Ablation needle
By designing an adjustable-length ablation needle, the problem of fixed working area length of existing ablation needles has been solved, enabling flexible adjustment and stable operation, and improving ease of use and effectiveness.
Patent Information
- Application Number
- CN202520289797.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-21
AI Technical Summary
The existing ablation needles have a fixed working area length, which is inconvenient to use.
An ablation needle was designed, comprising a handle, a puncture tube, an inlet tube, a heat insulation tube, and an adjustment module. The adjustment module connects the handle and the heat insulation tube, enabling the adjustment of the working area length of the ablation needle. Stability and flexibility are ensured through structures such as limiting grooves, support blocks, and operating components.
It enables flexible adjustment of the working area length of the ablation needle and ensures stability during use, thereby improving the convenience and effectiveness of operation.
Smart Images
Figure CN223640815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical devices, and in particular to an ablation needle. Background Technology
[0002] Cryotherapy is a technique that has developed alongside interventional tumor treatment and minimally invasive techniques. It is based on the principle that cells undergo irreversible damage at extremely low temperatures, forming ice crystals inside and outside the cells, leading to cell membrane rupture and cell death. Cryotherapy often uses ablation needles.
[0003] The working area of the ablation needle is located at the tip of the needle, and its length determines the size of the freezing range. Currently, the working area of existing ablation needles has a fixed length, making them inconvenient to use. Utility Model Content
[0004] The purpose of this invention is to provide an ablation needle with an adjustable working area length.
[0005] This invention provides an ablation needle, comprising a handle, a puncture tube, an input tube, a heat insulation tube, and an adjustment module. One end of the puncture tube is fixedly connected to the handle, and the other end is a working end for puncturing tissue and performing ablation. The input tube is inserted into the puncture tube. The input tube is used to input working fluid into the working end. The heat insulation tube is inserted into the puncture tube and sleeved on the outside of the input tube. The heat insulation tube is used to achieve internal and external temperature insulation within its corresponding puncture tube segment. The heat insulation tube is movably connected to the handle along its axis. The adjustment module connects the handle and the heat insulation tube and is used to adjust and fix the relative positions of the handle and the heat insulation tube.
[0006] The ablation needle has an insulated tube located inside the puncture tube and movably connected to a handle, allowing adjustment of the length of the ablation needle's working area. An adjustment module can fix the relative position of the handle and the insulated tube, thereby making the working area of the ablation needle more stable during use.
[0007] In another illustrative embodiment of the ablation needle, the handle has a cavity. An insulating tube is inserted into the cavity. The handle has a sliding hole that communicates with the cavity and extends axially along the insulating tube. An adjustment module is slidably inserted through the sliding hole. The portion of the adjustment module located within the cavity is fixedly connected to the insulating tube. The portion of the adjustment module located outside the handle is used to position the insulating tube relative to the handle. This structure is simple and convenient to operate.
[0008] In another illustrative embodiment of the ablation needle, the handle has several limiting grooves recessed into the wall of the sliding hole along the circumference of the insulation tube. These limiting grooves are distributed axially along the insulation tube. The insulation tube can rotate relative to the handle about its axis. The adjustment module can slide into the limiting grooves as the insulation tube rotates. The limiting grooves prevent the adjustment module from moving relative to the handle in a direction parallel to the axis of the insulation tube. This achieves the fixation of the axial position of the insulation tube.
[0009] In another illustrative embodiment of the ablation needle, the adjustment module includes a support block and an operating element. The support block is located in the cavity and fixedly sleeved on the insulation tube. The support block engages with the cavity wall to allow it to slide along the axial direction of the insulation tube within the cavity and rotate about the axis of the insulation tube within the cavity. The operating element passes through a sliding hole and is connected to the support block. By providing the support block, deformation of the internal tubing caused by improper force applied by the user during use can be prevented.
[0010] In another illustrative embodiment of the ablation needle, the handle has a cavity. An insulation tube is inserted into the cavity. The adjustment module includes an operating ring and a drive element. The operating ring is rotatably fitted onto the handle around the axis of the insulation tube. An operating port communicating with the cavity is opened on the portion of the handle opposite to the operating ring. The drive element is located in the cavity and fixedly fitted onto the insulation tube. The drive element passes through the operating port and forms a threaded connection with the inner surface of the operating ring, wherein the thread axis coincides with the axis of the insulation tube. Rotating the operating ring can thread-drive the drive element and drive the insulation tube. This structure allows for flexible adjustment of the position of the insulation tube.
[0011] In another illustrative embodiment of the ablation needle, the operating ring is made transparent so that the position of the actuator in the handle can be observed. This facilitates adjustment.
[0012] In another illustrative embodiment of the ablation needle, the handle includes a body and a rotating bearing. An insulating tube is movably inserted into the body along its axis and forms a clearance fit with the body. The outer ring of the rotating bearing is fixedly connected to the body, and the inner ring is fitted onto the insulating tube and conforms to the outer wall of the insulating tube. The fit between the inner ring of the rotating bearing and the insulating tube facilitates the alignment of the insulating tube's axis.
[0013] In another illustrative embodiment of the ablation needle, the main body includes a support, an insert, and a shell. Each of the two end faces of the support has a recessed mounting groove. An insulating tube is movably inserted through the support along its axis and into both mounting grooves. A rotating bearing is disposed within the mounting groove. The insert is embedded in the mounting groove to fix the position of the rotating bearing within the mounting groove. The shell is fitted over the outside of the support. This facilitates assembly.
[0014] In another illustrative embodiment of the ablation needle, the wall of the insulating tube is hollow to form a vacuum cavity for insulation. This facilitates achieving a better insulation effect.
[0015] In another illustrative embodiment of the ablation needle, the insulated tube and the puncture tube are coaxially arranged and form a gap fit. This ensures smooth relative sliding between the two while minimizing leakage of working fluid from the gap between them. Attached Figure Description
[0016] The following figures are for illustrative purposes only and do not limit the scope of the present invention.
[0017] Figure 1 This is a schematic diagram illustrating one embodiment of an ablation needle.
[0018] Figure 2 for Figure 1 A partial cross-sectional view of the ablation needle shown.
[0019] Figure 3 for Figure 2 Enlarged view of section III.
[0020] Figure 4 for Figure 2 Enlarged view of section IV.
[0021] Figure 5 for Figure 2 Enlarged view of section V.
[0022] Figure 6 This is a cross-sectional view illustrating another illustrative embodiment of the ablation needle.
[0023] Label Explanation
[0024] 10 handles
[0025] 11 cavities
[0026] 12 sliding holes
[0027] 13 limit slots
[0028] 14 Support sections
[0029] 15 operation port
[0030] 17 main bodies
[0031] 171 Support
[0032] C mounting slot
[0033] 172 inserts
[0034] 173 casing
[0035] 18 rotating bearings
[0036] 20 puncture tubes
[0037] 21 working terminals
[0038] 30 input tubes
[0039] 40 thermal insulation tube
[0040] 41 Vacuum Chamber
[0041] 50 Adjustment Module
[0042] 51 support blocks
[0043] 52 operating components
[0044] 53 Operating Ring
[0045] 54 drive components
[0046] The axis of the L-insulation pipe
[0047] A ablation needle working area Detailed Implementation
[0048] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments of the present utility model are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.
[0049] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.
[0050] To keep the drawings simple, each drawing only schematically shows the parts related to this utility model, and they do not represent the actual structure of the product.
[0051] Figure 1 This is a schematic diagram illustrating one embodiment of an ablation needle. Figure 2 for Figure 1 A partial cross-sectional view of the ablation needle shown. (As shown) Figure 1 and Figure 2 As shown, the ablation needle includes a handle 10, a puncture tube 20, an inlet tube 30, a heat insulation tube 40, and an adjustment module 50.
[0052] like Figure 1 As shown, one end of the puncture tube 20 (i.e. Figure 1 The lower end of the middle part is fixedly connected to the handle 10, and the other end (i.e. Figure 1 The upper end (of the device) is the working end 21 for inserting into the tissue and performing ablation. The end of the working end 21 is closed and pointed to facilitate tissue insertion. Figure 2 As shown, the input tube 30 is inserted into the puncture tube 20. The input tube 30 is used to input the working fluid required for ablation into the working end 21. After the working fluid reaches the working end 21, it absorbs / releases heat to achieve the ablation effect.
[0053] like Figure 2As shown, the heat insulation tube 40 is inserted into the puncture tube 20 and sleeved on the outside of the input tube 30. The heat insulation tube 40 is used to achieve internal and external heat insulation of the corresponding section of the puncture tube 20. The portion of the inner side of the working end 21 of the puncture tube 20 not covered by the heat insulation tube 40 forms the working area A of the ablation needle. In this illustrative embodiment, a tubular output channel is formed between the heat insulation tube 40 and the input tube 30 for outputting the working fluid, but it is not limited to this. In other illustrative embodiments, the ablation needle may also include an output tube arranged side by side with the input tube 30 and located inside the heat insulation tube 40 for outputting the working fluid.
[0054] In this illustrative embodiment, the insulation tube 40 and the puncture tube 20 are coaxially arranged and form a clearance fit, thereby ensuring smooth relative sliding between them and minimizing the leakage of working fluid from the gap between them. In fact, because the section of the insulation tube 40 and the puncture tube 20 forming the clearance fit is relatively long, it can almost completely prevent the working fluid from leaking out of the gap between them. Of course, lubricant can also be filled into the gap to further improve the sealing performance.
[0055] Figure 3 for Figure 2 Enlarged view of section III, as shown Figure 3 As shown in this illustrative embodiment, the wall of the insulating tube 40 is hollow to form a vacuum cavity 41 for heat insulation. The vacuum cavity 41 is in a near-vacuum state, which can achieve effective heat insulation. The insulating tube 40 is, for example, composed of two interlocking tubes connected at both ends with a sealed vacuum cavity 41 between the two tubes. However, it is not limited to this. In other illustrative embodiments, the insulating tube 40 may also be a single-layer tube made of insulating material.
[0056] The insulating tube 40 is movably connected to the handle 10 along its axis L, thereby allowing adjustment of the length of the working area A of the ablation needle. The adjustment module 50 connects the handle 10 and the insulating tube 40 and is used to adjust and fix the relative positions of the handle 10 and the insulating tube 40. Specifically, as... Figure 2 As shown, in this illustrative embodiment, the handle 10 has a cavity 11. The insulation tube 40 is inserted into the cavity 11. The handle 10 has a sliding hole 12 that communicates with the cavity 11 and extends axially along the insulation tube 40 (see also...). Figure 1 and Figure 2 The adjustment module 50 is slidably inserted through the sliding hole 12. The portion of the adjustment module 50 located in the cavity 11 is fixedly connected to the insulation tube 40. The portion of the adjustment module 50 located outside the handle 10 is used to position the insulation tube 40 relative to the handle 10. This structure is simple and easy to operate.
[0057] like Figure 1 and Figure 2As shown, in this illustrative embodiment, the handle 10 has 10 limiting grooves 13 recessed along the circumference of the insulation tube 40 on the wall of the sliding hole 12. Figure 1 and Figure 2 (Only one is schematically shown in the diagram). Ten limiting grooves 13 are distributed along the axial direction of the insulation tube 40 and located on both sides of the sliding hole 12. The insulation tube 40 can rotate relative to the handle 10 about its axis L. The adjustment module 50 can slide into the limiting groove 13 as the insulation tube 40 rotates. The limiting groove 13 can prevent the adjustment module 50, which has slid into it, from moving relative to the handle 10 in a direction parallel to the axis L of the insulation tube 40, thereby fixing the axial position of the insulation tube 40. In other illustrative embodiments, the number of limiting grooves 13 can be adjusted as needed, and they can be distributed on the same side of the sliding hole 12 or located on both sides of the sliding hole 12. In other illustrative embodiments, limiting grooves may not be provided, and the relative position of the handle 10 and the insulation tube 40 may be fixed by other means, such as, but not limited to, providing a snap-fit structure between the adjustment module 50 and the handle 10.
[0058] The insulated tube of the ablation needle is located inside the puncture tube and is movably connected to the handle, thereby allowing adjustment of the length of the working area of the ablation needle. The adjustment module 50 can fix the relative position of the handle 10 and the insulated tube 40, thereby making the working area of the ablation needle more stable during use.
[0059] like Figure 2 As shown, in this illustrative embodiment, the handle 10 has a support portion 14 on each side of the cavity 11 along the axial direction of the insulation tube 40. In this illustrative embodiment, the two support portions 14 are the two ends of the handle 10. The insulation tube 40 is movably inserted through the two support portions 14 along its axis L. The adjustment module 50 includes a support block 51 and an operating member 52. The support block 51 is located in the cavity 11 and fixedly sleeved on the insulation tube 40. The support block 51 cooperates with the cavity wall of the cavity 11 so that it can slide within the cavity 11 along the axial direction of the insulation tube 40 and rotate within the cavity 11 about the axis L of the insulation tube 40. The operating member 52 passes through the sliding hole 12 and is connected to the support block 51. By providing the support block, deformation of the internal pipeline caused by improper force applied by the user to the adjustment module during use can be prevented.
[0060] like Figure 2As shown in this illustrative embodiment, the handle 10 includes a main body 17 and two rotary bearings 18. A cavity 11 is disposed within the main body 17. An insulation tube 40 is movably inserted into the main body 17 along its axis L, forming a clearance fit with the main body 17. Each support portion 14 is provided with a rotary bearing 18. The outer ring of the rotary bearing 18 is fixedly connected to the main body 17, and the inner ring is fitted onto the insulation tube 40 and adheres to the outer wall of the insulation tube 40. The fit between the inner ring of the rotary bearing 18 and the insulation tube 40 facilitates the alignment of the insulation tube 40's axis. When the insulation tube 40 moves relative to the handle 10 along its axis L, sliding friction occurs between the inner ring of the rotary bearing 18 and the insulation tube 40. When the insulation tube 40 rotates relative to the handle 10 around its axis L, the inner ring of the rotary bearing 18 and the insulation tube 40 rotate synchronously under the action of static friction, which helps to improve the smoothness of rotation.
[0061] In other illustrative embodiments, the rotating bearing 18 can also be replaced by an O-ring, which fits or forms an interference fit with both the insulation tube 40 and the main body 17 to ensure that the axis of the insulation tube 40 is aligned.
[0062] Figure 4 for Figure 2 Enlarged view of part IV, Figure 5 for Figure 2 Enlarged view of section V. (Combined with...) Figure 2 , Figure 4 and Figure 5 In this illustrative embodiment, the main body 17 includes a support 171, two inserts 172, and a housing 173. Each of the two end faces of the support 171 has a recessed mounting groove C. The insulation tube 40 is movably inserted through the support 171 along its axis L and into the two mounting grooves C. A rotating bearing 18 is disposed within the mounting groove C. The inserts 172 are fitted into the mounting grooves C to fix the position of the rotating bearing 18 within the mounting grooves C. The housing 173 is fitted over the outside of the support 171. This facilitates assembly.
[0063] In an illustrative embodiment, the inlet tube 30 is fixed relative to the puncture tube 20, for example, by a connecting structure (not shown in the figure), but is not limited thereto. In other illustrative embodiments, the inlet tube 30 may also be fixed relative to the insulation tube 40, for example.
[0064] In this illustrative embodiment, the handle 10 is a straight handle, but it is not limited to this. In other illustrative embodiments, the handle may also be a right-angle handle, a bend handle (internal angle range of 30 to 150°), a handle with adjustable bending angle, etc.
[0065] Figure 6 This is a cross-sectional view illustrating another illustrative embodiment of the ablation needle. (See attached image.) Figure 6 As shown, with Figure 1Similar to the ablation needle shown, the ablation needle in this illustrative embodiment also includes a handle 10, a puncture tube 20, an input tube 30, a heat insulation tube 40, and an adjustment module 50. One end of the puncture tube 20 is fixedly connected to the handle 10, and the other end is a working end 21 for puncturing tissue and performing ablation. The input tube 30 is inserted into the puncture tube 20. The input tube 30 is used to input the working fluid required for ablation into the working end 21. The heat insulation tube 40 is inserted into the puncture tube 20 and sleeved on the outside of the input tube 30. The heat insulation tube 40 is used to achieve internal and external heat insulation in its corresponding puncture tube 20 segment. The heat insulation tube 40 is movably connected to the handle 10 along its axis L. The handle 10 has a cavity 11. The heat insulation tube 40 is inserted into the cavity 11.
[0066] like Figure 6 As shown in this illustrative embodiment, the adjustment module 50 includes an operating ring 53 and a driving member 54. The operating ring 53 is rotatably fitted onto the handle 10 about the axis L of the insulation tube 40. The portion of the handle 10 opposite to the operating ring 53 has an operating port 15 communicating with the cavity 11. The driving member 54 is located in the cavity 11 and fixedly fitted onto the insulation tube 40. The driving member 54 passes through the operating port 15 and forms a threaded connection with the inner surface of the operating ring 53, wherein the thread axis coincides with the axis L of the insulation tube 40. Rotating the operating ring 53 can thread-drive the driving member 54 and drive the insulation tube 40. Specifically, the inner surface of the operating ring 53 has an internal thread, and the driving member 54 has an external thread. The two are threadedly connected. When the operating ring 53 is rotated, the driving member 54 can be driven to move along the axis L relative to the handle 10, thereby driving the insulation tube 40 to move along its axis L relative to the handle 10. The structure allows for flexible adjustment of the position of the insulation tube 40, and the relative position of the insulation tube 40 and the handle 10 is fixed through a threaded connection structure. That is, the position of the insulation tube 40 can only be adjusted when the operating ring 53 is rotated.
[0067] In the illustrative embodiment, the operating ring 53 is made transparent so that the position of the drive member 54 in the handle 10 can be observed. This facilitates adjustment.
[0068] The ablation needle provided by this invention can be used as both a cryoablation device and a heat conduction ablation device. When used as a cryoablation device, it includes, but is not limited to, devices based on the Joule-Thomson principle and devices based on the liquid nitrogen delivery principle. When used as a heat conduction ablation device, it includes, but is not limited to, devices based on the water, water vapor, alcohol, and alcohol vapor delivery principles.
[0069] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0070] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent implementation schemes or modifications made without departing from the spirit of the present utility model, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present utility model.
Claims
1. An ablation needle, characterized in that, include: Handle (10); The puncture tube (20) has one end fixedly connected to the handle (10) and the other end is a working end (21) for puncturing tissue and performing ablation. An input tube (30) is inserted into the puncture tube (20), and the input tube (30) is used to input working fluid into the working end (21); A heat insulation tube (40) is inserted into the puncture tube (20) and sleeved on the outside of the input tube (30). The heat insulation tube (40) is used to achieve internal and external heat insulation in the corresponding section of the puncture tube (20). The heat insulation tube (40) is movably connected to the handle (10) along its axis (L). as well as An adjustment module (50) is connected to the handle (10) and the insulation tube (40) and is used to adjust and fix the relative positions of the handle (10) and the insulation tube (40).
2. The ablation needle as described in claim 1, characterized in that, The handle (10) has a cavity (11), the heat insulation tube (40) is inserted into the cavity (11), the handle (10) has a sliding hole (12) that communicates with the cavity (11) and extends along the axial direction of the heat insulation tube (40), the adjustment module (50) is slidably inserted through the sliding hole (12), the part of the adjustment module (50) located in the cavity (11) is fixedly connected to the heat insulation tube (40), and the part of the adjustment module (50) located outside the handle (10) is used to operate the heat insulation tube (40) to be positioned relative to the handle (10).
3. The ablation needle as described in claim 2, characterized in that, The handle (10) has several limiting grooves (13) recessed in the wall of the sliding hole (12) along the circumference of the insulation tube (40). The limiting grooves (13) are distributed along the axial direction of the insulation tube (40). The insulation tube (40) can rotate relative to the handle (10) about its axis (L). The adjustment module (50) can slide into the limiting groove (13) along with the rotation of the insulation tube (40). The limiting groove (13) can prevent the adjustment module (50) that has slid into it from moving relative to the handle (10) in a direction parallel to the axis (L) of the insulation tube (40).
4. The ablation needle as described in claim 2 or 3, characterized in that, The adjustment module (50) includes: A support block (51) is located in the cavity (11) and fixedly sleeved on the insulation tube (40). The support block (51) cooperates with the cavity wall of the cavity (11) so that it can slide along the axial direction of the insulation tube (40) in the cavity (11) and rotate about the axis (L) of the insulation tube (40) in the cavity (11); and An operating element (52) passes through the sliding hole (12) and is connected to the support block (51).
5. The ablation needle as described in claim 1, characterized in that, The handle (10) has a cavity (11), the heat insulation tube (40) is inserted into the cavity (11), and the adjustment module (50) includes: An operating ring (53) is rotatably fitted onto the handle (10) about the axis (L) of the insulation tube (40). The portion of the handle (10) opposite to the operating ring (53) has an operating port (15) communicating with the cavity (11). A driving member (54) is located in the cavity (11) and fixedly sleeved on the insulation tube (40). The driving member (54) passes through the operating port (15) and forms a threaded connection with the inner surface of the operating ring (53), wherein the thread axis coincides with the axis (L) of the insulation tube (40). Rotating the operating ring (53) can drive the driving member (54) and drive the insulation tube (40) threadedly.
6. The ablation needle as described in claim 5, characterized in that, The operating ring (53) is set to be transparent so that the position of the drive (54) in the handle (10) can be observed.
7. The ablation needle as described in claim 1, characterized in that, The handle (10) includes: The main body (17), wherein the heat insulation tube (40) is movably inserted into the main body (17) along its axis (L) and forms a clearance fit with the main body (17); and A rotating bearing (18) has its outer ring fixedly connected to the main body (17), and its inner ring is fitted onto the insulation tube (40) and is in contact with the outer wall of the insulation tube (40).
8. The ablation needle as described in claim 7, characterized in that, The main body (17) includes: The support body (171) has a mounting groove (C) recessed on each of its two end faces. The heat insulation tube (40) is movably inserted through the support body (171) along its axis (L) and passes through the two mounting grooves (C). The rotating bearing (18) is disposed in the mounting groove (C). An insert (172) is fitted into the mounting groove (C) to fix the position of the rotary bearing (18) in the mounting groove (C); and The outer shell (173) is fitted over the outside of the support (171).
9. The ablation needle as described in claim 1, characterized in that, The wall of the insulation tube (40) is hollow to form a vacuum cavity (41) for insulation.
10. The ablation needle as described in claim 1, characterized in that, The insulation tube (40) and the puncture tube (20) are coaxially arranged and form a gap fit.
Citation Information
Cited By
Ablation needle and ablation system
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