PICC (Peripherally Inserted Central Catheter) thrombolysis device

Abstract

The invention relates to the technical field of medical instruments, in particular to a PICC (peripherally inserted central catheter) thrombolysis device which comprises a connector and a catheter body, a first liquid cavity penetrating through the catheter body is arranged in the catheter body, the catheter body comprises a main tube section and a dosing tube section, and a wrapping component is arranged between the main tube section and the dosing tube section. The wrapping component comprises an isolating membrane sleeve and a traction rope, the isolating membrane sleeve has a first form and a second form, in the first form, the isolating membrane sleeve wraps the outer surface of the main tube section, the isolating membrane sleeve wraps the outer surface of the drug delivery tube section, and the isolating membrane sleeve forms the second form. The isolating membrane sleeve in the second form is used for covering the fibrous protein tail or the fibrous protein sheath formed at the end part of the catheter body, and further, the opening at the free end of the isolating membrane sleeve can be closed, so that the fibrous protein tail or the fibrous protein sheath can be dissolved in the closed accommodating cavity formed by the isolating membrane sleeve; and the fallen fibrin is effectively prevented from remaining in the superior vena cava of a human body.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a PICC catheter thrombolysis device. Background Art

[0002] Peripherally inserted central catheter (PICC) uses a catheter to puncture a vein in the arm. The catheter goes directly to the large vein close to the heart, avoiding direct contact between chemotherapy drugs and the arm vein. In addition, the blood flow in the large vein is very fast, which can quickly dilute the chemotherapy drugs and reduce the stimulation of the drugs on the blood vessels. In addition, PICC has the advantage of a long retention time, which can avoid repeated punctures and reduce the pain of patients.

[0003] During the indwelling of the PICC catheter, platelets and white blood cells gather at the tip of the catheter over time, gradually forming a fibrin tail or fibrin sheath. The presence of the fibrin tail or fibrin sheath will cause the diameter of the end of the PICC catheter to increase, thereby hindering the removal of the PICC catheter. In order to solve the above problems, heparin, urokinase, tissue plasminogen activator (TPA), sodium bicarbonate solution and other drugs are usually used clinically to dissolve the fibrin tail or fibrin sheath before the catheter is removed.

[0004] However, in the process of using drugs to dissolve the fibrin tail or fibrin sheath, a portion of the fibrin may fall off the PICC catheter and remain in the human superior vena cava, causing the body to have a series of serious complications such as pulmonary embolism, infection, and thrombosis. In addition, this part of the fibrin attached to the surface of the PICC catheter is difficult to fully contact with the dissolving drug, resulting in poor fibrinolysis effect, thereby further increasing the risk of venous damage to the human body during the removal of the PICC catheter.

[0005] Therefore, how to prevent fibrin from remaining in the superior vena cava of the human body during the process of using drugs to dissolve the fibrin tail or fibrin sheath is a technical problem that needs to be solved urgently in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a PICC catheter thrombolytic device to address the problem in the prior art that during the process of using drugs to dissolve the fibrin tail or fibrin sheath, a part of the fibrin may fall off the PICC catheter and remain in the superior vena cava of the human body, causing the body to develop a series of serious complications such as pulmonary embolism, infection, thrombosis, etc.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A PICC catheter thrombolytic device comprises a joint part and a catheter body, wherein the catheter body specifically comprises a liquid inlet end and a liquid outlet end, the joint part is arranged on the liquid inlet end of the catheter body, a first liquid cavity penetrating the catheter body is arranged inside the catheter body, and the joint part is communicated with the first liquid cavity; the catheter body comprises a main tube section and a drug delivery tube section, and the drug delivery tube section is used to extend into the superior vena cava of a human body; A wrapping component is arranged between the main tube section and the drug delivery tube section, and the wrapping component includes an isolation film sleeve and a pulling rope. One end of the isolation film sleeve is connected to the catheter body, and the other end is a free end. The pulling rope passes through the first liquid cavity from the liquid inlet end side of the catheter body and passes through the liquid outlet end side of the catheter body. The pulling rope is provided in two pieces. The end of the pulling rope located at the liquid outlet end of the catheter body is connected to the free end of the isolation membrane sleeve. The two pulling ropes are arranged on both sides of the isolation membrane sleeve opposite to each other. The ends of the two pulling ropes located at the liquid inlet end of the catheter body are connected to each other to form an integral structure. The isolation film sleeve has a first form and a second form. In the first form, the isolation film sleeve covers the outer surface of the main pipe section, and the outer surface of the isolation film sleeve is opposite to the outer surface of the main pipe section. When the isolation film sleeve changes from the first form to the second form, the pulling rope is pulled to apply tension to the isolation film sleeve, and under the action of the tension, the isolation film sleeve gradually slides toward the direction of the medication tube segment and flips, and finally the isolation film sleeve covers the outer surface of the medication tube segment, so that the inner surface of the isolation film sleeve is opposite to the outer surface of the medication tube segment, and the isolation film sleeve forms the second form, and the isolation film sleeve can cover the fibrin tail or fibrin sheath formed at the end of the catheter body in the second form.

[0008] Preferably, the isolation membrane sleeve includes a containing segment, a fixed segment and an elastic segment. When the isolation membrane sleeve is in the second form, the elastic segment corresponds to the area where the medication tube segment and the main tube segment meet, the containing segment corresponds to the area where a fibrin tail or a fibrin sheath is formed at the end of the medication tube segment, the fixed segment is arranged between the covering segment and the elastic segment, and the fixed segment is made of rubber material. When the isolation membrane sleeve is in the first form, the fixed segment can exert its own elastic contraction force on the main tube segment.

[0009] Preferably, the outer diameter of the drug delivery tube segment is smaller than the outer diameter of the main tube segment, and when the isolation membrane sleeve is in the second state, a gap is formed between the fixed segment and the drug delivery tube segment.

[0010] Preferably, a second liquid cavity is further provided in the main pipe section, and when the isolation membrane sleeve is in the first form, the elastic segment covers the liquid outlet of the second liquid cavity, and the elastic segment is made of elastic rubber material. Injecting physiological saline into the second liquid cavity can expand the elastic segment.

[0011] Preferably, the direction in which the physiological saline gushes out from the liquid outlet of the second liquid cavity is toward the medication tube segment.

[0012] Preferably, the liquid outlet of the second liquid cavity is arranged at the end where the main tube section and the drug delivery tube section meet, and the liquid outlet of the second liquid cavity is arranged as a circular ring structure.

[0013] Preferably, the medication tube segment is further provided with a guide hole, the guide hole is provided close to one side of the end of the medication tube segment, and the pulling rope passes through the guide hole.

[0014] Preferably, the diameter of the guide hole is larger than the diameter of the pulling rope.

[0015] Preferably, the central axis of the guide hole forms an acute angle with the central axis of one side of the end of the medication tube segment.

[0016] Preferably, the pulling rope is provided with identification sections composed of multiple colors, and the identification sections are arranged at intervals along the length direction of the pulling rope. The identification sections are used to identify the position of the free end of the isolation membrane sleeve relative to the end of the medication tube segment during the process of the isolation membrane sleeve changing from the first form to the second form.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A PICC catheter thrombolytic device according to the present invention can cover the fibrin tail or fibrin sheath formed at the end of the catheter body by forming a second-shaped isolation membrane sleeve. After the isolation membrane sleeve forms the second shape, the pulling rope is pulled to tighten it. Under the action of the pulling force, the free end of the isolation membrane sleeve can shrink and deform toward its central axis, so that the opening of the free end of the isolation membrane sleeve can be closed, ensuring that the fibrin tail or fibrin sheath can be completely dissolved in the closed accommodating cavity formed by the isolation membrane sleeve, effectively avoiding the detached fibrin remaining in the superior vena cava of the human body, and reducing the risk of complications caused by the residual fibrin after the PICC catheter is removed; and in this embodiment, the fibrin tail or fibrin sheath formed at the end of the catheter body is covered by the isolation membrane sleeve, so that the part of the fibrin attached to the surface of the catheter body can be fully contacted with the dissolving drug, thereby improving the dissolution speed and dissolution effect of the fibrin; 2. A PICC catheter thrombolytic device described in the present invention, wherein a second liquid cavity is also provided in the main tube section, and the isolation membrane sleeve is in the first form, and the elastic segment covers the liquid outlet of the second liquid cavity, and the elastic segment is made of elastic rubber material. The elastic segment can be expanded by injecting physiological saline into the second liquid cavity. With this structural setting, the drug delivery tube section can be separated from the human venous blood vessel wall, thereby preventing the drug delivery tube section from rubbing against the human superior vena cava blood vessel wall, and reducing the risk of damage to the human superior vena cava blood vessel wall during the retention of the PICC catheter; on the other hand, the elastic segment, in the expanded state, can clamp the connection between the human venous blood vessel and the superior vena cava, reducing the risk of accidental tube removal during the retention of the PICC catheter; at the same time, in this embodiment, if the PICC catheter is pulled by a strong external force during the retention period, the physiological saline in the elastic segment can also be quickly discharged through the matching gap between the fixed segment and the main tube section under the action of pressure, thereby reducing the risk of damage to the human venous blood vessel wall due to compression; 3. In the PICC catheter thrombolytic device described in the present invention, the direction in which the physiological saline gushes out from the second liquid cavity outlet is toward the medication tube segment. With this structural arrangement, when the isolation membrane sleeve changes from the first form to the second form, after pulling the pulling rope to move the free end of the isolation membrane sleeve to the end position of the medication tube segment, physiological saline is injected into the second liquid cavity, and the physiological saline water flow gushing out from the second liquid cavity outlet can push the curled free end of the isolation membrane sleeve to fully stretch it to form the second form; compared with the method of pulling the PICC catheter outside the body to stretch the free end of the isolation membrane sleeve in the present application, the convenience of operation is improved, and the risk of damaging the human venous blood vessel wall in the process of pulling the PICC catheter is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a PICC catheter thrombolytic device; Figure 2 is a schematic diagram of a cross-sectional structure of the isolation membrane sleeve in a first form; Figure 3 yes Figure 2 The structural diagram of A in the figure; Figure 4 is a schematic diagram of a cross-sectional structure of the isolation membrane sleeve in a second form; Figure 5 is a schematic diagram of the cross-sectional structure of pulling the pulling rope to close the free end of the isolation membrane sleeve; Figure 6 It is a schematic diagram of the cross-sectional structure of the elastic segment of the isolation membrane sleeve in an expanded state.

[0019] Markings in the figure: 1-connector, 2-catheter body, 3-first liquid cavity, 4-main tube section, 5-drug delivery tube section, 6-wrapping component, 7-isolation membrane sleeve, 8-pulling rope, 9-accommodating segment, 10-fixing segment, 11-elastic segment, 12-second liquid cavity, 13-guide hole. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0022] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] Example 1: Figures 1 to 5As shown, a PICC catheter thrombolytic device of the present invention comprises a joint part 1 and a catheter body 2, wherein the catheter body 2 specifically comprises a liquid inlet end and a liquid outlet end, wherein the joint part 1 is arranged on the liquid inlet end of the catheter body 2, wherein the catheter body 2 is provided with a first liquid cavity 3 penetrating the catheter body, wherein the joint part 1 is communicated with the first liquid cavity 3; wherein the catheter body 2 comprises a main tube section 4 and a drug delivery tube section 5, wherein the drug delivery tube section 5 is used to extend into the superior vena cava of a human body; A wrapping component 6 is provided between the main tube section 4 and the drug delivery tube section 5. The wrapping component 6 includes an isolation film sleeve 7 and a pulling rope 8. One end of the isolation film sleeve 7 is connected to the catheter body 2, and the other end is a free end. The pulling rope 8 passes through the first liquid cavity 3 from the liquid inlet side of the catheter body 2, and passes through the liquid outlet side of the catheter body 2. The pulling rope 8 is provided in two pieces, and the end of the pulling rope 8 located at the liquid outlet end of the catheter body 2 is connected to the free end of the isolation membrane sleeve 7, and the two pulling ropes 8 are relatively arranged on both sides of the isolation membrane sleeve 7, and the ends of the two pulling ropes 8 located at the liquid inlet end of the catheter body 2 are connected to each other to form an integral structure; The isolation film sleeve 7 has a first form and a second form. In the first form, the isolation film sleeve 7 covers the outer surface of the main pipe section 4, and the outer surface of the isolation film sleeve 7 is opposite to the outer surface of the main pipe section 4. When the isolation film sleeve 7 changes from the first form to the second form, the pulling rope 8 is pulled to apply tension to the isolation film sleeve 7. Under the action of the tension, the isolation film sleeve 7 gradually slides toward the direction of the medication tube segment 5 and flips. Finally, the isolation film sleeve 7 covers the outer surface of the medication tube segment 5, so that the inner surface of the isolation film sleeve 7 is opposite to the outer surface of the medication tube segment 5, and the isolation film sleeve 7 forms the second form. In the second form, the isolation film sleeve 7 can cover the fibrin tail or fibrin sheath formed at the end of the catheter body 2.

[0027] A PICC catheter thrombolytic device described in the present invention is used. By forming a second-shaped isolation membrane sleeve 7, the fibrin tail or fibrin sheath formed at the end of the catheter body 2 can be covered. After the isolation membrane sleeve 7 is further formed into the second shape, the pulling rope 8 is pulled to tighten it. Under the action of the tension, the free end of the isolation membrane sleeve 7 can shrink and deform toward its central axis, so that the opening of the free end of the isolation membrane sleeve 7 can be closed, ensuring that the fibrin tail or fibrin sheath can be completely dissolved in the closed accommodating cavity formed by the isolation membrane sleeve 7, effectively avoiding the detached fibrin remaining in the superior vena cava of the human body, and reducing the risk of complications caused by the residual fibrin after the PICC catheter is removed; and, in this embodiment, the fibrin tail or fibrin sheath formed at the end of the catheter body 2 is covered by the isolation membrane sleeve 7, so that the part of the fibrin attached to the surface of the catheter body 2 can be fully contacted with the dissolving drug, thereby improving the dissolution rate and dissolution effect of the fibrin.

[0028] Specifically, in the present embodiment, when the catheter placement operation is performed, the isolation membrane sleeve 7 is in the first form; the isolation membrane sleeve 7 is made of a medical plastic film or a medical rubber film, the diameter of the isolation membrane sleeve 7 is at least twice the diameter of the main tube section 4, and the softness of the isolation membrane sleeve 7 is greater than the softness of the catheter body 2, thereby preventing the tension applied by the pulling rope 8 on the isolation membrane sleeve 7 from being offset by the deformation of the catheter body 2 when the isolation membrane sleeve 7 is transformed from the first form to the second form; when the pulling rope 8 is pulled to transform the isolation membrane sleeve 7 from the first form to the second form, when the operator feels a significant increase in the pulling force, it can be judged that the free end of the isolation membrane sleeve 7 has moved to the end position of the drug delivery tube section 5, and the operator needs to release it at this time. The pulling rope 8 pulls the PICC catheter to move a certain distance outside the body, so that the isolation membrane sleeve 7 located at the end position of the drug delivery tube section 5 can generate friction with the human venous blood vessel wall, and the free end of the isolation membrane sleeve 7 can be fully stretched under the action of the friction force, and finally form a second form to be sleeved on the outside of the fibrin tail or fibrin sheath formed at the end of the catheter body 2; before injecting the dissolved drug into the first liquid cavity 3, the operator needs to pull the pulling rope 8 again to tighten it, and under the action of the tension, the free end of the isolation membrane sleeve 7 can shrink and deform toward its central axis, so that the opening of the free end of the isolation membrane sleeve 7 can be closed, ensuring that the fibrin tail or fibrin sheath can be completely dissolved in the closed accommodating cavity formed by the isolation membrane sleeve 7.

[0029] On the other hand, in actual use of this embodiment, after the operator tightens the pulling rope 8, the pulling rope 8 is used to make a circular motion around the first liquid cavity 3. The pulling rope 8 can cut the thrombus blocking the inside of the first liquid cavity 3, so that the thrombus blocking the first liquid cavity 3 is broken up, thereby realizing the unblocking operation of the first liquid cavity 3, thereby improving the practicality of the present invention in actual use.

[0030] Example 2: Figures 1 to 6 As shown, a PICC catheter thrombolytic device described in the present invention is based on the above method, and further, the isolation membrane sleeve 7 includes a containing segment 9, a fixed segment 10 and an elastic segment 11, and the isolation membrane sleeve 7 is in the second form. The elastic segment 11 corresponds to the area where the drug administration tube segment 5 and the main tube segment 4 meet, and the containing segment 9 corresponds to the area where the fibrin tail or fibrin sheath is formed at the end of the drug administration tube segment 5. The fixed segment 10 is arranged between the covering segment and the elastic segment 11, and the fixed segment 10 is made of rubber material. When the isolation membrane sleeve 7 is in the first form, the fixed segment 10 can exert its own elastic contraction force on the main tube segment 4.

[0031] In the present embodiment, considering that in the above-mentioned implementation manner, the diameter of the isolation membrane sleeve 7 is set to be at least twice the diameter of the main tube section 4, and the softness of the isolation membrane sleeve 7 is greater than the softness of the catheter body 2, such a structural setting, during the indwelling process of the PICC catheter, the isolation membrane in the first form is easy to accidentally transform into the second form under the impact of blood flow in the vein. The free end of the isolation membrane sleeve 7 in the second form will extend beyond the end of the drug delivery tube section 5. Under the impact of blood flow, the free end of the isolation membrane sleeve 7 will continuously rub against the human venous blood vessel wall, thereby causing the risk of damage to the human venous blood vessel wall. Based on this, in this embodiment, the fixed segment 10 is made of rubber material. When the isolation membrane sleeve 7 is in the first form, the fixed segment 10 can exert its own elastic contraction force on the main pipe segment 4. In this way, the isolation membrane sleeve 7 can be more stably fixed on the main pipe segment 4 in the first form, thereby preventing the isolation membrane sleeve 7 from accidentally transforming into the second form under the impact of blood during the indwelling of the PICC catheter, causing the isolation membrane sleeve 7 to rub against the human venous blood vessel wall, causing damage to the body's venous blood vessel wall, thereby further improving the practicality of the present invention in actual use.

[0032] As a preferred embodiment, based on the above manner, further, the outer diameter of the drug delivery tube segment 5 is smaller than the outer diameter of the main tube segment 4, and when the isolation membrane sleeve 7 is in the second form, a gap is formed between the fixed segment 10 and the drug delivery tube segment 5. With this arrangement, in the process of the isolation membrane sleeve 7 being transformed from the first form to the second form, the elastic contraction force of the fixed segment 10 itself can be prevented from acting on the drug delivery tube segment 5, thereby improving the smoothness of the transformation of the isolation membrane sleeve 7 from the first form to the second form, thereby further improving the practicality of the present invention in actual use.

[0033] As a preferred embodiment, based on the above method, further, a second liquid cavity 12 is provided in the main pipe section 4, and when the isolation membrane sleeve 7 is in the first form, the elastic segment 11 covers the liquid outlet of the second liquid cavity 12, and the elastic segment 11 is made of elastic rubber material. Injecting physiological saline into the second liquid cavity 12 can expand the elastic segment 11.

[0034] Specifically, in the present embodiment, during the indwelling process of the PICC catheter, physiological saline is injected into the second liquid cavity 12 to expand the elastic segment 11. When the elastic segment 11 is in an expanded state, the drug administration tube segment 5 can be separated from the human venous blood vessel wall, thereby preventing the drug administration tube segment 5 from rubbing against the human superior vena cava blood vessel wall, and reducing the risk of damage to the human superior vena cava blood vessel wall during the indwelling of the PICC catheter; on the other hand, when the elastic segment 11 is in an expanded state, it can clamp the connecting part between the human venous blood vessel and the superior vena cava, reducing the risk of accidental tube removal during the indwelling of the PICC catheter; at the same time, in the present embodiment, if the PICC catheter is pulled by a strong external force during the indwelling period, the physiological saline in the elastic segment 11 can also be quickly discharged through the matching gap between the fixed segment 10 and the main pipe segment 4 under the action of pressure, thereby reducing the risk of damage to the human venous blood vessel wall due to compression.

[0035] Example 3: Figure 3 As shown, the PICC catheter thrombolytic device described in the present invention is based on the above method, and further, the direction in which the physiological saline is sprayed out from the outlet of the second liquid cavity 12 is toward the drug delivery tube segment 5.

[0036] Specifically, in this embodiment, when the isolation membrane sleeve 7 is transformed from the first form to the second form, after pulling the pulling rope 8 to move the free end of the isolation membrane sleeve 7 to the end position of the drug administration tube segment 5, physiological saline is injected into the second liquid cavity 12, and the physiological saline water flow gushing out from the liquid outlet of the second liquid cavity 12 can push the curled free end of the isolation membrane sleeve 7 to fully stretch it to form the second form; compared with the method of pulling the PICC catheter outside the body to stretch the free end of the isolation membrane sleeve 7 in the present application, the convenience of operation is improved, and the risk of damaging the human venous blood vessel wall during pulling the PICC catheter is reduced.

[0037] As a preferred embodiment, on the basis of the above-mentioned method, further, the liquid outlet of the second liquid cavity 12 is arranged at the end where the main tube section 4 and the drug delivery tube section 5 meet, and the liquid outlet of the second liquid cavity 12 is arranged as a circular ring structure. With this structural arrangement, the uniformity of the physiological saline flowing out of the liquid outlet of the second liquid cavity 12 can be improved, so that the curled free end of the isolation membrane sleeve 7 can be quickly pushed by the water flow to stretch into the second form, further improving the practicality of the present invention in actual use. On the other hand, in this embodiment, the liquid outlet of the second liquid cavity 12 is arranged at the end where the main tube section 4 and the drug delivery tube section 5 meet, which can ensure the smoothness of the surface of the main tube section 4 and reduce the risk of damage to human veins during the PICC catheter removal operation.

[0038] Example 4: Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a PICC catheter thrombolytic device described in the present invention is based on the above method. Further, a guide hole 13 is provided on the drug administration tube segment 5. The guide hole 13 is provided on one side of the end of the drug administration tube segment 5, and the pulling rope 8 passes through the guide hole 13.

[0039] In this embodiment, the guide hole 13 is provided to better restrict the pull rope 8, preventing it from sliding along the edge of the end of the drug delivery tube segment 5 during the pulling process, thereby reducing the disturbance of the fibrin tail or fibrin sheath formed at the end of the catheter body 2 during the pulling process, thereby reducing the risk of fibrin falling off and remaining in the superior vena cava of the human body. At the same time, the guide hole 13 is used to restrict the pull rope 8 from sliding on the edge of the end of the drug delivery tube segment 5, and the loss of the pull rope 8 during the transmission of tension can also be reduced, thereby further improving the practicality of the present invention in actual use.

[0040] As a preferred embodiment, based on the above method, further, the diameter of the guide hole 13 is larger than the diameter of the pulling rope 8. With this structural setting, the friction force of the pulling rope 8 passing through the guide hole 13 can be reduced, and the smoothness of pulling the pulling rope 8 is improved. On the other hand, in this embodiment, when the fibrin tail or fibrin sheath formed at the end of the catheter body 2 blocks the liquid outlet of the drug delivery tube section 5, the guide hole 13 is also provided on the drug delivery tube section to ensure that the dissolved drug solution is filled in the closed accommodating cavity formed by the isolation membrane sleeve 7, thereby further improving the practicality of the present invention in actual use.

[0041] As a preferred embodiment, based on the above method, further, the central axis of the guide hole 13 forms an acute angle with the central axis of one side of the end of the drug delivery tube segment 5.

[0042] Example 5: Figures 1 to 6 As shown, a PICC catheter thrombolytic device described in the present invention is based on the above method, and further, the pulling rope 8 is provided with identification sections composed of multiple colors, and the identification sections are arranged at intervals along the length direction of the pulling rope 8. The identification sections are used to mark the position of the free end of the isolation membrane sleeve 7 relative to the end of the medication tube segment 5 during the process of the isolation membrane sleeve 7 changing from the first form to the second form.

[0043] Specifically, in the present embodiment, the pulling rope 8 is white, and the identification section is composed of three colors: red, black and yellow. The red identification section is arranged on the end side of the pulling rope 8 located at the liquid inlet end of the catheter body 2, and the black identification section is arranged between the red identification section and the yellow identification section. When the identification sections are all located inside the first liquid cavity 3, the isolation membrane sleeve 7 is in the first form, and when the yellow identification section is completely pulled out from the first liquid cavity 3, the isolation membrane sleeve 7 forms the second form. When the black identification section is completely exposed and the yellow identification section is not completely exposed, the free end of the isolation membrane sleeve 7 moves to the end of the drug delivery tube section 5 to form a curled state. With this structural arrangement, the operator can accurately judge the different forms of the isolation membrane sleeve 7 in the human body by the exposed identification sections of different colors, thereby further improving the practicality of the present invention in actual use. Moreover, in the present embodiment, after the elastic segment 11 is expanded, the pulling rope 8 is stretched straight and the length of the marking section exposed is observed, so as to judge the expansion degree of the elastic segment 11 or whether the expanded elastic segment 11 is deflated, thereby further improving the practicality of the present invention in actual use.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PICC catheter thrombolytic device, characterized in that: The invention comprises a joint part and a catheter body, wherein the catheter body specifically comprises a liquid inlet end and a liquid outlet end, the joint part is arranged on the liquid inlet end of the catheter body, a first liquid cavity penetrating the catheter body is arranged inside the catheter body, and the joint part is communicated with the first liquid cavity; the catheter body comprises a main tube section and a drug delivery tube section, and the drug delivery tube section is used to extend into the superior vena cava of a human body; A wrapping component is arranged between the main tube section and the drug delivery tube section, and the wrapping component includes an isolation film sleeve and a pulling rope. One end of the isolation film sleeve is connected to the catheter body, and the other end is a free end. The pulling rope passes through the first liquid cavity from the liquid inlet end side of the catheter body and passes through the liquid outlet end side of the catheter body. The pulling rope is provided in two pieces. The end of the pulling rope located at the liquid outlet end of the catheter body is connected to the free end of the isolation membrane sleeve. The two pulling ropes are arranged on both sides of the isolation membrane sleeve opposite to each other. The ends of the two pulling ropes located at the liquid inlet end of the catheter body are connected to each other to form an integral structure. The isolation film sleeve has a first form and a second form. In the first form, the isolation film sleeve covers the outer surface of the main pipe section, and the outer surface of the isolation film sleeve is opposite to the outer surface of the main pipe section. When the isolation film sleeve changes from the first form to the second form, the pulling rope is pulled to apply tension to the isolation film sleeve, and under the action of the tension, the isolation film sleeve gradually slides toward the direction of the medication tube segment and flips, and finally the isolation film sleeve covers the outer surface of the medication tube segment, so that the inner surface of the isolation film sleeve is opposite to the outer surface of the medication tube segment, and the isolation film sleeve forms the second form, and the isolation film sleeve can cover the fibrin tail or fibrin sheath formed at the end of the catheter body in the second form.

2. The PICC catheter thrombolytic device according to claim 1, characterized in that: The isolation membrane sleeve includes a containing segment, a fixed segment and an elastic segment. When the isolation membrane sleeve is in the second form, the elastic segment corresponds to the area where the medication tube segment and the main tube segment meet, the containing segment corresponds to the area where the fibrin tail or fibrin sheath is formed at the end of the medication tube segment, the fixed segment is arranged between the covering segment and the elastic segment, and the fixed segment is made of rubber material. When the isolation membrane sleeve is in the first form, the fixed segment can exert its own elastic contraction force on the main tube segment.

3. The PICC catheter thrombolytic device according to claim 2, characterized in that: The outer diameter of the drug delivery tube section is smaller than the outer diameter of the main tube section, and when the isolation membrane sleeve is in the second state, a gap is formed between the fixing section and the drug delivery tube section.

4. The PICC catheter thrombolytic device according to claim 3, characterized in that: A second liquid cavity is also provided in the main pipe section. When the isolation membrane sleeve is in the first form, the elastic segment covers the liquid outlet of the second liquid cavity. The elastic segment is made of elastic rubber material. Injecting physiological saline into the second liquid cavity can expand the elastic segment.

5. The PICC catheter thrombolytic device according to claim 4, characterized in that: The direction in which the physiological saline gushes out from the liquid outlet of the second liquid cavity is toward the drug delivery tube segment.

6. The PICC catheter thrombolytic device according to claim 5, characterized in that: The liquid outlet of the second liquid cavity is arranged at the end where the main tube section and the drug delivery tube section meet, and the liquid outlet of the second liquid cavity is arranged as a circular ring structure.

7. The PICC catheter thrombolytic device according to any one of claims 1 to 6, characterized in that: The medication tube section is also provided with a guide hole, which is provided on one side of the end of the medication tube section, and the pulling rope passes through the guide hole.

8. The PICC catheter thrombolytic device according to claim 7, characterized in that: The diameter of the guide hole is larger than the diameter of the pulling rope.

9. The PICC catheter thrombolytic device according to claim 8, characterized in that: The central axis of the guide hole forms an acute angle with the central axis of one side of the end of the drug delivery tube segment.

10. The PICC catheter thrombolytic device according to claim 1, characterized in that: The pulling rope is provided with marking sections composed of multiple colors, and the marking sections are arranged at intervals along the length direction of the pulling rope. The marking sections are used to mark the position of the free end of the isolation membrane sleeve relative to the end of the medication tube segment when the isolation membrane sleeve changes from the first form to the second form.

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