A drainage catheter with pressure monitoring

Abstract

The present invention discloses a drainage catheter with pressure monitoring, which relates to the field of medical devices, including a catheter, wherein a first through hole is provided on the tube wall at the front end of the catheter, and a fixed tube is fixedly connected inside the catheter, a second through hole is provided at the position of the fixed tube corresponding to the first through hole, a sliding tube is also included, the sliding tube is slidably connected to the fixed tube, and a third through hole corresponding to the first through hole is provided on the side wall, and a sliding plate is also included, the sliding plate is used to press the liquid in the fixed tube out of the catheter. The present invention uses a pull rope to pull the sliding tube to clear the through hole on the catheter, and at the same time, when the sliding plate connected to the sliding tube moves, the through hole of the catheter is backflushed by the reverse flow of liquid, and the through hole at the front end of the catheter can be cleared by intermittently pulling the pull rope, effectively avoiding the through hole at the front end of the catheter from being blocked, so that the operation can be carried out smoothly.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, in particular to a drainage catheter with pressure monitoring. Background Art

[0002] Drainage catheters with pressure monitoring function are important tools in modern surgical operations. By real-time monitoring of pressure changes in body cavities or tubes, they help doctors accurately control the drainage process, prevent complications, and drain fluid, gas or pus accumulated in the body cavity or between tissues to promote wound healing, prevent infection and assist in disease monitoring.

[0003] The relevant announcement is a Chinese patent CN113398428A, which discloses a dynamically monitored drainage catheter, including a drainage catheter body, the head end of the drainage catheter body is connected to an insertion interface, and the tail end is fixedly connected to a liquid receiving tube; the head end and tail end of the drainage catheter body are respectively provided with a head end pressure sensor and a tail end pressure sensor, and the head end pressure sensor and the tail end pressure sensor are both connected to a main control unit, and the main control unit is used to collect the pressure values ​​measured by the head end pressure sensor and the tail end pressure sensor, and calculate the difference between the two to obtain a pressure difference value.

[0004] Regarding the above-mentioned related technologies, multiple through holes are arranged along the circumferential direction at the access socket of the drainage catheter. The liquid to be drained passes through the through holes and enters the liquid receiving tube. However, the actual drainage cavity or the liquid accumulated between tissues may contain various clots. During the drainage process of the drainage catheter, the clots in the liquid can easily clog the through holes, causing the liquid to be drained to flow poorly, affecting the normal progress of the drainage operation.

[0005] Another related Chinese patent with publication number CN114432570A discloses a real-time ultrasound detection drainage catheter, which includes: a drainage tube, which includes an insertion section inserted into the patient's brain and a reserved section reserved outside the patient's brain; a drainage port, which is opened at the head of the insertion section; and an ultrasound detection module, which is inserted into the drainage tube and is used to detect the position of the drainage tube in the patient's brain.

[0006] In response to the above-mentioned related technologies, the existing drainage tube has a delivery tube and a cable with a diameter smaller than the inner diameter of the tube body set in the length direction. When the diameter of the drainage tube itself does not increase, the delivery tube and the cable set in the tube body will occupy part of the delivery space in the tube body. Moreover, since the delivery tube and the cable are not positioned in the tube body, when the delivery tube and the cable are alternately attached to the inner wall or not attached to the inner wall in each section of the space along the length direction in the drainage tube, the delivery tube and the cable set in the drainage tube can easily hinder the smooth flow of the liquid, especially when the liquid contains clots, the clots can easily get blocked at the bends of the delivery tube and the cable, affecting the normal infusion of the drainage tube.

[0007] In summary, existing drainage catheters with pressure monitoring are prone to clogging during use, thereby affecting the normal progress of the operation. Summary of the Invention

[0008] Based on this, an object of the present invention is to provide a drainage catheter with pressure monitoring to solve the technical problem that the existing drainage catheter with pressure monitoring is easily blocked during use.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a drainage catheter with pressure monitoring, comprising a catheter, a first through hole being provided on the tube wall at the front end of the catheter, and a fixed tube being fixedly connected inside the catheter, a second through hole being provided at a position of the fixed tube corresponding to the first through hole, a sliding tube being slidably connected inside the fixed tube, and a third through hole corresponding to the first through hole being provided on the side wall, and a sliding plate being further provided, the sliding plate being used to press the liquid in the fixed tube out of the catheter.

[0010] By adopting the above technical solution, the sliding tube is pulled by a pull rope to clear the through hole on the catheter. At the same time, when the sliding plate connected to the sliding tube moves, the through hole of the catheter is recoiled by the reverse flowing liquid. The through hole at the front end of the catheter can be cleared by intermittently pulling the pull rope, effectively avoiding blockage of the through hole at the front end of the catheter, so that the operation can proceed smoothly.

[0011] The present invention is further configured such that the outer diameter of the sliding tube is equal to the inner diameter of the fixed tube, and the end of the sliding tube does not enter the area where the second through hole is provided in the fixed tube when not sliding. The sliding tube can slide toward the area where the second through hole is provided in the fixed tube, and is limited by a limiting structure when sliding to the third through hole corresponding to the first through hole.

[0012] Preferably, when the sliding tube is pulled, the end portion can pass through each second through hole in sequence, scraping part of the blocked clot into the catheter.

[0013] The present invention is further configured such that the aperture of the first through hole is smaller than that of the second through hole, and the tube wall of the conduit at the first through hole can be concavely deformed toward the second through hole.

[0014] Preferably, under the action of negative pressure in the catheter, the clot blocking the first through hole can be closer to the axial direction of the catheter, and thus can be better scraped off when the sliding tube moves.

[0015] The present invention is further configured such that a spiral support band is provided inside the catheter along the length direction, a spiral fixing band is sleeved on the spiral support band along the length direction of the catheter, the spiral fixing band contacts the inner wall of the catheter, and the end of the spiral support band away from the spiral fixing band also contacts the inner wall of the catheter, the spiral directions of the spiral support band and the spiral fixing band are different, and a wire threading tube passes through the spiral fixing band.

[0016] As a preferred embodiment, the spiral support band can ensure that the catheter is not easily collapsed due to negative pressure, while ensuring the structural strength of the catheter, and also allows the spiral fixing band to be close to the inner wall of the catheter, leaving a large cross-section liquid passage in the catheter.

[0017] The present invention is further configured such that a fixed box is fixedly connected to a position near the front end of the catheter in the fixed tube along its own length direction, a sliding box is slidably sleeved on the outside of the fixed box, one end of the sliding box away from the front end of the catheter is fixedly connected to the sliding tube, the sliding tube is open at one end toward the fixed box, and the other end is closed, the sliding box is fixedly connected to the closed end of the sliding tube, and a first tension spring is provided in the sliding box and the fixed box between the closed end of the sliding tube and the fixed tube.

[0018] Preferably, the sliding tube is reset by a first tension spring.

[0019] The present invention is further configured such that a fixing ring is fixedly connected to the interior of the fixing tube near the front end of the catheter, a magnet for adsorbing the fixing ring is connected to the side of the sliding plate facing the fixing ring, one end of a second tension spring is connected to the other side of the sliding plate, and the other end of the second tension spring is connected to the open end of the sliding tube, and when the third through hole corresponds to the first through hole, the elastic force of the second tension spring is greater than the magnetic force between the magnet on the sliding plate and the fixing ring.

[0020] Preferably, the second tension spring is used to pull the sliding plate to slide toward the sliding tube, pushing the liquid in the fixed tube and the sliding tube to flow out in the opposite direction, so that the clot blocking the first through hole falls off.

[0021] The present invention is further configured such that a scraper is provided at an annular interval at a position of the sliding tube away from the front end of the catheter corresponding to each first through hole, and a needle having a length greater than the scraper is provided in the middle of the scraper.

[0022] Preferably, the scraper and the needle can better push away the clot blocking the first through hole.

[0023] The present invention is further configured such that a camera is provided at one end of the threading tube facing the fixed tube, and a pull rope for pulling the sliding tube passes through the interior along the length direction, and a pull rope through-hole for passing the pull rope is also provided at the end of the threading tube.

[0024] Preferably, the camera can be used to observe the state of the drainage liquid and the blockage at the front end of the catheter.

[0025] The present invention is further configured such that the rear end of the catheter is fixedly connected to a three-way pipe, and the three-way pipe is provided with a liquid passage along the radial direction of the catheter.

[0026] As a preferred embodiment, the threading tube can pass through the tee tube along the length direction of the catheter, while also ensuring that the drainage liquid can smoothly pass through the tee tube and flow out from the liquid outlet.

[0027] The present invention is further configured such that the sliding plate is slidably connected to the fixed box, and its edge contacts the inner wall of the fixed tube, and the front ends of the conduit and the fixed tube are provided with perforations for balancing the pressure in the space at both ends of the sliding plate.

[0028] Preferably, the sliding plate is capable of better promoting the reverse flow of the liquid in the fixed tube and the sliding tube.

[0029] In summary, the present invention mainly has the following beneficial effects:

[0030] The present invention provides a fixed tube at the front end of the catheter, and slides a sliding tube in the fixed tube. The sliding tube is pulled by a drawstring to clear the through hole on the catheter. At the same time, when the sliding plate connected to the sliding tube moves, the through hole of the catheter is recoiled by the reverse-flowing liquid. The through hole at the front end of the catheter can be cleared by intermittently pulling the drawstring, effectively avoiding blockage of the through hole at the front end of the catheter, so that the operation can be carried out smoothly.

[0031] The present invention provides a positioning structure for the threading tube in the catheter, so that the threading tube in the catheter can be close to the inner wall of the catheter, thereby increasing the cross-sectional area of ​​the liquid flow path in the catheter, effectively preventing the threading tube from twisting or bending in the catheter, and further preventing the catheter from being blocked when transporting liquid.

[0032] The present invention thins the tube wall of the catheter and provides a spiral support belt inside the catheter, thereby effectively expanding the catheter's ability to transport liquid without increasing the catheter diameter or reducing the catheter's strength, thereby further improving the drainage catheter's anti-clogging ability.

[0033] The present invention provides a second through hole corresponding to the first through hole at the front end of the catheter on the side wall of the fixed tube, so that the aperture of the second through hole is larger than the first through hole. When a clot is blocked in the first through hole of the flexible material catheter, the position of the catheter corresponding to the second through hole will be pressed toward the axial direction of the catheter due to the negative pressure in the catheter. When the pull rope pulls the sliding tube to move, the clot can be scraped into the interior of the catheter and transported away more easily, further improving the dredging ability of the first through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A perspective view of the present invention;

[0035] Figure 2 A three-dimensional diagram of the internal structure of the front end of the catheter of the present invention;

[0036] Figure 3 For the present invention Figure 2A magnified view of middle A;

[0037] Figure 4 This is a three-dimensional diagram of the structure of the spiral support band and the spiral fixing band in the catheter of the present invention;

[0038] Figure 5 For the present invention Figure 4 Enlarged view of middle B;

[0039] Figure 6 A three-dimensional diagram of the fixed tube structure in the catheter of the present invention;

[0040] Figure 7 For the present invention Figure 6 Enlarged view of middle C;

[0041] Figure 8 This is a perspective view of the sliding tube in the fixed tube of the present invention when it is not pulled by the pull rope;

[0042] Figure 9 For the present invention Figure 8 Enlarged view of middle D;

[0043] Figure 10 This is a perspective view of the present invention in which the sliding tube in the fixed tube is pulled by a pull rope but the sliding plate is not separated from the fixed ring;

[0044] Figure 11 A perspective view of the present invention showing a sliding tube in a fixed tube being pulled by a pull rope, with the sliding plate and the fixed ring separated;

[0045] Figure 12 A perspective view of a sliding tube according to the present invention;

[0046] Figure 13 A three-dimensional diagram of the internal structure of the tee pipe of the present invention;

[0047] Figure 14 For the present invention Figure 13 Enlarged view of E.

[0048] Description of reference numerals:

[0049] 1. Catheter; 101. First through hole; 2. Fixed tube; 201. Second through hole; 202. Stopper; 203. Fixed box; 204. Fixed ring; 3. Sliding tube; 301. Third through hole; 302. Sliding box; 303. Scraper; 304. Needle; 4. Spiral support belt; 5. Spiral fixing belt; 6. Threading tube; 601. Camera; 602. Draw rope hole; 7. Tee; 701. Liquid port; 8. Sliding plate; 9. First tension spring; 10. Second tension spring. DETAILED DESCRIPTION

[0050] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0051] The following describes an embodiment of the present invention based on its overall structure.

[0052] First embodiment:

[0053] A drainage catheter with pressure monitoring, see Figure 1-14 , including a catheter 1, a threading tube 6 is arranged along the length direction of the catheter 1, and a sensor device for monitoring pressure is arranged in the threading tube 6. How to monitor the pressure specifically is not a technical problem that needs to be improved in this application, and will not be described in detail here. A first through hole 101 is provided on the tube wall at the front end of the catheter 1, and a fixed tube 2 is fixedly connected to the inside. A second through hole 201 is provided at the position of the fixed tube 2 corresponding to the first through hole 101. During the normal drainage process, the liquid to be drained will first pass through the first through hole 101 and then pass through the second through hole 201 under the action of the negative pressure in the catheter 1 before entering the catheter 1.

[0054] It also includes a sliding tube 3, which is slidably connected to the fixed tube 2, and a third through hole 301 corresponding to the first through hole 101 is provided on the side wall. The sliding tube 3 can slide under the pull rope located in the catheter 1, and an elastic reset structure is provided between the end of the sliding tube 3 away from the pull rope and the fixed tube 2. The sliding tube 3 and the fixed tube 2 do not rotate relative to each other, ensuring that each time the sliding tube 3 slides, the third through hole 301 and the first through hole 101 can be aligned with each other.

[0055] It also includes a sliding plate 8, which is used to press the liquid in the fixed tube 2 out of the catheter 1. The liquid flowing out of the catheter 1 in the reverse direction can flush out the clot blocking the first through hole 101, preventing it from continuing to block the first through hole 101 and affecting the liquid entering the catheter 1.

[0056] In the above embodiment, please refer to Figure 4-5 A camera 601 is provided at one end of the threading tube 6 facing the fixed tube 2, and a pull rope for pulling the sliding tube 3 passes through the inside along the length direction. Specifically, the pull rope is a medical stainless steel wire. The end of the threading tube 6 is provided with lamp beads for lighting on both sides of the camera 601, so that the camera 601 can clearly observe the state of the drainage liquid and the blockage of the front end of the catheter 1. The end of the threading tube 6 is also provided with a pull rope through hole 602 for the pull rope to pass through.

[0057] In the above embodiment, please refer to Figure 8-11The outer diameter of the sliding tube 3 is equal to the inner diameter of the fixed tube 2. When the sliding tube 3 is not sliding, its end does not enter the area where the second through hole 201 is provided in the fixed tube 2, so as to avoid affecting the normal drainage of the catheter 1. Under the traction of the pull rope, the sliding tube 3 can slide toward the area where the second through hole 201 is provided in the fixed tube 2, and is limited by the limiting structure when sliding to the third through hole 301 corresponding to the first through hole 101.

[0058] Specifically, in this embodiment, the limiting structure is a stopper 202 arranged at an annular interval at the end of the fixed tube 2. When the sliding tube 3 is pulled, the end can pass through each second through hole 201 in turn, scraping part of the blocked clot into the catheter 1.

[0059] In the above embodiment, please refer to Figure 8-12 A fixed box 203 is fixedly connected to the fixed tube 2 near the front end of the catheter 1 along its own length direction, and a sliding box 302 is slidably sleeved on the outside of the fixed box 203. The end of the sliding box 302 away from the front end of the catheter 1 is fixedly connected to the sliding tube 3. Specifically, the cross-sections of the fixed box 203 and the sliding box 302 are both rectangular, which can effectively prevent relative rotation between the sliding tube 3 and the fixed tube 2.

[0060] Furthermore, the sliding tube 3 is open at one end toward the fixed box 203 and closed at the other end. The sliding box 302 is fixedly connected to the closed end of the sliding tube 3. A first tension spring 9 is provided between the closed end of the sliding tube 3 and the fixed tube 2 and inside the sliding box 302 and the fixed box 203. When the sliding tube 3 slides in the direction away from the front end of the catheter 1, the first tension spring 9 will be stretched and accumulate elastic potential energy. When the pull rope no longer pulls the sliding tube 3, the sliding tube 3 is reset by the first tension spring 9.

[0061] In the above embodiment, please refer to Figure 8-11 A fixing ring 204 is fixedly connected to the interior of the fixed tube 2 near the front end of the catheter 1, and a magnet for adsorbing the fixing ring 204 is connected to the side of the sliding plate 8 facing the fixing ring 204. The other side of the sliding plate 8 is connected to one end of a second tension spring 10, and the other end of the second tension spring 10 is connected to the open end of the sliding tube 3.

[0062] Specifically, when the third through hole 301 corresponds to the first through hole 101, the elastic force of the second tension spring 10 is greater than the magnetic force between the magnet on the sliding plate 8 and the fixed ring 204. At this time, the sliding plate 8 will slide away from the fixed ring 204, and the liquid in the fixed tube 2 and the sliding tube 3 will be pushed out of the catheter 1 in the opposite direction. The second tension spring 10 is used to pull the sliding plate 8 toward the sliding tube 3, pushing the liquid in the fixed tube 2 and the sliding tube 3 to flow out in the opposite direction, so that the clot blocking the first through hole 101 falls off.

[0063] Furthermore, the sliding plate 8 is slidably connected to the fixed box 203, and its edge contacts the inner wall of the fixed tube 2, thereby preventing leakage from the edge of the sliding plate 8 during movement, allowing the liquid in the fixed tube 2 and the sliding tube 3 to flow out of the catheter 1 more fully. The front ends of the catheter 1 and the fixed tube 2 are provided with perforations for balancing the pressure in the space at both ends of the sliding plate 8, so that the sliding plate 8 can better promote the reverse flow of the liquid in the fixed tube 2 and the sliding tube 3. Specifically, when the sliding plate 8 moves toward the sliding tube 3, the liquid outside the catheter 1 will enter the other end of the sliding plate 8 in the fixed tube 2 through the pressure balancing hole. When the sliding tube 3 is pulled back by the first tension spring 9, the sliding plate 8 moves toward the fixed ring 204, and the liquid between the sliding plate 8 and the fixed ring 204 will be pushed out of the fixed tube 2 through the pressure balancing hole.

[0064] Second embodiment:

[0065] A drainage catheter with pressure monitoring, see Figure 1-14 Based on the first embodiment, the difference from the first embodiment is that the sliding tube 3 is circumferentially spaced apart from the front end of the catheter 1 and is provided with scrapers 303 corresponding to each first through hole 101, and a needle 304 with a length greater than the scraper 303 is further provided in the middle of the scraper 303. The scraper 303 and the needle 304 can better push the clot blocking the first through hole 101.

[0066] Furthermore, the front end of the scraper 303 is also provided with an oblique chamfer. When the sliding tube 3 slides toward the stopper 202, the needle 304 or the scraper 303 contacts the clot that partially enters the fixed tube 2 but is blocked at the first through hole 101 and the second through hole 201. As the sliding tube 3 moves, the clot can be pulled into the interior of the catheter 1 and sent out as the liquid in the catheter 1 flows, thereby achieving a dredging effect. The scrapers 303 arranged on the sliding tube 3 are also arranged in an annular interval and are staggered with the stopper 202 on the fixed tube 2 to avoid collision with the stopper 202 during the sliding of the sliding tube 3.

[0067] In the above embodiment, please refer to Figure 2-3 、 Figure 8-9 The aperture of the first through hole 101 is smaller than that of the second through hole 201. The catheter 1 is made of flexible silicone or PVE material and can undergo elastic deformation. The tube wall of the catheter 1 at the first through hole 101 can be concave and deformed toward the second through hole 201. Under the action of negative pressure in the catheter 1, the clot blocking the first through hole 101 can be closer to the axial direction of the catheter 1, and can be better scraped off when the sliding tube 3 moves.

[0068] In the above embodiment, please refer to Figure 1 、 Figure 13-14The rear end of the catheter 1 is fixedly connected to the tee tube 7. The tee tube 7 is provided with a liquid port 701 along the radial direction of the catheter 1. The liquid port 701 is connected to the negative pressure source, so that the threading tube 6 can pass through the tee tube 7 along the length direction of the catheter 1, so that the signal line and the pull rope in the threading tube 6 can smoothly pass through the catheter 1 and be connected to the negative pressure drainage device. At the same time, it also ensures that the drainage liquid can smoothly pass through the tee tube 7 and flow out from the liquid port 701.

[0069] The third embodiment:

[0070] A drainage catheter with pressure monitoring, see Figure 1-14 On the basis of the second embodiment, the difference from the second embodiment is that a spiral support belt 4 is provided inside the catheter 1 along the length direction, and a spiral fixing belt 5 is sleeved on the spiral support belt 4 along the length direction of the catheter 1. Specifically, the spiral support belt 4 is made of plastic and has a rectangular cross-section. Under the action of negative pressure in the catheter 1, it can well support the wall of the catheter 1 to prevent the catheter 1 from collapsing, and the spiral fixing belt 5 is specifically a thin steel wire columnar spring.

[0071] Furthermore, the spiral fixing band 5 contacts the inner wall of the catheter 1, and the end of the spiral support band 4 away from the spiral fixing band 5 also contacts the inner wall of the catheter 1. The spiral directions of the spiral support band 4 and the spiral fixing band 5 are different. The spiral fixing band 5 is restricted by the spiral support band 4 and maintained in a position close to the inner wall of the catheter 1. A wire threading tube 6 passes through the spiral fixing band 5. The spiral support band 4 can ensure that the catheter 1 is not easily collapsed due to negative pressure. While ensuring the structural strength of the catheter 1, it also makes the spiral fixing band 5 close to the inner wall of the catheter 1, leaving a large cross-section of the liquid passage in the catheter 1.

[0072] The present invention is specifically working as follows:

[0073] When the front end of the catheter 1 is clogged, the pull cord is pulled to slide the sliding tube 3 toward the stopper 202. During the sliding process of the sliding tube 3, the contact portion of the scraper 303 and the needle 304 at the edge is sucked into the clot in the catheter 1. As the sliding tube 3 moves, the clot is dragged into the catheter 1 and sent out along with the liquid. During the sliding process of the sliding tube 3, the liquid enters the fixed tube 2 and the sliding tube 3 through the first through hole 101, the second through hole 201, and the third through hole 301.

[0074] When the sliding tube 3 moves to the stopper 202 and all the third through holes 301 are aligned with the corresponding first through holes 101, the elastic force of the second tension spring 10 is greater than the magnetic force between the magnet and the fixed ring 204. The sliding plate 8 can move toward the sliding tube 3 during the process of the second tension spring 10 releasing the elastic potential energy, and push the liquid entering the fixed tube 2 and the sliding tube 3 out of the catheter 1 in the reverse direction. During the reverse flow of the liquid, the clot blocked in the first through hole 101 of the catheter 1 can be further washed away, thereby further alleviating the problem of the catheter 1 being blocked.

[0075] After the pull rope is loosened, the sliding tube 3 is reset by the elastic force of the first tension spring 9. When the sliding tube 3 is reset, the magnet on the sliding plate 8 and the fixing ring 204 resume the magnetic attraction state.

[0076] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A drainage catheter with pressure monitoring, characterized in that: include: A catheter, wherein a first through hole is provided on the tube wall at the front end of the catheter, and a fixed tube is fixedly connected inside the catheter, and a second through hole is provided at a position of the fixed tube corresponding to the first through hole; a sliding tube, the sliding tube being slidably connected to the fixed tube, and having a side wall provided with a third through hole corresponding to the first through hole; The sliding plate is used to press the liquid in the fixed tube out of the catheter. The outer diameter of the sliding tube is equal to the inner diameter of the fixed tube. When the sliding tube is not sliding, its end does not enter the area where the second through hole is provided in the fixed tube. The sliding tube can slide toward the area where the second through hole is provided in the fixed tube, and when sliding to the third through hole corresponding to the first through hole, it is limited by the limiting structure. The aperture of the first through hole is smaller than the aperture of the second through hole. The tube wall of the catheter at the first through hole can be concave and deformed toward the second through hole. A spiral support band is provided in the catheter along the length direction. A spiral fixing band is sleeved on the spiral support band along the length direction of the catheter. The spiral fixing band contacts the inner wall of the catheter. The end of the spiral support band away from the spiral fixing band also contacts the inner wall of the catheter. The spiral directions of the spiral support band and the spiral fixing band are different. The cam is secured to the outer wall of the sliding box and is adapted to engage the guide rails of the cam, with the guide rails being secured to the outer wall of the sliding box and adapted to engage the guide rails of the cam.

2. The drainage catheter with pressure monitoring according to claim 1, characterized in that: The sliding tube is provided with scrapers at intervals in annular direction at a position away from the front end of the catheter and corresponding to each first through hole, and a needle with a length greater than the scraper is also provided in the middle of the scraper.

3. The drainage catheter with pressure monitoring according to claim 1, characterized in that: A camera is provided at one end of the threading tube facing the fixed tube, and a drawstring for pulling the sliding tube passes through the interior along the length direction. A drawstring hole is also provided at the end of the threading tube for the drawstring to pass through.

4. The drainage catheter with pressure monitoring according to claim 1, characterized in that: The rear end of the catheter is fixedly connected to the tee pipe, and the tee pipe is provided with a liquid through port along the radial direction of the catheter.

5. The drainage catheter with pressure monitoring according to claim 1, characterized in that: The sliding plate is slidably connected to the fixing box, and its edge contacts the inner wall of the fixing tube. The front ends of the conduit and the fixing tube are provided with perforations for balancing the pressure in the space at both ends of the sliding plate.

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