CN117281570A - Conveying device and conveying system for conveying vascular stents - Google Patents

Abstract

The invention provides a conveying device and a conveying system for conveying a vascular stent. The bundle diameter guide wire is used for penetrating into the binding group of the vascular stent so as to bind the vascular stent on the periphery of the outer sheath core assembly through the binding group. After the conveying device drives the vascular stent to move at the lesion in the blood vessel, the bundle diameter guide wire is sequentially separated from the limiting hole and the binding group from the far end to the near end along the axial direction, so that the binding band group releases the binding of the vascular stent, the vascular stent expands along the radial direction and clings to the wall of the aneurysm, and a channel for normal blood circulation is established. When the restraint group is worn to locate by the restraint footpath seal wire, the distal end of restraint footpath seal wire wears to locate in conveyor's the spacing downthehole to the distal end of spacing restraint footpath seal wire avoids the distal end perk of restraint footpath seal wire, thereby can effectually avoid the distal end of restraint footpath seal wire to cause the damage to vessel support and vascular tissue.

Description

Conveying device and conveying system for conveying vascular stents

Technical Field

The invention relates to the field of medical equipment, in particular to a conveying device and a conveying system for conveying a vascular stent.

Background

Aortic disease is a cardiovascular disease seriously threatening human life and health, and clinically mainly manifests as aortic dissection, aortic aneurysm and the like. The human aorta is classified according to anatomical morphology, and is mainly classified into the following categories: the ascending aorta, aortic arch, descending aorta and abdominal aorta, which are diseased due to various pathological causes, such as advanced age and hypertension, atherosclerosis, hereditary angiopathy, local infection or trauma of the aorta, etc., wherein hypertension is the main cause of aortic disease occurrence of patients in China, and about 50.1% -75.9% of aortic dissection/aortic aneurysm patients have history of hypertension. In addition, the incidence of this disease increases with age, possibly associated with abnormal vascular wall structure as the age increases.

Treatment of aortic disease is generally divided into two modes, one being surgery and the other being endoluminal intervention. The aortic cavity interventional operation has the advantages of small trauma to patients, high safety, short operation time, quick postoperative recovery and the like, so that the aortic cavity interventional operation becomes a main means for treating aortic diseases. The endovascular intervention operation is to convey the vascular stent to the lesion through a conveying device, then release the vascular stent, isolate the blood flow from the lesion after the vascular stent is self-expanded, thereby eliminating the impact of the blood flow on the aneurysm wall of the lesion and establishing a channel for normal blood circulation.

In the related art, the implanted stent is bound by the bundle-diameter guide wire to be radially compressed, so that the implanted stent is conveniently accommodated in a sheath tube of the conveying device in a compressed state, and the implanted stent can automatically return to a preset shape after being released from the sheath tube. However, during the release of the implanted stent, the bundle-diameter guide wire can cause damage to the inner wall of the blood vessel to cause postoperative complications.

Disclosure of Invention

The invention aims to provide a conveying device which can effectively avoid damage to the inner wall of a blood vessel caused by a bundle diameter guide wire.

In order to solve the technical problems, the invention adopts the following technical scheme:

according to one aspect of the present invention, there is provided a delivery device for delivering a vascular stent, comprising an inner sheath-core assembly, an outer sheath, and a bundle-diameter guidewire; the inner sheath core component is provided with a limiting hole along the axial direction; the outer sheath core assembly is slidably sleeved on the periphery of the inner sheath core assembly; the outer sheath tube is slidably sleeved on the periphery of the outer sheath core assembly; an annular chamber is formed by a space between the inner periphery of the outer sheath tube and the outer periphery of the outer sheath core assembly; the vascular stent can be sleeved on the periphery of the outer sheath core assembly and can be accommodated in the annular cavity; the bundle diameter guide wire penetrates through the outer sheath tube; the restraint diameter guide wire is used for movably penetrating into a restraint group of the vascular stent so as to keep the restraint group from radially contracting the vascular stent; the distal end of the bundle diameter guide wire can be arranged in the limiting hole in a penetrating mode, and can be sequentially separated from the limiting hole and the binding group from the distal end to the proximal end of the conveying device along the axial direction.

In some embodiments of the present application, the inner sheath core assembly comprises an axially extending inner core tube, a tip secured to a distal end of the inner core tube, and an abutment protruding on an outer circumference of the inner core tube; the limiting hole is formed in the abutting piece.

In some embodiments of the present application, the distal end of the abutment and the proximal end of the tip have a spacing.

In some embodiments of the present application, the limiting hole axially penetrates through both ends of the abutment.

In some embodiments of the present application, the outer sheath core assembly includes an outer core tube slidably sleeved around the outer periphery of the inner core tube, and an anchor disc secured to the distal end of the outer core tube; the anchoring disc is provided with a positioning hole which is penetrated along the axial direction, and the distal end of the beam diameter guide wire is used for sequentially penetrating through the positioning hole and the limiting hole.

In some embodiments of the present application, the conveying device further comprises a support tube sleeved on the outer core tube, at least one through hole penetrating axially is formed in the support tube, and the distal end of the bundle diameter guide wire is used for penetrating through the through hole, the positioning hole and the limiting hole in sequence.

In some embodiments of the present application, the delivery device further comprises a pre-buried guide wire for axially slidably threading within the outer sheath; the outer peripheral wall of the anchoring disc is provided with a guide groove, the far end of the embedded guide wire is positioned outside the outer sheath tube and limited in the guide groove, and the embedded guide wire can be separated from the anchoring disc along the radial direction.

In some embodiments of the present application, the pre-buried guide wire is circumferentially disposed in plurality about an axis of the outer sheath-core assembly; the guide grooves are arranged in a plurality and correspond to the embedded guide wires one by one.

In some embodiments of the present application, a limiting groove is concavely formed in the peripheral wall of the tip, and the guiding groove and the limiting groove are used for locally limiting the pre-buried guide wire, and the pre-buried guide wire can be separated from the tip along the radial direction.

In some embodiments of the present application, at least two through holes penetrating along an axial direction are formed in the support tube, and the bundle diameter guide wire and the pre-buried guide wire are used for being respectively arranged in the two through holes in a penetrating mode.

According to one aspect of the present invention, there is provided a delivery system comprising a vascular stent, and a delivery device as described above; the vascular stent is sleeved on the periphery of the outer sheath core assembly; the vascular stent comprises a bare stent and a tectorial membrane connected to the peripheral side wall of the bare stent, and the proximal end of the bare stent is detachably connected to the distal end of the outer sheath core assembly; the vascular stent is provided with a plurality of binding groups for radially contracting the vascular stent.

According to the technical scheme, the invention has at least the following advantages and positive effects:

in the invention, the bundle diameter guide wire is used for being arranged in the binding group of the vascular stent in a penetrating way so as to bind the vascular stent on the periphery of the outer sheath core assembly through the binding group. After the conveying device drives the vascular stent to move at the lesion in the blood vessel, the bundle diameter guide wire is sequentially separated from the limiting hole and the binding group from the far end to the near end along the axial direction, so that the binding band group releases the binding of the vascular stent, the vascular stent expands along the radial direction and clings to the wall of the aneurysm, and a channel for normal blood circulation is established. When the restraint group is worn to locate by the restraint footpath seal wire, the distal end of restraint footpath seal wire wears to locate in conveyor's the spacing downthehole to the distal end of spacing restraint footpath seal wire avoids the distal end perk of restraint footpath seal wire, thereby can effectually avoid the distal end of restraint footpath seal wire to cause the damage to vessel support and vascular tissue.

Drawings

Fig. 1 is a schematic diagram of a conveyor system embodiment of the present invention.

Fig. 2 is a schematic structural view of a stent of the present invention.

Fig. 3 is an enlarged view at a in fig. 1.

Fig. 4 is a schematic view of a conveyor apparatus according to an embodiment of the present invention.

Fig. 5 is a schematic view of another view of a conveyor according to an embodiment of the present invention.

Fig. 6 is a schematic view of the structure of the inner sheath-core assembly of an embodiment of the delivery device of the present invention.

Fig. 7 is a schematic view of the structure of the sheath-core assembly of the delivery device embodiment of the present invention.

Fig. 8 is a schematic view showing the structure of a support tube of an embodiment of the conveying apparatus of the present invention.

Fig. 9 is a schematic view showing the structure of the use state of the embodiment of the conveying device of the present invention.

The reference numerals are explained as follows: 100. a vascular stent; 110. a bare stent; 120. coating a film; 130. a wire loop; 140. a window; 200. a conveying device; 210. an inner sheath core assembly; 211. an inner core tube; 212. an end head; 2121. a tip body; 2122. a first boss; 2123. a second boss; 2124. a first step surface; 2125. a second step surface; 213. an abutment; 214. a limit groove; 215. a limiting hole; 220. an outer sheath core assembly; 221. an outer core tube; 222. an anchor disc; 2221. an anchor body; 2222. a limit claw; 224. positioning holes; 225. a guide groove; 230. a bundle diameter guide wire; 240. pre-burying a guide wire; 250. an outer sheath; 260. a support tube; 261. and (5) perforating.

Detailed Description

In the interventional medical field, the end of the delivery device that is closer to the operator is often referred to as the proximal end, while the end that is farther from the operator is referred to as the distal end; for a stent, the proximal end refers to the end of the stent that is closer to the heart of the human body after the stent is used for interventional therapy, and the distal end refers to the end of the stent that is farther from the heart of the human body after the stent is used for interventional therapy.

Fig. 1 is a schematic diagram of a conveyor system embodiment of the present invention.

The delivery system of the present invention comprises a vascular stent 100 and a delivery device 200 for delivering the vascular stent 100; the stent 100 is housed in the delivery device 200. The delivery device 200 may implant the stent 100 into a vascular target site, and the stent 100 expands radially within the vascular target site, thereby isolating blood flow from the lesion and establishing a path for normal blood circulation.

Fig. 2 is a schematic structural view of a stent of the present invention.

Referring to fig. 1 and 2, the vascular stent described in the present application is a covered vascular stent, but the application range of the delivery device of the present application is not limited to a covered vascular stent, and may be used for a bare stent without a covering film. For convenience of description, the present embodiment is exemplified by the stent graft 200 shown in fig. 2, and is not limited in terms of the structure and type of the stent graft.

In this embodiment, the vascular stent 100 includes a bare stent 110, and a cover film 120 attached to a circumferential side wall of the bare stent 110.

In this embodiment, the bare stent 110 is capable of expanding in the radial direction and drives the covering film 120 to expand in the radial direction. The bare stent 110 is made of a material having good biocompatibility, including, but not limited to, one or more of nickel-titanium alloy, nickel-titanium superelastic alloy, cobalt-chromium-nickel-molybdenum alloy, copper-based shape memory alloy, iron-based shape memory alloy, medical stainless steel alloy, or various polymers (e.g., polynorbornene, polyurethane, polylactic acid copolymer, etc.), etc. The cover film 120 is made of a material having good biocompatibility, including but not limited to woven or knitted polyesters such as polyethylene terephthalate, polylactide, polyglycolide, and copolymers thereof; fluorinated polymers such as polytetrafluoroethylene, expanded or electrospun polytetrafluoroethylene and polyvinylidene fluoride; polysiloxanes such as polydimethylsiloxane; polyurethanes, such as polyether polyurethanes, polyurethaneureas, polyether polyurethaneureas, polyurethanes containing carbonate linkages, woven nickel titanium containing silicone segments, and polyurethanes; silicone, ultra high molecular weight polyethylene, or other suitable materials.

The bare stent 110 comprises a plurality of wavy rings which are arranged along the axial direction of the covering film 120 and make the vascular stent 100 be cylindrical as a whole. Each waveform ring is annular and comprises a plurality of supporting rods which are connected in sequence in an angle. By "angularly connected" is meant interconnected and forming an included angle greater than 0 degrees and less than 180 degrees. The plurality of support rods are connected in sequence to form a wave form with undulation, so that the wavy ring can be contracted or expanded in the radial direction better. Among the angles formed by any two adjacent support bars in each ring of the wavy annular object, the angle near the proximal end of the vascular stent 100 forms a wave crest and the angle near the distal end of the vascular stent 100 forms a wave trough.

One of the loops is located at the proximal end of the membrane 120, and for ease of description, the loop located at the proximal end of the membrane 120 is designated as the support loop. The troughs of the support ring are fixedly connected to the distal side of the membrane 120, the peaks of the support ring are located on the proximal side of the membrane 120, i.e. the peaks of the support ring extend beyond the proximal end of the membrane 120, the peaks of the support ring being further from the proximal end of the membrane 120 than the troughs thereof.

The wavy annular objects are of cylindrical structures, and the wavy annular objects with multiple circles can have the same or similar wavy shape; for example, the wavy annulus may be a Z-wave, M-wave, V-wave, U-wave, sine wave, or other radially compressible structure, etc. It is understood that the embodiment is not limited to the specific structure of the wavy annular object, the wavy form of the wavy annular object can be set according to the requirement, and the number of wavy forms in each circle of wavy annular object and the height of the wavy form can be set according to the requirement. In actual preparation, the bare stent 110 may be formed by braiding nickel-titanium wires or cutting nickel-titanium tubes, and then the covering film 120 is fixed on the bare stent 110 by stitching or high-temperature pressurizing on the surface of the bare stent 110.

Fig. 3 is an enlarged view at a in fig. 1.

Referring to fig. 1 to 3, the binding sets are disposed on the covering film 120, and in this embodiment, two binding sets are disposed on the covering film 120 for illustration, and the number of the binding sets is not limited. The two binding sets are spaced apart along the axial direction of the cover film 120. The binding set includes at least two wire loops 130, and in this embodiment, the binding set includes two wire loops 130 is illustrated, and the number of wire loops 130 is not limited. The two wire loops 130 are disposed along the circumferential direction of the covering film 120, one end of the wire loop 130 is fixedly connected to the bare stent 110, and the other end of the wire loop 130 is a free end. The two wire loops 130 in the same binding set are close to each other in the circumferential direction of the stent 100 and the free ends of the two wire loops 130 are made to snap-connect to each other, thereby forming a binding band binding the stent 100. In other embodiments, the wire loop 130 may be fixedly connected to the covering film 120, or the wire loop 130 may be fixedly connected to both the bare stent 110 and the covering film 120.

The covering film 120 is provided with a window 140, and the window 140 penetrates through the covering film 120 along the radial direction; the window 140 is used for plugging a branch stent (not shown in the figure) for reconstructing a branch vessel. In this embodiment, the window 140 is provided as one. In some embodiments, the windows 140 are provided in plurality along the circumference of the cover film 120.

Fig. 4 is a schematic view of a conveyor apparatus according to an embodiment of the present invention. Fig. 5 is a schematic view of another view of a conveyor according to an embodiment of the present invention.

Referring to fig. 1-5, the delivery device 200 includes an inner sheath-core assembly 210, an outer sheath-core assembly 220, a bundle guide wire 230, a pre-buried guide wire 240, an outer sheath 250, and a handle assembly (not shown). The outer sheath core assembly 220 is slidably sleeved on the outer periphery of the inner sheath core assembly 210 along the axial direction, the outer sheath tube 250 is slidably sleeved on the outer periphery of the outer sheath core assembly 220, and the bundle diameter guide wire 230 and the embedded guide wire 240 are movably sleeved in the outer sheath tube 250 along the axial direction.

The outer sheath 250 has a space between its inner circumference and the outer circumference of the outer sheath core assembly 220 to form an annular chamber within which the radially contracted stent 100 is received. Specifically, the vascular stent 100 is configured to be sleeved on the outer periphery of the outer sheath core assembly 220, and the free ends of the two wire loops 130 in the same binding group are pulled along the circumferential direction of the vascular stent 100 and in opposite directions until the free ends of the two wire loops 130 are close to each other to form a binding band encircling the vascular stent 100, overlapping perforations are formed on the free ends of the two wire loops 130 in the same binding group in the axial direction, and the bundle diameter guide wire 230 is movably arranged in the perforations formed by the two wire loops 130 in the same binding group, so that the two wire loops 130 in the same binding group are movably connected, and the wire loops 130 bind the vascular stent 100 on the outer periphery of the outer sheath core assembly 220, thereby realizing radial contraction of the vascular stent 100. Pulling the wire guide 230 out of the perforation formed by the two wire loops 130 in the same set of constraining groups unlocks the stent 100, allowing the stent 100 to self-expand to return to the pre-set configuration. The support ring of the vascular stent 100 is movably coupled to the outer sheath-core assembly 220. The inner sheath core assembly 210 and the outer sheath core assembly 220 are provided with a lumen which is penetrated along the axial direction, the lumen is used for the guide wire to penetrate, and the guide wire is used for establishing an intravascular operation channel.

Puncturing a blood vessel at the arterial position of the human body, and establishing a surgical channel by using a guide wire; the delivery device 200 loaded with the vascular stent 100 is delivered along a guide wire to a vascular lesion site. The sheath 250 is then moved by the handle assembly such that the sheath 250 moves axially relative to the sheath-core assembly 220 toward the proximal end of the delivery device 200, exposing the vascular stent 100 to the blood vessel. And then the handle assembly drives the bundle diameter guide wire 230 to move towards the proximal end of the conveying device 200, and the bundle diameter guide wire 230 is separated from the wire ring 130, so that the restraint of the bundle diameter guide wire 230 to the vascular stent 100 is removed, the vascular stent 100 is released and self-expanded, the vascular stent 100 isolates blood flow from a lesion part, the impact of blood flow on the lesion part is eliminated, and a channel for normal blood circulation is established. Finally, the guidewire and delivery device 200 are retracted to complete the interventional procedure for the aneurysm or arterial dissection.

In this embodiment, the pre-buried guide wire 240 is inserted into the outer sheath 220 and the window 140 is inserted from the inside of the vascular stent 100, so as to lead the distal end of the pre-buried guide wire 240 out of the window 140 and to extend the distal end of the pre-buried guide wire 240 out of the distal end of the delivery device 200; when the delivery device 200 drives the stent 100 to move into the blood vessel, the pre-buried guide wire 240 also moves into the blood vessel, and the pre-buried guide wire 240 is moved, so that the distal end of the pre-buried guide wire 240 extends into the branch blood vessel from the window 140 via the inner cavity of the stent 100. Upon withdrawal of the delivery device 200 from the blood vessel, the pre-buried guide wire 240 is left in the body without being withdrawn with the delivery device 200. The pre-buried guide wire 240 left in the human body serves as a guide wire for the branch vessel, so that the branch stent for reconstructing the branch vessel can be moved into the branch vessel along the pre-buried guide wire 240 to reconstruct the branch vessel.

Fig. 6 is a schematic view of the inner sheath-core assembly 210 of an embodiment of the delivery device of the present invention.

Referring to fig. 1 to 6, the inner sheath core assembly 210 includes an inner core tube 211 extending in an axial direction, a tip 212 fixed to a distal end of the inner core tube 211, and an abutment 213 protruding on an outer circumference of the inner core tube 211. The inner core tube 211 is a tubular structure provided with a lumen. The end 212 is hollow, and the end 212 is provided with an inner cavity which axially penetrates through two ends. The lumen of the inner core tube 211 communicates with the lumen of the tip 212 and together serves as a passage for the guide wire. The abutment 213 is located on the proximal end side of the tip 212, and the abutment 213 is provided on the outer periphery of the inner core tube 211 around the axis periphery of the inner core tube 211.

In this embodiment, the inner core tube 211 is generally made of a polymer, a metal tube or a hollow steel cable with good flexibility, so that the inner core tube 211 can adapt to a certain bending, thereby being delivered in a blood vessel according to the shape of the blood vessel. The abutment 213 is generally made of metal or other polymer materials. The abutment 213 is fixed to the outer circumference of the inner core tube 211 by welding or bonding, etc., and the tip 212 is formed on the inner core tube 211 by an injection molding process, so that the inner sheath-core assembly 210 is formed as a whole. In some embodiments, the tip 212 and the inner core tube 211 are fused together.

The outer circumference of the tip 212 is tapered in a diameter in the proximal-distal direction of the delivery device 200 to facilitate movement of the tip 212 within the vessel. The outer circumference of the end 212 is concavely provided with a limit groove 214, one side of the limit groove 214 along the radial direction and opposite to the central axis of the end 212 is opened, two ends of the limit groove 214 along the axial direction are penetrated, and the extending direction of the limit groove 214 is parallel to the axial direction of the end 212. The limiting groove 214 is used for limiting the pre-buried guide wire 240 penetrating through the outer sheath 220, and can be separated from the pre-buried guide wire 240. The embedded guide wire 240 is limited in the limiting groove 214 and can be moved out of the limiting groove 214 along the axial direction so as to be separated from the end 212 along the axial direction; meanwhile, the limiting groove 214 plays a role in accommodating the pre-buried guide wire 240, and is beneficial to reducing friction between the pre-buried guide wire 240 and the vascular wall. The limiting groove 214 can also be used for draining water, which is used for communicating with the space where the stent 100 is located in order to drain the saline for the evacuation operation of the stent 100.

It should be noted that, the specific structure of the limiting groove 214 is not limited in this embodiment, as long as the pre-buried guide wire 240 is ensured to be bound on the end 212, and the pre-buried guide wire 240 can be separated from the end 212 under the action of external force. For example, in other embodiments, the limiting groove 214 is a clamping mechanism composed of two elastic pieces, the two elastic pieces are disposed on the end 212, the pre-buried guide wire 240 is clamped between the two elastic pieces, and the pre-buried guide wire 240 is separated from the two elastic pieces under the action of external force.

In this embodiment, the limiting groove 214 is disposed on the end 212 to correspond to an embedded guide wire 240. In some embodiments, the spacing grooves 214 are distributed around the circumference of the tip 212 in a plurality on the outer circumference of the tip 212 to correspond to a plurality of pre-buried guide wires 240.

Tip 212 includes a tip body 2121, a first boss 2122, and a second boss 2123; first boss 2122 is fixedly coupled to a proximal end of tip body 2121 and second boss 2123 is fixedly coupled to a proximal end of first boss 2122. Head body 2121, first boss 2122 and second boss 2123 are circular or oval in cross-section, and head body 2121, first boss 2122 and second boss 2123 are coaxially disposed. The cross-section of the first boss 2122 is larger than the cross-section of the second boss 2123 such that the first boss 2122 and the second boss 2123 form a first stepped surface 2124; the cross-section of first boss 2122 is smaller than the cross-section of the proximal end of the tip body such that first boss 2122 and tip body 2121 form a second stepped surface 2125. The length of stop slot 214 extends from the proximal end of second boss 2123 toward the distal end of tip body 2121. When the delivery system is assembled, the outer sheath 250 is sleeved around the outer periphery of the outer sheath core assembly 220, and the distal end of the outer sheath 250 abuts the second stepped surface 2125.

In particular embodiments, the outer diameter of the proximal face of tip body 2121 is the same as the outer diameter of outer sheath 250, and the engagement of tip body 23121 with the outer sheath is smooth, facilitating smooth movement of the delivery device within the vessel, facilitating positioning of outer sheath 250, and thus facilitating quick installation of the delivery system.

There is a space between the distal end of the abutment 213 and the proximal end of the first boss 2122. In this embodiment, the distance between the distal end of the abutment 213 and the proximal end of the first boss 2122 is about 1.5-2.5mm. When the stent 100 is hooked on the sheath-core assembly 220, the proximal end of the support ring at the proximal end of the stent 100 moves toward the central axis of the abutment 213, and the gap between the abutment 213 and the first boss 2122 has the effect of receiving the proximal end of the support ring.

In the related art, the implanted stent is bound by the bundle-diameter guide wire to be radially compressed, so that the implanted stent is conveniently accommodated in a sheath tube of the conveying device in a compressed state, and after the implanted stent is released from the sheath tube, the implanted stent can automatically return to a preset shape. However, in the practical use process, the damage to the inner wall of the blood vessel is found in the process of releasing the implanted stent, and research shows that the damage to the inner wall of the blood vessel is easily caused by the exposed-state wire harness because the distal end of the wire harness which radially contracts the implanted stent is in an exposed state.

For this reason, in the present embodiment, the abutment 213 is provided with a limiting hole 215, the limiting hole 215 extends along the axial direction of the tip, and the distal end of the bundle diameter guide wire 230 is disposed in the limiting hole 215. The limiting hole 215 axially penetrates through two ends of the abutting piece 213, and the distal end of the beam diameter guide wire 230 penetrates out of the limiting hole 215 and abuts against the abutting piece 213. In some embodiments, the stop hole 215 does not extend through the distal end of the abutment 213, and the end of the distal end of the wire harness guide 230 is positioned within the stop hole 215.

The bundle diameter guide wire 230 is arranged in the outer sheath 250 in a penetrating manner, and the distal end is arranged in the limiting hole 215 in a penetrating manner, so that the relative movement of the inner sheath core assembly 210 and the outer sheath core assembly 220 in the circumferential direction can be limited, the integrity and stability of the inner sheath core assembly 210 and the outer sheath core assembly 220 are stronger, the positioning process of the vascular stent 100 in an operation is more stable, and the pre-buried guide wire 240 is effectively prevented from being distorted and deformed between the inner sheath core assembly 210 and the outer sheath core assembly 220. The distal end of the bundle diameter guide wire 230 is inserted into the limiting hole 215 of the conveying device 200 to limit the distal end of the bundle diameter guide wire 230, so that the distal end of the bundle diameter guide wire 230 is prevented from being tilted, and the damage to the vascular stent 100 and vascular tissues caused by the distal end of the bundle diameter guide wire 230 can be effectively avoided.

In some embodiments, the limiting hole 215 is formed at the distal end of the outer sheath core assembly 220, and the distal end of the bundle diameter wire 230 is inserted into the limiting hole 215, so that the distal end of the bundle diameter wire 230 can be prevented from being tilted.

Fig. 7 is a schematic view of the structure of the sheath-core assembly of the delivery device embodiment of the present invention.

Referring to fig. 1 to 7, the outer sheath core assembly 220 is slidably sleeved on the outer periphery of the inner sheath core assembly 210, and can circumferentially rotate around the inner sheath core assembly 210; and the outer sheath-core assembly 220 can be separated from the inner sheath-core assembly 210. The outer sheath core assembly 220 includes an outer core tube 221 slidably fitted around the outer periphery of the inner core tube 211, and an anchor disc 222 fixed to the distal end of the outer core tube 221.

In this embodiment, the anchor disc 222 includes an anchor body 2221 fixedly sleeved on the outer periphery of the outer core tube 221, and a plurality of limiting pawls 2222 extending from the anchor body 2221 toward the distal end of the anchor disc 222, wherein the plurality of limiting pawls 2222 are uniformly distributed on the anchor body 2221 around the circumferential direction of the anchor body 2221. The anchoring body 2221 and the plurality of stop pawls 2222 may be integrally formed or may be connected by welding.

The limiting claws 2222 are arranged at intervals in the circumferential direction of the anchoring body 2221, and each peak on the supporting ring at the proximal end of the vascular stent 100 is detachably connected to each limiting claw 2222, and each limiting claw 2222 is correspondingly connected to a peak of one supporting ring, so that the distal end of the vascular stent 100 is limited on the anchoring disc 222. When the outer sheath core assembly 220 is mounted on the inner sheath core assembly 210, the distal end of the limiting claw 2222 abuts against the first step surface 2124 on the inner sheath core assembly 210 to limit the relative positions of the inner sheath core assembly 210 and the outer sheath core assembly 220, so that the inner sheath core assembly 210 and the outer sheath core assembly 220 can be assembled quickly and accurately.

In this embodiment, the anchor disc 222 is provided with a positioning hole 224 that is penetrated along the axial direction, the positioning hole 224 is disposed corresponding to the limiting hole 215, and after the inner sheath core assembly 210 and the outer sheath core assembly 220 are assembled, the axes of the positioning hole 224 and the limiting hole 215 are coincident. The distal end of the bundle diameter guide wire 230 sequentially passes through the positioning hole 224 and the limiting hole 215, so that the stability of the positions of the vascular stent 100 and the inner sheath core assembly 210 on the outer sheath core assembly 220 assembly in the circumferential direction is ensured, and the stability of the relative positions of the window 140 on the vascular stent 100 and the limiting groove 214 on the end 212 in the circumferential direction can be effectively ensured. The positioning holes 224 are formed in the anchor body 2221 and penetrate through both ends of the anchor body 2221 in the axial direction of the anchor disc 222.

In this embodiment, the bundle diameter guide wire 230 is provided as one, and the limiting hole 215 and the positioning hole 224 are respectively provided as one. In some embodiments, the bundle diameter guidewire 230 is disposed in a plurality at circumferentially spaced intervals around the inner sheath-core assembly 210; the limiting holes 215 and the positioning holes 224 are respectively provided with a plurality of limiting holes and correspond to the beam diameter guide wires 230 one by one.

The outer circumference of the anchor disc 222 is provided with a guiding groove 225 corresponding to the limiting groove 214. The guide groove 225 is opened on the outer circumference of the anchor body 2221 and is located between the adjacent two limit claws 2222. The embedded guide wire 240 is threaded through the guide groove 225 along the axial direction of the anchor disc 222, and the guide groove 225 is used for accommodating the local embedded guide wire 240 passing through the anchor disc 222, so that the embedded guide wire 240 is prevented from protruding out of the anchor body 2221 after the distal end of the embedded guide wire 240 is threaded through the end head 212. The guide groove 214 is beneficial to reducing the space occupied by the embedded guide wire 240 in the annular chamber, so that the conveying device 200 with smaller size can be arranged to convey the vascular stent 100, and the conveying device 200 can be conveniently moved in the blood vessel.

In this embodiment, the pre-buried guide wire 240 and the guide groove 225 are provided in one corresponding manner. In some embodiments, the pre-buried guide wire 240 is provided in plurality around the circumference of the outer sheath-core assembly 220; the guide grooves 225 are provided in plurality and correspond to the pre-buried guide wires 240 one by one.

In this embodiment, the anchor disc 222 is made of a metal material to secure structural strength of the anchor disc 222. The outer core tube 221 is made of a polymer tubing or a metal tube or a hollow wire rope with good flexibility, so that the outer core tube 221 can conform to a certain bending for intravascular delivery. The anchor disc 222 and the outer core tube 221 are connected together by welding or bonding.

Fig. 8 is a schematic view showing the structure of a support tube of an embodiment of the conveying apparatus of the present invention.

Referring to fig. 1 to 8, the delivery device 200 further includes a support tube 260, the support tube 260 is slidably sleeved on the outer periphery of the outer core tube 221, the support tube 260 can rotate circumferentially around the outer core tube 221, and the support tube 260 is located in the outer sheath tube 250. When the stent 100 is disposed on the outer core tube 221, the support tube 260 is located at the distal end side of the stent 100, and the distal end of the support tube 260 is used to contact the proximal end of the stent 100, thereby functioning to support the stent 100. During the release of the stent 100, the stability of the stent 100 is ensured due to the pushing action of the distal end of the support tube 260 on the distal end of the stent 100.

The support tube 260 is provided with a through hole 261 penetrating along the axial direction of the support tube 260, and the harness guide wire 230 is inserted through the through hole 261 and is inserted into the support tube 260.

When only one bundle-diameter guide wire 230 is provided and no pre-buried guide wire 240 is provided on the conveying device 200, one through hole 261 is provided, the through hole 261 and the corresponding positioning hole 224 are coaxially provided, and the bundle-diameter guide wire 230 is inserted into the through hole 261.

When only a plurality of bundle-diameter guide wires 230 are provided on the conveying device 200 and when no pre-buried guide wires 240 are provided, a plurality of through holes 261 and positioning holes 224 are provided correspondingly.

In this embodiment, only one bundle diameter guide wire 230 and one pre-buried guide wire 240 are provided on the conveying device 200, two through holes 261 are provided on the support tube 260, and one through hole 261 corresponds to the guide groove 225; the pre-buried guide wire 240 and the bundle diameter guide wire 230 are respectively arranged in the two through holes 261 along the axial direction. The bundle diameter guide wire 230 and the embedded guide wire 240 are penetrated in the corresponding through holes 261, so that the arrangement of the bundle diameter guide wire 230 and the embedded guide wire 240 along the axial direction is more stable. The bundle guide wire 230 and the pre-buried guide wire 240 are respectively inserted into the corresponding through holes 261 so as to be slidable in the axial direction.

Fig. 9 is a schematic view showing the structure of the use state of the embodiment of the conveying device of the present invention.

Referring to fig. 1 to 9, the pre-buried guide wire 240 is axially inserted into the vascular stent 100; the distal end of the pre-buried guide wire 240 passes out of the interior of the vascular stent 100 through the window 140 to the exterior of the vascular stent 100 in a distal direction from the proximal end of the delivery device 200.

In this embodiment, the pre-buried guide wire 240 is inserted into a through hole 261 from the distal end of the support tube 260, then is inserted out from the distal end of the through hole 261, passes through the vascular stent 100 through the window 140 after passing through the inside of the vascular stent 100, and sequentially passes through the guide groove 225 and the limit groove 214 toward the distal end of the delivery device 200. In one particular embodiment, the length of the pre-buried guide wire 240 distally beyond the tip 212 is 1.6-2.0 m.

In a specific embodiment, taking the operation of reconstructing the left subclavian artery as an example, the femoral artery-left subclavian artery-brachial artery channel is established before the operation, and then the vascular stent 100 is released and the delivery device 200 is withdrawn with the aid of the medical imaging device, but the pre-buried guide wire 240 is still left in the human body and is not withdrawn together with the delivery device 200. Because the pre-buried guide wire 240 passes through the lumen of the stent 100 in advance when the stent 100 is assembled, and is then led out of the window 140 of the stent 100. Therefore, the pre-buried guide wire 240 remained in the human body at this time is used as a guide wire of a branch vessel, so that the branch stent can be conveniently guided into the human body along with the pre-buried guide wire 240, and the release of the branch stent is completed and the operation is completed under the assistance of medical imaging equipment.

In this embodiment, the wire 230 is threaded into a through hole 261 from the distal end of the support tube 260 and then out of the distal end of the through hole 261 and outside the stent 100. The bundle guide wire 230 is threaded distally with a plurality of wire loops 130, positioning holes 224 and limiting holes 215 formed by the constraining groups. When the vascular stent 100 is released, the bundle diameter guide wire 230 is pulled towards the proximal end of the conveying device 200, so that the bundle diameter guide wire 230 is separated from the wire ring 130 formed by the corresponding binding group from the distal end of the conveying device 200 to the proximal end in sequence, the vascular stent 100 is released more stably, and the impact on the blood vessel in the release process of the vascular stent 100 is reduced.

In this embodiment, the bundle diameter guide wire 230 is inserted into the wire loop 130 formed by the plurality of binding groups, so that the vascular stent 100 is bound to the outer periphery of the outer core tube 221 through the wire loop 130, and the vascular stent 100 is more stably located in the annular cavity. After the delivery device 200 drives the vascular stent 100 to move to the lesion in the blood vessel, the bundle diameter guide wire 230 is sequentially separated from the limiting hole 215 and the wire ring 130 along the axial direction from the distal end to the proximal end, so that the wire ring 130 releases the constraint on the vascular stent 100, the vascular stent 100 self-expands along the radial direction and clings to the vessel wall, and a channel for normal blood circulation is established. When the bundle diameter guide wire 230 is threaded through the wire loop 130, the distal end of the bundle diameter guide wire 230 is limited in the limiting hole 215 of the conveying device 200, so as to limit the distal end of the bundle diameter guide wire 230, and prevent the distal end of the bundle diameter guide wire 230 from warping, thereby effectively preventing the distal end of the bundle diameter guide wire 230 from damaging the vascular stent 100 and vascular tissues.

While the invention has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (11)

1. A delivery device for delivering a vascular stent, comprising:

the inner sheath core assembly is provided with a limiting hole along the axial direction;

an outer sheath core assembly slidably sleeved on the outer periphery of the inner sheath core assembly;

the outer sheath tube is sleeved on the periphery of the outer sheath core assembly in a sliding manner; an annular chamber is formed by a space between the inner periphery of the outer sheath tube and the outer periphery of the outer sheath core assembly; the vascular stent can be sleeved on the periphery of the outer sheath core assembly and can be accommodated in the annular cavity; and

the bundle diameter guide wire penetrates through the outer sheath tube; the restraint diameter guide wire is used for movably penetrating into a restraint group of the vascular stent so as to keep the restraint group from radially contracting the vascular stent; the distal end of the bundle diameter guide wire can be arranged in the limiting hole in a penetrating mode, and can be sequentially separated from the limiting hole and the binding group from the distal end to the proximal end of the conveying device along the axial direction.

2. The delivery device of claim 1, wherein the inner sheath-core assembly comprises an axially extending inner core tube, a tip secured to a distal end of the inner core tube, and an abutment protruding from an outer periphery of the inner core tube; the limiting hole is formed in the abutting piece.

3. The delivery device of claim 2, wherein a distal end of the abutment and a proximal end of the tip are spaced apart.

4. A delivery device as claimed in claim 3, wherein the limiting aperture extends axially through both ends of the abutment.

5. The delivery device of claim 2, wherein the outer sheath core assembly comprises an outer core tube slidably disposed around the outer periphery of the inner core tube, and an anchor disc secured to the distal end of the outer core tube; the anchoring disc is provided with a positioning hole which is penetrated along the axial direction, and the distal end of the beam diameter guide wire is used for sequentially penetrating through the positioning hole and the limiting hole.

6. The delivery device of claim 5, further comprising a support tube sleeved on the outer core tube, wherein the support tube is provided with at least one through hole passing through in an axial direction, and the distal end of the bundle-diameter guide wire is used for being sequentially arranged in the through hole, the positioning hole and the limiting hole in a penetrating manner.

7. The delivery device of claim 6, further comprising a pre-buried guide wire for axially slidably threading within the outer sheath; the outer peripheral wall of the anchoring disc is provided with a guide groove, the far end of the embedded guide wire is positioned outside the outer sheath tube and limited in the guide groove, and the embedded guide wire can be separated from the anchoring disc along the radial direction.

8. The delivery device of claim 7, wherein the pre-buried guide wire is circumferentially disposed in plurality about an axis of the outer sheath-core assembly; the guide grooves are arranged in a plurality and correspond to the embedded guide wires one by one.

9. The delivery device of claim 7, wherein a limiting groove is concavely formed in the outer peripheral wall of the tip, the guiding groove and the limiting groove are used for locally limiting the pre-buried guide wire, and the pre-buried guide wire can be separated from the tip in the radial direction.

10. The delivery device of claim 7, wherein at least two through holes are formed in the support tube, and the bundle guide wire and the pre-buried guide wire are respectively arranged in the two through holes in a penetrating manner.

11. A delivery system comprising a vascular stent and a delivery device according to any one of claims 1-10; the vascular stent is sleeved on the periphery of the outer sheath core assembly; the vascular stent comprises a bare stent and a tectorial membrane connected to the peripheral side wall of the bare stent, and the proximal end of the bare stent is detachably connected to the distal end of the outer sheath core assembly; the vascular stent is provided with a plurality of binding groups for radially contracting the vascular stent.