Implant delivery device, inner tube assembly, and catheter

Abstract

The present invention discloses an implant delivery device, an inner tube assembly, and a catheter. The inner tube assembly includes an implant protection component, an inner tube, and a fixing head connected to the inner tube. The implant protection component is connected to the inner tube and / or the fixing head. The implant protection component is configured to contact the implant to support the implant. The protection body is in the form of a circular ring or circular arc. The implant delivery device provided by the present invention, by providing the implant protection component, can support non-anchor rods of a valve stent with relatively weak circumferential support force, thereby preventing the valve stent from tilting or being damaged during loading, and from twisting or collapsing during release.

Description

Technical Field

[0001] The present invention relates to an implant delivery system, in particular to an implant delivery device and an inner tube component and a catheter thereof. Background Art

[0002] Implants, such as self-expanding stents, require specific structures to secure them to corresponding structures on the delivery system during loading and release, either through form-fitting or pull-wire mechanisms. This can be done at one or both ends, ensuring stable grip and release of the implant by the delivery system. These specific structures on the implant are called hooks, and the corresponding structures on the delivery system are called fixation heads. Hooks can appear at any node on the stent. For single-layer stents, they are typically located at one end; for double-layer stents, they are typically located at one end of the inner or outer stent layer. However, after crimping, hooks are not necessarily located at the top of the stent. Hooks can be located at all nodes around the stent end, or only at some nodes. The remaining nodes without hooks are referred to as non-hook rods. Depending on whether hooks are installed at the nodes, rods with hooks are referred to as anchor rods, while rods without hooks are referred to as non-anchor rods. In double-layer stents, the anchor and non-anchor rods may reside in different layers.

[0003] The problem with the existing delivery system is that when the valve stent is a circumferentially symmetrical stent, the number of shape-fitting or pull-wire nodes on the fixing head will in most cases be less than the number of nodes corresponding to the anchor rod on the stent. Then, during the loading process, the lug is tightly combined in the groove, and the anchor rod is subjected to the compression force of the sheath / loading tool and the support force of the fixing head, while the non-anchor rod is only subjected to the compression force. In addition, due to the existence of axial height differences, that is, the height difference formed by the height of the lug itself or the notch at the end of the stent body, the forces on the anchor rod and the non-anchor rod are often inconsistent, which in turn causes the non-anchor rod to easily retract inward during the loading and release process. The stent directly applies force to the leaflets, which can easily cause damage to the leaflets and affect the function of the prosthesis. In addition, the implant is subjected to uneven force, which can cause the implant to tilt, be damaged, or even fail to load or become unusable. The above phenomenon will be more serious when the valve stent is designed to be non-circumferentially symmetrical. For example, the rigidity of a certain area of the stent is less than that of other areas, or the gap is set asymmetrically, which will cause the valve stent to be unevenly stressed and more likely to tilt, twist, or be damaged during the loading and release process, thereby causing loading failure or the implant to be unusable.

[0004] Common fixation heads are typically truncated cones or wedges with grooves. The lugs on the implant match the grooves, forming a form-fitting connection. In clinical applications, the current implant loading process involves partially crimping the implant, securing the lugs in the grooves of the fixation head, and then driving the catheter forward to gradually enclose the implant. During the loading process, particularly for circumferentially asymmetric stents, poor force uniformity can easily lead to implant tilt and damage. The high support force, short axial height, and circumferential asymmetry of self-expanding stents exacerbate this problem. Furthermore, during the release process, the implant may twist, collapse, become damaged, or even become inoperable. Furthermore, if one end face of the leaflet of a self-expanding stent is at the same height as, or close to, the stent end face, the stent can compress the leaflet during loading and release, causing damage and compromising its usability. Prior art approaches typically involve improvements to the delivery catheter, implant, or loading tool, resulting in complex, time-consuming, and costly solutions. The role of the fixation head is often overlooked.

[0005] Therefore, it is necessary to develop a new implant delivery device and an inner tube assembly thereof to solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an implant delivery device and its inner tube assembly and catheter, which can provide support force for the implant and prevent the implant from collapsing during the delivery process.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is to provide an inner tube assembly for conveying an implant, wherein the inner tube assembly includes an implant protection component, an inner tube and a fixing head connected to the inner tube, the implant protection component is connected to the inner tube and / or the fixing head, and the implant protection component is used to be arranged in contact with the implant to support the implant.

[0008] Preferably, the implant protection component includes at least one protection body, and the protection body is in the shape of a circular ring sheet or a circular arc sheet.

[0009] Preferably, the implant protection component is connected to the inner tube, and the implant protection component includes a connector and a protection body, the connector is connected to the inner tube, and the protection body is connected to the connector.

[0010] Preferably, the fixing head has a groove, and the groove is arranged opposite to the protecting body in the axial direction.

[0011] Preferably, the implant protection component includes a first protection body and a second protection body connected to each other, the second protection body is connected to the first protection body, and one of the first protection body and the second protection body is connected to the fixing head.

[0012] Preferably, the inner tube assembly includes a first implant protection component and a second implant protection component, the first implant protection component is connected to the fixing head, and the first implant protection component has a first protective body; the second implant protection component is connected to the inner tube, the second implant protection component includes a connecting piece and a second protective body, the connecting piece is connected to the inner tube, and the second protective body is connected to the connecting piece; and the first protective body and the second protective body are arranged opposite to each other in the axial direction.

[0013] Preferably, the connecting member is a cylinder with a hole in the middle, and the connecting member is circumferentially connected to the inner tube at the hole.

[0014] Preferably, the first protective body is in the shape of a circular ring sheet, and the second protective body is in the shape of a circular arc sheet.

[0015] Preferably, a gap is formed between the implant protection component and the inner tube.

[0016] Another technical solution adopted by the present invention to solve the above technical problem is to provide a catheter for delivering an implant, comprising an outer tube and the inner tube assembly, wherein the inner tube assembly is inserted into the outer tube.

[0017] Another technical solution adopted by the present invention to solve the above technical problems is to provide an implant delivery device, including a handle, an outer tube and the above-mentioned inner tube assembly, the inner tube assembly is inserted into the outer tube, and the handle is used to drive the outer tube to move axially relative to the inner tube assembly.

[0018] Compared to the prior art, the present invention has the following beneficial effects: The implant delivery device and its inner tube assembly and catheter provided by the present invention, by providing an implant protection component on the fixed head or inner tube, can support areas of the valve stent with weak circumferential support force, such as non-anchoring rods and notches, thereby preventing the valve stent from tilting or being damaged during loading and twisting or collapsing during release. In particular, a radially hollowed internal space is formed between the implant protection component and the inner tube, and the hollowed internal space can be used to accommodate the valve leaflets. Therefore, the implant protection component separates the valve stent and the valve leaflets, effectively protecting the valve leaflets and avoiding squeezing of the valve leaflets. This effectively solves the problem of the stent squeezing the valve leaflets during loading and release, and ensures the fatigue performance of the valve leaflets. When the protective body is made of a soft material, the soft material can provide a certain degree of support while further reducing damage to the stent or valve. With the development of stent research technology, stents with notches or other types of irregularities designed according to the original physiological structure of the heart will become more and more common, and the application range of the implant protection component will become increasingly broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1aThis is a schematic structural diagram of an implant delivery device according to an embodiment of the present invention. Figure 1b This is a schematic structural diagram of the inner tube assembly of the implant delivery device according to an embodiment of the present invention. Figure 1c is a cross-sectional schematic diagram of an inner tube assembly of an implant delivery device according to an embodiment of the present invention;

[0020] Figure 2a 、 2b 2c and 2d are schematic diagrams of various shapes of the protective body in the embodiment of the present invention;

[0021] Figure 3a 、 3b 3c, 3d, and 3e are schematic cross-sectional views obtained by bisecting the cross section of the catheter in an embodiment of the present invention;

[0022] Figure 4a 、 4b 4c is a schematic diagram of the distribution of the protection body in the embodiment of the present invention, wherein Figure 4b 、 Figure 4c Schematic diagram of symmetrical arrangement of multiple protection bodies;

[0023] Figure 5 A schematic diagram of an asymmetrical arrangement of multiple protective bodies of an implant delivery device according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the connection between the implant protection component and the inner tube in an embodiment of the present invention;

[0025] Figure 7 This is a schematic structural diagram of the connection between the implant protection component and the fixing head in an embodiment of the present invention;

[0026] Figure 8 This is a schematic structural diagram of two implant protection components connected to the inner tube and the fixing head respectively in an embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the structure in which the stent is compressed until the sheath contacts the implant protection component in an embodiment of the present invention.

[0028] Figure 10a 、 10b 10c are schematic diagrams of the structure in which a notch is provided at the end of the stent, a notch is provided in the middle, and the inflow channel is asymmetrically arranged in an embodiment of the present invention.

[0029] In the picture:

[0030] 1 Implant protection component 2 Fixing head 3 Inner tube 4 Conical head

[0031] 1a First implant protection component 1b Second implant protection component

[0032] 11, 11a, 11b Protective body 111 First protective body

[0033] 112 second protective body 12 connecting piece

[0034] 21 ear-hanging groove 22 base 31 proximal inner tube

[0035] 32 distal inner tube 5 stent 6 sheath 7 gap

[0036] 8 hanging ears 901 inflow channel 902 transition section 903 outflow channel

[0037] 9011 special-shaped area 51 non-anchor rod 52 anchor rod

[0038] 100 catheter 200 handle DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and examples.

[0040] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the present invention can be practiced without these specific details. Therefore, the specific details set forth are merely exemplary, and the specific details may be varied within the spirit and scope of the present invention and still be considered to be within the spirit and scope of the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly fixed to the other element or an intermediate element may exist, that is, one element is indirectly fixed to the other element through the intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or an intermediate element may exist at the same time, that is, one element is indirectly connected to the other element through the intermediate element. In order to more clearly describe the structural features of the present invention, "proximal end", "distal end" and "axial end" are used as directional words, where "proximal end" refers to the end close to the operator during surgery; "distal end" refers to the end away from the operator, and axial end refers to the direction of the axis of the inner tube. The term "or" is generally used in a sense that includes "and / or" unless the content clearly indicates otherwise.

[0042] The implant in this embodiment is described using a valve stent as an example. The present invention provides an implant delivery device, inner tube assembly, and catheter, each of which includes an implant protection component on the fixed head and / or inner tube to prevent the valve stent from tilting or being damaged during loading, and from twisting or collapsing during release.

[0043] Figure 1a The figure is a schematic diagram of the structure of an implant delivery device. Figure 1a As shown, an implant delivery device can be used to carry valve prostheses to perform operations such as loading, delivering, releasing, and recovering artificial heart valves (such as artificial aortic valves). The above-mentioned device may include a catheter 100 and a control handle 200 connected to the proximal end of the catheter 100; the above-mentioned catheter 100 may include an outer tube and an inner tube assembly that are sequentially connected.

[0044] See Figure 1b and Figure 1c The inner tube assembly for delivering an implant provided in this embodiment includes an implant protection component 1, a fixed head 2, an inner tube 3 and a conical head 4. The fixed head 2 and the conical head 4 are both connected to the inner tube 3. The inner tube 3 includes a proximal inner tube 31 and a distal inner tube 32. The proximal inner tube 31, the fixed head 2, the distal inner tube 32 and the conical head 4 are connected in sequence from the proximal end to the distal end. The inner tube 3 has a through lumen for a guide wire to pass through. In a specific embodiment, the implant protection component 1 can be connected to the fixed head 2, or fixedly connected to the inner tube 3. The fixing method can be an integral connection or connection by welding, adhesion, etc. This embodiment does not impose any special restrictions on the connection method. The implant protection component 1 is mainly used to contact the non-anchoring rod of the valve stent in the pressed and gripped state to play a supporting role. In the conveying system, the number of fixed heads 2 can be one or more. It can be understood that those skilled in the art can set the implant protection component 1 according to the support force requirements of the stent end, and choose to set the implant protection component 1 on one fixed head, multiple fixed heads, inner tube, or on the fixed head and inner tube at the same time. The number of implant protection components 1 can be set to one or more depending on the setting position.

[0045] The implant protection component 1 includes at least one protection body 11. In the embodiment of the present invention, the protection body 11 is in the shape of a circular ring or an arc. The protection body 11 is in the shape of a circular ring, which means that the projection of the protection body 11 in the circumferential direction is a circular ring. Figure 7 The second protective body 112 in the embodiment. The protective body 11 is in the shape of an arc sheet, which means that the projection of the protective body 11 in the circumferential direction is in the shape of an arc. Figure 4a-4c 、 Figure 5 shown.

[0046] The protective body 11 can have various shapes, and its planar shape after being unfolded along the circumferential direction is as follows: Figures 2a-2d As shown, of course the protection body 11 is not limited to Figures 2a-2d The axial length and radial width of the four shapes shown are determined according to the position and structure of the non-anchoring rod of the valve stent that they need to support. It is sufficient to ensure that the protective body 11 is in contact with the non-anchoring rod at the top of the valve stent frame to provide support force and avoid the collapse of the stent. This structure is particularly suitable for the loading and release of a valve stent with an incompletely symmetrical structure at the top of the stent frame, such as a notched structure.

[0047] The arrangement of the implant protection component 1 is described by the two-dimensional plane of the basic unit on which the protection body 11 constituting the implant protection component 1 falls. The basic unit is a cross-sectional view obtained by bisecting the cross section of the catheter, preferably 1-8 basic units; more preferably 2-6 basic units, such as Figures 3a-3e shown.

[0048] The protection body 11 can be arranged in a basic unit, such as Figure 4a As shown; it can also be set in multiple basic units, such as Figure 4b and 4c As shown. The shapes of the protection bodies 11 in different basic units can be the same or different. When the protection bodies 11 are set in different basic units, they can be set symmetrically or asymmetrically. Figure 4b The two protective bodies 11, Figure 4c The three protection bodies 11 are all symmetrically arranged; the asymmetric arrangement is mainly aimed at the asymmetric end of the valve stent body.

[0049] Two or more protection bodies 11 may also be provided in one basic unit. Figure 5 As shown, it includes two protection bodies 11a and 11b. Of course, the shapes of the protection bodies 11 provided in different basic units can be the same or different.

[0050] See Figure 6In one embodiment, the implant protection component 1 is connected to the inner tube 3. The implant protection component 1 includes a connector 12 and a protection body 11. In a preferred embodiment, the connector 12 is a cylinder with a hole in the middle. The connector 12 is circumferentially connected to the inner tube 3 at the hole and is coaxially arranged with the inner tube 3. The protection body 11 is connected to the connector 12. The shape of the connector 12 is not particularly limited in the present invention, as long as the protection body 11 can be connected to the position on the bracket that needs to be fixed and supported and the size does not affect the loading, release and other operations of the bracket; preferably, the groove on the fixing head 2 21 and the protective body 11 are arranged relative to each other in the axial direction, that is, the opening direction of the groove 21 is opposite to the axial setting direction of the protective body 11 on the connecting piece 12. This setting can be applied to the bracket with the ear and the notch at different ends, so that the ear at one end of the bracket is matched with the groove 21, and the notch at the other end of the bracket is matched with the protective body 11. When the ear and the notch are at different ends of the bracket, the bracket is more likely to twist or sink in. Therefore, the implant protection component 1 is set on the inner tube 3. By providing support force at the notch, the bracket can be effectively prevented from twisting or sinking in. When the implant protection component 1 is connected to the inner tube 3, its number can be one or more, more preferably 1 or 2. The way it is arranged on the inner tube 3 is determined according to the position of the stent with weaker circumferential support force that needs to be covered when the stent is pressed, such as the non-anchor rod position. That is, relative to the fixed head 2, the protection body 11 can be arranged on both sides of the fixed head 2. At this time, at least 2 protection bodies 11 are required; at least 2 protection bodies 11 can also be arranged on one side of the fixed head 2, so that it can cover the position of the stent with weaker circumferential support force. Taking the stent with a notch as an example, the protection body 11 covers the non-anchor rod where the notch is located.

[0051] In another embodiment, the implant protection component 1 and the fixing head 2 are directly connected, as shown in FIG1 and FIG2 . Figure 7 As shown; the fixing head 2 includes a base 22 and a groove 21, the base 22 is connected to the implant protection member 1, the implant protection member 1 shown in Figure 1 includes a plurality of arc-shaped sheet protection bodies 11; as Figure 7 The implant protection component 1 shown comprises a first protective body 111 and a second protective body 112 connected to each other. Preferably, there are one or more first protective bodies 111 in the form of circular arc sheets; there is one second protective body 112 in the form of a circular ring sheet. The second protective body 112 is connected to the fixing head 2, and the first and second protective bodies 111 and 112 are connected. This structure can be applied to the loading and release of valve stents with the ear and notch at the same end. It can simultaneously provide support for the notch and non-anchoring rod, which facilitates uniform stress distribution on the stent.

[0052] In yet another embodiment, see Figure 8The inner tube assembly includes a first implant protection component 1a and a second implant protection component 1b. Preferably, the second implant protection component 1b has a second protection body 112, which is in the shape of a circular ring sheet and is connected to the fixed head 2. The first implant protection component 1a includes a connector 12 and at least one first protection body 111. The connector 12 is connected to the inner tube 3. The connector 12 is preferably a cylinder with a hole in the middle. The connector 12 is circumferentially connected to the inner tube 3 at the hole and is coaxially arranged with the inner tube 3. The first implant protection component 1a is connected to the connector 12. The first protection body 111 is in the shape of a circular arc sheet. The first protection body 111 and the second protection body 112 are arranged opposite to each other in the axial direction, that is, the axial setting direction of the first protection body 111 on the connector 12 is opposite to the axial setting direction of the second protection body 112 on the fixed head 2. The inner tube assembly of this structure can simultaneously provide support force to the non-anchor rods at both ends of the stent, which is more conducive to uniform force on the stent.

[0053] In the present invention, the implant protection component 1 contacts one end of the stent frame, allowing a portion of the implant protection component 1 to axially overlap the valve stent, thereby supporting the valve stent. The axial length of the overlapping contact surface between the implant protection component 1 and the stent is determined by the location of the non-anchoring rods of the stent, preferably covering a length of less than 5 mm, and more preferably 1-2 mm.

[0054] The material of the implant protection component 1 is not limited, and can be a relatively hard metal material or a soft material. While the soft material provides a certain support force for the stent, it can also further reduce damage to the valve stent or valve.

[0055] Preferably, the protective body 11 is in the form of a thin sheet, and a hollow internal space is formed radially between the protective body and the inner tube, that is, a gap is formed between the protective body and the inner tube, and the hollow internal space can be used to accommodate the valve leaflets. The prosthetic protective component 1 separates the valve support and the valve leaflets, which can protect the valve leaflets, prevent the valve leaflets from being squeezed and damaged, and ensure the fatigue performance of the valve leaflets. Figure 9The valve stent 5 includes a non-anchoring rod 51 and an anchoring rod 52. During the loading process, the stent 5 subjected to the compressive gripping force may squeeze the internal leaflets, and the implant protection component 1 prevents the inward movement of the non-anchoring rod 51. During the release process, in the prior art, the non-anchoring rod 51 still in the sheath 6 will be deformed due to the outward supporting force of the stent rod outside the sheath 6, and then will be retracted toward the inside of the stent, squeezing the leaflets, while the implant protection component 1 provides support for the non-anchoring rod 51 in the sheath 6, avoiding squeezing of the leaflets. When the stent is provided with a free skirt facing the axial direction of the stent, the gap formed between the implant protection unit and the inner tube can also be used to place the free skirt, avoiding squeezing of the free skirt; when the stent is a double-layer stent, the gap can also be used to place the inner layer of the double-layer stent, avoiding squeezing of the inner layer. When loading or releasing the stent, a gap is formed between the protective body and the inner tube, and the protective body also plays a certain buffering role, which is more conducive to the smooth compression or release of the stent.

[0056] Figure 10a A mitral valve replacement stent is shown. The stent's main structure includes a hook 8, an inflow channel 901, a transition section 902, an outflow channel 903, and a notch 7. The notch 7 and the hook 8 are respectively provided at each end of the stent. The stent has a short axial height and a notch. This stent has poor force uniformity during loading, making it very prone to tilting, twisting, collapse, and even damage. When an implant protection component 1 is provided on the inner tube assembly of the delivery system at a position corresponding to notch 7, the mesh at notch 7 contacts the implant protection component 1 during loading, ensuring balanced force on the stent's outflow channel 903 and preventing the stent from tilting, twisting, and collapse.

[0057] Figure 10b Another type of stent is shown, in which a notch 7 is provided in the middle of the main structure of the stent, and an implant protection component 1 can be provided at a position corresponding to the notch 7 on the inner tube assembly of the conveying system. The implant protection component 1 contacts at least part of the grid around the notch to provide support force, thereby ensuring that the stent is subjected to balanced force and avoiding the occurrence of tilting, twisting, collapse, etc. of the stent.

[0058] Figure 10c A top view of another stent is shown, showing an asymmetrical inflow channel 901 having a profiled region 9011. An implant protection component 1 is positioned on the inner tube assembly of the delivery system at a location corresponding to profiled region 9011. Implant protection component 1 contacts profiled region 9011, ensuring balanced force distribution across inflow channel 901 and preventing stent tilting, twisting, or collapse.

[0059] Therefore, the implant delivery device provided in this embodiment provides an implant protection component 1 on its inner tube assembly, wherein the protection body 11 solves the problem of poor force uniformity caused by the large support force, short axial height, and asymmetry of the self-expanding stent, thereby achieving high-quality release of the artificial valve at the lesion site. The present invention is also applicable when the stent is a circumferentially asymmetric stent, for example, the rigidity of a certain area of the stent is less than that of other areas, or the notch is asymmetrically arranged, which causes the stent to be unevenly stressed and more likely to tilt, twist, or be damaged during the loading and release process, thereby causing loading failure or the implant to be unusable; by providing a protection body on the inner tube assembly corresponding to this area, it is possible to provide support force to the stent and ensure its loading and release. Furthermore, with the diversification of stent types, such as split stents, the requirements for support force of each part of the stent are also different, and different implant protection components can also be selected according to the needs of each part.

[0060] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. An inner tube assembly for delivering an implant, wherein the implant is a valve prosthesis, comprising a valve stent and a valve leaflet, characterized in that: The inner tube assembly includes an implant protection component, an inner tube and a fixing head connected to the inner tube. The implant protection component is connected to the inner tube and / or the fixing head. The implant protection component is used to be arranged in contact with the implant to support the implant. The implant protection component includes at least one protective body, which is in the shape of a circular ring sheet or a circular arc sheet. A gap is formed between the implant protection component and the inner tube, which can be used to accommodate the leaflets. The implant protection component separates the valve support and the leaflets.

2. The inner tube assembly according to claim 1, wherein: The implant protection component is connected to the inner tube, and the implant protection component includes a connector and a protection body. The connector is connected to the inner tube, and the protection body is connected to the connector.

3. The inner tube assembly according to claim 2, wherein: The fixing head has a groove, and the groove is arranged opposite to the protecting body in the axial direction.

4. The inner tube assembly according to claim 1, wherein The implant protection component includes a first protection body and a second protection body connected to each other, and one of the first protection body and the second protection body is connected to the fixing head.

5. The inner tube assembly according to claim 1, wherein: The inner tube assembly includes a first implant protection component and a second implant protection component, the first implant protection component is connected to the fixing head, and the first implant protection component has a first protective body; the second implant protection component is connected to the inner tube, and the second implant protection component includes a connecting piece and a second protective body, the connecting piece is connected to the inner tube, and the second protective body is connected to the connecting piece; and the first protective body and the second protective body are arranged opposite to each other in the axial direction.

6. The inner tube assembly according to claim 2 or 5, characterized in that: The connecting piece is a cylinder with a hole in the middle, and the connecting piece is circumferentially connected to the inner tube at the hole.

7. The inner tube assembly according to claim 4 or 5, characterized in that: The first protective body is in the shape of a circular ring sheet, and the second protective body is in the shape of a circular arc sheet.

8. A catheter for delivering an implant, characterized in that: It comprises an outer tube and the inner tube assembly according to any one of claims 1 to 7, wherein the inner tube assembly is inserted into the outer tube.

9. An implant delivery device, characterized in that: It comprises a handle, an outer tube and the inner tube assembly according to any one of claims 1 to 7, wherein the inner tube assembly is passed through the outer tube, and the handle is used to drive the outer tube to perform axial movement relative to the inner tube assembly.

Images