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

Abstract

The invention relates to a sub-needle expansion structure of a radio frequency ablation needle and the radio frequency ablation needle, and relates to the technical field of ablation. The sub-needle expansion structure of the radiofrequency ablation needle comprises the sub-needle driving mechanism and the sub-needle anti-bending mechanism, and the sub-needle anti-bending mechanism can be adjusted in position along with the movement of the sub-needle bundles, so that the sub-needle anti-bending mechanism can be always positioned in the middle of the segmented sub-needle bundles; therefore, supporting and restraining are provided for the segmented sub-needle bundles in the middle positions of the segmented sub-needle bundles, and the phenomenon that the sub-needle bundles are bent is avoided.

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, it is very easy for the sub-needles to bend during the movement, which will undoubtedly have an adverse effect 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, comprising: A sub-needle driving mechanism connected to the sub-needle bundle of the radiofrequency ablation needle, wherein the 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 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.

[0005] 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.

[0006] In one embodiment, the sub-needle anti-bending mechanism comprises: 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 part 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. In one embodiment, the series spring group includes springs respectively located on opposite sides of the moving adjustment member, and the springs on both sides are respectively in contact 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. 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. 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.

[0007] In one embodiment, the proximal end of the sub-needle bundle is communicated with a sub-needle liquid injection tube, and the sub-needle liquid injection tube is spirally wound around the first guide rod or the second guide rod.

[0008] 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.

[0009] In one embodiment, 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. 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.

[0010] The present invention also provides a radiofrequency ablation needle, which includes the sub-needle expansion structure of the above-mentioned radiofrequency ablation needle, 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. The proximal sides of the sub-needle bundle and the main needle assembly are both arranged in the housing mechanism, and the distal fixing portion is configured as a radial baffle located inside the housing mechanism.

[0011] Compared with the prior art, the advantages of the present invention are as follows. 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 part, 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

[0012] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the drawings.

[0013] 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; 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; 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; 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; Figure 5 is a force diagram of equivalent beam structure of the sub-needle bundle; Figure 6 is Figure 5 the shown bending moment diagram; Figure 7 is an equivalent simplified diagram of the series spring group; Figure 8 is Figure 1 the three-dimensional structural schematic diagram of the shown sub-needle anti-bending mechanism; Figure 9 is Figure 8 the three-dimensional structural schematic diagram of the shown moving and adjusting member; Figure 10 is Figure 1 the enlarged view of the shown sub-needle anti-bending mechanism; Figure 11 is a schematic structural diagram of multiple sub-needle bundles of the radiofrequency ablation needle in Embodiment 1 of the present invention; Figure 12 is Figure 11 the front view of one of the shown sub-needle bundles; Figure 13 is Figure 12 the side view of the shown sub-needle bundle; Figure 14 is Figure 13 the enlarged view of the shown position A; Figure 15 It is a cross-sectional view of the tip position of the sub-needle bundle; Figure 16 It is a schematic diagram of the installation of the sub-needle drive mechanism in the housing mechanism in Embodiment 2 of the present invention; Figure 17 It is a three-dimensional structure schematic diagram of the sub-needle drive mechanism in Embodiment 2 of the present invention; Figure 18 It is Figure 17 a three-dimensional structure schematic diagram of the shown push-button slider group; Figure 19 It is Figure 18 a three-dimensional structure schematic diagram of the shown push-button slider group, in which a stop block is hidden; Figure 20a It is Figure 18 a three-dimensional structure schematic diagram of the shown push-button slider group, in which a stop block and a ball are hidden; Figure 20b It is Figure 18 a three-dimensional structure schematic diagram of the shown push-button slider group, in which two stop blocks and a ball are hidden; Figure 20c It is Figure 18 a three-dimensional structure schematic diagram of the shown push-button slider group, in which the connection between the slider and the sub-needle bundle is shown; Figure 21 It is Figure 18 a cross-sectional view of the shown push-button slider group; Figure 22 It is Figure 18 a three-dimensional structure schematic diagram of the shown stop block; Figure 23 It is Figure 18 a three-dimensional structure schematic diagram of the shown push-button slider group, in which the slider, the first connecting rod and the push button are hidden; Figure 24 It is Figure 17 a three-dimensional structure schematic diagram of the shown second sliding sleeve; Figure 25 It is Figure 17 a side view of the shown second sliding sleeve; Figure 26 It is Figure 17 a three-dimensional structure schematic diagram of the shown first sliding sleeve; Figure 27 It is Figure 17 a side view of the shown first sliding sleeve; Figure 28 It is the front view after the installation of the housing mechanism in Embodiment 3 of the present invention; Figure 29 It is the side view after the installation of the housing mechanism in Embodiment 3 of the present invention; Figure 30 It is Figure 28 an enlarged view at B; Figure 31 is Figure 29 An enlarged view at A; Figure 32 is Figure 28 The front view of the shown housing mechanism; Figure 33 is Figure 28 The top view of the shown housing mechanism; Figure 34 is Figure 28 The three-dimensional structure schematic diagram of the shown housing mechanism with one housing hidden; Figure 35 is Figure 28 The exploded view of the shown housing mechanism; Figure 36 The front view after the housing mechanism is installed in Embodiment 3 of the present invention, which shows the third winding state of the sub-needle injection tube; Figure 37 The front view after the housing mechanism is installed 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; Figure 38 The side view of partial sub-needle bundles with an exhibition radius of R1 and partial sub-needle bundles with an exhibition radius of R2 in Embodiment 3 of the present invention; Figure 39 The front view of partial sub-needle bundles with an exhibition radius of R1 and partial sub-needle bundles with an exhibition radius of R2 in Embodiment 3 of the present invention; Figure 40 The side view of all sub-needle bundles with an exhibition radius of R2 in Embodiment 3 of the present invention; Figure 41 The front view of all sub-needle bundles with an exhibition radius of R2 in Embodiment 3 of the present invention; Figure 42a is Figure 41 An enlarged view at C; Figure 42b is Figure 41 The three-dimensional structure schematic diagram of the shown sub-needle exhibition outlet; Figure 43 is Figure 34 The three-dimensional structure schematic diagram of the shown knob mechanism; Figure 44 is Figure 43 The three-dimensional structure schematic diagram of the shown barrel; Figure 45 is Figure 35 The three-dimensional structure schematic diagram of the shown lead screw; Figure 46 is Figure 35 The cross-sectional view of the shown knob mechanism; Figure 47Schematic perspective view of the screw rod installation in Embodiment 3 of the present invention; Figure 48 Axial sectional view after the screw rod installation in Embodiment 3 of the present invention; Figure 49 Radial sectional view after the screw rod installation in Embodiment 3 of the present invention; Figure 50 is Figure 49 Sectional view of the housing mechanism with the screw rod hidden, in which the first housing is hidden; Figure 51 is Figure 50 Sectional view of the second housing shown; Figure 52 Front view of the liquid injection adjustment mechanism in Embodiment 4 of the present invention; Figure 53 is Figure 52 Sectional view at E-E; Figure 54 Side view of the liquid injection adjustment mechanism in Embodiment 4 of the present invention; Figure 55 is Figure 52 Front view of the valve body shown; Figure 56 is Figure 55 Sectional view at F-F; Figure 57 is Figure 52 Schematic perspective view of the roller shown; Figure 58 is Figure 56 Enlarged view at G Figure 59 is Figure 52 Schematic perspective view of the valve body shown.

[0014] Reference numerals: 10, Sub-needle driving mechanism; 11, Sub-needle anti-bending mechanism; 12, Distal fixing part; 13, Sealing mechanism; 111, Moving adjustment member; 112, Series spring group; 113, First guide rod; 114, Second guide rod; 115, Flange; 1111, Pressure plate; 1112, Contact part; 1113, Groove; 1114, First mounting hole; 1115, Second mounting hole; 1121, Spring; 121, First card slot; 122, Second card slot; 131, Pressure pad; 132, Sealing ring; 210, Sub-needle bundle; 211, Segmented sub-needle bundle; 201, Sub-needle sleeve; 202, Capillary; 203, Sub-needle temperature detection part; 204, Process hole; 2011, arc-shaped recess; 2012, arc-shaped protrusion; 2013, bending part; 2, needle device; 100, housing mechanism; 101, first housing; 102, second housing; 103, third housing; 104, fourth housing; 108, flange; 1021, engaging part; 220, main needle assembly; 6, sub-needle infusion tube; 601, first winding state of sub-needle infusion tube; 602, second winding state of sub-needle infusion tube; 603, third winding state of sub-needle infusion tube; 106, push-button slider assembly; 1061, push button; 1062, slider; 1063, first connecting rod; 1064, stop block; 1065, ball; 1066, first guide rod hole; 1067, second guide rod hole; 10621, ball groove; 10622, sub-needle bundle fitting groove; 10623, first groove; 10624, second groove; 10625, ball hole; 10641, first stop block connecting column; 10642, second stop block connecting column; 107, sliding sleeve; 1072, second sliding sleeve; 1073, first sliding sleeve; 1071, slideway; 10721, mounting column; 10731, slider mounting groove; 10732, ball groove; 3, main needle infusion tube; 4, infusion regulation mechanism; 5, cable; 7, control mechanism; 105, dialing mechanism; 110, lead screw; 1011, first housing slide groove; 1012, dialing slide groove; 1013, window; 1014, first marking layer; 1015, second marking layer; 1016, scale line layer; 1017, second housing slide groove; 2201, outer needle rod; 2202, main needle; 2203, main needle tip; 2204, sub-needle outlet; 2031, main needle temperature detection part; 2032, main needle infusion hole; 2025, first baffle; 2026, second baffle; 2027, connecting baffle; 1091, lead screw hole; 1092, needle device hole; 20251, arc segment; 20252, flat segment; 20261, needle device groove; 1051, dialing button; 1052, dialing cylinder; 1053, internal thread; 1054, second connecting rod; 1101, platform; 1102, outer needle rod connection hole; 1103, external thread; 1104, connecting part; 701, indicator light; 401, regulating valve; 402, liquid outlet pipe; 403, liquid inlet pipe; 404, roller; 4011, the third marking layer; 4012, roller mounting groove; 4013, tooth groove track; 4014, shunt port; 4015, liquid inlet; 4016, the fourth marking layer; 4017, parallel plane; 4018, inclined plane; 4010, mounting surface; 4019, tooth groove; 4021, the first joint; 4031, the second joint; 4041, the first hob; 4042, the second hob. Detailed implementation mode

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Example 1 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 diverse. 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 achieve conformal ablation according to the shape of the tumor.

[0017] 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 segmented sub-needle bundle 211 with variable length. 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.

[0018] The segmented sub-needle bundle 211 is actually a part of the sub-needle bundle 210. For the convenience of understanding, the part 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 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, that is, the length of the segmented sub-needle bundle 211, is variable. For example, in Figure 2 the state shown, 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 state shown, the sub-needle bundle 210 is driven by the sub-needle driving mechanism 10 to move closer to the distal fixing part 12 (please refer to Figure 1 and Figure 34)(in the direction of) by a certain distance and expands 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 In the state shown in Figure 1 and Figure 34 ), the sub-needle bundle 210 is driven by the sub-needle driving mechanism 10 and continues to move in the direction close to the distal fixing portion 12 (please refer to

[0019] ), and expands 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.

[0020] The sub-needle anti-bending mechanism 11 is located between the sub-needle driving mechanism 10 and the distal fixing portion 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 portion 12, since the segmented sub-needle bundle 211 is always supported and restrained by the sub-needle anti-bending mechanism 11, it can ensure that the sub-needle bundle 210 is exhibited in a predetermined form, and avoid the bending phenomenon when the sub-needle bundle 210 is exhibited. Figure 5 As shown in Figure 6 ; there is a couple moment M at the midpoint position of this beam structure. From

[0021] Therefore, according to Figure 5 and Figure 6 the force analysis, the bending moment 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 the segmented sub-needle bundle 211 to prevent the segmented sub-needle bundle 211 from bending.

[0022] Furthermore, since the degree to which the sub-needle bundle 210 unfolds in the circumferential direction of the main needle assembly 220 can vary, 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 the segmented sub-needle bundle 211 by means of a series spring.

[0023] 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 portion 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 so that it is always located at the middle position of the segmented sub-needle bundle 211. Among them, the series spring group 112 includes springs 1121 that are respectively located on opposite sides of the moving adjustment member 111 and respectively abut 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 fixing portion 12. As Figure 7 shown is a simplified schematic diagram of the series spring group 112. Among them, the 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 formula for the series spring group that the elastic force of each section of the spring in the series spring group is equal to the magnitude of the external force value, that is, F = K1 * ΔX1 = K2 * ΔX2 = Kn * ΔXn.

[0024] 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. Furthermore, it can be obtained that: under the same external force F, the deformation amounts are equal, that is, ΔX1 = ΔX2 = ΔXn.

[0025] 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 the segmented sub-needle bundle 211, so as to support and restrain the segmented sub-needle bundle 211 at the midpoint position of the segmented sub-needle bundle 211 to avoid the phenomenon of bending or curving of the segmented sub-needle bundle 211.

[0026] Further, 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. As Figure 8 In 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 function 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 constraint to the segmented sub-needle bundle 211 in the radial direction, avoiding the segmented sub-needle bundle 211 from bending at its middle position when being subjected to the thrust of the sub-needle driving mechanism 10 and the frictional resistance of the distal fixing portion 12.

[0027] 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 lies 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 later Figure 38 , and 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, and 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 later Figure 38 and Figure 39, the expanded diameter of each sub-needle bundle 210 is 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 adjusting member 111 are respectively compressed under the action of force, thereby pushing the moving adjusting member 111 to continuously adjust its position along the axial directions of the first guide rod 113 and the second guide rod 114, so that the moving adjusting member 111 is located at the middle position of the segmented sub-needle bundle 211.

[0028] Therefore, in the present invention, the moving adjusting member 111 and the completely identical springs 1121 on both sides thereof are used 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 of bending of the sub-needle bundle 210.

[0029] 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 portion 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 portion 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.

[0030] 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 freely move 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 of support and restraint in the radial direction.

[0031] Please combine Figure 9 and Figure 10, the abutting portion 1112 is connected to the end of the pressing plate 1111, and can be connected, for example, by the rod-shaped structure shown in the figure. The abutting portion 1112 is configured as an arc-shaped plate structure, and one end thereof away from the pressing plate 1111 has a groove 1113, and the groove 1113 is configured as an arc-shaped groove, which has the same contour line as the segmented sub-needle bundle 211, so that it can smoothly fit with the outer wall of the segmented sub-needle bundle 211.

[0032] 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 portion (i.e., the portion away from the needle tip) of the sub-needle bundle 210 and the main needle assembly 220. A distal fixing portion 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 respectively extend between the distal fixing portion 12 and the flange 108. As Figure 10 shown, and please refer to Figure 11 , the distal fixing portion 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. Among them, the first end of the first guide rod 113 and the first end of the second guide rod 114 are respectively engaged 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 portion 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 the length of the first guide rod 113. Correspondingly, the number of flanges 108 is two, and one of them is closer to the distal fixing portion 12, so as to be fixedly connected to the second end of the first guide rod 113.

[0033] Please refer to 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 portion 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 at the distal fixing portion 12, and the sub-needle bundle 210 passes through the pressure pad 131 and the sealing ring 132 in sequence. When the sub-needle bundle 210 is being displayed, it moves relative to the main needle assembly 220 and is displayed 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 moves relative to the main needle assembly 220, and the sealing mechanism 13 is fixed to the distal fixing portion 12. The sub-needle bundle 210 passes through the pressing pad 131 and the sealing ring 132 in this way, and then a frictional resistance will be formed between the pressing pad 131 and the sealing ring 132 and the sub-needle bundle 210. The sub-needle anti-bending mechanism 11 described above is used to prevent the sub-needle bundle 210 from bending.

[0034] 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, and the display or retraction of each sub-needle bundle 210 will drive the shape of the corresponding sub-needle liquid injection tube 6 to change, resulting in a relatively messy layout of the multiple sub-needle liquid injection tubes 6 within the housing mechanism 100 and possible interference between them. Therefore, in order 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 displayed, so the sub-needle liquid injection tube 6 is wound around the second guide rod 114 in a completely 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 displayed 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 completely displayed, so the sub-needle liquid injection tube 6 is further stretched to the maximum extended 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 respectively, so that the movement of each sub-needle liquid injection tube 6 is relatively independent, avoiding the phenomenon of interfering with each other.

[0035] 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 physiological saline, injection anesthetic, alcohol, etc. 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.

[0036] As described above, the number of the sub-needle bundles 210 may be multiple, and the multiple sub-needle bundles 210 are sequentially arranged along the circumferential direction of the main needle assembly 220 of the radiofrequency ablation needle. As Figure 11 shown in the illustrated embodiment, four sub-needle bundles 210 are shown, and the four sub-needle bundles 210 are respectively and equidistantly surrounded on 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 extending 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.

[0037] As Figure 12 , Figure 13 , Figure 14 , and Figure 15 shown, the sub-needle bundle 210 includes a sub-needle sleeve 201 and a capillary 202. The sub-needle sleeve 201 covers a part of the capillary 202. Therefore, it can be known that when the sub-needle bundle 210 extends, the part of the capillary 202 not covered by the sub-needle sleeve 201 is extended through the sub-needle outlet 2204 of the main needle assembly 220. The sub-needle sleeve 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 sleeve 201. The process holes 204 are respectively used for welding or bonding between the capillaries 202. Therefore, the sub-needle sleeve 201 eliminates the need for tooling such as sub-needle clustering tooling and welding tooling, and can achieve one-stop forming. The specific number and size of the process holes 204 can be set according to actual requirements.

[0038] As Figure 13 and Figure 14 shown, the cross-section of the sub-needle sleeve 201 is an arc-shaped cross-section, and an arc-shaped recess 2011 is arranged on the side thereof close to the main needle assembly 220 (please refer to Figure 11 ). Since the sub-needle bundle 210 is arranged around the circumference of the main needle assembly 220, the arc-shaped recess 2011 on the sub-needle sleeve 201 is beneficial to form a passage for the main needle assembly 220 to pass through.

[0039] On the side of the sub-needle sleeve 201 away from the main needle assembly 220, there is correspondingly an arc-shaped convex portion 2012, and 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 sleeve 201.

[0040] The capillary 202 may be a stainless steel capillary. As Figure 12 shown, the number of the capillaries 202 may be one or more. As Figure 15As shown, at least one sub-needle temperature detection part 203 is provided at the distal end of each capillary 202. The sub-needle temperature detection part 203 can be a temperature measuring device such as a temperature sensor or a thermocouple. The sub-needle temperature detection part 203 is used to monitor the tissue temperature at each sub-needle bundle 210.

[0041] In addition, a main-needle temperature detection part 2031 (such as a sensor or a thermocouple, etc., see 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. By cooperating with an ablation instrument, the main-needle temperature detection part 2031 and the sub-needle temperature detection part 203 can realize arbitrary switching of the main control area, so that the position of this temperature detection part is used as the main ablation area.

[0042] The maximum diameter of the sub-needle bundle 210 when unfolded is 40 mm. If multiple sub-needle bundles 210 are all unfolded (please refer to Figure 40 and Figure 41 the 4 sub-needle bundles shown), the maximum ablation diameter of the radiofrequency ablation needle can reach 80 mm.

[0043] The present invention also provides a radiofrequency ablation needle, which includes a sub-needle expansion structure of the radiofrequency ablation needle, and also 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.

[0044] Example 2 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 in the circumferential direction of 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.

[0045] 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.

[0046] The number of sub-needle bundles 210 can be one or more. For example, when the number of sub-needle bundles 210 is multiple, in order to realize individual control of each sub-needle bundle 210, a plurality of sub-needle driving mechanisms 10 are correspondingly provided. For example Figure 16In the illustrated embodiment, four sub-needle bundles 210 are provided, and correspondingly, four sub-needle driving mechanisms 10 are provided. The sub-needle driving mechanisms 10 can be installed through the housing mechanism 100. For the convenience of installation, the housing mechanism 100 is provided 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, where each housing corresponds to a sub-needle driving mechanism 10 respectively.

[0047] 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.

[0048] As Figure 18 shown, the push-button slider assembly 106 includes a slider 1062. Please refer to Figure 10 , one end of the slider 1062 is connected to the sub-needle bundle 210. The first guide rod hole 1066 and the second guide rod hole 1067 are respectively provided on the slider 1062, and the first guide rod 113 and the second guide rod 114 are respectively provided through 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.

[0049] Furthermore, 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 provided as a split structure, that is, the sliding sleeve 107 can include a first sliding sleeve 1073 and a second sliding sleeve 1072 that are detachably connected. Among them, the 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 to the number of sliders 1062, and each slider 1062 moves in the corresponding slider installation grooves 10731 of the first sliding sleeve 1073 and the second sliding sleeve 1072.

[0050] 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°. This can facilitate the integration of a plurality of sliders 1062 in the cylindrical sliding sleeve 107, and the movements of each slider 1062 do not interfere with each other. Correspondingly, each slider installation groove 10731 can also be constructed as a sector groove.

[0051] It can be understood that the central angle of the slider 1062 and the number of sliders 1062 nrelated, for example Figure 20a As shown, the central angle of the slider 1062 is 45°, and four sliders 1062 can be corresponding.

[0052] such as Figure 19 and Figure 20a As shown, a ball groove 10621 is provided on the slider 1062, and the push button slider assembly 106 further includes balls 1065 located in the ball groove 10621. The balls 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 mounting groove 10731.

[0053] 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 mounting groove 10731.

[0054] such as Figure 20b As shown, the ball groove 10621 includes a first groove 10623 on one side wall 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.

[0055] First guide rod holes 1066 and second guide rod holes 1067 are also respectively provided on the slider 1062, which penetrate through two opposite sector surfaces of the slider 1062 respectively and are respectively used for passing through the first guide rod 113 and the second guide rod 114 described above.

[0056] 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 connected or fixedly connected to the slider 1062 respectively. As Figure 21 , Figure 22 and Figure 23As shown, the stopper 1064 is provided with a first stopper connecting post 10641 and a second stopper connecting 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 connecting post 10641 and the second stopper connecting post 10642 respectively.

[0057] In addition, a ball groove 10621 can also be provided on the stopper 1064. It can be understood that during the movement of the slider 1062, the balls installed in the ball holes 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 holes 10625, thereby achieving rolling connection.

[0058] 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.

[0059] Furthermore, as Figure 20a shown, one end of the slider 1062 away 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 fits better with the sub-needle sleeve 201 and is welded or bonded, so as to better apply force to the sub-needle sleeve 201 to drive its movement.

[0060] 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.

[0061] 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, which is inserted and connected with the first sliding sleeve 1073.

[0062] The first sliding sleeve 1073 and the second sliding sleeve 1072 are both configured as columnar structures, and sliding channels 1071 extending along their axial directions are provided thereon. The number of sliding channels 1071 on the first sliding sleeve 1073 and the number of sliding channels 1071 on the second sliding sleeve 1072 both correspond one-to-one with the number of sliders 1062.

[0063] As Figure 24 and Figure 25 shown, the sliding channels 1071 are formed on the outer sidewall of the second sliding sleeve 1072. A slider mounting groove 10731 for moving each slider 1062 is further provided in the second sliding sleeve 1072, and the respective slider mounting grooves 10731 communicate with the corresponding sliding channels 1071. The slider mounting grooves 10731 axially penetrate the second sliding sleeve 1072 respectively.

[0064] Ball grooves 10732 are provided on the sidewalls of the slider mounting grooves 10731, and the ball grooves 10732 are provided corresponding to the first grooves 10623 on the sliders 1062 mounted in the slider mounting grooves 10731. A part of the balls 1065 is received in the ball grooves 10732, that is, the balls 1065 can roll between the ball grooves 10732 and the corresponding first grooves 10623.

[0065] As Figure 26 and Figure 27 shown, the sliding channels 1071 also extend to the outer sidewall of the first sliding sleeve 1073. Similarly, a slider mounting groove 10731 for moving each slider 1062 is also provided in the first sliding sleeve 1073. Understandably, the slider mounting grooves 10731 in the first sliding sleeve 1073 and the corresponding slider mounting grooves 10731 in the second sliding sleeve 1072 are aligned with each other, thereby forming a moving path for the sliders 1062.

[0066] The sliding channels 1071 can also serve to limit the stroke of the sliders 1062. For example, when the first connecting rod 1063 is located at one end of the sliding channel 1071, the corresponding stroke of the slider 1062 is zero; when the first connecting rod 1063 is located at the other end of the sliding channel 1071, the corresponding slider 1062 is at the maximum stroke, and the stroke of the sliding channel 1071 can be 0 mm - 40 mm.

[0067] In addition, a first housing sliding groove 1011 and a second housing sliding groove 1017 are respectively provided on each housing, and the first housing sliding groove 1011 is provided in the second housing sliding groove 1017, as described below Figure 33 and Figure 35。The first housing chute 1011 communicates with the corresponding slideway 1071, and 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 movement path of the push button 1061.

[0068] In addition, second marking layers 1015 are respectively arranged at positions corresponding to the second housing chute 1017 on each housing. The second marking layers 1015 can be Arabic numerals such as "1", "2", etc., and are used to calibrate the item numbers of the corresponding sub-needle bundles 210 to facilitate the distinction of a certain sub-needle bundle 210.

[0069] Therefore, with the solution of the ball pair in 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.

[0070] Example 3 As Figures 28 - 51 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 with the sub-needle driving mechanism of the radiofrequency ablation needle described in the above Embodiment 2, or can be used alone.

[0071] 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 constructed as a split structure including multiple housings, and the number of housings can correspond one-to-one with 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 buckled with each other, so as to be more convenient for disassembly and assembly. 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 sets a dial mechanism 105 in the housing mechanism 100 to open or close the sub-needle exhibition opening 2204, so as to ensure the safety of the operation.

[0072] 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 andFigure 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 that 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 outlet 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 outlet 2204 is formed. As Figure 42b shown, the state where the sub-needle outlet 2204 is open 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 fits 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 outlet 2204 is closed.

[0073] 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 expanded 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 moved closer 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.

[0074] 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 achieved through the knob mechanism 105. As Figure 34 and Figures 43 - 46 shown, the knob mechanism 105 includes a knob 1051 and a knob barrel 1052. The knob 1051 can be connected to the knob barrel 1052 through a second connecting rod 1054. The knob 1051 can be located outside the housing mechanism 100 for the operator to apply force.

[0075] As Figure 47 and Figure 48 shown, the knob barrel 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 knob barrel 1052. As Figure 44 shown, an internal thread 1053 is arranged on the inner wall of the knob barrel 1052, and an external thread 1103 is arranged on the outer wall of the lead screw 110. The knob barrel 1052 and the lead screw 110 form a threaded connection. Therefore, when the knob barrel 1052 rotates, its rotational motion can be converted into the rotational and linear motion of the lead screw 110.

[0076] As Figure 45 andFigure 46 As shown, one end of the lead screw 110 is provided with a connecting portion 1104, and an outer needle rod connecting hole 1102 is provided in the connecting portion 1104. The outer needle rod 2201 is inserted through the outer needle rod connecting hole 1102 to be connected to the outer needle rod 2201. Therefore, when the lead screw 110 performs a linear motion, the outer needle rod 2201 can be driven to move. For example, when the dial 1052 rotates clockwise, the lead screw 110 drives the outer needle rod 2201 to move in the direction close to the main needle tip 2203; when the dial 1052 rotates counterclockwise, the lead screw 110 drives the outer needle rod 2201 to move in the direction away from the main needle tip 2203, and vice versa.

[0077] As Figure 46 shown, the other end of the lead screw 110 is also provided with a receiving portion, and the above-mentioned pressure pad 131 and sealing ring 132 are sequentially arranged in the receiving portion.

[0078] Furthermore, as Figure 47 、 Figure 28 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 description below.

[0079] 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 spaced apart and are connected by a connecting baffle 2027. Among them, a needle tool groove 20261 is provided on the second baffle 2026. When multiple housings are buckled together, the needle tool grooves 20261 on multiple housings can enclose a needle tool hole 1092 for installing the needle tool 2, as Figure 47 and Figure 49 shown, the outer needle rod 2201 can be inserted through the needle tool hole 1092.

[0080] Please continue to refer to Figure 51 , the first baffle 2025 is also respectively provided with an arc section 20251 and a plane section 20252 connected to each other. When multiple housings are buckled together, the needle tool grooves 20261 on 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 through the lead screw hole 1091.

[0081] As Figure 45As shown, a platform 1101 is provided on the connecting portion 1104 of the lead screw 110. The platform 1101 is a planar 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 planar surface. Among them, the arc surface cooperates with the arc segment 20251 on the corresponding first baffle 2025, and the planar surface cooperates with the planar segment 20252 on the first baffle 2025. Thus, during the rotation of the lead screw 110, when the arc surface thereon rotates to the planar segment 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.

[0082] 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 movement distance of the lead screw 110 is when it moves to the end of the connecting portion 1104 of the lead screw 110 and fits with the second baffle 2026, thereby ensuring the safety of the outer needle rod 2201.

[0083] The platform 1101 on the connecting portion 1104, on the one hand, plays a guiding role when the lead screw 110 rotates to convert circular motion into linear motion; on the other hand, the platform 1101 can play the role of a reinforcing rib, thereby improving the strength of the first baffle 2025 and the second baffle 2026.

[0084] It can be understood that the outer needle rod connection hole 1102 in the connecting portion 1104 is coaxially arranged with the needle tool 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 tool groove 20261 and the outer needle rod connection hole 1102 and enter the interior of the housing mechanism 100.

[0085] Please refer to Figure 29 and Figure 33 , on one or several of the housings, a button slide groove 1012 can be provided. The button slide groove 1012 extends along the circumferential direction of the housing mechanism 100, and the button 1051 can move in the button slide groove 1012 (as Figure 47 shown), thereby driving the button cylinder 1052 to rotate.

[0086] In addition, first marking layers 1014, such as "ON" and "OFF", are respectively provided at positions corresponding to the two ends of the button slide groove 1012 on the housing, so as to indicate the opening or closing of the sub-needle outlet 2204.

[0087] 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, the second connecting rod 1054 is arranged in the chute with a smaller width, and the knob 1051 is arranged in the chute with a larger width, so as to restrict the movement path of the knob 1051.

[0088] Each sub-needle bundle 210 can be independently exhibited from the sub-needle exhibition outlet 2204, and the exhibition degree of each sub-needle bundle 210 is 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 40 shown, all the sub-needle bundles 210 are completely exhibited, so that the maximum ablation diameter of the radiofrequency ablation needle can reach 80 mm.

[0089] As Figure 42a shown, the main needle tip 2203 is constructed as a triangular tip structure, on which a main needle liquid injection hole 2032 is provided. The inside of the main needle 2202 is a hollow structure. The main needle 2202 is in fluid communication with the Figure 36 and Figure 37 shown main needle liquid injection tube 3, so that agents such as normal saline, injection anesthetic, and alcohol can be injected into the main needle 2202 through the main needle liquid injection tube 3 and enter the ablation area through the main needle liquid injection 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 at a position near the needle tip inside the main needle tip 2203 for monitoring the temperature of the tissue at the main needle 2202.

[0090] As Figure 50 and Figure 51 shown, the shells are spliced with each other in the circumferential direction to form a complete shell mechanism 100. As Figure 51 shown, taking the second shell 102 as an example, engaging parts 1021 are respectively arranged 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, so as to form a stable connection, and after the shells are mutually engaged, a shell mechanism 100 with relatively consistent external dimensions can be formed.

[0091] 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 28As 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.

[0092] As Figure 33 shown, viewing windows 1013 are respectively provided on each housing, corresponding to the position where the indicator light 701 is located. Therefore, the indicator light 701 can display its brightness through the viewing windows 1013.

[0093] A cable 5 is also connected to the control mechanism 7. The cable 5 extends from the proximal end of the housing mechanism 100 to the outside of the housing 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.

[0094] Embodiment 3 of the present invention also provides a radiofrequency ablation needle, which includes a housing mechanism 100 and a needle tool 2. The needle tool 2 includes the main needle assembly 220 and the sub-needle bundles 210 described above.

[0095] Example 4 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 bundles 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 drive 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.

[0096] 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 structure of one inlet and multiple outlets, and each of its outlets corresponds to a sub-needle bundle 210. Thus, the adjustment and closing of the liquid injection flow rate or velocity of any sub-needle bundle 210 can be achieved.

[0097] 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.

[0098] As Figure 52As shown, there are multiple liquid outlet pipes 402, and the number thereof corresponds one-to-one with the number of sub-needle bundles 210. One ends of the multiple liquid outlet pipes 402 away from the regulating valve 401 are respectively connected to a first joint 4021, and through the first joint 4021, each liquid outlet pipe 402 is respectively in fluid communication with the corresponding sub-needle bundle 210. More specifically, please refer to Figure 28 , and each liquid outlet pipe 402 is respectively connected to a sub-needle injection pipe 6 connected to the proximal end of each sub-needle bundle 210.

[0099] One end of the liquid inlet pipe 403 away from the regulating valve 401 is provided with a second joint 4031, and the liquid inlet pipe 403 can be connected to a syringe or an injection pump through the second joint 4031. By respectively connecting the second joint 4031 and the first joint 4021 to the liquid inlet pipe 403 and the liquid outlet pipe 402, 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).

[0100] As Figure 52 and Figure 53 shown, the liquid injection regulating mechanism 4 further includes a roller 404. A roller installation groove 4012 is provided in the regulating valve 401, and the roller 404 is installed in the roller installation groove 4012. The number of the rollers 404 and the roller installation grooves 4012 is the same as the number of the sub-needle bundles 210 to achieve individual control for each sub-needle bundle 210.

[0101] As Figure 55 shown, at 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 can be Arabic numerals such as "1", "2", etc., and 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.

[0102] As Figure 55 shown, at 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 medium flow rate or velocity in the pipe. As Figure 57 shown, a first rolling tooth 4041 is provided on the circumferential outer 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 59As shown, on both side walls of the roller installation groove 4012, there are respectively provided tooth groove channels 4013, and on the side walls of the tooth groove channels 4013, there are tooth grooves 4019. 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.

[0103] 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 an installation surface 4010. The parallel surface 4017 is substantially parallel to the upper wall of the roller installation groove 4012, and there is an included angle θ 1 between the inclined surface 4018 and the upper wall of the roller installation groove 4012, and the installation surface 4010 may have an included angle θ 2 with the upper wall of the installation groove 4012, which is smaller than θ 1 this.

[0104] 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 56 shown, the S3 stage is used for the installation of the roller 404; the S1 stage is used for the roller 404 to extrude the cross-section of the liquid delivery pipe 402, thereby realizing the adjustment of the flow rate or flow volume of the medium in the pipe; the S2 stage is used for the roller 404 to further extrude the cross-section of the liquid delivery pipe 402, thereby realizing the cut-off or closing of the flow of the medium in the pipe.

[0105] Tooth grooves 4019 are provided at positions corresponding to the parallel surface 4017 and the inclined surface 4018 on the tooth groove channel 4013, which can be engaged and positioned with the second rolling teeth 4042. Tooth grooves 4019 are not provided at positions corresponding to the installation surface 4010 on the tooth groove channel 4013 to facilitate the installation of the second rolling teeth 4042.

[0106] Embodiment 3 of the present invention also provides a radiofrequency ablation needle, which includes a liquid injection adjustment mechanism 4 and a needle tool 2. The needle tool 2 includes the main needle assembly 220 and the sub-needle bundle 210 described above, and the liquid injection adjustment mechanism 4 is in fluid communication with the sub-needle bundle 210.

[0107] Although the present invention has been described with reference to the preferred embodiments, various improvements 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 extension structure of a radiofrequency ablation needle, characterized in that: include: a sub-needle driving mechanism connected to the sub-needle bundle of the radiofrequency ablation needle, wherein the portion of the sub-needle bundle located between the sub-needle driving mechanism and the distal fixing portion 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 to pass through the distal fixing portion for expansion or to be retracted from the distal fixing portion; and The sub-needle anti-bending mechanism is located between the sub-needle driving mechanism and the distal fixing portion and is 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 constraint for the segmented sub-needle bundle.

2. The sub-needle extension structure of the radiofrequency ablation needle according to claim 1, characterized in that: 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 in the middle position of the segmented sub-needle bundle, thereby providing support and constraint for the segmented sub-needle bundle.

3. The sub-needle extension structure of the radiofrequency ablation needle according to claim 1 or 2, characterized in that: The sub-needle anti-bending mechanism comprises: A movable adjusting member, one end of which abuts against the outer wall of the segmented sub-needle bundle; and A series spring group is connected to the movable adjustment member, and 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 movable adjustment member so that it is always located in the middle position of the segmented sub-needle bundle.

4. The sub-needle extension structure of the radiofrequency ablation needle according to claim 3, characterized in that: The series spring group includes springs respectively located on opposite sides of the movable adjustment member, and the springs on both sides are respectively abutted against the two sides of the movable 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 part.

5. The sub-needle extension structure of the radiofrequency ablation needle according to claim 3, 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, and the first guide rod and / or the second guide rod respectively pass through the moving adjustment member and the sub-needle driving mechanism.

6. The sub-needle extension structure of the radiofrequency ablation needle according to claim 5, characterized in that: The movable adjustment member includes a pressing plate and an abutment portion, the first guide rod and / or the second guide rod respectively penetrate the pressing plate, one end of the abutment portion is connected to the pressing plate, and the other end abuts against the outer wall of the segmented sub-needle bundle.

7. The sub-needle extension structure of the radiofrequency ablation needle according to claim 5, characterized in that: The proximal end of the sub-needle bundle is communicated with a sub-needle injection tube, and the sub-needle injection tube is spirally wound on the first guide rod or the second guide rod.

8. The sub-needle extension structure of the radiofrequency ablation needle according to claim 1 or 2, characterized in that: 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 arranged in sequence along the circumference of the main needle assembly of the radiofrequency ablation needle; and each of the sub-needle bundles corresponds to a sub-needle driving mechanism and a sub-needle anti-bending mechanism.

9. The sub-needle extension structure of the radiofrequency ablation needle according to claim 8, characterized in that: The sub-needle bundle includes a sub-needle sleeve and a capillary, wherein the sub-needle sleeve covers a portion of the capillary, and an arc-shaped recessed portion is provided on a side of the sub-needle sleeve close to the main needle assembly, wherein the arc-shaped recessed portion is configured to be recessed toward the interior of the sub-needle sleeve and extend along the axial direction of the sub-needle sleeve.

10. The sub-needle extension structure of the radiofrequency ablation needle according to claim 9, characterized in that: The number of the capillaries is one or more, and at least one sub-needle temperature detection unit is disposed at the distal end of each capillary.

11. A radiofrequency ablation needle, characterized in that: A sub-needle extension structure of a radiofrequency ablation needle as described in any one of claims 1 to 10, further comprising a shell 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, the sub-needle bundle and the proximal side of the main needle assembly are both arranged in the shell mechanism, and the distal fixing portion is constructed as a radial baffle located inside the shell mechanism.

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