Cutter for colorectal surgery

Abstract

A cutter for colorectal surgery. The cutter comprises a cutting catheter (13) and a dilation spiral tube (2), wherein a folded fixed platform (1) is fixed to a tail part of the dilation spiral tube (2); a through arc-shaped groove is provided in a side surface of the end of the folded fixed platform (1) away from the dilation spiral tube (2), and an anti-twist slip ring (10) is rotationally connected in the through arc-shaped groove; a fixed lifting lug (18) is fixed on the circumferential inner wall of the anti-twist slip ring (10); and a support tube (11) horizontally running through the dilation spiral tube (2) is slidingly inserted at the end of the fixed lifting lug (18) away from the anti-twist slip ring (10). The cutter for colorectal surgery improves the stability of the tip of the cutting catheter (13), and the surgical field of view and operating space become wider.

Description

A cutting device for colorectal surgery Technical Field

[0001] This invention relates to the field of colorectal surgery technology, and more particularly to a cutting device for colorectal surgery. Background Technology

[0002] Colorectal surgery is one of the main methods for treating colorectal cancer, with the goal of removing the tumor while preserving intestinal function as much as possible. Due to the soft and elastic nature of the intestine, cutting at the site of the lesion on the intestinal wall can easily lead to misalignment, potentially causing air leakage or suture failure. Therefore, the timing, force, and tissue handling of the cutting instrument are crucial.

[0003] A search revealed a Chinese patent application, CN113349848B, which discloses a support device for laparoscopic colorectal surgery. The device includes a cannula and a clamping assembly. The cannula contains a drive mechanism that slides within it. The clamping assembly includes a clamping membrane, a clamping ring, a clamping skeleton, and six support rods. The clamping membrane forms a tubular structure with gaps between its two ends. The six support rods are evenly spaced along the circumference on the inner surface of the clamping membrane. However, the expansion device in this device has a complex structure, occupying a large amount of internal space and easily scratching the intestinal wall during advancement, significantly reducing the operable space during cutting.

[0004] To address the drawback of existing colorectal surgical devices having complex end structures that compress the surgical space, we propose a novel colorectal surgical cutter. Summary of the Invention

[0005] To overcome the problem of the complex structure of the end part of the existing colorectal surgical equipment, which leads to compression of the surgical space, the present invention aims to provide a colorectal surgical cutter with a simple structure that can reserve a large surgical space:

[0006] This invention provides a cutter for colorectal surgery, comprising a cutting catheter and a dilating spiral tube. A folded fixing platform is fixed to the tail end of the dilating spiral tube. A through-hole arc-shaped groove is formed on the side of the folded fixing platform away from the dilating spiral tube, and an anti-torsion slip ring is rotatably connected within the through-hole. A fixing lug is fixed to the inner circumference of the anti-torsion slip ring, and a support tube horizontally passing through the dilating spiral tube is slidably inserted into the end of the fixing lug away from the anti-torsion slip ring. An expansion mechanism is provided at the end of the support tube near the dilating spiral tube, and a strip-shaped sliding hole is formed at the end of the support tube near the expansion mechanism. A sliding locking seat is attached to the fixed seat, and symmetrical extension columns are fixed to the two sides of the fixed seat away from the support tube. The ends of the two extension columns away from the fixed seat are rotatably connected to ball-head shafts. The ends of the two ball-head shafts away from the fixed seat are respectively provided with symmetrical clamping guide wheels. The cutting guide tube is clamped by the two clamping guide wheels and can pass between them. A steel wire is fixed to the inner wall of the end of the cutting guide tube near the expansion mechanism, and the other end of the steel wire is wrapped around the cutting guide tube with a cutting half-turn. After the steel wire is wound, it turns and extends out from the other end of the cutting guide tube. A cutting edge is reserved on the inner side of the cutting half-turn.

[0007] Preferably, the expansion mechanism includes an arc-shaped plate box with its opening facing the support tube, and the arc-shaped plate box includes an inner arc plate and an outer arc plate with coaxial centerlines, and the central angle between the inner arc plate and the outer arc plate is 120 degrees. A mask cover is fixed at the opening of the arc-shaped plate box, and an installation hole for inserting the support tube is opened in the middle of the mask cover. A camera and an LED light are respectively embedded on the inner arc side of the mask cover, that is, the side close to the centerline of the inner arc plate. The entire support tube is attached to the inner wall of the expansion spiral tube.

[0008] Preferably, a worm gear ring is reserved on the outer circumference of the anti-torsion slip ring away from the expanding spiral tube, and a shaft seat is fixed near the rear side of the folded fixing platform. A worm that meshes with the worm gear ring is rotatably connected to the shaft seat, and an adjusting handwheel is fixed at the end of the worm away from the worm gear ring.

[0009] Preferably, the side of the fixed lug away from the anti-torsion slip ring has an installation hole, and the center line of the installation hole coincides with the axis of the support tube. An anti-detachment wear-resistant sleeve is engaged in the installation hole, and the wear-resistant sleeve is slidably sleeved on the outer wall of the support tube.

[0010] Preferably, a trajectory guide block is fixed to the inner wall of the end of the cutting conduit near the expansion mechanism, and the end of the trajectory guide block protruding from the conduit opening is provided with a slope extending toward the center line of the cutting conduit.

[0011] Preferably, a ball head is fixed at the end of the steel wire away from the trajectory guide block, and the diameter of the ball head is larger than the inner diameter of the cutting conduit.

[0012] Preferably, the inner and outer arc plates are respectively fixed with centripetal end plates, and symmetrical guide slip rings are inserted into the two centripetal end plates. Arc-shaped groove tubes are slidably connected in the two guide slip rings. The openings of the arc-shaped groove tubes are far from the axis of the inner arc plate, and anti-detachment slots are reserved at the bottom of the arc-shaped groove tubes. Inflation tubes are locked in the anti-detachment slots, and air bags with strip structures are set in the air bags far from the bottom of the grooves. Air tubes connected to the outside are inserted into the two inflation tubes.

[0013] Preferably, each of the inner walls of the outer arc plate is fixed with a strip-shaped baffle near the top, and the end of the strip-shaped baffle away from the outer arc plate can extend into the arc-shaped groove tube on the same side. An expansion spring is fixed on the opposite side of each of the two strip-shaped baffles, and a spring stop is fixed at one end of each strip-shaped baffle. The spring stop is inserted and fixed in the groove of the arc-shaped groove tube. A double-headed pulley frame is fixed at the middle of the top of the inner arc plate near the box opening. Two mutually symmetrical auxiliary frames are fixed on the lower surface of the outer arc plate near the top. Mutually symmetrical steering pulleys are fixed on both sides of the top of the auxiliary frames and the double-headed pulley frame. A rope fixing block is fixed on the side of each of the two arc-shaped groove tubes away from the double-headed pulley frame. An anti-detachment pulley is provided on the lower surface of the inner arc plate near the back of the guide slip ring. An adjusting pull rope is fixed on each of the two rope fixing blocks. The adjusting pull rope passes upward in sequence around the anti-detachment pulley, the steering pulley, and the support tube on the same side, and a drive mechanism is fixed thereon.

[0014] Preferably, the driving mechanism includes a fixed sleeve block sleeved and fixed to the end of the support tube away from the expansion mechanism. Two mutually symmetrical strip grooves are opened at the end of the support tube near the fixed sleeve block. A spring baffle is fixed to the inner wall of the support tube near the bottom of the strip grooves. Two mutually symmetrical rope holes are opened on the spring baffle. A return spring is fixed to the side of each rope hole near the opening of the support tube. A semi-cylindrical slide bar is fixed to the end of each return spring away from the spring baffle. Anti-reverse teeth are provided on the side of each semi-cylindrical slide bar near the strip groove. An adjusting pull rope passes through the rope hole and is fixed to the corresponding semi-cylindrical slide bar. The elastic force of the return spring is greater than that of the expansion spring. An anti-reverse abutment is slidably connected to the side of the fixed sleeve block near the return spring. A clamping spring is fixed to the opposite ends of the anti-reverse abutment. A limit block is fixed to the opposite ends of the two clamping springs, and the limit block is fixed to the surface of the fixed sleeve block.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. By setting up a ball-head shaft and clamping guide wheels that can be adjusted synchronously, and in conjunction with the setting of the expansion mechanism, when cutting the lesion site, the intestine in front of and behind the lesion site can be expanded and tightened first. Then, since the cutting end of the cutting catheter is attached to the two clamping guide wheels, the stability of the cutting catheter end is improved. Moreover, there is only one support tube above the lesion cutting operation position, which makes the surgical field of view and operating space wider.

[0017] 2. By setting up a support tube and an arc-shaped plate box attached to the inner wall of the expansion spiral tube, and with the camera and LED light facing the axis, the space and field of vision near the lesion are optimized to the greatest extent, which facilitates precise operation and improves the success rate of surgery.

[0018] 3. With the two arc-shaped grooves and the airbags embedded in the bottom of the grooves, when the expansion mechanism is extended to the rear of the lesion, simply push out the end of the two arc-shaped grooves with the airbags, and then fill the airbags with air. At this time, the area near the intestinal lesion can be expanded and tightened so that the lesion can be observed. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention during operation;

[0020] Figure 2 is a schematic diagram of the other side of the structure of the present invention during operation;

[0021] Figure 3 is a top view of the present invention;

[0022] Figure 4 is a schematic cross-sectional view of the structure along line AA in Figure 3 of this invention;

[0023] Figure 5 is a cross-sectional view of the drive mechanism in this invention;

[0024] Figure 6 is an assembly diagram of the cover and support tube in the expansion mechanism of the present invention;

[0025] Figure 7 is a schematic diagram of the structure of the airbag and arc-shaped groove tube in this invention before operation;

[0026] Figure 8 is an assembly diagram of the airbag and the arc-shaped groove tube in this invention;

[0027] Figure 9 is a schematic diagram of the guiding device in this invention.

[0028] In the diagram: 1. Folded fixed platform; 2. Expanding spiral tube; 3. Clamping guide wheel; 4. Ball head shaft; 5. Airbag; 6. Arc-shaped groove tube; 601. Spring stop block; 602. Anti-detachment groove; 7. Expansion mechanism; 8. Track guide block; 9. Fixed seat; 10. Anti-torsion slip ring; 11. Support tube; 1101. Strip groove; 12. Drive mechanism; 121. Fixed sleeve block; 122. Semi-cylindrical slide bar; 123. Return spring; 124. Anti-reverse stop rod; 25. Clamping spring; 126. Spring baffle; 13. Cutting guide tube; 14. Steel wire; 15. Worm gear ring; 16. External connecting plate; 17. Adjusting handwheel; 18. Fixing lug; 19. LED light; 20. Mask opening cover; 21. Adjusting pull rope; 22. Worm gear; 23. Anti-detachment pulley one; 24. Auxiliary frame; 25. Strip baffle one; 26. Expansion spring; 27. Guide slip ring; 28. Double-headed pulley frame; 29. ​​Steering pulley; 30. Inflation hose. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] In this embodiment, referring to Figures 1-9, this solution proposes a colorectal surgical cutter, which includes a cutting catheter 13 and an expanding spiral tube 2 that is screwed into the anus during use. A folded fixing platform 1 is detachably fixed to the tail end of the expanding spiral tube 2, i.e., the end closest to the outside of the body. A through arc-shaped groove is formed on the side of the folded fixing platform 1 away from the expanding spiral tube 2, and an anti-torsion slip ring 10 is rotatably connected within the through arc-shaped groove. A fixing lug 18 is fixed to the inner circumference of the anti-torsion slip ring 10, and a support tube 11 that horizontally passes through the expanding spiral tube 2 is slidably inserted into the end of the fixing lug 18 away from the anti-torsion slip ring 10. An expansion mechanism 7 is provided at the end of the support tube 11 near the expanding spiral tube 2, and a strip-shaped sliding hole is formed at the end of the support tube 11 near the expansion mechanism 7. The extension direction of the strip-shaped sliding hole is parallel to the extension direction of the support tube 11. A fixing seat 9 is slidably engaged in the strip-shaped sliding hole, and mutually symmetrical extension columns are fixed on both sides of the fixing seat 9 away from the support tube 11. The ends of the tubes away from the fixed base 9 are rotatably connected to ball-head shafts 4. The ends of the two ball-head shafts 4 away from the fixed base 9 are respectively provided with symmetrical clamping guide wheels 3. The cutting catheter 13 is clamped by the two clamping guide wheels 3 and can pass between them. The inner wall of the end of the cutting catheter 13 near the expansion mechanism 7 is fixed with a steel wire 14, and the other end of the steel wire 14 is wrapped around the cutting half-turn inside the cutting catheter 13. After the steel wire 14 is wound, it turns and extends out from the other end of the cutting catheter 13. The inner circle of the cutting half-turn has a cutting edge. By setting the ball-head shafts 4 and clamping guide wheels 3 that can be adjusted synchronously, and in conjunction with the setting of the expansion mechanism 7, when cutting the lesion, the intestine in front of and behind the lesion can be expanded and tightened first. Then, since the cutting end of the cutting catheter 13 is attached to the two clamping guide wheels 3, the stability of the cutting end of the cutting catheter 13 is improved. Moreover, there is only one support tube 11 above the lesion cutting operation position, which makes the surgical field and operation space wider.

[0031] Referring to Figures 2 and 6, the expansion mechanism 7 includes an arc-shaped plate box with its opening facing the support tube 11. The arc-shaped plate box includes an inner arc plate and an outer arc plate with a coaxial centerline. The entire arc-shaped plate box can pass through the expansion spiral tube 2, and the central angle between the inner arc plate and the outer arc plate is 100-150 degrees. A mask cover 20 is fixed at the opening of the arc-shaped plate box, and an installation hole for inserting the support tube 11 is opened in the middle of the mask cover 20. A camera and an LED light 19 are respectively embedded on the inner arc side of the mask cover 20, that is, the side close to the centerline of the inner arc plate. The entire support tube 11 is attached to the inner wall of the expansion spiral tube 2. By setting the support tube 11 and the arc-shaped plate box attached to the inner wall of the expansion spiral tube 2, and cooperating with the camera and LED light 19 facing the centerline, the space and field of vision near the lesion are optimized to the greatest extent, which facilitates precise operation and improves the success rate of surgery.

[0032] Referring to Figure 2, a worm gear ring 15 is reserved on the outer circumference of the anti-torsion slip ring 10 away from the expansion spiral tube 2, and a shaft seat is fixed near the rear side of the folded fixing platform 1. A worm 22 that meshes with the worm gear ring 15 is rotatably connected to the shaft seat. An adjusting handwheel 17 is fixed at the end of the worm 22 away from the worm gear ring 15. By combining the worm gear ring 15 and the worm 22, the irradiation position of the camera and the LED light 19 can be adjusted according to the location of the lesion, so as to facilitate the observation and cutting of the lesion tissue from the most suitable angle.

[0033] Referring to Figure 1, a vertical plate is reserved at the end of the folded fixed platform 1 away from the expansion spiral tube 2, and an external connecting plate 16 is fixed at the bottom of the vertical plate. Through the external connecting plate 16, the external connecting plate 16 can be fixed to the end of the robotic arm or other fixed carrier, freeing up the hands while improving the overall stability and facilitating precise internal operation.

[0034] Referring to Figure 2, a mounting hole is provided on the side of the fixed lug 18 away from the anti-torsion slip ring 10, and the center line of the mounting hole coincides with the axis of the support tube 11. An anti-detachment wear-resistant sleeve is snapped into the mounting hole. The wear-resistant sleeve is slidably fitted onto the outer wall of the support tube 11. The wear-resistant sleeve can prevent the support tube 11 from tilting or collapsing after being supported, thus ensuring the stability of the equipment during the surgical procedure.

[0035] Referring to Figure 9, a trajectory guide block 8 is fixed to the inner wall of one end of the cutting catheter 13 near the dilation mechanism 7. The end of the trajectory guide block 8 protruding from the tube opening is reserved with a slope extending towards the center line of the cutting catheter 13. The protruding cutting half-circle can be pressed down, and then the cutting half-circle can be accurately fitted onto the root of the lesion tissue so as to remove it completely.

[0036] Referring to Figure 9, a ball head is fixed at the end of the steel wire 14 away from the track guide block 8. The diameter of the ball head is larger than the inner diameter of the cutting guide tube 13, which facilitates traction during operation and also prevents the steel wire 14 from retracting into the cutting guide tube 13 during normal operation.

[0037] Referring to Figures 6 and 8, centripetal end plates are fixed at both ends of the inner and outer arc plates, and symmetrical guide slip rings 27 are inserted into the two centripetal end plates. Arc-shaped groove tubes 6 are slidably connected in the two guide slip rings 27. The opening of the arc-shaped groove tubes 6 is away from the axis of the inner arc plate, and anti-dislodgement slots 602 are reserved at the bottom of the arc-shaped groove tubes 6. Inflation tubes 30 are locked in the anti-dislodgement slots 602. Some of the inflation tubes 30 are equipped with strip-shaped air bags 5 away from the bottom of the groove. Both inflation tubes 30 are connected to air tubes that communicate with the outside. Through the two arc-shaped groove tubes 6 and the air bags 5 embedded in their groove bottoms, when the expansion mechanism 7 is extended to the rear of the lesion, it is only necessary to push out the end of the two arc-shaped groove tubes 6 with the air bags 5, and then inflate the air bags 5. At this time, the area near the intestinal lesion can be expanded and tightened to facilitate observation of the lesion.

[0038] Referring to Figures 6 and 7, strip-shaped baffles 25 are fixed to the inner wall of the outer arc plate near the top. The end of the strip-shaped baffle 25 away from the outer arc plate can extend into the arc-shaped groove tube 6 on the same side. An expansion spring 26 is fixed to the opposite side of each of the two strip-shaped baffles 25. A spring stop block 601 is fixed to one end of each strip-shaped baffle 25. The spring stop block 601 is inserted and fixed in the groove of the arc-shaped groove tube 6. A double-headed pulley frame 28 is fixed to the middle of the top of the inner arc plate near the box opening. Two mutually symmetrical auxiliary frames 24 are fixed to the lower surface of the outer arc plate near the top. The auxiliary frames 24 are connected to the double-headed pulley. Symmetrical steering pulleys 29 are fixed to both sides of the top of the frame 28; rope fixing blocks are fixed to the side of the two arc-shaped groove tubes 6 away from the double-headed pulley frame 28, and anti-detachment pulleys 23 are set on the lower surface of the inner arc plate near the back of the guide slip ring 27. Adjustable pull ropes 21 are fixed on the two rope fixing blocks. The adjustable pull ropes 21 pass upwards and pass through the anti-detachment pulleys 23, steering pulleys 29, and support tube 11 on the same side, and the drive mechanism 12 is fixed thereon. When it is necessary to control the extension of the two airbags 5 by the expansion spring 26 and the adjustable pull ropes 21, it is only necessary to slowly release the two adjustable pull ropes 21.

[0039] Referring to Figures 2 and 5, the drive mechanism 12 includes a fixed sleeve block 121 sleeved and fixed to the end of the support tube 11 away from the expansion mechanism 7. Two mutually symmetrical strip-shaped grooves 1101 are provided at the end of the support tube 11 near the fixed sleeve block 121. A spring baffle 126 is fixed to the inner wall of the support tube 11 near the bottom of the strip-shaped grooves 1101. Two mutually symmetrical rope holes are provided on the spring baffle 126. A return spring 123 is fixed to the side of each rope hole near the opening of the support tube 11. A semi-cylindrical slide bar 122 is fixed to the end of each return spring 123 away from the spring baffle 126. A stop is provided on the side of each semi-cylindrical slide bar 122 near the strip-shaped groove 1101. The teeth are retracted, and the adjusting pull rope 21 passes through the rope hole and is fixed to the corresponding semi-cylindrical slide 122. The elastic force of the return spring 123 is greater than that of the expansion spring 26. When it is necessary to pop out the two airbags 5, simply press the two semi-cylindrical slides 122 inward. The two semi-cylindrical slides 122 can adjust the push-out distance of the airbags 5 independently. The side of the fixed sleeve block 121 near the return spring 123 is slidably connected to the anti-reverse rod 124, and the two opposite ends of the anti-reverse rod 124 are fixed with the clamping spring 125. The two opposite ends of the clamping spring 125 are fixed with the limit block. The limit block is fixed on the surface of the fixed sleeve block 121, which can lock the position of the pushed semi-cylindrical slide 122.

[0040] Working principle: When using this device, first remove the dilating spiral tube 2 from the folded fixing base 1 and insert it into the end of the patient's anus and rectum. Then, fix the tail end of the dilating spiral tube 2 to the folded fixing base 1. Next, push the support tube 11 towards the lesion site, and turn on the LED light 19 and camera to observe the lesion location. Then, adjust the optimal expansion position and surgical angle by rotating the adjustment handwheel 17. After that, pull out the support tube 11 along with the dilation mechanism 7, and adjust the guiding angle of the two clamping guide wheels 3. Finally, insert the end of the cutting catheter 13 into the two clamping guide wheels. Between the guide rollers 3, they pass through the expansion spiral tube 2 and reach the lesion position again. After the expansion mechanism 7 passes the lesion position, press the two semi-cylindrical slides 122 of the drive mechanism 12. At this time, the ends of the two arc-shaped groove tubes 6 with air bags 5 are pushed out. Then, inflate the two air bags 5 until the intestine is stretched open so that the lesion position is clearly presented. Then, push the steel wire 14 to extend and enlarge the cutting half circle until it covers the lesion position. Then, slowly pull the steel wire 14 backward to cut the lesion position. Finally, postoperative care can be performed.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cutting device for colorectal surgery, comprising a cutting catheter (13) and a dilating spiral tube (2), wherein the tail end of the dilating spiral tube (2) is detachably fixed with a folded fixing platform (1), characterized in that, The folded fixing platform (1) has a through arc-shaped groove on the side away from the expanding spiral tube (2), and an anti-torsion slip ring (10) is rotatably connected in the through arc-shaped groove. A fixing lug (18) is fixed on the inner circumference of the anti-torsion slip ring (10), and a support tube (11) that passes horizontally through the expanding spiral tube (2) is slidably inserted into the end of the fixing lug (18) away from the anti-torsion slip ring (10). An expansion mechanism (7) is provided at the end of the support tube (11) near the expanding spiral tube (2), and a strip-shaped sliding hole is opened at the end of the support tube (11) near the expansion mechanism (7). A fixing seat (9) is slidably engaged in the strip-shaped sliding hole, and the fixing seat (9) is away from the support tube (11). Two symmetrical extension columns are fixed on both sides of the cutting conduit (13). The ends of the two extension columns away from the fixed seat (9) are rotatably connected to ball head shafts (4). The ends of the two ball head shafts (4) away from the fixed seat (9) are respectively provided with symmetrical clamping guide wheels (3). The cutting conduit (13) is clamped by the two clamping guide wheels (3) and can pass between them. The inner wall of the end of the cutting conduit (13) near the expansion mechanism (7) is fixed with a steel wire (14). The other end of the steel wire (14) is wrapped with a cutting half-turn inside the cutting conduit (13). After the steel wire (14) is wound, it turns and extends out from the other end of the cutting conduit (13). A cutting edge is reserved on the inner circle side of the cutting half-turn.

2. The colorectal surgical cutter according to claim 1, characterized in that, The expansion mechanism (7) includes an arc-shaped plate box with its opening facing the support tube (11). The arc-shaped plate box includes an inner arc plate and an outer arc plate with a coaxial center line. The central angle between the inner arc plate and the outer arc plate is 100 degrees to 150 degrees. An opening cover (20) is fixed at the opening of the arc-shaped plate box. An installation hole for inserting the support tube (11) is opened in the middle of the opening cover (20). A camera and an LED light (19) are respectively embedded on the inner arc side of the opening cover (20), which is close to the center line of the inner arc plate. The support tube (11) is attached to the inner wall of the expansion spiral tube (2).

3. The colorectal surgical cutter according to claim 2, characterized in that, The anti-torsion slip ring (10) has a worm gear ring (15) reserved on the outer circumference of the end away from the expansion spiral tube (2), and the folded fixed platform (1) is fixed with a shaft seat near the rear side. A worm (22) that meshes with the worm gear ring (15) is rotatably connected to the shaft seat. An adjusting handwheel (17) is fixed at the end of the worm (22) away from the worm gear ring (15).

4. The colorectal surgical cutter according to claim 1, characterized in that, The folded fixing platform (1) has a vertical plate reserved at one end away from the expansion spiral tube (2), and an external connecting plate (16) is fixed at the bottom of the vertical plate.

5. A colorectal surgical cutter according to claim 1, characterized in that, The fixed lug (18) has an installation hole on the side away from the anti-torsion slip ring (10), and the center line of the installation hole coincides with the axis of the support tube (11). An anti-detachment wear-resistant sleeve is inserted into the installation hole, and the wear-resistant sleeve is slidably sleeved on the outer wall of the support tube (11).

6. The colorectal surgical cutter according to claim 1, characterized in that, The inner wall of the cutting conduit (13) near the expansion mechanism (7) is fixed with a trajectory guide block (8), and the end of the trajectory guide block (8) protruding from the tube opening is reserved with a slope extending towards the center line of the cutting conduit (13).

7. A colorectal surgical cutter according to claim 1, characterized in that, The end of the steel wire (14) away from the trajectory guide block (8) is fixed with a ball head, the diameter of which is larger than the inner diameter of the cutting conduit (13).

8. A colorectal surgical cutter according to claim 1, characterized in that, The inner and outer arc plates are respectively fixed with centripetal end plates, and symmetrical guide slip rings (27) are inserted into the two centripetal end plates respectively. Arc-shaped groove tubes (6) are slidably connected in the two guide slip rings (27). The opening of the arc-shaped groove tube (6) is far away from the axis of the inner arc plate, and the bottom of the arc-shaped groove tube (6) is reserved with anti-detachment slots (602). An inflation tube (30) is locked in the anti-detachment slot (602), and the inflation tube (30) is far away from some airbags (5) with strip structure at the bottom of the groove. Both inflation tubes (30) are connected with air pipes that communicate with the outside.

9. A colorectal surgical cutter according to claim 8, characterized in that, The inner wall of the outer arc plate is fixed with a strip baffle (25) near the top, and the end of the strip baffle (25) away from the outer arc plate can extend into the arc-shaped groove (6) on the same side. An expansion spring (26) is fixed on the opposite side of the two strip baffles (25), and a spring stop (601) is fixed on one end of the strip baffle (25). The spring stop (601) is inserted and fixed in the groove of the arc-shaped groove (6). A double-headed pulley frame (28) is fixed at the middle of the top of the inner arc plate near the box opening. Two mutually fixed pulley frames are fixed on the lower surface of the outer arc plate near the top. A symmetrical auxiliary frame (24) is provided, and symmetrical steering pulleys (29) are fixed on both sides of the top of the auxiliary frame (24) and the double-headed pulley frame (28). A rope fixing block is fixed on the side of the two arc-shaped groove tubes (6) away from the double-headed pulley frame (28), and an anti-detachment pulley (23) is provided on the lower surface of the inner arc plate near the back of the guide slip ring (27). An adjusting pull rope (21) is fixed on the two rope fixing blocks. The adjusting pull rope (21) goes up and passes around the anti-detachment pulley (23), steering pulley (29), and support tube (11) on the same side in sequence. A drive mechanism (12) is fixed thereon.

10. A colorectal surgical cutter according to claim 9, characterized in that, The driving mechanism (12) includes a fixed sleeve (121) sleeved and fixed to the end of the support tube (11) away from the expansion mechanism (7). Two mutually symmetrical strip grooves (1101) are provided on the end of the support tube (11) near the fixed sleeve (121). A spring baffle (126) is fixed to the inner wall of the support tube (11) near the bottom of the strip grooves (1101). Two mutually symmetrical rope holes are provided on the spring baffle (126). A return spring (123) is fixed to the side of each rope hole near the opening of the support tube (11). The ends of the two return springs (123) away from the spring baffle (126) are... A semi-cylindrical slide bar (122) is fixed. The side of the semi-cylindrical slide bar (122) near the strip groove (1101) is provided with anti-reverse teeth. The adjusting pull rope (21) passes through the rope hole and is fixed on the corresponding semi-cylindrical slide bar (122). The elastic force of the return spring (123) is greater than the elastic force of the expansion spring (26). The side of the fixed sleeve block (121) near the return spring (123) is slidably connected with an anti-reverse rod (124). The two opposite ends of the anti-reverse rod (124) are fixed with a retaining spring (125). The two ends of the retaining spring (125) that are far apart are fixed with a limit block. The limit block is fixed on the surface of the fixed sleeve block (121).

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