All-water cooling microwave ablation needle

Abstract

The utility model relates to an all-water cooling microwave ablation needle, and relates to the technical field of radio frequency ablation. The full-water cooling microwave ablation needle comprises the medium sleeve, the needle head and the needle body, and the groove is formed in the connector, so that the connector and the medium sleeve can be sealed through the sealing element in the groove; therefore, the phenomenon that the cooling medium gathers from the first cooling medium inflow channel or the first cooling medium backflow channel and flows to the needle head is avoided, and the microwave treatment effect can be guaranteed. And the cooling medium in the first cooling medium inflow channel is returned to the first cooling medium backflow channel at the end part of the connector, so that the far end of the needle head can be cooled, and the temperature of the needle head is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency ablation, in particular to a full-through water-cooled microwave ablation needle. Background Art

[0002] Microwave ablation technology uses microwaves to quickly heat biological tissues, causing tumor tissues to undergo thermal denaturation and necrosis, thereby achieving the purpose of treating tumors. During microwave ablation surgery using a microwave ablation needle, the needle tip of the microwave ablation needle, as a microwave transmitting antenna, will generate a large amount of heat, and the heat of the needle tip is difficult to release, resulting in the temperature of the position where the tail of the needle tip is connected to the cable being too high, which may burn the inner conductor of the cable, causing the problem of the needle tip falling off; and if the temperature at the center of the needle tip is high, it will also affect the tissue absorption of the ablation site after ablation. Therefore, a cooling medium channel is generally set in the microwave ablation needle, and a portion of the heat is taken away by the flow of the cooling medium therein. In order to reduce the temperature of the needle tip as much as possible, the existing microwave ablation needle does not contact the dielectric sleeve, and the space between the two can form a circulation channel for the cooling medium. However, the connection between the needle tip and the dielectric sleeve depends on the contact and cooperation between the outer wall of the needle tip and the inner wall of the dielectric sleeve, that is, the cooperation between the two curved surfaces. Therefore, there may be a gap that allows the cooling medium to flow to the tip of the needle tip, thereby affecting the treatment effect. Utility Model Content

[0003] The utility model provides a full-through water-cooled microwave ablation needle, which is used to solve at least one of the above-mentioned technical problems.

[0004] The utility model provides a full-through water-cooled microwave ablation needle, comprising:

[0005] A medium sleeve, wherein a first cooling medium inlet channel and a first cooling medium return channel are provided in the medium sleeve;

[0006] a needle connected to the proximal end of the dielectric sleeve, the needle comprising a needle tip and a connector disposed at the distal end of the needle tip, the connector extending into the dielectric sleeve, the outer wall of the connector contacting the inner wall of the dielectric sleeve; and

[0007] A needle body connected to the distal end of the medium sleeve, wherein the cooling medium in the first cooling medium inlet channel is turned back to the first cooling medium return channel at the distal end of the needle head;

[0008] A sealing element or a sealing medium is further arranged between the connector and the medium sleeve, and a groove extending along its circumference is arranged on the connector, and the groove is used to accommodate the sealing element or the sealing medium.

[0009] In one embodiment, a difference between the radial cross-sectional areas of the first cooling medium inlet channel and the first cooling medium return channel is within a preset range.

[0010] In one embodiment, the needle body includes a semi-rigid cable, an inner needle rod and an outer needle rod arranged in sequence from the inside to the outside, the dielectric sleeve is connected to the proximal end of the outer needle rod, and the semi-rigid cable extends into the dielectric sleeve;

[0011] A second cooling medium inlet channel is formed between the inner wall of the inner needle rod and the outer wall of the semi-rigid cable, and a second cooling medium return channel is formed between the outer wall of the inner needle rod and the outer wall of the outer needle rod;

[0012] Wherein, the first cooling medium inlet channel is connected to the second cooling medium inlet channel; the first cooling medium return channel is connected to the second cooling medium return channel.

[0013] In one embodiment, an arc-shaped extension portion is provided at the proximal end of the inner needle rod, and the arc-shaped extension portion extends between the dielectric sleeve and the semi-rigid cable;

[0014] The first cooling medium inlet channel includes a space between the inner wall of the dielectric sleeve, the inner wall of the arc-shaped extension and the outer wall of the semi-rigid cable;

[0015] The second cooling medium return channel includes a space between an outer wall of the arc-shaped extension portion and an inner wall of the medium sleeve.

[0016] In one embodiment, the distal end of the medium sleeve abuts against the connection between the arc-shaped extension and the inner needle rod, so that the first cooling medium inlet channel is connected to the second cooling medium inlet channel.

[0017] In one embodiment, one or more first capillaries are provided at the proximal end of the inner needle rod, and the one or more first capillaries extend between the dielectric sleeve and the semi-rigid cable;

[0018] The first cooling medium inlet channel includes the inner space of the one or more first capillaries;

[0019] The first cooling medium return channel includes a space between an inner wall of the dielectric sleeve, an outer wall of the one or more first capillaries, and an outer wall of the semi-rigid cable.

[0020] In one embodiment, the distal end of the dielectric sleeve is at a preset distance from the connection point between the first capillary tube and the proximal end of the inner needle shaft.

[0021] In one embodiment, the needle body comprises a semi-rigid cable, one or more inner needle rods arranged side by side with the semi-rigid cable, and an outer needle rod sleeved outside the semi-rigid cable and the inner needle rods, and the proximal end of the outer needle rod is connected to the dielectric sleeve;

[0022] Wherein, the inner needle rod is configured as a capillary tube, and the inner space of the inner needle rod forms the first cooling medium inlet channel and the second cooling medium inlet channel;

[0023] The space between the outer wall of the semi-rigid cable and the inner wall of the dielectric sleeve forms a first cooling medium reflux channel, and the space between the outer wall of the semi-rigid cable, the outer wall of the inner needle rod and the inner wall of the outer needle rod forms a second cooling medium reflux channel, and the first cooling medium reflux channel is connected to the second cooling medium reflux channel.

[0024] In one embodiment, an inner conductor is disposed in the semi-rigid cable, and the inner conductor extends into the needle and is electrically connected to the needle.

[0025] In one embodiment, it further comprises a cooling medium storage device, wherein the cooling medium storage device is disposed at the distal end of the needle body;

[0026] The cooling medium storage device comprises a cooling medium inlet cavity and a cooling medium return cavity, the distal end of the cooling medium inlet cavity is provided with a radio frequency connector, and the proximal end of the cooling medium return cavity is provided with a cooling liquid cavity front end cover;

[0027] The cooling medium inlet cavity is communicated with the second cooling medium inlet channel, and the cooling medium return cavity is communicated with the second cooling medium return channel.

[0028] Compared with the prior art, the advantage of the utility model lies in that, by arranging a groove on the connecting head, the connecting head and the medium sleeve can be sealed by the sealing element in the groove, thereby avoiding the phenomenon that the cooling medium flows from the first cooling medium inlet channel or the first cooling medium return channel to the needle, thereby ensuring the effect of microwave therapy; and because the cooling medium in the first cooling medium inlet channel is returned to the first cooling medium return channel at the end position of the connecting head, the distal end of the needle can also be cooled, thereby reducing the temperature of the needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0030] Figure 1 is an axial cross-sectional view of a full-through water-cooled microwave ablation needle in an embodiment of the utility model;

[0031] Figure 2 is an axial cross-sectional view of the needle body in Example 1 of the utility model;

[0032] Figure 3 is an axial cross-sectional view of the cooling medium storage device in Example 1 of the utility model;

[0033] Figure 4 is a radial cross-sectional view of the dielectric sleeve in Example 1 of the utility model;

[0034] Figure 5 It is a schematic diagram of the three-dimensional structure of the inner needle rod in Example 1 of the utility model;

[0035] Figure 6 is an axial cross-sectional view of the needle body in Example 2 of the present utility model;

[0036] Figure 7a is a radial cross-sectional view of the dielectric sleeve in Example 2 of the utility model;

[0037] Figure 7b It is a partial three-dimensional structural schematic diagram of the dielectric sleeve in Example 2 of the utility model;

[0038] Figure 8 is an axial cross-sectional view of the needle body in Example 3 of the utility model;

[0039] Fig. 9 It is an axial cross-sectional view of the cooling medium storage device in Example 3 of the present utility model.

[0040] Reference numerals:

[0041] 200, needle body; 300, cooling medium storage device;

[0042] 201, needle; 202, dielectric sleeve; 203, outer needle rod; 204, inner needle rod; 205, semi-rigid cable; 2043, through hole;

[0043] 2011, needle tip; 2012, connector; 2013, groove;

[0044] 2041, arc-shaped extension; 2042, first capillary; 2003, gap;

[0045] 2051, inner conductor; 2052, outer conductor; 2053, dielectric layer;

[0046] 2001, second cooling medium inlet channel; 2002, second cooling medium return channel;

[0047] 4001, first cooling medium inlet channel; 4002, first cooling medium return channel;

[0048] 3001, cooling medium inflow chamber; 3002, cooling medium return chamber;

[0049] 302, radio frequency connector; 303, front end cover of the cooling liquid chamber. DETAILED DESCRIPTION

[0050] The utility model will be further described below in conjunction with the accompanying drawings.

[0051] like Figure 1 As shown, the utility model provides a full-through water-cooled microwave ablation needle, including a needle body 200 , a dielectric sleeve 202 and a cooling medium storage device 300 respectively arranged at the proximal end of the needle body 200 , and a needle head 201 arranged at the proximal end of the dielectric sleeve 202 .

[0052] The dielectric sleeve 202 is a non-metallic tubular structure, so its overall insulating structure can be used as a window for microwave emission. The needle 201 can be used for puncture on the one hand, and on the other hand, it is connected to the semi-rigid cable 205, which can transfer microwave energy to the needle 201, so the needle 201 can be used as a microwave antenna.

[0053] like Figure 2 , Figure 6 and Figure 8 As shown, the needle 201 is connected to the proximal end of the medium sleeve 202, and the needle 201 includes a needle tip 2011 and a connector 2012 arranged at the distal end of the needle tip 2011, wherein the needle tip 2011 is used for puncture, and the connector 2012 extends into the medium sleeve 202, and the outer wall of the connector 2012 contacts the inner wall of the medium sleeve 202.

[0054] The medium sleeve 202 is provided with a first cooling medium inlet channel 4001 and a first cooling medium return channel 4002. Since the connector 2012 closes the proximal end of the medium sleeve 202, the cooling medium in the first cooling medium inlet channel 4001 is turned back to the first cooling medium return channel 4002 at the distal end of the needle 201. The cooling medium flowing in the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 may be cooling water.

[0055] A sealing element or sealing medium is provided between the connector 2012 and the medium sleeve 202. Figure 2 As shown, the connector 2012 is provided with a groove 2013 extending along its circumferential direction, and the groove 2013 is used to accommodate a sealing element or a sealing medium. After the connector 2012 is inserted into the medium sleeve 202, the sealing element can seal the connector 2012 and the medium sleeve 202 with each other in the circumferential direction, thereby ensuring that the cooling medium in the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 will not flow to the needle tip 2011 and affect the treatment effect.

[0056] The sealing element may be, for example, a sealing ring, and the sealing medium may be, for example, an adhesive (glue, etc.). After curing, the adhesive (glue, etc.) will also improve the connection strength between the connector 2012 and the medium sleeve 202 .

[0057] The groove 2013 may be an annular groove extending along the entire circumference of the connector 2012 , or the groove 2013 may be a plurality of grooves spaced apart in the circumference of the connector 2012 .

[0058] The depth (i.e., radial distance) of the groove 2013 cannot be too large, otherwise it will affect the strength of the connector 2012; the depth of the groove 2013 cannot be too small, otherwise it will not provide enough accommodation space for the adhesive, thereby affecting the sealing between the connector 2012 and the dielectric sleeve 202. Therefore, the depth of the groove 2013 is preferably 0.2 mm-0.4 mm.

[0059] The first cooling medium inlet channel 4001 is used to allow the cooling medium to flow in, that is, the cooling medium flows from the distal end to the proximal end of the medium sleeve 202. The cooling medium is turned back at the end of the connector 2012 and returns to the first cooling medium return channel 4002 and flows out of the medium sleeve 202. Therefore, in order to keep the flow rates of the inlet and return flow roughly the same, the radial cross-sectional areas of the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 are made the same or similar, so that the medium sleeve 202 can be evenly cooled.

[0060] The above-mentioned “the radial cross-sectional areas of the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 are the same or similar” means that the difference in radial cross-sectional areas between the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 is within a preset range, and the preset range may be, for example, between 0 mm and 0.1 mm.

[0061] The first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 may be implemented in a variety of ways, which will be described in detail with specific embodiments below.

[0062] Example 1

[0063] like Figure 2As shown, the needle body 200 includes a semi-rigid cable 205, an inner needle rod 204 and an outer needle rod 203 arranged in sequence from the inside to the outside. A second cooling medium inlet channel 2001 is formed between the inner wall of the inner needle rod 204 and the outer wall of the semi-rigid cable 205, and a second cooling medium return channel 2002 is formed between the outer wall of the inner needle rod 204 and the outer wall of the outer needle rod 203. The second cooling medium inlet channel 2001 and the second cooling medium return channel 2002 are both connected to the cooling medium storage device 300, so as to receive the cooling medium output from the cooling medium storage device 300 and return the cooled medium to the cooling medium storage device 300.

[0064] Among them, the first cooling medium inlet channel 4001 is connected to the second cooling medium inlet channel 2001; the first cooling medium return channel 4002 is connected to the second cooling medium return channel 2002.

[0065] like Figure 5 As shown, the inner needle rod 204 is constructed as a cylindrical structure, and an arc-shaped extension portion 2041 is provided at its proximal end. The arc-shaped extension portion 2041 is constructed as a semi-cylindrical structure, which extends along the axial direction of the inner needle rod 204, but is only connected to a part of the circumference of the inner needle rod 204, so that a "gap" is formed between the arc-shaped extension portion 2041 and the end of the inner needle rod 204. The arc-shaped extension portion 2041 is made of non-metallic material, or both the arc-shaped extension portion 2041 and the inner needle rod 204 can be made of non-metallic material.

[0066] Please continue to see Figure 2 The arc-shaped extension portion 2041 extends along the axial direction of the inner needle rod 204 to between the dielectric sleeve 202 and the semi-rigid cable 205. Figure 5 As shown, the arc-shaped extension portion 2041 divides the portion between the dielectric sleeve 202 and the semi-rigid cable 205 into two parts, one of which is the space between the inner wall of the dielectric sleeve 202, the inner wall of the arc-shaped extension portion 2041 and the outer wall of the semi-rigid cable 205, and this space is the first cooling medium inlet channel 4001; the other part is the space between the outer wall of the arc-shaped extension portion 2041 and the inner wall of the dielectric sleeve 202, and this space is the second cooling medium return channel 2002.

[0067] Furthermore, in order to ensure that the first cooling medium inlet channel 4001 and the second cooling medium inlet channel 2001 are connected, as Figure 2 As shown, the distal end of the medium sleeve 202 abuts against the connection (intersection) of the arc-shaped extension portion 2041 and the inner needle rod 204 , so that the first cooling medium inlet channel 4001 is connected to the second cooling medium inlet channel 2001 .

[0068] Therefore, through the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 in the dielectric sleeve 202, the cooling range of the cooling medium is moved forward toward the proximal end of the full-through water-cooled microwave ablation needle, and the cooling area can cover the entire axial direction of the dielectric sleeve 202 and the connector 2012 of the needle 201, thereby reducing the temperature of the tail of the needle 201 (connector 2012), thereby improving the problems of needle breakage and tissue charring caused by high temperature.

[0069] The distal end of the semi-rigid cable 205 is connected to the RF connector 302, and the proximal end thereof is connected to the needle 201 to transfer microwave energy from the RF connector 302 to the needle 201. The semi-rigid cable 205 includes an inner conductor 2051, an outer conductor 2052 coaxially sleeved on the inner conductor 2051, and a dielectric layer 2053 coaxially covering the outer conductor 2052. The inner conductor 2051 is inserted into the connector 2012 of the needle 201 to be connected to the needle 201.

[0070] like Figure 3 As shown, the cooling medium storage device 300 includes a cooling medium inlet cavity 3001 and a cooling medium return cavity 3002; the cooling medium inlet cavity 3001 is connected to the second cooling medium inlet channel 2001, and the cooling medium return cavity 3002 is connected to the second cooling medium return channel 2002. Therefore, the cooling medium in the cooling medium inlet cavity 3001 can flow to the second cooling medium inlet channel 2001, and then flow to the first cooling medium inlet channel 4001 connected to the second cooling medium inlet channel 2001, so as to cool the needle body 200 and the medium sleeve 202, and the cooled cooling medium returns to the first cooling medium return channel 4002, and then flows to the second cooling medium return channel 2002 connected to the first cooling medium return channel 4002, and finally collected in the cooling medium return cavity 3002.

[0071] The cooling medium storage device 300 further includes a cooling liquid cavity front end cover 303 and a radio frequency connector 302. The cooling liquid cavity front end cover 303 is arranged at the proximal end of the cooling medium return cavity 3002, and the radio frequency connector 302 is arranged at the distal end of the cooling medium inlet cavity 3001. The cooling medium inlet cavity 3001 is closer to the distal end than the cooling medium return cavity 3002, so the inner needle rod 204 and the semi-rigid cable 205 both penetrate the cooling medium return cavity 3002 and extend into the cooling medium inlet cavity 3001, and the semi-rigid cable 205 is conductively connected to the radio frequency connector 302 at the distal end of the cooling medium return cavity 3002, thereby realizing microwave energy transmission; the outer needle rod 203 extends into the cooling medium inlet cavity 3001.

[0072] Example 2

[0073] The differences between the second embodiment and the first embodiment will be described in detail below, and the similarities will not be repeated here.

[0074] The difference between this embodiment 2 and the above-mentioned embodiment 1 is that this embodiment 2 no longer constructs the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 through the arc extension portion 2041, but constructs the first cooling medium inlet channel 4001 and the first cooling medium return channel 4002 through the first capillary 2042.

[0075] Specifically, if Figure 6 and Figure 7a As shown, one or more first capillaries 2042 are provided at the proximal end of the inner needle rod 204, and the one or more first capillaries 2042 extend between the dielectric sleeve 202 and the semi-rigid cable 205. Therefore, the one or more first capillaries 2042 also divide the space between the dielectric sleeve 202 and the semi-rigid cable 205.

[0076] like Figure 7a and Figure 7b As shown, the inner space of one or more first capillaries 2042 forms the first cooling medium inlet channel 4001. For example, when there is one first capillary 2042, the first cooling medium inlet channel 4001 is the inner space of the first capillary 2042; when there are multiple first capillaries 2042, the first cooling medium inlet channel 4001 is the sum of the inner spaces of multiple first capillaries 2042. The space between the inner wall of the dielectric sleeve 202, the outer wall of one or more first capillaries 2042, and the outer wall of the semi-rigid cable 205 is the first cooling medium return channel 4002. Therefore, the number of first capillaries 2042 can be set so that the sum of the cross-sectional areas of each first capillary 2042 is equal to the cross-sectional area of ​​the first cooling medium return channel 4002.

[0077] The outer diameter of the first capillary 2042 is slightly smaller than the inner diameter of the dielectric sleeve 202, so it can be inserted into the dielectric sleeve 202. The first capillary 2042 is connected to the proximal end of the inner needle rod 204. If multiple first capillary tubes 2042 are provided, the multiple first capillary tubes 2042 can be arranged at intervals along the circumference of the proximal end of the inner needle rod 204. Therefore, it can be understood that the proximal end edge of the inner needle rod 204 is connected to multiple first capillary tubes 2042, such as Figure 7b As shown, the middle of the proximal end of the inner needle rod 204 has a through hole 2043 connected to the interior, and the inner diameter of the through hole is slightly smaller than the outer diameter of the semi-rigid cable 205, so that it can be put on the semi-rigid cable 205 and fit tightly with the semi-rigid cable 205 to ensure the sealing of the second cooling medium inlet channel 2001.

[0078] like Figure 6As shown, there is a certain distance between the distal end of the medium sleeve 202 and the connection between the proximal end of the first capillary tube 2042 and the inner needle rod 204, that is, a gap 2003 is formed between the distal end of the medium sleeve 202 and the connection between the first capillary tube 2042 and the inner needle rod 204, and the gap 2003 is used for the circulation of the cooling medium. The cooling medium in the first cooling medium return channel 4002 can flow into the second cooling medium return channel 2002 through the gap 2003.

[0079] By arranging a first capillary 2042 at the proximal end of the inner needle rod 204 to construct a first cooling medium inlet channel 4001 and a first cooling medium return channel 4002, the diameter of the overall medium sleeve 202 can be increased, and the full-through water-cooled microwave ablation needle can be made thinner as a whole, thereby facilitating the formation of a smaller puncture size.

[0080] Example 3

[0081] The differences between the present embodiment 3 and the above-mentioned embodiment 1 will be described in detail below, and the similarities will not be repeated here.

[0082] The difference between the present embodiment 3 and the above-mentioned embodiment 1 is that the inner needle rod 204 of the present embodiment 3 is integrally constructed as a capillary tube, so the inner needle rod 204 has a thinner diameter, and it can be arranged side by side with the semi-rigid cable 205 inside the outer needle rod 203 (such as Figure 8 As shown), the inner needle rod 204 does not form a sleeve relationship with the semi-rigid cable 205.

[0083] The proximal ends of the inner needle rod 204 and the semi-rigid cable 205 both extend into the dielectric sleeve 202, so the first cooling medium inlet channel 4001 and the second cooling medium inlet channel 2001 are both formed by the internal space of the inner needle rod 204. More specifically, the first cooling medium inlet channel 4001 is formed by the portion of the inner needle rod 204 located in the dielectric sleeve 202, and the second cooling medium inlet channel 2001 is formed by the portion of the inner needle rod 204 located in the outer needle rod 203.

[0084] It can be understood that the space between the outer wall of the semi-rigid cable 205 and the inner wall of the dielectric sleeve 202 forms the first cooling medium return channel 4002, and the space between the outer wall of the semi-rigid cable 205, the outer wall of the inner needle rod 204 and the inner wall of the outer needle rod 203 forms the second cooling medium return channel 2002. In order to ensure that the first cooling medium return channel 4002 is connected to the second cooling medium return channel 2002, as shown in FIG. Figure 8 As shown, the distal end of the dielectric sleeve 202 abuts against the step surface of the proximal end of the outer needle rod 203 .

[0085] The inner needle rod 204 in the present embodiment 3 is integrally constructed as a capillary tube, which is convenient for production and manufacturing. The number of the inner needle rods 204 can also be multiple, and the sum of the internal spaces of the multiple inner needle rods 204 is the first cooling medium inlet channel 4001. Therefore, the number of the inner needle rods 204 can be selected based on the cross-sectional area of ​​each inner needle rod 204 being equal to the cross-sectional area of ​​the first cooling medium return channel 4002.

[0086] The inner needle rod 204 is made of non-metallic material.

[0087] In addition, if Fig. 9 As shown, the inner needle rod 204 and the semi-rigid cable 205 also penetrate the cooling medium reflux chamber 3002 and extend into the cooling medium inlet chamber 3001. The semi-rigid cable 205 is connected to the RF connector 302 at the distal end of the cooling medium inlet chamber 3001, and the proximal end of the cooling medium reflux chamber 3002 is sealed by the front end cover 303 of the cooling liquid chamber.

[0088] Therefore, in each embodiment of the utility model, by constructing the first cooling medium return channel 4002 and the first cooling medium return channel 4002 in the dielectric sleeve 202, the return position of the cooling medium channel is moved forward from the tail end of the traditional dielectric sleeve to the tail end of the needle, thereby reducing the temperature of the connector 2012 at the tail end of the needle and the dielectric sleeve 202, thereby improving the needle breakage caused by high temperature of the needle 201 and the charring problem of the tissue near the dielectric sleeve 202 caused by high temperature; and effectively preventing the problem of microwave current flowing to the rear end due to severe charring, thereby improving the sphericity of the ablation morphology, facilitating doctors to plan surgeries, reducing damage to normal tissues, and improving treatment effects and surgical planning efficiency.

[0089] In the above, unless otherwise specified, the “distal end” refers to an end farther from the needle tip 2011 of the needle body 200 , and the “proximal end” refers to an end closer to the needle tip 2011 of the needle body 200 .

[0090] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A full-through water-cooled microwave ablation needle, characterized in that: include: A medium sleeve (202), wherein the medium sleeve (202) is provided with a first cooling medium inlet channel (4001) and a first cooling medium return channel (4002); A needle (201) connected to the proximal end of the dielectric sleeve (202), the needle (201) comprising a needle tip (2011) and a connector (2012) disposed at the distal end of the needle tip (2011), the connector (2012) extending into the dielectric sleeve (202) and connected to the dielectric sleeve (202); and A needle body (200) connected to the distal end of the medium sleeve (202), wherein the cooling medium in the first cooling medium inlet channel (4001) is folded back to the first cooling medium return channel (4002) at the end position of the connector (2012); A sealing element or a sealing medium is further provided between the connector (2012) and the medium sleeve (202), and a groove (2013) extending along its circumference is provided on the connector (2012), and the groove (2013) is used to accommodate the sealing element or the sealing medium.

2. The full-through water-cooled microwave ablation needle according to claim 1, characterized in that: The difference between the radial cross-sectional areas of the first cooling medium inlet channel (4001) and the first cooling medium return channel (4002) is within a preset range.

3. The full-through water-cooled microwave ablation needle according to claim 1 or 2, characterized in that: The needle body (200) comprises a semi-rigid cable (205), an inner needle rod (204) and an outer needle rod (203) which are arranged in sequence from the inside to the outside, the dielectric sleeve (202) is connected to the proximal end of the outer needle rod (203), and the semi-rigid cable (205) extends into the dielectric sleeve (202); A second cooling medium inlet channel (2001) is formed between the inner wall of the inner needle rod (204) and the outer wall of the semi-rigid cable (205), and a second cooling medium return channel (2002) is formed between the outer wall of the inner needle rod (204) and the outer wall of the outer needle rod (203); The first cooling medium inlet channel (4001) is connected to the second cooling medium inlet channel (2001); and the first cooling medium return channel (4002) is connected to the second cooling medium return channel (2002).

4. The full-through water-cooled microwave ablation needle according to claim 3, characterized in that: An arc-shaped extension portion (2041) is provided at the proximal end of the inner needle rod (204), and the arc-shaped extension portion (2041) extends between the dielectric sleeve (202) and the semi-rigid cable (205); The first cooling medium inlet channel (4001) includes a space between the inner wall of the dielectric sleeve (202), the inner wall of the arc-shaped extension (2041), and the outer wall of the semi-rigid cable (205); The second cooling medium return channel (2002) comprises a space between the outer wall of the arc-shaped extension portion (2041) and the inner wall of the medium sleeve (202).

5. The full-through water-cooled microwave ablation needle according to claim 4, characterized in that: The distal end of the medium sleeve (202) abuts against the connection between the arc-shaped extension portion (2041) and the inner needle rod (204), so that the first cooling medium inlet channel (4001) is connected to the second cooling medium inlet channel (2001).

6. The full-through water-cooled microwave ablation needle according to claim 3, characterized in that: One or more first capillaries (2042) are provided at the proximal end of the inner needle rod (204), and the one or more first capillaries (2042) extend between the dielectric sleeve (202) and the semi-rigid cable (205); The first cooling medium inlet channel (4001) includes the inner space of the one or more first capillaries (2042); The first cooling medium return channel (4002) includes the space between the inner wall of the dielectric sleeve (202), the outer wall of the one or more first capillaries (2042), and the outer wall of the semi-rigid cable (205).

7. The full-through water-cooled microwave ablation needle according to claim 6, characterized in that: A preset distance exists between the distal end of the dielectric sleeve (202) and the connection point between the first capillary tube (2042) and the proximal end of the inner needle rod (204).

8. The full-through water-cooled microwave ablation needle according to claim 1, characterized in that: The needle body (200) comprises a semi-rigid cable (205), one or more inner needle rods (204) arranged side by side with the semi-rigid cable (205), and an outer needle rod (203) sleeved outside the semi-rigid cable (205) and the inner needle rod (204), and the proximal end of the outer needle rod (203) is connected to the dielectric sleeve (202); The inner needle rod (204) is configured as a capillary tube, and the inner space of the inner needle rod (204) forms the first cooling medium inlet channel (4001) and the second cooling medium inlet channel (2001); The space between the outer wall of the semi-rigid cable (205) and the inner wall of the dielectric sleeve (202) forms a first cooling medium return channel (4002), and the space between the outer wall of the semi-rigid cable (205), the outer wall of the inner needle rod (204) and the inner wall of the outer needle rod (203) forms a second cooling medium return channel (2002), and the first cooling medium return channel (4002) is connected to the second cooling medium return channel (2002).

9. The full-through water-cooled microwave ablation needle according to claim 3, characterized in that: The semi-rigid cable (205) is provided with an inner conductor (2051), and the inner conductor (2051) extends into the needle (201) and is electrically connected to the needle (201).

10. The full-through water-cooled microwave ablation needle according to claim 3, characterized in that: It also includes a cooling medium storage device (300), wherein the cooling medium storage device (300) is arranged at the distal end of the needle body (200); The cooling medium storage device (300) comprises a cooling medium inlet cavity (3001) and a cooling medium return cavity (3002), the distal end of the cooling medium inlet cavity (3001) is provided with a radio frequency connector (302), and the proximal end of the cooling medium return cavity (3002) is provided with a cooling liquid cavity front end cover (303); The cooling medium inlet cavity (3001) is in communication with the second cooling medium inlet channel (2001), and the cooling medium return cavity (3002) is in communication with the second cooling medium return channel (2002).

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