Preparation method and application of coaxial bipolar puncture needle

Abstract

The invention relates to a preparation method and application of a coaxial bipolar puncture needle, belongs to the technical field of medical apparatuses and instruments, and solves the technical problem that a doctor prejudges a puncture path of a puncture needle during a drilling operation or a needle-threading fixation operation. The isolating sleeve plays a role in completely insulating the core shaft and the capillary needle tube, the coaxial bipolar probe is prepared simply and conveniently at low cost by ingeniously utilizing the characteristic of fluidization insulation of polypropylene according to the physical characteristic that polytetrafluoroethylene and polypropylene have different melting points, and the prepared coaxial bipolar probe can be applied to preparation of orthopedic surgery puncture needles, such as puncture needles, puncture needles and the like. When a surgeon performs a drilling operation or a needle-threading fixation operation, the direction of a puncture needle and the puncture angle are pre-judged, the previewing of the puncture process by the surgeon is helped, the success rate of puncture is ensured, and the pain of a patient is relieved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and specifically relates to a preparation method and application of a coaxial bipolar puncture needle. Background Art

[0002] Drilling or pinning refers to the ischemic necrosis of a part of the bone under the articular cartilage, which causes degeneration of the articular cartilage overlying it. As the disease progresses, the necrotic bone and cartilage gradually separate from the adjacent bone and cartilage, forming fragments that fall off as loose bodies. This disease is most common in the knee joint, followed by the elbow, ankle, shoulder, and hip joints. Drilling or pinning is usually performed using a puncture needle.

[0003] When existing doctors perform drilling or pin fixation, if the surgeon misjudges the puncture route, he or she will need to remove the puncture needle and perform the puncture again, which not only increases the patient's pain, but also easily increases the chance of infection and affects postoperative recovery. Summary of the invention

[0004] The main purpose of the present invention is to overcome the deficiencies in the prior art and solve the technical problem of doctors predicting the puncture route of the puncture needle during drilling or needle fixation. The present invention provides a preparation method of a coaxial bipolar puncture needle and an application thereof. The coaxial bipolar puncture needle prepared by the present invention can predict the direction and puncture angle of the puncture needle during drilling or needle fixation, which helps the surgeon to preview the puncture process, ensures the success rate of the puncture, and reduces the patient's pain.

[0005] The present invention is achieved through the following technical solutions: A method for preparing a coaxial bipolar probe comprises the following steps: S1. Raw material selection: select a core shaft, a capillary needle tube, a plugging sleeve, and an isolation sleeve as raw materials for preparing a coaxial bipolar probe, wherein the diameter of the core shaft is equal to the inner diameter of the isolation sleeve, the inner diameter of the capillary needle tube is equal to the outer diameter of the isolation sleeve, the outer diameter of the plugging sleeve is equal to the outer diameter of the isolation sleeve, and the wall thickness of the plugging sleeve is equal to the wall thickness of the isolation sleeve; the core shaft and the capillary needle tube are both made of stainless steel, the plugging sleeve is made of polytetrafluoroethylene (PTFE, melting point 321°C~344°C), and the isolation sleeve is made of polypropylene (PP, melting point 164°C~170°C); S2, raw material cleaning: the mandrel, capillary needle tube, plugging sleeve, and isolation sleeve are cut into predetermined sizes, first washed with clean water, then ultrasonically cleaned with alcohol, and finally taken out and dried for later use; S3, assembling the bipolar probe blank: first, sleeve the isolation sleeve on the middle of the core shaft; then, sleeve the plugging sleeve on the core shaft at the front and rear sides of the isolation sleeve respectively; finally, sleeve the capillary needle tube on the outside of the plugging sleeve and the isolation sleeve to obtain the bipolar probe blank; S4, heating of bipolar probe blank: clamping the bipolar probe blank prepared in step S3 and putting it into a heating furnace, the heating temperature is 190℃~230℃, the insulation time is 5~10min, and after taking it out, let it stand in air to cool to room temperature; during the heating and insulation process of step S4, on the one hand, the blocking sleeve always maintains its initial shape, which can ensure the coaxiality of the capillary needle tube and the core shaft, and is convenient for subsequent processing; on the other hand, since the heating temperature is higher than the melting point of the isolation sleeve, the isolation sleeve is first melted and then cooled, and refilled in the gap between the capillary needle tube and the core shaft, so that after the isolation sleeve is melted, it can not only further adhere the capillary needle tube and the core shaft, but also play the role of "fluidized insulation", which is beneficial to the insulation of the core shaft and the capillary needle tube. Compared with the conventional technical means of using glue for bonding in the prior art, it is more firm, environmentally friendly, and can save costs; S5, bipolar probe blank insulation detection: the capillary needle tube and the mandrel of the bipolar probe blank prepared in step S4 are connected to the positive and negative electrodes of the power supply respectively, and the circuit is detected to see whether it is turned on, that is, whether the capillary needle tube and the mandrel are completely insulated. If the circuit is open, the bipolar probe blank is qualified and the next step of processing is carried out; if the circuit is short-circuited, the bipolar probe blank is sent to the scrap area; S6. Grinding of the bipolar probe blank: Grind one end of the bipolar probe blank that has passed the insulation test in step S5 into a three-pointed or two-pointed shape with an inclination angle of 25° to obtain a coaxial bipolar probe.

[0006] Furthermore, in step S6, the coaxial bipolar probe prepared after grinding is placed in an alcohol solution for ultrasonic cleaning, and then placed in a drying furnace for drying. Then, the detection frequency of the electrical impedance detection equipment is set to 3kHz, and the impedance value of the coaxial bipolar probe is detected by the electrical impedance detection equipment to be ≥100 ohms.

[0007] Furthermore, scale lines and / or numbers are laser engraved on the coaxial bipolar probe that passes the electrical impedance test.

[0008] The coaxial bipolar probe prepared by the preparation method described above is used in the preparation of orthopedic surgical puncture needles.

[0009] Furthermore, the orthopedic surgical puncture needle includes a coaxial bipolar probe and a handle, the handle includes a shell and a cover plate, the cover plate is detachably covered on the upper part of the shell, the coaxial bipolar probe is installed on the lower part of the shell, and the upper end of the coaxial bipolar probe extends into the cavity of the shell; a control switch is arranged on the side wall of the shell, a display module is arranged on the upper surface of the cover plate, a battery module and a current signal detection module are arranged in the cavity of the shell, and the control switch, the battery module, the signal detection module and the display module are electrically connected to the PLC control module respectively; The negative pole of the battery module is electrically connected to the capillary needle tube, the capillary needle tube is connected to the first signal input end of the current signal detection module, the positive pole of the battery module is electrically connected to the core shaft, the core shaft is connected to the second signal input end of the current signal detection module, the current signal detection module transmits the collected signal to the PLC control module, and the PLC control module transmits the current signal to the display module.

[0010] Furthermore, the coaxial bipolar probe is bonded to the shell by glue pouring, and a hammer test is performed after the glue solidifies. The sample that passes the hammer test is assembled with the cover plate, control switch, battery module, signal detection module, display module and PLC control module.

[0011] Furthermore, after the orthopedic surgical puncture needle is assembled, it is sterilized by Co60 nuclear irradiation or ethylene oxide sterilization, and is put into storage after packaging, coding and numbering.

[0012] The beneficial effects of the present invention are: The present invention uses the physical properties of different melting points of polytetrafluoroethylene and polypropylene and cleverly utilizes the "fluidized insulation" feature of polypropylene to simply, conveniently and at low cost to prepare a coaxial bipolar probe. The outer capillary needle tube of the prepared coaxial bipolar probe is completely insulated from the core shaft and can be used to prepare orthopedic surgical puncture needles. The surgeon can predict the direction and puncture angle of the puncture needle when performing drilling or needle fixation, which helps the surgeon to preview the puncture process, ensure the success rate of the puncture and reduce the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main cross-sectional structure of the coaxial bipolar probe; Figure 2 It is a schematic diagram of the main cross-sectional structure of an orthopedic surgical puncture needle; Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at position A in the middle; Figure 4 It is a schematic diagram of the side view structure of an orthopedic surgical puncture needle.

[0014] In the figure, 1 is a coaxial bipolar probe, 1-1 is a core shaft, 1-2 is an isolation sleeve, 1-3 is a blocking sleeve, 1-4 is a capillary needle tube, 2 is a shell, 3 is a cover plate, 4 is a control switch, 5 is a display module, 6 is a battery module, 7 is a current signal detection module, and 8 is a PLC control module. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] A method for preparing a coaxial bipolar probe comprises the following steps: S1. Raw material selection: select a core shaft 1-1, a capillary needle tube 1-4, a plugging sleeve 1-3, and an isolation sleeve 1-2 as raw materials for preparing a coaxial bipolar probe 1, wherein the diameter of the core shaft 1-1 is equal to the inner diameter of the isolation sleeve 1-2, the inner diameter of the capillary needle tube 1-4 is equal to the outer diameter of the isolation sleeve 1-2, the outer diameter of the plugging sleeve 1-3 is equal to the outer diameter of the isolation sleeve 1-2, and the wall thickness of the plugging sleeve 1-3 is equal to the wall thickness of the isolation sleeve 1-2; the core shaft 1-1 and the capillary needle tube 1-4 are both made of stainless steel, the plugging sleeve 1-3 is made of PTFE, and the isolation sleeve 1-2 is made of PP; S2, raw material cleaning: the core shaft 1-1, the capillary needle tube 1-4, the blocking sleeve 1-3, and the isolation sleeve 1-2 are cut into predetermined sizes, first washed with clean water, then ultrasonically cleaned with alcohol, and finally taken out and dried for standby use; S3, assembling the bipolar probe blank: first, sleeve the isolation sleeve 1-2 on the middle of the core shaft 1-1; then, sleeve the plugging sleeve 1-3 on the core shaft 1-1 at the head and tail sides of the isolation sleeve 1-2 respectively; finally, sleeve the capillary needle tube 1-4 on the outside of the plugging sleeve 1-3 and the isolation sleeve 1-2 to obtain the bipolar probe blank; S4, heating the bipolar probe blank: clamping the bipolar probe blank prepared in step S3 and placing it in a heating furnace, heating the blank to a temperature of 190°C to 230°C, keeping the temperature for 5 to 10 minutes, and then taking it out and letting it stand in air to cool to room temperature; S5, bipolar probe blank insulation detection: the capillary needle tube 1-4 and the core shaft 1-1 of the bipolar probe blank prepared in step S4 are connected to the positive and negative electrodes of the power supply respectively, and the circuit is detected to see whether it is turned on, that is, whether the capillary needle tube 1-4 and the core shaft 1-1 are completely insulated. If the circuit is open, the bipolar probe blank is qualified and the next step of processing is carried out; if the circuit is short-circuited, the bipolar probe blank is sent to the scrap area; S6, grinding of bipolar probe blank: grinding one end of the bipolar probe blank that has passed the insulation test in step S5 into a three-pointed or two-pointed shape, with an inclination angle of 25°, to obtain a coaxial bipolar probe 1, whose main cross-sectional structure is as follows: Figure 1 shown.

[0017] Regarding the grinding instructions for triangular or bi-angular points, it is necessary to understand the grinding characteristics of stainless steel, the selection of grinding wheels, and the adjustment of grinding processing parameters: 1. Characteristics of grinding stainless steel: Stainless steel has high toughness and thermal strength, while the cutting edge of the grinding wheel abrasive has a large negative rake angle. During the grinding process, the grinding chips are not easy to be cut off, the cutting resistance is large, and the extrusion and friction are severe. The grinding force per unit area is very large, and the grinding temperature can reach 1000C-1500C. At the same time, under the action of high temperature and high pressure, the grinding chips are easy to adhere to the grinding wheel, filling the gaps between the abrasive particles, making the abrasive particles lose their cutting effect. Different types of stainless steel will cause different situations of grinding wheel blockage. For example, when grinding concentrated nitric acid resistant stainless steel and heat-resistant stainless steel, the adhesion and blockage phenomenon is more serious than 1Cr18NiTi, while martensitic stainless steels such as 1Cr13 and 2Cr13 are relatively light. The thermal conductivity of stainless steel is small, and the high temperature during grinding is not easy to be discharged. The surface of the workpiece is prone to burns and annealing. The depth of the annealing layer can sometimes reach 0.01~0.02mm. Severe extrusion deformation occurs during the grinding process, resulting in work hardening of the grinding surface. Especially when grinding austenitic stainless steel, due to the unstable austenitic structure, martensitic structure is easy to be generated after grinding, causing serious surface hardening. Stainless steel has a large linear expansion coefficient and is prone to deformation under the action of grinding heat, and its size is difficult to control. This phenomenon is more serious, especially for thin-walled and slender parts. Most types of stainless steel cannot be magnetized. When grinding on the surface, the workpiece can only be clamped by mechanical clamping or special clamps, and the workpiece is clamped by the side of the workpiece, which causes deformation and shape or size errors. 2. How to choose grinding wheel when grinding stainless steel Abrasives: White corundum has good cutting performance and self-sharpening properties, and is suitable for grinding martensite and martensite + ferrite stainless steel; single crystal corundum abrasives are suitable for grinding austenite and austenite + ferrite stainless steel; microcrystalline corundum abrasives are composed of many tiny crystals, with high strength, toughness and good self-sharpening properties. Its self-sharpening characteristics are that it breaks along the gaps of microcrystals, thereby obtaining micro-edge properties and micro-edge properties, which can reduce burns, hair pulling and other phenomena, and can reduce the grinding surface roughness, and is suitable for grinding various stainless steels; cubic boron nitride abrasives have high hardness, good thermal stability, high chemical inertness, and will not oxidize at 1300C and 1500r. The tip of the abrasive is not easy to become blunt and generates less grinding heat, which is suitable for grinding various stainless steels. In order to reduce adhesion, grinding wheels with silicon carbide and artificial diamond as abrasives can also be used. Grain size: When grinding stainless steel, it is generally appropriate to use a medium-grained grinding wheel of No. 36, No. 46, or No. 60. For rough grinding, use No. 36 or No. 46, and for fine grinding, use No. 60. In order to be suitable for both rough and fine grinding, use No. 46 or No. 60; Binder: Grinding stainless steel requires a grinding wheel with high strength to withstand large impact loads. Vitrified binder is heat-resistant and corrosion-resistant. Grinding wheels made of it can maintain cutting performance well, are not afraid of moisture, and have RENRENDOC.COMKE porosity. They are suitable for making binders for grinding stainless steel grinding wheels. When grinding the inner holes of materials such as stainless steel resistant to concentrated nitric acid, resin binders can be used to make grinding wheels; Hardness: A grinding wheel with a lower hardness should be used to improve self-sharpening. Generally, a grinding wheel with a hardness of SN is used, among which K-L is the most commonly used. For internal grinding wheels using microcrystalline corundum as abrasive, a hardness of J is appropriate. Organization: In order to avoid grinding wheel clogging during grinding, the grinding wheel organization should be loose, generally No. 5 and No. 8 are more suitable; 3. Determine the grinding amount during grinding The speed of the ceramic bond grinding wheel is 30~35m / s, and the speed of the resin bond grinding wheel is 35~50m / s. When surface burns are found, the grinding wheel speed should be reduced to 1620m / s. Workpiece speed, when the workpiece diameter is less than 50mm, n=120~150r / min; when it is greater than 50mm, n=40~80r / min. When the outer circle of the grinding wheel is used for plane fine grinding, the worktable movement speed is generally 15~20m / min and 5~50m / min for rough grinding. When the grinding depth and lateral feed are small, take the larger value, and when the lateral feed is large, take the smaller value. The rough grinding depth is 0.04~0.08mm, and the fine grinding depth is 0.01mm. The grinding depth should be reduced after dressing the grinding wheel; The longitudinal feed rate for external cylindrical grinding is (0.2~0.7) Bmm / r for rough grinding and (0.2~0.3) Bmm / r for fine grinding; the longitudinal feed rate for internal cylindrical grinding is (0.4~0.7) Bmm / r for rough grinding and (0.25~0.4) Bmm / r for fine grinding; the transverse feed rate for external cylindrical surface grinding of the grinding wheel is (0.3~0.7) Bmm / dst for rough grinding and (0.05~0.1) Bmm / dst for fine grinding; The grinding wheel should be dressed in time. The grinding wheel should be dressed coarser during rough grinding and kept sharp during fine grinding to avoid overheating and burns. No burrs are allowed at the corners on both sides of the dressed grinding wheel. When grinding low surface roughness, coarse grinding and fine grinding should be carried out separately. Generally, 0.05mm is appropriate for fine grinding. When the workpiece clamping error is large, 0.1mm can be left. 4. Grinding precautions The grinding process must be fully cooled to remove a large amount of grinding heat and flush to prevent the grinding wheel from clogging and the workpiece surface from burning. The coolant must be clean and cannot be mixed with grinding chips or sand particles to avoid roughening the workpiece. The coolant for grinding stainless steel is generally an emulsion with good cooling performance, or a coolant containing extreme pressure additives and low surface tension. The flow rate is 20~40L / min, and 80L / min when the grinding wheel diameter is large; The grinding allowance should be smaller. When grinding the outer circle, the grinding allowance on the diameter is 0.15~0.3mm, and the fine grinding allowance is 0.05mm. The allowance for inner circle grinding is basically the same as that for outer circle grinding. When grinding the surface, for parts with small area and good rigidity, the single-side allowance is 0.15~0.2mm, and for parts with poor rigidity and large area, the single-side grinding allowance is 0.25~0.3mm. Through the understanding of stainless steel grinding, reasonable grinding wheels and grinding parameters are customized, and the coaxial bipolar probe 1 triangular or biangular tip is ground by rough grinding, fine grinding and deburring.

[0018] Furthermore, in step S6, the coaxial bipolar probe 1 prepared after grinding is placed in an alcohol solution for ultrasonic cleaning, and then placed in a drying furnace for drying. Then, the detection frequency of the electrical impedance detection equipment is set to 3kHz, and the impedance value of the coaxial bipolar probe 1 is detected by the electrical impedance detection equipment to be ≥100 ohms.

[0019] Furthermore, laser engraving of scale lines and / or numbers on the coaxial bipolar probe 1 that has passed the electrical impedance test facilitates the doctor to observe the puncture depth and to arrange and operate the surgical site in a reasonable manner.

[0020] The application of the coaxial bipolar probe prepared by the preparation method as described above in the preparation of orthopedic surgical puncture needles, such as Figures 2 to 4 As shown, the orthopedic surgical puncture needle includes a coaxial bipolar probe 1 and a handle, the handle includes a shell 2 and a cover plate 3, the cover plate 3 is detachably covered on the top of the shell 2, the coaxial bipolar probe 1 is installed below the shell 2, and the upper end of the coaxial bipolar probe 1 extends into the cavity of the shell 2; a control switch 4 is arranged on the side wall of the shell 2, a display module 5 is arranged on the upper surface of the cover plate 3, a battery module 6 and a current signal detection module 7 are arranged in the cavity of the shell 1, and the control switch 4, the battery module 6, the signal detection module 7 and the display module 5 are electrically connected to the PLC control module 8 respectively; The negative pole of the battery module 6 is electrically connected to the capillary needle tube 1-4, the capillary needle tube 1-4 is connected to the first signal input end of the current signal detection module 7, the positive pole of the battery module 6 is electrically connected to the core shaft 1-1, the core shaft 1-1 is connected to the second signal input end of the current signal detection module 7, the current signal detection module 7 transmits the collected signal to the PLC control module, and the PLC control module transmits the current signal to the display module 5.

[0021] Furthermore, the coaxial bipolar probe 1 and the shell 2 are bonded by glue pouring, and a hammer test is performed after the glue solidifies (to test whether the probe and the handle shell can fall off and separate after hammering). The sample that passes the hammer test is assembled with the cover plate 3, the control switch 4, the battery module 6, the signal detection module 7, the display module 5 and the PLC control module 8.

[0022] Furthermore, after the orthopedic surgical puncture needle is assembled, it is sterilized by Co60 nuclear irradiation or ethylene oxide sterilization, and is put into storage after packaging, coding and numbering.

[0023] When using an orthopedic surgical needle for drilling or pin fixation: S1, turn on the control switch 4. Since the mandrel 1-1 is insulated from the capillary tube 1-4, the circuit is in an open circuit state, and no parameters are displayed on the display module 5; S2, as the drilling or pin fixation is performed, the puncture needle contacts the skin, the core shaft 1-1 and the capillary tube 1-4 are connected through the skin, the signal detection module 7 receives the current detection signals from the core shaft 1-1 and the capillary tube 1-4 respectively, and the initial parameters are displayed on the display module 5; S3, the surgeon moves the needle according to the predetermined puncture angle and puncture path. When the parameters displayed on the display module 5 change, it proves that the contact parts of the core shaft 1-1 and the capillary needle tube 1-4 with the body have changed, indicating that the puncture path has deviated. The surgeon needs to adjust the puncture angle until the parameters displayed on the display module 5 return to the initial parameters, and then continue the puncture. S4, repeat step S3, adjust the puncture angle and puncture path in real time, until the coaxial bipolar probe 1 can be clearly felt to touch the hard bone tissue, and then continue the subsequent operation to complete the drilling or pinning fixation.

[0024] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for preparing a coaxial bipolar probe, characterized in that: The following steps are involved: S1. Selection of raw materials: a core shaft (1-1), a capillary needle tube (1-4), a plugging sleeve (1-3), and an isolation sleeve (1-2) are selected as raw materials for preparing a coaxial bipolar probe (1), wherein the diameter of the core shaft (1-1) is equal to the inner diameter of the isolation sleeve (1-2), the inner diameter of the capillary needle tube (1-4) is equal to the outer diameter of the isolation sleeve (1-2), the outer diameter of the plugging sleeve (1-3) is equal to the outer diameter of the isolation sleeve (1-2), and the wall thickness of the plugging sleeve (1-3) is equal to the wall thickness of the isolation sleeve (1-2); the core shaft (1-1) and the capillary needle tube (1-4) are both made of stainless steel, the plugging sleeve (1-3) is made of polytetrafluoroethylene, and the isolation sleeve (1-2) is made of polypropylene; S2, raw material cleaning: the core shaft (1-1), the capillary needle tube (1-4), the plugging sleeve (1-3), and the isolation sleeve (1-2) are cut into predetermined sizes, firstly cleaned with clean water, then ultrasonically cleaned with alcohol, and finally the raw materials are taken out and dried for later use; S3, assembling the bipolar probe blank: first, sleeve the isolation sleeve (1-2) on the middle of the core shaft (1-1); then, sleeve the blocking sleeve (1-3) on the core shaft (1-1) at the front and rear sides of the isolation sleeve (1-2); finally, sleeve the capillary needle tube (1-4) on the outside of the blocking sleeve (1-3) and the isolation sleeve (1-2), so as to obtain the bipolar probe blank; S4, heating the bipolar probe blank: clamping the bipolar probe blank prepared in step S3 and placing it in a heating furnace, heating the blank to a temperature of 190°C to 230°C, keeping the temperature for 5 to 10 minutes, and then taking it out and letting it stand in air to cool to room temperature; S5, bipolar probe blank insulation detection: the capillary needle tube (1-4) and the core shaft (1-1) of the bipolar probe blank prepared in step S4 are connected to the positive and negative electrodes of the power supply respectively, and the circuit is detected to see whether it is turned on, that is, whether the capillary needle tube (1-4) and the core shaft (1-1) are completely insulated. If the circuit is open, the bipolar probe blank is qualified and the next step of processing is carried out; if the circuit is short, the bipolar probe blank is sent to the waste area; S6. Grinding of the bipolar probe blank: Grind one end of the bipolar probe blank that has passed the insulation test in step S5 into a three-pointed or two-pointed shape, with the inclination angle of the tip being 25°, to obtain a coaxial bipolar probe (1).

2. The method for preparing a coaxial bipolar probe according to claim 1, characterized in that: In step S6, the coaxial bipolar probe (1) prepared after grinding is placed in an alcohol solution for ultrasonic cleaning, and then placed in a drying furnace for drying. Then, the detection frequency of the electrical impedance detection device is set to 3 kHz, and the impedance value of the coaxial bipolar probe (1) is detected by the electrical impedance detection device to be ≥100 ohms.

3. The method for preparing a coaxial bipolar probe according to claim 2, characterized in that: Laser engrave scale lines and / or numbers on a coaxial bipolar probe (1) that has passed the electrical impedance test.

4. Use of the coaxial bipolar probe (1) prepared by the preparation method according to claim 1 in the preparation of orthopedic surgical puncture needles.

5. The use according to claim 4, characterized in that: The orthopedic surgical puncture needle comprises a coaxial bipolar probe (1) and a handle, the handle comprising a shell (2) and a cover plate (3), the cover plate (3) being detachably covered on the upper side of the shell (2), the coaxial bipolar probe (1) being mounted on the lower side of the shell (2), the upper end of the coaxial bipolar probe (1) extending into the cavity of the shell (2); a control switch (4) being arranged on the side wall of the shell (2), a display module (5) being arranged on the upper surface of the cover plate (3), a battery module (6) and a current signal detection module (7) being arranged in the cavity of the shell (1), the control switch (4), the battery module (6), the signal detection module (7) and the display module (5) being electrically connected to a PLC control module (8) respectively; The negative electrode of the battery module (6) is electrically connected to the capillary needle tube (1-4), the capillary needle tube (1-4) is connected to the first signal input end of the current signal detection module (7), the positive electrode of the battery module (6) is electrically connected to the core shaft (1-1), the core shaft (1-1) is connected to the second signal input end of the current signal detection module (7), the current signal detection module (7) transmits the collected signal to the PLC control module, and the PLC control module transmits the current signal to the display module (5).

6. The use according to claim 5, characterized in that: The coaxial bipolar probe (1) and the housing (2) are bonded by glue pouring, and a hammer test is performed after the glue solidifies. The sample that passes the hammer test is assembled with the cover plate (3), the control switch (4), the battery module (6), the signal detection module (7), the display module (5) and the PLC control module (8).

7. The use according to claim 6, characterized in that: After the orthopedic surgical puncture needle is assembled, it is sterilized by Co60 nuclear irradiation or ethylene oxide sterilization, and then put into storage after packaging, coding and numbering.

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