Conveyors and conveying systems

Abstract

The present invention provides a conveyor for conveying an implant, comprising a sheath core, a guide head, and an anchoring member, wherein the guide head is located at the distal end of the sheath core, the anchoring member is located on the sheath core and close to the proximal end of the guide head, the anchoring member comprises an anchoring bottom and an anchoring portion extending from the anchoring bottom to the distal end, the conveyor further comprises a push rod that is sleeved on the sheath core and can move axially relative to the sheath core, the distal end of the push rod is provided with a receiving portion, and when the conveyor completes the release of the implant and is ready to be withdrawn, the push rod can move axially so that the anchoring bottom is received in the receiving portion. The conveyor provided by the present invention solves the problem of difficulty in withdrawing the conveyor caused by the welding area or the anchoring bottom of the anchoring member being easily scratched or hooked with the blood vessel by providing a receiving portion at the distal end of the push rod.

Description

Technical Field

[0001] The present invention relates to the technical field of interventional medical devices, and in particular to a conveyor and a conveying system. Background Art

[0002] Due to various diseases or injuries, the human aorta is prone to damage to the aortic endothelium or vascular wall, forming an aneurysm disease. Once the aneurysm ruptures, blood gushes out of the blood vessels, causing insufficient blood supply to the human body, leading to shock or death. For aneurysm disease, the treatment of aneurysms in different locations varies. The most common treatments are surgical treatment, aneurysm embolization, and endovascular repair of aneurysms. Surgical treatment mainly involves aneurysm resection and arterial reconstruction; for some visceral aneurysms, coil embolization can be used to form a thrombus in the aneurysm to prevent further expansion, rupture, and bleeding; endovascular repair uses a covered artificial vascular stent for endovascular repair of the aneurysm, which is less invasive and has significant efficacy.

[0003] Endovascular repair has become the mainstream method for treating cardiovascular diseases in recent years due to its advantages of minimal trauma and significant efficacy. With the continuous improvement of interventional technology, the advantages of endovascular repair are becoming increasingly prominent. The use of covered stents requires the use of a delivery device to deliver them to the lesion site for treatment. The covered stent must first be compressed into the sheath of the delivery device. Generally, the femoral artery or iliac artery is selected for puncture. A guidewire is used to establish a track. The delivery device is passed through the iliac artery, abdominal aorta, thoracic aorta, aortic arch, and ascending aorta to establish a delivery path. After delivery to the designated location of the lesion, the covered stent is released, deployed, and adhered to the aneurysm wall. The membrane covering the stent can isolate the blood flow from the lesion site, eliminating the impact of blood flow on the aneurysm wall at the lesion site and re-establishing a normal blood circulation channel. After the stent is released, the guidewire and delivery device are withdrawn, thus achieving interventional treatment of aneurysms and arterial dissections.

[0004] In existing delivery devices, the inner sheath core is equipped with an anchor at the front end to significantly enhance the stability of stent release. This allows for better positioning of the stent at the desired location, ensuring more stable stent deployment and preventing stent ejection. However, because delivery devices for iliac bifurcation stents are primarily used in vessels located at the iliac bifurcation, which have smaller diameters, the process of delivering the stent to the desired location can easily cause or exacerbate vessel wrinkles and accumulation. After stent deployment, the sheath is detached from the front guide. Due to the wrinkles and accumulations caused by the delivery device, the sheath, lacking the guide to guide the transition and adhering to the vessel, complicates advancement of the sheath and the retraction of the sheath core. Furthermore, due to the presence of the proximal anchor, the sheath core can easily scrape against the vessel during delivery, or become caught in the vessel due to severe wrinkles and accumulations. This can complicate delivery and ultimately require further endovascular intervention to facilitate successful delivery. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a conveyor and a conveying system to address the problem in the prior art that the conveyor is difficult to withdraw in the blood vessel at the bifurcation due to the presence of anchors.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a conveyor, including a sheath core, a guide head and an anchoring member, the guide head is located at the distal end of the sheath core, the anchoring member is located on the sheath core and close to the proximal end of the guide head, the anchoring member includes an anchoring bottom and an anchoring portion extending from the anchoring bottom to the distal end, the conveyor also includes a push rod which is sleeved on the sheath core and can move axially relative to the sheath core, the distal end of the push rod is provided with a receiving portion, when the conveyor is retracted, the push rod can move axially so that the anchoring bottom is received in the receiving portion, the receiving portion includes a receiving groove with an opening toward the anchoring member, and the receiving groove is an embedded groove adapted to the anchoring bottom, The outer diameter of the push rod is greater than or equal to the outer diameter of the anchor; a first handle is fixed to the proximal end of the push rod and the first handle is coaxially sleeved on the sheath core, the conveyor also includes a sheath tube coaxially sleeved on the push rod and movable axially relative to the push rod, a second handle is fixed to the proximal end of the sheath tube, and the second handle is coaxially sleeved on the push rod, when the conveyor completes the release of the implant and is ready to withdraw, the distance between the distal end of the first handle and the proximal end of the second handle is defined as L1, and the distance between the distal end of the receiving portion and the distal end of the anchor bottom is defined as L2, then L1 and L2 satisfy: L1≥L2, so that the push rod can be pushed forward to the receiving groove to accommodate the anchor.

[0007] In one embodiment, the anchor is U-shaped, and the opening of the anchor is toward the distal end of the conveyor. Part of the side surface of the receiving groove is provided with at least one cutout with an opening toward the distal end of the conveyor, so that the receiving groove is connected to the outside world.

[0008] In one embodiment, a first handle is provided at the proximal end of the push rod, and the first handle is coaxially sleeved on the sheath core, the proximal end of the sheath core is exposed from the proximal end of the first handle, and orientation marks are respectively provided on the proximal end of the sheath core and the first handle.

[0009] In one embodiment, the anchor is in a three-dimensional multi-claw shape, and the opening of the anchor faces the distal end of the conveyor.

[0010] In one embodiment, the anchor is three-dimensional, and the opening of the anchor is toward the distal end of the conveyor. The receiving groove is a cavity facing the anchor, and the inner diameter of the cavity is greater than or equal to the outer diameter of the anchor.

[0011] In one embodiment, the distal end of the push rod includes a tapered end.

[0012] In one embodiment, the distal end of the push rod includes a smooth arc surface.

[0013] In one embodiment, the distal end surface of the push rod is coated with a hydrophilic coating.

[0014] In one embodiment, the first handle includes a first shell, a first handle end cover and a fastener. The first shell is fixedly connected to the proximal end of the push rod. The first handle end cover is located at the proximal opening of the first shell. The fastener is controlled by the first handle end cover to fix the push rod relative to the sheath core.

[0015] In one embodiment, a stop mark is further provided on the sheath core.

[0016] The present invention also provides a delivery system, comprising the delivery device as described above, wherein the delivery system further comprises an implant, and the implant is hooked on the anchor.

[0017] The above-mentioned conveyor is provided with a receiving portion at the distal end of the push rod, so that when the conveyor is retracted, the part of the anchor that is easily scratched or hooked with the blood vessel wall is accommodated in the receiving portion, thereby solving the problem of difficulty in retracting the conveyor caused by the welding area or the anchor bottom of the anchor being easily scratched or hooked with the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 This is a schematic structural diagram of a conveyor according to an embodiment of the present invention after completing the release of a stent graft;

[0020] Figure 2 yes Figure 1 A schematic structural diagram of the distal end portion of the conveyor;

[0021] Figure 3 yes Figure 1 a cross-sectional view of the distal end portion of the conveyor;

[0022] Figure 4 This is a schematic diagram of a partial structure of a conveyor before releasing a stent graft according to an embodiment of the present invention;

[0023] Figure 5 yes Figure 4 sectional view of

[0024] Figure 6 This is a structural diagram of a push rod of a conveyor according to an embodiment of the present invention completing the accommodation of an anchor member;

[0025] Figure 7 yes Figure 6 A schematic structural diagram of the distal end portion of the conveyor;

[0026] Figure 8 yes Figure 7 a cross-sectional view of the distal end portion of the conveyor;

[0027] Figure 9 is a cross-sectional view of a first handle (sheath core not shown) of a delivery device according to an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the state of the conveyor calibration orientation mark according to one embodiment of the present invention;

[0029] Figure 11 yes Figure 6 Enlarged view of point A in the middle;

[0030] Figure 12 is a partial cross-sectional view of a first handle of a conveyor according to an embodiment of the present invention;

[0031] Figure 13 yes Figure 12 Enlarged view of point B in the middle;

[0032] Figure 14 A schematic structural diagram of a conveyor according to an embodiment of the present invention showing a push rod and a sheath core being withdrawn together into a sheath tube;

[0033] Figure 15 is a schematic structural diagram of an anchor member of a conveyor according to another embodiment of the present invention;

[0034] Figure 16 is a partial structural schematic diagram of a conveyor according to another embodiment of the present invention;

[0035] Figure 17 is a partial cross-sectional view of a conveyor according to another embodiment of the present invention when the receiving portion has completed receiving the anchoring bottom;

[0036] Figure 18 is a partial structural diagram of a conveyor according to yet another embodiment of the present invention;

[0037] Figure 19 It is a partial cross-sectional view of the receiving portion of a conveyor according to another embodiment of the present invention when the receiving portion completes receiving the anchoring bottom. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In this application, "proximal" refers to the end closest to the operator, "proximal side" refers to the side closest to the operator, "distal" refers to the end farther from the operator, and "distal side" refers to the side farther from the operator. "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the medical device, and "radial" refers to the direction perpendicular to the axial direction.

[0042] In this application, "covered stent" refers to a structure in which the surface of a bare stent is covered with a thin film, and a bare stent refers to a structure comprising a plurality of wavy rings without a thin film between the wavy rings.

[0043] Example 1

[0044] like Figure 1-3As shown, the delivery device 10 includes a guide head 11, an anchor 12, a sheath core 13, a push rod 14, a first handle 15, a sheath tube 16, and a second handle 17. The guide head 11 is located at the distal end of the sheath core 13, and the anchor 12 is located on the sheath core 13 near the proximal end of the guide head 11. The push rod 14 is coaxially mounted on the sheath core 13 and is axially movable relative to the sheath core 13. The proximal end of the push rod 14 is fixed with the first handle 15, which is coaxially mounted on the sheath core 13, with the proximal end of the sheath core 13 protruding from the proximal end of the first handle 15. The sheath tube 16 is coaxially mounted on the push rod 14 and is axially movable relative to the push rod 14. The proximal end of the sheath tube 16 is fixed with the second handle 17, which is coaxially mounted on the push rod 14. A receiving portion 143 is provided at the distal end of the push rod 14. Specifically, the receiving portion 143 includes a receiving groove 1431 opening toward the anchor 12. When the conveyor 10 completes the complete release of the implant (the implant in this embodiment is the coated stent 40) and is ready to be withdrawn (that is, when the coated stent is completely released), the push rod 14 is pushed forward to the receiving groove 1431 to accommodate the anchor 12, and then withdrawn together.

[0045] like Figure 1-5 As shown, a certain distance is reserved between the distal end of the push rod 14 and the anchor 12, so that the stent graft 40 can be loaded to the reserved position between the anchor 12 and the push rod 14 and the distal end of the stent graft 40 is hooked on the anchor 12. Before the stent graft 40 is released (as shown in FIG. Figure 4-5 As shown), the distal end of the sheath 16 surrounds the stent graft 40 and is sleeved on a portion of the guide head 11. After loading, the stent graft 40 is delivered to the lesion site using the conveyor 10, the push rod 14 and the sheath core 13 are kept relatively locked, and the first handle 15 is fixed at the same time. The operator can operate the second handle 17 to achieve relative movement between the sheath 16 and the push rod 14, and withdraw the sheath 16 axially toward the proximal direction until the push rod 14 is exposed and the ear of the implant is detached from the anchoring portion 122, thereby achieving the release of the stent graft 40, that is, from Figure 4-5 The status shown changes to Figure 1-3 The status shown.

[0046] Specifically, if Figure 1-3 As shown, the proximal end of the guide head 11 is fixed to the distal end of the sheath core 13, and the anchor 12 is fixed to the outer wall of the sheath core 13 and close to the proximal end of the guide head 11. The sheath core 13 and the guide head 11 are connected to each other as a hollow structure and form a guide wire hole 50 to facilitate the delivery of the stent graft 40 by the delivery device 10 along the guide wire.

[0047] In this embodiment, the anchor 12 is a U-shaped structure. Figure 1-3As shown, the anchor 12 includes an anchoring base 121 and an anchoring portion 122. The anchoring base 121 is welded to the outer wall of the sheath core 13 near the guide head 11. The anchoring portion 122 is formed as two claws extending distally from the anchoring base 121. The two claws are integrally formed with the anchoring base 121 to form a U-shaped structure. The claws and the anchoring base 121 form two corners at either end of the anchoring base 121. In conventional delivery devices, if the sheath core 13 is directly withdrawn, the exposed corners or the weld between the anchoring base 121 and the sheath core 13 are prone to snagging or scratching the vessel wall at the bifurcation.

[0048] The push rod 14 includes a rigid section 141 connected to the distal end of the first handle 15 and a flexible section 142 passing through the sheath 16. The push rod 14 can move axially relative to the sheath core 13 under the drive of the first handle 15, and the sheath 16 can move axially relative to the push rod 14 under the drive of the second handle 17. Figure 1 Combine Figure 9 As shown, the second handle 17 is sleeved on the rigid section 141, which facilitates the sliding of the second handle 17 on the push rod 14. The flexible section 142 is used to fill the cavity formed between the sheath tube 16 and the sheath core 13, which can increase the bending resistance of the sheath tube 16. The distal end of the flexible section 142 is provided with a receiving portion 143. When the conveyor 10 completes the release of the coated stent 40 at the lesion site, as shown in FIG. Figure 1 In the state shown, the conveyor 10 needs to be withdrawn from the human body. When the conveyor 10 is ready to be withdrawn, first fix the second handle 17 and the sheath core 13 so that the sheath tube 16 and the sheath core 13 remain stationary relative to the human body, and then control the first handle 15 to make the push rod 14 move axially to the anchor 12 and continue to move until the anchor part 122 is accommodated in the receiving groove 1431, thereby realizing the overall covering of the U-shaped anchor 12 by the receiving groove 1431, and then tighten the first handle end cover 154 to fix the push rod 14 and the sheath core 13 relatively and withdraw them together into the sheath tube 16, and finally lock the second handle 17 and withdraw them from the human body together with the sheath tube 16. The setting of the receiving portion 143 can prevent the parts of the conveyor 10 that are prone to hooking the blood vessel wall from being exposed during the retraction process, avoid the problem that the sheath 16 is difficult to push forward and cannot cover the anchor part due to the adhesion of the sheath 16 to the blood vessel and the lack of the guide head 11 to guide the transition, thereby causing difficulty in retracting the conveyor, or avoid the problem that the sheath core 13 is easily hooked and scraped against the blood vessel at the place where the blood vessel folds and accumulation are serious due to the direct retraction of the sheath core 13 due to the presence of the anchor part 12, thereby achieving the safe recovery of the sheath core 13 into the sheath tube 16, solving the problem of difficulty in retracting the conveyor 10 due to the anchor part 12.

[0049] In this embodiment, if Figure 1-3As shown, the anchor 12 is U-shaped, with its opening facing the distal end of the conveyor 10. This U-shaped anchor offers a simple structure, effective fixing, and low cost. Part of the side surface of the receiving groove 1431 is provided with at least one notch opening toward the distal end of the conveyor, connecting the receiving groove to the outside world. In other words, the receiving groove is a through slot opening toward the distal end of the conveyor. The push rod 14 is a hollow cylindrical rod, and the receiving portion 143 is provided with a receiving groove 1431 at the distal end of the flexible section 142 for accommodating the anchor 12. The outer diameter of the push rod 14 is the same as or slightly larger than the maximum radial dimension of the U-shaped structure. In this embodiment, the groove is a through groove having the same width as the maximum width of the U-shaped anchor. When the distal end of the push rod 14 is pushed flush with the distal end of the anchor portion 122, the U-shaped anchor 12 can be entirely received within the receiving groove 1431, achieving full cross-coverage protection of the push rod 14 on the anchor 12, ensuring that when the sheath core 13 and the push rod 14 are withdrawn into the sheath tube 16, the anchor 12 is entirely received within the push rod 14. In other embodiments, the distal end of the push rod 14 can also be pushed until the anchor bottom 121 of the anchor 12 is received within the groove, thereby preventing the corner formed at the anchor bottom 121 or the weld between the anchor bottom 121 and the sheath core 13 from being exposed.

[0050] The distal end face of the push rod 14 is a smooth arc surface, which can reduce the scraping between the push rod 14 and the inner wall of the blood vessel when the push rod 14 is pushed forward to accommodate the anchor 12, thereby avoiding unnecessary damage to the blood vessel. In other embodiments, a hydrophilic coating can also be applied on the smooth arc surface to make the advancement of the push rod 14 more lubricated and smooth.

[0051] like Figure 1 、 Figure 9-10 Combine Figure 14 As shown, the first handle 15 is coaxially sleeved on the sheath core 13, and its distal end is fixedly connected to the proximal end of the rigid section 141. The first handle 15 includes a first shell 151, a central axis 152 for fixing the push rod 14, a fastener 153 and a first handle end cover 154 for controlling the fastener 153 to be fixed or separated from the sheath core 13. The first shell 151 is surrounded by a receiving cavity 1511 with openings at both ends. The first shell 151 has multiple symmetrical snap-in plates 1512 extending into the receiving cavity 1511. The first handle end cover 154 is located at the proximal opening of the first shell 151.

[0052] Furthermore, if Figure 9-10 As shown, a fixing groove 1521 is provided at the corresponding position of the central axis 152 and the clamping plate 1512, and one end of the multiple clamping plates 1512 is fixed on the inner wall of the first shell 151, and the other end is fixed on the central axis 152 or in the fixing groove 1521, thereby fixing the central axis 152 in the receiving cavity 1511 formed by the first shell 151.

[0053] The clamping plate 1512 can be fixed to the inner wall of the first shell 151 by gluing, welding or mechanical structural connection, or, in other embodiments, the clamping plate 1512 and the first shell 151 are integrally formed by injection molding.

[0054] like Figure 6-9 Combine Figure 12-13 As shown, the distal end of the central axis 152 is fixed to the proximal end of the rigid section 141, the proximal end of the central axis 152 extends from the proximal end of the first shell 151 and is provided with an external thread, the first handle end cover 154 is provided with an internal thread so that the central axis 152 and the first handle end cover 154 are connected by threads, and the first handle end cover 154 is provided with a connecting portion 1541 connected to the proximal end of the fastener 153. The fastener 153 is sleeved on the sheath core 13 ( Figure 9 and Figure 12 The sheath core is not shown) and is located between the first handle end cover 154 and the proximal end of the central axis 152. The proximal end of the fastener 153 is an elastic portion 1531 that can be tightened under pressure. The first handle end cover 154 and the fastener 153 are slidably connected around the elastic portion 1531 through the connecting portion 1541, and the connecting surfaces of the two are inclined relative to the axial direction, so that when the first handle end cover 154 is screwed in (tightened) axially toward the distal end relative to the central axis 152 through the thread, a radial extrusion force is generated on the elastic portion 1531, so that the fastener 153 clamps the sheath core 13 ( Figure 9 and 12 The sheath core is not shown in the figure) so as to achieve relative fixation of the sheath core 13 and the push rod 14. By rotating the first handle end cover 154 in the opposite direction, the fixed relationship between the sheath core 13 and the push rod 14 is released, so that the push rod 14 can move axially relative to the sheath core 13.

[0055] like Figure 9-10 Combine Figure 6 As shown, orientation marks are provided on the proximal end of the sheath core 13 and the first handle 15, respectively. Specifically, they can be set as colored orientation lines. In other embodiments, the orientation marks can also be set in other places as long as they can be easily accommodated. The orientation line 131a on the first handle 15 is located at the proximal end of the central axis 152 and protrudes from the first shell 151. In this embodiment, since the accommodation portion 143 is provided with a receiving groove 1431 radially at the distal end of the flexible section 142, when it is necessary to adjust the U-shaped anchor to be aligned with the radially provided receiving groove 1431 so as to accommodate the U-shaped anchor in the receiving groove, the first handle end cover 154 is removed from the first handle 15 to expose the central axis 152 protruding from the proximal end of the first shell 151. When the orientation line 131b on the sheath core 13 is adjusted to be collinear with the orientation line 131a on the central axis 152 at the same angle, as shown in FIG. Figure 10As shown, the notch of the receiving groove 1431 on the receiving portion 143 at the distal end of the push rod 14 is directly opposite to the U-shaped anchor 12, so that the U-shaped anchor 12 can be more smoothly received in the receiving portion. At this time, the structural state of the conveyor guide head side is as follows: Figure 6-8 In other embodiments, the first handle end cap 154 ​​may be made of a transparent plastic material to facilitate viewing of the orientation mark.

[0056] In this embodiment, if Figure 12-13 As shown, the first handle end cover 154 is connected to the proximal end of the central axis 152 by means of a buckle and a thread. After the thread is completely loosened, the buckle 155a of the first handle end cover 154 contacts the buckle 155b on the central axis 152. At this time, the buckle connection prevents the first handle end cover 154 from falling off. When the orientation line needs to be used for orientation adjustment, the buckle connection facilitates the removal of the first handle end cover 154 from the central axis 152. Figure 12-13 The end cap of the second handle is provided at the tail end of the second handle in the same manner as the end cap 154 ​​of the first handle, and a rubber plug is provided between the shaft and the push rod to prevent blood leakage.

[0057] The sheath core 13 is also provided with a stop mark, which can be specifically provided as a stop line 132 around the circumference of the sheath core 13. Figure 11 As shown, when the push rod 14 is pushed forward to accommodate the anchor 12 in its entirety in the receiving groove 1431, that is, when the distal end of the push rod 14 is flush with the distal end of the anchor portion 122, the stop line 132 leaks out from the proximal end of the first handle 15, as shown in FIG. Figure 6-8 Combine Figure 11 As shown, it shows that the entire anchor 12 has been accommodated. When the stop mark leaks out, the push rod 14 is stopped, and the structural state of the conveyor guide head side is as follows: Figure 7 shown.

[0058] like Figure 1-6 As shown, the delivery device 10 further includes a sheath 16 and a second handle 17. The sheath 16 and the second handle 17 are both coaxially sleeved on the push rod 14 and can move axially relative to the push rod 14. The distal end of the second handle 17 is fixed to the proximal end of the sheath 16. When the delivery device 10 completes the release of the stent graft 40 and is ready to be withdrawn, the distance between the distal end of the first handle 15 and the proximal end of the second handle 17 is defined as L1, and the distance between the distal end of the receiving groove 1431 and the distal end of the anchor 12 is defined as L2. Figure 1 As shown, L1 and L2 satisfy: L1 ≥ L2, so that after the coated bracket 40 is released, the reserved distance between the first handle 15 and the second handle 17 can be met. After the coated bracket is released, the first handle 15 pushes the push rod 14 toward the distal end until the corner tip of the anchor bottom 121 or the entire anchor 12 is accommodated in the receiving groove 1431.

[0059] The conveyor 10 is loaded with the stent graft 40 at the reserved position between the anchor 12 and the push rod 14. The distal end structure of the loaded conveyor 10 is as follows: Figure 4-5 The stent graft 40 is delivered to the lesion site by the delivery device 10, and the sheath tube 16 is driven to withdraw axially toward the proximal end by the second handle 17 (the sheath core 13 and the push rod 14 are fixed and stationary relative to the human body at this time). After the stent graft 40 is released at the lesion site, the delivery device 10 needs to be withdrawn from the human body. After the stent graft 40 is released, the distal end structure of the delivery device 10 is as shown in FIG. Figure 2-3 shown.

[0060] After the conveyor 10 releases the stent graft 40, Figure 1-3 As shown, at this time, the conveyor 10 has completed the release of the stent graft and is ready to withdraw. The specific process of the conveyor 10 receiving the anchoring bottom 121 or the anchoring member 12 as a whole through the receiving portion 143 is as follows:

[0061] (1) Loosen the first handle end cap 154 ​​to allow the push rod 14 and the sheath core 13 to move relative to each other, keep the second handle and the sheath core 13 stationary relative to the human body, first push the first handle 15 axially toward the distal end until the push rod 14 is close to the anchor bottom 121, observe through the transparent first handle end cap 154, and rotate the first handle 15 relative to the sheath core 13 around the axial direction, using the orientation lines set on the proximal end of the sheath core 13 and the central axis 152, as shown in FIG. Figure 9-10 As shown, the direction of the groove notch is fine-tuned, when the orientation line 131b on the sheath core 13 and the orientation line 131a on the central axis 152 are collinear at the same angle, as shown in FIG. Figure 10 As shown, the notch of the receiving groove 1431 is opposite to the U-shaped anchor 12; (or the first handle end cover 154 is removed from the central axis 152 to facilitate observation of the orientation line, and the first handle end cover 154 is snapped back into place after orientation is completed), and then the first handle 15 is continuously pushed axially toward the distal end until the stop line 132 provided on the sheath core 13 leaks out from the proximal end of the first handle 15, as shown. Figure 11 Combine Figure 6-8 As shown, stop pushing the first handle 15. At this time, the distal end of the push rod 14 is flush with the distal end of the anchor portion 122, and the anchor member 12 is completely accommodated in the receiving groove 1431. Figure 6-8 In this process, the position of the first handle 15 of the conveyor 10 and the receiving portion 143 of the push rod 14 relative to the second handle 17 changes as follows: Figure 1 The state moves to Figure 6 status.

[0062] (2) Tighten the first handle end cap 154 ​​using the threaded structure to fix the push rod 14 and the sheath core 13 relatively, keep the second handle 17 stationary relative to the human body, and pull the first handle 15 toward the proximal end until the proximal side of the guide head 11 is accommodated in the sheath tube 16, as shown in FIG. Figure 14 In this process, the position of the first handle 15, the push rod 14 and the guide head 11 of the conveyor 10 relative to the second handle 17 changes as follows: Figure 6 The state moves to Figure 14 status.

[0063] (3) Finally, the entire conveyor 10 is slowly withdrawn from the body.

[0064] Example 2

[0065] like Figure 15-17 As shown, the difference between the conveyor of this embodiment and the first embodiment is that the anchor 22 is a three-dimensional multi-claw type, so there is no need to set a directional mark. Figure 15 As shown, the anchoring member 22 includes an anchoring bottom 221 , a connecting seat 223 fixed to the anchoring bottom 221 , and an anchoring portion 222 extending distally from the connecting seat 223 . The anchoring portion 222 is a plurality of claws uniformly distributed circumferentially around the sheath core 23 .

[0066] like Figure 16 As shown, the distal end of the receiving portion 243 is provided with an embedding groove 2431 with an opening toward the distal end. The embedding groove is adapted to the shape of the anchoring bottom 221, and the outer diameter of the push rod 24 is equal to the outer diameter of the anchoring member 22, so that when the push rod 24 is pushed to the anchoring member 22, only the anchoring bottom 221 is received in the embedding groove. Figure 17 As shown, the corners or welds at the anchoring bottom 221 are covered or shielded, so that when the anchor 22 and the push rod 24 are withdrawn into the sheath, the corners or welds will not scrape or hook against the inner wall of the blood vessel. The distal end surface of the push rod 24 is in contact with the anchoring bottom 221. At this time, the anchor 22 and the push rod 24 can be regarded as the same cylinder without transition, as shown in FIG. Figure 17 As shown, the end surface of the distal end of the push rod 24 is a transitional smooth arc surface.

[0067] Example 3

[0068] like Figure 18-19 As shown, the conveyor of this embodiment differs from the first embodiment in that the anchor member 32 is three-dimensional, specifically, a three-dimensional multi-claw type. The anchor member 32 includes an anchor base 321, a connection seat 323 fixed to the anchor base 321, and an anchor portion 322 extending distally from the connection seat 323. The anchor portion 322 comprises a plurality of claws evenly distributed circumferentially around the sheath core 33.

[0069] The receiving portion 343 is provided with a cylindrical cavity 3431 with an opening toward the distal end. The cavity opening faces the anchor 32. The outer diameter of the push rod 34 is larger than the outer diameter of the anchor 32, and the inner diameter of the cylindrical cavity is larger than or equal to the outer diameter of the anchor 32. When the push rod 34 is pushed to the anchor 32, the anchor 32 can be entirely accommodated in the cavity, thereby achieving full coverage of the entire anchor 32. Figure 19 When the anchor 32 and the push rod 34 are withdrawn into the sheath, the anchor 32 as a whole is not exposed, and the corners or welds of the anchor 32 will not scrape or get caught on the inner wall of the blood vessel.

[0070] The distal end of the push rod 34 is conical, which can effectively reduce the resistance of the push rod 34 to advance and reduce the scraping between the push rod 34 and the inner wall of the blood vessel. The distal end surface is a smoothly transitioned arc surface, which can avoid unnecessary damage to the blood vessel.

[0071] The present invention provides a conveyor and a conveying system. By providing a receiving portion at the distal end of the push rod of the conveyor, when the conveyor is retracted, the portion of the anchor member that is easily scratched or hooked with the blood vessel wall is first received in the receiving portion and then retracted together, thereby solving the problem of difficulty in retracting the conveyor caused by the welding area or the anchor bottom of the anchor member being easily scratched or hooked with the blood vessel.

[0072] It is understandable that the delivery device claimed for protection in this application can also be used to deliver other medical devices such as left atrial appendage occluders, atrial septal defect occluders, filters, etc. according to actual needs, and is not limited to the coated stent in this application.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A delivery device for delivering an implant, comprising a sheath core, a guide head, and an anchor, wherein the guide head is located at the distal end of the sheath core, and the anchor is located on the sheath core and close to the proximal end of the guide head, characterized in that: The anchoring member includes an anchoring bottom and an anchoring portion extending from the anchoring bottom to the distal end, the conveyor also includes a push rod sleeved on the sheath core and movable axially relative to the sheath core, the distal end of the push rod is provided with a receiving portion, the receiving portion includes a receiving groove opening toward the anchoring member, the receiving groove is an embedding groove adapted to the anchoring bottom, the outer diameter of the push rod is greater than or equal to the outer diameter of the anchoring member; a first handle is fixed to the proximal end of the push rod and the first handle is coaxially sleeved on the sheath core, the conveyor also It includes a sheath coaxially sleeved on the push rod and capable of axially moving relative to the push rod, a second handle is fixed to the proximal end of the sheath, and the second handle is coaxially sleeved on the push rod. When the conveyor completes the release of the implant and is ready to withdraw, the distance between the distal end of the first handle and the proximal end of the second handle is defined as L1, and the distance between the distal end of the receiving portion and the distal end of the anchoring bottom is defined as L2. Then L1 and L2 satisfy: L1≥L2, so that the push rod can be pushed forward to the receiving groove to accommodate the anchor.

2. The conveyor according to claim 1, characterized in that The anchor is U-shaped, and the opening of the anchor faces the distal end of the conveyor. Part of the side surface of the receiving groove is provided with at least one cutout opening toward the distal end of the conveyor, so that the receiving groove is connected to the outside.

3. The conveyor according to claim 2, characterized in that The proximal end of the push rod is provided with a first handle, and the first handle is coaxially sleeved on the sheath core, the proximal end of the sheath core is exposed from the proximal end of the first handle, and the proximal end of the sheath core and the first handle are respectively provided with orientation marks.

4. The conveyor according to claim 1, characterized in that The anchoring member is in a three-dimensional multi-claw shape, and the opening of the anchoring member faces the distal end of the conveyor.

5. The conveyor according to claim 1, characterized in that The anchor is three-dimensional, and the opening of the anchor faces the distal end of the conveyor. The receiving groove is a cavity facing the anchor, and the inner diameter of the cavity is greater than or equal to the outer diameter of the anchor.

6. The conveyor according to claim 5, characterized in that The distal end portion of the push rod includes a tapered end.

7. The conveyor according to claim 1, characterized in that The distal end of the push rod comprises a smooth arc surface.

8. The conveyor according to claim 7, characterized in that The distal end surface of the push rod is coated with a hydrophilic coating.

9. The conveyor according to claim 8, characterized in that The first handle includes a first shell, a first handle end cover and a fastener. The first shell is fixedly connected to the proximal end of the push rod. The first handle end cover is located at the proximal end opening of the first shell. The fastener is controlled by the first handle end cover to fix the push rod relative to the sheath core.

10. The conveyor according to claim 1, wherein A stop mark is also provided on the sheath core.

11. A conveying system, characterized in that: The conveying system comprises a conveyor as described in any one of claims 1 to 10, wherein the conveying system further comprises an implant, and the implant is hooked on the anchor.

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