Ablation electrode with temperature prompting function

Abstract

The invention relates to an ablation electrode with a temperature prompt function, which comprises a handle, one end of the handle is provided with a plug, the other end of the handle is provided with a cutter bar, the front end of the cutter bar is provided with a loop electrode, an insulator and a working electrode, and the front end of the cutter bar is also provided with a temperature feedback mechanism. And the temperature feedback mechanism displays a visible signal at the front end of the cutter bar. According to the technical scheme, the temperature feedback mechanism is arranged at the front end of the cutter bar, and when the temperature exceeds the preset value, the temperature feedback mechanism displays a visual signal at the front end of the cutter bar, so that a doctor can visually receive a temperature prompt under an endoscope; therefore, the purpose of prompting the temperature of fluid or tissue around the ablation area of the ablation electrode is achieved, and thermal damage is reduced.

Description

Technical Field

[0001] The invention relates to an ablation electrode with a temperature prompting function, belonging to the field of plasma surgical equipment. Background Art

[0002] At present, plasma surgical equipment on the market relies on plasma generated in physiological saline to cut and ablate tissues. Because plasma has a relatively low temperature (around 40°C) during surgery and the recommended temperature during surgery is not more than 60°C, the degree of thermal damage is small and it is favored by doctors and patients. However, during surgery, due to the complexity of the surgical environment, local temperature rise is prone to occur when cutting or ablating tissues, which can easily cause additional thermal damage events.

[0003] For example, when the ablation electrode is ablated in the joint, if the temperature in the joint cavity exceeds 50 degrees, it may cause irreversible thermal damage to the articular cartilage cells due to high temperature, and destroy the extracellular matrix of the cartilage cells, which directly affects the repair ability of the articular cartilage after thermal damage and affects the normal physiological function of the joint cells. The prior art usually adds a temperature detection module near the ablation electrode, and adds a light display module on the handle to feedback temperature information to prompt the doctor. In the Chinese utility model patent with the authorization announcement number CN213310243U and the name "Plasma Knife Head", a plasma knife head is disclosed, including a knife head plug, a knife head handle and a knife head front end, the knife head plug is used to connect the plasma knife head with the energy supply end, and the knife head plug and / or the knife head handle are provided with a light display component. The front end of the knife head includes a temperature detection module; the temperature detection module is arranged on the outside of the front end of the knife head. When the knife head detects that the temperature of the physiological saline exceeds the expected value, the alarm sound of the device or the flashing alarm light is used to remind or force the doctor to take corresponding measures to control the temperature increase.

[0004] Although the plasma knife head of the above patent can detect the temperature of saline solution through the light display component, most plasma surgical electrodes are used under endoscopes. During the operation, the doctor stares at the front end of the ablation electrode under the endoscope on the screen, and sometimes it is difficult to notice the changes in the light on the handle or the alarm sound. Therefore, it is necessary to further improve the plasma knife head.

[0005] Based on the above issues, the applicant conducted research, which resulted in this case. Summary of the invention

[0006] The object of the present invention is to provide an ablation electrode which can better provide temperature feedback to remind the operator.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] An ablation electrode with a temperature prompt function comprises a handle, one end of the handle is provided with a plug, the other end is provided with a knife rod, the front end of the knife rod is provided with a loop electrode, an insulator and a working electrode, and the front end of the knife rod is also provided with a temperature feedback mechanism. When the temperature exceeds a preset value, the temperature feedback mechanism displays a visually visible signal at the front end of the knife rod.

[0009] As a preferred embodiment of the present invention, the temperature feedback mechanism includes a light guide block, an optical fiber and a temperature detection module connected to the host signal. The temperature detection module is arranged at the front end of the knife rod. A mounting hole is opened on the loop pole. The light guide block is embedded in the mounting hole. A mounting seat is provided in the light guide block. The optical fiber is inserted in the mounting seat. The optical fiber is located in the loop pole. One end of the optical fiber is arranged corresponding to the mounting seat, and the other end is arranged corresponding to the light source. The light source is electrically connected to the host.

[0010] As a preferred embodiment of the present invention, there are two mounting holes, and the two mounting holes are symmetrically arranged along the radial direction of the loop pole.

[0011] As a preferred embodiment of the present invention, the loop pole is covered with an insulating sleeve, and the temperature detection module is sandwiched between the insulating sleeve and the loop pole.

[0012] As a preferred embodiment of the present invention, the temperature detection module is a thermocouple or a thermistor.

[0013] As a preferred embodiment of the present invention, the diameter of the temperature detection module is 0.05-0.2 mm.

[0014] As a preferred embodiment of the present invention, the surface of the light guide block is flush with the surface of the loop electrode.

[0015] As another preferred embodiment of the present invention, the temperature feedback mechanism is a reversible thermochromic material layer coated on the front end of the loop electrode.

[0016] As a preferred embodiment of the present invention, the thermochromic material layer is coated with a transparent sleeve.

[0017] As a preferred embodiment of the present invention, the temperature-sensitive color-changing material layer is a thermochromic material.

[0018] By adopting the technical solution of the present invention, a temperature feedback mechanism is set at the front end of the knife rod. When the temperature exceeds the preset value, the temperature feedback mechanism displays a visually visible signal at the front end of the knife rod, so that the doctor can visually receive the temperature prompt under the endoscope, thereby achieving the purpose of prompting the temperature of the fluid or tissue around the ablation area of ​​the ablation electrode, and reducing thermal damage. In the first embodiment of the present invention, the temperature of the front end of the knife rod is detected by a temperature detection module. When the temperature exceeds the preset value, the temperature is transmitted to the host through the temperature detection module. The host controls the light source, and the light source transmits the light to the light guide block through the optical fiber. The doctor can intuitively see the light under the endoscope, thereby quickly obtaining the temperature of the fluid or tissue around the ablation area and performing corresponding operations. In another embodiment of the present invention, the temperature feedback mechanism uses a thermochromic material. When the temperature exceeds the preset value, the thermochromic material changes color. The doctor can intuitively see the color change under the endoscope, thereby causing an alert and performing corresponding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the local structure of the first embodiment of the present invention.

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0022] Figure 4 This is a schematic diagram of the structure of a combination of a light guide block and an optical fiber in the first embodiment of the present invention.

[0023] Figure 5 It is a schematic structural diagram of a second embodiment of the present invention.

[0024] Figure 6 It is a partial cross-sectional view of a second embodiment of the present invention.

[0025] In the figure:

[0026] Tool bar 1 Handle 2

[0027] Cable 3 Plug 4

[0028] Insulation sleeve 5 Light guide block 6

[0029] Optical fiber 7 Loop terminal 8

[0030] Ceramic 9 Working pole 10

[0031] Temperature measuring element 11 Temperature sensitive sticker 12

[0032] Transparent sleeve 13 Mounting seat 14 DETAILED DESCRIPTION

[0033] In order to better understand the technical solution of the present invention, it is described in more detail below in conjunction with embodiments.

[0034] Reference Figures 1 to 6 The ablation electrode of the present invention comprises a plug 4, a cable 3, a handle 2 and a knife rod 1. The plug 4 is connected to the handle 2 through the cable 3. The knife rod 1 is arranged at the front end of the handle 2. A temperature feedback mechanism is arranged at the front end of the knife rod 1. In the present invention, a return pole 8, an insulator and a working pole 10 are arranged at the front end of the knife rod 1. The insulator is made of ceramic 9.

[0035] The first implementation method of the temperature feedback mechanism is: Figure 2 He Ru Figure 3 , insert the optical fiber 7 into the light guide block 6 and fix it with glue or other reliable means. Specifically, a mounting seat 14 is provided on the light guide block 6, and the optical fiber 7 is inserted into the mounting seat 14 to form a combination of the optical fiber 7 and the light guide block 6 (such as Figure 4 As shown), a hole is opened on the 8 loop electrode, and the position of the hole is as close as possible to the front end of the knife rod 1. The assembly is installed into the loop electrode 8 and the light guide block 6 is allowed to enter the hole. The overlap surface is made on the light guide block 6 to cooperate with the hole of the loop electrode 8 to prevent the light guide block 6 from moving. Preferably, the outer surface of the light guide block 6 is flush with the outer surface of the loop electrode 8, so that when the ablation electrode is inserted into the endoscope, the insertion will not be poor due to the protruding surface of the light guide block 6, or the light guide block 6 will not be damaged by sharp objects on the endoscope, and the broken part will fall into the human body to produce serious consequences. The light guide block 6 is further fixed in the hole of the loop electrode 8 by glue or other reliable methods. Preferably, two holes are opened on the loop electrode 8, and a combination is placed in each. The positions of the two holes are as far as possible on the left and right sides of the loop electrode 8, so that the light guide block 6 can be seen regardless of whether it is the left or right side of the knife rod 1 of the ablation electrode in the endoscope lens. Other structural methods can be to combine two light guide blocks 6 into a large light guide block, as long as it can be ensured that the light guide block 6 can be seen from all angles.

[0036] like Figure 2 and Figure 3A temperature detection module is provided in the insulating sleeve 5. The specific temperature detection module is a temperature measuring element. The size of the temperature measuring element 11 needs to be very small to ensure that after it is placed, the surrounding of the insulating sleeve 5 can still be close to the loop pole 8, and can still be smoothly inserted into the endoscope. The temperature measuring element 11 can be clamped between the two by bonding or heat shrinking the insulating sleeve 5 to the loop pole 8. The diameter of the temperature measuring element 11 is preferably 0.05-0.2mm, and the head end of the temperature measuring element 11 is as close to the front end of the knife rod 1 as possible, and its head end can be used for temperature measurement, so that the measured value is closer to the true value of the front end temperature. The temperature in that area is the temperature during ablation. If it is far away from the front end of the knife rod 1, the temperature may drop rapidly and cannot accurately indicate the temperature during ablation, thus losing the meaning of temperature feedback prompts. The temperature measuring element can use a thermocouple or a thermistor.

[0037] The temperature feedback prompt principle of this embodiment is as follows: the optical fiber 7 and the temperature measuring element 11 need to be connected to the handle 2. The head end of the temperature measuring element 11 measures the temperature of the front end of the knife rod 1. For example, the thermocouple converts the temperature signal into the difference of electromotive force. Its tail end is electrically connected to the cable 3 in the handle 2. The cable 3 is connected to the host (not shown in the figure) through the plug 4. They feed back the electromotive force difference of the thermocouple to the host. The host processes the signal and then feeds it back to the cable 3. The tail end face of the optical fiber 7 faces the light source in the handle 2. The light source is, for example, an LED lamp. The light in the light source is concentrated as much as possible in the optical fiber area. Since the light is transmitted along the axial direction of the optical fiber, the light transmission in other directions is almost zero. Therefore, the tail end face of the optical fiber 7 should be as perpendicular to the light of the light source as possible, so as to ensure the maximum transmission of the light in the optical fiber. The light source is electrically connected to the cable 3, and the information fed back from the host is fed back to the light source through the cable 3. The light source feeds back according to the information set in the host. For example, if the temperature exceeds 50°C, the light source is lit, and if it is lower than 50°C, the light source is extinguished. The light transmitted from the optical fiber 7 will be transmitted to the light guide block 6, which is made of transparent materials such as glass, quartz, PMMA and PC. Preferably, a reflective layer is attached or plated at the corresponding position of the light guide block 6 to refract or reflect the light as much as possible to the surface of the light guide block 6. In this way, the doctor can observe visual changes such as the light on and off or the change of light color on the surface of the light guide block 6 through the endoscope lens, which can visually prompt the ablation electrode to be overheated, achieving the purpose of temperature feedback prompt. Then the doctor can cool the temperature by stopping the excitation or increasing the liquid flow rate.

[0038] Figure 5 and Figure 6 1 is a schematic diagram of the structure of an ablation electrode according to a second embodiment of the present invention. The ablation electrode comprises a plug 4, a cable 3, a handle 2 and a knife rod 1.

[0039] Specifically, the temperature feedback mechanism includes a temperature-sensitive sticker 12, a transparent sleeve 13 is sleeved on the outside of the temperature-sensitive sticker 12, the temperature-sensitive sticker 12 is pasted around the loop electrode 8 in a complete circle, the temperature-sensitive sticker 12 has glue on the side close to the loop electrode 8, and can be tightly attached to the outside of the loop electrode 8, the transparent sleeve 7 can be heat-shrinkable at high temperature, and can be tightened to the outside of the temperature-sensitive sticker 12 after heating, or transparent glue or other reliable connection methods can be applied between the transparent sleeve 7 and the temperature-sensitive sticker 12.

[0040] The thermochromic sticker 12 contains reversible thermochromic materials, which can be purchased directly from the market. For example, the color change temperature of the thermochromic material is 50°C, and it is displayed as colorless below 50°C and red above 50°C. When the doctor sees the color prompt, he stops the stimulation of the ablation electrode, and when the temperature drops below 50°C, the color of the thermochromic sticker 12 can be restored to colorless. The thermochromic material can be transferred to the base material of the thermochromic sticker 12 using thermosensitive color-changing ink. The second embodiment of the present invention is to directly attach the thermochromic sticker 12 and protect it with a transparent sleeve 13, which has a simple structure, low cost, and is easy to process and manufacture.

[0041] The present invention adds a temperature feedback mechanism to the tip of the blade, allowing the doctor to visually receive temperature prompts under the endoscope, thereby achieving the purpose of prompting abnormal fluid or tissue temperature around the ablation area of ​​the ablation electrode and reducing thermal damage.

[0042] The protection scope of the present invention is not limited to this embodiment, and any person making similar changes thereto shall be deemed to be within the protection scope of the present invention.

Claims

1. An ablation electrode with a temperature prompt function, comprising a handle, one end of the handle is provided with a plug, the other end is provided with a knife rod, the front end of the knife rod is provided with a return electrode, an insulator and a working electrode, characterized in that: The front end of the knife rod is also provided with a temperature feedback mechanism. When the temperature exceeds a preset value, the temperature feedback mechanism displays a visually visible signal at the front end of the knife rod.

2. The ablation electrode with temperature prompting function according to claim 1, characterized in that: The temperature feedback mechanism includes a light guide block, an optical fiber and a temperature detection module connected to the host signal. The temperature detection module is arranged at the front end of the knife rod. A mounting hole is opened on the loop pole. The light guide block is embedded in the mounting hole. A mounting seat is provided in the light guide block. The optical fiber is inserted in the mounting seat. The optical fiber is located in the loop pole. One end of the optical fiber is arranged corresponding to the mounting seat, and the other end is arranged corresponding to the light source. The light source is electrically connected to the host.

3. The ablation electrode with temperature prompting function as claimed in claim 2, characterized in that: There are two mounting holes, and the two mounting holes are symmetrically arranged along the radial direction of the loop pole.

4. The ablation electrode with temperature prompting function as claimed in claim 3, characterized in that: The loop pole is covered with an insulating sleeve, and the temperature detection module is sandwiched between the insulating sleeve and the loop pole.

5. The ablation electrode with temperature prompting function as claimed in claim 4, characterized in that: The temperature detection module is a thermocouple or a thermistor.

6. The ablation electrode with temperature prompting function according to claim 5, characterized in that: The diameter of the temperature detection module is 0.05-0.2 mm.

7. The ablation electrode with temperature prompting function according to claim 6, characterized in that: The surface of the light guide block is flush with the surface of the loop electrode.

8. The ablation electrode with temperature prompting function according to claim 1, characterized in that: The temperature feedback mechanism is a reversible temperature-sensitive color-changing material layer coated on the front end of the loop electrode.

9. The ablation electrode with temperature prompting function according to claim 8, characterized in that: The thermochromic material layer is coated with a transparent sleeve.

10. The ablation electrode with temperature prompting function according to claim 9, characterized in that: The temperature-sensitive color-changing material layer is a thermochromic material.

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