Double-cavity perfusion catheter
By designing the inner and outer tube structure of the double-lumen perfusion catheter and an adjustable end cap, the problem of cumbersome operation of existing catheters in tortuous blood vessels is solved, achieving the effects of simplified surgery and reduced costs, and is suitable for peripheral vascular thrombolytic therapy.
Patent Information
- Application Number
- CN202422858663.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Existing perfusion catheters are cumbersome to insert into curved blood vessels, and require the use of occlusion guidewires, which increases resistance and difficulty.
A dual-lumen perfusion catheter is designed, employing an inner and outer tube structure. The outer tube surface has holes, and it is combined with an adjustable end cap and occlusion wire to simplify operation and eliminate the need for a hemostatic valve and occlusion guide wire.
It simplifies surgical procedures, reduces production costs, improves ease of operation and occlusion stability, and is suitable for peripheral vascular thrombolytic therapy.
Smart Images
Figure CN223716196U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical equipment technical field, concretely relates to catheter technical field, especially a kind of double-lumen perfusion catheter. BACKGROUND
[0002] Lower extremity deep vein thrombosis is a common clinical disease and frequently-occurring disease, which can cause swelling of the affected limb, leg function disorder, and even life-threatening complications such as pulmonary embolism, and the latter has a high mortality rate. At present, one of the common treatment methods for lower extremity deep vein thrombosis is catheter thrombolysis, that is, a perfusion catheter is introduced to administer thrombolytic drugs such as urokinase for drug thrombolysis treatment.
[0003] A common perfusion catheter is generally composed of a catheter and a blocking guide wire. The distal section of the catheter is designed as a perfusion section, and the catheter outside the perfusion section is designed with holes. At the same time, corresponding hemostatic valves, syringes and other components are provided for use together. During the operation, the blood vessel sheath is first inserted, and the instrument is prepared and the peripheral vascular thrombus state is confirmed. Then, under the cooperation of the guide wire, the perfusion catheter is guided along the blood vessel to the thrombus position, and the perfusion section covers the position of the thrombus section. Then, the thrombolytic liquid is injected, and flows out to the blood vessel lesion position through the holes of the perfusion section to achieve the purpose of thrombolysis treatment. The operation of such an instrument is relatively complicated during the operation. At the same time, since the blocking guide wire is needed to block the head end of the catheter, there is a great resistance in the process of inserting the blocking guide wire into the blood vessel after the catheter is inserted into the blood vessel, especially when the catheter is inserted into a relatively curved blood vessel, which increases the difficulty. SUMMARY
[0004] The utility model aims at providing a kind of double-lumen perfusion catheter, suitable for such as for peripheral vascular thrombolysis treatment.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that
[0006] A double-lumen perfusion catheter, comprising:
[0007] A catheter body comprising an outer tube and an inner tube, the inner tube is arranged in the outer tube, an inner lumen is formed in the inner tube, the distal end of the inner lumen penetrates the distal end of the inner tube, an outer lumen is formed between the inner tube and the outer tube, the distal end of the outer lumen is blocked, the outer tube has a perfusion section, a first hole is formed on the surface of the outer tube between the perfusion sections, the first hole is connected to the outer lumen, a second hole is formed on the proximal end of the inner tube, the second hole is connected to the outer lumen and the inner lumen;
[0008] The catheter seat is connected to the proximal end of the catheter body, and the catheter seat is provided with a first connecting port and a second connecting port.
[0009] The end cap can be connected to the first connecting port or the second connecting port, and the end cap has a first sealing state and a second sealing state. In the first sealing state, the end cap only seals the first connecting port or the second connecting port. In the second sealing state, the end cap simultaneously seals the first connecting port or the second connecting port and the second hole.
[0010] The above technical solution preferably comprises a first end cap, a second end cap and a sealing wire. One end of the sealing wire is connected to the second end cap, and the other end of the sealing wire passes through the first end cap. In the first sealing state, the first end cap seals the first connecting port or the second connecting port, and the sealing wire passes through the first connecting port or the second connecting port. In the second sealing state, the first end cap seals the first connecting port, and the sealing wire seals the second hole.
[0011] Further preferably, the first end cap and the first connecting port or the second connecting port are connected by threads.
[0012] The second end cap and the first end cap are connected by threads, and the threads adjust the second end cap and the first end cap to switch between the first sealing state and the second sealing state. The threaded connection is simple in structure and easy to operate, and facilitates switching between the two sealing states during surgery.
[0013] Further preferably, among the first connecting port or the second connecting port and one end of the first end cap, one is an outer conical luer joint, and the other is an inner conical luer joint.
[0014] Among the other end of the first end cap and the second end cap, one is an outer conical luer joint, and the other is an inner conical luer joint.
[0015] On the one hand, the luer joint can standardize the structure of the end cap, the first connecting port and the second connecting port, and on the other hand, the luer joint has a locking structure to ensure the stability of the sealing.
[0016] Further preferably, the first end cap is provided with a third hole, the sealing wire passes through the third hole, and one or more sealing rings are arranged in the third hole. The sealing ring can play a lubricating and buffering role, and can also seal to prevent the drug solution in the inner tube from flowing out.
[0017] Preferably, in the above technical solution, the single-sided gap between the inner tube and the outer tube is 0.2 to 0.7 mm. If the single-sided gap between the inner tube and the outer tube is too small, the resistance of the liquid medicine will be too large, and it will not be able to flow out smoothly; if the single-sided gap between the inner tube and the outer tube is too large, the outer diameter of the entire catheter body will be too large, increasing its volume.
[0018] Preferably, in the above technical solution, the catheter body further includes a stress relief tube, which is disposed between the catheter seat and the outer tube. The connection between the catheter seat and the catheter body is easy to bend, and the stress relief tube can release stress and buffer and protect the catheter body when bending.
[0019] Preferably, in the above technical solution, the outer tube and the inner tube are coaxially arranged.
[0020] Preferably, in the above technical solution, the first connection port and the inner cavity are coaxially arranged to facilitate the passage of the guide wire.
[0021] Preferably, in the above technical solution, the first hole is distributed in a single spiral shape on the surface of the outer tube, or the first hole is distributed in a double spiral shape on the surface of the outer tube.
[0022] Preferably, in the above-mentioned technical solution, the catheter further includes a contrast ring, which is disposed on the outer surface of the outer tube and located at at least one end of the infusion section.
[0023] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0024] This invention, through the design of the end cap, eliminates the need for components such as hemostatic valves and sealing guide wires compared to conventional irrigation catheters, making surgical operations simpler, reducing the burden on both doctors and patients, and meeting the diverse needs of clinical use; at the same time, the overall structure of the double-lumen catheter itself is simple, which can reduce production costs. Attached Figure Description
[0025] Appendix Figure 1 This is a cross-sectional schematic diagram of the conduit in this utility model;
[0026] Appendix Figure 2 This is a cross-sectional schematic diagram of the middle cap of this utility model in the first sealing state;
[0027] Appendix Figure 3 This is a cross-sectional schematic diagram of the middle cap of this utility model in the second sealing state;
[0028] Appendix Figure 4 This is a schematic diagram showing that the first hole in this utility model is distributed in a single spiral shape;
[0029] Appendix Figure 5 This is a schematic diagram showing that the first hole in this utility model is distributed in a double helix shape.
[0030] In the attached diagrams above:
[0031] 1. Catheter body; 10. Outer tube; 100. External cavity; 101. First orifice; 11. Inner tube; 110. Internal cavity; 111. Second orifice; 12. Stress relief tube;
[0032] 2. Conduit base; 20. First connection port; 21. Second connection port;
[0033] 3. End cap; 30. First end cap; 300. Third hole; 31. Second end cap; 32. Sealing thread; 33. Sealing ring;
[0034] 4. Development ring. Detailed Implementation
[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] like Figure 1 The illustrated dual-lumen irrigation catheter includes a catheter body 1, a catheter seat 2, and an end cap 3. Specifically:
[0038] The overall structure of the catheter body 1 is a coaxial double catheter double lumen structure, specifically including an outer tube 10 and an inner tube 11. The outer tube 10 and the inner tube 11 can be made of polymer materials, such as common materials like nylon (PA) and Pebax.
[0039] The inner tube 11 is arranged in the outer tube 10, and an inner cavity 110 is formed in the inner tube 11. The distal end of the inner cavity 110 penetrates the distal end of the inner tube 11, and the inner cavity 110 is used for penetrating the guide wire and injecting the drug solution.
[0040] An outer cavity 100 is formed between the inner tube 11 and the outer tube 10, and the distal end of the outer cavity 100 is sealed, for example, by heat fusion of the distal ends of the inner and outer tubes or by other filling tube sealing methods. The outer cavity 100 is mainly used for injecting thrombolytic drug solution. To ensure that the outer cavity 100 can smoothly inject the drug solution, the single-sided gap between the inner tube 11 and the outer tube 10 is not less than 0.2 mm, such as 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc. If the single-sided gap between the inner tube 11 and the outer tube 10 is too small, the resistance of the drug solution will be too large, and the drug solution cannot flow out smoothly. If the single-sided gap between the inner tube 11 and the outer tube 10 is too large, the overall outer diameter of the catheter body will be too large, increasing the volume thereof. In the present embodiment, the outer tube 10 and the inner tube 11 are coaxially arranged, which also makes the outer cavity 100 a cavity with uniform single-sided gap.
[0041] The outer tube 10 has a perfusion section, and a first hole 101 is formed in the surface of the outer tube 10 between the perfusion sections. The first hole 101 communicates with the outer cavity 100. The first hole 101 can be laser drilling or mechanical cutting, and can be a side hole or a cut seam. The first hole 101 can be arranged in a single helix on the surface of the outer tube 10, as shown in FIG. 1, or arranged in a double helix on the surface of the outer tube 10. Figure 4 After the thrombolytic drug solution is injected into the outer cavity 100, the drug solution can be sprayed or flowed out of the first hole 101 through the perfusion section to achieve the purpose of thrombolysis.
[0042] In the present embodiment, a second hole 111 is formed in the proximal end of the inner tube 11, and the second hole 111 communicates with the outer cavity 100 and the inner cavity 110.
[0043] In addition, the catheter also includes a developing ring 4 arranged on the outer surface of the outer tube 10 and located at least one end of the perfusion section. Typically, the developing ring 4 is arranged at both ends of the perfusion section to mark the position.
[0044] The catheter seat 2 is connected to the proximal end of the catheter body 1. In the present embodiment, the first connection port 20 and the second connection port 21 are arranged on the catheter seat 2. The first connection port 20 communicates with the inner cavity 110, and the first connection port 20 and the inner cavity 110 are coaxially arranged to facilitate the guide wire to pass through. The second connection port 21 communicates with the outer cavity 100. That is, the first connection port 20 is arranged in the middle of the catheter seat 2, and the first connection port 20 is arranged on the side of the catheter seat 2. The connection ports of the entire catheter seat 2 are in a Y-shaped structure.
[0045] In addition, the catheter body 1 further comprises a stress release tube 12 arranged between the catheter seat 2 and the outer tube 10. Since the connection position of the catheter seat 2 with the catheter body 1 is prone to bending, the stress release tube 12 can release stress when bending and buffer and protect the catheter body 1.
[0046] The end cap 3 is used for cooperating with and plugging the connecting port of the catheter seat 2 and can plug the inner lumen 110 of the inner tube 11 to prevent blood outflow when treating thrombus. Since the proximal end of the inner tube 11 is provided with the second hole 111 communicating the outer lumen 100 and the inner lumen 110 in the embodiment, the end cap 3 needs to plug the second hole 111 in addition to plugging the connecting port, that is, the end cap 3 has a first plugging state and a second plugging state. In the first plugging state, the end cap 3 only plugs the first connecting port 20 or the second connecting port 21. In the second plugging state, the end cap 3 plugs the first connecting port 20 or the second connecting port 21 and the second hole 111 simultaneously.
[0047] In the embodiment, the end cap 3 comprises a first end cap 30, a second end cap 31 and a plugging wire 32. One end of the plugging wire 32 is connected with the second end cap 31 and the other end of the plugging wire 32 penetrates through the first end cap 30. Specifically, the first end cap 30 is provided with a third hole 300, and the plugging wire 32 penetrates through the third hole 300. One or more sealing rings 33 are arranged in the third hole 300. The sealing rings 33 can play the roles of lubrication and buffering and can also seal to prevent the drug solution in the inner tube 11 from flowing out.
[0048] In this way, in the first plugging state, the first end cap 30 plugs the first connecting port 20 or the second connecting port 21, and the plugging wire 32 penetrates into the first connecting port 20 or the second connecting port 21, as shown in FIG. 4, taking the first connecting port 20 as an example. Figure 2 Figure 2 In the second plugging state, the first end cap 30 plugs the first connecting port 20 or the second connecting port 21, and the plugging wire 32 plugs the second hole 111 at the same time, as shown in FIG. 5. Figure 3
[0049] In the embodiment, the first end cap 30 is connected with the first connecting port 20 or the second connecting port 21 through threads, and the second end cap 31 is connected with the first end cap 30 through threads. The threads adjust the second end cap 31 and the first end cap 30 to switch between the first plugging state and the second plugging state. The threaded connection has the advantages of simple structure and convenient operation and is convenient for switching between the two plugging states during surgery.
[0050] Further, among the two of the first connection port 20 or the second connection port 21, one end of the first end cap 30: one is an outer conical luer connector, and the other is an inner conical luer connector. In the illustration: the first connection port 20 or the second connection port 21 is an inner conical luer connector, and one end of the first end cap 30 is an outer conical luer connector. Among the two of the other end of the first end cap 30, the second end cap 31: one is an outer conical luer connector, and the other is an inner conical luer connector. In the illustration: the other end of the first end cap 30 is an inner conical luer connector, and the second end cap 31 is an outer conical luer connector. On the one hand, the luer connector can standardize the structure of the end cap and the first connection port. On the other hand, the luer connector has a locking structure, which can ensure the stability of the plugging.
[0051] The use method of the catheter of the present embodiment is specifically described as follows:
[0052] First, puncture the sheath, and guide the guide wire into the blood vessel through the puncture sheath,
[0053] After the perfusion catheter is flushed, the second connection port 21 and the second hole 111 are plugged with the end cap 3, and then the perfusion catheter is pushed into the blood vessel along the guide wire through the inner lumen 110. Under X-ray imaging, the position of the developing ring 4 is observed until the two developing rings 4 are located at both ends of the thrombus of the diseased blood vessel. Then, the guide wire is withdrawn,
[0054] After the appropriate amount of drug for preventing thrombosis is injected into the first connection port 20 by using a syringe, the drug enters the blood vessel from the distal end of the inner lumen 110. Then, the end cap 3 is removed to plug the first connection port 20,
[0055] Prepare the thrombolytic drug solution needed for perfusion with the perfusion device, and connect the perfusion device, such as a syringe or other perfusion device, to the second connection port 21. Inject the thrombolytic drug into the outer lumen 100. The drug flows out of the first hole 101 into the blood vessel and contacts the thrombus to start dissolving the thrombus. At this time, the second end cap 30 can be adjusted to plug the second hole 111 with the plugging wire 32, or not to plug the second hole 111. When plugged, perfusion is only performed through the outer lumen 100 and the first hole 101. When not plugged, perfusion can be performed through the outer lumen 100, the first hole 101, or the inner lumen 110,
[0056] After the thrombolytic therapy is completed, the perfusion catheter is withdrawn.
[0057] In addition, if imaging is needed, in addition to the above-mentioned connection of the perfusion device to the second connection port 21 for perfusion of the contrast agent through the outer lumen 100 and the first hole 101, the perfusion device can also be connected to the first connection port 20 for perfusion of the contrast agent through the inner lumen 110, or the end cap 3 can be used for adjusting the perfusion.
[0058] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.
Claims
1. A dual lumen perfusion catheter, characterized by: The catheter comprises: a catheter body, which comprises an outer tube and an inner tube, the inner tube is arranged in the outer tube, an inner lumen is formed in the inner tube, the distal end of the inner lumen penetrates the distal end of the inner tube, an outer lumen is formed between the inner tube and the outer tube, the distal end of the outer lumen is blocked, the outer tube has a perfusion section, a first hole is arranged on the surface of the outer tube between the perfusion sections, the first hole is connected with the outer lumen, a second hole is arranged on the proximal end of the inner tube, the second hole is connected with the outer lumen and the inner lumen; a catheter seat, which is connected with the proximal end of the catheter body, the catheter seat is provided with a first connecting port and a second connecting port, the first connecting port is connected with the inner lumen, and the second connecting port is connected with the outer lumen; an end cap, which is connected with the first connecting port or the second connecting port, the end cap has a first blocking state and a second blocking state, in the first blocking state, the end cap only blocks the first connecting port or the second connecting port, and in the second blocking state, the end cap blocks the first connecting port or the second connecting port and the second hole at the same time.
2. The dual lumen perfusion catheter of claim 1, wherein: The end cap comprises a first end cap, a second end cap and a blocking wire, one end of the blocking wire is connected with the second end cap, the other end of the blocking wire penetrates the first end cap, in the first blocking state, the first end cap blocks the first connecting port or the second connecting port, and the blocking wire penetrates the first connecting port or the second connecting port, in the second blocking state, the first end cap blocks the first connecting port or the second connecting port, and the blocking wire blocks the second hole at the same time.
3. The dual lumen perfusion catheter of claim 2, wherein: The first end cap and the first connecting port or the second connecting port are connected through threads, the second end cap and the first end cap are connected through threads, and the threads adjust the second end cap and the first end cap to switch between the first blocking state and the second blocking state.
4. The dual lumen perfusion catheter of claim 2 or 3, wherein: One of the first connecting port or the second connecting port and one end of the first end cap is an outer conical luer joint, and the other is an inner conical luer joint. The other end of the first end cap and the second end cap are an outer conical luer joint and an inner conical luer joint respectively.
5. The dual lumen perfusion catheter of claim 2, wherein: The first end cap is provided with a third hole, the blocking wire penetrates the third hole, and one or more sealing rings are arranged in the third hole.
6. The dual lumen perfusion catheter of claim 1, wherein: The single-sided gap between the inner tube and the outer tube is 0.2-0.7 mm.
7. The dual lumen perfusion catheter of claim 1, wherein: The catheter body further comprises a stress release tube, which is arranged between the catheter seat and the outer tube.
8. The dual lumen perfusion catheter of claim 1, wherein: The outer tube and the inner tube are coaxially arranged; and / or The first connecting port and the inner lumen are coaxially arranged.
9. The dual lumen perfusion catheter of claim 1, wherein: The first holes are arranged in a single helix on the surface of the outer tube, or the first holes are arranged in a double helix on the surface of the outer tube.
10. The dual lumen perfusion catheter of claim 1, wherein: The catheter further comprises a developing ring, which is arranged on the outer surface of the outer tube and located at least one end of the perfusion section.