A device for positioning the incision margin in rectal tumor surgery

Abstract

This invention relates to the field of medical device technology. This application discloses a surgical margin positioning device for rectal tumor surgery, including a travel hole and a travel groove. The travel hole and travel groove are distributed in a ring array. A travel rod is movably installed inside the travel hole. A mating hole is opened at the top of the travel rod. Sliding grooves are opened on both sides of the outer surface of the mating hole. A push rod is movably installed inside the sliding groove. A spring is provided at the top of the outer surface of the push rod, and the top of the spring is connected to the top of the inner wall of the travel rod. During the upward movement of the travel rod, it drives the travel rod, the ratchet rack, and the first side plate to move upward simultaneously, thereby driving the outer ring frame to move away from the main body, thus realizing the distance between the first positioner and the second positioner. This allows the operator to adjust the distance between the first positioner and the second positioner according to the size of the tumor inside the rectum. The tumor can be located with a single marking, improving the ease of operation of the device.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a resection margin positioning device for rectal tumor surgery. Background Technology

[0002] Rectal tumor surgery margin positioning devices are instruments and techniques used to accurately mark and measure the distal / proximal resection boundaries of tumors during surgery. The core goal is to ensure negative margins, avoid tumor residue, and preserve normal bowel function as much as possible. They are especially suitable for sphincter-preserving surgery for low / ultra-low rectal cancer that requires positioning and marking the tumor margin. During rectal tumor surgery, commonly used margin positioning devices are inserted through the patient's anus and into the rectum, where a staining agent is used to stain the margin position.

[0003] The existing publication CN115886707A discloses a device and method for precise positioning of the resection margin in rectal cancer, which uses a positioning rod and a marking needle to precisely position the rectum. However, in actual use, there are still certain limitations. Because a single set of positioning rods is used, the device needs to be positioned twice, which reduces accuracy and makes the operation too cumbersome. Furthermore, during use, the rectum may involuntarily contract due to foreign objects, which can easily cause the positioning device or the marking needle to damage the rectal wall. In view of this, this application proposes a resection margin positioning device for rectal tumor surgery, which aims to solve the above-mentioned problems. Summary of the Invention

[0004] This application proposes a resection margin positioning device for rectal tumor surgery, which has the advantage of marking with two sets of positioning rods at the same time, in order to solve the problems of cumbersome operation and reduced accuracy of traditional equipment.

[0005] To achieve the above objectives, this application adopts the following technical solution: a resection edge positioning device for rectal tumor surgery, comprising a main body, a travel hole at the top of the main body, a travel groove at the outer side of the top of the main body located between the travel holes, a circular hole at the outer surface of the main body near the top and located between the travel grooves, a telescopic groove at the front of the inner wall of the travel hole near the top, the circular hole penetrating the main body and communicating with the telescopic groove, a blocking plate at the inner wall of the travel hole located above the telescopic groove, a telescopic device being movably installed inside the telescopic groove, a first threaded rod being fixedly installed at the bottom of the main body, a second threaded rod being fixedly installed at the bottom of the first threaded rod, and a first adjusting bushing and a second adjusting bushing being fitted onto the outer surfaces of both the first threaded rod and the second threaded rod by means of threaded engagement.

[0006] Furthermore, the telescopic device includes a telescopic seat, the bottom of the back of the telescopic seat is provided with an inclined surface, a return spring is provided on the front of the telescopic seat near the top, a first locator is fixedly installed on the front of the telescopic seat near the bottom, and positioning grooves are fixedly installed on the back of the telescopic seat near both sides, with the bottom of the positioning grooves being provided with an inclined surface.

[0007] Furthermore, the stroke holes and stroke grooves are distributed in a circular array. A stroke rod is movably installed inside the stroke hole. A mating hole is opened at the top of the stroke rod. A limit rod is movably installed inside the mating hole. Sliding grooves are opened on both sides of the outer surface of the mating hole. A push rod is movably installed inside the sliding groove. A spring is provided at the top of the outer surface of the push rod, and the top of the spring is connected to the top of the inner wall of the stroke rod.

[0008] Furthermore, a top hole is provided at the top of the mating hole, a ratchet is provided on one side of the inner wall of the top hole, a locking tooth is provided at the bottom of the mating hole, an injection tube is provided at the output end of the locking tooth, one end of the injection tube is connected to the first positioner, a contact plate is fixedly installed on the inner wall of the mating hole above the locking tooth, a pressing block is provided on the front of the mating hole, the pressing block is in contact with the push rod, a baffle is provided on the front of the mating hole near the top, and a gap is left between the baffle and the top of the inner cavity of the stroke rod.

[0009] Furthermore, a mating strip is movably installed inside the stroke groove, a connecting plate is fixedly installed on the top of the mating strip, an outer ring frame is fixedly installed on the outer side of the top of the connecting plate, a rectangular hole is opened on the outer surface of the outer ring frame, a second positioner is movably fitted inside the rectangular hole, a first connecting piece is provided on one side of the second positioner near the top, an inner ring frame is fixedly installed on the top of the connecting plate near the inner ring, a through hole is opened on the outer surface of the inner ring frame, the through holes are distributed in a ring array, a first side plate is fixedly installed on the outer surface of the inner ring frame below the through hole, a ratchet rack is fixedly installed on the bottom of the first side plate, the ratchet rack is movably installed inside the top hole and engages with the ratchet on one side of the top hole, and a top column is fixedly installed on the top of the inner ring frame; Specifically, during the downward movement of the ratchet, it will contact the top of the contact plate and squeeze the injection tube.

[0010] Furthermore, a connecting rod is provided at the top of the second adjusting bushing near both sides, and an adjusting plate is fixedly installed at the top of the connecting rod. A second side plate is fixedly installed on the outer surface of the adjusting plate near the top. The second side plates are distributed in a circular array, and a driving device is movably sleeved at one end of the second side plate.

[0011] Furthermore, the driving device includes a rotating plate, one end of which is movably mounted with a telescopic plate via a telescopic fit. The front end of the telescopic plate is movably sleeved with the first connecting shaft piece. A tension sensor is fixedly installed at the bottom of the rotating plate near its end. A tension spring is provided on one side of the tension sensor, and one end of the tension spring is connected to the bottom of the second side plate.

[0012] Specifically, the output of the tension sensor is connected to the input of the telescopic machine via a signal connection.

[0013] Furthermore, a cover is fixedly installed on the top of the outer ring frame, a telescopic mechanism is fixedly installed on the top of the cover, and a lower pressure ring is fixedly installed on one end of the output shaft of the telescopic mechanism. The lower pressure ring is located below the cover and directly above the top column.

[0014] Furthermore, an image acquisition device is provided on the top of the cover.

[0015] This application has the following beneficial effects.

[0016] 1. The device employs two independent sets of first and second locators arranged in a ring, allowing operators to adjust the distance between the first and second locators according to the size of the tumor inside the rectum. The tumor can be located with a single marking, improving the ease of operation of the device. In contrast, the technique used in the prior art requires secondary marking, which is less convenient and also affects the accuracy of the marking.

[0017] 2. When not in use, the first positioner is in a retracted state, so that it is only extended during use, thus avoiding contamination from the external environment and improving the reliability of the device.

[0018] 3. When the rectum contracts involuntarily, it pushes the second positioner to rotate and retract it into the rectangular hole, thereby preventing the second positioner from being in the extended state and causing damage to the inner wall of the rectum, thus providing the practicality of the device.

[0019] 4. The downward movement of the limit rod will push the push rod downward synchronously through the pressure block, causing the telescopic seat to lose the positioning function of the push rod and retract into the interior of the stroke hole under the elastic force of the return spring. This causes the first positioner to retract, so that when the rectum retracts to the first positioner, the first positioner has already retracted. This avoids the problem of the first positioner being in an extended state when the rectum retracts, which could damage the inner wall of the rectum, thus improving the reliability of the device. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0021] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a structural diagram of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a cross-sectional view of the structure of the present invention; Figure 4 This is a structural diagram of the present invention; Figure 5 This is a cross-sectional view of the main structure of the present invention; Figure 6 This is a diagram of the telescopic device structure of the present invention; Figure 7 This is a schematic diagram of the stroke rod of the present invention; Figure 8 This is a cross-sectional view of the stroke rod of the present invention; Figure 9 The structure of this invention Figure 8 Enlarged view of point A in the middle; Figure 10 This is a schematic diagram of the limiting rod structure of the present invention; Figure 11 This is a schematic diagram of the lifting frame structure of the present invention; Figure 12 This is a cross-sectional view of the lifting frame structure of the present invention; Figure 13 This is a schematic diagram of the structural adjustment disc of the present invention; Figure 14 This is a diagram of the structural driving device of the present invention; Figure 15 This is a schematic diagram of the pressure ring structure of the present invention; Figure 16 This is a cross-sectional view of the pressure ring of the structure of the present invention.

[0022] In the diagram: 10. Main body seat; 11. Stroke hole; 12. Stroke groove; 13. Round hole; 14. Telescopic groove; 15. Blocking plate; 16. Telescopic device; 161. Telescopic seat; 162. Return spring; 163. First positioner; 164. Positioning groove; 17. First threaded rod; 18. Second threaded rod; 19. First adjusting bushing; 20. Second adjusting bushing; 21. Stroke rod; 22. Mating hole; 23. Limiting rod; 24. Slide groove; 25. Push rod; 26. Top hole; 27. Clamping tooth; 28. Injection tube; 29. ​​Contact plate; 30. Lower pressure block; 31. Mating strip; 32. Connecting plate; 33. Outer ring frame; 34. Rectangular hole; 35. Second positioner; 36. First connecting shaft plate; 37. Inner ring frame; 38. Through hole; 39. First side plate; 40. Ratchet; 41. Top column; 42. Connecting rod; 43. Adjusting disc; 44. Second side plate; 45. Drive device; 451. Rotating plate; 452. Telescopic plate; 453. Tension sensor; 454. Tension spring; 46. Cover; 47. Telescopic mechanism; 48. Lower pressure ring; 49. Image acquisition device. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Please refer to a surgical margin positioning device for rectal tumor surgery. Figures 1-5 The system includes a main body 10, a stroke hole 11 at the top of the main body 10, a stroke groove 12 at the outer side of the top of the main body 10 and between the stroke holes 11, a round hole 13 at the top of the outer surface of the main body 10 and between the stroke grooves 12, a telescopic groove 14 at the top of the inner wall of the stroke hole 11, the round hole 13 penetrating the main body 10 and communicating with the telescopic groove 14, a blocking piece 15 at the position above the telescopic groove 14 on the inner wall of the stroke hole 11, a telescopic device 16 movably installed inside the telescopic groove 14, a first threaded rod 17 fixedly installed at the bottom of the main body 10, a second threaded rod 18 fixedly installed at the bottom of the first threaded rod 17, and a first adjusting bushing 19 and a second adjusting bushing 20 fitted on the outer surfaces of the first threaded rod 17 and the second threaded rod 18 respectively by means of threaded engagement.

[0025] Please see Figure 6The telescopic device 16 includes a telescopic seat 161, with an inclined surface at the bottom of the back side of the telescopic seat 161. A return spring 162 is provided on the front side of the telescopic seat 161 near the top. A first positioner 163 is fixedly installed on the front side of the telescopic seat 161 near the bottom. Positioning grooves 164 are fixedly installed on the back side of the telescopic seat 161 near both sides, with the bottom of the positioning grooves 164 being inclined.

[0026] Please see Figure 3 and Figures 7-10 The stroke holes 11 and stroke grooves 12 are distributed in a circular array. A stroke rod 21 is movably installed inside the stroke hole 11. A mating hole 22 is opened at the top of the stroke rod 21. A limit rod 23 is movably installed inside the mating hole 22. Sliding grooves 24 are opened on both sides of the outer surface of the mating hole 22. A push rod 25 is movably installed inside the sliding groove 24. A spring is provided at the top of the outer surface of the push rod 25, and the top of the spring is connected to the top of the inner wall of the stroke rod 21.

[0027] During the rotation of the first adjusting bushing 19 and the upward movement of the stroke rod 21, the two ends of the push rod 25 will contact the inclined surface at the bottom of the back of the telescopic seat 161, thereby moving the telescopic seat 161 into the telescopic groove 14. This allows the first positioner 163 to extend through the round hole 13, with its front end contacting the inside of the rectum for marking and positioning. When the device is in use or in storage, the first adjusting bushing 19 can be rotated to reset it. At this time, the stroke rod 21 and the first adjusting bushing 19 reset synchronously, and the push rod 25 moves downward, causing the telescopic seat 161 to reset under the action of the reset spring 162. This causes the first positioner 163 to retract, so that it is only in the extended state during use, avoiding contamination from the external environment and improving the reliability of the device.

[0028] Please see Figures 6-10 The top of the mating hole 22 is provided with a top hole 26, and a ratchet is provided on one side of the inner wall of the top hole 26. A locking tooth 27 is provided at the bottom of the mating hole 22. A material injection tube 28 is provided at the output end of the locking tooth 27. One end of the material injection tube 28 is connected to the first positioner 163. A contact plate 29 is fixedly installed on the inner wall of the mating hole 22 above the locking tooth 27. A lower pressure block 30 is provided on the front of the mating hole 22. The lower pressure block 30 is in contact with the push rod 25. A baffle is provided on the front of the mating hole 22 near the top, and there is a gap between the baffle and the top of the inner cavity of the stroke rod 21.

[0029] The device involved in this invention employs two independent sets of first locators 163 and second locators 35 arranged in a ring, which can simultaneously mark the patient's rectum. Simultaneously, by rotating the first adjusting sleeve 19 and tightening it with threads, it moves towards the main body 10, thereby pushing the stroke rod 21 upwards. Under the engagement of the ratchet teeth and ratchet rack 40 inside the top hole 26, the upward movement of the stroke rod 21 causes the stroke rod 21, ratchet rack 40, and first side plate 39 to move upwards synchronously, thereby moving the outer ring frame 33 away from the main body 10. This achieves the desired distance between the first locator 163 and the second locator 35, allowing the operator to adjust the distance between them according to the size of the tumor inside the rectum. Tumor localization can be achieved with a single marking, improving the ease of operation of the device. In contrast, the technique used in the prior art requires secondary marking, which is less convenient and affects the accuracy of the marking.

[0030] Please see Figure 4 and Figures 11-12 A mating strip 31 is movably installed inside the stroke groove 12. A connecting plate 32 is fixedly installed on the top of the mating strip 31. An outer ring frame 33 is fixedly installed on the outer side of the top of the connecting plate 32. A rectangular hole 34 is opened on the outer surface of the outer ring frame 33. A second positioner 35 is movably fitted inside the rectangular hole 34. A first connecting shaft piece 36 is provided on one side of the second positioner 35 near the top. An inner ring frame 37 is fixedly installed on the top of the connecting plate 32 near the inner ring. A through hole 38 is opened on the outer surface of the inner ring frame 37. The through holes 38 are distributed in a ring array. A first side plate 39 is fixedly installed on the outer surface of the inner ring frame 37 below the through hole 38. A ratchet rack 40 is fixedly installed at the bottom of the first side plate 39. The ratchet rack 40 is movably installed inside the top hole 26 and engages with the ratchet on one side of the top hole 26. A top post 41 is fixedly installed on the top of the inner ring frame 37. Please see Figures 10-11 As the ratchet 40 moves downward, it will come into contact with the top of the contact plate 29 and squeeze the injection tube 28.

[0031] When the rectum contracts involuntarily and the ratchet 40 moves downward, the bottom of the ratchet 40 contacts the top of the contact plate 29, thereby squeezing the injection tube 28 and blocking it. This stops the injection of the positioning dye by the locking tooth 27, preventing the dye from entering the intestine directly and causing waste. It also avoids the problem of the dye stimulating the intestine and aggravating rectal contraction, further improving the reliability of the device.

[0032] Please see Figure 3 and Figure 13A connecting rod 42 is provided on the top of the second adjusting bushing 20 near both sides. An adjusting plate 43 is fixedly installed on the top of the connecting rod 42. A second side plate 44 is fixedly installed on the outer surface of the adjusting plate 43 near the top. The second side plates 44 are distributed in a ring array. A driving device 45 is movably sleeved on one end of the second side plate 44.

[0033] In its normal state, the second positioner 35 is located inside the rectangular hole 34. When the outer ring frame 33 moves upward and the rectangular hole 34 reaches the marked position, the second adjusting bushing 20 is rotated, causing the connecting rod 42 and the adjusting plate 43 to move downward. This also causes the second side plate 44 and the drive device 45 to move synchronously. During the movement of the drive device 45, the distance between the connection between the rotating plate 451 and the second side plate 44 and the first connecting shaft 36 is shortened, causing the second positioner 35 to rotate and extend out of the rectangular hole 34. The device allows the front end of the second locator 35 to contact the inner wall of the patient's rectum. At this time, both the second locator 35 and the first locator 163 are in the extended state, waiting to locate the resection margin of the tumor inside the patient's rectum. In addition, when the patient's rectum involuntarily contracts due to the sensation of a foreign body, the contracting rectum will first squeeze the second locator 35 and push the second locator 35 to rotate and retract into the interior of the rectangular hole 34, thereby preventing the second locator 35 from being in the extended state and causing damage to the inner wall of the rectum, thus improving the practicality of the device.

[0034] Please see Figures 11-14 The drive device 45 includes a rotating plate 451. A telescopic plate 452 is movably mounted on one end of the rotating plate 451 through a telescopic fit. The front end of the telescopic plate 452 is movably sleeved with the first connecting shaft 36. A tension sensor 453 is fixedly mounted on the bottom of the rotating plate 451 near the end. A tension spring 454 is provided on one side of the tension sensor 453. One end of the tension spring 454 is connected to the bottom of the second side plate 44.

[0035] Please see Figures 11-12 and Figures 15-16 A cover 46 is fixedly installed on the top of the outer ring frame 33, and a telescopic mechanism 47 is fixedly installed on the top of the cover 46. A pressure ring 48 is fixedly installed on one end of the output shaft of the telescopic mechanism 47. The pressure ring 48 is located below the cover 46 and directly above the top column 41.

[0036] When the second positioner 35 involuntarily contracts in the rectum due to a foreign body sensation, and rotates back into the rectangular hole 34, the height of the connection between the first coupling plate 36 and the telescopic plate 452 rises. Since the height of the rear end of the rotating plate 451 remains unchanged, the tension sensor 453 rotates towards the side closer to the second positioner 35, stretching the tension spring 454. At this time, the tension sensor 453 senses an increase in the tension of the tension spring 454 on itself. Through the output end of the tension sensor 453, it is connected to the telescopic machine 47, causing the output shaft of the telescopic machine 47 to extend and drive the lower pressure ring 48 to move downward. During the downward movement of the lower pressure ring 48, it contacts the top of the top column 41 and pushes it to move downward synchronously. At the same time, the ratchet... The ratchet 40 and the top post 41 move downwards synchronously. Since the ratchet 40 and the ratchet set on the inner wall of the top hole 26 are in a locked state, the ratchet 40 will drive the limiting rod 23 to move downwards during its downward movement. Since the lower pressure block 30 is in contact with the push rod 25, the downward movement of the limiting rod 23 will push the push rod 25 to move downwards synchronously through the lower pressure block 30, so that the telescopic seat 161 loses the positioning function of the push rod 25 and retracts into the interior of the stroke hole 11 under the elastic force of the return spring 162, thereby causing the first positioner 163 to retract. When the rectum retracts to the first positioner 163, the first positioner 163 has completed its retraction, avoiding the problem that the first positioner 163 is in an extended state when the rectum retracts and will damage the inner wall of the rectum, thus improving the reliability of the device.

[0037] Please see Figures 1-3 An image acquisition device 49 is provided on the top of the cover 46.

[0038] The method of using this invention is as follows: During use, the device is inserted into the patient's rectum through the anus, and the inside of the rectum is observed through the image acquisition device 49. By rotating the first adjusting sleeve 19 and tightening the thread, it moves towards the main body 10, thereby pushing the stroke rod 21 upward. Under the action of the ratchet and ratchet rack 40 inside the top hole 26, the upward movement of the stroke rod 21 will drive the stroke rod 21, ratchet rack 40 and the first side plate 39 to move upward simultaneously, thereby driving the outer ring frame 33 to move away from the main body 10, thereby realizing the distance between the first positioner 163 and the second positioner 35, so that the operator can adjust the first positioner 163 and the second positioner 35 according to the size of the tumor inside the rectum. The distance between 5 is such that, during the rotation of the first adjusting bushing 19 and the upward movement of the stroke rod 21, both ends of the push rod 25 will contact the inclined surface at the bottom of the back of the telescopic seat 161, thereby causing the telescopic seat 161 to move into the telescopic groove 14, so that the first positioner 163 extends through the round hole 13, and its front end contacts the inside of the rectum to achieve marking and positioning. When the device is in use or in storage, the first adjusting bushing 19 can be rotated to reset it. At this time, the stroke rod 21 and the first adjusting bushing 19 reset synchronously, and the push rod 25 moves down, causing the telescopic seat 161 to reset under the action of the reset spring 162, thereby causing the first positioner 163 to retract, so that it is only in the extended state during use. The second positioner In its normal state, the device 35 is located inside the rectangular hole 34. When the outer ring frame 33 moves upward and the rectangular hole 34 reaches the marked position, the second adjusting bushing 20 is rotated, causing the connecting rod 42 and the adjusting plate 43 to move downward. This causes the second side plate 44 and the driving device 45 to move synchronously. During the movement of the driving device 45, the distance between the connection between the rotating plate 451 and the second side plate 44 and the first connecting shaft 36 is shortened, causing the second locator 35 to rotate and extend out of the rectangular hole 34. The front end of the second locator 35 then contacts the inner wall of the patient's rectum. At this time, both the second locator 35 and the first locator 163 are in the extended state, waiting to locate the resection margin of the tumor inside the patient's rectum. When the patient's rectum involuntarily contracts due to a foreign body sensation, the contracting rectum first squeezes the second positioner 35, pushing it to rotate and retract into the rectangular hole 34. This prevents the second positioner 35 from being extended and damaging the rectal wall. When the second positioner 35 involuntarily contracts due to the rectum and retracts into the rectangular hole 34, the height of the connection between the first coupling plate 36 and the telescopic plate 452 rises. Since the rear end height of the rotating plate 451 remains constant, the tension sensor 453 rotates towards the side closer to the second positioner 35, stretching the tension spring 454. At this time, the tension sensor 453 senses an increase in the tension exerted by the tension spring 454 on itself.The tension sensor 453 is connected to the telescopic mechanism 47 via an interconnected connection. This causes the output shaft of the telescopic mechanism 47 to extend and drive the pressure ring 48 to move downwards. During the downward movement of the pressure ring 48, it contacts the top of the top post 41 and pushes it downwards synchronously. At the same time, the ratchet 40 moves downwards synchronously with the top post 41. Since the ratchet 40 is engaged with the ratchet teeth on the inner wall of the top hole 26, the downward movement of the ratchet 40 will drive the limit rod 23 to move downwards. Since the pressure block 30 is in contact with the push rod 25, the downward movement of the limit rod 23 will be driven by the pressure block 30. The push rod 25 moves downwards synchronously, causing the telescopic seat 161 to lose its positioning function and retract into the stroke hole 11 under the elastic force of the return spring 162. This causes the first positioner 163 to retract. When the rectum retracts to the first positioner 163, the first positioner 163 has completed its retraction. During the involuntary contraction of the rectum, and after the ratchet 40 moves downwards, the bottom of the ratchet 40 contacts the top of the contact plate 29, thereby squeezing and blocking the injection tube 28, thus stopping the injection of the positioning dye by the locking teeth 27.

Claims

1. A surgical margin positioning device for rectal tumor surgery, characterized in that, The system includes a main body base (10), with a travel hole (11) at its top. A travel groove (12) is located on the outer side of the top of the main body base (10) between the travel holes (11). A circular hole (13) is located on the outer surface of the main body base (10) near the top, between the travel grooves (12). A telescopic groove (14) is located on the inner wall of the travel hole (11) near the top. The circular hole (13) penetrates the main body base (10) and communicates with the telescopic groove (14). A blocking plate (15) is provided on the inner wall of the travel hole (11) above the telescopic groove (14). A telescopic device (16) is movably installed inside the telescopic groove (14). A first threaded rod (17) is fixedly installed at the bottom of the main body (10). A second threaded rod (18) is fixedly installed at the bottom of the first threaded rod (17). The outer surfaces of the first threaded rod (17) and the second threaded rod (18) are fitted with a first adjusting bushing (19) and a second adjusting bushing (20) by means of threaded engagement.

2. The surgical margin positioning device for rectal tumor surgery according to claim 1, characterized in that, The telescopic device (16) includes a telescopic seat (161), the bottom of the back of the telescopic seat (161) is provided with an inclined surface, a return spring (162) is provided on the front of the telescopic seat (161) near the top, a first locator (163) is fixedly installed on the front of the telescopic seat (161) near the bottom, and a positioning groove (164) is fixedly installed on the back of the telescopic seat (161) near both sides, the bottom of the positioning groove (164) is provided with an inclined surface.

3. The surgical margin positioning device for rectal tumor surgery according to claim 1, characterized in that, The stroke holes (11) and stroke grooves (12) are arranged in a circular array. A stroke rod (21) is movably installed inside the stroke hole (11). The bottom of the stroke rod (21) is connected to the top surface of the first adjusting bushing (19) by a sliding fit. A mating hole (22) is opened at the top of the stroke rod (21). A limit rod (23) is movably installed inside the mating hole (22). Sliding grooves (24) are opened on both sides of the outer surface of the mating hole (22). A push rod (25) is movably installed inside the sliding groove (24). A spring is provided at the top of the outer surface of the push rod (25), and the top of the spring is connected to the top of the inner wall of the stroke rod (21).

4. The surgical margin positioning device for rectal tumor surgery according to claim 3, characterized in that, The top of the mating hole (22) is provided with a top hole (26), and a ratchet is provided on one side of the inner wall of the top hole (26). A locking tooth (27) is provided at the bottom of the mating hole (22). An injection tube (28) is provided at the output end of the locking tooth (27). One end of the injection tube (28) is connected to the first positioner (163). A contact plate (29) is fixedly installed on the inner wall of the mating hole (22) above the locking tooth (27). A pressing block (30) is provided on the front of the mating hole (22). The pressing block (30) is in contact with the push rod (25). A baffle is provided on the front of the mating hole (22) near the top, and there is a gap between the baffle and the top of the inner cavity of the stroke rod (21).

5. The surgical margin positioning device for rectal tumor surgery according to claim 4, characterized in that, A mating strip (31) is movably installed inside the travel groove (12). A connecting plate (32) is fixedly installed on the top of the mating strip (31). An outer ring frame (33) is fixedly installed on the outer side of the top of the connecting plate (32). A rectangular hole (34) is opened on the outer surface of the outer ring frame (33). A second positioner (35) is movably fitted inside the rectangular hole (34). A first connecting piece (36) is provided on one side of the second positioner (35) near the top. A fixed connecting plate (32) is fixed on the top of the connecting plate (32) near the inner ring. An inner ring frame (37) is installed, and through holes (38) are provided on the outer surface of the inner ring frame (37). The through holes (38) are distributed in a ring array. A first side plate (39) is fixedly installed on the outer surface of the inner ring frame (37) below the through holes (38). A ratchet rack (40) is fixedly installed at the bottom of the first side plate (39). The ratchet rack (40) is movably installed inside the top hole (26) and engages with the ratchet on one side of the top hole (26). A top post (41) is fixedly installed on the top of the inner ring frame (37). As the ratchet (40) moves downward, it contacts the top of the contact plate (29) and squeezes the injection tube (28).

6. The surgical margin positioning device for rectal tumor surgery according to claim 5, characterized in that, The second adjusting bushing (20) has a connecting rod (42) on the top near both sides by sliding fit. The top of the connecting rod (42) is fixedly installed with an adjusting plate (43). The outer surface of the adjusting plate (43) is fixedly installed with a second side plate (44) near the top. The second side plates (44) are distributed in a ring array. One end of the second side plate (44) is movably fitted with a driving device (45).

7. The surgical margin positioning device for rectal tumor surgery according to claim 6, characterized in that, The driving device (45) includes a rotating plate (451), and a telescopic plate (452) is movably installed at one end of the rotating plate (451) through a telescopic cooperation. The front end of the telescopic plate (452) is movably sleeved with the first connecting shaft piece (36). A tension sensor (453) is fixedly installed at the bottom of the rotating plate (451) near the end. A tension spring (454) is provided on one side of the tension sensor (453). One end of the tension spring (454) is connected to the bottom of the second side plate (44). The output of the tension sensor (453) is connected to the input of the telescopic machine (47) via a signal connection.

8. The surgical margin positioning device for rectal tumor surgery according to claim 7, characterized in that, A cover (46) is fixedly installed on the top of the outer ring frame (33), and a telescopic mechanism (47) is fixedly installed on the top of the cover (46). A pressure ring (48) is fixedly installed at one end of the output shaft of the telescopic mechanism (47). The pressure ring (48) is located below the cover (46) and directly above the top column (41).

9. A surgical margin positioning device for rectal tumor surgery according to claim 8, characterized in that, An image acquisition device (49) is provided on the top of the cover (46).

Images