A leaf screening matching device for a biological valve

Abstract

The application relates to a leaf screening matching device of a biological valve, which comprises a support, a plurality of groups of movable pulley blocks arranged on the support, a pull rope arranged between the movable pulley blocks, one end of the pull rope being fixed with the support, the pull rope sequentially winding around the movable pulley blocks, the other end of the pull rope being connected with a counterweight, a connecting assembly for connecting the end of a valve leaf being arranged on the first movable pulley block, a positioning assembly for positioning the other end of the valve being arranged below the first movable pulley block, an electronic displacement sensing device being arranged at the position of the counterweight of the support, the electronic displacement sensing device being capable of detecting the displacement of the counterweight in real time and sending the detected data to a computer, and a screening matching program of the computer matching one group of three valve leaves according to preset screening and matching parameters. The application has the effects of accurately measuring the stretching length of the valve leaf, improving the screening precision, reducing the labor cost, reducing the subjectivity of manual matching, making the screening and matching of the valve leaf more objective and parameterized.

Description

Technical Field

[0001] This application relates to the technical field of biological valve leaflet screening and matching equipment, and in particular to a biological valve leaflet screening and matching device. Background Technology

[0002] Biological valves are heart valve substitutes made entirely or primarily of biological materials. The leaflets are mainly derived from porcine or bovine pericardium, which undergoes a series of special processing steps to create a structure that functions similarly to an autologous heart valve. A characteristic of these naturally derived leaflet materials is their poor homogeneity. Currently, tricuspid valves made using biomimetic principles are prone to valvular failure due to the poor uniformity of the three leaflets. Specifically, the failure mode is valvular regurgitation caused by the collapse of one or two leaflets. Therefore, the uniformity of the three leaflets of a valve under pressure or stress is particularly important.

[0003] When fabricating a bioprosthetic valve, three leaflets are required as a group to create one valve. This is because the three leaflets in the same group must have consistent deformation data under stress. However, during fabrication, a batch of leaflets are mixed together, making it difficult to select leaflets with deformation within the set range and to match three leaflets with good consistency. Therefore, leaflet screening and matching are necessary. Currently, a common screening method is to place the leaflets on a horizontal bar and observe their natural drooping and bending state for qualitative judgment. This method has poor objectivity, and the judgment criteria vary from person to person. Currently, the common screening and matching method involves suspending one end of the leaflet on a device with a scale, and suspending a weight on the other end. The leaflet will elongate under the force of the weight, and the degree of elongation can be quantitatively measured by the scale. Since the weight should not be too large, as this will damage the leaflet, the elongation of the leaflet under the weight is about 1-3 mm. The accuracy of the scale used for measurement is 0.5 mm, while the ideal elongation measurement accuracy is 0.1 mm or 0.05 mm. This results in low judgment accuracy and makes it difficult to select three leaflets with similar deformation to form a group. Utility Model Content

[0004] In order to accurately measure the elongation length of the leaflets, improve screening accuracy, reduce labor costs, reduce the subjectivity of human matching, and make the screening and matching of leaflets more objective and parameterized, this application provides a leaflet screening and matching device for biological valves.

[0005] The leaflet screening and matching device for a biological valve provided in this application adopts the following technical solution: A bioprosthetic valve leaflet screening and matching device, characterized in that: it includes a support, on which multiple sets of movable pulleys are arranged, and a pull rope is arranged between the movable pulleys. One end of the pull rope is fixed to the support, and the pull rope passes around the movable pulleys in sequence. The other end of the pull rope is connected to a counterweight. A connecting component is arranged on the movable pulley of the first movable pulley group for connecting the end of the leaflet. A positioning component is arranged below the first movable pulley group on the support for positioning the other end of the valve. Under the gravity of the counterweight, the pull rope drives the movable pulleys to slide, and the sliding of the movable pulleys stretches the leaflet.

[0006] By adopting the above technical solution, when the user uses the valve, one end of the leaflet is fixed to the positioning component, and the other end is fixed to the connecting component. Under the action of gravity, the counterweight pulls the movable pulley system. By using the same counterweight, the leaflet is stretched. Multiple sets of movable pulley systems can amplify the displacement by multiple times. By measuring the displacement of the counterweight, the deformation of the leaflet can be calculated. The displacement of the counterweight is N times the displacement of the leaflet. The displacement of the counterweight can be seen visually or measured with measuring tools such as calipers. Finally, three leaflets with similar displacement are selected as a group of biological valves.

[0007] A bioprosthetic valve leaflet screening and matching device is characterized by comprising: a support, a connecting component on the support for fixing the end of the leaflet to achieve leaflet suspension, a counterweight connected to the leaflet, and an electronic displacement sensor on the support, which can detect the deformation of the leaflet under the gravity of the counterweight in real time and send the detected data to a computer. The computer's screening and matching program performs a matching of a set of three leaflets according to preset screening and matching parameters.

[0008] By adopting the above technical solution, when the user uses the device, one end of the leaflet is fixed to the positioning component, so that the leaflet is suspended on the positioning component. The leaflet is stretched and deformed under the gravity of the counterweight. The electronic displacement sensing device can detect the deformation of the leaflet under its own gravity in real time, and then send the detected data to the computer. The computer's screening and matching program performs a set of 3 leaflets matching according to the preset screening and matching parameters.

[0009] A bioprosthetic valve leaflet screening and matching device includes a support frame with multiple sets of movable pulleys. A pull rope is connected between the movable pulley sets, with one end of the rope fixed to the support frame. The rope passes sequentially around the movable pulley sets, and the other end of the rope is connected to a counterweight. A connecting component is provided on the first movable pulley set for connecting the end of the leaflet. A positioning component is located below the first movable pulley set on the support frame for positioning the other end of the valve. An electronic displacement sensor is positioned on the support frame corresponding to the counterweight, capable of detecting the displacement of the counterweight in real time and sending the detected data to a computer. The computer's screening and matching program performs a matching of three leaflets according to preset screening and matching parameters.

[0010] By adopting the above technical solution, during user operation, one end of the leaflet is fixed to the positioning component, and the other end is fixed to the connecting component. Under the action of gravity, the counterweight pulls the movable pulley system. By using the same counterweight, the leaflet is stretched. Multiple sets of movable pulleys can amplify the displacement by multiple times. By measuring the displacement of the counterweight, the deformation of the leaflet can be calculated. The displacement of the counterweight is N times the displacement of the leaflet (N represents the number of rope segments attached to the movable pulley). The pulley system can amplify the displacement of the leaflet, thereby accurately measuring the stretched length of the leaflet, improving the screening accuracy, reducing labor costs, and reducing the subjectivity of human matching. This makes the screening and matching of leaflets more objective and parameterized. Moreover, the orderly feeding of the automatic feeding component facilitates the orderly feeding of leaflets after numbering. The electronic displacement sensor sequentially sends the deformation of each leaflet to the computer. The computer processing unit can record and screen the deformation of the leaflets, making it easy for staff to quickly and intuitively select suitable leaflets, greatly improving work efficiency.

[0011] Optionally, each set of movable pulleys includes two support rods fixed to the top wall of the test box. The support rods form a guide channel, which is vertically arranged. A movable pulley is installed in the guide channel. A connecting rod is installed on the top wall of the test box, and a fixed pulley is rotatably connected to the connecting rod. The pull rope passes around the bottom of the movable pulley and the top of the fixed pulley in sequence.

[0012] By adopting the above technical solution, when the user uses the device, the counterweight slides downward under the action of gravity, and then drives the movable pulley to slide by stretching, thereby stretching the leaflets.

[0013] Optionally, the connecting assembly includes a connecting seat rotatably connected to a movable pulley. The bottom of the connecting seat is provided with two positioning plates. The positioning plates are provided with plug-in pins, and connecting pins are connected to the plug-in pins. The connecting pins and plug-in pins are arranged in parallel. The positioning plates are provided with through holes for the plug-in pins and positioning pins to pass through. One end of the connecting pin extends out of the positioning plate and is fixedly connected to a limiting head. A spring is sleeved on the part of the connecting pin extending out of the positioning plate. The two ends of the spring are fixed to the limiting head and the positioning plate, respectively. The two ends of the leaf are provided with through holes, and the plug-in pin is used to pass through the through holes of the leaf.

[0014] By adopting the above technical solution, when the user uses the device, pushing the limiting head will push the connecting post and the plug post, causing the end of the plug post to separate from the positioning plate, extending the perforation of the leaflet to between the two limiting plates. When the limiting head is released, the tension of the spring will cause the connecting post and the plug post to reset, and the plug post will penetrate into the perforation to limit the end of the leaflet.

[0015] Optionally, the support rod is provided with a guide groove, and the connecting seat is provided with a guide block, which is slidably connected in the guide groove.

[0016] By adopting the above technical solution, if the pulley position is offset during use, it will disrupt the symmetrical force state, causing uneven tension distribution. The pulley is prone to lateral offset or rotation, resulting in misalignment between the pulley groove and the rope, reducing rope wear or even derailment. In severe cases, it may cause mechanical failure or safety accidents. The guide block slides in the guide groove, which plays a guiding and limiting role on the moving pulley, reducing the offset of the moving pulley.

[0017] Optionally, the positioning component includes a positioning frame, a positioning rod is provided on the positioning frame, the positioning frame is fixedly connected to the bracket, and a pin is provided on the positioning rod for insertion into the perforation of the leaflet.

[0018] By adopting the above technical solution, when the user uses the product, the perforation of the leaflet is inserted into the pin, which can fix one end of the leaflet.

[0019] Optionally, the positioning rod is slidably connected to the positioning frame, and the positioning frame is threaded with bolts that fix the positioning rod and the positioning frame.

[0020] By adopting the above technical solution, users can adjust the height of the positioning rod by loosening the bolts, which can accommodate different sizes of leaflets and fix leaflets of different sizes.

[0021] Optionally, the bracket is provided with an automatic ejector assembly at the position corresponding to the counterweight; the automatic ejector assembly includes a fixed rod fixedly connected to the detection box, a support plate slidably connected to the fixed rod, the support plate being used to abut against the bottom of the counterweight, and a drive assembly for driving the support plate to slide vertically connected to the fixed rod.

[0022] By adopting the above technical solution, when the user uses the device, the drive component drives the support plate to move vertically. The support plate abuts against the bottom of the counterweight block, lifting the counterweight block and preventing it from pulling the pull rope downwards during the installation of the leaflets. During the testing process, the drive component drives the support plate to move downwards, the pressure of the support plate on the counterweight block disappears, and the counterweight block pulls the pull rope under its own weight, thereby achieving the same gravity to perform tensile testing on the leaflets. This also facilitates the installation of the leaflets and the movable pulley.

[0023] Optionally, the fixed rod is provided with a sliding groove, and the driving assembly includes a screw rod rotatably connected to the side wall of the fixed rod. A support plate is threaded onto the screw rod, and the support plate passes through the sliding groove and abuts against the bottom of the counterweight. A drive motor is fixedly connected to the fixed rod, and the output shaft of the drive motor is fixed to the screw rod.

[0024] By adopting the above technical solution, when the user uses the drive motor to drive the screw to rotate, it can drive the support plate to slide vertically, thereby lifting the counterweight away, which facilitates the disassembly and installation of the leaflets, and also facilitates the automatic tensile test of the leaflets.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up multiple sets of connected movable pulleys, the displacement of the leaflets can be amplified, thereby accurately measuring the tensile length of the leaflets, improving screening accuracy, reducing labor costs, reducing the subjectivity of human matching, and making the screening and matching of leaflets more objective and parameterized. Attached Figure Description

[0026] Figure 1 These are schematic diagrams of the overall structure of Embodiments 1 and 3 of this application; Figure 2 These are cross-sectional views of Embodiments 1 and 3 of this application; Figure 3 yes Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Bracket; 2. Movable pulley block; 21. Support rod; 22. Movable pulley; 221. Guide groove; 23. Connecting rod; 24. Fixed pulley; 3. Pull rope; 4. Counterweight block; 41. Automatic feeding assembly; 411. Fixed rod; 412. Sliding groove; 413. Screw; 414. Drive motor; 42. Support plate; 5. Connecting assembly; 51. Connecting seat; 511. Guide block; 52. Positioning plate; 521. Through hole; 53. Insertion post; 54. Connecting post; 55. Limiting head; 56. Spring; 6. Positioning assembly; 61. Positioning frame; 62. Positioning rod; 63. Pin; 7. Electronic displacement sensor; 8. Leaflet; 81. Perforation. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0031] Example 1 Embodiment 1 of this application discloses a leaflet screening and matching device for biological valves, referring to... Figure 1 , Figure 2 and Figure 3 The device includes a support frame 1, multiple sets of movable pulleys 2, a rope 3, a counterweight 4, a connecting component 5, and a positioning component 6. The support frame 1 provides the foundation for the entire device. The movable pulleys 2 are mounted on the support frame 1. The rope 3 passes through the movable pulleys 2 sequentially, with one end fixed to the support frame 1 and the other end connected to the counterweight 4. The connecting component 5 is mounted on the first movable pulley set 2. Perforations 81 are fixedly connected to both ends of the leaf 8. The positioning component 6 is located on the support frame 1 below the first movable pulley set 2. The connecting component 5 and the positioning component 6 are used to connect to the perforations 81 of the leaf 8. The counterweight 4 slides downwards under gravity, pulling the movable pulleys 2 and stretching the leaf. The displacement of the leaf is amplified by the movable pulleys, making it easy to observe the displacement of the counterweight visually or to measure it using measuring tools. By stretching the leaf 8 with the same counterweight 4, the stretching length of the leaf 8 can be accurately measured.

[0032] Specifically, the movable pulley assembly 2 includes two support rods 21 fixed to the top wall of the testing chamber and a movable pulley 22, as well as a connecting rod 23 and a fixed pulley 24. The support rods 21 are fixed to the top wall of the testing chamber, forming a vertical guide channel. The support rods 21 are typically made of metal, such as stainless steel, which has high strength and corrosion resistance. The movable pulley 22 is located within the guide channel and can slide up and down along it. The movable pulley 22 is generally circular, and the groove surface is polished to reduce friction between the pull rope 3 and the movable pulley 22. The connecting rod 23 is also fixed to the top wall of the testing chamber, and the fixed pulley 24 is rotatably connected to the connecting rod 23. The connecting rod 23 can be made of solid steel to ensure its stability. The size of the fixed pulley 24 must be adapted to the thickness of the pull rope 3 and the specifications of the movable pulley 22. The pull rope 3 passes sequentially around the bottom of the movable pulley 22 and the top of the fixed pulley 24. When the counterweight 4 pulls the pull rope 3 under the action of gravity, the movable pulley 22 slides in the guide channel, and the fixed pulley 24 changes the direction of the pull rope 3. The combination of the movable pulley 22 and the fixed pulley 24 amplifies the displacement. By stretching the leaflet 8 through the same counterweight 4, the stretching length of the leaflet 8 can be accurately measured.

[0033] The movable pulley group 2 shown in the figure is a group, but it is not limited to one group of movable pulley groups 2. Different numbers of movable pulley groups 2 can be connected according to the needs to amplify the tensile displacement of the leaf 8 multiple times.

[0034] Specifically, the connecting assembly 5 includes a connecting seat 51 rotatably connected to the movable pulley 22, two positioning plates 52, a plug-in post 53, a connecting post 54, a limiting head 55, and a spring 56. The connecting seat 51 is rotatably connected to the movable pulley 22, and can be connected by bearings to ensure that the connecting seat 51 can rotate flexibly. The connecting seat 51 is generally block-shaped, and the material can be plastic or light metal to reduce the overall weight. The positioning plate 52 is located at the bottom of the connecting seat 51. The positioning plate 52 is usually rectangular and made of metal, such as iron or aluminum. The positioning plate 52 has a through hole 521 for the plug-in post 53 and the connecting post 54 to pass through. The diameter of the through hole 521 must be precisely designed according to the outer diameter of the plug-in post 53 and the connecting post 54 to ensure that they can pass through smoothly. The plug-in post 53 is used to penetrate into the perforation 81 of the leaflet 8. The head of the plug-in post 53 can be designed as a cone shape to facilitate insertion into the perforation 81 of the leaflet 8. The connecting post 54 and the insertion post 53 are arranged parallel to each other. One end of the connecting post 54 extends out of the positioning plate 52 and is fixedly connected to the limiting head 55. The function of the limiting head 55 is to prevent the spring 56 from falling off and to facilitate the operator to push the connecting post 54. The spring 56 is sleeved on the part of the connecting post 54 that extends out of the positioning plate 52, and its two ends are fixed to the limiting head 55 and the positioning plate 52 respectively. When the limiting head 55 is pushed, the spring 56 is compressed, and the end of the insertion post 53 is disengaged from the positioning plate 52, so that the perforation 81 of the leaflet 8 can be placed between the two positioning plates 52. When the limiting head 55 is released, the tension of the spring 56 causes the connecting post 54 and the insertion post 53 to return to their original positions, and the insertion post 53 passes through the perforation 81 to achieve the limiting of the end of the leaflet 8.

[0035] Specifically, the positioning component 6 includes a positioning frame 61, a positioning rod 62, and a pin 63. The positioning frame 61 is fixedly connected to the bracket 1, and can be fixed to the bracket 1 by welding or bolting. The positioning rod 62 is slidably connected to the positioning frame 61. The positioning rod 62 can be a square rod with a polished surface to reduce friction with the positioning frame 61. The pin 63 is provided on the positioning rod 62 and is used to insert into the through hole 81 of the leaflet 8. The diameter of the pin 63 must be compatible with the through hole 81 of the leaflet 8 to ensure stable positioning of the leaflet 8. The positioning frame 61 is threaded with bolts. Loosening the bolts allows adjustment of the height of the positioning rod 62 to accommodate leaflets 8 of different sizes, thus achieving fixation of leaflets 8 of different sizes.

[0036] An automatic ejector assembly 41 is installed on the bracket 1 at the position corresponding to the counterweight 4. The automatic ejector assembly 41 includes a fixed rod 411 and a support plate 42 fixedly connected inside the detection box. The fixed rod 411 has a sliding groove 412, and a screw 413 is rotatably connected to the side wall of the fixed rod 411. The support plate 42 is threadedly connected to the screw 413. A drive motor 414 is fixedly connected to the fixed rod 411, and the output shaft of the drive motor 414 is fixed to the screw 413. A notch is provided on the fixed rod 411, and the support plate 42 passes through the notch and abuts against the bottom of the counterweight 4. When installing the leaflet 8, the drive motor 414 drives the screw 413 to rotate, causing the support plate 42 to move upward and abut against the bottom of the counterweight 4, lifting it up and preventing the counterweight 4 from driving the pull rope 3 downward, thus facilitating the installation of the leaflet 8 and the movable pulley 22. During testing, the drive motor 414 drives the screw 413 to rotate in the opposite direction, causing the support plate 42 to move downwards. This removes the pressure on the counterweight 4, and the counterweight 4, under its own weight, pulls the rope 3, achieving the same gravitational force for tensile testing of the leaf 8. This automatic feeding assembly 41 makes the installation and testing of the leaf 8 more convenient, further improving work efficiency.

[0037] The implementation principle of this embodiment is as follows: the device amplifies the displacement of the leaflet 8 through multiple sets of movable pulleys 2, observes the displacement of the counterweight 4 with the naked eye, or measures the displacement of the counterweight 4 with a measuring tool, thereby obtaining the deformation of the leaflet 8. Finally, based on the recording and screening of the deformation of the leaflet 8, the three leaflets 8 with the closest displacement are selected to form a set of biological valves.

[0038] Example 2 Reference Figure 4 Embodiment 2 of this application discloses a leaflet screening and matching device for biological valves, including a stator displacement sensing device 7, which is mainly used to detect the stretching distance of the leaflets 8. The leaflets 8 are suspended, and a counterweight 4 is connected to the leaflets 8 so that the leaflets 8 are stretched under the gravity of the counterweight 4. The electronic displacement sensing device 7 is used to detect the amount of stretching displacement of the leaflets 8 and send the detected displacement to the computer. The computer performs a screening and matching program to match a group of 3 leaflets 8. This setup achieves the effects of accurately measuring the stretching length of the leaflets 8, improving screening accuracy, reducing labor costs, and reducing the subjectivity of human matching.

[0039] Specifically, the electronic displacement sensing device 7 can be a high-precision sensor such as a laser displacement sensor, capacitive displacement sensor, potentiometer displacement sensor, ultrasonic displacement sensor, Hall effect displacement sensor, or inductive displacement sensor, all of which are sensor types capable of accurately detecting millimeter-level displacement. Laser displacement sensors measure distance using the principle of laser reflection, featuring high precision and high speed. Capacitive displacement sensors measure displacement by detecting changes in capacitance, making them highly sensitive to minute displacements. The electronic displacement sensing device 7 sends the detected displacement data of the counterweight 4 to a computer, where a screening and matching program filters and matches the leaflets 8 according to preset parameters.

[0040] The implementation principle of this embodiment is as follows: the leaflet 8 is suspended and stretched under the gravity of the counterweight. The displacement of the stretched leaflet is accurately measured by the electronic displacement sensor 7, thereby calculating the deformation of the leaflet 8. The computer records and filters the deformation of the leaflet 8, realizing the objectivity and parameterization of leaflet 8 screening and matching.

[0041] Example 3 Looking back Figure 1 , Figure 2 and Figure 3 Embodiment 3 of this application discloses a leaflet screening and matching device for biological valves. The electronic displacement sensor device 7 of Embodiment 2 is applied to Embodiment 1. The displacement of the leaflet 8 is amplified by multiple sets of movable pulleys 2. The displacement of the counterweight 4 is measured by the electronic displacement sensor device 7 and the detected displacement is sent to the computer. The computer can accurately calculate the deformation of the leaflet 8. The computer performs a matching of a group of 3 leaflets 8 through the screening and matching program.

[0042] The implementation principle of this embodiment is as follows: the displacement of the leaflet 8 is amplified by multiple sets of movable pulleys 2, and the displacement of the counterweight 4 is accurately measured by the electronic displacement sensor 7, thereby calculating the deformation of the leaflet 8. The computer records and filters the deformation of the leaflet 8, realizing the objectivity and parameterization of leaflet 8 screening and matching. Compared with traditional screening methods, this improves screening accuracy, reduces labor costs and the subjectivity of human matching, greatly improves work efficiency, and provides a more scientific and accurate method for screening and matching biological valve leaflets 8.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A leaflet screening and matching device for a biological valve, characterized in that: The device includes a support (1), on which multiple sets of movable pulley groups (2) are provided. A pull rope (3) is provided between the movable pulley groups (2). One end of the pull rope (3) is fixed to the support (1). The pull rope (3) passes around the movable pulley groups (2) in sequence. The other end of the pull rope (3) is connected to a counterweight (4). A connecting component (5) is provided on the movable pulley (22) of the first movable pulley group (2). The connecting component (5) is used to connect the end of the leaflet (8). A positioning component (6) is provided below the first movable pulley group (2) on the support (1). The positioning component (6) is used to position the other end of the valve. The pull rope (3) drives the movable pulley group (2) to slide under the gravity of the counterweight (4). The sliding of the movable pulley group (2) stretches the leaflet (8).

2. The leaflet screening and matching device for a biological valve according to claim 1, characterized in that: The positioning component (6) includes a positioning frame (61), a positioning rod (62) is provided on the positioning frame (61), the positioning frame (61) is fixedly connected to the bracket (1), and a pin (63) is provided on the positioning rod (62), which is used to be inserted into the perforation (81) of the leaf (8).

3. The leaflet screening and matching device for a biological valve according to claim 2, characterized in that: The positioning rod (62) is slidably connected to the positioning frame (61), and the positioning frame (61) is threaded with bolts that fix the positioning rod (62) and the positioning frame (61).

4. The leaflet screening and matching device for a biological valve according to claim 1, characterized in that: The bracket (1) is equipped with an automatic feeding component (41) at the position corresponding to the counterweight (4); The automatic feeding assembly (41) includes a fixed rod (411) fixedly connected to the detection box, a support plate (42) slidably connected to the fixed rod (411), the support plate (42) is used to abut against the bottom of the counterweight (4), and a driving assembly for driving the support plate (42) to slide vertically is connected to the fixed rod (411).

5. The leaflet screening and matching device for a biological valve according to claim 4, characterized in that: The fixed rod (411) is provided with a sliding groove (412). The driving assembly includes a screw (413) rotatably connected to the side wall of the fixed rod (411). A support plate (42) is threaded onto the screw (413). The support plate (42) passes through the sliding groove (412) and abuts against the bottom of the counterweight (4). A drive motor (414) is fixedly connected to the fixed rod (411). The output shaft of the drive motor (414) is fixed to the screw (413).

6. A leaflet screening and matching device for a biological valve, characterized in that: Includes a bracket (1), on which a connecting component (5) is provided. The connecting component (5) is used to fix the end of the leaflet (8) to realize the suspension of the leaflet (8). A counterweight (4) is connected to the leaflet (8). An electronic displacement sensor (7) is provided on the bracket (1). The electronic displacement sensor (7) can detect the deformation of the leaflet (8) under the action of gravity in real time and send the detected data to the computer. The computer's screening and matching program matches a set of 3 leaflets (8) according to the preset screening and matching parameters.

7. A leaflet screening and matching device for a biological valve, characterized in that: The system includes a support (1), on which multiple sets of movable pulley groups (2) are provided. A pull rope (3) is provided between the movable pulley groups (2). One end of the pull rope (3) is fixed to the support (1). The pull rope (3) passes around the movable pulley groups (2) in sequence. The other end of the pull rope (3) is connected to a counterweight (4). A connecting component (5) is provided on the movable pulley (22) of the first movable pulley group (2). The connecting component (5) is used to connect the end of the leaflet (8). A positioning component (6) is provided below the first movable pulley group (2) on the support (1). The positioning component (6) is used to position the other end of the valve. An electronic displacement sensor (7) is provided on the support (1) at the position corresponding to the counterweight (4). The electronic displacement sensor (7) can detect the displacement of the counterweight (4) in real time and send the detected data to the computer. The computer's screening and matching program matches a set of 3 leaflets (8) according to the preset screening and matching parameters.

8. The leaflet screening and matching device for a biological valve according to claim 7, characterized in that: Each set of movable pulleys (2) includes two support rods (21) fixed to the top wall of the test box. The support rods (21) form a guide channel. The guide channel is set vertically and a movable pulley (22) is set in the guide channel. A connecting rod (23) is set on the top wall of the test box. A fixed pulley (24) is rotatably connected to the connecting rod (23). The pull rope (3) passes around the bottom of the movable pulley (22) and the top of the fixed pulley (24) in sequence.

9. The leaflet screening and matching device for a biological valve according to claim 8, characterized in that: The support rod (21) is provided with a guide groove (221), and the connecting seat (51) is provided with a guide block (511), which is slidably connected in the guide groove (221).

10. A leaflet screening and matching device for a biological valve according to claim 1, 6, or 7, characterized in that: The connecting assembly (5) includes a connecting seat (51) rotatably connected to a movable pulley (22). Two positioning plates (52) are provided at the bottom of the connecting seat (51). A plug-in post (53) is provided on the positioning plate (52). A connecting post (54) is connected to the plug-in post (53). The connecting post (54) and the plug-in post (53) are arranged in parallel. A through hole (521) is provided on the positioning plate (52) for the plug-in post (53) and the positioning post to pass through. One end of the connecting post (54) extends out of the positioning plate (52) and is fixedly connected to a limiting head (55). A spring (56) is sleeved on the part of the connecting post (54) that extends out of the positioning plate (52). The two ends of the spring (56) are fixed to the limiting head (55) and the positioning plate (52) respectively. A through hole (81) is provided at both ends of the leaf (8). The plug-in post (53) is used to pass through the through hole (81) of the leaf (8).

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