Clamping mechanism and ventricular assist system

Abstract

The invention provides a clamping mechanism which comprises a clamping ring and a locking assembly, the clamping ring comprises a ring body and a limiting buckle lug, the ring body is provided with a notch, the ring body is provided with a first end and a second end which are opposite to each other, and the first end and the second end are spaced to form the notch; the limiting buckle lug is arranged at the first end and provided with a limiting buckle hole. The locking assembly comprises a handle and a connecting arm, and the handle is rotationally connected to the second end; one end of the connecting arm is rotationally connected with the handle, the other end of the connecting arm is provided with a movable buckling lug, and the movable buckling lug is buckled with the limiting buckling lug and can move in the limiting buckling hole; when the handle rotates, the movable buckle lug of the connecting arm can be driven to move in the limiting buckle hole, so that the distance between the first end and the second end is adjusted, and the inner diameter of the ring body is adjusted. According to the clamping mechanism provided by the invention, the movable buckling lug is buckled with the limiting buckling lug, so that an operator can directly drive the connecting arm to move by rotating the handle, and the operation convenience of the clamping mechanism is improved. The invention further provides a ventricular assist system.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a clamping mechanism and a ventricular assist system. Background Art

[0002] A ventricular assist device is a device used to assist patients with severe ventricular insufficiency or heart failure to provide a certain amount of blood flow and blood pressure. The outlet tube of the ventricular assist device is connected to the aorta or pulmonary artery through an artificial blood vessel, and the clamping mechanism is used to fix the artificial blood vessel to the outlet tube of the ventricular assist device.

[0003] However, the operation of the traditional clamping mechanism is not convenient enough and needs to be improved. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a clamping mechanism and a ventricular assist system that can improve the convenience of operation. The embodiment of the present invention achieves the above purpose through the following technical solutions.

[0005] In a first aspect, the present invention provides a clamping mechanism, comprising:

[0006] A clamping ring, the clamping ring comprising a ring body and a limiting buckle ear; the ring body is provided with a notch, the ring body has a first end and a second end opposite to each other, the first end and the second end are spaced apart to form the notch; the limiting buckle ear is provided at the first end, and the limiting buckle ear is provided with a limiting buckle hole; and

[0007] A locking assembly, the locking assembly comprising a handle and a connecting arm, the handle being rotatably connected to the second end; one end of the connecting arm being rotatably connected to the handle, and the other end of the connecting arm being provided with a movable buckle ear, the movable buckle ear being buckled with the limit buckle ear and being able to move in the limit buckle hole;

[0008] When the handle is rotated, it can drive the movable buckle ear of the connecting arm to move in the limiting buckle hole to adjust the distance between the first end and the second end, thereby adjusting the inner diameter of the ring body.

[0009] In one embodiment, the limiting buckle ear includes an abutment column and a surrounding plate, the abutment column is protruding from the ring body, the surrounding plate is connected to the abutment column, and the surrounding plate, the abutment column and the ring body jointly surround the limiting buckle hole; the movable buckle ear can abut against the abutment column, and the handle can pull the abutment column through the movable buckle ear to shorten the distance between the first end and the second end.

[0010] In one embodiment, the enclosure has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, and the abutment column is arranged on the outer circumferential surface of the ring body, wherein: the second connection end is fixedly connected to the outer circumferential surface of the ring body; or, the abutment column is arranged on the outer circumferential surface of the ring body, and the second connection end is separated from the outer circumferential surface of the ring body by a distance.

[0011] In one embodiment, the abutment column is arranged on the outer circumferential surface of the ring body, and the enclosure plate extends along an arc in the circumferential direction of the ring body. The enclosure plate has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, the first connection end is spaced a first distance from the outer circumferential surface of the ring body, and the end of the second connection end is spaced a second distance from the outer circumferential surface of the ring body, and the second distance is smaller than the first distance.

[0012] In one embodiment, a step portion is provided at one end of the abutment column away from the ring body, and the step portion has a connected step bottom surface and a step side surface, the step bottom surface faces away from the ring body, and the enclosure has a first connecting end, the first connecting end is connected to the abutment column, the first connecting end has a connected inner surface and a first end surface, the inner surface abuts against the step bottom surface, and the first end surface abuts against the step side surface.

[0013] In one embodiment, the step portion further has a step top surface facing away from the ring body, the step top surface is connected to the step side surface, and the first connecting end further has an outer surface facing away from the inner surface, the outer surface is flush with the step top surface.

[0014] In one embodiment, the enclosure has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, and the second connection end has a second end surface, wherein:

[0015] The second end face is configured as an arcuate face and is fitted and fixedly connected to the outer peripheral surface of the ring body; or, the second end face is an arcuate face or an inclined face so that the second end face faces the ring body and is spaced a distance from the outer surface of the ring body.

[0016] In one embodiment, the movable buckle ear is provided with a movable buckle hole for the limiting buckle ear to pass through, wherein:

[0017] The axial length of the abutment column of the ring body is smaller than the axial width of the movable buckle hole of the ring body; and / or, the enclosure has a first connecting end, which is connected to the abutment column, and the axial length of the first connecting end of the ring body is equal to the axial length of the abutment column of the ring body.

[0018] In one embodiment, a radially thickened portion is provided on the outer circumferential surface of the first end of the ring body, and the radially thickened portion has a first surface facing away from the outer circumferential surface of the ring body, and the projection of the abutment column along its length direction is located within the boundary of the first surface; the first surface has a first side edge away from the second end of the ring body, and the end face of the abutment column at one end fixed to the first surface has a second side edge, and the second side edge is located on the side of the abutment column away from the second end of the ring body, and the first side edge is spaced a distance from the second side edge.

[0019] An arc-shaped or inclined transition step surface is formed between the outer peripheral surface of the ring body and a side of the first surface away from the second end.

[0020] In one embodiment, the enclosure has a first connecting end and a second connecting end away from the first connecting end, the first connecting end is connected to the abutment column, the enclosure has an arc-shaped guide surface, the guide surface extends from the second connecting end to the first connecting end, and the movable buckle ear can slide along the guide surface.

[0021] In one embodiment, the position-limiting buckle hole extends a certain length along the circumference of the ring body, so that the movable buckle ear can also move along the circumference of the ring body in the position-limiting buckle hole.

[0022] In one embodiment, the limiting buckle hole is a through hole that penetrates the limiting buckle ear along the axial direction of the ring body, and the movable buckle ear is a buckle ring or a buckle hook that is inserted through the through hole.

[0023] In one embodiment, the clamping mechanism further has at least one of the following features:

[0024] The ring body is provided with a plurality of suture holes, and the plurality of suture holes are arranged between the first end and the second end along the circumference of the ring body;

[0025] The handle is rotatably connected to the second end via a pin shaft, and the side surface of the second end is provided with an axial protrusion that can abut against the outlet tube of the ventricular assist device, and the axial protrusion is provided with an avoidance groove, which corresponds to the position of the pin shaft so that the pin shaft can be installed to the second end of the ring body from the avoidance groove.

[0026] In one embodiment, a pressing protrusion extending toward the second end is provided on the end surface of the first end, the pressing protrusion is arranged in the notch, the pressing protrusion has a pressing surface close to the central axis of the ring body, and the pressing surface smoothly transitions with the inner circumference of the ring body.

[0027] In a second aspect, the present invention also provides a ventricular assist system, comprising a ventricular assist device, an artificial blood vessel and any one of the above-mentioned clamping mechanisms, wherein the ventricular assist device is provided with an outlet tube, the artificial blood vessel is sleeved on the outlet tube, the ring body of the clamping mechanism is sleeved on the artificial blood vessel, and the locking assembly can lock the artificial blood vessel to the outlet tube.

[0028] Compared with the prior art, the clamping mechanism and ventricular assist system provided by the present invention make the inner diameter of the ring body adjustable by setting a notch in the ring body; by setting a limit buckle ear at the first end of the ring body, and setting a movable buckle ear at one end of the connecting arm of the locking assembly, the movable buckle ear is interlocked with the limit buckle ear, so that the connecting arm and the limit buckle ear of the clamping ring are always connected. Compared with the traditional clamping mechanism, which manually interlocks the connecting arm with the hook on the clamping ring and then turns the handle to adjust the inner diameter of the ring body, the present application interlocks the movable buckle ear of the connecting arm with the limit buckle ear of the clamping ring, so that the operator does not need to manually interlock the connecting arm with the hook on the clamping ring, but can directly drive the connecting arm to move by turning the handle, so that the movable buckle ear moves in the limit buckle hole, thereby adjusting the inner diameter of the ring body, thereby improving the convenience of operation of the clamping mechanism.

[0029] These and other aspects of the present invention will become more apparent from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the structure of the ventricular assist system provided by the present invention.

[0032] Figure 2 It is an assembly diagram of the clamping mechanism and the artificial blood vessel provided by the present invention.

[0033] Figure 3 It is a schematic structural diagram of the clamping mechanism provided in the first embodiment of the present invention.

[0034] Figure 4 yes Figure 3 The structure diagram of the clamping mechanism shown is shown in another perspective.

[0035] Figure 5 yes Figure 3 The structure diagram of the clamping mechanism shown is from another viewing angle.

[0036] Figure 6 yes Figure 5A partial enlarged view at P1.

[0037] Figure 7 yes Figure 5 A local enlarged view at P2.

[0038] Figure 8 yes Figure 3 A partial exploded view of the clamping mechanism is shown.

[0039] Fig. 9 yes Figure 3 An exploded view of a portion of the clamping mechanism (excluding the locking assembly) is shown.

[0040] Fig.10 yes Fig. 9 The structure diagram of the clamping mechanism shown is shown in another perspective.

[0041] Fig.11 yes Figure 3 Another partial exploded view of the clamping mechanism is shown.

[0042] Fig.12 yes Figure 2 The clamping mechanism and the exploded view of the artificial blood vessel are shown.

[0043] Fig.13 yes Figure 2 A front view of the clamping mechanism and the artificial blood vessel is shown.

[0044] Fig.14 yes Fig.13 Cross-sectional view along the AA direction.

[0045] Fig.15 It is a schematic structural diagram of a clamping mechanism provided in the second embodiment of the present invention.

[0046] Fig.16 yes Fig.15 A partial enlarged view at P3.

[0047] The above drawings include the following reference numerals:

[0048] 1. ventricular assist system; 10. clamping mechanism; 100. clamping ring; 110. ring body; 111. outer peripheral surface; 1112. second surface; 1113. transition step surface; 112. inner peripheral surface; 114. notch; 116. second end; 1161. avoidance groove; 1162. axial convex plate; 1163. avoidance groove; 117. pin shaft; 118. first end; 1181. press-fit protrusion; 1182. radial thickening portion; 1183. first end a surface; 1184, a pressed surface; 1185, a first side edge; 119, a suture hole; 1191, a first opening; 1192, a second opening; 120, a stop buckle ear; 122, abutting column; 1221, a step portion; 1223, a step bottom surface; 1225, a step side surface; 1227, a step top surface; 1228, a second side edge; 124, a panel; 1241, a first connecting end; 1243, an inner surface; 1245, a first end surface; 1246, guide surface; 1247, outer surface; 1248, second connecting end; 1249, second end surface; 126, limit button hole; 130, locking assembly; 131, handle; 1312, rotating end; 1314, free end; 1315, avoidance groove; 133, connecting arm; 1332, movable buckle ear; 1334, movable buckle hole; 140, fixing ring; 143, annular groove; 145, assembly through hole; 147, limit boss; 148. Guide protrusion; 1481. Guide surface; 1483. Limiting surface; 160. Sealing ring; 161. Guide slope; 162. Annular protrusion; 164. Assembly protrusion; 20. Ventricular assist device; 21. Outlet pipe; 23. Pump body; 40. Artificial blood vessel; 41. Main pipe section; 43. Connecting pipe section; 45. Folded pipe section; 60. Vascular sheath; 61. Mounting hole; L. Center axis; D1. First distance; D2. Second distance. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the embodiments of the present invention, the embodiments of the present invention will be described more comprehensively with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the embodiments of the present invention herein are only for the purpose of describing specific implementations and are not intended to limit the present invention.

[0051] The inventor of the present application found that when a doctor operates the existing clamping mechanism during surgery, he needs to first engage the connecting arm of the clamping mechanism with the hook on the clamping ring, and then rotate the handle to drive the clamping ring to lock, so as to fix the artificial blood vessel to the outlet tube of the ventricular assist device. That is, the doctor needs to manually engage the connecting arm with the hook before rotating the handle, and the operation of the clamping mechanism is not convenient enough, which indirectly affects the progress of the surgery.

[0052] To this end, the present application proposes a clamping mechanism and a ventricular assist system, which provide a limit buckle ear on the outer periphery of the ring body, and a movable buckle ear on the connecting arm of the locking assembly, and the limit buckle ear and the movable buckle ear are interlocked, so that the operator does not need to manually engage the connecting arm with the hook on the clamping ring, but can directly drive the connecting arm to move by turning the handle, so that the movable buckle ear and the limit buckle ear are against each other to adjust the inner diameter of the ring body, thereby improving the convenience of operation of the clamping mechanism. The clamping mechanism and the ventricular assist system provided by the present application are described in detail below in conjunction with the specific implementation methods and the drawings in the specification.

[0053] See also Figure 1 and Figure 2 The ventricular assist system 1 includes a clamping mechanism 10, a ventricular assist device 20 and an artificial blood vessel 40. The ventricular assist device 20 is provided with an outlet tube 21, the artificial blood vessel 40 is sleeved on the outlet tube 21, and the clamping mechanism 10 is sleeved on the artificial blood vessel 40. The clamping mechanism 10 can lock the artificial blood vessel 40 on the outlet tube 21.

[0054] In this embodiment, the clamping mechanism 10 is used to lock the artificial blood vessel 40. In other embodiments, the clamping mechanism 10 can also be used to lock other pipeline structures that need to transport liquids, which will not be described in detail here.

[0055] The ventricular assist device 20 further includes a pump body 23 , and the outlet tube 21 is connected to one side of the pump body 23 . An impeller is provided inside the pump body 23 , and blood can be pumped to the outlet tube 21 through the rotation of the impeller.

[0056] See also Figure 3 and Figure 4The clamping mechanism 10 includes a clamping ring 100 and a locking assembly 130. The clamping ring 100 includes a ring body 110 and a limiting buckle ear 120. The ring body 110 is provided with a notch 114. The ring body 110 has a first end 118 and a second end 116 opposite to each other. The first end 118 and the second end 116 are spaced apart to form the notch 114, so that the inner diameter of the ring body 110 is adjustable. The limiting buckle ear 120 is provided at the first end 118, and the limiting buckle ear 120 is provided with a limiting buckle hole 126. The locking assembly 130 includes a handle 131 and a connecting arm 133, wherein the handle 131 is rotatably connected to the second end 116; one end of the connecting arm 133 is rotatably connected to the handle 131, and the other end is provided with a movable buckle ear 1332, which is buckled with the limiting buckle ear 120 and can move in the limiting buckle hole 126; when the handle 131 rotates, it can drive the movable buckle ear 1332 of the connecting arm 133 to move in the limiting buckle hole 126 to adjust the distance between the first end 118 and the second end 116, that is, adjust the size of the notch 114, thereby adjusting the inner diameter of the ring body 110.

[0057] In the illustrated embodiment, the position-limiting buckle ear 120 and the handle 131 are both arranged on the outer circumference of the ring body 110. Since the outlet tube 21 of the ventricular assist device 20 and the artificial blood vessel 40 need to be inserted into the ring body 110, the position-limiting buckle ear 120 and the handle 131 are both arranged on the outer circumference of the ring body 110, which not only facilitates the operation of the clamping mechanism 10, but also enables the width of the notch 114 in the axial direction of the ring body 110 to be as equal as possible when the first end 118 and the second end 116 of the ring body 110 are subjected to force. If the limiting buckle ear 120 and the handle 131 are arranged on the side of the ring body 110, when the axial length of the ring body 110 is large, the side where the limiting buckle ear 120 and the handle 131 are arranged will be subjected to greater force, while the opposite side will be subjected to less force, which will cause the width of the notch 114 on the side subjected to greater force to be smaller, while the width of the notch 114 on the side subjected to less force to be larger; if the limiting buckle ear 120 and the handle 131 are arranged at the ends of the first end 118 and the second end 116 of the ring body 110, the notch 114 will be larger. In some embodiments, the limiting buckle ear 120 can also be set on the end surface of the ring body 110, such as the end surface of the first end 118. In this case, the handle 131 can still be set on the outer peripheral surface of the ring body 110, or other positions that are convenient for cooperation with the limiting buckle ear 120; in some embodiments, the limiting buckle ear 120 can also be set on the side of the ring body 110, and the handle 131 is also set on the side of the ring body 110. In order to make the width of the notch 114 in the axial direction of the ring body 110 as equal as possible when the first end 118 and the second end 116 are subjected to force, the axial width of the ring body 110 can be reduced, or a reinforcing structure can be set at the first end 118 and the second end 116.

[0058] In this embodiment, if Figure 3As shown, the axial direction of the ring body 110 refers to the extension direction of the central axis L of the ring body 110 ; the radial direction of the ring body 110 refers to the radius or diameter direction of the ring body 110 , and is perpendicular to the axial direction of the ring body 110 ; the circumferential direction of the ring body 110 refers to the circumferential direction along the ring body 110 .

[0059] Specifically, the clamping mechanism 10 is used to lock the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20, wherein one end of the artificial blood vessel 40 is connected to the outlet tube 21, and the other end is connected to the aorta or pulmonary artery of the heart, so that blood can be transported from the ventricle to the aorta or pulmonary artery through the operation of the ventricular assist device 20.

[0060] The locking assembly 130 has an unlocked state and a locked state. When the locking assembly 130 is in the unlocked state, the inner diameter of the ring body 110 increases, and the locking of the artificial blood vessel 40 is released, and the artificial blood vessel 40 can be separated from the outlet tube 21. When the locking assembly 130 is in the locked state, the inner diameter of the ring body 110 decreases, and the locking assembly 130 locks the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20. It should be noted that since the limit buckle ear 120 is buckled with the movable buckle ear 1332, the movable buckle ear 1332 of the connecting arm 133 is always connected to the limit buckle ear 120 of the ring body 110 regardless of whether the locking assembly 130 is in the unlocked state or the locked state, and there is no situation where the movable buckle ear 1332 is separated from the limit buckle ear 120.

[0061] See also Figure 1 , Figures 3 to 5 The ring body 110 is generally in the shape of a ring and can be sleeved on the outer circumference of the artificial blood vessel 40, and the inner diameter of the ring body 110 can be adjusted by the locking assembly 130. The reduction of the inner diameter of the ring body 110 can fix the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20; the increase of the inner diameter of the ring body 110 can separate the artificial blood vessel 40 from the outlet tube 21 of the ventricular assist device 20.

[0062] The ring body 110 has an outer peripheral surface 111 and an inner peripheral surface 112 opposite to the outer peripheral surface 111, wherein the inner peripheral surface 112 can be against the artificial blood vessel 40, and the outer peripheral surface 111 can be used to set structures such as the limit buckle ear 120 and the handle 131. In this embodiment, both the inner peripheral surface 112 and the outer peripheral surface 111 can be connected to the artificial blood vessel 40.

[0063] The ring body 110 has a notch 114, which penetrates the side wall of the ring body 110 and communicates with the inner hole of the ring body 110, so that the ring body 110 is an open structure, so that the inner diameter of the ring body 110 can be adjusted. The notch 114 set on the ring body 110 forms a first end 118 and a second end 116 opposite to each other on the ring body 110, wherein the second end 116 and the first end 118 can be used to set the handle 131 and the limit buckle ear 120 respectively. When the first end 118 and the second end 116 are close to each other, the inner diameter of the ring body 110 is reduced; when the first end 118 and the second end 116 are away from each other, the inner diameter of the ring body 110 is increased. In order to increase the strength of the ring body 110, the thickness of the first end 118 and the second end 116 of the ring body 110 is greater than the thickness of other positions of the ring body 110.

[0064] A pressing protrusion 1181 extending toward the second end 116 is provided on the end face of the first end 118, and the pressing protrusion 1181 is arranged in the notch 114. The pressing protrusion 1181 has a pressing surface 1184 close to the central axis L of the ring body 110, and the pressing surface 1184 smoothly transitions with the inner circumference 112 of the ring body 110, so that the pressing surface 1184 and the inner circumference 112 of the ring body 110 can both abut against the artificial blood vessel 40 to press the artificial blood vessel 40, thereby avoiding the situation where the part of the artificial blood vessel 40 corresponding to the notch 114 is not pressed due to the notch 114 of the ring body 110, thereby achieving 360° compression of the artificial blood vessel 40 as much as possible, reducing the probability of blood leaking from between the artificial blood vessel 40 and the outlet tube 21.

[0065] In this embodiment, the second end 116 is provided with an avoidance groove 1161, the position of the avoidance groove 1161 corresponds to the position of the pressing protrusion 1181, and the avoidance groove 1161 can avoid the pressing protrusion 1181. Specifically, when the inner diameter of the ring body 110 is reduced, the width of the notch 114 is reduced, and the pressing protrusion 1181 can extend into the avoidance groove 1161, so as to prevent the pressing protrusion 1181 from being stopped by the second end 116 and the inner diameter of the ring body 110 from being reduced. At the same time, in the process of reducing the distance between the first end 118 and the second end 116 of the ring body 110, the pressing protrusion 1181 can partially extend into the avoidance groove 1161, so that the pressing protrusion 1181 can have a longer length in the circumferential direction of the ring body 110, thereby being more conducive to achieving 360° compression of the artificial blood vessel 40. It can be understood that when the locking assembly 130 is in the locked state, the pressing protrusion 1181 can be partially located in the avoidance groove 1161, or can be outside the avoidance groove 1161. If the pressing protrusion 1181 is outside the avoidance groove 1161, the end of the pressing protrusion 1181 away from the first end 118 is as close as possible to the notch of the avoidance groove 1161 in the circumferential direction of the ring body 110. In some embodiments, the end of the end of the pressing protrusion 1181 away from the first end 118 is flush with the notch of the avoidance groove 1161 in the circumferential direction of the ring body 110.

[0066] See also Figures 4 to 7 The limiting buckle ear 120 is arranged on the outer peripheral surface 111 of the ring body 110, and the limiting buckle ear 120 is buckled with the movable buckle ear 1332, so that the connecting arm 133 is always connected with the limiting buckle ear 120 of the clamping ring 100. Compared with the traditional clamping mechanism which manually engages the connecting arm with the hook on the clamping ring and then rotates the handle to adjust the inner diameter of the ring body, the present application interlocks the movable buckle ear 1332 of the connecting arm 133 with the limiting buckle ear 120 of the clamping ring 100, so that the operator does not need to take the additional step of manually engaging the connecting arm 133 with the hook on the clamping ring. The operator only needs to directly rotate the handle 131 to drive the connecting arm 133 to move, so that the movable buckle ear 1332 of the connecting arm 133 which is engaged with the limiting buckle hole 120 can move in the limiting buckle hole 120, so as to drive the first end 118 and the second end 116 of the ring body 110 to approach each other, thereby adjusting the inner diameter of the ring body 110, thereby improving the operating convenience of the clamping mechanism 10 and avoiding affecting the progress of the operation as much as possible.

[0067] The position-limiting buckle hole 126 is a through hole that penetrates the position-limiting buckle ear 120 along the axial direction of the ring body 110, and the movable buckle ear 1332 is a buckle ring or a buckle hook that penetrates the through hole, and the movable buckle ear 1332 is always buckled with the position-limiting buckle ear 120. In some embodiments, the position-limiting buckle hole 126 can also be a blind hole that is recessed into the position-limiting buckle ear 120 along the axial direction of the ring body 110, and the movable buckle ear 1332 is a buckle hook inserted into the blind hole. For example, the blind hole formed by the position-limiting buckle hole 126 can be set as a guide rail. When the handle 131 is rotated, the buckle hook formed by the movable buckle ear 1332 can move in the guide rail, which can also meet the requirement that the movable buckle ear 1332 is always buckled with the position-limiting buckle ear 120.

[0068] In this embodiment, the position-limiting buckle ear 120 includes an abutting column 122 and a surrounding plate 124, and the abutting column 122 is convexly arranged on the ring body 110. The surrounding plate 124, the abutting column 122 and the ring body 110 jointly enclose a position-limiting buckle hole 126. For example, the surrounding plate 124, the abutting column 122 and the outer peripheral surface 111 of the ring body 110 jointly enclose the position-limiting buckle hole 126; the movable buckle ear 1332 can abut against the abutting column 122. The handle 131 can pull the abutting column 122 through the movable buckle ear 1332 to reduce the distance between the first end 118 and the second end 116, thereby reducing the inner diameter of the ring body 110. Specifically, the movable buckle ear 1332 can abut against the inner side of the abutting column 122, wherein the inner side of the abutting column 122 refers to the part of the abutting column 122 used to define the position-limiting buckle hole 126. In this embodiment, the enclosure 124 , the abutting column 122 and the ring body 110 can jointly form a closed position-limiting buckle hole 126 to prevent the movable buckle ear 1332 of the connecting arm 133 from being separated from the position-limiting buckle ear 120 .

[0069] In this embodiment, the abutting post 122 is protruded from the outer peripheral surface 111 of the ring body 110 . In other embodiments, the abutting post 122 is protruded from the side surface of the ring body 110 .

[0070] In this embodiment, the position-limiting buckle hole 126 is formed by the abutting column 122, the surrounding plate 124 and the ring body 110. In some embodiments, the position-limiting buckle ear 120 can also be a protrusion, the position-limiting buckle ear 120 is protruding from the outer peripheral surface 111 of the ring body 110, and the position-limiting buckle hole 126 is a hole opened on the position-limiting buckle ear 120. In other embodiments, the position-limiting buckle ear 120 can also be an annular structure protruding from the outer peripheral surface of the ring body 110, for example, a circular ring structure.

[0071] See also Figures 8 to 10 In this embodiment, the abutment column 122 is roughly in the shape of a rectangular parallelepiped. A step portion 1221 is provided at one end of the abutment column 122 away from the ring body 110, and the step portion 1221 is connected to one end of the enclosure 124. Specifically, the step portion 1221 is fixedly connected to one end of the enclosure 124. The step portion 1221 is provided on the side of the abutment column 122 away from the handle 131. Specifically, the step portion 1221 has a step bottom surface 1223 and a step side surface 1225 connected to each other, and the step bottom surface 1223 is away from the ring body 110.

[0072] The enclosure 124 is generally an arc-shaped plate-like structure. The enclosure 124 has a first connection end 1241, and the first connection end 1241 is connected to the abutment column 122. The first connection end 1241 of the enclosure 124 has a connected inner surface 1243 and a first end surface 1245, and the inner surface 1243 faces the outer peripheral surface 111 of the ring body 110 and abuts against the step bottom surface 1223. Among them, the inner surface 1243 of the first connection end 1241 is also the inner surface of the enclosure 124, that is, the surface of the enclosure 124 facing the ring body 110. The first end surface 1245 abuts against the step side surface 1225, so that the first connection end 1241 of the enclosure 124 can be adapted to the step portion 1221, and the enclosure 124 and the abutment column 122 are in surface-to-surface contact, which increases the contact area between the two, and is conducive to increasing the connection strength between the enclosure 124 and the abutment column 122. In this embodiment, the step bottom surface 1223 is substantially perpendicular to the step side surface 1225. In other embodiments, the angle between the step bottom surface 1223 and the step side surface 1225 may also be an acute angle or an obtuse angle.

[0073] The step portion 1221 also has a step top surface 1227 facing away from the ring body 110, and the step top surface 1227 is connected to the step side surface 1225; the first connecting end 1241 also has an outer surface 1247 facing away from the inner surface 1243, and the outer surface 1247 is connected to the first end surface 1245. The outer surface 1247 is flush with the step top surface 1227 along the circumference of the ring body 110, so that the top of the limiting buckle ear 120 is relatively flat, minimizing the sharp edges caused by unevenness, thereby avoiding damage to the operator as much as possible.

[0074] In this embodiment, the abutment column 122 and the first connection end 1241 of the enclosure 124 can be connected by welding. In other embodiments, the abutment column 122 and the first connection end 1241 of the enclosure 124 can also be connected by other methods such as bonding, or fixedly connected by welding on the basis of bonding.

[0075] The enclosure 124 also has a second connection end 1248 away from the first connection end 1241. The enclosure 124 extends along an arc in the circumferential direction of the ring body 110, the first connection end 1241 is spaced apart from the outer circumferential surface 111 of the ring body 110 by a first distance D1, and the end of the second connection end 1248 is spaced apart from the outer circumferential surface 111 of the ring body 110 by a second distance D2, and the second distance D2 is less than the first distance D1. In this embodiment, the second connection end 1248 is fixedly connected to the outer circumferential surface 111 of the ring body 110, that is, the second distance D2 is equal to zero.

[0076] Specifically, the second connection end 1248 has a second end face 1249, and the second end face 1249 is connected to the inner surface of the enclosure 124. In this embodiment, the second end face 1249 is set as an arc surface, and the second end face 1249 is fitted and fixed to the outer peripheral surface 111 of the ring body 110. Since the outer peripheral surface 111 of the ring body 110 is also an arc surface, the fitting of the two arc surfaces can increase the contact area between the two as much as possible, thereby increasing the connection strength between the enclosure 124 and the ring body 110. It should be noted that the second end face 1249 is also connected to the outer surface 1247. In this embodiment, the second end face 1249 and the outer peripheral surface 111 can be fixedly connected by welding. In other embodiments, the second end face 1249 and the outer peripheral surface 111 can also be connected by bonding, and the second connection end 1248 of the enclosure 124 can also be plugged into the ring body 110. The second connection end 1248 and the ring body 110 may also be connected in other ways, and the specific connection method may be set according to actual conditions.

[0077] The enclosure 124 further has an arc-shaped guide surface 1246, which is a part of the inner surface of the enclosure 124. The guide surface 1246 extends from the second connection end 1248 to the first connection end 1241, that is, in the illustrated embodiment, the guide surface 1246 extends from one end of the connecting ring body 110 of the enclosure 124 to one end of the enclosure 124 connected to the abutment column 122. The movable buckle ear 1332 can slide along the guide surface 1246, so that the movable buckle ear 1332 moves more smoothly in the limit buckle hole 126 to cooperate with the rotation of the handle 131, thereby further improving the convenience of operation of the clamping mechanism 10. In addition, the guide surface 1246 of the enclosure 124 is set to an arc shape, and compared with the inclined surface, the width of the limit buckle hole 126 is larger, which is conducive to the rotation of the movable buckle ear 1332 in the limit buckle hole 126. In other embodiments, the guide surface 1246 may also be configured as an inclined surface to guide the movable buckle ear 1332 to slide in the limiting buckle hole 126 .

[0078] See also Figures 5 to 7 The outer circumference of the first end 118 of the ring body 110 is provided with a radial thickening portion 1182, and the radial thickening portion 1182 protrudes from the outer circumference 111 of the ring body 110 in a direction away from the central axis L of the ring body 110. The pressing protrusion 1181 is provided on the end surface of the radial thickening portion 1182 facing the second end 116. The radial thickening portion 1182 increases the thickness of the first end 118 along the radial direction of the ring body 110, thereby increasing the strength of the first end 118 and reducing the probability of deformation or bending of the first end 118 under the action of external force.

[0079] The radially thickened portion 1182 has a first surface 1183 away from the outer circumferential surface 111 of the ring body 110, and the abutment column 122 is fixedly connected to the first surface 1183. The outer circumferential surface 111 of the ring body 110 includes a second surface 1112 corresponding to the position-limiting buckle hole 126, that is, the second surface 1112 is a part of the hole wall of the position-limiting buckle hole 126.

[0080] See also Figures 8 to 10The projection of the abutment column 122 along its length direction is located within the boundary of the first surface 1183, so that the projection of the abutment column 122 on the first surface 1183 does not exceed the boundary of the first surface 1183, and the cross-sectional area of ​​the abutment column 122 is not greater than the area of ​​the first surface 1183. In this embodiment, the first surface 1183 has a first side 1185 away from the second end 116 of the ring body 110, and the end face of the abutment column 122 at one end fixed to the first surface 1183 has a second side 1228, and the second side 1228 is located on the side of the abutment column 122 away from the second end 116 of the ring body 110, and the first side 1185 is spaced a distance from the second side 1228, so that in the circumferential direction of the ring body 110, there is at least a partial radial thickening portion 1182 between the abutment column 122 and the ring body 110, that is, the abutment column 122 and the ring body 110 are transitionally connected through at least a partial radial thickening portion 1182, and the abutment column 122 and the ring body 110 are not directly fixed. Furthermore, by spacing the first side edge 1185 and the second side edge 1228 by a certain distance, when the inner diameter of the ring body 110 is reduced, the stress at the connection between the abutment column 122 and the ring body 110 is dispersed, thereby avoiding stress concentration at the connection between the abutment column 122 and the ring body 110, thereby reducing or avoiding the possibility of fracture at the joint between the abutment column 122 and the radial thickened portion 1182, and improving the service life of the clamping mechanism 10.

[0081] In this embodiment, an arc-shaped or inclined transition step surface 1113 is formed between the outer peripheral surface 111 of the ring body 110 and the side of the first surface 1183 away from the second end 116 of the ring body 110, that is, a transition step surface 1113 is formed between the second surface 1112 and the first surface 1183, and the transition step surface 1113 is set as an arc-shaped surface or an inclined surface, so that when the handle 131 pulls the first end 118 toward the second end 116, the transition step surface 1113 can further disperse the stress at the junction of the radial thickened portion 1182 and the ring body 110. In addition, in some embodiments, when the handle 131 pulls the first end 118 toward the second end 116, the movable buckle ear 1332 can move along the second surface 1112, the transition step surface 1113 and the first surface 1183 in sequence, so that the transition step surface 1113 can guide the movable buckle ear 1332 to move in the limiting buckle hole 126, and the transition step surface 1113 is set as an arc surface or a slope, so that the movement of the movable buckle ear 1332 is smoother, thereby further improving the operational convenience of the clamping mechanism 10.

[0082] The handle 131 is generally an arc-shaped plate-like structure, and the handle 131 can be rotatably connected to the second end 116 of the clamping ring 100 through the pin 117. Specifically, when the handle 131 is opened, the end of the handle 131 away from the ring body 110 moves in a direction away from the ring body 110, and at this time, the locking assembly 130 is in an unlocked state. When the handle 131 is buckled, the end of the handle 131 away from the ring body 110 moves in a direction close to the ring body 110, and at this time, the locking assembly 130 is in a locked state. In this embodiment, the curvature of the handle 131 is the same as the curvature of the ring body 110, so that when the handle 131 is buckled, the handle 131 can be as close to the ring body 110 as possible, which can reduce the overall size of the clamping mechanism 10 and reduce the contact between the clamping mechanism 10 and other organs in the body. In addition, the curvature of the handle 131 is the same as that of the ring body 110, which can also prevent the handle 131 from opening too much relative to the ring body 110 in the locked state, thereby preventing the locking assembly 130 from being unlocked by accidentally touching the handle 131. That is, accidentally touching the handle 131 to unlock the locking assembly 130 can be avoided as much as possible.

[0083] An axial convex plate 1162 that can abut against the outlet tube 21 of the ventricular assist device 20 is protruded from the side surface of the second end 116. The axial convex plate 1162 is generally a rectangular plate-shaped structure and protrudes from the side surface of the second end 116 along the axial direction of the ring body 110. The axial convex plate 1162 can abut against the outlet tube 21 of the ventricular assist device 20 along the circumferential direction of the ring body 110, so that when the clamping mechanism 10 fixes the artificial blood vessel 40 to the outlet tube 21, the clamping mechanism 10 can limit the rotation of the clamping mechanism 10 along the circumferential direction of the ring body 110 through the abutment between the axial convex plate 1162 and the outlet tube 21, which is conducive to the fixation of the artificial blood vessel 40.

[0084] Please continue reading Figure 7 , the plate surface of the axial protrusion 1162 that is away from the central axis L of the ring body 110 is provided with an avoidance groove 1163, and the avoidance groove 1163 corresponds to the position of the pin 117 to avoid the installation of the pin 117, so that the pin 117 can be installed to the second end 116 of the ring body 110 from the avoidance groove 1163, reducing the difficulty of assembling the handle 131. Among them, the avoidance groove 1163 corresponds to the position of the pin 117, which means that the positive projection of the central axis of the pin 117 on the axial protrusion 1162 is located at the bottom surface of the groove of the avoidance groove 1163, that is, the avoidance groove 1163 and the pin 117 are not staggered along the circumferential direction of the ring body 110.

[0085] See also Figure 4The handle 131 includes a rotating end 1312 and a free end 1314, wherein the rotating end 1312 can be rotatably connected to the ring body 110 through the pin 117, and the free end 1314 and the rotating end 1312 are located at opposite ends of the handle 131, and the free end 1314 is convenient for the operator to rotate the handle 131. In order to further facilitate the operator to rotate the handle 131, a side of the free end 1314 close to the outer peripheral surface 111 of the ring body 110 is further provided with an avoidance groove 1315. When the locking assembly 130 is in the locked state, the handle 131 is as close to the ring body 110 as possible, and the avoidance groove 1315 is provided to facilitate the operator's fingers to enter, thereby further facilitating the operator to rotate the handle 131.

[0086] The connecting arm 133 is generally an L-shaped plate structure. The connecting arm 133 can be rotatably connected to the handle 131 through the pin 117. It should be noted that the connecting arm 133 is connected to the side of the handle 131 close to the clamping ring 100. The connecting arm 133 is set at a position corresponding to the notch 114. When the handle 131 drives the connecting arm 133 to move, the movable buckle ear 1332 of the connecting arm 133 is abutted against the limit buckle ear 120. As the handle 131 continues to rotate, the connecting arm 133 drives the first end 118 to move toward the second end 116, thereby reducing the width of the notch 114 and the inner diameter of the ring body 110, thereby achieving the locking of the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20.

[0087] The movable buckle ear 1332 is provided with a movable buckle hole 1334 for the limiting buckle ear 120 to pass through, and the axial length of the abutment column 122 in the ring body 110 is smaller than the axial width of the movable buckle hole 1334 in the ring body 110, so that the movable buckle ear 1332 can move relative to the abutment column 122 under the drive of the handle 131, so that the rotation of the handle 131 is smoother. The hole wall of the movable buckle hole 1334 that abuts against the abutment column 122 is adapted to the shape of the cross section of the abutment column 122, that is, the surface of the abutment column 122 that abuts against the movable buckle ear 1332 and the surface of the movable buckle ear 1332 that abuts against the abutment column 122 are contoured surfaces to each other, so that when the operator rotates the handle 131 to make the limiting buckle ear 120 abut against the movable buckle ear 1332, the contact area between the abutment column 122 and the movable buckle ear 1332 can be increased, thereby reducing the contact stress between the limiting buckle ear 120 and the movable buckle ear 1332 when the locking assembly 130 is in the locked state, thereby reducing damage to the connecting arm 133 and the limiting buckle ear 120.

[0088] In this embodiment, the axial length of the first connecting end 1241 in the ring body 110 is equal to the axial length of the abutting column 122 in the ring body 110, and the axial length of the abutting column 122 in the ring body 110 can be increased as much as possible, thereby increasing the area of ​​the connection between the abutting column 122 and the first connecting end 1241, and improving the connection strength between the abutting column 122 and the ring body 110.

[0089] The position-limiting buckle hole 126 extends a certain length along the circumference of the ring body 110, so that the movable buckle ear 1332 can also move along the circumference of the ring body 110 in the position-limiting buckle hole 126, that is, the movable buckle ear 1332 can not only slide along the guide surface 1246 in the position-limiting buckle hole 126, but also move along the circumference of the ring body 110, so that the movable buckle ear 1332 is more flexible, avoiding the handle 131 connected to the connecting arm 133 from getting stuck during the rotation process, improving the smoothness of the rotation of the handle 131, and further improving the convenience of operation of the clamping mechanism 10. The movable buckle ear 1332 can rotate and move in the position-limiting buckle hole 126, and the movable buckle ear 133 can also contact each hole wall of the position-limiting buckle hole 126.

[0090] In this embodiment, during the circumferential movement of the movable buckle ear 1332 along the ring body 110 in the limiting buckle hole 126, the movable buckle ear 1332 contacts the second surface 1112, the transition step surface 1113 and the first surface 1183 in sequence. Since the transition step surface 1113 is set as an arc-shaped surface, when the handle 131 pulls the first end 118 toward the second end 116, the transition step surface 1113 can guide the movable buckle ear 1332 to move in the limiting buckle hole 126, so that the movement of the movable buckle ear 1332 is smoother.

[0091] The width of the movable buckle hole 1334 along the circumference of the ring body 110 is greater than the width of the abutment column 122 along the circumference of the ring body 110. Such a design allows the abutment column 122 to move in the movable buckle hole 1334, so that the movement process of the handle 131 driving the connecting arm 133 is smoother, reducing the operating difficulty of the clamping mechanism 10.

[0092] See also Figures 10 to 14The clamping ring 100 is provided with a suture hole 119. Specifically, the suture hole 119 is provided in the ring body 110, and the artificial blood vessel 40 can be sutured and connected with the clamping ring 100 through the suture hole 119. The suturing of the artificial blood vessel 40 and the clamping ring 100 can be completed before the operation, which can reserve sufficient suturing time for the operator to sew the artificial blood vessel 40 to the clamping ring 100, and then the artificial blood vessel 40 can be fixed to the outlet tube 21 by adjusting the locking assembly 130, avoiding the cumbersome operation of tying the artificial blood vessel 40 to the outlet tube 21 with a binding wire during the operation, and naturally avoiding the phenomenon of loose tying caused by confusion or unskilled techniques during the operation, thereby improving the efficiency of assembly and disassembly of the artificial blood vessel 40 and the stability of the connection between the artificial blood vessel 40 and the outlet tube 21 of the ventricular assist device 20. The artificial blood vessel 40 is sutured to the clamping ring 100 through the suture holes 119 on the clamping ring 100 , so that the artificial blood vessel 40 is fixedly connected to the clamping mechanism 10 , and no additional locking structure is needed to fix the two together, thereby simplifying the structure of the clamping mechanism 10 .

[0093] The suture hole 119 passes through the circumferential wall of the ring body 110. In the present embodiment, the suture hole 119 passes through the circumferential wall of the clamping ring 100 along the radial direction of the ring body 110, that is, the suture hole 119 is a straight hole; in other embodiments, the suture hole 119 can also be an oblique hole. The suture hole 119 has a first opening 1191 and a second opening 1192 opposite to each other, wherein the first opening 1191 is provided on the inner circumferential surface 112 of the ring body 110, and the second opening 1192 is provided on the outer circumferential surface 111 of the ring body 110. In other embodiments, the first opening 1191 and the second opening 1192 of the suture hole 119 can be provided on the inner circumferential surface 112 of the ring body 110, or both can be provided on the outer circumferential surface 111 of the ring body 110, so as to meet the purpose of suturing and connecting the artificial blood vessel 40 with the clamping ring 100 through the suture hole 119 on the clamping ring 100.

[0094] In this embodiment, there are multiple suture holes 119, which are arranged between the first end 118 and the second end 116 along the circumference of the ring body 110, so that the sutures passing through the suture holes 119 can be arranged along the circumference of the ring body 110, thereby making the overall structure of the clamping mechanism 10 more compact. In this embodiment, all suture holes 119 are arranged in a circle along the circumference of the ring body 110. In other embodiments, in addition to some suture holes 119 being arranged in a circle along the circumference of the ring body 110, some suture holes 119 can also be arranged at other positions of the clamping ring 100, as long as the sutures can pass through.

[0095] In other embodiments, the clamping ring 100 may not be provided with the suture hole 119, and the artificial blood vessel 40 may be connected to the clamping ring 100 by bonding. In other embodiments, the artificial blood vessel 40 may be connected to the clamping ring 100 by bonding and suturing at the same time, which may be set according to actual conditions.

[0096] See also Fig.11 and Fig.12 The clamping mechanism 10 further includes a fixing ring 140, which is arranged with the ring body 110 along the axial direction of the ring body 110 and fixedly connected with the portion of the ring body 110 between the first end 118 and the second end 116. The fixing ring 140 can also be sleeved on the outlet tube 21 of the ventricular assist device 20. When the clamping mechanism 10 is installed on the outlet tube 21, the outlet tube 21 first cooperates with the clamping ring 100 and then cooperates with the fixing ring 140, that is, the clamping ring 100 is arranged near the inner side of the outlet tube 21, and the fixing ring 140 is arranged near the tube mouth of the outlet tube 21. The clamping mechanism 10 further includes a sealing ring 160, which is arranged at one end of the fixing ring 140 away from the ring body 110 and located on the inner wall of the fixing ring 140. The sealing ring 160 can be used to seal and contact with the artificial blood vessel 40, improve the sealing performance of the assembly between the artificial blood vessel 40 and the fixing ring 140, and prevent blood from leaking from between the artificial blood vessel 40 and the outlet tube 21.

[0097] In this embodiment, the sealing ring 160 can be a rubber ring, which has a deformable function and can achieve a sealing effect through deformation. Therefore, the rubber ring is fixed to the inner circumference of the fixing ring 140 and can be located between the artificial blood vessel 40 and the fixing ring 140. It can be deformed in the extruded state when the artificial blood vessel 40 and the fixing ring 140 are mutually sleeved and assembled, providing a good sealing effect. In other embodiments, the sealing ring 160 can also be a structure made of silicone or other materials with a certain degree of elasticity.

[0098] See also Fig.13 and Fig.14 At least part of the inner wall of the sealing ring 160 may also be provided with a guiding slope 161. The guiding slope 161 has a guiding function and can guide the clamping mechanism 10 in the process of being sleeved on the outlet pipe 21, so as to facilitate the installation of the clamping mechanism 10 on the outlet pipe 21 and avoid the sealing ring 160 and the outlet pipe 21 being in an abutting assembly state, which causes the clamping mechanism 10 to be unable to be smoothly sleeved on the outlet pipe 21. The inner wall of the sealing ring 160 forms the guiding slope 161, which also makes the sealing ring 160 abut against the artificial blood vessel 40, reducing the probability of blood leakage from between the artificial blood vessel 40 and the outlet pipe 21.

[0099] In this embodiment, the inner diameter of the end of the sealing ring 160 close to the ring body 110 is gradually reduced along the direction from the ring body 110 to the fixing ring 140, so as to form the above-mentioned guiding inclined surface 161 on the inner wall of the sealing ring 160. Specifically, when the clamping mechanism 10 is installed on the outlet tube 21, the clamping mechanism 10 moves along the direction from the fixing ring 140 to the clamping ring 100, and the gap between the sealing ring 160 and the outlet tube 21 becomes smaller and smaller until the artificial blood vessel 40 abuts between the sealing ring 160 and the outlet tube 21, so that the sealing performance of the assembly between the artificial blood vessel 40 and the fixing ring 140 can be improved, and blood leakage from between the artificial blood vessel 40 and the outlet tube 21 can be prevented.

[0100] Please continue reading Fig.11 and Fig.12 In this embodiment, the inner wall of the fixing ring 140 is provided with an annular groove 143, and the outer wall of the sealing ring 160 is provided with an annular protrusion 162. The sealing ring 160 is assembled with the annular groove 143 of the fixing ring 140 through the annular protrusion 162, so that the fixing ring 140 and the sealing ring 160 are stably sleeved and assembled together. Among them, the number of the annular groove 143 and the annular protrusion 162 is the same, and can be set to one or more. In addition, the fixing ring 140 is also provided with an assembly through hole 145, which is arranged on the groove bottom surface of the annular groove 143. The side of the annular protrusion 162 that is away from the inner surface 1243 of the sealing ring 160 is provided with an assembly protrusion 164, and the assembly protrusion 164 cooperates with the assembly through hole 145, so that the clamping ring 100 and the sealing ring 160 are stably sleeved and assembled together. Among them, the number of the assembly through hole 145 and the assembly protrusion 164 is the same, and can be set to one or more. In other embodiments, the sealing ring 160 may also be integrally injection molded with the fixing ring 140 , which is not limited here.

[0101] In this embodiment, the artificial blood vessel 40 includes a main body pipe section 41 and a connecting pipe section 43, wherein the connecting pipe section 43 is connected to one end of the main body pipe section 41, and is disposed in the clamping ring 100, and is sutured and connected to the clamping ring 100 through the suture hole 119 on the clamping ring 100. The connecting pipe section 43 can cover the first opening 1191, so that the suture thread passes through the suture hole 119 and the connecting pipe section 43, thereby realizing the suture connection between the artificial blood vessel 40 and the clamping mechanism 10.

[0102] In this embodiment, the artificial blood vessel 40 further includes a folded tube segment 45, which is connected to one end of the connecting tube segment 43 away from the main tube segment 41, and the folded tube segment 45 can be folded outward relative to the connecting tube segment 43 to cover the side of the suture hole 119 away from the connecting tube segment 43. That is, the folded tube segment 45 can cover the second opening 1192 of the suture hole 119, so that the suture can pass through the folded tube segment 45, the suture hole 119 and the connecting tube segment 43 in sequence to suture the folded tube segment 45 and the clamping ring 100, thereby increasing the connection strength between the artificial blood vessel 40 and the clamping mechanism 10.

[0103] Please also read Figure 1 The ventricular assist system 1 further includes a vascular sheath 60, which is connected to the fixing ring 140 and is sleeved on the outer periphery of the artificial blood vessel 40. The vascular sheath 60 can be made of a hard material with a certain hardness to protect the artificial blood vessel 40 and prevent the artificial blood vessel 40 from being flattened and affecting the flow of blood. The vascular sheath 60 is provided with a plurality of mounting holes 61, which are arranged along the circumference of the fixing ring 140, and the vascular sheath 60 can be connected to the fixing ring 140 through the plurality of mounting holes 61.

[0104] A limiting boss 147 is further provided at one end of the fixing ring 140 close to the clamping ring 100 . The limiting boss 147 can be used to limit the position of the vascular sheath 60 to restrict the axial movement of the vascular sheath 60 along the fixing ring 140 .

[0105] A guide protrusion 148 is further provided at one end of the fixing ring 140 away from the clamping ring 100, and the guide protrusion 148 is spaced apart from the limiting boss 147. The guide protrusion 148 can guide the vascular sheath 60 to guide the end of the vascular sheath 60 to between the limiting boss 147 and the guide protrusion 148. In this embodiment, there are a plurality of guide protrusions 148, and the plurality of guide protrusions 148 are arranged along the circumference of the fixing ring 140, and each guide protrusion 148 can be embedded in one mounting hole 61.

[0106] The guide protrusion 148 includes a guide surface 1481 and a limiting surface 1483 connected to each other, wherein the guide surface 1481 is an inclined surface, and the guide surface 1481 extends from the end of the fixing ring 140 to a direction away from the central axis of the fixing ring 140 to guide the vascular sheath 60, wherein the central axis of the fixing ring 140 coincides with the central axis L of the ring body 110. The limiting surface 1483 is connected to the outer peripheral surface 111 of the fixing ring 140, and the limiting surface 1483 is opposite to and spaced from the limiting boss 147. When the vascular sheath 60 is installed, the first end surface 1245 of the vascular sheath 60 moves along the axial direction of the fixing ring 140 under the guiding action of the guide surface 1481, and when the end of the vascular sheath 60 is located between the limiting boss 147 and the limiting surface 1483, the guide protrusion 148 is embedded in the corresponding mounting hole 61, thereby realizing the connection between the vascular sheath 60 and the fixing ring 140.

[0107] In summary, the clamping mechanism 10 and the ventricular assist system 1 provided by the present invention make the inner diameter of the ring body 110 adjustable by setting a notch 114 on the ring body 110; by setting a limiting buckle ear 120 at the first end 118 of the ring body 110, and setting a movable buckle ear 1332 at one end of the connecting arm 133 of the locking assembly 130, the movable buckle ear 1332 is buckled with the limiting buckle ear 120, so that the connecting arm 133 is always connected with the limiting buckle ear 120 of the clamping ring 100. Compared with the traditional clamping mechanism which manually engages the connecting arm with the hook on the clamping ring and then rotates the handle to adjust the inner diameter of the ring body, the present application engages the movable buckle ear 1332 of the connecting arm 133 with the limiting buckle ear 120 of the clamping ring 100, so that the operator does not need to manually engage the connecting arm 133 with the hook on the clamping ring 100, but can directly drive the connecting arm 133 to move by rotating the handle 131, so that the movable buckle ear 1332 can move in the limiting buckle hole 126, thereby adjusting the inner diameter of the ring body 110, thereby improving the operating convenience of the clamping mechanism 10 and the ventricular assist system 1 and avoiding affecting the progress of the operation as much as possible.

[0108] The structure of the clamping mechanism 10 ′ of the second embodiment of the present invention is substantially the same as that of the clamping mechanism 10 of the first embodiment, except that the connection method between the enclosing plate 124 ′ and the ring body 110 ′ of the clamping mechanism 10 ′ of the second embodiment is different.

[0109] See also Fig.13 and Fig.14In this embodiment, the second connection end 1248' of the enclosure 124' is spaced a distance from the outer circumference 111' of the ring body 110', that is, the second connection end 1248' is not connected to the outer circumference 111' of the ring body 110', so as to prevent the movable buckle ear 1332' from driving the limit buckle ear 120 and the enclosure 124' to move when the locking assembly 130' is in the locked state, thereby preventing the ring body 110' from being deformed. In other embodiments, the second connection end 1248' may also be fixedly connected to the outer circumference 111' of the ring body 110'.

[0110] In this embodiment, the enclosure 124′ extends along an arc in the circumferential direction of the ring body 110′, and the first connection end 1241′ is spaced apart from the outer circumferential surface 111′ of the ring body 110′ by a first distance D1. At this time, the first distance D1 is not zero, and the end of the second connection end 1248′ is spaced apart from the outer circumferential surface 111′ of the ring body 110′ by a second distance D2. The second distance D2 is smaller than the first distance D1, so that there is a larger space at the abutment between the movable buckle ear 1332′ and the abutment column 122′, which is conducive to the movable buckle ear 1332′ to move in the limiting buckle hole 126′.

[0111] In the present embodiment, the second end face 1249′ of the enclosure 124′ is an arcuate face or an inclined face, so that the second end face 1249′ faces the ring body 110′, and the second end face 1249′ is spaced a distance from the outer surface of the ring body 110′, so as to prevent the movable buckle ear 1332′ from driving the limiting buckle ear 120′ and its enclosure 124′ to move when the locking assembly 130′ is in the locked state, thereby causing deformation of the ring body 110′.

[0112] In the present invention, the terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as specific or special structures. The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present invention and the features of different embodiments or examples without contradiction.

[0113] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A clamping mechanism, characterized in that: include: A clamping ring, the clamping ring comprising a ring body and a limiting buckle ear; the ring body is provided with a notch, the ring body has a first end and a second end opposite to each other, the first end and the second end are spaced apart to form the notch; the limiting buckle ear is provided at the first end, and the limiting buckle ear is provided with a limiting buckle hole; and A locking assembly, the locking assembly comprising a handle and a connecting arm, the handle being rotatably connected to the second end; one end of the connecting arm being rotatably connected to the handle, and the other end of the connecting arm being provided with a movable buckle ear, the movable buckle ear being buckled with the limit buckle ear and being able to move in the limit buckle hole; When the handle is rotated, it can drive the movable buckle ear of the connecting arm to move in the limiting buckle hole to adjust the distance between the first end and the second end, thereby adjusting the inner diameter of the ring body.

2. The clamping mechanism according to claim 1, characterized in that: The limiting buckle ear includes a contact column and a surrounding plate, the contact column is protruding from the ring body, the surrounding plate is connected to the contact column, and the surrounding plate, the contact column and the ring body jointly surround the limiting buckle hole; the movable buckle ear can be abutted against the contact column, and the handle can pull the contact column through the movable buckle ear to shorten the distance between the first end and the second end.

3. The clamping mechanism according to claim 2, characterized in that: The enclosure has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, and the abutment column is arranged on the outer circumference of the ring body, wherein: the second connection end is fixedly connected to the outer circumference of the ring body; or, the second connection end is separated from the outer circumference of the ring body by a distance.

4. The clamping mechanism according to claim 2, characterized in that: The abutment column is arranged on the outer circumferential surface of the ring body, and the enclosure plate extends along an arc in the circumferential direction of the ring body. The enclosure plate has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, the first connection end is spaced a first distance from the outer circumferential surface of the ring body, and the end of the second connection end is spaced a second distance from the outer circumferential surface of the ring body, and the second distance is smaller than the first distance.

5. The clamping mechanism according to claim 2, characterized in that: A step portion is provided at one end of the abutment column away from the ring body, and the step portion has a connected step bottom surface and a step side surface, and the step bottom surface faces away from the ring body. The enclosure has a first connecting end, and the first connecting end is connected to the abutment column. The first connecting end has a connected inner surface and a first end surface, and the inner surface abuts against the step bottom surface, and the first end surface abuts against the step side surface.

6. The clamping mechanism according to claim 5, characterized in that: The step portion also has a step top surface facing away from the ring body, the step top surface is connected to the step side surface, and the first connecting end also has an outer surface facing away from the inner surface, the outer surface is flush with the step top surface.

7. The clamping mechanism according to claim 2, characterized in that: The enclosure plate has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, and the second connection end has a second end surface, wherein: The second end face is an arcuate face and fits and is fixedly connected to the outer peripheral surface of the ring body; or, the second end face is an arcuate face or an inclined face so that the second end face faces the ring body and is spaced a distance from the outer surface of the ring body.

8. The clamping mechanism according to claim 2, characterized in that: The movable buckle ear is provided with a movable buckle hole for the limiting buckle ear to pass through, wherein: The axial length of the abutment column of the ring body is smaller than the axial width of the movable buckle hole of the ring body; and / or, the enclosure has a first connecting end, which is connected to the abutment column, and the axial length of the first connecting end of the ring body is equal to the axial length of the abutment column of the ring body.

9. The clamping mechanism according to claim 2, characterized in that: A radially thickened portion is provided on the outer circumferential surface of the first end of the ring body, and the radially thickened portion has a first surface facing away from the outer circumferential surface of the ring body, the abutment column is fixed to the first surface, and the projection of the abutment column along its length direction is located within the boundary of the first surface; the first surface has a first side edge away from the second end of the ring body, and the end face of the abutment column at one end fixed to the first surface has a second side edge, and the second side edge is located on the side of the abutment column away from the second end of the ring body, and the first side edge is spaced a distance from the second side edge.

10. The clamping mechanism according to claim 9, characterized in that: An arc-shaped or inclined transition step surface is formed between the outer peripheral surface of the ring body and a side of the first surface away from the second end.

11. The clamping mechanism according to claim 2, characterized in that: The enclosure has a first connection end and a second connection end away from the first connection end, the first connection end is connected to the abutment column, the enclosure has an arc-shaped guide surface, the guide surface extends from the second connection end to the first connection end, and the movable buckle ear can slide along the guide surface.

12. The clamping mechanism according to claim 1, characterized in that: The position-limiting buckle hole extends for a certain length along the circumference of the ring body, so that the movable buckle ear can also move along the circumference of the ring body in the position-limiting buckle hole.

13. The clamping mechanism according to claim 1, characterized in that: The limiting buckle hole is a through hole that penetrates the limiting buckle ear along the axial direction of the ring body, and the movable buckle ear is a buckle ring or a buckle hook that penetrates the through hole.

14. The clamping mechanism according to claim 1, characterized in that: The clamping mechanism also has at least one of the following features: The ring body is provided with a plurality of suture holes, and the plurality of suture holes are arranged between the first end and the second end along the circumference of the ring body; The handle is rotatably connected to the second end via a pin shaft, and the side surface of the second end is provided with an axial protrusion that can abut against the outlet tube of the ventricular assist device, and the axial protrusion is provided with an avoidance groove, which corresponds to the position of the pin shaft so that the pin shaft can be installed to the second end of the ring body from the avoidance groove.

15. The clamping mechanism according to claim 1, characterized in that: A pressing protrusion extending toward the second end is provided on the end surface of the first end, the pressing protrusion is arranged in the notch, and the pressing protrusion has a pressing surface close to the central axis of the ring body, and the pressing surface smoothly transitions with the inner circumference of the ring body.

16. A ventricular assist system, characterized in that: It comprises a ventricular assist device, an artificial blood vessel and a clamping mechanism as described in any one of claims 1 to 15, wherein the ventricular assist device is provided with an outlet tube, the artificial blood vessel is sleeved on the outlet tube, the ring body of the clamping mechanism is sleeved on the artificial blood vessel, and the locking assembly can lock the artificial blood vessel to the outlet tube.

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