Single-use coronary angiography catheter

Abstract

This invention discloses a disposable coronary angiography catheter, relating to the field of coronary angiography. It includes a rectangular soft magnetic base with a fixing plate fixedly mounted on its top. A quick-change assembly is located on the top of the fixing plate. The quick-change assembly includes a first cylinder fixedly mounted on the side wall of the fixing plate. Multiple circular holes are arranged in a ring array on the first cylinder, and a sphere is slidably connected inside each hole. The quick-change assembly avoids the need for repositioning when changing to different models of coronary angiography catheters, thus significantly shortening the time required for traditional coronary angiography catheter replacement and reducing the surgical risk for patients. Furthermore, it allows for multiple catheter switching at a single puncture point, reducing the number of vascular punctures and further lowering the surgical risk for patients. It can also adapt to the surgical needs of different models of coronary angiography catheters, thereby improving the device's adaptability.

Description

Technical Field

[0001] This invention relates to the field of coronary angiography, specifically to a disposable coronary angiography catheter. Background Technology

[0002] Coronary angiography is a commonly used method for diagnosing coronary atherosclerotic heart disease (CAD). It is a relatively safe and reliable invasive diagnostic technique that is now widely used in clinical practice and is considered the "gold standard" for diagnosing CAD. In cases such as patients with chest pain of unknown origin, asymptomatic patients with electrocardiograms indicating myocardial ischemia, or high-risk individuals for CAD (e.g., family history, metabolic syndrome), medical personnel need to locate the radial or femoral artery and insert a coronary angiography catheter. The catheter is selectively inserted into the openings of the left and right coronary arteries, and a contrast agent (such as iodine methylphenidate) is injected. The morphology of the blood vessels is visualized under X-ray to determine the degree of stenosis and the location of the lesion, thereby enabling diagnosis and treatment.

[0003] Chinese Patent Application No. 201921455004.3 discloses a "catheter for coronary angiography via the radial artery," comprising: a first catheter, a second catheter, and a head catheter, wherein the first catheter and the head catheter are connected via the second catheter; the tip of the head catheter is horizontally upward at a 15-degree angle; and the head catheter has side holes on its wall. The beneficial effects of this application are as follows: the first catheter is composed of nylon and a metal braided mesh, which maintains good support while increasing the flexibility of the first catheter, resulting in better torque transmission during operation, good maneuverability, and easier insertion into the coronary artery.

[0004] This technical solution only addresses how to change the angle of the catheter. However, when encountering coronary artery ostia with abnormalities, such as a high coronary artery ostium requiring catheter replacement, a slow catheter replacement time increases the patient's surgical risk. Multiple catheter switching cannot be achieved simultaneously at a single puncture point, increasing the number of vascular punctures and thus the patient's surgical risk. During drug injection, negative pressure can lead to air intake within the catheter, increasing the risk of air embolism. Regurgitation can result in insufficient drug dosage entering the blood vessel, failing to ensure accurate delivery of the target dose and increasing drug waste. Frequent regurgitation management further delays the smoothness of the procedure. Additionally, catheter movement during coronary angiography can cause errors in the angiography and damage to the blood vessel.

[0005] Therefore, the use of disposable coronary angiography catheters is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a disposable coronary angiography catheter to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a disposable coronary angiography catheter, comprising a rectangular soft magnetic base, a fixing plate fixedly mounted on the top of the rectangular soft magnetic base, a quick-replacement assembly provided on the top of the fixing plate, the quick-replacement assembly comprising a first cylinder, the first cylinder being fixedly mounted on the side wall of the fixing plate, a plurality of circular holes being arranged in an annular array on the first cylinder, an annular plate being fixedly connected to the outer side of the first cylinder, a first spring being fixedly connected to the side of the annular plate near the circular holes, and a ball being slidably connected inside each of the circular holes;

[0008] A coronary angiography catheter is slidably connected to the side wall of the fixation plate.

[0009] The top of the rectangular soft magnetic base is provided with an anti-sway component, which includes a fixed bracket, and the fixed bracket is fixedly installed on the top of the rectangular soft magnetic base.

[0010] The coronary angiography catheter is equipped with an anti-backflow component, which includes a ring and a fixing post. The ring is fixedly installed in the inner lumen of the coronary angiography catheter, and the fixing post is fixedly installed in the inner lumen of the coronary angiography catheter.

[0011] Furthermore, the quick-change assembly also includes a second cylinder, the outer side of which is slidably connected to the first cylinder. An annular groove is provided on the outer side of the second cylinder. A limiting plate is fixedly connected to the side of the first spring away from the annular plate, and a sliding column is fixedly connected to the side of the limiting plate away from the sphere.

[0012] Furthermore, one end of the coronary angiography catheter one is threadedly connected to the coronary angiography catheter two, and the material of the coronary angiography catheter one is set as polyetheretherketone.

[0013] Furthermore, the anti-sway assembly also includes a vertical limiting post, which is fixedly connected to the inner wall of the fixed bracket. Sliding blocks are symmetrically slidably connected to the outer side of the vertical limiting post. A bidirectional threaded rod is fixedly connected to the inner wall of the fixed bracket. A connecting rod is fixedly connected to the side wall of each sliding block. An arc-shaped plate is fixedly connected to the end of each connecting rod away from the sliding block. A rotary knob is fixedly connected to the top of the bidirectional threaded rod.

[0014] Furthermore, the anti-backflow component also includes a second spring, which is fixedly installed on the side wall of the fixed post near the ring. The end of the second spring away from the fixed post is fixedly connected to a third cylinder. The end of the ring near the fixed post is fixedly connected to a sealing ring, and the end of the third cylinder away from the fixed post is fixedly connected to a frustum.

[0015] Furthermore, the size of the annular groove is adapted to the size of the sphere, the sphere is located on the movement path of the circular hole, the outer side of the coronary angiography catheter is slidably connected to the first cylinder, and the outer side of the coronary angiography catheter is fixedly connected to the second cylinder.

[0016] Furthermore, the end of each sliding block away from the vertical limiting post is threadedly connected to a bidirectional threaded rod, the coronary angiography catheter is located on the movement path of the two connecting rods, and the bottom of the rotary knob is rotatably connected to the fixed bracket.

[0017] Furthermore, the inside of the ring is slidably connected to the frustum, the fixed column is slidably adapted to the inner cavity of the third cylinder, and the outer side of the frustum is slidably connected to the sealing ring through it.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The quick-change component design avoids the need for repositioning when changing to different models of coronary angiography catheters, thus greatly shortening the time required for traditional coronary angiography catheter replacement and reducing the surgical risk for patients. At the same time, the single puncture point enables switching between multiple catheters, reducing the number of vascular punctures and further reducing the surgical risk for patients. It can also adapt to the surgical needs of different models of coronary angiography catheters, thereby improving the device's adaptability.

[0020] The anti-sloshing component prevents errors in coronary angiography caused by catheter sloshing during the procedure, while also reducing damage to blood vessels due to sloshing.

[0021] The anti-backflow component prevents air from being drawn into the catheter due to negative pressure during traditional injections, thus avoiding the risk of air embolism. It also prevents insufficient drug dosage from entering the blood vessel due to backflow, ensuring accurate delivery of the target dose, reducing waste caused by drug backflow, and eliminating the need for frequent backflow management, greatly ensuring the smoothness of the procedure.

[0022] The rectangular soft magnetic base and disposable magnetic adhesive pad work together to prevent the coronary angiography catheter from bending too much and damaging the blood vessels when fixed on the operating table. At the same time, placing it on the patient's arm allows the coronary angiography catheter to be inserted into the patient's arm artery more quickly and conveniently. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0024] Figure 2This is a three-dimensional schematic diagram of the positional relationship between the rectangular soft magnetic base and the fixing plate of the present invention;

[0025] Figure 3 This is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the structural section at point A in the middle;

[0027] Figure 5 This is an exploded view of the quick-change component structure of the present invention;

[0028] Figure 6 This is a three-dimensional schematic diagram of the fixed bracket and rectangular soft magnetic base structure of the present invention;

[0029] Figure 7 This is a three-dimensional schematic diagram of the positional relationship structure of the anti-sway component of the present invention;

[0030] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B;

[0031] Figure 9 This is a cross-sectional view of the anti-backflow component structure of the present invention;

[0032] Figure 10 This is a three-dimensional schematic diagram of the positional relationship between the fixed column, the second spring, and the third cylinder of the present invention.

[0033] The labels in the diagram represent:

[0034] 1. Rectangular soft magnetic base; 2. Fixing plate;

[0035] 3. Quick-change components; 301, First cylinder; 302, Circular hole; 303, Annular plate; 304, First spring; 305, Sphere; 306, Second cylinder; 307, Annular groove; 308, Sliding column; 309, Limiting plate;

[0036] 4. Coronary angiography catheter one; 5. Coronary angiography catheter two;

[0037] 6. Anti-sway assembly; 601. Fixed bracket; 602. Vertical limit post; 603. Two-way threaded rod; 604. Sliding block; 605. Connecting rod; 606. Arc plate; 607. Rotary knob;

[0038] 7. Anti-backflow assembly; 701. Ring; 702. Fixing column; 703. Second spring; 704. Third cylinder; 705. Sealing ring; 706. Frustum. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0040] Please see Figures 1 to 10 This invention provides an embodiment of a disposable coronary angiography catheter, including a rectangular soft magnetic base 1. In cases involving individuals with chest pain of unknown origin, asymptomatic individuals with ECG findings of myocardial ischemia, or high-risk individuals for coronary heart disease (such as those with a family history or metabolic syndrome), medical personnel need to insert the coronary angiography catheter by puncturing the radial or femoral artery. The catheter is selectively inserted into the openings of the left or right coronary arteries, and a contrast agent (such as iodine methylphenidate) is injected. The vascular morphology is visualized under X-ray to determine the degree of stenosis and the location of the lesion. A disposable magnetic patch is attached to the patient's arm, allowing the rectangular soft magnetic base 1 and the disposable magnetic patch to magnetically attract each other, facilitating placement on the patient's body and providing convenience for subsequent coronary angiography. A fixing plate 2 is fixedly installed on the top of the rectangular soft magnetic base 1, and a quick-change component 3 is provided on the top of the fixing plate 2. A coronary angiography catheter 4 is slidably connected to the side wall of the fixing plate 2.

[0041] Example 1:

[0042] The quick-change assembly 3 includes a first cylinder 301, which is fixedly mounted on the side wall of the fixing plate 2. Multiple circular holes 302 are arranged in a ring array on the first cylinder 301. An annular plate 303 is fixedly connected to the outer side of the first cylinder 301. A first spring 304 is fixedly connected to the side of the annular plate 303 near the circular holes 302. A ball 305 is slidably connected inside each circular hole 302. The quick-change assembly 3 also includes a second cylinder 306. The outer side of the coronary angiography catheter 4 is slidably connected to the first cylinder 301, and the outer side of the coronary angiography catheter 4 is fixedly connected to the second cylinder 306. The outer side of the second cylinder 306 is slidably connected to the first cylinder 301. An annular groove 307 is provided on the side, and the size of the annular groove 307 is adapted to the size of the ball 305. The ball 305 is located on the movement path of the circular hole 302. A limiting plate 309 is fixedly connected to the side of the first spring 304 away from the annular plate 303. The side of the limiting plate 309 away from the first spring 304 is set as an inclined surface, so as to facilitate the ball 305 to slide on the limiting plate 309 and avoid the ball 305 from being unable to slide on the circular hole 302 and getting stuck. A sliding column 308 is fixedly connected to the side of the limiting plate 309 away from the ball 305. The outer side of the sliding column 308 is set as a rough surface to increase the friction between the sliding column 308 and the medical staff wearing gloves, making it easier for the medical staff to hold the sliding column 308.

[0043] One end of the coronary angiography catheter 4 is threadedly connected to the coronary angiography catheter 5. The coronary angiography catheter 4 is the tail end of the coronary angiography catheter, and the coronary angiography catheter 5 is the front end of the coronary angiography catheter. The coronary angiography catheter 4 is made of polyetheretherketone (PEEK), which enables the coronary angiography catheter 4 to withstand greater compressive force without deformation, thus preventing the coronary angiography catheter 4 from being blocked by compressive force.

[0044] Example 2:

[0045] An anti-sway component 6 is provided on the top of the rectangular soft magnetic base 1. The anti-sway component 6 includes a fixed bracket 601, which is fixedly installed on the top of the rectangular soft magnetic base 1. The anti-sway component 6 also includes a vertical limiting post 602, which is fixedly connected to the inner wall of the fixed bracket 601. Sliding blocks 604 are symmetrically slidably connected to the outer side of the vertical limiting post 602. A bidirectional threaded rod 603 is fixedly connected to the inner wall of the fixed bracket 601. A connecting rod 60 is fixedly connected to the side wall of each sliding block 604. 5. The end of each sliding block 604 away from the vertical limiting post 602 is threadedly connected to the bidirectional threaded rod 603. The bidirectional threaded rod 603 has its vertical center as its axis, and the threads on both sides of its center are in opposite directions. The coronary angiography catheter 4 is located on the movement path of the two connecting rods 605. The end of each connecting rod 605 away from the sliding block 604 is fixedly connected to an arc plate 606. The top of the bidirectional threaded rod 603 is fixedly connected to a rotary knob 607, and the bottom of the rotary knob 607 is rotatably connected to the fixed bracket 601.

[0046] Example 3:

[0047] The coronary angiography catheter 4 is internally equipped with an anti-backflow component 7, which includes a ring 701 and a fixing post 702. The ring 701 is fixedly installed in the inner cavity of the coronary angiography catheter 4, and the fixing post 702 is fixedly installed in the inner cavity of the coronary angiography catheter 4. The anti-backflow component 7 also includes a second spring 703, which is fixedly installed on the side wall of the fixing post 702 near the ring 701. The end of the second spring 703 away from the fixing post 702 is fixedly connected to a third cylinder 704. The end of the ring 701 near the fixing post 702 is fixedly connected to a sealing ring 705, and the end of the third cylinder 704 away from the fixing post 702 is fixedly connected to a frustum 706. The inside of the ring 701 is slidably connected to the frustum 706, the fixing post 702 is slidably adapted to the inner cavity of the third cylinder 704, and the outside of the frustum 706 is slidably connected to the sealing ring 705.

[0048] The working principle of the above implementation is as follows:

[0049] The initialization steps are as follows:

[0050] Medical staff applied a disposable magnetic patch to the patient's wrist, and at the same time, they attached the rectangular soft magnetic base 1 to the disposable magnetic patch.

[0051] The operation steps are as follows:

[0052] The working steps of the anti-sway component 6 are as follows:

[0053] The medical staff slowly inserts the excessively long coronary angiography catheter 25 into the artery in the patient's arm. Once the tip of the catheter 25 is inside the patient's coronary artery, it allows the doctor to clearly observe the morphology and structure of the coronary artery, as well as any lesions such as stenosis or blockage, assisting in assessing coronary blood flow. At this point, the catheter 25 no longer needs to be moved. The medical staff then holds the rotating knob 607 and rotates it clockwise. This rotation causes the bidirectional threaded rod 603 to rotate clockwise simultaneously. The rotation causes the two sliding blocks 604 to rotate closer to the center of the bidirectional threaded rod 603. Since the sliding blocks 604 are limited in the vertical direction by the vertical limiting post 602, the two sliding blocks 604 move closer to the center of the bidirectional threaded rod 603 in the vertical direction. Both sliding blocks 604 slide on the vertical limiting post 602. Therefore, the two sliding blocks 604 drive the connecting rod 605 to move closer to the coronary angiography catheter 4. Similarly, the two connecting rods 605 drive the arc plate 606 to approach and abut against the outside of the coronary angiography catheter 4, thereby preventing the coronary angiography catheter 4 and the coronary angiography catheter 5 from shaking.

[0054] The anti-sloshing component 6 prevents errors in coronary angiography caused by catheter sloshing during the procedure, while also reducing damage to blood vessels caused by sloshing.

[0055] The working steps of the anti-backflow component are as follows:

[0056] When medical staff slowly insert the excessively long coronary angiography catheter 25 into the artery in the patient's arm, multiple medications such as contrast agent and anticoagulant need to be injected. Therefore, each time a different medication is injected, the medical staff must inject the medication into the end of the coronary angiography catheter 4 furthest from the coronary angiography catheter 25. When the medication is pushed by the injection force, it propels the frustum 706 towards the second spring 703. Simultaneously, the frustum 706 drives the third cylinder 704 to move towards the second spring 703 as well. Therefore, the third cylinder 704 compresses the second spring 703 and slides on it. Consequently, the frustum 706 gradually moves away from the ring 701, and the ring 701... The angiography catheter 4 is no longer sealed by the ring 701, so the medication enters the coronary angiography catheter 5 through the ring 701. At the same time, when the medication is no longer injected, the compressed second spring 703 is pushed by the elastic extension force to move the third cylinder 704 away from the fixing post 702. Therefore, the third cylinder 704 moves towards the ring 701. At the same time, the third cylinder 704 drives the frustum 706 to move towards the ring 701. Thus, the frustum 706 and the ring 701 seal the coronary angiography catheter 4 again. At the same time, the sealing ring 705 seals the gap between the frustum 706 and the ring 701, so the sealing ring 705 also plays an auxiliary sealing role.

[0057] After the coronary angiography of the patient's heart is completed, when the staff needs to remove the coronary angiography catheter 25, the staff rotates the rotary knob 607 counterclockwise. At this moment, the rotary knob 607 drives the bidirectional threaded rod 603 to rotate counterclockwise simultaneously. The rotation of the bidirectional threaded rod 603 causes the two sliding blocks 604 to rotate away from the center of the bidirectional threaded rod 603. Since the sliding blocks 604 are limited in the vertical direction by the vertical limiting post 602, the two sliding blocks 604 move away from the center of the bidirectional threaded rod 603 in the vertical direction. Both sliding blocks 604 slide on the vertical limiting post 602. Therefore, the two sliding blocks 604 drive the connecting rod 605 to move away from the coronary angiography catheter 4. Similarly, the two connecting rods 605 drive the arc plate 606 away from and no longer abut against the outside of the coronary angiography catheter 4.

[0058] The anti-backflow component 7 prevents air from being drawn into the catheter due to negative pressure during traditional injections, thus avoiding the risk of air embolism caused by air ingress. It also prevents insufficient drug dosage from entering the blood vessel due to backflow, ensuring accurate delivery of the target dose, reducing waste caused by drug backflow, and eliminating the need for frequent backflow management, greatly ensuring the smoothness of the procedure.

[0059] The steps for quickly replacing components are as follows:

[0060] Coronary angiography can visualize multiple vessels with a single puncture and catheter adjustment. However, when encountering abnormalities in the coronary artery ostium, such as an ostium that is too high, too low, or deviates from the center of the aortic sinus, it is necessary to change the catheter type. In this case, it is necessary to quickly change the type of coronary angiography catheter 25, i.e., change the size of coronary angiography catheter 25. At the same time, the medical staff holds the sliding column 308 and moves it towards the fixing plate 2. At this time, the sliding column 308 drives the limiting plate 309 towards the annular plate 303. Therefore, the limiting plate 309 compresses the first spring 304. When the side wall of the limiting plate 309 no longer abuts against the ball 305, the staff quickly withdraws the coronary angiography catheter 14. This causes the coronary angiography catheter 4 to slide the second cylinder 306 away from the annular plate 303 into the inner cavity of the first cylinder 301. Consequently, the second cylinder 306 causes the annular groove 307 on it to push the ball 305 towards the inclined surface of the limiting plate 309. As a result, the multiple balls 305 are no longer stuck in the annular groove 307, and the coronary angiography catheter 4 and the second cylinder 306 fall out into the first cylinder 301. At the same time, the staff can quickly reconnect the coronary angiography catheter 5 of another model to the coronary angiography catheter 4, and repeat the above work in reverse order. Therefore, it avoids the need to rearrange other repetitive work steps when it is necessary to replace the coronary angiography catheter 5 of a different model.

[0061] The quick-change component 3 avoids the need for repositioning when changing to different models of coronary angiography catheters, thus greatly shortening the time required for traditional coronary angiography catheter replacement and reducing the surgical risk for patients. At the same time, the single puncture point enables switching between multiple catheters, reducing the number of vascular punctures and further reducing the surgical risk for patients. It can also adapt to the surgical needs of different models of coronary angiography catheters, thereby improving the adaptability of the device.

[0062] The rectangular soft magnetic base 1, in conjunction with the disposable magnetic adhesive pad, allows the catheter to be placed on the patient's body. This design prevents excessive bending of the coronary angiography catheter 25 during fixation on the operating table, thus avoiding damage to the blood vessels. At the same time, placing it on the patient's arm allows the coronary angiography catheter 25 to be inserted into the patient's arm artery more quickly and conveniently.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A disposable coronary angiography catheter, comprising a rectangular soft magnetic base (1), wherein a fixing plate (2) is fixedly installed on the top of the rectangular soft magnetic base (1), characterized in that: The top of the fixing plate (2) is provided with a quick-change assembly (3), which includes a first cylinder (301). The first cylinder (301) is fixedly installed on the side wall of the fixing plate (2). A plurality of circular holes (302) are arranged in an annular array on the first cylinder (301). An annular plate (303) is fixedly connected to the outside of the first cylinder (301). A first spring (304) is fixedly connected to the side of the annular plate (303) near the circular hole (302). A ball (305) is slidably connected inside each of the circular holes (302). The sidewall of the fixation plate (2) is slidably connected to a coronary angiography catheter (4). The top of the rectangular soft magnetic base (1) is provided with an anti-sway component (6), the anti-sway component (6) includes a fixed bracket (601), the fixed bracket (601) is fixedly installed on the top of the rectangular soft magnetic base (1); The coronary angiography catheter (4) is provided with an anti-backflow component (7). The anti-backflow component (7) includes a ring (701) and a fixing post (702). The ring (701) is fixedly installed in the inner cavity of the coronary angiography catheter (4), and the fixing post (702) is fixedly installed in the inner cavity of the coronary angiography catheter (4). The quick-change assembly (3) also includes a second cylinder (306), the outer side of which is slidably connected to the first cylinder (301). An annular groove (307) is provided on the outer side of the second cylinder (306). A limiting plate (309) is fixedly connected to the side of the first spring (304) away from the annular plate (303). A sliding column (308) is fixedly connected to the side of the limiting plate (309) away from the sphere (305). The anti-backflow assembly (7) also includes a second spring (703), which is fixedly installed on the side wall of the fixed post (702) near the ring (701). The end of the second spring (703) away from the fixed post (702) is fixedly connected to a third cylinder (704). The end of the ring (701) near the fixed post (702) is fixedly connected to a sealing ring (705). The end of the third cylinder (704) away from the fixed post (702) is fixedly connected to a frustum (706).

2. The disposable coronary angiography catheter according to claim 1, characterized in that: One end of the coronary angiography catheter one (4) is threadedly connected to the coronary angiography catheter two (5), and the material of the coronary angiography catheter one (4) is polyetheretherketone.

3. The disposable coronary angiography catheter according to claim 1, characterized in that: The anti-sway assembly (6) also includes a vertical limiting post (602), which is fixedly connected to the inner wall of the fixed bracket (601). A sliding block (604) is symmetrically slidably connected to the outer side of the vertical limiting post (602). A bidirectional threaded rod (603) is fixedly connected to the inner wall of the fixed bracket (601). A connecting rod (605) is fixedly connected to the side wall of each sliding block (604). An arc plate (606) is fixedly connected to one end of each connecting rod (605) away from the sliding block (604). A rotary knob (607) is fixedly connected to the top of the bidirectional threaded rod (603).

4. The disposable coronary angiography catheter according to claim 1, characterized in that: The size of the annular groove (307) is adapted to the size of the sphere (305). The sphere (305) is located on the movement path of the circular hole (302). The outer side of the coronary angiography catheter (4) is slidably connected to the first cylinder (301), and the outer side of the coronary angiography catheter (4) is fixedly connected to the second cylinder (306).

5. The disposable coronary angiography catheter according to claim 3, characterized in that: Each of the sliding blocks (604) is threaded to a bidirectional threaded rod (603) at one end away from the vertical limiting post (602). The coronary angiography catheter (4) is located on the movement path of the two connecting rods (605). The bottom of the rotary knob (607) is rotatably connected to the fixed bracket (601).

6. The disposable coronary angiography catheter according to claim 1, characterized in that: The inner part of the ring (701) is slidably connected to the frustum (706), the fixed column (702) is slidably adapted to the inner cavity of the third cylinder (704), and the outer side of the frustum (706) is slidably connected to the sealing ring (705).

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