Surgical anastomosis instrument and disassembly and assembly method thereof

Abstract

The present invention relates to the technical field of medical instruments, and discloses a surgical stapling instrument and a disassembly method thereof. The surgical stapling instrument comprises a fixed nail anvil assembly, a nail magazine assembly and an end member, wherein the nail magazine assembly is rotatably hinged to the nail anvil assembly; the end member is detachably mounted on the nail anvil assembly; wherein the end member has an inner cavity open to the proximal end, and the nail anvil assembly has a distal end portion capable of being inserted into the inner cavity; the end member comprises an elastic member extending outward from the inner cavity, and the distal end portion can be buckled with the elastic member; the disassembly method of the surgical stapling instrument comprises the following steps: the distal end portion presses the elastic member to deform, and partially inserts the inner cavity; the distal end portion is fully inserted into the inner cavity, and buckled with the restored elastic member; the distal end portion presses the elastic member to deform, and partially withdraws from the inner cavity; the distal end portion is fully withdrawn from the inner cavity, and is separated from the restored elastic member. The disassembly and assembly of the end member of the surgical stapling instrument does not require auxiliary tools, and the operation is relatively convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a surgical anastomosis instrument and a disassembly and assembly method thereof. Background Art

[0002] The stapler used in surgical operations is a surgical instrument that can remove excess tissue while suturing the patient's wound. It is widely used in the removal and anastomosis of tissues in minimally invasive surgeries such as abdominal surgery, gynecology, pediatrics and thoracic surgery. The stapler enters the human body through the cannula of the puncture device that is precisely positioned at the surgical site, and then makes a longitudinal incision in the tissue and applies sutures on the opposite side of the incision, thereby separating and anastomosing the tissue, similar to a stapler.

[0003] Typically, the stapler includes an actuator, which includes a staple magazine assembly and an anvil assembly. The staple magazine assembly is used to install suture staples and the suture staples are arranged toward the anvil assembly. The staple magazine assembly can rotate relative to the anvil assembly to clamp the tissue between the staple magazine assembly and the anvil assembly for suturing. The stapler also includes an end member arranged at the front end of the anvil assembly, and the end member can penetrate into the tissue and perform a separation operation on the tissue. The end member of most surgical staplers is integrally arranged with the anvil assembly and cannot be disassembled. When the end member needs to be replaced, the surgical stapler needs to be replaced, which is extremely inconvenient. The end member of a small number of surgical staplers is detachably connected to the anvil assembly, but the disassembly and assembly of the end member needs to be achieved through auxiliary tools, which is time-consuming and labor-intensive, and the operation is relatively inconvenient. In view of this, it is indeed necessary to propose a surgical stapler and a disassembly and assembly method thereof to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a surgical anastomosis instrument and a disassembly and assembly method thereof, which solves the technical problem in the prior art that the disassembly and assembly of the end components requires the use of auxiliary tools, which is time-consuming and labor-intensive, and the operation is relatively inconvenient.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a surgical anastomosis instrument, comprising:

[0007] a fixed anvil assembly;

[0008] A nail magazine assembly is rotatably hinged to the nail anvil assembly; and

[0009] An end member, detachably mounted on the nail anvil assembly;

[0010] Wherein, the end member has an inner cavity open to the proximal end, and the anvil assembly has a distal end portion capable of being inserted into the inner cavity; the end member includes an elastic member extending outward from the inner cavity, and the distal end portion can be buckled with the elastic member;

[0011] When the distal end portion presses the elastic member to deform, the distal end portion is partially inserted into or withdrawn from the inner cavity; when the distal end portion is fully inserted into the inner cavity, the distal end portion is engaged with the restored elastic member; when the distal end portion is fully withdrawn from the inner cavity, the distal end portion is disengaged from the restored elastic member.

[0012] The present invention also provides a method for disassembling and assembling a surgical anastomosis instrument, comprising the following steps:

[0013] The distal end portion is pressed against the elastic member to deform and partially inserted into the inner cavity;

[0014] The distal end portion is completely inserted into the inner cavity and is engaged with the restored elastic member;

[0015] The distal end portion is caused to press the elastic member to deform and partially withdraw from the inner cavity;

[0016] The distal end portion is completely withdrawn from the inner cavity and is disengaged from the restored elastic member.

[0017] Beneficial effects of the present invention:

[0018] The surgical anastomosis instrument proposed in the present invention has an end member with an inner cavity open to the proximal end, and the nail anvil assembly has a distal end portion that can be inserted into the inner cavity. The end member includes an elastic member extending outward from the inner cavity. When the distal end portion presses the elastic member to deform, the distal end portion is inserted into or withdrawn from the inner cavity. When the distal end portion is fully inserted into the inner cavity, the distal end portion is engaged with the restored elastic member; when the distal end portion is fully withdrawn from the inner cavity, the distal end portion is disengaged from the restored elastic member. The end member of the surgical anastomosis instrument can be disassembled and assembled without auxiliary tools, and the operation is relatively convenient.

[0019] The method for disassembling and assembling a surgical anastomosis instrument proposed in the present invention comprises the following steps: causing the distal end portion to press the elastic member to deform and partially insert the distal end portion into the inner cavity; causing the distal end portion to completely insert the distal end portion into the inner cavity and engage with the restored elastic member; causing the distal end portion to press the elastic member to deform and partially withdraw from the inner cavity; causing the distal end portion to completely withdraw from the inner cavity and detach from the restored elastic member. The disassembly and assembly of the terminal member of the surgical anastomosis instrument is relatively simple and does not require the use of auxiliary tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the surgical anastomosis instrument provided by the present invention;

[0021] Figure 2 is a first structural schematic diagram of the actuator and the end member provided by the present invention;

[0022] Figure 3is a second structural schematic diagram of the actuator and the end member provided by the present invention;

[0023] Figure 4 It is a schematic structural diagram of the terminal component provided by the present invention;

[0024] Figure 5 is a cross-sectional view of the end member provided by the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the terminal member and the distal end portion to be installed provided by the present invention;

[0026] Figure 7 It is a first structural schematic diagram when the terminal member provided by the present invention is installed on the distal end portion;

[0027] Figure 8 is a second structural schematic diagram when the terminal member provided by the present invention is installed on the distal end portion;

[0028] Fig. 9 is a third structural schematic diagram of the end member provided by the present invention when it is installed on the distal end portion;

[0029] Fig.10 It is a first structural schematic diagram of the end member provided by the present invention when it is removed from the distal end portion.

[0030] In the figure:

[0031] 10. Surgical stapling instrument; 11. Controller;

[0032] 20. Body rod;

[0033] 30. actuator; 31. staple cartridge assembly; 311. first tissue contact surface; 312. first longitudinal groove; 313. staple hole; 314. guide surface; 32. staple anvil assembly; 321. second tissue contact surface; 322. second longitudinal groove; 323. staple groove; 324. distal end; 325. channel; 326. inclined surface; 33. rotating shaft; 34. driving assembly;

[0034] 40. End member; 41. Inner cavity; 411. First inner surface; 412. Second inner surface; 42. Bend portion; 43. Elastic member; 431. Inner side surface; 432. Outer side surface; 433. First bending portion; 434. Second bending portion; 44. Groove. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figure 1 As shown, this embodiment provides a surgical stapling instrument 10, including a controller 11, a body rod 20 extending distally from the controller 11, and an actuator 30 located at the distal end of the body rod 20. Figure 2 and Figure 3 As shown, the actuator 30 includes a pair of correspondingly arranged jaws, which are respectively set as a nail anvil assembly 32 and a nail magazine assembly 31. The proximal end of the nail magazine assembly 31 and the proximal end of the nail anvil assembly 32 are pivotally connected, and the surfaces of the nail magazine assembly 31 and the nail anvil assembly 32 opposite to each other are defined as their respective tissue contact surfaces. The operation controller 11 can control the actuator 30 to switch between opening and closing. When the actuator 30 is opened, the tissue contact surface (first tissue contact surface 311) of the nail magazine assembly 31 and the tissue contact surface (second tissue contact surface 321) of the nail anvil assembly 32 are at an angle, and the farthest ends of the tissue contact surfaces of the two are far away from each other; when the actuator 30 is closed, the tissue contact surface of the nail magazine assembly 31 and the tissue contact surface of the nail anvil assembly 32 are roughly parallel, and the farthest ends of the tissue contact surfaces of the two are close to each other.

[0040] Continue to see Figure 2 and Figure 3 The staple cartridge assembly 31 includes a first longitudinal groove 312. On both sides of the first longitudinal groove 312, the first tissue contact surface 311 is respectively provided with three rows of staggered staple holes 313, and the staple holes 313 contain suture staples; the staple anvil assembly 32 includes a second longitudinal groove 322. On both sides of the second longitudinal groove 322, the second tissue contact surface 321 is respectively provided with staple grooves 323 corresponding to the staple holes 313. During operation, the user operates the controller 11 to close the jaws to clamp the target tissue, and then by operating the controller 11, the multiple rows of suture staples in the staple cartridge assembly 31 are pushed out and formed in the staple grooves 323 of the staple anvil assembly 32 to suture the tissue. In some anastomosis instruments, a cutting knife is also installed to cut the sutured tissue between the multiple rows of staple lines.

[0041] It should be noted that the controller 11 can be driven by a motor or manually, and can control the actuator 30 to clamp and suture tissue. Similar technologies are public technologies, which are disclosed in multiple inventions and will not be described in detail herein.

[0042] In the prior art, most surgical stapling instruments also include an end member, which is integrally arranged with the nail anvil assembly and cannot be disassembled. When the end member needs to be replaced, the surgical stapling instrument needs to be replaced, which is extremely inconvenient. The end member of a small number of surgical stapling instruments is detachably connected to the nail anvil assembly, but auxiliary tools are required to realize the disassembly and assembly of the end member, which is time-consuming and labor-intensive, and the operation is relatively inconvenient.

[0043] like Figure 2 and Figure 3 As shown, the surgical stapling instrument 10 further includes an end member 40, which can separate the target tissue from the specific tissue before the surgical stapling instrument 10 clamps the tissue. In this embodiment, the end member 40 is detachably mounted on the anvil assembly 32, such as Figure 4 and Figure 5 As shown, the end member 40 has an inner cavity 41 open to the proximal end, and the anvil assembly 32 has a distal end portion 324 that can be inserted into the inner cavity 41; the end member 40 includes an elastic member 43 extending outward from the inner cavity 41, and the distal end portion 324 can be engaged with the elastic member 43; when the distal end portion 324 presses the elastic member 43 to deform, the distal end portion 324 is partially inserted into or withdrawn from the inner cavity 41; when the distal end portion 324 is fully inserted into the inner cavity 41, the distal end portion 324 is engaged with the restored elastic member 43; when the distal end portion 324 is fully withdrawn from the inner cavity 41, the distal end portion 324 is disengaged from the restored elastic member 43.

[0044] The end member 40 of the surgical stapling instrument 10 can be detachably mounted on the distal end portion 324 of the anvil assembly 32, thereby reducing the burden on doctors and patients; no auxiliary tools are required during installation and disassembly, the operation is relatively convenient, simple and easy to learn, and the user's learning cost is low.

[0045] Optionally, the shape of the inner cavity 41 is adapted to the shape of the distal end portion 324 , and the distal end portion 324 can be engaged with the inner cavity 41 , so that the end member 40 will not shake after being installed on the distal end portion 324 , and the installation of the end member 40 is relatively stable.

[0046] Optionally, the inner cavity 41 has a first inner surface 411 close to the nail magazine assembly 31, and a gap is provided between the elastic member 43 and the first inner surface 411 to allow the distal end portion 324 to be inserted into or withdrawn, and the distal end portion 324 can be accommodated through the gap.

[0047] Furthermore, the first inner surface 411 can contact the surface of the distal end portion 324 close to the nail magazine assembly 31, so that the end member 40 will not shake after being installed on the distal end portion 324, and the installation is relatively stable.

[0048] Optionally, the inner cavity 41 has a second inner surface 412 away from the nail magazine assembly 31, and the distance between the first inner surface 411 and the second inner surface 412 at the proximal end is greater than the distance at the distal end, so that the proximal end of the elastic member 43 has a deformable space.

[0049] Optionally, the elastic member 43 can be deformed between the first inner surface 411 and the second inner surface 412 to change the gap between the elastic member 43 and the first inner surface 411 or the second inner surface 412 to achieve installation and removal of the end member 40 and the distal end portion 324 .

[0050] Optionally, the first inner surface 411 has a groove 44 that is recessed from the proximal end to the distal end. The setting of the groove 44 can avoid the distal end 324 when the end member 40 and the distal end 324 are installed, thereby avoiding the situation where the end member 40 and the distal end 324 cannot be installed due to interference.

[0051] like Figure 5As shown, the elastic member 43 includes a first bending portion 433 and a second bending portion 434 arranged from the distal end to the proximal end, the first bending portion 433 is bent toward the nail magazine assembly 31, and the second bending portion 434 is bent away from the nail magazine assembly 31, and the first bending portion 433 and the second bending portion 434 can interact with the distal portion 324, so that the elastic member 43 is engaged with the distal portion 324 when the terminal member 40 is installed on the distal portion 324; when the terminal member 40 is separated from the distal portion 324, the elastic member 43 is deformed through the interaction between the first bending portion 433 and the second bending portion 434 and the distal portion 324, so that the terminal member 40 can be separated from the distal portion 324.

[0052] Optionally, the proximal portion of the elastic member 43 extends outward from the inner cavity 41 and tilts toward the nail magazine assembly 31, so that the operator can distinguish the front and back sides of the installed end member 40 by the proximal portion of the elastic member 43 extending out of the inner cavity 41, thereby preventing the operator from installing the end member 40 upside down.

[0053] like Fig. 9 and Fig.10 As shown, the distal end portion 324 has a slope 326 toward the proximal end, and the first bend portion 433 and the second bend portion 434 can interact with the slope 326. Through the interaction between the first bend portion 433 and the second bend portion 434 and the slope 326, the slope 326 can prevent the end member 40 from slipping out of the distal end portion 324.

[0054] Alternatively, if Figure 6 As shown, the anvil assembly 32 has a channel 325 adjacent to the distal end portion 324 , and the channel 325 can accommodate the proximal end portion of the elastic member 43 to avoid the situation where the distal end portion 324 cannot extend into the end member 40 .

[0055] The end member 40 of this embodiment is detachably mounted on the anvil assembly 32. According to user needs, it can be selectively mounted to the distal end of the anvil assembly 32 or unloaded from the distal end of the anvil assembly 32. The proximal end of the staple cartridge assembly 31 and the proximal end of the anvil assembly 32 are connected by a rotating shaft 33, and the two can be switched between open and closed under the action of the drive assembly 34. In this embodiment, the anvil assembly 32 is fixedly arranged, and the staple cartridge assembly 31 is rotatably hinged to the anvil assembly 32. Specifically, the proximal end of the staple cartridge assembly 31 and the proximal end of the anvil assembly 32 are connected by a rotating shaft 33, and the two can be moved between open and closed relative to the anvil assembly 32 under the action of the drive assembly 34. The distal end of the staple cartridge assembly 31 is constructed with a guide surface 314, which is offset to the solid part of the staple cartridge assembly 31 and intersects with the distal end of the first tissue contact surface 311.

[0056] When the actuator 30 is opened, the first tissue contact surface 311 and the second tissue contact surface 321 are at an angle, and the farthest ends of the two are far away from each other; when the actuator 30 is closed, the first tissue contact surface 311 and the second tissue contact surface 321 are roughly parallel, and the farthest ends of the two are close to each other. The staple cartridge assembly 31 includes a first longitudinal groove 312, and on both sides of the first longitudinal groove 312, the first tissue contact surface 311 is respectively provided with three rows of staggered staple holes 313, and the staple holes 313 contain suture staples; the anvil assembly 32 includes a second longitudinal groove 322, and on both sides of the second longitudinal groove 322, the second tissue contact surface 321 is respectively provided with staple grooves 323 corresponding to the staple holes 313. When working, the driving assembly 34 passes through the first longitudinal groove 312 and the second longitudinal groove 322, pushes out the suture staples in the staple cartridge assembly 31, and forms the suture staples in the staple grooves 323 of the anvil assembly 32.

[0057] Specifically, the end member 40 has an inner cavity 41 open to the proximal end, and the nail anvil assembly 32 has a distal end portion 324 that can be inserted into the inner cavity 41, and the distal end portion 324 can extend into the inner cavity 41, so that the end member 40 is installed on the distal end portion 324. In this embodiment, the end member 40 includes an elastic member 43 extending outward from the inner cavity 41, and the distal end portion 324 can be buckled with the elastic member 43; in this embodiment, the elastic member 43 is made of a metal sheet, and its distal end is fixed inside the inner cavity 41, and the proximal end extends outside the inner cavity 41. The proximal end of the elastic member 43 is designed with a chamfer to prevent accidental injury to the user during operation. The elastic member 43 has an inner side surface 431 and an outer side surface 432, the inner side surface 431 is a side relatively close to the tissue contact surface of the nail anvil assembly 32, and the outer side surface 432 is a side relatively far from the tissue contact surface of the nail anvil assembly 32.

[0058] When the distal end portion 324 presses the elastic member 43 to deform, the distal end portion 324 is partially inserted into or withdrawn from the inner cavity 41; when the distal end portion 324 is fully inserted into the inner cavity 41, the distal end portion 324 is engaged with the restored elastic member 43; when the distal end portion 324 is fully withdrawn from the inner cavity 41, the distal end portion 324 is separated from the restored elastic member 43. The assembly and disassembly of the end member 40 of the surgical stapling instrument 10 does not require auxiliary tools, and the operation is relatively convenient.

[0059] like Figure 4As shown, the terminal member 40 includes a mounting portion at the proximal end and a curved portion 42 at the distal end. The mounting portion and the curved portion 42 are arranged at an angle. The curved portion 42 is curved toward the direction of the staple cartridge assembly 31. The cross-section of the curved portion 42 becomes smaller and smaller from the proximal end to the distal end to increase the guiding effect and facilitate the nail anvil assembly 32 to pass through the target tissue. The distal end is arranged in an arc shape to avoid damage to the patient. When disassembling the terminal member 40, a horizontal force is applied to the curved portion 42 away from the distal end 324 to make the terminal member 40 disengage from the distal end 324. The arrangement of the curved portion 42 facilitates the user to hold the terminal member 40 for disassembly and assembly.

[0060] Further, the shape of the inner cavity 41 matches the shape of the distal end portion 324, and the distal end portion 324 can be engaged with the inner cavity 41, so that the terminal member 40 is stably mounted on the distal end portion 324. Specifically, the distal end portion 324 is constructed as a wedge-shaped structure, that is, the distal end portion 324 gradually narrows in the width direction to facilitate passing through the target tissue. The inner cavity 41 is arranged at the proximal end of the terminal member 40, and its width is less than the width of the outer surface of the terminal member 40. Considering that the width of the terminal member 40 is comparable to the width of the anvil assembly 32, the gradually narrowing distal end portion 324 can be inserted into the inner cavity 41. The shape of the inner cavity 41 is engaged with the distal end portion 324, limiting the relative movement of the terminal member 40 and the anvil assembly 32.

[0061] Further, the inner cavity 41 has a first inner surface 411 close to the staple cartridge assembly 31 and a second inner surface 412 away from the staple cartridge assembly 31, and the elastic member 43 is disposed between the first inner surface 411 and the second inner surface 412. There is a gap between the elastic member 43 and the first inner surface 411 to allow the distal end portion 324 to be inserted or withdrawn, and the distal end portion 324 can be accommodated through the gap. When the distal end portion 324 is inserted into the gap, the first inner surface 411 can contact the surface of the distal end portion 324 close to the staple cartridge assembly 31, so that the terminal member 40 will not shake after being installed on the distal end portion 324, and the installation is relatively stable. The distance between the first inner surface 411 and the second inner surface 412 at the proximal end is greater than the distance at the distal end, and the elastic member 43 can be deformed between the first inner surface 411 and the second inner surface 412 to change the gap between the elastic member 43 and the first inner surface 411 or the second inner surface 412, thereby realizing the installation and removal of the terminal member 40 and the distal end portion 324.

[0062] In this embodiment, the first inner surface 411 has a groove 44 that is recessed from the proximal end to the distal end. Through the setting of the groove 44, when the end member 40 and the distal end portion 324 are installed, the distal end portion 324 is avoided, thereby avoiding the situation where the end member 40 and the distal end portion 324 cannot be installed due to interference.

[0063] like Figure 5As shown, in this embodiment, the elastic member 43 includes a first bending portion 433 and a second bending portion 434 arranged from the distal end to the proximal end, the first bending portion 433 bends toward the nail magazine assembly 31, that is, the first bending portion 433 bends toward the inner side surface 431, and the second bending portion 434 bends away from the nail magazine assembly 31, that is, the second bending portion 434 bends toward the outer side surface 432, the first bending portion 433 and the second bending portion 434 can interact with the distal portion 324, so that the elastic member 43 is engaged with the distal portion 324 when the terminal member 40 is installed on the distal portion 324; when the terminal member 40 is separated from the distal portion 324, the elastic member 43 is deformed through the interaction between the first bending portion 433 and the second bending portion 434 and the distal portion 324, so that the terminal member 40 can be separated from the distal portion 324.

[0064] Optionally, the proximal end portion of the elastic member 43 (the portion of the elastic member 43 located near the second bent portion 434) extends outward from the inner cavity 41 and tilts toward the staple cartridge assembly 31, so that the operator can distinguish the front and back sides of the terminal member 40 to avoid the operator from installing it upside down. Figure 6 As shown, the anvil assembly 32 has a channel 325 adjacent to the distal end portion 324 , and the channel 325 can accommodate the proximal end portion of the elastic member 43 to avoid the situation where the distal end portion 324 cannot extend into the end member 40 .

[0065] In order to prevent the end member 40 from being randomly disengaged from the distal end portion 324 after the end member 40 is installed on the distal end portion 324, the distal end portion 324 has a slope 326 facing the proximal end (see Fig. 9 and Fig.10 ), the first bending portion 433 and the second bending portion 434 can interact with the inclined surface 326, and the inclined surface 326 can hinder the end member 40 from coming out, so that the inclined surface 326 can prevent the end member 40 from coming out of the distal end portion 324.

[0066] When the distal end portion 324 presses the elastic member 43 to deform, the distal end portion 324 is partially inserted into or withdrawn from the inner cavity 41; when the distal end portion 324 is fully inserted into the inner cavity 41, the inclined surface 326 of the distal end portion 324 engages with the restored elastic member 43; when the distal end portion 324 is fully withdrawn from the inner cavity 41, the distal end portion 324 is disengaged from the restored elastic member 43.

[0067] When expressing the position in this article, the position is generally based on the doctor or patient operating the medical device. The position close to the doctor operating the medical device is the "proximal end", and the position close to the patient of the medical device is the "distal end".

[0068] The present invention also provides a method for disassembling and assembling a surgical stapling instrument, that is, disassembling and assembling the terminal member 40. The method for disassembling and assembling a surgical stapling instrument comprises the following steps:

[0069] The distal end portion 324 presses the elastic member 43 to deform and partially inserts into the inner cavity 41;

[0070] The distal end portion 324 is completely inserted into the inner cavity 41 and is engaged with the restored elastic member 43;

[0071] The distal end portion 324 presses the elastic member 43 to deform and partially withdraw from the inner cavity 41;

[0072] The distal end portion 324 is completely withdrawn from the inner cavity 41 and is disengaged from the restored elastic member 43 .

[0073] Through the above-mentioned method for disassembling and assembling the surgical stapling instrument 10 , the terminal member 40 can be easily disassembled and assembled without using auxiliary tools.

[0074] Specifically, Figure 7 As shown, when the end member 40 is installed, the end member 40 has a slight inclination angle relative to the distal end portion 324, so that a part of the structure of the distal end portion 324 is inserted into the inner cavity 41 through the opening of the inner cavity 41. During this process, the distal end of the distal end portion 324 presses against the elastic member 43, so that the elastic member 43 bends and deforms in a direction away from the first inner surface 411; Figure 8 As shown, when the end member 40 slides a distance toward the proximal end, the first inner surface 411 of the inner cavity 41 contacts the tissue contact surface of the distal end 324. At this time, the elastic member 43 reaches the maximum deformation, and its proximal end continues to slide toward the proximal end along the channel 325, so that the distal end 324 continues to extend into the inner cavity 41 in parallel with the first inner surface 411; Fig. 9 As shown, when the distal end portion 324 is fully extended into the inner cavity 41, the elastic member 43 recovers its deformation, and the inclined surface 326 of the distal end portion 324 engages with the first bending portion 433 and the second bending portion 434 of the recovered elastic member 43, and the installation is completed. At this time, the distal end portion 324 contacts the first inner surface 411.

[0075] During use, the end member 40 interacts with the tissue with a relatively small force, because excessive force may damage the tissue. The snap-fitting force generated by the elastic member 43 and the inclined surface 326 can prevent the end member 40 from separating from the anvil assembly 32.

[0076] like Fig.10 As shown, when disassembling the end member 40, the user holds the end member 40 and applies a horizontal force to the end member 40 away from the distal end portion 324, and the inclined surface 326 of the distal end portion 324 presses the elastic member 43 to make the elastic member 43 bend and deform in a direction away from the first inner surface 411, so that the elastic member 43 is separated from the inclined surface 326, and the distal end portion 324 partially withdraws from the inner cavity 41; continue to apply the horizontal force, and the end member 40 is completely separated from the distal end portion 324, and the restored elastic member 43 is separated from the distal end portion 324, and the end member 40 can be completely unloaded from the anvil assembly 32.

[0077] The surgical anastomosis instrument 10 can be disassembled and assembled by the above-mentioned disassembly and assembly method for the terminal member 40 without the need for auxiliary tools, and the disassembly and assembly is relatively convenient.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A surgical anastomosis instrument, characterized in that: include: A fixed anvil assembly (32); A nail magazine assembly (31) is rotatably hinged to the nail anvil assembly (32); and An end member (40) is detachably mounted on the anvil assembly (32) and comprises a bent portion (42) bent toward the nail magazine assembly (31); The end member (40) has an inner cavity (41) open to the proximal end, the anvil assembly (32) has a distal end (324) capable of being inserted into the inner cavity (41), and the distal end (324) has an inclined surface (326) facing the proximal end; the end member (40) includes an elastic member (43) extending outward from the inner cavity (41), the inclined surface (326) can be engaged with the elastic member (43), and the inner cavity (41) has a first inner surface (411) close to the nail magazine assembly (31); the elastic member (43) and the first inner surface (411) are connected to each other. There is a gap between the surfaces (411) to allow the distal end (324) to be inserted or withdrawn, the inner cavity (41) has a second inner surface (412) away from the nail magazine assembly (31), the distance between the first inner surface (411) and the second inner surface (412) at the proximal end is greater than the distance at the distal end, and the elastic member (43) can be deformed between the first inner surface (411) and the second inner surface (412) to change the gap between the elastic member (43) and the first inner surface (411) or the second inner surface (412); When the distal end portion (324) presses the elastic member (43) to deform, the distal end portion (324) is partially inserted into or withdrawn from the inner cavity (41); when the distal end portion (324) is fully inserted into the inner cavity (41), the distal end portion (324) is engaged with the restored elastic member (43); when the distal end portion (324) is fully withdrawn from the inner cavity (41), the distal end portion (324) is disengaged from the restored elastic member (43).

2. The surgical stapling instrument according to claim 1, characterized in that: The shape of the inner cavity (41) is adapted to the shape of the distal end portion (324), and the distal end portion (324) can be engaged with the inner cavity (41).

3. The surgical stapling instrument according to claim 1, characterized in that: The proximal end portion of the elastic member (43) extends outward from the inner cavity (41) and is inclined toward the nail magazine assembly (31).

4. The surgical stapling instrument according to claim 1, characterized in that: The first inner surface (411) is capable of contacting a surface of the distal end portion (324) close to the nail magazine assembly (31).

5. The surgical stapling instrument according to claim 1, characterized in that: The first inner surface (411) has a groove (44) that is recessed from the proximal end to the distal end.

6. The surgical stapling instrument according to claim 1, characterized in that: The elastic member (43) comprises a first bending portion (433) and a second bending portion (434) arranged from the distal end to the proximal end, the first bending portion (433) being bent toward the nail magazine assembly (31), and the second bending portion (434) being bent away from the nail magazine assembly (31), and the first bending portion (433) and the second bending portion (434) being capable of interacting with the distal end portion (324).

7. The surgical stapling instrument according to claim 6, characterized in that: The first bent portion (433) and the second bent portion (434) are capable of interacting with the inclined surface (326).

8. The surgical stapling instrument according to claim 1, characterized in that: The anvil assembly (32) has a channel (325) adjacent to the distal end (324), and the channel (325) is capable of accommodating the proximal end portion of the elastic member (43).

9. A method for disassembling and assembling a surgical anastomosis instrument, characterized in that: The surgical stapling instrument comprises a fixed nail anvil assembly (32); a nail magazine assembly (31) rotatably hinged to the nail anvil assembly (32); and an end member (40) detachably mounted on the nail anvil assembly (32) and comprising a bent portion (42) bent toward the nail magazine assembly (31); wherein the end member (40) has an inner cavity (41) open to the proximal end, the nail anvil assembly (32) has a distal portion (324) capable of being inserted into the inner cavity (41), and the distal portion (324) has an inclined surface (326) facing the proximal end; the end member (40) comprises an elastic member (43) extending outward from the inner cavity (41), and the inclined surface (326) is capable of being rotatably hinged to the elastic member (43) The inner cavity (41) has a first inner surface (411) close to the nail magazine assembly (31); there is a gap between the elastic member (43) and the first inner surface (411) to allow the distal end (324) to be inserted or withdrawn; the inner cavity (41) has a second inner surface (412) away from the nail magazine assembly (31); the distance between the first inner surface (411) and the second inner surface (412) at the proximal end is greater than the distance between the first inner surface (411) and the second inner surface (412) at the distal end; the elastic member (43) can be deformed between the first inner surface (411) and the second inner surface (412) to change the gap between the elastic member (43) and the first inner surface (411) or the second inner surface (412); The disassembly and assembly method comprises the following steps: The distal end portion (324) is caused to press the elastic member (43) to deform and partially insert into the inner cavity (41); The distal end portion (324) is completely inserted into the inner cavity (41) and is engaged with the restored elastic member (43); The distal end portion (324) is caused to press the elastic member (43) to deform and partially withdraw from the inner cavity (41); The distal end portion (324) is completely withdrawn from the inner cavity (41) and is disengaged from the restored elastic member (43).

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