Bending test device and bending test method for medical pipe fitting

Abstract

The invention relates to a bending test device and a bending test method for a medical pipe fitting. The bending test device comprises a base, a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism, the first adjusting mechanism is arranged on the first side part and comprises a first clamping piece; the second adjusting mechanism is arranged on the second side part and comprises a second clamping piece; the third adjusting mechanism is arranged in the middle and comprises a third clamping piece; in the first direction, the third clamping piece is located between the first clamping piece and the second clamping piece, at least one of the first clamping piece, the second clamping piece and the third clamping piece can move in the first direction, and at least two of the first clamping piece, the second clamping piece and the third clamping piece can independently move in the second direction; the first clamping piece, the second clamping piece and the third clamping piece are each provided with a clamping cavity used for allowing a medical pipe fitting to be inserted and used for clamping a hose, and the central axis of the clamping cavity of at least one of the first clamping piece, the second clamping piece and the third clamping piece is parallel to the first direction. The second direction intersects the first direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a bending test device and a bending test method for a medical tube. BACKGROUND

[0002] Sheath tubes are commonly used in minimally invasive surgery (such as cardiovascular or interventional radiology) as a passageway for catheters or other medical devices to enter blood vessels. In actual operation, the sheath tube needs to be inserted into the curved blood vessels of the human body. If its bending resistance does not meet the requirements, it may not be able to reach the lesion site smoothly, increase the operation difficulty, prolong the operation time, and even damage the surrounding tissues. Therefore, preoperative bending performance test of the sheath tube is crucial. However, the existing ordinary tube bending test device cannot meet the bending test requirements of the sheath tube. SUMMARY

[0003] Therefore, it is necessary to provide a bending test device and a bending test method for a medical tube to solve the above technical problems.

[0004] In a first aspect, the present application provides a bending test device for a medical tube, comprising a base, a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism, the first adjusting mechanism comprising a first clamping piece, the second adjusting mechanism comprising a second clamping piece, and the third adjusting mechanism comprising a third clamping piece, the third clamping piece being located between the first clamping piece and the second clamping piece along a first direction, at least one of the first clamping piece, the second clamping piece and the third clamping piece being movable along the first direction, and at least two of them being independently movable along a second direction, the second direction intersecting the first direction, wherein the first clamping piece, the second clamping piece and the third clamping piece each have a clamping cavity for clamping a flexible tube for inserting the medical tube, and the center axis of the clamping cavity of at least one of the first clamping piece, the second clamping piece and the third clamping piece is parallel to the first direction.

[0005] Further, the bending test device has at least one of the following characteristics:

[0006] The center axes of the clamping cavities of the first clamping piece, the second clamping piece and the third clamping piece are all parallel to the first direction, and the center axes of the clamping cavities of the first clamping piece, the second clamping piece and the third clamping piece can coincide;

[0007] The first direction is perpendicular to the second direction;

[0008] The first clamping piece and the second clamping piece are independently movable along the first direction, and the first clamping piece, the second clamping piece and the third clamping piece are independently movable along the second direction;

[0009] At least one of the first clamping member, the second clamping member and the third clamping member is also movable along a third direction, the third direction being perpendicular to the first direction and the second direction.

[0010] Further, at least one of the first clamping member, the second clamping member and the third clamping member has the following technical features: comprising a clamping body, a clamping cavity being formed in the clamping body along the first direction, and a slit being formed in the clamping body and communicating with the clamping cavity, the slit penetrating through the clamping body along a direction perpendicular to the first direction.

[0011] Further, the bending test device has at least one of the following features:

[0012] The first clamping member, the second clamping member and the third clamping member having the slit are target clamping members, and the target clamping members are made of nylon material;

[0013] The clamping body is elastic, and a clamping slot is further formed in the clamping body and communicates with the clamping cavity, and the clamping slot is arranged opposite to the slit.

[0014] Further, the third clamping member has the following technical features: comprising a clamping body, a first extension, a second extension and an adjusting member, the first extension and the second extension are fixedly connected to the outer side of the clamping body and arranged opposite to each other, and the gap between the first extension and the second extension communicates with the slit; the adjusting member is connected to the first extension and the second extension, and the adjusting member can adjust the size of the gap between the first extension and the second extension, so as to adjust the size of the clamping cavity of the third clamping member.

[0015] Further, a first threaded hole is formed in the first extension, and a second threaded hole is formed in the second extension; the adjusting member has threads, the adjusting member is arranged in the first threaded hole and the second threaded hole, and the adjusting member is threadedly connected to the first threaded hole and the second threaded hole to adjust the gap between the first extension and the second extension.

[0016] Alternatively, a first through hole is formed in the first extension, and a second through hole is formed in the second extension, the adjusting member comprises a stud and a nut, the stud is arranged in the first through hole and the second through hole, and the nut is sleeved on the stud, the nut is threadedly connected to the stud to adjust the gap between the first extension and the second extension.

[0017] Further, the third clamping member further comprises a clamping body, the clamping body has opposite inlet end and outlet end, the clamping cavity communicates with the inlet end and the outlet end, and the size of the clamping cavity gradually decreases from the inlet end to the outlet end.

[0018] Further, at least one of the first adjusting mechanism, the second adjusting mechanism and the third adjusting mechanism comprises a track, a moving table and a transmission assembly, the track extends along the first direction or the second direction, the moving table is movable along the track, the corresponding clamping member is connected with the moving table, and the transmission assembly is capable of driving the moving table to move along the track.

[0019] The transmission assembly comprises a rack, a gear and an operation part, the rack is protruded on the track base and extends along the extension direction of the track, the gear is rotatably arranged on the moving table, the gear is engaged with the rack, the operation part is fixedly connected with the gear, and the operation part is rotatable to drive the gear to rotate and drive the moving table to move on the track.

[0020] In a second aspect, the present application provides a bending test device for a medical tube, comprising a base, a first adjusting mechanism, a second adjusting mechanism, a third adjusting mechanism and a hose, the first adjusting mechanism comprises a first clamping member, the second adjusting mechanism comprises a second clamping member, the third adjusting mechanism comprises a third clamping member, along the first direction, the third clamping member is located between the first clamping member and the second clamping member, at least one of the first clamping member, the second clamping member and the third clamping member is movable along the first direction, and at least two of them are movable along the second direction respectively, the second direction intersects with the first direction, wherein the first clamping member, the second clamping member and the third clamping member all have clamping cavities for clamping the hose, the center axis of the clamping cavity of at least one of the first clamping member, the second clamping member and the third clamping member is parallel to the first direction, and the hose is capable of being inserted with the medical tube.

[0021] In a third aspect, the present application provides a bending test method for a medical tube, comprising:

[0022] Providing the bending test device as described above, and inserting the hose into the clamping cavities of the first clamping member, the second clamping member and the third clamping member, so that the hose is clamped in the clamping cavities of the first clamping member, the second clamping member and the third clamping member;

[0023] Adjusting the position of at least one of the first clamping member, the second clamping member and the third clamping member, so that the hose presents a preset bending shape;

[0024] Inserting the medical tube with the dilator into the hose;

[0025] Pulling out the dilator;

[0026] The adjustment of the position of at least one of the first clamping member, the second clamping member and the third clamping member comprises adjusting the position of each of the at least one of the first clamping member, the second clamping member and the third clamping member along the first direction, and / or independently adjusting the position of at least two of the first clamping member, the second clamping member and the third clamping member along the second direction.

[0027] In the present application, the first clamping piece, the second clamping piece and the third clamping piece have clamping cavities for clamping the hose, at least one of the first clamping piece, the second clamping piece and the third clamping piece can move in the first direction, the center axis of the clamping cavity of at least one of the first clamping piece, the second clamping piece and the third clamping piece is parallel to the first direction, and at least two of the first clamping piece, the second clamping piece and the third clamping piece can independently move in the second direction, the second direction intersects the first direction. Compared with the bending test device in which only one of the first clamping piece, the second clamping piece and the third clamping piece can move in the second direction or only two of them can move in the second direction synchronously, in the present application, the clamping cavities of the first clamping piece, the second clamping piece and the third clamping piece clamp the hose, which can make the hose present more bending shapes, so as to simulate more kinds of bending shapes close to human blood vessels, and more favorably test the bending performance of the medical tube inserted into the human blood vessels.

[0028] In addition, compared with the existing ordinary pipe bending test method, the first clamping piece, the second clamping piece and the third clamping piece of the bending test device provided in the present application do not directly clamp the medical tube, but first clamp the hose through the first clamping piece, the second clamping piece and the third clamping piece, and adjust the positions of the first clamping piece, the second clamping piece and the third clamping piece to bend the hose into a preset shape, so as to simulate the bending shape of the human blood vessels, and then insert the medical tube into the hose to observe whether the medical tube is bent in the hose, so as to determine the limit condition of the bending of the medical tube. Since the medical tube needs to be inserted into the human blood vessels in the minimally invasive surgery, the bending performance of the medical tube is tested by simulating the bending shape of the human blood vessels through the hose and then inserting the medical tube into the hose, which is closer to the actual application scene, and the test result is more referable to the actual application scene. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The present application provides a medical device bending test device.

[0030] Figure 2 The present application provides a medical device bending test device.

[0031] Figures 3-7 The present application provides a medical device bending test device.

[0032] Figure 8 The present application provides a medical device bending test device. Figure 1 The present application provides a medical device bending test device.

[0033] Figure 9 The present application provides a medical device bending test device.

[0034] Figure 10 An exploded view of a first adjusting mechanism of a bending test device according to an embodiment of the present application.

[0035] Figure 11 A structure view of a first moving platform of the first adjusting mechanism. Figure 10

[0036] Figure 12 A structure view of a receiving groove according to an embodiment of the present application.

[0037] Figure 13 A structure view of a receiving groove according to another embodiment of the present application.

[0038] Figure 14 A structure view of a first clamping member of a bending test device according to an embodiment of the present application. Figure 1

[0039] Figure 15 A structure view of a third clamping member of a bending test device according to an embodiment of the present application. Figure 1

[0040] Figure 16 A sectional view of the third clamping member. Figure 15

[0041] In the drawings, the reference signs are explained as follows:

[0042] ​​​​10, bending test device; 100, base; 100a, mounting area; 100b, hollowed area; 100c, mounting surface; 140, weight-reducing groove; 200, first adjusting mechanism; 200a, first guide assembly; 300a, second guide assembly; 400a, third guide assembly; 210, first clamping member; 211, first clamping cavity; 212, first slit; 213, first clamping body; 214, first clamping slot; 220, first X-direction guide structure; 221, first rail; 2210, rail seat; 2211, first matching part; 222, first moving table; 2220, table body; 2221, second matching part; 22, receiving groove; 22a, dovetail groove; 22b, rectangular groove; 22c, first straight groove part; 22d, second straight groove part; 223, transmission assembly; 2231, rack; 2232, operation part; 225, stopper; 226, locking member; 227, test assembly, 2271, main ruler, 2272, scale; 230, first Z-direction guide structure; 231, second rail; 232, second moving table; 300, second adjusting mechanism; 310, second clamping member; 311, second clamping cavity; 320, second X-direction guide structure; 330, second Z-direction guide structure; 400, third adjusting mechanism; 410, third clamping member; 411, third clamping cavity; 411a, inlet end; 411b, outlet end; 412, third slit; 413, third clamping body; 414, third clamping slot; 415, first extension part; 4151, first threaded hole; 416, second extension part; 4161, second threaded hole; 417, adjusting member; 4171, threaded column; 4172, nut; 420, third Z-direction guide structure; 500, hose; 20, sheath. DETAILED DESCRIPTION

[0043] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that, if these terms "center", "Z direction", "X direction", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] like Figure 1 , Figure 2 and Figure 7 As shown, a bending test device 10 provided in one embodiment of this application includes a base 100, a first adjustment mechanism 200, a second adjustment mechanism 300, and a third adjustment mechanism 400. The first adjustment mechanism 200 includes a first clamping member 210, the second adjustment mechanism 300 includes a second clamping member 310, and the third adjustment mechanism 400 includes a third clamping member 410. Along a first direction, the third clamping member 410 is located between the first clamping member 210 and the second clamping member 310. At least one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 is movable along the first direction, and at least two of them are independently movable along a second direction, which intersects with the first direction. The first clamping member 210, the second clamping member 310, and the third clamping member 410 all have functions for clamping medical tubing 20 (such as...). Figure 9 The clamping cavity of the inserted flexible tube 500 (shown) has a central axis parallel to a first direction for at least one of the clamping cavities of the first clamping member 210, the second clamping member 310, and the third clamping member 410. In some embodiments, the bending test device 10 includes a flexible tube 500 for insertion of the medical fitting 20. In other embodiments, the bending test device 10 does not include a flexible tube 500, which may be provided separately.

[0050] The hose 500 can be, but is not limited to, PTFE (polytetrafluoroethylene), silicone, or Pebax (polyether block amide).

[0051] Furthermore, since the second direction is perpendicular to the first direction, the movement distance of the first clamping member 210, the second clamping member 310, and the third clamping member 410 is shorter during the process of making the hose 500 present a preset curved shape, which helps to improve the testing efficiency. In other embodiments, the second direction and the first direction may also intersect but not be perpendicular, for example, the angle between the second direction and the first direction is 80°, etc.

[0052] The base 100 serves as a support component of the bending test device 10, and is mainly used to support and mount the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400. As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100. Figure 1

[0053] As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100. Figure 1 Figure 8 As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100. Figure 1 As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100. Figure 1 As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100. Figure 1 As shown in FIG. 1, the base 100 has a mounting surface 100c, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged on the mounting surface 100c. Throughout the specification, the first direction and the second direction can be parallel to the mounting surface 100c, or the first direction can be parallel to the mounting surface 100c, and the second direction can be perpendicular to the mounting surface 100c. If the second direction is perpendicular to the mounting surface 100c, it is beneficial to reduce the floor area of the base 100.

[0054] The medical tube 20 can be a hollow tube, and can be made of Pebax (Polyether Block Amide), PTFE (Polytetrafluoroethylene), PE (Polyethylene), or the like, but is not limited thereto. Figure 9 As shown in FIG. 1, the medical tube 20 can be a sheath, and the dilator 20a can be inserted into the proximal end of the medical tube 20 and protrude from the distal end of the medical tube 20. Throughout the specification, the terms "distal end" and "proximal end" are used only to indicate the relative position relationship. The "distal end" of a component refers to the end that enters the patient's body first and / or is farther away from the operator during normal operation, and the "proximal end" refers to the end that enters the patient's body later and / or is closer to the operator.

[0055] ​​The process of the bending test device 10 bending the medical tube 20 is described below by taking the sheath as an example: first, after the first clamping member 210, the second clamping member 310, and the third clamping member 410 clamp the hose 500, at least one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 is adjusted in the first direction, and / or at least two of the first clamping member 210, the second clamping member 310, and the third clamping member 410 are independently adjusted in the second direction, or at least one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 is adjusted in the first direction first, and / or at least two of the first clamping member 210, the second clamping member 310, and the third clamping member 410 are independently adjusted in the second direction, and then the first clamping member 210, the second clamping member 310, and the third clamping member 410 clamp the hose 500 together to make the hose 500 present a preset bending shape; second, the sheath with the dilator 20a inserted is inserted into the hose 500, then the dilator 20a is pulled out, and then it is observed whether the sheath is bent. If the sheath is not bent, the position of the first clamping member 210, the second clamping member 310, or the third clamping member 410 can be further adjusted to change the bending shape of the hose 500 and the sheath until the sheath is bent, so as to determine the limit condition of the sheath bending.

[0056] Compared with the bending test device in which only one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 can move in the second direction, or only two of them can move in the second direction synchronously, in the present application, the first clamping member 210, the second clamping member 310, and the third clamping member 410 have clamping cavities for clamping the hose 500, at least one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 can move in the first direction, the center axis of the clamping cavity of at least one of the first clamping member 210, the second clamping member 310, and the third clamping member 410 is parallel to the first direction, and at least two of the first clamping member 210, the second clamping member 310, and the third clamping member 410 can independently move in the second direction, the second direction intersects the first direction, so that the first clamping member 210, the second clamping member 310, and the third clamping member 410 of the present application can make the hose 500 present more bending shapes, can simulate more kinds and / or more close to the bending shape of the human body blood vessels, and thus are more conducive to testing the bending performance of the medical tube 20 which needs to be inserted into the human body blood vessels.

[0057] In addition, compared with the existing ordinary pipe bending test method, the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 of the bending test device 10 provided by the application are not directly clamped on the medical pipe 20, but first clamped on the hose 500 by the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410, and the positions of the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 are adjusted to bend the hose 500 into a preset shape, so as to simulate the bending shape of the human blood vessel, and then the medical pipe 20 is inserted into the hose 500 to observe whether the medical pipe 20 is bent in the hose 500, so as to determine the limit condition of the bending of the medical pipe 20. Since the medical pipe 20 needs to be inserted into the human blood vessel in the minimally invasive surgery, the bending performance of the medical pipe 20 is tested by simulating the bending shape of the human blood vessel by the hose 500 and then inserting the medical pipe 20 into the hose 500, which is closer to the actual application scene, and the test result is more referable to the actual application scene.

[0058] Exemplarily, the first clamping piece 210 and the second clamping piece 310 can be independently moved along the first direction, and the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 can be independently moved along the second direction.

[0059] Exemplarily, the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 can be independently moved along the first direction and can be independently moved along the second direction.

[0060] As shown in Figure 1 some embodiments, the first adjusting mechanism 200 further comprises a first guide assembly 200a, the first clamping piece 210 is arranged on the first guide assembly 200a, and the first guide assembly 200a can move the first clamping piece 210 along the first direction and the second direction; the second adjusting mechanism 300 further comprises a second guide assembly 300a, the second clamping piece 310 is arranged on the second guide assembly 300a, and the second guide assembly 300a can move the second clamping piece 310 along the first direction and the second direction; the third adjusting mechanism 400 further comprises a third guide assembly 400a, the third clamping piece 410 is arranged on the third guide assembly 400a, and the third guide assembly 400a can move the third clamping piece 410 along the second direction. The first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a are independently arranged on the base 100. By independently arranging the first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a, the first clamping piece 210 and the second clamping piece 310 can be independently moved along the first direction, and the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 can be independently moved along the second direction.

[0061] In the embodiment, the first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a are independently arranged on the base 100, and the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 are independently arranged on the first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a respectively.Figure 4 As shown, in order to distinguish the clamping cavities of the first clamping member 210, the second clamping member 310 and the third clamping member 410, the clamping cavity of the first clamping member 210 is defined as a first clamping cavity 211, the clamping cavity of the second clamping member 310 is defined as a second clamping cavity 311, and the clamping cavity of the third clamping member 410 is defined as a third clamping cavity 411.

[0062] Further, the central axes of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 are parallel to the first direction, and the central axes of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 can coincide. When the hose 500 is arranged in the second clamping cavity 311, the third clamping cavity 411 and the first clamping cavity 211, the central axes of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 are in a state of coincidence, which is beneficial to reduce the resistance of the hose 500 and can make the hose 500 be arranged in the clamping cavities more easily.

[0063] As shown in Figures 1 to 4 During testing, the positions of the first clamping member 210, the second clamping member 310 and the third clamping member 410 in the second direction can be adjusted first; when the central axes of the clamping cavities of the first clamping member 210, the second clamping member 310 and the third clamping member 410 are in a state of coincidence, the hose 500 is sequentially arranged in the first clamping cavity 211 of the first clamping member 210, the third clamping cavity 411 of the third clamping member 410 and the second clamping cavity 311 of the second clamping member 310; then, the first clamping member 210, the second clamping member 310 or the third clamping member 410 is moved along the first direction or the second direction until the hose 500 is bent into a preset shape. By arranging the positions of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 in this way, the hose 500 can be sequentially arranged in the first clamping cavity 211, the third clamping cavity 411 and the second clamping cavity 311 along a straight line, which can reduce the difficulty of arranging the hose 500.

[0064] Further, the movement planes of the centers of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 are the same plane, which is referred to as a common movement plane hereinafter.

[0065] Further, referring to Figure 1 and Figure 3The first guide assembly 200a and the second guide assembly 300a are staggered in the first direction, and the third guide assembly 400a is substantially aligned with the first guide assembly 200a or the second guide assembly 300a in the first direction. As an example, the third guide assembly 400a is substantially aligned with the second guide assembly 300a in the first direction, and as another example, the third guide assembly 400a can also be substantially aligned with the first guide assembly 200a in the first direction. The first clamping member 210 is arranged on the side of the first guide assembly 200a facing the common movement plane, the second clamping member 310 is arranged on the side of the second guide assembly 300a facing the common movement plane, and the third clamping member 410 is arranged on the side of the third guide assembly 400a facing the common movement plane, so as to facilitate the center axes of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 being parallel to the first direction.

[0066] In other embodiments, the first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a are arranged in the first direction, and the first clamping member 210, the second clamping member 310 and the third clamping member 410 are arranged on the same side of the first guide assembly 200a, the second guide assembly 300a and the third guide assembly 400a respectively, so as to facilitate the center axes of the first clamping cavity 211, the second clamping cavity 311 and the third clamping cavity 411 being parallel to the first direction.

[0067] In some embodiments, at least one of the first adjusting mechanism 200, the second adjusting mechanism 300 and the third adjusting mechanism 400 comprises a track, a moving platform and a transmission assembly. The track extends in the first direction or the second direction, the moving platform is movable along the track, the corresponding clamping member is connected to the moving platform, and the transmission assembly is capable of driving the moving platform to move along the track. By driving the moving platform to move along the track through the transmission assembly, the stability of the moving platform during movement along the track is better, and the position of the moving platform can be adjusted more accurately.

[0068] Further, the transmission assembly comprises a rack, a gear and an operation part. The rack is protruded on the track and extends in the extension direction of the track, the gear is rotatably arranged on the moving platform, the gear is engaged with the rack, and the operation part is fixedly connected with the gear. The rotation of the operation part can drive the gear to rotate, and in turn drive the moving platform to move on the track. By rotating the operation part to drive the gear to rotate, and by the cooperation between the gear and the rack, the cost is lower compared to other transmission assemblies, and the transmission assembly has high rigidity and is less likely to be deformed or broken, thereby having a longer service life.

[0069] Specifically, as shown in FIG. 1, the first adjusting mechanism 200 comprises a first guide assembly 200a and a first clamping member 210, the second adjusting mechanism 300 comprises a second guide assembly 300a and a second clamping member 310, and the third adjusting mechanism 400 comprises a third guide assembly 400a and a third clamping member 410. Figure 1 , Figure 3 and Figure 10As shown, the first guiding assembly 200a comprises a first X-direction guiding structure 220 and a first Z-direction guiding structure 230; the first X-direction guiding structure 220 is capable of moving the first clamping member 210 in a first direction, and the first Z-direction guiding structure 230 is capable of moving the first clamping member 210 in a second direction.

[0070] The first X-direction guiding structure 220 comprises a first rail 221 and a first moving table 222; the first rail 221 extends in the first direction and is fixed to the base 100, and the first rail 221 can be fixed to the base 100 by screwing, clamping or other means, facilitating the disassembly and assembly of the first rail 221. The first moving table 222 is capable of moving along the first rail 221, and the first clamping member 210 is connected to the first moving table 222. Specifically, the first Z-direction guiding structure 230 is fixed to the first moving table 222, and the first clamping member 210 is fixed to the first Z-direction guiding structure 230, so that the first clamping member 210 is indirectly connected to the first moving table 222. Through the cooperation of the first rail 221 and the first moving table 222, the first Z-direction guiding structure 230 can move along the first direction with the first clamping member 210.

[0071] In other embodiments, the first X-direction guiding structure 220 can also be other structures, such as a lead screw and a bearing table. The lead screw extends in the first direction, and the bearing table is provided with a lead screw nut. The lead screw nut is sleeved on the lead screw. The lead screw can be rotated to drive the bearing table to move, and the first Z-direction guiding structure 230 is arranged on the bearing table and moves with the bearing table on the lead screw.

[0072] Further, as shown in Figure 10 The first X-direction guiding structure 220 further comprises a transmission assembly 223, which is capable of driving the first moving table 222 to move along the first rail 221. The transmission assembly 223 comprises a rack 2231, a gear (not shown in the figure) and an operating part 2232. The rack 2231 is protruded on the first rail 221 and extends along the extension direction of the first rail 221. The gear is rotatably arranged on the first moving table 222, and the gear is engaged with the rack 2231. The operating part 2232 is fixed to the gear, and the rotation of the operating part 2232 can drive the gear to rotate, thereby driving the first moving table 222 to move on the first rail 221. The operating part 2232 comprises a rod body.

[0073] Further, the first track 221 comprises a track base 2210 and a first matching part 2211, and the first moving table 222 comprises a table body 2220 and a second matching part 2221. The track base 2210 is arranged on the base 100, and extends along a first direction. The first matching part 2211 is arranged on the track base 2210, and the second matching part 2221 is arranged on the table body 2220. The first matching part 2211 is connected with the second matching part 2221, and the cooperation between the first matching part 2211 and the second matching part 2221 can guide the movement of the first moving table 222.

[0074] Further, one of the first matching part 2211 and the second matching part 2221 is a protrusion, and the other is a receiving groove. The first matching part 2211 is arranged on a side of the track base 2210 away from the base 100, and the second matching part 2221 is arranged on a side of the table body 2220 facing the first matching part 2211. Both the first matching part 2211 and the second matching part 2221 extend along the first direction, and the first matching part 2211 is clamped with the second matching part 2221. Through the cooperation between the protrusion and the receiving groove, the movement of the first moving table 222 can be guided, and the structure is simple and easy to manufacture.

[0075] For example, the first matching part 2211 is a protrusion, the second matching part 2221 is a receiving groove, the operation part 2232 is arranged through the table body 2220, a gear is arranged in the second matching part 2221, the operation part 2232 is fixedly connected with the gear, and a gear rack 2231 is arranged on a side of the first matching part 2211 away from the track base 2210.

[0076] For another example, the first matching part 2211 is a receiving groove, the second matching part 2221 is a protrusion, the operation part 2232 is arranged through the track base 2210, a gear is rotatably connected with the first moving table 222, and the gear is located on a side of the first moving table 222 close to the first matching part 2211. The operation part 2232 is fixedly connected with the gear, and a gear rack 2231 is arranged in the first matching part 2211.

[0077] During installation, the first moving table 222 can be pushed into the first track 221 from the side of the first track 221. The first moving table 222 and the first track 221 can be made of alloy, metal or plastic.

[0078] Optionally, as Figure 11 and Figure 12As shown, the receiving groove 22 includes a dovetail groove 22a and a rectangular groove 22b, the dovetail groove 22a and the rectangular groove 22b are communicated, the opening of the dovetail groove 22a is the opening of the receiving groove 22, the rectangular groove 22b is located at the side of the dovetail groove 22a far from the opening, the diameter of the opening of the dovetail groove 22a is smaller than the inner diameter of the dovetail groove 22a, and the protruding structure is matched with the structure of the dovetail groove 22a. In this way, the first moving table 222 can be prevented from falling off the first track 221. The rectangular groove 22b can receive the rack 2231 or the gear.

[0079] Further, the dovetail groove 22a has a first width W1, the direction of the first width W1 is parallel to the mounting surface 100c and perpendicular to the first direction, and the first width W1 of the dovetail groove 22a gradually increases from the opening to the inner part.

[0080] In other embodiments, the receiving groove 22 can also have other shapes, for example, as shown in FIG. 6, the receiving groove 22 can be a stepped groove, that is, the receiving groove 22 has a first straight groove part 22c and a second straight groove part 22d, the first straight groove part 22c is closer to the opening of the receiving groove 22 than the second straight groove part 22d, and the width of the first straight groove part 22c is smaller than the width of the second straight groove part 22d. The protrusion is received in the receiving groove 22, and the first moving table 222 can be prevented from falling off the first track 221. The rack 2231 or the gear can be received in the second straight groove part 22d. Figure 13 Further, as shown in FIG. 7, the first track 221 further includes a stopper 225, the stopper 225 is arranged at both ends of the rack 2231, or the stopper 225 is arranged on the protrusion of the first track and adjacent to both ends of the rack 2231, so that the stopper 225 can stop the gear.

[0081] Figure 10 When the stopper 225 is arranged at both ends of the rack 2231, the stopper 225 can be used to fix the rack 2231 on the protrusion of the first track 221, and can also stop the gear to prevent the first moving table 222 from sliding out of the first track 221.

[0082] The stopper 225 can be a screw, a stud, etc., which is not limited in the present application.

[0083] Further, as shown in FIG. 8, the first track 221 further includes a stopper 225, the stopper 225 is arranged at both ends of the rack 2231, or the stopper 225 is arranged on the protrusion of the first track and adjacent to both ends of the rack 2231, so that the stopper 225 can stop the gear.

[0084] Further, as shown in FIG. 8, the first track 221 further includes a stopper 225, the stopper 225 is arranged at both ends of the rack 2231, or the stopper 225 is arranged on the protrusion of the first track and adjacent to both ends of the rack 2231, so that the stopper 225 can stop the gear. Figure 1 Figure 3 Figure 5 and Figure 6 ​​​As shown, the first rail 221 extends out of the base 100 in the first direction, and specifically, the rail seat 2210 extends out of the base 100 in the first direction. Compared to fixing the first rail 221 integrally on the base 100, extending the first rail 221 partially out of the base 100 can not only reduce the weight of the bending test device 10, but also reduce the footprint of the bending test device 10. Optionally, as shown in FIG. 2B, the first rail 221 extends out of the base 100 in the first direction, and specifically, the rail seat 2210 extends out of the base 100 in the first direction. Compared to fixing the first rail 221 integrally on the base 100, extending the first rail 221 partially out of the base 100 can not only reduce the weight of the bending test device 10, but also reduce the footprint of the bending test device 10. Figure 5 As shown, the rail seat 2210 has a total length L1 in the first direction and a first length L2 extending out of the base 100, L2≤0.5×L1, such as L2=0.5×L1, L2=0.4×L1, L2=0.3×L1, L2=0.2×L1, L2=0.1×L1, etc. In this way, the center of gravity of the bending test device 10 can be prevented from being unbalanced due to the excessive length of the first rail 221 extending out of the base 100, and the base 100 can stably support the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400.

[0085] Further, the length of the first moving platform 222 extending out of the rack 2231 is related to the installation position of the gear and the stopper 225. If the gear is arranged at the middle position of the first moving platform 222 in the first direction, and the stopper 225 is arranged on the protrusion of the first rail and is adjacent to the two ends of the rack 2231, the length of the first moving platform 222 extending out of the rack 2231 is half of the total length of the first moving platform 222 in the first direction.

[0086] Further, continuing to refer to Figure 11 When the first matching part 2211 is a protrusion and the second matching part 2221 is a receiving groove, the locking part 226 can be arranged on the first moving platform 222 and abut against the protrusion of the first rail 221, and specifically, the locking part 226 can be arranged on the platform body 2220 and abut against the protrusion of the first rail 221, so as to prevent the first moving platform 222 from moving. Alternatively, when the first matching part 2211 is a receiving groove and the second matching part 2221 is a protrusion, the locking part 226 can be arranged on the first rail 221 and abut against the protrusion of the first moving platform 222, and specifically, the locking part 226 can be arranged on the rail seat 2210 and abut against the protrusion of the first moving platform 222, so as to prevent the first moving platform 222 from moving.

[0087] The locking part 226 can be a threaded part and can be screwed with the first moving platform 222. The locking part 226 can be provided in two, and in the first direction, the operation part 2232 is located between the two locking parts 226, so that the movement of the moving platform 222 can be effectively prevented.

[0088] Referring to Figure 1In an embodiment, the first X-direction guiding structure 220 further comprises a testing assembly 227, which comprises a main scale 2271 and a scale 2272. The main scale 2271 is arranged on the surface of the first track 221 along the first direction, and the scale 2272 is arranged on the surface of the first moving platform 222 along the first direction. The moving distance of the first moving platform 222 along the first direction can be determined by reading the main scale 2271 and the scale 2272, and the bending degree of the blood vessel can also be represented. Alternatively, the scale 2272 can be a vernier caliper, so that the moving distance of the first moving platform 222 along the first direction can be accurately determined.

[0089] Further, the first Z-direction guiding structure 230 is the same as or similar to the first X-direction guiding structure 220. Specifically, the first Z-direction guiding structure 230 comprises a second track 231 and a second moving platform 232, and the second moving platform 232 is capable of moving along the second track 231. The second track 231 is fixedly connected to the first X-direction guiding structure 220, and extends along a second direction. Specifically, the second track 231 is fixedly connected to the first moving platform 222, and the first clamping member 210 is fixedly connected to the second moving platform 232 of the first Z-direction guiding structure 230.

[0090] Further, the second guiding assembly 300a comprises a second X-direction guiding structure 320 and a second Z-direction guiding structure 330, and the second X-direction guiding structure 320 has the same structure as the first X-direction guiding structure 220. The second Z-direction guiding structure 330 has the same structure as the first Z-direction guiding structure 230. The third guiding assembly 400a comprises a third Z-direction guiding structure 420, and the third Z-direction guiding structure 420 has the same structure as the first Z-direction guiding structure 230, which can reduce the processing difficulty of the bending test device 10. It should be noted that when the third guiding assembly 400a does not comprise a third X-direction guiding structure, the third Z-direction guiding structure 420 can be directly fixedly arranged on the base 100. In other embodiments, the third guiding assembly 400a can comprise a third X-direction guiding structure.

[0091] In some other embodiments, the first Z-direction guiding structure 230 and the first X-direction guiding structure 220 can also have different structures. The second X-direction guiding structure 320 and the first X-direction guiding structure 220 can also have different structures. The second Z-direction guiding structure 330 and the first Z-direction guiding structure 230 can also have different structures. The third Z-direction guiding structure 420 and the first Z-direction guiding structure 230 can also have different structures.

[0092] In some embodiments, at least one of the first clamping member 211, the second clamping member 311 and the third clamping member 411 is also movable along a third direction, which is perpendicular to the first direction and the second direction. In this way, the movement freedom of the bending test device 10 can be further increased, and a three-dimensional simulated blood vessel can be realized, further improving the simulation accuracy of the bending state of the artificial blood vessel.

[0093] Specifically, the first adjusting mechanism 200 further comprises a first Y-direction guiding structure (not shown in the figure), which is capable of moving the first clamping member 210 along the third direction. The first X-direction guiding structure 220 can be arranged on the base 100, and then the first Y-direction guiding structure is arranged on the first X-direction guiding structure 220, and the first Z-direction guiding structure 230 is arranged on the first Y-direction guiding structure; or the first X-direction guiding structure 220 can be arranged on the base 100, and then the first Z-direction guiding structure 230 is arranged on the first X-direction guiding structure 220, and the first Y-direction guiding structure is arranged on the first Z-direction guiding structure 230; or the first Y-direction guiding structure can be arranged on the base 100, and then the first X-direction guiding structure 220 is arranged on the first Y-direction guiding structure, and the first Z-direction guiding structure 230 is arranged on the first X-direction guiding structure 220; or the first Y-direction guiding structure can be arranged on the base 100, and then the first Z-direction guiding structure 230 is arranged on the first Y-direction guiding structure, and the first X-direction guiding structure 220 is arranged on the first Z-direction guiding structure 230. The structure of the first Y-direction guiding structure can also be the same as that of the first X-direction guiding structure. Similarly, the second adjusting mechanism 300 can also comprise a second Y-direction guiding structure, which is capable of moving the second clamping member 310 along the third direction, and the second Y-direction guiding structure can be the same as or different from the second X-direction guiding structure 320. Similarly, the third adjusting mechanism 400 can also comprise a third Y-direction guiding structure, which is capable of moving the third clamping member 410 along the third direction.

[0094] In some embodiments, as shown in FIG. 2, the first adjusting mechanism 200 further comprises a first X-direction guiding structure 220, which is capable of moving the first clamping member 210 along the first direction. The first X-direction guiding structure 220 can be arranged on the base 100, and then the first Z-direction guiding structure 230 is arranged on the first X-direction guiding structure 220; or the first X-direction guiding structure 220 can be arranged on the base 100, and then the first Z-direction guiding structure 230 is arranged on the first X-direction guiding structure 220. The structure of the first X-direction guiding structure 220 can also be the same as that of the first Z-direction guiding structure 230. Figure 14As shown, the first clamping member 210 comprises a first clamping body 213, the first clamping body 213 is provided with a first clamping cavity 211 in the first direction, and the first clamping body 213 is also provided with a first slit 212, the first slit 212 is in communication with the first clamping cavity 211, and the first slit 212 penetrates the first clamping body 213 in a direction perpendicular to the first direction, that is, the first slit 212 penetrates the first clamping body 213 in the radial direction of the first clamping cavity 211. Due to the manufacturing tolerance of the outer diameter of the hose 500, when the first clamping cavity 211 is provided in the first direction in the first clamping body 213, the first slit 212 which is in communication with the first clamping cavity 211 and penetrates the first clamping body 213 in a direction perpendicular to the first direction is beneficial to the diameter of the first clamping cavity 211 can have a slight elastic change, and it is beneficial to the first clamping cavity 211 can be self-adaptive to the hose 500 with different diameters; in addition, when the medical pipe fitting 20 is inserted into the hose 500, it may cause the hose 500 to swell slightly, the existence of the first slit 212 is beneficial to provide a slight elastic space to allow the hose to have a slight expansion allowance, and it is convenient to insert the medical pipe fitting 20 into the hose 500. The shape of the first slit 212 can be a "one" type opening, a circular opening, etc., which is not limited in the present application. In other embodiments, the first clamping member 210 can also not be provided with the first slit 212.

[0095] Further, the material of the first clamping member 210 is a material with moderate elastic modulus, such as nylon material, that is, the material of the first clamping member 210 can be nylon material. The lower the elastic modulus, the greater the elastic deformation of the material under the same stress. The first clamping member 210 is prepared by selecting nylon with moderate elastic modulus, which can avoid that the first clamping member 210 is difficult to deform and needs a great force to produce a slight deformation when the elastic modulus is too high (such as hard ceramic, some brittle plastics); at the same time, it can avoid that the first clamping member 210 deforms too much and is difficult to provide enough clamping force to the hose 500 when the elastic modulus is too low (such as rubber, soft silicone).

[0096] Further, the first clamping body 213 has elasticity, and the first clamping body 213 is also provided with a first clamping slot 214, the first clamping slot 214 is in communication with the first clamping cavity 211, and the first clamping slot 214 is opposite to the first slit 212. By arranging the first clamping slot 214 opposite to the first slit 212, it is beneficial to make the difficulty of elastic deformation of the first clamping body 213 lower. The shape of the first clamping slot 214 can be "U" shape or "C" shape.

[0097] The second clamping piece 310 is the same as the first clamping piece 210, which is beneficial to save production cost, and details are not repeated herein. In other embodiments, the structure of the second clamping piece 310 can also be different from that of the first clamping piece 210. The third clamping piece 410 can be the same as or different from the first clamping piece 210.

[0098] In some embodiments, as shown in FIG. 4, the third clamping piece 410 includes a third clamping body 413, and the third clamping body 413 is provided with a third clamping cavity 411 in the first direction. The third clamping body 413 is also provided with a third slit 412, which is in communication with the third clamping cavity 411 and penetrates the third clamping body 413 in a direction perpendicular to the first direction, i.e., the third slit 412 penetrates the third clamping body 413 in the radial direction of the third clamping cavity 411. The third slit 412 penetrating the third clamping body 413 in the direction perpendicular to the first direction is beneficial to the slight elastic change of the diameter of the third clamping cavity 411, and is beneficial to the soft tube 500 with different diameters being arranged in the third clamping cavity 411. Figure 15

[0099] Further, the main material of the third clamping piece 410 is a material with moderate elastic modulus, such as nylon material. If the selected material has too high elastic modulus (such as hard ceramic, some brittle plastics), a very large force is needed to cause the third clamping piece 410 to deform slightly; if the selected material has too low elastic modulus (such as rubber, soft silicone), the third clamping piece 410 is prone to deform too much and is difficult to provide sufficient clamping force to the soft tube 500. Therefore, in this embodiment, the third clamping piece 410 is made of nylon with moderate elastic modulus, which is beneficial to providing sufficient clamping force to the soft tube 500 and causing the third clamping piece 410 to deform slightly when subjected to a force that expands or shrinks the third clamping cavity 411.

[0100] Further, the third clamping body 413 is elastic, and the third clamping body 413 is also provided with a third clamping slot 414, which is in communication with the third clamping cavity 411 and is arranged opposite to the third slit 412. The third clamping slot 414 arranged opposite to the third slit 412 is beneficial to making the third clamping body 413 deform elastically with lower difficulty, so that the soft tube 500 can be more easily arranged in the third clamping cavity 411.

[0101] ​Further, the third clamping member 410 further comprises a first extension 415 and a second extension 416, both of which are fixed to the outer side of the third clamping body 413 and arranged oppositely, and the gap between the first extension 415 and the second extension 416 is communicated with the third slot 412; the adjusting member 417 is connectable with the first extension 415 and the second extension 416, and the adjusting member 417 can adjust the size of the gap between the first extension 415 and the second extension 416, so as to adjust the size of the third clamping cavity 411.

[0102] The first extension 415 and the second extension 416 can be integrally formed with the third clamping body 413, or can be riveted, buckled or screwed, etc.

[0103] Since the maximum bending moment of the medical tube 20 is located at the midpoint of the bending section of the medical tube 20 when the medical tube 20 is bent in the body, and the medical tube 20 will produce axial contraction during the bending test, in order to simulate the clinical stress scenario, in the embodiment, the third clamping member 410 located in the middle clamps the middle region of the medical tube 20, the gap between the first extension 415 and the second extension 416 is adjusted to be smaller by the adjusting member 417, so that the third clamping member 410 generates a radial clamping force (hoop stress), which fixes the hose 500 and the medical tube 20 in the hose 500, preventing the hose 500 and the medical tube 20 from moving during the bending test, the first clamping member 210 and the second clamping member 310 on both sides allow the medical tube 20 to slide slightly, rather than clamping the medical tube 20 by the first clamping member 210 or the second clamping member 310 on both sides, the scheme of the embodiment is beneficial to avoid stress concentration at the end of the medical tube 20, which causes the test data to be unable to reflect the true bending resistance, so as to accurately reproduce the clinical bending mechanism and improve the reliability of the test data.

[0104] Further, the first extension part 415 is provided with a first threaded hole 4151, and the second extension part 416 is provided with a second threaded hole 4161; the adjusting part 417 is provided with threads, the adjusting part 417 is arranged in the first threaded hole 4151 and the second threaded hole 4161, and the adjusting part 417 cooperates with the first threaded hole 4151 and the second threaded hole 4161 to adjust the gap between the first extension part 415 and the second extension part 416. Specifically, the first threaded hole 4151 and the second threaded hole 4161 can be through holes, the adjusting part 417 includes a threaded column 4171 and a nut 4172, the threaded column 4171 is arranged in the first threaded hole 4151 and the second threaded hole 4161, and when the nut 4172 abuts against the first extension part 415 or the second extension part 416, the gap between the first extension part 415 and the second extension part 416 can be adjusted by rotating the threaded column 4171 or the nut 4172. Alternatively, one of the first threaded hole 4151 and the second threaded hole 4161 is a through hole, and the other is a blind hole, the adjusting part 417 includes a threaded column 4171, the threaded column 4171 is arranged in the through hole and connected with the blind hole, and the gap between the first extension part 415 and the second extension part 416 can be adjusted by rotating the threaded column 4171 when the threaded column 4171 abuts against the bottom wall of the blind hole.

[0105] In other embodiments, the first extension part 415 is provided with a first through hole, the second extension part 416 is provided with a second through hole, the adjusting part 417 includes a threaded column and a nut, the threaded column is arranged in the first through hole and the second through hole, and the nut is arranged on the threaded column, the nut cooperates with the threaded column to adjust the gap between the first extension part 415 and the second extension part 416.

[0106] When the gap between the first extension part 415 and the second extension part 416 is adjusted by the threaded cooperation, the gap between the first extension part 415 and the second extension part 416 can be linearly and continuously changed, which is more conducive to adjusting the gap between the first extension part 415 and the second extension part 416 to the target gap according to the pipe diameter of the hose 500 and the medical pipe fitting 20, and the threaded cooperation has low manufacturing cost.

[0107] In other embodiments, the adjusting part 417 can also have other structures, for example, the adjusting part 417 includes a first sliding block and a second sliding block, the first sliding block is fixedly connected with the first extension part 415, the second sliding block is fixedly connected with the second extension part 416, the first sliding block and the second sliding block at least partially overlap, the first sliding block is thin and provided with a plurality of through holes, the side of the second sliding block facing the first sliding block is provided with an elastic part, when the elastic part is inserted into the through hole of the first sliding block and partially protrudes from the side of the first sliding block away from the second sliding block, the relative position of the first sliding block and the second sliding block is fixed, pressing the elastic part can make the second sliding block slide relative to the first sliding block, thereby adjusting the gap between the first extension part 415 and the second extension part 416.

[0108] Further, as shown in Figure 16 The third clamping body 413 of the third clamping member 410 has an inlet end 411a and an outlet end 411b arranged along the first direction, and the third clamping cavity 411 communicates with the inlet end 411a and the outlet end 411b. The size of the third clamping cavity 411 gradually decreases from the inlet end 411a to the outlet end 411b.

[0109] If the size of the third clamping cavity 411 is constant, the medical tube 20 will have a sudden stress change at the clamping boundary, and the medical tube 20 will usually be bent at the clamping boundary, which will cause the bending test result to be disturbed by the third clamping member 410. In the embodiment, the size of the third clamping cavity 411 gradually decreases from the inlet end 411a to the outlet end 411b, the stress concentration is eliminated by the gradual change in diameter, the bending position is closer to the position where bending occurs in the clinic, and the test result has higher reliability.

[0110] In some embodiments, as shown in Figure 8 The side of the base 100 away from the first adjusting mechanism 200 is provided with a weight-reducing groove 140, that is, the side of the base 100 away from the mounting surface 100c is provided with the weight-reducing groove 140. The provision of the weight-reducing groove 140 can not only reduce the weight of the base 100, but also does not affect the installation of the first guide assembly 200a, the second guide assembly 300a, and the third guide assembly 400a.

[0111] The shape of the weight-reducing groove 140 can be set according to the position arrangement of the first guide assembly 200a, the second guide assembly 300a, and the third guide assembly 400a. For example, as shown in Figure 3 When the second guide assembly 300a is staggered with the first guide assembly 200a and aligned with the third guide assembly 400a in the first direction, the weight-reducing groove 140 can be an opening groove penetrating through the base 100 in the first direction.

[0112] In an embodiment, as shown in Figure 8 The base 100 has a mounting area 100a and a hollow area 100b, and the first adjusting mechanism 200, the second adjusting mechanism 300, and the third adjusting mechanism 400 are arranged in the mounting area 100a. The provision of the hollow area 100b can also reduce the weight of the base 100. The base 100 can be provided with one of the weight-reducing groove 140 and the hollow area 100b.

[0113] As an implementation, the base 100 can form the hollow area 100b by opening a weight-reducing hole, and the weight-reducing hole penetrates through the base 100 along the second direction. The weight-reducing hole can be a round hole, a waist hole, etc., which are not limited in the present application.

[0114] In another aspect, an embodiment of the present application provides a bending test method of a medical tube, applied to the bending test device 10 in any of the above embodiments, the test method comprising:

[0115] Step 100, providing the bending test device in the above embodiments, and threading the hose 500 into the clamping cavities of the first clamping member 210, the second clamping member 310 and the third clamping member 410, so that the hose 500 is clamped in the clamping cavities of the first clamping member 210, the second clamping member 310 and the third clamping member 410;

[0116] Step 200, adjusting the position of at least one of the first clamping member 210, the second clamping member 310 and the third clamping member 410, so that the hose 500 assumes a preset bending shape;

[0117] Step 300, inserting the medical tube 20 with the dilator inserted into the hose 500;

[0118] Step 400, pulling out the dilator;

[0119] In step 200, the position of at least one of the first clamping member 210, the second clamping member 310 and the third clamping member 410 can be adjusted in the first direction, and / or the position of at least two of the first clamping member 210, the second clamping member 310 and the third clamping member 410 can be independently adjusted in the second direction.

[0120] Optionally, the order of "threading the hose 500 into the clamping cavities of the first clamping member 210, the second clamping member 310 and the third clamping member 410" in step 100 and step 200 can be interchanged.

[0121] In the present application, the first clamping member 210, the second clamping member 310 and the third clamping member 410 have clamping cavities for clamping the hose 500, at least one of the first clamping member 210, the second clamping member 310 and the third clamping member 410 can move in the first direction, the center axis of the clamping cavity of at least one of the first clamping member 210, the second clamping member 310 and the third clamping member 410 is parallel to the first direction, and at least two of the first clamping member 210, the second clamping member 310 and the third clamping member 410 can independently move in the second direction, the second direction intersects the first direction. Compared with the bending test device in which only one of the first clamping member 210, the second clamping member 310 and the third clamping member 410 can move in the second direction, or only two of them can move in the second direction synchronously, the clamping cavities of the first clamping member, the second clamping member and the third clamping member of the bending test device 10 in the present application can clamp the hose 500 to make the hose 500 assume more bending shapes, so that more kinds and / or more human body vessel-like bending shapes can be simulated, and the bending performance of the medical tube 20 which needs to be inserted into the human body vessel can be tested more favorably.

[0122] In addition, compared with the existing common pipe bending test method, the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 of the bending test device 10 provided by the application do not directly clamp the medical pipe 20, but first clamp the hose 500 through the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410, and adjust the positions of the first clamping piece 210, the second clamping piece 310 and the third clamping piece 410 to bend the hose 500 into a preset shape, so as to simulate the bending shape of the human blood vessel, and then insert the medical pipe 20 into the hose 500 to observe whether the medical pipe 20 is bent in the hose 500, so as to determine the limit condition of the bending of the medical pipe 20. Since the medical pipe 20 needs to be inserted into the human blood vessel in the minimally invasive surgery, the bending performance of the medical pipe 20 is tested by simulating the bending shape of the human blood vessel through the hose 500 and then inserting the medical pipe 20 into the hose 500, which is closer to the actual application scene, and the test result is more referable to the actual application scene.

[0123] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0124] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A bending test apparatus for medical tubing, characterized by, The first adjusting mechanism comprises a first clamping piece, the second adjusting mechanism comprises a second clamping piece, and the third adjusting mechanism comprises a third clamping piece, the third clamping piece is located between the first clamping piece and the second clamping piece along a first direction, at least one of the first clamping piece, the second clamping piece and the third clamping piece is movable along the first direction, and at least two of them are independently movable along a second direction intersecting the first direction, wherein the first clamping piece, the second clamping piece and the third clamping piece each have a clamping cavity for clamping a hose for inserting the medical tube, and the center axis of the clamping cavity of at least one of the first clamping piece, the second clamping piece and the third clamping piece is parallel to the first direction.

2. The bend testing device for medical tubing as defined in claim 1, wherein, The bending test device has at least one of the following characteristics: The center axes of the clamping cavities of the first clamping piece, the second clamping piece and the third clamping piece are all parallel to the first direction, and the center axes of the clamping cavities of the first clamping piece, the second clamping piece and the third clamping piece can coincide; The first direction is perpendicular to the second direction; The first clamping piece and the second clamping piece are independently movable along the first direction, and the first clamping piece, the second clamping piece and the third clamping piece are independently movable along the second direction; At least one of the first clamping piece, the second clamping piece and the third clamping piece is also movable along a third direction perpendicular to the first direction and the second direction.

3. The bend testing device for medical tubing as defined in claim 1, wherein, At least one of the first clamping piece, the second clamping piece and the third clamping piece comprises a clamping body, the clamping cavity is formed in the clamping body along the first direction, and a slit is further provided in the clamping body, the slit communicates with the clamping cavity, and the slit penetrates through the clamping body along a direction perpendicular to the first direction.

4. The bend testing apparatus for medical tubing as defined in claim 3, wherein, The bending test device has at least one of the following characteristics: The target clamping piece having the slit is the first clamping piece, the second clamping piece or the third clamping piece, and the material of the target clamping piece is nylon material; The clamping body is elastic, and a clamping slot is further provided in the clamping body, the clamping slot communicates with the clamping cavity, and the clamping slot is arranged opposite to the slit.

5. The bend testing apparatus for medical tubing as defined in claim 3, wherein, The third clamping piece comprises the clamping body, a first extension, a second extension and an adjusting piece, the first extension and the second extension are fixedly connected to the outside of the clamping body and arranged opposite to each other, the gap between the first extension and the second extension communicates with the slit, the adjusting piece is connected with the first extension and the second extension, and the adjusting piece can adjust the size of the gap between the first extension and the second extension, so as to adjust the size of the clamping cavity of the third clamping piece.

6. The bend testing apparatus for medical tubing as defined in claim 5, wherein, The first extension part is provided with a first threaded hole, the second extension part is provided with a second threaded hole, the adjusting member is provided with threads, the adjusting member is arranged in the first threaded hole and the second threaded hole, and the adjusting member is threadedly connected with the first threaded hole and the second threaded hole to adjust the gap between the first extension part and the second extension part. Alternatively, the first extension part is provided with a first through hole, the second extension part is provided with a second through hole, the adjusting member comprises a threaded stud and a nut, the threaded stud is arranged in the first through hole and the second through hole, the nut is sleeved on the threaded stud, and the nut is threadedly connected with the threaded stud to adjust the gap between the first extension part and the second extension part.

7. The bend testing device for medical tubing as defined in claim 1, wherein, The third clamping member further comprises a clamping body having an inlet end and an outlet end arranged along the first direction, the clamping cavity is communicated with the inlet end and the outlet end, and the size of the clamping cavity gradually decreases from the inlet end to the outlet end.

8. The bend testing apparatus of claim 1, wherein, At least one of the first adjusting mechanism, the second adjusting mechanism and the third adjusting mechanism comprises a track, a moving table and a transmission assembly, the track extends along the first direction or the second direction, the moving table is capable of moving along the track, the corresponding clamping member is connected with the moving table, and the transmission assembly is capable of driving the moving table to move along the track. The transmission assembly comprises a rack, a gear and an operating part, the rack is protruded on the track and extends along the extension direction of the track, the gear is rotatably arranged on the moving table, the gear is engaged with the rack, the operating part is fixedly connected with the gear, and rotation of the operating part can drive the gear to rotate and drive the moving table to move on the track.

9. A bending test apparatus for medical tubing, characterized by, The first adjusting mechanism comprises a first clamping member, the second adjusting mechanism comprises a second clamping member, the third adjusting mechanism comprises a third clamping member, the third clamping member is located between the first clamping member and the second clamping member along a first direction, at least one of the first clamping member, the second clamping member and the third clamping member is capable of moving along the first direction, and at least two of them are capable of moving along a second direction respectively, the second direction intersects with the first direction, the first clamping member, the second clamping member and the third clamping member all have a clamping cavity for clamping the hose, the center axis of the clamping cavity of at least one of the first clamping member, the second clamping member and the third clamping member is parallel to the first direction, and the hose can be arranged in the medical tube.

10. A method of bend testing a medical tube, comprising: The method comprises: providing the bending test device as claimed in claim 1 or 9, and arranging the hose in the clamping cavities of the first clamping member, the second clamping member and the third clamping member so that the hose is clamped in the clamping cavities of the first clamping member, the second clamping member and the third clamping member; adjusting positions of at least one of the first clamping member, the second clamping member and the third clamping member to make the hose assume a preset bending shape; inserting the medical tube member with the dilator inserted into the hose; pulling out the dilator; wherein the adjusting positions of at least one of the first clamping member, the second clamping member and the third clamping member includes adjusting positions of at least one of the first clamping member, the second clamping member and the third clamping member in a first direction respectively and / or adjusting positions of at least two of the first clamping member, the second clamping member and the third clamping member in a second direction independently.

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