A device for replacing a drainage tube with a double cannula after surgery

Abstract

The application relates to a device suitable for replacing a double cannula with a drainage tube after an operation, which comprises a drainage tube, a double cannula, a guide wire and an auxiliary positioning mechanism, the drainage tube comprises a drainage tube body and an equal-length second arc-shaped section, the two sides of the second arc-shaped section are buckled on the outer wall of the drainage tube body, a drainage cavity is arranged in the drainage tube body, and a guide cavity for the guide wire is formed between the outer wall of the drainage tube body and the second arc-shaped section; a spiral positioning part is arranged at the head end of the guide wire, the positioning part is limited to be linear after being inserted into the guide cavity, and the positioning part automatically restores to be spiral after being separated from the guide cavity; the auxiliary positioning mechanism comprises a bottom plate, a through clamping hole is vertically arranged in the middle of the bottom plate, a clamping ring is clamped in the clamping hole and can rotate relative to the clamping hole, two supports are symmetrically arranged at the top of the clamping ring, a swing rod is hinged to each support, a mounting seat is fixedly arranged at the upper end of each swing rod, two roller wheels are rotatably arranged between the two mounting seats, and one of the two roller wheels is connected with a rotation circle counting device.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a device suitable for replacing drainage tubes with double-tube after surgery. Background Technology

[0002] Following abdominal surgery, especially gastrointestinal surgery, intra-abdominal infection can sometimes occur in the surgical area, leading to abdominal abscesses or anastomotic leakage. This causes digestive fluids to accumulate in the abdominal cavity, resulting in systemic infection, sepsis, and septic shock, which can even be life-threatening. Actively controlling the source of infection and promptly draining the abdominal abscess or accumulated digestive fluids is crucial for treatment. Drainage tubes are placed during abdominal surgery to drain residual fluid or blood from the surgical area post-surgery. They are typically made of rubber, with one end placed in the surgical area and the other end leading out through the abdominal wall. Because the abdominal cavity is a closed space, even if the end of the drainage tube is in the correct surgical area, pus or infected material cannot be drained immediately. Fluid can only be drained when the intra-abdominal pressure reaches a certain level and the amount of fluid reaches a certain volume. Furthermore, the fluid cannot be completely drained, leaving residue.

[0003] A double-lumen cannula (also known as a self-made Kiehl's tube or a double-lumen negative pressure suction tube) is a clinical device for continuous flushing and negative pressure drainage in the treatment of enterocutaneous fistulas. Postoperatively, to improve the efficiency of pus drainage, the drainage tube can be replaced with a double-lumen cannula. The general procedure is as follows: first, compare the insertion depth of the drainage tube with the double-lumen cannula; then, withdraw the drainage tube; finally, insert the double-lumen cannula into the abdominal cavity to the same depth as the drainage tube. The problem is that although the double-lumen cannula and the drainage tube are inserted to the same depth, it is impossible to determine whether the double-lumen cannula has reached the infected area along the lowering trajectory of the drainage tube. Therefore, it cannot effectively drain pus from the infected area, affecting the patient's recovery. If the source of infection is not removed immediately, it can enter the bloodstream and cause bacteremia and sepsis, leading to septic shock in severe cases and even endangering the patient's life. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for guiding the double-tube drainage tube to reach the infected area along the drainage tube trajectory during the process of replacing the double-tube drainage tube.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A device suitable for postoperative double-tube drainage tube replacement includes a drainage tube, a double tube, a guide wire, and an auxiliary positioning mechanism. The drainage tube includes a drainage tube body and a second arc-shaped segment of equal length. The two sides of the second arc-shaped segment are fastened to the outer wall of the drainage tube body. The drainage tube body has a drainage cavity, and a guide cavity for the guide wire is formed between the outer wall of the drainage tube body and the second arc-shaped segment.

[0007] The guide wire tip is provided with a spiral positioning part. After the positioning part is inserted into the guide cavity, it is constrained to a straight line. After the positioning part is removed from the guide cavity, it automatically returns to a spiral shape.

[0008] The auxiliary positioning mechanism includes a base plate with a through hole vertically opened in the center of the base plate. A retaining ring is rotatably engaged in the retaining hole. Two supports are centrally symmetrically arranged on the top of the retaining ring. A swing rod is hinged to each support. A mounting seat is fixed at the upper end of each swing rod. Two rollers are rotatably arranged between the two mounting seats. The gap between the two rollers is smaller than the diameter of the drainage tube. One of the rollers is connected to a rotating counting device.

[0009] A mounting plate is fixed at the top center of each of the two mounting bases. The length direction of the mounting plate is perpendicular to the top surface of the mounting base. The two mounting plates are arranged symmetrically. A roller assembly for dragging the guide wire is provided between the two mounting plates. The roller assembly is connected to a servo motor. The lower and upper parts of each mounting plate are respectively provided with a lower fixing block and an upper fixing block for fixing the roller assembly.

[0010] In one embodiment of the present invention, the roller assembly includes two symmetrically arranged mounting blocks and two rollers arranged parallel between the two mounting blocks. The two rollers are pressed together. The sides of the two mounting blocks that are far apart from each other are slidably connected to the mounting plates on the corresponding sides. Each mounting plate has a groove on its inner side along the length of the mounting plate. Each mounting block has a slider on its side wall that is slidably connected to the mounting plate, which is adapted to the groove.

[0011] In one embodiment of the present invention, the two rollers are a first roller and a second roller. The first roller is rotatably mounted on two mounting blocks via a first roller shaft, and the second roller is rotatably mounted on two second guide blocks via a second roller shaft. Each of the two mounting blocks has a second guide groove adapted to the second guide block along the arrangement direction of the two rollers on the side closest to each other. The second guide block is slidably connected in the second guide groove. A spring is provided between the side wall of the second guide groove and the second guide block. The spring force direction is the same as the arrangement direction of the two rollers, so that the second roller is always pressed against the first roller.

[0012] In one embodiment of the present invention, a clearance groove corresponding to the first roller shaft is formed along the length direction of the mounting plate. The clearance groove extends along the thickness direction of the mounting plate. One end of the first roller shaft passes through the mounting block and the clearance groove and is connected to the output shaft of the servo motor. A limit frame is fixedly provided on the servo motor on the side near the mounting plate. The limit frame is slidably connected in the clearance groove to prevent the servo motor from rotating when the first roller shaft rotates.

[0013] In one embodiment of the present invention, the upper fixing block and the lower fixing block are both fixed on one side of the two mounting plates that are close to each other. The distance between the upper fixing block and the lower fixing block is greater than the length of the double sleeve. The upper fixing block or the lower fixing block fixes the roller assembly by magnetic attraction. The mounting block is made of iron.

[0014] In one embodiment of the present invention, the roller is a V-shaped guide roller, and a rotating shaft is fixedly provided on each of the two rollers. One roller is rotatably mounted between the same end of the two mounting seats via the rotating shaft, and the other roller is rotatably mounted between the two first guide blocks via the rotating shaft. The two first guide blocks are slidably connected to the other end of the two mounting seats respectively. Each mounting seat has a first guide groove adapted to the first guide block on its side wall. The length direction of the first guide groove is the same as the arrangement direction of the two rollers. Each mounting seat has a threaded hole vertically opened on its top, which communicates with the first guide groove. A tightening bolt for locking the first guide block is threaded into the threaded hole.

[0015] In one embodiment of the present invention, the rollers and the roller cylinder are provided with a silicone layer to prevent the drainage tube and the guide wire from slipping during the dragging process, and the bottom of the base plate is provided with a silicone layer or the entire base plate is a silicone plate.

[0016] In one embodiment of the present invention, the servo motor and the rotation counting device are electrically connected to the control unit. During the process of pulling the drainage tube out of the guide wire, the guide wire is controlled to move in the opposite direction by the roller assembly, so that the head end of the guide wire forms a spiral shape without changing its position. During the process of inserting the double sleeve into the guide wire, the guide wire is controlled to move in the opposite direction by the roller assembly, so that the spiral shape of the head end of the guide wire gradually disappears as the head end of the double sleeve reaches the infected area.

[0017] In one embodiment of the present invention, the positioning part of the guidewire is tapered and spiral-shaped, with the largest spiral radius at the end.

[0018] In one embodiment of the present invention, the drainage tube body includes a first arc-shaped section and a straight section fixed together. The straight section has slots on both sides, and the second arc-shaped section has inserts on both sides corresponding to the slots. The drainage tube is generally cylindrical. The double tube includes a first negative pressure suction tube and a first flushing tube disposed inside the first negative pressure suction tube. The end of the first flushing tube passes through the side wall near the end of the first negative pressure suction tube and is connected to the flushing connector. The end of the first negative pressure suction tube is connected to the negative pressure connector.

[0019] The beneficial effects of adopting the above technical solution are as follows:

[0020] This invention provides a device for replacing postoperative double-tube drainage tubes. A guidewire is inserted into the drainage tube. After the drainage tube is pulled out from the guidewire using an auxiliary positioning mechanism, the guidewire tip, with its spiral positioning portion, is in a free spiral state and supported in the infected area, achieving precise positioning. Then, a double-tube is inserted using the auxiliary positioning mechanism, allowing the tips of the double-tube to reach the infected area along the guidewire, while the spiral shape of the guidewire tip's positioning portion gradually disappears. Finally, the guidewire is withdrawn, accurately completing the replacement of the double-tube. The precise positioning of the double-tube tips enables effective drainage of pus from the infected area, facilitating rapid patient recovery.

[0021] The auxiliary positioning mechanism, equipped with locking holes, locking rings, and brackets, allows for the rotation and angular swing of the mounting base and mounting plate. This facilitates adjustment of the drainage tube's extraction direction and the double-sleeve insertion direction when the drainage tube is inserted at an angle into the abdominal wall. The distance between the two rollers is adjustable, accommodating drainage tubes of different diameters and double-sleeve tubes. The two rollers in the roller assembly can be separated and pressed together, facilitating the removal and insertion of the guide wire between the two rollers. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A1 in the middle.

[0025] Figure 4 This is a schematic diagram of the structure of the present invention from another angle.

[0026] Figure 5 yes Figure 4 A magnified view of a portion of point B in the middle.

[0027] Figure 6 This is another schematic diagram of the structure of the present invention.

[0028] Figure 7 yes Figure 6 A magnified view of a portion of point C in the middle.

[0029] Figure 8 This is another schematic diagram of the structure of the present invention.

[0030] Figure 9 yes Figure 8 A magnified view of a portion of point D in the middle.

[0031] Figure 10 yes Figure 9 A magnified view of a portion of point D1.

[0032] Figure 11 This is a schematic diagram of the guidewire structure in this invention.

[0033] Figure 12 This is a schematic diagram of the double-sleeve structure in this invention.

[0034] Figure 13 This is another structural schematic diagram of the double sleeve in this invention.

[0035] Figure 14 This is a schematic diagram of the structure of the present invention after the drainage tube is removed and before the double sleeve is inserted.

[0036] The components include: 1. Base plate, 2. Snap hole, 3. Snap ring, 4. Bracket, 5. Swing rod, 6. Mounting base, 7. First guide groove, 8. Threaded hole, 9. First guide block, 10. Rotating shaft, 11. Roller, 12. Tightening bolt, 13. Rotation counting device, 14. Mounting plate, 15. Slide groove, 16. Clearance groove, 17. Lower fixing block, 18. Upper fixing block, 19. Mounting block, 20. Slider, 21. First roller, 22. First roller shaft, 23. Servo motor, 24. Limit frame, 25. Second roller, 26. Second roller shaft, 27. Second... 28 Guide block, 29 Second guide groove, 30 Spring, 30 Drainage tube, 3001 First arc-shaped section, 3002 Straight section, 3003 Second arc-shaped section, 31 Slot, 32 Insert block, 33 Guide wire, 34 Positioning part, 35 First negative pressure suction tube, 3501 First negative pressure suction hole, 36 First flushing tube, 37 Negative pressure connector, 38 Flushing connector, 39 Second negative pressure suction tube, 3901 Second negative pressure suction hole, 40 Exhaust pipe, 41 Second flushing pipe, 4101 Opening, 42 Rope. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the invention will be described clearly and completely below in conjunction with specific embodiments.

[0038] like Figures 1-3 and Figure 11The device shown is suitable for postoperative double-tube drainage tube replacement. It includes a drainage tube 30, a double tube, a guide wire 33, and an auxiliary positioning mechanism. The drainage tube 30 includes a drainage tube body and a second arc-shaped segment 3003 of equal length. The two sides of the second arc-shaped segment 3003 are fastened to the drainage tube body. The drainage tube body has a drainage cavity. A guide cavity for the guide wire 33 is formed between the side wall of the drainage tube body and the second arc-shaped segment 3003.

[0039] The guide wire 33 has a spiral positioning part 34 at its tip. The rigidity of the guide wire 33 is smaller than that of the guide cavity. After the positioning part 34 is inserted into the guide cavity, it is restricted to the guide cavity. The overall direction is consistent with the guide cavity and it is restricted to a twisted, approximately straight line. The positioning part 34 is made of shape memory alloy and automatically returns to a spiral shape after being removed from the guide cavity.

[0040] The auxiliary positioning mechanism includes a base plate 1. A through hole 2 is vertically opened in the middle of the base plate 1. A retaining ring 3 is rotatably engaged in the retaining hole 2. Two supports 4 are centrally symmetrical about the axis of the retaining ring 3 at the top of the retaining ring 3. A swing rod 5 is hinged to the support 4. A mounting seat 6 is fixed at the upper end of the swing rod 5. Two rollers 11 are rotatably arranged between the two mounting seats 6. The gap between the two rollers 11 is smaller than the diameter of the drainage pipe 30. One of the rollers 11 is connected to a rotation counting device 13. The rotation counting device 13 counts the number of rotations of the roller 11. The rotation counting device 13 is a common rotary encoder or counter on the market. It is connected to the rotating shaft of the roller 11 and is used to record the number of rotations of the rotating shaft of the roller 11. This is a conventional technical means in this field and will not be described in detail here.

[0041] Two mounting bases 6 are each vertically fixed at the top center of a mounting plate 14. The two mounting plates 14 are centrally symmetrical about the axis of the retaining ring 3. A roller assembly for dragging the guide wire 33 is provided between the two mounting plates 14. The roller assembly is connected to the servo motor 23 and the dragging speed and dragging distance of the guide wire 33 are controllable. The lower part and the upper part of the mounting plate 14 are respectively provided with a lower fixing block and an upper fixing block for fixing the roller assembly.

[0042] The present invention provides a device for replacing postoperative double-tube drainage tubes. A guidewire 33 is inserted into the drainage tube 30. After the drainage tube 30 is pulled out from the guidewire 33 by an auxiliary positioning mechanism, the tip of the guidewire 33 is in a free spiral shape supported in the infected area by a spiral positioning part 34, achieving precise positioning. Then, a double tube is inserted through the auxiliary positioning mechanism, allowing the tips of the double tubes to reach the infected area along the guidewire 33, while the spiral shape of the positioning part 34 at the tip of the guidewire 33 gradually disappears. Finally, the guidewire 33 is withdrawn, accurately completing the replacement of the double tubes. The precise positioning of the double tube tips effectively drains pus from the infected area, facilitating rapid patient recovery.

[0043] The auxiliary positioning mechanism, with its locking holes 2, locking rings 3, and brackets 4, allows for the rotation and angular swinging of the mounting base 6 and mounting plate 14. This facilitates adjustment of the extraction direction of the drainage tube 30 and the insertion direction of the double-sleeve tube when the tube is inserted at an angle into the abdominal wall. The distance between the two rollers 11 is adjustable, accommodating drainage tubes 30 and double-sleeve tubes of different diameters. The two rollers in the roller assembly can be separated and pressed together, facilitating the removal and insertion of the guide wire 33 between the two rollers.

[0044] like Figures 4-7 As shown, the roller assembly includes two symmetrically arranged mounting blocks 19 and two rollers arranged parallel between the two mounting blocks 19. The two rollers are pressed together. The sides of the mounting blocks 19 that are far apart from each other are slidably connected to the corresponding mounting plates 14. The inner side of the mounting plate 14 is provided with a groove 15 along the length direction of the mounting plate 14. The mounting blocks 19 are provided with sliders 20 that are adapted to the grooves 15, so that the roller assembly can only move along the length direction of the mounting plate 14.

[0045] like Figures 8-10 As shown, the two rollers are a first roller 21 and a second roller 25. The first roller 21 is rotatably mounted on two mounting blocks 19 via a first roller shaft 22, and the second roller 25 is rotatably mounted on a second guide block 27 via a second roller shaft 26. Each of the two mounting blocks 19 has a second guide groove 28 adapted to the second guide block 27 along the arrangement direction of the two rollers on its adjacent side. The second guide block 27 is slidably connected within the second guide groove 28. A spring 29 is provided between the side wall of the second guide groove 28 and the second guide block 27, ensuring that the second roller 25 is always pressed against the first roller 21. In this embodiment, the spring 29 is a tension spring, with its two ends fixed to the inner walls of the second guide block 27 and the second guide groove 28 on the side closest to the first roller 21, respectively.

[0046] One of the mounting plates 14 has a relief groove 16 corresponding to the first roller shaft 22 along its length direction. The relief groove 16 extends through the thickness direction of the mounting plate 14. One end of the first roller shaft 22 passes through the relief groove 16 and is connected to the output shaft of the servo motor 23. A limiting frame is fixed on the housing of the servo motor 23. The limiting frame is slidably connected in the relief groove 16 and can only move along the length direction of the relief groove 16 to prevent the servo motor 23 from rotating when the first roller shaft 22 rotates.

[0047] The upper fixing block 18 and the lower fixing block 17 are both fixed on one side of the two mounting plates 14, close to each other. The distance between the upper fixing block 18 and the lower fixing block 17 is greater than the length of the double sleeve. The upper fixing block 18 or the lower fixing block 17 fixes the roller assembly by magnetic attraction. The mounting block 19 is made of iron. The upper fixing block 18 and the lower fixing block 17 are magnets or have electromagnets inside.

[0048] Roller 11 is a V-shaped guide wheel. A rotating shaft 10 is fixedly mounted on each of the two rollers 11. One roller 11 is rotatably mounted between the same end of the two mounting seats 6 via the rotating shaft 10. A first guide groove 7 is formed on the side wall of the other end of each of the two mounting seats 6. The length direction of the first guide groove 7 is the same as the arrangement direction of the two rollers 11. The other roller 11 is rotatably mounted on two first guide blocks 9 via the rotating shaft 10. The two first guide blocks 9 are slidably connected to the corresponding first guide grooves 7. A threaded hole 8 communicating with the first guide groove 7 is vertically formed at the top center of each mounting seat 6. A tightening bolt 12 for locking the first guide block 9 is threaded into the threaded hole 8. By setting the first guide groove 7, the first guide block 9, and the tightening bolt 12, the distance between the two rollers 11 can be adjusted, suitable for drainage pipes 30 and double sleeves of different diameters.

[0049] Both roller 11 and roller surface are provided with silicone layer to prevent drainage tube 30 and guide wire 33 from slipping during dragging. The bottom of base plate 1 is provided with silicone layer or the entire base plate 1 is a silicone plate with certain strength that can fit on the abdominal surface.

[0050] As a further optimization, the positioning part 34 of the guidewire 33 is tapered and spiral-shaped, with the largest spiral radius at the end, so that the positioning part 34 can better support the infected area inside the abdominal cavity.

[0051] The drainage tube body includes a first arc-shaped section 3001 and a straight section 3002 fixed together. Slots 31 are provided on both sides of the straight section 3002, and insertion blocks 32 corresponding to the slots 31 are provided on both sides of the second arc-shaped section 3002. The drainage tube 30 is generally cylindrical. The auxiliary positioning mechanism can be applied to different types of double-tube systems, such as... Figure 12 As shown, in one embodiment, the double-tube system includes a first negative pressure suction tube 35 and a first flushing tube 36 disposed inside the first negative pressure suction tube 35. The end of the first flushing tube 36 extends from the side wall near the end of the first negative pressure suction tube 35 and is connected to a flushing connector 38. The end of the first negative pressure suction tube 35 is connected to a negative pressure connector 37. Multiple first negative pressure suction holes 3501 are formed on the side wall of the head end of the first negative pressure suction tube 35. For example... Figure 13As shown, in another embodiment, the double-tube system includes a second negative pressure suction tube 39 and a second flushing tube 41. The second negative pressure suction tube 39 has evenly spaced second negative pressure suction holes 3901 on its sidewall. The head end of the second negative pressure suction tube 39 is fastened to the head end of the second flushing tube 41 by a rope 42. The head end of the second flushing tube 41 has an opening 4101. The rope 42 passes through the second negative pressure suction holes 3901 and wraps around the opening 4101 to secure the second flushing tube 41 to the second negative pressure suction tube 39. During use, the ends of the second negative pressure suction tube 39 and the second flushing tube 41 are always located outside the abdominal cavity. The end of the second flushing tube 41 is connected to a flushing device. A suction tube 40 is inserted into the second negative pressure suction tube 39 from its end, and the suction tube 40 is connected to a suction device. The second negative pressure suction tube 39 and the second flushing tube 41 are made of relatively rigid materials. When the exhaust tube 40 draws air into the second negative pressure suction tube 39, the second negative pressure suction tube 39 will not collapse as the negative pressure in the abdominal cavity increases. This allows external air to enter the second negative pressure suction tube 39 through the gap between it and the exhaust tube 40, and then be discharged through the exhaust tube 40, preventing excessive negative pressure in the abdominal cavity. The second flushing tube 41 has a smaller diameter than the second negative pressure suction tube 39. When the double tubes move between the rollers 11, the two rollers 11 compress the second negative pressure suction tube 39. The second flushing tube 41 is located on one side and does not affect the movement of the second negative pressure suction tube 39 between the rollers 11. When inserting the double tubes into the abdominal cavity, the guide wire 33 passes through either the first negative pressure suction tube 35 or the second negative pressure suction tube 39.

[0052] Both the mounting base 6 and the mounting plate 14 are arc-shaped with the arc facing outwards. A damping element is provided between the bracket 4 and the swing rod 5, so that after the swing rod 5 swings relative to the bracket 4 at a certain angle, it can remain stationary under the action of damping. The inner wall of the locking hole 2 is provided with an annular groove, and the outer wall of the locking ring 3 is provided with an annular protrusion that matches the annular groove. The annular protrusion is locked in the annular groove.

[0053] In this embodiment, the servo motor 23 and the rotation counting device 13 are electrically connected to the control unit. During the process of pulling the drainage tube 30 out of the guide wire 33, the guide wire 33 is controlled to move in the opposite direction (i.e., the direction of movement is opposite to the direction of movement of the drainage tube 30) by the roller assembly, so that the head end of the guide wire 33 forms a spiral shape without changing its position. During the process of inserting the double tube along the guide wire 33 into the abdominal cavity, the guide wire 33 is controlled to move in the opposite direction (i.e., the direction of movement is opposite to the direction of movement of the double tube) by the roller assembly, so that the spiral shape of the head end of the guide wire 33 gradually disappears as the head end of the double tube reaches the infected area.

[0054] Guide wire 33 is inserted into the guiding cavity before drainage tube 30 is inserted into the abdominal cavity. It is inserted into the abdominal cavity together with drainage tube 30, or the drainage tube 30 is inserted into the abdominal cavity first, and the guide wire 33 is inserted into the guiding cavity when it is necessary to replace the drainage tube 30 with a double-tube. The guide wire 33 is marked. When the guide wire 33 is inserted into the guiding cavity of drainage tube 30, the guide wire 33 is aligned with the tip of drainage tube 30 (the end that extends into the patient's body), and the mark is aligned with the end (top) of drainage tube 30. At this point, the insertion of guide wire 33 into the guiding cavity is stopped. The mark serves as an indicator.

[0055] In one implementation, the drainage tube 30 and the double sleeve are marked with graduations, with the bottom marked zero. The insertion length of the double sleeve is equal to the withdrawal length of the drainage tube 30, and the withdrawal length of the drainage tube 30 can be referenced by the graduation reading of the drainage tube 30 at the roller 11. In another implementation, the drainage tube 30 and the double sleeve are not marked with graduations. The insertion length of the double sleeve and the withdrawal length of the drainage tube 30 are measured by the rotation counting device 13 and the control unit, ensuring that the number of rotations of the roller 11 when the double sleeve is inserted is equal to the number of rotations when the drainage tube 30 is withdrawn. Furthermore, when the number of rotations of the roller 11 when the double sleeve is inserted is equal to the number of rotations when the drainage tube 30 is withdrawn, the control unit activates an indicator light or alarm to issue a warning.

[0056] Working principle:

[0057] The length of the drainage tube 30 pulled out is L. The data storage module in the control unit stores the dragging distance L1 of the drainage tube 30 corresponding to the number of rotations N of the roller 11, and the dragging distance L2 of the double sleeve corresponding to the number of rotations N of the roller 11. The total length of the positioning part 34 in the free state is M. The data storage module stores the distance D1 of each point on the positioning part 34 in the free state from its head end (the end with the largest spiral radius) and the distance D2 of the corresponding point from its head end after the guide wire 33 is straightened. The data storage module stores the distance D3 of each point on the positioning part 34 in the free state from the end of the positioning part 34 (the connection between the straight part of the positioning part 34 and the guide wire 33) and the distance D4 of the corresponding point from the end of the positioning part 34 after the guide wire 33 is straightened.

[0058] During the withdrawal of the drainage tube 30 from the guidewire 33, when the withdrawal length is L1, the control unit controls the guidewire 33 to move synchronously in the opposite direction to the length D2 corresponding to L1, until L1 = M, at which point the guidewire 33 stops moving. At this time, the tip of the guidewire 33 is in a free state and spiral shape in the abdominal cavity, and the remaining length of the drainage tube 30 is LM, which is then completely withdrawn. When inserting the double-walled cannula, the double-walled cannula moves along the guidewire 33 to the tip of the guidewire 33. During the process where the double-walled cannula insertion length L2 is less than LM, the guidewire... 33 remains stationary. When the remaining insertion distance of the double cannula is less than M, the control unit controls the guidewire 33 to move synchronously in the opposite direction to the length D4 corresponding to D3 = L2 - (LM). As the tip of the double cannula (the end that extends into the patient's body) reaches the abdominal infection area along the guidewire 33, the spiral shape of the tip of the guidewire 33 gradually disappears until the insertion length of the double cannula is L. The guidewire 33 is then pulled out of the double cannula. At this time, the tip of the double cannula is exactly at the position where the tip of the drainage tube 30 was before it was pulled out.

[0059] Specific usage process:

[0060] Initially, the tip of the drainage tube 30 is located in the infected area within the abdominal cavity, and the guide wire 33 is located in the guiding cavity of the drainage tube 30. The tip of the guide wire 33 is flush with the tip of the drainage tube 30 (the end that extends into the patient's body). At this time, the positioning part 34 of the guide wire 33 is in a straight state under the limitation of the guiding cavity. The guide wire 33 is marked, and at this time the mark is just flush with the end (upper end) of the drainage tube 30.

[0061] When the drainage tube 30 needs to be replaced with a double tube, fix the roller assembly at the lower fixing block 17, place the base plate 1 on the patient's abdomen, and let the end of the drainage tube 30 pass through the retaining ring 3 from bottom to top and be squeezed between the two rollers 11. Place the guide wire 33 in the guide cavity between the two rollers of the roller assembly, manually let the drainage tube 30 pass through the two rollers 11 from bottom to top, and at the same time, the rotation counting device 13 counts, and the servo motor 23 controls the guide wire 33 to move in the opposite direction to the drainage tube 30 according to the set program. After the drainage tube 30 passes through the two rollers 11, the second arc-shaped segment 3003 and the upper end of the drainage tube body are manually separated into two parts and then pulled out from both sides of the roller assembly. As the second arc-shaped segment 3003 and the drainage tube body are pulled upward on both sides of the roller assembly, the drainage tube 30 is gradually divided into two parts and pulled out between the two rollers 11. This allows the roller assembly to push the guide wire 33 in the reverse direction (push it into the abdominal cavity) with a small and constant distance from the drainage tube 30, preventing the guide wire 33 from bending due to insufficient toughness caused by an excessively large distance between the roller assembly and the drainage tube 30, which would prevent the guide wire 33 from moving smoothly along the guide cavity.

[0062] After the drainage tube 30 is pulled out, the guide wire 33 in the roller assembly is removed, as shown in the following figure. Figure 14Separate the roller assembly from the lower fixing block 17 and then fix it at the upper fixing block 18. After inserting the double sleeve from the end of the guide wire 33, clamp the guide wire 33 back between the two rollers so that the double sleeve is located between the roller assembly and the roller 11 and the guide wire 33 between the roller assembly and the roller 11 is taut. Manually move the lower end of the double sleeve between the two rollers 11 and downward. At the same time, the rotation counting device 13 counts. The servo motor 23 controls the guide wire 33 to move in the opposite direction to the double sleeve according to the set program.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device suitable for changing drainage tubes with double cannulas after surgery, characterized in that: It includes a drainage tube, a double-walled tube, a guide wire, and an auxiliary positioning mechanism. The drainage tube includes a drainage tube body and a second arc-shaped section of equal length. The two sides of the second arc-shaped section are fastened to the outer wall of the drainage tube body. The drainage tube body has a drainage cavity. A guide cavity for the guide wire is formed between the outer wall of the drainage tube body and the second arc-shaped section. The guide wire tip is provided with a spiral positioning part. After the positioning part is inserted into the guide cavity, it is constrained to a straight line. After the positioning part is removed from the guide cavity, it automatically returns to a spiral shape. The auxiliary positioning mechanism includes a base plate with a through hole vertically opened in the center of the base plate. A retaining ring is rotatably engaged in the retaining hole. Two supports are centrally symmetrically arranged on the top of the retaining ring. A swing rod is hinged to each support. A mounting seat is fixed at the upper end of each swing rod. Two rollers are rotatably arranged between the two mounting seats. The gap between the two rollers is smaller than the diameter of the drainage tube. One of the rollers is connected to a rotating counting device. A mounting plate is fixed at the top center of each of the two mounting bases. The length direction of the mounting plate is perpendicular to the top surface of the mounting base. The two mounting plates are arranged symmetrically. A roller assembly for dragging the guide wire is provided between the two mounting plates. The roller assembly is connected to a servo motor. The lower and upper parts of each mounting plate are respectively provided with a lower fixing block and an upper fixing block for fixing the roller assembly.

2. The device for changing drainage tubes with double cannulas after surgery according to claim 1, characterized in that: The roller assembly includes two symmetrically arranged mounting blocks and two rollers arranged parallel between the two mounting blocks. The two rollers are pressed together. The sides of the two mounting blocks that are far apart from each other are slidably connected to the mounting plates on the corresponding sides. Each mounting plate has a groove on its inner side along its length. Each mounting block has a slider on its side wall that is slidably connected to the mounting plate, which is adapted to the groove.

3. The device for changing drainage tubes with double cannulas after surgery according to claim 2, characterized in that: The two rollers are a first roller and a second roller. The first roller is rotatably mounted on two mounting blocks via a first roller shaft, and the second roller is rotatably mounted on two second guide blocks via a second roller shaft. Each of the two mounting blocks has a second guide groove adapted to the second guide block along the arrangement direction of the two rollers on the side closest to each other. The second guide block is slidably connected in the second guide groove. A spring is provided between the side wall of the second guide groove and the second guide block. The spring force direction is the same as the arrangement direction of the two rollers, so that the second roller is always pressed against the first roller.

4. The device for changing a double-tube drainage tube after surgery according to claim 3, characterized in that: One of the mounting plates has a clearance groove along its length that corresponds to the first roller shaft. The clearance groove extends along the thickness direction of the mounting plate. One end of the first roller shaft passes through the mounting block and the clearance groove and is connected to the output shaft of the servo motor. A limit frame is fixedly provided on the servo motor on the side near the mounting plate. The limit frame is slidably connected in the clearance groove to prevent the servo motor from rotating when the first roller shaft rotates.

5. The device for changing a double-tube drainage tube after surgery according to claim 4, characterized in that: The upper and lower fixing blocks are both fixed on one side of the two mounting plates that are close to each other. The distance between the upper and lower fixing blocks is greater than the length of the double sleeve. The upper or lower fixing block fixes the roller assembly by magnetic attraction. The mounting block is made of iron.

6. A device for changing a double-tube drainage tube after surgery, as described in any one of claims 1-5, characterized in that: The rollers are V-shaped guide rollers, and each roller is fixedly equipped with a rotating shaft. One roller is rotatably mounted between the same end of the two mounting seats via the rotating shaft, and the other roller is rotatably mounted between the two first guide blocks via the rotating shaft. The two first guide blocks are slidably connected to the other end of the two mounting seats. Each mounting seat has a first guide groove on its side wall that matches the first guide block. The length direction of the first guide groove is the same as the arrangement direction of the two rollers. Each mounting seat has a threaded hole vertically opened at its top that communicates with the first guide groove. Each threaded hole is threaded with a tightening bolt for locking the first guide block.

7. The device for changing a double-tube drainage tube after surgery according to claim 6, characterized in that: Both the roller and the drum surface are provided with a silicone layer to prevent the drainage tube and guide wire from slipping during dragging. The bottom of the base plate is provided with a silicone layer or the entire base plate is a silicone plate.

8. The device for changing a double-tube drainage tube after surgery according to claim 6, characterized in that: The servo motor and the rotation counting device are electrically connected to the control unit. During the process of pulling the drainage tube out of the guide wire, the guide wire is controlled to move in the opposite direction by the roller assembly, so that the head end of the guide wire forms a spiral shape without changing its position. During the process of putting the double sleeve into the guide wire, the guide wire is controlled to move in the opposite direction by the roller assembly, so that the spiral shape of the head end of the guide wire gradually disappears as the head end of the double sleeve reaches the infected area.

9. The device for changing a double-tube drainage tube after surgery according to claim 8, characterized in that: The positioning part of the guidewire is tapered and spiral-shaped, with the largest spiral radius at the end.

10. The device for changing a double-tube drainage tube after surgery according to claim 1, characterized in that: The drainage tube body includes a first arc-shaped section and a straight section fixed together. The straight section has slots on both sides, and the second arc-shaped section has inserts on both sides corresponding to the slots. The drainage tube is generally cylindrical. The double tube includes a first negative pressure suction tube and a first flushing tube disposed inside the first negative pressure suction tube. The end of the first flushing tube passes through the side wall near the end of the first negative pressure suction tube and is connected to the flushing connector. The end of the first negative pressure suction tube is connected to the negative pressure connector.

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