Vascular sheath for chemical ablation and thermal ablation and use method thereof

Abstract

The invention relates to the technical field of varicosity treatment instruments, and discloses a blood vessel sheath for chemical ablation and thermal ablation and a using method thereof.The blood vessel sheath comprises a tube sheath and a connecting tube, the tube sheath is provided with a near end and a far end which are opposite, a tube placing channel is formed in the tube sheath in the axial direction in a penetrating mode, and a plurality of through holes are formed in the far end in the radial direction of the tube sheath in a penetrating mode; one end of the connecting tube is connected with the tube sheath, and each through hole, the tube placing channel and the connecting tube are communicated with one another. When chemical ablation treatment is carried out, after one end of the drainage catheter penetrates through the catheter indwelling channel to reach a target position, redundant blood in a blood vessel is discharged through the negative pressure aspirator, then the hardener injector is connected with the connecting tube, and a hardener is injected into the blood vessel through the through holes, so that the concentration of the hardener in the blood vessel is increased; when the ablation sheath is used for treatment, the negative pressure aspirator can be connected with the connecting tube, redundant blood in a blood vessel is discharged through the through holes, and the distance between the ablation electrode and the wall of the blood vessel is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of varicose vein treatment devices, and in particular to a vascular sheath for chemical ablation and thermal ablation and a method of using the same. Background Art

[0002] Superficial varicose veins of the lower extremities refer to the dilation and tortuosity of the superficial venous system of the lower extremities (usually the great saphenous vein or the small saphenous vein). This lesion is usually caused by venous valve insufficiency, which leads to obstruction of blood return and increased intravenous pressure, which in turn causes the veins to dilate, twist, and protrude from the skin surface. Common symptoms include leg pain, fatigue, swelling, and visible venous dilation. In severe cases, it may cause complications such as skin changes and ulcers. This disease usually progresses slowly, but if left untreated, it may lead to serious complications. Currently, chemical ablation and thermal ablation are the main treatments.

[0003] Both chemical ablation and ablation sheath treatments require that the patient's thigh root of the affected limb be tied to stop bleeding, so that the superficial vein of the affected limb can be dilated, which is convenient for guiding the vascular sheath to puncture and insert into the target position. During chemical ablation treatment, a sclerosant is injected into the vein through the vascular sheath. However, since there is more blood in the vein at this time, injecting a large amount of sclerosant will cause excessive dilation of the blood vessel, while injecting a small amount of sclerosant will cause a low concentration of sclerosant in the blood vessel, affecting the treatment effect. When using ablation sheath treatment, the ablation electrode is inserted into the target blood vessel cavity through the vascular sheath for treatment. However, since there is more blood in the vein at this time, the distance between the ablation electrode and the blood vessel wall is large, which will prolong the thermal ablation time, or require the use of an ablation electrode with a larger ablation power. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present application can, during chemical ablation treatment, pass one end of the drainage catheter through the catheterization channel to reach the target position, and then use a negative pressure aspirator to discharge excess blood in the blood vessel. Then, the sclerosant injector can be connected to the connecting tube, and the sclerosant can be injected into the blood vessel through a number of through holes, thereby increasing the sclerosant concentration in the blood vessel. During ablation sheath treatment, the negative pressure aspirator can be connected to the connecting tube, and the excess blood in the blood vessel can be discharged through a number of through holes, thereby reducing the distance between the ablation electrode and the blood vessel wall.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a vascular sheath for chemical ablation and thermal ablation, comprising: a sheath, wherein a tube placement channel is provided in the sheath along its axial direction, the tube placement channel is used to pass a drainage catheter or an ablation electrode, and the inner diameter of the tube placement channel is larger than the outer diameter of the drainage catheter and the outer diameter of the ablation electrode, and the drainage catheter is used to communicate with a negative pressure aspirator;

[0006] A plurality of through holes, the tube sheath has a proximal end and a distal end opposite to each other, the plurality of through holes are arranged on the distal end along the radial direction of the tube sheath, and each of the through holes is communicated with the tube placement channel;

[0007] A connecting tube, one end of which is connected to the tube sheath, and the connecting tube is communicated with a plurality of the through holes, and the connecting tube is used to be connected to the negative pressure aspirator and the hardener syringe respectively.

[0008] Further, the plurality of through holes respectively form a plurality of through hole groups, and the plurality of through hole groups are arranged at intervals along the axial direction of the sheath;

[0009] The plurality of through holes in each through hole group are arranged at equal intervals on the distal end along the circumference of the sheath.

[0010] Furthermore, there are two through hole groups, and each through hole group includes three through holes.

[0011] Furthermore, the outer diameter of the sheath toward the distal end and the inner diameter of the catheter placement channel gradually decrease to form a puncture portion.

[0012] Furthermore, the vascular sheath further comprises: a plurality of anti-stuck grooves, the plurality of anti-stuck grooves are all arranged in the catheter placement channel along the radial direction of the sheath, and the plurality of anti-stuck grooves correspond to the plurality of through holes one by one;

[0013] The wall thickness of the tube sheath toward the distal end remains unchanged, and a plurality of the anti-stuck grooves are respectively connected to the corresponding through holes, and the hole depth of each through hole gradually decreases toward the distal end.

[0014] Furthermore, the vascular sheath also includes: a sealing ring, which is arranged at the end of the catheter placement channel facing the distal end, and the sealing ring is coaxially arranged with the catheter placement channel, and a liquid channel is formed between the sealing ring, the sheath and the drainage catheter, and the liquid channel is respectively connected to several of the through holes and the connecting tube.

[0015] Furthermore, the vascular sheath further comprises: a separation tube, the separation tube is coaxially arranged with the catheter placement channel, and the liquid channel is formed between the sealing ring, the sheath and the separation tube.

[0016] Furthermore, the vascular sheath further comprises: a three-way valve, one end of which is connected to the end of the connecting tube away from the tube sheath, the other end of which is used to be connected to the negative pressure aspirator, and the other end of which is used to be connected to the sclerosant syringe;

[0017] The three-way valve is provided with a regulator, and the three-way valve is controlled by the regulator to connect the connecting tube with the negative pressure aspirator or to connect the connecting tube with the hardener syringe.

[0018] A method for chemical ablation of a vascular sheath for chemical ablation and thermal ablation as described above comprises the following steps:

[0019] One end of the drainage catheter is passed through the catheter placement channel and protrudes from the catheter placement channel to form a drainage port, and the drainage catheter is sucked by a negative pressure suction device to form a negative pressure drainage area outside the drainage port;

[0020] The connecting tube is connected to the hardener injector, and the hardener injector is injected through the plurality of through holes, thereby forming a positive pressure injection area outside the plurality of through holes.

[0021] A method for thermal ablation of a vascular sheath for chemical ablation and thermal ablation as described above comprises the following steps:

[0022] Pass one end of the ablation electrode through the catheter channel and protrude from the catheter channel to form an ablation portion;

[0023] The connecting tube is connected to the negative pressure aspirator, and a plurality of through holes are sucked by the negative pressure aspirator, thereby forming a negative pressure drainage area outside the plurality of through holes.

[0024] Beneficial effects: During chemical ablation treatment, the present application can pass one end of the drainage catheter through the catheterization channel to reach the target position, and then use the negative pressure suction device to discharge the excess blood in the blood vessel, and then connect the sclerosant syringe to the connecting tube, and inject the sclerosant into the blood vessel through a number of through holes, thereby increasing the sclerosant concentration in the blood vessel; during ablation sheath treatment, the negative pressure suction device can be connected to the connecting tube, and the excess blood in the blood vessel can be discharged through a number of through holes, thereby reducing the distance between the ablation electrode and the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a vascular sheath for chemical ablation and thermal ablation provided by an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a sheath provided in accordance with an embodiment of the present invention;

[0027] Figure 3 For the present invention Figure 2 A local enlarged structural schematic diagram of A;

[0028] Figure 4 A schematic diagram of the structure of a vascular sheath for chemical ablation and thermal ablation provided in another embodiment of the present invention.

[0029] The markings in the accompanying drawings are: 100, sheath; 111, catheter placement channel; 112, through hole; 113, anti-stuck groove; 114, liquid channel; 120, puncture part; 200, connecting tube; 300, sealing ring; 400, separator tube; 510, three-way valve; 520, regulator; 610, drainage catheter; 620, ablation electrode; 630, puncture device; 640, guide wire. DETAILED DESCRIPTION

[0030] The present invention provides a vascular sheath for chemical ablation and thermal ablation and a method of using the same. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0032] It should also be noted that the same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] The invention is further described below by describing embodiments in conjunction with the accompanying drawings.

[0035] This embodiment provides a vascular sheath 100 for chemical ablation and thermal ablation and a method of using the same. Figures 1 to 4As shown in , in order to solve the above technical problems, the technical solution adopted by the present invention is as follows: comprising a sheath 100 and a connecting tube 200, the sheath 100 has a proximal end and a distal end opposite to each other, a tube placement channel 111 is provided in the sheath 100 along its axial direction, and a plurality of through holes 112 are provided at the distal end of the sheath 100 along the radial direction of the sheath 100, and each through hole 112 is connected to the tube placement channel 111. Specifically, the connecting tube 200 is connected to the plurality of through holes 112 through the tube placement channels 111, respectively.

[0036] The catheter channel 111 is used to pass the drainage catheter 610 or the ablation electrode 620, and the inner diameter of the catheter channel 111 is larger than the outer diameter of the drainage catheter 610 and the outer diameter of the ablation electrode 620. When the drainage catheter 610 or the ablation electrode 620 is inserted into the catheter channel 111, the connecting tube 200 is connected to the plurality of through holes 112 through the gap between the inner wall of the sheath 100 and the drainage catheter 610 or the ablation electrode 620. The drainage catheter 610 is used to communicate with the negative pressure aspirator, and the connecting tube 200 is used to connect with the negative pressure aspirator and the hardener injector, respectively. In actual use, the drainage catheter 610 or the ablation electrode 620 can be passed through the catheter channel 111 and the connecting tube 200 can be connected to the negative pressure aspirator or the hardener injector according to different treatment plans.

[0037] It is understandable that the previous vascular sheath 100 has a single defined function, which is only used for the injection of sclerosant and the placement of ablation electrode 620. When the vascular sheath 100 is used to inject sclerosant and place ablation electrode 620, the blood in the venous cavity cannot be extracted. When the vascular sheath 100 is punctured and placed in the target area of ​​the vascular cavity, the affected limb needs to be tied to make the venous blood vessels congested and dilated. Because there is too much blood in the venous blood vessels and the venous blood vessels are already in a dilated state, too much sclerosant cannot be injected during chemical ablation treatment, otherwise it will cause excessive dilation of the venous blood vessels and affect the health of the patient. In addition, due to the excessive blood in the venous blood vessels, the sclerosant will be diluted, which will further reduce the concentration of the sclerosant in the venous blood vessels and affect the treatment effect; during ablation sheath treatment, due to the dilation of the venous blood vessels, the venous blood vessel wall will be away from the vascular sheath 100, causing the ablation electrode 620 to be away from the venous blood vessel wall during treatment. In addition, due to the excessive blood in the venous blood vessels, a large number of red blood cells will affect the treatment effect of thermal ablation.

[0038] During the chemical ablation treatment, a tourniquet is first used to tie the patient's thigh root of the affected limb to stop bleeding, so that the superficial vein of the affected limb expands, which is convenient for puncture and insertion of the sheath 100. After the sheath 100 is inserted into the target area of ​​the patient's vascular cavity, one end of the drainage catheter 610 is passed through the catheterization channel 111 and protrudes from the sheath 100, and then the other end of the drainage catheter 610 is connected to the negative pressure suction device. The tourniquet is tied near the distal end of the patient's thigh treatment area to prevent the distal vein from refluxing blood. Next, the negative pressure suction device discharges excess blood in the blood vessel through the drainage catheter 610, and can also reduce the inner diameter of the blood vessel wall, so that the treatment area artificially forms a "tourniquet" effect, and then the foam hardener is injected into the catheterization channel 111 through the connecting tube 200. The foam hardener can be evenly distributed into the vascular cavity through a number of through holes 112. Due to the reduction of blood in the target area, medical staff can inject more hardener into the target area, and due to the reduction of blood, the dilution degree of the hardener is reduced, so that the concentration of the hardener in the target area is greatly increased, thereby improving the treatment effect. In actual use, the blood in the blood vessels can be discharged through the negative pressure suction device and the foam sclerosant can be injected through the connecting tube 200 at the same time, which can greatly increase the concentration of the sclerosant and even play the role of "replacing" the blood in the blood vessels with the foam sclerosant. Compared with the conventional vascular sheath 100, it has a better therapeutic effect.

[0039] During the ablation sheath treatment, the patient's thigh root of the affected limb is first tied to stop bleeding, so that the superficial vein of the affected limb is expanded, which is convenient for puncture and insertion of the sheath 100. After the sheath 100 is inserted into the target area of ​​the patient's vascular cavity, one end of the ablation electrode 620 is passed through the catheter channel 111 and protrudes from the sheath 100. A tourniquet is tied near 610 at the distal end of the patient's thigh treatment area to prevent blood from reflux in the distal vein. Then the connecting tube 200 is connected to the negative pressure aspirator, which discharges excess red blood cells in the blood vessel through the catheter channel 111, thereby improving the efficiency of the ablation sheath treatment. At the same time, due to the reduction in the inner diameter of the vascular cavity, the distance between the ablation electrode 620 and the vascular wall is reduced, further improving the efficiency of the ablation sheath treatment.

[0040] Whether in chemical ablation treatment or ablation sheath treatment, by reducing the blood in the blood vessels, the chances of direct contact between the sclerosant and the ablation electrode 620 and the inner wall of the blood vessel can be increased, thereby shortening the treatment time and improving the treatment effect.

[0041] In one embodiment, Figures 1 to 4 As shown in , several through holes 112 respectively form several through hole 112 groups, and the several through hole 112 groups are arranged at intervals along the axial direction of the sheath 100, and the several through holes 112 in each through hole 112 group are arranged at equal intervals along the circumference of the sheath 100 on the distal end.

[0042] Specifically, by providing a plurality of through holes 112 that are equidistantly spaced along the circumference of the sheath 100, the hardener can be injected through more dense through holes 112 during chemical ablation treatment, so that the hardener is more evenly distributed in the blood vessel, achieving a better treatment effect. During ablation sheath treatment, the blood between the sheath 100 and the blood vessel wall can be more evenly discharged through a plurality of through holes 112 that are spaced along the axial direction of the sheath 100, so that the inner wall of the blood vessel wall is adsorbed on the outer surface of the sheath 100, so that the distance between the ablation electrode 620 and each part of the blood vessel wall is similar, achieving a better treatment effect.

[0043] In one embodiment, Figures 1 to 4 As shown in FIG. 1 , there are two groups of through holes 112 , and each group of through holes 112 includes three through holes 112 .

[0044] Specifically, if each through hole 112 group is provided with only two through holes 112, it is not easy to make the blood vessel wall fit with the outer surface of the sheath 100. By having at least three through holes 112, the degree of fit between the blood vessel wall and the outer surface of the sheath 100 can be better improved. However, since the size of the sheath 100 is relatively small, if too many through holes 112 are provided, the aperture of the through hole 112 is likely to be too small, which is likely to have a counter-effect. By providing three through holes 112, a good effect can be achieved (dividing the sheath into three directions, with at least three through holes in each direction).

[0045] In one embodiment, Figures 1 to 4 As shown in FIG. 1 , the outer diameter of the sheath 100 and the inner diameter of the catheter placement channel 111 gradually decrease toward the distal end to form a puncture portion 120 .

[0046] In actual use, the puncture device 630 punctures the skin, then the guide wire 640 is placed in the target area, and the sheath 100 is guided along the guide wire 640 to guide the puncture part 120 to the target area, and finally the guide wire 640 is removed to complete the placement of the sheath 100. Due to the function of the puncture part 120, the sheath 100 can be moved along the guide wire 640 more smoothly, and it is not easy to scratch the patient's tissues and blood vessels.

[0047] In one embodiment, Figures 2 to 4 As shown in , the vascular sheath 100 further includes: a plurality of anti-stuck grooves 113, the plurality of anti-stuck grooves 113 are all arranged in the catheter placement channel 111 along the radial direction of the sheath 100, and the plurality of anti-stuck grooves 113 correspond to the plurality of through holes 112 one by one;

[0048] The wall thickness of the tube sheath 100 toward the distal end remains unchanged, and a plurality of anti-stuck grooves 113 are respectively connected to corresponding through holes 112 , and the depth of each through hole 112 gradually decreases toward the distal end.

[0049] Specifically, Figure 3As shown in the figure, due to the provision of the puncture portion 120, the inner surface of the sheath 100 (the surface of the tube placement channel 111) will gradually tilt toward its axis from top to bottom, and the through hole 112 is arranged to penetrate along the radial direction of the sheath 100, which will cause the lower end of the through hole 112 to be closer to the axis of the sheath 100 than the upper end. When the drainage catheter 610 or the ablation electrode 620 is inserted into the catheter channel 111, the lower end of the drainage catheter 610 or the ablation electrode 620 enters from the upper end of the catheter channel 111. Since the lower end of the through hole 112 is closer to the axis of the sheath 100 than the upper end, when the drainage catheter 610 or the ablation electrode 620 is close to the through hole 112, the lower end of the through hole 112 will be closer to the drainage catheter 610 or the ablation electrode 620 than the upper end. If the drainage catheter 610 or the ablation electrode 620 deviates from the axial direction of the sheath 100 and moves downward in the catheter channel 111 at this time, the drainage catheter 610 or the ablation electrode 620 may contact the lower end of the through hole 112, causing the drainage catheter 610 or the ablation electrode 620 to be "stuck". By setting the anti-stuck groove 113, the distance between the upper end of the through hole 112 and the axis of the sheath 100 can be equal to the distance between the lower end of the through hole 112 and the axis of the sheath 100, or the distance between the upper end of the through hole 112 and the axis of the sheath 100 can be greater than the distance between the lower end of the through hole 112 and the axis of the sheath 100, so that the drainage catheter 610 or the ablation electrode 620 is not easy to contact the lower end of the through hole 112 when it deviates from the axial direction of the sheath 100 and moves downward in the catheter channel 111, so that the lower end of the drainage catheter 610 or the ablation electrode 620 can pass through the catheter channel 111 more smoothly.

[0050] In one embodiment, Figures 2 to 4 As shown in the figure, the vascular sheath 100 also includes: a sealing ring 300, which is arranged at the end of the catheterization channel 111 facing the distal end, and the sealing ring 300 is coaxially arranged with the catheterization channel 111, and a liquid channel 114 is formed between the sealing ring 300, the sheath 100 and the drainage catheter 610, and the liquid channel 114 is respectively connected to a plurality of through holes 112 and the connecting tube 200.

[0051] Preferably, the sealing ring 300 can be sealingly sleeved on the drainage catheter 610 so that the liquid channel 114 has only two openings, namely the through hole 112 and the connecting tube 200. Therefore, during the chemical ablation treatment, the foam sclerosant can only be distributed into the blood vessel cavity through a plurality of through holes 112, and the negative pressure aspirator can only discharge the excess blood in the blood vessel through the drainage catheter 610. This allows a distance between the site where the foam sclerosant is injected and the site where it is discharged, thereby avoiding a small distance between the two sites, causing the negative pressure aspirator to discharge blood with a high concentration of sclerosant when discharging excess blood in the blood vessel, resulting in waste.

[0052] In one embodiment, Figure 4As shown in , the vascular sheath 100 further includes: a separation tube 400 , which is coaxially arranged with the catheter placement channel 111 , and a liquid channel 114 is formed between the sealing ring 300 , the sheath 100 and the separation tube 400 .

[0053] Specifically, the catheter placement channel 111 can be divided into two channels by the separation tube 400, one of which is used to pass the drainage catheter 610 or the ablation electrode 620, and the other channel forms a liquid channel 114, so that when drainage catheters 610 or ablation electrodes 620 of different sizes are used, the connecting tube 200 can only be connected to the blood vessels through several through holes 112, thereby achieving better use effect.

[0054] In one embodiment, Figure 1 As shown in , the vascular sheath 100 further includes: a three-way valve 510, one end of the three-way valve 510 is connected to the end of the connecting tube 200 away from the sheath 100, the other end is used to connect to the negative pressure suction device, and the other end is used to connect to the hardener syringe;

[0055] The three-way valve 510 is provided with a regulator 520 , and the three-way valve 510 is controlled by the regulator 520 to connect the connecting tube 200 to the negative pressure aspirator or to connect the connecting tube 200 to the hardener syringe.

[0056] In actual use, the connection tube 200 can be adjusted to connect with the negative pressure aspirator or the hardener injector through the regulator 520, avoiding frequent plugging and unplugging. Preferably, the connection tube 200 identification part, the negative pressure aspirator identification part and the hardener injector identification part can be set on different ports of the three-way valve 510, and the chemical ablation treatment identification part and the ablation sheath treatment identification part can be set on the three-way valve 510. When the regulator 520 is aligned with the chemical ablation treatment identification part, the connection tube 200 is connected to the hardener injector; when the regulator 520 is aligned with the ablation sheath treatment identification part, the connection tube 200 is connected to the negative pressure aspirator, which is convenient for medical staff to use.

[0057] A method for chemical ablation of a vascular sheath 100 for chemical ablation and thermal ablation as described above comprises the following steps: one end of a drainage catheter 610 is passed through a catheter placement channel 111 and protrudes from the catheter placement channel 111 to form a drainage port, and the drainage catheter 610 is sucked by a negative pressure suction device to form a negative pressure drainage area outside the drainage port;

[0058] The connecting tube 200 is connected to the hardener injector, and the hardener injector is injected through the plurality of through holes 112 , thereby forming a positive pressure injection area outside the plurality of through holes 112 .

[0059] A thermal ablation method using the vascular sheath 100 for chemical ablation and thermal ablation as described above comprises the following steps: passing one end of the ablation electrode 620 through the catheter channel 111 and protruding out of the catheter channel 111 to form an ablation portion;

[0060] The connecting tube 200 is connected to the negative pressure suction device, and the plurality of through holes 112 are sucked by the negative pressure suction device, thereby forming a negative pressure drainage area outside the plurality of through holes 112 .

[0061] In summary, the present application relates to the technical field of varicose vein treatment equipment, and discloses a vascular sheath for chemical ablation and thermal ablation and a method of using the same, which includes a sheath and a connecting tube, the sheath having relative proximal and distal ends, a catheter placement channel penetrating the sheath along its axial direction, and a plurality of through holes penetrating the distal end along the radial direction of the sheath, one end of the connecting tube is connected to the sheath, and each through hole, the catheter placement channel and the connecting tube are interconnected. When performing chemical ablation treatment, the present application can pass one end of the drainage catheter through the catheter placement channel to the target position, and then discharge the excess blood in the blood vessel through a negative pressure aspirator, and then connect the hardener injector to the connecting tube, and inject the hardener into the blood vessel through a plurality of through holes, thereby increasing the hardener concentration in the blood vessel; during ablation sheath treatment, the negative pressure aspirator can be connected to the connecting tube, and the excess blood in the blood vessel can be discharged through a plurality of through holes, thereby reducing the distance between the ablation electrode and the blood vessel wall.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vascular sheath for chemical ablation and thermal ablation, characterized in that: include: A tube sheath, wherein a tube placement channel is provided in the tube sheath along its axial direction, the tube placement channel is used to pass a drainage catheter or an ablation electrode, and the inner diameter of the tube placement channel is larger than the outer diameter of the drainage catheter and the outer diameter of the ablation electrode, and the drainage catheter is used to communicate with a negative pressure aspirator; A plurality of through holes, the tube sheath has a proximal end and a distal end opposite to each other, the plurality of through holes are arranged on the distal end along the radial direction of the tube sheath, and each of the through holes is communicated with the tube placement channel; A connecting tube, one end of which is connected to the tube sheath, and the connecting tube is communicated with a plurality of the through holes, and the connecting tube is used to be connected to the negative pressure aspirator and the hardener syringe respectively.

2. The vascular sheath for chemical ablation and thermal ablation according to claim 1, characterized in that: The plurality of through holes respectively form a plurality of through hole groups, and the plurality of through hole groups are arranged at intervals along the axial direction of the sheath; The plurality of through holes in each through hole group are arranged at equal intervals on the distal end along the circumference of the sheath.

3. The vascular sheath for chemical ablation and thermal ablation according to claim 2, characterized in that: There are two through hole groups, and each through hole group includes three through holes.

4. The vascular sheath for chemical ablation and thermal ablation according to claim 1, characterized in that: The outer diameter of the tube sheath toward the distal end and the inner diameter of the tube placement channel gradually decrease to form a puncture portion.

5. The vascular sheath for chemical ablation and thermal ablation according to claim 4, characterized in that: The vascular sheath further comprises: a plurality of anti-stuck grooves, wherein the plurality of anti-stuck grooves are arranged in the tube placement channel along the radial direction of the tube sheath, and the plurality of anti-stuck grooves correspond to the plurality of through holes one by one; The wall thickness of the tube sheath toward the distal end remains unchanged, and a plurality of the anti-stuck grooves are respectively connected to the corresponding through holes, and the hole depth of each through hole gradually decreases toward the distal end.

6. The vascular sheath for chemical ablation and thermal ablation according to claim 1, characterized in that: The vascular sheath also includes: a sealing ring, which is arranged at the end of the catheter placement channel facing the distal end, and the sealing ring is coaxially arranged with the catheter placement channel, and a liquid channel is formed between the sealing ring, the sheath and the drainage catheter, and the liquid channel is respectively connected to several of the through holes and the connecting tube.

7. The vascular sheath for chemical ablation and thermal ablation according to claim 6, characterized in that: The vascular sheath further comprises: a separation tube, which is coaxially arranged with the tube placement channel, and the liquid channel is formed between the sealing ring, the tube sheath and the separation tube.

8. The vascular sheath for chemical ablation and thermal ablation according to claim 1, characterized in that: The vascular sheath further comprises: a three-way valve, one end of which is connected to the end of the connecting tube away from the sheath, the other end of which is used to be connected to the negative pressure aspirator, and the other end of which is used to be connected to the sclerosant syringe; The three-way valve is provided with a regulator, and the three-way valve is controlled by the regulator to connect the connecting tube with the negative pressure aspirator or to connect the connecting tube with the hardener syringe.

9. A method for chemical ablation of a vascular sheath for chemical ablation and thermal ablation as claimed in any one of claims 1 to 8, characterized in that: The steps include: One end of the drainage catheter is passed through the catheter placement channel and protrudes from the catheter placement channel to form a drainage port, and the drainage catheter is sucked by a negative pressure suction device to form a negative pressure drainage area outside the drainage port; The connecting tube is connected to the hardener injector, and the hardener injector is injected through the plurality of through holes, thereby forming a positive pressure injection area outside the plurality of through holes.

10. A method for thermal ablation of a vascular sheath for chemical ablation and thermal ablation as claimed in any one of claims 1 to 8, characterized in that: The steps include: Pass one end of the ablation electrode through the catheter channel and protrude from the catheter channel to form an ablation portion; The connecting tube is connected to the negative pressure aspirator, and a plurality of through holes are sucked by the negative pressure aspirator, thereby forming a negative pressure drainage area outside the plurality of through holes.

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