Ablation needle with adjustable sleeve
By using a screw adjustment mechanism in the ablation needle, the precise position adjustment of the sleeve is achieved, which solves the problem of low casing position adjustment accuracy in the prior art, and improves the operating accuracy and safety of the ablation needle.
Patent Information
- Application Number
- CN202323181724.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-24
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2033-11-24
AI Technical Summary
The cannula position adjustment accuracy of existing ablation needles is low, which affects the ablation effect and surgical safety.
The screw adjustment mechanism is adopted, and the precise movement of the sleeve along the axis of the needle rod is achieved through the cooperation of the screw rod and the slider, with a wider adjustment range and higher accuracy.
It improves the accuracy of adjusting the cannula position, enhances the operation flexibility and safety of the ablation needle, and reduces the risk of surgery.
Smart Images
Figure CN222341290U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to an ablation needle with an adjustable sleeve. Background Art
[0002] Tissue and tumor ablation technology is a physical therapy method that has emerged in recent years. It has the advantages of being safe, effective, minimally invasive and effective, and is widely used in local ablation treatment of various tissues and tumors. The design and application of ablation probes is one of the core of this technology, which determines its ablation ability, minimally invasive performance, safety and effectiveness.
[0003] Before cryoablation treatment, the ablation target area needs to be positioned and punctured, and sometimes a biopsy and injection of drugs into the target area are also required. Generally, auxiliary instruments are required, such as dilating sheaths, but dilating sheaths increase surgical costs, are inconvenient to use, and will greatly increase surgical wounds, which have many adverse effects on tumor ablation surgery. Ablation probes often require a heat-insulating or insulating structure, which is generally set inside the probe. The internal structure will increase the diameter of the ablation probe, hinder the formation of ice balls, and affect the cryoablation effect.
[0004] At present, the ablation needle with a cannula usually includes a shell and an adjustment button. The shell is provided with an adjustment slot and a clamping slot. The adjustment button can be slidably set in the adjustment slot. The cannula is fixedly connected to the adjustment button. The extension position of the cannula can be adjusted by clamping the adjustment button in the clamping slot at different positions. However, the adjustment of the cannula position through this structure is only limited to the position where the clamping slot is set, and the adjustment accuracy is low. Utility Model Content
[0005] The present application provides an ablation needle with an adjustable cannula, which solves the technical problem of low cannula position adjustment accuracy in the prior art.
[0006] The present application provides an ablation needle with an adjustable cannula, comprising:
[0007] A housing, on which a sleeve is slidably disposed;
[0008] A screw adjustment mechanism is arranged in the housing, the sleeve is installed on the screw adjustment mechanism, and the screw adjustment mechanism can operably drive the sleeve to move.
[0009] In some embodiments, the lead screw adjustment mechanism includes a lead screw lever and a slider, the slider is threadedly matched with the lead screw lever, the lead screw lever and the sleeve are coaxially arranged, the sleeve is fixedly connected to the lead screw lever, the slider is rotatably arranged on the shell, a portion of the slider is exposed from the shell, a first slide groove is opened on the lead screw lever, a first slide bar is arranged inside the shell corresponding to the first slide groove, and the first slide groove and the first slide bar are arranged to cooperate with each other.
[0010] In some embodiments, the wire lever is provided with a first through hole along its axial direction, the sleeve is connected to the head end of the first through hole, the head end and the tail end of the wire lever are respectively provided with a first concave hole and a first conical hole corresponding to the first through hole, and the first concave hole is filled with electronic glue.
[0011] In some embodiments, a first stepped hole is provided at the tail end of the wire lever, the first stepped hole is connected to the first through hole, a sealing ring is provided in the inner hole of the first stepped hole, a first stopper is provided in the outer hole of the first stepped hole, and the first conical hole is provided on the first stopper.
[0012] In some embodiments, an identification block is fixedly provided at the tail end of the wire lever, and first visible holes are provided through the shell at both ends corresponding to the identification block, and a first pointer is provided at the end of the identification block corresponding to the first visible hole.
[0013] In some embodiments, a first limit block is fixedly disposed inside the housing at a position corresponding to the limit position of movement of the wire lever.
[0014] In some embodiments, the lead screw adjustment mechanism includes a lead screw lever and a slider, the slider is threadedly matched with the lead screw lever, the lead screw lever and the sleeve are arranged in parallel, the sleeve is fixedly connected to the slider, the lead screw lever is rotatably arranged on the shell, one end of the lead screw lever extends out of the shell and is fixedly connected to a knob, a second slide groove is opened on the side of the slider, and a second slide bar is arranged inside the shell corresponding to the second slide groove, and the second slide groove and the second slide bar are arranged to cooperate with each other.
[0015] In some embodiments, the slider is provided with a second through hole along the axial direction of the sleeve, the sleeve is connected to the head end of the second through hole, and the head end and the tail end of the slider are respectively provided with a second concave hole and a second conical hole corresponding to the second through hole, and the second concave hole is filled with electronic glue.
[0016] In some embodiments, a groove is provided on the side of the slider, a plate is fixedly provided on the side of the slider, the plate is arranged across the groove, a baffle is fixedly provided inside the shell, the baffle is located in the groove, the slider is operable to slide on the baffle, a second pointer is fixedly provided on the plate, and a second visible hole is provided on the side of the shell corresponding to the moving direction of the second pointer.
[0017] In some embodiments, a second limit block is fixedly disposed inside the housing at a position corresponding to the limit position of movement of the slider.
[0018] In some embodiments, a second stepped hole is opened at the tail end of the slider, the second stepped hole is connected to the second through hole, a sealing ring is arranged in the inner hole of the second stepped hole, a second stopper is arranged in the outer hole of the second stepped hole, and the second conical hole is opened on the second stopper.
[0019] The beneficial effects of this application are as follows:
[0020] The ablation needle with adjustable cannula provided by the utility model drives the cannula to move along the axial direction of the needle rod through a lead screw adjustment mechanism, so that the cannula can be adjusted to any position within a measuring range, and the position adjustment accuracy of the cannula is higher. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.
[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the ablation needle with adjustable cannula provided in the present application;
[0023] Figure 2 is one of the cross-sectional views of the housing in Example 1;
[0024] Figure 3 The second cross-sectional view of the housing in Embodiment 1;
[0025] Figure 4 Schematic diagram of the structure of the screw adjustment mechanism in Example 1;
[0026] Figure 5 is a cross-sectional view of the screw adjustment mechanism in Example 1;
[0027] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the ablation needle with adjustable cannula provided in the present application;
[0028] Figure 7 is a cross-sectional view of the housing in Example 2;
[0029] Figure 8 Schematic diagram of the structure of the screw adjustment mechanism in Example 2.
[0030] Among them, 100-housing; 110-sleeve; 120-opening; 130-first slide bar; 140-first visible hole; 150-first limit block; 160-second slide bar; 170-second visible hole; 180-second limit block;
[0031] 200-screw adjustment mechanism; 210-screw lever; 211-first slide groove; 212-first through hole; 213-first inner concave hole; 214-first tapered hole; 215-first stepped hole; 216-knob; 217-second slide groove; 220-slider; 221-second through hole; 222-second inner concave hole; 223-second tapered hole; 224-groove; 225-plate; 226-baffle; 227-second pointer; 228-second stepped hole; 229-second stopper; 230-identification block; 231-first pointer. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0033] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0034] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their 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 at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0035] The embodiment of the present application solves the technical problem of low cannula position adjustment accuracy in the prior art by providing an ablation needle with an adjustable cannula.
[0036] Generally, the head end of the sleeve 110, the wire lever 210, the slider 220, and the housing 100 described in the technical solution is represented as the end close to the surgery, and the tail end is represented as the end away from the surgery.
[0037] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:
[0038] like Figure 1-Figure 8 As shown, the present application provides an ablation needle with an adjustable sleeve, comprising:
[0039] A housing 100, on which a sleeve 110 is slidably disposed;
[0040] The lead screw adjustment mechanism 200 is disposed in the housing 100 , and the sleeve 110 is mounted on the lead screw adjustment mechanism 200 . The lead screw adjustment mechanism 200 can operably drive the sleeve 110 to move.
[0041] During the process of adjusting the extension length of the sleeve 110, the sleeve 110 is driven to move along the needle rod axis by the lead screw adjustment mechanism 200, so that the sleeve 110 can be adjusted to any position within the measuring range, and the position adjustment accuracy of the sleeve 110 is higher.
[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0043] Example 1
[0044] like Figure 1-Figure 5 As shown, the lead screw adjustment mechanism 200 includes a lead screw lever 210 and a slider 220, the slider 220 is threadedly matched with the lead screw lever 210, the lead screw lever 210 and the sleeve 110 are coaxially arranged, the sleeve 110 is fixedly connected to the lead screw lever 210, the slider 220 is rotatably arranged on the housing 100, and a slot for accommodating the slider 220 is arranged inside the housing 100, so that the slider 220 can rotate on the housing 100, and the slider 220 will not move along the axial direction of the sleeve 110, and a part of the slider 220 is exposed. The shell 100 may be provided with openings 120 on two opposite sides of the shell 100 so that the slider 220 is exposed from the shell 100. Specifically, the slider 220 is cylindrical and rotates about the axis of the sleeve 110. Anti-slip grooves are provided on the outer side of the slider 220 to facilitate manual operation of the slider 220 to rotate. A first slide groove 211 is provided on the wire lever 210, and a first slide bar 130 is provided inside the shell 100 corresponding to the first slide groove 211. The first slide groove 211 and the first slide bar 130 are provided in cooperation with each other.
[0045] In actual use, the wire lever 210 and the sleeve 110 are coaxially arranged so that the screw adjustment mechanism 200 is evenly distributed around the sleeve 110, reducing the space occupied by the screw adjustment mechanism 200 inside the shell 100. Since the wire lever 210 has a certain length, the sleeve 110 is driven to move by the wire lever 210, which will increase the overall length of the shell 100 to a certain extent; by rotating the slider 220, the slider 220 only rotates, and the slider 220 does not move in the axial direction of the wire lever 210, and the first slide groove 211 on the wire lever 210 and the first slide bar 130 on the shell 100 are cooperated, and the first slide groove 211 and the first slide bar 130 play a limiting role on the wire lever 210 to prevent the wire lever 210 from rotating, and finally the wire lever 210 is moved along the axial direction of the sleeve 110, and the wire lever 210 drives the sleeve 110 to move, thereby adjusting the coverage of the sleeve 110 on the needle rod.
[0046] Further, such as Figure 2 , Figure 3 As shown, the wire lever 210 is provided with a first through hole 212 along its axial direction, the first through hole 212 is used for the needle rod to pass through, the needle rod is fixedly connected to the shell 100, the screw adjustment mechanism 200 drives the sleeve 110 to move, the sleeve 110 is connected to the head end of the first through hole 212, and the head end and the tail end of the wire lever 210 are respectively provided with a first inner recessed hole 213 and a first conical hole 214 corresponding to the first through hole 212, the first inner recessed hole 213 is filled with electronic glue, and the first conical hole 214 is convenient for the needle body to penetrate.
[0047] During the installation of the sleeve 110, the sleeve 110 is first inserted into the first inner recessed hole 213. The first inner recessed hole 213 can be a stepped hole or a combination of a stepped hole and a tapered hole. The sleeve 110 and the inner hole of the first inner recessed hole 213 are gap-matched, and electronic glue is filled in the outer hole of the first inner recessed hole 213. After the electronic glue solidifies, the electronic glue firmly fixes the sleeve 110 in the first inner recessed hole 213. At the same time, the electronic glue has a sealing effect between the sleeve 110 and the wire lever 210.
[0048] Further, such as Figure 5 As shown, a first stepped hole 215 is provided at the tail end of the wire lever 210, the first stepped hole 215 is communicated with the first through hole 212, a sealing ring is provided in the inner hole of the first stepped hole 215, a first stopper 217 is provided in the outer hole of the first stepped hole 215, and the first conical hole 214 is provided on the first stopper 217.
[0049] The sealing ring is pressed into the inner hole of the first stepped hole 215, and then the first stopper 217 is placed in the outer hole of the first stepped hole 215. The first stopper 217 and the first stepped hole 215 can be fixed by sealant or by threaded engagement. During the insertion of the needle rod, the first conical hole 214 facilitates the insertion of the needle body. The sealing ring seals the needle body and the inner wall of the first through hole 212 to prevent the body's fluid from flowing out of the gap between the needle body and the inner wall of the first through hole 212. When the body's gas needs to be discharged, the sealing ring can be removed, and the body's gas is discharged from the gap between the needle body and the inner wall of the first through hole 212.
[0050] Further, such as Figure 1 , Figure 4 As shown, an identification block 230 is fixedly provided at the tail end of the wire lever 210, and a penetrating first visible hole 140 is opened on the shell 100 at both ends corresponding to the identification block 230, a scale is provided on the shell 100 corresponding to the first visible hole 140, and a first pointer 231 is provided at the end of the identification block 230 corresponding to the first visible hole 140.
[0051] For details, see Figure 1 , Figure 2 , Figure 3 , Figure 5 At least one first visible hole 140 is opened on the shell 100. In production, the first visible hole 140 penetrating the shell 100 can be opened on one side of the wire lever 210, or two first visible holes 140 penetrating the shell 100 can be opened on both sides of the wire lever 210. During the adjustment of the slider 220, the wire lever 210 drives the identification block 230 to move, and the first pointer 231 moves in the first visible hole 140, so that the user can see the adjusted length of the sleeve 110 more intuitively.
[0052] Furthermore, a first limit block 150 is fixedly provided inside the shell 100 at the extreme position of the movement of the wire lever 210, and the first limit blocks 150 are provided at both ends of the shell 100. When the wire lever 210 moves in the shell 100, when the first pointer 231 moves to the end position of the first visible hole 140, the first limit block 150 contacts the wire lever 210 to limit the wire lever 210.
[0053] Working principle:
[0054] First, rotate the slider 220. The slider 220 and the shell 100 are rotatably connected to make the wire lever 210 move in the shell 100. The wire lever 210 drives the sleeve 110 to move. The needle body is fixed on the shell 100 to adjust the position of the sleeve 110 on the needle body. The movement of the wire lever 210 drives the first pointer 231 to move in the first visible hole 140, which is convenient for observing the length of the needle body exposed from the sleeve 110. The sleeve 110 is adjusted by the slider 220 and the wire lever 210 with high adjustment accuracy. The cooperation of the slider 220 and the wire lever 210 can prevent loosening and avoid changes in the position of the sleeve 110.
[0055] Example 2
[0056] like Figure 6-Figure 8 As shown, the screw adjustment mechanism 200 includes a screw lever 210 and a slider 220, the slider 220 is threadedly matched with the screw lever 210, the screw lever 210 and the sleeve 110 are arranged in parallel, the sleeve 110 is fixedly connected to the slider 220, the screw lever 210 is rotatably set on the shell 100, one end of the screw lever 210 extends out of the shell 100 and is fixedly connected with a knob 216, a second slide groove 217 is opened on the side of the slider 220, and a second slide bar 160 is arranged inside the shell 100 corresponding to the second slide groove 217, and the second slide groove 217 and the second slide bar 160 are arranged in cooperation with each other.
[0057] During use, the wire lever 210 and the sleeve 110 are arranged in parallel, and the sleeve 110 is driven to move by the slider 220. The slider 220 itself has a small width and will not increase the length of the shell 100. However, since the wire lever 210 and the sleeve 110 are arranged in parallel, the width of the shell 100 will be increased; by rotating the knob 216, the wire lever 210 rotates inside the shell 100, and the second slide groove 217 on the slider 220 and the second slide bar 160 on the shell 100 are arranged in cooperation. The second slide groove 217 and the second slide bar 160 limit the slider 220 to prevent the slider 220 from rotating, and finally the slider 220 moves along the axial direction of the sleeve 110, and the slider 220 drives the sleeve 110 to move, thereby adjusting the coverage of the sleeve 110 on the needle rod.
[0058] Further, such as Figure 7 As shown, the slider 220 is provided with a second through hole 221 along the axial direction of the sleeve 110, the sleeve 110 is connected to the head end of the second through hole 221, and the head end and the tail end of the slider 220 are respectively provided with a second inner recessed hole 222 and a second conical hole 223 corresponding to the second through hole 221, and the second inner recessed hole 222 is filled with electronic glue.
[0059] During the installation of the sleeve 110, the sleeve 110 is first inserted into the second inner recessed hole 222. The inner recessed hole can be a stepped hole or a combination of a stepped hole and a tapered hole. The sleeve 110 and the inner hole of the second inner recessed hole 222 are gap-matched, and electronic glue is filled in the outer hole of the second inner recessed hole 222. After the electronic glue solidifies, the electronic glue firmly fixes the sleeve 110 in the second inner recessed hole 222. At the same time, the electronic glue has a sealing effect between the sleeve 110 and the slider 220.
[0060] Furthermore, a groove 224 is provided on the side of the slider 220, and a plate body 225 is fixedly provided on the side of the slider 220. The plate body 225 is arranged across the groove 224. A baffle 226 is fixedly provided inside the shell 100. The baffle 226 is located in the groove 224. The slider 220 can be operated to slide on the baffle 226. A second pointer 227 is fixedly provided on the plate body 225. A second visible hole 170 is provided on the side of the shell 100 corresponding to the moving direction of the second pointer 227, and a scale is provided on the shell 100 corresponding to the second visible hole 170.
[0061] Specifically, Figure 6 As shown, at least one second visible hole 170 is opened on the shell 100. In production, it is possible to choose to open a second visible hole 170 that passes through the shell 100 on one side of the slider 220, or to open two second visible holes 170 that pass through the shell 100 on both sides of the slider 220. During the process of adjusting the knob 216, the wire lever 210 drives the slider 220 to move, and the second pointer 227 moves in the second visible hole 170, so that the user can see the adjusted length of the sleeve 110 more intuitively.
[0062] Furthermore, a second limit block 180 is fixedly provided inside the shell 100 at the extreme position of the movement of the slider 220, and second limit blocks 180 are provided at both ends of the shell 100. When the slider 220 moves in the shell 100, when the second pointer 227 moves to the end position of the second visible hole 170, the second limit block 180 contacts the slider 220 to limit the slider 220.
[0063] Furthermore, a second stepped hole 228 is provided at the tail end of the slider 220, the second stepped hole 228 is connected to the second through hole 221, a sealing ring is provided in the inner hole of the second stepped hole 228, a second stopper 229 is provided in the outer hole of the second stepped hole 228, and the second conical hole 223 is provided on the second stopper 229.
[0064] The sealing ring is pressed into the inner hole of the second stepped hole 228, and then the second stopper 229 is placed in the outer hole of the second stepped hole 228. The second stopper 229 and the second stepped hole 228 can be fixed by sealant or by threaded fit. During the insertion of the needle rod, the second conical hole 223 facilitates the insertion of the needle body. The sealing ring seals the needle body and the inner wall of the second through hole 221 to prevent the body's liquid from flowing out from the gap between the needle body and the inner wall of the second through hole 221. When the body's gas needs to be discharged, the sealing ring can be removed, and the body's gas is discharged from the gap between the needle body and the inner wall of the second through hole 221.
[0065] Working principle:
[0066] First, rotate the knob 216, and the wire lever 210 and the shell 100 are rotatably connected to make the slider 220 move in the shell 100, and the slider 220 drives the sleeve 110 to move. The needle body is fixed on the shell 100, so that the position of the sleeve 110 on the needle body can be adjusted. Through the movement of the slider 220, the second pointer 227 is driven to move in the second visible hole 170, so as to facilitate the observation of the length of the needle body exposed from the sleeve 110, and the sleeve 110 is adjusted by the slider 220 and the wire lever 210 with high adjustment accuracy. The cooperation of the slider 220 and the wire lever 210 can prevent loosening and avoid changes in the position of the sleeve 110.
[0067] Furthermore, the moving speed of the sleeve 110 can be adjusted by setting the inclination angle of the thread in the screw adjustment mechanism 200, so that the moving speed of the sleeve 110 and the stability of the screw adjustment mechanism 200 meet the needs of the operator.
[0068] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.
[0069] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. An ablation needle with an adjustable cannula, characterized in that: include: A housing, on which a sleeve is slidably disposed; A screw adjustment mechanism is arranged in the housing, the sleeve is installed on the screw adjustment mechanism, and the screw adjustment mechanism can operably drive the sleeve to move.
2. The ablation needle with adjustable cannula as claimed in claim 1, characterized in that: The screw adjustment mechanism includes a screw lever and a slider, the slider is threadedly matched with the screw lever, the screw lever and the sleeve are coaxially arranged, the sleeve is fixedly connected to the screw lever, the slider is rotatably arranged on the shell, a part of the slider is exposed from the shell, a first slide groove is opened on the screw lever, a first slide bar is arranged inside the shell corresponding to the first slide groove, and the first slide groove and the first slide bar are arranged to cooperate with each other.
3. The ablation needle with adjustable cannula as claimed in claim 2, characterized in that: The wire lever is provided with a first through hole along its axial direction, the sleeve is connected to the head end of the first through hole, the head end and the tail end of the wire lever are respectively provided with a first inner concave hole and a first conical hole corresponding to the first through hole, and the first inner concave hole is filled with electronic glue.
4. The ablation needle with adjustable cannula as claimed in claim 3, characterized in that: A first stepped hole is provided at the tail end of the wire lever, the first stepped hole is connected to the first through hole, a sealing ring is provided in the inner hole of the first stepped hole, a first stopper is provided in the outer hole of the first stepped hole, and the first conical hole is provided on the first stopper.
5. The ablation needle with adjustable cannula as claimed in claim 2, characterized in that: An identification block is fixedly provided at the tail end of the wire lever, and first visible holes are provided through the shell at both ends corresponding to the identification block, and a first pointer is provided at the end of the identification block corresponding to the first visible hole.
6. The ablation needle with adjustable cannula as claimed in claim 2, characterized in that: A first limiting block is fixedly arranged inside the housing at a position corresponding to the limit position of movement of the wire lever.
7. The ablation needle with adjustable cannula as claimed in claim 1, characterized in that: The lead screw adjustment mechanism includes a lead screw lever and a slider, the slider is threadedly matched with the lead screw lever, the lead screw lever and the sleeve are arranged in parallel, the sleeve is fixedly connected to the slider, the lead screw lever is rotatably arranged on the shell, one end of the lead screw lever extends out of the shell and is fixedly connected to a knob, a second slide groove is opened on the side of the slider, a second slide bar is arranged inside the shell corresponding to the second slide groove, and the second slide groove and the second slide bar are arranged to cooperate with each other.
8. The ablation needle with adjustable cannula as claimed in claim 7, characterized in that: The slider is provided with a second through hole along the axial direction of the sleeve, the sleeve is connected to the head end of the second through hole, the head end and the tail end of the slider are respectively provided with a second inner concave hole and a second conical hole corresponding to the second through hole, and the second inner concave hole is filled with electronic glue.
9. The ablation needle with adjustable cannula as claimed in claim 7, characterized in that: A groove is provided on the side of the slider, and a plate is fixedly provided on the side of the slider. The plate is arranged across the groove. A baffle is fixedly provided inside the shell, and the baffle is located in the groove. The slider can slide on the baffle operably, and a second pointer is fixedly provided on the plate. A second visible hole is provided on the side of the shell corresponding to the moving direction of the second pointer.
10. The ablation needle with adjustable cannula according to claim 7, characterized in that: A second limiting block is fixedly arranged inside the housing at a position corresponding to the limit position of movement of the sliding block.
11. The ablation needle with adjustable cannula as claimed in claim 8, characterized in that: A second stepped hole is provided at the tail end of the slider, the second stepped hole is communicated with the second through hole, a sealing ring is provided in the inner hole of the second stepped hole, a second stopper is provided in the outer hole of the second stepped hole, and the second conical hole is provided on the second stopper.