Telescopic plasma electrode

Abstract

The utility model relates to a telescopic plasma electrode, which comprises an electrode tip end, a metal tube and a sliding component, the rear end of the electrode tip end is sleeved with an insulating tube which is embedded in the front end of the metal tube. The tail part of the metal tube is arranged on the binding post; the sliding assembly comprises a manual adjusting rod and a traction index. The manual adjusting rod is installed on the binding post in a sliding mode. A through hole extending in the front-back direction is formed in the insulating tube, the rear end of the traction index is connected with the binding post, and the traction index is connected with the electrode tip end; a positive wire and a negative wire which are connected with the cable are arranged in the binding post; the positive wire is connected with the rear end of the electrode tip end; the cathode wire is connected with the rear end of the metal tube. The utility model has the advantages that the electrode tip end is telescopic, so that the amount of cut tissues can be large when the extension amount of the electrode tip end is large, and the fine operation degree of a needle-shaped electrode can be achieved when the extension amount of the electrode tip end is small; the electrode tip end has the advantages of being high in cutting efficiency and capable of conducting fine operation at the same time.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a retractable plasma electrode. Background Art

[0002] Prostatic hyperplasia, also known as benign prostatic hyperplasia, abbreviated as BPH (Benign Prostatic Hyperplasia), is the most common benign disease that causes urination disorders in middle-aged and elderly men. The main manifestations of this disease in histology and anatomy are the hyperplasia and increase in the size of the prostate gland. Prostatic hyperplasia is a very common phenomenon for men. Generally, men will gradually develop prostatic hyperplasia after the age of 40. At the age of 80, this figure can reach 90%. Among all patients with prostatic hyperplasia, about half of them will have moderate to severe symptoms of urination, which will seriously affect the patient's quality of life.

[0003] The bipolar plasma system itself can form a complete circuit, and can generate a plasma sphere with high thermal energy when working. The energy generated by this plasma sphere composed of highly ionized particles can destroy the chemical bonds in biological macromolecules, and is now used for operations such as cutting, vaporization and electrocoagulation of tissues. The bipolar plasma system is mainly composed of a plasma generator, a disposable plasma electrode, an endoscopic operation and camera system, a cold light source, etc. The electrode itself forms a circuit, and the current does not pass through the human body. Normal saline can be used as an irrigation fluid during the operation. The procedures commonly used in clinical practice with bipolar plasma systems mainly include transurethral plasmakinetic resection of prostate (PKRP) and transurethral plasmakinetic enucleation of the prostate (PKEP).

[0004] During the PKRP operation, the hyperplastic tissue is removed by repeatedly cutting the tissue with a disposable plasma electrode. During the operation, it is necessary to stop bleeding while cutting. The most important thing about PKRP is to avoid cutting too deep during the operation, which can easily lead to capsule perforation and urethral sphincter damage, leading to a series of postoperative complications such as urine extravasation. PKEP is a type of enucleation, which is currently the most commonly used procedure in clinical practice. This procedure makes full use of the surgical capsule of the prostate. During the operation, the endoscope sheath is used to perform blunt dissection of the gland to achieve the maximum level of anatomical enucleation. The prostate capsule may not be uniformly on the same level. The prostate lobes are similar to garlic cloves, each with its own capsule. When free, go shallow rather than deep. Special attention should be paid when the prostate is too large. Due to the large size of the prostate, the capsule becomes thinner and it is very easy to penetrate the capsule during enucleation.

[0005] Both PKRP and PKEP procedures are difficult to master, mainly to address the problem of capsule perforation during surgery, which requires a fine disposable plasma electrode and a fine head electrode to cooperate with the doctor's fine operation. Currently known disposable plasma electrode heads are all fixed in a certain shape, the most common of which are thick circular ring, needle-shaped, and thin circular ring electrodes. The thick circular ring electrode removes more tissue each time and has high cutting efficiency, but its size is large and it is difficult to accurately cut the position with tricky angles. In the area close to the capsule, if too much tissue is cut at one time, it is very easy to cut through the capsule and cause serious complications; the needle-shaped electrode is more suitable for PKEP, with strong directionality and clear anatomical layers. After acting on the tissue, it will not produce a large amount of black eschar that affects the identification of the anatomical structure. It can also lift the tissue and then cut to avoid damaging the surrounding important tissues and organs, which is especially applicable when freeing the middle lobe. However, the disadvantages of the needle electrode are also obvious. The needle tip is relatively thin, and it is difficult to pick up a larger prostate. There is also a certain risk of the needle tip breaking. In addition, it is not suitable for PKRP and the cutting efficiency is too low. The fine circular electrode is a combination of the characteristics of the thick circular electrode and the needle electrode. Although its efficiency is not as good as that of the thick circular electrode, it is higher than that of the needle electrode. Although it is not as good as the needle electrode for fine operations, it is better than the thick ring electrode. It has a more moderate usage and is also the most commonly used electrode.

[0006] The existing plasma electrode tips are all fixed in a certain shape. Although there are many shapes for doctors to choose from, no electrode can have the characteristics of high cutting efficiency and fine operation at the same time. Often, only one of them can be selected because the characteristics of the electrodes required are contradictory. High efficiency requires a thick electrode, but a thick electrode cannot be finely operated. Fine operation requires a small electrode, but a small electrode cannot be finely operated. In some complex cases, doctors may need to meet different needs by changing electrodes during surgery, which increases the cost of equipment, prolongs the operation time, and increases the probability of accidents during the exchange process. The retractable electrode tip provided in this patent can cut more tissue when the electrode tip protrudes more, and the efficiency is comparable to that of a thick circular electrode. When the electrode tip protrudes less, it can achieve the fine operation level of a needle electrode. Doctors can also adjust the extension of the electrode tip to the most suitable degree through multiple simulated uses to meet the customized surgical needs of different doctors.

[0007] Chinese patent CN213075902U discloses a surgical electrode device for an electrosurgeon, which includes an electrode structure, an outer sheath and a waterproof structure; the outer sheath is wrapped around the outside of part of the electrode structure, and the first end of the electrode structure is not wrapped by the outer sheath, and the electrode structure is used to be directly or indirectly electrically connected to a power source; the waterproof structure is annular and is arranged around the outside of the outer sheath; the shape and size of the outer contour of the waterproof structure match the inner diameter of the electrode channel of the electrosurgeon for accommodating the surgical electrode device, and the shape and size of the inner contour of the waterproof structure match the outer wall of the outer sheath. This design fixes the shape of the electrode tip and has low cutting efficiency. Summary of the invention

[0008] The purpose of the utility model is to provide a retractable plasma electrode, which is improved on the basis of a traditional plasma electrode, and the electrode tip is modified to be retractable. This retractable plasma electrode is used in transurethral electroresection of the prostate or transurethral enucleation of the prostate, which can reduce the number of times the electrode ring is replaced during the operation, improve the efficiency of the operation and reduce the difficulty of the operation, and ensure the success rate of the operation, especially in the operation of large-volume prostate hyperplasia. This situation is more obvious.

[0009] The utility model is realized by the following technical scheme: a retractable plasma electrode, which comprises

[0010] The electrode tip 1, a pair of metal tubes 3 and a terminal 5; the tails of the pair of metal tubes 3 are connected to the terminal 5;

[0011] The front end of the metal tube 3 is sleeved with an insulating tube 2, the electrode tip 1 is U-shaped, and the two ends of the electrode tip 1 are respectively extended into the insulating tubes 2 at the front ends of the two metal tubes 3;

[0012] The two ends of the electrode tip 1 are respectively connected with a pulling index 7, which extends through the metal tube 3 into the terminal 5 and passes through the through hole provided on the side wall of the metal tube 3 to be connected with the sliding structure provided on the terminal 5; so that the sliding structure can be pushed forward and backward to drive the electrode tip 1 to move forward and backward, wherein the insulating tube 2 ensures that the electrode tip 1 does not contact the metal tube 3 when moving;

[0013] It also includes a positive lead 6 and a negative lead 9;

[0014] The positive electrode wire 6 is arranged inside the metal tube 3, the front end of the positive electrode wire 6 is connected to the electrode tip 1, and the rear end of the positive electrode wire 6 extends out of the metal tube 3 and is connected to the cable;

[0015] The front end of the negative electrode wire 9 is connected to the end of the metal tube 3 and connected to the cable;

[0016] The main body is an electrode structure, which includes an electrode head 1, a metal tube 3 and a sliding assembly 4 provided at the front and rear. The end of the electrode head 1 is sleeved with an insulating tube 2 and is connected with the metal tube 3 through the insulating tube 2.

[0017] The rear end of the metal tube 3 extends into the sliding assembly 4;

[0018] The electrode tip 1 is provided with a pulling index 7 inside, and the pulling index 7 extends into the sliding assembly 4 through the inside of the metal tube 3 and is connected with the sliding assembly 4;

[0019] The sliding assembly 4 can drive the pulling index 7 to move forward and backward, thereby driving the electrode tip 1 to move forward and backward;

[0020] The electrode structure is also connected to positive and negative electrodes;

[0021] The positive and negative electrodes include a terminal 5, a positive electrode wire 6 and a negative electrode wire 9;

[0022] The terminal post 5 is connected to the rear of the sliding assembly, and a circular hole groove 10 is provided at the lower end of the terminal post;

[0023] The positive electrode wire 6 is arranged inside the metal tube 3, the front end of the positive electrode wire 6 is connected to the electrode tip 1, and the rear end of the positive electrode wire 6 extends out of the round hole groove 10 and is connected to the cable;

[0024] The front end of the negative electrode wire 9 is connected to the end of the metal tube 3 , and the rear end of the negative electrode wire 9 extends out of the round hole groove 10 and is connected to the cable.

[0025] Compared with the previous technology, the beneficial effects of the utility model are:

[0026] 1. The electrode tip of the utility model is retractable. When the electrode tip is extended to a greater extent, the amount of tissue cut can be relatively large, and the efficiency is comparable to that of a thick circular electrode. When the electrode tip is extended to a lesser extent, the fine operation level of a needle-shaped electrode can be achieved, so that the electrode tip can have both the advantages of high cutting efficiency and the ability to perform fine operations.

[0027] 2. Doctors can adjust the extension of the electrode tip to the most suitable level through multiple simulations to meet the customized surgical needs of different doctors. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a top view of embodiment 1 of the utility model;

[0029] Figure 2 This is a schematic diagram of the metal tube split structure of Example 1;

[0030] Figure 3It is a schematic diagram of the side structure of Example 1 of the utility model at the longest telescopic amount;

[0031] Figure 4 This is a schematic diagram of the side structure of Example 1 of the utility model when the shortest extension amount is reached;

[0032] Figure 5 This is a schematic structural diagram of the electrode tip end at the longest extension amount of Example 1 of the utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the electrode tip end when the shortest extension amount is achieved in Example 1 of the utility model;

[0034] Figure 7 It is a schematic diagram of the position of the hand-adjusting rod when the utility model has the longest extension amount;

[0035] Figure 8 This is a schematic diagram of the position of the hand-adjustable rod when the utility model has the shortest telescopic amount;

[0036] Fig. 9 is a schematic diagram of a sliding assembly;

[0037] Fig.10 A schematic diagram of the longest extension amount of the electrode tip in the second embodiment;

[0038] Fig.11 Schematic diagram of the shortest extension amount of the electrode tip under the second embodiment.

[0039] Explanation of reference numerals: 1 electrode tip, 11 semicircular ring, 12 straight rod, 2 insulating tube, 3 metal tube, 31 front straight tube section, 32 rear straight tube section, 33 middle oblique tube section, 4 sliding assembly, 41 guide hole, 42 hand-adjusting rod, 421 rough surface, 43 limit groove, 44 marking scale, 5 terminal, 6 positive electrode wire, 7 pulling index, 8 crimping metal tube, 9 negative electrode wire, 10 round hole groove. DETAILED DESCRIPTION

[0040] The utility model is described in detail below in conjunction with the accompanying drawings, but the protection content of the utility model is not limited to the following:

[0041] like Figures 1 to 11 As shown, a retractable plasma electrode comprises

[0042] The electrode tip 1, a pair of metal tubes 3 and a terminal 5; the tails of the pair of metal tubes 3 are connected to the terminal 5;

[0043] The front end of the metal tube 3 is sleeved with an insulating tube 2, the electrode tip 1 is U-shaped, and the two ends of the electrode tip 1 are respectively extended into the insulating tubes 2 at the front ends of the two metal tubes 3;

[0044] The two ends of the electrode tip 1 are respectively connected with a pulling index 7, which extends through the metal tube 3 into the terminal 5 and passes through the through hole provided on the side wall of the metal tube 3 to be connected with the sliding structure provided on the terminal 5; so that the sliding structure can be pushed forward and backward to drive the electrode tip 1 to move forward and backward, wherein the insulating tube 2 ensures that the electrode tip 1 does not contact the metal tube 3 when moving;

[0045] It also includes a positive lead 6 and a negative lead 9;

[0046] The positive electrode wire 6 is arranged inside the metal tube 3, the front end of the positive electrode wire 6 is connected to the electrode tip 1, and the rear end of the positive electrode wire 6 extends out of the metal tube 3 and is connected to the cable;

[0047] The front end of the negative electrode wire 9 is connected to the end of the metal tube 3 and connected to the cable;

[0048] Specifically, the main body is an electrode structure, which includes an electrode head 1, a metal tube 3 and a sliding assembly 4 provided at the front and rear. The end of the electrode head 1 is sleeved with an insulating tube 2 and is connected to the metal tube 3 through the insulating tube 2.

[0049] The rear end of the metal tube 3 extends into the sliding assembly 4;

[0050] The electrode tip 1 is provided with a pulling index 7 inside, and the pulling index 7 extends into the sliding assembly 4 through the inside of the metal tube 3 and is connected with the sliding assembly 4;

[0051] The sliding assembly 4 can drive the pulling index 7 to move forward and backward, thereby driving the electrode tip 1 to move forward and backward;

[0052] The electrode structure is also connected to positive and negative electrodes;

[0053] The positive and negative electrodes include a terminal 5, a positive electrode wire 6 and a negative electrode wire 9;

[0054] The terminal post 5 is connected to the rear of the sliding assembly, and a circular hole groove 10 is provided at the lower end of the terminal post;

[0055] The positive electrode wire 6 is arranged inside the metal tube 3, the front end of the positive electrode wire 6 is connected to the electrode tip 1, and the rear end of the positive electrode wire 6 extends out of the round hole groove 10 and is connected to the cable;

[0056] The front end of the negative electrode wire 9 is connected to the end of the metal tube 3 , and the rear end of the negative electrode wire 9 extends out of the round hole groove 10 and is connected to the cable.

[0057] As can be seen from the figure, the rear end of the electrode tip 1 is sleeved with an insulating tube 2, and the insulating tube 2 is embedded in the front end of the metal tube 3, so that when the electrode tip 1 moves back and forth in the insulating tube 2, the electrode tip 1 never contacts the metal tube 3;

[0058] The tail of the metal tube 3 is mounted on the terminal 5;

[0059] The sliding assembly 4 includes a manual adjustment rod 42 and a pulling index 7. The manual adjustment rod 42 is slidably mounted on the terminal post 5 and can slide forward and backward on the terminal post 5. A through hole extending forward and backward is opened on the insulating tube 2. The rear end of the pulling index 7 is connected to the terminal post 5, and the pulling index 7 passes through the through hole and is connected to the electrode tip 1 through the metal tube 3. Therefore, pushing the manual adjustment rod 42 can drive the electrode tip 1 to move forward and backward.

[0060] The terminal 5 is provided with a positive wire 6 and a negative wire 9 of a connecting cable; the positive wire 6 passes through the metal tube 3 and is connected to the rear end of the electrode head; the negative wire 9 is directly connected to the rear end of the metal tube 3.

[0061] The function of the insulating tube 2 is to prevent the electrode tip 1 from directly contacting the metal tube 3, thereby avoiding the possibility of abnormal conduction forming a short circuit.

[0062] Under this design, the utility model can have the advantages of high cutting efficiency and fine operation at the same time. When the electrode tip 1 extends a lot, the amount of tissue that can be cut increases, thereby improving the cutting efficiency, and the cutting efficiency is comparable to that of a thick circular ring electrode; when the electrode tip 1 extends a little, it can achieve the fine operation level of a needle electrode. Doctors can also adjust the extension of the electrode tip to the most suitable level through multiple simulated uses to meet the customized surgical needs of different doctors. In the utility model, a conductive substance such as physiological saline is used as a medium to form a loop, which is a conventional technology for plasma electrodes, so it will not be repeated.

[0063] The electrode tip 1 is made of shape memory metal material;

[0064] The electrode tip 1 comprises a front semicircular ring 11, two rear straight rods 12 and an insulating tube 2 sleeved on the ends of the two straight rods 12;

[0065] The radius of the semicircular ring 11 gradually increases from the center to both ends, and the semicircular ring of the electrode tip 1 bends upward to form a certain angle with the straight rod 12;

[0066] Two straight rods 12 extend parallel to the upper and lower ends of the semicircular ring 11 .

[0067] The metal pipe 3 includes a front straight pipe section 31, a rear straight pipe section 32 connected front and rear, and a middle oblique pipe section 33 connected between the front straight pipe section 31 and the rear straight pipe section 32. The rear straight pipe section 32 is provided with a small hole in the rear section for the pulling index 7 to pass through.

[0068] The front straight pipe sections 31 of the two metal pipes 3 are connected with the two sections of insulating pipes 2 , and the rear straight pipe sections 32 of the two metal pipes 3 are horizontally parallel and attached.

[0069] According to the shape of the electrode tip 1, the utility model derives the following two embodiments: Embodiment 1:

[0070] like Figure 1-6 As shown: the electrode tip end 1 is a U-shaped electrode tip;

[0071] The metal tube 3 is a double tube structure, and any one tube of the double tube structure is divided into a front straight tube section 31, a middle oblique tube section 33, and a rear straight tube section 32 which are sequentially connected from front to rear, and the two rear straight tube sections 32 are fitted together, so that the double tube structure is Y-shaped;

[0072] like Figure 5-8 As shown: the front ends of the two front straight tube sections 31 are both embedded with insulating tubes 2, and the two ends of the U-shaped electrode head extend into the two insulating tubes 2 respectively; any tube body of the double-tube structure is provided with a pulling index 7, the front end of the pulling index 7 is connected to the end of the U-shaped electrode head, and the rear end of the pulling index 7 passes through the through hole opened on the side wall of the rear straight tube section 32 and is connected to the hand-adjusting rod 42;

[0073] The positive electrode wire 6 passes through one of the tubes and is connected to one end of the U-shaped electrode head; the negative electrode wire 9 is connected to the rear end of the other tube.

[0074] Since the electrode tip end 1 is a U-shaped electrode tip, the U-shaped electrode tip is made of a memory metal material, specifically a nickel-titanium alloy.

[0075] The U-shaped electrode head is divided into a front semicircular ring 11 and a rear straight rod 12, and the straight rod 12 extends into the insulating tube 2;

[0076] The semicircular ring 11 is bent upward to form a certain angle with the straight rod 12 .

[0077] The radius of the semicircular ring 11 gradually increases from the center to both ends, and the semicircular ring of the electrode tip 1 bends upward to form a certain angle with the straight rod 12 .

[0078] like Figure 5 As shown, since the U-shaped electrode head is made of memory metal material; the circular ring at the electrode tip end 1 is of variable diameter, with a small diameter in the middle and gradually increasing diameters on both sides. This design is to allow the doctor to adjust the electrode tip end 1 to a smaller extension amount so that more precise operations can be performed; when the extension amount is larger, a larger cutting amount can be achieved, with higher cutting efficiency.

[0079] like Figure 3 The electrode tip 1 is shown in the state where it is extended to the maximum extent, the portion of the straight rod 12 in the ceramic tube 2 is relatively short, and the ring of the electrode tip 1 is bent at an angle, which makes it easier for doctors to cut prostate tissue. Figure 4The state shown is the state where the electrode tip 1 is extended to the minimum, and the portion of the straight rod 12 in the ceramic tube 2 is relatively long. If the commonly used electrode materials tungsten or titanium are selected, they are both hard metals and cannot be deformed. The angle of the folded corner will be stuck, and forcibly pulling it into the insulating tube will cause the electrode material to break. If a soft electrode material is selected, the electrode tip 1 will not be able to restore the original angle after it is inserted into the insulating tube 2 and then extended out, and will become an angle parallel to the axial direction of the insulating tube 2. Therefore, the material of the electrode tip 1 of the utility model needs to be a superelastic shape memory metal nickel-titanium alloy. Its characteristic is that the material can be formed into a circular ring of a certain angle at high temperature. At room temperature, it will have superelasticity and shape memory. The superelasticity can make it be received in the insulating tube 2, and the shape memory makes it return to its original shape when it is extended out of the insulating tube 2 again, thereby realizing the functions required by the utility model.

[0080] The rear end of the pulling index 7 passes through the straight rod 12 , the front straight pipe section 31 , and the middle oblique pipe section 33 , and then extends out from the small hole of the rear straight pipe section 32 and is connected to the sliding component 4 .

[0081] The lower end surface of the sliding assembly 4 is provided with a guide hole 41 extending forward and backward, and a hand-adjustable rod 42 sliding on the guide hole 41. The guide hole 41 is also provided with a plurality of regularly arranged limiting grooves 43.

[0082] The rear end of the pulling index 7 is connected to the manual adjustment rod 42 , so that the manual adjustment rod 42 can slide on the guide hole 41 to drive the electrode tip 1 to extend and retract, and the manual adjustment rod 42 is limited by the limiting groove 43 .

[0083] Specifically, a guide hole 41 extending forward and backward is formed on the sliding assembly 4 , a manual adjustment rod 42 extends out of the guide hole 41 , and a plurality of limit grooves 43 are formed on both sides of the guide hole 41 .

[0084] The rear end of the pulling index 7 is connected to a crimping metal tube 8 and is connected to the hand-adjusting rod 42 through the crimping metal tube 8;

[0085] The upper portion of the manual adjustment lever is provided with a rough surface 421 which is matched with the crimped metal tube 8 .

[0086] Specifically, the rear end of the pulling index 7 is connected to the manual adjustment rod 42, so that the manual adjustment rod 42 can slide on the guide hole 41 to drive the electrode tip 1 to extend and retract, and the manual adjustment rod 42 is limited by the limit groove 43. Figures 7 to 8 As shown. When the manual adjustment rod 42 slides forward and backward on the guide hole 41, it drives the pulling index 7 to move forward and backward together, and the pulling index 7 drives the electrode tip 1 to move forward and backward, so that the amount of the electrode tip 1 extending outside the ceramic tube can be increased or decreased. The size of the electrode tip 1 can be fixed by moving the manual adjustment rod 42 to the limiting groove 43 at a suitable position.

[0087] The guide hole 41 is provided with 9 limiting grooves 43, and the limiting grooves 43 are staggered along the two sides of the extending direction of the guide hole 41; one side of the guide hole 41 is provided with 4 limiting grooves 43, and the other side is provided with 5 limiting grooves 43;

[0088] The nine limiting grooves 43 are provided with marking scales 44 numbered 1 to 9, and the limiting grooves 43 correspond to numbers 1 to 9 from the position close to the electrode tip end 1 to the position far from the electrode tip end.

[0089] The manual adjustment rod 42 can be inserted into any limiting groove 43 . The number and serial number of the limiting grooves 43 are not fixed and can be redesigned according to the requirements.

[0090] The state where the electrode tip 1 extends the longest is Figure 5 ,and Figure 7 The position of the manual adjustment rod 42 shown in FIG. 1 corresponds to the position of the manual adjustment rod 42. The marking scale 44 of the manual adjustment rod 42 in this position is numbered 1; the state where the electrode tip 1 extends the shortest is Figure 6 ,and Figure 8 Corresponding to the position of the manual adjustment lever shown, the identification scale 44 of the manual adjustment lever 42 when in this position is numbered 9.

[0091] The rear end of the pulling index 7 is connected with a crimping metal tube 8 and is connected with the manual adjustment rod 42 through the crimping metal tube 8 .

[0092] The upper part of the hand-adjustable lever is provided with a rough surface 421 which is connected with a crimping metal tube 8. Here, the crimping metal tube 8 is first sleeved on the rear end of the pulling index 7 and then crimped with a crimping pliers, so as to bring the rear ends of the two traction cables together.

[0093] The insulating tube is made of materials with high temperature resistance and excellent electrical insulation performance, such as ceramics, PVDF, PTFE, polyparaxylene, nylon, compliant high temperature silicone resin and other non-metallic materials or other materials that meet the performance requirements.

[0094] The electrode tip and metal tube are made of materials with excellent conductivity and high temperature resistance, such as stainless steel, tungsten alloy, titanium alloy, platinum-iridium alloy and other metals and alloys or other materials that meet the performance requirements. Materials such as ceramics are good insulating materials and also have the advantages of corrosion resistance, high temperature resistance, high hardness and low density. Materials such as stainless steel have good strength and smooth surface, which is not easy to adhere to bacteria and dirt and is easy to clean and disinfect.

[0095] The lower end of the terminal 5 is provided with a circular hole slot 10;

[0096] The rear ends of the positive electrode wire 6 and the negative electrode wire 9 extend out of the round hole groove 10 and the connection cable.

[0097] The front end of the negative electrode wire 9 is connected to the end of the metal tube 3, and the rear end of the negative electrode wire 9 extends out of the circular hole slot 10 and is connected to the cable. After the positive electrode wire 6 and the negative electrode wire 9 leave the terminal 5, they are connected to the cable and serve as one pole of the plasma bipolar. Figure 7 and Figure 8 It can be found that when the electrode tip 1 moves due to the pulling index 7, the length of the positive electrode wire 6 will also change, and there is enough cavity in the terminal 5 to allow the positive electrode wire 6 to have enough space to move.

[0098] Since the shape memory metal material used in the electrode tip 1 is nickel-titanium alloy, nickel-titanium alloy has a strong shape memory ability and is commonly used in medical equipment, automobiles or aerospace fields. It also has high elasticity, high corrosion resistance and high temperature stability, and is very suitable as a material for the utility model. Embodiment 2:

[0099] The electrode tip 1 is an electrode tip. The electrode tip 1 is not limited to a circular ring design, and can also be designed as follows: Fig.10 and Fig.11 Needle electrode tip as shown or other shapes.

[0100] Although the utility model uses specific embodiments and their alternatives to illustrate and describe the utility model, it should be understood that various changes and modifications can be implemented as long as they do not deviate from the spirit and scope of the utility model. Therefore, it should be understood that except for the limitations of the attached claims and their equivalents, the utility model is not limited in any sense.

Claims

1. A retractable plasma electrode, characterized in that: It includes An electrode tip (1), a pair of metal tubes (3) and a terminal (5); the tail ends of the pair of metal tubes (3) are connected to the terminal (5); The front end of the metal tube (3) is sheathed with an insulating tube (2); the electrode tip (1) is U-shaped, and both ends of the electrode tip (1) extend into the insulating tubes (2) at the front ends of the two metal tubes (3); Both ends of the electrode tip (1) are respectively connected to pulling indexes (7), and the pulling indexes (7) extend through the metal tube (3) into the terminal post (5) and pass through a through hole provided on the side wall of the metal tube (3) to be connected to a sliding structure provided on the terminal post (5); so that the sliding structure can be pushed forward and backward to drive the electrode tip (1) to move forward and backward, wherein the insulating tube (2) ensures that the electrode tip (1) does not contact the metal tube (3) when moving; It also includes a positive lead (6) and a negative lead (9); The positive electrode wire (6) is arranged inside the metal tube (3), the front end of the positive electrode wire (6) is connected to the electrode head end (1), and the rear end of the positive electrode wire (6) extends out of the metal tube (3) and is connected to the cable; The front end of the negative electrode wire (9) is connected to the end of the metal tube (3) and is connected to a cable; The main body is an electrode structure, which comprises an electrode head end (1) provided at the front and rear, a metal tube (3) and a sliding assembly (4); an insulating tube (2) is sleeved on the end of the electrode head end (1) and is connected to the metal tube (3) through the insulating tube (2); The rear end of the metal tube (3) extends into the sliding assembly (4); A pulling index (7) is provided inside the electrode tip (1), and the pulling index (7) extends through the interior of the metal tube (3) into the sliding assembly (4) and is cooperatively connected with the sliding assembly (4); The sliding assembly (4) can drive the pulling index (7) to move forward and backward, thereby driving the electrode tip (1) to move forward and backward; The electrode structure is also connected to positive and negative electrodes; The positive and negative electrodes include a terminal (5), a positive electrode wire (6) and a negative electrode wire (9); The terminal post (5) is connected to the rear of the sliding assembly, and a circular hole groove (10) is provided at the lower end of the terminal post; The positive electrode wire (6) is arranged inside the metal tube (3), the front end of the positive electrode wire (6) is connected to the electrode head end (1), and the rear end of the positive electrode wire (6) extends out of the circular hole groove (10) and is connected to the cable; The front end of the negative electrode wire (9) is connected to the end of the metal tube (3), and the rear end of the negative electrode wire (9) extends out of the circular hole groove (10) and is connected to the cable.

2. A retractable plasma electrode according to claim 1, characterized in that: The electrode tip (1) is made of a shape memory metal material; The electrode tip (1) comprises a front semicircular ring (11), two rear straight rods (12), and an insulating tube (2) sleeved on the ends of the two straight rods (12). The radius of the semicircular ring (11) gradually increases from the center to both ends, and the semicircular ring at the electrode head end (1) is bent upward to form a certain angle with the straight rod (12); Two straight rods (12) extend parallel to the upper and lower ends of the semicircular ring (11).

3. A retractable plasma electrode according to claim 2, characterized in that: The metal pipe (3) comprises a front straight pipe section (31) and a rear straight pipe section (32) connected front and rear, and a middle oblique pipe section (33) connected between the front straight pipe section (31) and the rear straight pipe section (32); the rear straight pipe section (32) is provided with a small hole at the rear section through which the pulling index (7) can pass; The front straight pipe sections (31) of the two metal pipes (3) are cooperatively connected with the two sections of insulating pipes (2), and the rear straight pipe sections (32) of the two metal pipes (3) are horizontally parallel and abutted.

4. A retractable plasma electrode according to claim 3, characterized in that: The rear end of the pulling index (7) passes through the straight rod (12), the front straight pipe section (31), and the middle oblique pipe section (33), and then extends out from the small hole of the rear straight pipe section (32) and is connected to the sliding assembly (4).

5. A retractable plasma electrode according to claim 4, characterized in that: The lower end surface of the sliding assembly (4) is provided with a guide hole (41) extending forward and backward, and a hand-adjustable rod (42) slidably arranged on the guide hole (41); the guide hole (41) is also provided with a plurality of regularly arranged limiting grooves (43); The rear end of the pulling index (7) is connected to the manual adjustment rod (42), so that the manual adjustment rod (42) can drive the electrode head end (1) to extend and retract by sliding on the guide hole (41), and the manual adjustment rod (42) is limited by the limiting groove (43).

6. A retractable plasma electrode according to claim 5, characterized in that: The rear end of the pulling index (7) is connected to a crimping metal tube (8) and is connected to a hand-adjusting rod (42) via the crimping metal tube (8); The upper portion of the manual adjustment rod is provided with a rough surface (421) that is matched and connected to the crimped metal tube (8).

7. The retractable plasma electrode according to claim 5, characterized in that: The guide hole (41) is provided with 9 limiting grooves (43), and the limiting grooves (43) are arranged in a staggered manner on both sides along the extension direction of the guide hole (41); one side of the guide hole (41) is provided with 4 limiting grooves (43), and the other side is provided with 5 limiting grooves (43); The nine limiting grooves (43) are provided with identification scales (44) numbered 1 to 9, and the limiting grooves (43) are numbered 1 to 9 respectively from a position close to the electrode tip end (1) to a position far from the electrode tip end.

8. The retractable plasma electrode according to claim 1, characterized in that: The material of the insulating tube (2) is one of ceramic, PVDF, PTFE, polyparaxylene, nylon, and compliant high-temperature silicone resin; The material of the metal tube (3) is one of stainless steel, tungsten alloy, titanium alloy, and platinum-iridium alloy.

9. The retractable plasma electrode according to claim 1, characterized in that: The electrode tip (1) is made of a shape memory metal material, and the shape memory metal material is a nickel-titanium alloy.

10. The retractable plasma electrode according to claim 1, characterized in that: The electrode tip (1) is a needle-shaped electrode.

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