Device for establishing extraperitoneal operation channel

Abstract

The invention discloses a device for establishing an extraperitoneal operation channel. The device comprises a bag; one end of the pressure gauge is communicated with the bag through a pipe; the three-way valve is provided with a first connecting nozzle, a second connecting nozzle and an exhaust nozzle, and the first connecting nozzle is communicated with the other end of the pressure gauge through a pipe; and the balloon is communicated with the second mouthpiece. The device has the advantages that a good surgical operation space is provided for an extraperitoneal surgery, the surgical risk is greatly reduced, surgical operation is greatly facilitated, and good surgical quality and surgical effect are ensured; air in the bag can be prevented from flowing back to the balloon; the release speed of air is increased; the connection strength is improved; the structure is simple and control is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field related to medical devices, and in particular to a device for establishing an extraperitoneal surgical channel. Background Art

[0002] Minimally invasive laparoscopic surgery, with its advantages of minimal trauma, rapid recovery, and timely follow-up treatment, has gained favor among physicians and patients. Currently, laparoscopic surgery is available in single-port and multi-port configurations, through both intraperitoneal and extraperitoneal routes. The extraperitoneal route offers advantages such as no interference with the intestines, clear visual field, satisfactory exposure of the main abdominal area, no peritoneal damage, and reduced pelvic and abdominal adhesions. Each approach has its own advantages and disadvantages.

[0003] During existing laparoscopic surgery, after the surgical forceps enter the abdominal cavity through the patient's umbilicus, if there is tissue blocking the front of the surgical site, resulting in insufficient exposure of the surgical site tissue, for example, if the surgical site is located behind the peritoneum (such as retroperitoneal hernia repair, retroperitoneal prostatectomy, etc.), the surgical forceps need to bypass the intestines and internal organs to perform the surgical operation. Due to the interference of the intestines and internal organs, exposure is difficult, which not only makes the surgical process risky, but also makes it difficult to ensure a good surgical effect.

[0004] In summary, there is a need for a device for establishing an extraperitoneal surgical channel that can provide a good surgical operating space. Summary of the Invention

[0005] The present invention aims to overcome the deficiency of insufficient exposure of surgical site tissue in the prior art and provides a device for establishing an extraperitoneal surgical channel that can provide a good surgical operating space.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A device for establishing an extraperitoneal surgical channel, comprising: bag; a pressure gauge, one end of which is connected to the bag via a tube; A three-way valve, wherein the three-way valve is provided with a first nozzle, a second nozzle and an exhaust nozzle, and the first nozzle is connected to the other end of the pressure gauge through a pipe; A balloon is connected to the second nozzle.

[0007] When in use, the bag is inserted into the surgical incision. At this time, the first nozzle is connected to the second nozzle and the exhaust nozzle is in a closed state. The bag is inflated by squeezing the balloon (the value displayed on the pressure gauge is proportional to the degree of inflation of the bag, which is convenient for observation and control). When the bag is inflated to the size of the extraperitoneal surgical channel, the channel support device is inserted to support the formed surgical channel. Finally, the exhaust nozzle is opened, the gas in the bag is released and the bag is removed to complete the establishment of the extraperitoneal surgical channel, providing a good surgical operating space for extraperitoneal surgery, which not only greatly reduces the surgical risk, but also greatly facilitates the surgical operation, ensuring good surgical quality and surgical results.

[0008] Preferably, the shape of the bag after inflating is oval, the maximum long axis of the bag after inflating is 11 cm to 13 cm, and the maximum short axis of the bag after inflating is 6 cm to 8 cm.

[0009] Preferably, the balloon is provided with an air-inflating channel, one end of which is connected to the interior of the balloon, and the other end of which is connected to the outside air. A stopper is provided at the port at one end of the air-inflating channel. A spring bracket and a compression spring 1 are fixed to the inner side of the air-inflating channel, one end of the compression spring 1 is connected to the spring bracket, and the other end of the compression spring 1 is connected to the stopper. In a natural state, the stopper covers the port at one end of the air-inflating channel under the elastic force of the spring, blocking the air-inflating channel so that the bag can be inflated smoothly. When the balloon is squeezed, the air pressure inside the balloon is lower than the external air pressure. At this time, under the action of the air pressure difference, the external air will automatically lift the stopper and enter the balloon, automatically inflating the balloon, so that the balloon can be squeezed and inflated repeatedly.

[0010] Preferably, the shape of the balloon is elliptical, the major axis of the balloon is 6 cm to 8 cm, and the minor axis of the balloon is 3 cm to 5 cm.

[0011] Preferably, the three-way valve has a valve chamber disposed within it, and the sidewalls of the valve chamber are provided with a first through hole, a second through hole, and an exhaust through hole. The first nozzle is disposed on the surface of the three-way valve and is located at the outer end of the first through hole. The second nozzle is disposed on the surface of the three-way valve and is located at the outer end of the second through hole. The exhaust nozzle is disposed on the surface of the three-way valve and is located at the outer end of the exhaust through hole. A one-way air supply device is disposed within the second through hole, which allows the balloon to supply air to the bag in a one-way manner. A switch device is disposed on the inner wall of the valve chamber, which matches the exhaust through hole, and which switches the exhaust through hole on and off. When the user squeezes the balloon, air in the balloon enters the bag through the second through hole, the valve chamber, the first through hole, and the tube in sequence. When the balloon is deflated, air in the bag is released into the atmosphere through the tube, the first through hole, the valve chamber, and the exhaust through hole in sequence. The one-way air supply device prevents air in the bag from flowing back into the balloon, allowing the bag to remain inflated. The switch device facilitates the control of the opening or closing of the exhaust through hole.

[0012] Preferably, an annular sliding cavity is provided on the side wall of the second through hole, and the one-way air supply device includes an air baffle plate, which is positioned within and slidably connected to the annular sliding cavity. The diameter of the air baffle plate is larger than the aperture of the second through hole. One side of the air baffle plate is adjacent to the balloon and is provided with a sealing gasket. The other side of the air baffle plate is adjacent to the bag and is provided with a second compression spring. One end of the second compression spring is connected to the other side of the air baffle plate, and the other end of the second compression spring is connected to the end wall of the annular sliding cavity. The side wall of the annular sliding cavity is provided with a plurality of axial air guide grooves. In a natural state, the air baffle plate is pressed against the end wall of the annular sliding cavity (the end adjacent to the balloon) by the elastic force of the second compression spring, thereby blocking the second through hole. When inflating the balloon, the user squeezes the balloon, and the air baffle is pushed away from the end wall of the annular cavity under the thrust of the air inside the balloon, so that the air inside the balloon can flow into the bag along the axial air guide groove, thereby causing the bag to inflate; when the user releases the balloon, the air baffle is pressed against the end wall of the annular cavity (close to the end of the balloon) again under the return force of the compression spring 2, preventing the air in the bag from flowing back into the balloon.

[0013] Preferably, the first through hole and the exhaust through hole are located on adjacent side walls of the valve cavity, the switch device includes an adjusting shaft arranged in the valve cavity, the adjusting shaft is rotatably connected to the three-way valve, one end of the adjusting shaft is mounted on the inner bottom surface of the valve cavity, the other end of the adjusting shaft passes through the top surface of the valve cavity and is located outside the three-way valve, the adjusting shaft is placed on the side of the exhaust through hole and on the side away from the first through hole, a switch plate matching the exhaust through hole is fixed on the side wall of the adjusting shaft, a movable plate is further provided on the side of the switch plate close to the first through hole, the height of the switch plate and the height of the movable plate are both adapted to the height of the valve cavity, a slider is fixed on one side of the movable plate, the switch plate is provided with a sliding groove matching the slider, the slider is placed in the sliding groove and is sealed and slidably connected thereto, the other side of the movable plate contacts and is slidably connected to the side wall where the first through hole is located, a compression spring three is further provided in the sliding groove, and the other side of the movable plate is pressed against the side wall where the first through hole is located under the elastic force of the compression spring three. The user can rotate the adjustment shaft to cover or open the exhaust hole. To release the air in the bag, the user rotates the adjustment shaft to rotate the switch plate and its movable plate. During this process, the other side of the movable plate is constantly pressed against the sidewall where the first hole is located by the elastic force of compression spring 3. When the first hole and the exhaust hole are connected, the air in the bag can be smoothly discharged through the exhaust hole. The inclined surface formed by the switch plate and movable plate now guides the outflow of air, significantly increasing the speed of air release.

[0014] Preferably, the material of the tube is silicone, and the length of the tube is 9 cm to 11 cm.

[0015] Preferably, an expansion ring is provided on the outer side of the first nozzle and the outer side of the second nozzle, the expansion ring is fixedly bonded to the outer surface of the three-way valve, an annular cavity is provided inside the expansion ring, a fixed block is fixedly connected to the three-way valve, a fixed block cavity is provided inside the fixed block, the fixed block cavity and the annular cavity are communicated by a connecting pipe, a piston is provided inside the fixed block cavity, the piston and the fixed block cavity are sealed and slidably connected, an expansion medium is also provided inside the fixed block cavity, the expansion medium and the connecting pipe are located on the same side of the piston, and a piston control mechanism connected to the piston is provided on the fixed block. During installation, the end portion of the tube is sleeved onto the outside of the first nozzle, and the end portion of the balloon is sleeved onto the outside of the second nozzle. During tightening, the piston control mechanism pushes the piston toward the connecting tube, causing the expansion medium to flow into the annular cavity through the connecting tube under pressure, thereby causing the expansion ring to swell. The swollen expansion ring can firmly press the end portion of the tube against the outer wall of the first nozzle and the end portion of the balloon against the outer wall of the second nozzle, preventing them from falling off and improving the connection strength. During disassembly, the piston control mechanism pushes the piston toward the connecting tube, causing the expansion medium to flow back into the fixed block cavity through the connecting tube under negative pressure, thereby causing the expansion ring to flatten, thereby releasing the compression effect on the end portions of the tube and balloon.

[0016] Preferably, a screw hole is provided on the end wall of the fixed block cavity, and the screw hole is located on the other side of the piston. The piston control mechanism includes a threaded column, and the threaded column and the screw hole are threadedly connected. One end of the threaded column is located inside the fixed block cavity and a rotating block is fixed thereon. The piston is provided with a rotating groove that matches the rotating block, and the rotating block is installed in the rotating groove and is rotatably connected thereto. The cross-sectional shape of the piston is polygonal, and the other end of the threaded column is located outside the fixed block and a knob is fixed thereon. When the user needs to control the movement of the piston, the threaded column can be driven to move by turning the knob. At this time, the rotating block rotates in the rotating groove and the threaded column pushes the piston in the fixed block cavity to move. The structure is simple and the control is convenient.

[0017] The beneficial effects of the present invention are: providing a good surgical operating space for extraperitoneal surgery, which not only greatly reduces the surgical risk, but also greatly facilitates the surgical operation, ensuring good surgical quality and surgical effect; it can prevent the air in the bag from flowing back into the balloon; it increases the air release speed; it increases the connection strength; it has a simple structure and is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a diagram of the internal structure of the balloon; Figure 3It is a structural diagram of a three-way valve; Figure 4 yes Figure 3 Cross-sectional view at AA in the middle; Figure 5 This is the internal structure diagram of the fixed block.

[0019] Figure: 1. Bag, 2. Pressure gauge, 3. Three-way valve, 4. First nozzle, 5. Second nozzle, 6. Exhaust nozzle, 7. Tube, 8. Balloon, 9. Air supply channel, 10. Stopper, 11. Spring bracket, 12. Compression spring (1), 13. Valve chamber, 14. First through-hole, 15. Second through-hole, 16. Exhaust through-hole, 17. Annular sliding chamber, 18. Air baffle plate, 19. Sealing gasket, 20. Compression spring (2), 21. Axial air guide groove, 22. Adjustment shaft, 23. Switch plate, 24. Movable plate, 25. Slider, 26. Slide groove, 27. Compression spring (3), 28. Expansion ring, 29. Annular chamber, 30. Fixed block, 31. Fixed block cavity, 32. Connecting pipe, 33. Piston, 34. Expansion medium, 35. Screw hole, 36. Threaded column, 37. Turn block, 38. Turn slot, 39. Knob. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 5 In the embodiment described, a device for establishing an extraperitoneal surgical access comprises: Bag 1; A pressure gauge 2, one end of which is connected to the bag 1 via a tube 7; A three-way valve 3 is provided with a first nozzle 4, a second nozzle 5 and an exhaust nozzle 6. The first nozzle 4 is connected to the other end of the pressure gauge 2 via a pipe 7; The balloon 8 is connected to the second nozzle 5.

[0022] The shape of the bag 1 after inflating is oval, the maximum major axis of the bag 1 after inflating is 12 cm, and the maximum minor axis of the bag 1 after inflating is 7 cm.

[0023] The balloon 8 is provided with an air-inflation channel 9, one end of which is connected to the interior of the balloon 8, and the other end of which is connected to the outside air. A stopper 10 is provided at the port of one end of the air-inflation channel 9. A spring bracket 11 and a compression spring 12 are fixed to the inside of the air-inflation channel 9. One end of the compression spring 12 is connected to the spring bracket 11, and the other end of the compression spring 12 is connected to the stopper 10. In a natural state, the stopper 10 covers the port of one end of the air-inflation channel 9 under the elastic force of the compression spring 12, blocking the air-inflation channel 9 and allowing the bag 1 to be inflated smoothly. When the balloon 8 is squeezed, the air pressure inside the balloon 8 is lower than the external air pressure. At this time, under the action of the air pressure difference, the external air automatically lifts the stopper 10 and enters the balloon 8, automatically inflating the balloon 8, so that the balloon 8 can be squeezed and inflated repeatedly.

[0024] The shape of the balloon 8 is elliptical, the major axis of the balloon 8 is 7 cm, and the minor axis of the balloon 8 is 4 cm.

[0025] A valve cavity 13 is provided inside the three-way valve 3, and a first through hole 14, a second through hole 15 and an exhaust through hole 16 are provided on the side wall of the valve cavity 13. The first nozzle 4 is placed on the surface of the three-way valve 3 and is located at the outer port of the first through hole 14. The second nozzle 5 is placed on the surface of the three-way valve 3 and is located at the outer port of the second through hole 15. The exhaust nozzle 6 is placed on the surface of the three-way valve 3 and is located at the outer port of the exhaust through hole 16. A one-way air supply device is provided on the inner side of the second through hole 15. The one-way air supply device enables the balloon 8 to supply air to the bag 1 in a one-way manner. A switch device matching the exhaust through hole 16 is provided on the inner wall of the valve cavity 13. The switch device enables the exhaust through hole 16 to be opened or closed.

[0026] An annular cavity 17 is provided on the sidewall of the second through-hole 15. The one-way air supply device includes an air baffle 18, which is positioned within and slidably connected to the annular cavity 17. The diameter of the air baffle 18 is larger than the diameter of the second through-hole 15. One side of the air baffle 18 is adjacent to the balloon 8 and is provided with a sealing gasket 19. The other side of the air baffle 18 is adjacent to the bag 1 and is provided with a second compression spring 20. One end of the second compression spring 20 is connected to the other side of the air baffle 18, and the other end of the second compression spring 20 is connected to the end wall of the annular cavity 17. The sidewall of the annular cavity 17 is provided with a plurality of axial air guide grooves 21. In its natural state, the elastic force of the second compression spring 20 presses the air baffle 18 against the end wall of the annular cavity 17 (the end adjacent to the balloon 8), blocking the second through-hole 15. When inflating, the user squeezes the balloon 8, and the air baffle 18 is pushed away from the end wall of the annular sliding cavity 17 under the thrust of the air inside the balloon 8, so that the air inside the balloon 8 can flow into the bag 1 along the axial air guide groove 21, thereby making the bag 1 inflated; when the user releases the balloon 8, the air baffle 18 is pressed against the end wall of the annular sliding cavity 17 (the end close to the balloon 8) again under the return force of the compression spring 20, preventing the air in the bag 1 from flowing back into the balloon 8.

[0027] The first through hole 14 and the exhaust through hole 16 are located on adjacent two side walls of the valve cavity 13. The switching device includes an adjusting shaft 22 arranged in the valve cavity 13. The adjusting shaft 22 is rotatably connected to the three-way valve 3. One end of the adjusting shaft 22 is mounted on the inner bottom surface of the valve cavity 13. The other end of the adjusting shaft 22 passes through the top surface of the valve cavity 13 and is located outside the three-way valve 3. The adjusting shaft 22 is placed on the side of the exhaust through hole 16 and is located on the side away from the first through hole 14. A switch plate 23 matching the exhaust through hole 16 is fixed on the side wall of the adjusting shaft 22. The switch plate 23 is close to the first through hole 1 A movable plate 24 is also provided on one side of the valve 13. The heights of the switch plate 23 and the movable plate 24 are both adapted to the height of the valve chamber 13. A slider 25 is fixed to one side of the movable plate 24. The switch plate 23 is provided with a slide groove 26 that matches the slider 25. The slider 25 is positioned within the slide groove 26 and is in sealed sliding connection therewith. The other side of the movable plate 24 contacts and slides with the side wall where the first through hole 14 is located. A compression spring 27 is also provided within the slide groove 26. The elastic force of the compression spring 27 presses the other side of the movable plate 24 against the side wall where the first through hole 14 is located. The user can rotate the adjustment shaft 22 to cover or open the exhaust through hole 16 with the switch plate 23. When it is necessary to open the exhaust hole 16 to release the air in the bag 1, the user can rotate the adjustment shaft 22 to drive the switch plate 23 and the movable plate 24 thereon to rotate. During this process, the other side of the movable plate 24 is always pressed against the side wall where the first through hole 14 is located under the elastic force of the compression spring 3 27. When the first through hole 14 and the exhaust through hole 16 are rotated to a position where they are connected to each other, the air in the bag 1 can be smoothly discharged through the exhaust through hole 16. At this time, the inclined surface formed by the switch plate 23 and the movable plate 24 has a guiding effect on the outflow of air, which can increase the air release speed.

[0028] The material of the tube 7 is silicone and the length of the tube 7 is 10 cm.

[0029] An expansion ring 28 is provided on the outside of the first nozzle 4 and the outside of the second nozzle 5. The expansion ring 28 is fixedly bonded to the outer surface of the three-way valve 3. A ring cavity 29 is provided inside the expansion ring 28. A fixed block 30 is fixedly connected to the three-way valve 3. A fixed block cavity 31 is provided inside the fixed block 30. The fixed block cavity 31 and the ring cavity 29 are communicated through a connecting pipe 32. A piston 33 is provided inside the fixed block cavity 31. The piston 33 and the fixed block cavity 31 are sealed and slidably connected. An expansion medium 34 is also provided inside the fixed block cavity 31. The expansion medium 34 and the connecting pipe 32 are both located on the same side of the piston 33. The fixed block 30 is provided with a piston control mechanism connected to the piston 33. A screw hole 35 is provided on the end wall of the fixed block cavity 31, and the screw hole 35 is placed on the other side of the piston 33. The piston control mechanism includes a threaded column 36, and the threaded column 36 is threadedly connected to the screw hole 35. One end of the threaded column 36 is placed on the inner side of the fixed block cavity 31 and a rotating block 37 is fixed thereon. A rotating groove 38 matching the rotating block 37 is provided on the piston 33. The rotating block 37 is installed in the rotating groove 38 and is rotatably connected thereto. The cross-sectional shape of the piston 33 is polygonal. The other end of the threaded column 36 is placed on the outside of the fixed block 30 and a knob 39 is fixed thereon. During installation, the end portion of the tube 7 is sleeved on the outside of the first nozzle 4, and the end portion of the balloon 8 is sleeved on the outside of the second nozzle 5; when tightening, the user can turn the knob 39 forward to drive the threaded column 36 to move. At this time, the rotating block 37 rotates in the rotating groove 38 and the threaded column 36 pushes the piston 33 in the fixed block cavity 31 to slide toward the direction close to the connecting tube 32, so that the expansion medium 34 flows into the annular cavity 29 through the connecting tube 32 under the action of pressure, thereby causing the expansion ring 28 to bulge. The bulging expansion ring 28 can firmly press the end portion of the tube 7 against On the outer wall of the first nozzle 4, the end portion of the balloon 8 is firmly pressed against the outer wall of the second nozzle 5; when disassembling, the user can reverse the knob 39 to drive the threaded column 36 to move. At this time, the rotating block 37 rotates in the rotating groove 38 and the threaded column 36 will push the piston 33 in the fixed block cavity 31 to slide in the direction away from the connecting tube 32, so that the expansion medium 34 flows back into the fixed block cavity 31 through the connecting tube 32 under the action of negative pressure, thereby causing the expansion ring 28 to flatten, thereby releasing the pressing effect on the end portion of the tube 7 and the end portion of the balloon 8.

[0030] Working principle: When in use, the bag 1 is inserted into the surgical incision. At this time, the first nozzle 4 and the second nozzle 5 on the three-way valve 3 are connected and the exhaust nozzle 6 is in the closed state. The bag 1 is inflated by squeezing the balloon 8. The value displayed on the pressure gauge 2 is proportional to the degree of inflation of the bag 1. When the bag 1 is inflated to the size of the extraperitoneal surgical channel, the channel support device is placed in to support the formed surgical channel. Finally, the exhaust nozzle 6 is opened to release the gas in the bag 1 and the bag 1 is taken out to complete the establishment of the extraperitoneal surgical channel, providing a good surgical operating space for extraperitoneal surgery.

Claims

1. A device for establishing an extraperitoneal surgical channel, characterized in that: include: bag (1); a pressure gauge (2), one end of the pressure gauge (2) being connected to the bag (1) via a tube (7); A three-way valve (3), wherein the three-way valve (3) is provided with a first nozzle (4), a second nozzle (5) and an exhaust nozzle (6), and the first nozzle (4) is connected to the other end of the pressure gauge (2) via a pipe (7); A balloon (8), wherein the balloon (8) is connected to the second nozzle (5).

2. The device for establishing an extraperitoneal surgical channel according to claim 1, characterized in that: The shape of the bag (1) after inflating is oval, the maximum long axis of the bag (1) after inflating is 11 cm to 13 cm, and the maximum short axis of the bag (1) after inflating is 6 cm to 8 cm.

3. The device for establishing an extraperitoneal surgical channel according to claim 1, characterized in that: The balloon (8) is provided with an air supply channel (9), one end of which is connected to the interior of the balloon (8), and the other end of which is connected to the external air. A stopper (10) is provided at the port of one end of the air supply channel (9), and a spring bracket (11) and a compression spring (12) are fixed on the inner side of the air supply channel (9), one end of which is connected to the spring bracket (11), and the other end of which is connected to the stopper (10).

4. The device for establishing an extraperitoneal surgical channel according to claim 3, characterized in that: The shape of the balloon (8) is elliptical, the major axis of the balloon (8) is 6 cm to 8 cm, and the minor axis of the balloon (8) is 3 cm to 5 cm.

5. The device for establishing an extraperitoneal surgical channel according to claim 1, characterized in that: The three-way valve (3) is provided with a valve cavity (13) inside, and the side wall of the valve cavity (13) is provided with a first through hole (14), a second through hole (15) and an exhaust through hole (16). The first nozzle (4) is placed on the surface of the three-way valve (3) and is located at the outer end of the first through hole (14). The second nozzle (5) is placed on the surface of the three-way valve (3) and is located at the outer end of the second through hole (15). The exhaust nozzle (6) is placed on the surface of the three-way valve (3) and is located at the outer end of the exhaust through hole (16). A one-way air supply device is provided on the inner side of the second through hole (15). The one-way air supply device enables the balloon (8) to supply air to the bag (1) in a one-way manner. A switch device matching the exhaust through hole (16) is provided on the inner wall of the valve cavity (13). The switch device enables the exhaust through hole (16) to be opened or closed.

6. The device for establishing an extraperitoneal surgical channel according to claim 5, characterized in that: An annular sliding cavity (17) is provided on the side wall of the second through hole (15), and the one-way air supply device includes an air baffle (18), which is placed in the annular sliding cavity (17) and is slidably connected thereto, and the diameter of the air baffle (18) is larger than the aperture of the second through hole (15), one side of the air baffle (18) is close to the balloon (8) and is provided with a sealing gasket (19), and the other side of the air baffle (18) is close to the bag (1) and is provided with a compression spring 2 (20), one end of the compression spring 2 (20) is connected to the other side of the air baffle (18), and the other end of the compression spring 2 (20) is connected to the end wall of the annular sliding cavity (17), and a plurality of axial air guide grooves (21) are provided on the side wall of the annular sliding cavity (17).

7. The device for establishing an extraperitoneal surgical channel according to claim 5, characterized in that: The first through hole (14) and the exhaust through hole (16) are located on adjacent side walls of the valve cavity (13); the switch device includes an adjusting shaft (22) arranged in the valve cavity (13); the adjusting shaft (22) and the three-way valve (3) are rotatably connected; one end of the adjusting shaft (22) is mounted on the inner bottom surface of the valve cavity (13); the other end of the adjusting shaft (22) passes through the top surface of the valve cavity (13) and is located outside the three-way valve (3); the adjusting shaft (22) is placed on the side of the exhaust through hole (16) and on the side away from the first through hole (14); a switch plate (23) matching the exhaust through hole (16) is fixed on the side wall of the adjusting shaft (22); the switch plate (23) is close to the first through hole A movable plate (24) is also provided on one side of (14), and the height of the switch plate (23) and the height of the movable plate (24) are both adapted to the height of the valve cavity (13). A slider (25) is fixed on one side of the movable plate (24), and a slide groove (26) matching the slider (25) is provided on the switch plate (23). The slider (25) is placed in the slide groove (26) and is sealed and slidably connected thereto. The other side of the movable plate (24) contacts the side wall where the first through hole (14) is located and the two are slidably connected. A compression spring three (27) is also provided in the slide groove (26). The other side of the movable plate (24) is pressed against the side wall where the first through hole (14) is located under the elastic force of the compression spring three (27).

8. The device for establishing an extraperitoneal surgical channel according to claim 1, characterized in that: The material of the tube (7) is silica gel, and the length of the tube (7) is 9 cm to 11 cm.

9. The device for establishing an extraperitoneal surgical channel according to any one of claims 1 to 8, characterized in that: An expansion ring (28) is provided on the outside of the first nozzle (4) and the outside of the second nozzle (5). The expansion ring (28) is fixedly bonded to the outer surface of the three-way valve (3). An annular cavity (29) is provided inside the expansion ring (28). A fixed block (30) is fixedly connected to the three-way valve (3). A fixed block cavity (31) is provided inside the fixed block (30). The fixed block cavity (31) and the annular cavity (29) are connected via a connecting pipe (32). A piston (33) is provided inside the fixed block cavity (31). The piston (33) and the fixed block cavity (31) are sealed and slidably connected. An expansion medium (34) is also provided inside the fixed block cavity (31). The expansion medium (34) and the connecting pipe (32) are both located on the same side of the piston (33). A piston control mechanism connected to the piston (33) is provided on the fixed block (30).

10. The device for establishing an extraperitoneal surgical channel according to claim 9, characterized in that: A screw hole (35) is provided on the end wall of the fixed block cavity (31), and the screw hole (35) is placed on the other side of the piston (33). The piston control mechanism includes a threaded column (36), and the threaded column (36) and the screw hole (35) are threadedly connected. One end of the threaded column (36) is placed on the inner side of the fixed block cavity (31) and a rotating block (37) is fixed thereon. The piston (33) is provided with a rotating groove (38) matching the rotating block (37), and the rotating block (37) is installed in the rotating groove (38) and is rotatably connected thereto. The cross-section of the piston (33) is polygonal. The other end of the threaded column (36) is placed outside the fixed block (30) and a knob (39) is fixed thereon.

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