CN104287878B - Blood intra-cavity support - Google Patents

Abstract

The invention discloses a stent in a blood vessel cavity, which includes a tubular stent body, the side wall of the stent body is provided with a through hole communicating with the inside and outside; the center line of the through hole is inclined to one axial end of the stent body. The side wall of the stent body is provided with a through hole communicating with the inside and outside, which can maintain the circulation of blood inside and outside the stent at the branch blood vessel. The inner stent is placed in a way that the inner end of the through hole is inclined towards the blood flow direction, which avoids the direct impact of the blood flow on the intima of the blood vessel, and promotes the blood to flow in the form of laminar flow in the stent without generating eddy currents at the through hole, greatly reducing the impact of blood flow on the blood vessel. The damage caused by the vascular intima improves the protection of the vascular intima; at the same time, because most of the vascular intima is not covered in the place where the stent is implanted in the vascular cavity, the local vascular endothelium still maintains its own function, which reduces the impact of the stent on the endothelial function. Interference, so as to achieve a better therapeutic effect.

Description

Intravascular stent

technical field

The invention relates to a medical device, in particular to a stent in a blood vessel cavity.

Background technique

Vascular stents are placed in diseased blood vessels to achieve the purpose of supporting stenotic and occluded blood vessels, expanding the true lumen of blood vessels, isolating lesions, reducing elastic retraction and reshaping of blood vessels, and maintaining smooth blood flow in the lumen. The minimally invasive interventional therapy technology using the principle of intracavitary isolation uses a delivery system with a small diameter to deliver the compressed stent with support to the position of the vascular lesion. After accurate positioning, it is released and braced. When opening diseased blood vessels, stents generally include covered stents and bare stents. Most of the bare stents in the prior art are wire mesh structures, and the blood flow at the mesh still has a large impact on the intima of the vessel. The stent-graft is more reliable in isolating lesions, but there are difficult problems such as blocking branch vessels, endoleaks, and destroying local vascular endothelial functions. Currently, there is no effective and convenient technology to solve these problems.

Contents of the invention

In view of this, the purpose of the present invention is to provide a stent in the vascular cavity, which can maintain the circulation of blood inside and outside the stent, and at the same time greatly reduce the damage caused by the blood flow to the vascular intima, improve the protection of the vascular intima, and achieve better good therapeutic effect.

The intravascular stent of the present invention includes a tubular stent body, the side wall of the stent body is provided with a through hole communicating with the inside and outside; the center line of the through hole is inclined toward one axial end of the stent body;

Further, a plurality of said through holes are evenly arranged along the circumferential direction and the axial direction of the bracket body, and the inclination directions of the center lines of each through hole are consistent;

Further, the stent body includes a tubular body curled from a resilient plate;

Further, the stent body also includes a strip-shaped rebound block fixed on the inner wall of the tubular body for assisting rebound;

Further, the strip-shaped rebound block is arranged along the circumference of the tubular body, and the inner surface of the strip-shaped rebound block corresponds to the rounded edges on both sides of the tubular body in the axial direction;

Further, the resilient sheet is curled to form an overlapping edge, and the outer surface of the inner overlapping edge and the inner surface of the outer overlapping edge of the overlapping edge are provided with matching locks for hindering the rewinding of the elastic sheet;

Further, the edge of the inner overlapping edge is provided with an operation hole for rewinding the tubular body; the center line of the operation hole is arranged along the axial direction of the tubular body.

The beneficial effect of the present invention is: the stent in the vascular cavity of the present invention, the side wall of the stent body is provided with a through hole communicating with the inside and outside, and the blood circulation inside and outside the stent can be maintained at the branch blood vessel, and the center line of the through hole is directed toward the stent. One end of the body axis is inclined, and the stent in the vascular cavity is placed in such a way that the inner end of the through hole is inclined towards the blood flow direction, which avoids the direct impact of the blood flow on the intima of the vessel, and promotes the flow of blood in the form of laminar flow in the stent, not in the through hole. The eddy current is generated at the place, which greatly reduces the damage caused by the blood flow to the vascular intima, and improves the protection of the vascular intima; at the same time, because most of the vascular intima where the stent is implanted in the vascular cavity is not covered, the local vascular endothelium still maintains its own function , which reduces the interference of the stent on the endothelial function; after the blood flow hits the oblique through hole, the force of expanding the blood vessel is generated, which is conducive to the close attachment of the stent to the blood vessel of the corresponding segment; due to the design of the oblique through hole, The blood that enters between the stent and the blood vessel is easy to flow back into the lumen of the stent, reducing the pressure difference between the outside and the inside of the stent, and avoiding the occurrence of "endoleak" as a complication of the covered stent; due to the dense arrangement of through holes, The space between the through holes is thin and has good flexibility. When the stent needs to buckle, it can be easily achieved by compressing the diameter of the through hole on the small bend side and stretching the diameter of the through hole on the large bend side, and the cavity of the stent The inner surface is always smooth and wrinkle-free. Through the above mechanisms to achieve a better therapeutic effect.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of the present invention;

Fig. 3 is a schematic diagram of a longitudinal section structure of a single side wall of the present invention.

detailed description

Fig. 1 is a schematic structural view of the present invention; Fig. 2 is a schematic cross-sectional structural view of the present invention; Fig. 3 is a schematic structural view of a longitudinal section of a single side wall of the present invention, as shown in the figure: the vascular intraluminal stent of this embodiment includes a tubular The stent body, the side wall of the stent body is provided with a through hole 1 communicating with the inside and outside; the center line of the through hole 1 is inclined to the axial end of the stent body, which can maintain the circulation of blood inside and outside the stent, and at the same time make the blood vessel cavity The inner stent is placed in such a way that the inner end of the through hole 1 is inclined towards the blood flow direction, so that the blood flows in the form of laminar flow in the stent in the vascular cavity, and no vortex is generated at the through hole 1, which greatly reduces the damage caused by the blood flow to the vascular intima , to improve the protection of the vascular intima, to achieve a better therapeutic effect.

In this embodiment, a plurality of through holes 1 are evenly arranged along the circumferential direction and axial direction of the stent body, the inclination directions of the center lines of each through hole 1 are consistent, and the density of through holes 1 is reasonably set according to needs, and a plurality of through holes are arranged 1 It can meet the permeability inside and outside the stent body, reduce the coverage of the intima of the blood vessel, so as to maintain the circulation of blood inside and outside the stent.

In this embodiment, the stent body includes a tubular body 2 curled from a resilient sheet material, which is convenient for the manufacture of the stent body and the processing of the through hole 1, and reduces manufacturing costs. At the same time, the stent body can be rolled into a smaller diameter Clamp it with a special device after it is cylindrical, and then send it to the corresponding position in the blood vessel to release it. Utilize the rebound performance of the elastic plate to expand and support the inner wall of the blood vessel, which is easy to operate.

In this embodiment, the stent body also includes a strip-shaped rebound block 3 fixed on the inner wall of the tubular body 2 for assisting rebound, further ensuring the rebound performance of the stent body, increasing the supporting force on the inner wall of the blood vessel, and ensuring treatment effect, and at the same time stabilize the positioning of the stent in the vascular cavity; one strip-shaped rebound block 3 is arranged at each end of the stent body in the axial direction, or more can be evenly distributed in the middle of the stent body in the axial direction according to the need for resilience. By arranging the strip-shaped resilient blocks 3 at both axial ends of the stent body, the axial ends of the stent body can be closely attached to the inner wall of the blood vessel, resisting the impact of blood flow, and avoiding the separation of the stent in the vascular lumen from the blood vessel.

In this embodiment, the strip-shaped rebound block 3 is arranged along the circumferential direction of the tubular body 2, and the inner surface of the strip-shaped rebound block 3 corresponds to the rounded edges of the axial sides of the tubular body 2; it has a certain guide for blood flow Function, reduce the obstruction to the blood, make the blood flow in the form of laminar flow in the stent in the vascular lumen.

In this embodiment, the elastic sheet material is curled to form an overlapping edge, and the outer surface of the inner overlapping edge 4 and the inner surface of the outer overlapping edge 5 of the overlapping edge are provided with matching parts for hindering the rebound of the elastic sheet material. The buckle 6 of the roll, hindering the rewinding of the elastic sheet means that the elastic sheet expands to form the tubular body 2 to generate a certain holding force, so that the structure of the tubular body 2 is relatively stable, and the outer surface of the inner lap edge 4 refers to the inner lap edge 4 along the radially outward side of the tubular body 2, the inner side of the outer lapping edge 5 refers to the radially inward side of the outer lapping edge 5 along the tubular body 2, through the resilience of the tubular body 2 itself the inner The overlapping edge 4 and the outer overlapping edge 5 are tightly pressed together, and the lock buckle 6 is a tooth-shaped structure that can be engaged, and then the engagement of the lock buckle 6 is used to hinder the rewinding of the resilient sheet material, so that the structure of the resilient sheet material is stable after expansion. Through the adjustment of the lock, the diameter of the stent can be adjusted according to the change of the vessel lumen to achieve the purpose of fully expanding and supporting the blood vessel; the lock can effectively prevent the stent from rebounding and ensure the support effect of the stent.

In this embodiment, the edge of the inner overlapping edge 4 is provided with an operation hole 7 for rewinding the tubular body 2; the center line of the operation hole 7 is arranged axially along the tubular body 2, and can be used similar to tweezers The tool rolls up the resilient plate through the operation hole 7, which facilitates the placement and removal of the stent in the blood vessel cavity.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (5)

1. A stent in a blood vessel cavity, characterized in that: it comprises a tubular stent body, and the side wall of the stent body is provided with a through hole communicating with the inside and outside; the center line of the through hole is inclined to the axial end of the stent body; The stent body includes a tubular body curled from a resilient plate; the stent body also includes a strip-shaped resilient block fixed to the inner wall of the tubular body for assisting rebound. 2 . The intravascular stent according to claim 1 , wherein a plurality of said through holes are evenly arranged along the circumferential direction and the axial direction of the stent body, and the inclination directions of the center lines of each through hole are consistent. 3 . 3. The vascular endoluminal stent according to claim 1, characterized in that: the strip-shaped resilient block is arranged along the circumferential direction of the tubular body and the inner surface of the strip-shaped resilient block is rounded corresponding to the axial edges on both sides of the tubular body horn. 4. The intravascular stent according to claim 1, characterized in that: the resilient plate is crimped to form an overlapping edge, and the outer surface of the inner overlapping edge and the inner surface of the outer overlapping edge of the overlapping edge are set There are matching latches to resist the rewinding of the resilient sheet. 5. The vascular endoluminal stent according to claim 4, characterized in that: the edge of the inner overlapping edge is provided with an operation hole for rewinding the tubular body; the center line of the operation hole is along the axis of the tubular body direction settings.