A medical pressure catheter welding method
By using fine wire and high-voltage gap discharge ignition melting technology, combined with UV adhesive detection, the thermocouple effect and soldering instability problems in medical pressure catheter welding have been solved, achieving high-precision and long-term stable welding results, and reducing measurement errors and long-term drift.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 安能芯数字科技(杭州)有限公司
- Filing Date
- 2024-07-01
- Publication Date
- 2026-07-21
AI Technical Summary
Existing grafting techniques for medical pressure catheters suffer from problems such as thermocouple effects, uneven wire thickness, and unstable soldering operations, resulting in large measurement errors, unstable welding, and difficulty in achieving high precision and long-term stability.
Using fine wires (less than 10µm) and high-voltage gap discharge arcing melting technology, combined with UV glue detection, the wire alignment and welding quality are ensured through precise positioning and high-voltage discharge welding. A push-pull transformer circuit is used to generate high voltage for welding. After UV glue is applied, the breakdown voltage is tested in physiological saline to determine the integrity.
It reduces thermocouple effects, improves machining accuracy and welding stability, reduces long-term drift, and significantly improves measurement accuracy and product quality.
Smart Images
Figure CN118848184B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of welding pressure catheters for human bodies, and particularly to the technical field of welding methods for medical pressure catheters. Background Technology
[0002] In the past, in order to ensure the long-term stability of the device, the human body pressure measurement catheter was generally encapsulated by grafting. This method can significantly reduce long-term drift and can achieve ±2 mmHg within 24 hours.
[0003] Traditional grafting methods use soldering. However, considering the difficulty of soldering and its oxidation effect, silver and copper wires are generally used for grafting. The existing technology has the following problems: 1. The grafting process introduces a third metal, which creates a thermocouple effect. When the conduit enters the human body, the temperature difference will generate a potential difference. This potential difference is superimposed on the original signal, resulting in pressure measurement error. 2. In order to ensure stability, traditional grafting methods generally use an upward bending method for the thick wire. The thick wire introduces a relatively large rebound force. Although it can be treated by annealing, it may still cause interference from the elasticity in pressure measurement. 3. Traditional soldering operations have many problems, and the lack of stable technology can easily lead to problems such as short circuits.
[0004] Therefore, the problems that need to be solved include: 1. Insufficient wire fineness can easily lead to problems such as current dispersion and unevenness, and require a longer time for grafting experiments. It may also cause greater difficulties when bending and twisting. 2. Reduce thermocouple effects, decrease experimental measurement errors, and obtain accurate experimental data; 3. Optimize welding methods to make grafting technology more stable; 4. Optimize the testing method for UV adhesive to make it more rigorous, capable of detecting minute defects, and making the testing more complete.
[0005] Therefore, a method for welding medical pressure catheters is needed to solve the above problems. Summary of the Invention
[0006] The purpose of this invention is to solve the problems in the prior art and propose a method for welding medical pressure catheters. This method can use thinner and more uniform wires to avoid thermocouple effects, reduce thermal damage to materials during processing, and improve processing accuracy, quality, and efficiency. Furthermore, it employs a "high-voltage gap discharge arcing and melting" technique to melt and weld the wires, avoiding the problems associated with traditional soldering.
[0007] To achieve the above objectives, the present invention proposes a method for welding medical pressure catheters, comprising the following steps: Step 1: Data Input: Input the wire diameter, material, and discharge time into the welding equipment. The software control module of the welding equipment calculates the magnitude of the stress torque based on the expression function of the torque and wire diameter. The wire diameter includes thick wire diameter and thin wire diameter, with the thin wire diameter being less than 10µm. Step 2: Thick wire installation: Wrap the thick wire around the anode of the electrode of the welding equipment. Connect one end of the thick wire to the tension device of the welding equipment. The software control module transmits the calculated torque data to the tension device, which applies force to the thick wire so that the thick wire can completely adhere to the electrode. Step 3: Wire installation: Pass the thin wire through the insulated guide needle, leaving enough length at the needle tip to facilitate high-voltage discharge welding; Step 4: Fixing the insulating guide pin: Align the thick wire and the thin wire at the required angle according to actual needs, and use a precision positioning clamp to fix the position of the insulating guide pin to ensure the alignment angle between the thick wire and the thin wire and the discharge gap width between them. Step 5: Fusion Welding: Activate the discharge switch on the welding equipment. The software control module sends a DC signal of a specified length to the input of the amplification circuit of the welding equipment. The DC signal is amplified by the amplification circuit to generate a high-voltage signal with the required amplitude. The length of the DC signal is the discharge duration of the high voltage, i.e., the fusion welding time. Step Six: Grinding the solder joints and applying UV adhesive: After the molten welding is completed, wait for the solder joints to cool down, then grind the solder joints slightly to make them neat, and then apply a layer of UV adhesive on them. Step 7: Quality Testing: Place the product coated with UV adhesive into physiological saline, apply voltage to both ends, and measure and record their breakdown voltage to determine whether the UV adhesive covers the entire product. Products that fail to meet the requirements will be reworked.
[0008] Preferably, the expressions for the torque and wire diameter are as follows: Where Load is the applied force, and the unit of Load is g; D is the wire diameter, and the unit of D is μm; a=-3.31194E-06; b=4.05024E-03; c=-5.52576E-04; d=4.81624E-01.
[0009] Preferably, the welding equipment includes a "wire feeding + tension" module, a welding module, a software control module, an operation console, a discharge system, and an interface display control system. The "wire feeding + tension" module includes a wire feeding device and a tension device, the discharge system includes an amplifier circuit, and the interface display control system includes a display screen.
[0010] Preferably, the tension device includes a tension wheel assembly, a spring pressure wheel assembly, a wire tension unit mounting plate, and a tension unit motor assembly. The tension wheel assembly and the spring pressure wheel assembly are mounted on the wire tension unit mounting plate. The input end of the tension wheel assembly is mechanically connected to the output end of the tension unit motor assembly. Both the tension wheel of the tension wheel assembly and the spring pressure wheel of the spring pressure wheel assembly have thick wires fitted on their outer circumferential surfaces.
[0011] Preferably, the wire feeding device includes a wire feeding unit motor assembly, an electromagnet base, an electromagnet, an armature, a gripper base, and a central gripper. The wire feeding unit motor assembly is fixed to the lower part of the wire tension unit mounting plate of the tension device. An electromagnet base is fixed to the output end of the wire feeding unit motor assembly. An electromagnet is embedded in the lower part of the electromagnet base. An armature is fitted to the top of the electromagnet base. A thick wire is fitted between the top of the electromagnet base and the armature. A gripper base is fixed to the right side of the electromagnet base. Two central grippers are fixed to the top of the gripper base. A thick wire is fitted between the two central grippers. Further, the electromagnet base is inverted L-shaped. A V-shaped groove is provided laterally on the top of the electromagnet base and one side of the central gripper. Several square grooves are provided laterally at equal intervals on the top of the electromagnet base and one side of the central gripper, and are vertically connected to the V-shaped grooves. An armature is fitted to the top of the electromagnet base. The structure of the lower part of the armature matches the structure of the top of the electromagnet base. A circular groove is provided on the top surface of the lower part of the electromagnet base, and an electromagnet is embedded in the circular groove.
[0012] Preferably, the insulating guide pin has a vertical through hole inside, the lower part of the through hole is tapered with a larger top and a smaller bottom, and the end of the through hole has a chamfer with a chamfer angle of 90°; the insulating guide pin is made of insulating material, and there are multiple choices of insulating material, such as ceramic, diamond, etc.
[0013] Preferably, the amplifier circuit is a push-pull transformer circuit.
[0014] Preferably, the welding equipment is encapsulated with a protective gas, and the gas shown is an inert gas.
[0015] The beneficial effects of this invention are: 1. Grafting is performed using fine wires (less than 10µm, such as 9µm), which are never used in existing technologies. Finer wires allow for smaller electrode spacing, higher current density, smaller heat-affected zone, and less residual stress, thereby reducing thermal damage to the material during processing and improving processing accuracy, quality, and efficiency.
[0016] 2. To address the drawback of existing technologies that use different wires for grafting, which can easily lead to thermocouple effects, this technology uses the same wire for grafting. This not only effectively avoids issues such as compatibility between different wires, simplifying the grafting process and improving stability, but also effectively eliminates the thermocouple effect, reduces measurement errors, and significantly improves product accuracy.
[0017] 3. This technology utilizes a "high-voltage gap discharge arcing and melting" technique, which addresses the traditional soldering method used in grafting. A push-pull transformer circuit generates high voltage, which breaks down the air, producing high heat that melts and welds the wires.
[0018] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description
[0019] Figure 1 This is a diagram showing the relationship between the theoretical wire diameter and torque of the tension device in the welding equipment of a medical pressure catheter welding method according to the present invention. Figure 2 This is a diagram showing the relationship between the actual wire diameter and torque of the tension device in the welding equipment of a medical pressure catheter welding method according to the present invention. Figure 3 This is a schematic diagram of Scheme 1 of the medical pressure catheter welding method of the present invention; Figure 4 This is a schematic diagram of Scheme 2 of the medical pressure catheter welding method of the present invention; Figure 5 This is a diagram showing the voltage variation at the weld point in a welding method for a medical pressure catheter according to the present invention. Figure 6 This is a welding effect diagram of a medical pressure catheter welding method according to the present invention; Figure 7 This is a frame diagram of a welding equipment for a medical pressure catheter welding method according to the present invention; Figure 8 This is a three-dimensional view of the "wire delivery + tension" module of a medical pressure catheter welding method of the present invention; Figure 9 This is a front view cross-sectional view of the "wire delivery + tension" module of a medical pressure catheter welding method of the present invention. Figure 10 This is a perspective view of the electromagnet base of a medical pressure catheter welding method according to the present invention. Figure 11 This is a perspective view of the armature in a medical pressure catheter welding method of the present invention; Figure 12 This is a perspective view of the centering jaws of a medical pressure catheter welding method according to the present invention. Figure 13This is a perspective view of the welding module of a medical pressure catheter welding method according to the present invention.
[0020] In the diagram: 1-Tension wheel assembly, 2-Spring pressure wheel assembly, 3-Wire tension unit mounting plate, 4-Tension unit motor assembly, 5-Wire feeding unit motor assembly, 6-Electromagnet base, 7-Electromagnet, 8-Armature, 9-Claw base, 10-Centering claw, 11-Insulated guide pin, 12-Triaxial motor, 13-Welding module base, 14-Welding machine CCD base, 15-Salt water droplet, 16-Miniature CCD, 17-Miniature UV light source, 18-Conductive medium transporter; Figure 3 , Figure 4 In the middle, the upper left is the high-voltage circuit. Detailed Implementation
[0021] See Figures 1-13 The present invention includes the following steps: Step 1: Data input: Input the wire diameter, material, and discharge time into the welding equipment. The software control module of the welding equipment calculates the magnitude of the stress torque based on the expression function of the torque and wire diameter. The wire diameter includes thick wire diameter and thin wire diameter, and the thin wire diameter is less than 10 μm. Step 2: Thick wire installation: Wrap the thick wire around the anode of the electrode of the welding equipment. Connect one end of the thick wire to the tension device of the welding equipment. The software control module transmits the calculated torque data to the tension device, which applies force to the thick wire so that the thick wire can completely adhere to the electrode. Step 3: Wire installation: Pass the thin wire through the insulated guide needle, leaving enough length at the needle tip to facilitate high-voltage discharge welding; Step 4: Fixing the insulating guide pin: Align the thick wire and the thin wire at the required angle according to actual needs, and use a precision positioning clamp to fix the position of the insulating guide pin to ensure the alignment angle between the thick wire and the thin wire and the discharge gap width between them. Step 5: Fusion Welding: Activate the discharge switch on the welding equipment. The software control module sends a DC signal of a specified length to the input of the amplification circuit of the welding equipment. The DC signal is amplified by the amplification circuit to generate a high-voltage signal with the required amplitude. The length of the DC signal is the discharge duration of the high voltage, i.e., the fusion welding time. Step Six: Grinding and UV Glue Coating: After the molten welding is completed, wait for the solder joints to cool down, then grind them slightly to make them neat, and then apply a layer of UV glue on them; UV glue application can be done using commercially available UV glue application equipment, which will automatically apply the glue to the solder joints and allow it to solidify. Step 7: Quality Testing: The existing UV adhesive coating equipment automatically moves to move the wire into the groove of the welding machine CCD base to receive saline droplets. The saline droplets are delivered from the conductive medium transporter, allowing the UV-coated product to enter the saline solution. Voltage is applied to both ends, and their breakdown voltage is measured and recorded to determine whether the UV adhesive coverage is complete. Products that are not up to standard are reworked.
[0022] The working process of this invention: The present invention provides a method for welding medical pressure catheters, which is described in conjunction with the accompanying drawings during operation.
[0023] This patented technology mainly consists of two parts: a high-voltage circuit and a welding device. To better control the transformer's magnetic flux changes and improve the stability and accuracy of the output voltage, resulting in a more stable and reliable high-voltage output, this welding device uses a DC signal as the input signal and amplifies the input signal through a push-pull transformer circuit.
[0024] In the design of the welding apparatus, the copper wire is first stripped and wound onto the electrode. To ensure tight contact between the wire and the anode, a tensioning device is added to provide a certain torque while the thick wire is fixed to the electrode. The torque is related to the wire diameter, and the relationship between the two can be determined based on theoretical reference values. Figure 1 As shown in the figure, the horizontal axis represents the wire diameter in micrometers (µm), and the vertical axis represents the magnitude of the applied force in grams (g).
[0025] Based on the relevant data and formula derivation, the expression for wire diameters within 200µm is obtained as follows:
[0026] (Load is the applied force; D is the wire diameter; a = -3.31194E-06; b = 4.05024E-03; c = -5.52576E-04; d = 4.81624E-01) In actual measurements, the results are obtained based on the measurement data. Figure 2 .
[0027] Considering the possibility of measurement errors, it can be preliminarily determined that the relationship between wire diameter and torque satisfies the above expression.
[0028] In this patented solution, the thick wire is 40µm (AWG=46), and the applied force is 0.06N. Then, an insulating guide pin fixes the thin wire, which continuously approaches the thick wire in a defined direction, ultimately maintaining a tiny gap (the discharge gap is 300-1000µm; this solution uses 700µm), awaiting high-voltage discharge for fusion welding. The following examples illustrate the schematic diagrams of two solutions; Solution 1 is a detailed implementation diagram of this product, attached... Figure 3 As shown, the implementation equipment and principles of this technology are illustrated in detail. The thick and thin wires are horizontally welded. Scheme 2 is a variant of Scheme 1. (See attached image.) Figure 4 As shown, the thick and thin wires are welded perpendicularly at 90°, which overcomes the inapplicability of vertical welding on horizontal or near-horizontal surfaces, and the defects such as uneven flow of welding materials leading to poor weld quality that may occur in vertical welding. The two schemes complement each other, and the choice of scheme can be made according to the actual needs such as the applicable environment and welding purpose.
[0029] Figure 5 The diagram shows the voltage change at the solder joint, illustrating the specific voltage variation during high-voltage discharge from the push-pull transformer circuit. Each soldering operation requires a preheating period before entering a molten state to complete the welding. After the molten welding is complete, the voltage rapidly decreases and the circuit begins to cool.
[0030] Figure 6 The diagram shows the welding results of thick and thin wires under different high-voltage discharge times. When the discharge time is too short, the welding instrument is still in the preheating process and cannot achieve a melting welding effect; while when the discharge time is too long, the weld joint becomes larger and larger, resulting in unsightly welds, wasted space, and increased current leakage. According to actual tests, the optimal effect is achieved by maintaining the discharge time at around 0.65ms.
[0031] 4. Protect solder joints with UV adhesive. Improvements are made to the UV adhesive inspection method, addressing the current widespread use of UV light source inspection (i.e., irradiating with UV light and visually observing for abnormalities to determine the integrity of the UV adhesive coating). The "saltwater voltage breakdown test" method is used: the product coated with UV adhesive is placed in salt water, a high voltage is applied to both ends, and the breakdown voltage is measured to determine if it is within a reasonable range, thus assessing the coating condition.
[0032] Beneficial effects: This patent primarily improves the grafting wire and welding method, eliminating the traditional soldering method and arranging the wires in a more relaxed position, making the grafting process more stable and precise. Through case studies, measurements show that products grafted using this solution can reduce long-term drift to within ±1 mmHg after 24 hours; compared to products using existing solutions, the long-term drift suppression capability is significantly improved, demonstrating remarkable effectiveness.
[0033]
[0034] A method for welding a medical pressure catheter according to the present invention: 1. Input the wire diameter (40um by default for thick wire, 9um by default for thin wire) and material (copper by default) and discharge time into the equipment, and the equipment control center will calculate the magnitude of the stress torque according to the expression function.
[0035] 2. The thick wire is wound around the anode of the electrode. One end of the thick wire is connected to the tension device. The control center transmits the calculated torque data to the tension device, which then applies force to the thick wire so that the thick wire can completely adhere to the electrode.
[0036] 3. Pass the thin wire through the insulated guide needle, leaving enough length at the needle tip to facilitate high-voltage discharge welding.
[0037] 4. Align the thick and thin wires at a specific angle according to actual needs, and use precision positioning clamps to fix the position of the insulating guide pins to ensure the alignment angle between the thick and thin wires and the discharge gap width between them.
[0038] 5. Start the discharge switch. A DC signal of a specified length is transmitted from the control center to the input terminal of the amplifier circuit. The DC signal is amplified by the push-pull transformer circuit to generate a high voltage signal with the required amplitude. The length of the DC signal is the discharge time of the high voltage (i.e., the melting and welding time).
[0039] 6. After welding is completed, wait for the weld to cool down, then grind the weld slightly to make it neat. After that, apply a layer of UV adhesive to strengthen the connection, protect the weld, prevent oxidation, and improve insulation.
[0040] 7. Place the product coated with UV adhesive into physiological saline solution, apply voltage to both ends, and measure and record their breakdown voltage. This is used to determine whether the UV adhesive coverage is complete, and any defective products are reworked. The saline droplet assembly is done in a manner similar to an IV drip. After the wire is detected moving in, a drop of saline solution is dripped from the internal channel (conductive medium transporter) to surround the solder joint. For wiring, one end is on the solder joint, and the other end is on one of the two wires. After the saline solution has subsided, power is applied to test for circuit continuity. Continuity indicates poor UV adhesive application, while no continuity indicates it is good.
[0041] Description of the equipment modules used in this application method: Based on the method of this application, the equipment framework diagram of the welding equipment in actual use is as shown in the attached figure. Figure 7 As shown, it has the advantages of being intelligent and easy to operate.
[0042] The welding equipment mainly consists of six parts: the "wire feeding + tension" module, the welding module, the AI software control module, the overall equipment operation console, the discharge system, and the interface display control system.
[0043] The left and right "wire feeding + tension" modules are used to transmit and fix the thick and thin wires respectively. Each module consists of a wire feeding device and a tensioning device. The wire feeding device comprises a movable fixed roller and a positioning spring, used to fix the wire's transmission path and prevent abnormalities such as wire slippage or knotting. The tensioning device consists of upper and lower parts: an upper mass block and a lower electromagnet. When the equipment starts working, the motor inputs a certain amount of current to the electromagnet, causing it to generate magnetic force that attracts the upper mass block. This causes the mass block to press down under the combined action of gravity and magnetic force, thus fixing the wire in the middle and preventing other forces generated during welding from affecting it and causing unnecessary impact on the welding result. A diagram of the "wire feeding + tension" module can be seen. Figure 8 , Figure 9 .
[0044] Two miniature CCD cameras are used in the welding area to monitor the alignment of the wires on both sides. The monitored data is uploaded to the data processing center (software control module) for verification. The data processing center consists of AI algorithm programs. If the discharge gap and angle between the two ends of the wire do not meet the high-voltage discharge fusion welding standard, the program controls the operation of a three-axis motor to automatically adjust the position to achieve the appropriate distance. A diagram of the welding module can be seen. Figure 13 .
[0045] The discharge system uses a push-pull transformer circuit to generate a stable high voltage for discharge welding. The entire welding equipment is encapsulated and inert gases (argon, helium, etc.) are added to protect the weld, minimizing the negative impact of reactive gases in the atmosphere on the weld seam and further ensuring weld quality and avoiding errors. After encapsulation, an external touchscreen is connected as the overall control panel for the interface display system. The operator can directly control each motor on this panel to adjust the three-axis position, aiming to achieve automation and intelligence in the equipment.
[0046] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.
Claims
1. A method for welding a medical pressure catheter, characterized in that: Includes the following steps: Step 1: Data Input: Input the wire diameter, material, and discharge time into the welding equipment. The software control module of the welding equipment will calculate the magnitude of the stress torque based on the expression function of the torque and wire diameter. The expressions for the torque and wire diameter are as follows: Where Load is the applied force, and the unit of Load is g; D is the wire diameter, and the unit of D is μm; a=-3.31194E-06; b=4.05024E-03; c=-5.52576E-04; d=4.81624E-01; wire diameter includes thick wire diameter and thin wire diameter, and thin wire diameter is less than 10 μm; Step 2: Thick wire installation: Wrap the thick wire around the anode of the electrode of the welding equipment. Connect one end of the thick wire to the tension device of the welding equipment. The software control module transmits the calculated torque data to the tension device, which applies force to the thick wire so that the thick wire can completely adhere to the electrode. Step 3: Wire installation: Pass the thin wire through the insulating guide pin, leaving enough length at the tip of the insulating guide pin to facilitate high-voltage discharge welding; Step 4: Fixing the insulating guide pin: Align the thick wire and the thin wire at the required angle according to actual needs, fix the position of the insulating guide pin, and ensure the alignment angle between the thick wire and the thin wire and the discharge gap width between them. Step 5: Fusion Welding: Activate the discharge switch on the welding equipment. The software control module sends a DC signal of a specified length to the input of the amplification circuit of the welding equipment. The DC signal is amplified by the amplification circuit to generate a high-voltage signal with the required amplitude. The length of the DC signal is the discharge duration of the high voltage, i.e., the fusion welding time. Step Six: Grinding the solder joints and applying UV adhesive: After the molten welding is completed, wait for the solder joints to cool down, then grind the solder joints slightly to make them neat, and then apply a layer of UV adhesive on them. Step 7: Quality Testing: Place the product coated with UV adhesive into physiological saline, apply voltage to both ends, and measure and record their breakdown voltage to determine whether the UV adhesive covers the entire product. Products that fail to meet the requirements will be reworked.
2. The method for welding a medical pressure catheter as described in claim 1, characterized in that: The welding equipment includes a "wire feeding + tension" module, a welding module, a software control module, an operation console, a discharge system, and an interface display control system. The "wire feeding + tension" module includes a wire feeding device and a tension device. The discharge system includes an amplifier circuit. The interface display control system includes a display screen.
3. A method for welding a medical pressure catheter as described in claim 1 or claim 2, characterized in that: The tension device includes a tension wheel assembly (1), a spring pressure wheel assembly (2), a wire tension unit mounting plate (3), and a tension unit motor assembly (4). The tension wheel assembly (1) and the spring pressure wheel assembly (2) are mounted on the wire tension unit mounting plate (3). The input end of the tension wheel assembly (1) is mechanically connected to the output end of the tension unit motor assembly (4). The outer circumference surfaces of the tension wheel of the tension wheel assembly (1) and the spring pressure wheel of the spring pressure wheel assembly (2) are fitted with thick wires.
4. The method for welding a medical pressure catheter as described in claim 2, characterized in that: The wire feeding device includes a wire feeding unit motor assembly (5), an electromagnet base (6), an electromagnet (7), an armature (8), a gripper base (9), and a central gripper (10). The wire feeding unit motor assembly (5) is fixed to the lower part of the wire tension unit mounting plate (3) of the tension device. The output end of the wire feeding unit motor assembly (5) is fixed with an electromagnet base (6). An electromagnet (7) is embedded in the lower part of the electromagnet base (6). An armature (8) is fitted on the top of the electromagnet base (6). A thick wire is fitted between the top of the electromagnet base (6) and the armature (8). A gripper base (9) is fixed on the right side of the electromagnet base (6). Two central grippers (10) are fixed on the top of the gripper base (9). A thick wire is fitted between the two central grippers (10).
5. The method for welding a medical pressure catheter as described in claim 4, characterized in that: The electromagnet base (6) is an inverted L-shape; the top of the electromagnet base (6) and one side of the central clamp (10) are provided with V-shaped grooves in the horizontal direction; the top of the electromagnet base (6) and one side of the central clamp (10) are provided with several square grooves in the horizontal direction that are vertically connected to the V-shaped grooves; the top of the electromagnet base (6) is fitted with an armature (8); the structure of the lower part of the armature (8) matches the structure of the top of the electromagnet base (6); the lower top surface of the electromagnet base (6) is provided with a circular groove, and an electromagnet (7) is embedded in the circular groove.
6. The method for welding a medical pressure catheter as described in claim 1, characterized in that: The insulating guide pin has a vertical through hole inside, the lower part of which is tapered and wider at the top than at the bottom, and the end of the through hole has a chamfer at an angle of 90°; the insulating guide pin is made of insulating material.
7. The method for welding a medical pressure catheter as described in claim 1, characterized in that: The amplifier circuit is a push-pull transformer circuit.
8. The method for welding a medical pressure catheter as described in claim 1, characterized in that: The welding equipment is encapsulated with a protective gas, and the gas shown is an inert gas.