Cutting method, intervention structure and application

Abstract

The invention relates to the technical field of medical instruments, in particular to a cutting method, an intervention structure and application, the cutting method comprises the following steps that a shade is installed at a preset position of a to-be-cut piece, and the shade is suitable for completely blocking cutting energy reaching the position so as to prevent the to-be-cut piece below from being cut; or the shade is suitable for blocking part of cutting energy reaching the position so as to prevent the to-be-cut piece below from being cut off; and under the condition that the cutting energy reaching the preset position is uninterrupted, the to-be-cut piece is cut. The cutting method, the intervention structure and the application are low in cost and short in machining time.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a cutting method, an intervention structure and applications. Background Art

[0002] In order to make the tube or plate meet the use requirements, the plate or tube is processed into a specific shape by mechanical cutting or laser cutting, for example, the catheter is cut into a tubular structure with a pattern. At present, intravascular interventional therapy is increasingly popular in the clinic with its advantages of less trauma, faster recovery, no need for surgery, reduced infection, precise treatment, and fewer complications. Intravascular catheter devices are the key to intravascular interventional therapy, which can provide precise positioning, drug delivery, and achieve the diagnosis and treatment of the target intravascular disease. Under current surgical conditions, when the patient's vascular anatomical conditions are more tortuous, catheters with intermediate layers made of metal wire braiding and metal wire winding springs are often selected as the first choice for surgery. Compared with ordinary catheters, these catheters with metal wire reinforced intermediate layers have significantly improved folding resistance, pressure resistance, anti-ovalization performance, and torque transmission performance.

[0003] However, it still has considerable defects. For example, although the performance of the catheter with braiding as the middle layer is improved compared with that of ordinary catheters, it is still not enough to adapt to the complex cases of cerebrovascular diseases. When using braided catheters for cerebrovascular interventional surgery, the catheter often has a significant tendency to ovate, which makes it impossible for other instruments to pass through the catheter; at the same time, when encountering particularly tortuous blood vessels, the catheter is even at risk of breaking. When encountering tortuous lesions, the catheter with a coiled spring as the middle layer is much more resistant to ovation and bending than the braided catheter. However, the main problem is that the overall strength of the catheter is low, and the catheter is prone to breakage and deformation in the blood vessel, especially in the event of vascular spasm, which causes the inner wall of the blood vessel to hug the outer wall of the catheter. Improper operation can easily cause the catheter to break in the blood vessel, causing major medical accidents.

[0004] To solve the above problems, two new types of catheters have been introduced. One is to use braiding and coiling as the middle layer of the catheter at the same time, combining the advantages of the two. This type of catheter has achieved a certain balance between anti-ovalization and anti-bending performance, and is not easy to break, which can be used in most cases. However, due to structural reasons, the braided layer and coiling layer are each combined together by the polymer on the outer layer of the catheter, resulting in a thicker wall thickness of the catheter. At the same time, its torque transmission performance is consistent with that of the braided catheter. When encountering a blood vessel that needs to be bifurcated, it is difficult for the doctor to achieve the effect of transmitting torque to the blood vessel through operation.

[0005] Another catheter design is to abandon the structure of braiding or winding spring as the middle layer and use stainless steel tube as the middle layer of the catheter. The stainless steel tube is engraved with cutting patterns that adapt to the performance of the catheter in the form of laser cutting, and because the middle layer was originally a whole catheter, the torque transmission performance of this type of catheter is significantly better than that of the above-mentioned catheter. Other performances can achieve similar effects by adjusting the laser cutting pattern. However, the processing of this catheter is relatively time-consuming. On the one hand, the cost of the laser cutting machine is relatively high, and the pattern of this catheter is intermittent, which leads to frequent start and stop of the laser during laser cutting, and the frequent start and stop consumes a considerable amount of processing time; on the other hand, most of this type of catheter uses hollow patterns or cutting patterns perpendicular to the axis of the catheter, which leads to the three-axis laser cutting machine. The laser head not only moves unidirectionally relative to the catheter along the axial direction, but also reciprocates between the laser head and the catheter, which will greatly affect the cutting efficiency. In addition, the frequent start and stop of the laser has a greater impact on the life of the equipment, and the overall processing and maintenance costs are high. In general, although the catheter made of this type of hypotube has excellent performance, its processing cost is even 5 times that of braided or spring-wound catheters, resulting in extremely high selling prices for the catheters in hospitals, which imposes a heavy economic burden on patients and the medical system. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the cutting method in the prior art in terms of long processing time and high processing cost, thereby providing a cutting method, an intervention structure and an application with low cost and short processing time.

[0007] In order to solve the above technical problems, the present invention provides a cutting method, comprising the following steps:

[0008] Install a shield at a predetermined position of the workpiece to be cut, wherein the shield is suitable for completely blocking the cutting energy reaching the position to prevent the workpiece to be cut below from being cut; or

[0009] The shield is suitable for blocking part of the cutting energy reaching the position to prevent the workpiece to be cut below from being cut;

[0010] When the cutting energy reaches the predetermined position without interruption, the workpiece to be cut is cut.

[0011] Optionally, the workpiece to be cut is cut by any one of laser cutting, high-pressure water jet cutting, plasma cutting, arc cutting or metal gas cutting.

[0012] Optionally, the width of the laser cut groove is adjusted by adjusting the optical path configuration of the laser and changing the focal size of the laser beam.

[0013] Optionally, the high-pressure water jet cutting uses an abrasive jet method to cut the workpiece.

[0014] Optionally, the abrasive is corundum powder and tungsten steel powder in a mass ratio of 2:1-4:1, the particle sizes of the corundum powder and tungsten steel powder are 0.005mm-0.03mm and 0.008mm-0.05mm respectively, the water pressure of the cutter head is 200MPa-300MPa, and the water jet feed speed is 3mm / s-7mm / s.

[0015] Optionally, the abrasive is corundum powder and tungsten steel powder in a mass ratio of 3:1, the grain size of the corundum powder is 0.01mm, 0.015mm, 0.02mm, 0.025mm or 0.03mm, the grain size of the tungsten steel powder is 0.01mm, 0.02mm, 0.03mm, 0.04mm or 0.05mm, the water pressure of the cutter head is 260MPa, and the water jet feed speed is 5mm / s.

[0016] Optionally, the end of the mask is fixed to the piece to be cut by bonding, welding or clamping.

[0017] Optionally, when the mask is installed with the workpiece to be cut in a winding manner, the winding density or the winding area at the end of the mask is greater than the winding density or the winding area at other positions.

[0018] Optionally, the winding direction of the spiral mask and the spiral cutting direction intersect with each other to form a connecting structure at the intersection position.

[0019] Optionally, the method further includes the step of pickling the cut pieces.

[0020] Optionally, the cut pieces are placed in a mixture of hydrochloric acid and sulfuric acid for pickling.

[0021] Also provided is an intervening structure, which is prepared using the cutting method.

[0022] Optionally, the intervention structure is any one of a catheter, a guidewire or a stent.

[0023] Also provided is an application of the cutting method in the cutting field.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. In the cutting method provided by the present invention, when cutting the workpiece to be cut, since the predetermined position of the workpiece to be cut is covered with a mask, and the mask is suitable for blocking at least part of the cutting energy reaching this position to avoid the workpiece to be cut below being cut or severed, no matter which cutting method is adopted, when cutting to the position where the mask is located, the workpiece to be cut below the mask will not be cut or severed, which is equivalent to the cutting at this position being completely blocked or the cutting energy being weakened, thereby realizing continuous cutting at this position without stopping the machine, shortening the processing time, and reducing the processing cost; and a connecting structure is formed at the position where the mask is located, thereby ensuring the mechanical properties of the workpiece to be cut in terms of transmitting pushing force, torque and bearing pressure and tensile strength.

[0026] 2. The cutting method provided by the present invention adjusts the width of the laser cutting groove by adjusting the optical path configuration of the laser and changing the focal size of the laser beam. The method is simple and easy to implement.

[0027] 3. The cutting method provided by the present invention uses abrasive jet to cut the workpiece in high-pressure water jet cutting. The strong pressure when the water jet is ejected will impact the surface of the workpiece to be cut. Different abrasives are used to increase the cutting ability, which can achieve the effect of grooving the surface of the workpiece to be cut.

[0028] 4. The cutting method provided by the present invention pickles the workpiece after cutting, which can effectively remove the oxidation residue after laser cutting and corrode and loosen the welding points at both ends to ensure the quality of the workpiece to be cut.

[0029] 5. In the cutting method provided by the present invention, the winding direction of the spiral mask and the direction of the spiral cutting intersect each other so that the spiral lines of the two have as many intersections as possible to ensure the overall strength of the piece to be cut after cutting. Compared with the normal connection structure, this spiral connection structure can effectively improve the torque transmission effect and avoid the stress concentration phenomenon caused by the bending of the catheter. This is because in the cutting method provided by the present invention, the material covered by the mask will not be exposed to the laser, that is, it will not be heated by the laser energy during the laser cutting process, avoiding the uncontrollable heat treatment process; while the connection part of the maskless cutting method will be exposed to the laser energy, and the laser energy will passively apply heat treatment (higher than 1000°C) to the material during the processing. Since the heat treatment process is passive, the temperature is uncontrollable and depends entirely on the speed of the laser cutting during the process, resulting in a decrease in the mechanical properties of the material, such as brittleness and reduced toughness. Although it can be properly remedied by annealing or low-temperature tempering, the performance cannot be improved to the level of laser cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the axial direction of the catheter during normal laser cutting under ideal conditions;

[0032] Figure 2 This is a schematic diagram of the catheter axis when the cutting width is uneven due to the start and stop of the laser;

[0033] Figure 3 This is an axial schematic diagram of cutting a catheter using the cutting method provided by the present invention;

[0034] Figure 4 A schematic diagram of a catheter having a spiral shape after cutting a mask using the cutting method provided by the present invention;

[0035] Figure 5 for Figure 4 Schematic diagram after removing the mask;

[0036] Figure 6 It is a schematic diagram when the cutting speed is faster;

[0037] Figure 7 It is a schematic diagram when the cutting speed is slow;

[0038] Figure 8 This is a schematic diagram of cutting when the laser spot is large;

[0039] Fig. 9 A schematic diagram of a conduit having a spiral shape and a hollow cutting mask using the cutting method provided by the present invention;

[0040] Fig.10 for Fig. 9 Schematic diagram after removing the mask;

[0041] Fig.11 A schematic diagram of a steel plate with a cross-shaped mask cut using the cutting method provided by the present invention;

[0042] Fig.12 for Fig.11 Schematic diagram after removing the mask;

[0043] Fig.13 A schematic diagram of a steel plate with a linear mask cut using the cutting method provided by the invention;

[0044] Fig.14 for Fig.13 Schematic diagram after removing the mask.

[0045] Description of reference numerals:

[0046] 1. Catheter; 2. Connecting structure; 3. Mask; 4. Laser cutting machine; 5. Cutting groove; 6. Steel plate. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] The main structure of the catheter is similar to that of a conventional intravascular catheter, which is a three-layer structure: the inner layer of the catheter is made of nylon, polyether ketone, polytetrafluoroethylene, polyoxymethylene, polyether ketone and / or a mixture of the above materials, the middle layer is a stainless steel tube reinforcement structure with a special pattern, and the outer layer is made of polyurethane, polyether ketone, nylon and other high molecular polymers.

[0050] The stainless steel tube in the middle layer of the catheter is processed by a laser cutting machine, and a certain cutting pattern is given to the surface. The pattern penetrates the tube wall of the stainless steel tube, turning the stainless steel tube into a hollow state, such as Figure 1 The shape, density and width of the hollow pattern determine the performance of the catheter, and the purpose of adjusting the catheter hardness can be achieved by adjusting the above parameters.

[0051] Generally, medical catheters similar to those cut by hypotubes have intermittent cutting lines, which makes it impossible for the laser cutting machine used for cutting and grooving to work continuously. The industry often uses 2D drawings drawn by plane drawing software as data input for laser cutting machines. The line segments in the 2D drawings are the travel paths of the laser beams. When the cutting line is discontinuous, the cutting machine will stop outputting the laser beam when it reaches the end of the line segment. When the laser head moves to the end of the next line segment, the laser cutting machine starts and outputs the laser beam to start cutting the next line segment. Because the cutting line is intermittent, the number of cutting line segments may even reach more than 10,000, which means that the laser generator must be started and stopped more than 10,000 times during the processing of a catheter. This frequent start and stop will greatly delay the cutting speed and have an irreversible effect on the laser generator, seriously affecting its lifespan, which is ultimately reflected in the increase in the processing cost of the product. In addition, the power of the laser beam is relatively high when it is suddenly started, and it is easy for the cutting energy at the cutting start point to converge, resulting in uneven cutting seams, such as Figure 2 shown.

[0052] During the use of medical catheters, in addition to the need for the catheter to have a certain degree of anti-bending and pressure resistance, the catheter is also required to have a certain axial pushing force (to ensure that the catheter can reach the lesion location), good torque transmission performance (the direction of the catheter head can be controlled in vitro) and axial tensile strength (to prevent the catheter from breaking and improve safety). Based on this, in addition to the spiral grooves, the reinforcement layer of the spiral cut stainless steel tube also requires an axial connection structure between the spiral grooves. These connection structures can play a role in transmitting pushing force, transmitting torque, and bearing pressure and tension. This is also the purpose of using intermittent cutting lines in ordinary laser cutting catheters. In order to avoid uneven cutting caused by the convergence of cutting energy when the laser beam is suddenly started, such as Figures 3 to 5 As shown, this embodiment provides a cutting method, taking a stainless steel conduit as an example of a piece to be cut, and comprising the following steps:

[0053] Draw continuous cutting drawings, design the location of the connection structure 2 according to the use scenario of the catheter 1, and the selection logic of the connection structure 2 is a single spiral, double spiral, etc. along the axial direction of the catheter 1. According to the drawing logic of the connection structure 2, the connection structure 2 is connected in the form of a single spiral or a double spiral on the cutting drawing. The inherent properties of the spiral are counted, the pitches of different spirals are calculated, and the pitches of the spirals are input into the fully automatic tension-controlled spring winding machine. According to the length X of the drawn connection structure 2, a metal material with a width equal to X and a wavelength of 1040 nanometers to 1070 nanometers and a laser reflectivity greater than 85% is selected, preferably a metal material with a reflectivity greater than 90%, such as gold, silver, and copper flat wires, and a thickness less than or equal to X / 4, preferably a material with a thickness less than or equal to X / 5 is used to make the mask 3.

[0054] The stainless steel conduit 1 to be cut is installed in the spring winding machine, and the spring winding process is performed on the stainless steel conduit 1 to be cut according to the input spring winding pitch. The gold, silver, and copper flat wires at both ends of the stainless steel conduit 1 after the spring winding are fixed to the conduit 1 by gluing or welding, and the installation of the mask 3 on the workpiece to be cut is completed. At this time, the mask is spiral-shaped, such as Figure 4 shown.

[0055] The stainless steel conduit 1 is placed in a laser cutting machine 4 for laser cutting. When laser cutting is performed, it is necessary to ensure that the cutting direction is opposite to the winding direction of the connection structure 2, that is, to form multiple cross units so that the spiral lines of the two have as many intersections as possible. The specific method that can be used is: the length of the connection structure 2 is calculated to be 0.35mm, and a flat copper wire of 0.35mm*0.05mm is used as the spring winding material. The flat copper wire is wound on the stainless steel conduit 1 according to the distribution spiral of the connection structure, and is tightly wound at both ends of the stainless steel conduit 1 (the pitch at the tightly wound part is equal to the wire width of 0.35mm), that is, the winding density or winding area at the end of the mask 3 is greater than the winding density or winding area at the rest of the positions, and the copper wire of the tightly wound part is firmly welded to the conduit 1 using a resistance welding machine, and the excess parts at both ends are cut off. Of course, the copper wire end and the conduit can also be fixed by bonding or clamping, which is not specifically limited here. A rare earth-doped fiber laser cutting machine 4 is used to cut the stainless steel catheter 1. The laser cutting power is 200W, the laser wavelength is 1064 nanometers without considering attenuation, the laser cutting focus is located on the inner wall of the stainless steel catheter, and the spot / focus diameter is 25 microns. When cutting, pay attention to the direction of cutting the spiral line is opposite to the direction of winding the flat copper wire. At this time, the continuous laser beam ablates the surface of the stainless steel catheter 1 and penetrates the tube wall of the stainless steel catheter 1 to form a 25-micron wide cutting groove 5. When the laser beam encounters the position where the flat copper wire is wound, because the laser reflectivity of the copper here increases sharply, the laser cutting energy is blocked, and because the outer surface of the flat copper wire is higher than the outer surface of the stainless steel catheter, the laser cannot converge to the focal position. The laser beam here is covered by the flat copper wire, and the stainless steel catheter 1 below does not form a cutting groove 5. When the laser beam continues to move to the edge of the flat copper wire, the stainless steel catheter 1 here is exposed to the laser beam and the laser cutting groove 5 is re-formed. Due to the obstruction of the flat copper wire, the continuous cutting of the stainless steel catheter 1 is achieved under the premise of uninterrupted laser cutting energy. Of course, the mask 3 can also be made of a material that allows part of the laser to penetrate but does not completely cut off the stainless steel catheter 1. At this time, due to the obstruction of the mask 3, the cutting energy is weakened, thereby ensuring that even if a small amount of laser can reach the surface of the stainless steel catheter 1, only shallow scratches are formed, and it will not be cut off, thereby meeting the use requirements of the stainless steel catheter 1.

[0056] After the cutting is completed, the entire stainless steel conduit 1 is placed in a mixed pickling tank filled with hydrochloric acid and sulfuric acid. Pickling can not only remove the oxidation residue after laser cutting, but also corrode and loosen the welding points at both ends of the conduit 1. After the conduit 1 is removed, the flat copper wire wound on the conduit 1 can be removed with a blade. That is, the processed middle layer of the conduit 1 with intermittent cutting grooves 5 is obtained.

[0057] The cutting pattern of this embodiment is not a hollow pattern in the traditional sense. The reason is that although the hollow pattern can give the catheter good flexibility, the laser beam needs to cut along the pattern boundary during cutting. Therefore, the stainless steel catheter not only rotates itself in the cutting machine during cutting, but also reciprocates along the axial direction of the tube body relative to the laser beam, resulting in a long cutting time. In addition, because the area of ​​the hollow pattern is large, the overall strength of the stainless steel catheter after cutting is significantly reduced. In addition, because the interventional surgery using intravascular catheters requires the position of the catheter to be observed under X-rays. Whether it can be developed and observed under X-rays depends on the density of the catheter, so when the overall density of the catheter is higher, the catheter will be more clearly observed. However, after the hollow pattern of the cut is removed, the overall density of the catheter is reduced, so the hollow cutting pattern will reduce the visualization of the catheter. The cutting pattern used in this embodiment is a linear cutting pattern, and the cutting pattern shown in the cutting drawing is one or several spiral lines rotating around the stainless steel catheter. Because when using laser cutting, the laser beam needs to be focused to increase the cutting energy, and the focus size can be controlled by the optical path control system of the laser cutting machine. Therefore, although the cutting line of the present embodiment is a spiral, a groove having the same size as the focal point will be formed at the part where the cutting line is located after being actually cut, which actually forms an effect similar to a hollow cutting pattern.

[0058] Different from the ordinary cutting along the normal direction of the stainless steel catheter, the cutting line of this embodiment forms a certain angle with the normal direction of the stainless steel catheter, preferably 0.2°-12°. The larger the angle, the larger the pitch, the lower the cutting density, and the higher the strength of the catheter after cutting; the smaller the angle, the smaller the pitch, the higher the cutting density, the lower the strength of the catheter after cutting, the better the softness, and the more suitable it is for the distal end of the catheter.

[0059] In addition, in addition to using the method of changing the angle of the spiral line to control the hardness, this embodiment can also use the method of changing the focal size. When the hardness of the catheter needs to be finely adjusted as a whole, it is time-consuming to adjust the cutting drawing. By adjusting the optical path configuration of the laser cutting machine, the focal size of the laser beam can be adjusted to adjust the width of the laser cutting groove. Although the pitch of the cutting line does not change at this time, the width of the hollow cutting groove on the stainless steel catheter increases, and the flexibility of the catheter is improved.

[0060] like Figure 4 and Figure 5 FIG. 1 is a schematic diagram of a catheter having a mask cut into a spiral shape using the cutting method provided by the present invention. At this time, the winding direction of the spiral mask is opposite to the spiral cutting direction, that is, they cross each other. When the cutting speed is fast, the cutting spacing is wide, such as Figure 6 As shown; when the cutting speed is slow, the cutting spacing is narrower, such as Figure 7 As shown in the figure; when the laser spot is larger, the slit is wider and the catheter is softer, as shown in the figure. Figure 8 shown.

[0061] like Fig. 9 and Fig.10 As shown, it is a schematic diagram of a catheter with a spiral-shaped hollow-cut mask using the cutting method provided by the present invention. At this time, the spiral connection structure formed by the spiral mask and the hollow pattern intersect with each other, ensuring the performance of the catheter after cutting.

[0062] like Fig.11 and Fig.12 As shown, it is a schematic diagram of cutting a steel plate with a cross-shaped mask using the cutting method provided by the present invention. At this time, the piece to be cut is a sheet plate, and high-pressure water jet cutting is adopted. Specifically, single-axis (X) and two-axis (X+Y) water jet cutting machines can be used to make the plane pattern on the sheet. The high-pressure water jet cutting adopts an abrasive jet method to cut the piece to be cut, and uses high-pressure water flow as a physical cutting medium to cut the steel plate 6. At the same time, abrasives of different types and sizes can be matched inside the water flow to increase the cutting ability. The strong pressure when the water flow is ejected will impact the surface of the steel plate 6. Different abrasives can be matched to achieve the effect of grooving the surface of the steel plate 6. The water flow pressure comes from the supercharger, and the water flow is transmitted to the cutting nozzle through the high-pressure pipe connected to the supercharger. However, this cutting method determines that the pressure is preferably constant during cutting. The start and stop of the supercharger is a physical action and cannot be completed in an instant. If the water jet is started and stopped many times, it will have a great impact on the cutting efficiency. At the same time, frequent start and stop of the supercharger may bring great pressure to the high-pressure pipe, resulting in an increase in the maintenance frequency of the cutting machine. In addition, in order to improve cutting efficiency and effect, the water flow of the cutting machine will be used with abrasives. Abrasives require special abrasive valves. Frequent starting and stopping of the supercharger will also have a great impact on the abrasive valve, causing an increase in impurities in the sand valve. At the very least, it will cause "sand breaking" during the cutting process, and at worst, it will damage the abrasive valve.

[0063] Take the mechanical cutting of 5m thick 304 stainless steel plate by water jet cutting machine as an example. Abrasive jet processing is used, the abrasive is corundum powder and tungsten steel powder, the mass mixing ratio is 2:1-4:1, preferably 3:1, the abrasive particle size is 0.005mm-0.03mm and 0.008mm-0.05mm respectively, the corundum powder particle size is preferably 0.01mm, 0.015mm, 0.02mm, 0.025mm or 0.03mm, the tungsten steel powder particle size is preferably 0.01mm, 0.02mm, 0.03mm, 0.04mm or 0.05mm, the cutter head water pressure is 200MPa-300MPa, preferably 260MPa, the water jet feed speed is 3mm / s-7mm / s, preferably 5mm / s. A cross-shaped tungsten steel bar is used as a mask, the size is 2mm*10mm, and the width of the residual material left on the steel plate is 10mm. Tungsten steel bars can also be replaced with bars of other metal alloys.

[0064] like Fig.13 and Fig.14 As shown, it is a schematic diagram of cutting a steel plate with a linear mask using the cutting method provided by the invention. The linear mask is placed in the center of the steel plate, and a water jet cutting machine cuts the steel plate, and a connection structure is formed at the position covered by the linear mask.

[0065] In addition, the workpiece to be cut may be cut by plasma cutting, arc cutting or metal gas cutting, etc., which are not specifically limited here. The metal mask may also be a gold flat wire or a silver flat wire.

[0066] By using the cutting method of the present invention, the cutting pattern of the distal end of the catheter is denser, the cutting angle is closer to 90 degrees, and the cutting pattern of the proximal end of the catheter is looser, and the cutting angle is far from 90 degrees. The cutting drawing of the present invention is also a 2D drawing drawn by plane drawing software, but the cutting line is a continuous cutting line, and one cutting line or several cutting lines can be used to complete the cutting of the entire catheter in an end-to-end manner. The biggest advantage is that during the entire cutting process, the laser cutting machine continuously outputs the laser beam, the processing speed is extremely fast, and the impact on the service life of the equipment is minimal.

[0067] The present application also provides an intervention structure, which is prepared by the cutting method, wherein the intervention structure is any one of a catheter, a guide wire or a stent.

[0068] The present application also provides an application of the cutting method in the cutting field.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A cutting method, characterized in that: The following steps are involved: A shield (3) is installed at a predetermined position of the workpiece to be cut, wherein the shield (3) is suitable for completely blocking the cutting energy reaching the position to prevent the workpiece to be cut below from being cut; or The shield (3) is suitable for blocking part of the cutting energy reaching the position to prevent the workpiece to be cut below from being cut; When the cutting energy reaches the predetermined position without interruption, the workpiece to be cut is cut.

2. The cutting method according to claim 1, characterized in that: The workpiece to be cut is cut by any of laser cutting, high-pressure water jet cutting, plasma cutting, arc cutting or metal gas cutting.

3. The cutting method according to claim 2, characterized in that: By adjusting the optical path configuration of the laser, the focal size of the laser beam is changed to adjust the width of the laser cut groove (5).

4. The cutting method according to claim 2, characterized in that: The high-pressure water jet cutting uses an abrasive jet method to cut the workpiece.

5. The cutting method according to claim 4, characterized in that: The abrasive is corundum powder and tungsten steel powder in a mass ratio of 2:1-4:1, the particle sizes of corundum powder and tungsten steel powder are 0.005mm-0.03mm and 0.008mm-0.05mm respectively, the water pressure of the cutter head is 200MPa-300MPa, and the water jet feed speed is 3mm / s-7mm / s.

6. The cutting method according to claim 5, characterized in that: The abrasive is corundum powder and tungsten steel powder in a mass ratio of 3:1, the particle size of the corundum powder is 0.01mm, 0.015mm, 0.02mm, 0.025mm or 0.03mm, the particle size of the tungsten steel powder is 0.01mm, 0.02mm, 0.03mm, 0.04mm or 0.05mm, the water pressure of the cutter head is 260MPa, and the water jet feed speed is 5mm / s.

7. The cutting method according to claim 1, characterized in that: The end of the mask (3) is fixed to the piece to be cut by bonding, welding or clamping.

8. The cutting method according to claim 7, characterized in that: When the mask (3) is installed with the workpiece to be cut in a winding manner, the winding density or winding area at the end of the mask (3) is greater than the winding density or winding area at other positions.

9. The cutting method according to claim 8, characterized in that: The winding direction of the spiral mask (3) and the spiral cutting direction intersect each other to form a connecting structure (2) at the intersection position.

10. The cutting method according to any one of claims 1 to 9, characterized in that: The method also includes the step of pickling the cut pieces.

11. The cutting method according to claim 10, characterized in that: The cut pieces are placed in a mixture of hydrochloric acid and sulfuric acid for pickling.

12. An intervention structure, characterized in that: The invention is prepared by the cutting method according to any one of claims 1 to 11.

13. The intervention structure according to claim 12, characterized in that: The intervention structure is any one of a catheter, a guide wire or a stent.

14. Use of the cutting method according to any one of claims 1 to 11 in the field of cutting.

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