Delivery catheter for implant delivery device and implant delivery device

Abstract

The invention relates to a delivery catheter for an implant delivery device, a pointed end comprises a conical body and a connecting body which are independent from each other, the connecting body can be partially embedded into the conical body, and the connecting body serves as a far-end connecting piece; the inner pipe penetrates through the connector and is connected with the cone-shaped body; the inner tube is sleeved with the middle-layer tube in a sliding mode, the middle-layer tube is fixedly connected with the connecting body, and the middle-layer tube is fixed to the implant conveying device; the middle-layer tube is sleeved with the near-end connecting piece in a sliding mode. The outer tube sleeves the near-end connecting piece in a sliding manner; the long loading tube is connected with the outer tube so as to cover the near-end connecting piece; the short loading tube is connected with the conical body to cover the far-end connecting piece, and the short loading tube and the long loading tube are in butt joint or sleeved connection together. On one hand, the positioning of the implant can be finely adjusted, and on the other hand, when the implant is completely released, the axial shrinkage is small, and the positioning of the implant is more accurate. The release controllability is better, and forward jumping is not prone to occurring. Meanwhile, the implant is released in the middle and restrained at the two ends, the implant is not fully expanded, and recovery is more convenient.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a delivery catheter for an implant delivery device and an implant delivery device. Background Art

[0002] Existing delivery catheters of implant delivery systems, such as Figure 1 As shown, it includes a pointed end 3, an inner tube 1, a proximal connector 4, an outer tube 5, and an integral loading tube 14. The inner tube 1 is provided with a proximal connector 4, and the outer tube 5 is connected to the integral loading tube 14. When loading, the outer tube 5 drives the integral loading tube 14 to move synchronously, and the proximal end 10 of the self-expanding valve stent 9 after being pressed and gripped is engaged with the proximal connector 4, and then the outer tube 5 is moved in the opposite direction, so that the proximal connector 4 gradually enters the integral loading tube 14, thereby shrinking and loading the self-expanding valve stent 14 into the integral loading tube 14. On the contrary, by opening the integral loading tube 14, the distal end 11 of the self-expanding valve stent 9 is first exposed from the integral loading tube 14, until the proximal connector 4 is exposed from the integral loading tube 14, the proximal end 10 of the self-expanding valve stent 9 is separated from the proximal connector 4, and the self-expanding valve stent 9 is released.

[0003] At the moment when the proximal end 10 of the self-expanding valve stent 9 is separated from the proximal connector 4, the diameter of the entire self-expanding valve stent 9 increases instantly because there is no constraint of the proximal connector 4 on the self-expanding valve stent 9. The diameter of the entire self-expanding valve stent 9 changes from about 10 mm to nearly 30 mm, and a "ejection" phenomenon occurs. It can also be understood that the entire self-expanding valve stent 9 will produce a forward jump, which is very unfavorable for ensuring the accuracy of the release position of the self-expanding valve stent 9.

[0004] In addition, the above structure only constrains the proximal end 10 of the self-expanding valve stent 9, and the distal end 11 of the self-expanding valve stent 9 is not constrained. When the self-expanding valve stent 9 is released, once the distal end 11 of the self-expanding valve stent 9 is exposed from the integral loading tube 14, the diameter of the distal end 11 of the self-expanding valve stent 9 will instantly increase, completing the automatic expansion and deployment of the distal end 11 of the self-expanding valve stent 9. When performing the recovery action, the diameter size of the distal end 11 of the self-expanding valve stent 9 that is automatically expanded and deployed is too different from that of the integral loading tube 14, and the distal end of the self-expanding valve stent 9 cannot enter the integral loading tube 14, resulting in the inability to recover. Summary of the invention

[0005] The purpose of this patent is to provide a delivery catheter and an implant delivery device for an implant delivery device to overcome the above-mentioned existing defects.

[0006] In order to achieve the above-mentioned purpose of this patent, the following technical solutions are adopted:

[0007] In a first aspect, the present application provides a delivery catheter for an implant delivery device, comprising an inner tube, a middle layer tube, a pointed tip, a proximal connector, an outer tube, a long loading tube, and a short loading tube;

[0008] The pointed tip includes a cone and a connecting body that are independent of each other. The connecting body can be partially embedded into the cone, and the connecting body serves as a distal connector;

[0009] The inner tube passes through the connecting body and is connected to the cone;

[0010] The middle layer tube is slidably sleeved on the inner tube and fixedly connected to the connecting body. The middle layer tube is fixed to the implant delivery device;

[0011] The proximal connector is slidably sleeved on the middle layer tube;

[0012] The outer tube is slidably sleeved on the proximal connector;

[0013] The long loading tube is connected to the outer tube to cover the proximal connector;

[0014] The short loading tube is connected to the cone to cover the distal connector. The short loading tube is docked or sleeved with the long loading tube.

[0015] Further, a receiving groove is provided in the cone. The receiving groove penetrates through the large-diameter end of the cone and is communicated with the outside. A protruding portion is provided on the connecting body, and the protruding portion can be embedded into the receiving groove.

[0016] Further, the proximal connector includes a support tube and a proximal connection seat. The support tube is slidably sleeved on the middle layer tube, and the proximal connection seat is slidably mounted on the support tube. A plurality of clamping grooves are provided on the side wall of the proximal connection seat for clamping and restraining the proximal end of the implant, or,

[0017] The proximal connector includes a support tube and a proximal connection seat. The support tube is sleeved on the middle layer tube, and the proximal connection seat is fixedly connected to the distal end of the support tube. A plurality of clamping grooves are provided on the side wall of the proximal connection seat for clamping and restraining the proximal end of the implant.

[0018] Further, the connecting body includes a distal connection seat. A plurality of clamping grooves are provided on the side wall of the distal connection seat for clamping and restraining the distal end of the implant.

[0019] Further, a distal limiting step is provided at the distal end of the support tube to prevent the proximal connection seat from detaching from the support tube.

[0020] Further, a guide wire channel is provided in the lumen of the inner tube, an axial channel communicating with the receiving groove is provided in the cone, and the axial channel is communicated with the guide wire channel.

[0021] Further, the proximal end of the proximal connecting seat is a conical head, and the large diameter end of the conical head faces the cone.

[0022] Further, the proximal end of the distal connecting seat is a conical head, and the large diameter end of the conical head faces the cone.

[0023] Further, the inner tube is made of metal or polymer material.

[0024] In a second aspect, the present application provides an implant delivery device, including a handle and the delivery catheter for the implant delivery device according to any one of the above;

[0025] The handle includes a control mechanism, and the control mechanism is operably connected to the outer tube to manipulate the outer tube. When the outer tube drives the long loading tube to move along the axial direction, the proximal connecting member can be exposed or retracted from the long loading tube;

[0026] The middle tube is fixed within the handle;

[0027] A first tail handle and a second tail handle are slidably mounted on the handle. Both the first tail handle and the second tail handle can slide along the axial direction on the handle and can be locked in position on the handle;

[0028] The first tail handle is connected to the proximal connecting member. Thus, when the proximal connecting member is driven to move along the axial direction by the first tail handle, the relative positional relationship between the proximal connecting member and the long loading tube can be changed to realize the recovery of the implant;

[0029] The second tail handle is connected to the inner tube. Thus, when the inner tube is driven by the second tail handle, the inner tube drives the cone, and the cone drives the short loading tube to move along the axial direction, the distal connecting member can be exposed or retracted from the short loading tube.

[0030] Adopting the above technical solutions, the present patent has the following beneficial effects:

[0031] 1. First, release the middle section of the implant. Only a small part of the distal and proximal ends of the implant are constrained. At this time, the whole implant is in a semi-released state. On the one hand, the position of the implant can be finely adjusted. On the other hand, when the implant is fully released, the shortening of the implant is small, and the positioning of the implant will be more accurate.

[0032] 2. In the semi-released state of the implant, a step-by-step release is adopted. The distal end of the implant is released first, and then the proximal end is released. The controllability of the release is better, and it is not easy to jump forward.

[0033] 3. The proximal and distal ends of the implant are respectively constrained, and the implant cannot fully expand, which is more convenient for recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present patent or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present patent. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the delivery catheter of the existing implant delivery system;

[0036] Figure 2 It is an exploded view of the structure of the delivery catheter of the implant delivery device according to Embodiment 1 and Embodiment 2 of the present application;

[0037] Figure 3 It is a schematic diagram of the connection relationship among the pointed end, the middle layer tube, and the proximal connector according to Embodiment 1 of the present application;

[0038] Figure 4 It is a schematic structural diagram of the self-expanding valve stent in the loaded state according to Embodiment 1 of the present application;

[0039] Figure 5 It is Figure 4 A schematic diagram of the structure with the self-expanding valve stent hidden;

[0040] Figure 6 It is a schematic structural diagram of the self-expanding valve stent in the released state according to Embodiment 1 of the present application;

[0041] Figure 7 It is a schematic diagram of the connection relationship among the pointed end, the middle layer tube, and the proximal connector according to Embodiment 2 of the present application;

[0042] Figure 8 It is a schematic structural diagram of the self-expanding valve stent in the loaded state according to Embodiment 2 of the present application;

[0043] Figure 9 It is Figure 8 A schematic diagram of the structure with the self-expanding valve stent hidden;

[0044] Figure 10 It is a schematic structural diagram of the self-expanding valve stent in the released state according to Embodiment 2 of the present application;

[0045] Figure 11Schematic structural diagram of the implant delivery device provided in Embodiment 3 of the present application.

[0046] Reference numerals: 1 - inner tube; 2 - middle layer tube; 3 - pointed end; 4 - proximal connector; 5 - outer tube; 6 - long loading tube; 7 - short loading tube; 31 - cone body; 32 - connecting body; 8 - distal connector; 9 - self-expanding valve stent; 10 - proximal end; 11 - distal end; 311 - receiving groove; 321 - protruding portion; 41 - support tube; 42 - proximal connection seat; 12 - card slot; 322 - distal connection seat; 13 - tapered head; 312 - axial channel; 14 - integral loading tube; 411 - distal limit step; 15 - handle; 16 - first tail handle; 17 - second tail handle; 91 - connecting claw. Detailed implementation manners

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0049] As Figures 2 - 6 shown, the delivery catheter for the implant delivery device in Embodiment 1 of the present application includes an inner tube 1, a middle layer tube 2, a pointed end 3, a proximal connector 4, an outer tube 5, a long loading tube 6, and a short loading tube 7;

[0050] The pointed end 3 includes a cone body 31 and a connecting body 32 that are independent of each other. The connecting body 32 can be partially embedded into the cone body 31, and the connecting body 32 serves as the distal connector 8;

[0051] The inner tube 1 passes through the connecting body 32 and is connected to the cone body 31;

[0052] The middle layer tube 2 is slidably sleeved on the inner tube 1 and fixedly connected to the connecting body 32. The middle layer tube 2 is fixed on the implant delivery device;

[0053] The proximal connector 4 is slidably sleeved on the middle layer tube 2. The proximal connector 4 is connected to the tail handle of the implant delivery device, and the proximal connector 4 is driven to slide by the tail handle;

[0054] The outer tube 5 is slidably sleeved on the proximal connector 4;

[0055] The long loading tube 6 is connected to the outer tube 5 to cover the proximal connector 4;

[0056] The short loading tube 7 is connected to the conical body 31 to cover the distal connector 8. The short loading tube 7 is butted or sleeved with the long loading tube 6. Preferably, for the sleeved manner, the long loading tube 6 is sleeved on the short loading tube 7. After sleeving, the distal end 11 of the long loading tube 6 can cover the distal connector 8;

[0057] Wherein,

[0058] When the outer tube 5 drives the long loading tube 6 to move along the axial direction, the proximal connector 4 can be exposed or retracted from the long loading tube 6;

[0059] When the inner tube 1 drives the conical body 31 and the conical body 31 drives the short loading tube 7 to move along the axial direction, the distal connector 8 can be exposed or retracted from the short loading tube 7;

[0060] When the proximal connector 4 moves along the axial direction, the relative positional relationship between the proximal connector 4 and the long loading tube 6 is changed to realize the recovery of the self-expanding valve stent 9.

[0061] The implant of the present application is a self-expanding valve stent 9.

[0062] Specifically, a receiving groove 311 is provided in the conical body 31. The receiving groove 311 runs through the large-diameter end of the conical body 31 and is communicated with the outside. A convex portion 321 is provided on the connecting body 32, and the convex portion 321 can be embedded into the receiving groove 311.

[0063] Through the cooperation of the convex portion 321 and the receiving groove 311, the conical body 31 and the connecting body 32 are not easily separated during bending.

[0064] Specifically, the proximal connector 4 includes a support tube 41 and a proximal connection seat 42. The support tube 41 is slidably sleeved on the middle layer tube 2. The proximal connection seat 42 is sleeved on the middle layer tube 2 and fixedly connected to the distal end 11 of the support tube 41. A plurality of card slots 12 are provided on the side wall of the proximal connection seat 42. The card slots 12 are used for clamping and restricting the proximal end 10 of the self-expanding valve stent 9. The support tube 41 is connected to the tail handle of the implant delivery device. The position of the support tube 41 is locked by the tail handle, and the support tube 41 can be driven to slide along the axial direction.

[0065] The function of the support tube 41 is to increase the overall structural strength of the middle layer tube 2, ensure the coaxiality between the middle layer tube 2 and the outer tube 5, and the support tube 41 can also play a role in protecting the middle layer tube 2 to prevent the middle layer tube 2 from breaking during bending.

[0066] It should be noted that the present disclosure only relates to the structure of the delivery catheter for the implant delivery device, and this structure can be used in cooperation with the implant delivery devices of the prior art. Therefore, the structures of other parts of the implant delivery device can refer to the corresponding parts in the prior art.

[0067] For example, CN202122021747.3 - An implant delivery device describes the specific structure of the implant delivery device.

[0068] For example, CN202122021691.1 - An implant delivery device also describes the specific structure of the implant delivery device.

[0069] Specifically, the connecting body 32 includes a distal connecting seat 322. A plurality of clamping grooves 12 are provided on the side wall of the distal connecting seat 322, and the clamping grooves 12 are used for clamping and constraining the distal end 11 of the self - expanding valve stent 9.

[0070] Specifically, the proximal end 10 of the distal connecting seat 322 is a tapered head 13, and the large - diameter end of the tapered head 13 faces the conical body 31.

[0071] Specifically, the proximal end 10 of the proximal connecting seat 42 is a tapered head 13, and the large - diameter end of the tapered head 13 faces the conical body 31.

[0072] The tapered heads 13 of the distal connecting seat 322 and the proximal connecting seat 42 can prevent the situation where the long loading tube 6 and the short loading tube 7 are stuck due to the distal connecting seat 322 and the proximal connecting seat 42 not being smooth enough.

[0073] Preferably, both the distal connecting seat 322 and the proximal connecting seat 42 are cylinders.

[0074] Preferably, the accommodating groove 311 is a conical accommodating groove, and the protruding portion 321 is a conical protruding portion. The small - diameter ends of the conical accommodating groove and the conical protruding portion both face the small - diameter end of the conical body 31.

[0075] Specifically, a guide wire channel (not shown) is provided in the lumen of the inner tube 1. An axial channel 312 communicating with the accommodating groove 311 is provided in the conical body 31. The axial channel 312 is communicated with the guide wire channel. The guide wire passes through the lumen of the inner tube 1 and exits from the axial channel 312 of the conical body 31. During the implantation process of the self - expanding valve stent 9, the guide wire can play a guiding role for the implantation path.

[0076] Preferably, as Figure 4 、 Figure 6 shown, connecting claws 91 are respectively provided at both ends of the self - expanding valve stent 9, and the self - expanding valve stent 9 is clamped and constrained with the corresponding clamping grooves 12 through the connecting claws 91.

[0077] Specifically, the inner tube 1 is made of a polymer material or a metal material; the support tube 41 is supported by a polymer material, and the middle tube 2 is made of a polymer material.

[0078] The loading and releasing processes of the self-expanding valve stent 9 will be described below:

[0079] Loading of the self-expanding valve stent 9: Apply a force to the outer tube 5 to move it in the direction of the proximal end 10. The outer tube 5 drives the long loading tube 6 to move along the axial direction. The long loading tube 6 and the short loading tube 7 gradually separate to create a gap, allowing the proximal connecting seat 42 to be exposed from the long loading tube 6.

[0080] Then, apply a force to the inner tube 1 to move it in the direction of the distal end 11. The inner tube 1 drives the conical body 31, and the conical body 31 drives the short loading tube 7 to move along the axial direction, enabling the distal connecting seat 322 to be exposed from the short loading tube 7.

[0081] For convenient loading, the recommended loading sequence in this application is to load the proximal end 10 of the self-expanding valve stent 9 first and then the distal end 11 of the self-expanding valve stent 9;

[0082] Loading the proximal end 10 of the self-expanding valve stent 9 first: Engage and constrain the proximal end 10 of the crimped self-expanding valve stent 9 with the proximal connecting seat 42. After constraint, move the long loading tube 6 to contract and load the proximal connecting seat 42 and the proximal end 10 of the self-expanding valve stent 9 together into the long loading tube 6;

[0083] Loading the distal end 11 of the self-expanding valve stent 9 later: Engage and constrain the distal end 11 of the crimped self-expanding valve stent 9 with the distal connecting seat 322. After constraint, move the short loading tube 7 in the reverse direction to contract and load the distal connecting seat 322 and the distal end 11 of the self-expanding valve stent 9 together into the short loading tube 7 until the short loading tube 7 is butted or sleeved with the long loading tube 6.

[0084] Thus, the loading of the self-expanding valve stent 9 is completed, as Figure 4 shown.

[0085] Releasing of the self-expanding valve stent 9: The middle section of the self-expanding valve stent 9 is released first, then the distal end 11 is released, and finally the proximal end 10 is released;

[0086] Releasing the middle section of the self-expanding valve stent 9 first: Apply a force to the outer tube 5 to move it in the direction of the proximal end 10. The outer tube 5 drives the long loading tube 6 to move along the axial direction and stop when the distal end of the outer tube 5 approaches the proximal connecting seat 42. At this time, the distal end 11 and the proximal end 10 of the self-expanding valve stent 9 are respectively constrained by the distal connecting seat 322 and the proximal connecting seat 42. The self-expanding valve stent 9 is in a semi-released state and can still move back and forth for precise positioning.

[0087] Release of the distal end 11 of the self-expanding valve stent 9: When the self-expanding valve stent 9 is accurately positioned, a force is applied to the inner tube 1 to move it in the direction of the distal end 11. The inner tube 1 drives the cone 31, and the cone 31 drives the short loading tube 7 to move along the axial direction, completely exposing the distal connecting seat 322 from the short loading tube 7. At this time, the distal end 11 of the self-expanding valve stent 9 is completely separated from the distal connecting seat 322, and the distal end 11 of the self-expanding valve stent 9 automatically expands and unfolds, fixing at the annulus position.

[0088] Release of the proximal end 10 of the self-expanding valve stent 9: Continue to apply a force to the outer tube 5 to move it in the direction of the proximal end 10. The outer tube 5 drives the long loading tube 6 to move along the axial direction, completely exposing the proximal connecting seat 42 from the long loading tube 6. At this time, the proximal end 10 of the self-expanding valve stent 9 is completely separated from the proximal connecting seat 42, and the proximal end 10 of the self-expanding valve stent 9 automatically expands and unfolds.

[0089] Thus, the release of the self-expanding valve stent 9 is completed, as Figure 6 shown.

[0090] For the delivery catheter of the implant delivery device in the first embodiment, the middle section of the self-expanding valve stent 9 is released first, then the distal end 11 is released (the distal connecting seat 322 is exposed from the short loading tube 7), and finally the proximal end 10 is released (the proximal connecting seat 42 is exposed from the short loading tube 7). In this way, the controllability of the release of the self-expanding valve stent 9 is better, and it is not easy to jump forward.

[0091] When the distal end 11 of the self-expanding valve stent 9 is released first, after the distal end 11 of the self-expanding valve stent 9 is separated from the distal connecting seat 322, since the proximal end 10 of the self-expanding valve stent 9 is constrained by the proximal connecting seat 42, and the support tube 41 is connected and locked by the tail handle of the implant delivery device (that is, without operating the tail handle, the support tube 41 cannot move axially), the relative position of the proximal connecting seat 42 and the long loading tube 6 remains unchanged. Therefore, when the distal end 11 of the self-expanding valve stent 9 is completely separated from the distal connecting seat 322, under the action of the proximal connecting seat 42, the self-expanding valve stent 9 will not shift or jump forward, improving the accuracy of the implant release position.

[0092] For this application, according to the above release sequence, as long as the distal connecting seat 322 is not exposed from the short loading tube 7, the self-expanding valve stent 9 can be conveniently retrieved. The specific reason is:

[0093] After the middle section of the self-expanding valve stent 9 is released first, at this time, since both ends of the self-expanding valve stent 9 are still constrained by the proximal connector 42 and the distal connector 322, the middle section of the self-expanding valve stent 9 first emerges from the gap between the short loading tube 7 and the long loading tube 6. The advantage of this is that the middle section of the exposed self-expanding valve stent 9 will be affected by the constrained state of both ends of the self-expanding valve stent 9. At this time, the self-expanding valve stent 9 is in a semi-released state. At this time, if the release position needs to be adjusted, the delivery device can be moved as a whole to position the self-expanding valve stent 9 at a suitable position. If the self-expanding valve stent 9 is not suitable for release and needs to be retrieved, at this time, push the outer tube 5 distally to 11 while retracting the proximal connector 4, so that the middle section of the exposed self-expanding valve stent 9 can be more easily retracted into the long loading tube 6 to complete the retrieval of the self-expanding valve stent 9. After retrieval, re-select the release position for release, reducing the operation difficulty and increasing the operation error tolerance rate.

[0094] Embodiment 2:

[0095] As Figures 7 - 10 shown, the delivery catheter for the implant delivery device in Embodiment 2 of the present application is an improvement over Embodiment 1. Based on Embodiment 1, the difference between Embodiment 2 and Embodiment 1 is as follows:

[0096] A proximal connector 42 is slidably mounted on the support tube 41. A distal limit step 411 is provided at the distal end 11 of the support tube 41 to prevent the proximal connector 42 from detaching from the support tube 41.

[0097] When the self-expanding valve stent 9 is snap-fitted and constrained with the proximal connector 42 and the distal connector 322 and the loading is completed, there is a certain distance between the distal limit step 411 and the proximal connector 42, as Figure 9As shown in the figure. In this way, a force is applied to the outer tube 5 to move it in the direction towards the proximal end 10. The outer tube 5 drives the long loading tube 6 to move along the axial direction. At this time, the middle section of the self-expanding valve stent 9 gradually emerges from the gap. Under the action of the self-expansion of the self-expanding valve stent 9 itself, it will drive the proximal connecting seat 42 to slide in the direction towards the distal end 11 of the support tube 41 until the proximal connecting seat 42 abuts against the distal limiting step 411 (it is necessary to ensure that when the proximal connecting seat 42 abuts against the distal limiting step 411, the proximal connecting seat 42 has not completely emerged from the long loading tube 6). In this way, since the proximal end 10 of the self-expanding valve stent 9 is constrained by the proximal connecting seat 42 and the support tube 41 is connected and locked by the tail handle of the implant delivery device (that is, the support tube 41 cannot move axially without operating the tail handle), the relative position between the proximal connecting seat 42 and the long loading tube 6 remains unchanged. Therefore, when the distal end 11 of the self-expanding valve stent 9 is completely separated from the distal connecting seat 322, under the action of the proximal connecting seat 42, the self-expanding valve stent 9 cannot jump forward. Thus, it is possible to avoid the situation where the distal end 11 of the self-expanding valve stent 9 is released first and the self-expanding valve stent 9 will jump forward, thereby improving the accuracy of the implant release position.

[0098] In addition, during the process of retrieving the self-expanding valve stent 9 (that is, the distal connecting seat 322 has not emerged from the short loading tube 7), if the self-expanding valve stent 9 is not suitable for release and needs to be retrieved, at this time, push the outer tube 5 distally while retracting the proximal connecting member 4, so that the middle section of the exposed self-expanding valve stent 9 can be more easily retracted into the long loading tube 6 to complete the retrieval of the self-expanding valve stent 9. After retrieval, re-select the release position for release, reducing the operation difficulty and increasing the operation error tolerance rate.

[0099] Compared with the solution of Embodiment 1, due to the larger contact area between the distal limiting step 411 and the proximal connecting seat 42, a greater force can be applied to the proximal connecting seat 42, making it easier to pull the self-expanding valve stent 9 for retrieval and improving the retrieval efficiency of the self-expanding valve stent 9.

[0100] Embodiment 3:

[0101] As Figure 11 shown, the implant delivery device provided in this Embodiment 3 includes a handle 15 and the delivery catheter for the implant delivery device in Embodiment 1 or Embodiment 2;

[0102] The handle 15 includes a control mechanism. The control mechanism is operably connected to the outer tube 5 to manipulate the outer tube 5 so that when the outer tube 5 drives the long loading tube 6 to move along the axial direction, the proximal connecting seat 42 can emerge from or be retracted into the long loading tube 6;

[0103] The middle layer tube 2 is fixed inside the handle 15;

[0104] A first tail handle 16 and a second tail handle 17 are slidably mounted on the handle 15. Both the first tail handle 16 and the second tail handle 17 can slide along the axial direction on the handle 15 and can be locked in position on the handle 15.

[0105] The first tail handle 16 is connected to the proximal connecting member 4. Thus, when the first tail handle 16 drives the support tube 41 and the proximal connecting seat 42 to move along the axial direction, the relative positional relationship between the proximal connecting seat 42 and the long loading tube 6 is changed to realize the recovery of the self-expanding valve stent 9. The second tail handle 17 is connected to the inner tube 1. Thus, when the second tail handle 17 drives the inner tube 1, the inner tube 1 drives the cone 31, and the cone 31 drives the short loading tube 7 to move along the axial direction, the distal connecting seat 322 can be exposed or retracted from the short loading tube 7.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this patent and are not intended to limit them. Although the above embodiments have been described in detail with reference to this patent, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the above embodiments, or perform equivalent replacements for some or all of the technical features. 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 this patent.

Claims

1. A delivery catheter for an implant delivery device, characterized in that, It includes an inner tube, a middle layer tube, a pointed end, a proximal connector, an outer tube, a long loading tube and a short loading tube; The pointed end includes a cone body and a connecting body that are independent of each other. The connecting body can be partially embedded into the cone body, and the connecting body serves as a distal connector; The inner tube passes through the connecting body and is connected to the cone body; The middle layer tube is slidably sleeved on the inner tube and is fixedly connected to the connecting body. The middle layer tube is fixed on the implant delivery device; The proximal connector is slidably sleeved on the middle layer tube; The outer tube is slidably sleeved on the proximal connector; The long loading tube is connected to the outer tube to cover the proximal connector; The short loading tube is connected to the cone body to cover the distal connector. The short loading tube is docked or sleeved with the long loading tube.

2. The delivery catheter for an implant delivery device according to claim 1, wherein, A receiving groove is provided in the cone body. The receiving groove penetrates through the large diameter end of the cone body and is communicated with the outside. A protruding portion is provided on the connecting body, and the protruding portion can be embedded into the receiving groove.

3. The delivery catheter for an implant delivery device according to claim 1, wherein, The proximal connector includes a support tube and a proximal connection seat. The support tube is slidably sleeved on the middle layer tube, and the proximal connection seat is slidably mounted on the support tube. A plurality of clamping grooves are provided on the side wall of the proximal connection seat, and the clamping grooves are used for clamping and restraining the proximal end of the implant, or, The proximal connector includes a support tube and a proximal connection seat. The support tube is sleeved on the middle layer tube, and the proximal connection seat is fixedly connected to the distal end of the support tube. A plurality of clamping grooves are provided on the side wall of the proximal connection seat, and the clamping grooves are used for clamping and restraining the proximal end of the implant.

4. The delivery catheter for an implant delivery device according to claim 2, characterized in that, The connecting body includes a distal connection seat. A plurality of clamping grooves are provided on the side wall of the distal connection seat, and the clamping grooves are used for clamping and restraining the distal end of the implant.

5. The delivery catheter for an implant delivery device according to claim 3, characterized in that, A distal limiting step is provided at the distal end of the support tube. Through the distal limiting step, the proximal connection seat is prevented from detaching from the support tube.

6. The delivery catheter for an implant delivery device according to claim 2, wherein, A guide wire channel is provided in the lumen of the inner tube. An axial channel communicated with the receiving groove is provided in the cone body, and the axial channel is communicated with the guide wire channel.

7. The delivery catheter for an implant delivery device according to claim 3, characterized in that, The proximal end of the proximal connection seat is a conical head, and the large diameter end of the conical head faces the cone body.

8. The delivery catheter for an implant delivery device according to claim 4, characterized in that, The proximal end of the distal connection seat is a conical head, and the large diameter end of the conical head faces the cone body.

9. The delivery catheter for an implant delivery device according to claim 1, characterized in that, The inner tube is made of metal or polymer material.

10. An implant delivery device, characterized in that, It includes a handle and a delivery catheter for an implant delivery device according to any one of claims 1-9; The handle includes a control mechanism. The control mechanism is operably connected to the outer tube to manipulate the outer tube. When the outer tube drives the long loading tube to move along the axial direction, the proximal connector can be exposed or retracted from the long loading tube; The middle layer tube is fixed in the handle; A first tail handle and a second tail handle are slidably mounted on the handle. Both the first tail handle and the second tail handle can slide along the axial direction on the handle and can be locked in position on the handle; The first tail handle is connected to the proximal connecting member. Thus, when the proximal connecting member is driven by the first tail handle to move along the axial direction, the relative positional relationship between the proximal connecting member and the long loading tube is changed, realizing the retrieval of the implant. The second tail handle is connected to the inner tube. Thus, when the second tail handle drives the inner tube, the inner tube drives the conical body, and the conical body drives the short loading tube to move along the axial direction, the distal connecting member can be exposed or retracted from the short loading tube.

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