CN115624422A

CN115624422A - Blood vessel support

Info

Publication number: CN115624422A
Application number: CN202211629236.2A
Authority: CN
Inventors: 郑殿会; 于明
Original assignee: Beijing Xinyou Medical Technology Co ltd
Current assignee: Beijing Xinyou Medical Technology Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-01-20
Anticipated expiration: 2042-12-19
Also published as: CN115624422B

Abstract

The invention provides a blood vessel support, which relates to the technical field of medical appliances, and comprises: the number of the bracket units is at least two; and one end of the connecting structure is rotatably connected with one of the two adjacent bracket units, and the other end of the connecting structure is rotatably connected with the other of the two adjacent bracket units. When one of the support units is subjected to external force applied to the support unit by a blood vessel, the support unit generates certain deformation and firstly transmits the external force to the connecting structure, so that relative rotation is generated between the support unit and the connecting structure, and the external force of tension, compression and torsion is released by the relative movement of the support unit and the connecting structure, so that the deformation of the support unit adjacent to the support unit influenced by the external force is reduced.

Description

Blood vessel support

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vascular stent.

Background

Currently, for serious vascular diseases, especially vascular occlusion diseases, the body can be seriously affected, and a blood vessel needs to be opened through operation, most commonly, a saccule-expandable stent or a self-expandable stent is conveyed to a vascular affected part through a vascular intervention technology to open the blood vessel.

The existing support is integrally formed through a hollow-out technology, namely, the support units and the connecting parts for connecting the two adjacent support units are integrally formed. One type of stent is an active release type, such as a balloon stent, which requires folding (compression) into a delivery catheter and then actively spreading the stent out after it has entered the target site. The other form is a self-expanding stent, the self-expanding stent can self-expand from a compressed state to an expanded state, and after the compressed self-expanding stent is delivered into a human body lumen from a delivery catheter, the compressed self-expanding stent can self-expand to the expanded state after losing the limitation of the delivery catheter and is in contact with the wall of the lumen.

After the stent is implanted into a human body, the diameters of different sections of blood vessels are inconsistent due to calcification and the like, namely, the diameter of a certain section of stent is expanded by only 10mm (the diameter of a seriously diseased blood vessel is smaller). The diameter of the other section of the stent is expanded by 14mm (the diameter of the less serious lesion blood vessel is larger). Under this condition, for the rigid connection between traditional support unit and the unit, will influence each other, that is to say, certain support unit produces deformation after receiving the pressure that the blood vessel was exerted, this support unit can drive rather than adjacent support unit through connecting portion and move together to make driven support unit receive the external force that adjacent support unit was exerted and the external force that the blood vessel was exerted simultaneously, driven support unit atress is uneven and easily breaks, broken support unit probably pierces through the blood vessel, causes the most serious injury to the health, longer support, the more that this kind of condition takes place.

Disclosure of Invention

The invention aims to provide a vascular stent, which solves the technical problems that the flexibility of the existing vascular stent is poor, and one stent unit in the vascular stent is compressed to deform and then drives the adjacent stent unit to move together.

The embodiment of the invention provides a blood vessel bracket, which comprises: the number of the bracket units is at least two;

and one end of the connecting structure is rotatably connected with one of the two adjacent bracket units, and the other end of the connecting structure is rotatably connected with the other of the two adjacent bracket units.

Furthermore, the connecting structure comprises an extending part and connecting parts positioned at two ends of the extending part, and the connecting parts are used for being rotatably connected with the bracket unit.

Further, the extension portion is telescopic.

Further, the extension part is in a spring shape.

Further, the extension part comprises a sliding sleeve, one end of the sliding sleeve is provided with an opening, and the other end of the sliding sleeve is connected with the connecting part;

the extension part also comprises a sliding tube core, one end of the sliding tube core is inserted into the inner side of the sliding sleeve from the opening, and the other end of the sliding tube core is connected with the connecting part;

a limiting structure is arranged between the sliding sleeve and the sliding tube core, and the limiting structure limits a sliding interval so as to limit the sliding tube core to generate relative movement relative to the sliding sleeve in the limited sliding interval.

Furthermore, the limiting structure comprises a first annular convex rib which is arranged on the inner wall of the sliding sleeve and protrudes towards the axial direction of the sliding sleeve, and the limited sliding interval is formed between the first annular convex rib which is farthest away from the opening of the sliding sleeve and the end surface of one end of the sliding sleeve back to the opening of the sliding sleeve;

the limiting structure comprises a second annular convex rib which is arranged on the outer wall of the sliding tube core and protrudes towards the circumferential outer side of the sliding tube core, and the second annular convex rib is connected in a sliding mode in the limited sliding interval and is limited by the first annular convex rib in a stopping mode.

Furthermore, along the axial direction of the sliding sleeve, the number of the first annular convex ribs is at least two, and the interval between every two adjacent first annular convex ribs also forms the limited sliding interval;

the second annular rib may cross the first annular rib when an external axial force acting on the sliding sleeve and the sliding tube core is greater than a preset value.

Further, the material of the connecting structure is degradable material.

Furthermore, the support unit comprises a plurality of support parts, the support parts are sequentially connected end to form a ring shape, and two adjacent support parts are arranged at an included angle; in two adjacent bracket units, one end of the supporting part of any one bracket unit, which is close to the other bracket unit, is a near end, and the other end of the supporting part is a far end;

one end of the connecting structure is rotatably connected with the near-end joint of the two support parts in one of the bracket units, or one end of the connecting structure is rotatably connected with the far-end joint of the two support parts in one of the bracket units;

the other end of the connecting structure is rotatably connected with the near-end joint of the two support parts in the other support unit, or the other end of the connecting structure is rotatably connected with the far-end joint of the two support parts in the other support unit.

Further, there is at least difference in thickness of the support portions of the adjacent two stand units.

Further, the connecting part comprises a C-shaped buckle, and the C-shaped buckle is buckled on the bracket unit; or, the connecting part comprises an O-shaped ring which encircles the bracket unit.

The embodiment of the invention provides a blood vessel bracket, which comprises: the number of the bracket units is at least two; and one end of the connecting structure is rotatably connected with one of the two adjacent bracket units, and the other end of the connecting structure is rotatably connected with the other of the two adjacent bracket units. When one of the support units is subjected to external force applied to the support unit by a blood vessel, the support unit generates certain deformation and firstly transmits the external force to the connecting structure, so that relative rotation is generated between the support unit and the connecting structure, and the external force of tension, compression and torsion is released by the relative movement of the support unit and the connecting structure, so that the deformation of the support unit adjacent to the support unit influenced by the external force is reduced. The split type blood vessel stent has the advantages that the two adjacent stent units are connected through the connecting structure in a split mode, the stent units are rotatably connected with the connecting structure, the stent units are mutually connected, mutual interference is reduced, the stent units are mutually independent, the flexibility of the blood vessel stent is improved, the stress of the stent units is uniform, and the stent units are not easy to break.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a vascular stent provided in example 1 of the present invention;

FIG. 2 is a side view of a vascular stent provided in example 1 of the present invention;

fig. 3 is a front view of a vascular stent provided in embodiment 1 of the present invention;

fig. 4 is a schematic view of a connection structure of a vascular stent provided in example 1 of the present invention;

FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a side view of another stent provided in example 1 of the present invention;

fig. 7 is a schematic view of the intravascular stent provided in embodiment 1 of the present invention positioned in a lumen.

Icon: 100-a scaffold unit; 110-a proximal end; 120-distal end;

200-a connecting structure; 210-a connecting portion; 220-a sliding sleeve; 221-a first annular bead; 230-sliding the die; 231-second annular bead; 240-define a sliding interval.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 3, the blood vessel stent provided by the embodiment of the invention comprises a stent unit 100, wherein the stent unit 100 has a certain amount of expansion and contraction in a radial direction, that is, the stent unit 100 can generate a certain amount of deformation under the pressure of a blood vessel.

Specifically, the support unit 100 may include a plurality of support portions, the support portions are sequentially connected end to form a ring shape, and two adjacent support portions are arranged at an included angle. The support part can be in a straight rod shape or a curved rod structure with a certain curvature. The included angle formed by two adjacent supporting parts can be an acute angle, the range of the included angle can be 20-60 degrees, and the included angle can also be other angles.

The number of the stent units 100 is at least two, and generally, the number of the stent units 100 is multiple and can be customized according to the specific position of the blood vessel.

The blood vessel support further comprises a connecting structure 200, one end of the connecting structure 200 is rotatably connected with one of the two adjacent support units 100, and the other end of the connecting structure 200 is rotatably connected with the other of the two adjacent support units 100. When one of the stent units 100 is subjected to an external force applied to the stent unit 100 by a blood vessel, the stent unit 100 will deform to some extent, and the external force will be transmitted to the connecting structure 200 by the stent unit 100 first, so that a relative rotation will be generated between the stent unit 100 and the connecting structure 200, and the external force of tension, compression and torsion will be released by the relative movement of the stent unit 100 and the connecting structure 200, thereby reducing the deformation of the stent unit 100 adjacent to the stent unit 100 affected by the external force. The two adjacent support units 100 are connected through the connecting structure 200 in a split mode, the support units 100 and the connecting structure 200 are in a rotating connection relationship, so that the support units 100 are mutually connected, mutual interference is reduced, the support units 100 are mutually independent, the flexibility of the intravascular stent is improved, and the support units 100 are uniformly stressed and are not easy to break.

The number of the connecting structures 200 connected between two adjacent rack units 100 may be a plurality, and the number may be three, four, five, or more, and the plurality of connecting structures 200 are arranged in sequence around the axis of the rack unit 100, so as to form a stable connection relationship.

The connecting structure 200 includes an extending portion and connecting portions 210 at two ends of the extending portion, wherein the connecting portions 210 are used for being rotatably connected with the rack unit 100.

In this embodiment, the connection structure 200 is rotatably connected to the bracket unit 100 through the connection portion 210, specifically, the connection portion 210 may include a C-shaped buckle, and the C-shaped buckle is buckled on the support portion of the bracket unit 100, where the C-shaped buckle is specifically a circular elastic collar with an inner and an outer gap of the communication ring. Under the action of external force, the connection part 210 can be removed from the support part, thereby shortening the length of the vascular stent and using different surgical requirements. Similarly, under the action of external force, the openings of the C-shaped buckles can be enlarged, and a plurality of support units are spliced, so that the blood vessel support is prolonged, and the use scene of the blood vessel support is expanded.

The connection portion 210 includes but is not limited to a C-shaped snap, and may be an O-ring or other shape of soft material connection. The O-ring may be looped around the support portion of the cradle unit 100.

As shown in fig. 7, the extension may extend in an axial direction, and in an embodiment, the extension may be a telescopic structure, so that the length of the connection structure 200 in the axial direction may be variable. After the vascular stent is implanted into a human body, the diameters of different sections of blood vessels are inconsistent due to calcification and the like, namely, the diameter of a certain section of stent unit 100 is expanded by only 10mm (the diameter of a seriously diseased blood vessel is smaller). Another section of the stent unit 100 is expanded by 14mm in diameter (less severe lesion vessel diameter is larger). In this case, the stent units 100 are flexibly connected with each other in an adjustable manner, and the influence on each other is small, that is, when one of the stent units 100 is subjected to an external force applied to it by a blood vessel, a certain deformation will occur, the stent unit 100 will firstly transmit the external force to the connecting structure 200, so that a relative rotation will occur between the stent unit 100 and the connecting structure 200, and at the same time, an extension part will also undergo an elongation or contraction action, the relative movement between the stent unit 100 and the connecting structure 200, and the extension and contraction deformation of the extension part can further release the external force of tension, compression, and torsion, so as to reduce the deformation of the stent unit 100 adjacent to the stent unit 100 affected by the external force. The two adjacent bracket units 100 are connected through the connecting structure 200 in a split mode, the bracket units 100 and the connecting structure 200 are in a rotating connection relationship, and the connecting structure 200 can stretch and retract, so that the bracket units 100 are mutually connected, and mutual interference is reduced. The stent units 100 and the connection structure 200 can be rotated with each other or the stent units 100 can be axially moved or bent with a certain force, that is, the compression or expansion between one stent unit 100 is not substantially affected by the compression or expansion of the other stent unit 100, the flexibility of the stent is improved, and the stent units 100 are uniformly stressed and are not easily broken.

As shown in fig. 4 and 5, the extension part includes a sliding sleeve 220, one end of the sliding sleeve 220 has an opening, and the other end of the sliding sleeve 220 is connected with the connecting part 210; the extension part further comprises a sliding tube core 230, one end of the sliding tube core 230 is inserted into the inner side of the sliding sleeve from the opening, and the other end of the sliding tube core 230 is connected with the connecting part 210; a limiting structure is disposed between the sliding sleeve 220 and the sliding core 230, and the limiting structure defines a sliding interval 240 to limit the relative movement of the sliding core 230 with respect to the sliding sleeve 220 within the limited sliding interval 240.

The extension may be of a sleeve construction, i.e. comprising a sliding sleeve 220 slidably connected and a sliding core 230 slidably connected inside the sliding sleeve 220. Specifically, in this embodiment, the left end face of the sliding sleeve 220 may have an opening, while the right end face is a closed structure, and the closed right end face is connected to the connecting portion 210. The left end face of the sliding core 230 is connected to the connection portion 210, and the right end face is inserted into the opening, so that a portion of the sliding core 230 is slidably connected inside the sliding sleeve 220. By pushing and pulling the two connecting portions 210 at the two ends, the overlapping portion of the sliding core 230 and the sliding sleeve 220 can be increased or decreased, and the axial length of the connecting structure 200 can be increased or decreased.

To prevent the sliding tube core 230 from sliding out of the sliding tube 220, a limiting structure is provided between the sliding tube 220 and the sliding tube core 230, which limits the limited sliding interval 240 in the axial direction, i.e. the sliding tube core 230 only slides in the limited sliding interval 240, thereby limiting the maximum and minimum extension or contraction range of the connecting structure 200.

The limiting structure comprises a first annular convex rib 221 which is arranged on the inner wall of the sliding sleeve 220 and protrudes towards the axial direction of the sliding sleeve 220, and the limited sliding area 240 is formed between the first annular convex rib 221 which is farthest away from the opening of the sliding sleeve 220 and the end surface of one end of the sliding sleeve 220 back to the opening; the limiting structure comprises a second annular rib 231 which is arranged on the outer wall of the sliding tube core 230 and protrudes towards the circumferential outer side of the sliding tube core 230, and the second annular rib 231 is slidably connected in the limited sliding interval 240 and is limited by being stopped by the first annular rib 221.

The inner diameter of the first annular rib 221 is smaller than the outer diameter of the second annular rib 231, and the second annular rib 231 cannot pass over the first annular rib 221 only under the action of the vascular pressure, so that a stop relationship is formed, and a limited sliding region 240 is defined between the first annular rib 221 and the end face of the sliding sleeve 220 through mutual stop of the first annular rib 221 and the second annular rib 231. That is, only by the pressure of the blood vessel, the sliding sleeve 220 and the sliding core 230 can be moved between the first annular rib 221 and the end face of the sliding sleeve 220, thereby releasing a part of the pressure and preventing the pressure from being transmitted to the adjacent stent unit 100. The connecting structure 200 is skillfully designed, consists of a sliding sleeve 220 and a sliding tube core 230, realizes relative free rotation with the bracket unit 100, and has limited extension and contraction of the extension part, thereby enhancing the flexibility of the blood vessel bracket. The connection structure 200 and the stent units 100 are connected in a manner that ensures an integrated structure, and different stent units 100 can change the expansion size relatively independently, so that the interference between the different stent units is reduced.

In the axial direction of the sliding sleeve 220, the number of the first annular ribs 221 is at least two, and the interval between two adjacent first annular ribs 221 also forms the limited sliding interval 240; the second annular rib 231 may pass over the first annular rib 221 when an axial external force acting on the sliding sleeve 220 and the sliding core 230 is greater than a preset value.

The limited sliding area 240 is formed between the first annular rib 221, which is farthest from the opening of the sliding sleeve 220, of the plurality of first annular ribs 221 and the end surface of the sliding sleeve 220, and between two adjacent first annular ribs 221.

The number of first annular ribs 221 determines the number of defined sliding sections 240 and also determines the range of maximum and minimum lengths of the extension. The difference between the inner diameter and the outer diameter of the first annular rib 221 and the second annular rib 231 can be set to be smaller than the maximum deformation amount of the first annular rib 221 or the second annular rib 231, that is, when the axial external force acting on the sliding sleeve 220 and the sliding tube core 230 is large, the first annular rib 221 or the second annular rib 231 can deform to a certain extent, so that the second annular rib 231 can cross the first annular rib 221, enter the adjacent limited sliding interval 240, so that the maximum value and the minimum value of the length expansion range of the extension part can be changed, and different operation requirements can be met. The user may pull or push the connection structure 200 outward or inward according to the surgical requirements during preoperative preparation, thereby changing the defined sliding interval 240 in which the second annular rib 231 is located.

The material of the connecting structure 200 may be a degradable material.

The material of the stent unit 100 may be a degradable metallic material, such as (1) austenitic stainless steel (316 LSS); (2) cobalt chromium alloys; (3) medical tantalum; (4) titanium and its alloys; and (5) nickel titanium shape memory alloy. The material of the connection structure 200 may be degradable material, and the degradable biological material may be degradable polymer material, bioceramic, magnesium-based alloy, iron-based alloy, etc. After a period of time in the human body, the connection structure 200 is degraded, and each of the stent units 100 forms an independent individual, so that the interaction force between the stent units 100 is completely lost, thereby fundamentally avoiding the problem of uneven stress of the stent units 100 caused by the mutual pushing and pulling between the adjacent stent units 100.

In two adjacent rack units 100, one end of the support part of any one rack unit 100 close to the other rack unit 100 is a proximal end 110, the other end is a distal end 120, and the joint between the two adjacent support parts may be an arc transition.

In a first possible embodiment, as shown in fig. 2, one end of the connecting structure 200 is rotatably connected to the joint of the proximal ends 110 of the two supporting portions in one of the rack units 100, and the other end of the connecting structure 200 is rotatably connected to the joint of the proximal ends 110 of the two supporting portions in the other rack unit 100.

In a second possible embodiment, one end of the connecting structure 200 is rotatably connected to the joint of the distal ends 120 of the two support portions in one of the rack units 100, and the other end of the connecting structure 200 is rotatably connected to the joint of the distal ends 120 of the two support portions in the other rack unit 100.

In a third possible embodiment, as shown in fig. 6, one end of the connecting structure 200 is rotatably connected to the joint of the proximal ends 110 of the two supporting portions in one of the rack units 100, and the other end of the connecting structure 200 is rotatably connected to the joint of the distal ends 120 of the two supporting portions in the other rack unit 100.

The thicknesses of the supporting parts of at least two adjacent stent units 100 are different, so that the two stent units 100 with different hardness degrees exist on the same vascular stent, and the flexibility is further increased.

Example 2

In terms of the telescopic form of the extension, the difference from embodiment 1 is that the extension may be spring-shaped. The spring-like extension part extending spirally in the axial direction can generate an extending or contracting movement in the axial direction and also can generate a swinging movement relative to the axial line, so that the external force of tension, compression and torsion is released, and the deformation of the bracket unit 100 adjacent to the bracket unit 100 influenced by the external force is reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vascular stent, comprising: the number of the bracket units (100) is at least two;

one end of the connecting structure (200) is rotatably connected with one of the two adjacent bracket units (100), and the other end of the connecting structure (200) is rotatably connected with the other of the two adjacent bracket units (100).

2. Vessel support according to claim 1, wherein the connection structure (200) comprises an extension and connection parts (210) at both ends of the extension, the connection parts (210) being adapted for rotational connection with the support unit (100).

3. The vascular stent of claim 2, wherein the extension is telescopic.

4. The vascular stent of claim 3, wherein the extension is spring-like.

5. The vessel support according to claim 3, wherein the extension part comprises a sliding sleeve (220), one end of the sliding sleeve (220) is provided with an opening, and the other end of the sliding sleeve (220) is connected with the connecting part (210);

the extension part further comprises a sliding tube core (230), one end of the sliding tube core (230) is inserted into the inner side of the sliding sleeve (220) from the opening, and the other end of the sliding tube core (230) is connected with the connecting part (210);

a limiting structure is arranged between the sliding sleeve (220) and the sliding tube core (230), and the limiting structure limits a sliding interval (240) so as to limit the sliding tube core (230) to generate relative movement in the limited sliding interval (240) relative to the sliding sleeve (220).

6. The blood vessel support according to claim 5, wherein the limiting structure comprises a first annular rib (221) which is arranged on the inner wall of the sliding sleeve (220) and protrudes towards the axial direction of the sliding sleeve (220), and the limited sliding interval (240) is formed between the first annular rib (221) which is farthest away from the opening of the sliding sleeve (220) and one end face of the sliding sleeve (220) which faces away from the opening of the sliding sleeve;

the limiting structure comprises a second annular convex rib (231) which is arranged on the outer wall of the sliding tube core (230) and protrudes towards the circumferential outer side of the sliding tube core (230), and the second annular convex rib (231) is connected in the limited sliding interval (240) in a sliding mode and is limited by the stop of the first annular convex rib (221).

7. Vessel support according to claim 6, wherein the number of the first annular ribs (221) in the axial direction of the sliding sleeve (220) is at least two, and the interval between two adjacent first annular ribs (221) also forms the defined sliding interval (240);

the second annular bead (231) may pass over the first annular bead (221) when an external axial force acting on the sliding sleeve (220) and the sliding die core (230) is greater than a preset value.

8. Vessel support according to any one of claims 1 to 7, wherein the material of the connection structure (200) is a degradable material.

9. The blood vessel support according to any one of claims 1 to 7, wherein the support unit (100) comprises a plurality of support parts, the support parts are sequentially connected end to form a ring shape, and two adjacent support parts are arranged at an included angle; in two adjacent bracket units (100), one end of the supporting part of any one bracket unit (100) close to the other bracket unit (100) is a near end (110), and the other end is a far end (120);

one end of the connecting structure (200) is rotatably connected with the joint of the proximal ends (110) of the two supporting parts in one bracket unit (100), or one end of the connecting structure (200) is rotatably connected with the joint of the distal ends (120) of the two supporting parts in one bracket unit (100);

the other end of the connecting structure (200) is rotatably connected with the joint of the near ends (110) of the two supporting parts in the other bracket unit (100), or the other end of the connecting structure (200) is rotatably connected with the joint of the far ends (120) of the two supporting parts in the other bracket unit (100).

10. Vessel support according to claim 9, characterized in that there are at least two support portions of adjacent support units (100) having different thicknesses.

11. Vessel support according to any one of claims 2 to 7, characterized in that the connecting portion (210) comprises a C-shaped snap-fit which snaps onto the support unit (100); alternatively, the connection part (210) comprises an O-ring, which encircles the holder unit (100).