Negative pressure drainage type thermal ablation catheter
By introducing negative pressure drainage function into the thermal ablation catheter, the problems of uneven heating effects and thrombosis in the prior art are solved, and more efficient and safe varicose veins treatment are achieved.
Patent Information
- Application Number
- CN202323238656.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-11-29
AI Technical Summary
When treating varicose veins, the existing thermal ablation catheters have caused uneven heating effects due to the blood hindering the direct contact between the heating body and the blood vessel wall, which can easily lead to re-enrollment, varicose veins recurrence and thrombophitis.
A negative pressure drainage thermal ablation catheter is designed. By setting a negative pressure drainage hole and drainage joint at the front end of the catheter, the negative pressure drainage device is used to extract the stagnant blood in the vein, so that the blood vessel wall is close to the heating body, ensuring that the heating body and blood vessels are The wall is in close contact, and the blood vessel wall is uniformly heated by microwave, radio frequency or laser heating technology.
It significantly reduces the probability of thrombosis and thrombophlebitis, improves the treatment effect, ensures the consistency of vascular wall inactivation, and reduces the risk of varicose veins recurrence.
Smart Images
Figure CN222130231U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of medical devices, in particular to a negative pressure drainage type thermal ablation catheter. Background Art
[0002] We know that varicose veins are a common disease, which refers to the tortuosity and dilation of veins due to factors such as blood stasis and weak vein walls. At present, the treatment of varicose veins is mainly open surgery. The use of minimally invasive surgical methods such as thermal ablation and sclerosing agents to treat varicose veins has only been gradually carried out in recent years and is still in its infancy. Thermal ablation technology mainly uses lasers, microwaves, radio frequencies and other methods to locally heat the blood vessel walls of the diseased area, causing the varicose veins to contract and aseptically necrotize, and the treatment purpose of sealing the blood vessels is achieved by destroying the blood vessels. The existing thermal ablation catheter that can be used to treat varicose veins includes a flexible insertion catheter and a heating body. The heating body can be any one of the front section of the varicose vein microwave ablation catheter that releases microwave energy, the front section of the varicose vein radiofrequency ablation catheter that releases energy, and the front section of the varicose vein laser fiber that releases energy. The heating body is arranged at the front end of the insertion catheter, and a heating cable connected to the heating body is provided in the insertion catheter; for example, the State Intellectual Property Office disclosed on August 24, 2021 a utility model patent entitled: A flexible vascular ablation catheter, patent number: CN202022302025.0, which records the above-mentioned main technical features of the existing thermal ablation catheter.
[0003] During the use of the existing thermal ablation catheter for treating varicose veins, the heating body placed at the front end of the catheter is inserted into the varicose vein cavity to the varicose vein lesion. The heating body releases energy and heats the varicose vein lesion, causing the vascular protein to denature, lose activity and transform into fiber strands that are finally absorbed by the human body, thereby achieving the purpose of treating varicose veins. During this process, the heating body is controlled to continuously move backward at the varicose vein lesion by placing the catheter to complete the treatment of the varicose vein segment. During the treatment process of the existing thermal ablation catheter, due to the presence of a large amount of blood in the varicose vein cavity, the vascular wall at the varicose vein is far away from the heating body (with blood isolation), and the distance between the vascular wall and the heater is different. After the heating body heats the vascular wall, the heating effect is uneven, and the consistency of the vascular wall losing activity is poor, which is prone to recanalization and varicose vein recurrence; at the same time, the blood stagnant in the varicose vein is heated by the heating body, necrosed and scabbed, and stagnated in the varicose vein cavity after contraction, which is prone to thrombosis and thrombophlebitis, and is prone to induce other diseases. Summary of the invention
[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a negative pressure drainage thermal ablation catheter with a simple structure and convenient operation, which can discharge the stagnant blood in the varicose veins and perform thermal ablation treatment at the same time. The heating body is in close contact with the blood vessel wall, and the energy acts directly on the blood vessel wall of the varicose vein without passing through the blood, thereby greatly reducing the probability of thrombosis and thrombophlebitis and having an excellent treatment effect.
[0005] The technical solution adopted by the utility model to solve the above-mentioned deficiencies of the prior art is:
[0006] A negative pressure drainage thermal ablation catheter comprises a flexible insertion catheter, a heating body and a heating cable, wherein the heating body is arranged at the front of the insertion catheter, the heating cable is arranged in the insertion catheter, the front end of the heating cable is connected to the heating body, and the rear end is provided with a connector. The invention is characterized in that a negative pressure drainage hole is provided on the insertion catheter at the heating body, and a drainage connector for connecting to a negative pressure drainage device is provided at the rear end of the insertion catheter.
[0007] The rear part of the insertion catheter in the utility model is provided with a control handle, the insertion catheter passes through the control handle from front to back, and the drainage joint is arranged on the insertion catheter at the rear side of the control handle via the connecting catheter.
[0008] The heating body described in the utility model is any one of a microwave ablation catheter, a radiofrequency ablation catheter and a laser fiber heating head section. The heating body can be any temperature-controllable heat source that can heat the blood vessel wall outside the heating body, destroy the blood vessel activity and seal it.
[0009] The heating body described in the utility model is a ring laser optical fiber, the heating cable is an optical cable, the rear end of the insertion catheter is sealed and connected to the optical cable, and the connector is an optical connector.
[0010] A first negative pressure drainage hole is provided on the upper side wall of the insertion catheter at the rear side of the ring laser optical fiber described in the utility model, the diameter of the optical cable is smaller than the diameter of the insertion catheter, and the gap between the front end of the insertion catheter and the optical cable is the second negative pressure drainage hole.
[0011] The heating body described in the utility model includes a radiofrequency ablation electrode, an electrode mounting tube and an outer protective layer. The radiofrequency ablation electrode is in the shape of a spiral spring. The rear end of the electrode mounting tube is fixedly mounted on the front end of the insertion catheter. The radiofrequency ablation electrode is sleeved on the outside of the electrode mounting tube, and the electrode mounting tube is connected to the insertion catheter. The outer protective layer is sleeved on the outside of the radiofrequency ablation electrode. The front part of the outer protective layer is fixedly connected to the electrode mounting tube, and the rear part is fixedly connected to the front outer side of the insertion catheter. The heating cable is a wire. The protective layer is a jacket made of Teflon material or sprayed with Teflon coating.
[0012] The insertion catheter described in the utility model has a wire installation cavity in the side wall, the wire is arranged in the wire installation cavity, the front end of the wire is fixedly connected to the radiofrequency ablation electrode, and the rear end of the wire passes through the outer wall of the wire installation cavity and is connected to the radiofrequency connector; the rear end of the insertion catheter is provided with a drainage wire connector. The drainage wire connector is a Luer connector.
[0013] The varicose vein radiofrequency ablation catheter described in the utility model has a first negative pressure drainage hole on the upper side wall of the insertion catheter at the rear side of the heating end, and the front end of the electrode installation tube (connected with the insertion catheter) is a second pressure drainage hole. Negative pressure drainage can be performed simultaneously in front and behind the heating body, so that the blood vessel wall outside the heating body is fully in contact with the outer surface of the heating body, and the treatment effect is better.
[0014] The negative pressure drainage device described in the utility model is any one of a syringe, a negative pressure drainage ball or a negative pressure aspirator.
[0015] When the utility model is used, the drainage joint is connected to the negative pressure drainage device, and the connector is connected to the heat source, which is a radio frequency power supply, a laser light source or a microwave power supply. The heating body is inserted into the varicose veins along the vein by inserting a catheter, and the negative pressure drainage device works to draw out the blood accumulated in the varicose veins, so that the venous blood vessel wall of the varicose veins is close to or against the heating body; the heat source works and the heating body heats the blood vessel wall, so that the blood vessel wall loses activity and is sealed. Because the side wall of the blood vessel is close to or against the outside of the heating body, the blood vessel wall is heated evenly, and the consistency of the inactivation of the blood vessel wall is high, and it is not easy to have recanalization, recurrence of varicose veins, etc., and it is not easy to form thrombosis and thrombophlebitis. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 yes Figure 1 A partial enlarged view of point A.
[0018] Figure 3 It is another structural schematic diagram of the utility model.
[0019] Figure 4 This is a partial enlarged view of point B in 3.
[0020] Figure 5 yes Figure 3 A partial enlarged view of point C. DETAILED DESCRIPTION
[0021] Example 1
[0022] like Figure 1 , Figure 2The negative pressure drainage thermal ablation catheter shown includes a flexible insertion catheter 3, a heating body 5 and a heating cable. The heating body 5 includes a radiofrequency ablation electrode 52, an electrode mounting tube 51 and an outer protective layer 53. The radiofrequency ablation electrode 52 is in the shape of a coil spring. The rear end of the electrode mounting tube 51 is fixedly mounted on the front end of the insertion catheter 3. The radiofrequency ablation electrode 52 is sleeved on the outside of the electrode mounting tube 51. The electrode mounting tube 51 is connected to the insertion catheter 3, and the front end of the electrode mounting tube is a second pressure drainage hole. The outer protective layer 53 is sleeved on the outside of the radiofrequency ablation electrode 52. The front part of the outer protective layer 53 is fixedly connected to the electrode mounting tube 51, and the rear part is fixedly connected to the outside of the front end of the insertion catheter 3. A first negative pressure drainage hole 4 is provided on the insertion catheter 3 on the rear side of the heating body 5. The heating cable is a conductor 6. The outer protective layer 53 is a jacket made of Teflon material or sprayed with Teflon coating. Figure 2 It can be seen that a wire installation cavity is provided in the side wall of the insertion catheter 3, and the wire 6 is arranged in the wire installation cavity. The front end of the wire 6 is fixedly connected to the radio frequency ablation electrode 52, and the rear end of the wire 6 passes through the outer wall of the wire installation cavity and is connected to the radio frequency connector 7, and the radio frequency connector 7 is used to connect to the radio frequency signal generator; the rear end of the insertion catheter 3 is provided with a drainage guide wire connector 1, and the drainage guide wire connector 1 is a Luer connector; before the heating body is inserted into the varicose vein lesion along the venous cavity, the guide wire is inserted into the insertion catheter through the drainage guide wire connector 1; during the negative pressure drainage process, it is connected to the negative pressure drainage device through the drainage guide wire connector 1. Figure 1 It can be seen that a control handle 2 is provided on the rear portion of the insertion catheter 3, and the insertion catheter 3 passes through the control handle 2 from front to back.
[0023] When in use, insert the guide wire into the insertion catheter through the drainage guide wire connector, insert the heating body into the varicose vein lesion, then pull out the guide wire, connect the drainage guide wire connector to the negative pressure drainage device, connect the radio frequency connector to the radio frequency signal generator, and the negative pressure drainage device will work to draw out the blood accumulated in the varicose veins, so that the venous wall of the varicose veins is close to or against the heating body; the heat source works and the heating body heats the vascular wall, making the vascular wall inactive and sealed. Because the side wall of the blood vessel is close to or against the outside of the heating body, the vascular wall is heated evenly, and the consistency of the inactivation of the vascular wall is high, so it is not easy to have recanalization, varicose vein recurrence, etc., and it is not easy to form thrombosis and thrombophlebitis.
[0024] Example 2
[0025] like Figure 3 , Figure 4 , Figure 5The negative pressure drainage thermal ablation catheter shown includes a flexible insertion catheter 3, a heating body and a heating cable. The heating body described in this embodiment is a ring laser fiber 11, and the heating cable is an optical cable 10. The ring laser fiber 11 is arranged at the front side of the insertion catheter, and the optical cable 10 is arranged in the insertion catheter. The front end of the optical cable 10 is connected to the ring laser fiber 11. A first negative pressure drainage hole 4 is provided on the upper side wall of the insertion catheter 3 on the rear side of the ring laser fiber 11. The diameter of the optical cable 10 is smaller than the diameter (inner diameter) of the insertion catheter 3, and the gap between the front end of the insertion catheter 3 and the optical cable 10 is the second negative pressure drainage hole. A fiber optic connector 8 for connecting to a laser is installed at the rear end of the optical cable; the rear end of the insertion catheter 3 and the optical cable 10 are sealed and connected by an annular sealing plug 9, and a drainage joint tube 12 connected to the inside of the insertion catheter is provided at the rear part of the insertion catheter 3 in front of the sealing plug 9. The drainage joint tube 12 is provided with a drainage joint 13 for connecting to a negative pressure drainage device, and the drainage joint 13 is a Luer joint. Figure 3 As can be seen in the figure, the rear part of the insertion catheter 3 is provided with a control handle 2, the insertion catheter passes through the control handle 2 from front to back, and the drainage joint tube 12 is arranged on the insertion catheter 3 at the rear side of the control handle 2. In the process of inserting the heating body into the varicose vein lesion along the vein cavity, the optical cable 10 plays the role of a guide wire. The insertion catheter 3 is a common single-lumen catheter with a simple structure and low cost.
[0026] When in use, connect the drainage connector to the negative pressure drainage device, and the optical fiber connector to the laser. Insert the ring laser fiber along the vein into the varicose veins through the catheter, and the negative pressure drainage device will work to draw out the blood accumulated in the varicose veins, so that the venous wall of the varicose veins is close to or against the heating body; the heat source works and the heating body heats the blood vessel wall, making the blood vessel wall inactive and sealed. Because the side wall of the blood vessel is close to or against the outside of the heating body, the blood vessel wall is heated evenly, and the consistency of the blood vessel wall losing activity is high, so it is not easy to have recanalization, recurrence of varicose veins, etc., and it is not easy to form thrombosis and thrombophlebitis.
Claims
1. A negative pressure drainage thermal ablation catheter, comprising a flexible insertion catheter, a heating body and a heating cable, wherein the heating body is arranged at the front of the insertion catheter, the heating cable is arranged in the insertion catheter, the front end of the heating cable is connected to the heating body, and the rear end is provided with a connector, It is characterized in that A negative pressure drainage hole is arranged on the inserted catheter at the heating body, and a drainage joint for connecting with a negative pressure drainage device is arranged at the rear end of the inserted catheter.
2. The negative pressure drainage thermal ablation catheter according to claim 1, It is characterized in that A control handle is arranged on the rear of the insertion catheter, the insertion catheter passes through the control handle from front to back, and the drainage joint is arranged on the insertion catheter at the rear side of the control handle via the connecting catheter.
3. The negative pressure drainage thermal ablation catheter according to claim 1 or 2, It is characterized in that The heating body is any one of a microwave ablation catheter, a radiofrequency ablation catheter and a laser optical fiber heating head section.
4. The negative pressure drainage thermal ablation catheter according to claim 1 or 2, It is characterized in that The heating body is a ring laser optical fiber, the heating cable is an optical cable, the rear end of the insertion catheter is sealed and connected to the optical cable, and the connector is an optical connector.
5. The negative pressure drainage thermal ablation catheter according to claim 4, It is characterized in that A first negative pressure drainage hole is provided on the upper side wall of the insertion catheter at the rear side of the ring laser fiber, the diameter of the optical cable is smaller than the diameter of the insertion catheter, and the gap between the front end of the insertion catheter and the optical cable is the second negative pressure drainage hole.
6. The negative pressure drainage thermal ablation catheter according to claim 1 or 2, It is characterized in that The heating body includes a radiofrequency ablation electrode, an electrode mounting tube and an outer protective layer. The radiofrequency ablation electrode is in the shape of a coil spring. The rear end of the electrode mounting tube is fixedly mounted on the front end of the insertion catheter. The radiofrequency ablation electrode is sleeved on the outside of the electrode mounting tube, and the electrode mounting tube is connected to the insertion catheter. The outer protective layer is sleeved on the outside of the radiofrequency ablation electrode. The front part of the outer protective layer is fixedly connected to the electrode mounting tube, and the rear part is fixedly connected to the outside of the front end of the insertion catheter. The heating cable is a wire.
7. The negative pressure drainage thermal ablation catheter according to claim 6, It is characterized in that A wire installation cavity is provided in the side wall of the insertion catheter, and the wire is arranged in the wire installation cavity. The front end of the wire is fixedly connected to the radiofrequency ablation electrode, and the rear end of the wire passes through the outer side wall of the wire installation cavity and is connected to the radiofrequency connector; a drainage guide wire connector is provided at the rear end of the insertion catheter.