Prosthesis conveying apparatus and prosthesis system

Abstract

A prosthesis conveying apparatus and a prosthesis system. The prosthesis conveying apparatus (1) comprises a handle shell (11), a control wire (12), a moving shaft (13), and a driving handle (14); the distal end of the control wire (12) is used for being connected to a prosthesis; the moving shaft (13) is movably accommodated in the handle shell (11) and is used for driving the control wire to move, so as to drive the state of the prosthesis to be changed; the driving handle (14) can rotate relative to the handle shell so as to drive the moving shaft to move to transmit external torque to the prosthesis; the driving handle (14) comprises an overload protection component (141); the overload protection component is used for transmitting torque, which does not exceed a threshold, to the moving shaft and preventing torque exceeding the threshold from being transmitted to the moving shaft. By means of the overload protection component, the prosthesis conveying apparatus solves the problems that the control wire is broken, the prosthesis fails and is damaged, or a human tissue is injured, etc., as a result of a too large force being applied when the driving handle operates the prosthesis at a distal end, thereby improving the reliability of the prosthesis system and the operation safety.

Description

Prosthesis delivery device and prosthesis system

[0001] Cross-references

[0002] This application is based on the Chinese patent applications with application numbers "202311110606.6" and "202322359283.6" and application date of August 30, 2023, and claims the priority of the above-mentioned Chinese patent applications. The entire contents of the above-mentioned Chinese patent applications are hereby incorporated into this application by introduction. Technical Field

[0003] The present application belongs to the field of medical device technology, and more specifically, relates to a prosthesis delivery device and a prosthesis system. Background Art

[0004] Minimally invasive treatment methods are popular with patients due to their advantages, such as small incisions, minimal harm to patients, and rapid postoperative recovery. Prosthesis implantation is a key component of minimally invasive treatment methods. Generally speaking, a prosthetic system includes a delivery device and an implanted prosthesis located at the distal end of the delivery device. During the procedure, the operator manipulates the delivery device to deliver the implanted prosthesis to the target location through natural body cavities such as veins or other delivery pathways. Once the implanted prosthesis is released, the delivery device is separated from the implanted prosthesis and then withdrawn to complete the interventional procedure.

[0005] U.S. Patent No. 10076327B2 discloses a device, system, and method for tissue approximation and treatment site repair. The patented technology has numerous problems. For example, when the implanted prosthesis (such as a mitral valve clip) of the device is in a locked state, unexpected rotation of the handle threaded rotor may cause the implanted prosthesis to be subjected to unexpected forces, which may easily lead to failure of the implanted prosthesis' locked state. For another example, when the lock is released, the implanted prosthesis may be damaged or popped open due to the sudden release of the force. For another example, during surgery, the rotating handle threaded rotor may exert excessive force on the control wire (and the implanted prosthesis). Excessive force / torque may cause the control wire to break, or the implanted prosthesis to fail or be damaged, and may also cause damage to human tissue.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a prosthesis delivery device and a prosthesis system to solve one or more of the above-mentioned technical problems.

[0008] To achieve the above-mentioned objectives, the technical solution adopted in the present application is: In the first aspect, the present application provides a prosthesis delivery device, comprising: a handle shell; a control wire, the distal end of which is used to connect to the prosthesis; a movable shaft, movably accommodated in the handle shell, for driving the prosthesis to change state by driving the control wire to move; a driving handle, which can be rotated relative to the handle shell to drive the movable shaft to move and transmit external torque to the prosthesis, and the driving handle includes an overload protection component, which is configured to transmit a torque that does not exceed a threshold to the movable shaft, and prevent torque above the threshold from being transmitted to the movable shaft.

[0009] In one embodiment, the driving handle further includes a transmission member, the transmission member is threadedly engaged with the movable shaft to drive the movable shaft to move, and the overload protection component is sleeved on the outside of the transmission member.

[0010] In one embodiment, the overload protection assembly includes a support member, a passive member, and an active member, wherein the passive member is configured to be circumferentially stationary relative to the transmission member and to be axially movable relative to the transmission member; the active member is configured to be axially stationary relative to the transmission member and to be circumferentially rotatable relative to the transmission member; the support member is used to maintain axial contact between the passive member and the active member;

[0011] The passive component includes a first abutting surface, and the active component includes a second abutting surface. The first abutting surface and the second abutting surface are arranged correspondingly. The first abutting surface and the second abutting surface are planes at least in the abutting portion, and the planes are not parallel to the axis of the driving handle.

[0012] In one embodiment, both the first abutting surface and the second abutting surface are planes perpendicular to the axis of the driving handle.

[0013] In one embodiment, the first abutting surface includes a first vertical surface, a first horizontal surface and a first inclined surface connected in sequence; the second abutting surface includes a second vertical surface, a second horizontal surface and a second inclined surface connected in sequence; the first vertical surface and the second vertical surface are both planes parallel to the axis of the driving handle, the first horizontal surface and the second horizontal surface are both planes perpendicular to the axis of the driving handle, the first inclined surface and the second inclined surface are both planes arranged at an angle to the axis of the driving handle, and the arrangement angle of the first inclined surface is the same as the arrangement angle of the second inclined surface.

[0014] In one embodiment, the first abutting surface includes a third inclined surface and a fifth inclined surface connected to the third inclined surface, and the third inclined surface and the fifth inclined surface are set at an obtuse angle; the second abutting surface includes a fourth inclined surface and a sixth inclined surface connected to the fourth inclined surface, and the fourth inclined surface and the sixth inclined surface are set at an obtuse angle; the third inclined surface and the fourth inclined surface are both planes arranged at an angle to the axis of the driving handle, and the arrangement angle of the third inclined surface is the same as the arrangement angle of the fourth inclined surface; the fifth inclined surface and the sixth inclined surface are both planes arranged at an angle to the axis of the driving handle, and the arrangement angle of the fifth inclined surface is the same as the arrangement angle of the sixth inclined surface.

[0015] In one embodiment, the overload protection assembly includes a support member, a passive member, and an active member, wherein the passive member is configured to be circumferentially stationary relative to the transmission member and to be axially movable relative to the transmission member; the active member is configured to be axially stationary relative to the transmission member and to be circumferentially rotatable relative to the transmission member; the support member is used to maintain axial contact between the passive member and the active member;

[0016] The passive part includes a first abutting surface, and the active part includes a second abutting surface. The first abutting surface and the second abutting surface are arranged correspondingly. At least one of the first abutting surface and the second abutting surface is a curved surface at the abutting position, and the first abutting surface and the second abutting surface are circumscribed at the abutting position, and the circumscribed surface is not parallel to the axis of the driving handle.

[0017] In one embodiment, the passive component includes a first body and a first abutting portion, the first body is located at the distal end of the first abutting portion, and the first abutting surface is provided on the proximal end surface of the first abutting portion;

[0018] The active member includes a second body and a second abutting portion, the second body is located at the proximal end of the second abutting portion, and the second abutting surface is provided at the distal end surface of the second abutting portion.

[0019] In one embodiment, a radial dimension of the first abutting portion is greater than a radial dimension of the first body, and a first blocking shoulder is formed at a connection between the first abutting portion and the first body, and the first blocking shoulder is used to abut against the support member.

[0020] In one embodiment, the overload protection assembly also includes a accommodating seat, which is fixedly sleeved on the outside of the transmission member, and the support member, the active member and the passive member are coaxially sleeved on the outer surface of the accommodating seat; the accommodating seat includes a distal part, a middle part and a proximal part; the radial dimension of the distal part is larger than the radial dimension of the middle part, forming a distal shoulder, the radial dimension of the middle part is larger than the radial dimension of the proximal part, forming a proximal shoulder, the distal shoulder is used to support the support member, and the proximal shoulder is used to abut the passive member to limit and prevent the passive member from moving too much toward the distal part.

[0021] In one embodiment, the support member is a compression spring, one end of the compression spring abuts against the distal shoulder, and the other end of the compression spring abuts against the first blocking shoulder.

[0022] In one embodiment, a first anti-rotation groove is provided on the first body of the passive component, and a first anti-rotation pin is provided on the outer surface of the proximal portion, and the first anti-rotation pin is axially movably accommodated in the first anti-rotation groove.

[0023] In one embodiment, the overload protection assembly further includes a transmission housing coaxially sleeved on the outside of the active member to receive external torque and transmit it to the active member, and the active member is configured to remain circumferentially stationary relative to the transmission housing.

[0024] In one embodiment, a second anti-rotation groove is provided on the second body of the active member, and a second anti-rotation pin is provided on the inner wall of the transmission housing. The second anti-rotation pin is axially movably accommodated in the second anti-rotation groove.

[0025] In one embodiment, the outer surface of the transmission housing is provided with an anti-slip structure.

[0026] In one embodiment, the overload protection assembly further includes a accommodating cover, the distal end of the accommodating cover having an axially extending coupling portion, the proximal end of the accommodating cover having a circumferentially extending blocking portion, the coupling portion being coupled to the proximal end of the accommodating seat to detachably fix the accommodating cover to the accommodating seat, and the blocking portion being used to keep the active member axially stationary relative to the transmission member.

[0027] In one embodiment, the handle shell includes an inner cavity, the proximal end of the handle shell is provided with an opening, the distal end of the transmission member enters the inner cavity of the handle shell through the opening, and the transmission member is configured to only rotate relative to the handle shell.

[0028] In one embodiment, the transmission member has a limiting protrusion located at the distal end and a limiting ridge located proximal to the limiting protrusion. The limiting protrusion is circumferentially arranged on the transmission member and is provided inside the handle shell. The limiting ridge is circumferentially arranged on the transmission member and is provided outside the handle shell. An opening groove is formed between the limiting protrusion and the limiting ridge; the opening is retracted to form an opening shoulder, and the opening shoulder is accommodated in the opening groove.

[0029] In one embodiment, the radial dimension of the limiting ridge is greater than the radial dimension of the limiting protrusion.

[0030] A second aspect of the present application provides a prosthesis system, comprising the prosthesis delivery device and a prosthesis as described above.

[0031] The prosthesis delivery device provided in an embodiment of the present application includes a handle housing, a control wire, a movable shaft and a drive handle. The distal end of the control wire is used to connect to the prosthesis. The movable shaft is movably accommodated in the handle housing and is used to drive the prosthesis to change its state by driving the control wire to move. The drive handle can rotate relative to the handle housing to drive the movable shaft to move and transmit external torque to the prosthesis. The drive handle includes an overload protection component, which is used to transmit torque that does not exceed a threshold to the movable shaft and prevent torque above the threshold from being transmitted to the movable shaft. The prosthesis delivery device solves the problem of excessive force that is easily caused when the drive handle operates the distal prosthesis through the overload protection component. Excessive force / torque can cause the control wire to break, the prosthesis to fail or be damaged, and may also cause damage to human tissue. The prosthesis delivery device provided in an embodiment of the present application improves the reliability of the prosthesis system and the safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a schematic diagram of the partial structure of the proximal end of a prosthesis delivery device provided by one embodiment of the present application;

[0034] FIG2 is a cross-sectional view of the structure of a driving handle in a prosthesis delivery device provided in one embodiment of the present application;

[0035] FIG3 is a schematic diagram of the cooperation between the passive component and the active component in the prosthesis delivery device provided by one embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of a passive component in a prosthesis delivery device provided in one embodiment of the present application;

[0037] FIG5 is a schematic diagram of the assembly of active and passive components of a prosthesis delivery device provided in one embodiment of the present application;

[0038] FIG6 is a schematic structural diagram of the assembled passive component, active component, and receiving seat of the prosthesis delivery device provided by one embodiment of the present application;

[0039] FIG7 is a schematic structural diagram of an overload protection assembly of a prosthesis delivery device provided in one embodiment of the present application;

[0040] FIG8 is a schematic diagram of the torque transmission principle of a prosthesis delivery device provided by one embodiment of the present application;

[0041] FIG9 is a schematic structural diagram of a mitral valve clip provided in one embodiment of the present application;

[0042] FIG10 is a schematic structural diagram of a mitral valve clip provided by one embodiment of the present application when the clip arms are closed;

[0043] FIG11 is a schematic structural diagram of the mitral valve clip provided by one embodiment of the present application when the clip arms are deployed. DETAILED DESCRIPTION

[0044] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0045] In the description of this application, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatuses.

[0046] In addition, in this application, unless otherwise clearly stipulated and limited, the terms "connect", "connected", "fixed", "installed", etc. should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection between two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0047] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more.

[0049] An embodiment of the present application provides a prosthesis delivery device including a handle housing, a control wire, a movable shaft and a driving handle; the distal end of the control wire is used to connect to the prosthesis; the movable shaft is movably accommodated in the handle housing, and is used to drive the prosthesis to change its state by driving the control wire to move; the driving handle is rotatable relative to the handle housing to drive the movable shaft to move and transmit external torque to the prosthesis, and the driving handle includes an overload protection component, which is configured to transmit a torque that does not exceed a threshold to the movable shaft, and prevent torque above the threshold from being transmitted to the movable shaft.

[0050] The prosthesis delivery device in this embodiment solves the problem of excessive force applied by the driving handle to operate the distal prosthesis, which may cause the control wire to break, the prosthesis to fail or be damaged, or cause harm to human tissue, through an overload protection component, thereby improving the reliability of the prosthesis system and the safety of operation.

[0051] Yet another embodiment of the present application provides a prosthesis system comprising the above-mentioned prosthesis delivery device and a prosthesis.

[0052] In the following embodiments, the prosthesis delivery device and prosthesis system provided by this application will be described in detail using a mitral valve clip for treating mitral regurgitation as an example. The fact that the prosthesis is a mitral valve clip for treating mitral regurgitation does not limit the scope of protection of this application. For example, the prosthesis may also be a tricuspid valve clip, an abdominal aortic stent, a thoracic aortic stent, a left atrial appendage occluder, or an intracranial coil.

[0053] In each embodiment of the present application, the term "distal end" is defined as the end away from the operator during the surgical operation, and the term "proximal end" is defined as the end close to the operator during the surgical operation. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those generally understood by technicians in the technical field of this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "radial dimension" does not mean that the component, part or part must be a solid of revolution or a sphere; for components, parts or parts under a solid of revolution or a sphere, "radial" refers to the perpendicular direction from the edge to the axis.

[0054] FIG1 is a schematic diagram of the partial structure of the proximal end of a prosthesis delivery device provided in an embodiment of the present application, FIG2 is a schematic diagram of the structure of a driving handle in a prosthesis delivery device provided in an embodiment of the present application, FIG9 is a schematic diagram of the structure of a mitral valve clip provided in an embodiment of the present application, FIG10 is a schematic diagram of the structure of a mitral valve clip provided in an embodiment of the present application when the clamp arm is closed, and FIG11 is a schematic diagram of the structure of a mitral valve clip provided in an embodiment of the present application when the clamp arm is expanded. Referring to FIG1, FIG2, and FIG9, the prosthesis system provided in this embodiment includes a prosthesis delivery device 1 and a prosthesis 2. In this embodiment, the prosthesis 2 is a mitral valve clip.

[0055] Please refer to Figures 1 and 2. The delivery device 1 provided in this embodiment includes a handle shell 11, a control wire 12, a movable shaft 13 and a driving handle 14. The distal end of the control wire 12 is used to connect with the prosthesis. The movable shaft 13 is movably accommodated in the handle shell 11 and is used to drive the prosthesis to change its state by driving the control wire 12 to move. The driving handle 14 can be rotated relative to the handle shell 11 to drive the movable shaft 13 to move and transmit external torque to the prosthesis. The driving handle 14 includes an overload protection component 141. The overload protection component 141 is configured to transmit a torque that does not exceed a threshold to the movable shaft 13, and prevent torque above the threshold from being transmitted to the movable shaft 13.

[0056] Here, the state change of the prosthesis may refer to a change in the shape, size, or posture of the prosthesis as a whole, for example, the stent changes from a compressed state to a released state. Exemplarily, a binding wire is provided on the abdominal aortic stent and the thoracic aortic stent, and the binding wire binds the abdominal aortic stent and the thoracic aortic stent to maintain the abdominal aortic stent and the thoracic aortic stent in a compressed state. When the abdominal aortic stent and the thoracic aortic stent are implanted in the target position, the control wire 12 pulls the binding wire away from the abdominal aortic stent and the thoracic aortic stent to put the abdominal aortic stent and the thoracic aortic stent into a released state. The state change of the prosthesis may refer to a change in the connection relationship between the prosthesis and the delivery device or the target tissue, for example, from a connected state to a separated state. Exemplarily, when delivering a left atrial appendage occluder or intracranial coil, the control wire 12 is connected to the device or coil. After the device or coil is released, the control wire 12 is driven to separate from the device or coil, placing the device or coil in a released state. A change in the state of the prosthesis can also involve a change in the shape or size of some components, parts, or parts within the prosthesis, or a change in their position relative to the rest of the device. For example, referring to Figures 9-11, in this embodiment, the mitral valve clip arms 22 are driven to swing by axial movement of the control wire 12. "Position" includes position and / or posture.

[0057] When the delivery device of this embodiment is used in a surgical procedure to treat mitral valve regurgitation, the prosthetic delivery device 1 transmits a torque that does not exceed a threshold value to the movable shaft 13 through the overload protection component 141, and prevents torque above the threshold value from being transmitted to the movable shaft 13, thereby solving the problem of excessive force that is easily caused when the driving handle 14 opens or closes the distal mitral valve clip. When excessive force / torque is transmitted to the distal mitral valve clip, it may cause the control wire 12 to break, or cause the angle of expansion or closing of the clamping arm 22 in the mitral valve clip to exceed the physical limit, thereby damaging or failing the mitral valve clip. At the same time, the mitral valve clip may break the edges of the anterior and posterior lobes of the mitral valve, causing damage to the mitral valve leaflets.

[0058] Referring to Figures 9-11 , the prosthesis 2 (in this embodiment, a mitral valve clip) comprises a central base 21, distally located clamping arms 22, and a proximally located clamping member 23. The clamping arms 22 and the clamping member 23 define a clamping space for accommodating the mitral valve leaflets 3. The clamping arms 22 and the clamping member 23 can each open and close (i.e., change positions) around the axis of the central base 21 to alter the clamping space and thereby clamp or release the mitral valve leaflets 3 (i.e., the anterior and posterior leaflets). For example, the clamping arm 22 rotates distally and the clamping member 23 rotates proximally, and the clamping arm 22 and the clamping member 23 open to expand the clamping space, facilitating the entry of the mitral valve leaflets 3 into the clamping space. Then, the clamping arm 22 rotates proximally and the clamping member 23 rotates distally, and the clamping arm 22 and the clamping member 23 close to narrow the clamping space. Finally, the clamping arm 22 and the clamping member 23 are brought into close contact, thereby clamping the mitral valve leaflets 3. The clamping arm 22 of the mitral valve clip of this embodiment includes a first clamping arm 221 and a second clamping arm 222, which are symmetrically arranged about the axis of the central base 21. Accordingly, the clamping member 23 of the mitral valve scaffold in this embodiment includes a first clamping member 231 and a second clamping member 232. The first clamping member 231 is used to cooperate with the first clamping arm 221 to clamp one mitral valve leaflet 3, and the second clamping member 232 is used to cooperate with the second clamping arm 222 to clamp the other mitral valve leaflet 3. In this embodiment, the central base 21 is detachably connected to the distal end of the delivery device. This embodiment does not limit the specific implementation of this detachable connection.

[0059] The prosthesis 2 further includes an actuating assembly 24 for driving the clamping arms 22 to open and close about the central base 21 under the drive of the control wire 12, so that the clamping arms 22 can clamp or release the leaflets 3 of the mitral valve in cooperation with the clamping member 23. Specifically, the actuating assembly 24 of this embodiment includes a first connecting rod 241, a second connecting rod 242, and a base 243. The first connecting rod 241 has one end rotatably connected to the first clamping arm 221 and the other end rotatably connected to the base 243; the second connecting rod 242 has one end rotatably connected to the second clamping arm 222 and the other end rotatably connected to the base 243. The base 243 includes a horizontal portion and a vertical portion. The ends of the horizontal portion are respectively connected to the first connecting rod 241 and the second connecting rod 242. The vertical portion is accommodated in the hollow central base 21 and can move relative to the central base 21. Specifically, the base 243 of this embodiment is T-shaped. The ends of the horizontal portion of the base 243 are connected to the first connecting rod 241 and the second connecting rod 242, respectively. The vertical portion is housed in the central base 21 and is movable relative to the central base 21. For example, the first connecting rod 241, the second connecting rod 242, the first clamping arm 221, the second clamping arm 222, the base 243, and the central base 21 are pin-connected to form a connecting rod structure. The vertical portion is detachably connected to the control wire 12. Under the force of the control wire 12, the base 243 moves relative to the central base 21, thereby causing the first clamping arm 221 and the second clamping arm 222 to rotate to clamp the edges of the mitral valve leaflets 3. In this embodiment, when the base 243 moves proximally relative to the central base 21 under the force of the control wire 12, the first clamping arm 221 and the second clamping arm 222 rotate proximally to clamp the edges of the mitral valve leaflets 3.

[0060] For example, the distal end of the control wire 12 has an external thread, and correspondingly, the vertical portion has a matching internal thread, and the external and internal threads cooperate to achieve a detachable connection between the control wire 12 and the vertical portion of the base 243. Of course, in other alternative embodiments, the distal end of the control wire 12 can be provided with an internal thread, and the vertical portion of the base 243 can be provided with a matching external thread.

[0061] Continuing to refer to Figures 1 and 2, in this embodiment, the movable shaft 13 is configured to move only axially relative to the handle housing 11, and the driving handle 14 is configured to move only rotationally relative to the handle housing 11. The axial movement of the movable shaft 13 is driven by the rotational movement of the driving handle 14. Exemplarily, the handle housing 11 includes an inner cavity, and the proximal end of the handle housing 11 is provided with an opening that is inwardly recessed to form an open shoulder 111. The driving handle 14 includes a hollow transmission member 142, and the distal end of the transmission member 142 is provided with a circumferentially extending open groove 1423. The open shoulder 111 is accommodated within the open groove 1423, so that the driving handle 14 is restricted to rotation relative to the handle housing 11. In one example, the transmission member 142 has a limiting protrusion 1421 at its distal end. The limiting protrusion 1421 is circumferentially arranged on the transmission member 142 and disposed inside the handle housing 11. Proximal to the limiting protrusion 1421, the transmission member 142 has a limiting ridge 1422. The limiting ridge 1422 is circumferentially arranged on the transmission member 142 and disposed outside the handle housing 11. Thus, the aforementioned opening groove 1423 is formed between the limiting protrusion 1421 and the limiting ridge 1422.

[0062] In this embodiment, the distal end of the movable shaft 13 enters the inner cavity of the handle housing 11 through an opening located at the proximal end of the handle housing 11, and the distal end of the movable shaft 13 passes through the transmission member 142. A first limiting member is provided on the outer side of the distal end of the movable shaft 13, and a second limiting member is provided at a corresponding position on the handle housing 11. The first limiting member and the second limiting member are configured to be movably connected along the axial direction of the drive handle 14, thereby restricting the movable shaft 13 to axial movement relative to the drive handle 14. In one example, the first limiting member is a protrusion, and the second limiting member is a groove extending along the axial direction. The protrusion is movably received in the groove, thereby restricting the movable shaft 13 to axial movement relative to the drive handle 14. The inner wall of the transmission member 142 is provided with an internal thread, and correspondingly, the outer wall of the movable shaft 13 is provided with an external thread. Through the threaded engagement of the two, the axial movement of the movable shaft 13 is driven by the rotation of the drive handle 14.

[0063] As described above, in this embodiment, the control wire 12 and the movable shaft 13 remain relatively stationary in the axial direction, and the torque applied to the movable shaft 13 is transmitted to the mitral valve clip connected to the control wire 12 at the distal end, thereby opening and closing the clamping arms in the mitral valve clip (i.e., changing the state of the mitral valve clip). In other embodiments, the movement of the control wire 12 realizes the release of the prosthesis 2 from the delivery device 1, or realizes the adjustment of the posture of the prosthesis 2, or realizes the change of the loading of the prosthesis 2 (for example, from a compressed state to an expanded state), etc. The control wire 12 of this embodiment can be made of metal wire. For example, the control wire 12 is made of nickel titanium or stainless steel.

[0064] In this embodiment, the movable shaft 13 is provided with a receiving cavity, in which the proximal end of the control wire 12 is fixedly received, thereby maintaining the control wire 12 and the movable shaft 13 in an axially relative position. In an alternative embodiment, the prosthesis delivery device further includes a wire-clamping shaft, which is used to secure the control wire 12 and is rotatably received in the receiving cavity of the movable shaft 13. When the movable shaft 13 drives the control wire 12 to move axially, a fixing member such as a latch secures the wire-clamping shaft to the movable shaft.

[0065] In this embodiment, the overload protection assembly 141 is sleeved outside the transmission member 142. The overload protection assembly 141 is configured to transmit torque below a threshold to the transmission member 142 while preventing torque above the threshold from being transmitted to the transmission member 142. In this embodiment, the torque applied to the overload protection assembly 141 is transmitted to the movable shaft 13 via the transmission member 142, and then transmitted to the mitral valve clip via the control wire 12 to open and close the clip arms 22.

[0066] Please refer to Figures 2 to 5. The overload protection assembly 141 includes a support member 41, a passive member 42 and an active member 43. The passive member 42 is configured to remain circumferentially stationary relative to the transmission member 142 and can move axially relative to the transmission member 142; the active member 43 is configured to remain axially stationary relative to the transmission member 142 and can rotate circumferentially relative to the transmission member 142; the support member 41 is used to keep the passive member 42 and the active member 43 in axial abutment. In this embodiment, the passive member 42 and the active member 43 respectively include a first abutment surface A and a second abutment surface B, that is, the passive member 42 includes a first abutment surface A, and the active member 43 includes a second abutment surface B. The first abutment surface A and the second abutment surface B are correspondingly arranged, and the first abutment surface A and the second abutment surface B are planes at least in the abutment portion, and the planes are not parallel to the axis of the drive handle 14. The present embodiment has no particular restriction on the angle between the plane and the axis of the driving handle 14, and can be set according to factors such as the material of the passive component 42 and the active component 43, the static friction coefficient, the threshold value of the torque and the force provided by the support member 41. For example, the first abutting surface A and the second abutting surface B are both planes perpendicular to the axis of the driving handle 14. For another example, as shown in Figure 4, the first abutting surface A of the passive component 42 includes a first vertical surface, a first horizontal surface and a first inclined surface connected in sequence, and the first vertical surface, the first horizontal surface and the first inclined surface define a first meshing tooth with a cross section of a right-angled trapezoid. At the corresponding position, the second abutting surface B of the active component 43 includes a second vertical surface, a second horizontal surface and a second inclined surface connected in sequence, and the second vertical surface, the second horizontal surface and the second inclined surface define a second meshing tooth with a cross section of a right-angled trapezoid. The first vertical plane and the second vertical plane are both planes parallel to the axis of the driving handle 14, the first horizontal plane and the second horizontal plane are both planes perpendicular to the axis of the driving handle 14, the first inclined plane and the second inclined plane are both planes arranged at an angle to the axis of the driving handle 14, and the arrangement angle of the first inclined plane is the same as the arrangement angle of the second inclined plane, the first vertical plane is configured to abut against the second vertical plane, the first horizontal plane is configured to abut against the second horizontal plane, the first inclined plane is configured to be arranged parallel to the second inclined plane, and is used to abut against the second inclined plane. When the first abutting surface A and the second abutting surface B of this embodiment abut, the first meshing teeth of the right-angled trapezoid and the second meshing teeth of the right-angled trapezoid engage, when the passive component 42 and the active component 43 rotate in one direction, the first horizontal plane abuts against the second horizontal plane, and the first inclined plane abuts against the second inclined plane, which can prevent overload; when the passive component 42 and the active component 43 rotate in another direction, the first vertical plane abuts against the second vertical plane, which cannot prevent overload. See the following description for details. In another embodiment, the first abutting surface A of the passive member 42 includes a third inclined surface and a fifth inclined surface connected to the third inclined surface, the third inclined surface and the fifth inclined surface are set to an obtuse angle, and the third inclined surface and the fifth inclined surface are connected to define a third meshing tooth with a triangular cross-section.At the corresponding position, the second abutting surface B includes a fourth inclined surface and a sixth inclined surface connected to the fourth inclined surface, the fourth inclined surface and the sixth inclined surface are set at an obtuse angle, and the fourth inclined surface and the sixth inclined surface are connected to define a fourth meshing tooth with a triangular cross-section. The third inclined surface and the fourth inclined surface are both planes arranged at an angle to the axis of the driving handle 14, and the arrangement angle of the third inclined surface is the same as the arrangement angle of the fourth inclined surface. The fifth inclined surface and the sixth inclined surface are both planes arranged at an angle to the axis of the driving handle 14, and the arrangement angle of the fifth inclined surface is the same as the arrangement angle of the sixth inclined surface. That is, the third inclined surface is configured to be arranged parallel to the fourth inclined surface and is used to abut against the fourth inclined surface, and the fifth inclined surface is configured to be arranged parallel to the sixth inclined surface and is used to abut against the sixth inclined surface. In this way, when the first abutting surface A and the second abutting surface B abut, the triangular third meshing teeth and the triangular fourth meshing teeth mesh, and when the passive component 42 and the active component 43 rotate in two directions, the third inclined surface abuts the fourth inclined surface, or the fifth inclined surface abuts the sixth inclined surface, both of which can prevent overload. In addition to surface contact, the first abutting surface A and the second abutting surface B can also be line contact or point contact. In an alternative embodiment, the first abutting surface A and the second abutting surface B are correspondingly arranged, and at least one of the first abutting surface A and the second abutting surface B is a curved surface at the abutting portion, and the first abutting surface A and the second abutting surface B are circumscribed at the abutting portion, and the circumscribed surface is not parallel to the axis of the driving handle 14. For example, the first abutting surface A is in the shape of a circular arc, and the second abutting surface B is also in the shape of a circular arc, and the radii of the two are equal. For another example, the shapes of the first abutting surface A and the second abutting surface B can refer to the gear tooth shape in the externally meshing gear set. In one example, the first abutting surface A and the second abutting surface B may be further sandblasted to increase surface roughness.

[0067] Please continue to refer to Figures 2 to 5. The passive member 42 is a hollow structure and is located at the proximal end of the transmission member 142. The passive member includes a first body 421 and a first abutting portion 422, and the first body 421 is located at the distal end of the first abutting portion 422. The first abutting surface A is provided on the proximal end face of the first abutting portion 422. In one example, the radial dimension of the first abutting portion 422 is greater than the radial dimension of the first body 421. In this way, the contact area of ​​the first abutting surface A can be increased, and a first blocking shoulder 423 can be formed at the connection between the first abutting portion 422 and the first body 421. The first blocking shoulder 423 is used to abut the support member 41. Correspondingly, the active member 43 is also a hollow structure and is located at the proximal end of the passive member. The active member includes a second body 431 and a second abutting portion 432, and the second body 431 is located at the proximal end of the second abutting portion 432. The second abutting surface B is provided on the distal end face of the second abutting portion 432. In an example, the radial dimension of the second abutting portion 432 may be larger than the radial dimension of the second body 431 to increase the contact area of ​​the second abutting surface B.

[0068] In this embodiment, the overload protection assembly 141 further includes a housing 44. The housing 44 is a hollow structure that is fixedly mounted on the outside of the transmission member 142. As the foundation of the overload protection assembly 141, the support member 41, the passive member 42, and the active member 43 are all mounted on the outer surface of the housing 44. Furthermore, at least the active member 43 can rotate circumferentially relative to the housing 44. In this embodiment, the housing 44 is fixedly connected to the transmission member 142 by welding, bonding, or other methods. In other embodiments, the housing 44 can be integrally formed with the transmission member 142.

[0069] Please continue to refer to Figure 2. The accommodating seat 44 of this embodiment includes a distal portion 442, a middle portion 441 and a proximal portion 443. The radial dimension of the distal portion 442 is greater than the radial dimension of the middle portion 441, forming a distal shoulder; the radial dimension of the middle portion 441 is greater than the radial dimension of the proximal portion 443, forming a proximal shoulder. Among them, the distal shoulder is used to support the support member 41. The proximal shoulder is used to abut the passive member 42 to limit and prevent the passive member 42 from moving too much toward the distal portion 442. The distal shoulder of this embodiment can provide support for the support member 41, and the support member 41 elastically supports the passive member 42 to keep the passive member 42 and the active member 43 in abutment, providing axial movement limitation for the passive member 42 and the active member 43. In one example, the distal portion 442 is fixedly connected to the limiting ridge 1422 to increase the fixing effect between the accommodating seat 44 and the transmission member 142. In one example, the radial dimension of the distal portion 442 is equal to the radial dimension of the limiting ridge 1422. The above-mentioned "radial" does not mean that the limiting ridge 1422, the distal portion 442, the middle portion 441 and the proximal portion 443 necessarily have a circular outer contour; for non-circular components, "radial" refers to the perpendicular direction from the edge to the axis.

[0070] Continuing to refer to Figures 1 and 2, in this embodiment, the radial dimension of the limiting ridge 1422 is greater than the radial dimension of the limiting protrusion 1421. Thus, increasing the area of ​​the limiting ridge 1422 not only enhances the limiting effect of the limiting ridge 1422 on the axial movement of the handle housing 11, but also increases the fixed connection area between the limiting ridge 1422 and the distal portion 442 of the receiving seat 44, thereby further enhancing the fixing effect between the receiving seat 44 and the transmission member 142.

[0071] Referring to Figure 2 , the support member 41 is a compression spring, one end of which abuts the distal shoulder of the receiving seat 44 , while the other end abuts the first blocking shoulder 423 of the passive member 42 . In this embodiment, the support member 41 is a compression spring. Using a compression spring is a readily available and low-cost material.

[0072] Referring to Figures 3 to 6, an axially extending first anti-rotation groove 4211 is provided on the first body 421 of the passive member 42, and a first anti-rotation pin 4411 is provided on the outer surface of the proximal portion 443 of the accommodating seat 44. The first anti-rotation pin 4411 is configured to be axially movably accommodated in the first anti-rotation groove 4211. In this way, the passive member 42 of this embodiment can remain circumferentially stationary relative to the accommodating seat 44 and can move axially relative to the accommodating seat 44. Since the accommodating seat 44 is fixedly connected to the transmission member 142, the passive member 42 can remain circumferentially stationary relative to the transmission member 142 and can move axially relative to the transmission member 142.

[0073] In this embodiment, the overload protection assembly 141 also includes a transmission housing 45, which is coaxially sleeved on the outside of the active part 43 to receive external torque and transmit it to the active part 43. The active part 43 is configured to remain circumferentially stationary relative to the transmission housing 45. The active part 43 of this embodiment can rotate synchronously with the transmission housing 45. The operator drives the active part 43 to rotate by driving the transmission housing 45, and the active part 43 drives the passive part 42 to rotate, and the passive part 42 synchronously drives the accommodating seat 44 and the transmission part 142 to rotate. In one example, the transmission housing 45 can also cover the passive part 42, the accommodating seat 44, etc. to prevent foreign matter from entering. Please refer to Figure 7. In one example, the outer surface of the transmission housing 45 is provided with an anti-slip structure 452. The anti-slip structure 452 can increase the friction when the operator applies torque to the transmission housing 45 to prevent slipping.

[0074] Continuing to refer to Figures 2 to 7, the second body 431 of the active member 43 is provided with an axially extending second anti-rotation groove 4311, and the inner wall of the transmission housing 45 is provided with a second anti-rotation pin 451, which is axially movably accommodated in the second anti-rotation groove 4311. In this embodiment, by providing the second anti-rotation groove 4311 on the second body 431 and the second anti-rotation pin 451 on the inner wall of the transmission housing 45, the two cooperate to achieve the active member 43 and the transmission housing 45 to maintain relative circumferential stillness and synchronous rotation, and the implementation method is simple. In other alternative embodiments, the active member 43 can also be fixedly connected to the transmission housing 45.

[0075] This embodiment does not impose any particular restrictions on the specific number of the first anti-rotation groove 4211 and the first anti-rotation pin 4411, as well as the specific number of the second anti-rotation groove 4311 and the second anti-rotation pin 451. In one example, the number of the first anti-rotation groove 4211 and the first anti-rotation pin 4411 are both multiple, and the multiple first anti-rotation grooves 4211 are evenly spaced in the circumferential direction of the first body 421; the number of the second anti-rotation groove 4311 and the second anti-rotation pin 451 are both multiple, and the multiple second anti-rotation grooves 4311 are evenly spaced in the circumferential direction of the second body 431. The number of the first anti-rotation groove 4211 and the first anti-rotation pin 4411, as well as the number of the second anti-rotation groove 4311 and the second anti-rotation pin 451 are set to multiple, which can improve the overall structural strength of the overload protection assembly 141. For example, the number of the first anti-rotation groove 4211 and the first anti-rotation pin 4411 are both two, and the two first anti-rotation grooves 4211 are symmetrically arranged about the central axis of the passive component 42. For another example, the number of the second anti-rotation grooves 4311 and the number of the second anti-rotation pins 451 are both two, and the two second anti-rotation grooves 4311 are symmetrically arranged about the central axis of the active member 43 .

[0076] Continuing with Figure 2 , the overload protection assembly 141 also includes a housing cover 46 having a coupling portion 461 at its distal end and a blocking portion 462 at its proximal end. The coupling portion 461 is configured to couple with the proximal end of the housing seat 44 to removably secure the housing cover 46 thereto. The blocking portion 462 is configured to maintain the active member 43 axially stationary relative to the transmission member 142. In one example, the housing cover 46 and the housing seat 44 are coupled using a snap-fit ​​or threaded connection. As shown in Figure 2 , the coupling portion 461 is externally threaded, while the proximal end of the housing seat 44 is internally threaded, with the two being threadedly connected. In one example, the blocking portion 462 has a radial dimension greater than that of the second body 431 of the active member 43, thereby forming a second blocking shoulder. When the coupling portion 461 is threadedly connected to the proximal end, the second blocking shoulder abuts the proximal end of the second body 431. This allows the blocking portion 462, in conjunction with the support member 41, to prevent axial movement of the active member 43 and the transmission housing 45.

[0077] The overload protection principle of the overload protection component in the prosthesis delivery device of this embodiment is described below with reference to FIG. 2 to FIG. 8 :

[0078] External torque is transmitted to the active member 43 through the cooperation of the second stop pin 451 and the second stop groove 4311, and then transmitted to the passive member 42 through the cooperation of the second meshing teeth with a right-angled trapezoidal cross section and the first meshing teeth with a right-angled trapezoidal cross section. The passive member 42 transmits the torque to the accommodating seat 44 through the cooperation of the first stop pin 4411 and the first stop groove 4211, and then the accommodating seat 44 transmits the torque to the transmission member 142. The transmission member 142 rotates and, through the threaded transmission, causes the movable shaft 13 and the control wire 12 to move axially toward the distal end (or proximal end).

[0079] 1) When a counterclockwise torque is applied to the transmission housing 45 (as shown in Figures 5 and 7, viewed from the proximal end to the distal end), the first vertical surface in the first abutting surface A on the first meshing tooth of the passive component 42 and the second vertical surface in the second abutting surface B on the second meshing tooth of the active component 43 abut against each other. Since the first vertical surface and the second vertical surface are parallel to the axis, that is, perpendicular to the tangential direction of rotation of the passive component 42 and the active component 43, no matter how large the torque is transmitted, the force direction of the passive component 42 is always along the tangential direction without axial force, and the passive component 42 and the active component 43 will never rotate relative to each other (that is, "slip"). Therefore, the overload protection component 141 with the first meshing tooth of a right-angled trapezoid and the second meshing tooth with a right-angled trapezoidal cross-section has no overload protection function when transmitting counterclockwise torque.

[0080] 2) When a clockwise torque is applied to the transmission housing 45, the second inclined surface in the second abutting surface B on the second meshing tooth of the active member 43 abuts the first inclined surface in the first abutting surface A on the first meshing tooth of the passive member 42, or the second horizontal surface in the second abutting surface B on the second meshing tooth of the active member 43 abuts the first horizontal surface in the first abutting surface A on the first meshing tooth of the passive member 42.

[0081] As shown in FIG8 , the active member 43 transmits torque to the passive member 42 through the contact between the second inclined surface and the first inclined surface.

[0082] Among them, F 扭力 is the torque corresponding to the external torque;

[0083] F 扭力-1 F 扭力 a component of force along the direction of the first inclined surface;

[0084] F 扭力-2 F 扭力 The component of force perpendicular to the direction of the first inclined plane.

[0085] F 压力 The reactive force exerted by the active member 43 on the passive member 42 due to the passive member 42 abutting against the active member 43 under the action of the support member 41;

[0086] F压力-1 F 压力 a component of force along the direction of the first inclined surface;

[0087] F 压力-2 F 压力 The component of force perpendicular to the direction of the first inclined plane.

[0088] When the torque is not higher than the threshold, F 扭力-1 With F 压力-1 The resultant force does not exceed the maximum static friction between the passive member 42 and the active member 43, that is, F 扭力-1 -F 压力-1 ≤(F 扭力-2 +F 压力-2 ) × f, where f is the coefficient of static friction. At this point, the first meshing teeth of the passive member 42 and the second meshing teeth of the active member 43 remain engaged, transmitting torque to the accommodating seat 44 and the transmission member 142. The transmission member 142 cooperates with the movable shaft 13 to convert the rotational motion into linear motion of the movable shaft 13 and the control wire 12.

[0089] When the torque is higher than the threshold, F 扭力-1 With F 压力-1 The resultant force exceeds the maximum static friction between the passive member 42 and the active member 43, that is, F 扭力-1 -F 压力-1 >(F 扭力-2 +F 压力-2 ) × f, where f is the coefficient of static friction. At this point, relative circumferential motion occurs between the passive component 42 and the active component 43. The active component 43 is unable to transmit torque to the passive component 42, causing it to idle and "slip." Consequently, the movable shaft 13 and control wire 12 are no longer driven to move, thus achieving overload protection.

[0090] The prosthesis delivery device provided in an embodiment of the present application includes a handle housing, a control wire, a movable shaft and a driving handle. The distal end of the control wire is used to connect to the prosthesis. The movable shaft is movably accommodated in the handle housing and is used to drive the prosthesis to change state by driving the control wire to move. The driving handle can rotate relative to the handle housing to drive the movable shaft to move and transmit external torque to the prosthesis. The driving handle includes an overload protection component, which is used to transmit torque that does not exceed a threshold to the movable shaft and prevent torque above the threshold from being transmitted to the movable shaft. The prosthesis delivery device solves the problem of excessive force that is easily caused when the driving handle operates the distal prosthesis through the overload protection component. Excessive force / torque can cause the control wire to break, the prosthesis to fail or be damaged, and may also cause damage to human tissue. The prosthesis delivery device provided in an embodiment of the present application improves the reliability of the prosthesis system and the safety of operation.

[0091] In the above description, the reference terms "one embodiment", "some embodiments", "example", "specific example", etc. mean 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 application. In this specification, the schematic representations of the above terms do 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 this specification and features of different embodiments or examples without contradiction.

[0092] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A prosthesis delivery device, comprising: Handle housing; A control wire, the distal end of which is used to connect with the prosthesis; A moving shaft, movably accommodated in the handle housing, and used to drive the prosthesis to change state by driving the control wire to move; The driving handle can be rotated relative to the handle housing to drive the movable shaft to move and transmit the external torque to the prosthesis. The driving handle includes an overload protection component, which is configured to transmit a torque not exceeding a threshold to the movable shaft and prevent a torque above the threshold from being transmitted to the movable shaft.

2. The prosthesis delivery device of claim 1, wherein: The driving handle also includes a transmission member, which is threadably matched with the moving shaft to drive the moving shaft to move, and the overload protection component is sleeved on the outer side of the transmission member.

3. The prosthesis delivery device of claim 2, wherein: The overload protection assembly comprises a support member, a passive member and an active member, wherein the passive member is configured to be circumferentially stationary relative to the transmission member and axially movable relative to the transmission member; The active member is configured to be axially stationary relative to the transmission member and circumferentially rotatable relative to the transmission member; The support member is used to keep the passive member and the active member in axial contact; The passive component includes a first abutting surface, and the active component includes a second abutting surface. The first abutting surface and the second abutting surface are arranged correspondingly. The first abutting surface and the second abutting surface are planes at least in the abutting position, and the planes are not parallel to the axis of the driving handle.

4. The prosthesis delivery device of claim 3, wherein: The first abutting surface and the second abutting surface are both planes perpendicular to the axis of the driving handle.

5. The prosthesis delivery device of claim 3, wherein: The first abutting surface includes a first vertical surface, a first horizontal surface and a first inclined surface connected in sequence; the second abutting surface includes a second vertical surface, a second horizontal surface and a second inclined surface connected in sequence; the first vertical surface and the second vertical surface are both planes parallel to the axis of the driving handle, the first horizontal surface and the second horizontal surface are both planes perpendicular to the axis of the driving handle, and the first inclined surface and the second inclined surface are both planes arranged at an angle to the axis of the driving handle, and the angles are the same.

6. The prosthesis delivery device of claim 3, wherein: The first abutting surface includes a third inclined plane and a fifth inclined plane connected to the third inclined plane, and the third inclined plane and the fifth inclined plane are set at an obtuse angle; the second abutting surface includes a fourth inclined plane and a sixth inclined plane connected to the fourth inclined plane, and the fourth inclined plane and the sixth inclined plane are set at an obtuse angle; the third inclined plane and the fourth inclined plane are both planes arranged at an angle to the axis of the driving handle, and the arrangement angle of the third inclined plane is the same as the arrangement angle of the fourth inclined plane, and the fifth inclined plane and the sixth inclined plane are both planes arranged at an angle to the axis of the driving handle, and the arrangement angle of the fifth inclined plane is the same as the arrangement angle of the sixth inclined plane.

7. The prosthesis delivery device of claim 2, wherein: The overload protection assembly comprises a support member, a passive member and an active member, wherein the passive member is configured to be circumferentially stationary relative to the transmission member and axially movable relative to the transmission member; The active member is configured to be axially stationary relative to the transmission member and circumferentially rotatable relative to the transmission member; The support member is used to keep the passive member and the active member in axial contact; The passive component includes a first abutting surface, and the active component includes a second abutting surface. The first abutting surface and the second abutting surface are arranged correspondingly. At least one of the first abutting surface and the second abutting surface is a curved surface at the abutting position, and the first abutting surface and the second abutting surface are circumscribed at the abutting position, and the circumscribed surface is not parallel to the axis of the driving handle.

8. The prosthesis delivery device according to claim 3 or 7, wherein: The first abutting surface and the second abutting surface are both sandblasted to increase surface roughness.

9. The prosthesis delivery device according to claim 3 or 7, wherein: The passive component comprises a first body and a first abutting portion, the first body is located at the distal end of the first abutting portion, and the first abutting surface is arranged at the proximal end surface of the first abutting portion; The active member includes a second body and a second abutting portion, the second body is located at the proximal end of the second abutting portion, and the second abutting surface is arranged on the distal end surface of the second abutting portion.

10. The prosthesis delivery device of claim 9, wherein: The radial dimension of the first abutting portion is greater than the radial dimension of the first body. A first blocking shoulder is formed at a connection between the first abutting portion and the first body. The first blocking shoulder is used to abut against the support member.

11. The prosthesis delivery device of claim 10, wherein: The overload protection assembly also includes a accommodating seat, which is fixedly sleeved on the outside of the transmission member, and the support member, the active member and the passive member are coaxially sleeved on the outer surface of the accommodating seat; the accommodating seat includes a distal part, a middle part and a proximal part; the radial dimension of the distal part is larger than the radial dimension of the middle part, forming a distal shoulder, the radial dimension of the middle part is larger than the radial dimension of the proximal part, forming a proximal shoulder, the distal shoulder is used to support the support member, and the proximal shoulder is used to abut the passive member to limit and prevent the passive member from moving too much toward the distal part.

12. The prosthesis delivery device of claim 11, wherein: The support member is a compression spring, one end of the compression spring abuts against the distal shoulder, and the other end of the compression spring abuts against the first blocking shoulder.

13. The prosthesis delivery device of claim 11, wherein: A first anti-rotation groove is arranged on the first body of the passive component, and a first anti-rotation pin is arranged on the outer surface of the proximal portion. The first anti-rotation pin can be axially movably accommodated in the first anti-rotation groove.

14. The prosthesis delivery device of claim 11, wherein: The overload protection assembly further comprises a transmission housing, which is coaxially sleeved on the outside of the active member to receive external torque and transmit it to the active member, and the active member is configured to remain circumferentially stationary relative to the transmission housing.

15. The prosthesis delivery device of claim 14, wherein: A second anti-rotation groove is arranged on the second body of the active member, and a second anti-rotation pin is arranged on the inner wall of the transmission housing. The second anti-rotation pin is axially movably accommodated in the second anti-rotation groove.

16. The prosthesis delivery device of claim 11, wherein: The overload protection assembly also includes a accommodating cover, the distal end of the accommodating cover has an axially extending coupling portion, the proximal end of the accommodating cover has a circumferentially extending blocking portion, the coupling portion is coupled to the proximal end of the accommodating seat to detachably fix the accommodating cover to the accommodating seat, and the blocking portion is used to keep the active member axially stationary relative to the transmission member.

17. The prosthesis delivery device of claim 2, wherein: The handle shell includes an inner cavity, and the proximal end of the handle shell is provided with an opening, and the distal end of the transmission member enters the inner cavity of the handle shell through the opening, and the transmission member is configured to be able to rotate only relative to the handle shell.

18. The prosthesis delivery device of claim 17, wherein: The transmission member has a limiting protrusion located at the distal end and a limiting ridge located near the limiting protrusion, the limiting protrusion is circumferentially arranged on the transmission member and disposed inside the handle housing, the limiting ridge is circumferentially arranged on the transmission member and disposed outside the handle housing, and an open groove is formed between the limiting protrusion and the limiting ridge; The opening is contracted to form an opening shoulder, and the opening shoulder is accommodated in the opening groove.

19. The prosthesis delivery device of claim 18, wherein: The radial dimension of the limiting ridge is greater than the radial dimension of the limiting protrusion.

20. A prosthesis system, comprising the prosthesis delivery device according to any one of claims 1 to 19 and a prosthesis.

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