Reversing structure

Abstract

The utility model provides a reversing structure, the reversing structure is applied to an anastomat, the reversing structure comprises a bending assembly, the bending assembly comprises a plurality of bending parts, the bending parts are arranged in sequence, the adjacent bending parts can rotate relatively, and the bending parts are further provided with first through cavities; the connecting piece is provided with a near end and a far end which are opposite to each other; the near end of the connecting piece sequentially penetrates through the first through cavity of each bending part and then is fixedly connected to one end of the bending assembly. The other end of the bending assembly is fixedly connected with the rigid part; when the far end of the connecting piece is in a natural state, a gap is formed between the adjacent bending parts; when the far end of the connecting piece is pulled, the adjacent bending parts are driven to abut against each other, and the multiple bending parts are bent. The problem that the rotation range of a reversing structure is small is solved, the rotation range of the anastomat is widened, and the surgical operation requirements of more positions are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a reversing structure. BACKGROUND

[0002] A surgical stapler is a minimally invasive surgical device commonly used in surgery, which replaces traditional manual suturing and is mainly used for organ stump closure and incision anastomosis in minimally invasive surgical treatment.

[0003] The existing anastomat has a reversing structure, the operating end of the anastomat is an anastomosis mechanism for implementing anastomosis, the anastomosis mechanism is connected to the reversing structure, and the operating direction and working range of the anastomosis mechanism can be changed through rotation of the reversing structure. The existing reversing structure mainly uses rotating teeth transmission or hinged connection. This connection method requires a driving mechanism at each rotation position to achieve rotation. However, due to the small size of the anastomat device and the dense internal structure, only one rotation position can be set in the actual product. Therefore, the bending angle of the reversing structure is small, which cannot meet the operation angle requirement of the surgery. In addition, since the reversing structure also has a cutting tool inside, the existing reversing structure only has one rotation position, which causes stress concentration at the rotation position and causes the cutting tool inside the reversing structure to be crushed and broken.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that it forms prior art of this application. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a reversing structure to solve the problem of small rotation range of the anastomat, improve the rotation range of the anastomat, meet the operation requirements of more positions, and reduce the crushing of the cutting tool to improve the safety of the cutting tool.

[0006] To achieve the above purpose, the present application provides a reversing structure applied to an anastomat, which comprises:

[0007] A bending assembly comprising a plurality of bending portions, the plurality of bending portions are arranged in sequence, adjacent bending portions are relatively rotatable, and the bending portions are also provided with a first through cavity;

[0008] A connecting piece having opposite proximal and distal ends; the proximal end of the connecting piece is sequentially arranged through the first through cavity of each bending portion, and is fixedly connected to one end of the bending assembly; the other end of the bending assembly is fixedly connected with a rigid piece;

[0009] When the distal end of the connecting piece is in a natural state, there is a gap between adjacent bending portions;

[0010] When the distal end of the connecting piece is subjected to a pulling force, adjacent bending portions are driven to abut against each other, and multiple bending portions are bent.

[0011] As a further improvement of the embodiment of the application, the bending portion comprises:

[0012] A spherical structure and a matching structure;

[0013] The matching structure of the bending portion is connected with the spherical structure of an adjacent bending portion, and the spherical structure can rotate in the matching structure.

[0014] As a further improvement of the embodiment of the application, the matching structure comprises:

[0015] A structural wall, which encloses a space with an opening, is provided with a curved surface structure in the thickness direction of the wall, the curved surface structure is matched with an adjacent spherical structure, and the adjacent spherical structure can abut on the curved surface structure.

[0016] As a further improvement of the embodiment of the application, the bending portion further comprises:

[0017] A through hole, which extends from the outer surface of the spherical structure to the inside of the bending portion;

[0018] A tubular structure, which extends from the inner surface of the spherical structure towards the direction of the matching structure, and the through hole is arranged in the inside of the tubular structure.

[0019] As a further improvement of the embodiment of the application, the bending assembly is located between the through tube and the anastomosis mechanism of the anastomosis device, and the reversing structure further comprises:

[0020] A stopper, which is fixedly connected to one end of the through tube close to the bending assembly.

[0021] As a further improvement of the embodiment of the application, a stepped portion is arranged on the bending portion close to the stopper, the stopper is provided with a stepped matching portion, and the stepped portion is clamped with the stepped matching portion.

[0022] As a further improvement of the embodiment of the application, the bending assembly is arranged as a snake bone tube, and the bending portion is arranged as a snake bone joint.

[0023] Or the bending assembly is arranged as a spring flexible shaft.

[0024] As a further improvement of the embodiment of the application, the bending assembly comprises:

[0025] A through cavity is arranged in the bending part, and a cutting tool of the anastomat passes through the through cavity of each bending part.

[0026] As a further improvement of the embodiment of the present application, the first through cavity and the through cavity are communicated;

[0027] In the radial section of the bending part, the section of the first through cavity is arranged as a semicircle, the section of the through cavity is arranged as a rectangle, and the semicircular section intersects the rectangular section.

[0028] As a further improvement of the embodiment of the present application, the connecting member has a gap between the center line in the length direction and the bending assembly.

[0029] Compared with the prior art, the reversing structure according to the present application has the following advantages:

[0030] By arranging a plurality of bending part assemblies in sequence in the reversing structure, the reversing structure has a plurality of bending centers, the bending radius is increased, a large-angle bending can be realized, the anastomat can be applied to operations requiring large-angle anastomosis, and the use range of the anastomat is increased. In addition, the plurality of bending parts are connected in series by the connecting member, the connecting member can be subjected to a pulling force, the plurality of bending parts abut against each other, only one driving end is arranged to realize the rotation of a plurality of rotation centers, the bending and fixing effects of the bending assembly are realized, and the operation convenience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the bending state and the unbending state of the reversing structure according to an embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of the bending assembly according to an embodiment of the present application;

[0033] Figure 3 is a front view of the bending part according to an embodiment of the present application;

[0034] Figure 4 is a top view of the bending part according to an embodiment of the present application;

[0035] Figure 5 is a partial structural schematic diagram of the anastomat according to an embodiment of the present application;

[0036] Figure 6 is a structural schematic diagram of the abutting member according to an embodiment of the present application;

[0037] Figure 7 is a structural schematic diagram of the anastomat according to an embodiment of the present application;

[0038] Figure 8 is Figure 7 is an enlarged view of A in FIG.

[0039] Explanation of Reference Numerals:

[0040] 1, anastomat; 10, bending assembly; 110, bending portion; 111, spherical structure; 112, fitting structure; 113, structure wall; 114, curved surface structure; 115, through hole; 116, tubular structure; 120, first through cavity; 130, through cavity; 20, connecting piece; 30, driving mechanism; 310, handle assembly; 311, handle body; 312, handle; 320, traction belt; 330, reversing wheel; 340, transmission set; 40, stopper; 410, step portion; 420, step fitting portion; 200, anastomosis mechanism; 201, nail seat; 202, nail cartridge base; 300, cutting assembly; 301, cutting tool; 302, first driving member; 400, through tube; 401, second through cavity; 500, handle housing. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0042] It should be noted that, unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be understood as their common meanings to those of ordinary skill in the art to which the present application belongs. The terms "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0043] In the prior art, a single bending center is provided at the bending position between the anastomat body part and the anastomosis mechanism, and the anastomat body part and the anastomosis mechanism are bent by a single shaft center, and the bending can be achieved by gear connection or hinging, and a driving structure is further required to be provided at the connection position, so that the rotation angle range of the single bending center is limited in the structure, and the large-angle rotation cannot be well achieved. For example, in the endoscopic surgery, the cavity is relatively narrow, and the rotation angle range of the joint head of the existing anastomat is small, and the tissue clamping is inconvenient, especially for the low rectal cancer anus-preserving surgery, the space of the pelvic cavity limits the angle of the anastomat entering the pelvic cavity, and the patients with low tumor position cannot remove the lesion by the anastomat.

[0044] In addition, only a single bending center is provided, and the cutting tool inside the bending part is subjected to great extrusion at the bending position, and the yield strength is easily reached, and when the cutting tool reaches the yield strength, the cutting tool fracture will cause serious medical accidents.

[0045] As shown in FIGS. 1, 2 and 3, according to the embodiment of the present application, a reversing structure is provided, and the reversing structure comprises a bending assembly 10, and the bending assembly 10 comprises a plurality of bending parts 110, and the plurality of bending parts 110 are sequentially arranged and rotatably connected with each other. Figure 1 and Figure 2 As shown in FIGS. 1, 2 and 3, according to the embodiment of the present application, a reversing structure is provided, and the reversing structure comprises a bending assembly 10, and the bending assembly 10 comprises a plurality of bending parts 110, and the plurality of bending parts 110 are sequentially arranged and rotatably connected with each other.

[0046] The reversing structure comprises a connecting piece 20, and the bending part 110 is provided with a first through cavity 120, and the connecting piece 20 has opposite distal and proximal ends, and the proximal end of the connecting piece 20 is sequentially arranged through the first through cavity 120 of each bending part 110 and is fixedly connected to one end of the bending assembly 10, so that the plurality of bending parts 110 are connected in series in the arrangement direction, and the plurality of bending parts 110 are relatively stably maintained in the arrangement state. The connecting piece 20 is fixedly connected to one end of the bending assembly 10 and is used for pulling the connecting piece 20. In the process of being tightened under the action of the pulling force, the adjacent connecting parts are gradually attached and abut against each other, and each bending part 110 rotates around the independent bending center to achieve the bending effect of the bending assembly 10. By connecting the plurality of bending parts 110 by the connecting piece 20, only one driving mechanism 30 is required to simultaneously rotate the plurality of rotation centers, and the bending assembly 10 has a plurality of rotation centers in the bending track.

[0047] When the distal end of the connecting member 20 is in a natural state, i.e. the connecting member 20 is in an undrawn state, there is a gap between adjacent bending portions 110; when the distal end of the connecting member 20 is subjected to a pulling force, the adjacent bending portions 110 are tightened, the gap between the adjacent bending portions 110 gradually disappears, until the bending portions 110 are tightly fitted, the friction between the adjacent bending portions 110 is large, so the movement between the bending portions 110 is fixed, achieving the effect of bending and fixing of the bending assembly 10.

[0048] In specific embodiments, the reversing structure is applied to the anastomat 1, and the bending assembly 10 is connected between the anastomosis mechanism 200 and the through tube 400 of the anastomat 1, and the orientation and working range of the anastomosis mechanism 200 are changed by the bending of the bending assembly 10.

[0049] In specific embodiments, as shown in Figures 3-5 The bending portion 110 includes a spherical structure 111 and a matching structure 112, the spherical structure 111 is arranged at one end of the bending portion 110, and the matching structure 112 is arranged at the other end of the bending portion 110, the spherical structure 111 and the matching structure 112 of adjacent bending portions 110 are arranged oppositely, the matching structure 112 of the bending portion 110 and the spherical structure 111 of the adjacent bending portion 110 are connected in a matching manner, and the spherical structure 111 can rotate in the matching structure 112.

[0050] The cooperation between the adjacent matching structure 112 and the spherical structure 111 allows the arrangement between the adjacent bending portions 110 to be maintained in a relatively stable state, and each bending portion 110 also has a degree of freedom of rotation. Under the pulling of the connecting member 20, the straight-line distance between the adjacent spherical structures 111 gradually decreases, and due to the degree of freedom of rotation of the spherical structure 111, the decrease in the above-mentioned straight-line distance will be manifested as the rotation of the spherical structure 111 in the matching structure 112, the angle between the axes of the adjacent bending portions 110 gradually decreases from 180 degrees, and after a certain bending angle is generated between the adjacent bending portions 110, each bending portion 110 has a separate bending center, and the arrangement of multiple bending portions 110 has multiple bending centers, which can increase the bending radius and the bending angle.

[0051] It should be noted that the more the number of bending portions 110 arranged, the more the bending centers of the bending assembly 10, and the more the stress concentration points of the cutting tool 301 located inside the bending assembly 10, which can further reduce the risk of fracture of the cutting tool 301. Alternatively, when the bending radius is large, the number of bending portions 110 can be increased to achieve a unilateral 90° bending angle, greatly increasing the application range of the anastomat 1. For example, in a low rectal cancer surgery, an anastomat 1 that can be bent by 90° can provide more angles in the pelvic cavity and can remove lesions with lower tumor positions.

[0052] In specific embodiments, as shown in Figure 3 and 4 , the fitting structure 112 includes a structure wall 113, the space surrounded by the structure wall 113 has an opening, and the curved surface structure 114 is arranged along the wall thickness direction of the structure wall 113, the curved surface structure 114 cooperates with the spherical structure 111, when the adjacent bending parts 110 are arranged, the spherical structure 111 abuts on the curved surface structure of the structure wall 113, and can rotate at the opening.

[0053] Further, the space surrounded by the structure wall 113 is the first through cavity 120 through the connecting piece 20.

[0054] Specifically, the bending part 110 further includes a through hole 115 and a tubular structure 116, the through hole 115 extends from the outer surface of the spherical structure 111 to the inside of the bending part 110, the tubular structure 116 extends from the inner surface of the spherical structure 111 to the direction of the fitting structure 112, and the through hole 115 is arranged in the inside of the tubular structure 116. The tubular structure 116 can improve the stability between the connecting piece 20 and the bending part 110.

[0055] In specific embodiments, as shown in Figure 6 , the reversing structure further includes a stop piece 40, the stop piece 40 is fixedly connected to one end of the through pipe 400 close to the bending assembly 10, a step part 410 is arranged on the bending part 110 close to the stop piece 40, the stop piece 40 is provided with a step matching part 420, and the step part 410 and the step matching part 420 are clamped.

[0056] One end of the bending assembly 10 is fixedly connected to the connecting piece 20, the other end of the bending assembly 10 abuts on the stop piece 40, the stop piece 40 is fixedly connected to the through pipe 400, which is equivalent to that the through pipe 400 and the other end of the bending assembly 10 are relatively fixed, when the bending assembly 10 is pulled in the direction of the through pipe 400 by the connecting piece 20, the first end of the bending assembly 10 is fixed, and the effect of pressing the adjacent bending parts 110 is realized.

[0057] In specific embodiments, the bending assembly 10 is arranged as a snake bone pipe, and the bending part 110 is arranged as a snake bone joint, and the connecting piece 20 drives the bending of the snake bone pipe.

[0058] Specifically, part of the side wall of the snake bone pipe is a continuous surface, and the other part of the side wall is a surface with gaps in the length direction, the connecting piece 20 is connected to one end of the snake bone pipe, the connecting piece 20 pulls the other end of the snake bone pipe, the gap in the side wall of the snake bone pipe gradually becomes smaller, and the snake bone pipe bends inward to the side with the gap.

[0059] In a specific embodiment, the bending assembly 10 is provided as a spring flexible shaft, the connecting member 20 is connected to one end of the spring flexible shaft, and the connecting member 20 has a certain gap with the center line of the spring flexible shaft. The connecting member 20 pulls the other end of the spring flexible shaft, the side of the spring flexible shaft close to the connecting member 20 is contracted, and the side of the spring flexible shaft away from the connecting member 20 is stretched, and is converted to a state of bending inward to the contracted side.

[0060] In a specific embodiment, the bending assembly 10 includes a through cavity 130, and the through cavity 130 is arranged in the bending part 110. The cutting tool 301 of the anastomat 1 passes through the through cavity 130 of each bending part 110.

[0061] It should be noted that in the prior art, the part of the anastomat 1 has a bending center. When the anastomosis mechanism 200 and the through tube 400 are bent, the through tube 400 and the cutting tool 301 inside the anastomosis mechanism 200 also bend around the bending center. At this time, the other part of the cutting tool 301 is in a straight state, and only has one bending position. The bending position of the cutting tool 301 bears a large extrusion force, and is easy to reach the yield strength, which causes the blade to break. In the present embodiment, the bending assembly 10 has multiple bending centers, and the cutting tool 301 passes through the continuous through cavities 130, which disperses the bending stress, reduces the stress concentration, does not produce sharp or right-angle bending state, increases the bending radius, and reduces the damage to the cutting blade.

[0062] In a specific embodiment, the first through cavity 120 and the through cavity 130 are in communication. In the radial section of the bending part 110, the section of the first through cavity 120 is provided as a semicircle, the section of the through cavity 130 is provided as a rectangle, and the semicircular section intersects with the rectangular section.

[0063] The rectangular section of the through cavity 130 matches the section of the cutting tool 301. When the cutting tool 301 passes through the through cavity 130, it can be kept stable in the through cavity 130. The semicircular section of the first through cavity 120 provides a gap through the connecting member 20.

[0064] Specifically, the cutting tool 301 is partially engaged in the through cavity 130, and the other part is located in the first through cavity 120 with a semicircular section. The connecting member 20 is located on both sides of the cutting tool 301, which improves the compactness of the internal structure of the bending part 110.

[0065] In a specific embodiment, as shown in FIG. 6, the first through cavity 120 and the through cavity 130 are in communication, and the first through cavity 120 is provided as a semicircle, and the through cavity 130 is provided as a rectangle. Figure 8As shown, the connecting member 20 has a gap between the center line of the length direction of the bending assembly 10, and the arrangement direction of the plurality of bending portions 110. When the connecting member 20 does not contract the bending portions 110 at the center line of the bending assembly 10, the distance between the bending portions 110 is contracted at the position where the connecting member 20 is located, so that the position where the bending portions 110 interfere with the connecting member 20 rotates, and the bending portions 110 are inwardly folded towards the side where the connecting member 20 is located, thereby controlling the bending direction of the bending assembly 10.

[0066] In specific embodiments, as shown in Figure 5 and Figure 7 As shown, the reversing structure further comprises a driving mechanism 30 connected with the connecting member 20 for pulling the connecting member 20, and the driving mechanism 30 comprises a handle assembly 310 comprising a handle body 311 and a handle 312 hinged to the handle body 311. The driving mechanism 30 further comprises a traction belt 320, a reversing wheel 330 and a transmission sleeve 340, one end of the traction belt 320 is nested in the handle 312, the other end of the traction belt 320 is nested in the transmission sleeve 340, and the reversing wheel 330 is connected in the handle body 311 so that the traction belt 320 abuts against the wheel groove of the reversing wheel 330. In operation, the operator pulls the handle 312 to pull the traction belt 320, and then the traction belt 320 moves the transmission sleeve 340, wherein the reversing wheel 330 is used to change the extension direction of the traction belt 320.

[0067] The inside of the tube 400 is a second through cavity 401, and the transmission sleeve 340 passes through the second through cavity 401, and the center line of the transmission sleeve 340 is collinear with the center line of the bending assembly 10 in the unbent state. The pulling force applied at the handle 312 can be reversed to the pulling force in the center line direction of the bending assembly 10 by the reversing wheel 330.

[0068] In addition, the reversing wheel 330 is rotationally connected in the handle body 311, so that the traction belt 320 has rolling friction when moving relative to the reversing wheel 330, which reduces the friction force compared with sliding friction.

[0069] One end of the connecting member 20 is connected with the transmission sleeve 340, the connecting member 20 passes through the first cavity, and the other end is connected with the anastomosis mechanism 200. The connecting member 20 applies a pulling force to the anastomosis mechanism 200 and the bending assembly 10, and is deformed in a bent shape with the bending of the bending assembly 10.

[0070] Further, the connecting member 20 is a flexible steel wire rope, which can be flexibly deformed with the bending of the bending assembly 10.

[0071] It should be noted that, as shown in Figure 7 and Figure 8As shown, the anastomat 1 further comprises a cutting assembly 300, and a first driving member 302 in the cutting assembly 300 also extends in the direction of the second through cavity 401 of the through tube 400, and the first driving member 302 is arranged inside the transmission sleeve 340. Inside the outer through tube 400 comprises two movement modes, which are the first driving member 302 driving the cutting tool 301 and the transmission sleeve 340 pulling the connecting member 20. By arranging the first driving member 302 inside the transmission sleeve, the two movement modes do not affect each other, and the density of the internal structure of the anastomat 1 is improved.

[0072] In specific embodiments, as shown in Figure 1 and Figure 7 An anastomat 1 is also proposed, which comprises the reversing structure mentioned in the above embodiments, the anastomat mechanism 200, the cutting assembly 300, the through tube 400 and the handle shell 500. The operation end of the anastomat 1 is the anastomat mechanism 200, one end of the anastomat mechanism 200 is connected to one end of the bending assembly 10, the other end of the bending assembly 10 is connected to one end of the through tube 400, the other end of the through tube 400 is connected to the handle shell 500, and the cutting assembly 300 is located inside the bending assembly 10, the through tube 400 and the handle shell 500. When the operator holds the handle shell 500 to operate the anastomat 1, the reversing structure is used to change the operation angle of the anastomat mechanism 200, and the working range of the anastomat mechanism 200 is increased.

[0073] The cutting assembly 300 comprises a first driving member 302 and a cutting tool 301; the cutting tool 301 sequentially passes through the through cavity 130 of each bending portion 110, and the first driving member 302 is used to drive the cutting tool 301 to move from the through cavity 130 to the anastomat mechanism 200.

[0074] As shown in Figure 8 The anastomat mechanism 200 comprises a nail abutting seat 201 and a nail magazine base 202, the nail abutting seat 201 is fixedly connected to one end of the connecting assembly, and the nail abutting seat 201 and the nail magazine base 202 are hingedly connected. When the connecting member 20 is pulled towards the through tube 400, the connecting member 20 drives the nail abutting seat 201 to close the nail magazine base 202. When the connecting member 20 is pulled, the bending of the bending assembly 10 and the closing of the anastomat mechanism 200 are simultaneously performed.

[0075] Specifically, the nail abutting seat 201 is connected to the connecting member 20 at a fixed connection node; when the connecting member 20 pulls the nail abutting seat 201 towards the outer tube, the nail abutting seat 201 has a tendency to gradually rotate at an included angle close to 180° in a state where the included angle is less than 180° between the nail abutting seat 201 and the connecting member 20, so as to close the nip between the nail abutting seat 201 and the nail magazine base 202.

[0076] In a specific embodiment, the handle body 311 is located inside the handle housing 500, the part of the handle 312 hinged with the handle body 311 is located inside the handle housing 500, and the part of the handle 312 used for holding is located outside the handle housing 500.

[0077] When the operator uses the anastomat 1, the operator holds the handle housing 500 and the handle 312, applies force to the handle 312, and rotates the handle 312 relative to the handle body 311, so that the traction belt 320 is pulled and moves with the handle 312, and then the traction belt 320 pulls the transmission assembly 340 and the connecting piece 20, and under the pulling, the connecting piece 20 moves towards the through pipe 400, and then pulls the bending part 110, so that the multiple bending parts 110 gradually fit closely, and at the same time, each bending part 110 rotates under the extrusion of each other, and the bending assembly 10 composed of the multiple bending parts 110 can achieve the bending effect of large angle and large bending radius.

[0078] The foregoing description of specific exemplary embodiments of the application is presented for the purpose of illustration and description.

[0079] These descriptions are not intended to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application, thereby enabling others skilled in the art to best utilize the application and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the application be defined by the claims and their equivalents.

Claims

1. A commutation structure, characterized by, The reversing structure is applied to an anastomat, and the reversing structure comprises: A bending assembly comprising a plurality of bending portions arranged in sequence, adjacent bending portions being relatively rotatable, the bending portions being further provided with first through cavities; A connecting member having opposite proximal and distal ends; The proximal end of the connecting member is sequentially arranged through the first through cavities of each bending portion and fixedly connected to one end of the bending assembly; the other end of the bending assembly is fixedly connected with a rigid member; When the distal end of the connecting member is in a natural state, there is a gap between adjacent bending portions; When the distal end of the connecting member is subjected to a pulling force, adjacent bending portions are driven to abut against each other, and the plurality of bending portions are bent.

2. The commutation structure of claim 1, wherein, The bending portion comprises: A spherical structure and a matching structure; The matching structure of the bending portion is in matching connection with the spherical structure of an adjacent bending portion, and the spherical structure is rotatable in the matching structure.

3. The commutation structure of claim 2, wherein, The matching structure comprises: A structural wall surrounding a space with an opening, the structural wall being provided with a curved surface structure in the thickness direction of the wall, the curved surface structure being matched with an adjacent spherical structure, and the adjacent spherical structure being abuttable on the curved surface structure.

4. The commutation structure of claim 2, wherein The bending portion further comprises: A through hole extending from the outer surface of the spherical structure to the interior of the bending portion; A tubular structure extending from the inner surface of the spherical structure towards the direction of the matching structure, the through hole being arranged in the interior of the tubular structure.

5. The commutation structure of claim 1, wherein, The bending assembly is located between a through pipe and an anastomosis mechanism of the anastomat, and the reversing structure further comprises: An abutting member fixedly connected to one end of the through pipe close to the bending assembly.

6. The commutation structure of claim 5, wherein, A step portion is arranged on the bending portion close to the abutting member, the abutting member is provided with a step matching portion, and the step portion is clamped with the step matching portion.

7. The commutation structure of claim 1, wherein, The bending assembly is arranged as a snake bone pipe, and the bending portion is arranged as a snake bone joint. Or the bending assembly is arranged as a spring flexible shaft.

8. The commutation structure of claim 1, wherein, The bending assembly comprises: A through cavity arranged in the bending portion, and a cutting tool of the anastomat being arranged through the through cavity of each bending portion.

9. The commutation structure of claim 8, wherein, The first through cavity and the through cavity are in communication; In the radial cross section of the bending portion, the cross section of the first through cavity is arranged as a semicircle, the cross section of the through cavity is arranged as a rectangle, and the cross section of the semicircle intersects with the cross section of the rectangle.

10. The commutation structure of claim 1, wherein, The connecting member has a gap with the center line in the length direction of the bending assembly.

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