Conveyor device and conveyor system

Abstract

The present invention discloses a conveying device and a conveying system. The conveying device includes a catheter assembly and a control mechanism. The catheter assembly includes an outer sheath and a sheath core. The control mechanism can control the movement of the outer sheath. A TIP head is provided at the distal end of the sheath core. The control mechanism includes a fixed component and a movable component. The movable component is disposed near the proximal end of the fixed component. The proximal end portion of the outer sheath passes through the fixed component and is connected to the movable component. And under the control of the movable component, the outer sheath can move relative to the fixed component. When the distal end face of the outer sheath abuts against the proximal end face of the TIP head, the distal end face of the movable component is separated from the proximal end face of the fixed component. Thereby providing a compressible stroke for the outer sheath, and solving the problem that when the outer sheath of the conveying device loads an implant, the outer sheath is shortened or the sheath core is elongated, resulting in the inability to close the distal end of the outer sheath and the TIP head after loading the implant.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a delivery device and a delivery system. Background Art

[0002] The human heart is divided into four chambers, each with its own "exit". There are four types of valves (mitral valve, aortic valve, pulmonary valve and tricuspid valve), which ensure that the blood pumped by the heart flows in the cardiovascular system in a specified direction. The aortic valve is located between the left ventricle and the ascending aorta. Its function is to ensure that the blood flow from the left ventricle can flow into the aorta in one direction, and not the other way around. When the aortic valve opens, the high-pressure blood in the ventricle flows into the aorta through the aortic valve, and then the valve closes. At this time, the blood injected into the aorta cannot flow back into the left ventricle through the aortic valve. However, the occurrence of various heart diseases or degenerative lesions can cause partial valve dysfunction, such as valve calcification, aortic valve insufficiency, etc. Such lesions can affect the normal functioning of the heart, causing people to gradually weaken or endanger their lives.

[0003] In view of the loss of aortic valve function, there are currently a variety of treatment methods and devices to treat aortic valve dysfunction, such as traditional valve replacement surgery, which is considered an "open heart" surgery. However, this type of surgery is not suitable for all patients due to its complex operation and greater trauma. In addition, surgery to replace the aortic valve through intervention has gradually attracted people's attention. In this type of technology, a self-expanding prosthetic valve is generally installed in a curled state at the end of a flexible catheter and pushed through the patient's blood vessels or body until the prosthetic valve reaches the implantation site. The prosthetic valve then expands to its functional size at the site of the defective natural aortic valve.

[0004] When performing transcatheter aortic valve replacement, the usual surgical route is to enter from the human femoral artery and push the delivery system loaded with the prosthetic valve through the aorta to the diseased valve. At this time, the delivery system needs to pass through the entire aortic arch. In order to make it easier for the delivery system to pass through the curved blood vessels in the arch, the usual practice is to reduce the outer diameter of the sheath as much as possible. However, this often leads to a greater compression deformation of the valve during the process of being accommodated in the sheath, so the loading force will also increase accordingly. During loading, it is easy to cause the sheath / sheath core of the delivery system to be stretched or shortened, and the delivery system cannot be closed after loading, resulting in difficulty or failure of the operation. Summary of the invention

[0005] The present invention provides a conveying device, which includes a catheter assembly and a control mechanism. The catheter assembly includes an outer sheath and a sheath core. The control mechanism can control the movement of the outer sheath. A TIP head is provided at the distal end of the sheath core. The control mechanism includes a fixed component and a movable component. The movable component is arranged near the proximal end of the fixed component. The proximal end portion of the outer sheath passes through the fixed component and is connected to the movable component. And under the control of the movable component, the outer sheath can move relative to the fixed component. When the distal end face of the outer sheath abuts against the proximal end face of the TIP head, the distal end face of the movable component is separated from the proximal end face of the fixed component.

[0006] In one embodiment, the proximal end portion of the fixed component includes a receiving portion with an opening facing the proximal end, and the receiving portion can receive the distal end portion of the fixed component; or the distal end portion of the movable component includes a receiving portion with an opening facing the distal end, and the receiving portion can receive the proximal end portion of the fixed component.

[0007] In one embodiment, a stop position is provided on the outer surface of the distal end portion of the movable component or the outer surface of the proximal end portion of the fixed component. When the end face of the receiving portion near the stop position abuts against the stop position, the movable component has no axial movement relative to the fixed component.

[0008] In one embodiment, the movable component includes an elastic member and a movable member. The proximal end of the fixed component includes a receiving portion with an opening facing the proximal end or the distal end of the movable component includes a receiving portion with an opening facing the distal end. The elastic member is arranged in the inner cavity of the receiving portion. The movable member is arranged near the elastic member, and at least part of the movable member is received by the receiving portion and is movably connected to the receiving portion, so that the elastic member is in a compressed state.

[0009] In one embodiment, a first limiting member is provided on the inner wall of the receiving portion, and a second limiting member is provided on the movable member. When the first limiting member contacts the second limiting member, the movable member is restricted from moving away from the receiving portion.

[0010] In one embodiment, the movable member can move towards the bottom surface of the inner cavity of the receiving portion, compress the elastic member and separate the first limiting member from the second limiting member.

[0011] The present invention also provides a conveying system, which includes the conveying device described in any one of the above and an implant, and the implant can be loaded in the outer sheath.

[0012] In one embodiment, after the implant is loaded into the outer sheath tube, the distal end face of the outer sheath tube abuts against the proximal end face of the TIP head, and the distance between the distal end face of the movable assembly and the proximal end face of the fixed assembly is shorter than the distance between the distal end face of the movable assembly and the proximal end face of the fixed assembly before loading the implant.

[0013] In one embodiment, the fixed assembly further includes a movable track, the movable assembly includes an operating part, the operating part has an inner cavity, the movable track passes through the inner cavity of the operating part, and the operating part can axially move relative to the fixed assembly along the movable track.

[0014] In one embodiment, when the first limiting member is separated from the second limiting member, the operating part can further move towards the distal end.

[0015] The delivery device and delivery system of the present invention, by providing a movable assembly and a fixed assembly, and before loading the implant, the distal end face of the movable assembly and the proximal end face of the fixed assembly are separated, providing a compressible stroke for the outer sheath tube, and solving the problem that when loading the implant, the outer sheath tube of the delivery device is shortened or the sheath core is stretched, resulting in the inability to close the distal end of the outer sheath tube and the TIP head after loading the implant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the delivery device according to an embodiment of the present invention;

[0017] Figure 2 is Figure 1 an enlarged schematic diagram of a partial structure of the shown delivery device;

[0018] Figure 3 is Figure 1 a partial structure exploded view of the control mechanism of the shown delivery device;

[0019] Figure 4 is Figure 3 a combined view of a partial structure of the shown control mechanism;

[0020] Figure 5 is Figure 4 a cross-sectional schematic diagram of a partial structure of the shown control mechanism;

[0021] Figure 6 is Figure 5 a cross-sectional exploded schematic diagram of a partial structure of the shown control mechanism;

[0022] Figure 7.1 is Figure 1 a partial cross-sectional structure schematic diagram of the shown delivery device;

[0023] Figure 7.2 is Figure 7.1 a partially enlarged schematic diagram of the structure;

[0024] Figure 8 is a schematic diagram of the structure of the conveying device in the conveying system according to an embodiment of the present invention;

[0025] Figure 9 is a schematic diagram of the structure of the conveying system according to an embodiment of the present invention, and is Figure 8 the process state of the conveying device shown in loading the implant;

[0026] Figure 10 is Figure 9 a schematic diagram of the structure of the conveying system after completion of loading shown in;

[0027] Figure 11 is a schematic cross-sectional structure diagram of the control mechanism of the conveying device according to another embodiment of the present invention;

[0028] Figure 12 is Figure 11 a partial cross-sectional structure diagram of the control mechanism of the conveying device shown in;

[0029] Figure 13 is a schematic cross-sectional structure diagram of the control mechanism of the conveying device according to still another embodiment of the present invention;

[0030] Figure 14 is a schematic cross-sectional structure diagram of the control mechanism of the conveying device according to yet another embodiment of the present invention. Specific embodiments

[0031] For a better understanding of the technical solutions and effective effects of the present invention, the following gives examples of the technical solutions of the present invention with reference to the accompanying drawings. The following specific embodiments are only partial embodiments and do not limit the present invention.

[0032] Unless otherwise specified, the meanings of the technical terms adopted by the present invention are the common meanings understood by those skilled in the art.

[0033] In the field of medical devices, the end close to the operator is defined as the proximal end, and the end far from the operator is defined as the distal end, and the proximal and distal ends of a certain component, as well as the relative positional relationship between components, are described thereby.

[0034] Embodiment 1

[0035] As Figure 1 and Figure 2As shown in the figure, the delivery device 100 of this embodiment includes a control mechanism 10 and a catheter assembly 20. The operator can control the movement of the catheter assembly 20 through the control mechanism 10. Among them, the catheter assembly 20 includes an outer sheath 21 and a sheath core 22. The outer sheath 21 is a hollow tube body with an inner cavity, and the sheath core 22 is inserted into the inner cavity of the outer sheath 21. A TIP head 23 is provided at the distal end of the sheath core 22. The TIP head 23 is a conical structure with an outer diameter gradually tapering towards the distal end, and is made of a polymer material to guide the movement of the delivery device in the blood vessel. The outer sheath 21 can be moved closer to or away from the TIP head 23 under the control of the control mechanism 11. When the distal end face of the outer sheath 21 abuts against the proximal end face of the TIP head 23, the outer sheath 21 is blocked by the TIP head 23 and cannot continue to move distally.

[0036] Combined with Figure 1 and Figure 3 As shown in the figure, the control mechanism 10 includes a fixed component 11 and a movable component 12. The fixed component 11 and the movable component 12 are arranged adjacent to each other, and the movable component 12 is arranged near the proximal end of the fixed component 11. The proximal end portion of the outer sheath 21 passes through the fixed component 11 and is connected to the movable component 12, and can move relative to the fixed component 11 and the sheath core 22 under the control of the movable component 12. When the distal end face of the outer sheath 21 abuts against the proximal end face of the TIP head 23, the distal end face of the movable component 12 is separated from the proximal end face of the fixed component 11, that is, there is no contact between the two.

[0037] The fixed component 11 includes a handheld portion 112 and a mounting seat 111. Among them, both the handheld portion 112 and the mounting seat include a hollow housing with openings at both ends, and the mounting seat 111 is arranged in the cavity of the handheld portion 112 and is fixed relative to the handheld portion 112. The mounting seat 111 and the handheld portion 112 can be connected in various ways. For example, grooves can be provided on the outer surface of the mounting seat 111, and correspondingly, ribs matching the grooves can be provided on the inner surface of the handheld portion 112. The relative fixation of the mounting seat 111 and the handheld portion 112 is achieved by the clamping of the ribs and the grooves. It can be understood that the handheld portion can be formed by splicing two shells, or can be integrally processed. Similarly, the mounting seat 111 can also be formed by splicing at least two parts of the shell, or can be integrally processed.

[0038] As Figure 4 and Figure 5As shown, the mounting base 111 includes a middle portion 1111 with a reduced outer diameter, a proximal end portion 1112 provided at the proximal end of the middle portion 1111, and a distal end portion 1113 provided at the distal end of the middle portion 1111. Among them, the outer diameters of both the middle portion 1111 and the proximal end portion 1112 are smaller than the outer diameter of the distal end portion 1113, and the outer diameter of the proximal end portion 1112 is smaller than the outer diameter of the middle portion 1111. In other embodiments, the outer diameter of the proximal end portion 1112 may also be slightly larger than the outer diameter of the middle portion 1111, but still smaller than the outer diameter of the distal end portion 1113. Thus, a receiving portion 119 with an opening facing the proximal end is formed between the outer surface of the mounting base 111 and the inner surface of the handheld portion 112 (see Figure 7.1 and Figure 7.2 ), and the bottom surface of the receiving portion 119 is formed at the distal end of the middle portion 1111.

[0039] As Figures 3 to 6 shown, the movable assembly 12 includes an elastic member 121 and a movable member 122. Among them, the elastic member 121 is disposed in the inner cavity of the receiving portion 119, the movable member 122 is disposed near the proximal end of the elastic member 121, the movable member 122 is partially received in the receiving portion 119, and is movably connected to the receiving portion 119, such that the elastic member 121 is in a compressed state.

[0040] Specifically, the fixing assembly 11 further includes a base 113, and the base 113 is sleeved on the middle portion 1111 of the mounting base 111. In this embodiment, the base 113 has a hollow annular structure, and an internal thread is provided on the inner wall of the base 113, and an external thread is provided on the middle portion 1111. Thus, the base 113 and the middle portion 1111 are connected by threads, such that the base 113 is fixed on the mounting base 111, and the base 113 is received in the receiving portion 119 between the mounting base 111 and the handheld portion 112. The elastic member 121 is a spring, sleeved on the outer periphery of the proximal end portion 1112 of the mounting base 111, and the distal end face of the elastic member 121 abuts against the proximal end face of the base 113.

[0041] As Figure 5 and Figure 6As shown, the movable member 122 has a hollow structure with openings at both ends and the openings at both ends are connected. The outer surface of the movable member 122 is provided with a step, such that the outer diameter of the proximal end portion is greater than the outer diameter of the distal end portion, and the outer diameter of the proximal end portion is less than the inner diameter of the receiving portion 119. The distal end portion of the movable member 122 is inserted into the elastic member 121, such that the proximal end face of the elastic member 121 abuts against the step surface of the outer surface of the movable member 122. To achieve continuous pressing of the elastic member 121 by the movable member 122, a first limiting member 117 is provided on the inner surface of the receiving portion 119, and a second limiting member 123 is provided on the inner surface of the distal end portion of the movable member 122. In this embodiment, both the first limiting member 117 and the second limiting member 123 are convex portions slightly in a hook shape. In the natural state, the first limiting member 117 and the second limiting member 123 are in contact. When the movable member 122 is subjected to a force towards the distal end and moves towards the distal end, the first limiting member 117 and the second limiting member 123 move away from each other, and the elastic member 121 is further compressed; when the force towards the distal end is removed, the movable member 122 moves towards the proximal end under the action of the elastic member 121, and the second limiting member 123 also moves towards the proximal end. When the second limiting member 123 and the first limiting member 117 are in contact, the movable member 122 stops moving, thereby restricting the movable member 122 from moving away from the receiving portion 119 and keeping the elastic member 121 in a compressed state all the time. In this embodiment, the first limiting member 117 is provided on the proximal end of the outer surface of the proximal end portion 1112 of the mounting base 111 and has a hook-shaped structure extending towards the distal end. It can be understood that the first limiting member and the second limiting member can be continuously provided along the circumferential direction or can be distributed in a discontinuous manner.

[0042] It can be understood that in other embodiments, the base 113 may not be provided. At this time, the distal end of the elastic member 121 can directly contact the bottom surface of the receiving portion 119 and is always abutted against the bottom surface of the receiving portion 119 under the action of the movable member 122.

[0043] It can also be understood that in other embodiments, the receiving portion can also be provided on the movable assembly. Specifically, the receiving portion can be provided at the distal end of the handheld portion, with the opening facing the distal end, and the elastic member is received therein, and the movable member is also partially limited within the receiving portion. The specific structure of this part is the same as that of this embodiment, and only the corresponding structure needs to be adjusted to the operation portion.

[0044] Such as Figure 3 、 Figure 7.1 and Figure 7.2As shown, the conveying device further includes a protective sleeve 116 and a movable track 114. Among them, the protective sleeve 116 is arranged at the distal end of the fixed component 11. Specifically, the protective sleeve 116 is snap-fitted on the distal opening of the handheld part 112, and the protective sleeve 116 is generally in a conical structure with an outer diameter gradually decreasing from the proximal end to the distal end, so as to protect the outer sheath 21 and buffer the stress of the distal end of the handheld part 112 on the outer sheath 21. Preferably, the protective sleeve 116 can be made of a material with a hardness slightly lower than that of the material used to make the handheld part 112.

[0045] In this embodiment, an annular ridge 115 is provided at a position of the movable track 114 close to the distal end. The annular ridge 115 is engaged with a groove 118 on the inner surface of the mounting seat 111, so that the movable track 114 is fixed relative to the mounting seat 111 and the handheld part 112. Except for the distal end part, the movable track 114 is exposed at the proximal end of the fixed component 11.

[0046] The movable component further includes an operating part 124. The operating part 124 has an inner cavity with openings at both ends, and the inner cavity of the operating part 124 communicates with the openings at both ends. The inner diameter of the distal end of the inner cavity of the operating part 124 is smaller than the outer diameter of the proximal end part of the movable part 122. During the movement, the distal end face of the operating part 124 can be away from the proximal end face of the movable part 122 or abut against the proximal end face of the movable part 122.

[0047] The operating part 124 is sleeved on the part of the movable track 114 that is exposed at the proximal end of the fixed component 11, and the inner surface of the handheld part 124 is in direct contact with the movable track 114. Part of the external thread is provided on the outer surface of the movable track 114 that is exposed at the proximal end of the fixed component 11, and an internal thread matching the external thread on the outer surface of the movable track 114 is provided inside the operating part 124. Thus, by rotating the operating part 124, the operating part 124 can rotate circumferentially and move axially on the movable track 114, and approach or move away from the fixed component 11. From the perspective of ergonomics, for the operator to operate comfortably, preferably, the outer diameter has a natural transition when the operating part contacts the handheld part, and when the distal end face of the operating part abuts against the proximal end face of the handheld part, the operating part cannot continue to move towards the handheld part.

[0048] Both ends of the movable track 114 are provided with openings, and an inner cavity that connects the openings at both ends is provided inside. A sidewall opening 1141 that communicates with the inner cavity is also formed on the outer surface of the movable track 114. The sidewall opening 1141 extends along the length direction of the movable track 114 on the outer surface of the movable track 114, but the extension length does not exceed the length of the movable track 114. The movable assembly 12 further includes a connecting member 125. The connecting member 125 is disposed in the inner cavity of the movable track 114, and a proximal portion of the connecting member 125 extends out from the sidewall opening 1141, so as to be clamped on the hand-held portion 124, thereby achieving relative fixation with the operating portion 124. Both ends of the connecting member 125 are also provided with openings, and an inner cavity that communicates with the openings at both ends is provided inside. The proximal end portion of the outer sheath 21 is inserted into the inner cavity of the connecting member 125 and connected to the connecting member 125, and the two can be connected by means of welding, bonding or screw connection. Therefore, when the hand-held portion 125 moves on the movable track 124, it will drive the connecting member 125 to move along the length direction of the movable track 114 in the sidewall opening 1141, thereby driving the outer sheath 21 to move through the connecting member 125.

[0049] In the natural state, the distal end face of the outer sheath 21 abuts against the proximal end face of the TIP head 23, and the distal end face of the operating portion 124 abuts against the proximal end face of the movable member 122, and the distal end face of the operating portion 124 is separated from the proximal end face of the hand-held portion 112. Although when the operating portion 124 moves distally, the elastic member 121 can still be compressed by means of the movable member 122, since the TIP head 23 restricts the outer sheath 21 from continuing to move distally, the operating portion 124 cannot continue to move distally and the elastic member 121 cannot continue to be compressed without damaging the outer sheath. It can be understood that in other embodiments, in the natural state, the distal end face of the operating portion may also be separated from the proximal end face of the movable member. However, in any case, the distal end face of the operating portion is separated from the proximal end face of the hand-held portion, so that it can still be ensured that when loading the implant, after the outer sheath is shortened or the sheath core is elongated, the operating portion still has a travel distance to move distally, thereby driving the outer sheath to continue to move distally.

[0050] Such as Figures 8 to 10As shown, the present invention further provides a delivery system 300. The delivery system 300 includes the delivery device 100 and the implant 200 of the present invention. The implant 200 can be loaded into the outer sheath 21 of the delivery device 100, and the implant 200 can be delivered into a living body through the delivery device 100. Before the implant 200 is loaded into the delivery device 100 (i.e., when the delivery device 100 is in a natural state), the distal end face of the outer sheath 21 of the delivery device 100 abuts against the proximal end face of the TIP head 23, and the distal end face of the movable assembly 12 is separated from the proximal end face of the fixed assembly 11, so that a part of the movable member 122 is exposed outside the handheld portion 112. It should be understood that at this time, although the movable member is located in the inner cavity of the handheld portion, the distal end face of the movable member is also separated from the proximal end face of the handheld portion. When loading the implant 200, after the implant 200 is fixed on the delivery device 100, by operating the movable assembly 12, the outer sheath 21 is moved towards the distal end, so that the distal end face of the outer sheath 21 abuts against the proximal end face of the TIP head 23 to complete the loading of the implant 200. During the loading process, due to the radial expansion force of the implant 200 itself, the greater the loading force, the greater the resistance of the outer sheath 21 towards the proximal end by the implant 200. In the field of medical devices, the outer sheath 21 is usually made of a polymer material, so the outer sheath 21 will be shortened under the action of the loading resistance. Since in the natural state, the movable assembly and the fixed assembly of the delivery device are separated, a compressible stroke is reserved for the further movement after the outer sheath is shortened. Therefore, even when the operating portion 124 abuts against the movable member 122, the outer sheath 21 and the TIP head 23 are still in a separated state, and the operating portion 124 can still continue to move towards the distal end, pushing the movable member 122 to compress the elastic member 121, so that the outer sheath 21 continues to move towards the distal end until the distal end face of the outer sheath 21 abuts against the proximal end face of the TIP head 23.

[0051] To better show the positional relationship between the distal end of the outer sheath, the TIP head, and the implant, Figures 8 to 10 the distal end portion of the delivery system is enlarged in size.

[0052] It can be understood that since there are various sizes of implants, during loading, the outer sheath may be shortened or may not be shortened. When it is shortened, the shortened size will also vary depending on the size of the implant. Therefore, after the movable member further compresses the elastic member to compensate for the shortening distance of the outer sheath to complete the loading of the implant, the operating portion and the handheld portion may not be in contact, and the two may still be in a separated state.

[0053] Therefore, in this embodiment, by providing an elastic member and a movable member on the movable component, a compressible stroke is provided for the outer sheath tube, solving the problem that when loading an implant with the outer sheath tube of the delivery device, the outer sheath tube is shortened or the sheath core is elongated, resulting in the inability of the distal end of the outer sheath tube to close with the TIP head after loading the implant.

[0054] Embodiment Two

[0055] The delivery device of this embodiment is basically the same as that of Embodiment One, except for the control mechanism.

[0056] As Figure 11 and Figure 12 shown, the control mechanism of this embodiment does not have a mounting base. A plurality of ridges 318 are provided on the inner wall of the handheld portion 312. The annular ridge 315 on the distal end portion of the movable track 314 is in limit engagement with the ridge 318 on the handheld portion 312, thereby fixing the movable track 314 through the handheld portion 312, and a receiving portion 319 with an opening facing the proximal end is formed between the inner cavity of the handheld portion 312 and the distal end portion of the movable track 314. The elastic member 321 is disposed in the receiving portion 319, and the distal end of the elastic member 321 abuts against the ridge 318 on the inner wall of the handheld portion 312, thereby restricting the distal end of the elastic member 321 from further moving towards the distal end. The distal end portion of the movable member 322 is movably received in the receiving portion 319, and the proximal end of the movable member 322 can protrude from the proximal end of the receiving portion 319. In this embodiment, the first limiting member 317 is disposed on the inner wall of the handheld portion 312 (i.e., the inner wall of the receiving portion), and the second limiting member 323 is disposed on the outer surface of the movable member 322. Thus, the first limiting member 317 and the second limiting member 323 can move away from or close to each other under the action of an external force. It can be understood that the first limiting member can be a ridge provided on the handheld portion 312. The operation portion 324 is disposed near the proximal end of the movable member 322 and does not exceed the movable member when moving. The specific structure is similar to that of Embodiment One and will not be described in detail here.

[0057] It can be understood that the receiving portion of this embodiment can also be provided on the movable component. Specifically, the receiving portion can be provided at the distal end of the handheld portion, with the opening facing the distal end, while receiving the elastic member, and the movable member is also partially limited within the receiving portion. The specific structure of this part is the same as that of this embodiment, and only the corresponding structure needs to be adjusted to the operation portion.

[0058] The operation of loading the implant with the delivery device of this embodiment and the principle of compensating for the shortening of the outer sheath tube are the same as those of Embodiment One and will not be described in detail here.

[0059] The delivery device of this embodiment provides a compressible stroke for the outer sheath tube by arranging an elastic member and a movable member on the movable assembly, solving the problem that when loading an implant, the outer sheath tube of the delivery device is shortened or the sheath core is stretched, resulting in the inability to close the distal end of the outer sheath tube and the TIP head after loading the implant. In addition, the control mechanism has a more concise structure.

[0060] Embodiment III

[0061] The delivery device of this embodiment is basically the same as that of Embodiment I, except for the control mechanism, and no elastic member and movable member are provided in the control mechanism.

[0062] As Figure 13 shown, the control mechanism of this embodiment includes a fixed assembly and a movable assembly. Among them, the distal end portion of the movable assembly 424 includes a receiving portion 419 with an opening facing the distal end. The receiving portion 419 can receive the proximal end portion of the fixed assembly 412, that is, the inner cavity size of the receiving portion 419 is larger than the outer diameter of the proximal end portion of the fixed assembly 412. Preferably, the inner diameter of the receiving portion 419 is equal to the outer diameter of the proximal end portion of the fixed assembly 412. It can be understood that the inner diameter of the receiving portion can gradually increase from the proximal end to the distal end. Correspondingly, the outer diameter of the proximal end portion of the fixed assembly gradually decreases from the distal end to the proximal end.

[0063] It can be understood that in other embodiments, the receiving portion on the control mechanism and the received portion can be interchanged. As Figure 14 shown, the proximal end portion of the fixed assembly 512 is provided with a receiving portion 519 with an opening facing the proximal end. The receiving portion 519 can receive the distal end portion of the movable assembly 524. In addition, to make the outer diameter of the control mechanism transition naturally and limit the maximum distance of the relative movement of the movable assembly with respect to the fixed assembly, a stop position 526 is provided on the outer surface of the distal end portion of the movable assembly 524. The stop position 526 can be a stepped surface formed on the outer surface of the movable assembly 524. When the proximal end face of the receiving portion 519 abuts against the stop position 526, the movable assembly 524 cannot continue to move towards the fixed assembly 512.

[0064] It can also be understood that when the receiving portion is arranged at the distal end portion of the movable assembly, a stop position can also be provided on the outer surface of the fixed assembly.

[0065] Other structures of this embodiment are similar to those of Embodiment I and will not be elaborated here.

[0066] Before loading the implant using the delivery device of this embodiment, the proximal end face of the TIP head abuts against the distal end face of the outer sheath tube, and the receiving portion 419 only receives a small part of the proximal end portion of the fixed assembly 412. When loading the implant and the outer sheath tube is shortened, the movable assembly is continuously moved towards the distal end, so that the receiving portion receives more of the proximal end portion of the fixed assembly 412 to make up for the size of the shortening of the outer sheath tube and complete the loading of the implant.

[0067] The conveying device of this embodiment provides a compressible stroke for the outer sheath tube by arranging an elastic member and a movable member on the movable assembly, solving the problem that when loading the implant, the outer sheath tube of the conveying device is shortened or the sheath core is stretched, resulting in the inability to close the distal end of the outer sheath tube and the TIP head after loading the implant. In addition, the control mechanism has a more concise structure.

[0068] The above embodiments are only the preferred embodiments of the present invention. This specification cannot list all optional embodiments in detail. Those skilled in the art can split, combine or omit some structures of the above embodiments according to actual needs. Without changing the concept of the present invention, they all belong to the technical solutions covered by the present invention.

Claims

1. A delivery device, the delivery device comprising a catheter assembly and a control mechanism, the catheter assembly comprising an outer sheath tube and a sheath core, the control mechanism controlling the movement of the outer sheath tube, and a TIP head being provided at the distal end of the sheath core. Characterized in that the control mechanism comprises a fixed assembly and a movable assembly, the movable assembly being disposed near the proximal end of the fixed assembly, the proximal end portion of the outer sheath tube passing through the fixed assembly and then being connected to the movable assembly, and the outer sheath tube being movable relative to the fixed assembly under the control of the movable assembly. When the distal end face of the outer sheath tube abuts against the proximal end face of the TIP head, the distal end face of the movable assembly is separated from the proximal end face of the fixed assembly. After the implant is loaded into the outer sheath tube, the distal end face of the outer sheath tube abuts against the proximal end face of the TIP head, and the distance between the distal end face of the movable assembly and the proximal end face of the fixed assembly is shorter than the distance between the distal end face of the movable assembly and the proximal end face of the fixed assembly before loading the implant.

2. A delivery device, the delivery device comprising a catheter assembly and a control mechanism, the catheter assembly comprising an outer sheath tube and a sheath core, the control mechanism controlling the movement of the outer sheath tube, and a TIP head being provided at the distal end of the sheath core. Characterized in that the control mechanism comprises a fixed assembly and a movable assembly, the movable assembly being disposed near the proximal end of the fixed assembly, the proximal end portion of the outer sheath tube passing through the fixed assembly and then being connected to the movable assembly, and the outer sheath tube being movable relative to the fixed assembly under the control of the movable assembly. When the distal end face of the outer sheath tube abuts against the proximal end face of the TIP head, the distal end face of the movable assembly is separated from the proximal end face of the fixed assembly. The proximal end portion of the fixed assembly comprises a receiving portion with an opening facing the proximal end, and the receiving portion can receive the distal end portion of the fixed assembly; or the distal end portion of the movable assembly comprises a receiving portion with an opening facing the distal end, and the receiving portion can receive the proximal end portion of the fixed assembly.

3. The delivery device according to claim 2, Characterized in that a stop position is provided on the outer surface of the distal end portion of the movable assembly or the outer surface of the proximal end portion of the fixed assembly. When the end face of the receiving portion near the stop position abuts against the stop position, the movable assembly has no axial movement relative to the fixed assembly.

4. The delivery device according to claim 1 or 2, Characterized in that the movable assembly comprises an elastic member and a movable member, the proximal end of the fixed assembly comprises a receiving portion with an opening facing the proximal end or the distal end of the movable assembly comprises a receiving portion with an opening facing the distal end, the elastic member is disposed in the inner cavity of the receiving portion, the movable member is disposed near the elastic member, and at least part of the movable member is received by the receiving portion and is movably connected to the receiving portion, such that the elastic member is in a compressed state.

5. The delivery device according to claim 1 or 2, Characterized in that The proximal end of the fixed component includes a receiving portion with an opening facing the proximal end, or the distal end of the movable component includes a receiving portion with an opening facing the distal end. A first limiting member is provided on the inner wall of the receiving portion, and a second limiting member is provided on the movable component. When the first limiting member contacts the second limiting member, the movable component is restricted from moving away from the receiving portion.

6. The conveying device according to claim 5, wherein, the movable component includes an elastic member and a movable member. The elastic member is disposed in the inner cavity of the receiving portion. The movable member is disposed close to the elastic member, and at least a part of the movable member is received by the receiving portion and is movably connected to the receiving portion, so that the elastic member is in a compressed state; the second limiting member is disposed on the movable member. When the movable member moves towards the bottom surface of the inner cavity of the receiving portion, the elastic member is compressed and the first limiting member is separated from the second limiting member.

7. The conveying device according to claim 1 or 2, wherein, the fixed component further includes a movable track, and the movable component includes an operating portion. The operating portion has an inner cavity, the movable track passes through the inner cavity of the operating portion, and the operating portion can axially move relative to the fixed component along the movable track.

8. The conveying device according to claim 7, wherein, the proximal end of the fixed component includes a receiving portion with an opening facing the proximal end, or the distal end of the movable component includes a receiving portion with an opening facing the distal end; a first limiting member is provided on the inner wall of the receiving portion, and a second limiting member is provided on the movable component. When the first limiting member contacts the second limiting member, the movable component is restricted from moving away from the receiving portion; when the first limiting member is separated from the second limiting member, the operating portion further moves towards the distal end.

9. A conveying system, wherein, it includes an implant and the conveying device according to any one of claims 1 to 8, and the implant can be loaded into the outer sheath tube of the conveying device.

Images