Sub-needle expansion structure of radiofrequency ablation needle and radiofrequency ablation needle

Abstract

The present invention relates to a sub-needle expansion structure of a radiofrequency ablation needle and a radiofrequency ablation needle, and relates to the field of ablation technology. The sub-needle expansion structure of the radiofrequency ablation needle of the present invention includes a sub-needle driving mechanism and a sub-needle anti-bending mechanism. Since the sub-needle anti-bending mechanism can adjust its position following the movement of the sub-needle bundle, the sub-needle anti-bending mechanism can always be located at the middle position of the segmented sub-needle bundle, thereby providing support and restraint to the segmented sub-needle bundle at the middle position of the segmented sub-needle bundle, and avoiding the bending phenomenon of the sub-needle bundle.

Description

Technical Field

[0001] The present invention relates to the field of ablation technology, and particularly to a sub-needle expansion structure of a radiofrequency ablation needle and a radiofrequency ablation needle. Background Art

[0002] During the ablation operation using a radiofrequency ablation needle, usually, according to the specific shape of the tumor, the degree of expansion of the sub-needles of the ablation needle is adjusted, or several sub-needles are selectively expanded. The sub-needles generally penetrate out of the housing of the main needle and expand in the circumferential direction of the main needle. In order to prevent blood from flowing back into the housing after puncture, the sub-needles need to pass through a sealing structure such as a sealing ring in the housing. However, there is a large frictional resistance between such a sealing structure and the sub-needles. When the diameter of the sub-needles is small and the length is large, during the movement of the sub-needles, it is extremely easy to cause the sub-needles to bend, which will undoubtedly have an adverse impact on the effect of tumor ablation treatment, thereby reducing the accuracy and effectiveness of the treatment. Summary of the Invention

[0003] The present invention provides a sub-needle expansion structure of a radiofrequency ablation needle and a radiofrequency ablation needle for solving at least one of the above technical problems.

[0004] The present invention provides a sub-needle expansion structure of a radiofrequency ablation needle, including:

[0005] A sub-needle driving mechanism, connected to a sub-needle bundle of the radiofrequency ablation needle, a part of the sub-needle bundle between the sub-needle driving mechanism and the distal fixing part of the radiofrequency ablation needle is a segmented sub-needle bundle with variable length, and the sub-needle driving mechanism drives the sub-needle bundle to move through the distal fixing part for expansion or retract from the distal fixing part; and

[0006] A sub-needle anti-bending mechanism, located between the sub-needle driving mechanism and the distal fixing part, and connected to the sub-needle driving mechanism, the sub-needle anti-bending mechanism can adjust its position following the movement of the sub-needle bundle, and provide support and restraint for the segmented sub-needle bundle.

[0007] In one embodiment, when the sub-needle anti-bending mechanism adjusts its position following the movement of the sub-needle bundle, the sub-needle anti-bending mechanism is always located at the middle position of the segmented sub-needle bundle, so as to provide support and restraint for the segmented sub-needle bundle.

[0008] In one embodiment, the sub-needle anti-bending mechanism includes:

[0009] A moving and adjusting member, one end of which abuts against the outer wall of the segmented sub-needle bundle; and

[0010] A series spring group is connected to the moving adjustment member. The series spring group is also respectively connected to the distal fixing portion and the sub-needle driving mechanism. When the sub-needle driving mechanism drives the sub-needle bundle to move, the series spring group can adjust the position of the moving adjustment member so that it is always located at the middle position of the segmented sub-needle bundle.

[0011] In one embodiment, the series spring group includes springs respectively located on opposite sides of the moving adjustment member. The springs on both sides are respectively in abutment with both sides of the moving adjustment member. One end of the spring on one side is fixedly connected to the sub-needle driving mechanism, and one end of the spring on the other side is fixedly connected to the distal fixing portion.

[0012] In one embodiment, the sub-needle anti-bending mechanism includes one or both of a first guide rod and a second guide rod extending along the moving direction of the sub-needle bundle. The series spring group is wound around the first guide rod or the second guide rod, and the first guide rod and / or the second guide rod respectively penetrate through the moving adjustment member and the sub-needle driving mechanism.

[0013] In one embodiment, the moving adjustment member includes a pressing plate and an abutting portion. The first guide rod and / or the second guide rod respectively penetrate through the pressing plate. One end of the abutting portion is connected to the pressing plate, and the other end abuts against the outer wall of the segmented sub-needle bundle.

[0014] In one embodiment, the proximal end of the sub-needle bundle is in communication with a sub-needle infusion tube, and the sub-needle infusion tube is spirally wound around the first guide rod or the second guide rod.

[0015] In one embodiment, the number of the sub-needle bundles is one or more. When the number of the sub-needle bundles is multiple, the multiple sub-needle bundles are sequentially arranged along the circumferential direction of the main needle assembly of the radiofrequency ablation needle; and each sub-needle bundle corresponds to one sub-needle driving mechanism and the sub-needle anti-bending mechanism.

[0016] In one embodiment, the sub-needle bundle includes a sub-needle cannula and a capillary tube. The sub-needle cannula covers a part of the capillary tube. An arc-shaped recessed portion is provided on one side of the sub-needle cannula close to the main needle assembly. The arc-shaped recessed portion is configured to be recessed towards the inside of the sub-needle cannula and extend along the axial direction of the sub-needle cannula.

[0017] In one embodiment, the number of the capillary tubes is one or more, and at least one sub-needle temperature detection portion is provided at the distal end of each capillary tube.

[0018] The present invention also provides a radiofrequency ablation needle, which includes the sub-needle expansion structure of the radiofrequency ablation needle described above, and further includes a housing mechanism, a sub-needle bundle, and a main needle assembly. The sub-needle bundle is arranged on the circumferential side of the main needle assembly, and the proximal sides of the sub-needle bundle and the main needle assembly are both arranged in the housing mechanism. The distal fixing portion is configured as a radial baffle located inside the housing mechanism.

[0019] Compared with the prior art, the advantages of the present invention are that since the sub-needle anti-bending mechanism can adjust its position following the movement of the sub-needle bundle, the sub-needle anti-bending mechanism can always provide support and restraint to the segmented sub-needle bundle by changing its position. Therefore, when the sub-needle bundle expands from the distal fixing portion, since the segmented sub-needle bundle is always supported and restrained by the sub-needle anti-bending mechanism, it can be ensured that the sub-needle bundle is exhibited in a predetermined form, avoiding the bending phenomenon when the sub-needle bundle is exhibited. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the drawings.

[0021] Figure 1 is a schematic structural diagram of the sub-needle expansion structure of the radiofrequency ablation needle in Embodiment 1 of the present invention;

[0022] Figure 2 is a schematic structural diagram of the sub-needle anti-bending mechanism in Embodiment 1 of the present invention, showing the state where the sub-needle bundle is not unfolded;

[0023] Figure 3 is a schematic structural diagram of the sub-needle anti-bending mechanism in Embodiment 1 of the present invention, showing the state where a part of the sub-needle bundle is unfolded;

[0024] Figure 4 is a schematic structural diagram of the sub-needle anti-bending mechanism in Embodiment 1 of the present invention, showing the state where the sub-needle bundle is fully unfolded;

[0025] Figure 5 is a force diagram of equivalent beam structure of the sub-needle bundle;

[0026] Figure 6 is Figure 5 the shown bending moment diagram;

[0027] Figure 7 is an equivalent simplified diagram of the series spring group;

[0028] Figure 8 is Figure 1 the three-dimensional structural schematic diagram of the shown sub-needle anti-bending mechanism;

[0029] Figure 9 is Figure 8 the three-dimensional structural schematic diagram of the shown moving adjustment member;

[0030] Figure 10 is Figure 1 an enlarged view of the sub-needle anti-bending mechanism shown;

[0031] Figure 11 is a schematic structural diagram of multiple sub-needle bundles of the radiofrequency ablation needle in Embodiment 1 of the present invention;

[0032] Figure 12 is Figure 11 the front view of one of the sub-needle bundles shown;

[0033] Figure 13 is Figure 12 the side view of the sub-needle bundle shown;

[0034] Figure 14 is Figure 13 an enlarged view of the position A shown;

[0035] Figure 15 is a cross-sectional view of the tip position of the sub-needle bundle;

[0036] Figure 16 is a schematic diagram of the installation of the sub-needle driving mechanism in the housing mechanism in Embodiment 2 of the present invention;

[0037] Figure 17 is a three-dimensional structural diagram of the sub-needle driving mechanism in Embodiment 2 of the present invention;

[0038] Figure 18 is Figure 17 the three-dimensional structural diagram of the push button slider group shown;

[0039] Figure 19 is Figure 18 the three-dimensional structural diagram of the push button slider group shown, in which a stop block is hidden;

[0040] Figure 20a is Figure 18 the three-dimensional structural diagram of the push button slider group shown, in which a stop block and a ball are hidden;

[0041] Figure 20b is Figure 18 the three-dimensional structural diagram of the push button slider group shown, in which two stop blocks and a ball are hidden;

[0042] Figure 20c is Figure 18 the three-dimensional structural diagram of the push button slider group shown, in which the connection between the slider and the sub-needle bundle is shown;

[0043] Figure 21 is Figure 18 the cross-sectional view of the push button slider group shown;

[0044] Figure 22 isFigure 18 Schematic perspective view of the shown stopper

[0045] Figure 23 is Figure 18 Schematic perspective view of the shown push button slider group, in which the slider, the first link and the push button are hidden

[0046] Figure 24 is Figure 17 Schematic perspective view of the shown second sliding sleeve

[0047] Figure 25 is Figure 17 Side view of the shown second sliding sleeve

[0048] Figure 26 is Figure 17 Schematic perspective view of the shown first sliding sleeve

[0049] Figure 27 is Figure 17 Side view of the shown first sliding sleeve

[0050] Figure 28 Front view after installation of the housing mechanism in Embodiment 3 of the present invention

[0051] Figure 29 Side view after installation of the housing mechanism in Embodiment 3 of the present invention

[0052] Figure 30 is Figure 28 Enlarged view at B

[0053] Figure 31 is Figure 29 Enlarged view at A

[0054] Figure 32 is Figure 28 Front view of the shown housing mechanism

[0055] Figure 33 is Figure 28 Top view of the shown housing mechanism

[0056] Figure 34 is Figure 28 Schematic perspective view of the shown housing mechanism with one housing hidden

[0057] Figure 35 is Figure 28 Exploded view of the shown housing mechanism

[0058] Figure 36 Front view after installation of the housing mechanism in Embodiment 3 of the present invention, showing the third winding state of the sub-needle infusion tube

[0059] Figure 37 is the front view after the installation of the housing mechanism in Embodiment 3 of the present invention, which shows the first winding state, the second winding state, and the third winding state of the sub-needle injection tube;

[0060] Figure 38 is the side view in Embodiment 3 of the present invention where the exhibition radius of some sub-needle bundles is R1 and the exhibition radius of some sub-needle bundles is R2;

[0061] Figure 39 is the front view in Embodiment 3 of the present invention where the exhibition radius of some sub-needle bundles is R1 and the exhibition radius of some sub-needle bundles is R2;

[0062] Figure 40 is the side view in Embodiment 3 of the present invention where the exhibition radius of all sub-needle bundles is R2;

[0063] Figure 41 is the front view in Embodiment 3 of the present invention where the exhibition radius of all sub-needle bundles is R2;

[0064] Figure 42a is Figure 41 the enlarged view at C;

[0065] Figure 42b is Figure 41 the three-dimensional structural schematic diagram of the shown sub-needle exhibition outlet;

[0066] Figure 43 is Figure 34 the three-dimensional structural schematic diagram of the shown knob mechanism;

[0067] Figure 44 is Figure 43 the three-dimensional structural schematic diagram of the shown barrel;

[0068] Figure 45 is Figure 35 the three-dimensional structural schematic diagram of the shown lead screw;

[0069] Figure 46 is Figure 35 the cross-sectional view of the shown knob mechanism;

[0070] Figure 47 is the three-dimensional structural schematic diagram of the lead screw installation in Embodiment 3 of the present invention;

[0071] Figure 48 is the axial cross-sectional view after the installation of the lead screw in Embodiment 3 of the present invention;

[0072] Figure 49 is the radial cross-sectional view after the installation of the lead screw in Embodiment 3 of the present invention;

[0073] Figure 50 is Figure 49The cross-sectional view of the housing mechanism with the lead screw hidden, in which the first housing is hidden;

[0074] Figure 51 is Figure 50 the cross-sectional view of the second housing shown;

[0075] Figure 52 the front view of the liquid injection adjustment mechanism in Embodiment 4 of the present invention;

[0076] Figure 53 is Figure 52 the cross-sectional view at E-E;

[0077] Figure 54 the side view of the liquid injection adjustment mechanism in Embodiment 4 of the present invention;

[0078] Figure 55 is Figure 52 the front view of the valve body shown;

[0079] Figure 56 is Figure 55 the cross-sectional view at F-F;

[0080] Figure 57 is Figure 52 the three-dimensional structural schematic diagram of the roller shown;

[0081] Figure 58 is Figure 56 the enlarged view at G

[0082] Figure 59 is Figure 52 the three-dimensional structural schematic diagram of the valve body shown.

[0083] Reference numerals:

[0084] 10, sub-needle driving mechanism; 11, sub-needle anti-bending mechanism; 12, distal fixing part; 13, sealing mechanism;

[0085] 111, moving adjustment part; 112, series spring group; 113, first guide rod; 114, second guide rod; 115, flange;

[0086] 1111, pressing plate; 1112, abutting part; 1113, groove; 1114, first mounting hole; 1115, second mounting hole;

[0087] 1121, spring;

[0088] 121, first card slot; 122, second card slot;

[0089] 131, pressure pad; 132, sealing ring;

[0090] 210, sub-needle bundle; 211, segmented sub-needle bundle;

[0091] 201, Sub-needle cannula; 202, Capillary tube; 203, Sub-needle temperature detection part; 204, Process hole;

[0092] 2011, Arc-shaped recessed part; 2012, Arc-shaped raised part; 2013, Bending part;

[0093] 2, Needle device; 100, Housing mechanism; 101, First housing; 102, Second housing; 103, Third housing; 104, Fourth housing; 108, Flange; 1021, Engaging part;

[0094] 220, Main needle assembly;

[0095] 6, Sub-needle liquid injection tube; 601, First winding state of sub-needle liquid injection tube; 602, Second winding state of sub-needle liquid injection tube; 603, Third winding state of sub-needle liquid injection tube;

[0096] 106, Pushing button slider assembly; 1061, Pushing button; 1062, Slider; 1063, First connecting rod; 1064, Stop block; 1065, Ball; 1066, First guide rod hole; 1067, Second guide rod hole;

[0097] 10621, Ball groove; 10622, Sub-needle bundle mating groove; 10623, First groove; 10624, Second groove; 10625, Ball hole;

[0098] 10641, First stop block connecting column; 10642, Second stop block connecting column;

[0099] 107, Slide sleeve; 1072, Second slide sleeve; 1073, First slide sleeve; 1071, Slideway;

[0100] 10721, Mounting column; 10731, Slider mounting groove; 10732, Ball groove;

[0101] 3, Main needle liquid injection tube; 4, Liquid injection adjustment mechanism; 5, Cable; 7, Control mechanism;

[0102] 105, Knob mechanism; 110, Lead screw; 1011, First housing chute; 1012, Knob chute; 1013, Window; 1014, First marking layer; 1015, Second marking layer; 1016, Scale line layer; 1017, Second housing chute;

[0103] 2201, Outer needle rod; 2202, Main needle; 2203, Main needle tip; 2204, Sub-needle outlet; 2031, Main needle temperature detection part; 2032, Main needle liquid injection hole; 2025, First baffle; 2026, Second baffle; 2027, Connecting baffle;

[0104] 1091, lead screw hole; 1092, needle tool hole;

[0105] 20251, arc segment; 20252, flat segment; 20261, needle tool groove;

[0106] 1051, toggle button; 1052, toggle cylinder; 1053, internal thread; 1054, second connecting rod;

[0107] 1101, platform; 1102, outer needle rod connecting hole; 1103, external thread; 1104, connecting part;

[0108] 701, indicator light;

[0109] 401, regulating valve; 402, liquid outlet pipe; 403, liquid inlet pipe; 404, roller;

[0110] 4011, third marking layer; 4012, roller installation groove; 4013, tooth groove track; 4014, shunt port; 4015, liquid inlet port; 4016, fourth marking layer; 4017, parallel plane; 4018, inclined plane; 4010, installation surface;

[0111] 4019, tooth groove; 4021, first joint; 4031, second joint; 4041, first hob; 4042, second hob. Detailed implementation mode

[0112] The present invention will be further described below with reference to the accompanying drawings.

[0113] Example 1

[0114] As Figures 1 - 15 shown, the present invention provides a sub-needle expansion structure for a radiofrequency ablation needle, which is used to expand or deploy the sub-needle or sub-needle bundle 210 of the radiofrequency ablation needle in the circumferential direction of the main needle assembly 220 of the radiofrequency ablation needle. Therefore, the ablation method of the radiofrequency ablation needle is more diversified. For example, it can be ablation by combining the main needle assembly 220 with the deployed sub-needle bundle 210, or ablation by the deployed sub-needle bundle 210 and other various methods, so as to realize conformal ablation according to the shape of the tumor.

[0115] As Figure 1 shown, the sub-needle expansion structure of the present invention includes a sub-needle driving mechanism 10 and a sub-needle anti-bending mechanism 11. The sub-needle driving mechanism 10 is connected to the sub-needle bundle 210 of the radiofrequency ablation needle. The part of the sub-needle bundle 210 between the sub-needle driving mechanism 10 and the distal fixing part 12 of the radiofrequency ablation needle is a length-variable segmented sub-needle bundle 211. The sub-needle driving mechanism 10 can drive the sub-needle bundle 210 to move through the distal fixing part 12 so as to expand in the circumferential direction of the main needle assembly 220 or retract from the distal fixing part 12.

[0116] The segmented sub-needle bundle 211 is actually a part of the sub-needle bundle 210. For the sake of easy understanding, the part located between the sub-needle driving mechanism 10 and the distal fixing part 12 of the radiofrequency ablation needle is called the segmented sub-needle bundle 211. Since the sub-needle bundle 210 will be driven by the sub-needle driving mechanism 10 to move, the length of the segmented sub-needle bundle 211, which is the part where it is connected to the sub-needle driving mechanism 10 and the part where the sub-needle bundle 210 passes through the distal fixing part 12, is variable. For example, in Figure 2 the shown state, the sub-needle bundle 210 is in the retracted state, and at this time the length of the segmented sub-needle bundle 211 is 2L0; in Figure 3 the shown state, the sub-needle bundle 210 is driven by the sub-needle driving mechanism 10 to move a certain distance in the direction close to the distal fixing part 12 (please refer to Figure 1 and Figure 34 ), and unfolds to a certain extent in the circumferential direction of the main needle assembly 220. At this time, the length of the segmented sub-needle bundle 211 is 2L1; in Figure 4 the shown state, the sub-needle bundle 210 is driven by the sub-needle driving mechanism 10 to continue to move a certain distance in the direction close to the distal fixing part 12 (please refer to Figure 1 and Figure 34 ), and unfolds completely in the circumferential direction of the main needle assembly 220. At this time, the length of the segmented sub-needle bundle 211 is 2L2.

[0117] The sub-needle anti-bending mechanism 11 is located between the sub-needle driving mechanism 10 and the distal fixing part 12, and is connected to the sub-needle driving mechanism 10. The sub-needle anti-bending mechanism 11 can adjust its position following the movement of the sub-needle bundle 210, so that the sub-needle anti-bending mechanism 11 can always provide support and restraint to the segmented sub-needle bundle 211. When the sub-needle bundle 210 expands from the distal fixing part 12, since the segmented sub-needle bundle 211 is always supported and restrained by the sub-needle anti-bending mechanism 11, the sub-needle bundle 210 can be ensured to be exhibited in a predetermined form, avoiding the bending phenomenon when the sub-needle bundle 210 is exhibited.

[0118] Furthermore, the sub-needle anti-bending mechanism 11 can adjust its position following the movement of the sub-needle bundle 210, whereby the sub-needle anti-bending mechanism 11 can always be located at the middle position of the segmented sub-needle bundle 211, so as to provide support and restraint to the segmented sub-needle bundle 211 at its middle position. This is because during the process of the sub-needle driving mechanism 10 pushing the sub-needle bundle 210 to move, one end of the sub-needle bundle 210 is subject to the thrust of the sub-needle driving mechanism 10, and the other end of the sub-needle bundle 210 needs to pass through the distal fixing part 12, so it will be subject to frictional resistance. Since the two external forces of the thrust and frictional resistance received at both ends of the sub-needle bundle 210 are not collinear, a couple will be generated, and the center of action of the couple can be regarded as being located at the middle position of the segmented sub-needle bundle 211 between the sub-needle driving mechanism 10 and the distal fixing part 12 of the radiofrequency ablation needle. This segmented sub-needle bundle 211 can be regarded as a beam structure with one end fixed and restrained and the other end freely supported in static mechanics, as Figure 5 shown; there is a couple moment M at the midpoint position of this beam structure. From Figure 6 the bending moment diagram shown, it can be obtained that the bending moment received at the midpoint of this beam structure (i.e., the segmented sub-needle bundle 211) is the largest, and the maximum value is M / 2.

[0119] Therefore, according to Figure 5 and Figure 6 the force analysis, it can be known that the bending moment received at the midpoint of the segmented sub-needle bundle 211 is the largest and the risk of bending is the highest. Therefore, the sub-needle anti-bending mechanism 11 must always be located at the midpoint of this segmented sub-needle bundle 211 to achieve the effect of preventing the segmented sub-needle bundle 211 from bending.

[0120] Furthermore, since the degree to which the sub-needle bundle 210 unfolds in the circumferential direction of the main needle assembly 220 can be different, that is, the length of the segmented sub-needle bundle 211 is a variable length, the present invention ensures that the sub-needle anti-bending mechanism 11 is always located at the midpoint of this segmented sub-needle bundle 211 by means of a series spring.

[0121] Specifically, the sub-needle anti-bending mechanism 11 includes a moving adjustment member 111 and a series spring group 112. One end of the moving adjustment member 111 abuts against the outer wall of the segmented sub-needle bundle 211. The series spring group 112 is connected to the moving adjustment member 111, and the series spring group 112 is also respectively connected to the distal fixing part 12 and the sub-needle driving mechanism 10. When the sub-needle driving mechanism 10 drives the sub-needle bundle 210 to move, the series spring group 112 can adjust the position of the moving adjustment member 111 to make it always located at the middle position of the segmented sub-needle bundle 211.

[0122] Among them, the series spring group 112 includes springs 1121 respectively located on opposite sides of the moving adjustment member 111 and respectively abutting against both sides of the moving adjustment member 111. The materials, wire diameters, number of turns, and free lengths of the springs 1121 respectively located on opposite sides of the moving adjustment member 111 are the same. One end of the spring 1121 located on one side of the moving adjustment member 111 is fixedly connected to the sub-needle driving mechanism 10, and one end of the spring 1121 located on the other side of the moving adjustment member 111 is fixedly connected to the distal fixed portion 12.

[0123] As Figure 7 shown is a simplified schematic diagram of the series spring group 112. Among them, two springs in the series spring group 112 are in series. One end of one spring is fixed, and one end of the other spring is subjected to an external force F (this external force F is applied by the sub-needle driving mechanism 10). The deformation coefficient of one spring is K1, and the deformation amount is ΔX1; the deformation coefficient of the other spring is K2, and the deformation amount is ΔX2. It can be known from Hooke's law and the series spring group formula that: the elastic force of each section of spring in the series spring group is equal to the magnitude of the external force applied, that is, F = K1 * ΔX1 = K2 * ΔX2 = Kn * ΔXn.

[0124] If springs with the same material, wire diameter, number of turns, and free length are selected, the deformation coefficients K1 = K2 = Kn can be obtained, and the free lengths X1 = X2 = Xn. Further, it can be concluded that: under the same external force F, the deformation amounts are equal, that is, ΔX1 = ΔX2 = ΔXn.

[0125] Therefore, by selecting two springs with the same parameters in the series spring group 112, it can be ensured that when the sub-needle driving mechanism 10 is at any position, the deformation amounts of the two springs are equal, and the moving adjustment member 111 between the two springs will always be at the midpoint of this segmented sub-needle bundle 211, so as to support and restrain this segmented sub-needle bundle 211 at the midpoint position of this segmented sub-needle bundle 211, so as to avoid the phenomenon of bending or curving of this segmented sub-needle bundle 211.

[0126] Furthermore, the sub-needle anti-bending mechanism 11 further includes one or both of a first guide rod 113 and a second guide rod 114 extending along the moving direction of the sub-needle bundle 210. The series spring group 112 is wound around the first guide rod 113 or the second guide rod 114, and the first guide rod 113 and / or the second guide rod 114 respectively penetrate through the moving adjustment member 111 and the sub-needle driving mechanism 10.

[0127] As Figure 8In the illustrated embodiment, the sub-needle anti-bending mechanism 11 includes a first guide rod 113 and a second guide rod 114 extending along the moving direction of the sub-needle bundle 210. The series spring group 112 is wound around the second guide rod 114, and the first guide rod 113 and the second guide rod 114 respectively penetrate through the moving adjustment member 111 and the sub-needle driving mechanism 10. Therefore, on the one hand, the first guide rod 113 and the second guide rod 114 can provide a guiding effect in the moving direction of the sub-needle bundle 210, that is, the sub-needle driving mechanism 10 can move along the first guide rod 113 and the second guide rod 114; on the other hand, although the moving adjustment member 111 is free in the axial direction of the first guide rod 113 and the second guide rod 114, due to the supporting effect of the first guide rod 113 and the second guide rod 114, the moving adjustment member 111 can provide support and restraint to the segmented sub-needle bundle 211 in the radial direction, preventing the segmented sub-needle bundle 211 from bending at its middle position when subjected to the thrust of the sub-needle driving mechanism 10 and the frictional resistance of the distal fixing portion 12.

[0128] Please continue to refer to Figure 2 , when the sub-needle driving mechanism 10 does not move, the sub-needle bundle 210 is in the retracted state. At this time, the length of the segmented sub-needle bundle 211 is 2L0, the springs 1121 on both sides of the moving adjustment member 111 are in the free state, and the moving adjustment member 111 naturally locates at the middle position of the segmented sub-needle bundle 211; as Figure 3 shown, when the sub-needle driving mechanism 10 moves, it drives the sub-needle bundle 210 to move a certain distance. At this time, the sub-needle bundle 210 unfolds to a certain extent in the circumferential direction of the main needle assembly 220 (please refer to the description in the following text Figure 38 , the unfolding diameter of one sub-needle bundle 210 is R1), at this time the length of the segmented sub-needle bundle 211 is 2L1, the springs 1121 on both sides of the moving adjustment member 111 are respectively compressed by the acting force, thereby pushing the moving adjustment member 111 to adjust its position along the axial direction of the first guide rod 113 and the second guide rod 114, so that the moving adjustment member 111 is located at the middle position of the segmented sub-needle bundle 211; as Figure 4 shown, when the sub-needle driving mechanism 10 moves to the maximum displacement position, it drives the sub-needle bundle 210 to continue moving. At this time, the sub-needle bundle 210 unfolds to the maximum extent in the circumferential direction of the main needle assembly 220 (please refer to the description in the following text Figure 38 And Figure 39 , the unfolding diameters of all sub-needle bundles 210 are R2, where R1 < R2), at this time the length of the segmented sub-needle bundle 211 is 2L2, the springs 1121 on both sides of the moving adjustment member 111 are respectively compressed by the acting force and further compressed, thereby pushing the moving adjustment member 111 to continue adjusting its position along the axial direction of the first guide rod 113 and the second guide rod 114, so that the moving adjustment member 111 is located at the middle position of the segmented sub-needle bundle 211.

[0129] Therefore, the present invention uses the moving adjusting member 111 and the springs 1121 which are exactly the same on both sides thereof to ensure that the moving adjusting member 111 can always support and restrain the middle position of the segmented sub-needle bundle 211, thereby avoiding the phenomenon that the sub-needle bundle 210 bends.

[0130] As Figure 8 shown, the moving adjusting member 111 includes a pressing plate 1111 and an abutting portion 1112. The first guide rod 113 and the second guide rod 114 respectively penetrate through the pressing plate 1111. One end of the abutting portion 1112 is connected to the pressing plate 1111, and the other end of the abutting portion 1112 abuts against the outer wall of the segmented sub-needle bundle 211. Since the end of the abutting portion 1112 is used to abut against the outer wall of the segmented sub-needle bundle 211, a groove 1113 adapted to the segmented sub-needle bundle 211 can be provided at the end of the abutting portion 1112. The groove 1113 has the same contour line as the segmented sub-needle bundle 211, so that it can provide support in the radial direction and can move freely in the axial direction.

[0131] As Figure 9 shown, the pressing plate 1111 is configured as a long strip-shaped plate structure, and a first mounting hole 1114 and a second mounting hole 1115 are respectively provided thereon. The first mounting hole 1114 and the second mounting hole 1115 are respectively used for the first guide rod 113 and the second guide rod 114 to penetrate through. The inner diameter of the first mounting hole 1114 is the same as the outer diameter of the first guide rod 113 (or the inner diameter of the first mounting hole 1114 is slightly larger than the outer diameter of the first guide rod 113), and the inner diameter of the second mounting hole 1115 is the same as the outer diameter of the second guide rod 114 (or the inner diameter of the second mounting hole 1115 is slightly larger than the outer diameter of the second guide rod 114), so that the pressing plate 1111 can move freely along the axial directions of the first guide rod 113 and the second guide rod 114 under the action of the springs 1121 on both sides thereof to adjust its position, and can also play a role in supporting and restraining in the radial direction.

[0132] Please refer to Figure 9 and Figure 10 , the abutting portion 1112 is connected to the end of the pressing plate 1111, for example, it can be connected by the rod-shaped structure shown in the figure. The abutting portion 1112 is configured as an arc-shaped plate structure, and a groove 1113 is provided at the end thereof far from the pressing plate 1111. The groove 1113 is configured as an arc-shaped groove, and it has the same contour line as the segmented sub-needle bundle 211, so that it can fit smoothly with the outer wall of the segmented sub-needle bundle 211.

[0133] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 10, the radiofrequency ablation needle has a housing mechanism 100 to accommodate the proximal part (i.e., the part away from the needle tip) of the sub-needle bundle 210 and the main needle assembly 220. A distal fixing part 12 is provided at the distal end of the housing mechanism 100, a flange 108 is provided at the proximal end of the housing mechanism 100, and the first guide rod 113 and the second guide rod 114 extend between the distal fixing part 12 and the flange 108 respectively. As Figure 10 shown, and in combination with Figure 11 , the distal fixing part 12 is configured as a radial baffle located inside the housing mechanism 100, and is provided with a first card slot 121 and a second card slot 122 thereon. Among them, the first end of the first guide rod 113 and the first end of the second guide rod 114 are respectively clamped in the first card slot 121 and the second card slot 122; similarly, the flange 108 is also provided with structures such as card slots or connection holes, etc., so as to be connected to the second ends of the first guide rod 113 and the second guide rod 114. Therefore, the first guide rod 113 and the second guide rod 114 can be fixed between the distal fixing part 12 and the flange 108. It should be noted that since the sub-needle injection tube 6 can also be wound around the second guide rod 114, the length of the second guide rod 114 is longer than that of the first guide rod 113. Correspondingly, the number of flanges 108 is two, and one of them is closer to the distal fixing part 12, so as to be fixedly connected to the second end of the first guide rod 113.

[0134] Please combine Figure 1 , Figure 10 and Figure 11 , and as described below Figure 30 , the sub-needle expansion structure of the radiofrequency ablation needle of the present invention further includes a sealing mechanism 13 located at the distal fixing part 12. The sealing mechanism 13 includes a pressure pad 131 and a sealing ring 132. The pressure pad 131 can fix the sealing ring 132 on the distal fixing part 12, and the sub-needle bundle 210 passes through the pressure pad 131 and the sealing ring 132 in sequence.

[0135] When the sub-needle bundle 210 is deployed, it moves relative to the main needle assembly 220 and is deployed through the sub-needle outlet 2204 of the main needle assembly 220. Therefore, in order to prevent blood from flowing back from the sub-needle outlet 2204 of the main needle assembly 220 into the housing mechanism 100 after the sub-needle bundle 210 and / or the main needle assembly 220 are inserted into the tissue, a sealing mechanism 13 is provided at the position where the sub-needle bundle and the main needle assembly 220 move relative to each other, and the sealing mechanism 13 is fixed to the distal fixing part 12. The sub-needle bundle 210 passes through the pressure pad 131 and the sealing ring 132 in this way, then the pressure pad 131 and the sealing ring 132 will form a frictional resistance with the sub-needle bundle 210, and the sub-needle anti-bending mechanism 11 described above is used to prevent the sub-needle bundle 210 from bending.

[0136] The number of sub-needle bundles 210 can be one or more. When the number of sub-needle bundles 210 is multiple, since each sub-needle bundle 210 needs to achieve independent liquid injection, each sub-needle bundle 210 needs to be connected to a sub-needle liquid injection tube 6. Moreover, the extension or retraction of each sub-needle bundle 210 will drive the corresponding change in the shape of the sub-needle liquid injection tube 6, resulting in a relatively messy layout of multiple sub-needle liquid injection tubes 6 within the housing mechanism 100 and possible interference between them. Therefore, to avoid the above situation, as Figure 2 、 Figure 3 and Figure 4 shown, the sub-needle liquid injection tube 6 is spirally coiled around the first guide rod 113 or the second guide rod 114. As Figure 2 shown, at this time, the sub-needle bundle 210 is not extended, so the sub-needle liquid injection tube 6 is wound around the second guide rod 114 in a fully compressed manner, presenting the first winding state 601 of the sub-needle liquid injection tube; as Figure 3 shown, the sub-needle bundle 210 is extended to a certain extent, so the sub-needle liquid injection tube 6 is stretched as the sub-needle bundle 210 moves, presenting the second winding state 602 of the sub-needle liquid injection tube; as Figure 4 shown, the sub-needle bundle 210 is fully extended, so the sub-needle liquid injection tube 6 is further stretched to the maximum extension state as the sub-needle bundle 210 moves, presenting the third winding state 603 of the sub-needle liquid injection tube. Therefore, each sub-needle liquid injection tube 6 is compressed or stretched on the second guide rod 114 corresponding to each sub-needle bundle 210, so that the movement between each sub-needle liquid injection tube 6 is relatively independent, avoiding the phenomenon of interfering with each other.

[0137] One end of the sub-needle liquid injection tube 6 is in fluid communication with the sub-needle bundle 210, and the other end of the sub-needle liquid injection tube 6 can input medicaments such as normal saline, injection anesthetic, and alcohol. The distal end (i.e., the end where the needle tip is located) of the sub-needle bundle 210 can be provided with sub-needle liquid injection holes, so that the above-mentioned medicaments can be injected into the ablation area to expand the ablation range or provide corresponding functions according to clinical needs.

[0138] As described above, the number of sub-needle bundles 210 can be multiple, and multiple sub-needle bundles 210 are sequentially arranged along the circumferential direction of the main needle assembly 220 of the radiofrequency ablation needle. In the embodiment shown as Figure 11 shown, four sub-needle bundles 210 are shown, and the four sub-needle bundles 210 are respectively and equally spaced around the circumference of the main needle assembly 220. Each sub-needle bundle 210 corresponds to a sub-needle driving mechanism 10 and a sub-needle anti-bending mechanism 11, so that the extension degree of each sub-needle bundle 210 can be controlled separately, and anti-bending protection can be provided for each sub-needle bundle 210 separately.

[0139] As Figure 12 、 Figure 13 、 Figure 14 、and Figure 15As shown, the sub-needle bundle 210 includes a sub-needle cannula 201 and a capillary 202. The sub-needle cannula 201 covers a part of the capillary 202. Therefore, it can be known that when the sub-needle bundle 210 is exhibited, the part of the capillary 202 that is not covered by the sub-needle cannula 201 is exhibited through the sub-needle outlet 2204 of the main needle assembly 220. The sub-needle cannula 201 can integrate the capillary 202 and enhance the strength of the capillary 202. Please continue to refer to Figure 12 , a plurality of process holes 204 are sequentially arranged along the axial direction of the sub-needle cannula 201. The process holes 204 are respectively used for welding or bonding between the capillaries 202. Therefore, the sub-needle cannula 201 eliminates tooling such as sub-needle cluster tooling and welding tooling, and can achieve one-stop forming. The specific quantity and size of the process holes 204 can be set according to actual requirements.

[0140] As Figure 13 and Figure 14 shown, the cross-section of the sub-needle cannula 201 is an arc-shaped cross-section. An arc-shaped recess 2011 is provided on the side thereof close to the main needle assembly 220 (please refer to Figure 11 ). Since the sub-needle bundle 210 is arranged circumferentially around the main needle assembly 220, the arc-shaped recess 2011 on the sub-needle cannula 201 is beneficial to form a passage for the main needle assembly 220 to pass through.

[0141] On the side of the sub-needle cannula 201 away from the main needle assembly 220, there is correspondingly an arc-shaped convex portion 2012. Its outer contour can match the outer contour of the groove 1113 on the abutting portion 1112 described above, that is, the groove 1113 on the abutting portion 1112 abuts against the arc-shaped convex portion 2012 of the sub-needle cannula 201.

[0142] The capillary 202 can be a stainless-steel capillary. As Figure 12 shown, the number of the capillaries 202 can be one or more. As Figure 15 shown, at least one sub-needle temperature detection portion 203 is provided at the distal end of each capillary 202. The sub-needle temperature detection portion 203 can be a temperature measuring device such as a temperature sensor or a thermocouple. The sub-needle temperature detection portion 203 is used to monitor the tissue temperature at each sub-needle bundle 210.

[0143] In addition, a main-needle temperature detection portion 2031 (such as a sensor or a thermocouple, etc., refer to Figure 38 - 4 2) is also provided on the main needle assembly 220, which is used to monitor the tissue temperature at the main needle assembly 220. The main-needle temperature detection portion 2031 and the sub-needle temperature detection portion 203 can be used in cooperation with an ablation instrument to realize arbitrary switching of the main control area, so as to use the position of this temperature detection portion as the main ablation area.

[0144] The maximum diameter of the exhibited sub-needle bundle 210 is 40 mm. If a plurality of sub-needle bundles 210 are all deployed (please refer to Figure 40 andFigure 41 If there are 4 sub-needle bundles as shown, the maximum ablation diameter of the radiofrequency ablation needle can reach 80 mm.

[0145] The present invention also provides a radiofrequency ablation needle, which includes a sub-needle expansion structure of the radiofrequency ablation needle, and further includes a housing mechanism 100, a sub-needle bundle 210, and a main needle assembly 220. The sub-needle bundle 210 is arranged on the circumferential side of the main needle assembly 220. The proximal sides of the sub-needle bundle 210 and the main needle assembly 220 are both arranged in the housing mechanism 100, and the distal fixing part 12 is configured as a radial baffle located inside the housing mechanism 100.

[0146] Example 2

[0147] As Figures 16 - 27 shown, the present invention provides a sub-needle driving mechanism for a radiofrequency ablation needle, which is used to drive the sub-needles or the sub-needle bundle 210 of the radiofrequency ablation needle to expand or unfold circumferentially on the main needle assembly 220 of the radiofrequency ablation needle. The sub-needle driving mechanism in Embodiment 2 can be used in combination with the sub-needle expansion structure of the radiofrequency ablation needle described in Embodiment 1 above, or can be used alone.

[0148] As Figure 16 shown, the radiofrequency ablation needle has a housing mechanism 100 and a needle tool 2, wherein the needle tool 2 includes a sub-needle bundle 210 and a main needle assembly 220. The sub-needle driving mechanism 10 includes a push button slider assembly 106, which can push the sub-needle bundle 210 to move along its axial direction.

[0149] The number of the sub-needle bundles 210 can be one or more. For example, when the number of the sub-needle bundles 210 is multiple, in order to achieve individual control of each sub-needle bundle 210, a plurality of sub-needle driving mechanisms 10 are correspondingly arranged. For example Figure 16 in the illustrated embodiment, if there are four sub-needle bundles 210, four sub-needle driving mechanisms 10 are correspondingly arranged. The sub-needle driving mechanisms 10 can be installed through the housing mechanism 100. For the convenience of installation, the housing mechanism 100 is set as a split structure including a plurality of housings, such as a first housing 101, a second housing 102, a third housing 103, and a fourth housing 104, wherein each housing corresponds to a sub-needle driving mechanism 10 respectively.

[0150] As Figures 17 - 27 shown, a plurality of push button slider assemblies 106 can be respectively installed in the sliding sleeve 107 and move in the sliding sleeve 107.

[0151] As Figure 18 shown, the push button slider assembly 106 includes a slider 1062. Please combine Figure 10, One end of the slider 1062 is connected to the sub-needle bundle 210. A first guide rod hole 1066 and a second guide rod hole 1067 are respectively provided on the slider 1062. A first guide rod 113 and a second guide rod 114 are respectively and penetratingly provided in the first guide rod hole 1066 and the second guide rod hole 1067. Therefore, the slider 1062 can move along the axial directions of the first guide rod 113 and the second guide rod 114.

[0152] Further, each slider 1062 is respectively installed in the sliding sleeve 107. Since the axial movement distance of each slider 1062 is relatively long, the sliding sleeve 107 is set as a split structure, that is, the sliding sleeve 107 may include a first sliding sleeve 1073 and a second sliding sleeve 1072 that are detachably connected. Among them, slider installation grooves 10731 for moving each slider 1062 are respectively provided in the first sliding sleeve 1073 and the second sliding sleeve 1072. As Figure 24 , Figure 25 , Figure 26 and Figure 27 shown, the number of slider installation grooves 10731 in the first sliding sleeve 1073 and the number of slider installation grooves 10731 in the second sliding sleeve 1072 both correspond one-to-one with the number of sliders 1062. Each slider 1062 moves in the corresponding slider installation groove 10731 of the first sliding sleeve 1073 and the second sliding sleeve 1072.

[0153] As Figure 19 and Figure 20a shown, the slider 1062 can be constructed as a sector structure, for example, its central angle can be 30° - 180°. It is convenient to integrate multiple sliders 1062 in the cylindrical sliding sleeve 107, and the movement between each slider 1062 does not interfere with each other. Correspondingly, each slider installation groove 10731 can also be constructed as a sector groove.

[0154] It can be understood that the central angle of the slider 1062 is related to the number of sliders 1062 n For example, Figure 20a shown, the central angle of the slider 1062 is 45°, which can correspond to four sliders 1062.

[0155] As Figure 19 and Figure 20a shown, a ball groove 10621 is provided on the slider 1062. The push button slider assembly 106 further includes a ball 1065 located in the ball groove 10621. The ball 1065 can improve the smoothness of the relative movement between the outer wall of each slider 1062 and the inner wall of the corresponding slider installation groove 10731.

[0156] Two symmetric ball grooves 10621 can be provided on the slider 1062, so that the two side walls of the slider 1062 can form a ball pair connection with the inner wall of the corresponding slider installation groove 10731.

[0157] As Figure 20b shown, the ball groove 10621 includes a first groove 10623 on one of the side walls of the slider 1062, second grooves 10624 on two opposite sector surfaces of the slider 1062 respectively, and a ball hole 10625 penetrating through two opposite sector surfaces of the slider 1062; please refer to Figure 23 . The number of the balls 1065 is multiple, and each ball 1065 is sequentially arranged in the first groove 10623, the second groove 10624 and the ball hole 10625 to form an annular structure. As Figure 19 shown, the groove width or groove depth of the first groove 10623 and the second groove 10624 is less than the diameter of the ball. For example, it can be equal to half of the ball diameter, so a part of the balls in the first groove 10623 and the second groove 10624 is exposed outside. The inner diameter of the ball hole 10625 can be the same as the diameter of the ball, so that the ball can roll in the ball hole 10625.

[0158] The slider 1062 is further provided with a first guide rod hole 1066 and a second guide rod hole 1067 respectively, which penetrate through two opposite sector surfaces of the slider 1062 and are respectively used for threading the first guide rod 113 and the second guide rod 114 described above.

[0159] Furthermore, the push button slider assembly 106 further includes stoppers 1064 respectively connected to two opposite sector surfaces of the slider 1062, and each stopper 1064 can be detachably or fixedly connected to the slider 1062. As Figure 21 , Figure 22 and Figure 23 shown, the stopper 1064 is provided with a first stopper connection post 10641 and a second stopper connection post 10642, which are inserted into the slider 1062 and connected to the slider 1062. The first guide rod hole 1066 and the second guide rod hole 1067 on the slider 1062 can extend to penetrate through the first stopper connection post 10641 and the second stopper connection post 10642 respectively.

[0160] In addition, the stopper 1064 can also be provided with a ball groove 10621. It can be understood that during the movement of the slider 1062, the balls installed in the ball hole 10625 can transition to the first groove 10623 on the slider 1062 at the ball groove 10621 on the stopper 1064, or transition from the first groove 10623 on the slider 1062 to the ball groove 10621 on the stopper 1064, and then transition to the ball hole 10625, thereby realizing rolling connection.

[0161] The push-button slider assembly 106 further includes a first connecting rod 1063 connected to the slider 1062 and a push button 1061 connected to the first connecting rod 1063. The push button 1061 can be located outside the sliding sleeve 107, facilitating the operator to apply force through the push button 1061. The first connecting rod 1063 can be located in the slideway 1071 on the sliding sleeve 107 to impose certain constraints on its movement.

[0162] Further, as Figure 20a shown, an end of the slider 1062 far from the push button 1061 is provided with a sub-needle bundle fitting groove 10622, which is configured as an arc-shaped groove. As Figure 20c shown, the sub-needle bundle fitting groove 10622 has the same outer contour line as the sub-needle sleeve 201 of the sub-needle bundle 210 described above. Therefore, it can ensure that the slider 1062 better fits and is welded or bonded to the sub-needle sleeve 201, so as to better apply force to the sub-needle sleeve 201 to drive its movement.

[0163] It should be noted that after each sub-needle bundle 210 passes through the sealing mechanism 13, they will respectively surround the circumference of the main needle assembly 220. Therefore, each sub-needle bundle 210 is provided with a bending portion 2013 that is radially bent towards the main needle assembly 220 at the connection with the slider 1062, so that the intervals between the sub-needle bundles 210 are larger when they do not surround the main needle assembly 220, and the intervals are smaller after passing through the sealing mechanism 13, thereby making the overall diameter of the needle device 2 smaller.

[0164] As Figure 17 shown, the sliding sleeve 107 includes a first sliding sleeve 1073 and a second sliding sleeve 1072 that are detachably connected. Please refer to Figure 24 and Figure 26 . An installation post 10721 is provided on the end face of the second sliding sleeve 1072, and it is inserted and connected with the first sliding sleeve 1073.

[0165] Both the first sliding sleeve 1073 and the second sliding sleeve 1072 are configured as columnar structures, and slideways 1071 extending along their axial directions are provided thereon. The number of slideways 1071 on the first sliding sleeve 1073 and the number of slideways 1071 on the second sliding sleeve 1072 both correspond one-to-one to the number of sliders 1062.

[0166] As Figure 24 and Figure 25 shown, the slideway 1071 is opened on the outer side wall of the second sliding sleeve 1072. A slider installation groove 10731 for moving each slider 1062 is further provided in the second sliding sleeve 1072, and each slider installation groove 10731 communicates with the corresponding slideway 1071 respectively. The slider installation grooves 10731 penetrate the second sliding sleeve 1072 axially respectively.

[0167] On the side wall of the slider mounting groove 10731, a ball groove 10732 is provided, which is correspondingly arranged opposite to the first groove 10623 on the slider 1062 mounted in the slider mounting groove 10731. The ball groove 10732 accommodates a part of the ball 1065, that is, the ball 1065 can roll between the ball groove 10732 and the corresponding first groove 10623.

[0168] As Figure 26 and Figure 27 shown, the slideway 1071 also extends to the outer side wall of the first sliding sleeve 1073. Similarly, the first sliding sleeve 1073 is also provided with a slider mounting groove 10731 for moving each slider 1062. It can be understood that the slider mounting groove 10731 in the first sliding sleeve 1073 is aligned with the corresponding slider mounting groove 10731 in the second sliding sleeve 1072, so as to form a moving path for the slider 1062.

[0169] The slideway 1071 can also serve to limit the stroke of the slider 1062. For example, when the first connecting rod 1063 is located at one end of the slideway 1071, the corresponding stroke of the slider 1062 is zero; when the first connecting rod 1063 is located at the other end of the slideway 1071, the corresponding slider 1062 is at the maximum stroke. The stroke of the slideway 1071 can be 0 mm - 40 mm.

[0170] In addition, a first housing chute 1011 and a second housing chute 1017 are respectively provided on each housing. The first housing chute 1011 is arranged in the second housing chute 1017, as described below Figure 33 and Figure 35 . The first housing chute 1011 communicates with the corresponding slideway 1071. The first connecting rod 1063 passes through the corresponding first housing chute 1011 and extends into the corresponding slideway 1071. The width of the second housing chute 1017 is greater than that of the first housing chute 1011, and it is used to accommodate the push button 1061 to restrict the moving path of the push button 1061.

[0171] In addition, second marking layers 1015 are respectively provided at positions corresponding to the second housing chutes 1017 on each housing. The second marking layers 1015 can be Arabic numerals such as "1", "2", etc., and are used to mark the item numbers of the corresponding sub-needle bundles 210, so as to facilitate the distinction of a certain sub-needle bundle 210.

[0172] Therefore, through the ball pair solution of the sub-needle driving mechanism 10 in this Embodiment 2, the resistance when pushing the sub-needle driving mechanism 10 can be reduced, and the smoothness of its movement can be improved.

[0173] Example 3

[0174] As Figures 28 - 51As shown, the present invention provides a housing mechanism for a radiofrequency ablation needle, which is used to accommodate the proximal part of the needle 2 of the radiofrequency ablation needle. The needle 2 may include, for example, a sub-needle bundle 210 and a main needle assembly 220. The housing mechanism 100 in this Embodiment 3 can be used in combination with the sub-needle expansion structure of the radiofrequency ablation needle described in the above Embodiment 1 and / or the sub-needle driving mechanism of the radiofrequency ablation needle described in the above Embodiment 2, or can be used alone.

[0175] As described above, in order to facilitate the installation of the sub-needle driving mechanism 10 for each sub-needle bundle 210, the housing mechanism 100 can be configured as a split structure including multiple housings, and the number of housings can correspond one-to-one to the number of sub-needle bundles 210. As Figure 35 shown, the housing mechanism 100 includes a first housing 101, a second housing 102, a third housing 103, and a fourth housing 104 that are snap-fitted together, making it more convenient for disassembly and assembly.

[0176] As Figure 28 、 Figure 29 、 Figure 30 、 Figure 31 and Figure 39 shown, when the sub-needle bundle 210 is exhibited, it is exhibited through the sub-needle exhibition opening 2204 on the main needle assembly 220. The present invention provides a knob mechanism 105 in the housing mechanism 100 to open or close the sub-needle exhibition opening 2204, thereby ensuring the safety of the operation.

[0177] First, the specific structure of the sub-needle exhibition opening 2204 will be described. Please refer to Figure 36 、 Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 and Figure 41 , the main needle assembly 220 includes an outer needle rod 2201 and a main needle 2202. The outer needle rod 2201 covers a part of the main needle 2202, and the main needle tip 2203 of the main needle 2202 is exposed outside the outer needle rod 2201. As Figure 42b shown, since the diameter of the main needle 2202 is smaller than the diameter of the main needle tip 2203, a stepped structure is formed between the main needle 2202 and the main needle tip 2203. The sub-needle exhibition opening 2204 is located between the distal end of the outer needle rod 2201 and the proximal end of the main needle tip 2203. More specifically, since there is a gap between the distal end of the outer needle rod 2201 and the proximal end of the main needle tip 2203, the sub-needle exhibition opening 2204 is formed. As Figure 42b shown, the open state of the sub-needle exhibition opening 2204 is shown; when the distal end of the outer needle rod 2201 abuts against this stepped structure, that is, the distal end of the outer needle rod 2201 is in contact with the proximal end of the main needle tip 2203, the gap between the two is zero at this time, that is, the sub-needle exhibition opening 2204 is closed.

[0178] Therefore, it can be understood that when the outer needle rod 2201 moves relative to the main needle 2202 (or the main needle tip 2203), if the distal end of the outer needle rod 2201 moves away from the proximal end of the main needle tip 2203, the sub-needle outlet 2204 is opened, and at this time, the sub-needle bundle 210 can be extended from the sub-needle outlet 2204; conversely, after the sub-needle outlet 2204 is retracted, the distal end of the outer needle rod 2201 is brought close to the proximal end of the main needle tip 2203 until the two are in contact with each other, and the sub-needle outlet 2204 can be closed.

[0179] In the present invention, the movement of the outer needle rod 2201 relative to the main needle 2202 (or the main needle tip 2203) is realized by the dial mechanism 105. As Figure 34 and Figures 43 - 46 shown, the dial mechanism 105 includes a dial 1051 and a dial cylinder 1052. The dial 1051 can be connected to the dial cylinder 1052 through a second connecting rod 1054. The dial 1051 can be located outside the housing mechanism 100 to facilitate the operator to apply force.

[0180] As Figure 47 and Figure 48 shown, the dial cylinder 1052 is coaxially arranged with the housing mechanism 100 and can rotate along the axial direction of the housing mechanism 100. A lead screw 110 is arranged in the dial cylinder 1052. As Figure 44 shown, an internal thread 1053 is arranged on the inner wall of the dial cylinder 1052, and an external thread 1103 is arranged on the outer wall of the lead screw 110. The dial cylinder 1052 and the lead screw 110 form a threaded connection. Therefore, when the dial cylinder 1052 rotates, its rotational motion can be converted into the rotational and linear motion of the lead screw 110.

[0181] As Figure 45 and Figure 46 shown, one end of the lead screw 110 is provided with a connecting portion 1104, and an outer needle rod connection hole 1102 is arranged in the connecting portion 1104. The outer needle rod 2201 passes through the outer needle rod connection hole 1102 and is thus connected to the outer needle rod 2201. Therefore, when the lead screw 110 moves linearly, the outer needle rod 2201 can be driven to move. For example, when the dial cylinder 1052 rotates clockwise, the lead screw 110 drives the outer needle rod 2201 to move toward the direction close to the main needle tip 2203; when the dial cylinder 1052 rotates counterclockwise, the lead screw 110 drives the outer needle rod 2201 to move away from the direction of the main needle tip 2203, and vice versa.

[0182] As Figure 46 shown, the other end of the lead screw 110 is further provided with a receiving portion, and the above-mentioned pressure pad 131 and sealing ring 132 are sequentially arranged in the receiving portion.

[0183] Furthermore, as Figure 47 、Figure 28 As shown, the connecting portion 1104 of the lead screw 110 is supported by the first baffle 2025 and the second baffle 2026 in the housing mechanism 100. Since the first housing 101, the second housing 102, the third housing 103, and the fourth housing 104 can be constructed in a rotationally symmetric manner, one of the housings will be taken as an example for illustration below.

[0184] As Figure 51 shown, the second housing 102 is provided with a first baffle 2025 and a second baffle 2026 extending along its radial direction. The first baffle 2025 and the second baffle 2026 are arranged at intervals and are connected by a connecting baffle 2027. Among them, a needle groove 20261 is provided on the second baffle 2026. When multiple housings are buckled together, the needle grooves 20261 on the multiple housings can enclose a needle hole 1092 for installing the needle 2, as Figure 47 and Figure 49 shown, the outer needle rod 2201 can be inserted into the needle hole 1092.

[0185] Please continue to refer to Figure 51 , the first baffle 2025 is also respectively provided with an arc section 20251 and a flat section 20252 that are connected. When multiple housings are buckled together, the needle grooves 20261 on the multiple housings can enclose a lead screw hole 1091 for installing the lead screw 110, as Figure 50 and Figure 48 shown, the connecting portion 1104 of the lead screw 110 can be inserted into the lead screw hole 1091.

[0186] As Figure 45 shown, a platform 1101 is provided on the connecting portion 1104 of the lead screw 110. The platform 1101 is a flat portion extending along the axis of the lead screw 110 on the connecting portion 1104. The number of platforms 1101 can be two, and the two platforms 1101 are symmetric with respect to the axis of the lead screw 110. By providing the platform 1101 on the connecting portion 1104, the outer surface of the connecting portion 1104 is divided into an arc surface and a flat surface. Among them, the arc surface cooperates with the arc section 20251 on the corresponding first baffle 2025, and the flat surface cooperates with the flat section 20252 on the first baffle 2025. Thus, during the rotation of the lead screw 110, when the arc surface thereon rotates to the flat section 20252 on the corresponding first baffle 2025, it cannot continue to rotate, thereby restricting the linear movement distance of the lead screw 110 and avoiding the distal end of the outer needle rod 2201 from colliding with the main needle tip 2203.

[0187] In addition, there is a certain gap between the first baffle 2025 and the second baffle 2026, and the second baffle 2026 blocks a part of the lead screw hole 1091 in the radial direction. Therefore, the maximum moving distance of the lead screw 110 is when it moves to the end of the connecting portion 1104 of the lead screw 110 in contact with the second baffle 2026, thus ensuring the safety of the outer needle rod 2201.

[0188] On the one hand, the platform 1101 on the connecting portion 1104 is used for guiding when the lead screw 110 rotates to convert circular motion into linear motion; on the other hand, the platform 1101 can act as a reinforcing rib, thereby improving the strength of the first baffle 2025 and the second baffle 2026.

[0189] It can be understood that the outer needle rod connection hole 1102 in the connecting portion 1104 is coaxially arranged with the needle groove 20261 formed after being buckled with each second baffle 2026, so that the proximal ends of the outer needle rod 2201 and the main needle 2202 can sequentially pass through the needle groove 20261 and the outer needle rod connection hole 1102 and enter the interior of the housing mechanism 100.

[0190] Please refer to Figure 29 and Figure 33 , on one or several of the housings, a knob chute 1012 can be provided. The knob chute 1012 extends along the circumferential direction of the housing mechanism 100, and the knob 1051 can move in the knob chute 1012 (as Figure 47 shown), thereby driving the knob barrel 1052 to rotate.

[0191] In addition, at positions corresponding to both ends of the knob chute 1012 on the housing, first marking layers 1014 are respectively provided, such as "ON" and "OFF", so as to indicate the opening or closing of the sub-needle outlet 2204.

[0192] The knob chute 1012 can be constructed in the same way as the first housing chute 1011 and the second housing chute 1017 described above, that is, a second connecting rod 1054 is arranged in the groove with a smaller width, and the knob 1051 is arranged in the groove with a larger width, thereby restricting the moving path of the knob 1051.

[0193] Each sub-needle bundle 210 can be independently exhibited from the sub-needle outlet 2204, and the exhibition degrees of each sub-needle bundle 210 are independent of each other. As Figure 38 and Figure 39 shown, the diameters of some of the sub-needle bundles 210 exhibited are R1, and the diameters of some other sub-needle bundles 210 exhibited are R2, where R1 < R2; as Figure 40 and Figure 41 shown, all the sub-needle bundles 210 are completely exhibited, and their exhibited diameters are all R2. As Figure 40As shown, all the sub-needle bundles 210 are fully extended, so that the maximum ablation diameter of the radiofrequency ablation needle can reach 80 mm.

[0194] As Figure 42a shown, the main needle tip 2203 is constructed as a triangular tip structure, on which there is a main needle infusion hole 2032. The inside of the main needle 2202 is a hollow structure. The main needle 2202 is in fluid communication with Figure 36 and Figure 37 the main needle infusion tube 3 shown. Thus, agents such as normal saline, injection anesthetic, and alcohol can be injected into the main needle 2202 through the main needle infusion tube 3 and enter the ablation area through the main needle infusion hole 2032 to expand the ablation range or provide corresponding functions according to clinical needs. As Figure 42a shown, a main needle temperature detection part 2031 is also provided inside the main needle tip 2203 near the needle tip for monitoring the temperature of the tissue at the main needle 2202.

[0195] As Figure 50 and Figure 51 shown, the shells are spliced with each other circumferentially to form a complete shell mechanism 100. As Figure 51 shown, taking the second shell 102 as an example, engaging parts 1021 are respectively provided at both side edges of the second shell 102. The engaging parts 1021 can be, for example, engaging bosses, etc. When it is docked with the first shell 101 and the third shell 103, the engaging parts 1021 on the mutually cooperating shells form a mortise and tenon structure, thus forming a stable connection, and after the shells are engaged with each other, a shell mechanism 100 with relatively consistent external dimensions can be formed.

[0196] A control mechanism 7 is also provided in the shell mechanism 100. The control mechanism 7 can be, for example, a control board, etc. As Figure 28 shown, an indicator light 701 is provided on the control mechanism 7, which is used to display the working state of each sub-needle bundle 210. Therefore, it can be understood that the number of control mechanisms 7 can be multiple, and the multiple control mechanisms 7 are respectively in one-to-one correspondence with the sub-needle bundles 210.

[0197] As Figure 33 shown, viewing windows 1013 are respectively provided on each shell, corresponding to the position where the indicator light 701 is located. Therefore, the indicator light 701 can display its brightness through the viewing window 1013.

[0198] A cable 5 is also connected to the control mechanism 7. The cable 5 extends from the proximal end of the shell mechanism 100 to the outside of the shell mechanism 100 and is connected to the host through an external plug (such as an aviation plug). Therefore, the host can control the control mechanism 7.

[0199] Embodiment 3 further provides a radiofrequency ablation needle, which includes a housing mechanism 100 and a needle 2. The needle 2 includes the main needle assembly 220 and the sub-needle bundle 210 described above.

[0200] Example 4

[0201] As Figures 52 - 57 shown, the present invention provides a liquid injection adjustment mechanism for a radiofrequency ablation needle, which is used to adjust the flow rate and velocity of liquid injection into the sub-needle bundle 210 of the radiofrequency ablation needle. The liquid injection adjustment mechanism 4 in Embodiment 4 can be used in combination with one or several of the sub-needle expansion structure of the radiofrequency ablation needle described in Embodiment 1 above, the sub-needle driving mechanism of the radiofrequency ablation needle described in Embodiment 2 above, or the housing mechanism of the radiofrequency ablation needle described in Embodiment 3 above, or can also be used alone.

[0202] As Figure 52 、 Figure 53 and Figure 54 shown, the liquid injection adjustment mechanism 4 in Embodiment 4 includes a regulating valve 401. The regulating valve 401 is configured with a one-inlet and multiple-outlets structure, and each of its outlets corresponds to a sub-needle bundle 210, so that the adjustment and closing of the liquid injection flow rate or velocity of any sub-needle bundle 210 can be realized.

[0203] Specifically, the diversion ports 4014 of the regulating valve 401 (as Figure 58 shown), that is, its outlets are respectively in fluid communication with the liquid outlet pipes 402; the liquid inlet port 4015 of the regulating valve 401 (as Figure 8 shown), that is, its inlet is in fluid communication with the liquid inlet pipe 403.

[0204] As Figure 52 shown, there are multiple liquid outlet pipes 402, and the number thereof corresponds one-to-one to the number of sub-needle bundles 210. The ends of the multiple liquid outlet pipes 402 away from the regulating valve 401 are respectively connected to the first connectors 4021, and through the first connectors 4021, each liquid outlet pipe 402 is in fluid communication with the corresponding sub-needle bundle 210. More specifically, please refer to Figure 28 , each liquid outlet pipe 402 is respectively in fluid communication with the sub-needle liquid injection pipe 6 connected to the proximal end of each sub-needle bundle 210.

[0205] A second connector 4031 is provided at the end of the liquid inlet pipe 403 away from the regulating valve 401. The liquid inlet pipe 403 can be connected to a syringe or an injection pump through the second connector 4031. By connecting the second connector 4031 and the first connector 4021 to the liquid inlet pipe 403 and the liquid outlet pipe 402 respectively, the confusion between the liquid inlet pipe 403 and the liquid outlet pipe 402 can be prevented. The other end of the liquid inlet pipe 403 is in communication with the liquid inlet port 4015 of the regulating valve 401 (as Figure 58 shown).

[0206] As Figure 52 andFigure 53 As shown, the liquid injection adjustment mechanism 4 further includes rollers 404. A roller installation groove 4012 is provided in the regulating valve 401, and the rollers 404 are installed in the roller installation groove 4012. The numbers of the rollers 404 and the roller installation grooves 4012 are the same as the number of the sub-needle bundles 210, so as to achieve individual control for each sub-needle bundle 210.

[0207] As Figure 55 shown, at the positions corresponding to the ends of the respective roller installation grooves 4012 on the regulating valve 401, a third marking layer 4011 is provided, which may be Arabic numerals such as "1", "2", etc., and it corresponds to the second marking layer 1015 on the housing mechanism 100, facilitating quick identification of the need to adjust or close the liquid injection of a certain sub-needle bundle 210.

[0208] As Figure 55 shown, at the positions corresponding to the ends of the respective roller installation grooves 4012 on the regulating valve 401, a fourth marking layer 4016 is provided, which can represent the magnitude of the flow rate or velocity of the medium in the pipe.

[0209] As Figure 57 shown, a first rolling tooth 4041 is provided on the outer circumferential wall of the roller 404, and the first rolling tooth 4041 is used for anti-slip during manual operation. Second rolling teeth 4042 are respectively provided on both axial sides of the roller 404, and the second rolling teeth 4042 are connected to the roller 404 through a roller shaft. As Figure 58 and Figure 59 shown, tooth groove channels 4013 are respectively provided on both side walls of the roller installation groove 4012, and tooth grooves 4019 are provided on the side walls of the tooth groove channels 4013. When the roller 404 is located in the corresponding roller installation groove 4012, the roller shaft of the roller 404 is inserted into the tooth groove channel 4013, and the second rolling teeth 4042 are respectively engaged and positioned with the tooth grooves 4019 in the corresponding tooth groove channels 4013.

[0210] As Figure 58 and Figure 59 shown, the bottom wall of the roller installation groove 4012 includes a parallel surface 4017, an inclined surface 4018 and a mounting surface 4010. The parallel surface 4017 is substantially parallel to the upper wall of the roller installation groove 4012, and there is an angle θ 1 between the inclined surface 4018 and the upper wall of the roller installation groove 4012. The mounting surface 4010 may have an angle θ 2 with the upper wall of the installation groove 4012, and it is smaller than θ 1.

[0211] Therefore, by constructing the bottom wall of the roller installation groove 4012 into the above three structures, the movement of the roller 404 in the roller installation groove 4012 can be divided into three stages. As Figure 56As shown, the S3 stage is for the installation of the roller 404; the S1 stage is for squeezing the cross-section of the liquid outlet pipe 402 by the roller 404, thereby realizing the adjustment of the flow rate or flow of the medium in the pipe; the S2 stage is for further squeezing the cross-section of the liquid outlet pipe 402 by the roller 404, thereby realizing the cut-off or closing of the flow of the medium in the pipe.

[0212] At the positions corresponding to the parallel plane 4017 and the inclined plane 4018 on the tooth groove path 4013, tooth grooves 4019 are provided, which can be engaged and positioned with the second hob 4042. Tooth grooves 4019 are not provided at the positions corresponding to the installation surface 4010 on the tooth groove path 4013 to facilitate the installation of the second hob 4042.

[0213] Embodiment 3 of the present invention further provides a radiofrequency ablation needle, which includes an injection liquid adjusting mechanism 4 and a needle 2. The needle 2 includes the main needle assembly 220 and the sub-needle bundle 210 described above, and the injection liquid adjusting mechanism 4 is in fluid communication with the sub-needle bundle 210.

[0214] Although the present invention has been described with reference to the preferred embodiments, various modifications can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sub-needle expansion structure of a radiofrequency ablation needle, characterized in that Comprising: A sub-needle driving mechanism, connected to a sub-needle bundle of a radiofrequency ablation needle. A portion of the sub-needle bundle between the sub-needle driving mechanism and the distal fixing portion of the radiofrequency ablation needle is a length-variable segmented sub-needle bundle. The sub-needle driving mechanism drives the sub-needle bundle to move through the distal fixing portion for expansion or retract from the distal fixing portion; and A sub-needle anti-bending mechanism, located between the sub-needle driving mechanism and the distal fixing portion, and connected to the sub-needle driving mechanism. The sub-needle anti-bending mechanism can adjust its position following the movement of the sub-needle bundle, and provide support and restraint for the segmented sub-needle bundle; When the sub-needle anti-bending mechanism adjusts its position following the movement of the sub-needle bundle, the sub-needle anti-bending mechanism is always located at the middle position of the segmented sub-needle bundle, so as to provide support and restraint for the segmented sub-needle bundle.

2. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 1, wherein The sub-needle anti-bending mechanism includes: A moving adjustment member, one end of which abuts against the outer wall of the segmented sub-needle bundle; and A series spring group, connected to the moving adjustment member. The series spring group is also respectively connected to the distal fixing portion and the sub-needle driving mechanism. When the sub-needle driving mechanism drives the sub-needle bundle to move, the series spring group can adjust the position of the moving adjustment member to make it always located at the middle position of the segmented sub-needle bundle.

3. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 2, wherein, The series spring group includes springs respectively located on opposite sides of the moving adjustment member. The springs on both sides respectively abut against both sides of the moving adjustment member. One end of the spring on one side is fixedly connected to the sub-needle driving mechanism, and one end of the spring on the other side is fixedly connected to the distal fixing portion.

4. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 2, characterized in that, The sub-needle anti-bending mechanism includes one or both of a first guide rod and a second guide rod extending along the moving direction of the sub-needle bundle. The series spring group is wound around the first guide rod or the second guide rod. The first guide rod and / or the second guide rod respectively penetrate through the moving adjustment member and the sub-needle driving mechanism.

5. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 4, characterized in that, The moving adjustment member includes a pressing plate and an abutting portion. The first guide rod and / or the second guide rod respectively penetrate through the pressing plate. One end of the abutting portion is connected to the pressing plate, and the other end abuts against the outer wall of the segmented sub-needle bundle.

6. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 4, characterized in that, The proximal end of the sub-needle bundle is communicated with a sub-needle liquid injection tube. The sub-needle liquid injection tube is spirally wound around the first guide rod or the second guide rod.

7. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 1, wherein, The number of the sub-needle bundles is one or more. When the number of the sub-needle bundles is multiple, the multiple sub-needle bundles are sequentially arranged along the circumferential direction of the main needle assembly of the radiofrequency ablation needle; and each sub-needle bundle corresponds to one sub-needle driving mechanism and the sub-needle anti-bending mechanism.

8. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 7, characterized in that, The sub-needle bundle includes a sub-needle sleeve and a capillary tube. The sub-needle sleeve covers a part of the capillary tube. An arc-shaped recessed portion is provided on one side of the sub-needle sleeve close to the main needle assembly. The arc-shaped recessed portion is configured to be recessed towards the inside of the sub-needle sleeve and extend along the axial direction of the sub-needle sleeve.

9. The sub-needle expansion structure of the radiofrequency ablation needle according to claim 8, characterized in that, The number of the capillary tubes is one or more. At least one sub-needle temperature detection portion is provided at the distal end of each capillary tube.

10. A radiofrequency ablation needle, characterized in that, The sub-needle expansion structure of the radiofrequency ablation needle according to any one of claims 1-9, further comprising a housing mechanism, a sub-needle bundle and a main needle assembly, wherein the sub-needle bundle is arranged on the circumferential side of the main needle assembly, and the proximal ends of the sub-needle bundle and the main needle assembly are both arranged in the housing mechanism, and the distal fixing part is configured as a radial baffle located inside the housing mechanism.

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