Puncture device for peritoneal dialysis catheterization

Abstract

The utility model relates to a puncture device for peritoneal dialysis catheterization, and belongs to the technical field of medical instruments. The problems that in the prior art, in the peritoneal dialysis catheter indwelling operation, omentum wrapping possibly occurs, and surrounding tissues and organs are scratched are solved. Comprising a steel outer sheath, a fixing cylinder, a connecting seat, a handle, an inner core, a spring and a positioning ring, the front end of the fixing cylinder is communicated with the steel outer sheath, and the rear end of the fixing cylinder is connected with the connecting seat; the connecting seat sleeves the handle and is in sliding connection with the handle; the front end of the handle is connected with an inner core which is arranged in the steel sheath; the spring is sleeved on the inner core; the positioning ring is mounted at the front end of the handle; the spring and the positioning ring are arranged in the fixed cylinder; the front end of the spring abuts against the interior of the fixing cylinder, and the rear end of the spring abuts against the positioning ring. The peritoneal dialysis catheter is applied to the steps of puncture, infusion and guide wire feeding in peritoneal dialysis catheter catheterization. The device adopts the design that the inner core is pointed and the outer sheath is blunt, so that the occurrence rate of omentum wrapping and organ injury complications in an operation can be effectively reduced when the device is used.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a peritoneal dialysis catheterization puncture device. Background Art

[0002] In recent years, the incidence of end-stage renal disease (ESRD) has continued to increase year by year, and peritoneal dialysis (PD) has become one of the most effective renal replacement therapies for ESRD patients. PD has low requirements on physical condition, and almost all patients can receive peritoneal dialysis treatment. As a continuous treatment method, PD is closer to the normal physiological process of the human body and can maintain a stable hemodynamic state and protect residual renal function.

[0003] Peritoneal dialysis catheterization is a technique that selects the most appropriate PD catheterization point and accurately places the end of the abdominal section of the catheter in the vesicorectal pouch or uterorectal pouch. The purpose of catheterization is to establish a pathway for peritoneal dialysis fluid to enter and exit the abdominal cavity. Establishing a smooth peritoneal dialysis pathway is the first condition for PD and is also a key step.

[0004] When performing peritoneal dialysis catheterization, the traditional clinical structure of the Veress needle is a pointed outer sheath and a blunt inner core. When the catheter is placed under the peritoneum, although the blunt inner core will be ejected during the migration process, the external sharp tip may still scrape the omentum, causing the Veress needle to enter the omentum, and the omentum will be wrapped during the subsequent entry of the guide wire and catheter. Omental wrapping is a common complication of catheterization, with an incidence rate of 9%-13%. Once it occurs, it will directly affect the dialysis effect, and even require another surgery to restore the function of the peritoneal dialysis tube, increasing the patient's physical and mental pain and economic burden, and will also affect the enthusiasm of patients and medical staff.

[0005] When the guide wire is introduced into the vesicorectal pouch or uterine rectal pouch, the inner core of the pneumoperitoneum needle needs to be removed and the guide wire is inserted through the outer sheath. If the tip of the outer sheath retained in the peritoneal fluid is not fixed properly and shifted, there is a probability of scratching the surrounding tissues and organs, causing unnecessary visceral damage. In addition, when puncturing the abdominal wall, there is a possibility that abdominal wall tissue or foreign matter will enter the gap between the inner core and the outer sheath of the pneumoperitoneum needle, affecting the ejection of the inner core and causing additional damage to the abdominal wall.

[0006] How to avoid the outer sheath tip scraping the omentum during catheterization, causing catheter omentum wrapping, and scratching the organs, causing organ damage; and how to increase the puncture coordination of the inner core and outer sheath, reduce the incidence of adverse events, and better help patients with prognosis, have become common and difficult problems in clinical work. Utility Model Content

[0007] The use of the above-mentioned traditional pneumoperitoneum needle in peritoneal dialysis catheterization may cause problems of omental wrapping and scratching of surrounding tissues and organs. The purpose of the utility model is to provide a peritoneal dialysis catheterization puncture device. The device is used for puncture, infusion and guide wire placement steps in percutaneous peritoneal dialysis catheterization. The device improves the synergy of inner core and outer sheath puncture, can reduce the incidence of intraoperative omental wrapping and organ injury complications, and reduces additional damage to abdominal wall tissues, thereby improving the doctor's work efficiency and reducing the patient's pain and economic burden.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A peritoneal dialysis catheter puncture device, comprising: an outer sheath 1, a fixed tube 2, a connecting seat 3, a handle 4, an inner core 5, a spring 6 and a positioning ring 7, wherein the front end of the fixed tube 2 is connected to the outer sheath 1, and the fixed tube 2 forms a passage with the inner part of the outer sheath 1, and the rear end of the fixed tube 2 is connected to the connecting seat 3; the connecting seat 3 is sleeved on the handle 4 and is slidably connected to the handle 4; the front end of the handle 4 is connected to the inner core 5, and the inner core 5 is placed in the steel outer sheath 1; the spring 6 is sleeved on the inner core 5; the positioning ring 7 is installed at the front end of the handle 4; the spring 6 and the positioning ring 7 are both placed in the fixed tube 2; the front end of the spring 6 abuts against the fixed tube 2, and the rear end of the spring 6 abuts against the positioning ring 7.

[0010] Furthermore, the fixing cylinder 2 includes a first fixing cylinder 21 , a truncated cone-shaped fixing cylinder 22 , a second fixing cylinder 23 and a fixing cylinder connecting portion 24 which are connected in sequence. The fixing cylinder connecting portion 24 is provided with an internal thread and is threadedly connected to the connecting seat 3 .

[0011] Furthermore, the outer sheath 1 includes an outer sheath head 11 and an outer sheath body 12, the front end of the outer sheath body 12 is connected to the outer sheath head 11, and the rear end of the outer sheath body 12 is connected to the first fixed tube 21; the outer sheath head 11 is truncated cone-shaped, and the diameter of the front end of the outer sheath head 11 is smaller than the diameter of the rear end; the front end of the outer sheath head 11 is provided with an opening.

[0012] Furthermore, the handle 4 includes a handle connecting portion 41 and a handle body 42 , and the front end of the handle body 42 is connected to the handle connecting portion 41 ; the handle connecting portion 41 is provided with an external thread, and the handle connecting portion 41 is threadedly connected to the positioning ring 7 .

[0013] Furthermore, the inner core 5 includes an oblique wedge tip 51 and an inner core body 52 , the front end of the inner core body 52 is connected to the oblique wedge tip 51 , and the rear end of the inner core body 52 is connected to the handle connecting portion 41 .

[0014] Furthermore, the outer diameter of the inner core body 52 is smaller than the front end opening diameter of the outer sheath head 11 .

[0015] Furthermore, when the positioning ring 7 abuts against the connecting seat 3 , the front end of the oblique wedge tip 51 is placed in the outer sheath body 12 .

[0016] Furthermore, a knurled surface is provided on the rear periphery of the handle body 42 , and the connecting seat 3 is provided between the front end of the knurled surface of the handle body 42 and the positioning ring 7 .

[0017] Furthermore, it also includes a two-way valve 8, which includes a two-way valve switch 81, a two-way valve connected to a fixed cylinder end 82, a two-way valve connected to an infusion tube end 83 and a two-way valve body 84, and the two-way valve switch 81, the two-way valve connected to a fixed cylinder end 82 and the two-way valve connected to an infusion tube end 83 are all installed on the two-way valve body 84; the two-way valve connected to a fixed cylinder end 82 is provided with an external thread, and the two-way valve connected to a fixed cylinder end 82 matches the connecting seat 3.

[0018] Furthermore, the outer surface of the outer sheath 1 is provided with a hydrophilic coating.

[0019] Due to the adoption of the above technology, the utility model has the following positive effects compared with the prior art:

[0020] (1) The utility model adopts a design in which the inner core has a pointed tip and the outer sheath has a blunt tip. After the device is assembled, the inner core is placed inside the outer sheath, and the front end of the inner core does not leak out of the outer sheath. During puncture, due to the resistance of the outer sheath, the front end of the inner core will gradually leak out of the outer sheath, and work together with the outer sheath to perform puncture. After the front ends of the inner core and the outer sheath enter the abdominal cavity, the resistance of the outer sheath is reduced, and the outer sheath pops out under the action of the spring, covering the front end of the inner core. Next, the blunt-tipped outer sheath is used for the remaining operations to avoid scratching the omentum and reduce the incidence of intraoperative complications such as omental wrapping.

[0021] (2) The outer sheath of the utility model adopts a blunt tip design. Once it is confirmed that the device has successfully punctured into the abdominal cavity, the inner core is immediately withdrawn. Then, the blunt tip outer sheath is used for the remaining operations to avoid scratching surrounding tissues and organs, greatly reducing the possibility of medical accidents of organ damage during surgery.

[0022] (3) The diameter of the inner core body of the utility model matches the circular opening of the outer sheath head. When the oblique chopping tip is completely extended out of the outer sheath head, the circular opening of the outer sheath head fits the outer wall of the inner core body, and the inner core body closes the circular opening of the outer sheath head. This prevents abdominal wall tissue or foreign matter from entering the gap between the inner core and the outer sheath to affect the ejection of the outer sheath, increases the puncture coordination of the inner core and the outer sheath, and avoids causing additional damage to the abdominal wall tissue.

[0023] (4) The surface of the outer sheath of the utility model is coated with a hydrophilic coating, which can reduce the friction resistance between the outer sheath and the omentum and organs when the outer sheath moves in the abdomen, thereby reducing the friction damage of the outer sheath to the omentum and organs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a schematic diagram of the overall peritoneal dialysis catheter puncture device.

[0025] Figure 2 The utility model is a schematic diagram of an outer sheath and a fixing tube of a peritoneal dialysis catheter puncture device.

[0026] Figure 3 The utility model is a schematic diagram of an inner core and a handle of a peritoneal dialysis catheter puncture device.

[0027] Figure 4 The utility model is a schematic diagram of the assembly of a spring, a positioning ring, a connecting seat, an inner core and a handle of a peritoneal dialysis catheter puncture device.

[0028] Figure 5 The utility model is a cross-sectional view of a peritoneal dialysis catheter puncture device.

[0029] Figure 6 The utility model is a schematic diagram of a two-way valve of a peritoneal dialysis catheter puncture device.

[0030] In the accompanying drawings: 1. outer sheath; 11. outer sheath head; 12. outer sheath body; 2. fixed cylinder; 21. first fixed cylinder; 22. truncated cone-shaped fixed cylinder; 23. second fixed cylinder; 24. fixed cylinder connecting part; 3. connecting seat; 4. handle; 41. handle connecting part; 42. handle body; 5. inner core; 51. oblique split tip; 52. inner core body; 6. spring; 7. positioning ring; 8. two-way valve; 81. two-way valve switch; 82. two-way valve connected to the fixed cylinder end; 83. two-way valve connected to the infusion tube end; 84. two-way valve body. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0032] Please refer to Figures 1 to 6As shown, a peritoneal dialysis catheter puncture device is shown, which includes an outer sheath 1, a fixed tube 2, a connecting seat 3, a handle 4, an inner core 5, a spring 6 and a positioning ring 7. The front end of the fixed tube 2 is connected to the outer sheath 1, and the fixed tube 2 forms a passage with the inner part of the outer sheath 1, and the rear end of the fixed tube 2 is connected to the connecting seat 3; the front part of the connecting seat 3 is provided with an external thread, the front part of the connecting seat 3 extends into the fixed tube 2 and is threadedly connected to the fixed tube 2; the connecting seat 3 is sleeved on the handle 4 and is slidably connected to the handle 4; the front end of the handle 4 is connected to the inner core 5, and the inner core 5 is placed in the steel outer sheath 1; the spring 6 is sleeved on the inner core 5; the positioning ring 7 is installed at the front end of the handle 4; the spring 6 and the positioning ring 7 are Placed in the fixed tube 2; the front end of the spring 6 is against the fixed tube 2, and the rear end of the spring 6 is against the positioning ring 7. The elastic force applied by the spring 6 to the positioning ring 7 pushes the positioning ring 7 against the front end of the connecting seat 3; the front end of the outer sheath 1 is blunt, and the front end of the outer sheath 1 is provided with a circular opening; the front end of the inner core 5 is pointed, and the front end of the inner core 5 is placed in the outer sheath 1; when puncturing the abdominal wall, in the process of applying force, the outer sheath 1 encounters resistance, and the spring 6 restricted between the positioning ring 7 and the fixed tube 2 is compressed, and the front end of the inner core 5 will extend out of the outer sheath 1, and puncture together with the outer sheath 1. After entering the abdominal cavity, the resistance encountered by the outer sheath 1 is reduced, and the outer sheath 1 pops out under the action of the spring 6 to cover the front end of the inner core 5.

[0033] The fixing cylinder 2 comprises a first fixing cylinder 21, a truncated cone-shaped fixing cylinder 22, a second fixing cylinder 23 and a fixing cylinder connecting portion 24 which are connected in sequence. The fixing cylinder connecting portion 24 is provided with an internal thread, and the fixing cylinder connecting portion 24 is threadedly connected to the connecting seat 3. The front end of the spring 6 is against the inside of the truncated cone-shaped fixing cylinder 22, and the rear end of the spring 6 is connected to the front end of the positioning ring 7. The spring 6 is restricted in the truncated cone-shaped fixing cylinder 22 and the second fixing cylinder 23. The outer periphery of the second fixing cylinder 23 is provided with a gear-shaped concave-convex surface. When the fixing cylinder 2 is installed or disassembled from the connecting seat 3, the gear-shaped concave-convex surface can increase the friction with the hand, making it more convenient to use. Moreover, after the inner core 5 is withdrawn, the outer sheath 1 can be directly used conveniently.

[0034] The outer sheath 1 includes an outer sheath head 11 and an outer sheath body 12, the front end of the outer sheath 1 is the outer sheath head 11, the front end of the outer sheath body 12 is connected to the outer sheath head 11, and the rear end of the outer sheath body 12 is connected to the first fixed tube 21; the outer sheath head 11 is truncated cone-shaped, and the diameter of the front end of the outer sheath head 11 is smaller than the diameter of the rear end; the front end of the outer sheath head 11 is provided with a circular opening; further, the top edge of the truncated cone-shaped outer sheath head 11 is provided with a rounded transition; the connection between the truncated cone-shaped outer sheath head 11 and the outer sheath body 12 is provided with a rounded transition; the rounded corner design of the outer sheath head 11 ensures that after the device enters the abdominal cavity, the outer sheath head 11 will not scrape the omentum, which can reduce the incidence of intraoperative wrapping complications; when the guide wire is passed under the outer sheath 1, the outer sheath head 11 will not scratch the surrounding organs, which can reduce the incidence of malignant medical accidents. In addition, during the puncture process, when the front end of the inner core 5 extends out of the outer sheath head 11, the front end of the inner core 5 and the outer sheath head 11 together form a structure close to a cone, which is conducive to puncturing the abdominal wall together with the outer sheath 1 and the inner core 5.

[0035] The handle 4 includes a handle connecting portion 41 and a handle body 42, the front end of the handle body 42 is connected to the handle connecting portion 41; the handle connecting portion 41 is provided with an external thread, and the handle connecting portion 41 is threadedly connected to the positioning ring 7; the handle connecting portion 41 and the positioning ring 7 are detachably connected, which can facilitate the assembly of the device; further, the outer periphery of the positioning ring 7 is provided with vertical bar-shaped protrusions, which play a role in increasing friction; when puncturing the abdominal wall, the operator holds the handle body 42 and applies pressure to the puncture site.

[0036] The inner core 5 includes an oblique wedge tip 51 and an inner core body 52. ​​The front end of the inner core 5 is the oblique wedge tip 51, the front end of the inner core body 52 is connected to the oblique wedge tip 51, and the rear end of the inner core body 52 is connected to the handle connecting part 41; the inner core tip 51 is placed in the outer sheath 1 and is located close to the outer sheath head 11; further, the inner core 5 is hollow, which can reduce the weight of the device; when puncturing the abdominal wall, the outer sheath 1 will be subject to resistance, and as pressure is applied to the puncture site, the tip of the inner core tip 51 will extend out of the outer sheath head 11 and perform puncture together with the outer sheath head 11.

[0037] The outer diameter of the inner core body 52 is smaller than the diameter of the front end circular opening of the outer sheath head 11, and the axis of the inner core body 52 coincides with the axis of the front end circular opening of the outer sheath head 11; the front end of the inner core body 52 is connected to the oblique wedge tip 51, and the maximum diameter of the oblique wedge tip 51 is the outer diameter of the inner core body 52. When puncturing the abdominal wall, the inner core tip 51 will gradually extend out from the circular opening at the front end of the outer sheath head 11. When the positioning ring 7 abuts against the fixing tube 2, the inner core tip 51 will extend to the maximum distance. At this time, the entire part of the inner core tip 51 will leak out of the outer sheath head 11. At the same time, the outer periphery of the inner core body 52 abuts against the circular opening at the front end of the outer sheath head 11, thereby ensuring the stability of the inner core 5 and the outer sheath 1; in addition, when the oblique wedge tip 51 is completely extended out of the outer sheath 1, the inner core 5 closes the circular opening of the outer sheath head 11, thereby preventing abdominal wall tissue or foreign matter from entering the gap between the inner core 5 and the outer sheath 1 and affecting the ejection of the outer sheath 1, thereby increasing the puncture coordination of the inner core 5 and the outer sheath 1 and avoiding additional damage to the abdominal wall tissue.

[0038] When the positioning ring 7 abuts against the connecting seat 3 , the front end of the oblique wedge tip 51 is placed in the outer sheath body 12 ; when the positioning ring 7 abuts against the fixing tube 2 , the oblique wedge tip 51 is extended to the maximum distance relative to the outer sheath 1 .

[0039] A knurled surface is provided on the rear periphery of the handle body 42, and the connecting seat 3 is arranged between the front end of the knurled surface of the handle body 42 and the positioning ring 7; the knurled surface is designed on the rear periphery of the handle body 42, which increases the friction between the sterile gloves and the handle body 42 when puncturing the abdominal wall, making it more convenient for the doctor to hold, thereby improving the accuracy of the operation.

[0040] It also includes a two-way valve 8, which includes a two-way valve switch 81, a two-way valve connection fixed cylinder end 82, a two-way valve connection infusion tube end 83 and a two-way valve body 84. The two-way valve switch 81, the two-way valve connection fixed cylinder end 82 and the two-way valve connection infusion tube end 83 are all installed on the two-way valve body 84; the two-way valve connection fixed cylinder end 82 is provided with an external thread, and the two-way valve connection fixed cylinder end 82 matches the connection seat 3; further, the two-way valve switch 81 is made of ABS plastic. During infusion, first remove the connection seat 3 from the fixed cylinder 2, then take out the handle 4, the inner core 5, the spring 6 and the connection ring 7 from the outer sheath 1 and the fixed cylinder 2, then connect the two-way valve connection fixed cylinder end 82 with the fixed cylinder connection part 24 with a thread inside, connect the two-way valve connection infusion tube end 83 with the infusion tube, open the two-way valve switch 81 and the infusion tube flow regulator, and infuse liquid into the abdominal cavity.

[0041] The outer surface of the outer sheath 1 is provided with a hydrophilic layer, which can reduce the friction resistance between the outer sheath 1 and the omentum and organs in the abdominal cavity. Furthermore, the outer sheath 1 and the inner core 5 are both made of hardened stainless steel material, which not only improves the wear resistance of the outer sheath 1 during infusion and guide wire operation, but also improves the toughness of the inner core 5 during the puncture process. In addition, after disinfection and sterilization, the device can be reused, thereby reducing the demand for medical consumables, saving medical resources, and helping to reduce the overall medical costs, ultimately reducing the economic burden on patients.

[0042] Assembly Method:

[0043] Insert the connecting seat 3, the fixing ring 7 and the spring 6 from the front end of the inner core 5, and then install the fixing ring 7 on the front end of the handle 4. Next, extend the front end of the inner core 5 from the rear end of the fixing tube 2 until the connecting seat 3 is installed on the fixing tube 2.

[0044] Working principle:

[0045] During use, the patient takes a supine position and fully exposes the abdomen. The doctor first performs a preoperative abdominal ultrasound examination on the patient. Then, the surgical positioning is performed: 9-13cm above the pubic symphysis, 1-2cm on the right or left side of the midline. The doctor wears a cap, washes his hands, checks the patient's information again, prepares the items required for the operation, wears sterile gloves, and strictly disinfects the abdomen and lays a sterile surgical sheet. Then, local infiltration anesthesia is performed layer by layer at the surgical site. After satisfactory anesthesia, the skin is incised for about 1.5-2cm. Subsequently, the subcutaneous tissue is bluntly separated to expose the anterior rectus abdominis sheath. Then, the device is held in hand, and the outer sheath 1 is punctured at an angle of 30°-45° to puncture the anterior rectus abdominis sheath. In this process, due to the resistance of the outer sheath 1, the spring 6 is compressed, the inner core 5 moves forward, and the oblique chopping tip 51 gradually leaks out the outer sheath head 11, and acts together with the outer sheath 1 to puncture. Then it is necessary to observe whether the visceral sliding sign under the puncture point is normal and whether there are blood vessels at the puncture site. After confirmation, the device is punctured into the abdominal cavity at a minimum angle. After the front end of the oblique wedge tip 51 and the outer sheath head 11 enter the abdominal cavity, the resistance of the outer sheath 1 is reduced, and the outer sheath 1 pops up under the action of the spring, and the oblique wedge tip 51 is automatically covered, so that the oblique wedge tip 51 can be prevented from scratching tissues and organs. After confirming that the device has entered the abdominal cavity, the connecting seat 3 is removed from the fixed cylinder 2, and then the handle 4 is pulled outward, and the handle 4, the inner core 5, the spring 6 and the connecting ring 7 can be taken out. Next, the two-way valve 8 connected to the infusion tube is connected to the fixed cylinder 2, and then, the infusion connector switch 81 and the flow regulator are turned on, and peritoneal dialysis fluid or saline is input into the abdominal cavity. Observe that the liquid flow rate should be linear inflow. Then, under ultrasound guidance, the front end of the outer sheath 1 is gradually retreated to the subperitoneum and slowly advanced parallel to the peritoneum. When the outer sheath 1 approaches the predetermined position, such as the vesicorectal pouch of a male or the uterine rectal pouch of a female, and after ensuring that the front end of the outer sheath 1 is free in the peritoneal fluid, the outer sheath 1 is fixed. Next, the two-way valve 8 is removed, and then a guide wire is inserted along the fixing tube 2 and the outer sheath 1. The moving track of the guide wire can be seen under ultrasound. Finally, the guide wire is fixed and the outer sheath 1 is removed from the abdomen.

[0046] The device adopts a design of a pointed inner core 5 and a blunt outer sheath 1. After installation, the outer core is longer than the inner core, which prevents the device from scraping the omentum after puncturing into the abdominal cavity and reduces the incidence of intraoperative complications such as omental wrapping. The outer sheath 1 adopts a blunt design. Once it is confirmed that the device has successfully punctured into the abdominal cavity, the inner core 5 is immediately withdrawn, and then the blunt outer sheath 1 is used for the remaining operations, which greatly reduces the possibility of medical accidents of organ damage during surgery.

[0047] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A peritoneal dialysis catheter puncture device, characterized in that: The invention comprises an outer sheath (1), a fixing tube (2), a connecting seat (3), a handle (4), an inner core (5), a spring (6) and a positioning ring (7), wherein the front end of the fixing tube (2) is connected to the outer sheath (1), and a passage is formed between the fixing tube (2) and the inner part of the outer sheath (1), and the rear end of the fixing tube (2) is connected to the connecting seat (3); the connecting seat (3) is sleeved on the handle (4) and is slidably connected to the handle (4); the front end of the handle (4) is connected to the inner core (5), and the inner core (5) is placed in the steel outer sheath (1); the spring (6) is sleeved on the inner core (5); the positioning ring (7) is installed at the front end of the handle (4); the spring (6) and the positioning ring (7) are both placed in the fixing tube (2); the front end of the spring (6) abuts against the fixing tube (2), and the rear end of the spring (6) abuts against the positioning ring (7).

2. A peritoneal dialysis catheter puncture device according to claim 1, characterized in that: The fixed cylinder (2) comprises a first fixed cylinder (21), a truncated cone-shaped fixed cylinder (22), a second fixed cylinder (23) and a fixed cylinder connecting portion (24) which are connected in sequence, wherein the fixed cylinder connecting portion (24) is provided with an internal thread and the fixed cylinder connecting portion (24) is threadedly connected to the connecting seat (3).

3. A peritoneal dialysis catheter puncture device according to claim 2, characterized in that: The outer sheath (1) comprises an outer sheath head (11) and an outer sheath body (12); the front end of the outer sheath body (12) is connected to the outer sheath head (11), and the rear end of the outer sheath body (12) is connected to the first fixed tube (21); the outer sheath head (11) is truncated cone-shaped, and the diameter of the front end of the outer sheath head (11) is smaller than the diameter of the rear end; the front end of the outer sheath head (11) is provided with an opening.

4. A peritoneal dialysis catheter puncture device according to claim 3, characterized in that: The handle (4) comprises a handle connecting portion (41) and a handle body (42), wherein the front end of the handle body (42) is connected to the handle connecting portion (41); the handle connecting portion (41) is provided with an external thread, and the handle connecting portion (41) is threadedly connected to the positioning ring (7).

5. A peritoneal dialysis catheter puncture device according to claim 4, characterized in that: The inner core (5) comprises an oblique wedge tip (51) and an inner core body (52), the front end of the inner core body (52) is connected to the oblique wedge tip (51), and the rear end of the inner core body (52) is connected to the handle connecting portion (41).

6. A peritoneal dialysis catheter puncture device according to claim 5, characterized in that: The outer diameter of the inner core body (52) is smaller than the front end opening diameter of the outer sheath head (11).

7. A peritoneal dialysis catheter puncture device according to claim 6, characterized in that: When the positioning ring (7) abuts against the connecting seat (3), the front end of the oblique pointed head (51) is placed inside the outer sheath body (12).

8. A peritoneal dialysis catheter puncture device according to claim 7, characterized in that: The rear periphery of the handle body (42) is provided with a knurled surface, and the connecting seat (3) is arranged between the front end of the knurled surface of the handle body (42) and the positioning ring (7).

9. A peritoneal dialysis catheter puncture device according to any one of claims 1 to 8, characterized in that: The invention also comprises a two-way valve (8), wherein the two-way valve (8) comprises a two-way valve switch (81), a two-way valve connection fixed barrel end (82), a two-way valve connection infusion tube end (83) and a two-way valve body (84), wherein the two-way valve switch (81), the two-way valve connection fixed barrel end (82) and the two-way valve connection infusion tube end (83) are all mounted on the two-way valve body (84); the two-way valve connection fixed barrel end (82) is provided with an external thread, and the two-way valve connection fixed barrel end (82) matches the connection seat (3).

10. The peritoneal dialysis catheter puncture device according to claim 1, characterized in that: The outer surface of the outer sheath (1) is provided with a hydrophilic coating.

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