Radio frequency ablation instrument

Abstract

The utility model provides a radiofrequency ablation instrument which comprises an electrode base body, a first electrode, a second electrode, a third electrode and a fourth electrode. The handle is connected with the electrode base body, and the handle can rotate; the bending control assembly is arranged on the handle and is connected with the deformation part; when the handle rotates, the bending control assembly can be driven to rotate, and the bending control assembly drives the deformation part to bend. According to the radiofrequency ablation instrument, the bending amplitude of the deformation part can be controlled by rotating the handle, so that the position of the deformation part can be adjusted according to different patients, the matching degree of different patients is improved, the treatment effect is improved, and the operation risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a radiofrequency ablation instrument. Background Technology

[0002] The therapeutic mechanism of radiofrequency ablation is primarily based on thermal effects. When radiofrequency current flows through human tissue, the rapid changes in the electromagnetic field cause polarized water molecules within the tissue to move at high speeds, generating heat and thus achieving thermal coagulation or neuromodulation of the organ tissue. The electrodes are the core component of the radiofrequency ablation instrument because they directly affect the size and shape of the coagulated necrosis. The ideal coagulation zone should be spherical or oblate. Under the guidance of ultrasound or CT, multiple electrodes are directly inserted into the diseased tissue. The electrodes can raise the tissue temperature to above 60°C, causing cell death and creating a necrotic area. If the local tissue temperature exceeds 90°C, coagulative necrosis will occur directly. In areas with temperatures between 40-60°C, the normal physiological functions of most cells will be temporarily affected, but their functions will return to normal after treatment.

[0003] Current mainstream radiofrequency ablation devices employ a uniform and broad ablation method, and the relative positions of ablation points are fixed and cannot be adjusted intraoperatively. Due to individual differences, the treatment effect is not ideal. For example, the distribution of target ablation nerves in the sacral foramen varies from patient to patient. Using current radiofrequency ablation devices to treat different patients may result in incomplete ablation, i.e., the ablation area is too small, requiring adjustment of electrode positions and multiple ablations, which increases the operation time. Alternatively, over-ablation may occur, damaging non-target tissues, both of which increase the surgical risk. Utility Model Content

[0004] The purpose of this invention is to provide a radiofrequency ablation instrument with a deformable part that can change shape, thereby improving the matching degree for different patients and reducing the risk of surgery.

[0005] To achieve the above objectives, in a first aspect, this utility model provides a radiofrequency ablation instrument, comprising:

[0006] An electrode substrate has a deformable portion and a straight portion, wherein the deformable portion is used for tissue ablation;

[0007] A handle is connected to the electrode substrate, and the handle is rotatable.

[0008] A bending control assembly is disposed on the handle and connected to the deformation part;

[0009] When the handle is rotated, it can drive the bending control component to rotate, and the bending control component causes the deformable part to bend.

[0010] In some embodiments, the bending control assembly includes a traction rope and a fixed shaft;

[0011] The fixed shaft is fixedly connected to the handle;

[0012] The proximal end of the traction rope is connected to the fixed shaft, and the distal end of the traction rope is connected to the distal end of the deformable part.

[0013] When the handle is turned to wind the traction rope around the fixed shaft, the traction rope provides tension to the deformable part, thereby causing the deformable part to bend.

[0014] In some embodiments, the electrode substrate has a first channel along its axial direction, the distal end of the first channel extends to the distal end of the deformed portion, and the proximal end of the first channel conducts through the proximal end of the electrode substrate.

[0015] The traction rope is threaded through the first channel, and the distal end of the traction rope is fixedly connected to the distal inner wall of the first channel.

[0016] In some embodiments, the electrode substrate has a second channel along its axial direction, and an electrode needle is disposed in the second channel;

[0017] The sidewall of the deformable part is provided with a plurality of spaced slots along its axial direction. The slots are connected to the second channel to expose part of the electrode needle.

[0018] In some embodiments, the handle includes an electrode head and a rotating component;

[0019] The rotating component is rotatably disposed on the electrode head and cooperates with the electrode head to form a receiving cavity;

[0020] The proximal end of the electrode substrate is fixedly connected to the electrode head;

[0021] The fixed shaft is located inside the receiving cavity and is fixedly connected to the rotating component.

[0022] In some embodiments, the proximal end of the electrode head has a hollow rotating shaft, and the sidewall of the rotating shaft is provided with a raised limiting step in annular shape.

[0023] The distal end face of the rotating component is provided with a receiving groove, and the inner sidewall of the receiving groove is provided with an annular limiting groove.

[0024] The rotating shaft is rotatably embedded in the receiving groove, and the limiting step cooperates with the limiting groove.

[0025] In some embodiments, a limiting cavity is formed inside the electrode head, the limiting cavity being close to the distal end of the electrode head and communicating with the rotation shaft;

[0026] The electrode substrate has a limiting portion at its proximal end, which is located within the limiting cavity to fix the electrode substrate to the electrode head.

[0027] In some embodiments, the electrode head is provided with a wire hole, which communicates with the limiting cavity;

[0028] The proximal end of the electrode needle located within the electrode substrate is electrically connected to an external radio frequency host through the wire hole.

[0029] In some embodiments, the fixed shaft has a connecting portion, a first disc portion, and a second disc portion;

[0030] The first disc portion and the second disc portion are spaced apart, with the first disc portion located at the far end of the fixed shaft, and the connecting portion connected to the second disc portion;

[0031] The connecting part is fixedly connected to the handle;

[0032] The proximal end of the traction rope is located between the first coil and the second coil.

[0033] In some embodiments, a through hole is provided on the surface of the first disk portion;

[0034] The traction rope passes through the through hole and connects to the deformable part.

[0035] In some embodiments, the handle further includes a locking element;

[0036] The locking element is located between the electrode head and the rotating element, and is used to lock the electrode head and the rotating element.

[0037] In some embodiments, the locking element is an elastic element, which is sleeved on the rotating shaft, and the two ends of the elastic element abut against the electrode head and the rotating element, respectively.

[0038] In some embodiments, a support member is further provided in the electrode substrate along its axial direction, the support member providing a resilient force to the electrode substrate;

[0039] When the bending control component removes its force on the electrode substrate, the support member drives the deformed part to reset.

[0040] The beneficial effects of the radiofrequency ablation instrument provided by this utility model are as follows:

[0041] 1. The bending range of the deformable part can be controlled by rotating the handle, so that the deformable part can adjust its position according to different patients, thereby improving the matching degree of different patients, improving the treatment effect, and reducing the risk of surgery. Attached Figure Description

[0042] Figure 1 A schematic diagram of the structure of the radiofrequency ablation instrument provided in the embodiments of this utility model;

[0043] Figure 2 A schematic diagram of the structure of the radiofrequency ablation instrument after adjusting the curvature of the deformed part, as provided in the embodiment of this utility model;

[0044] Figure 3 This is a schematic diagram of the bending control component provided in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of the electrode substrate provided in the embodiment of this utility model;

[0046] Figure 5 A schematic diagram of the electrode head structure and a cross-sectional view of the electrode head along AA are provided for embodiments of this utility model;

[0047] Figure 6 A schematic diagram of the rotating component and a cross-sectional view of the rotating component along BB are provided for embodiments of this utility model.

[0048] Figure 7 This is a structural schematic diagram of the fixed shaft provided in an embodiment of the present invention.

[0049] Figure label:

[0050] Electrode substrate 1, deformable part 11, straight part 12, first channel 13, second channel 14, third channel 15, slot 16, limiting part 17, tip structure 18, handle 2, electrode head 21, rotating shaft 211, limiting step 212, limiting cavity 213, wire hole 214, opening 215, rotating part 22, receiving groove 221, limiting groove 222, insertion groove 223, locking part 23, bending control assembly 3, traction rope 31, fixed shaft 32, connecting part 321, first disc part 322, second disc part 323, through hole 324, connecting hole 325. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects. Unless otherwise specified, the term "connection" as used herein can refer to a direct connection or an indirect connection, i.e., a connection through an intermediate object.

[0052] Furthermore, it should be understood that the orientations or positional relationships indicated by terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" in this document are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first" and "second" in this document are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0053] In this text, the term "distal" refers to the end that is farther from the operator and closer to the patient; the term "proximal" refers to the end that is closer to the operator and farther from the patient.

[0054] To address the problems existing in the prior art, embodiments of this utility model provide a radiofrequency ablation instrument, referencing... Figures 1 to 4 As shown, the radiofrequency ablation instrument includes an electrode substrate 1, a handle 2, and a bending control assembly 3. The electrode substrate 1 has a deformable portion 11 and a straight portion 12. The deformable portion 11 is located in the distal region of the electrode substrate 1, and the straight portion 12 is located in the proximal region of the electrode substrate 1. The deformable portion 11 is made of a material with a certain deformation capacity, thus it can bend under stress. The deformable portion 11 can be used for tissue ablation. The handle 2 is fixedly connected to the electrode substrate 1 and is rotatable. The bending control assembly 3 is disposed on the handle 2 and connected to the deformable portion 11, and the bending control assembly 3 can rotate together with the handle 2.

[0055] Therefore, when the handle 2 rotates, it can drive the bending control component 3 to rotate. During the rotation of the bending control component 3, it will provide a pulling force to the deformable part 11, thereby causing the deformable part 11 to bend, such as... Figure 2 As shown, this approach allows for matching different patients, improving the efficiency of tissue ablation, reducing surgical risks, and increasing treatment effectiveness.

[0056] In this embodiment, the electrode substrate 1 is made of a non-metallic material, such as polyetheretherketone (PEEK) high-strength engineering plastic. The electrode substrate 1, formed using a non-metallic material, does not require an insulating plating treatment, making it safer and more reliable. Of course, in some embodiments, the electrode substrate 1 can also be formed using other insulating materials, which will not be described in detail here. Furthermore, the distal end of the electrode substrate 1 is provided with a pointed structure 18 to facilitate the insertion of the electrode substrate 1 into human tissue.

[0057] refer to Figures 1 to 3 As shown, in some embodiments, the bending control assembly 3 includes a traction rope 31 and a fixed shaft 32. The fixed shaft 32 is fixedly connected to the handle 2 and can rotate with the handle 2. The proximal end of the traction rope 31 is connected to the fixed shaft 32, and the distal end of the traction rope 31 is connected to the distal end of the deformation part 11.

[0058] In this embodiment, when the handle 2 is rotated to drive the fixed shaft 32 to rotate, the traction rope 31 will wrap around the fixed shaft 32, shortening the length of the traction rope 31. This allows the traction rope 31 to provide tension to the deformable part 11, thereby causing the deformable part 11 to bend. It is understood that the degree of bending of the deformable part 11 will vary with the number of rotations, improving the matching degree for different individuals.

[0059] refer to Figure 3 and Figure 4 As shown, in some embodiments, the electrode substrate 1 has a first channel 13 along its axial direction, the distal end of the first channel 13 extends to the distal end of the deformable part 11, the proximal end of the first channel 13 conducts through the proximal end face of the electrode substrate 1, the traction rope 31 passes through the first channel 13, and the distal end of the traction rope 31 is fixedly connected to the distal inner wall of the first channel 13.

[0060] In this embodiment, by opening the first channel 13 in the electrode substrate 1 and placing the traction rope 31 in the first channel 13, the reliability of the traction rope 31 pulling the deformable part 11 to bend is ensured.

[0061] refer to Figure 4As shown, in some embodiments, the electrode substrate 1 has a second channel 14 formed along its axial direction. The second channel 14 is independently arranged from the first channel 13, and an electrode needle is disposed within the second channel 14. The sidewall of the deformable portion 11 has a plurality of spaced slots 16 formed along its axial direction. The slots 16 are connected to the second channel 14, providing space for bending of the deformable portion 11 and thus adjusting its curvature. Furthermore, the slots 16 expose part of the electrode needle, forming a plurality of arrayed electrode points on the surface of the electrode substrate 1. When the deformable portion 11 bends, the distance between adjacent slots 16 changes, thereby altering the position of adjacent electrode points to suit different patients.

[0062] In some embodiments, the number of slots 16 is N, where 20 ≥ N ≥ 2. It can be understood that setting the number of slots 16 is equivalent to providing the number of electrode points. In this embodiment, the number of slots 16 is set to 10. Of course, in some embodiments, the number of slots 16 can be set to 5, 7, 13, 15, or 18, depending on actual market demand.

[0063] refer to Figures 3 to 6 As shown, in some embodiments, the handle 2 includes an electrode head 21 and a rotating member 22. The rotating member 22 is rotatably disposed on the electrode head 21 and cooperates with the electrode head 21 to form a receiving cavity. The proximal end of the electrode base 1 is fixedly connected to the electrode head 21. The fixed shaft 32 is located within the receiving cavity and is fixedly connected to the rotating member 22. When the rotating member 22 rotates, it can drive the fixed shaft 32 to rotate.

[0064] In some embodiments, the proximal end of the electrode head 21 has a hollow rotating shaft 211, and the sidewall of the rotating shaft 211 is provided with a raised limiting step 212. The distal end face of the rotating member 22 has a receiving groove 221, and the inner sidewall of the receiving groove 221 has an annular limiting groove 222. The inner diameter of the limiting groove 222 is larger than the inner diameter of the receiving groove 221. The rotating shaft 211 is rotatably fitted into the receiving groove 221, and the limiting step 212 cooperates with the limiting groove 222, thereby defining the positional relationship between the electrode head 21 and the rotating member 22.

[0065] In this embodiment, to facilitate the insertion and engagement between the rotating shaft 211 and the receiving groove 221, an opening 215 is provided at the proximal end of the rotating shaft 211. When the rotating shaft 211 is inserted into the receiving groove 221, the diameter of the rotating shaft 211 can be appropriately reduced due to the presence of the opening 215, avoiding interference between the limiting step 212 and the inner wall of the receiving groove 221, thereby improving the ease of assembly between the electrode head 21 and the rotating component 22.

[0066] refer to Figure 1 As shown, in some embodiments, the handle 2 further includes a locking member 23, which is disposed between the electrode head 21 and the rotating member 22, for locking the electrode head 21 and the rotating member 22.

[0067] In this embodiment, by providing the locking member 23, the rotating member 22 is prevented from automatically rotating back after rotation, thus avoiding changes in the curvature of the deformable part 11 after bending and improving the stability of the deformable part 11 after bending deformation. In addition, by providing the locking member 23 to lock the electrode head 21 and the rotating member 22, it is also convenient for the operator to use, avoiding continuous force on the handle 2 and improving the ease of operation.

[0068] In some specific embodiments, the locking member 23 is an elastic member, preferably an elastic member with a high coefficient of friction. The elastic member is sleeved on the rotating shaft 211, and the two ends of the elastic member abut against the electrode head 21 and the rotating member 22 respectively. It can be understood that when the rotating member 22 is rotated, the force required is greater than the frictional force between the rotating member 22 and the elastic member.

[0069] In this embodiment, the elastic element is an elastic collar with a high coefficient of friction. After the electrode head 21 is assembled with the rotating member 22, it will squeeze the elastic element. The elastic element will generate elastic force after being squeezed. This elastic force will be applied to the electrode head 21 and the rotating member 22, thereby increasing the frictional force in the contact area between the elastic element and the rotating member 22, and restricting the rotating member 22 from rotating on its own without external force.

[0070] refer to Figures 3 to 6 As shown, in some embodiments, a limiting cavity 213 is formed within the electrode head 21. The limiting cavity 213 is located near the distal end of the electrode head 21 and communicates with the rotating shaft 211. The limiting cavity 213 is a cylindrical cavity. The proximal end of the electrode base 1 has a limiting portion 17, which is disposed within the limiting cavity 213 and engages with the limiting cavity 213 to fix the electrode base 1 to the electrode head 21.

[0071] In some embodiments, the electrode head 21 has a wire hole 214, which communicates with the limiting cavity 213. The proximal end of the electrode needle extends from the limiting portion 17 and is electrically connected to an external radio frequency host through the wire hole 214.

[0072] In some embodiments, a third channel 15 is further provided in the electrode substrate 1 along its axial direction. The third channel 15 is independently provided with the first channel 13 and the second channel 14. A support member is provided in the third channel 15. The support member provides a restoring force to the electrode substrate 1. When the bending control component 3 removes the force on the electrode substrate 1, the support member drives the deformed part 11 to reset.

[0073] In this embodiment, the support is a highly elastic metal sheet, which ensures that the electrode substrate 1 has sufficient rebound tendency and bending strength while the deformable part 11 is stretched and deformed, thereby ensuring the reliability of the radiofrequency ablation instrument for different patients.

[0074] refer to Figure 3 and Figure 7 As shown, in some embodiments, the fixed shaft 32 has a connecting portion 321, a first disc portion 322, and a second disc portion 323, the first disc portion 322 and the second disc portion 323 being spaced apart, and the first disc portion 322 being located at the distal end of the fixed shaft 32. The connecting portion 321 is connected to the second disc portion 323, and the connecting portion 321 is fixedly connected to the handle 2. The proximal end of the traction rope 31 is located between the first disc portion 322 and the second disc portion 323.

[0075] In this embodiment, the receiving groove 221 has a "D"-shaped insertion groove 223, and the connecting part 321 has a "D"-shaped columnar structure. The connecting part 321 is interference-fitted with the insertion groove 223. The area between the first disc portion 322 and the second disc portion 323 is used for winding the traction rope 31, and the first disc portion 322 and the second disc portion 323 limit the winding of the traction rope 31 to prevent the traction rope 31 from detaching from the fixed shaft 32.

[0076] In some embodiments, a through hole 324 is provided on the surface of the first disc portion 322, and the traction rope 31 passes through the through hole 324 and connects to the deformation portion 11.

[0077] In this embodiment, by opening the through hole 324 on the first disc portion 322, the traction rope 31 can extend from the fixed shaft 32 into the first channel 13, and the internal interference between the traction rope 31 and the handle 2 is avoided, so as not to affect the traction effect of the traction rope 31 on the deformable part 11.

[0078] In some embodiments, a connecting hole 325 is provided on the fixed shaft 32, the connecting hole 325 is located between the first disc portion 322 and the second disc portion 323, and the proximal end of the traction rope 31 is fixedly connected to the connecting hole 325.

[0079] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A radiofrequency ablation instrument, characterized in that, include: An electrode substrate has a deformable portion and a straight portion, wherein the deformable portion is used for tissue ablation; A handle is connected to the electrode substrate, and the handle is rotatable. A bending control assembly is disposed on the handle and connected to the deformation part; When the handle is rotated, it can drive the bending control assembly to rotate, and the bending control assembly drives the deformable part to bend; The electrode substrate has a second channel along its axial direction, and an electrode needle is provided in the second channel; The sidewall of the deformable part is provided with a plurality of spaced slots along its axial direction. The slots are connected to the second channel to expose part of the electrode needle.

2. The radiofrequency ablation instrument according to claim 1, characterized in that, The bending control assembly includes a traction rope and a fixed shaft; The fixed shaft is fixedly connected to the handle; The proximal end of the traction rope is connected to the fixed shaft, and the distal end of the traction rope is connected to the distal end of the deformable part. When the handle is turned to wind the traction rope around the fixed shaft, the traction rope provides tension to the deformable part, thereby causing the deformable part to bend.

3. The radiofrequency ablation instrument according to claim 2, characterized in that, The electrode substrate has a first channel along its axial direction, the distal end of the first channel extends to the distal end of the deformed part, and the proximal end of the first channel conducts through the proximal end of the electrode substrate. The traction rope is threaded through the first channel, and the distal end of the traction rope is fixedly connected to the distal inner wall of the first channel.

4. The radiofrequency ablation instrument according to claim 2 or 3, characterized in that, The handle includes an electrode head and a rotating component; The rotating component is rotatably disposed on the electrode head and cooperates with the electrode head to form a receiving cavity; The proximal end of the electrode substrate is fixedly connected to the electrode head; The fixed shaft is located inside the receiving cavity and is fixedly connected to the rotating component.

5. The radiofrequency ablation instrument according to claim 4, characterized in that, The proximal end of the electrode head has a hollow rotating shaft, and the side wall of the rotating shaft is provided with a raised limiting step in annular shape. The distal end face of the rotating component is provided with a receiving groove, and the inner sidewall of the receiving groove is provided with an annular limiting groove. The rotating shaft is rotatably embedded in the receiving groove, and the limiting step cooperates with the limiting groove.

6. The radiofrequency ablation instrument according to claim 5, characterized in that, A limiting cavity is formed inside the electrode head, and the limiting cavity is close to the far end of the electrode head and communicates with the rotating shaft; The electrode substrate has a limiting portion at its proximal end, which is located within the limiting cavity to fix the electrode substrate to the electrode head.

7. The radiofrequency ablation instrument according to claim 6, characterized in that, The electrode head has a wire hole, which communicates with the limiting cavity; The proximal end of the electrode needle located within the electrode substrate is electrically connected to an external radio frequency host through the wire hole.

8. The radiofrequency ablation instrument according to claim 4, characterized in that, The fixed shaft has a connecting part, a first disc part, and a second disc part; The first disc portion and the second disc portion are spaced apart, with the first disc portion located at the far end of the fixed shaft, and the connecting portion connected to the second disc portion; The connecting part is fixedly connected to the handle; The proximal end of the traction rope is located between the first coil and the second coil.

9. The radiofrequency ablation instrument according to claim 8, characterized in that, The first disk has through holes on its surface; The traction rope passes through the through hole and connects to the deformable part.

10. The radiofrequency ablation device according to any one of claims 6 to 9, characterized in that, The handle also includes a locking element; The locking element is located between the electrode head and the rotating element, and is used to lock the electrode head and the rotating element.

11. The radiofrequency ablation device according to claim 10, characterized in that, The locking element is an elastic element, which is sleeved on the rotating shaft, and the two ends of the elastic element respectively abut against the electrode head and the rotating element.

12. The radiofrequency ablation instrument according to claim 1, characterized in that, The electrode substrate is further provided with a support member along its axial direction, and the support member provides a restoring force to the electrode substrate; When the bending control component removes its force on the electrode substrate, the support member drives the deformed part to reset.

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