PICC (Peripherally Inserted Central Catheter) capable of reducing maintenance requirements

Abstract

The invention discloses a PICC (Peripherally Inserted Central Catheter) capable of reducing maintenance requirements, which adopts guide-wire-free ultrasonic guidance and comprises a catheter body and an injection head, the rear end of the catheter body is connected with one end of the injection head; the catheter head comprises a nipple-shaped end part; the joint of the root part of the nipple-shaped end part and the catheter wall of the catheter body is pre-bent into an S shape to form an S-shaped joint part; a plurality of through holes are formed in the positions, close to the catheter wall of the catheter body, of the S-shaped connecting part; the other end of the injection head is connected with an injection port and a suction port; the injection port and the suction port are respectively communicated with the catheter body through a flow guide cavity in the injection head; a suction tube for suction is mounted on the suction opening; through the innovative design of the PICC tube structure and the tube sealing mode, the defects of a traditional PICC tube in the aspects of tube sealing, maintenance, blocking and safety are effectively overcome, and a safer, simpler and lower-maintenance solution is provided for long-term vein therapy.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to a PICC catheter that can reduce maintenance requirements. Background Art

[0002] A peripherally inserted central catheter is a long catheter inserted through a peripheral vein and extending to the central vein, mainly used for long-term intravenous infusion, chemotherapy, intravenous nutrition, blood transfusion and other treatments. Since it can reduce the pain of repeated venous punctures, protect blood vessels and reduce the risk of infection, PICC catheters are widely used in the fields of cancer treatment, blood disease treatment and long-term antibiotic infusion.

[0003] Deficiencies of the Prior Art

[0004] Complicated catheter flushing: Traditional PICC catheters require positive pressure operation and heparin flushing during catheter flushing, with complicated steps that increase the operation burden of nursing staff and also increase the bleeding risk of patients.

[0005] Frequent maintenance: To prevent thrombus formation, traditional PICC catheters require frequent flushing and catheter flushing operations, increasing the frequency and complexity of nursing.

[0006] High risk of catheter blockage: Existing catheter flushing techniques cannot completely avoid the risk of blood reflux and catheter blockage. Especially during the period when the catheter is not in use, blood coagulation may occur inside the catheter, leading to blockage or other complications.

[0007] Low catheter safety: During daily operations, if the catheter is not properly closed or the air is not completely emptied, air may enter the blood vessels, leading to serious complications such as air embolism.

[0008] Heparin flushing is a common PICC catheter maintenance method used to prevent blood reflux and catheter blockage. However, some problems may occur during the use of heparin flushing:

[0009] Bleeding risk: Heparin inhibits blood coagulation function, and long-term use may cause bleeding in patients, especially in patients with coagulation disorders.

[0010] Heparin-induced thrombocytopenia (HIT): Heparin may trigger an immune response, resulting in thrombocytopenia and thrombus formation.

[0011] Allergic reaction: Some patients are allergic to heparin and may experience rashes, difficulty breathing, or even anaphylactic shock.

[0012] Excessive anticoagulant: Excessive heparin during catheter flushing may cause systemic anticoagulation and increase the bleeding risk.

[0013] Thrombus formation: Heparin flushing may lead to fibrin deposition at the catheter tip, increasing the risk of blockage.

[0014] Infection risk: When operated improperly, heparin may cause catheter-related infections.

[0015] Complicated operation and high cost: Heparin flushing is frequent and complex, increasing the nursing burden and cost. Summary of the Invention

[0016] The object of the present invention is: The present invention aims to provide a PICC catheter that can reduce maintenance requirements. Through innovative designs in the structure and flushing method of the PICC catheter, the present invention effectively solves the deficiencies of traditional PICC catheters in terms of flushing, maintenance, blockage, and safety, providing a safer, simpler, and lower-maintenance solution for long-term intravenous therapy.

[0017] The technical solution adopted by the present invention is as follows:

[0018] A PICC catheter that can reduce maintenance requirements, using wire-free ultrasound guidance, includes a catheter body and an injection head; the rear end of the catheter body is connected to one end of the injection head, and the front end is the catheter head; the catheter head includes a papillary end; the connection between the root of the papillary end and the catheter body wall is pre-bent into an S shape to form an S-shaped connection part; a plurality of through holes are opened at a position close to the catheter body wall of the S-shaped connection part; the other end of the injection head is connected to an injection port and a suction port; the injection port and the suction port are respectively connected to the catheter body through a diversion cavity inside the injection head; a suction cylinder for suction is installed on the suction port; by sucking outward through the suction cylinder, a negative pressure is formed inside the catheter body, and under the action of the negative pressure, the papillary end moves backward and the S-shaped connection part squeezes outward to touch the inner wall of the catheter body to close the connection between the through holes and the inside of the catheter body.

[0019] Among them, the catheter body is connected to the injection head through a sliding lock ring.

[0020] Among them, the suction cylinder includes a cylinder body, a piston, and a piston rod; a connection port is provided at the front end of the cylinder body; the connection port is connected to the suction port; a notch for locking the position is opened along the length direction of the piston rod; a rotatable flap is provided at the rear end of the cylinder body; the rotatable flap can interfere with the notch to lock the position of the piston rod.

[0021] Among them, the catheter body and the catheter head are integrally formed and made of silicone rubber.

[0022] Among them, the papillary end is round and blunt, the maximum diameter is smaller than the outer diameter of the catheter body; the diameter range is 2.5 - 3.0 mm; it protrudes 1.5 - 2.5 mm from the catheter body.

[0023] Among them, the overall length range of the S-shaped connection part including two curved parts is 10 - 15 mm.

[0024] Among them, fixed wings are unfolded outward on the injection head to facilitate fixing the injection head.

[0025] Among them, a method for peripherally inserted central venous catheterization using the described PICC tube includes the following steps:

[0026] S1. Preoperative preparation and catheter insertion:

[0027] Sterile operation preparation: Operate in a sterile environment. Medical staff wear gloves and masks and prepare the required equipment, including a PICC catheter, an ultrasound device, a syringe, normal saline, and disinfection supplies; Select a puncture point under ultrasound guidance: Use ultrasound guidance to select a suitable vein and determine the insertion depth of the catheter;

[0028] Venipuncture and catheter insertion: Use a puncture needle to puncture the vein. After confirming blood return, introduce the PICC catheter body; Under ultrasound guidance, gradually advance the catheter head near the superior vena cava. At this time, the catheter head is in a normal state and the through hole is open;

[0029] S2. Injecting medicine:

[0030] Air evacuation before injection: Connect the syringe to the injection port and ensure that all the air in the syringe is completely expelled until liquid flows out of the syringe, evacuating all air bubbles. Check the connection port of the syringe to ensure good sealing and no air bubbles;

[0031] Injecting medicine or normal saline: Slowly inject the medicine or normal saline, maintaining a stable pushing force to reduce pressure fluctuations inside the catheter; Use the "pulsed" injection method to form a turbulent flow, which helps to remove residues remaining on the inner wall of the catheter and ensure the smooth flow of the medicine into the patient's blood;

[0032] S3. Sealing the catheter:

[0033] Flushing before sealing the catheter: Flush the catheter with normal saline to ensure that there is no residual medicine or blood inside the catheter;

[0034] Slowly inject normal saline using the pulsed injection method to remove blood or drug residues on the inner wall of the catheter;

[0035] Connect the suction device: Connect the connection port of the suction cylinder to the suction port to prepare for negative pressure operation;

[0036] Negative pressure formation: By pulling the piston rod of the suction cylinder outward, draw out the normal saline inside the catheter to form a negative pressure state; Under the action of negative pressure, the papillary end of the catheter head moves backward, and the S-shaped connecting part gradually compresses the inner wall of the catheter to close the through hole, ensuring isolation between the inside of the catheter and the external blood vessel;

[0037] S4. Sterile sealing and fixation:

[0038] Sterile Sealing Treatment: After sealing the catheter, connect the end of the catheter to a needleless sealing device or a needleless injection cap to ensure good sealing at the end of the catheter and prevent air from entering the catheter; cover the catheter insertion site with a sterile dressing to ensure a sterile environment at the skin and catheter interface.

[0039] Catheter Fixation: Use medical tape or a special fixation device to fix the catheter to the patient's skin to ensure that the catheter does not shift or get pulled during daily activities.

[0040] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0041] The PICC catheter of the present invention has multiple beneficial effects, aiming to achieve the goals of reducing maintenance requirements, enhancing safety, and simplifying the operation process through specific structural designs and improved operation methods:

[0042] 1. Reducing Maintenance Requirements

[0043] Negative Pressure Sealing Mechanism: Generate negative pressure through the suction cylinder, and the S-shaped connection part automatically seals the through hole to prevent blood from flowing back into the catheter. This design automatically isolates the blood when the catheter is not in use, reducing the possibility of thrombus formation and thus lowering the catheter maintenance frequency.

[0044] Reducing Heparin Use: In traditional PICC catheter sealing, heparin is used to prevent blood reflux and coagulation. However, after adopting negative pressure sealing, heparin sealing can be reduced or replaced, thereby reducing the bleeding risk and drug dependence caused by heparin use and further simplifying the nursing process.

[0045] 2. Enhancing Catheter Sealing Effect and Safety

[0046] Automatic Sealing Function of the S-shaped Connection Part: Under the action of negative pressure, the S-shaped connection part is pressed tightly to ensure that the through hole is completely sealed. Compared with the traditional catheter sealing method, this design is more reliable, can effectively prevent blood reflux, and reduce the risk of catheter blockage.

[0047] Flexible Design of the Papillary End: The softness and blunt shape of the papillary end can move backward under negative pressure, while avoiding irritation and damage to the blood vessel wall, enhancing the patient's comfort and the safety of the catheter.

[0048] Silicone Rubber One-piece Molding: The catheter body and the head are made of silicone rubber by one-piece molding, which not only increases the flexibility of the catheter, but also enhances the durability and biocompatibility of the catheter, further reducing the risk of infection and blood vessel damage.

[0049] 3. Simplifying the Operation Process

[0050] Wireless Ultrasound-guided Catheterization: By using the method of wireless ultrasound guidance, the catheter is directly introduced through the puncture needle, eliminating the step of wire introduction, reducing the operation steps and time, and also reducing the potential harm to blood vessels.

[0051] Automated Negative Pressure Catheter Sealing: No additional heparin operation is required during catheter sealing. Automatic sealing can be achieved through negative pressure aspiration, avoiding multiple operations of positive pressure and heparin in traditional catheter sealing. This design simplifies the operation steps of nursing staff, saves time and improves nursing efficiency.

[0052] Sliding Lock Ring and Fixing Wing: The catheter body is connected to the injection head through a sliding lock ring, increasing the connection stability; the design of the fixing wing facilitates the rapid fixation of the catheter on the skin, reducing catheter displacement and nursing time.

[0053] 4. Reduce the Risk of Complications

[0054] Automated Closed Through-hole Design: The front end of the catheter is physically sealed under negative pressure, which can effectively prevent air from entering the catheter and reduce the risk of air embolism. At the same time, in the closed state, a sterile environment is maintained inside the catheter, reducing the incidence of catheter-related infections.

[0055] Bubble-free Injection Design throughout the Process: When injecting the drug solution, by evacuating the air in the syringe, maintaining a stable thrust and pulsed injection, etc., it is ensured that the liquid in the catheter flows smoothly, reducing the possibility of air injection and further ensuring patient safety.

[0056] 5. Improve the Reliability of Long-term Use

[0057] Versatile Design of the Catheter Tip: The combined design of the S-shaped connection part and the papillary end not only supports negative pressure sealing but also keeps it unobstructed when injecting the drug solution and flushing the catheter. The dual-function design improves the adaptability of the catheter and the reliability of long-term use.

[0058] Reduce the Frequency of Catheter Blockage: Through pulsed injection, saline flushing and negative pressure sealing mechanism, the residual drugs or blood on the inner wall of the catheter are effectively removed, thereby reducing the risk of catheter blockage and improving the stability of the catheter during long-term infusion.

[0059] 6. Adapt to Different Clinical Needs

[0060] Optimized Design of the Number and Position of Through-holes: The design of multiple through-holes on the catheter body near the S-shaped connection part helps to disperse the drug solution during normal injection, improving the drug infusion efficiency. When performing negative pressure catheter sealing, the through-holes are automatically sealed, effectively preventing the backflow of the drug solution or blood.

[0061] Versatility in different states: In the state of sealed catheter, the catheter is automatically sealed by negative pressure; while during infusion and cleaning, the catheter returns to a patent state. This multifunctional design meets the requirements of different clinical operations, making the PICC catheter more applicable.

[0062] Summary:

[0063] The PICC tube of the present invention realizes beneficial effects such as reducing maintenance requirements, enhancing safety, simplifying the operation process, reducing the risk of complications, and improving long-term use reliability through a specific negative pressure sealing design, a flexible papillary end, an S-shaped connection part, and an integrally formed catheter structure. These characteristics not only improve the functionality of the PICC tube, but also significantly reduce the operation burden of medical staff in clinical nursing, while also improving the treatment comfort and safety of patients. Brief Description of the Drawings

[0064] Figure 1 It is a schematic structural diagram of the PLCC tube of the present invention under normal conditions;

[0065] Figure 2 It is a schematic diagram of the state of the catheter head of the PLCC tube of the present invention under normal conditions;

[0066] Figure 3 It is a schematic structural diagram of the PLCC tube of the present invention in the state of negative pressure sealed catheter;

[0067] Figure 4 It is a schematic diagram of the state of the catheter head of the PLCC tube of the present invention in the state of negative pressure sealed catheter.

[0068] Reference numerals in the figures: 1, catheter body; 2, injection head; 21, injection port; 22, suction port; 23, fixing wing; 3, catheter head; 31, papillary end; 32, S-shaped connection part; 33, through hole; 4, suction cylinder; 41, cylinder body; 42, piston; 43, piston rod; 44, connection port; 46, notch; 47, rotatable shutter. Detailed Description of the Invention

[0069] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0070] See Figures 1 to 4, this invention relates to a PICC tube that can reduce maintenance requirements. It uses wire-free ultrasonic guidance and includes a catheter body 1 and an injection head 2. The rear end of the catheter body 1 is connected to one end of the injection head 2, and the front end is the catheter head 3. The catheter head 3 includes a papillary end 31. The connection between the root of the papillary end 31 and the wall of the catheter body 1 is pre-bent into an S shape to form an S-shaped connection part 32. Multiple through holes 33 are provided at a position close to the wall of the catheter body 1 in the S-shaped connection part 32. The other end of the injection head 2 is connected to an injection port 21 and a suction port 22. The injection port and the suction port are respectively connected to the catheter body 1 through a diversion cavity inside the injection head 2. A suction cylinder 4 for suction is installed on the suction port 22. By sucking outwards through the suction cylinder 4, a negative pressure is formed inside the catheter body 1. Under the action of the negative pressure, the papillary end 31 moves backward and the S-shaped connection part 32 squeezes outwards to touch the inner wall of the catheter body 1 to close the connection between the through hole 33 and the inside of the catheter body 1.

[0071] In this embodiment, the catheter body 1 is connected to the injection head 2 through a sliding lock ring.

[0072] In this embodiment, the suction cylinder 4 includes a cylinder body 41, a piston 42, and a piston rod 43. A connection port 44 is provided at the front end of the cylinder body 41. The connection port 44 is connected to the suction port 22. A notch 46 for locking the position is provided along the length direction of the piston rod 43. A rotatable stop piece 47 is provided at the rear end of the cylinder body 41. The rotatable stop piece 47 can interfere with the notch 46 to lock the position of the piston rod 43, achieving the position locking of the piston rod. This design can maintain the continuous negative pressure state inside the catheter and ensure the stable and lasting sealing effect.

[0073] In this embodiment, the catheter body 1 and the catheter head 3 are integrally formed and made of silicone rubber. Silicone rubber has high flexibility, good biocompatibility, and tear resistance, which helps to reduce friction against the blood vessel wall and reduce the risk of blood vessel injury.

[0074] In this embodiment, the papillary end 31 is round and blunt, and its maximum diameter is smaller than the outer diameter of the catheter body 1. The diameter range is 2.5 - 3.0 mm, ensuring reduced resistance during advancement in the blood vessel and providing sufficient sealing effect. It protrudes 1.5 - 2.5 mm from the catheter body 1, which helps to move backward under negative pressure to close the through hole. The protruding part helps to shift backward under negative pressure to achieve effective sealing.

[0075] In this embodiment, the overall length range of the S-shaped connection part 32 including two curved parts is 10 - 15 mm. The S-shaped bend provides a resilient force, which helps to restore the normal shape of the catheter after the negative pressure is released and maintain the patency and flexibility of the catheter. Combining with the round and blunt shape of the papillary end 31, it automatically drives the outward expansion of the root when moving backward, thereby increasing the curvature of the S-shaped bend and automatically pressing against the inner wall of the catheter body 1 to achieve the sealing of the front end.

[0076] In this embodiment, the through hole 33 allows the liquid medicine or normal saline to flow out freely during injection and flushing, forming a turbulent flow, which helps to remove the residues on the inner wall of the catheter.

[0077] In this embodiment, the injection head 2 is outwardly expanded with fixing wings 23 to facilitate the fixation of the injection head 2. It is used to facilitate the fixation of the catheter after insertion, prevent the catheter from shifting on the skin surface, and improve the use safety.

[0078] In this embodiment, a method for peripherally inserted central venous catheter uses a PICC tube, including the following steps:

[0079] S1. Preoperative preparation and catheter insertion:

[0080] Sterile operation preparation: Operate in a sterile environment. Medical staff wear gloves and masks, and prepare the required equipment, including a PICC catheter, an ultrasound instrument, a syringe, normal saline, and disinfection supplies;

[0081] Select the puncture point under ultrasound guidance: Use ultrasound guidance to select a suitable vein and determine the insertion depth of the catheter;

[0082] Venous puncture and catheter insertion: Use a puncture needle to puncture the vein. After confirming blood return, introduce the PICC catheter body 1; under ultrasound guidance, gradually advance the catheter head 3 near the superior vena cava. At this time, the catheter head is in a normal state and the through hole 33 is open;

[0083] S2. Inject liquid medicine:

[0084] Air evacuation before injection: Connect the syringe to the injection port 21 and ensure that all the air in the syringe is completely discharged until the liquid flows out of the syringe, evacuate all the air bubbles, check the connection port of the syringe to ensure good sealing and no air bubbles;

[0085] Inject the drug or normal saline: Slowly push the drug or normal saline, maintain a stable pushing force to reduce the pressure fluctuation in the catheter; use the "pulsed" injection method to form a turbulent flow, which helps to remove the residues on the inner wall of the catheter and ensure that the drug flows smoothly into the patient's blood;

[0086] S3. Seal the catheter:

[0087] Flush before sealing the catheter: Use normal saline to flush the catheter to ensure that there is no residual liquid medicine or blood in the catheter; slowly push the normal saline and use the pulsed injection method to remove the blood or drug residues on the inner wall of the catheter;

[0088] Connect the aspiration device: Connect the connection port 44 of the aspiration cylinder 4 to the aspiration port 22 to prepare for negative pressure operation;

[0089] Negative pressure formation: By pulling out the piston rod 43 of the suction cylinder 4 outward, the physiological saline inside the catheter is extracted to form a negative pressure state; under the action of negative pressure, the papillary end 31 of the catheter head 3 moves backward, and the S-shaped connecting part 32 gradually compresses the inner wall of the catheter to seal the through hole 33, ensuring that the inside of the catheter is isolated from the external blood vessel;

[0090] S4. Aseptic sealing and fixation:

[0091] Aseptic sealing treatment: After sealing the catheter, connect the end of the catheter to a needleless sealing device or a needleless injection cap to ensure good sealing at the end of the catheter and prevent air from entering the catheter; cover the catheter insertion point with a sterile dressing to ensure an aseptic environment at the skin and catheter interface;

[0092] Catheter fixation: Use medical tape or a special fixation device to fix the catheter on the patient's skin to ensure that the catheter does not shift or get pulled during daily activities.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A PICC tube that can reduce maintenance requirements, using wire-free ultrasound guidance, includes a catheter body (1) and an injection head (2); the rear end of the catheter body (1) is connected to one end of the injection head (2), and the front end is the catheter head (3); it is characterized in that: The catheter head (3) includes a papillary end (31); the junction of the root of the papillary end (31) and the wall of the catheter body (1) is pre-bent into an S shape to form an S-shaped junction (32); a plurality of through holes (33) are provided at a position of the S-shaped junction (32) close to the wall of the catheter body (1); the other end of the injection head (2) is connected to an injection port (21) and a suction port (22); the injection port and the suction port are respectively communicated with the catheter body (1) through a diversion cavity inside the injection head (2); a suction cylinder (4) for suction is installed on the suction port (22); by sucking outwards through the suction cylinder (4), a negative pressure is formed inside the catheter body (1), and under the action of the negative pressure, the papillary end (31) moves backward and the S-shaped junction (32) extrudes outwards to touch the inner wall of the catheter body (1) to close the communication between the through hole (33) and the inside of the catheter body (1).

2. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: The catheter body (1) is connected to the injection head (2) through a sliding locking ring.

3. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: The suction cylinder (4) includes a cylinder body (41), a piston (42) and a piston rod (43); a connection port (44) is provided at the front end of the cylinder body (41); the connection port (44) is connected to the suction port (22); a notch (46) for locking the position is provided along the length direction of the piston rod (43); a rotatable flap (47) is provided at the rear end of the cylinder body (41); the rotatable flap (47) can interfere with the notch (46) to lock the position of the piston rod (43).

4. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: The catheter body (1) and the catheter head (3) are integrally formed and made of silicone rubber.

5. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: The papillary end (31) is round and blunt, and the maximum diameter is smaller than the outer diameter of the catheter body (1); the diameter range is 2.5 - 3.0 mm; it protrudes from the catheter body by 1.5 - 2.5 mm.

6. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: The overall length range of the S-shaped junction (32) including two bent parts is 10 - 15 mm.

7. A PICC tube capable of reducing maintenance requirements according to claim 1, characterized in that: Fixed wings (23) are unfolded outwards on the injection head (2) to facilitate fixing the injection head (2).

8. A method for peripherally inserted central venous catheterization, using the PICC tube as described, characterized in that, Including the following steps: S1. Preoperative preparation and catheter insertion: Sterile operation preparation: Operate in a sterile environment. Medical staff wear gloves and masks and prepare the required equipment, including a PICC catheter, an ultrasound instrument, a syringe, physiological saline and disinfection supplies; Select the puncture point under ultrasound guidance: Use ultrasound guidance to select a suitable vein and determine the insertion depth of the catheter; Venipuncture and catheter insertion: Use a puncture needle to puncture the vein. After confirming blood return, introduce the PICC catheter body (1); under ultrasound guidance, the catheter head (3) is gradually advanced to near the superior vena cava. At this time, the catheter head is in a normal state and the through hole (33) is open; S2. Inject the medicine solution: Empty the air before injection: Connect the syringe to the injection port (21) and ensure that all the air in the syringe is completely discharged until the liquid flows out of the syringe, empty all the air bubbles, check the connection port of the syringe to ensure good sealing and no air bubbles; Injecting drugs or normal saline: Slowly inject drugs or normal saline while maintaining a stable pushing force to reduce pressure fluctuations within the catheter; Use the "pulsed" injection method to create turbulent flow, which helps to remove residues on the inner wall of the catheter and ensure the smooth inflow of drugs into the patient's bloodstream; S3. Sealing the catheter: Flushing before sealing: Flush the catheter with normal saline to ensure that there is no residual drug solution or blood in the catheter; Slowly inject the normal saline using the pulsed injection method to remove blood or drug residues on the inner wall of the catheter; Connecting the aspiration device: Connect the connection port (44) of the aspiration syringe (4) to the aspiration port (22) to prepare for negative pressure operation; Negative pressure formation: By pulling the piston rod (43) of the aspiration syringe (4) outwards, aspirate the normal saline inside the catheter to form a negative pressure state; Under the action of negative pressure, the papillary end (31) of the catheter head (3) moves backward, and the S-shaped connection part (32) gradually compresses the inner wall of the catheter to seal the through hole (33), ensuring isolation between the inside of the catheter and the external blood vessel; S4. Aseptic sealing and fixation: Aseptic sealing treatment: After sealing the catheter, connect the end of the catheter to a needleless sealing device or a needleless injection cap to ensure good sealing at the end of the catheter and prevent air from entering the catheter; Cover the catheter insertion point with a sterile dressing to ensure an aseptic environment at the skin and catheter interface; Catheter fixation: Fix the catheter to the patient's skin using medical tape or a special fixation device to ensure that the catheter does not shift or get pulled during daily activities.

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