Double-waterway cooling radiofrequency ablation electrode
By integrating a dual-channel water-based radiofrequency ablation electrode with a perfusion and cold circulation system, the problems of high temperature and uneven impedance of radiofrequency ablation electrodes were solved, achieving effective tissue ablation.
Patent Information
- Application Number
- CN202422951907.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The existing perfusion system of radiofrequency ablation electrodes cannot be effectively cooled, resulting in high working temperature, which easily leads to tissue carbonization and uneven impedance, affecting the ablation effect.
A dual-water-cooled radiofrequency ablation electrode is designed, integrating a perfusion system and a cold circulation system. Physiological saline is injected through a capillary tube to reduce impedance, and cold circulation fluid is injected through the inner needle tube to cool the outer needle tube, ensuring that the electrode temperature is reduced and preventing carbonization.
It effectively prevents tissue carbonization, ensures a uniform distribution of the low-resistance environment on the outside of the electrode, and improves the ablation effect.
Smart Images
Figure CN223653919U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, especially a double waterway cooling radio frequency ablation electrode. BACKGROUND
[0002] Radio frequency ablation electrode adopts radio frequency ablation principle, passes through ablation electrode and transmits the radio frequency energy of emission to the treatment area, and radio frequency energy transforms into heat energy after high frequency oscillation in tissue, makes the lesion tissue of treatment area to take place coagulation necrosis. Because the treatment area of operation is not always in low impedance high conductivity environment, such as when carrying out treatment to lung tissue, the lung tissue is mostly alveolus, and the working impedance is high, in order to guarantee the treatment effect, need to improve output voltage, like this, local tissue carbonization is extremely easy to appear, in order to avoid the appearance of above-mentioned situation, usually injects physiological saline into the treatment area along ablation electrode when ablation, and physiological saline forms high temperature vapor under the action of high temperature, and then diffuses to the vicinity of lesion tissue, reduces the impedance of lesion tissue.
[0003] However, the conventional perfusion type radio frequency ablation electrode only has a perfusion system, and cannot effectively cool the working section of the electrode, resulting in high temperature of the working section and easy occurrence of tissue carbonization. The carbonized tissue blocks some perfusion holes located on the electrode pipe wall. The blocked perfusion holes have no physiological saline flowing out, which further aggravates the carbonization degree of the region. The unblocked perfusion holes have increased flow, which causes uneven distribution of low impedance environment of the entire treatment region and affects the ablation effect. UTILITARY MODEL CONTENT
[0004] To solve the above-mentioned deficiencies of the prior art, the utility model provides a double waterway cooling radio frequency ablation electrode, which integrates the perfusion system and the cold circulation system in one electrode, ensures that the working section of the electrode has a low impedance environment while effectively cooling the perfusion area, and thus guarantees the ablation effect.
[0005] The utility model discloses a technical scheme for a double-waterway cooling radio frequency ablation electrode, which comprises a handle, an outer needle tube fixed on the handle, a needle head fixed at the distal end of the outer needle tube, and a radio frequency connector electrically connected to the proximal end of the outer needle tube. A plurality of perfusion holes are formed in the outer wall of the outer needle tube close to the needle head. An inner needle tube is arranged through the inner space of the outer needle tube. A cooling channel is formed between the outer needle tube and the inner needle tube, which is in communication with the inner space of the inner needle tube. A capillary tube corresponding to each perfusion hole is arranged in the cooling channel. The distal end of the capillary tube is sealingly connected to the perfusion hole. The proximal end of the capillary tube extends into the handle and is connected to a water injection pipeline. By arranging the inner needle tube and the capillary tube corresponding to each perfusion hole in the outer needle tube, physiological saline is injected through the capillary tube to reduce the impedance between the outer side of the electrode and the lesion tissue. Cold circulating liquid is injected through the inner needle tube to cool the outer needle tube. Thus, the perfusion system and the cold circulating system are integrated in one electrode, which can reduce the temperature of the electrode during radio frequency ablation, prevent carbonization, reduce the impedance, and improve the ablation effect.
[0006] The perfusion holes are divided into a plurality of perfusion hole groups arranged at intervals in a direction away from the needle head. The perfusion holes between each perfusion hole group are distributed in a staggered manner. By arranging the perfusion holes in a staggered manner on the outer needle tube, the capillary tubes connected to the perfusion holes are distributed between the inner needle tube and the outer needle tube in a non-overlapping manner, thereby ensuring that the outer needle tube has a minimum size and contains a sufficient number of capillary tubes.
[0007] The end of the perfusion hole away from the capillary tube has an arc-shaped chamfered edge. The arc-shaped chamfered edge design can avoid the edge effect of the conductor in the edge region during radio frequency treatment due to rough machining of the perfusion hole opening, thereby inducing high-temperature carbonization.
[0008] The end of the needle head connected to the outer needle tube has a cooling groove in communication with the cooling channel. The cooling groove allows the cold circulating liquid to enter the needle head to effectively cool the needle head part and avoid high-temperature adhesion of the needle head.
[0009] The handle has a cold circulating member fixed inside. The cold circulating member is connected to a water inlet pipe and a water return pipe. The part of the inner needle tube protruding from the outer needle tube is in communication with the water inlet pipe through the cold circulating member. The cooling channel is in communication with the water return pipe through the cold circulating member.
[0010] The cold circulating member is a circulating tank. The circulating tank is divided into a water return cavity in communication with the water return pipe and a water inlet cavity in communication with the water inlet pipe through a partition plate in a direction away from the outer needle tube. The proximal end of the outer needle tube is in communication with the water return cavity through one side of the cold circulating tank. The proximal end of the inner needle tube is in communication with the water inlet cavity through the partition plate. The proximal end of each capillary tube extends along the outer wall of the inner needle tube into the water inlet cavity and then passes out from the other side of the circulating tank.
[0011] A temperature measuring thermocouple is fixed in the needle head. The thermocouple wire of the temperature measuring thermocouple extends along the inner needle tube into the handle and is electrically connected to the radio frequency connector.
[0012] The outer needle tube is coated with an insulating layer, one end of the insulating layer extends to a position outside the handle connection of the outer needle tube, and the other end of the insulating layer extends to a position outside the nearest perfusion hole.
[0013] The beneficial effects of the utility model are as follows: the inner needle tube and the capillary corresponding to the perfusion hole are arranged in the outer needle tube, physiological saline is injected through the capillary to reduce the impedance between the outside of the electrode and the lesion tissue, and the cold circulating liquid is injected through the inner needle tube to cool the outer needle tube, so that the perfusion system and the cold circulating system are integrated in one electrode, the temperature of the electrode can be reduced during radiofrequency ablation, the tissue carbonization is prevented, and the situation that the carbonized tissue blocks the perfusion hole is avoided, the physiological saline flows out from each perfusion hole, the uniform distribution of the low impedance environment outside the electrode is ensured, and the ablation effect is effectively improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a structural schematic view of the utility model;
[0015] Figure 2 It is a sectional view of the handle in the utility model;
[0016] Figure 3 It is a sectional view of the needle tip and the outer needle tube connection part in the utility model;
[0017] Figure 4 It is a transparent view of the needle tip and the outer needle tube connection part in the utility model;
[0018] Figure 5 It is a cross-sectional view of the outer needle tube in the utility model;
[0019] Figure 6 It is a structural schematic view of the circulating tank in the utility model.
[0020] Reference signs: 1, handle; 2, outer needle tube; 201, perfusion hole; 202, cooling channel; 3, needle head; 301, cooling groove; 4, radiofrequency connector; 5, inner needle tube; 6, capillary; 7, water injection pipeline; 8, circulating tank; 801, partition; 802, water feeding cavity; 803, water returning cavity; 804, water feeding seat; 805, water returning seat; 806, through hole; 9, water feeding pipe; 10, water returning pipe; 11, temperature measuring thermocouple; 1101, thermocouple wire; 12, insulating layer; 13, indicator lamp; 14, annular magnet; 15, magnetic induction coil. DETAILED DESCRIPTION
[0021] In order for the person skilled in the art to better understand the technical solutions in the present application, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings, and other embodiments obtained by the person skilled in the art without creative labor shall all belong to the protection scope of the present application.
[0022] As shown in Figure 1 and Figure 3 The utility model provides a kind of double waterway cooling radio frequency ablation electrode, including handle 1, fixed on handle 1 outer needle tube 2, needle head 3 being fixed in the distal end of outer needle tube 2 and with the radio frequency connector 4 of outer needle tube 2 proximal end electrical connection, the outer wall of outer needle tube 2 is close to needle head 3 and is equipped with multiple perfusion holes 201, inner needle tube 5 is arranged in the inside of outer needle tube 2, and cooling channel 202 being communicated with the inside of inner needle tube 5 is formed between outer needle tube 2 and inner needle tube 5, and cooling channel 202 is arranged with the capillary tube 6 corresponding to perfusion hole 201 one to one, the distal end of capillary tube 6 is sealedly connected with perfusion hole 201, and the proximal end of capillary tube 6 extends to handle 1 and is connected with water injection pipeline 7. Preferably, in the embodiment, perfusion hole 201 is 9, to avoid the superposition of capillary tube 6 connected with each perfusion hole 201 between inner needle tube 5 and outer needle tube 2, the perfusion hole 201 is divided into multiple perfusion hole 201 groups being arranged in the direction away from needle head 3, i.e. three perfusion hole 201 groups, as shown in Figure 5 The angle between the centers of adjacent perfusion holes 201 in each perfusion hole 201 group is 120 degrees, and the perfusion holes 201 between each perfusion hole 201 group are staggered distributed, so that the corresponding nine capillary tubes 6 are evenly distributed between the inner needle tube 5 and the outer needle tube 2 in the circumferential direction, and the angle between the centers of each adjacent capillary tube 6 is 40°, thereby ensuring that the minimum size of the outer needle tube 2 contains a sufficient number of capillary tubes 6.
[0023] The ablation electrode injects physiological saline through the capillary tubes 6 to reduce the impedance between the outside of the electrode and the lesion tissue, injects cold circulating liquid through the inner needle tube 5 to cool the outer needle tube 2, thereby integrating the perfusion system and the cold circulation system in one electrode, ensuring that the electrode temperature can be reduced during radio frequency ablation to prevent tissue carbonization, thereby avoiding the situation that carbonized tissue blocks the perfusion holes 201, and the physiological saline flows out of each perfusion hole 201 separately to ensure the uniform distribution of the low impedance environment on the outside of the electrode, effectively improving the ablation effect.
[0024] As shown in Figure 4 The end of the perfusion hole 201 away from the capillary tube 6 has an arc chamfered edge. By designing the opening edge of the perfusion hole 201 as an arc chamfer, the edge effect of the conductor in the edge region during radio frequency treatment caused by rough machining of the opening of the perfusion hole 201 can be avoided, thereby inducing high-temperature carbonization.
[0025] As shown in Figure 3 , the needle 3 has a cooling groove 301 connected with the cooling channel 202 at the end connected with the outer needle tube 2, and the cooling circulating liquid injected by the inner needle tube 5 flows through the cooling groove 301, thereby cooling the needle 3 part to avoid high temperature adhesion phenomenon at the needle 3 part.
[0026] As shown in Figure 1 , the outer needle tube 2 is coated with an insulating layer 12 to wrap the part of the outer needle tube 2 which does not need to release energy, specifically, one end of the insulating layer 12 extends to the connection between the outer needle tube 2 and the handle 1, and the other end of the insulating layer 12 extends to the outer side of the group of perfusion holes 201 closest to the handle 1.
[0027] Further preferably, a cold circulating member is fixed inside the handle 1, the cold circulating member is connected with the water inlet pipe 9 and the water return pipe 10, the part of the inner needle tube 5 extending out of the outer needle tube 2 is connected with the water inlet pipe 9 through the cold circulating member, and the cooling channel 202 is connected with the water return pipe 10 through the cold circulating member; as shown in Figure 2 , the cold circulating member in the embodiment is a circulating tank 8, the circulating tank 8 is divided into a water return cavity 803 connected with the water return pipe 10 and a water inlet cavity 802 connected with the water inlet pipe 9 along the direction away from the outer needle tube 2 through a partition plate, the proximal end of the outer needle tube 2 penetrates through one side of the cold circulating tank 8 and is connected with the water return cavity 803, the proximal end of the inner needle tube 5 penetrates through the partition plate and is connected with the water inlet cavity 802, and the proximal end of each capillary tube 6 extends along the outer wall of the inner needle tube 5 into the water inlet cavity 802 and then penetrates out of the other side of the circulating tank 8, as shown in Figure 6 , the side of the cold circulating tank 8 away from the outer needle tube 2 is formed with a water inlet seat 804, the water inlet pipe 9 is sealed and penetrates in the water inlet seat 804 to connect the water inlet cavity 802 inside the water inlet seat 804, the partition plate 801 is formed with a water return seat 805, the water return pipe 10 is sealed and penetrates in the water return seat 805 to connect the water return cavity 803 inside the partition plate 801, and the circulating tank 8 and the partition plate 801 are respectively provided with penetration openings 806 corresponding to the outer needle tube 2, the capillary tube 6 and the inner needle tube 5, and the outer needle tube 2, the inner needle tube 5 and the capillary tube 6 are sealed by sealing glue after penetrating through the corresponding penetration openings 806 to ensure the circulating effect of the cold circulating liquid in the cold circulating tank 8 and the cooling channel 202.
[0028] As shown in Figure 3 , in order to monitor the temperature at the needle 33 position, a temperature measuring thermocouple 11 is fixed in the needle 3, the thermocouple wire 1101 of the temperature measuring thermocouple 11 extends along the inner needle tube 5 into the handle 1 and is electrically connected with the radio frequency connector 4, specifically, as shown in Figure 2 , the thermocouple wire 1101 penetrates into the water inlet cavity 802 along the inner cavity of the inner needle tube 5 and is connected with the radio frequency connector 4 outside the handle 1 after penetrating out of the circulating tank 8 together with the capillary tube 6.
[0029] In order to facilitate the effective identification of the working state of the ablation electrode, the ablation electrode further comprises an indicator lamp 13 fixed on the handle 1 and a ring magnet 14 sleeved on the outer needle tube 2 located inside the handle 1, and the ring magnet 14 is connected with a magnetic induction coil 15 electrically connected with the indicator lamp 13. The outer needle tube 2 passes through the radio frequency current to generate a magnetic field around the outer needle tube 2, thereby changing the magnetic flux passing through the magnetic induction coil 15 to generate an induced current, and the indicator lamp 13 is lit to indicate that the ablation electrode is in the working state.
[0030] Using the ablation electrode for surgery, for example, lung surgery, the radio frequency connector 4 is connected with the main machine, the electrode is punctured into the treatment area, the outer needle tube 2 and the needle 3 outside the insulating layer 12 emit radio frequency energy, at the same time, the medical staff injects physiological saline into the water injection pipeline 7 through the syringe or peristaltic pump and the like, the physiological saline reaches the perfusion hole 201 along the capillary 6, the physiological saline forms high-temperature vapor under the action of high temperature, and the high-temperature vapor is uniformly diffused to the lesion tissue, at the same time, the cold circulating liquid is injected into the circulating tank 8 through the peristaltic pump and the like, and sequentially passes through the upper water cavity 802, the inner needle tube 5 and reaches the cooling channel 202, so as to cool the wall of the outer needle tube 2, especially the wall near the perfusion hole 201, to avoid the carbonization of the lesion tissue in the region, thereby ensuring the ablation effect of the ablation electrode.
[0031] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A dual-water-cooled radiofrequency ablation electrode, comprising a handle, an outer needle tube fixed to the handle, a needle tip fixed to the distal end of the outer needle tube, and a radiofrequency connector electrically connected to the proximal end of the outer needle tube, wherein the outer needle tube has multiple infusion holes on its outer wall near the needle tip, characterized in that, An inner needle tube is inserted through the outer needle tube, and a cooling channel is formed between the outer needle tube and the inner needle tube, which is connected to the inside of the inner needle tube. Capillary tubes corresponding to the injection holes are arranged in the cooling channel. The distal end of the capillary tube is sealed to the injection hole, and the proximal end of the capillary tube extends into the handle and is connected to the water injection pipeline.
2. The dual-water-cooled radiofrequency ablation electrode according to claim 1, characterized in that, The injection holes are divided into multiple injection hole groups arranged at intervals along the direction away from the needle tip, and the injection holes in each injection hole group are staggered.
3. A dual-water-cooled radiofrequency ablation electrode according to claim 1 or 2, characterized in that, The end of the injection hole away from the capillary tube has a curved chamfered edge.
4. A dual-water-cooled radiofrequency ablation electrode according to claim 1 or 2, characterized in that, The end of the needle connected to the outer needle tube has a cooling groove that communicates with the cooling channel.
5. A dual-water-cooled radiofrequency ablation electrode according to claim 1 or 2, characterized in that, A cooling circulation component is fixed inside the handle. The cooling circulation component is connected to an inlet water pipe and a return water pipe. The part of the inner needle tube that extends out of the outer needle tube is connected to the inlet water pipe through the cooling circulation component. The cooling channel is connected to the return water pipe through the cooling circulation component.
6. The dual-water-cooled radiofrequency ablation electrode according to claim 5, characterized in that, The cold circulation component is a circulation tank. The circulation tank is divided into a return water chamber connected to the return water pipe and an upper water chamber connected to the upper water pipe via a partition plate in the direction away from the outer needle tube. The proximal end of the outer needle tube penetrates one side of the cold circulation tank and communicates with the return water chamber. The proximal end of the inner needle tube penetrates the partition plate and communicates with the upper water chamber. The proximal ends of each capillary tube extend along the outer wall of the inner needle tube into the upper water chamber and then exit from the other side of the circulation tank.
7. The dual-water-cooled radiofrequency ablation electrode according to claim 4, characterized in that, A thermocouple is fixed inside the needle, and the thermocouple wire extends along the inner needle tube into the handle and is electrically connected to the radio frequency connector.
8. A dual-water-cooled radiofrequency ablation electrode according to claim 1 or 2, characterized in that, The outer side of the outer needle tube is coated with an insulating layer. One end of the insulating layer extends to the connection between the outer needle tube and the handle, and the other end extends to the outer side of the nearest infusion hole.