Liquid injection tissue separation needle for microwave ablation
By using the liquid injection tissue separation needle during microwave ablation to form a liquid isolation belt, the problem of high heat damage to surrounding tissues is solved, and treatment safety and operational vision are improved.
Patent Information
- Application Number
- CN202421206209.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-29
AI Technical Summary
During microwave ablation, the high heat generated by the ablation needle can easily damage healthy tissue around the tumor.
A liquid injection tissue separation needle for microwave ablation is designed. By injecting liquid into the gap between the lesion area and the surrounding tissue, a stable liquid isolation belt is formed to prevent the heat generated by the ablation needle from damaging the surrounding tissue.
It effectively prevents the ablation needle from burning nearby surrounding tissues by the heat generated by the ablation needle, and improves the operating field under ultrasound guidance.
Smart Images
Figure CN222623062U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a liquid injection tissue separation needle for microwave ablation. Background Art
[0002] Microwave ablation is a technology for treating tumors by microwave thermal coagulation. Compared with traditional chemotherapy, radiotherapy and other therapies, it is easier to achieve a radical effect similar to surgery because it directly destroys the tumor. However, the microwave ablation needle will generate high heat during ablation. When ablating tumors close to human tissues, the high heat generated by the microwave ablation needle is likely to damage the surrounding tissues near the tumor. Utility Model Content
[0003] In view of this, the utility model provides a liquid-injected tissue separation needle for microwave ablation to solve the problem that the high heat generated by the ablation needle during microwave ablation easily damages the healthy tissue around the tumor.
[0004] The utility model provides a liquid injection tissue separation needle for microwave ablation, which is inserted into the gap between the lesion area and the surrounding tissue. The liquid injection tissue separation needle for microwave ablation comprises:
[0005] The needle body has a channel inside, the channel runs through the needle body, and the outer wall of the needle head of the needle body is arc-shaped;
[0006] The water injection joint is arranged at one end of the needle body away from the needle head. The water injection joint is connected with the channel and is suitable for injecting liquid into the gap through the channel to form a liquid isolation zone.
[0007] Beneficial effects: The needle is suitable for smoothly extending into the gap under ultrasound guidance, while avoiding damage to surrounding tissues; the lesion area and surrounding tissues are pried apart by levering action to separate them by a sufficient distance; liquid is injected into the pried area using the needle body to form a stable liquid isolation zone, thereby preventing the heat generated by the ablation needle in the lesion area from burning adjacent surrounding tissues, while improving the operating field of view under ultrasound guidance.
[0008] In an optional embodiment, the curvature of the outer wall of the needle satisfies the equation y=kx2-(d / 2)*(d / 2)k, where 1≤k≤10; d is the inner diameter of the channel; x is the vertical distance from the outer wall of the needle to its axis, and x≥(d / 2); y is the vertical distance from the side wall of the needle to its needle tip.
[0009] Beneficial effect: By making the outer wall of the needle into an arc shape and satisfying the equation y=kx2-(d / 2)*(d / 2)k, the needle can smoothly puncture the gap and avoid damaging the surrounding tissue during operation.
[0010] In an optional embodiment, the liquid-injected tissue separation needle for microwave ablation is suitable for reaching a desired position along a guide wire, and the outer diameter of the guide wire is s, wherein d≥s, so as to allow the channel to allow the guide wire to pass through.
[0011] Beneficial effect: By making the inner diameter of the channel greater than or equal to the outer diameter of the guide wire, it is convenient for the liquid injection tissue separation needle for microwave ablation to pass along the guide wire to the desired position.
[0012] In an optional embodiment, a marking ring is further provided on the outer wall of the needle body, and the marking ring is exposed to the human body so that an operator can observe the relative position of the needle body and the human body through the marking ring.
[0013] Beneficial effect: By setting the marking ring, the operator can observe the relative position of the needle body and the human body, and when it is found that the needle body gradually moves in the direction of exiting the human body with the human body's breathing, manual reset can be performed in time.
[0014] In an optional embodiment, the marking ring protrudes from the outer wall of the needle body, and the marking ring is suitable for abutting against the skin surface of a human body to limit the movement of the needle body toward the inside of the human body.
[0015] Beneficial effect: When the needle body is inserted into the human body, the marking ring is brought into contact with the surface of the human skin to prevent the needle body from being inserted too deeply, thereby improving the safety of use.
[0016] In an optional embodiment, a plurality of scale lines are provided on the outer wall of the needle body, and the plurality of scale lines are spaced apart along the axis of the needle body, so that an operator can know the depth of the needle body entering the human body by observing the scale lines.
[0017] Beneficial effect: By setting a plurality of scale lines on the outer wall of the needle, the operator can grasp the depth of the needle body entering the human body.
[0018] In an optional embodiment, digital marks are also provided on the outer wall of the needle body corresponding to the scale lines, so that the operator can intuitively know the depth to which the needle body has entered the human body.
[0019] Beneficial effect: By setting digital marks on the outer wall of the needle body corresponding to the scale lines, the operator can intuitively observe the depth of the needle body entering the human body, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a side view of the liquid injection tissue separation needle for microwave ablation of the utility model;
[0022] Figure 2 for Figure 1 A partial enlarged view of the middle A;
[0023] Figure 3 Schematic diagram of the curvature of the outer wall of the needle under different k values when the inner wall diameter of the needle is 0.89 mm;
[0024] Figure 4 Schematic diagram of the curvature of the outer wall of the needle corresponding to different outer diameters of the needle when the inner wall diameter of the needle is 0.89 mm and k=5;
[0025] Figure 5 This is a front view of the liquid injection tissue separation needle assembly for microwave ablation of the utility model;
[0026] Figure 6 A schematic diagram of microwave ablation of a lesion area using ablation in the related art;
[0027] Figure 7 A schematic diagram of forming a water injection isolation zone using a PTC puncture needle in the related art;
[0028] Figure 8 This is a schematic diagram of using a PTC puncture needle to introduce a guide wire into the gap between the lesion and the surrounding tissue under ultrasound guidance of the utility model;
[0029] Fig. 9 This is a schematic diagram of the present invention after the guide wire is in place and the PTC puncture needle is withdrawn;
[0030] Fig.10 It is a schematic diagram of the liquid-injected tissue separation needle for microwave ablation under ultrasound guidance of the utility model being inserted into the gap between the lesion and the surrounding tissue along the guide wire;
[0031] Fig.11 for Figure 8 A partial enlarged view of point B in the middle;
[0032] Fig.12 This is a schematic diagram of the present invention after the liquid injection tissue separation needle for microwave ablation is in place and the guide wire is withdrawn;
[0033] Fig.13 It is a schematic diagram of the utility model of prying apart the lesion and the surrounding tissue by lever action under ultrasound guidance, and forming a stable liquid isolation zone after injecting liquid;
[0034] Fig.14 It is a schematic diagram of the present invention when microwave ablation is performed after a stable liquid isolation zone is formed.
[0035] Description of reference numerals:
[0036] 1. Needle body; 101. Channel; 102. Needle; 2. Water injection joint; 3. Graduation line; 4. PTC puncture needle; 5. Marking ring; 6. Ultrasound probe; 7. Ablation needle; 8. Gap; 9. Guide wire; 10. Lesion area; 11. Liquid isolation zone; 12. Lung; 13. Liver; 14. Skin; 15. Diaphragm. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 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", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0040] Microwave ablation is a technology for treating tumors by microwave thermal coagulation. It often uses ultrasound guidance and positioning. The microwave ablation needle is directly inserted into the tumor through percutaneous puncture. The microwave power radiation heats the tumor tissue to above 50 degrees Celsius and maintains it for a period of time, causing the tumor tissue in the area to coagulate and necrotize, forming a spherical coagulation necrosis area with clear boundaries, achieving the purpose of inactivating cancerous tissue in situ. In current clinical applications, microwave ablation needles generate high heat during ablation. When ablating liver tumors that are close to surrounding tissues, the high heat generated by the microwave ablation needle can easily damage the gastrointestinal tract or diaphragm that is close to the liver. In severe cases, it can cause gastrointestinal perforation or diaphragm perforation in patients. The current clinical solution to this problem is mainly to isolate with a water-injected isolation belt, but this isolation belt is unstable, and the liquid in the isolation belt is easy to flow away, requiring a large amount of liquid to be supplemented. The operation is complicated, which limits clinical use and is prone to complications such as "water poisoning".
[0041] Combine the following Figures 1 to 14 , describing an embodiment of the utility model.
[0042] According to an embodiment of the utility model, a liquid injection tissue separation needle for microwave ablation is provided, which is inserted into a gap 8 between a lesion area 10 and surrounding tissues. The liquid injection tissue separation needle for microwave ablation comprises:
[0043] The needle body 1 has a channel 101 formed inside, the channel 101 penetrates the needle body 1, the outer wall of the needle head 102 of the needle body 1 is arc-shaped, and the needle head 102 is suitable for extending into the gap 8;
[0044] The water injection joint 2 is arranged at one end of the needle body 1 away from the needle head 102 . The water injection joint 2 is connected to the channel 101 and is suitable for injecting liquid into the gap 8 through the channel 101 to form a liquid isolation zone 11 .
[0045] The liquid-injected tissue separation needle for microwave ablation provided in this embodiment uses the needle body 1 under ultrasound guidance to pry apart the lesion area 10 and surrounding tissues by using a lever action, and injects liquid into the pried-apart gap 8 to form a stable liquid isolation zone 11, thereby preventing the heat generated by the ablation needle 7 at the lesion area 10 from burning the adjacent surrounding tissues and improving the ultrasound-guided operation field of view.
[0046] Specifically, combined Figure 6 As shown, when microwave ablation is performed on a tumor on the liver 13, the lung 12 or diaphragm 15 or gastrointestinal tract near the liver 13 is easily burned by the heat generated by the ablation needle 7. Take the microwave ablation of a tumor on the liver 13 near the lung 12 using the ablation needle 7 as an example, wherein the tumor is structured as a lesion area 10, and there is a gap 8 between the lung 12 and the diaphragm 15 and the liver 13. The needle 102 is inserted into the gap 8 under ultrasound guidance, and the liver and surrounding tissues are separated by a sufficient distance through the lever action. The water injection connector 2 is suitable for connecting to the water injection pipeline, and the water injection pipeline is suitable for injecting liquid into the channel 101 of the needle body 1 through the water injection connector 2, so that the liquid passes through the channel 101 to reach the gap 8, thereby forming a liquid isolation zone 11 at the gap 8, and then the liver 13 is isolated from the lung 12 and the diaphragm 15 by the liquid isolation zone 11, preventing the lung 12 and the diaphragm 15 from being burned by the heat generated by the ablation needle 7 at the lesion area 10, thereby improving safety. Combined with Figure 7As shown, in the related art, a liquid such as physiological saline or glucose solution is injected into the gap 8 between the lesion area 10 and the surrounding tissues through a PTC puncture needle (percutaneous transhepatic puncture cholangiography needle) 4 to form a water-injected isolation zone, but this isolation zone is unstable and the liquid in the isolation zone is easy to flow away (this is because the liver is not the lowest place in the abdominal cavity, and the liquid in the isolation zone flows to other places in the abdominal cavity due to the principle that water flows to lower places; in addition, due to the effect of gravity, the liver also has a squeezing effect on the liquid in the isolation zone, which also makes it difficult to form an isolation zone), so a large amount of liquid needs to be supplemented, and it is easy to cause complications such as "water poisoning"; this embodiment introduces a microwave ablation liquid injection tissue separation needle with an arc-shaped outer wall of the needle head 102, combined with Fig.13 As shown, Fig.13 The direction F shown in the figure is the force direction of the needle body 1 near the water injection joint 2, which is equivalent to using the lever principle to pry open a space for the liver 13 downwards, prying open the liver 13 and the surrounding tissues through the lever action, and injecting liquids such as physiological saline or glucose. Due to the surface tension of the liquid, they will remain in the pried-open gap 8, thereby forming a stable liquid isolation zone 11; and, since the lung 12 above the liver 13 will affect the ultrasonic observation of the liver 13 and the surgical guidance, the gap 8 between the liver 13 and the lung 12 is pried open and a liquid isolation zone 11 is formed at the gap 8. The principle that liquid is conducive to the propagation of ultrasonic waves can be used to improve the ultrasonic guided surgical field formed by the ultrasonic probe 6. In addition, the PTC puncture needle 4 is relatively sharp and can easily scratch human tissues and cause bleeding. The outer wall of the needle head 102 of the liquid injection tissue separation needle for microwave ablation provided in this embodiment is arc-shaped, which is conducive to avoiding scratches on tissues by the needle head 102 when separating tissues. In addition, multiple liquid injection tissue separation needles for microwave ablation can be used in combination, which is conducive to further improving the safety and effectiveness of ablation, thereby improving the actual use effect.
[0047] In some embodiments, in combination Figures 1 to 14 As shown, the curvature of the outer wall of the needle 102 satisfies the equation y=kx2-(d / 2)*(d / 2)k, wherein 1≤k≤10; d is the inner diameter of the channel 101; x is the vertical distance from the outer wall of the needle 102 to its axis, and x≥(d / 2); y is the vertical distance from the side wall of the needle 102 to its needle tip.
[0048] The liquid injection tissue separation needle for microwave ablation provided in this embodiment has an arc-shaped outer wall of the needle 102 and satisfies the equation y=kx2-(d / 2)*(d / 2)k, so that the needle 102 can smoothly puncture the gap 8 and avoid scratching human tissue.
[0049] Specifically, combined Figure 1 , Figure 2 and Figure 3As shown, by making the arc of the arc-shaped outer wall of the needle 102 satisfy the equation y=kx2-(d / 2)*(d / 2)k, the outer wall of the needle 102 is rounded parabolic, so that the needle 102 can smoothly puncture the gap 8 and avoid scratching human tissue. Figure 3 Schematic diagram of the outer wall curvature curve of the needle 102 corresponding to when k is 1, 5 and 10 respectively when the inner diameter of the needle 102 is 0.89 mm.
[0050] In some embodiments, in combination Figures 1 to 14 As shown, the liquid-injected tissue separation needle for microwave ablation is suitable for reaching a desired position along the guide wire 9 , and the outer diameter of the guide wire 9 is s, wherein d≥s, so that the channel 101 allows the guide wire 9 to pass through.
[0051] The liquid injection tissue separation needle for microwave ablation provided in this embodiment makes the inner diameter of the channel 101 greater than or equal to the outer diameter of the guide wire 9, so that the liquid injection tissue separation needle for microwave ablation can be inserted along the guide wire 9 to a desired position.
[0052] Specifically, combined Figure 8 As shown, a guide wire 9 is introduced into the gap 8 between the liver 13 and the lung 12 through a PTC puncture needle 4 commonly used in clinical practice; Fig. 9 As shown, after the guide wire 9 is in place, the PTC puncture needle 4 is withdrawn; then the end of the guide wire 9 exposed to the human body is inserted into the channel 101 through the needle 102, and then passed out from the water injection joint 2; combined Fig.10 , Fig.11 and Fig.12 As shown, the needle body 1 is inserted into the gap 8 along the guide wire 9; the lesion area 10 and the surrounding tissue are separated by physical action of the lever principle, and after the needle 102 is in place, the guide wire 9 is pulled out (it should be noted that the specific operations of introducing the guide wire and pulling out the guide wire belong to the common knowledge of those skilled in the art and will not be repeated here); combined with Fig.13 As shown, liquid is injected into the channel 101 through the water injection joint 2 connected to the water injection pipeline, and the liquid enters the gap 8 through the needle 102, so as to form a liquid isolation zone 11 at the gap 8. The liquid includes physiological saline or glucose solution, etc., and the liquid is injected into the channel 101 through the water injection joint 2, which is conducive to improving the convenience of operation; combined with Fig.14 As shown, after the liquid isolation zone 11 is formed, the ablation needle 7 is introduced to perform microwave ablation on the lesion area 10 .
[0053] The diameter of the guide wire 9 includes various specifications. For example, the diameter of the guide wire 9 is 0.89 mm. The inner diameter d of the channel 101 is ≥ 0.89 mm, so that the guide wire 9 can pass through the channel 101. Preferably, when y = 0, x = (d / 2), at this time, the outer wall of the needle 102 and the inner wall of the channel 101 meet at the needle tip of the needle 102. The specifications of the needle body 1 include various specifications, combined with Figure 4 As shown, as a feasible implementation form, the inner diameter of the channel 101 is 0.89mm, the main body of the needle body 1 is in the shape of a straight tube, and the outer diameter of the selected needle body 1 is between 1.2mm and 3.4mm. The outer diameter of the needle body 1 is the same as the maximum outer diameter of the needle head 102, that is, the maximum value of x is between 0.6mm and 1.7mm, and x≥(d / 2) is satisfied, which is conducive to the needle body 1 to smoothly puncture the gap 8 along the guide wire 9, and avoid scratching the tissue by the needle head 102 when separating the lesion area 10 and the surrounding tissue, thereby improving the safety of use. Among them, Figure 4 The minimum diameter of the outer wall of the needle 102 is 0.89 mm, and when k=5, the outer diameters of the needle body 1 are 1.2 mm, 2.4 mm, and 3.4 mm, respectively, which are corresponding to the curvature of the outer wall of the needle 102 .
[0054] In some embodiments, in combination Figures 1 to 14 As shown, a marking ring 5 is also provided on the outer wall of the needle body 1 , and the marking ring 5 is exposed to the human body so that an operator can observe the relative position of the needle body 1 and the human body through the marking ring 5 .
[0055] The liquid-injection tissue separation needle for microwave ablation provided in this embodiment is provided with a marking ring 5 so that the operator can observe the relative position of the needle body 1 and the human body, and perform manual resetting in time when it is found that the needle body 1 gradually moves in the direction of exiting the human body with the human body's breathing.
[0056] Specifically, the marking ring 5 includes at least one, and the marking ring 5 can be in the form of a groove structure, or in the form of a structure protruding from the outer wall of the needle body 1 as described below. After the needle body 1 is inserted into place, as the human body breathes, the skin 14 constantly rises and falls, and may move relative to the outer wall of the needle body 1, and under the action of friction, the position of the needle body 1 may change. By setting the marking ring 5, when the operator observes that the distance between the marking ring 5 and the surface of the skin 14 increases or decreases, or even enters the human body, that is, when the needle body 1 moves relative to the human skin 14, the needle body 1 can be manually reset in time. The position of the marking ring 5 on the needle body 1 can be set according to actual needs, ensuring that the marking ring 5 is exposed to the human body and preventing the needle from being inserted too deep.
[0057] In some embodiments, in combination Figures 1 to 14 As shown, the marking ring 5 protrudes from the outer wall of the needle body 1, and the marking ring 5 is suitable for abutting against the surface of the human skin 14 to limit the movement of the needle body 1 toward the inside of the human body.
[0058] The liquid-injection tissue separation needle for microwave ablation provided in this embodiment prevents the needle from being inserted too deeply when inserting the needle body 1 into the human body by making the marking ring 5 abut against the surface of the human skin 14, thereby improving the safety of use.
[0059] Specifically, the marking ring 5 protrudes from the outer wall of the needle body 1. The marking ring 5 can be formed by a ring sleeved on the outer wall of the needle body 1, or by protruding from a local area of the outer wall of the needle body 1. Preferably, the marking ring 5 is a ring sleeved on the needle body 1, and the ring includes a flexible ring or a rigid ring. As a feasible implementation form, the marking ring 5 is a plastic ring, and the inner wall of the plastic ring is interference-fitted with the outer wall of the needle body 1, so that there is a certain friction between the plastic ring and the outer wall of the needle body 1 to prevent the plastic ring from moving arbitrarily. According to actual needs, the position of the plastic ring on the needle body 1 can be adjusted by applying a large force to the plastic ring, so that the marking ring 5 can contact the surface of the skin 14 to limit the movement of the needle body 1 toward the inside of the human body, thereby preventing the needle from being inserted too deep, thereby improving the applicability and safety of the liquid injection tissue separation needle for microwave ablation.
[0060] In some embodiments, in combination Figures 1 to 14 As shown, the outer wall of the needle body 1 is provided with a plurality of scale lines 3, and the plurality of scale lines 3 are spaced apart along the axial direction of the needle body 1, so that an operator can know the depth of the needle body 1 entering the human body by observing the scale lines 3.
[0061] The liquid injection tissue separation needle for microwave ablation provided in this embodiment has a plurality of scale lines arranged on the outer wall of the needle head, so that the operator can control the depth of the needle body entering the human body.
[0062] Specifically, the extension direction of the scale lines 3 is perpendicular to the axial direction of the needle body 1. The scale lines 3 can be arranged in a circle along the circumference of the needle body 1, or can be arranged in a short line along the circumference of the needle body 1. Multiple scale lines 3 are equidistantly distributed along the axial direction of the needle body 1, which is conducive to the operator controlling the depth of the needle body 1 entering the human body according to observing the scale lines 3, thereby preventing the needle from being inserted too deeply and injuring non-target tissues.
[0063] In some embodiments, in combination Figures 1 to 14 As shown, the outer wall of the needle body 1 is also provided with digital marks corresponding to the scale lines 3.
[0064] The liquid-injection tissue separation needle for microwave ablation provided in this embodiment has digital marks on the outer wall of the needle body corresponding to the scale lines, so that the operator can intuitively observe the depth of the needle body entering the human body, thereby improving efficiency.
[0065] Specifically, a digital mark may be set corresponding to each scale line 3, or a digital mark may be set every few scale lines, so that the operator can intuitively know the depth of the needle body entering the human body by observing the digital mark, thereby improving efficiency.
[0066] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.
Claims
1. A liquid injection tissue separation needle for microwave ablation, characterized in that: The liquid injection tissue separation needle for microwave ablation is arranged in the gap (8) between the lesion area (10) and the surrounding tissue, and comprises: The needle body (1) has a channel (101) formed inside, the channel (101) passing through the needle body (1), the outer wall of the needle head (102) of the needle body (1) is arc-shaped, and the needle head (102) is suitable for extending into the gap (8); A water injection joint (2) is arranged at an end of the needle body (1) away from the needle head (102); the water injection joint (2) is connected to the channel (101) and is suitable for injecting liquid into the gap (8) through the channel (101) to form a liquid isolation zone (11).
2. The liquid injection tissue separation needle for microwave ablation according to claim 1, characterized in that: The curvature of the outer wall of the needle (102) satisfies the equation y=kx2-(d / 2)*(d / 2)k, wherein 1≤k≤10; d is the inner diameter of the channel (101); x is the vertical distance from the outer wall of the needle (102) to its axis, and x≥(d / 2); y is the vertical distance from the side wall of the needle (102) to its needle tip.
3. The liquid injection tissue separation needle for microwave ablation according to claim 2, characterized in that: The liquid injection tissue separation needle for microwave ablation is suitable for reaching a desired position along a guide wire (9), and the outer diameter of the guide wire (9) is s, wherein d≥s, so that the channel (101) allows the guide wire (9) to pass through.
4. The liquid injection tissue separation needle for microwave ablation according to claim 1, characterized in that: The outer wall of the needle body (1) is also provided with a marking ring (5), and the marking ring (5) is exposed to the human body so that an operator can observe the relative position of the needle body (1) and the human body through the marking ring (5).
5. The liquid injection tissue separation needle for microwave ablation according to claim 4, characterized in that: The marking ring (5) protrudes from the outer wall of the needle body (1), and the marking ring (5) is suitable for abutting against the surface of human skin (14) to limit the movement of the needle body (1) toward the inside of the human body.
6. The liquid injection tissue separation needle for microwave ablation according to any one of claims 1 to 5, characterized in that: The outer wall of the needle body (1) is provided with a plurality of scale lines (3), and the plurality of scale lines (3) are spaced apart along the axis direction of the needle body (1), so that an operator can know the depth of the needle body (1) entering the human body by observing the scale lines (3).
7. The liquid injection tissue separation needle for microwave ablation according to claim 6, characterized in that: The outer wall of the needle body (1) is also provided with numerical markings corresponding to the scale lines (3).