A device for cutting a fixed length of a medical polymer catheter

Abstract

The utility model relates to a device based on medical polymer catheter fixed-length ring cutting belongs to catheter cutting equipment technical field. The rotary table mechanism sets up on the base, and the cutter rotation sets up on the rotary table mechanism, wherein, the number of cutter is not less than two groups, and all set up on the rotary table mechanism, and the polymer catheter is worn in the rotary table mechanism, and is surrounded by multiple cutter, and the rotary table mechanism sets up on the base, and the rotary table mechanism is used for driving multiple cutter to do the circular motion, and the cutting end of cutter and the polymer catheter's to be cut part abuts. The device is set up the number not less than two groups of cutter rotation setting on the rotary table mechanism, makes the polymer catheter pass through multiple cutter center and the rotary table mechanism, and is driven by the rotary table mechanism multiple cutter to do the circular motion, realizes the annular cutting of polymer catheter, avoids the'fish mouth phenomenon' of the direct cutting mode in the prior art due to local stress concentration, and ensures that the cutting surface is smooth without burr.

Description

Technical Field

[0001] This utility model relates to the field of catheter cutting equipment technology, and in particular to a device for fixed-length circumferential cutting of medical polymer catheters. Background Technology

[0002] In the field of medical devices, medical polymer catheters (such as catheters made of PU, PTFE, and HDPE) are key consumables for scenarios such as vascular access establishment and organ diagnosis and treatment. In clinical applications, catheters need to be cut to a fixed length to adapt to different diagnostic and treatment needs.

[0003] Currently, medical polymer catheters are mostly cut using horizontal or vertical direct cutting methods. However, these catheters are flexible and elastic, and uneven local stress during the cutting process can easily lead to a "fish mouth phenomenon" (i.e., uneven cuts, slanted cuts, or local bulges). On the one hand, uneven cuts affect the appearance quality of the catheter; on the other hand, during implantation, burrs or deformation at the port may damage blood vessels, posing a safety hazard.

[0004] Meanwhile, existing cutting devices lack versatility and are difficult to adapt to catheters of different diameters; moreover, some devices have complex structures and high operational thresholds, which are not conducive to efficient use in clinical or production scenarios. Therefore, there is an urgent need for a medical polymer catheter cutting device that can achieve fixed-length cutting, ensure clean cuts, and has strong adaptability. Utility Model Content

[0005] This invention provides a device for fixed-length circumferential cutting of medical polymer catheters, which solves at least one of the above-mentioned technical problems.

[0006] This utility model provides a device for fixed-length circumferential cutting of medical polymer catheters, comprising: Base; The turntable mechanism is mounted on the base. The cutting tool rotates on a turntable mechanism; The number of cutting tools is no less than two sets, and both are set on the turntable mechanism. The polymer conduit passes through the turntable mechanism and is surrounded by multiple sets of cutting tools. The turntable mechanism is set on the base and is used to drive multiple sets of cutting tools to make circular motion. The cutting end of the cutting tool abuts against the part of the polymer conduit to be cut.

[0007] In one embodiment, the turntable mechanism includes: A fixed turntable is fixedly mounted on the base; The tool turntable is rotatably connected to the inner ring of the fixed turntable, and the tool is fixedly connected to the side of the tool turntable away from the base.

[0008] In one embodiment, the cutting tool includes: The movable seat fixing block is fixedly connected to the tool turntable; The tool moving seat is slidably connected to the moving seat fixing block; The cutting mechanism is mounted on the tool moving seat; The moving seat fixing block, the tool moving seat and the cutting mechanism are all provided in multiple sets, and are evenly distributed circumferentially with the center of the cross-section of the polymer duct to be cut as the center.

[0009] In one embodiment, the cutting mechanism includes: The cutter is slidably connected inside the cutter moving seat; The cutter has an elongated hole, through which the limit pin passes and connects to the cutter moving seat.

[0010] In one embodiment, a tension spring is hinged to one end of the movable seat fixing block, and a fixing pin is provided on the tool movable seat, with the other end of the tension spring hinged to the fixing pin.

[0011] In one embodiment, a blade guard is connected to the side of the tool moving seat away from the cutting end of the cutting mechanism.

[0012] In one embodiment, the cutting edge of the cutter is a beveled edge, which causes a shearing action to be formed between the cutter and the polymer conduit in a predetermined rotation direction of the cutter turntable.

[0013] In one embodiment, the tool turntable has a through hole, and the base has a guide tube receiving groove, with the through hole located at one end of the guide tube receiving groove.

[0014] In one embodiment, a scale is provided on the base, and the scale is distributed along the length direction of the conduit receiving groove.

[0015] In one embodiment, the bottom of the base is fixedly connected to multiple sets of support columns.

[0016] Compared with the prior art, the advantages of this utility model are that the device has at least two sets of cutting tools rotating on a turntable mechanism. After the polymer catheter passes through the center of multiple sets of cutting tools and the turntable mechanism, the turntable mechanism drives the multiple sets of cutting tools to make a circular motion, thereby realizing the annular cutting of the polymer catheter. This multi-cutting circular cutting method, combined with the support wires set inside the polymer catheter, makes the stress distribution on the outer surface of the polymer catheter uniform, completely avoiding the "fish mouth phenomenon" caused by local stress concentration in the straight cutting method of the prior art. It ensures that the cut surface is flat and burr-free, greatly improving the safety of polymer catheter implantation in the human body and reducing the risk of vascular damage caused by uneven port.

[0017] Meanwhile, the symmetrical arrangement of multiple blades combined with the coordinated movement of the rotary mechanism allows for flexible adaptation to medical polymer catheters of different diameters (such as catheters made of PU, PTFE, HDPE, etc.), eliminating the need for frequent equipment or accessory changes and demonstrating strong versatility. This device can be controlled manually via the rotation of the rotary mechanism and the feed of the blades, or via an external power source. Furthermore, the synchronous circumferential cutting with multiple blades effectively improves cutting efficiency, reduces repetitive operations during single-blade cutting, and lowers the production or clinical preparation time and costs of medical polymer catheters while ensuring cutting accuracy. Attached Figure Description

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of a device based on fixed-length circumferential cutting of a medical polymer catheter according to the present invention.

[0020] Figure 2 This is a schematic diagram of the cutting tool in a device for fixed-length circumferential cutting of medical polymer catheters according to this utility model.

[0021] Figure 3 This is a schematic diagram of the turntable mechanism in a device based on fixed-length circumferential cutting of a medical polymer catheter according to this utility model.

[0022] Figure 4 This is a schematic diagram of the tension spring structure in a device based on fixed-length circumferential cutting of a medical polymer catheter according to this utility model.

[0023] Figure 5 This is a schematic diagram of the perforation structure in a device based on fixed-length circumferential cutting of a medical polymer catheter according to this utility model.

[0024] Figure label: 100. Base; 200. Turntable mechanism; 210. Fixed turntable; 220. Tool turntable; 300. Tool; 310. Moving seat fixing block; 320. Tool moving seat; 330. Cutting mechanism; 331. Cutting tool; 332. Limiting pin; 333. Oblong hole; 340. Tension spring; 350. Fixing pin; 360. Tool guard; 400. Through hole; 500. Receiving groove; 600. Scale; 700. Support column. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] This invention provides a device based on fixed-length circumferential cutting of a medical polymer catheter, such as... Figures 1-5As shown, it includes: a base 100, a turntable mechanism 200, and a cutter 300. The turntable mechanism 200 is disposed on the base 100, and the cutter 300 is rotatably disposed on the turntable mechanism 200. There are no fewer than two sets of cutters 300, and they are all disposed on the turntable mechanism 200. The polymer conduit passes through the turntable mechanism 200 and is surrounded by multiple sets of cutters 300. The turntable mechanism 200 is disposed on the base 100 and is used to drive multiple sets of cutters 300 to perform circular motion. The cutting end of the cutter 300 abuts against the part of the polymer conduit to be cut.

[0027] Specifically, the core structure of this utility model device consists of a base 100, a turntable mechanism 200, and cutters 300. These components work together to achieve the fixed-length circumferential cutting function of the polymer catheter. The base 100, as the basic support component of the entire device, provides stable support for the components on it, preventing cutting accuracy deviations caused by base wobbling during the cutting process. The turntable mechanism 200 is fixedly installed on one side of the base 100, and its rotation center must always be coaxial with the polymer catheter placed on the base 100. The number of cutters 300 is no less than two sets, preferably two or four sets. This utility model uses two sets as an example. The multiple sets of cutters 300 are symmetrically distributed circumferentially around the center of the turntable mechanism 200, ensuring that the cutting force of the cutters 300 on the polymer catheter is evenly distributed in the circumferential direction of the polymer catheter, ensuring uniform stress distribution and avoiding the "fish mouth phenomenon."

[0028] Furthermore, during use, the operator must sequentially pass one end of the polymer catheter to be cut through the central area formed by multiple sets of blades 300 and the through-hole 400 of the turntable mechanism 200, finally placing it in the corresponding positioning structure on the base 100, so that the part of the polymer catheter to be cut is precisely aligned with the cutting end of the blade 300. After starting the cutting operation, the turntable mechanism 200 drives the multiple sets of blades 300 to rotate, and at the same time, through manual or automatic drive, the cutting ends of the blades 300 gradually approach and tightly abut against the part of the polymer catheter to be cut, completing the annular cut of the polymer catheter during the circumferential motion. This multi-blade circumferential cutting design, unlike the horizontal or vertical cutting in the existing technology, can evenly distribute the cutting force on the entire circumferential surface of the polymer catheter, avoiding local stress concentration that causes deformation of the polymer catheter, and fundamentally solving the "fish mouth phenomenon".

[0029] Furthermore, the arrangement of multiple sets of cutters 300 not only ensures balanced cutting force but also gives the device excellent versatility. By adjusting the relative distance between the multiple sets of cutters, it can be adapted to medical polymer catheters of different diameters. Whether it is a small-diameter microcatheter or a large-diameter drainage catheter, stable cutting can be achieved by adjusting the position of the cutter 300 without the need to replace the special cutting components. At the same time, the rotational connection between the cutter 300 and the turntable mechanism 200 ensures the rotational accuracy of the cutter 300 during circumferential motion, keeping the cutting surface perpendicular to the catheter axis at all times, further improving the smoothness of the incision. Meanwhile, to further ensure the smoothness of the cut surface of the polymer catheter, a support wire can be placed inside it. Medical polymer catheters generally have significant flexibility and elasticity. For polymer catheters with thin walls or low hardness, the radial pressure applied by the cutter 300 during cutting may still cause slight local collapse and inner wall contraction of the polymer catheter, which in turn causes the incision to tilt, bulge, and other "fish mouth phenomena". However, after the support wire is inserted into the inner lumen of the polymer catheter, it is equivalent to providing a "rigid skeleton" for the polymer catheter, which can directly resist the radial pressure of the cutter 300 and force the polymer catheter to maintain a circular cross-sectional shape during the cutting process, avoiding deformation caused by local stress concentration.

[0030] Preferred, such as Figure 1 As shown, the turntable mechanism 200 includes a fixed turntable 210 and a tool turntable 220. The fixed turntable 210 is fixedly mounted on the base 100, the tool turntable 220 is rotatably connected to the inner ring of the fixed turntable 210, and the tool 300 is fixedly connected to the side of the tool turntable 220 away from the base 100.

[0031] Specifically, the turntable mechanism 200, as the core transmission component driving the tool 300 to achieve circular motion, adopts a nested structure design with a fixed outer ring and a rotating inner ring. It consists of two parts: a fixed turntable 210 and a tool turntable 220. The fixed turntable 210 uses a ring structure design and is fixedly mounted on the base 100, ensuring that it is secure and does not shift after installation, providing a stable rotational support foundation for the tool turntable 220. The inner ring of the fixed turntable 210 is machined with a high-precision annular guide rail or bearing mounting groove for rotatable connection with the tool turntable 220. The selection of the guide rail or bearing must meet the requirements of low friction and high coaxiality to ensure smooth and uninterrupted rotation of the tool turntable 220.

[0032] Furthermore, the outer diameter of the tool turntable 220 matches the inner ring size of the fixed turntable 210. It achieves a nested rotational connection with the inner ring of the fixed turntable 210 via a bearing assembly or sliding guide rail. Its rotation center completely coincides with the center of the fixed turntable 210, ensuring coaxiality during rotation. Multiple evenly distributed tool mounting positions are machined on the side of the tool turntable 220 away from the base 100. These mounting positions are equipped with positioning grooves and threaded holes for fixed connection between the tool 300 and the tool turntable 220. After installation, the movement trajectory of the tool 300's cutting end forms an annular cutting path centered on the rotation center of the tool turntable 220, adapting to the part of the polymer conduit to be cut.

[0033] Furthermore, during the cutting process, the fixed turntable 210 remains stationary, providing stable support for the entire turntable mechanism. The tool turntable 220 rotates around the center of the fixed turntable 210 under external force, thereby driving multiple sets of tools 300 mounted on it to perform synchronous circular motion, achieving annular cutting of the polymer catheter. This nested turntable structure design ensures the stability and accuracy of the rotational motion, simplifies the transmission structure, and reduces the operation and maintenance costs of the device.

[0034] Preferred, such as Figure 2 As shown, the tool 300 includes: a movable seat fixing block 310, a tool movable seat 320, and a cutting mechanism 330. The movable seat fixing block 310 is fixedly connected to the tool turntable 220, the tool movable seat 320 is slidably connected to the movable seat fixing block 310, and the cutting mechanism 330 is disposed on the tool movable seat 320. Multiple sets of the movable seat fixing block 310, the tool movable seat 320, and the cutting mechanism 330 are provided and are evenly distributed circumferentially around the center of the cross-section of the polymer duct to be cut.

[0035] Specifically, the cutting tool 300, as the core component that directly performs the cutting action, adopts a modular subdivided structure design. It consists of three parts: a moving seat fixing block 310, a cutting tool moving seat 320, and a cutting mechanism 330. Each part is equipped with multiple sets. The moving seat fixing block 310 is fixedly connected to the preset mounting position of the cutting tool turntable 220 by bolts. During installation, it can be precisely positioned by pre-opening positioning grooves to ensure that multiple sets of moving seat fixing blocks 310 are evenly distributed circumferentially with the center of the cross-section of the polymer duct to be cut as the center.

[0036] Furthermore, the tool moving seat 320 is a slider structure adapted to the moving seat fixing block 310. The connection with the moving seat fixing block 310 is achieved through sliding engagement, ensuring that the tool moving seat 320 can slide smoothly along the guide rail direction without lateral deviation during sliding. A cutting mechanism 330 is provided at the end of the tool moving seat 320.

[0037] Furthermore, the cutting mechanism 330 is the component that directly contacts the polymer catheter and performs the cutting action, used for stable cutting of the polymer catheter. The circumferentially uniform distribution design of multiple sets of movable seat fixing blocks 310, cutter moving seat 320, and cutting mechanism 330 is key to achieving balanced cutting force. Taking two sets of components as an example, the two sets of structures are symmetrically distributed on both sides of the polymer catheter. During cutting, the radial forces applied to the polymer catheter are equal in magnitude and opposite in direction, ensuring that the catheter is always in a state of force balance during the cutting process, avoiding displacement or deformation of the polymer catheter due to unilateral force. At the same time, the sliding connection between the cutter moving seat 320 and the movable seat fixing block 310 allows for adjustment of the distance between the cutting mechanism 330 and the polymer catheter, thereby adapting to polymer catheters of different diameters and improving the versatility of the device.

[0038] Preferred, such as Figure 2 As shown, the cutting mechanism 330 includes a cutting blade 331 and a limiting pin 332. The cutting blade 331 is slidably connected inside the tool moving seat 320. An elongated hole 333 is provided on the cutting blade 331, and the limiting pin 332 passes through the elongated hole 333 and is connected to the tool moving seat 320.

[0039] Specifically, the cutting mechanism 330, as the direct actuator of the cutting action, directly affects the cutting accuracy and cut quality through its structural design. It consists of a cutting blade 331 and a limiting pin 332. The cutting blade 331 can be made of high-strength cemented carbide or diamond-coated material, giving it high hardness, high wear resistance, and a sharp cutting edge. This allows it to easily handle the cutting needs of medical polymer catheters made of different materials such as PU, PTFE, and HDPE, reducing the tensile deformation of the catheter during the cutting process. The mounting end of the cutting blade 331 has an elongated hole 333, the length of which is aligned with the cutting feed direction of the cutting blade 331, providing space for fine-tuning the position of the cutting blade 331.

[0040] Furthermore, after the limit pin 332 passes through the elongated hole 333 on the cutter 331, it is fixedly connected to the pre-set threaded hole or mounting hole on the tool moving seat 320. After the limit pin 332 is tightened, it can fix the cutter 331 on the tool moving seat 320. After it is loosened, the cutter 331 can move along the length direction of the elongated hole 333, thereby achieving the effect of adjusting the feed rate. After the adjustment is completed, the limit pin 332 only needs to be tightened again to complete the fixing of the cutter 331.

[0041] Furthermore, in another embodiment, the limiting pin 332 cooperates with the tool moving seat 320 only to serve as a guide, allowing the cutter 331 to slide along the length direction of the tool moving seat 320, and to fix the cutter 331 by the limiting pin 332, so as to avoid excessive or insufficient feed during cutting. In this embodiment, the design of the elongated hole 333 can compensate for the position deviation of the cutter caused by machining error or assembly error, and improve the assembly accuracy and cutting stability of the cutter mechanism 330.

[0042] Preferred, such as Figure 4 As shown, one end of a tension spring 340 is hinged to the movable seat fixing block 310, and a fixing pin 350 is provided on the tool movable seat 320. The other end of the tension spring 340 is hinged to the fixing pin 350.

[0043] Specifically, to achieve automatic reset of the tool moving seat 320 and provide stable return force during cutting, a tension spring 340 is installed between the moving seat fixing block 310 and the tool moving seat 320. The moving seat fixing block 310 has a dedicated tension spring mounting hole or hinge seat. One end of the tension spring 340 is fixed to this mounting hole or hinge seat via a hook or hinge, ensuring a secure connection and preventing it from falling off. A fixing pin 350 is fixedly installed at a corresponding position on the tool moving seat 320. The axis of the fixing pin 350 is perpendicular to the tension direction of the tension spring 340. The other end of the tension spring 340 is hinged to the fixing pin 350 via a hook or ring structure, ensuring that the tension spring 340 can rotate flexibly during tension and return, avoiding the generation of additional torque.

[0044] Furthermore, in the initial state, the tension spring 340 is in a naturally extended or slightly stretched state, and the tool moving seat 320 is in an initial position away from the polymer catheter under the tension of the tension spring 340, which facilitates the placement and positioning of the polymer catheter. When the cutting operation is performed, the operator pushes the tool moving seat 320 to slide towards the polymer catheter, the tension spring 340 is stretched, and an inward elastic force is generated. This force is transmitted to the cutting mechanism 330 through the tool moving seat 320, so that the cutting edge of the cutter 331 is in close contact with the catheter surface with stable pressure.

[0045] Furthermore, during the cutting process, the elastic tension of the tension spring 340 and the resistance of the cutter 331 when cutting the conduit form a dynamic balance, ensuring that the cutter 331 always applies constant pressure to the conduit, thus improving the flatness of the cut surface. After cutting is completed, the external force on the tool moving seat 320 is removed, and the tension spring 340 contracts under the action of elastic force, causing the tool moving seat 320 to automatically return to its initial position, preparing for the next cutting operation.

[0046] Preferred, such as Figure 2 , 4As shown, a blade guard 360 is connected to the side of the tool moving seat 320 away from the cutting end of the cutting mechanism 330.

[0047] Specifically, the connection method of the blade guard 360 can be detachable, and it can be fixed to the blade moving seat 320 by means of bolts, buckles or threaded connections. Its shape design can be arc-shaped or handle-shaped, which is convenient for operators or external drive structures to hold and apply force.

[0048] Furthermore, when in use, only the same external force needs to be applied to make the two sets of blade guards move relative to each other at 360 degrees, so that the feed amount of the two sets of cutters 331 is the same. When performing ring cutting, the two cutting ends of the polymer catheter are subjected to the same force, avoiding the "fish mouth effect" and the cutting surface is flat.

[0049] Preferably, the cutting edge of the cutter 331 is an oblique edge, so that a shearing action is formed between the cutter 331 and the polymer conduit in the predetermined rotation direction of the cutter turntable 220.

[0050] Specifically, the cutting end of the cutter 331 is designed with an angle, and the rotation direction of the cutter turntable 220 is set from the long side to the short side of the cutter 331. During the cutting process, this avoids the blade tip located on the long side of the cutter 331 from coming into contact with the polymer catheter, thus preventing it from directly piercing the polymer catheter.

[0051] Preferred, such as Figure 5 As shown, the tool turntable 220 has a through hole 400, and the base 100 has a guide tube receiving groove 500. The through hole 400 is located at one end of the guide tube receiving groove 500.

[0052] Specifically, to achieve precise positioning and stable support of the polymer catheter, the device has a through-hole 400 on the cutter turntable 220 and a corresponding catheter receiving groove 500 on the base 100, with the through-hole 400 located at one end of the catheter receiving groove 500, forming a through-type polymer catheter channel. The through-hole 400 is a circular through hole with a diameter slightly larger than the maximum diameter of the catheter to be cut, ensuring that the catheter can pass through smoothly. At the same time, the walls of the through-hole 400 and the inner walls of the receiving groove 500 are smoothed to avoid scratching the surface of the polymer catheter. The center of the through-hole 400 coincides with the rotation center of the cutter turntable 220, ensuring that the axis of the catheter is coaxial with the annular cutting trajectory of the cutter 300 when it passes through.

[0053] Furthermore, the catheter receiving groove 500 is formed on the upper surface of the base 100, extending along the length of the base. Its cross-sectional shape can be V-shaped, U-shaped, or arc-shaped, adapting to the outer contour of the polymer catheter. This not only stably clamps the polymer catheter to prevent it from shaking but also avoids damage to the catheter due to excessive clamping force. One end of the catheter receiving groove 500 is aligned directly below the through-hole 400, forming a continuous polymer catheter support path. This ensures that the polymer catheter maintains the straightness and stability of its axis throughout the process from passing through the through-hole 400 to being placed in the catheter receiving groove 500.

[0054] In use, the polymer catheter passes through the perforation 400 sequentially and is placed in the catheter receiving groove 500. The perforation 400 limits the radial position of the polymer catheter, preventing lateral displacement during cutting. The catheter receiving groove 500 provides axial support to the polymer catheter, preventing bending deformation due to its own weight or cutting force. The combination of these two features ensures that the polymer catheter remains in a stable position during cutting, guaranteeing that the cutting surface is perpendicular to the axis of the polymer catheter and improving cutting accuracy.

[0055] Preferably, a scale 600 is provided on the base 100, and the scale 600 is distributed along the length direction of the guide tube receiving groove 500.

[0056] Specifically, in order to achieve fixed-length cutting of polymer catheters, a scale 600 is set on the base 100, and the scale 600 is distributed along the length direction of the catheter receiving groove 500 to form an intuitive length measurement benchmark.

[0057] Furthermore, the scale 600 is installed parallel to and close to the catheter receiving groove 500, allowing operators to directly observe the scale corresponding to the end of the polymer catheter when placing the catheter, and quickly determine the required cutting length. In another embodiment, a sliding positioning baffle can also be provided. The baffle can move along the scale 600 and be fixed at a preset scale position. After the end of the polymer catheter abuts against the positioning baffle, rapid length setting can be achieved, reducing errors from manual reading and improving length setting efficiency.

[0058] Furthermore, the 600-degree scale setting allows operators to intuitively and accurately control the cutting length of polymer catheters, meeting the differentiated needs of polymer catheter length in different treatment scenarios, avoiding medical operation errors caused by length errors, and improving the standardization and consistency of the cutting process.

[0059] Preferably, the bottom of the base 100 is fixedly connected to multiple sets of support columns 700.

[0060] Specifically, to ensure the overall stability and ease of operation of the device, multiple sets of support columns 700 are fixedly connected to the bottom of the base 100, forming a stable support structure. This structure can be designed as fixed or adjustable according to the usage scenario, ensuring that the base 100 remains level when the device is placed on a workbench, preventing tilting due to unevenness and ensuring cutting accuracy.

[0061] Furthermore, an anti-slip pad can be installed at the bottom of the support column 700. The anti-slip pad has anti-slip textures on its surface, which can increase the friction with the worktable surface, prevent the device from sliding due to force during the cutting process, and improve operational safety and cutting accuracy.

[0062] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device based on fixed-length circumferential cutting of a medical polymer catheter, characterized in that, include: Base (100); A turntable mechanism (200) is disposed on the base (100); The cutting tool (300) is rotatably mounted on the turntable mechanism (200); The number of the cutting tools (300) is not less than two sets, and they are all set on the turntable mechanism (200). The polymer conduit passes through the turntable mechanism (200) and is surrounded by multiple sets of the cutting tools (300). The turntable mechanism (200) is set on the base (100). The turntable mechanism (200) is used to drive multiple sets of cutting tools (300) to make circular motion. The cutting end of the cutting tool (300) abuts against the part of the polymer conduit to be cut.

2. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 1, characterized in that, The turntable mechanism (200) includes: A fixed turntable (210) is fixedly mounted on the base (100); A tool turntable (220) is rotatably connected to the inner ring of the fixed turntable (210), and the tool (300) is fixedly connected to the side of the tool turntable (220) away from the base (100).

3. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 2, characterized in that, The cutting tool (300) includes: The movable seat fixing block (310) is fixedly connected to the tool turntable (220); The tool moving seat (320) is slidably connected to the moving seat fixing block (310); A cutting mechanism (330) is disposed on the cutter moving seat (320); The movable seat fixing block (310), the tool movable seat (320) and the cutting mechanism (330) are all provided in multiple sets, and are evenly distributed circumferentially with the center of the cross section of the polymer duct to be cut as the center.

4. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 3, characterized in that, The cutting mechanism (330) includes: A cutter (331) is slidably connected inside the cutter moving seat (320); The limiting pin (332) has an elongated hole (333) on the cutter (331), and the limiting pin (332) passes through the elongated hole (333) and is connected to the cutter moving seat (320).

5. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 3, characterized in that, One end of a tension spring (340) is hinged to the movable seat fixing block (310), and a fixing pin (350) is provided on the tool moving seat (320). The other end of the tension spring (340) is hinged to the fixing pin (350).

6. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 3, characterized in that, The tool moving seat (320) is connected to a tool guard (360) on the side away from the cutting end of the cutting mechanism (330).

7. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 3, characterized in that, The cutting edge of the cutter (331) is a beveled edge, which causes a shearing action between the cutter (331) and the polymer conduit in the predetermined rotation direction of the cutter turntable (220).

8. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 2, characterized in that, The tool turntable (220) has a through hole (400), and the base (100) has a guide tube receiving groove (500). The through hole (400) is located at one end of the guide tube receiving groove (500).

9. The device based on fixed-length circumferential cutting of medical polymer catheters according to claim 8, characterized in that, A scale (600) is provided on the base (100), and the scale (600) is distributed along the length direction of the conduit receiving groove (500).

10. The device for fixed-length circumferential cutting of medical polymer catheters according to claim 1, characterized in that, The bottom of the base (100) is fixedly connected to multiple sets of support columns (700).

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