CN210144804U

CN210144804U - Covered stent

Info

Publication number: CN210144804U
Application number: CN201920414915.5U
Authority: CN
Inventors: 陈白浪; 陈平浪
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-03-17
Anticipated expiration: 2029-03-28

Abstract

The utility model discloses a covered stent relates to and intervenes medical instrument technical field, including support main part and the three collateral branch of all being connected with the support main part, each collateral branch all communicates with the support main part mutually, and support main part and collateral branch are constituteed by metal support and tectorial membrane pipe, and metal support fixes on the inner wall or the outer wall of tectorial membrane pipe, and a body structure is constituteed with the support main part to each collateral branch. So set up, collateral branch and support main part structure as an organic whole, there is not the gap collateral branch and support main part's junction, the problem that blood spills from the junction of collateral branch and support main part can not appear to, need not be connected collateral branch and support main part in the art, the operation in the art of more being convenient for has shortened operation time, has reduced the operation risk. In the preferred scheme of this scheme, the corrugated membrane pipe section of collateral branch makes the collateral branch can extend to arbitrary direction to make the covered stent be applicable to different people's thoracic aorta, the elastic construction can also reduce the depressed part on the support main part and produce deformation.

Description

Covered stent

Technical Field

The utility model relates to an intervene medical instrument technical field, more specifically say, relate to a tectorial membrane support.

Background

The thoracic aorta includes an ascending aorta and a descending aorta connected to the heart with an aortic arch therebetween. The aortic arch has three branch vessels, which are respectively: brachiocephalic trunk, left common carotid artery and left subclavian artery. When high-pressure blood flows through a laceration on the ascending aorta or the descending aorta and is flushed into the vessel wall, the tunica media can be torn, and an aortic dissection is formed.

Currently, a stent graft can be placed at the aortic arch via an interventional procedure, with the blood flow isolated from the aortic dissection by the stent graft. For interlayer lesions with three branches, the measurement before operation is needed due to the uncertainty of the opening positions of the three branches of the aortic arch part, three through holes corresponding to the branch vessels are formed in the stent main body of the covered stent according to the measurement data, the stent main body is conveyed to the position of the aortic arch, the three branches are connected to the corresponding through hole positions respectively, finally, the stent main body and the branches are assembled together, the joint of the stent main body and the branches is difficult to avoid, gaps and risks of internal leakage exist, the installation process is inconvenient for operation in the operation, the operation time is prolonged, and the operation risk is correspondingly increased.

Therefore, how to solve the problems that the stent graft in the prior art has the risk of internal leakage, is inconvenient to operate in the operation, has long operation time and has high operation risk becomes a technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a covered stent, the risk of leaking in solving among the prior art covered stent exists, and the operation of being not convenient for in the art, the problem that operating time is longer, the operation risk is big. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.

The utility model provides a covered stent, including support main part and three all with the collateral branch that the support main part is connected, each the collateral branch all with the support main part is linked together, the support main part with the collateral branch comprises metal support and tectorial membrane pipe, metal support fixes on the inner wall or the outer wall of tectorial membrane pipe, each the collateral branch with a body structure is constituteed to the support main part.

Preferably, at least one of the side branches comprises a corrugated membrane tube section connected with the stent body and an expansion section connected with the corrugated membrane tube section.

Preferably, the number of said side branches comprising said bellows section and said expansion section is two, and respectively two said side branches for extending into the left common carotid artery and the left subclavian artery.

Preferably, the bracket main body is provided with a recess, the recess is recessed in the axial direction of the bracket main body, and at least one side branch is connected to the recess.

Preferably, the number of the side branches connected to the recess is two, and two side branches for extending into the left common carotid artery and the left subclavian artery, respectively.

Preferably, the wall of the bracket main body is provided with an elastic structure, the elastic structure is arranged outside the depressed part, the stretching direction of the elastic structure is consistent with the extending direction of the bracket main body, and the connecting point of the side branch and the bracket main body is positioned on the extension line of the elastic structure.

Preferably, the elastic structure is a spring, and an end of the spring is connected with the metal bracket.

Preferably, the elastic structures are arranged in a plurality and uniformly distributed on the bracket main body.

Preferably, the metal supports are arranged in a plurality and are arranged along the axial direction of the support main body, and each metal support is in a wave-shaped annular structure.

Preferably, the edge of the recess is provided with a metal frame.

The utility model provides an among the technical scheme, the tectorial membrane support includes support subject and three collateral branch, and each collateral branch all is connected with the periphery wall of support subject, and each collateral branch all is linked together with the support subject. When three-branch interlayer lesions are treated by operation, the covered stent is implanted into thoracic aorta, wherein the stent main body is arranged at the position of an aortic arch, three side branches respectively extend into a brachiocephalic trunk, a left common carotid artery and a left subclavian artery, and blood flow is isolated from an aortic interlayer through the covered stent. The stent main body and the side branches are both composed of metal stents and coated tubes, the metal stents are fixed on the inner wall or the outer wall of the coated tubes, and an integrated structure is formed between each side branch and the stent main body. So set up, collateral branch and support main part structure as an organic whole, with the tectorial membrane support implant thoracic aorta in, there is not the gap in the junction of collateral branch and support main part, the problem that blood spills from the junction of collateral branch and support main part can not appear to, need not be connected collateral branch and support main part in the art, the operation in the art of more being convenient for has shortened operation time, has reduced the operation risk.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a front view of a stent graft according to an embodiment of the present invention;

FIG. 2 is a top view of a stent graft according to an embodiment of the present invention;

FIG. 3 is a schematic illustration of a side branch including a corrugated membrane pipe section and an expansion section in an embodiment of the invention;

FIG. 4 is a schematic structural view of the stent graft according to the embodiment of the present invention after being implanted into the thoracic aorta.

In fig. 1-4:

1-stent main body, 2-side branch, 3-metal stent, 4-film-coated tube, 5-concave part, 6-elastic structure, 7-metal frame, 8-corrugated film tube section and 9-expansion section.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The purpose of this embodiment is to provide a covered stent, solve among the prior art covered stent and have the risk of interior hourglass, and the operation of being not convenient for in the art, the operation time is longer, the problem that the operation risk is big.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1-2, in the present embodiment, the stent graft includes a stent main body 1 and three side branches 2, wherein the three side branches 2 are connected to the outer peripheral wall of the stent main body 1, and the three side branches 2 are communicated with the stent main body 1. After the covered stent is implanted into thoracic aorta through an operation, the stent main body 1 is arranged at the position of an aortic arch, the three side branches 2 respectively extend into the brachiocephalic trunk, the left common carotid artery and the left subclavian artery, and blood flow and an aortic interlayer are isolated through the covered stent. The stent main body 1 and the side branch 2 are composed of a metal stent 3 and a coated tube 4, the metal stent 3 is fixed on the inner wall or the outer wall of the coated tube 4, each side branch 2 and the stent main body 1 form an integrated structure, and the coated tube 4 of the side branch 2 and the coated tube 4 of the stent main body 1 are integrated.

So set up, because support main part 1 and collateral branch 2 structure as an organic whole, after implanting the tectorial membrane support in the thoracic aorta, blood can not leak the position between tectorial membrane support and the vascular wall, moreover, at the operation in-process, need not assemble collateral branch 2 and support main part 1, the operation process is comparatively simple, has saved the time of operation in-process, and the risk of operation reduces.

However, the stent main body and the side branch in the prior art are of a split structure, and after the stent main body is implanted into the aortic arch, the side branch is required to be connected to a corresponding position on the stent main body, so that the complexity of the operation process is increased, the operation time is long, the risk is high, the stent main body and the side branch are assembled together, a gap exists at the connecting position of the side branch and the stent main body, blood leaks from the gap, the operation is failed, and even danger occurs.

In a preferred embodiment of the present invention, referring to fig. 1-3, at least one side branch 2 of the three side branches 2 is composed of a corrugated membrane pipe section 8 and an expansion section 9, the corrugated membrane pipe section 8 is connected with the expansion section 9, and the corrugated membrane pipe section 8 is connected with the stent body 1. That is, one or two or all of the three side branches 2 may be composed of the bellows membrane tube section 8 and the expansion section 9. The corrugated membrane pipe section 8 can be extended and shortened, can be bent towards all directions, and has flexible and variable shape. Because individual difference, distance and extending direction between the three branch blood vessels on the thoracic aorta all have certain difference to the individual of difference, in order to make the crowd that the covered stent is suitable for wider, set up the part that collateral branch 2 is connected with support main part 1 into corrugated membrane pipeline section 8, through crooked corrugated membrane pipeline section 8, make each collateral branch 2 homoenergetic stretch into corresponding branch blood vessel in, and reach better cooperation effect.

So set up, through the ripple membrane pipeline section 8 of crooked collateral branch 2 for the covered stent can be applicable to different people's thoracic aorta, however, covered stent among the prior art need carry out the three-way window operation in vitro, confirm the position of windowing according to the distance between the branch blood vessel that surveys in advance, with the collateral branch of guaranteeing on the covered stent can be better with a blood vessel cooperation, covered stent among the prior art needs the customization, and the process is complicated, can not be applicable to different people.

Specifically, in this embodiment, the three side branches 2 are a first side branch extending into the brachiocephalic trunk, a second side branch extending into the left common carotid artery, and a third side branch extending into the left subclavian artery, respectively, and the number of the side branches 2 including the bellows tube section 8 and the expansion section 9 is two, and the side branches are a second side branch extending into the left common carotid artery and a third side branch extending into the left subclavian artery, respectively. Preferably, the first lateral branch only comprises the expansion section 9, and the expansion section 9 is directly connected with the stent main body 1.

The thicker branch blood vessel in the three side branches 2 is the head-arm trunk, and the head-arm trunk can provide enough blood and oxygen for the patient during the operation, thereby reducing the complication caused by oxygen deficiency during the operation and reducing the operation risk. The support of the expansion section 9 is strong and the first limb is therefore arranged to comprise only the expansion section 9. Since the supporting effect of the bellows tube section 8 is relatively weak and a certain deformation is required according to the position and the extending direction of the branch vessel during the operation, the second side branch and the third side branch are arranged to include the bellows tube section 8 and the expansion section 9.

So set up, ensure that the covered stent is applicable to different individuals through the ripple membrane tube section 8 of crooked second collateral branch and third collateral branch, simultaneously, first collateral branch only includes inflation section 9, can guarantee the blood supply in the brachiocephalic trunk, reduces the complication and the operation risk of operation.

It should be noted that the diameter of the expanded section 9 may be larger than the diameter of the corrugated membrane tube section 8, so that the corrugated membrane tube section 8 can extend in any direction. The supporting effect of the expansion section 9 is better, and the outer wall surface of the corrugated membrane pipe section 8 is wavy, so that the corrugated membrane pipe section is not convenient to completely fit with the inner wall of the branch vessel. In order to prevent blood from flowing back between the second side branch and the branch vessel and between the third side branch and the branch vessel, a section of the side branch 2 away from the stent main body 1 is provided as an expanded section 9, and the diameter of the expanded section 9 is set larger than that of the corrugated membrane tube section 8. Of course, the diameter of the bellows tube segment 8 should not be too small, otherwise it would cause a large resistance to the flow of blood and affect the blood supply to the patient. In some embodiments, the diameter of the corrugated membrane tube section 8 may also be equal to the diameter of the expanded section 9.

In the present embodiment, the stent body 1 is provided with a recess 5, the recess 5 is recessed in the axial direction of the stent body 1, and at least one side branch 2 is connected to the recess 5. That is, the number of side branches 2 connected to the concavity 5 may be one, two or three.

With the arrangement, when the side branch 2 extends into the branch vessel in the operation process, the concave part 5 provides a certain operation space for the operation, so that the corrugated membrane tube section 8 can be bent and stretched conveniently; moreover, the blood in the concave part 5 can flow into the branch blood vessel, so that serious complications of ischemia and hypoxia of a patient are avoided.

In a preferred embodiment of the present invention, referring to fig. 1 and 4, the number of the side branches 2 connected to the concave portion 5 is two, and the side branches 2 connected to the concave portion 5 are the second side branch and the third side branch. After the stent graft is implanted into an aortic arch, the stent main body 1 needs to be of a bending structure, both the side branch 2 and the concave part 5 are located on a large bending side of the bending structure, the groove can deform to a certain extent when the stent main body 1 is bent, and the concave depth of the concave part 5 becomes shallow. In order to minimize the deformation of the recess 5, the groove should not be too large, so that only the second and third side branches are connected inside the recess 5 and the first side branch is connected outside the recess 5.

In this embodiment, referring to fig. 1 and fig. 2, the wall of the stent main body 1 is provided with an elastic structure 6, and the elastic structure 6 is disposed at a portion outside the concave portion 5, the stretching direction of the elastic structure 6 is the same as the extending direction of the stent main body 1, and the connection point of the side branch 2 and the stent main body 1 is located on the extension line of the elastic structure 6. After the tectorial membrane support is implanted into the aortic arch, support main part 1 need be the bending structure, and collateral branch 2 and elastic structure 6 all set up at the big curved side of bending structure, and elastic deformation takes place for elastic structure 6 after the bending for the part that is equipped with elastic structure 6 on the big curved side of support main part 1 is stretched at crooked in-process, thereby reduces the deflection of depressed part 5. Ensuring that the depression 5 provides an operating space for the operation and a small amount of blood for the left common carotid artery and the left subclavian artery.

Specifically, the elastic structure 6 is a spring, and the end of the spring is connected to the metal bracket 3. The connecting point of the spring and the metal bracket 3 is fixedly connected with the film coating pipe 4, and the positions of the spring except the two ends are in contact connection with the film coating pipe 4. So set up, at the crooked in-process of support main part 1, the great side of bending of tectorial membrane pipe 4 takes place tensile deformation when the spring takes place elastic deformation, and the spring is more nimble with the deformation process of tectorial membrane pipe 4, and the power of holding down each other is less. Preferably, the spring is provided in plurality and evenly distributed on the stand body 1. When the stent main body 1 is bent, the stress of the stent main body 1 is more uniform, and the service life of the covered stent is prolonged.

In a preferred embodiment of the present invention, the metal stent 3 has a wavy annular structure, and the number of the metal stents 3 is plural and is uniformly distributed along the axial direction of the stent body 1. The waveform presented by the metal stent 3 may be a Z-type wave, a sine wave, a V-type wave, or the like. The metal stents 3 and the coated tube 4 are fixed together by suture.

In this embodiment, the edge of the recess 5 is provided with a metal rim 7. So set up, metal frame 7 has certain supporting role, plays the effect of strengthening the intensity of depressed part 5, can prevent that depressed part 5 from taking place deformation. The metal frame 7 and the elastic structure 6 are combined with each other to play a role in double protection and prevent the deformation of the concave part 5 to the maximum extent. The bottom of the concave part 5 is also provided with a metal bracket 3 which plays a certain supporting role.

It should be noted that the material of the metal stent 3 may be, but is not limited to, a memory alloy, and the memory alloy is a nitinol wire, etc.; the material of the coated tube 4 is polymer material, terylene material or heat sensitive material, such as polytetrafluoroethylene material. The diameter of the first side branch ranges from 15 to 20mm, the diameter of the expansion section 9 ranges from 10 to 15mm, the length of the recess 5 ranges from 30 to 35mm, the depth of the recess 5 ranges from 9 to 11mm, and preferably, the depth of the recess 5 ranges from 10 mm.

The following description specifically describes the stent graft in conjunction with the above embodiments, in this embodiment, the stent graft includes a stent main body 1 and three side branches 2 connected to the stent main body 1, each side branch 2 is connected to the stent main body 1, after the stent graft is implanted into the thoracic aorta, the stent main body 1 is placed at the position of the aortic arch, and the three side branches 2 respectively extend into the brachiocephalic trunk, the left common carotid artery and the left subclavian artery, wherein the first side branch extends into the brachiocephalic trunk, the second side branch extends into the left common carotid artery, and the third side branch extends into the left subclavian artery. Each side branch 2 and the support main body 1 form an integral structure, each side branch 2 and the support main body 1 are respectively composed of a metal support 3 and a film-coated pipe 4, the metal support 3 is connected on the inner wall or the outer wall of the film-coated pipe 4, the second side branch and the third side branch respectively comprise a corrugated film pipe section 8 and an expansion section 9 connected with the corrugated film pipe section 8, the corrugated film pipe section 8 is connected with the support main body 1, the support main body 1 is provided with a concave part 5, the concave part 5 is concave towards the axial direction of the support main body 1, the second side branch and the third side branch are connected on the concave part 5, the support main body 1 is also provided with a spring, the end part of the spring is connected with the metal support 3, the spring, and the stretching direction is the extending direction of the bracket main body 1, and the connection point of the side branch 2 and the bracket main body 1 is on the extension line of the spring, that is, after the bracket main body 1 is bent, the side branch 2, the concave part 5 and the spring are all positioned at the large bending side of the bracket main body 1. The covered stent is compressed in the sheath, the covered stent is transported to the position of the aortic arch through the sheath, then the covered stent is released, the metal stent 3 is unfolded, and each side branch 2 is extended into the corresponding branch vessel.

So set up, collateral branch 2 and support main part 1 structure as an organic whole, do not have the problem of seepage blood between collateral branch 2 and the support main part 1, need not connect collateral branch 2 and support main part 1 at the operation in-process, saved operation time, reduced the operation risk, ripple membrane pipeline section 8 can be crooked towards all directions moreover for this tectorial membrane support is applicable to different people's aortic arch intermediate layer pathological change.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The utility model provides a plurality of schemes contain the basic scheme of itself, mutual independence to restrict each other, but it also can combine each other under the condition of not conflicting, reaches a plurality of effects and realizes jointly.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A covered stent is characterized by comprising a stent main body (1) and three side branches (2) which are connected with the stent main body (1), wherein each side branch (2) is communicated with the stent main body (1), the stent main body (1) and the side branches (2) are both composed of a metal stent (3) and a covered tube (4), the metal stent (3) is fixed on the inner wall or the outer wall of the covered tube (4), each side branch (2) and the stent main body (1) form an integrated structure, a concave part (5) is arranged on the stent main body (1), the concave part (5) is concave towards the axial direction of the stent main body (1), and at least one side branch (2) is connected on the concave part (5); be equipped with elastic construction (6) on the wall of support main part (1), elastic construction (6) set up outside depressed part (5), the flexible direction of elastic construction (6) with the extending direction of support main part (1) is unanimous, just collateral branch (2) with the tie point of support main part (1) is located on the extension line of elastic construction (6).

2. A stent graft according to claim 1, characterised in that at least one of the side branches (2) comprises a corrugated membrane tube section (8) and an expansion section (9) connected to the corrugated membrane tube section (8), the corrugated membrane tube section (8) being connected to the stent body (1).

3. A stent graft according to claim 2, characterised in that the number of side branches (2) comprising the bellows segment (8) and the expansion segment (9) is two, and respectively two side branches (2) for reaching into the left common carotid and left subclavian arteries.

4. The stent graft according to claim 1, wherein the number of the side branches (2) connected to the recess (5) is two, and there are two side branches (2) for extending into the left common carotid artery and the left subclavian artery, respectively.

5. A stent according to claim 1, wherein the resilient structure (6) is a spring, the ends of which are connected to the metal stent (3).

6. The stent graft according to claim 1, characterised in that the elastic structure (6) is provided in plurality and evenly distributed on the stent body (1).

7. The stent-graft according to claim 1, wherein the metal stent (3) is provided in plurality and arranged along the axial direction of the stent main body (1), and each metal stent (3) has a wavy annular structure.

8. The stent graft as claimed in claim 1, characterised in that the edge of the recess (5) is provided with a metal rim (7).