A peritoneal dialysis catheter repositioning device

Abstract

This invention provides a peritoneal dialysis catheter repositioning device, comprising a catheter body, a sliding plug, a gas delivery device, and an external magnet. The catheter body is inserted into the peritoneal dialysis catheter. The sliding plug is slidably disposed within the catheter body. A plate-shaped internal magnet is embedded within the sliding plug; the magnetic poles of the internal magnet are perpendicular to the axis of the catheter body. The gas delivery device forces the sliding plug forward within the catheter body to the desired segment of the peritoneal dialysis catheter for adjustment. The external magnet attracts or repels the internal magnet, thereby adjusting the catheter segment to the set position. This invention can utilize the attractive force between the external magnet and the internal magnet to move a segment of the catheter outward, or utilize repulsive force to move the segment inward. Each adjustment is a localized adjustment of the peritoneal dialysis catheter's position, not only repositioning the catheter but also adjusting and repositioning the catheter's embedding shape within the peritoneal cavity.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a peritoneal dialysis catheter repositioning device. Background Technology

[0002] Peritoneal dialysis is a form of kidney replacement therapy that uses the patient's own peritoneum as a semipermeable membrane. It offers advantages such as simplicity, safety, home-based care, and affordability, making it one of the suitable replacement therapies for uremia patients in my country, and its application is becoming increasingly widespread. The peritoneal dialysis catheter is considered the lifeline for peritoneal dialysis patients, and proper catheter function is essential for adequate dialysis. Catheter displacement is one of the most common complications in the early post-catheter placement and during maintenance peritoneal dialysis. Because the intraperitoneal segment of the peritoneal dialysis catheter is in a free state within the peritoneal cavity and usually cannot be fixed, it is prone to displacement due to intestinal peristalsis and other adverse movements. Displacement can lead to poor drainage of dialysis fluid, resulting in ineffective dialysis. If the displacement is not promptly resolved, it can even lead to omental entrapment, further causing complete catheter failure, potentially requiring repeat surgery.

[0003] When catheter displacement occurs, the traditional solution is to first attempt manual reduction (such as massaging the abdomen, tiptoeing exercises, etc.), which is non-invasive but has a low success rate. When manual reduction fails or the catheter function is poor and peritoneal dialysis cannot be performed, the current common method is surgical reduction, which is highly invasive to patients and expensive. Clinically, there is an urgent need for a peritoneal dialysis catheter reduction method that is easy to use, has low technical difficulty, and has a reliable reduction effect.

[0004] The method of repositioning using magnetic navigation technology has gradually gained attention due to its advantages of non-contact operation and reduced X-ray radiation. This technology typically relies on a magnetic guidewire inserted into the body responding to the attractive force of an external magnetic field, thereby changing its direction or position. However, existing magnetic guidewires are made of magnetic materials, which present the following problems: 1) Usually, the position of the catheter can only be adjusted by magnetic attraction; it is not possible to push the catheter to a certain position by magnetic repulsion at the same time. 2) The entire magnetic guidewire is made of magnetic material. After the magnetic guidewire is inserted into the catheter, during adjustment, the peritoneal dialysis catheter often moves towards the external magnet, making it impossible to precisely adjust the catheter's coiled shape within the abdominal cavity. Especially when the peritoneal dialysis catheter is bent at a large angle within the abdominal cavity, it is difficult to restore it using overall magnetic attraction; adjustments and repositioning can only be made segment by segment. Current integral magnetic guidewires are difficult to implement in this way.

[0005] Especially with the development of technology and the need to reduce patient suffering, peritoneal dialysis catheters need to be made more flexible. This often leads to changes in the placement of the peritoneal dialysis catheter, such as bending, which increases the difficulty of restoration.

[0006] 3) The magnetic poles on the magnetic wire are usually set along the axial direction of the wire and are perpendicular to the magnetic poles of the external magnet. This makes it impossible to form a repulsive force with the external magnet, and also greatly reduces the interaction force between the two, making it impossible to maximize the interaction force. Summary of the Invention

[0007] The purpose of this invention is to provide a peritoneal dialysis catheter repositioning device to solve at least one of the aforementioned technical problems existing in the prior art.

[0008] To solve the above-mentioned technical problems, the present invention provides a peritoneal dialysis catheter repositioning device, comprising: a catheter body, a slide (cylindrical slider), a gas delivery device, and an external magnet; The tube is used for insertion into a peritoneal dialysis catheter; The sliding plug is slidably disposed within the tube body; The slide plug is embedded with a sheet-like internal magnet; the magnetic pole direction of the internal magnet is perpendicular to the axis of the tube (or the sliding direction of the slide plug); The output end of the gas delivery device is connected to the end of the tube body through a gas passage, which is used to input gas into the tube body, thereby forcing the sliding plug to move forward in the tube body to the section of the peritoneal dialysis catheter that needs to be adjusted. The external magnet is used to attract or repel the internal magnet block, thereby adjusting the tube segment to a set position (or resetting the tube segment).

[0009] In use, first insert the tube body into the peritoneal dialysis catheter; use the gas delivery device to push the slug to the section of the peritoneal dialysis catheter that needs to be adjusted, and then use the attraction between the external magnet and the internal magnet to move the tube section outward (towards the external magnet), or use the repulsion between the external magnet and the internal magnet to move the tube section inward (away from the external magnet).

[0010] Existing magnetic guidewires are easily attracted by external magnets, causing the entire peritoneal dialysis catheter to move. In contrast, this application makes the magnet into a sheet and embeds it in the slid plug. Each adjustment is a local adjustment of the peritoneal dialysis catheter. It not only resets the position of the peritoneal dialysis catheter, but also adjusts and resets the shape of the peritoneal dialysis catheter embedded in the peritoneal cavity, thus making the adjustment more precise.

[0011] Furthermore, since the internal magnet is plate-shaped and its magnetic poles are roughly parallel to those of the external magnet, it can generate both attractive and repulsive forces, and the resulting magnetic force is also greater.

[0012] It should be noted that if the direction of the internal magnet deflects and its magnetic poles are no longer roughly parallel to the magnetic poles of the external magnet, the direction of the internal magnets can be adjusted by rotating the end of the tube, so that its magnetic poles are roughly parallel to the magnetic poles of the external magnet.

[0013] Regarding the insertion depth, preferably, the front end of the tube body is approximately flush with the intraperitoneal end of the peritoneal dialysis catheter, thereby facilitating the segmental adjustment of the entire intraperitoneal portion of the peritoneal dialysis catheter.

[0014] Furthermore, the air supply device is a manual air supply device such as a squeeze-type inflatable balloon (or one-way inflatable balloon) or an air pump.

[0015] Furthermore, a conical plug is provided at the front end of the tube to prevent the sliding plug from sliding out from the front end of the tube.

[0016] The plug also serves as a guide, used to guide the tube body into the peritoneal dialysis catheter.

[0017] Furthermore, a vent hole is provided on the side wall of the tube body near the plug at the front end. The vent hole connects the inside and outside of the tube body and is used to discharge the gas in front of the sliding plug in the tube body into the peritoneal dialysis catheter when the sliding plug moves forward (the gas can be discharged from the body through the peritoneal dialysis catheter), thereby allowing the sliding plug to slide smoothly.

[0018] Furthermore, it also includes an outer sleeve, which is fitted over the outside of the tube body; an annular gas channel is formed between the outer sleeve and the tube body; the vent hole connects the inner cavity of the tube body and the annular gas channel, and the gas in front of the sliding plug inside the tube body is discharged from the body through the annular gas channel.

[0019] Because peritoneal dialysis catheters, especially those deep within the abdominal cavity, often contain dialysate or peritoneal dialysis fluid, gas within the catheter cannot be smoothly expelled, and dialysate or peritoneal dialysis fluid can easily seep into the catheter, hindering the normal movement of the sliding plug. This application employs a double-column design, utilizing an annular gas channel between the two to expel gas from the catheter, allowing the sliding plug to move smoothly forward. Alternatively, the annular gas channel also facilitates the entry of external gas into the catheter, allowing the sliding plug to move smoothly backward.

[0020] Furthermore, the front end of the annular gas channel is closed, and the rear end (specifically, the rear end of the side wall of the outer sleeve) is provided with a second connection port for gas to enter and exit the annular gas channel. The front end of the tube is closed, and the rear end is provided with a first connection port for gas to enter and exit the tube.

[0021] Furthermore, the gas delivery end of the gas delivery device can be selectively connected to the first connection port or the second connection port to force the slide plug to move forward or backward.

[0022] That is, when the gas delivery device is connected to the first connection port, it can force the slide to move forward; when it is connected to the second connection port, it can force the slide to move backward; the above selective operation can be completed by simple manual actions such as plugging and unplugging.

[0023] Preferably, the device includes a two-position four-way valve, and the gas delivery device is connected to the first connection port and the second connection port through the two-position four-way valve, so as to realize that the gas delivery end of the gas delivery device is connected to the first connection port or the second connection port.

[0024] The specific connection method is the existing technology. The first connection port and the second connection port are respectively connected to two ports on one side of the two-position four-way valve through pipelines. The gas delivery end of the gas delivery device is connected to one port on the other side of the two-position four-way valve through pipelines. The other port on the other side of the two-position four-way valve serves as the gas outlet of the first connection port and the second connection port.

[0025] Furthermore, it also includes a pull wire, one end of which extends from the end of the tube body into the tube body and connects to the sliding plug.

[0026] As an alternative to the sleeve, the sliding plug can be forced to move sequentially by pulling the pull wire. The solution is simple and easy to implement.

[0027] Furthermore, a spiral fan blade structure is fixedly provided at the front end of the slide plug, and the gas supply end of the gas supply device is connected to the second connection port. Air is blown into the tube through the annular gas channel and the vent hole, and the slide plug is forced to rotate by means of the fan blade structure, thereby adjusting the magnetic pole direction of the magnet block inside the tube.

[0028] By adopting the above technical solution, the present invention has the following beneficial effects: This invention provides a peritoneal dialysis catheter repositioning device that can use the attractive force of an external magnet and an internal magnet block to move a segment of the catheter outward, or use the repulsive force of the two to move a segment inward. Furthermore, this application makes the magnet into a sheet shape and embeds it within a sliding plug. Each adjustment is a localized adjustment of the peritoneal dialysis catheter's position, not only repositioning the catheter but also adjusting and repositioning the catheter's embedding shape within the peritoneal cavity, thus enabling more precise adjustment.

[0029] Furthermore, since the internal magnet is plate-shaped and its magnetic poles are roughly parallel to those of the external magnet, it can generate both attractive and repulsive forces, and the resulting magnetic force is also greater. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram illustrating the working principle of the peritoneal dialysis catheter repositioning device provided in Embodiment 1 of the present invention. Figure 2 for Figure 1 A three-dimensional view of the peritoneal dialysis catheter repositioning device shown; Figure 3 This is a schematic diagram of the peritoneal dialysis catheter repositioning device provided in Example 1; Figure 4 for Figure 1 A three-dimensional view of the central tube; Figure 5 for Figure 3 Exploded view of the middle sliding plug and the internal magnet block; Figure 6 A perspective view of a second embodiment of the peritoneal dialysis catheter repositioning device provided in Example 1; Figure 7 for Figure 6 Schematic diagram of the working principle of the mid-peritoneal dialysis catheter repositioning device; Figure 8 A perspective view of the peritoneal dialysis catheter repositioning device provided in Example 2; Figure 9 for Figure 8 Schematic diagram of the structure and working principle of the mid-peritoneal dialysis catheter repositioning device; Figure 10 Schematic diagram of the structure and working principle of the second embodiment of the peritoneal dialysis catheter repositioning device provided in Example 2; Figure 11 for Figure 10 3D view of the middle sliding plug.

[0032] Figure label: 10-Peritoneal dialysis catheter; 20-Catheter body; 21-Plug; 22-Ventilation port; 23-First connection port; 30-Sliding plug; 31-Intra-body magnet; 32-Fan-blade structure; 33-Intermediate mounting hole; 40-Extra-body magnet; 50-Gas delivery device; 51-Squeezable inflation balloon; 52-Two-position four-way valve; 60-Pull cord; 70-Outer sheath; 71-Shaped gas channel; 72-Second connection port. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The present invention will be further explained below with reference to specific embodiments.

[0037] Example 1 like Figure 1-5As shown, this embodiment provides a peritoneal dialysis catheter repositioning device, comprising: a tube body 20, a sliding plug 30, a gas delivery device 50, and an external magnet 40; the tube body 20 is used to insert into the peritoneal dialysis catheter 10; the sliding plug 30 is slidably disposed within the tube body 20; a sheet-like internal magnet block 31 is embedded within the sliding plug 30; the magnetic pole direction of the internal magnet block 31 is perpendicular to the axial direction of the tube body 20 (or the sliding direction of the sliding plug 30); in this embodiment, the sliding plug 30 is a cylindrical slider, preferably made of medical-grade materials such as silicone, stainless steel, or ceramic. (Refer to...) Figure 5 As shown, the internal magnet 31 is inserted into the middle mounting hole 33 of the slide plug 30.

[0038] The output end of the gas delivery device 50 is connected to the end of the tube body 20 through a gas passage, and is used to input gas into the tube body 20, thereby forcing the sliding plug 30 to move forward within the tube body 20 to the section of the peritoneal dialysis catheter 10 that needs to be adjusted. The external magnet 40 is used to attract or repel the internal magnet block 31, thereby adjusting the tube segment to be adjusted to the set position and resetting the tube segment to be adjusted.

[0039] In use, the tube body 20 is first inserted into the peritoneal dialysis catheter 10; the gas delivery device 50 is used to push the sliding plug 30 to the section of the peritoneal dialysis catheter 10 that needs to be adjusted; then, the attraction between the external magnet 40 and the internal magnet 31 is used to move the tube section outward (towards the external magnet 40), or the repulsive force between the external magnet 40 and the internal magnet 31 is used to move the tube section inward (away from the external magnet 40).

[0040] In the prior art, the magnetic guidewire is easily attracted by the external magnet 40, causing the entire peritoneal dialysis catheter 10 to move. However, in this application, the magnet is made into a sheet and embedded in the sliding plug 30. Each adjustment is a local adjustment of the peritoneal dialysis catheter 10. It not only resets the position of the peritoneal dialysis catheter 10, but also adjusts and resets the shape of the peritoneal dialysis catheter 10 embedded in the peritoneal cavity, thus making the adjustment more precise.

[0041] Furthermore, since the internal magnet 31 is plate-shaped and its magnetic pole direction is roughly parallel to that of the external magnet 40, it can generate both attractive and repulsive forces, and the resulting magnetic force is also greater.

[0042] It should be noted that if the direction of the internal magnet 31 deflects and its magnetic pole direction is not roughly parallel to that of the external magnet 40, the magnetic pole direction of the internal magnet 31 can be adjusted by rotating the end of the tube 20, so that its magnetic pole direction is roughly parallel to that of the external magnet 40.

[0043] In terms of insertion depth, preferably, the front end of the tube body 20 is approximately flush with the intraperitoneal end of the peritoneal dialysis catheter 10, thereby facilitating the segmental adjustment of the position of the entire intraperitoneal portion of the peritoneal dialysis catheter 10.

[0044] Furthermore, the air supply device 50 is preferably a pinch-type air-blowing balloon 51 (or a one-way air-blowing balloon), or other manual air supply device such as an air pump.

[0045] Furthermore, a conical plug 21 is provided at the front end of the tube body 20 to prevent the sliding plug 30 from sliding out of the front end of the tube body 20. The plug 21 also functions as a guide head to guide the tube body 20 into the peritoneal dialysis catheter 10.

[0046] A vent 22 is provided on the side wall of the tube body 20 near the plug 21 at the front end. The vent 22 connects the inside and outside of the tube body 20. When the sliding plug 30 moves forward, the gas in front of the sliding plug 30 in the tube body 20 is discharged into the peritoneal dialysis catheter 10 (the gas can be discharged from the body through the peritoneal dialysis catheter 10), so that the sliding plug 30 can slide smoothly.

[0047] like Figure 6-7 As shown, this embodiment may optionally include a pull wire 60, one end of which extends from the end of the tube body 20 into the tube body 20 and connects to the sliding plug 30. When it is necessary to retract the sliding plug 30, simply pull the pull wire 60 gently to force the sliding plug 30 to move backward and align it with the section of tube requiring adjustment. Preferably, the outer end of the pull wire 60 may extend through a central hole in the bottom plate or end cap at the end of the tube body 20; an elastic sealing ring is provided at the central hole to seal the gap between the pull wire 60 and the central hole, thereby reducing gas leakage.

[0048] This invention provides a peritoneal dialysis catheter 10 repositioning device. It can utilize the attractive force of an external magnet 40 and an internal magnet block 31 to move a segment of the catheter outwards, or utilize their repulsive force to move a segment inwards. Furthermore, this application makes the magnet into a sheet shape and embeds it within the sliding plug 30. Each adjustment is a localized adjustment of the peritoneal dialysis catheter 10, not only repositioning the catheter but also adjusting and repositioning its embedding shape within the abdominal cavity, thus enabling more precise adjustment.

[0049] Furthermore, since the internal magnet 31 is plate-shaped and its magnetic pole direction is roughly parallel to that of the external magnet 40, it can generate both attractive and repulsive forces, and the resulting magnetic force is also greater.

[0050] Example 2 This embodiment is basically the same as Embodiment 1, except that: See Figure 8 and 9 As shown, this embodiment also includes an outer tube 70, which is fitted over the outside of the tube body 20; an annular gas channel 71 is formed between the outer tube 70 and the tube body 20; the vent 22 connects the inner cavity of the tube body 20 and the annular gas channel 71, and the gas in front of the sliding plug 30 inside the tube body 20 is discharged from the body through the annular gas channel 71. Since the gas input into the gas delivery device 50 is ultimately discharged from the body through the annular gas channel 71, it will not come into contact with the patient's wound and internal organs, making the arrangement more reliable; the input gas can be air.

[0051] Because the peritoneal dialysis catheter 10, especially the section extending deep into the abdominal cavity, often contains dialysis fluid or peritoneal dialysis fluid, the gas inside the catheter body 20 cannot be smoothly discharged, and dialysis fluid or peritoneal dialysis fluid may even seep into the catheter body 20, obstructing the normal movement of the sliding plug 30. This application employs a double-tube design, utilizing an annular gas channel 71 between the two tubes to discharge the gas inside the catheter body 20, allowing the sliding plug 30 to move smoothly forward. Alternatively, the annular gas channel 71 also facilitates the entry of external gas into the catheter body 20, allowing the sliding plug 30 to move smoothly backward.

[0052] Furthermore, the annular gas channel 71 is closed at the front end and a second connection port 72 is provided at the rear end (specifically, the rear end of the side wall of the outer sleeve 70) for gas to enter and exit the annular gas channel 71; the tube body 20 is closed at the front end and a first connection port 23 is provided at the rear end for gas to enter and exit the tube body 20.

[0053] Furthermore, the gas delivery end of the gas delivery device 50 can be selectively connected to either the first connection port 23 or the second connection port 72 to force the sliding plug 30 to move forward or backward. That is, when the gas delivery device 50 is connected to the first connection port 23, gas is input into the tube body 20 and the rear of the sliding plug 30, which can force the sliding plug 30 to move forward; as an alternative to the pull cable 60, when the gas delivery device 50 is connected to the second connection port 72, gas is input into the front of the tube body 20 and the sliding plug 30, which can force the sliding plug 30 to move backward; the above selective operation can be completed by simple manual actions such as plugging and unplugging.

[0054] Preferably, see Figure 10As shown, this embodiment includes a two-position four-way valve 52. The gas delivery device 50 is connected to the first connection port 23 and the second connection port 72 via the two-position four-way valve 52, enabling the gas delivery end of the gas delivery device 50 to be connected to either the first connection port 23 or the second connection port 72. The two-position four-way valve 52 is preferably an electromagnetic control valve, allowing for switching of control positions through simple energization and de-energization. Specifically, the connection method is conventional: the first connection port 23 and the second connection port 72 are respectively connected to two ports on one side of the two-position four-way valve 52 via pipelines, and the gas delivery end of the gas delivery device 50 is connected to one port on the other side of the two-position four-way valve 52 via a pipeline; the other port on the other side of the two-position four-way valve 52 serves as the gas outlet for both the first connection port 23 and the second connection port 72.

[0055] More preferably, see Figure 10 and 11 As shown, a spiral fan blade structure 32 is fixedly provided at the front end of the slide plug 30. The air supply end of the air supply device 50 is connected to the second connection port 72. Air is blown into the tube body 20 through the annular gas channel 71 and the vent hole 22. The fan blade structure 32 forces the slide plug 30 to rotate, thereby adjusting the magnetic pole direction of the internal magnet block 31.

[0056] The tube body 20 and the outer tube 70 are preferably made of medical-grade silicone or rubber. During use, it is usually necessary to use imaging technology such as ultrasound to obtain the position and shape information of the peritoneal dialysis catheter 10 before inserting the tube body 20 and the outer tube 70 into the peritoneal dialysis catheter 10. At the same time, the position information of the sliding plug 30 and the orientation information (i.e., magnetic pole direction information) of the internal magnet 31 are obtained using imaging technology such as ultrasound. The sliding plug 30 is made of non-metallic materials such as medical rubber and resin to avoid interfering with the image information of the internal magnet 31.

[0057] After confirming that the slide plug 30 has moved into place and that the posture and magnetic pole direction of the internal magnet 31 have been adjusted using ultrasound and other image acquisition technologies, the external magnet 40 is used to attract or repel the internal magnet 31, thereby adjusting the position of a segment of the peritoneal dialysis catheter 10 and adjusting the overall layout of the peritoneal dialysis catheter 10.

[0058] When the tubing 20 is inserted deep into the peritoneal dialysis catheter 10, it is difficult to force the stopper 30 and the internal magnet 31 to rotate simply by rotating the tubing 20. Alternatively, selecting the tubing 20 itself may be difficult, easily causing the peritoneal dialysis catheter 10 to move or rotate as well, resulting in secondary injury to the patient. This embodiment, through simple reverse air blowing, forces the stopper 30 to move backward while simultaneously rotating it, changing the magnetic pole direction of the internal magnet 31; it is simple, reliable, and safe.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A peritoneal dialysis catheter repositioning device, characterized in that, include: Tube body, slug, gas delivery device, and external magnet; The tube is used for insertion into a peritoneal dialysis catheter; The sliding plug is slidably disposed within the tube body; The slide plug is embedded with a sheet-like internal magnet; the magnetic pole direction of the internal magnet is perpendicular to the axis of the tube. The output end of the gas delivery device is connected to the end of the tube body through a gas passage, which is used to input gas into the tube body, thereby forcing the sliding plug to move forward in the tube body to the section of the peritoneal dialysis catheter that needs to be adjusted. The external magnet is used to attract or repel the internal magnet block, thereby adjusting the tube segment to a set position.

2. The peritoneal dialysis catheter repositioning device according to claim 1, characterized in that, The gas delivery device is a squeeze-type inflatable balloon.

3. The peritoneal dialysis catheter repositioning device according to claim 1, characterized in that, The front end of the tube is provided with a conical plug to prevent the sliding plug from sliding out of the front end of the tube.

4. The peritoneal dialysis catheter repositioning device according to claim 1, characterized in that, A vent hole is provided on the side wall of the tube body near the plug at the front end. The vent hole connects the inside and outside of the tube body and is used to discharge the gas in front of the sliding plug in the tube body into the peritoneal dialysis catheter when the sliding plug moves forward, so as to allow the sliding plug to slide smoothly.

5. The peritoneal dialysis catheter repositioning device according to claim 4, characterized in that, It also includes an outer tube, which is fitted over the outside of the tube body; an annular gas channel is formed between the outer tube and the tube body; the vent hole connects the inner cavity of the tube body and the annular gas channel, and the gas in front of the sliding plug inside the tube body is discharged from the body through the annular gas channel.

6. The peritoneal dialysis catheter repositioning device according to claim 5, characterized in that, The annular gas channel is closed at the front end and has a second connection port at the rear end for gas to enter and exit the annular gas channel; the pipe body is closed at the front end and has a first connection port at the rear end for gas to enter and exit the pipe body.

7. The peritoneal dialysis catheter repositioning device according to claim 6, characterized in that, The gas delivery end of the gas delivery device can be selectively connected to the first connection port or the second connection port to force the slide to move forward or backward.

8. The peritoneal dialysis catheter repositioning device according to claim 7, characterized in that, Includes a two-position four-way valve, the gas delivery device is connected to the first connection port and the second connection port through the two-position four-way valve, so as to realize the gas delivery end of the gas delivery device is connected to the first connection port or the second connection port.

9. The peritoneal dialysis catheter repositioning device according to claim 1, characterized in that, It also includes a pull wire, one end of which extends from the end of the tube body into the tube body and connects to the sliding plug.

10. The peritoneal dialysis catheter repositioning device according to claim 1, characterized in that, The front end of the slide is fixedly provided with a spiral fan blade structure. The gas supply end of the gas supply device is connected to the second connection port. Air is blown into the tube through the annular gas channel and the vent hole. The fan blade structure forces the slide to rotate, thereby adjusting the magnetic pole direction of the magnet block inside the tube.

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