Circulating cooling structure of radiofrequency ablation needle

Abstract

The utility model discloses a circulating cooling structure of a radiofrequency ablation needle, which comprises a two-way joint, a water inlet pipe, a water outlet pipe, a backflow main flow channel, a water inlet flow channel and a water outlet flow channel, the water inlet pipe is fixedly mounted in the water inlet pipe mounting groove, and the water outlet pipe is fixedly mounted in the water outlet pipe mounting groove; the water outlet pipe mounting groove is connected with the backflow main runner through the water outlet branch runner; the needle body comprises an inner pipe, an outer pipe and a needle tip, one end of the inner pipe penetrates through the water outlet flow channel and then is fixedly installed in the water inlet flow channel, the outer pipe is sleeved outside the inner pipe, one end of the outer pipe is fixedly installed in the water outlet flow channel, the needle tip is fixedly installed on the outer pipe, a notch is formed in the end portion of the inner pipe in the axis direction, and the end face of the inner pipe makes contact with the back face of the needle tip. Compared with the prior art, the radiofrequency ablation electrode solves the problems that a liquid circulation fluid channel of an existing radiofrequency ablation electrode is large in size, and fluid flow resistance is large.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency ablation, in particular to a circulation cooling structure of a radio frequency ablation needle. Background Art

[0002] The water cooling device in the needle-shaped radiofrequency ablation electrode is one of the key components of the needle-shaped radiofrequency ablation electrode. Its function is to ensure that low-temperature cooling water circulates inside the needle-shaped radiofrequency ablation electrode so that the target tissue around the ablation electrode needle can be cooled. For example, Chinese Patent 200420021925.6 discloses a water cooling device for a needle-shaped radiofrequency ablation electrode, wherein the support frame is fixedly connected to the water storage frame and is integrally embedded in the handle. The cavity in the water storage frame forms a cooling water reflux pool. The radiofrequency ablation electrode needle is fixed in the middle slot hole at the front end of the water storage frame and is led out from the front end of the handle. The built-in water inlet steel pipe of the radiofrequency ablation electrode needle passes through the water storage frame and is inserted into the middle slot hole at the front end of the support frame to communicate with the water inlet hose. The water outlet hose communicates with the reflux pool through the side slot hole of the support frame. The cooling water enters from the water inlet hose and flows into the ablation electrode needle through the built-in water diversion steel pipe, so that the cooling water fills it, so that the target tissue around the ablation electrode needle is fully cooled. The cooling water after heat exchange first returns to the cooling water reflux pool, and then flows back to the circulating cooling water equipment through the water outlet hose. The cooling water reflux pool is not only conducive to collecting the cooling water after heat exchange, but also can effectively reduce the water pressure in the ablation electrode needle.

[0003] In the liquid circulation channel structure of the existing radiofrequency ablation electrode, the multi-channel structure joint used to connect the inlet and outlet pipes is large in size, the overall volume of the liquid circulation fluid channel is large, the fluid flow resistance is large, and it is difficult to control the volume of the device. Utility Model Content

[0004] The utility model aims to provide a circulation cooling structure for a radio frequency ablation needle to solve the problems of large volume of the liquid circulation fluid channel and large fluid flow resistance of the existing radio frequency ablation electrode.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a circulating cooling structure of a radiofrequency ablation needle, comprising:

[0006] A two-way joint, comprising an inlet pipe mounting groove, an outlet pipe mounting groove, a return flow main channel, an inlet flow channel and an outlet flow channel, wherein the inlet pipe is fixedly mounted in the inlet pipe mounting groove, the outlet pipe is fixedly mounted in the outlet pipe mounting groove, the inlet flow channel and the outlet flow channel are arranged on both sides of the return flow main channel, the diameter of the inlet flow channel is smaller than the diameter of the outlet flow channel, and the outlet pipe mounting groove is connected to the return flow main channel through the outlet branch flow channel;

[0007] The needle body comprises an inner tube, an outer tube and a needle tip. One end of the inner tube passes through the water outlet channel and is fixedly installed in the water inlet channel. The outer tube is sleeved outside the inner tube. One end of the outer tube is fixedly installed in the water outlet channel. The needle tip is fixedly installed on the outer tube. A notch is arranged along the axial direction at the end of the inner tube, and the end face of the inner tube contacts the back of the needle tip.

[0008] As a further description of the above technical solution:

[0009] The two-way joint comprises a first shell and a second shell. The second shell is inserted into a mounting groove on the first shell. The water inlet pipe mounting groove is arranged on the second shell, and the water outlet flow channel is arranged on the first shell.

[0010] As a further description of the above technical solution:

[0011] A blind hole is arranged on the back of the needle tip.

[0012] As a further description of the above technical solution:

[0013] The ratio of the flow channel cross-sectional area between the inner tube and the outer tube is 1:1 to 1:1.2.

[0014] As a further description of the above technical solution:

[0015] The inner tube is a stainless steel tube or an organic polymer tube.

[0016] As a further description of the above technical solution:

[0017] The outer tube is a stainless steel tube.

[0018] As a further description of the above technical solution:

[0019] The surface of the outer tube is provided with arc-shaped grooves arranged in an array.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] 1. In the utility model, the volume of the two-way joint is smaller, the overall volume of the circulation channel is reduced, the cross-sectional area of ​​the channel changes gradually without large mutations, and the number of bends is reduced to reduce the flow resistance of the fluid.

[0022] 2. In the utility model, the notch arranged along the axial direction at the end of the inner tube facilitates the flow of fluid in a narrow area when the cooling liquid begins to flow back at the end of the inner tube, thereby improving the circulation efficiency and avoiding excessive impact caused by the transformation of the liquid from high speed to low speed, which may cause the needle to move. In actual clinical applications, it can reduce the ablation of unexpected soft tissues and improve the ablation efficiency of target tissues.

[0023] 3. In the present invention, a blind hole is provided on the back of the needle tip, which allows the fluid to enter the interior of the needle tip, thereby increasing the contact area between the cooling liquid and the needle tip and improving the heat exchange efficiency.

[0024] 4. In the utility model, the ratio of the flow channel cross-sectional area of ​​the inner tube to that of the outer tube is 1:1 to 1:1.2, which avoids the needle body from moving due to a sudden change in the cross-sectional area and controls the stability of the fluid flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The present invention is a schematic diagram of the structure of a circulating cooling structure of a radiofrequency ablation needle.

[0027] Figure 2 A schematic diagram of the liquid circulation of a circulating cooling structure of a radiofrequency ablation needle.

[0028] Figure 3 A schematic diagram of the structure of the needle body in the circulating cooling structure of a radiofrequency ablation needle Figure 1 .

[0029] Figure 4 A schematic diagram of the structure of the needle body in the circulating cooling structure of a radiofrequency ablation needle Figure 2 .

[0030] Figure 5 This is a schematic diagram of the structure of a bidirectional joint scheme 1 in a circulating cooling structure of a radiofrequency ablation needle.

[0031] Figure 6 This is a schematic diagram of the structure of the second bidirectional joint scheme in the circulating cooling structure of a radiofrequency ablation needle.

[0032] Legend:

[0033] 1. Two-way joint; 11. Water inlet pipe mounting groove; 12. Water outlet pipe mounting groove; 121. Water outlet branch channel; 13. Return main channel; 14. Water inlet channel; 15. Water outlet channel; 18. Second shell; 19. First shell; 191. Mounting groove; 2. Needle body; 21. Inner tube; 211. Notch; 22. Outer tube; 23. Needle tip; 231. Blind hole; 8. Water outlet pipe; 9. Water inlet pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] See also Figure 1-5 The utility model provides a technical solution: a circulating cooling structure of a radiofrequency ablation needle, comprising:

[0038] A two-way joint 1, comprising an inlet pipe mounting groove 11, an outlet pipe mounting groove 12, a return flow main channel 13, an inlet flow channel 14 and an outlet flow channel 15, wherein the inlet pipe 9 is fixedly mounted in the inlet pipe mounting groove 11, the outlet pipe 8 is fixedly mounted in the outlet pipe mounting groove 12, the inlet flow channel 14 and the outlet flow channel 15 are arranged on both sides of the return flow main channel 13, the diameter of the inlet flow channel 14 is smaller than the diameter of the outlet flow channel 15, and the outlet pipe mounting groove 12 is connected to the return flow main channel 13 through the outlet branch channel 121;

[0039] The needle body 2 includes an inner tube 21, an outer tube 22 and a needle tip 23. One end of the inner tube 21 passes through the water outlet channel 15 and is fixedly installed in the water inlet channel 14. The outer tube 22 is sleeved on the outside of the inner tube 21. One end of the outer tube 22 is fixedly installed in the water outlet channel 15. The needle tip 23 is fixedly installed on the outer tube 22. A notch 211 arranged along the axial direction is provided at the end of the inner tube 21, and the end face of the inner tube 21 contacts the back of the needle tip 23.

[0040] The volume of the two-way connector 1 is smaller, which reduces the overall volume of the circulation channel. The cross-sectional area of ​​the channel changes gradually without large mutations, and the number of bends is reduced to reduce the resistance to fluid flow. The notch 211 arranged along the axial direction at the end of the inner tube 21 makes it easier for the fluid to flow in a narrow area when the cooling liquid starts to flow back at the end of the inner tube 21, thereby improving the circulation efficiency and avoiding excessive impact caused by the change of the liquid from high speed to low speed, which causes the needle body to move. In actual clinical applications, it can reduce the ablation of unexpected soft tissues and improve the ablation efficiency of target tissues.

[0041] A blind hole 231 is provided on the back of the needle tip 23. The provision of the blind hole 231 allows the fluid to enter the interior of the needle tip 23, thereby increasing the contact area between the cooling liquid and the needle tip 23 and improving the heat exchange efficiency.

[0042] The ratio of the flow channel cross-sectional area of ​​the inner tube 21 to that of the outer tube 22 is 1:1 to 1:1.2, which avoids the needle body from moving due to a sudden change in the cross-sectional area and controls the stability of the fluid flow rate.

[0043] The inner tube 21 is a stainless steel tube or an organic polymer tube, and the organic polymer tube is specifically a polyimide (P1) tube.

[0044] The outer tube 22 is a stainless steel tube, and the surface of the outer tube 22 is also provided with an insulating coating, such as a Teflon coating.

[0045] The surface of the outer tube 22 is provided with arc grooves arranged in an array. The arc grooves on the surface of the outer tube 22 are grooves with arc-shaped cross sections. The arc grooves form an ultrasonic development structure, which improves the effect of reflecting ultrasonic waves and enhances the ultrasonic image recognition effect.

[0046] Working principle: The inner tube 21 and the outer tube 22 are fixed to the two-way joint 1 by adhesive bonding or insert injection molding, and combined with the water inlet pipe 9, the water outlet pipe 8 and the internal flow channel of the two-way joint 1, a fluid channel structure for liquid circulation is formed.

[0047] Please refer to the attached Figure 1-2 , the working principle of the circulation channel is as follows:

[0048] The cooling liquid enters the inner tube 21 of the needle body 2 through the water inlet pipe 9 and is transported along the inner tube 21 toward the needle tip 23;

[0049] When the cooling liquid is delivered to the end of the inner tube 21, on the one hand, it cools the needle tip 23, and on the other hand, it flows out of the inner tube 21 from the notch 211, enters the reflux gap between the inner tube 21 and the outer tube 22, and flows in the opposite direction toward the two-way joint 1 along the reflux gap, thereby realizing reflux:

[0050] After the reflux cooling liquid leaves the reflux gap, it enters the reflux main channel 13 perpendicular to the needle body 2, and enters the water outlet pipe 8 along the water outlet branch channel 121, thereby realizing liquid circulation.

[0051] Example 2

[0052] See also Figure 6 , the rest is the same as Example 1, the difference is that the two-way joint 1 includes a first shell 19 and a second shell 18, the second shell 18 is inserted into the installation groove 191 on the first shell 19, the water inlet pipe installation groove 11 is arranged on the second shell 18, and the water outlet channel 15 is arranged on the first shell 19.

[0053] The bidirectional joint structure can be in the form of an integral single structural member or a combination of multiple structural members.

[0054] Specifically, the bidirectional joint 1 can be formed by combining an independent first shell 19 and an independent second shell 18. After the two are spliced, they can be fixed by ultrasonic welding, glue bonding, sealing ring interference assembly, etc. After the second shell 18 is installed in the installation groove 191, the gap between the first shell 19 and the second shell 18 forms a return main channel 13.

[0055] The combined bidirectional joint 1 makes the volume of the circulation channel smaller, reduces the curved part of the channel, reduces the fluid resistance of the system, simplifies the assembly of the water inlet and outlet channels, prevents the water inlet and outlet channels from being blocked due to glue overflow during the installation of the needle body 2, and improves the sealing and pressure resistance of the channel.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A circulating cooling structure for a radiofrequency ablation needle, characterized in that: include: A two-way joint, comprising an inlet pipe mounting groove, an outlet pipe mounting groove, a return flow main channel, an inlet flow channel and an outlet flow channel, wherein the inlet pipe is fixedly mounted in the inlet pipe mounting groove, the outlet pipe is fixedly mounted in the outlet pipe mounting groove, the inlet flow channel and the outlet flow channel are arranged on both sides of the return flow main channel, the diameter of the inlet flow channel is smaller than the diameter of the outlet flow channel, and the outlet pipe mounting groove is connected to the return flow main channel through an outlet branch flow channel; The needle body comprises an inner tube, an outer tube and a needle tip. One end of the inner tube passes through the water outlet channel and is fixedly installed in the water inlet channel. The outer tube is sleeved outside the inner tube. One end of the outer tube is fixedly installed in the water outlet channel. The needle tip is fixedly installed on the outer tube. A notch arranged along the axial direction is provided at the end of the inner tube, and the end face of the inner tube contacts the back of the needle tip.

2. The circulating cooling structure of a radiofrequency ablation needle according to claim 1, characterized in that: The two-way joint includes a first shell and a second shell. The second shell is inserted into a mounting groove on the first shell. The water inlet pipe mounting groove is arranged on the second shell. The water outlet channel is arranged on the first shell.

3. A circulating cooling structure for a radiofrequency ablation needle according to claim 1 or 2, characterized in that: A blind hole is arranged on the back side of the needle tip.

4. A circulating cooling structure for a radiofrequency ablation needle according to claim 1 or 2, characterized in that: The ratio of the flow channel cross-sectional area of ​​the inner tube to that of the outer tube is 1:1 to 1:1.

2.

5. A circulating cooling structure for a radiofrequency ablation needle according to claim 1 or 2, characterized in that: The inner tube is a stainless steel tube or an organic polymer tube.

6. A circulating cooling structure for a radiofrequency ablation needle according to claim 1 or 2, characterized in that: The outer tube is a stainless steel tube.

7. A circulating cooling structure for a radiofrequency ablation needle according to claim 1 or 2, characterized in that: The surface of the outer tube is provided with arc-shaped grooves arranged in an array.

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