CN108670511A - A kind of flexible short holder of screw type - Google Patents

Abstract

The invention discloses a kind of flexible short holders of screw type, by rack body area, development positioning area composition.First waveform object coiling, the second wave coiling, third wave coiling, the 4th wave coiling, the 4th wave coiling and the 4th wave coiling are connected by various connecting bridge forms rack body area.Development positioning area is made of developing ring and positioning bridge.The flexible short holder of the screw type has the expansion state of the compressive state and swell diameter of collapsed diameter.Structure of the invention is uniform, and development effect is excellent, accurate positioning, and radial strength is high, and compliance is good and occupation mode is innovated and using persistently effective.

Description

A spiral flexible short stent

technical field

The invention relates to the technical field of implantable prosthesis medical devices, in particular to a helical flexible short stent.

Background technique

Human lumen stenosis, blockage and restenosis, luminal neoplasia, etc. are common and dangerous lesions; clinically, such lesions can occur in any physiological lumen, including cardiovascular and cerebrovascular, endocrine, genitourinary, digestive and respiratory systems In the cavity. In view of the short curative effect of balloon dilatation, luminal stenting is an important and even the main treatment for this kind of lesion.

In view of the difference in release and expansion methods, endoluminal stents can be divided into self-expandable stents and balloon-expandable stents. Considering that after release, it is prone to collapse in a complex physiological environment, generally the broad-spherical stent is only used in coronary arteries where the biomechanical environment is relatively mild. The self-expanding stent that is easy to use and has excellent radial support is widely used, and is also the focus of this patent.

At present, self-expanding stents are generally made by laser cutting and post-processing of shape memory metal tubes. These stents are usually well radially supported, precisely positioned for delivery, and inexpensive to compress and expand. Although self-expanding stents have mature research and development and a long history of clinical use, there are still many defects in their structure and performance.

The invention provides a structural design for the bracket, which has good flexibility, sufficient radial strength and axial strength; clear development, accurate positioning; convenient pressing and holding, multiple short brackets can be used at the same time to replace Long brace for further flexibility. In addition, this type of stent can also provide drug-loading ability, making the operation more precise and convenient.

Contents of the invention

The present invention aims to provide a device with clear development, precise positioning, cheap grip and release, good flexibility and high radial strength, and multiple short supports can replace one long support when used at the same time.

The object of the present invention is achieved through the following technical solutions: a helical flexible short stent, comprising a stent body area and a developing positioning area.

The stent body area is composed of the fifth wave winding and the sixth wave winding at the end, the first wave winding between the two ends, and the first wave winding and the end The connection is made through a transition zone comprising a second undulation, a third undulation, and a fourth undulation. Wherein, the fifth wave-shaped winding is connected to the first wave-shaped winding through the second wave-shaped winding, and the sixth wave-shaped winding is connected to the first wave-shaped winding through the fourth wave-shaped winding and the third wave-shaped winding in sequence. Wired connection. A coherent whole is formed between the windings of the corrugated objects.

The development positioning area is composed of a development ring and a positioning bridge; the development ring contains a development point for welding the development metal.

The winding of the first undulating object is sequentially connected by a plurality of first undulating objects to form a helical structure. The first undulating object is composed of two first arc units and two first ribs; one of the first arc units constitutes the first The crests of the undulations and the other form the troughs of the first undulations; all the first undulations in the winding of the first undulations are arranged in a crest-to-valley manner along the axial direction of the helical structure; the length of the first ribs remains the same;

The fifth undulating object winding is sequentially connected by a plurality of fifth undulating objects, the sixth undulating object winding is sequentially connected by a plurality of sixth undulating objects, the fifth undulating object winding and the sixth undulating object are connected to form a ring structure, Each fifth undulation is made up of two fifth ribs and two fifth arc units, wherein one fifth arc unit forms the crest of the fifth undulation, and the other forms the trough of the fifth undulation; the fifth The length of the ribs remains the same; each sixth rib is composed of two sixth ribs and two sixth arc units, one of the sixth arc units constitutes the crest of the sixth wave, and the other sixth The trough; the length of the sixth rib remains the same.

The transition zone is a right-angled trapezoidal area, and the second undulating object winding is located on the upper part of the right-angled trapezoidal area; the second undulating object winding is formed by sequentially connecting a plurality of second undulating objects, and each second undulating object is composed of two second undulating objects Composed of two ribs and two second arc units, one of the second arc units constitutes the crest of the second corrugated object, and the other constitutes the trough of the second corrugated object; the lengths of the second ribs are multiples from top to bottom increment;

The third wave-shaped object winding and the fourth wave-shaped object winding are located at the lower part of the trapezoidal area, the third wave-shaped object winding is formed by connecting a plurality of third wave objects in sequence, and the third wave object is composed of two third ribs and Two third arc units are connected; the fourth corrugated object winding is formed by connecting multiple fourth corrugated objects in sequence, and the fourth corrugated object is formed by connecting two fourth ribs and two fourth arc units. , and the third rib and the fourth rib increase in multiples from top to bottom;

The beginning end of the fourth wave winding is connected to the tail end of the second wave winding, and the beginning end of the third wave winding is connected to the bottom second rib of the second wave winding through the B-type third connecting bridge strip connected;

The second wave object winding, the third wave object winding, and the fourth wave object winding together form a ring structure, wherein, the beginning end of the second wave object winding is connected to the end of the fourth wave object winding, and the third wave object winding The end of the object winding is connected to the end of the first wave object winding.

There are several first connecting bridges between each adjacent helical period of the first wave winding; the two ends of the first connecting bridge are connected to the first arc units located on different helical periods;

There are a plurality of second connecting bridges between the first wave winding and the second wave winding; the second connecting bridges connect the first arc unit and the second arc unit. And one of the second connecting bridges is connected to the second arc unit at the bottom of the second wave winding;

There is an A-shaped third connecting bridge between the first wave winding and the third wave winding, and the A-shaped third connecting bridge connects the first arc unit and the third arc unit.

There is a fourth connecting bridge between the third wave-shaped object winding and the fourth wave-shaped object winding, and the fourth connecting bridge connects the third arc unit and the fourth arc unit.

The second undulation and the fifth undulation are connected by a plurality of fifth connecting bridges arranged in the axial direction, and the specific connection position is between two opposite second arc units and the fifth arc unit.

The fourth undulation and the sixth undulation are connected by a plurality of sixth connecting bridges arranged in the axial direction, and the specific connection position is between two opposite fourth arc units and sixth arc units.

Further, the first wave winding includes 3-4 helical periods. Each helical period of the first undulation winding contains 16 first undulations; the second undulation winding contains 9 second undulations; the third undulation winding contains 6 third undulations; the fourth undulation The object winding includes 7 fourth undulations; the fifth undulation winding includes 8 fifth undulations; the sixth undulation winding includes 8 sixth undulations.

Further, the first wave object winding helix angle is 70 degrees; the second wave object winding helix angle is 78°-82°; the third wave object winding helix angle is 70°-75°; the fourth wave object winding The wire helix angle is 75°-85°.

Further, the B-type third connecting bridge is connected to the second rib of the second wave winding at 32%-40% of the length, and is biased to the first wave side.

Further, the inclination directions of the first connecting bridge, the second connecting bridge, the third connecting bridge and the fourth connecting bridge are the same. The inclination angle range of the first connection bridge and the A-type third connection bridge: 68°-72°; the inclination angle of the B-type third connection bridge is 66°-70°; The inclination angle of the second connecting bridge of the arc unit is 68°-72°, the inclination angle of the remaining second connecting bridges is 55°-72°; the inclination angle of the fourth connecting bridge is 32°-35°.

Further, there are 3-4 first circular arc units not connected to the first connecting bridge on both sides of any first circular arc unit connected to the first connecting bridge; any second circular arc unit connected to the second connecting bridge There are 3-4 second circular arc units not connected to the second connecting bridge on both sides of the arc unit; any third circular arc unit connected to the A-type third connecting bridge has 3-4 unconnected arbitrary connecting bridges on both sides The third arc unit of . There are 3-4 arc units not connected to any connecting bridge on both sides of any arc unit connected with the fourth connecting bridge.

Further, the length of the first ribs remains consistent; the length of the second ribs increases from top to bottom in a geometric sequence with a common ratio of 1-1.1; the length of the third ribs in a common ratio of 1-1.15 from top to bottom The geometric sequence increases; the length of the fourth rib increases from top to bottom in a geometric sequence with a common ratio of 1-1.2; the fifth rib and the sixth rib keep the same length. And the lengths of the fifth rib and the sixth rib are not equal. The length of any second rib is longer than that of the first rib, the third rib and the fourth rib; the width of the second rib is wider than that of other ribs.

Further, the length of the first connecting bridge is the same; the length of the fifth connecting bridge increases from top to bottom in a geometric sequence with a common ratio of 1-1.2; the length of the sixth connecting bridge is in a common ratio of 1-1.1 from top to bottom. Incremental than the sequence. And the length of the shortest fifth connecting bridge is greater than 1/4 of the length of the fifth rib.

Further, the vertical span between the two connection ends of the first connection bridge is separated by a first connection arc. Similarly, the vertical spans between the two connecting ends of the second connecting bridge, the third connecting bridge and the fourth connecting bridge are separated by a connecting arc.

Further, the length of the positioning bridge is 0.5-1 times the length of the sixth rib. The maximum cross-sectional width of the developing point is 6-7 times of the width of the sixth rib.

Technical advantage of the present invention is:

1. The development area of the stent is larger than that of the ordinary stent, with clear development and precise positioning;

2. The structure of the bracket is uniform, the length is short, and the pressure and release are cheap;

3. The central open-loop design of the bracket body, the crests of the wave objects are arranged against the troughs, with good bendability and strong flexibility;

4. The closed-loop design at both ends of the bracket body, the wave peaks are arranged on the wave peaks, and the positioning is good;

5. There are two types of ribs at the far end of the stent body, with inconsistent lengths, which facilitates the positioning of the stent;

6. The bracket is shorter than ordinary brackets, and multiple series are used to reduce the contact area between metal and human body, minimize the fracture caused by bracket bending, and use better.

Description of drawings

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

Fig. 2 is the partial structure schematic diagram of the embodiment of the present invention;

Fig. 3 is a schematic diagram of the expanded body region of the stent;

Fig. 4 is the schematic diagram of corrugated object;

Fig. 5 is a schematic diagram after the development positioning area is expanded;

In the figure, 1-stent body area, 11-the first corrugated object winding, 111-the first corrugated object, 111a-the first rib, 111b-the first arc unit, 12-the second corrugated object winding, 121 - second wave, 121a - second rib, 121b - second arc unit, 13 - third wave winding, 131 - third wave, 131a - third rib, 131b - third arc Unit, 14-the fourth wave winding, 141-the fourth wave, 141a-the fourth rib, 141b-the fourth arc unit, 15-the fifth wave winding, 151-the fifth wave, 151a – the fifth rib, 151b- the fifth arc unit, 16- the sixth wave winding, 161- the sixth wave, 161a- the sixth rib, 161b- the sixth arc unit; 01- the first connection Bridge, 02a-type A second connection bridge, 02b-B type second connection bridge, 03a-A type third connection bridge, 03b-B type third connection bridge, 04-fourth connection bridge, 05-fifth connection bridge Bridge, 06-sixth connecting bridge; 2-developing positioning area, 21-developing ring, 211-developing point, 22-locating bridge.

Detailed ways

The invention discloses an innovative helical flexible short stent, which can self-expand and expand from the first outer diameter when compressed to the second outer diameter matching the lesion cavity, and can be used to expand any blocked or narrowed pipeline to treat lumen stenosis , restenosis, luminal neoplasia or wall dissection and other diseases.

As shown in Figure 1, a helical flexible short stent consists of a stent body area 1 and a development positioning area 2;

As shown in FIG. 2 , the stent body region 1 is composed of a fifth wave winding 15 and a sixth wave winding 16 located at the ends, a first wave winding 11 located between the two ends, and a sixth wave winding 11 located between the two ends. A wave-shaped winding 11 is connected to the end through a transition area, and the transition area includes a second wave-shaped winding 12 , a third wave-shaped winding 13 , and a fourth wave-shaped winding 14 . Among them, the fifth wave winding 15 is connected to the first wave winding 11 through the second wave winding 12, and the sixth wave winding 16 is sequentially passed through the fourth wave winding 14 and the third wave winding. 13 is connected to the first wave winding 11. A coherent whole is formed between the windings of the corrugated objects.

The developing positioning area 2 is composed of a developing ring 21 and a positioning bridge 22; the developing ring 21 contains a developing point 211 where the developing metal is welded.

The first corrugated object winding 11 is sequentially connected by a plurality of first corrugated objects 111 to form a helical structure, and the first undulated object 111 is composed of two first circular arc units 111b and two first ribs 111a; The arc unit 111b constitutes the crest of the first wave object 111, and the other constitutes the valley of the first wave object 111; all the first wave objects 111 in the first wave object winding 11 present a peak-to-valley manner along the axial direction of the helical structure Arrangement; after the stent is released and expanded, the peaks of the previous circle just fall into the troughs of the next circle, which improves the flexibility and compliance of the central main body area to the greatest extent. The length of the first rib 111a is consistent;

The fifth undulating wire 15 is sequentially connected by a plurality of fifth undulating wires 151, the sixth undulating wire 16 is sequentially connected by a plurality of sixth undulating wires 161, the fifth undulating wire 15 and the sixth undulating wire 16 are connected to form a ring structure, and each fifth rib 151 is composed of two fifth ribs 151a and two fifth arc units 151b, wherein one fifth arc unit 151b constitutes the crest of the fifth rib 151, and the other A trough that constitutes the fifth wave 151; the length of the fifth rib 151a is consistent; each sixth wave 161 is composed of two sixth ribs 161a and two sixth arc units 161b, one of the sixth circles The arc unit 161b constitutes the crest of the sixth wave 161 and the valley of the other sixth wave 161; the length of the sixth rib 161a is consistent.

The transition zone is a right-angled trapezoidal area, and the second wave-shaped object winding 12 is located on the upper part of the right-angled trapezoidal area; the second wave-shaped object winding 12 is formed by sequentially connecting a plurality of second wave-shaped objects 121, and each second wave-shaped object 121 It consists of two second ribs 121a and two second arc units 121b, wherein one second arc unit 121b constitutes the crest of the second corrugated object 121, and the other constitutes the trough of the second corrugated object 121; the second rib The lengths of the bars 121a increase in multiples from top to bottom;

The third undulating wire 13 and the fourth undulating wire 14 are located at the lower part of the trapezoidal area, the third undulating wire 13 is formed by connecting successively a plurality of third undulating objects 131, and the third undulating object 131 is composed of two The third rib 131a is connected with two third arc units 131b; the fourth corrugated winding 14 is formed by sequentially connecting a plurality of fourth corrugated objects 141, and the fourth corrugated object 141 is composed of two fourth ribs 141a and two fourth arc units 141b are connected, and the third rib 312 and the fourth rib 322 respectively increase in multiples from top to bottom;

The beginning end of the fourth wave winding 14 is connected to the tail end of the second wave winding 12, and the beginning end of the third wave winding 13 is connected to the end of the second wave winding 12 through the B-type third connecting bridge 03b. The second ribs 121a below are connected;

The second wave winding 12, the third wave winding 13, and the fourth wave winding 14 together form a ring structure, wherein the beginning of the second wave winding 12 and the end of the fourth wave winding 14 The end of the third wave winding 13 is connected to the end of the first wave winding 11 . This transition facilitates even force transfer and distribution for crimping and releasing of the stent.

There are several first connecting bridges 01 between each adjacent helical period of the first wave winding 11; the two ends of the first connecting bridge 01 are connected to the first arc units 111b located on different helical periods;

There are a plurality of second connecting bridges 02 between the first wave winding 11 and the second wave winding 12; the second connecting bridges 02 connect the first arc unit 111b and the second arc unit 121b. And one of the second connecting bridges 02 is connected to the second arc unit 121b at the bottom of the second wave winding 12;

There is an A-shaped third connecting bridge 03 a between the first wave winding 11 and the third wave winding 13 , and the A-shaped third connecting bridge 03 a connects the first arc unit 111 b and the third arc unit 131 b.

There is a fourth connecting bridge 04 between the third wave winding 13 and the fourth wave winding 14, and the fourth connecting bridge 04 connects the third arc unit 131b and the fourth arc unit 141b.

The second undulations 121 and the fifth undulations 151 are connected by a plurality of fifth connecting bridges 05 arranged in the axial direction, and the specific connection position is between two opposite second arc units 121b and fifth arc units 151b. That is, between the second undulation 121 and the fifth undulation 151, and between the fourth undulation 141 and the sixth undulation 161, there is a crest-to-crest arrangement; the design of the crest-to-crest makes the two ends of the stent body region have a good Radial support force while ensuring excellent force transmission capability.

The fourth undulation 141 and the sixth undulation 161 are connected by a plurality of sixth connecting bridges 06 arranged in the axial direction, and the specific connection position is between two opposite fourth arc units 141b and sixth arc units 161b.

The first wave winding 11 includes 3-4 helical periods. Each spiral period of the first undulation winding 11 includes 16 first undulations 111; the second undulation winding 12 includes 9 second undulations 121; the third undulation winding 13 includes 6 third undulations 131; the fourth undulation 14 includes 7 fourth undulations 141; the fifth undulation 15 includes 8 fifth undulations 151; the sixth undulation 16 includes 8 sixth undulations 161 . So the stent is shorter than normal stents to a certain extent.

The helix angle of the first corrugated object winding 11 is 70 degrees, which can give it good flexibility and sufficient axial and radial support; the second corrugated object winding 12 has a helix angle of 78°-82°; the third waveform The helix angle of the object winding 13 is 70°-75°; the helix angle of the fourth wave object winding 14 is 75°-85°, so that it has a gentle and uniform gap between the two ends and the first wave object winding 11 in the center. The transition is convenient for the transmission of force and potential energy, and it is convenient for the support to be gripped and released.

The B-type third connecting bridge 03b is connected to 32%-40% of the length of the second rib 105a of the second wave winding 12, and is biased to the first wave 111 side.

The first connecting bridge 01, the second connecting bridge 02, the third connecting bridge 03, and the fourth connecting bridge 04 have the same inclination direction. The first connection bridge 01, the inclination angle range of the third connection bridge 03a of type A: 68°-72°; the inclination angle of the third connection bridge 03b of type B is 66°-70°; The inclination angle range of the second connection bridge 02 of the second arc unit 121b below is 68°-72°, and the inclination angle of the remaining second connection bridges 02a is 55°-72°; the inclination angle of the fourth connection bridge 04 is 32° -35°. Arranging at this angle can facilitate the elimination of residual stress during thermoplastic shaping of the bracket to the greatest extent, and also improve the flexibility of the bracket to the greatest extent.

There are 3-4 first arc units 111b not connected to the first connecting bridge 01 on both sides of any first arc unit 111b connected to the first connecting bridge 01. This proportional distribution ensures excellent Compliant and, to a certain extent, ample axial support. There are 3-4 second arc units 121b not connected to the second connecting bridge 02 on both sides of any second arc unit 121b connected to the second connecting bridge 02; any one connected to the third connecting bridge 03a of type A There are 3-4 third arc units 131b on both sides of the third arc unit 131b that are not connected to any connecting bridge. There are 3-4 arc units not connected with any connecting bridge on both sides of any arc unit connected with the fourth connecting bridge 04, to match the central area and the two ends.

The length of the first rib 111a is consistent to make the area even and flat; the length of the second rib 121a increases from top to bottom in a geometric sequence with a common ratio of 1-1.1; the length of the third rib 131a is in a common ratio from top to bottom The geometric sequence of 1-1.15 increases; the length of the fourth rib 141a increases from top to bottom in a geometric sequence with a common ratio of 1-1.2, so that the regional hoop force is uniform, and the distribution is gradually stronger and weaker in proportion. The regularity and stability of the bracket are ensured; the lengths of the fifth rib 151a and the sixth rib 161a are consistent. Moreover, the lengths of the fifth rib 151a and the sixth rib 161a are not equal, which is convenient for positioning when the stent is released, and is not easy to slide down in the lumen after the release. The length of any second rib 121a is longer than that of the first rib 111a, the third rib 131a and the fourth rib 141a; the width of the second rib 121a is wider than that of other ribs.

The length of the first connecting bridge 01 is the same; the length of the fifth connecting bridge 05 increases from top to bottom in a geometric sequence with a common ratio of 1-1.2; the length of the sixth connecting bridge 06 in a common ratio of 1-1.1 from top to bottom is equal Incremental than the sequence. And the length of the shortest fifth connecting bridge 05 is greater than 1/4 of the length of the fifth rib 151a.

The vertical span between the two connection ends of the first connection bridge 01 is separated by a first connection arc 111b. Similarly, the vertical span between the two connection ends of the second connection bridge 02 , the third connection bridge 03 and the fourth connection bridge 04 is separated by a connection arc.

One end of the positioning bridge 06 is connected to the developing ring 21, and the other end is connected to the sixth rib 161a; the length of the positioning bridge 06 is 0.5-1 times the length of the sixth rib 161a, which ensures the stability of the release force of the bracket. The maximum cross-sectional width of the developing point 211 is 6-7 times of the width of the sixth rib 161a, so the area of the developing point is larger than that of a normal bracket, which endows the bracket with good development and precise positioning.

As common knowledge in the field, the material of the developing metal welded to the developing point 211 includes but not limited to gold metal and tantalum metal.

This type of stent body has a relatively short first corrugated winding 11 area, forming a short stent body; multiple short stents replace long stents in the lesion cavity and are used in series, so the compliance of the cavity after the stent is implanted is greatly improved It also reduces the metal contact area, which can reduce the ISR (in-stent restenosis) phenomenon caused by the stent, and also reduce the risk of stent fracture caused by the stent being too long.

Claims (10)

1. A short helical flexible stent, characterized in that it comprises a stent body area (1) and a developing positioning area (2). The stent body area (1) is composed of the fifth undulating wire (15) and the sixth undulating wire (16) located at the ends, and the first undulating wire (11) located between the two ends. , the connection between the first corrugated object winding (11) and the end is realized through a transition zone, and the transition region includes a second corrugated object winding (12), a third corrugated object winding (13), a fourth corrugated object Winding (14). Wherein, the fifth wave-shaped winding (15) is connected to the first wave-shaped winding (11) through the second wave-shaped winding (12), and the sixth wave-shaped winding (16) is sequentially passed through the fourth wave-shaped winding (14) and the third wave winding (13) are connected to the first wave winding (11). A coherent whole is formed between the windings of the corrugated objects. The developing positioning area (2) is composed of a developing ring (21) and a positioning bridge (22); the developing ring (21) contains a developing point (211) for welding the developing metal. The first undulating winding (11) is sequentially connected by a plurality of first undulating objects (111) to form a helical structure, and the first undulating object (111) consists of two first arc units (111b) and two first ribs (111a) composition; wherein one first arc unit (111b) constitutes the crest of the first wave object (111), and the other constitutes the wave trough of the first wave object (111); the first wave object winding (11) All the first wave objects (111) in the helical structure are arranged in a crest-to-trough manner along the axial direction of the helical structure; the length of the first ribs (111a) is kept the same; The fifth undulating object winding (15) is sequentially connected by a plurality of fifth undulating objects (151), the sixth undulating object winding (16) is sequentially connected by a plurality of sixth undulating objects (161), and the fifth undulating object winding (15) and the sixth corrugated object winding (16) are connected to form a ring structure, and each fifth corrugated object (151) is composed of two fifth ribs (151a) and two fifth arc units (151b), One of the fifth circular arc units (151b) forms the crest of the fifth wave (151), and the other constitutes the valley of the fifth wave (151); the fifth rib (151a) has the same length; each sixth wave Object (161) is made up of two sixth ribs (161a) and two sixth arc units (161b), wherein one sixth arc unit (161b) constitutes the crest of the sixth wave object (161), and the other The trough of the sixth wave object (161); the length of the sixth rib (161a) remains consistent. The transition zone is a right-angled trapezoidal area, and the second undulating object winding (12) is located on the upper part of the right-angled trapezoidal area; the second undulating object winding (12) is formed by sequentially connecting a plurality of second undulating objects (121), each A second wave object (121) is made up of two second ribs (121a) and two second arc units (121b), wherein one second arc unit (121b) constitutes the second wave object (121) Crest, another wave trough that constitutes the second corrugated object (121); the length of the second rib (121a) increases in multiples from top to bottom; The third undulating wire (13) and the fourth undulating wire (14) are located in the lower part of the trapezoidal area, and the third undulating wire (13) is formed by successively connecting a plurality of third undulating objects (131), The third wave object (131) is formed by connecting two third ribs (131a) and two third arc units (131b); the fourth wave object winding (14) is formed by a plurality of fourth wave objects (141 ) are connected in turn, the fourth corrugated object (141) is formed by connecting two fourth ribs (141a) and two fourth arc units (141b), and the third rib (312), the first The four ribs (322) are respectively multiplied from top to bottom; The starting end of the fourth wave winding (14) is connected to the tail end of the second wave winding (12), and the starting end of the third wave winding (13) is connected to the third connecting bridge (03b) of type B. The second rib (121a) at the bottom of the second corrugated object winding (12) is connected; The second wave-shaped object winding (12), the third wave-shaped object winding (13), and the fourth wave-shaped object winding (14) together form a ring structure, wherein the starting end of the second wave-shaped object winding (12) is connected to the first The ends of the four wave-shaped object windings (14) are connected, and the ends of the third wave-shaped object winding (13) are connected with the ends of the first wave-shaped object winding (11). There are several first connecting bridges (01) between each adjacent helical period of the first wave winding (11); the two ends of the first connecting bridges (01) are connected to the first arc units located on different helical periods (111b); There are a plurality of second connecting bridges (02) between the first corrugated object winding (11) and the second corrugated object winding (12); the second connecting bridge (02) connects the first arc unit (111b) and the second arc unit (111b) Two arc units (121b). And one of the second connecting bridges (02) is connected to the second arc unit (121b) at the bottom of the second wave winding (12); There is an A-type third connecting bridge (03a) between the first wave-shaped object winding (11) and the third wave-shaped object winding (13), and the A-type third connecting bridge (03a) connects the first arc unit (111b) With the third arc unit (131b). There is a fourth connecting bridge (04) between the third wave object winding (13) and the fourth wave object winding (14), and the fourth connection bridge (04) connects the third arc unit (131b) and the fourth circle Arc unit (141b). The second undulation (121) and the fifth undulation (151) are connected by a plurality of fifth connecting bridges (05) arranged in the axial direction, and the specific connection positions are two opposite second arc units (121b) and the fifth Between the five arc units (151b). The fourth undulation (141) and the sixth undulation (161) are connected by a plurality of sixth connecting bridges (06) arranged in the axial direction, and the specific connection positions are two opposite fourth circular arc units (141b) and the sixth Between the six arc units (161b). 2. The helical self-expanding stent according to claim 1, characterized in that, the first wave winding (11) includes 3-4 helical periods. Each helical cycle of the first undulation (11) comprises 16 first undulations (111); the second undulation (12) comprises nine second undulations (121); the third undulation winds The wire (13) contains 6 third undulations (131); the fourth undulation winding (14) contains 7 fourth undulations (141); the fifth undulation winding (15) contains 8 fifth undulations object (151); the sixth wave object winding (16) includes 8 sixth wave objects (161). 3. The spiral self-expanding stent according to claim 1, wherein the helix angle of the first wave winding (11) is 70 degrees; the helix angle of the second wave winding (12) is 78°-82° °; the third wave object winding (13) has a helix angle of 70°-75°; the fourth wave object winding (14) has a helix angle of 75°-85°. 4. The spiral flexible short stent according to claim 1, characterized in that, the second rib (105a) connected to the second corrugated winding (12) of the B-type third connecting bridge (03b) 32%-40% of the length of the first wave object (111) side. 5. The spiral flexible short stent according to claim 1, characterized in that, the first connecting bridge (01), the second connecting bridge (02), the third connecting bridge (03), the fourth connecting bridge (04) The direction of inclination is the same. The first connecting bridge (01), the inclination angle range of the third connecting bridge (03a) of type A: 68°-72°; the inclination angle of the third connecting bridge (03b) of type B is 66°-70°; it is connected to the second The inclination angle range of the second connecting bridge (02) of the second arc unit (121b) at the bottom of the corrugated object winding (12) is 68°-72°, and the inclination angle of the remaining second connecting bridges (02a) is 55° -72°; the fourth connecting bridge (04) has an inclination angle of 32°-35°. 6. The spiral self-expanding stent according to claim 1, characterized in that, there are 3-4 unconnected first arc units (111b) on both sides of any one of the first connecting bridges (01) The first circular arc unit (111b) of a connecting bridge (01); any one connected with the second circular arc unit (121b) of the second connecting bridge (02) has 3-4 second connecting bridges ( 02) of the second arc unit (121b); any one of the third arc unit (131b) connected to the A-type third connecting bridge (03a) has 3-4 third circles not connected to any connecting bridge on both sides Arc unit (131b). There are 3-4 arc units not connected with any connecting bridge on both sides of any arc unit connected with the fourth connecting bridge (04). 7. The spiral self-expanding stent according to claim 1, characterized in that, the length of the first rib (111a) remains consistent; the length of the second rib (121a) is in a common ratio of 1-1.1 from top to bottom. The geometric sequence increases; the length of the third rib (131a) increases from top to bottom as a geometric sequence with a common ratio of 1-1.15; the length of the fourth rib (141a) increases from top to bottom with a common ratio of 1-1.2 The geometric sequence increases; the fifth rib (151a) and the sixth rib (161a) keep the same length. And the lengths of the fifth rib (151a) and the sixth rib (161a) are not equal. The length of any second rib (121a) is longer than the first rib (111a), the third rib (131a) and the fourth rib (141a); the width of the second rib (121a) is wider than other ribs The width of the bar. 8. The spiral self-expanding stent according to claim 1, characterized in that, the first connecting bridge (01) has the same length; the fifth connecting bridge (05) has a common ratio of 1-1.2 from top to bottom. The ratio sequence increases; the length of the sixth connecting bridge (06) increases from top to bottom in a geometric sequence with a common ratio of 1-1.1. And the length of the shortest fifth connecting bridge (05) is greater than 1/4 of the length of the fifth rib (151a). 9. The spiral self-expanding stent according to claim 1, characterized in that, the vertical span between the two connecting ends of the first connecting bridge (01) is separated by a first connecting arc (111b). Similarly, the vertical spans between the two connecting ends of the second connecting bridge (02), the third connecting bridge (03) and the fourth connecting bridge (04) are separated by a connecting arc. 10. The spiral self-expanding stent according to claim 1, characterized in that the length of the positioning bridge (06) is 0.5-1 times the length of the sixth rib (161a). The maximum cross-sectional width of the developing point (211) is 6-7 times the width of the sixth rib (161a).