CN219021783U - Ilium artery bifurcation stent - Google Patents

Abstract

The application provides an iliac bifurcation stent comprising a main body stent for implantation within a common iliac artery vessel; an external iliac branch stent connected with the distal end of the main body stent and used for being planted in an external iliac artery vessel, an internal iliac branch stent arranged in the main body stent and an internal iliac artery vessel stent matched and connected with the internal iliac branch stent and used for being planted in the internal iliac artery vessel; at least part of the outer wall of the ilium embedded bracket along the axial direction is fixedly connected with the main body bracket; a first opening is formed in the side wall of the distal end of the main body support; the distal end of the ilium embedded bracket is provided with a second opening; the proximal end of the internal iliac artery stent is arranged in the second opening, and the distal end is used for being planted in the internal iliac artery vessel. By designing the arterial vessel stent as the internal main body stent, the fixation of the internal iliac artery vessel stent and the main body stent can be realized, and the internal iliac artery vessel stent can not be directly pressed by the vessel lumen, so that the internal iliac artery vessel stent can be completely opened, and the risk of occlusion caused by pressing is reduced.

Description

Ilium artery bifurcation stent

Technical Field

The application relates to the technical field of medical equipment, in particular to an iliac artery bifurcation stent.

Background

The common iliac arteries comprise common iliac arteries, external iliac arteries and internal iliac arteries, wherein the common iliac arteries are the final branches of the abdominal aorta, are divided into left and right common iliac arteries at the fourth lumbar body, run down the inner side of the lumbar muscle and are divided into internal iliac arteries and external iliac arteries at the sacroiliac joint. Arterial stents are mainly stents used in arterial vessels of the human body. An iliac bifurcation stent is a stent used at the iliac bifurcation.

The existing iliac artery bifurcation stent has the problems that the opening of an internal iliac artery is easy to be closed by a blood vessel, the internal iliac branch of a tortuous blood vessel is easy to be folded, the blockage is caused, and when the iliac artery bifurcation stent slightly moves and rotates in the operation process, the opening of the internal iliac branch faces to the outer side and is attached to the wall of the blood vessel, the opening of the internal iliac branch is blocked, and the like.

Disclosure of Invention

In view of this, the object of the present application is to propose an iliac bifurcation stent.

With the above objects in view, there is provided an iliac bifurcation stent comprising a main body stent for implantation in a common iliac artery vessel; an external iliac branch stent which is connected with the distal end of the main body stent and is used for being planted in an external iliac artery vessel, an internal iliac artery vessel stent which is arranged in the main body stent and is matched and connected with the internal iliac artery stent and is used for being planted in the internal iliac artery vessel;

wherein, at least part of the outer wall of the inner ilium embedded bracket along the axial direction is fixedly connected with the main body bracket; a first opening is formed in the side wall of the distal end of the main body support; the distal end of the ilium embedded bracket is provided with a second opening, and the second opening is arranged corresponding to the first opening; the proximal end of the internal iliac artery stent is arranged in the second opening, and the distal end is used for being implanted in an internal iliac artery vessel.

From the above, it can be seen that the iliac bifurcation stent provided herein is configured by providing a main body stent for implantation within the common iliac artery vessel; an external iliac branch stent which is connected with the distal end of the main body stent and is used for being planted in an external iliac artery vessel, an internal iliac artery vessel stent which is arranged in the main body stent and is matched and connected with the internal iliac artery stent and is used for being planted in the internal iliac artery vessel; a first opening is formed in the side wall of the distal end of the main body support in a matched mode; the distal end of the ilium embedded bracket is provided with a second opening, and the second opening is arranged corresponding to the first opening; the proximal end of the internal iliac artery stent is arranged in the second opening, the distal end is used for being planted in an internal iliac artery vessel, the internal iliac artery stent is designed to be a main body stent with built-in type, the fixed arrangement of the internal iliac artery stent and the main body stent can be realized, the internal iliac artery stent can not be directly pressed by a vessel lumen, and therefore the internal iliac artery stent can be fully opened, and the risk of occlusion caused by pressing of the internal iliac artery stent when the common iliac artery stenosis, serious common iliac artery distortion and common iliac artery calcification cause the common iliac artery vessel diameter to be smaller is greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a schematic view of the structure of an iliac bifurcation stent according to an embodiment of the present application after assembly;

FIG. 2 is a schematic view of the structure of the iliac bifurcation stent according to the embodiments of the present application prior to assembly;

FIG. 3 is a schematic cross-sectional view of an ilium inner stent in a body stent according to an embodiment of the present application;

FIG. 4 is a schematic view of yet another cross-sectional configuration of an ilium inner stent in a body stent according to an embodiment of the present application;

FIG. 5 is a schematic diameter view of an iliac bifurcation stent according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a transport system according to an embodiment of the present application;

fig. 7 is an enlarged view at F in fig. 6;

fig. 8 is a schematic view of the delivery system passing through the iliac embedded stent.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

The arterial stent mainly refers to a stent used in a human arterial vessel, and the stent can be generally made of a metal framework material and can provide a certain radial force to play a supporting role. The stent can be divided into a bare stent and a covered stent, wherein the covered stent refers to a layer of membranous material covered on a metal framework on the basis of the bare stent, so that blood cannot pass through a membrane, and the flowing direction of blood flow is limited.

Aneurysms are manifestations of limited or diffuse distension or distension of the arterial wall due to lesions or lesions of the arterial wall, primarily with distending, pulsating masses, which can occur anywhere in the arterial system, with iliac aneurysms specifically occurring at the iliac arteries. Iliac artery stenosis is one of the common arterial diseases of vascular surgery, mainly due to plaque or thrombus occluding the iliac artery, causing stenosis of the iliac artery.

20% -30% of patients with abdominal aortic aneurysm are accompanied by common iliac aneurysms or iliac expansions. The common iliac artery bifurcation stent is generally used in combination with a common iliac artery stent, and when the common iliac artery is diseased, such as is neoplastic or dilated, the presence of the common iliac artery bifurcation stent helps to maintain the internal iliac bifurcation free and establish an anchoring zone in the more distal external iliac vessel without adequate length to provide a distal anchoring zone for the common iliac artery. This avoids the associated side-effect diseases caused in the occluded ilium (such as gluteal necrosis, gluteal ischemic claudication or sexual dysfunction).

The iliac bifurcation stent is a covered stent used at the iliac bifurcation, and when the patient has lesions such as iliac aneurysm, iliac stenosis, etc., the iliac bifurcation stent is delivered to the iliac bifurcation by a delivery system for release. In one instance, the iliac bifurcation stent constrains blood flow within the stent from contact with the aneurysm wall, thereby reducing the risk of the aneurysm increasing to rupture as a result of continued impingement of blood flow. In another case, the radial force of the iliac bifurcation stent supports a stenosed vessel, expanding the vessel diameter at risk of occlusion, reducing the risk of arterial vessel occlusion. In such cases, the vessel may be forced against the stent's internal iliac branch due to the stenosis of the iliac artery, causing the internal iliac branch to deform, failing to achieve the desired effect.

In the related art, for lesions of the iliac artery stenosis, a balloon dilation catheter is generally used for pre-dilating a lesion part, and after the iliac artery stenosis is dilated by the balloon, a conveying system is used for placing an iliac artery bifurcation stent, so that the problems of complex flow, increased operation time and the like exist. And the structure of the support is generally that the internal iliac branch support is externally arranged, which can lead to: firstly, for the common iliac artery with the diameter of the blood vessel below 18mm, after the stent is completely released, the opening of the internal iliac artery is easy to be pressed and closed, so that the subsequent internal iliac artery selection cannot be successful, and the operation is limited by the diameter of the blood vessel; secondly, for patients with serious tortuosity of common iliac arteries, the internal iliac branch is easy to be folded, so that the internal iliac branch blood vessel is blocked and the like; thirdly, for overlong internal iliac branches, in the releasing process, the action of retracting the delivery sheath and pushing the stent upwards can cause the rotation of the bifurcated stent of the iliac artery, the opening of the internal iliac branch turns over to the outer vascular wall, and the opening is blocked, so that the subsequent internal iliac artery entering can not be successfully performed.

In view of this, this application embodiment provides a support structure of embedded in-iliac branch, through design in the in-iliac branch for main part support embeds, in-iliac branch can not receive the direct oppression of vascular lumen like this, in-iliac branch can open completely, can solve to a certain extent and use the sacculus to expand the complicated scheduling problem of flow that the pathological change position exists in advance, and in-iliac artery opening is easy to be pressed closed, in-iliac branch is easy to be discounted, in-iliac branch support takes place to rotate, in-iliac branch opening that in-iliac branch opening outwards arouses is closed, and in-iliac artery vascular support can't get into the problem such as in-iliac artery.

As shown in fig. 1, the iliac bifurcation stent provided by the embodiments of the present application may include a main body stent 3 for implantation within the common iliac vessel; an external iliac branch stent 1 which is connected with the distal end of the main body stent 3 and is used for being planted in an external iliac artery vessel, an internal iliac artery vessel stent 2 which is arranged in the main body stent 3 and an internal iliac artery vessel stent 4 which is matched and connected with the internal iliac artery vessel 2 and is used for being planted in the internal iliac artery vessel. It should be understood that the main body stent 3 may be understood as the portion of the iliac bifurcation stent implanted (i.e., placed) within the common iliac artery vessel. The external iliac branch stent 1 can be understood as a portion of the stent placed in the vessel of the external iliac artery of the human body in association with the external iliac artery in the bifurcated stent of the iliac artery. The iliac embedded stent 2 is understood to be that portion of the iliac bifurcation stent which is embedded within the main body stent 3. The internal iliac artery stent 4 is understood to be a part of the stent of the iliac artery bifurcation which branches from the main stent 3 and is located in the internal iliac artery vessel of the human body.

Wherein, at least part of the outer wall of the ilium embedded bracket 2 along the axial direction is fixedly connected with the main body bracket 3; a first opening is formed in the side wall of the distal end of the main body support 3; the distal end of the ilium embedded bracket 2 is provided with a second opening, and the second opening is arranged corresponding to the first opening; the proximal end of the internal iliac artery stent 4 is arranged in the second opening, and the distal end is used for being planted in an internal iliac artery vessel.

The iliac artery bifurcation stent provided by the embodiment of the application is provided with a main body stent 3 for being planted in the iliac artery blood vessel; an external iliac branch stent 1 which is connected with the distal end of the main body stent 3 and is used for being planted in an external iliac artery vessel, an internal iliac artery vessel stent 2 which is arranged in the main body stent 3 and an internal iliac artery vessel stent 4 which is matched and connected with the internal iliac artery vessel; a first opening is arranged on the side wall matched with the distal end of the main body bracket 3; the distal end of the ilium embedded bracket 2 is provided with a second opening, and the second opening is arranged corresponding to the first opening; the proximal end of the internal iliac artery stent 4 is arranged in the second opening, the distal end is used for being planted in an internal iliac artery, the internal iliac artery stent is designed to be a main body stent 3, the internal iliac artery stent 4 and the main body stent 3 can be fixedly arranged, and the internal iliac artery stent 4 can not be directly pressed by a vascular lumen, so that the internal iliac artery stent can be fully opened, and the risk of occlusion caused by pressing of the internal iliac artery stent 4 when the diameter of the common iliac artery is smaller due to common iliac artery stenosis, serious common iliac artery distortion and common iliac artery calcification is greatly reduced.

In some embodiments, the internal iliac artery stent 4, the external iliac branch stent 1, the internal iliac artery stent 2, and the internal iliac artery stent 4 each comprise a stent scaffold and a cover disposed on an outer surface of the stent scaffold. That is, the internal iliac artery stent 4, the external iliac branch stent 1, the internal iliac artery stent 2, and the internal iliac artery stent 4 are stent grafts. Thus, the whole iliac artery bifurcation stent can be a stent which is coated with special membranous materials on a metal stent and is used in the iliac artery bifurcation vessel of the human body. Not only maintains the function of the metal bracket, but also has the characteristic of membranous material.

In some embodiments, the metal bracket may be made of nickel-titanium alloy, stainless steel or cobalt-chromium alloy, and the coating may be made of polytetrafluoroethylene, polyester or polyurethane. For example, the material of the coating film may be PTED (polytetrafluoroethylene). The nickel-titanium alloy is a binary alloy composed of nickel and titanium, is a shape memory alloy, and can automatically restore plastic deformation of the nickel-titanium alloy to an original shape at a certain specific temperature, so that the iliac artery bifurcation stent has good plasticity. Polytetrafluoroethylene (Poly tDtra EluoroDthylDnD, abbreviated as PTED), commonly known as "plastic king", is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer. White wax, semitransparent, heat-resistant and cold-resistant, and can be used for a long time at-180-260 ℃. The coating film of the material can make the iliac artery bifurcation stent have the advantages of acid resistance, alkali resistance, various organic solvents resistance and the like, so that the iliac artery bifurcation stent has good stability in vivo. Meanwhile, because the polytetrafluoroethylene has the characteristic of high temperature resistance and extremely low friction coefficient, the iliac bifurcation stent has good lubricity, is convenient for placement of the iliac bifurcation stent and the like.

In some embodiments, part of the outer wall of the iliac embedded stent 2 along the axial direction is attached to and sewed with part of the inner wall of the main body stent 3. It is understood that the inner iliac stent 2 is disposed inside the main body stent 3, and one side outer wall of the inner iliac stent 2 is attached to one side inner wall of the main body stent 3.

In some embodiments, the extension direction of the partial outer wall is perpendicular to the radial direction of the body support 3. It is understood that the outer wall of one side of the ilium inner embedded stent 2 is attached to the inner wall of one side of the main body stent 3 and is sewn and fixed in a direction perpendicular to the cross section of the main body stent 3. Like this, can make the embedded support 2 of ilium fixed firm with main part support 3, have good stability, avoid the swing that blood washout arouses, and avoid appearing the dead angle in the contained angle between embedded support 2 of ilium and the main part support 3, and then avoid blood to gather and form the thrombus.

The proximal end of the internal iliac artery stent 4 is nested in the internal iliac artery stent 2, and the internal iliac artery stent 4 extends out of the second opening. It will be appreciated that the proximal end of the internal iliac artery stent 4 is disposed nested within the internal iliac artery stent 2 and extends from the second opening at the distal end of the internal iliac artery stent 2, and that the distal end of the internal iliac artery stent 4 is disposed nested within the internal iliac artery. That is, a first opening is opened in the middle region of the main body stent 3, and then an ilium-embedded stent 2 is sewn into the first opening. And the internal iliac artery stent 4 is connected with the internal iliac artery stent 2, one part (such as half, or nearly half, etc.) of the internal iliac artery stent 4 along the axial direction is nested and overlapped with the internal iliac artery stent 2, and the other part is partially exposed out of the second opening and nested in the internal iliac artery vessel. Thus, the sealing property of the internal iliac artery stent 4 can be improved, and blood leakage, ischemia and the like can be avoided. In some embodiments, as shown in fig. 5, the internal iliac artery stent 4 and the internal iliac stent 2 are interference fits, i.e., the diameter of the internal iliac artery stent 4 should be guaranteed to be greater than the diameter D of the internal iliac stent 2. Similarly, the diameter a of the main body stent 3 needs to match the diameter of the common iliac artery vessel, and the diameter B of the external iliac branch stent 1 needs to match the diameter of the external iliac artery vessel. That is, the main body stent 3 is interference fit with the common iliac artery blood vessel, the external iliac branch stent 1 is interference fit with the external iliac artery blood vessel, and the internal iliac artery blood vessel stent 4 is interference fit with the internal iliac artery blood vessel, so that the bifurcated stent of the iliac artery can be interference fit with the human blood vessel, and the stent displacement problem caused by blood flow scouring and the like can be prevented.

In some of these embodiments, the diameter of the internal iliac artery stent 4 can be greater than the diameter D of the internal iliac stent 2. In this way, the internal iliac artery stent 4 and the internal iliac artery stent 2 can be in interference fit, and the expansion force of the internal iliac artery stent 4 is utilized to resist the blood flow impact force at the bifurcation of the iliac artery, so that the internal iliac artery stent 4 is prevented from being flushed and shifted by blood flow.

In some of these embodiments, the internal iliac artery stent 4 can have a diameter that is greater than the diameter of an internal iliac artery vessel. Thus, the diameter of the internal iliac artery stent 4 can be matched with the diameter of the internal iliac artery, the internal iliac artery stent 4 is tightly attached to the internal iliac artery, the stability of the internal iliac artery stent 4 in the internal iliac artery is improved, and the displacement of the internal iliac artery stent 4 caused by blood flow scouring and the like are prevented.

In some of these embodiments, the ratio of the diameter of the internal iliac artery stent 4 to the diameter of the internal iliac artery vessel is (1.1-1.3): 1. thus, the internal iliac artery stent 4 can be better matched with the diameter of the internal iliac artery, the internal iliac artery stent 4 is more closely attached to the internal iliac artery, and the shrinkage of the internal iliac artery stent 4 in the internal iliac artery due to the overlarge diameter of the internal iliac artery stent 4 can be avoided, so that the formation of thrombus and the like can be avoided.

In some of these embodiments, the ratio of the diameter a of the main body stent 3 to the diameter of the common iliac vessel is 1: (1.1-1.3). Thus, the main body stent 3 can be better matched with the diameter of the common iliac artery, the main body stent 3 is more closely attached to the common iliac artery, and the main body stent 3 is prevented from shrinking in the common iliac artery due to the overlarge diameter A of the main body stent 3, so that thrombus and the like are prevented from being formed.

In some of these embodiments, the ratio of the diameter B of the external iliac branch stent 1 to the diameter of the external iliac artery vessel is 1: (1.1-1.3). In this way, the external iliac branch stent 1 can be better matched with the diameter of the external iliac artery, the external iliac branch stent 1 is more closely attached to the external iliac artery, and the shrinkage of the external iliac branch stent 1 in the external iliac artery caused by the overlarge diameter B of the external iliac branch stent 1 can be avoided, so that the formation of thrombus and the like can be avoided.

In some embodiments, as shown in fig. 2 and 5, the main body stent 3 has a connection region 11, the proximal end of the connection region 11 is fixedly connected with the main body stent 3, and the distal end of the connection region 11 is fixedly connected with the external iliac branch stent 1; the main body bracket 3, the connecting region 11 and the external iliac branch bracket 1 are integrally formed and are arranged in a diameter-changing way in the axial direction. Wherein the diameter of the main body stent 3 is larger than the diameter of the external iliac branch stent 1, and the proximal diameter of the connecting region 11 is larger than the distal diameter. It will be appreciated that the main body stent 3, the junction zone 11 and the external iliac branch stent 1 are funnel-shaped in the axial direction. Thus, through the integrated into one piece design, can make the bifurcated stent of iliac artery have good stability, can avoid taking place hourglass blood etc. at the junction of main part support 3 and the outer branch support of iliac 1, and can simplify the manufacturing flow etc. of bifurcated stent of iliac artery.

In some embodiments, the difference in diameter of the body scaffold and the outer iliac branch scaffold may be 2-10 mm. That is, the difference in diameter of the connection region 11 may be 2 to 10mm.

In some embodiments, the connecting region 11 is arranged in a reducing manner in the axial direction, that is, the connecting region 11 is arranged obliquely in the axial direction, the diameter of the proximal end of the connecting region 11 is the same as the diameter a of the main body stent 3, and the diameter of the distal end of the connecting region 11 is the same as the diameter B of the external iliac branch stent 1. That is, the junction of the main body stent 3 and the external iliac branch stent 1 is provided as a transitional inclined section having an inclination angle. The inclination angle may be set to 90 to 180 °. In this way, the main body stent 3 and the external iliac branch stent 1 can be made to better fit the common iliac artery blood vessel and the external iliac artery blood vessel. The main body bracket 3, the connecting area 11 and the external iliac branch bracket 1 which are integrally formed in the iliac artery bifurcation bracket are integrally arranged in a variable diameter mode and are funnel-shaped. Thus, the connection stability of the internal iliac artery blood vessel and the internal iliac stent 2 can be improved, and the blood flow impact resistance of the external iliac branch stent 1 can be improved. In some embodiments, the first opening is provided in the connection region 11; the second opening is arranged in the connecting area 11, and the arrangement position of the second opening in the connecting area 11 corresponds to the arrangement position of the internal iliac artery blood vessel in the common iliac artery blood vessel. That is, the opening portion of the transiliac in-line stent 2 far from the heart end (distal end) is designed at the transition inclined section of the main body stent 3 and the transiliac out-branch stent 1, and the opening portion of the distal end of the main body stent 3 is designed at the transition inclined section of the main body stent 3 and the transiliac out-branch stent 1. Like this, can make the opening position (i.e. the second opening) of the distal end of embedded support 2 of ilium combine with the wall of main part support 3, the cooperation transition section is inclination, can make when embedded support 2 of ilium dock the distal end opening part of main part support 3, the embedded support 2 of ilium more straight, the angle of connection of ilium internal artery vascular support 4 and main part support 3 can not appear 90 buckling, but presents the obtuse angle, is between 90-180, and the blood flow impact that ilium internal artery vessel received is slowed down like this.

In some embodiments, as shown in fig. 3, the cross-section of the ilium inner stent 2 is circular in shape. In particular, a small portion of the wall of the proximal end of the ilium in-line stent 2 (i.e., proximal end, within the body stent 3) that resembles a dot may be sewn to the membrane of the body stent 3 such that the ilium in-line stent 2 is nested within the body stent 3 and has the same common tangent as the body stent 3. The cross-sectional shape of the ilium stent graft 2 is thus almost circular, and is almost unchanged from the shape before suturing.

In some embodiments, as shown in fig. 4, the cross-section of the ilium inner stent 2 is elliptical-like in shape. In particular, a portion of the wall of the proximal end of the ilium stent graft 2 (i.e., proximal end, within the body stent 3) that resembles a wire may be sutured to the membrane of the body stent 3. The cross-section of the ilium stent graft 2 is thus almost elliptical (i.e., elliptical-like), and is changed to a certain extent from the shape before suturing, which is more closely fitted to the main body stent 3.

In some embodiments, the length C of the main body stent 3 is 30mm-120mm, so as to adapt to arterial lesions of different sites. In some of these embodiments, the length C of the body support 3 may be around 30-60 mm. The main body bracket 3 with the length can be matched with the length of common iliac artery blood vessels with equal length, and can be independently placed in a human body for treating the iliac artery lesions. In other embodiments, the length C of the body support 3 may be around 70-120mm. The main body stent 3 with the length can penetrate into the abdominal aorta vessel and be matched with the bifurcation legs of the abdominal aortic bifurcation stent to form a whole body for treating the lesions of the abdominal aortic aneurysm involving the iliac aneurysm.

The iliac bifurcation stent of the embodiments of the present application can be implanted at an iliac artery at a designated location in a human body by a delivery system. As shown in fig. 6, the delivery system may include a delivery sheath 5, a handle 6, a hub 7, a pre-guidewire 8, a pre-catheter 9, and a mandrel tube 10. The preset guide wire can be called as an embedded guide wire, and can be understood as the guide wire which is placed in advance in the conveying system before the iliac artery bifurcation stent leaves the factory, so that the guide wire does not need to be replaced after the stent is released, and the method has the advantages of reducing operation time and the like. Wherein, through the guidance of this preset guide wire and through pathological changes, can carry out interventional operation, carry out radiography, catheter pass-through and other therapeutic operations. Wherein the iliac bifurcation stent may be preloaded within delivery sheath 5 and adjacent to E, a pre-guidewire 8 is fed into the delivery system from hub 7, through handle 6 and delivery sheath 5, and through the iliac embedded stent 2 (as shown in fig. 7), and out the tip of delivery sheath 5 (as shown in fig. 8). The preset guide wire 8 is sleeved with the preset guide tube 9, the preset guide tube 9 can ensure smooth pushing of the preset guide wire 8, and meanwhile, when the preset guide wire is replaced, the preset guide wire is more convenient.

The iliac bifurcation stent of the embodiment of the application is used for being implanted at the iliac arteries of a human body to solve vascular diseases such as iliac aneurysms or iliac artery dilation, iliac artery stenosis and the like. According to the iliac artery bifurcation stent, the iliac artery vessel stent 4 is designed to be an independent stent, and is connected with the main body stent 3 through the iliac artery endo stent 2 with the main body stent 3, so that the risk that the iliac artery vessel is pressed and blocked due to the fact that the iliac artery endo stent 2 of the iliac artery bifurcation stent is externally arranged when the diameter of the vessel is smaller due to the stricture, serious distortion and calcification of the iliac artery can be avoided.

The principle of the iliac bifurcation stent in the embodiment of the application is that the stent is a covered stent as a whole and is placed at an iliac artery, wherein the main stent 3 is placed at the iliac artery, the external iliac branch 1 is placed at the external iliac artery, and after the internal iliac artery vascular stent 4 is placed towards the internal iliac artery through the internal iliac stent 2, the flow direction of blood is limited by the film which is covered on the stent, so that the blood can only flow towards a pipeline set by the stent, and for patients with iliac aneurysms, the implantation of the stent can prevent the blood from continuously flowing into the iliac aneurysms and inhibit the iliac aneurysms from continuously increasing; the metal brackets are all arranged in the whole course of the bracket to be used as the framework, so that the metal brackets used as the framework can provide necessary supporting force for patients with the iliac artery stenosis, prevent the arterial stenosis, reconstruct the iliac artery blood vessel and ensure the patency of the arterial blood flow at the position. Because the structure of the human body at the iliac arteries is common iliac artery blood vessels, external iliac artery blood vessels and internal iliac artery blood vessels are separated. In order to ensure that two bifurcated vessels can both have blood flow supply and treat aneurysms or arterial stenosis, an internal iliac stent 2 is designed on the stent, so that blood flow can be ensured to flow to external iliac arteries through external iliac branches on one hand and flow to internal iliac arteries through a designed internal iliac stent 2 passage on the other hand, and the treatment purpose is achieved.

Compared with the prior art, the iliac artery bifurcation stent provided by the embodiment of the application does not need to dilate a narrow blood vessel in advance, and can save the step of pre-dilating a balloon dilation catheter and save the operation time. First, for the patient whose vessel diameter is below 18mm at common iliac artery, the stent of the utility model can be implanted normally without the limitation of vessel diameter because the internal iliac stent 2 is embedded in the main stent 3; secondly, for patients with severe tortuosity of common iliac arteries, the contact part of the stent and the blood vessel is the main body stent 3, and the internal iliac stent 2 is not limited by tortuosity and can still be normally used; third, in the release process, because the iliac embedded stent 2 is embedded in the main body stent 3, dragging the delivery sheath will not affect the iliac embedded stent 2, and will not affect the subsequent selection of the iliac artery.

When the iliac artery bifurcation stent provided by the embodiment of the application is used, CT or magnetic resonance images are measured before an operation is performed, and the diameters of the common iliac artery blood vessel, the external iliac artery blood vessel, the internal iliac artery blood vessel and other blood vessels are determined, so that the proper model of the iliac artery bifurcation stent can be selected according to the measurement result. Before the ilium artery bifurcation stent is implanted, femoral artery puncture operation is performed. After the successful puncture procedure, a stiffening guidewire is inserted from within the sheath of delivery sheath 5 and delivered to the targeted iliac artery segment. The iliac bifurcation stent is compressed in a sheath tube of a special delivery system, a guide wire (i.e., a preset guide wire 8) is preset in the iliac endo-stent 2 of the iliac bifurcation stent, the guide wire head of the preset guide wire 8 is tied in a pre-designed groove on the conical head of the delivery system, and then the preset guide wire 8 passes through the iliac endo-stent 2 from the main body stent 3 to the outside of the external iliac bifurcation, is retracted into the sheath tube of the delivery sheath 5, and is connected with the distal end (handle end) of the delivery system.

Wherein, during delivery, the delivery system delivers the iliac bifurcation stent to the target iliac artery segment along a stiffening guidewire advanced therein, positions the iliac bifurcation stent via a marker, withdraws the sheath to expose the pre-guidewire, accesses the snare from the contralateral femoral artery, captures the pre-guidewire, and withdraws the pre-guidewire from the contralateral femoral artery. Continuing to withdraw the sheath tube, gradually releasing the main body stent 3, after the main body stent 3 is completely released, introducing a guide tube and a guide wire from the contralateral guide wire, selecting the target internal iliac artery, releasing the internal iliac artery vascular stent 4, and then continuing to completely release the iliac artery bifurcation stent. The distal end (distal to the heart end) of the internal iliac artery stent 4 is placed within an internal iliac artery vessel. Since the internal iliac artery stent 4 is the only passage between the common iliac artery and the internal iliac artery, the gap between the vessel wall and the main stent 3 can be ensured not to be exposed to blood flow, and the blood flow can not flow backward to the external iliac artery or the common iliac artery and smoothly enter the internal iliac artery. Then, the tracer marker at the front end of the guide wire is used for radiography to confirm whether the stent is safely released or not, and all guide wires, catheters and conveying systems are withdrawn to complete the stent implantation operation.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.

Claims (10)

1. An iliac bifurcation stent comprising a main body stent for implantation in a common iliac artery vessel; an external iliac branch stent which is connected with the distal end of the main body stent and is used for being planted in an external iliac artery vessel, an internal iliac artery vessel stent which is arranged in the main body stent and is matched and connected with the internal iliac artery stent and is used for being planted in the internal iliac artery vessel;

wherein, at least part of the outer wall of the inner ilium embedded bracket along the axial direction is fixedly connected with the main body bracket; a first opening is formed in the side wall of the distal end of the main body support; the distal end of the ilium embedded bracket is provided with a second opening, and the second opening is arranged corresponding to the first opening; the proximal end of the internal iliac artery stent is arranged in the second opening, and the distal end is used for being implanted in an internal iliac artery vessel.

2. The iliac artery bifurcation stent of claim 1, wherein a portion of an outer wall of said iliac embedded stent in an axial direction is in apposition and suture connection with a portion of an inner wall of said main body stent; the proximal end of the internal iliac artery stent is nested in the internal iliac artery stent, and the internal iliac artery stent extends out of the second opening.

3. The iliac bifurcation stent of claim 2, further comprising a junction zone, a proximal end of the junction zone being fixedly connected to the main body stent, a distal end of the junction zone being fixedly connected to the external iliac branch stent; the main body bracket, the connecting area and the external iliac branch bracket are integrally formed and are arranged in a diameter-changing way in the axial direction;

the diameter of the proximal end of the connecting area is the same as that of the main body support, and the diameter of the distal end of the connecting area is the same as that of the external iliac branch support.

4. The iliac artery bifurcation stent of claim 3, wherein said portion of outer wall extends in a direction perpendicular to a radial direction of said main body stent; the first opening is arranged in the connecting area; the second opening is arranged in the connecting area, and the arrangement position of the second opening in the connecting area corresponds to the arrangement position of the internal iliac artery blood vessel in the common iliac artery blood vessel.

5. The iliac bifurcation stent of claim 3, wherein the diameter of the internal iliac artery stent is greater than the diameter of the internal iliac stent; and/or

The diameter of the main body support is larger than that of the external iliac branch support, and the diameter of the proximal end of the connecting zone is larger than that of the distal end.

6. The iliac artery bifurcation stent of claim 5, wherein the ratio of the diameter of said internal iliac artery stent to the diameter of an internal iliac artery vessel is (1.1-1.3): 1, a step of; and/or

The ratio of the diameter of the main body stent to the diameter of the common iliac artery blood vessel is 1: (1.1-1.3); and/or

The ratio of the diameter of the external iliac branch stent to the diameter of the external iliac artery blood vessel is 1: (1.1-1.3); and/or

The difference between the diameter of the main body bracket and the diameter of the external iliac branch bracket is 2-10 mm.

7. The iliac artery bifurcation stent of claim 1, wherein said internal iliac artery stent, said external iliac branch stent, said internal iliac artery stent, and said internal iliac artery stent each comprise a stent scaffold and a coating disposed on an outer surface of said stent scaffold.

8. The iliac bifurcation stent of claim 1, wherein the cross-section of the iliac embedded stent is circular or elliptical in shape; and/or

The ilium embedded bracket is sewed at the distal end of the main body bracket.

9. The iliac artery bifurcation stent of claim 1, wherein the length of said main body stent is 30mm-120mm.

10. The iliac artery bifurcation stent of claim 9, wherein the length of said main body stent is 30mm-60mm or 70-120mm.

Images