CN216702731U

CN216702731U - Cutting support

Info

Publication number: CN216702731U
Application number: CN202023324760.8U
Authority: CN
Inventors: 谭凯华; 李安伟
Original assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Current assignee: Hangzhou Wei Qiang Medical Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-06-10
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a cutting bracket, relating to the field of medical instruments, comprising: a main body section including a plurality of main body support loops formed by a wire wound to extend helically between the two ends of the cutting support; and the end supporting ring is connected with one end of the main body section and comprises a plurality of end supporting rods which are sequentially connected in an angle mode, adjacent end supporting rods are close to one side of the main body section and are mutually connected to form end wave troughs, the end wave troughs comprise a plurality of large wave troughs, and the large wave troughs are closer to the main body section in the axial direction compared with the adjacent end wave troughs. The cutting support provided by the utility model has better flexibility and flexibility.

Description

Cutting support

Technical Field

The utility model relates to the field of medical instruments, in particular to a cutting support.

Background

Vascular diseases are diseases with high morbidity, and if the diseases can cause vascular blockage, aneurysm and the like, the life safety of human beings is seriously harmed. At present, the vascular diseases can be treated by adopting minimally invasive intervention, and the method has the advantages of small wound to patients and high safety and effectiveness, so the method is determined by doctors and patients to become an important treatment method for the vascular diseases. The interventional therapy method is characterized in that a stent is implanted into a diseased blood vessel section of a patient by using a conveying system, the implanted stent can support a blood vessel of a stenotic occlusion section or block a laceration of a blood vessel interlayer by expansion, the elastic retraction and the reshaping of the blood vessel are reduced, the blood flow of a lumen is kept smooth, and the effect of preventing restenosis is achieved.

Among the performance indexes of the stent, the compliance performance of the stent plays an important role in the clinical effect in the surgical process and after the surgery. The flexibility affects the ability of the stent to straighten blood vessels during and after operation, reflecting the safety problem of the stent product.

The implant stent is usually made of 316L stainless steel, cobalt-chromium alloy, nickel-titanium alloy, magnesium alloy or polymer material. The nickel-titanium alloy is preferably used for the self-expanding stent material because of the characteristics of high strength, fatigue resistance, corrosion resistance, wear resistance, good shape memory effect, good biocompatibility and the like, and although the self-expanding stent has the advantages, the structural design of the stent can directly influence the flexibility of the stent. Although the stent can be pressed on the conveyor, the over-bending capability of the stent in the conveying conduit can be influenced by the compliance performance of the stent, the blood vessel can be straightened or the lesion part can be difficultly reached due to poor compliance, and even if the lesion part is reached, the pressure of a metal wave ring of the stent on the blood vessel wall is high, and the biocompatibility is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cutting stent, aiming at the problems that the flexibility and the flexibility of an implanted stent are not good in the treatment process when the existing vascular disease is treated by adopting an interventional therapy method.

The technical scheme provided by the utility model for the technical problem is as follows:

the present invention provides a cutting stent comprising:

a main body section including a plurality of main body support rings formed by a wire wound to spirally extend between both ends of the cutting stent; and

the end supporting ring is connected to the end part of the main body section and comprises a plurality of end supporting rods which are sequentially connected in an angle mode, adjacent end supporting rods are close to one side of the main body section and are connected with each other to form end wave troughs, the end wave troughs comprise a plurality of large wave troughs, and the large wave troughs are closer to the main body section in the axial direction compared with the adjacent end wave troughs.

According to the above cutting stent, the end supporting rings comprise high-low wave winding wires and transition rods, the transition rods are connected between the end supporting rods at two ends of the high-low wave winding wires in the circumferential direction, the high-low wave winding wires comprise a plurality of end wave troughs, the end wave troughs comprise small wave troughs and large wave troughs which are alternately arranged, and the large wave troughs are closer to the main body section in the axial direction than the adjacent small wave troughs.

According to the cutting support, the two ends of the high-low wave winding in the circumferential direction are respectively a first end and a second end, and the length of the end supporting rod located at the first end is shorter than that of the end supporting rod located at the second end.

According to the above-described cutting stent, from the first end to the second end,

the length of the end supporting rod forming the large wave trough is gradually increased,

the length of the end supporting rod forming the small wave trough is gradually increased.

According to the above cutting support, the width of the end support bar gradually increases from the first end to the second end.

According to the cutting support, the adjacent end supporting rods are connected with each other at one side far away from the main body section to form a plurality of end wave crests which are flush.

According to the cutting bracket, the end supporting rod at the first end is a first rod, the transition rod is also connected with the winding wire, the main body supporting rod comprises a main body supporting rod which is sequentially connected in an angle manner, the main body supporting rod connected with the transition rod is a second rod,

the width of the transition bar is greater than the width of the first bar and the width of the transition bar is greater than the width of the second bar.

According to the cutting support described above, the first bar is connected at a first transition point of the transition bar and the second bar is connected at a second transition point of the transition bar.

According to the above-mentioned cutting support, the first transition point is located at an end position of the transition bar on a side away from the main body section, and the second transition point is located at a middle position of the transition bar.

According to the cutting support, the first transition point and the second transition point are at the same position.

According to the cutting support, the first transition point and the second transition point are both located at the end part of the transition rod, and the first transition point is located between two ends of the end support ring in the axial direction.

According to the above cutting stent, the first rod and the second rod extend in different directions from each other in the proximal direction and the distal direction, respectively.

According to the cutting stent, the adjacent end support bars are connected with each other at the side far away from the main body section to form the end wave peak, and the width of the end wave peak and/or the end wave trough formed by at least one end support bar is larger than the width of other parts of the at least one end support bar.

According to the cutting stent, the cutting stent is provided with the end support rings at the proximal end and the distal end of the main body section, respectively.

According to the cutting support, connecting rods are arranged between the adjacent main body support rings and the end support rings.

According to the cutting support, the cutting support is also provided with a coating film.

According to the cutting support, the end support ring is provided with a plurality of developing rings at intervals on one side far away from the main body section.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects:

according to the cutting stent provided by the utility model, the main body section is formed by spirally extending a winding wire between the near end and the far end, so that the flexibility and the flexibility of the main body section are improved. Meanwhile, the end supporting rods which are connected at an angle mutually form a plurality of large wave troughs, and the large wave troughs are closer to the main body section in the axial direction than the adjacent end wave troughs, so that gaps between the end supporting ring and the main body supporting ring are increased, the flexibility and the flexibility between the end supporting ring and the main body supporting ring are improved, in conclusion, the flexibility and the flexibility between the main body section and the main body section as well as the end supporting ring are improved, the smaller bending radius is easier to realize so as to adapt to the larger bending angle of the blood vessel, and the adaptability of the cutting support and the main body supports with different model sizes is improved.

Through the corresponding structure setting to main part lock ring, tip lock ring and main part section and tip lock ring hookup location department, not only guaranteed the holistic homogeneity of cutting support and to the good supporting effect of vascular wall, still be favorable to improving the fatigue resistance ability of cutting support, reduce stress concentration regional deformation or even cracked probability, avoid causing because of cutting support breaks and impale the emergence of situations such as blood vessel even to the damage of vascular wall.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a first embodiment of a cutting stent in a contracted state according to the present invention;

FIG. 2 is a schematic view of a cutting stent according to the present invention after expansion in a first embodiment;

FIG. 3 is a schematic view of a second embodiment of a contracted state of a cutting stent according to the present invention;

FIG. 4 is a schematic view of a third embodiment of a contracted state of a cutting stent provided in accordance with the present invention;

FIG. 5 is a schematic view of a cutting stent according to the present invention after expansion in a third embodiment;

FIG. 6 is a schematic view of a fourth embodiment of a cutting stent in a contracted state according to the present invention;

FIG. 7 is a schematic view of a fifth embodiment of a cutting support according to the present invention in a contracted state;

fig. 8 is a schematic structural view of a sixth embodiment of a cutting stent in a contracted state according to the present invention.

The labels in the figures illustrate:

1. 2, 3, 4, 5, 6, cutting the bracket;

11. 21, 31, 41, 51, 61, body segment;

111. 211, 311, 411, 511, 611, a body support ring;

1111. 2111, 3111, 4111, 5111, 6111, body support bar;

1112. 2112, 3112, 4112, 5112, 6112, second rod;

12. 22, 32, 42, 52, 62, end support rings;

121. 221, 321, 421, 521, 621, end support bar;

1211. 2211, 3211, 4211, 5211, 6211, high-low wave winding;

1212. 2212, 3212, 4212, 5212, 6212, transition rod;

12121. 22121, 32121, 42121, 52121, 62121, a first transition point;

12122. 22122, second transition point;

1213. 2213, 3213, 4213, 5213, 6213, first rod;

122. 222, 322, 422, 522, 622, end valleys;

1221. 2221, 3221, 4221, 5221, 6221, large valley;

1222. 2222, 3222, 4222, 5222, 6222, wavelet valley;

13. 23, 33, 43, 53, 63, connecting rod;

14. 24, 34, 44, 54, 64, developer ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the field of interventional medical devices, the end of the implanted medical device that is closer to the heart is the proximal end and the end that is farther from the heart is the distal end, along the direction of blood flow, and the proximal and distal ends of any component of the medical device are defined according to this principle. The following embodiments may be applied to each other without departing from the technical principle of the present application.

The cutting stent provided by the utility model is mainly applied to a main stent implanted in an aorta and is used as a branch stent of the main stent to realize corresponding functions.

First embodiment

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a first embodiment of a cutting stent in a contracted state according to the present invention; fig. 2 is a schematic structural view of a first embodiment of the cutting stent provided by the present invention after expansion, specifically, a deployed structure obtained by longitudinally cutting a cylindrical cutting stent. The cutting stent 1 comprises a main body segment 11 and end support rings 12 connected to the ends of the main body segment 11, wherein the main body segment 11 comprises a plurality of main body support rings 111 formed by a winding wire spirally extending between two ends of the cutting stent 1. In one embodiment, the main support ring 111 is directly connected to the end support ring 12, while in another embodiment, the main support ring 111 is connected to the end support ring 12 through a coating.

Here, the body support ring 111 includes body support rods 1111 that are sequentially connected at an angle, and the body support rods 1111 are connected to each other in a sine wave or other waveform. In the present application, "angularly connected" means that the angle formed between the parts connected to each other is greater than 0 degrees and less than 180 degrees.

The end support rings 12 are connected end to end, and include a plurality of end support bars 121 that are connected in order at an angle, and adjacent end support bars 121 are connected each other at one side close to the main body segment 11 to form an end trough 122, wherein, the end trough 122 is sunken to the main body segment 11 direction, and then include a plurality of big troughs 1221 in the end trough 122, and big trough 1221 is closer to the main body segment 11 than its adjacent end trough 122 in the axial direction, also is that the sunken distance of big trough 1221 to the main body segment 11 direction is greater than the sunken distance of its adjacent end trough 122 to the main body segment 11 direction.

Here, can increase the space between main part section 11 and the tip lock ring 12 in the cutting support 1 through setting up tip trough 122 and big trough 1221 to be favorable to promoting the flexibility and the compliance of cutting support 1, easily realize less bending radius in order to adapt to great vascular bending angle, still improve the suitability of cutting support 1 and the main part support of different model sizes simultaneously.

In this embodiment, the end support ring 12 specifically includes a high-low wave winding 1211 and a transition rod 1212, wherein the transition rod 1212 is connected between the end support rods 121 at two ends of the high-low wave winding 1211 in the circumferential direction, and the high-low wave winding 1211 includes a plurality of end valleys 122. In this embodiment, the end valleys 122 include the small wave valleys 1222 and the large wave valleys 1221 alternately, in which case the small wave valleys 1222 and the large wave valleys 1221 alternately are closer to the main body segment 11 in the axial direction than the adjacent small wave valleys 1221, and the end support ring 12 has improved uniformity and fatigue resistance and is less likely to break.

The high-low wave winding 1211 (located inside the dashed line frame in the figure) has a first end (start end) and a second end (end) at two ends in the circumferential direction, and is connected to the transition rod 1212 to form an end-to-end connection of the end support ring 12. As shown in fig. 1, the rightmost end located in the dashed box on the left side in the drawing and the end connected to the left end of the transition rod 1212 are the second end, and the leftmost end in the dashed box on the right side is the first end where the shortest end support rod 121 connected to the right end of the transition rod 1212 is located. The length of the end support rod 121 at the first end is shorter than the length of the end support rod 121 at the second end, which is advantageous for the overall trapezoidal or trapezoid-like winding distribution of the high and low wave windings 1211 formed by the end support rods 121 sequentially connected from the first end to the second end, and the trapezoidal or trapezoid-like winding distribution can better adapt to the spiral inclined configuration of the main body support ring 111 in the main body segment 11 (the edge inclination of the main body segment formed by the spirally extending windings).

Further, the length of the end support rods 121 forming the large wave troughs 1221 gradually increases from the first end to the second end, and the length of the end support rods 121 forming the small wave troughs 1222 gradually increases, so as to form an inclined edge profile on the side of the end support ring 12 adjacent to the main body segment 11, i.e. to facilitate the overall trapezoidal or trapezoid-like winding distribution of the high and low wave windings 1211 formed by the end support rods 121 connected in sequence from the first end to the second end, wherein the trapezoidal or trapezoid-like winding distribution can better adapt to the spiral inclined configuration (the edge inclination of the main body segment formed by the spirally extending windings) of the main body support ring 111 in the main body segment 11.

The lengths of the end support rods 121 at the positions of the large wave valley 1221 and the small wave valley 1222 are gradually increased, so that the length difference between the adjacent end support rods 121 is not large, the angles between the end support rods 121 connected with each other are relatively uniform after the cutting stent 1 is expanded, and the fatigue tolerance is improved. Preferably, the difference in length between adjacent end support rods 121 is less than a predetermined value, which in some embodiments is half the length of the body support rods 1111, and the length of all of the body support rods 1111 is equal.

The high-low wave winding 1211 may be provided with a plurality of end valleys 122 having a same pitch as the adjacent main body support rings 111, thereby helping to improve the uniformity of the stress of the cutting stent 1 at the position where the high-low wave winding 1211 is adjacent to the main body support rings 111.

Meanwhile, in order to prevent the end support bars 121 having a gradually increasing length from possibly causing a reduction in fatigue resistance, the width of the end support bars 121 is gradually increased from the first end to the second end. Specifically, the width of the end supporting rod 121 is the smallest in the segment near the first end, and the width of the end supporting rod 121 is the largest in the segment near the second end. The width of the end support 121 in each segment is the same, while the width of the end support 121 in different segments is different.

In this embodiment, the end support rod 121 at the first end is defined as a first rod 1213, the main body support rod 1111 connected to the transition rod 1212 is defined as a second rod 1112, and the width of the transition rod 1212 is greater than the widths of the first rod 1213 and the second rod 1112. At the same time, in some embodiments, the length of transition bar 1212 is also greater than the maximum length of end support bar 121. In addition, the magnitude relationship between the width of first shaft 1213 and the width of second shaft 1112 is not limited.

First pole 1213 and second pole 1112 are all connected in transition pole 1212, and the width of transition pole 1212 is greater than the width of first pole 1213, second pole 1112 for after cutting support 1 expands, the wave form of transition pole 1212, first pole 1213 and second pole 1112 department is more even, is favorable to improving the fatigue resistance of transition pole 1212.

First rod 1213 is connected at a first transition point 12121 of transition rod 1212, and second rod 1112 is connected at a second transition point 12122 of transition rod 1212.

In a specific application example, the first transition point 12121 and the second transition point 12122 are located at different positions, as in the transition point setting situation illustrated in fig. 1 and 2: the first transition point 12121 is located at an end position of the transition rod 1212 on a side remote from the main body segment 11, i.e. at a proximal end of the transition rod 1212, while the second transition point 12122 is located at a middle position of the transition rod 1212. The middle position of the transition rod 1212, which is other than the proximal and distal ends of the transition rod 1212, does not define a midpoint in the extension direction of the transition rod 1212, and the second transition point 12122 may be disposed near one of the two ends of the transition rod 1212. The first transition point 12121 and the second transition point 12122 are arranged according to the above-mentioned positions, so that the problems of poor waveform distribution uniformity and uneven supporting force caused by too large or too small metal coverage between the end support ring 12 and the main body segment 11 can be avoided.

In this embodiment, the adjacent end supporting rods 121 are connected to each other at a side away from the main body segment 11 to form a plurality of end wave crests, and the end wave crests are all arranged in parallel. The flush-set end peaks facilitate a better fit or connection with the main stent. In addition, in some specific application examples, since the width of the end supporting rod 121 is gradually increased from the first end to the second end, accordingly, the widths of the end wave peak and the end wave valley near the second end are larger than the widths of the end wave peak and the end wave valley near the first end, this arrangement is used for solving the problem that the uniformity of the waveform caused by the winding of the transition rod 1212 connecting the main body segment 11 is poor, and by increasing the widths of the wave peak and the wave valley, the deformation is not easily caused, and the uniformity and the fatigue resistance of the end supporting ring can be improved.

The connecting rods 13 are provided between adjacent body support rings 111, which can increase the structural strength in the body section 11. As shown in fig. 1 and 2, the body supporting ring 111 includes body supporting rods 1111 connected in an angle in sequence, the adjacent body supporting rods 1111 are connected to each other at the distal end to form body valleys, and the adjacent body supporting rods 1111 are connected to each other at the proximal end to form body peaks. The axially adjacent main body support rings 111 are arranged in a staggered manner, specifically, in two axially adjacent main body support rings 111, the main body wave troughs of the main body support ring 111 at the near end and the main body wave crests of the main body support ring 111 at the far end are staggered in the circumferential direction, so that the flexibility and the flexibility of the main body section 11 are improved.

The connecting rod 113 between the body support rings 111 is connected between the body peaks and the body valleys which are offset from each other in the axial and circumferential directions, so as to extend in the axial and circumferential directions, being a helical screw rod.

The connecting rods 13 are also arranged between the adjacent main body support rings 111 and the end support rings 12, so that the structural strength of the connecting positions of the main body sections 11 and the end support rings 12 can be increased. The connecting rod 13 between the adjacent main body support ring 111 and end support ring 12 is preferably a straight rod.

In this embodiment, the axially adjacent connecting rods 13 are circumferentially staggered, which helps to improve the flexibility of the cutting stent 1. Preferably, the connecting rods 13 in the cutting support 1 are evenly distributed.

In the present embodiment, the cutting stent 1 includes a coating film, which connects the main body support ring 111 and the end support ring 12 by hot-melt and hot-press to form a complete blood flow path.

A plurality of developing rings 14 are arranged at intervals on one side of the end support ring 12 far away from the main body segment 11, each developing ring 14 is arranged at a preset interval, and radiopaque materials are arranged in the developing rings 14 so as to display the end of the cutting support 1 in an imaging mode. In some embodiments, each of the developing rings 14 may be equally spaced, and accordingly, the corresponding end support bar 121 may be spaced three end peaks apart in a narrower width section and two peaks apart in a wider section of the developing rings 14.

In this embodiment, the cutting stent 1 is provided with end support rings 12 at the proximal and distal ends of the main body segment 11, respectively. In a modified embodiment, the main body segment 11 is provided with an end support loop 12 at the distal end, and the proximal end of the main body segment 11 serves as the proximal end of the cutting stent 1.

The cutting support 1 of the present embodiment is used in specific application scenarios: during expansion and contraction of the cutting stent 1, the body segment 11 is formed by a wire wound helically extending between the proximal and distal ends, increasing the flexibility and compliance of the body segment 11. Meanwhile, the end supporting rods 121 which are connected at an angle form a plurality of large wave troughs, and the large wave troughs 1221 are closer to the main body section 11 in the axial direction than the adjacent end wave troughs 122, so that gaps between the end supporting ring 12 and the main body supporting ring 111 are increased, flexibility and flexibility between the end supporting ring 12 and the main body supporting ring 111 are improved, in conclusion, the flexibility and flexibility between the main body section 11 and the main body section 11 as well as between the main body section 11 and the end supporting ring 12 are improved, smaller bending radius is easier to realize so as to adapt to larger bending angles of blood vessels, and meanwhile, the adaptability of the cutting support 1 and main body supports with different model sizes is also improved.

Through the corresponding structure setting to main part lock ring 111, end support ring 12 and main part section 11 and end support ring 12 hookup location department, not only guarantee the holistic homogeneity of cutting support 1 and to the good supporting effect of vascular wall, still improved the fatigue resistance of cutting support 1, can reduce stress concentration regional deformation or even cracked probability, avoid causing because of cutting the support breaks and impale the emergence of situations such as blood vessel even to the damage of vascular wall.

Second embodiment

Referring to fig. 3, a structural diagram of a cutting stent in a second embodiment and in a contracted state is provided. The difference from the first embodiment is that the present embodiment can adjust the length of the end supporting rod 221 forming the small wave valley 2222 based on the first embodiment so that the length of the end supporting rod 221 forming the small wave valley 2222 is 1-1.8 times the length of the rod body of the main body supporting rod 2111 in the main body supporting ring 211, and since the longer the length of the end supporting rod 221 is when the rod width is the same, the easier the waveform of the corresponding portion of the end supporting ring 22 is deformed after expansion, the end supporting ring 22 can be relatively uniform after expansion by adjusting the length of the rod body of the end supporting rod 221 forming the small wave valley 2222. In this embodiment, the main body support rods 2111 of the main body support ring 211 are equal in length.

Third embodiment

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of a third embodiment of a cutting stent in a contracted state according to the present invention; FIG. 5 is a schematic view of a cutting stent according to the present invention after expansion in a third embodiment. The difference from the foregoing embodiment is that, in the present embodiment:

the transition rod 3212 is shorter, and has a length shorter than the length of the end supporting rod 321 located at the position of the largest large trough 3221, which is approximately half of the longest end supporting rod 321 or approximately equal to the length of the first rod 3213 and the second rod 3112, and the first transition point 32121 and the second transition point are located at the same position at the end of the transition rod 3212 close to the main body 31.

The first transition point 32121 and the second transition point are located at the same position, so that the transition rod 3212 applies stress to the first rod 3213 and the second rod 3112 at the same position in the same direction, the stress on the transition rod 3212 and the stress on the first rod 3213 and the stress on the second rod 3112 are more uniform, the fatigue resistance is enhanced, the waveform formed after expansion is relatively uniform, and the cutting stent 3 is not easily deformed and broken.

Specifically, the first transition point 32121 is located between the two ends of the end support ring 32 in the axial direction, i.e., between the proximal-most end and the distal-most end of the end support ring 32. Specifically, taking the end support ring 32 in fig. 4 as an example, in the axial direction, the most proximal end of the end support ring 32 is the position of the flush end wave crest thereof, and the most distal end of the end support ring 32 is the position of the end wave trough formed by the longest end support rod 321 in the end support ring 32. The first transition point 32121 (i.e., the end of the transition rod 3212 on the side close to the main body segment 31) is located between two ends of the end support ring 32 in the axial direction, and the length of the transition rod 3212 is smaller than the longest end support rod 321 in the end support ring 32, which is beneficial to reduce the length difference between the first rod 3213 and the second rod 3112, so that the waveforms of the main body segment 31 and the end support ring 32 are more uniform.

The first rod 3213 and the second rod 3112 extend towards different directions in the proximal direction and the distal direction respectively, that is, the first rod 3213 extends towards the proximal direction, and the second rod 3112 extends towards the distal direction (extends spirally towards the distal end), which is beneficial to the uniformity of the waveform of the cutting stent 1.

In a specific application example, the first transition point 32121 and the second transition point are located at the same position, in which case, the first transition point 32121 is located at an end position of the transition rod 3212 on a side away from the main body segment 31, or the first transition point 32121 and the second transition point are located between two ends of the transition rod 3212, that is, the first transition point 32121 and the second transition point are not located at end positions of the transition rod 121.

Fourth embodiment

Referring to fig. 6, a structural diagram of a cutting stent in a fourth embodiment and in a contracted state is provided. The difference from the foregoing embodiment is that, in the present embodiment:

from the first end to the second end, the two segments are divided, and the width of the end support bar 421 in each segment is consistent. Here, the width of the end support bar 421 is smaller in a section near the first end, and the width of the end support bar 421 is larger in a section near the second end.

In the present embodiment, the width of the wider end support bar 421 is 1 to 2 times the width of the narrower end support bar 421, but in a preferred specific application example of the present embodiment, the wider section occupies 10 to 80% of the entire end support ring 42, or a smaller range, such as 20 to 60%, 20 to 50%, and the smaller the proportion of the wider section, the smaller the radial support force of the end support ring 42, the more beneficial the protection of the branch vessel is, and the damage to the vessel wall due to the excessive radial support force of the cutting stent 4 is avoided.

Fifth embodiment

Referring to fig. 7, a schematic structural view of a cutting stent in a fifth embodiment and in a contracted state is provided. The difference from the foregoing embodiment is that, in the present embodiment: the width of the end portion peak and the end portion valley formed by the at least one end portion supporting bar 521 is larger than the width of the other portions of the at least one end portion supporting bar 521. That is, the width of the rod body of at least one end supporting rod 521 at the wave crest or the wave trough is larger than the width of other parts, and this arrangement can improve the radial supporting force, improve the metal coverage rate and enhance the fatigue resistance. Preferably, the width of the end wave crest and the end wave trough formed by the end supporting rod 521 is 1.1 to 1.6 times of the width of the rod body at other positions.

In other embodiments, at least one end brace 521 may define end peaks or end valleys that have a greater width than other portions of the at least one end brace 521.

In addition, the length of end support bar 521, which forms a large valley 5221, increases gradually from the first end to the second end of end support bar 521, and the length of end support bar 521, which forms a small valley 5222, increases gradually. At the same time, the width of the end support bar 521 is also gradually increased.

Sixth embodiment

Referring to fig. 8, a structural diagram of a sixth embodiment of the cutting stent in a contracted state is shown. The difference from the foregoing embodiment is that, in the present embodiment:

the compliance of the cutting stent 6 is enhanced by adjusting the number of connecting rods 63 in the body section 61. As in the first embodiment, 4 main body peaks are provided at intervals between two adjacent connecting rods 13 in the main body segment 11, whereas the number of peaks at intervals between two adjacent connecting rods 63 in the main body segment 61 becomes 6 in the present embodiment.

At the same time, the position of the connecting rods 63 between the end support rings 62 and the main body segments 61 is also adjusted correspondingly, so that the connecting rods 63 are uniformly distributed in the cutting support 6 to ensure the support flexibility and the stress uniformity. In the modified embodiment, in the main body section 61, the number of peaks spaced between the adjacent connecting rods 63 is flexibly set as required, and the radial supporting force of the main body section 61 is stronger as the number of the connecting rods 63 is larger, whereas the radial supporting force is stronger as the number of the connecting rods 63 is smaller and thinner, and the flexibility of the main body section 61 is better.

It is to be understood that structures and reference numerals that are not mentioned in each embodiment may be referred to and applied to structures in other embodiments, and corresponding combination or separation of partial structures may be performed according to different setting requirements.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A cutting stent, comprising:

a main body section including a plurality of main body support loops formed by a wire wound to extend helically between the two ends of the cutting support; and

2. The cutting stent of claim 1, wherein the end support rings comprise high and low wave windings and transition rods connected between the end support rods at both ends of the high and low wave windings in the circumferential direction, the high and low wave windings comprise a plurality of the end valleys, the end valleys comprise small valleys and large valleys alternately arranged, and the large valleys are axially closer to the main body section than adjacent small valleys.

3. The cutting stent according to claim 2, wherein the two ends of the high-low wave winding in the circumferential direction are a first end and a second end, respectively, and the length of the end supporting rod at the first end is shorter than that of the end supporting rod at the second end.

4. The cutting stent of claim 3, wherein, from the first end to the second end,

5. The cutting stent of claim 4, wherein the width of the end support bar increases from the first end to the second end.

6. The cutting stent of claim 1, wherein adjacent end support bars are interconnected on a side away from the main body segment to form a plurality of end peaks, the plurality of end peaks being flush.

7. The cutting support of claim 3, wherein the end support bar at the first end is a first bar, the transition bar is further connected to the winding, the main support ring comprises sequentially angled main support bars, the main support bar connected to the transition bar is a second bar,

8. The cutting stent of claim 7, wherein the first rod is connected at a first transition point of the transition rod and the second rod is connected at a second transition point of the transition rod.

9. The cutting stent according to claim 8, wherein the first transition point is located at an end position of the transition bar on a side away from the main body segment, and the second transition point is located at a middle position of the transition bar.

10. The cutting stent of claim 8, wherein the first transition point is co-located with the second transition point.

11. The cutting stent of claim 10, wherein the first transition point is located at an end of the transition rod, the first transition point being located between ends of the end support ring in the axial direction.

12. The cutting stent of claim 10, wherein the first rod and the second rod extend in different ones of a proximal direction and a distal direction, respectively.

13. The cutting stent of claim 1, wherein adjacent end struts are interconnected on a side away from the main body segment to form end peaks, and at least one end strut defines end peaks and/or end valleys having a width greater than other portions of the at least one end strut.

14. The cutting stent according to any one of claims 1 to 13, wherein the cutting stent is provided with the end support rings at proximal and distal ends of the body segment, respectively.

15. The cutting support according to any one of claims 1 to 13, wherein a connecting rod is provided between adjacent body support rings, between adjacent body support rings and end support rings.

16. The cutting stent according to any one of claims 1 to 13, wherein a coating is further provided on the cutting stent.

17. A cutting support according to any one of claims 1 to 13, wherein a plurality of developer rings are provided spaced apart on a side of the end support ring remote from the body segment.