Clamping mechanism and ventricular assistance system
By incorporating limiting and movable latches into the clamping mechanism, the operation steps are simplified, the inconvenience of traditional clamping mechanisms is resolved, and surgical efficiency is improved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SHENZHEN CORE MEDICAL TECH CO LTD
- Filing Date
- 2025-11-03
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional clamping mechanisms are inconvenient to operate and affect the progress of surgery.
A clamping mechanism was designed, which sets a limiting buckle on the outer periphery of the ring body and a movable buckle on the connecting arm of the locking component. The limiting buckle and the movable buckle are interlocked. By rotating the handle, the connecting arm is moved to adjust the inner diameter of the ring body, simplifying the operation steps.
It improves the ease of operation of the clamping mechanism, reduces the number of steps in the surgical procedure, and increases surgical efficiency.
Smart Images
Figure CN2025132130_15052026_PF_FP_ABST
Abstract
Description
Clamping mechanism and ventricular assist system
[0001] This application claims priority to Chinese patent application No. 202411566756.2, filed on November 5, 2024, with the Chinese Patent Office, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of medical device technology, and more specifically, to a clamping mechanism and a ventricular assist system. Background Technology
[0003] A ventricular assist device (VAD) is a device used to assist patients with severe ventricular insufficiency or heart failure by providing a certain blood flow and blood pressure. The VAD's outlet tube is connected to the aorta or pulmonary artery via an artificial blood vessel, and a clamping mechanism is used to secure the artificial blood vessel to the VAD's outlet tube.
[0004] However, traditional clamping mechanisms are not convenient to operate and need to be improved. Summary of the Invention
[0005] Based on this, this application provides a clamping mechanism and a ventricular assist system that can improve the ease of operation.
[0006] An embodiment of the first aspect of this application provides a clamping mechanism, the clamping mechanism comprising:
[0007] A clamping ring, comprising a ring body and a limiting lug; the ring body having a notch, having a first end and a second end opposite to each other, the first end and the second end being spaced apart to form the notch; the limiting lug being disposed at the first end, the limiting lug having a limiting hole; and
[0008] A locking assembly includes a handle and a connecting arm. The handle is rotatably connected to the second end. One end of the connecting arm is rotatably connected to the handle, and the other end is provided with a movable buckle. The movable buckle engages with the limiting buckle and can move within the limiting buckle hole.
[0009] When the handle is rotated, it can drive the movable buckle of the connecting arm to move in the limiting buckle hole, so as to adjust the distance between the first end and the second end, and thus adjust the inner diameter of the ring body.
[0010] An embodiment of the second aspect of this application provides a ventricular assist system, the ventricular assist system including a ventricular assist device, an artificial blood vessel and the aforementioned clamping mechanism, the ventricular assist device having an outlet tube, the artificial blood vessel being sleeved on the outlet tube, the ring of the clamping mechanism being sleeved on the artificial blood vessel, and the locking assembly being able to lock the artificial blood vessel to the outlet tube.
[0011] Details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 is a schematic diagram of the ventricular assist system provided by the present invention.
[0014] Figure 2 is an assembly diagram of the clamping mechanism and the artificial blood vessel provided by the present invention.
[0015] Figure 3 is a schematic diagram of the clamping mechanism provided in the first embodiment of the present invention.
[0016] Figure 4 is a structural schematic diagram of the clamping mechanism shown in Figure 3 from another perspective.
[0017] Figure 5 is a structural schematic diagram of the clamping mechanism shown in Figure 3 from another perspective.
[0018] Figure 6 is a magnified view of a portion of Figure 5 at point P1.
[0019] Figure 7 is a magnified view of a portion of Figure 5 at point P2.
[0020] Figure 8 is a partial exploded view of the clamping mechanism shown in Figure 3.
[0021] Figure 9 is a partial exploded view of the clamping mechanism (excluding the locking assembly) shown in Figure 3.
[0022] Figure 10 is a structural schematic diagram of the clamping mechanism shown in Figure 9 from another perspective.
[0023] Figure 11 is another exploded view of the clamping mechanism shown in Figure 3.
[0024] Figure 12 is an exploded view of the clamping mechanism and artificial blood vessel shown in Figure 2.
[0025] Figure 13 is a front view of the clamping mechanism shown in Figure 2 assembled with the artificial blood vessel.
[0026] Figure 14 is a cross-sectional view of Figure 13 along the AA direction.
[0027] Figure 15 is a schematic diagram of the clamping mechanism provided in the second embodiment of the present invention.
[0028] Figure 16 is a magnified view of a portion of Figure 15 at point P3. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0032] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.
[0033] The inventors of this application discovered that when operating existing clamping mechanisms during surgery, doctors need to first engage the connecting arm of the clamping mechanism with the hook on the clamping ring, and then lock the clamping ring by rotating the handle to fix the artificial blood vessel to the outlet tube of the ventricular assist device. That is, doctors need to manually engage the connecting arm with the hook before rotating the handle, which is not convenient to operate and indirectly affects the progress of the surgery.
[0034] Therefore, this application proposes a clamping mechanism and a ventricular assist system. By providing a limiting catch on the outer periphery of the ring body, and a movable catch on the connecting arm of the locking assembly, the limiting catch and the movable catch engage. This allows the operator to move the connecting arm directly by rotating the handle, without manually engaging the connecting arm with the hook on the clamping ring, so that the movable catch and the limiting catch abut against each other, thereby adjusting the inner diameter of the ring body. This improves the ease of operation of the clamping mechanism. The clamping mechanism and ventricular assist system provided in this application will be described in detail below with reference to specific embodiments and the accompanying drawings.
[0035] Please refer to Figures 1 and 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. The clamping mechanism 10 is sleeved on the artificial blood vessel 40 and can lock the artificial blood vessel 40 to the outlet tube 21.
[0036] 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.
[0037] The ventricular assist device 20 also includes a pump body 23, with an outlet pipe 21 connected to one side of the pump body 23. An impeller is provided inside the pump body 23, and the blood can be pumped to the outlet pipe 21 by rotating the impeller.
[0038] Referring to Figures 3 and 4, the 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 lug 120. The ring body 110 has a notch 114 and opposing first end 118 and second end 116, spaced apart to form the notch 114, allowing the inner diameter of the ring body 110 to be adjustable. The limiting lug 120 is located at the first end 118 and has a limiting hole 126. It is understood that when the inner diameter of the ring body 110 increases, the width of the notch 114 increases; conversely, when the inner diameter of the ring body 110 decreases, the width of the notch 114 decreases.
[0039] The ring 110 has an outer peripheral surface 111 and an inner peripheral surface 112 opposite to the outer peripheral surface 111. The inner peripheral surface 112 can abut against the artificial blood vessel 40, and the outer peripheral surface 111 can be used to set the limiting lug 120 and the locking component 130. In this embodiment, both the inner peripheral surface 112 and the outer peripheral surface 111 can be connected to the artificial blood vessel 40.
[0040] The locking assembly 130 can adjust the inner diameter of the ring 110. Specifically, the locking assembly 130 includes a handle 131 and a connecting arm 133. 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 latch 1332. The movable latch 1332 engages with the limiting latch 120 and can move within the limiting latch hole 126. When the handle 131 is rotated, it can drive the movable latch 1332 of the connecting arm 133 to move within the limiting latch hole 126, thereby adjusting the distance between the first end 118 and the second end 116, that is, adjusting the size of the notch 114, thereby adjusting the inner diameter of the ring 110.
[0041] In the illustrated embodiment, both the limiting lug 120 and the handle 131 are disposed on the outer peripheral surface 111 of the ring body 110. Since the outlet tube 21 of the ventricular assist device 20 and the artificial blood vessel 40 need to pass through the ring body 110, disposing of both the limiting lug 120 and the handle 131 on the outer peripheral surface 111 of the ring body 110 not only facilitates the operation of the clamping mechanism 10, but also ensures that when the first end 118 and the second end 116 of the ring body 110 are subjected to force, the width of the notch 114 in the axial direction of the ring body 110 is as equal as possible. If the limiting ear 120 and handle 131 are located on the side of the ring body 110, when the axial length of the ring body 110 is large, the side where the limiting ear 120 and handle 131 are located will be subjected to greater force, while the opposite side will be subjected to less force. This will result in the width of the notch 114 on the side with greater force being smaller, and the width of the notch 114 on the side with less force being larger. If the limiting ear 120 and handle 131 are located 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 ear 120 may also be provided on the end face of the ring body 110, such as the end face of the first end 118. In this case, the handle 131 may still be provided on the outer peripheral surface 111 of the ring body 110, or at other positions that facilitate cooperation with the limiting ear 120. In some embodiments, the limiting ear 120 may also be provided on the side of the ring body 110, and the handle 131 may also be provided 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 may be reduced, or a reinforcing structure may be provided at the first end 118 and the second end 116, etc.
[0042] In this embodiment, as shown in FIG3, the axial direction of the ring 110 refers to the extension direction of the central axis L of the ring 110; the radial direction of the ring 110 refers to the radius or diameter direction of the ring 110 and is perpendicular to the axial direction of the ring 110; the circumferential direction of the ring 110 refers to the circumferential direction of the ring 110.
[0043] 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.
[0044] The locking assembly 130 has an unlocked state and a locked state. When the locking assembly 130 switches from the locked state to the unlocked state, the inner diameter of the ring 110 increases due to its elastic deformation. When the locking assembly 130 is in the unlocked state, it releases the locking of the artificial blood vessel 40, allowing the artificial blood vessel 40 to be separated from the outlet tube 21. When the locking assembly 130 switches from the unlocked state to the locked state, the inner diameter of the ring 110 decreases. When the locking assembly 130 is in the locked state, it locks the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20. It should be noted that since the limiting latch 120 is engaged with the movable latch 1332, the movable latch 1332 of the connecting arm 133 is always connected to the limiting latch 120 of the ring 110, regardless of whether the locking assembly 130 is in the unlocked or locked state, and there is no situation where the movable latch 1332 disengages from the limiting latch 120.
[0045] Please refer to Figures 1, 3 to 5. The ring 110 is approximately circular and can be fitted around the outer periphery of the artificial blood vessel 40. The inner diameter of the ring 110 can be adjusted by the locking assembly 130. Specifically, reducing the inner diameter of the ring 110 can fix the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20; increasing the inner diameter of the ring 110 allows the artificial blood vessel 40 to be separated from the outlet tube 21 of the ventricular assist device 20.
[0046] The ring 110 has a notch 114 that penetrates the sidewall of the ring 110 and communicates with the inner hole of the ring 110, making the ring 110 an open structure, thus allowing the inner diameter of the ring 110 to be adjusted. The notch 114 on the ring 110 forms a first end 118 and a second end 116 opposite to each other. The first end 118 can be used to set a limiting lug 120, and the second end 116 can be used to set a handle 131. The first end 118 and the second end 116 can move closer to each other or further apart. When the first end 118 and the second end 116 are closer together, the inner diameter of the ring 110 decreases; when the first end 118 and the second end 116 are further apart, the inner diameter of the ring 110 increases. To increase the strength of the ring 110, the thickness of both the first end 118 and the second end 116 of the ring 110 is greater than the thickness of other parts of the ring 110.
[0047] The first end 118 has a pressing protrusion 1181 extending toward the second end 116 on its end face. The pressing protrusion 1181 is located at the notch 114. The pressing protrusion 1181 has a pressing surface 1184 close to the central axis L of the ring body 110. The pressing surface 1184 smoothly transitions with the inner circumferential surface 112 of the ring body 110, so that both the pressing surface 1184 and the inner circumferential surface 112 of the ring body 110 can abut against the artificial blood vessel 40 to compress the artificial blood vessel 40. This minimizes the possibility that the portion of the artificial blood vessel 40 corresponding to the notch 114 of the ring body 110 will not be compressed due to the notch 114, thereby achieving 360° compression of the artificial blood vessel 40 as much as possible and reducing the probability of blood leakage between the artificial blood vessel 40 and the outlet tube 21. Specifically, the pressing protrusion 1181 is located at the position corresponding to the notch 114.
[0048] In this embodiment, the second end 116 is provided with a relief groove 1161, the position of which corresponds to the position of the pressing protrusion 1181, and the relief groove 1161 can avoid the pressing protrusion 1181. Specifically, the position of the relief groove 1161 and the position of the pressing protrusion 1181 are correspondingly arranged in the circumferential direction of the ring body 100. Specifically, when the inner diameter of the ring body 110 decreases, the width of the notch 114 decreases, and the pressing protrusion 1181 can extend into the relief groove 1161, avoiding the pressing protrusion 1181 being blocked by the second end 116, thus preventing the inner diameter of the ring body 110 from decreasing. Simultaneously, as the distance between the first end 118 and the second end 116 of the ring 110 decreases, the pressing protrusion 1181 can partially extend into the recessed groove 1161, preventing a gap from forming between the end face of the pressing protrusion 1181 facing away from the first end 118 and the end face of the second end 116, thus 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 recessed groove 1161 and partially located outside the recessed groove 1161. The pressing protrusion 1181 can also be entirely outside the recessed groove 1161. If the pressing protrusion 1181 is entirely outside the recessed groove 1161, the end of the pressing protrusion 1181 furthest from the first end 118 should be as close as possible to the opening of the recessed groove 1161 in the circumferential direction of the ring 110. In some embodiments, the end of the pressing protrusion 1181 away from the first end 118 is flush with the groove of the relief groove 1161 in the circumferential direction of the ring 110.
[0049] Please refer to Figures 4 to 7. The limiting buckle 120 is provided on the outer peripheral surface 111 of the ring body 110. The limiting buckle 120 is engaged with the movable buckle 1332, so that the connecting arm 133 is always connected to the limiting buckle 120 of the clamping ring 100. Compared to traditional clamping mechanisms that require manually engaging the connecting arm with the hook on the clamping ring and then adjusting the inner diameter of the ring by turning the handle, this application connects the movable latch 1332 of the connecting arm 133 with the limiting latch 120 of the clamping ring 100. This eliminates the need for the operator to manually engage the connecting arm 133 with the hook on the clamping ring. The operator can simply turn the handle 131 to move the connecting arm 133, causing the movable latch 1332 of the connecting arm 133 to move within the limiting latch 120. This moves the first end 118 and the second end 116 of the ring 110 closer together, thereby adjusting the inner diameter of the ring 110. This improves the ease of operation of the clamping mechanism 10 and minimizes disruption to the surgical procedure.
[0050] The limiting buckle hole 126 is a through hole extending through the limiting buckle ear 120 along the axial direction of the ring body 110. The movable buckle ear 1332 is a buckle ring or hook that passes through the through hole (i.e., the limiting buckle hole 126) and is always engaged with the limiting buckle ear 120. In some embodiments, the limiting buckle hole 126 can also be a blind hole recessed into the limiting buckle ear 120 along the axial direction of the ring body 110, and the movable buckle ear 1332 is a hook inserted into the blind hole. For example, the blind hole formed by the limiting buckle hole 126 can be set as a guide rail. When the handle 131 is rotated, the hook formed by the movable buckle ear 1332 can move in the guide rail, which can also satisfy the requirement that the movable buckle ear 1332 is always engaged with the limiting buckle ear 120.
[0051] In this embodiment, the limiting buckle 120 includes an abutment post 122 and a surrounding plate 124, with the abutment post 122 protruding from the ring body 110. The surrounding plate 124, the abutment post 122, and the ring body 110 together form a limiting buckle hole 126. Exemplarily, the surrounding plate 124, the abutment post 122, and the outer peripheral surface 111 of the ring body 110 together form the limiting buckle hole 126. The movable buckle 1332 can abut against the abutment post 122. The handle 131 can pull the abutment post 122 through the movable buckle 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 1332 can abut against the inner side of the abutment post 122, wherein the inner side of the abutment post 122 refers to the portion of the abutment post 122 used to define the limiting buckle hole 126. In this embodiment, the enclosure 124, the abutment post 122, and the ring 110 can together form a closed limiting buckle hole 126 to prevent the movable buckle ear 1332 of the connecting arm 133 from separating from the limiting buckle ear 120.
[0052] In this embodiment, the abutment post 122 protrudes from the outer peripheral surface 111 of the ring body 110. Specifically, the abutment post 122 protrudes radially from the outer peripheral surface 111 of the ring body 110. In other embodiments, the abutment post 122 protrudes from the side surface of the ring body 110.
[0053] In this embodiment, the limiting buckle hole 126 is formed by the abutment post 122, the surrounding plate 124, and the ring body 110. In some embodiments, the limiting buckle ear 120 can also be a protrusion, which protrudes from the outer peripheral surface 111 of the ring body 110, and the limiting buckle hole 126 is a hole formed on the limiting buckle ear 120. In other embodiments, the limiting buckle ear 120 can also be an annular structure protruding from the outer peripheral surface 111 of the ring body 110, such as a circular annular structure.
[0054] Referring to Figures 8 to 10, in this embodiment, the abutment post 122 is generally rectangular. A stepped portion 1221 is provided at the end of the abutment post 122 away from the ring body 110, and the stepped portion 1221 is connected to one end of the surrounding plate 124. Specifically, the stepped portion 1221 is fixedly connected to one end of the surrounding plate 124. The stepped portion 1221 is located on the side of the abutment post 122 away from the handle 131. Specifically, the stepped portion 1221 has a connected stepped bottom surface 1223 and a stepped side surface 1225, with the stepped bottom surface 1223 facing away from the ring body 110.
[0055] The enclosure 124 is generally an arc-shaped plate structure. The enclosure 124 has a first connecting end 1241, which is connected to the abutment post 122. Specifically, the first connecting end 1241 is connected to the step portion 1221 of the abutment post 122. The first connecting end 1241 of the enclosure 124 has a connected inner surface 1243 and a first end face 1245. The inner surface 1243 faces the outer peripheral surface 111 of the ring body 110 and abuts against the bottom surface 1223 of the step. The inner surface 1243 of the first connecting end 1241 is also the inner surface of the enclosure 124, i.e., the surface of the enclosure 124 facing the ring body 110. The first end face 1245 abuts against the side face 1225 of the step, allowing the first connecting end 1241 of the enclosure 124 to fit into the step portion 1221. This also ensures a surface-to-surface contact between the enclosure 124 and the abutting post 122, increasing the contact area and thus enhancing the connection strength between the enclosure 124 and the abutting post 122. In this embodiment, the bottom surface 1223 of the step is approximately perpendicular to the side face 1225 of the step. In other embodiments, the included angle between the bottom surface 1223 of the step and the side face 1225 of the step can be an acute angle or an obtuse angle.
[0056] 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 face 1245. The outer surface 1247 is flush with the step top surface 1227. Specifically, the outer surface 1247 and the step top surface 1227 are flush with each other along the circumference of the ring body 110, so that the top of the limiting buckle 120 is relatively flat, minimizing the sharp edges caused by unevenness, thereby avoiding damage to the operator as much as possible.
[0057] In this embodiment, the first connecting end 1241 of the abutment post 122 and the surrounding plate 124 can be connected by welding. In other embodiments, the first connecting end 1241 of the abutment post 122 and the surrounding plate 124 can also be connected by other methods such as adhesive bonding, or fixedly connected by welding on the basis of adhesive bonding.
[0058] The enclosure 124 extends along an arc in the circumferential direction of the ring 110. A first connecting end 1241 is spaced a first distance from the outer peripheral surface 111 of the ring 110. The enclosure 124 also has a second connecting end 1248 located away from the first connecting end 1241. The end of the second connecting end 1248 is spaced a second distance from the outer peripheral surface 111 of the ring 110, the second distance being less than the first distance. In this embodiment, the second connecting end 1248 is fixedly connected to the outer peripheral surface 111 of the ring 110, i.e., the second distance is zero.
[0059] Specifically, the second connecting end 1248 has a second end face 1249, which is connected to the inner surface of the surrounding plate 124. In this embodiment, the second end face 1249 is an arc-shaped surface, and it is fitted and fixed to the outer peripheral surface 111 of the ring 110. Since the outer peripheral surface 111 of the ring 110 is also an arc-shaped surface, the fit of the two arc-shaped surfaces can maximize the contact area between them, thereby increasing the connection strength between the surrounding plate 124 and the ring 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 of the ring 110 can be fixedly connected by welding. In some embodiments, the second end face 1249 and the outer peripheral surface 111 of the ring 110 can also be connected by adhesive bonding. In other embodiments, the second connecting end 1248 of the surrounding plate 124 can also be inserted into the ring 110. The second connection terminal 1248 can also be connected to the ring body 110 in other ways. The specific connection method can be set according to the actual situation.
[0060] The enclosure 124 also 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 connecting end 1248 to the first connecting end 1241. That is, in the illustrated embodiment, the guide surface 1246 extends from one end of the connecting ring 110 of the enclosure 124 to the end of the enclosure 124 connected to the abutment post 122. The movable latch 1332 can slide along the guide surface 1246, making the movement of the movable latch 1332 in the limiting latch hole 126 smoother, so as to cooperate with the rotation of the handle 131, thereby further improving the ease of operation of the clamping mechanism 10. In addition, the guide surface 1246 of the enclosure 124 is set to be arc-shaped. Compared with the inclined surface, the width of the limiting latch hole 126 is larger, which is conducive to the rotation of the movable latch 1332 in the limiting latch hole 126. In other embodiments, the guide surface 1246 can also be configured as an inclined surface, which can guide the movable buckle 1332 to slide in the limiting buckle hole 126.
[0061] Please refer to Figures 5 to 7. The outer peripheral surface of the first end 118 of the ring body 110 is provided with a radially thickened portion 1182, which protrudes from the outer peripheral surface 111 of the ring body 110 in a direction away from the central axis L of the ring body 110. A pressing protrusion 1181 is provided on the end face of the radially thickened portion 1182 facing the second end 116. The radially thickened portion 1182 increases the thickness of the first end 118 along the radial direction of the ring body 110, thereby increasing the bending strength of the first end 118 and reducing the probability of the first end 118 deforming or bending under the action of external force.
[0062] The radially thickened portion 1182 has a first surface 1183 facing away from the outer peripheral surface 111 of the ring body 110. The abutment post 122 is fixed to the first surface 1183. The outer peripheral surface 111 of the ring body 110 includes a second surface 1112 corresponding to the limiting buckle hole 126, that is, the second surface 1112 is a portion of the hole wall of the limiting buckle hole 126.
[0063] Referring to Figures 8 to 10, the projection of the abutment post 122 along its length direction lies within the boundary of the first surface 1183, such that the projection of the abutment post 122 on the first surface 1183 does not exceed the boundary of the first surface 1183, and the cross-sectional area of the abutment post 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. The end face of the end of the abutment post 122 that is fixed to the first surface 1183 has a second side 1228, which is located on the side of the abutment post 122 away from the second end 116 of the ring body 110. The first side 1185 and the second side 1228 are spaced apart by a distance, such that in the circumferential direction of the ring body 110, there is at least a partial radial thickening 1182 between the abutment post 122 and the ring body 110. That is, the abutment post 122 and the ring body 110 are transitionally connected through at least a partial radial thickening 1182, rather than being directly fixed to each other. Furthermore, by spaced apart by a distance between the first side 1185 and the second side 1228, the stress at the connection between the abutment post 122 and the ring body 110 is dispersed when the inner diameter of the ring body 110 decreases, so as to avoid stress concentration at the connection between the abutment post 122 and the ring body 110, thereby reducing or avoiding the possibility of breakage at the joint between the abutment post 122 and the radial thickening 1182, and improving the service life of the clamping mechanism 10.
[0064] In this embodiment, an arc-shaped or inclined transition step 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 1113 is formed between the second surface 1112 and the first surface 1183. Specifically, from the side closer to the first surface 1183 to the side away from the first surface 1183, the distance from the transition step 1113 to the outer peripheral surface 111 of the ring body 110 gradually decreases. The transition step 1113 is set as an arc-shaped or inclined surface, so that when the handle 131 pulls the first end 118 closer to the second end 116, the transition step 1113 can further disperse the stress at the junction of the radially thickened portion 1182 and the ring body 110. In some embodiments, when the handle 131 pulls the first end 118 toward the second end 116, the movable latch 1332 can move sequentially along the second surface 1112, the transition step 1113, and the first surface 1183, so that the transition step 1113 can guide the movable latch 1332 to move in the limiting latch hole 126. The transition step 1113 is set as an arc surface or a slope, which makes the movement of the movable latch 1332 smoother, thereby further improving the ease of operation of the clamping mechanism 10.
[0065] The handle 131 is generally an arc-shaped plate structure, and it can be rotatably connected to the second end 116 of the clamping ring 100 via a pin 117. Specifically, when the handle 131 is opened, the end of the handle 131 facing away from the ring 110 moves away from the ring 110, causing the locking assembly 130 to switch from a locked state to an unlocked state. When the handle 131 is closed, the end of the handle 131 facing away from the ring 110 moves closer to the ring 110, causing the locking assembly 130 to switch from an unlocked state to a locked state.
[0066] In this embodiment, the bending degree of the handle 131 is the same as that of the ring 110, so that when the handle 131 is engaged, it can be as close as possible to the ring 110, reducing the overall size of the clamping mechanism 10 and minimizing contact between the clamping mechanism 10 and other organs inside the body. Furthermore, the fact that the bending degree of the handle 131 is the same as that of the ring 110 also prevents the handle 131 from opening too wide relative to the ring 110 in the locked state, thus avoiding accidental unlocking of the locking assembly 130 due to accidental contact with the handle 131. In other words, accidental unlocking of the locking assembly 130 by accidental contact with the handle 131 can be minimized.
[0067] An axial protrusion 1162 protrudes from the side of the second end 116 and abuts against the outlet pipe 21 of the ventricular assist device 20. The axial protrusion 1162 extends axially from the side of the second end 116 along the ring body 110. The axial protrusion 1162 abuts against the outlet pipe 21 of the ventricular assist device 20 along the circumference of the ring body 110, so that when the clamping mechanism 10 fixes the artificial blood vessel 40 to the outlet pipe 21, the clamping mechanism 10 can restrict the circumferential rotation of the clamping mechanism 10 along the ring body 110 through the abutment between the axial protrusion 1162 and the outlet pipe 21, which is beneficial to the fixation of the artificial blood vessel 40. Specifically, the axial protrusion 1162 is generally a rectangular plate structure.
[0068] Please refer to Figure 7. The axial convex plate 1162 has a relief groove 1163 on its surface opposite to the central axis L of the ring body 110. The relief groove 1163 corresponds to the position of the pin 117, thus avoiding the installation of the pin 117. This allows the pin 117 to be installed from the relief groove 1163 to the second end 116 of the ring body 110, reducing the assembly difficulty of the handle 131. The correspondence between the relief groove 1163 and the pin 117 means that the orthographic projection of the central axis of the pin 117 onto the axial convex plate 1162 is located on the bottom surface of the relief groove 1163. In other words, the relief groove 1163 and the pin 117 are not misaligned along the circumference of the ring body 110.
[0069] Referring to Figure 4, the handle 131 includes a rotating end 1312 and a free end 1314. The rotating end 1312 is rotatably connected to the ring body 110 via a pin 117. The free end 1314 is located at opposite ends of the rotating end 1312, facilitating the operator to rotate the handle 131. Specifically, the rotating end 1312 is rotatably connected to the second end 116. The end of the connecting arm 133 facing away from the ring body 110 is rotatably connected between the rotating end 1312 and the free end 1314.
[0070] To further facilitate the operator's rotation of the handle 131, a clearance groove 1315 is provided on the side of the free end 1314 near the outer peripheral surface 111 of the ring body 110. When the locking assembly 130 is in the locked state, the handle 131 is as close as possible to the ring body 110, that is, the free end 1314 of the handle 131 is closest to the ring body 110. Providing the clearance groove 1315 increases the distance from the surface of the free end 1314 facing the ring body 110 to the outer peripheral surface 111 of the ring body 110, making it easier for the operator to insert their fingers, thereby further facilitating the operator's rotation of the handle 131.
[0071] The connecting arm 133 is rotatably connected to the handle 131 via a pivot. Specifically, the connecting arm 133 is connected to the side of the handle 131 closest to the clamping ring 100. The connecting arm 133 is positioned corresponding to the notch 114. When the handle 131 moves the connecting arm 133, the movable latch 1332 of the connecting arm 133 abuts against the limiting latch 120. As the handle 131 continues to rotate, the connecting arm 133 moves the first end 118 toward the second end 116, thereby narrowing the width of the notch 114 and reducing the inner diameter of the ring 110, thus locking the artificial blood vessel 40 to the outlet tube 21 of the ventricular assist device 20.
[0072] The movable buckle 1332 is provided with a movable buckle hole 1334 for the limiting buckle 120 to pass through. The length of the abutment post 122 in the axial direction of the ring 110 is less than the width of the movable buckle hole 1334 in the axial direction of the ring 110, so that the movable buckle 1332 can move relative to the abutment post 122 under the drive of the handle 131, thereby making the rotation of the handle 131 smoother.
[0073] The wall of the movable buckle hole 1334 that abuts against the abutment post 122 is adapted to the cross-sectional shape of the abutment post 122. The surfaces of the abutment post 122 and the movable buckle ear 1332 that abut against each other are contoured surfaces. This allows the contact area between the abutment post 122 and the movable buckle ear 1332 to increase when the operator rotates the handle 131 to bring the limiting buckle ear 120 against the movable buckle ear 1332. This reduces the contact stress between the limiting buckle ear 120 and the movable buckle ear 1332 in the locked state of the locking assembly 130, thus reducing damage to the connecting arm 133 and the limiting buckle ear 120. Here, contoured surfaces refer to a pair of completely complementary surfaces that can fit precisely together, where the shape of one surface determines the shape of the other. For example, when the surface of the abutting post 122 that abuts against the movable buckle 1332 is a plane, the surface of the movable buckle 1332 that abuts against the abutting post 122 is also a plane; when the surface of the abutting post 122 that abuts against the movable buckle 1332 is a convex arc surface with a certain curvature, the surface of the movable buckle 1332 that abuts against the abutting post 122 is a concave arc surface with the same curvature.
[0074] In this embodiment, the length of the first connecting end 1241 in the axial direction of the ring body 110 is equal to the length of the abutment post 122 in the axial direction of the ring body 110. This can maximize the length of the abutment post 122 in the axial direction of the ring body 110, thereby increasing the area of the connection between the abutment post 122 and the first connecting end 1241 and improving the connection strength between the abutment post 122 and the ring body 110.
[0075] The limiting hole 126 extends a certain length along the circumference of the ring 110, allowing the movable ear 1332 to also move circumferentially within the limiting hole 126. That is, the movable ear 1332 can not only slide along the guide surface 1246 within the limiting hole 126, but also move circumferentially within the ring 110. This makes the movement of the movable ear 1332 more flexible, preventing the handle 131 connected to the connecting arm 133 from jamming during rotation, improving the smoothness of handle 131 rotation, and further enhancing the ease of operation of the clamping mechanism 10. The movable ear 1332's ability to rotate and move within the limiting hole 126 also allows it to contact the walls of each hole in the limiting hole 126.
[0076] In this embodiment, as the movable buckle 1332 moves circumferentially along the ring 110 within the limiting buckle hole 126, it sequentially contacts the second surface 1112, the transition step surface 1113, and the first surface 1183. Since the transition step surface 1113 is 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 1332 to move within the limiting buckle hole 126, making the movement of the movable buckle 1332 smoother.
[0077] The width of the movable buckle hole 1334 along the circumference of the ring 110 is greater than the width of the abutment post 122 along the circumference of the ring 110. This design allows the abutment post 122 to move within the movable buckle hole 1334, making the movement of the handle 131 and the connecting arm 133 smoother and reducing the difficulty of operating the clamping mechanism 10.
[0078] Please refer to Figures 10 to 14. The clamping ring 100 is provided with a suture hole 119. Specifically, the suture hole 119 is located in the ring body 110, and the artificial blood vessel 40 can be sutured to the clamping ring 100 through the suture hole 119. The suturing of the artificial blood vessel 40 to the clamping ring 100 can be completed before the operation, allowing the operator sufficient time to suture the artificial blood vessel 40 to the clamping ring 100. Then, by adjusting the locking component 130, the artificial blood vessel 40 can be fixed to the outlet tube 21. This avoids the cumbersome operation of binding the artificial blood vessel 40 to the outlet tube 21 with sutures during the operation, and also avoids the phenomenon of loose binding due to being busy or lacking skill during the operation. This improves the efficiency of assembling and disassembling the artificial blood vessel 40, as well as 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 hole 119 on the clamping ring 100, so that the artificial blood vessel 40 is fixedly connected to the clamping mechanism 10 without the need for an additional locking structure to fix the two together, thus simplifying the structure of the clamping mechanism 10.
[0079] The suture hole 119 penetrates the peripheral wall of the ring body 110. In this embodiment, the suture hole 119 penetrates the circumferential wall of the clamping ring 100 radially along 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 disposed on the inner peripheral surface 112 of the ring body 110, and the second opening 1192 is disposed on the outer peripheral 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 both be disposed on the inner peripheral surface 112 of the ring body 110, or both can be disposed on the outer peripheral surface 111 of the ring body 110, as long as the purpose of suturing the artificial blood vessel 40 to the clamping ring 100 through the suture hole 119 on the clamping ring 100 is satisfied.
[0080] In this embodiment, there are multiple suture holes 119, which are arranged circumferentially between the first end 118 and the second end 116 of the ring body 110. This allows the sutures passing through the suture holes 119 to be arranged circumferentially around the ring body 110, resulting in a more compact overall structure of the clamping mechanism 10. Specifically, the ring body 110 is provided with multiple suture holes 119. In this embodiment, all the suture holes 119 are arranged in a circle around the circumference of the ring body 110. In other embodiments, in addition to some suture holes 119 being arranged in a circle around the circumference of the ring body 110, some suture holes 119 may also be located at other positions on the clamping ring 100, as long as they allow the sutures to pass through.
[0081] In other embodiments, the clamping ring 100 may not have the suture hole 119, and the artificial blood vessel 40 may be connected to the clamping ring 100 by adhesive bonding. In another embodiment, the artificial blood vessel 40 may be connected to the clamping ring 100 by both adhesive bonding and suturing, depending on the actual situation.
[0082] Please refer to Figures 11 and 12. The clamping mechanism 10 also includes a retaining ring 140. The retaining ring 140 is arranged axially with the ring body 110 and is fixedly connected to the portion of the ring body 110 located between the first end 118 and the second end 116. The retaining 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 with the retaining ring 140. That is, the clamping ring 100 is located near the inner side of the outlet tube 21, and the retaining ring 140 is located near the opening of the outlet tube 21.
[0083] The clamping mechanism 10 also includes a sealing ring 160, which is disposed at the 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 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 out between the artificial blood vessel 40 and the outlet tube 21.
[0084] In this embodiment, the sealing ring 160 can be made of rubber. The rubber ring 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 deform under the compression state when the artificial blood vessel 40 and the fixing ring 140 are fitted together, providing a good sealing effect. In other embodiments, the sealing ring 160 can also be made of silicone or other materials with a certain degree of elasticity.
[0085] Referring to Figures 13 and 14, at least a portion of the inner wall of the sealing ring 160 can also be configured as a guide slope 161. The guide slope 161 has a guiding function, guiding the clamping mechanism 10 during its placement on the outlet pipe 21. This facilitates the installation of the clamping mechanism 10 onto the outlet pipe 21 and prevents the clamping mechanism 10 from failing to be smoothly placed on the outlet pipe 21 due to an abutting assembly state. The guide slope 161 formed on the inner wall of the sealing ring 160 also causes the sealing ring 160 to abut against the artificial blood vessel 40, reducing the probability of blood leakage between the artificial blood vessel 40 and the outlet pipe 21.
[0086] In this embodiment, along the direction from the ring body 110 to the fixing ring 140, the inner diameter of the sealing ring 160 near the end of the ring body 110 gradually decreases, so as to form the aforementioned guide slope 161 on the inner wall of the sealing ring 160. Specifically, when the clamping mechanism 10 is installed on the outlet pipe 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 pipe 21 also becomes smaller and smaller until the artificial blood vessel 40 abuts between the sealing ring 160 and the outlet pipe 21. In this way, the sealing performance of the assembly between the artificial blood vessel 40 and the fixing ring 140 can be improved, and blood can be prevented from leaking out between the artificial blood vessel 40 and the outlet pipe 21.
[0087] Please refer to Figures 11 and 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 fitted and assembled with the annular groove 143 of the fixing ring 140 through the annular protrusion 162, thereby making the fixing ring 140 and the sealing ring 160 stably fitted together. The number of annular grooves 143 and annular protrusions 162 is the same, and can be set to one or more.
[0088] The retaining ring 140 also has a mounting through hole 145, which is located on the bottom surface of the annular groove 143. The annular protrusion 162 has a mounting protrusion 164 on the side facing away from the inner surface 1243 of the sealing ring 160. The mounting protrusion 164 engages with the mounting through hole 145, ensuring a stable fit between the clamping ring 100 and the sealing ring 160. The number of mounting through holes 145 and mounting protrusions 164 is the same, and can be one or more. In other embodiments, the sealing ring 160 can also be integrally injection molded with the retaining ring 140; this is not limited here.
[0089] In this embodiment, the artificial blood vessel 40 includes a main tube segment 41 and a connecting tube segment 43. The connecting tube segment 43 is connected to one end of the main tube segment 41 and is disposed within the clamping ring 100. It is sutured to the clamping ring 100 through a suture hole 119 on the clamping ring 100. The connecting tube segment 43 can cover the first opening 1191 so that sutures can pass through the suture hole 119 and the connecting tube segment 43, thereby realizing the sutured connection between the artificial blood vessel 40 and the clamping mechanism 10.
[0090] In this embodiment, the artificial blood vessel 40 further includes a folded tube segment 45, which is connected to the end of the connecting tube segment 43 away from the main tube segment 41. 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 opposite to the connecting tube segment 43. That is, the folded tube segment 45 can cover the second opening 1192 of the suture hole 119. In this way, 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 to the clamping ring 100, thereby increasing the connection strength between the artificial blood vessel 40 and the clamping mechanism 10.
[0091] Please refer to Figure 1. The ventricular assist system 1 also includes a vascular sheath 60, which is connected to the fixing ring 140 and fitted around the periphery of the artificial blood vessel 40. The vascular sheath 60 can be made of a rigid material with a certain degree of hardness to protect the artificial blood vessel 40 and prevent it from being flattened, thus affecting blood flow. The vascular sheath 60 has multiple mounting holes 61, which are arranged circumferentially around the fixing ring 140, allowing the vascular sheath 60 to connect to the fixing ring 140.
[0092] The end of the fixing ring 140 near the clamping ring 100 is also provided with a limiting boss 147. The limiting boss 147 can be used to limit the vascular sheath 60 to restrict the vascular sheath 60 from moving axially along the fixing ring 140.
[0093] The end of the retaining ring 140 away from the clamping ring 100 is also provided with a guide protrusion 148, which is spaced apart from the limiting protrusion 147. The guide protrusion 148 can guide the vascular sheath 60 to guide the end of the vascular sheath 60 between the limiting protrusion 147 and the guide protrusion 148. In this embodiment, there are multiple guide protrusions 148, which are arranged circumferentially along the retaining ring 140, and each guide protrusion 148 can be inserted into a mounting hole 61.
[0094] The guide protrusion 148 includes a connected guide surface 1481 and a limiting surface 1483. The guide surface 1481 is an inclined surface that extends from the end of the fixing ring 140 in a direction away from the central axis of the fixing ring 140 to guide the vascular sheath 60. 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 is opposite to and spaced from the limiting boss 147. When the vascular sheath 60 is installed, the first end face 1245 of the vascular sheath 60 moves axially along the fixing ring 140 under the guidance of the guide surface 1481. 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 inserted into the corresponding mounting hole 61, thereby realizing the connection between the vascular sheath 60 and the fixing ring 140.
[0095] In summary, the clamping mechanism 10 and the ventricular assist system 1 provided by the present invention make the inner diameter of the ring 110 adjustable by providing a notch 114 in the ring 110; by providing a limiting buckle 120 at the first end 118 of the ring 110, and providing a movable buckle 1332 at one end of the connecting arm 133 of the locking assembly 130, the movable buckle 1332 is engaged with the limiting buckle 120, so that the connecting arm 133 is always connected to the limiting buckle 120 of the clamping ring 100. Compared to traditional clamping mechanisms that require manually engaging the connecting arm with the hook on the clamping ring and then rotating the handle to adjust the inner diameter of the ring, this application engages the movable latch 1332 of the connecting arm 133 with the limiting latch 120 of the clamping ring 100. This eliminates the need for the operator to manually engage the connecting arm 133 with the hook on the clamping ring 100. Instead, the operator can directly move the connecting arm 133 by rotating the handle 131, allowing the movable latch 1332 to move within the limiting latch hole 126, thereby adjusting the inner diameter of the ring 110. This improves the ease of operation of the clamping mechanism 10 and the ventricular assist system 1, minimizing disruption to the surgical procedure.
[0096] The clamping mechanism 10′ of the second embodiment of the present invention has a structure that is generally the same as that of the clamping mechanism 10 in the first embodiment. The difference is that the connection method between the surrounding plate 124′ and the ring body 110′ of the clamping mechanism 10′ in the second embodiment is different.
[0097] Please refer to Figures 13 and 14. In this embodiment, the second connecting end 1248' of the enclosure plate 124' is spaced apart from the outer peripheral surface 111' of the ring body 110'. That is, the second connecting end 1248' is not connected to the outer peripheral surface 111' of the ring body 110'. This prevents the locking assembly 130' from deforming the ring body 110' due to the movable buckle 1332' driving the limiting buckle 120 and its enclosure plate 124' to move when the locking assembly 130' is in the locked state.
[0098] In this embodiment, the surrounding plate 124′ extends along an arc in the circumferential direction of the ring 110′. The first connecting end 1241′ is spaced apart from the outer peripheral surface 111′ of the ring 110′ by a first distance D1. At this time, the first distance D1 is not zero. The end of the second connecting end 1248′ is spaced apart from the outer peripheral surface 111′ of the ring 110′ by a second distance D2. The second distance D2 is less than the first distance D1, so that there is a large space at the point where the movable buckle 1332′ abuts against the abutting post 122′, which is conducive to the movement of the movable buckle 1332′ in the limiting buckle hole 126′.
[0099] In this embodiment, the second end face 1249' of the enclosure 124' is an arc-shaped surface or a slope, the second end face 1249' faces the ring 110', and the second end face 1249' is spaced apart from the outer surface of the ring 110' by a certain distance.
[0100] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. A clamping mechanism, characterized in that, include: A clamping ring, comprising a ring body and a limiting lug; the ring body having a notch, having a first end and a second end opposite to each other, the first end and the second end being spaced apart to form the notch; the limiting lug being disposed at the first end, the limiting lug having a limiting hole; and A locking assembly includes a handle and a connecting arm. The handle is rotatably connected to the second end. One end of the connecting arm is rotatably connected to the handle, and the other end is provided with a movable buckle. The movable buckle engages with the limiting buckle and can move within the limiting buckle hole. When the handle is rotated, it can drive the movable buckle of the connecting arm to move in the limiting buckle hole, so as to adjust the distance between the first end and the second end, and thus adjust the inner diameter of the ring body.
2. The clamping mechanism according to claim 1, characterized in that, The limiting buckle includes an abutment post and a surrounding plate. The abutment post protrudes from the ring body, and the surrounding plate is connected to the abutment post. The surrounding plate, the abutment post, and the ring body together form the limiting buckle hole. The movable buckle can abut against the abutment post, and the handle can pull the abutment post through the movable buckle to reduce 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 connecting end and a second connecting end away from the first connecting end. The first connecting end is connected to the abutting post, and the abutting post protrudes from the outer peripheral surface of the ring body. The second connecting end is fixed to the outer peripheral surface of the ring body; or the second connecting end is spaced apart from the outer peripheral surface of the ring body by a certain distance.
4. The clamping mechanism according to claim 2, characterized in that, The abutting post protrudes from the outer circumferential surface of the ring body. The surrounding plate extends along an arc in the circumferential direction of the ring body. The surrounding plate has a first connecting end and a second connecting end away from the first connecting end. The first connecting end is connected to the abutting post. The first connecting end is spaced apart from the outer circumferential surface of the ring body by a first distance. The end of the second connecting end is spaced apart from the outer circumferential surface of the ring body by a second distance. The second distance is less than the first distance.
5. The clamping mechanism according to claim 2, characterized in that, The abutment post has a stepped portion at the end away from the ring body. The stepped portion has a connected bottom surface and a connected side surface. The bottom surface of the step is away from the ring body. The enclosure plate has a first connecting end, which is connected to the abutment post. The first connecting end has a connected inner surface and a first end face. The inner surface abuts against the bottom surface of the step, and the first end face abuts against the side surface of the step.
6. The clamping mechanism according to claim 5, characterized in that, The step portion also has a step top surface that is opposite to the ring body, the step top surface is connected to the step side surface, and the first connecting end also has an outer surface that is opposite to the inner surface, the outer surface being flush with the step top surface.
7. The clamping mechanism according to claim 2, characterized in that, The enclosure panel has a first connecting end and a second connecting end away from the first connecting end, the first connecting end being connected to the abutment post, and the second connecting end having a second end face, wherein: The second end face is an arc-shaped surface and is fitted and fixed to the outer peripheral surface of the ring body; or, the second end face is an arc-shaped surface or an inclined surface, the second end face faces the ring body, and the second end face is spaced apart from the outer surface of the ring body by a certain distance.
8. The clamping mechanism according to claim 2, characterized in that, The movable buckle lug is provided with a movable buckle hole for the limiting buckle lug to pass through, wherein: The length of the abutment post in the axial direction of the ring body is less than the width of the movable buckle hole in the axial direction of the ring body; and / or, the enclosure has a first connecting end, the first connecting end being connected to the abutment post, and the length of the first connecting end in the axial direction of the ring body is equal to the length of the abutment post in the axial direction of the ring body.
9. The clamping mechanism according to claim 2, characterized in that, The outer circumferential surface of the first end of the ring body is provided with a radially thickened portion, the radially thickened portion having a first surface facing away from the outer circumferential surface of the ring body, the abutment post being fixed to the first surface, and the projection of the abutment post along its length direction being located within the boundary of the first surface; the first surface having a first side away from the second end of the ring body, the end face of the abutment post fixed to the first surface having a second side, the second side being located on the side of the abutment post away from the second end of the ring body, and the first side and the second side being spaced apart by a distance.
10. The clamping mechanism according to claim 9, characterized in that, An arc-shaped or inclined transition step is formed between the outer peripheral surface of the ring and the side of the first surface away from the second end. The distance between the transition step and the outer peripheral surface of the ring gradually decreases from the side closer to the first surface to the side away from the first surface.
11. The clamping mechanism according to claim 2, characterized in that, 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 post. The enclosure has an arc-shaped guide surface that extends from the second connecting end to the first connecting end. The movable buckle can slide along the guide surface.
12. The clamping mechanism according to claim 2, characterized in that, The surface of the abutting post that abuts against the movable buckle and the surface of the movable buckle that abuts against the abutting post are similar to each other.
13. 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, and the width of the movable buckle hole along the circumference of the ring body is greater than the width of the abutment post along the circumference of the ring body.
14. The clamping mechanism according to claim 1, characterized in that, The 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 within the limiting buckle hole.
15. The clamping mechanism according to claim 1, characterized in that, The limiting buckle hole is a through hole that passes through the limiting buckle ear along the axial direction of the ring body, and the movable buckle ear is a buckle ring or buckle hook that passes through the through hole.
16. The clamping mechanism according to claim 1, characterized in that, Both the limiting buckle and the handle are located on the outer circumferential surface of the ring.
17. A ventricular assist system, characterized in that, The device includes a ventricular assist device, an artificial blood vessel, and a clamping mechanism as described in any one of claims 1-16, wherein the ventricular assist device has an outlet tube, the artificial blood vessel is sleeved on the outlet tube, the ring of the clamping mechanism is sleeved on the artificial blood vessel, and the locking assembly is capable of locking the artificial blood vessel to the outlet tube.