.

[0011] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the pusher slider includes a slider body and a first pusher portion and a second pusher portion located on both sides of the slider body. When the distal end of the blade body portion abuts against the slider body, the first base portion is located between the first pusher portion and the slider body, the second base portion is located between the second pusher portion and the slider body, the distal end of the first base portion abuts against the first pusher portion, and the distal end of the second base portion abuts against the second pusher portion.

[0012] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the mating part includes two pressure plates, which correspond one-to-one with the two elastic sheets. The pressure plates extend into sheet shapes in the axial and height directions. The proximal end of the elastic sheet is configured to tilt away from the base in the free state. The bottom end of the pressure plate is positioned in the height direction between the position of the proximal end of the elastic sheet in the free state and the position of the distal end of the elastic sheet, so that pressure is applied to the elastic sheet when the pressure plate contacts the elastic sheet.

[0013] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the connecting part includes a hook-shaped structure, the opening of the hook-shaped structure facing the distal end of the blade assembly, and the hook-shaped structure is configured to engage with the protrusion when the elastic sheet is pressed by the mating part, so as to realize the connection between the elastic part and the protrusion.

[0014] For example, in a laparoscopic anastomosis device provided in at least one embodiment of the present invention, the handle portion includes a power unit configured to drive the cutting blade to move along the axial direction.

[0015] Compared with the prior art, the beneficial effects of at least one embodiment of the present invention include: by providing an elastic part on the blade assembly and cooperating with the mating part, the risk of the blade assembly falling off during the retraction process can be overcome, enabling the cutting blade to be reused. Furthermore, the blade assembly is mounted on the staple cartridge, allowing the blade assembly to be replaced simultaneously when changing the staple cartridge, thus solving the drawback of the prior art where repeated use of the blade assembly causes the blade to dull and reduces cutting performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figures 1-2 This is a partial structural schematic diagram of the anastomosis device provided in some embodiments of the present invention.

[0018] Figure 3 This is a schematic diagram of a cutting blade provided in some embodiments of the present invention.

[0019] Figure 4 This is a schematic diagram of a blade assembly provided in some embodiments of the present invention.

[0020] Figure 5 This is a schematic diagram illustrating the cooperation between the blade assembly and the push pin slider provided in some embodiments of this utility model.

[0021] Figure 6 This is a schematic diagram of a staple cartridge provided for some embodiments of the present invention.

[0022] Figures 7-8 This is a schematic diagram illustrating the state of the mating parts, elastic parts, and protrusions in some embodiments of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0025] The accompanying drawings in this invention are not strictly drawn to scale; the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0026] The features "parallel," "perpendicular," and "identical" used in this invention include the strictly defined meanings of "parallel," "perpendicular," and "identical," as well as cases where "substantially parallel," "substantially overlapping," and "substantially identical" contain a certain degree of error. Taking into account measurement and errors associated with the measurement of a specific quantity (e.g., limitations of the measurement system), they represent the acceptable deviation range for a specific value as determined by a person skilled in the art. For example, "substantially" can mean within one or more standard deviations, and unless otherwise specified, can mean within 10% or 5% of the deviation of said value.

[0027] This research has revealed that in some existing staplers, the connection between the cutting blade and the firing mechanism is unreliable, and the cutting blade is prone to detachment. Firing refers to the process where the cutting blade moves from the proximal to the distal end when the stapler has completed tissue positioning. In other existing staplers, the cutting blade is often reused. After repeated use, the sharpness of the cutting edge decreases rapidly, resulting in the stapler's cutting performance failing to meet requirements.

[0028] In response, at least one embodiment of this utility model provides a laparoscopic anastomosis device, including a distal end and a proximal end opposite to each other along the axial direction of the laparoscopic anastomosis device. The laparoscopic anastomosis device includes: a handle portion; a cannula assembly disposed at the distal end of the handle portion; a closable or openable clamping body assembly disposed at the distal end of the cannula assembly; an axially movable cutting blade body disposed within the cannula assembly, wherein the cutting blade body has a protrusion protruding relative to the side of the cutting blade body; and a blade assembly disposed at the distal side of the cutting blade body and configured to move along a first direction under the drive of the cutting blade body. Alternatively, it can move in a second direction opposite to the first direction, the first direction being the direction of axial movement toward the distal end of the stapler. The blade assembly includes an elastic portion that is adapted to a protrusion; and a mating portion for applying pressure to the elastic portion when in contact with the elastic portion to bring the elastic portion closer to the protrusion. The blade assembly is configured such that, in a free state, the elastic portion separates from the protrusion to separate the blade assembly from the cutting blade body; and, when moving along the first direction, the elastic portion is pressed by the mating portion and connected to the protrusion to detachably connect the blade assembly to the cutting blade body.

[0029] This invention overcomes the risk of the blade assembly detaching during the retraction process by providing an elastic part on the blade assembly and cooperating with a mating part to control the separation or connection between the blade assembly and the cutting blade body. This allows for the reusability of the cutting blade body. Furthermore, the blade assembly is mounted on the staple cartridge, allowing for simultaneous replacement of the blade assembly when changing the staple cartridge. This solves the problem in existing technologies where repeated use of the blade assembly causes the blade to dull, reducing cutting performance.

[0030] In embodiments of this invention, the terms "proximal" (or "proximal side") and "distal" (or "distal side") are relative to the operator of the instrument. For example, the term "proximal" refers to the portion of a component or structure closer to the operator, the term "proximal side" refers to the side of a component or structure closer to the operator, the term "distal" refers to the portion of a component or structure farther from the operator, and the term "proximal side" refers to the side of a component or structure farther from the operator. In embodiments of this invention, "axial" refers to the direction of the central axis of the device or component. It should be noted that these definitions are for convenience only and should not be construed as limitations of this invention.

[0031] The embodiments and examples of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] Figures 1-2 This is a partial structural schematic diagram of the anastomosis device provided in some embodiments of the present invention.

[0033] For example, such as Figure 1 and Figure 2 As shown, at least one embodiment of this utility model also provides a laparoscopic anastomosis device 1000 (also referred to as a laparoscopic anastomosis apparatus, hereinafter simply referred to as "anastomosis device"). The anastomosis device 1000 includes a cannula assembly 200 and a handle portion (not shown in the figure). The handle portion includes a power unit. The cannula assembly 200 is disposed at the distal end of the handle portion.

[0034] exist Figure 1 In the example, for the sake of clarity and brevity in this article, the axis of the stapler 1000 is marked as axis D1, which can be understood as the direction of extension of the entire stapler.

[0035] This invention also designates the direction of movement toward the distal end of the stapler in the axial direction D1 as the first direction D11, and marks the second direction D12 as the direction opposite to the first direction D11 in the axial direction D1, that is, the direction of movement toward the proximal end of the stapler.

[0036] This invention also designates a direction perpendicular to the first direction D1 as the height direction D2 (see below) Figure 4 (As shown). In the embodiments of this utility model, the height direction D2 refers to a direction perpendicular to the axis D1, and does not specifically refer to a direction perpendicular to the ground.

[0037] For example, such as Figure 1 and Figure 2As shown, the anastomosis device 1000 provided in at least one embodiment of the present invention includes a clamping body assembly 1, a cutting blade 2, and a cutting edge assembly 3. The clamping body assembly 1 is configured to be closable or openable and is disposed at the distal end of the cannula assembly 200. For example, the clamping body assembly 1 can be closed to clamp the target tissue or can be opened to release the target tissue. The cutting edge assembly 3 is used to cut the target tissue clamped by the clamping body assembly 1. The cutting blade 2 is disposed within the cannula assembly 200. The cutting edge assembly 3 is disposed distal to the cutting blade 2. The cutting blade 2 is configured to be movable along an axial direction D1, thereby driving the cutting edge assembly 3 to move to cut the target tissue clamped by the clamping body assembly 1.

[0038] In some examples, the handle of the anastomosis device 1000 includes a power unit configured to drive the cutting blade 2 to move along the axial direction D1, thereby driving the blade assembly 3 to cut the target tissue.

[0039] In some examples, the blade assembly 3 and the cutting blade body 2 are two separate parts, and the blade assembly 3 and the cutting blade body 2 can be detachably connected (for example, as can be seen below, the elastic part 31 of the blade assembly 3 is away from the protrusion 21 of the cutting blade body 2 in the free state, and will be connected to the protrusion 21 of the cutting blade body 2 when the elastic part 31 of the blade assembly 3 is pressed by the mating part 5). In embodiments of this utility model, the combination of the blade assembly 3 and the cutting blade body 2 can also be referred to as a cutting assembly.

[0040] For example, when the cutting blade 2 moves distally, it comes into contact with the proximal end of the blade assembly 3, thereby pushing the blade assembly 3 to move distally as well. When the cutting blade 2 moves proximally, the connection between the two (see below for details) pulls the blade assembly 3 to move proximally as well, thus gradually disengaging the blade assembly 3 from the cutting blade 2. In this way, the present invention allows the cutting blade 2 to be reused and the blade assembly 3 to be replaceable.

[0041] Figure 3 This is a schematic diagram of a cutting blade provided in some embodiments of the present invention. Figure 4 This is a schematic diagram of a blade assembly provided in some embodiments of the present invention. Figure 5 This is a schematic diagram illustrating the cooperation between the blade assembly and the push pin slider provided in some embodiments of this utility model. Figure 6 This is a schematic diagram of a staple cartridge provided for some embodiments of the present invention.

[0042] For example, such as Figure 3As shown, the cutting blade body 2 is provided with a protrusion 21 that protrudes relative to the side 22 of the cutting blade body 2. For example, the protrusion 21 may be integrally formed on the cutting blade body 2. Of course, this is only an example and is not a limitation of this utility model. For example, the protrusion 21 may also be a separate part and fixedly connected to the cutting blade body 2, which will not be described in detail here.

[0043] For example, such as Figures 1-2 As shown, the clamp assembly 1 includes a staple cartridge assembly 11 and a staple anvil 12, which are rotatable relative to each other. The staple cartridge assembly 11 includes a staple cartridge seat 111 and a staple cartridge 112 detachably mounted on the staple cartridge seat 111.

[0044] For example, the staple cartridge assembly 11 and the anvil 12 are configured to engage with each other to close the clamp assembly 1, and to move away from each other to open the clamp assembly 1. For instance, the staple cartridge assembly 11 is capable of pivoting relative to the anvil 12 about a closing axis.

[0045] For example, the anvil 12 could also be pivotable relative to the staple cartridge assembly 11, such as... Figure 1 As shown, the anvil 12 is capable of pivoting about a closed axis relative to the staple cartridge assembly 11.

[0046] The embodiments of this utility model are not limited in this respect, as long as the staple cartridge assembly 11 and the staple anvil 12 are movably connected to each other and can realize the closing or opening of the clamp assembly 1, which will not be described in detail here.

[0047] In embodiments of this invention, the cutting blade 2 also functions as a closing device, configured to move along the axial direction D1 to drive the clamp assembly 1 to close. For example, as Figure 3 As shown, the cutting blade 2 also includes a lower edge 23 and an upper edge 24. When the cutting blade 2 moves from the proximal end to the distal end, the lower edge 23 of the cutting blade 2 contacts the staple cartridge seat 111, and the upper edge 24 pivots the anvil 12 along the inclined surface of the anvil 12 until it is parallel to the staple cartridge seat 111, thereby completing tissue positioning.

[0048] For example, such as Figure 3 As shown, there are two protrusions 21 on the cutting blade body 2. The two protrusions 21 protrude from the two sides 22 of the cutting blade body in the third direction D3. The third direction D3 is perpendicular to the axial direction D1 and perpendicular to the height direction D2.

[0049] For example, such as Figures 2-4As shown, the blade assembly 3 can be configured to move along a first direction D11 (i.e., from the proximal end to the distal end of the stapler 1000) or along a second direction D12 opposite to the first direction D11, driven by the cutting blade body 2. For example, when the cutting blade body 2 is driven to move distally, the cutting blade body 2 will contact the blade assembly 3, thereby driving the blade assembly 3 to move distally together.

[0050] For example, such as Figure 2 and Figure 5 As shown, the staple cartridge assembly 11 also includes a staple pusher slider 4, which is movable within the staple cartridge 112 and configured to push the staples in the staple cartridge 112. For example, as Figure 5 and Figure 6 As shown, the pusher slider 4 includes a slider body 41 and a first pusher portion 42 and a second pusher portion 43 located on both sides of the slider body 41. The slider body 41 is configured to move along the axial direction D1 in the intermediate slide 113 of the staple cartridge 112, wherein the intermediate slide 113 is a slide located in the middle region of the staple cartridge 112 and extends along the axial direction D1. The first pusher portion 42 and the second pusher portion 43 move along the axial direction D1 to push out the staples located on both sides of the intermediate slide 113 of the staple cartridge 112.

[0051] For example, such as Figure 4 As shown, the blade assembly 3 includes an elastic portion 31. The elastic portion 31 of this invention is a structure with elastic deformation capability (e.g., made of a material with elastic deformation capability). The elastic portion 31 is adapted to the protrusion 21.

[0052] For example, the elastic part 31 can maintain its initial free state when it is not subjected to external force, and when it is subjected to external pressure, the elastic part 31 will generate elastic displacement in the corresponding reference direction (e.g., the direction parallel to the axial direction D1), and automatically return to its initial free state (also known as normal state) after the external force is removed.

[0053] In some examples, the elastic part 31 may be an elastic sheet metal part. Of course, this is merely exemplary and is not intended to limit the embodiments of this utility model.

[0054] For example, such as Figure 6 As shown, the stapler 1000 also includes a mating portion 5. For example, the staple cartridge 112 may include the mating portion 5, which is located at the proximal end of the staple cartridge 112. In an embodiment of the present invention, the mating portion 5 is configured to apply pressure to the elastic portion 31 when in contact with the elastic portion 31, causing the elastic portion 31 to approach the protrusion 21, thereby connecting the elastic portion 31 with the protrusion 21.

[0055] In an embodiment of this invention, the blade assembly 3 is configured such that, in a free state, the elastic portion 31 separates from the protrusion 21, thereby separating the blade assembly 3 from the cutting blade body 2; and, as the elastic portion 31 moves along the first direction D11, it is pressed by the mating portion 5 and gradually connects to the protrusion 21, thereby detachably connecting the blade assembly 3 to the cutting blade body 2. Thus, because the elastic portion 31 is connected to the protrusion 21, when the cutting blade body 2 moves along the second direction D12, it pulls the blade assembly 3 along the second direction D12 (i.e., the direction of blade return).

[0056] For example, the elastic part 31 and the protrusion 21 form a kinematic relationship through a separable locking action.

[0057] This invention enables the blade assembly 3 to return to the proximal position of the staple cartridge 112 along with the cutting blade body 2 during retraction. Thus, because the blade assembly 3 returns to the proximal position of the staple cartridge assembly after firing, the safety of the patient and instrument operator is ensured despite the sharpness of the blade surface.

[0058] The above embodiments of this utility model, by providing an elastic part 31 on the blade assembly 3 and cooperating with the mating part 5, control the separation or connection between the blade assembly 3 and the cutting blade body 2, overcoming the risk of the blade assembly 3 falling off during the retraction process, and enabling the cutting blade body 2 to be reused. Furthermore, the blade assembly is mounted on the staple cartridge, allowing the blade assembly 3 to be replaced simultaneously when replacing the staple cartridge 112, thus solving the drawback of reduced cutting performance due to blade dulling caused by repeated use of the blade assembly 3.

[0059] For example, such as Figure 4 and Figure 5 As shown, the blade assembly 3 and the pusher slider 4 can be arranged separately. When the pusher slider 4 is located at the proximal end of the staple cartridge assembly 11, the distal end of the blade assembly 3 abuts against the pusher slider 4 (for example, the blade assembly 3 and the pusher slider 4 are normally abutting, but after suturing and cutting, the pusher slider 4 will remain at the distal end in the staple cartridge 112, while the blade assembly 3 will move towards the proximal end with the cutting blade 2). Thus, in normal operation, both the blade assembly 3 and the pusher slider are located at the proximal end of the staple cartridge assembly 11. The blade assembly 3 and the pusher slider 4 of this invention can be driven by the cutting blade 2 to move along the first direction D11. When the stapler completes tissue positioning, at this time, when the cutting blade 2 moves from the proximal end to the distal end, the blade assembly 3 and the cutting blade 2 connect, further pushing the blade assembly 3 and the pusher slider 4 towards the distal end, completing the cutting and anastomosis process.

[0060] Thus, this invention ensures that when the staple cartridge assembly 11 is used for the first time, the cutting blade 2 can push the blade assembly 3 and the staple pusher slider 4 together to move distally. Furthermore, after the surgery, the staple pusher slider 4 can be disassembled along with the staple cartridge 112.

[0061] For example, such as Figure 4 As shown, the elastic part 31 includes two elastic pieces 311, which correspond one-to-one with two protrusions 21. The proximal end of each elastic piece 311 has a connecting part 31c that is detachably connected to the protrusion 21.

[0062] This invention features raised features on both sides of the cutting blade to cooperate with corresponding elastic sheets, resulting in better fixation of the double elastic sheets, reliable connection, strong stability, and simple structure.

[0063] For example, such as Figure 4 As shown, the blade assembly 3 also includes a blade body portion 33 and a blade 32, with the blade 32 disposed at the distal end of the blade body portion 33. In embodiments of this invention, the blade 32 refers to one side edge of the blade assembly 3 used for cutting tissue.

[0064] For example, such as Figure 4 and Figure 5 As shown, the two elastic plates 311 are located on both sides of the blade body 33 in the third direction D3.

[0065] For example, such as Figure 4 and Figure 5 As shown, the blade assembly 3 also includes a first base 332 and a second base 333 located on both sides of the blade body 33 in the third direction D3. Each of the first base 332 and the second base 333 includes a base 3301 and an inclined surface 3302 extending obliquely from the base 3301 along the height direction D2. For example, the first base 332 and the second base 333 are axially symmetric about the blade body 33. Of course, this is merely exemplary and is not a limitation of the embodiments of this utility model.

[0066] For example, such as Figure 4 and Figure 5 As shown, the two elastic pieces 311 are a first elastic piece 311a and a second elastic piece 311b. The distal end of the first elastic piece 311a is disposed on the base 3301 of the first base 332, and the distal end of the first elastic piece 311a is located between the inclined body 3302 of the first base 332 and the blade body 33. The distal end of the second elastic piece 311b is disposed on the base 3301 of the second base 333, and the distal end of the second elastic piece 311b is located between the inclined body 3302 of the second base 333 and the blade body 33.

[0067] For example, such as Figure 4 and Figure 5As shown, when the distal end of the blade body 33 abuts against the slider body 41, the first base 332 is located between the first push pin 42 and the slider body 41, and the second base 333 is located between the second push pin 43 and the slider body 41. The distal end of the first base 332 abuts against the first push pin 42, and the distal end of the second base 333 abuts against the second push pin 43. For example, as... Figure 4 and Figure 5 As shown, the distal end of the inclined body 3302 of the first base 332 is attached to the inner layer 421 of the first push pin part 42, and the distal end of the inclined body 3302 of the second base 333 is attached to the inner layer 431 of the second push pin part 43.

[0068] Through the ingenious design of the blade assembly and push pin slider structure, this utility model not only allows for a more compact layout of the two components, but also reduces the complexity of the connection between the parts, resulting in stronger synchronization of movement and greater stability and reliability.

[0069] Figures 7-8 This is a schematic diagram illustrating the engagement state between the mating part, the elastic part, and the protrusion according to some embodiments of the present invention, wherein... Figure 7 This is a schematic diagram showing the elastic part 31 in a free state and separated from the protrusion 21. Figure 8 This is a schematic diagram showing the state of the elastic part 31 when it is pressed by the mating part 5.

[0070] For example, such as Figure 6 and Figure 7 As shown, the mating part 5 includes two pressure plates 51, which correspond one-to-one with two elastic sheets 311. The pressure plates 51 extend into sheet shapes in the axial direction D1 and the height direction D2.

[0071] For example, such as Figure 4 and Figure 7 As shown, the proximal end of the elastic sheet 311 is configured to tilt upwards toward the side away from the base 3301 in the free state (i.e., Figure 7 The proximal end of the elastic sheet 311 curves upward and is away from and does not contact the protrusion 21. For example, the position of the bottom end 511 of the pressure plate 51 in the height direction D2 is intermediate with respect to the position of the proximal end of the elastic sheet 311 in its free state (i.e.,...). Figure 7 The position of the elastic sheet 311 is between the proximal end of the elastic sheet 311 and the distal end of the elastic sheet 311, so that when the pressure plate 51 contacts the elastic sheet 311, it applies pressure to the elastic sheet 311. Thus, when the elastic sheet 311 of this invention moves towards the distal end until the proximal end reaches below the pressure plate 51, it contacts the pressure plate 51 and is subjected to downward pressure by the pressure plate 51, so that the proximal end of the elastic sheet 311 is pressed against the protrusion 21, so that the elastic sheet 311 is connected to the protrusion 21.

[0072] This invention controls the connection between the movable elastic sheet and the protrusion through the pressure plate feature set on the staple cartridge, which has strong controllability, reliable connection, simple structure, fewer required parts, and more compact overall structure.

[0073] For example, such as Figure 6 As shown, the staple cartridge 112 may also include a side guide rail structure 61, which can guide the movement of the staple pusher slider 4 and the blade assembly 3.

[0074] For example, such as Figure 4 , Figure 7 and Figure 8 As shown, the connecting portion 31c of the elastic sheet 311 includes a hook-shaped structure 301, the opening of which faces the distal end of the blade assembly 3, or the hook-shaped structure 301 facing downwards. Figure 7 The hook-shaped structure 301 is configured to engage with the protrusion 21 when the elastic sheet 311 is pressured by the mating part 5, thereby achieving a connection between the elastic part 31 and the protrusion 21. The hook-shaped structure 301 is moved by the drive of the cutting blade 2 to be positioned directly opposite the pressure plate 51, and the elastic sheet 311 is pressured by the mating part 5.

[0075] This invention achieves a snap-fit ​​connection with the protrusion through a hook-shaped structure at the end of the elastic part, resulting in a simple structure and strong connection reliability.

[0076] In this embodiment of the invention, after the elastic sheet 311 of the blade assembly 3 is connected to the protrusion 21 of the cutting blade body 2, when the cutting blade body 2 moves from the distal end to the proximal end, it pulls the blade assembly 3 to move towards the proximal end as well. This achieves the function of retracting the blade assembly 3 and the cutting blade body 2 together. The elastic sheet 311 gradually disengages from the pressure of the pressure plate 51 of the staple cartridge 112, and the hook-shaped structure 301 separates from the protrusion 21 of the cutting blade body 2. Thus, the blade assembly 3 disengages from the cutting blade body 2. After the blade retraction is completed, the elastic sheet 311 on the blade assembly 3 returns to its normal state, and the blade assembly 3 separates from the cutting blade body 2. Therefore, this invention allows the cutting blade body 2 to be reused, and the blade assembly 3 can be replaced at the same time as the staple cartridge.

[0077] In at least one embodiment of the present invention, the handle of the stapler 1000 further includes a power unit, wherein the power unit is configured to drive the cutting blade 2 to move axially. For example, the stapler may be an electric stapler, such as a laparoscopic stapler, but the embodiments of the present invention do not specifically limit the type of stapler.

[0078] In some embodiments of this utility model, the cutting and anastomosis process of the stapler may include at least one of the following steps:

[0079] (1) When the cutting blade 2 moves from the proximal end to the distal end of the stapler 1000 (i.e., moves along the first direction D11), the lower edge 23 of the cutting blade 2 contacts the staple cartridge seat 111, and the upper edge 24 pivots the anvil 12 along the inclined surface of the anvil 12 until it is parallel to the staple cartridge seat 111, that is, the clamp assembly 1 is closed, thereby completing the tissue positioning.

[0080] (2) When the forceps assembly 1 completes tissue positioning, the cutting blade 2 continues to move distally and comes into contact with the blade assembly 3. Since the blade assembly 3 and the pusher slider 4 abut against each other, the cutting blade 2 can drive the blade assembly 3 and the pusher slider 4 to move distally together. In this way, through the movement of the pusher slider 4, the staples in the staple cartridge assembly 11 are pushed out to suture the target tissue. At this time, the blade part 32 of the blade assembly 3 is close to the target tissue, the cutting blade 2 continues to move distally, and the blade assembly 3 begins to cut the sutured tissue. In this step, the elastic sheet 311 is pressed against the protrusions 21 on both sides of the cutting blade 2 by the pressure plate 51 of the staple cartridge 112 as the blade assembly 3 moves forward, thereby realizing the connection between the blade assembly 3 and the cutting blade 2.

[0081] (4) After the above-mentioned suturing and cutting, the pusher slider 4 will remain at the distal end of the staple cartridge 112 and will be disassembled together with the staple cartridge 112 after the operation. The cutting blade 2 will move towards the proximal end along the axial direction D1 (i.e., in the retraction direction, moving along the second direction D12). The cutting blade 2 and the blade assembly 3 are pulled back together. As the blade assembly 3 is pulled towards the proximal end by the cutting blade 2, the two elastic plates 311 gradually disengage from the pressure of the mating part 5 of the staple cartridge 112, and the hook structure 301 separates from the protrusion 21 of the cutting blade 2, thereby separating the blade assembly 3 from the cutting blade 2. Therefore, the cutting blade 2 can be reused and the blade assembly 3 can be replaced at the same time as the staple cartridge is replaced.

[0082] The above-described embodiment of this invention, by providing two elastic plates 311 on the blade assembly 3 and cooperating with the pressure plate of the mating part 5 in the staple cartridge assembly 11, controls the separation or connection between the blade assembly 3 and the cutting blade body 2. This overcomes the risk of the blade assembly 3 detaching during the retraction process, enabling the cutting blade body 2 to be reusable and allowing the blade assembly 3 to be replaced simultaneously when changing the staple cartridge 112. This solves the problem of the blade becoming dull and reducing cutting performance due to repeated use of the blade assembly 3. Furthermore, because the blade assembly 3 can return to the proximal end of the staple cartridge assembly after firing, the safety of the patient and instrument operator is ensured despite the sharpness of the blade surface.

[0083] The following points need to be explained:

[0084] (1) The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment. Other structures can refer to the general design.

[0085] (2) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0086] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. The protection scope of the present utility model shall be determined by the protection scope of the claims.

Claims

1. A laparoscopic anastomosis device, characterized in that, The laparoscopic stapler includes a distal and a proximal end opposite each other along its axial direction, the laparoscopic stapler comprising: handle part; A sleeve assembly is disposed at the distal end of the handle portion; A clamping body assembly that can be closed or opened is disposed at the distal end of the sleeve assembly; A cutting blade body movable along the axial direction is disposed within the sleeve assembly, wherein the cutting blade body has a protrusion that protrudes relative to the side of the cutting blade body; A blade assembly is disposed on the distal side of the cutting blade body and configured to move along a first direction or along a second direction opposite to the first direction under the drive of the cutting blade body. The first direction is the direction of movement toward the distal end of the laparoscopic stapler in the axial direction. The blade assembly includes an elastic portion that is adapted to the protrusion. A mating part is used to apply pressure to the elastic part when in contact with the elastic part, so that the elastic part moves closer to the protrusion; The blade assembly is configured such that, in a free state, the elastic portion separates from the protrusion, thereby separating the blade assembly from the cutting blade body; and, when the elastic portion moves along the first direction, it is pressed by the mating portion and connected to the protrusion, thereby detachably connecting the blade assembly to the cutting blade body.

2. The laparoscopic anastomosis device as described in claim 1, characterized in that, The clamp assembly includes a staple cartridge assembly and a staple anvil, the staple cartridge assembly and the staple anvil being rotatable relative to each other, the staple cartridge assembly including a staple cartridge seat and a staple cartridge detachably mounted on the staple cartridge seat; The staple cartridge includes the mating portion, which is located at the proximal end of the staple cartridge.

3. The laparoscopic anastomosis device as described in claim 2, characterized in that, The staple cartridge assembly also includes a staple pusher slider that is movable within the staple cartridge and configured to push the staples in the staple cartridge assembly; When the pusher slider is located at the proximal end of the staple cartridge assembly, the distal end of the blade assembly abuts against the pusher slider; The blade assembly and the pusher slider are configured to be driven by the cutting blade body to move along the first direction.

4. The laparoscopic anastomosis device as described in claim 3, characterized in that, The number of protrusions is two, and the two protrusions protrude from the two sides of the cutting blade body in a third direction, wherein the third direction is perpendicular to the axial direction and perpendicular to the height direction; The elastic portion includes two elastic sheets, each corresponding to one of the two protrusions, and each elastic sheet has a connecting portion at its proximal end that is detachably connected to the protrusion.

5. The laparoscopic anastomosis device as described in claim 4, characterized in that, The blade assembly further includes a blade body and a blade edge, wherein the blade edge is disposed at the distal end of the blade body. The two elastic plates are located on both sides of the blade body in the third direction.

6. The laparoscopic anastomosis device as described in claim 5, characterized in that, The blade assembly further includes a first base and a second base located on both sides of the blade body in the third direction, each of the first base and the second base including a base and an inclined surface extending obliquely from the base along the height direction. The two elastic sheets are a first elastic sheet and a second elastic sheet. The distal end of the first elastic piece is disposed on the base of the first base, and the distal end of the first elastic piece is located between the inclined body of the first base and the blade body portion; The distal end of the second elastic piece is disposed on the base of the second base, and the distal end of the second elastic piece is located between the inclined body of the second base and the blade body.

7. The laparoscopic anastomosis device as described in claim 6, characterized in that, The pusher slider includes a slider body and a first pusher portion and a second pusher portion located on both sides of the slider body. When the distal end of the blade body portion abuts against the slider body, the first base portion is located between the first pusher portion and the slider body, and the second base portion is located between the second pusher portion and the slider body. The distal end of the first base portion abuts against the first pusher portion, and the distal end of the second base portion abuts against the second pusher portion.

8. The laparoscopic anastomosis device as described in claim 6, characterized in that, The mating part includes two pressure plates, which correspond one-to-one with the two elastic sheets. The pressure plates extend into sheet shapes in the axial and height directions. The proximal end of the elastic sheet is configured to tilt toward the side away from the base in the free state, and the bottom end of the pressure plate is positioned in the height direction between the position of the proximal end of the elastic sheet in the free state and the position of the distal end of the elastic sheet, so that pressure is applied to the elastic sheet when the pressure plate contacts the elastic sheet.

9. The laparoscopic anastomosis device as described in claim 8, characterized in that, The connecting portion includes a hook-shaped structure with its opening facing the distal end of the blade assembly. The hook-shaped structure is configured to engage with the protrusion when the elastic sheet is pressed by the mating portion, thereby achieving a connection between the elastic portion and the protrusion.

10. The endoscopic stapler according to claim 1, wherein, The handle includes a power unit configured to drive the cutting blade body to move along the axial direction.

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