Electrode belt pressure high voltage steep pulse tumor ablation needle

Abstract

The utility model relates to a kind of electrode belt pressure's high-voltage steep pulse is used to tumor ablation needle, including needle body, handle and the silica gel high-voltage wire, high-voltage plug, silica gel tube and luer connector of handle rear end;On the ablation electrode outer periphery of the foremost end of ablation needle needle body, there are many small holes, the small hole can pass through negative pressure passage, like suction cup, so that ablation electrode suction tight tumor tissue, electrode and tumor tissue form certain close pressure between, the close pressure can ensure that electrode and tumor tissue reliable contact, prevent high-voltage spark when high-pressure ablation, reduce the loss of ablation voltage, so as to ensure that the effect of ablation is reliable;And the force can avoid ablation needle displacement due to muscle contraction by electric stimulation in the process of ablation operation.

Description

Technical Field

[0001] This utility model relates to a medical device, a high-pressure steep pulse ablation needle suitable for tumor ablation therapy. Background Technology

[0002] High-voltage steep-pulse tumor ablation is a novel tumor ablation technique. It uses ablation electrodes on two parallel ablation needles to release high-voltage pulses onto tumor cells, causing irreversible, nanoscale electroporation of the cell membrane, disrupting intracellular homeostasis, and leading to apoptosis. After tumor cell apoptosis, phagocytes engulf the cell debris, and the treated area is gradually replaced by normal tissue.

[0003] Existing high-voltage steep pulse ablation needles include a needle body, a handle, and electrode input leads and plugs. The needle body is typically made of a conductive medical stainless steel round tube with an insulating sleeve covering it. The front end of the round tube protrudes 15-40 mm from the insulating sleeve, and this protruding part serves as the discharge electrode of the ablation needle. Its tip is sharp and can be used for percutaneous puncture.

[0004] During high-voltage steep pulse ablation surgery, two parallel ablation needles need to be inserted. One ablation needle has its ablation discharge electrode as the positive electrode, while the other has its negative electrode. A high-voltage pulse is input between the two electrodes to ablate the tumor tissue between the two discharge electrodes.

[0005] After a traditional high-voltage steep pulse ablation needle is inserted into the tumor tissue through percutaneous puncture, the ablation needle is in a natural state, and the discharge electrode at the tip of the ablation needle does not have a certain contact pressure with the tumor tissue. This can easily lead to the discharge electrode not being in close contact with the tumor tissue and there will be a certain gap, which can easily cause high-voltage arcing, resulting in the loss of ablation voltage and affecting the ablation effect.

[0006] In addition, the high-voltage steep pulse ablation needle is in a non-fixed natural state. During the operation, because high-voltage steep pulse ablation uses high-voltage pulse discharge ablation, it is highly stimulating to the human body and will cause rhythmic muscle contractions, resulting in displacement of the ablation needle and thus creating surgical risks. A high-voltage steep pulse ablation needle with pressure electrode can effectively solve the above problems. Utility Model Content

[0007] This invention provides a high-voltage steep pulse tumor ablation needle with a pressurized electrode. Numerous small holes are evenly distributed on the outer periphery of the ablation electrode at the very tip of the needle body. These holes, through a negative pressure channel, act like a suction cup, causing the ablation electrode to adhere tightly to the tumor tissue. A certain pressure is formed between the electrode and the tumor tissue, ensuring reliable contact between the electrode and the tumor tissue. This pressure prevents high-voltage arcing during high-voltage ablation, reduces voltage loss, and thus ensures reliable ablation results. Furthermore, this force prevents displacement of the ablation needle due to muscle contraction caused by electrical stimulation during the ablation procedure.

[0008] The technical solution of this utility model is:

[0009] A high-voltage steep pulse tumor ablation needle with electrode pressure includes a needle body, a handle, and a silicone high-voltage wire, a high-voltage plug, a silicone tube, and a Luer connector at the rear end of the handle.

[0010] Its characteristic is that the needle body includes a puncture head, a needle tube, and an insulating sleeve;

[0011] The handle includes a handle body, a terminal block, and a handle end cap; the handle body and handle end cap are made of high-strength ABS polymer material; the terminal block is made of conductive brass material;

[0012] The puncture head is made of ceramic insulating material, cylindrical in shape, and has a sharp puncture tip at the very front end;

[0013] The needle is a hollow cylinder with open ends;

[0014] The insulating sleeve is a hollow cylinder with open ends;

[0015] The puncture head is installed at the very front end of the needle tube, and the insulating sleeve is fitted around the outer periphery of the needle tube;

[0016] The silicone high-voltage wire includes a silicone high-voltage wire conductor and a silicone high-voltage wire insulator; the silicone high-voltage wire insulator is sleeved on the outer periphery of the silicone high-voltage wire conductor.

[0017] The rear ends of the needle tube and insulating sleeve are placed inside the handle. The end of the needle tube is electrically connected to the terminal block inside the handle and the silicone high-voltage conductor. The silicone high-voltage conductor extends out of the handle, and its end is electrically connected to the high-voltage plug.

[0018] The inner hole at the front end of the silicone tube is fitted onto the outer periphery of the outermost end of the needle tube; both are located inside the handle, and the silicone tube extends out of the handle, with a Luer connector installed at its outermost end.

[0019] The handle cover is installed at the rear end of the handle body, through which the silicone high-voltage wire and silicone tube pass;

[0020] Furthermore, the puncture head is preferably made of medical-grade zirconia ceramic;

[0021] Furthermore, the needle tube is made of hollow cylindrical medical stainless steel, preferably medical 316L.

[0022] Furthermore, the insulating sleeve is a hollow cylindrical high-pressure resistant polyimide polymer material.

[0023] Furthermore, the rear end of the puncture head has a stepped structure, with the same inner diameter as the front end of the needle tube. The outer diameter of the front end of the puncture head is the same as the outer diameter of the needle tube, and the two are flush in the diametrical direction after being connected.

[0024] Furthermore, the insulating sleeve is fitted around the outer periphery of the needle tube, and the front end of the needle tube protrudes from the insulating sleeve for a certain length. Small holes are evenly distributed around the outer periphery of the needle tube within this length, and these small holes can allow the inner hole of the needle tube to communicate with the air outside the needle tube.

[0025] Furthermore, the axial length of the tip of the needle protruding from the insulating sleeve is 10-40mm, and this section is the ablation electrode of the ablation needle;

[0026] Furthermore, the rear ends of the needle tube and insulating sleeve are placed inside the handle, and a terminal is installed at the end of the needle tube. The terminal is made of conductive brass and is electrically connected to the conductor of the silicone high-voltage wire. The needle tube, the terminal, and the conductor of the silicone high-voltage wire are electrically connected. The silicone high-voltage wire extends out of the handle, and its end is electrically connected to the high-voltage plug. The electrodes are electrically connected by connecting the positive or negative terminal of the high-voltage power supply to the high-voltage plug.

[0027] Furthermore, the evenly distributed small holes at the outer end of the electrode exposed by the insulating sleeve at the front end of the needle body form a conductive air passage with the inner hole of the needle tube, the silicone tube and the Luer connector. When the electrode is inserted into the tumor tissue and a vacuum pump is connected to the Luer connector, the evenly distributed small holes can act like a suction cup to tightly grip the tumor tissue, so that a certain pressure is formed between the electrode and the tumor tissue.

[0028] Furthermore, the handle also includes a terminal block, which is placed in the inner cavity of the handle body; the end of the needle tube is electrically connected to the terminal block inside the handle and the silicone high-voltage wire conductor; the silicone high-voltage wire extends out of the handle, and its end is electrically connected to the high-voltage plug, so as to provide power to the ablation needle by connecting the positive or negative terminal of the high-voltage power supply to the high-voltage plug.

[0029] The beneficial effects of this utility model are:

[0030] This invention features a reasonable design, simple structure, and convenient use. Numerous small holes are evenly distributed on the outer periphery of the ablation electrode at the very tip of the ablation needle. These holes, acting like suction cups, allow the ablation electrode to adhere tightly to the tumor tissue through a negative pressure channel, creating a certain pressure of contact between the electrode and the tumor tissue. This pressure ensures reliable contact between the electrode and the tumor tissue, prevents high-voltage arcing, reduces ablation voltage loss, and thus guarantees reliable ablation results. Furthermore, this pressure prevents displacement of the ablation needle due to muscle contraction caused by electrical stimulation during the ablation procedure, thereby avoiding surgical risks. Attached Figure Description

[0031] Figure 1 , 2 This is a schematic diagram of the structure of this utility model.

[0032] Figure 3 yes Figure 1 Enlarged sectional view at point A in the middle.

[0033] Figure 4 yes Figure 2 Enlarged sectional view at point B in the middle.

[0034] The components are: 1-needle body; 2-handle; 3-silicone high-voltage lead wire; 4-silicone tube; 5-Luer connector; 6-high-voltage plug.

[0035] 7-Piercing head; 8-Needle; 9-Insulating sleeve; 10-Handle body; 11-Terminal; 12-Silicone high-voltage wire conductor; 13-Silicone high-voltage wire insulator; 14-Handle end cap; Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] like Figure 1 , 2 As shown, a high-voltage steep pulse tumor ablation needle with electrode pressure includes a needle body 1, a handle 2, and a silicone high-voltage wire 3, a high-voltage plug 6, a silicone tube 4, and a Luer connector 5 at the rear end of the handle 2.

[0038] like Figure 3 As shown, the needle body 1 includes a puncture head 7, a needle tube 8, and an insulating sleeve 9; wherein the puncture head 7 is made of medical-grade zirconia ceramic insulating material, and the front end is a sharp puncture tip that can be directly punctured percutaneously; the needle tube 8 is a hollow cylinder with open ends, and is made of medical-grade 316L stainless steel; the insulating sleeve 9 is a hollow cylinder with open ends, and is made of high-pressure resistant polyimide polymer material.

[0039] like Figure 3As shown, the puncture head 7 is installed at the front end of the needle tube 8, and its rear end has a stepped structure and is installed in the hole at the front end of the needle tube 8; the maximum outer diameter of the puncture head 7 is the same as the outer diameter of the needle tube 8, and the two are flush in the diameter direction after they are connected.

[0040] The puncture head 7 and the needle tube 8 are reliably connected with medical adhesive, and there is no air leakage at the connection point;

[0041] like Figure 3 As shown, the insulating sleeve 9 is sleeved on the outer periphery of the needle tube 8; the axial length of the front end of the needle tube 8 protruding from the front end of the insulating sleeve 9 is 25mm, and this section is the ablation electrode of the ablation needle; 15 small holes of 0.3mm are evenly distributed on the inner and outer periphery of the 25mm electrode, and these small holes are connected to the inner hole of the needle tube 9.

[0042] like Figure 4 As shown, the rear ends of the needle tube 8 and the insulating sleeve 9 are placed inside the handle 2. The end of the needle tube 8 is equipped with a terminal 11, which is made of conductive brass. The terminal 11 is electrically connected to the silicone high-voltage wire conductor 12. The needle tube 9, the terminal 11, and the silicone high-voltage wire conductor 12 are electrically connected.

[0043] like Figure 1 , 4 As shown, the silicone high-voltage wire 3 includes a silicone high-voltage wire conductor 12 and a silicone high-voltage wire insulator 13; the silicone high-voltage wire insulator is sleeved on the outer periphery of the silicone high-voltage wire conductor; the silicone high-voltage wire 3 extends outward to a handle 2, the end of which is electrically connected to a high-voltage plug 6, and the electrodes are energized by connecting the positive or negative terminal of a high-voltage power supply to the high-voltage plug 6; wherein the high-voltage plug 6 is an externally purchased component.

[0044] like Figure 1 , 3 As shown, 15 small holes of 0.3mm are evenly distributed on the inner and outer circumference of the 25mm electrode. These small holes are connected to the inner hole of the needle tube 9. The inner hole of the front end of the silicone tube 4 is fitted onto the outer circumference of the outermost end of the needle tube 8 and is reliably sealed and connected with medical glue. The silicone tube 4 extends outward to the handle 8, and its outermost end is connected to a Luer connector 5, which is an externally purchased part. When the Luer connector 5 is connected to an external vacuum pump, the evenly distributed small holes can act like a suction cup to firmly suction the tumor tissue, so that a certain pressure is formed between the electrode and the tumor tissue.

[0045] like Figure 1 , 4 As shown, the handle 2 includes a handle body 10, a terminal block 11, and a handle end cap 14; the handle body 10 and the handle end cap 14 are made of high-strength ABS polymer material; the handle end cap 14 is installed at the rear end of the handle body 10, and a silicone high-voltage wire 3 and a silicone tube 4 pass through it;

[0046] This invention features numerous small holes evenly distributed around the outer periphery of the ablation electrode at the very tip of the ablation needle. These holes, acting like suction cups, allow the ablation electrode to adhere tightly to the tumor tissue through a negative pressure channel, creating a certain pressure of contact between the electrode and the tumor tissue. This pressure ensures reliable contact between the electrode and the tumor tissue, prevents high-voltage arcing, reduces ablation voltage loss, and thus guarantees reliable ablation results. Furthermore, this pressure prevents displacement of the ablation needle due to muscle contraction caused by electrical stimulation during the ablation procedure, thereby avoiding surgical risks.

[0047] The parts not covered in this utility model are the same as or can be implemented using existing technologies.

Claims

1. A high-voltage steep pulse tumor ablation needle with electrode pressure, comprising a needle body, a handle, and a silicone high-voltage lead wire, a high-voltage plug, a silicone tube, and a Luer connector at the rear end of the handle, characterized in that, The needle body includes a puncture head, a needle tube, and an insulating sleeve. The silicone high-voltage wire includes a silicone high-voltage wire conductor and a silicone high-voltage wire insulator, with the silicone high-voltage wire insulator fitted around the outer periphery of the silicone high-voltage wire conductor. The handle includes a handle body, a terminal block, and a handle end cap. The puncture head is made of ceramic insulating material, cylindrical in shape, and pointed at its front end. The needle tube is a hollow cylinder with open ends, and the insulating sleeve is a hollow cylinder with open ends. The puncture head is installed at the front end of the needle tube, and the insulating sleeve is fitted around the outer periphery of the needle tube. The rear ends of the needle tube and the insulating sleeve are located inside the handle. The end of the needle tube is electrically connected to the terminal block inside the handle and the silicone high-voltage wire conductor. The silicone high-voltage wire extends out of the handle, and its end is electrically connected to a high-voltage plug. The inner hole at the front end of the silicone tube is fitted around the outer periphery of the last end of the needle tube, both located inside the handle, and the silicone tube extends out of the handle, with a Luer connector installed at its last end. The handle cap is installed at the rear end of the handle body, through which the silicone high-voltage wire and the silicone tube pass.

2. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The puncture head is made of ceramic material, with a sharp puncture tip at the very front.

3. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The syringe is made of hollow cylindrical medical-grade stainless steel, which is conductive.

4. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The insulating sleeve is a hollow cylindrical polyimide polymer material that is resistant to high voltage.

5. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The rear end of the puncture head has a stepped structure, which is the same as the inner diameter of the front end of the needle tube. The outer diameter of the front end of the puncture head is the same as the outer diameter of the needle tube. After the two are connected, they are flush in the diametrical direction.

6. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, An insulating sleeve is fitted around the outer periphery of the needle tube, with the front end of the needle tube protruding from the insulating sleeve for a certain length. Small holes are evenly distributed around the outer periphery of the needle tube within this length, allowing the inner hole of the needle tube to communicate with the air outside the needle tube.

7. The high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 6, characterized in that, The axial length of the tip of the needle protruding from the insulating sleeve is 10-40mm, and this section is the ablation electrode of the ablation needle.

8. A high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The rear ends of the needle tube and insulating sleeve are placed inside the handle. A terminal is installed at the end of the needle tube, and the terminal is electrically connected to the conductor of the silicone high-voltage wire. The needle tube, the terminal, and the conductor of the silicone high-voltage wire are electrically connected. The silicone high-voltage wire extends out of the handle, and its end is electrically connected to the high-voltage plug. The electrodes are energized by connecting the positive or negative terminal of the high-voltage power supply to the high-voltage plug.

9. A high-voltage steep pulse tumor ablation needle with electrode pressure according to claim 1, characterized in that, The evenly distributed small holes at the tip of the needle, which protrude from the insulating sleeve, form a conductive air passage with the inner hole of the needle tube, the silicone tube, and the Luer connector. When the electrode is inserted into the tumor tissue and a vacuum pump is connected to the Luer connector, the evenly distributed small holes can act like a suction cup to firmly adhere to the tumor tissue, so that a certain pressure is formed between the electrode and the tumor tissue.

10. The high-voltage steep pulse tumor ablation needle according to claim 1, characterized in that, The handle also includes a terminal block, which is located inside the handle body; the end of the needle tube is electrically connected to the terminal block inside the handle and the silicone high-voltage wire conductor; the silicone high-voltage wire extends out of the handle, and its end is electrically connected to the high-voltage plug, which is connected to the positive or negative terminal of the high-voltage power supply to supply power to the ablation needle.

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