Tumor ablation needle for nanometer knife
By simultaneously setting positive and negative electrodes on the tumor ablation needle for nanoknife, the operation difficulty of inserting two ablation needles at the same time in the prior art was solved, and a single needle was used to complete the tumor ablation operation, shortening the surgical time and improving the quality of the operation.
Patent Information
- Application Number
- CN202320154244.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-08
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2033-02-08
AI Technical Summary
The existing nanoknife ablation needles require two ablation needles to be inserted simultaneously as the positive and negative electrodes, which leads to increased operational difficulty and prolonged operation time, especially when treating tumors with diameters less than 15 mm.
A tumor ablation needle for nanoknife is designed, and electrically conducting the electrode is achieved by providing two electrodes on one needle, including a puncture needle, a positive electrode conductor and a negative electrode conductor.
Complete tumor ablation surgery through a single needle significantly reduces the difficulty of surgical operations, shortens the operation time, and improves the quality of surgery.
Smart Images
Figure CN222676424U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a medical device, in particular to a nano knife ablation needle suitable for tumor treatment, specifically a nano knife tumor ablation needle. Background Art
[0002] Nanoknife tumor ablation is a new tumor ablation technology. It releases high-voltage pulses to tumor cells through ablation, causing irreversible electroporation of the cell membrane at the nanoscale, destroying the intracellular balance and leading to cell apoptosis. After tumor cell apoptosis, phagocytes in the body devour the cell fragments, and the treated area is gradually replaced by normal tissue.
[0003] Existing nanoknife ablation needles are usually medical stainless steel round tubes, and an insulating sleeve is put on the round steel tube, so that the front end of the round steel tube is exposed more than 15 mm from the insulating sleeve. The exposed part is used as the discharge electrode of the ablation needle, and its head is sharp and can be used for percutaneous puncture.
[0004] During the Nanoknife ablation surgery, two ablation needles need to be inserted at the same time, one as the positive electrode and the other as the negative electrode, so that a pulse voltage can be input between the two electrodes to discharge and ablate the tumor tissue between the two discharge electrodes. In order to ensure the normal discharge, the two ablation needles are often required to be parallel to each other, which increases the difficulty of operation and prolongs the operation time, which is not conducive to the smooth progress of the operation. Especially for tumors with a diameter of less than 15 mm, the operation is more difficult. Utility Model Content
[0005] The purpose of the utility model is to provide a tumor ablation needle for a nanoknife in view of the deficiencies of the prior art, which can simultaneously set two electrodes on one needle, effectively solving the problems existing in the prior art, shortening the operation time, reducing the difficulty of operation for doctors, and ensuring the smooth progress of the operation.
[0006] The technical solution of the utility model is:
[0007] A tumor ablation needle for a nano knife, comprising a needle body and a handle, wherein the needle body comprises a puncture needle head, a positive conductor and a negative conductor;
[0008] The puncture needle is made of insulating material; the positive conductor and the negative conductor are both made of conductive material; the handle is in the shape of a hollow box;
[0009] The puncture needle is cylindrical, with a closed pointed front end and an open rear end, and a small hole penetrating radially in the middle thereof; the outer periphery and inner wall of the middle portion of the puncture needle are coated with a conductive coating I and a conductive coating II respectively; the inner wall of the small hole is coated with a conductive coating III; the conductive coating III is connected to the conductive coating I and the conductive coating II respectively;
[0010] The positive electrode conductor is cylindrical, and its outer circumference is wrapped with a positive electrode insulating sleeve except for the two ends; the negative electrode conductor is cylindrical with open ends, and its outer circumference is wrapped with a negative electrode insulating sleeve except for the two ends;
[0011] The front end of the negative conductor is connected to the rear end of the puncture needle, so that the inner holes of the two cooperate to form a built-in cavity; the rear end of the negative conductor is placed in the handle and is electrically connected to the negative wire; the positive conductor is placed in the built-in cavity, its front end is connected to the puncture needle and is tightly fitted with the conductive coating II, and its rear end extends from the rear end of the negative conductor and is electrically connected to the positive wire.
[0012] Furthermore, the puncture needle is made of zirconium oxide ceramics.
[0013] Furthermore, the conductive coating I, conductive coating II and conductive coating III are all metal coatings.
[0014] Furthermore, the positive electrode insulating sleeve and the negative electrode insulating sleeve are both made of polyimide polymer material.
[0015] Furthermore, the rear end of the puncture needle and the front end of the negative electrode conductor are respectively provided with corresponding step structures, so that the two can be spliced with each other without height difference at the splicing point.
[0016] Furthermore, the distance between the rear end edge of the conductive coating 1 and the front end edge of the negative electrode conductor is 2-8 mm.
[0017] Furthermore, a sunken groove is provided on the negative conductor where the negative insulating sleeve is located; the depth of the groove is adapted to the thickness of the negative insulating sleeve, so that the negative insulating sleeve is flush with the negative conductor.
[0018] Furthermore, it also includes a positive electrode terminal and a negative electrode terminal, which are respectively placed in the inner cavity of the handle; the positive electrode terminal is electrically connected to the rear end of the positive conductor and one end of the positive wire, respectively; the negative electrode terminal is electrically connected to the negative conductor and one end of the negative wire, respectively; the other end of the positive wire and the other end of the negative wire extend out of the handle, respectively.
[0019] Furthermore, the positive electrode wire and the negative electrode wire are both silicone wires.
[0020] Beneficial effects of the utility model:
[0021] The utility model has reasonable design, simple structure and is easy to use. By simultaneously arranging positive and negative electrodes on the needle body of the ablation needle, nanoknife tumor ablation surgery can be completed with a single needle, which greatly reduces the difficulty of surgical operation, shortens the operation time, and creates favorable conditions for improving the quality of surgery. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the structure of the utility model.
[0023] Figure 2 yes Figure 1 Enlarged cross-sectional view at point A in the middle.
[0024] Figure 3 yes Figure 2 Enlarged cross-sectional view at point C in the middle.
[0025] Figure 4 yes Figure 2 Enlarged cross-sectional view at point D in the middle.
[0026] Figure 5 yes Figure 1 Enlarged cross-sectional view at point B.
[0027] Figure 6 yes Figure 5 Enlarged cross-sectional view at point E in the middle.
[0028] Among them: 1-needle body; 2-handle; 3-silicone wire; 4-puncture needle; 5-positive conductor; 6-positive insulating sleeve; 7-negative conductor; 8-negative insulating sleeve; 9-conductive coating I; 10-conductive coating II; 11-conductive coating III; 12-shell; 13-negative electrode terminal; 14-negative wire; 15-positive wire; 16-back cover; 17-positive electrode terminal. DETAILED DESCRIPTION
[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0030] like Figure 1 As shown, a tumor ablation needle for nano knife includes a needle body 1 and a handle 2.
[0031] like Figure 2 As shown, the needle body 1 includes a puncture needle 4, a positive conductor 5 and a negative conductor 7. The puncture needle 4 is made of insulating materials such as medical zirconium oxide ceramics. The positive conductor 5 and the negative conductor 7 can both be made of conductive materials such as stainless steel.
[0032] like Figure 5 As shown, the handle 2 is in a hollow box shape, comprising a housing 12 and a rear cover 16. The rear cover 16 is detachable and can be fixed with medical glue, which is convenient for installation and maintenance.
[0033] like Figure 3 As shown, the puncture needle 4 is cylindrical, with a closed pointed front end and an open rear end, and a small hole is provided in the middle thereof which penetrates the side wall in a radial direction. Conductive coating I9 and conductive coating II10 are coated on the outer periphery and inner wall of the middle part of the puncture needle 4, respectively. Conductive coating III11 is coated on the inner wall of the small hole. The positions of the conductive coating I9 and the conductive coating II10 correspond to each other, and are respectively connected to the conductive coating III, so that electrical conduction is achieved between the conductive coating I9 and the conductive coating II10. Preferably, the conductive coating I9, the conductive coating II10 and the conductive coating III11 are all metal coatings, and materials such as 95 silver can be used, and the thickness is about 0.1 mm to ensure good conductivity. The lengths of the conductive coating I and the conductive coating II are both about 4 mm, which is convenient to use.
[0034] like Figure 2 , 4 As shown in Figure 5, the positive electrode conductor 5 is cylindrical, and its outer circumference is wrapped with a positive electrode insulating sleeve 6 except for the two ends, so that the surfaces of its two ends are conductive, and the appearance of other parts is in an insulating state. The negative electrode conductor 7 is cylindrical with open ends, and its outer circumference is wrapped with a negative electrode insulating sleeve 8 except for the two ends, so that the surfaces of its two ends are conductive, and the appearance of other parts is in an insulating state. Preferably, the positive electrode insulating sleeve 6 and the negative electrode insulating sleeve 8 can both be made of polyimide polymer material, so that they have good insulation properties. At the same time, a sunken groove is provided on the negative electrode conductor 7 where the negative electrode insulating sleeve 8 is located. The depth of the groove is adapted to the thickness of the negative electrode insulating sleeve 8, so that the negative electrode insulating sleeve 8 is flush with the negative electrode conductor 7, ensuring the smoothness of the needle body.
[0035] like Figure 2 and 4 As shown, the front end of the negative conductor 7 is connected to the rear end of the puncture needle 4, so that the inner holes of the two cooperate to form a built-in cavity. Preferably, the rear end of the puncture needle 4 and the front end of the negative conductor 7 are respectively provided with corresponding step structures, so that the two can be spliced with each other, and there is no height difference at the splicing point, so that the outer surface of the needle body 1 is smooth and flat, reducing the puncture resistance. The puncture needle 4 and the negative conductor 7 can be connected by gluing to ensure a firm connection.
[0036] like Figure 5 As shown, the rear end of the negative conductor 7 is placed in the handle 2, and is connected to the negative lead 14 through the negative electrode terminal 13. The negative lead 14 is then connected to an external power source, so that the front end of the negative conductor becomes the negative electrode for generating electricity for the ablation needle. Preferably, the negative electrode terminal 13 is connected to the negative conductor 7 by riveting, and is connected to the negative lead 14 by welding to ensure reliable connection.
[0037] like Figure 3 As shown, the positive conductor 5 is placed in the built-in cavity, and the outer diameter of its front end is adapted to the inner diameter of the front part of the puncture needle 4, so that it can be snapped into the puncture needle 4 and fit tightly with the conductive coating II10, so that the positive conductor 5 is electrically connected to the conductive coating II10, and then the positive conductor is electrically connected to the conductive coating I. Preferably, the positive conductor 5 can be connected to the puncture needle 4 by gluing to ensure a firm connection.
[0038] like Figure 5 and 6 As shown, the rear end of the positive conductor 5 extends from the rear end of the negative conductor 7 and is connected to the positive wire 15 through the positive electrode terminal 17. The positive wire 15 is then connected to an external power source, so that the conductive coating 1 forms the positive electrode for generating electricity for the ablation needle. Preferably, the positive electrode terminal 17 is connected to the positive conductor 5 by riveting, and is connected to the positive wire 15 by welding to ensure reliable connection.
[0039] The positive electrode terminal 17 and the negative electrode terminal 13 are respectively arranged in the handle 2, so that the connection is safe and reliable.
[0040] like Figure 2 As shown, the discharge distance is between the rear edge of the conductive coating 19 and the front edge of the negative conductor 7. The discharge distance is 2-8 mm to ensure normal discharge. At the same time, the discharge distance can be adjusted according to the size of the ablated tissue to ensure the treatment effect and efficiency. In specific implementation, a series of products including different discharge distances can be made to meet surgical needs.
[0041] The positive electrode wire 15 and the negative electrode wire 14 are both silicone wires 3, which are safe and durable. Figure 1 As shown, the silicone wire 3 extends from the rear end of the handle 2 and is connected to an external power source to supply power to the ablation needle.
[0042] The utility model provides positive and negative electrodes on the needle body of the ablation needle at the same time, so that tumor ablation surgery can be completed with a single needle, which greatly reduces the difficulty of surgical operation, shortens the operation time, and creates favorable conditions for improving the quality of surgery. At the same time, the needle body of the utility model has no steps, which effectively reduces the puncture resistance. Moreover, the puncture needle head adopts medical zirconium oxide ceramics, so that its tip is sharp and smooth, which reduces the difficulty of puncture, avoids the deviation of the target tissue caused by excessive puncture resistance in the past, and improves the practicality of the product.
[0043] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.
Claims
1. A tumor ablation needle for a nanoknife, comprising a needle body and a handle, characterized in that: The needle body comprises a puncture needle, a positive conductor and a negative conductor; The puncture needle is made of insulating material; the positive conductor and the negative conductor are both made of conductive material; the handle is in the shape of a hollow box; The puncture needle is cylindrical, with a closed pointed front end and an open rear end, and a small hole penetrating radially in the middle thereof; the outer periphery and inner wall of the middle portion of the puncture needle are coated with a conductive coating I and a conductive coating II respectively; the inner wall of the small hole is coated with a conductive coating III; the conductive coating III is connected to the conductive coating I and the conductive coating II respectively; The positive electrode conductor is cylindrical, and its outer circumference is wrapped with a positive electrode insulating sleeve except for the two ends; the negative electrode conductor is cylindrical with open ends, and its outer circumference is wrapped with a negative electrode insulating sleeve except for the two ends; The front end of the negative conductor is connected to the rear end of the puncture needle, so that the inner holes of the two cooperate to form a built-in cavity; the rear end of the negative conductor is placed in the handle and is electrically connected to the negative wire; the positive conductor is placed in the built-in cavity, its front end is connected to the puncture needle and fits tightly with the conductive coating II, and its rear end extends from the rear end of the negative conductor and is electrically connected to the positive wire.
2. The tumor ablation needle for nanoknife according to claim 1 is characterized in that: The puncture needle is made of zirconium oxide ceramics.
3. The tumor ablation needle for nanoknife according to claim 1 is characterized in that: The conductive coating I, conductive coating II and conductive coating III are all metal coatings.
4. The tumor ablation needle for nanoknife according to claim 1, characterized in that: The positive electrode insulating sleeve and the negative electrode insulating sleeve are both made of polyimide polymer material.
5. The tumor ablation needle for nanoknife according to claim 1, characterized in that: The rear end of the puncture needle and the front end of the negative electrode conductor are respectively provided with corresponding step structures, so that the two can be spliced with each other without height difference at the splicing point.
6. The tumor ablation needle for nanoknife according to claim 1, characterized in that: The distance between the rear end edge of the conductive coating 1 and the front end edge of the negative electrode conductor is 2-8 mm.
7. The tumor ablation needle for nanoknife according to claim 1, characterized in that: A sunken groove is provided on the negative conductor where the negative insulating sleeve is located; the depth of the groove is adapted to the thickness of the negative insulating sleeve, so that the negative insulating sleeve is flush with the negative conductor.
8. The tumor ablation needle for nanoknife according to claim 1, characterized in that: It also includes a positive electrode terminal and a negative electrode terminal, which are respectively placed in the inner cavity of the handle; the positive electrode terminal is electrically connected to the rear end of the positive conductor and one end of the positive wire, respectively; the negative electrode terminal is electrically connected to the negative conductor and one end of the negative wire, respectively; the other end of the positive wire and the other end of the negative wire extend out of the handle, respectively.
9. The tumor ablation needle for nanoknife according to claim 1, characterized in that: The positive electrode wire and the negative electrode wire are both silicone wires.