A medical catheter laser drilling apparatus that reduces thermal distortion of materials

Abstract

The application relates to the field of medical catheter punching, and discloses a medical catheter laser punching equipment capable of reducing material thermal deformation, which comprises a gas feeding assembly arranged in the equipment body, the gas feeding assembly comprises a mounting cylinder, a gas chamber, a connecting pipe, a through rod and a gas nozzle, the inside of the mounting cylinder is provided with the gas chamber, the inside of the mounting cylinder is provided with the connecting pipe, the inside of the connecting pipe is slidably provided with the through rod, and one end of the connecting pipe is fixedly provided with the gas nozzle. The gas feeding assembly provided by the application has the functions of internal and external synchronous gas feeding. When the catheter is punched by laser, the gas feeding assembly can blow inert gas (such as nitrogen) into the catheter and form a gas protection layer on the outer wall of the catheter at the same time, oxygen is effectively isolated, oxidation and carbonization of the hole edge are prevented, and the molten material is timely taken away through internal airflow, so that the recasting layer and burr generation are obviously reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of medical catheter punching, and particularly relates to a medical catheter laser punching device capable of reducing material thermal deformation. BACKGROUND

[0002] In the field of medical catheter micro-hole processing, laser processing technology (especially ultraviolet picosecond and femtosecond lasers) has become a mainstream process due to its high precision and non-contact processing characteristics. Compared with the traditional mechanical drilling process, the laser processing technology can effectively avoid the problems of drill bit wear and frequent replacement, and significantly optimize the processing efficiency and stability. In the prior art, in order to realize high-precision laser punching of the catheter, the accurate spatial position of the catheter is usually obtained through a visual module, and then the preset processing drawing is associated with the actual position of the catheter through an image processor, and finally the laser beam is emitted by a control system to complete the processing. This method greatly improves the automation degree and position precision of the processing. In order to reduce the thermal influence in the processing process, the prior art usually adopts an ultrashort pulse laser, which reduces the heat input by means of extremely short pulse action time, thereby reducing the melting and deformation of the material to a certain extent and ensuring the structural integrity and use performance of the processed medical catheter.

[0003] In the patent application with the application publication number CN119175478B, a punching platform is provided, the top of the punching platform is fixed with a feeding limiting pipe for limiting the catheter, one end of the feeding limiting pipe is provided with a semicircular arc part, and the catheter is in contact with the inner wall of the feeding limiting pipe and the inner wall of the semicircular arc part. A cylindrical support rod for supporting the inner wall of the catheter is placed in the feeding limiting pipe, one end of the cylindrical support rod is fixed with a magnet, an installation groove is arranged in the punching platform, a power coil is installed in the installation groove and matched with the magnet, a driving shaft and a driven shaft are rotationally connected in the punching platform, a driving cam and a driven cam are respectively fixed on the driving shaft and the driven shaft, arc-shaped grooves for extruding the catheter are arranged on the side walls of the driving cam and the driven cam, a driving device for driving the driving shaft and the driven shaft to rotate is installed at the bottom of the punching platform, and a punching device is installed at the top of the punching platform. The advantages are that the cooperation of the driving cam, the driven cam and the driving device realizes periodic operation of the catheter conveying and punching, so that the whole process is more orderly and efficient. The magnet and the cylindrical support rod are arranged to support the catheter, which not only facilitates periodic feeding and realizes equidistant punching, but also makes the punching precision more accurate. The contact switch is arranged to automatically control the start of the laser punching assembly.

[0004] In the prior art including the above-mentioned patent, firstly, the heat-affected and oxidation problems have not been completely solved, although the ultra-short pulse laser is named "cold processing", when high-density and multi-hole processing is performed on the polymer material sensitive to temperature such as a medical catheter, the cumulative effect of heat still exists, and the temperature rise in the processing area may cause irreversible thermal deformation of the material, and more critically, the existing processing is usually performed in an air environment, and the material is easy to be oxidized with oxygen in the air at high temperature, which causes the hole edge to be yellow and carbonized, which not only affects the appearance, but also may introduce the risk of biocompatibility;

[0005] Secondly, the molten material removal capability is insufficient. The molten material generated during the laser drilling process cannot be effectively removed, and is easy to re-attach and solidify on the hole or catheter inner wall to form so-called "recast layer" and burr. These residues change the geometry and size of the hole, and a smooth hole wall is crucial to ensure fluid performance. For example, in a blood vessel catheter, uneven hole edges may increase the resistance of blood flow or cause turbulence;

[0006] Finally, the existing gas protection means is costly. Some technical solutions use the method of processing in an inert gas environment to isolate oxygen. However, this method requires long-time and large-flow gas replacement of the entire processing cavity, which consumes a large amount of nitrogen gas and has high operating costs, making it difficult to adapt to the needs of high-efficiency continuous automatic production. SUMMARY

[0007] The problems to be solved by the present application are: material thermal deformation and micro-crack problems caused by heat input; hole edge oxidation and carbonization problems caused by processing in air; recast layer and burr problems caused by incomplete removal of molten material; and the problem of high gas consumption and high cost of traditional whole inert gas protection.

[0008] To solve the above technical problems, the technical scheme of the present application is: a medical catheter laser drilling device for reducing material thermal deformation, comprising a gas feeding assembly arranged in the device body, characterized in that: the gas feeding assembly comprises a mounting cylinder, a gas chamber, a connecting pipe, a through bar and a gas nozzle, the inside of the mounting cylinder is provided with a gas chamber, the inside of the mounting cylinder is provided with a connecting pipe, the inside of the connecting pipe is slidably provided with a through bar, and one end of the connecting pipe is fixedly provided with a gas nozzle;

[0009] The inside of the device body is provided with a mounting base, the upper ends of the two sides of the mounting base are provided with clamps, the clamps are used for clamping the catheter, and the outer sides of the clamps are provided with gas feeding assemblies;

[0010] The inside of the connecting pipe is fixedly provided with a spring at the end away from the gas chamber, the end of the spring close to the gas chamber is fixedly provided with a magnet, and the magnet is used for fixing the through bar;

[0011] The end of the connecting pipe close to the spring is provided with a through hole for connecting the air pipe, the through bar is made of metal, the through bar is in clearance fit with the connecting pipe, and the inner diameter of the connecting pipe is consistent with the inner diameter of the air nozzle; preferably, the side of the air nozzle connected with the connecting pipe is provided with a square hole, a flow guide block is arranged between the connecting position of the connecting pipe and the air nozzle, and the flow guide block is fixedly connected with the connecting pipe;

[0012] Two air channels are arranged in the flow guide block, the air channels in the flow guide block can send the gas in the air chamber to the air nozzle and the mounting cylinder respectively, the gas sent to the air nozzle in the flow guide block directly enters the air nozzle, and the gas sent to the mounting cylinder in the flow guide block is discharged through the square hole.

[0013] Preferably, the end of the connecting pipe is located at the end of the mounting cylinder close to the clamp, the air chamber is located outside the end of the connecting pipe, the connecting pipe and the air nozzle are connected through bolts, and the air chamber is connected with the external air pipe through two pipelines.

[0014] Preferably, the air feeding assembly further comprises slide rails, the slide rails are arranged on one side of the clamp, the slide rails are provided with two, a mounting plate is arranged between the slide rails, slide sleeves connected with the slide rails are arranged at the upper and lower ends of the mounting plate, a mounting seat is arranged in the middle of the mounting plate, and the mounting seat is internally and slidably provided with the mounting cylinder.

[0015] Preferably, slide grooves are arranged at the two sides of the mounting seat, the slide grooves are used for cooperating with the mounting cylinder to be fixed, and two bolts are arranged at the two sides of the mounting cylinder and enter the slide grooves after being screwed in.

[0016] Preferably, a ventilation opening is arranged at the end of the mounting cylinder close to the air nozzle, and the ventilation opening of the mounting cylinder is arranged around the air nozzle.

[0017] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0018] (1) The air feeding assembly with the internal and external synchronous air feeding function is arranged, when the catheter is laser drilled, the inert gas (such as nitrogen) can be blown into the catheter at the same time, and a gas protection layer is formed on the outer wall of the catheter, so that oxygen is effectively isolated, oxidation and carbonization of the hole edge are prevented, the molten material is timely taken away by the internal airflow, the recast layer and burr generation are significantly reduced, and the hole wall quality and machining precision are improved; the air feeding structure is modularized and adjustable, the position of the air nozzle can be flexibly adjusted through the cooperation of the slide rails, the mounting plate and the slidable mounting cylinder, the air feeding structure is suitable for catheter machining of different lengths and pipe diameters, the replaceable connecting pipe and air nozzle are matched, the universality and adaptability of the equipment are enhanced, and the equipment is convenient to maintain and replace;

[0019] (2) The present application sets up the through bar structure with spring and magnet in the connecting pipe, can detect the patency of the catheter before processing, the through bar is penetrated into the catheter under the action of air pressure, can be recovered by the magnet after detection, realizes the rapid judgment and self-recovery of the catheter state before processing, improves the reliability and automation degree of the system;Two kinds of air ducts are set up in the flow guide block, realize the intelligent shunting of the gas in the air chamber, one way is directly blown into the catheter for slagging and atmosphere protection, the other way is blown out from the air curtain of the outer wall through the installation cylinder from the air nozzle, the inside and outside cooperate, effectively control the heat affected zone, greatly reduce the consumption of inert gas, save the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall three-dimensional structure schematic diagram of the present application;

[0021] Figure 2 It is the internal structure schematic diagram of the present application equipment;

[0022] Figure 3 It is the installation base structure schematic diagram of the present application;

[0023] Figure 4 It is the installation base structure schematic diagram of the present application;

[0024] Figure 5 It is the cross section structure schematic diagram of the present application clamp and gas feeding assembly;

[0025] Figure 6 It is the gas feeding assembly structure schematic diagram of the present application;

[0026] Figure 7 It is the cross section structure schematic diagram of the installation cylinder in the present application gas feeding assembly;

[0027] Figure 8 It is the internal structure schematic diagram of the present application connecting pipe;

[0028] Figure 9 It is the flow guide block structure schematic diagram of the present application.

[0029] In the figure: 1, equipment body;2, installation base;3, clamp;4, gas feeding assembly;401, sliding rail;402, mounting plate;403, mounting seat;404, installation cylinder;405, sliding groove;406, air chamber;407, connecting pipe;4071, spring;4072, magnet;4073, through bar;408, air nozzle;4081, square hole;409, flow guide block. DETAILED DESCRIPTION

[0030] So that the purposes, technical solutions and advantages of the embodiments of the present disclosure are more apparent, the following will describe the technical solutions of the embodiments of the present disclosure in connection with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, but not all the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present disclosure.

[0031] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "comprise" or "include" and the like in the present disclosure mean that the elements or objects before the word encompass the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and the like do not mean only physical or mechanical connection, but also include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0032] As shown in Figures 1 to 9 The present application provides a medical catheter laser drilling device for reducing thermal deformation of materials, which comprises a gas feeding assembly 4 arranged in a device body 1, and is characterized in that the gas feeding assembly 4 comprises a mounting cylinder 404, a gas chamber 406, a connecting pipe 407, a through rod 4073 and a gas nozzle 408, the inside of the mounting cylinder 404 is provided with the gas chamber 406, the inside of the mounting cylinder 404 is provided with the connecting pipe 407, the inside of the connecting pipe 407 is slidably provided with the through rod 4073, and one end of the connecting pipe 407 is fixedly provided with the gas nozzle 408;

[0033] The inside of the device body 1 is provided with a mounting base 2, and the upper ends of the mounting base 2 are provided with clamps 3 on both sides, the clamps 3 are used for clamping catheters, and the outer sides of the clamps 3 are provided with the gas feeding assemblies 4;

[0034] One end of the connecting pipe 407 away from the gas chamber 406 is fixedly provided with a spring 4071, the spring 4071 is fixedly provided with a magnet 4072 close to the gas chamber 406, and the magnet 4072 is used for fixing the through rod 4073;

[0035] One end of the connecting pipe 407 close to the spring 4071 is provided with a through hole for connecting the gas pipe, the through rod 4073 is made of metal, the through rod 4073 and the connecting pipe 407 adopt gap fit, and the inner diameter of the connecting pipe 407 is consistent with the inner diameter of the gas nozzle 408;

[0036] The side, where the connecting pipe 407 is connected with the air nozzle 408, is provided with a square hole 4081, and a flow guide block 409 is arranged between the connecting pipe 407 and the air nozzle 408;

[0037] Two air ducts are arranged in the flow guide block 409, and the air ducts in the flow guide block 409 can respectively send the gas in the air chamber 406 to the air nozzle 408 and the mounting cylinder 404, the gas sent to the air nozzle 408 in the flow guide block 409 directly enters the air nozzle 408, and the gas sent to the mounting cylinder 404 in the flow guide block 409 is discharged through the square hole 4081.

[0038] The end of the connecting pipe 407 is located at one end of the mounting cylinder 404 close to the clamp 3, the air chamber 406 is located outside the end of the connecting pipe 407, the connecting pipe 407 and the air nozzle 408 are connected through bolts, and the air chamber 406 is connected with an external air pipe through two pipelines.

[0039] The air feeding assembly 4 further comprises slide rails 401, the slide rails 401 are arranged on one side of the clamp 3, the slide rails 401 are provided with two, a mounting plate 402 is arranged between the slide rails 401, slide sleeves connected with the slide rails 401 are arranged at the upper and lower ends of the mounting plate 402, a mounting seat 403 is arranged in the middle of the mounting plate 402, the mounting cylinder 404 is slidably arranged in the mounting seat 403, and the mounting seat 403 is used for fixing the mounting cylinder 404.

[0040] Slide grooves 405 are arranged on both sides of the mounting seat 403, the slide grooves 405 are used for cooperation with the mounting cylinder 404 fixing, two bolts are arranged on both sides of the mounting cylinder 404, and the bolts enter the slide grooves 405 after being screwed.

[0041] A ventilation opening is arranged at one end of the mounting cylinder 404 close to the air nozzle 408, and the ventilation opening of the mounting cylinder 404 is arranged around the air nozzle 408.

[0042] The working principle and use process of the present application are as follows: when the catheter is processed, two cases are divided:

[0043] When the short catheter is processed, the air feeding assemblies 4 on both sides are all moved to the same side of the clamp 3, then the connecting pipe 407 with a proper size is selected and connected with the air nozzle 408, and the two are installed in the mounting cylinder 404.

[0044] Before punching, nitrogen is filled into the installation cylinder 404 through the external gas cylinder, and the through bar 4073 is pushed into the short guide pipe by the nitrogen pressure. This step is used to detect whether the guide pipe is blocked or deformed. When the through bar 4073 completely passes through the guide pipe, it will enter the connecting pipe 407 on the other side and be captured by the magnet 4072 in the pipe, completing the detection.

[0045] After the detection of the through bar 4073 is completed, the external gas cylinder switches the gas supply path to fill nitrogen into the air chamber 406. After the nitrogen is divided by the flow guide block 409, it is blown out from the air nozzle 408 and the installation cylinder 404 respectively:

[0046] Before processing the long guide pipe, only the gas feeding assembly 4 on the feeding side needs to be moved to the designated side, and the assembly and installation of the connecting pipe 407, the air nozzle 408 and the installation cylinder 404 are completed.

[0047] Before punching, the clamp 3 at the feeding end is controlled to clamp and pinch the long guide pipe, ensuring the stability of the position of the guide pipe, and then the external gas cylinder is started for blowing operation. It should be noted that when processing the long guide pipe, the through bar 4073 does not need to be started for detection, and it can directly enter the punching and auxiliary blowing link.

[0048] The above examples are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered to fall within the protection scope of the present application.

Claims

1. A medical catheter laser drilling device for reducing material thermal deformation, comprising an air delivery assembly (4) disposed within the device body (1), characterized in that: The air supply assembly (4) includes a mounting cylinder (404), an air chamber (406), a connecting pipe (407), a guide bar (4073), and an air nozzle (408). The mounting cylinder (404) has an air chamber (406) inside. The mounting cylinder (404) has a connecting pipe (407) inside. The guide bar (4073) is slidably arranged inside the connecting pipe (407). An air nozzle (408) is fixedly arranged at one end of the connecting pipe (407). The device body (1) is provided with an installation base (2) inside. The upper ends of the installation base (2) are provided with clamps (3) on both sides. The clamps (3) are used to hold the conduit. The outer sides of the clamps (3) are provided with air supply components (4). A spring (4071) is fixedly installed at the end of the connecting pipe (407) away from the air chamber (406), and a magnet (4072) is fixedly installed at the end of the spring (4071) near the air chamber (406). The magnet (4072) is used to fix the guide bar (4073). The connecting tube (407) has a through hole for connecting the air tube at one end near the spring (4071). The tube (4073) is made of metal. The tube (4073) and the connecting tube (407) are fitted with a clearance. The inner diameter of the connecting tube (407) is the same as the inner diameter of the air nozzle (408). A square hole (4081) is provided on the side where the air nozzle (408) is connected to the connecting pipe (407). A guide block (409) is provided between the connection point of the connecting pipe (407) and the air nozzle (408). The guide block (409) is fixedly connected to the connecting pipe (407). The guide block (409) has two types of air ducts. The air ducts in the guide block (409) can respectively send the gas in the gas chamber (406) to the air nozzle (408) and the mounting cylinder (404). The gas sent from the guide block (409) to the air nozzle (408) directly enters the air nozzle (408), while the gas sent from the guide block (409) to the mounting cylinder (404) is discharged through the square hole (4081). The gas blown out by the mounting cylinder (404) flows along the outer wall of the guide tube and can promptly blow away the fumes generated during the drilling process. The gas blown out by the air nozzle (408) directly enters the inside of the guide tube, keeping the inside of the guide tube in a high-pressure gas environment, which can quickly discharge the fumes and melts generated during drilling and effectively reduce the probability of burrs appearing on the hole wall.

2. The medical catheter laser drilling device for reducing material thermal deformation according to claim 1, characterized in that: The end of the connecting pipe (407) is located at the end of the mounting cylinder (404) near the clamp (3). The air chamber (406) is located outside the end of the connecting pipe (407). The connecting pipe (407) and the air nozzle (408) are connected by bolts. The air chamber (406) is connected to the external air pipe through two pipes.

3. The medical catheter laser drilling device for reducing material thermal deformation according to claim 1, characterized in that: The air supply assembly (4) also includes a slide rail (401), which is disposed on one side of the clamp (3). There are two slide rails (401), and a mounting plate (402) is disposed between the slide rails (401). The upper and lower ends of the mounting plate (402) are provided with sliding sleeves connected to the slide rails (401). A mounting seat (403) is disposed in the middle of the mounting plate (402). A mounting cylinder (404) is slidably disposed inside the mounting seat (403). The mounting seat (403) is used to fix the mounting cylinder (404).

4. The medical catheter laser drilling device for reducing material thermal deformation according to claim 3, characterized in that: The mounting base (403) has sliding grooves (405) on both sides. The sliding grooves (405) are used to fix the mounting cylinder (404). Two bolts are provided on both sides of the mounting cylinder (404). After the bolts are screwed in, they enter the sliding grooves (405).

5. A medical catheter laser drilling device for reducing material thermal deformation according to claim 4, characterized in that: The mounting cylinder (404) has a ventilation opening at one end near the air nozzle (408), and the ventilation opening of the mounting cylinder (404) is located around the air nozzle (408).

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