CN106344209B - A kind of endovascular stent for abdominal aorta and its conveying device and application method - Google Patents
A kind of endovascular stent for abdominal aorta and its conveying device and application method Download PDFInfo
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- CN106344209B CN106344209B CN201610887364.5A CN201610887364A CN106344209B CN 106344209 B CN106344209 B CN 106344209B CN 201610887364 A CN201610887364 A CN 201610887364A CN 106344209 B CN106344209 B CN 106344209B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/07—Stent-grafts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
- A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Transplantation (AREA)
- Cardiology (AREA)
- Veterinary Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Gastroenterology & Hepatology (AREA)
- Pulmonology (AREA)
- Prostheses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
A kind of endovascular stent for abdominal aorta and its conveying device and application method, including main body rack and extending bracket；Main body rack includes metallic framework and overlay film；Metallic framework includes several eyelets, and what main body rack proximal end was equipped with uncoated overlay film can be in W type to the bare bracket of contract, bare bracket node, and there are two level-one wave crest, a second level wave crest and two troughs for tool；Adjacent fist-order wave summit end is equipped with the first fixed ring, and the first fixed ring bottom is equipped with the first hangnail；Secondary wave summit end is equipped with the second fixed ring；A trough top in two troughs is equipped with the second hangnail；Main body rack rear end has the first branch stent and the second branch stent；The top of two extending brackets passes through the distal internal that disconnecting prevention structure is fixedly connected on the first branch stent and the second branch stent respectively.The present invention can be used for the intracavitary therapy of abdominal aneurvsm, can reduce stenter to implant backward shift, the incidence of the adverse events such as interior leakage.
Description
Technical field
The invention belongs to the field of medical instrument technology, in particular to a kind of endovascular stent for abdominal aorta and its conveying device and
Application method.
Background technique
Abdominal aneurvsm is abdominal aorta Ectasia, is caused due to abdominal aorta hardening, damage, infection etc.
Limitation expansion occurs for abdominal aorta, and tumor sample is slowly presented under the impact of high pressure blood flow.Abdominal aorta is expanded by prolonged,
Vascular wall becomes very fragile, very easy to rupture, and abdominal aneurvsm will cause to bleed profusely once rupturing, someone
The title of " bomb " in vivo.With aging of population increase, living standards of the people raising and the continuous improvement of medical level, abdomen is actively
Arteries and veins tumor disease incidence and recall rate have been in rise year by year trend.
Abdominal aneurvsm traditional treatment mode is surgical operation therapy, replaces lesion actively with artificial blood vessel by opening chest and abdomen
Arteries and veins blood vessel carries out reconstructing blood vessel.But since surgical operation therapy risk is big, patient trauma is big, and complication is more, especially for
Merge the patient of the vitals lesions such as the heart, brain, kidney, and mortality is high.Since the 1990s, minimally invasive intervention an actor's rendering of an operatic tune
The emergence and development of interior iatrotechnics, having substituted surgical operation becomes the operation first choice for the treatment of abdominal aneurvsm.Pass through aorta
The transportation system for being mounted with overlay film frame is pushed to diseased region by distal end such as Human Femoral Artery notch, and release overlay film frame is simultaneously
It is fixed, completely cut off diseased aneurysmal, rebuilds transmyocardial passageway to reduce artery knurl pressure and reach therapeutic purposes.
However, there are some problems for the overlay film frame for the treatment of abdominal aneurvsm at present：
One, proximal end close bad easily causes leakage in I type.Interior this peculiar complication of leakage is considered as affecting the treatment, causing
Postoperative knurl continues to increase the main reason for even rupturing.
Two, the tumor neck proximal end arteria renalis is easily caused to block.Especially for tumor neck and the biggish sufferer of aneurysm long axis angle
Structure, existing overlay film frame structure largely only have anti-overlay film frame and are washed away the design for causing to shift downwards by blood flow, do not consider by
When tumor neck and larger aneurysm long axis angle, lesser curvature side moves up and bracket overlay film part is caused to block kidney after overlay film frame implantation
Arterial ostium, the case where causing renal ischemic.
Three, excessive to vascular wall impact force after barbed bare bracket release, vascular wall is caused to damage.The locking of bare bracket proximal end
Before structure release, the overlay film part being connected with bare bracket struts completely, after opening proximal end retaining mechanism, bare bracket band
This fragile vascular wall suddenly " blowing ", is damaged in hangnail proximal end.
Summary of the invention
The object of the present invention is to provide a kind of endovascular stent for abdominal aorta, can be used for the intracavitary of abdominal aneurvsm and control
It treats, can reduce the incidence of the adverse events such as stenter to implant backward shift, interior leakage.
It is a further object of the present invention to provide a kind of conveying devices of endovascular stent for abdominal aorta, and structure is simple, operation
It is convenient, the injury reduced to vascular wall can be discharged by two-stage.
Another object of the present invention is to provide a kind of application method of endovascular stent for abdominal aorta, and operation is simple and reliable,
The Stability and veracity of bracket release can be improved.
To achieve the above object, the present invention takes following technical scheme：
A kind of endovascular stent for abdominal aorta, it includes main body rack and two extending brackets；
The main body rack includes metallic framework and overlay film；The metallic framework includes several eyelets, each elastic metallic
It encloses wavy；It the main body rack proximal end can be to the annular bare bracket of contract, the bare bracket node equipped with uncoated overlay film
In W type, there are two level-one wave crest, a second level wave crest and two troughs for tool；It is fixed that adjacent fist-order wave summit end is equipped with first
Ring, the first fixed ring bottom are equipped with the first hangnail extended towards the main body rack rear end；The secondary wave summit end is equipped with second
Fixed ring；A trough top in two troughs is equipped with the second hangnail extended towards first hangnail；The main body rack rear end
With the first branch stent and the second branch stent；
The top of two extending brackets passes through disconnecting prevention structure respectively and is fixedly connected on first branch stent and the second branch
The distal internal of bracket.
Further, the disconnecting prevention structure is：The distal medial of first branch stent and the second branch stent is all provided with
There are several anticreep barbs, each anticreep barb circumferentially arranges, and tip is towards the bare bracket and extends internally；Each extension branch
The top periphery of frame is equipped with anticreep lantern ring corresponding with the anticreep barb；The anticreep lantern ring section is arc-shaped, also circumferentially arranges；
The anticreep barb is inserted into corresponding anticreep lantern ring；Or
The disconnecting prevention structure is：The distal medial of first branch stent and the second branch stent is equipped with several anticreeps
Lantern ring, each anticreep lantern ring section are arc-shaped, and circumferentially arrange；The top periphery of each extending bracket is equipped with and the Anti-slip cover
The corresponding anticreep barb of ring, tip is backwards to the bare bracket and extends outwardly, and also circumferentially arranges；Anticreep barb insertion corresponds to
Anticreep lantern ring in.
Further, the bare bracket is integrally in broadening formation, and internal diameter is gradually increased from inside to outside, the bare bracket outer wall with
Angle between the main body rack axis is 10-30 degree.
Further, the proximal end of the main body rack and the proximal end of the extending bracket are equipped with the wave crest wave overlapped
Two opposite section small band support rings of paddy, the small band support ring string diameter are 0.1-0.4mm, and head number is 10-20.
Further, the length of first branch stent is greater than the length of second branch stent；Described first point
The metallic framework of branch bracket and the second branch stent is located at the outside of overlay film.
Further, second level crest height of wave 5mm-15mm described in the level-one crest ratio.
Further, the main body rack and extending bracket are equipped with developing mark；
The developing mark of the main body rack is set to the overlay film proximal end of the main body rack, first branch stent and second
The distal end of the intersection of branch stent and first branch stent and the second branch stent；
The developing mark of the extending bracket is set to the overlay film of the extending bracket proximally and distally.
Further, the anticreep lantern ring and anticreep barb quantity are equal, are 3-8；The metal bone of the extending bracket
Frame is integrated helical structure.
A kind of conveying device of the endovascular stent for abdominal aorta, it includes outer tube and in the outer tube
Pipe；Pipe is located at the outer tube lower end in this, has above pipe for accommodating folded endovascular stent for abdominal aorta in this
Accommodating space；Inner tube is equipped in this inside pipe, which is pierced by the outer tube and proximal end is equipped with the first lock collar, and first lock collar is outside
Extend and is equipped with several lock pins；Be equipped with central tube in the inner tube, the central tube proximal end be successively arranged the second lock collar, third lock collar and
Sharp mouth；Second lock collar and third lock collar are polygonal star structure, and each end Xing Jiao is equipped with through-hole；First Fixing shrink ring
Enter in the star angle of the third lock collar, second fixed ring is inserted in the star angle of second lock collar；The lock pin penetrates in each through-hole,
First fixed ring and the second fixed ring are limited in inside corresponding star angle.
A kind of application method of the endovascular stent for abdominal aorta, it utilizes above-mentioned conveying device, the application method packet
Include the following steps：
A. it will be put into the accommodating space after endovascular stent for abdominal aorta compression；
B. the outer tube of the conveying device is implanted into aortic aneurysm to be repaired；
C. the main body rack proximal end overlay film part is discharged, and main body rack position is adjusted according to the developing mark on overlay film
It sets, after determining position, continues to pull down outer tube, discharge the second branch stent completely；
D. it partially drops back first lock collar, the lock pin is made to leave the through-hole of the third lock collar, release first is fixed
Ring；
E. continue first lock collar of dropping back, the lock pin is made to leave the through-hole of second lock collar, release second is fixed
Ring discharges the bare bracket completely；
F. the extending bracket opposite side is implanted into the second branch stent and fixed with the distal end of second branch stent and connected
It connects；
G. continue to pull down outer tube, after discharging the first branch stent completely, ipsilateral another extending bracket of implantation makes to extend branch
Frame is fixedly connected with the first branch stent distal end.
The beneficial effects of the invention are as follows：
One, the small band support ring opposite by the Wave crest and wave trough overlapped, can sufficiently hold round main body rack proximal end
Overlay film part reduces danger of leaking out in I type；
Two, by being set to the wave crest of bare bracket, contrary the first hangnail and the second hangnail at trough, can be to prevent
While only bracket shifts downwards, it can reduce and block arteria renalis blood vessel because tumor neck transition distortion causes bracket lesser curvature side overlay film to move up
The risk of branch；
Three, by relieving mechanism after the classification of bare bracket, impact when bare bracket struts to vascular wall can be reduced, while naked
After bracket first-order release, the bare bracket that can be opened according to half adjust anchor station again, improve bracket release accuracy and
Stability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the main body rack of first embodiment of the invention.
Fig. 2 is the distal structure schematic diagram of the first branch stent of first embodiment of the invention.
Fig. 3 is the distal sections schematic diagram of the first branch stent of first embodiment of the invention.
Fig. 4 is the structural schematic diagram of the extending bracket of first embodiment of the invention.
Fig. 5 is the structural schematic diagram of the anticreep barb of the extending bracket of first embodiment of the invention.
Fig. 6 is the structural schematic diagram of the main body rack of second embodiment of the invention.
Fig. 7 is the distal structure schematic diagram of the first branch stent of second embodiment of the invention.
Fig. 8 is the distal sections schematic diagram of the first branch stent of second embodiment of the invention.
Fig. 9 is the structural schematic diagram of the anticreep barb of the first branch stent of second embodiment of the invention.
Figure 10 is the structural schematic diagram of the extending bracket of second embodiment of the invention.
Figure 11 is the structural schematic diagram of the conveying device of endovascular stent for abdominal aorta of the invention.
Figure 12 is the cross-sectional view in the direction A-A in Figure 11.
Figure 13 is the cross-sectional view in the direction B-B in Figure 11.
Figure 14 is the mold expanded view of the metallic framework shaper of extending bracket of the invention.
Figure 15-18 is using process diagram of the invention.
Specific embodiment
Detailed description of the preferred embodiments with reference to the accompanying drawings.
Proximal end described in text refers to the one end of endovascular stent for abdominal aorta close to heart, distally refers to abdominal aorta overlay film branch
The one end of frame far from heart.
As Figure 1-Figure 5, the present invention provides a kind of endovascular stent for abdominal aorta, can be used for the intracavitary of abdominal aneurvsm and controls
It treats, can reduce stenter to implant backward shift, the incidence of the adverse events such as interior leakage, it includes main body rack 1 and two extensions
Bracket 2.
The main body rack 1 includes metallic framework 11 and overlay film 12.The metallic framework 11 includes several eyelets, each bullet
Property quoit is wavy.1 proximal end of main body rack can be to the annular bare bracket 13 of contract equipped with uncoated overlay film, this is naked
13 node of bracket is in W type, and there are two 131, second level wave crests 132 of level-one wave crest and two troughs 133 for tool.The level-one wave crest
131 is 5mm-15mm higher than the second level wave crest 132, can be used for discharging after 13 second level of bare bracket in transmission process.Trough 133 is by medical
Suture is attached with 12 material of overlay film, in order to guarantee bonding strength, bare bracket 13 and 12 overlapping material 2mm-5mm of overlay film.
The whole bare bracket 13 is in broadening formation, and internal diameter is gradually increased from inside to outside, 13 outer wall of bare bracket and 1 axis of main body rack
Between angle be 10-30 degree.Adjacent 131 top of level-one wave crest is equipped with the first fixed ring 3, which sets
There is the first hangnail 31 extended towards 1 rear end of the main body rack.132 top of second level wave crest is equipped with the second fixed ring 4.Two troughs
A trough top in 133 is equipped with the second hangnail 41 extended towards first hangnail 31.1 rear end of main body rack has first
Branch stent 5 and the second branch stent 6.The length of first branch stent 5 is greater than the length of second branch stent 6.This
The metallic framework of one branch stent 5 and the second branch stent 6 is located at the outside of overlay film.Folder between first hangnail 31 and bare bracket 13
Angle be 30 degree, for prevent main body rack 1 blood flow impact the effects of under to heart distally be displaced, the second hangnail 41 with it is naked
Angle between bracket 13 is 30 degree, for preventing tumor neck lesser curvature side bracket from shifting to heart proximal end, prevents overlay film from closing the arteria renalis
Branch vessel.
The extending bracket 2 also has metallic framework 21 and overlay film 22, and the top of two extending brackets 2 passes through anticreep knot respectively
Structure is fixedly connected on the distal internal of first branch stent 5 and the second branch stent 6.
The metallic framework of main body rack 1 and extending bracket 2 can be made of NiTi shape memory alloy material, heat treatment shaping
For sinusoidal waveform, " W " shape or the waveform that can be compressed, covering material can be medical polyester material, metallic framework and doctor
It is attached with terylene by suture.
The disconnecting prevention structure is：The distal medial of first branch stent 5 and the second branch stent 6 is equipped with several Anti-slip covers
Ring 7, each 7 section of anticreep lantern ring is arc-shaped, and circumferentially arranges, and the proximal-distal of anticreep lantern ring 7 does not block.Each extending bracket 2
Top periphery be equipped with anticreep barb 8 corresponding with the anticreep lantern ring 7, tip is backwards to the bare bracket 13 and extends outwardly, and is also in
Circumferential arrangement.The anticreep barb 8 is inserted into corresponding anticreep lantern ring 7.The anticreep lantern ring 7 is equal with 8 quantity of anticreep barb, is 3-
8.The metallic framework 21 of extending bracket 2 can be mutually indepedent, may be set to be integrated spiral formula structure.
In addition, to be equipped with the Wave crest and wave trough overlapped with the proximal end of the extending bracket 2 opposite for the proximal end of the main body rack 1
Two section small band support rings 10,10 string diameter of small band support ring be 0.1-0.4mm, head number be 10-20, can sufficiently will prop up
Frame proximal end covering material is held round, and lifting bracket reduces danger of leaking out in I type to the adaptability of knurl structure.
For the ease of adjustment bracket in the intracorporal position of people, the main body rack 1 and extending bracket 2 are equipped with developing mark.
" O " shape or the figure of eight can be made by gold, the metals such as platinum in developing mark.The developing mark of the main body rack 1 is set to this
12 proximal end of overlay film of main body rack 1, the intersection of first branch stent 5 and the second branch stent 6 and the first branch branch
The distal end of frame 5 and the second branch stent 6.The developing mark of the extending bracket 2 is set to 22 proximal end of overlay film of the extending bracket 2.
The overlap joint for adjusting two section brackets according to developing mark after first, second branch stent of the implantation main body rack 1 of extending bracket 2 is long
Degree makes its overlap length be greater than 20mm.
The above is the first embodiment of endovascular stent for abdominal aorta of the present invention, and Fig. 6-Figure 10 is that the present invention second is implemented
Example, is only that disconnecting prevention structure is different from the difference of first embodiment, which is：First branch stent 5 and second
The distal medial of branch stent 6 is equipped with several anticreep barbs 8, and each anticreep barb 8 circumferentially arranges, and tip is towards the bare bracket
It 13 and extends internally.The top periphery of each extending bracket 2 is equipped with anticreep lantern ring 7 corresponding with the anticreep barb 8.The anticreep lantern ring
7 sections are arc-shaped, also circumferentially arrange.The anticreep barb 8 is inserted into corresponding anticreep lantern ring 7.
As figs 11-13, the present invention also provides a kind of conveying device 9 of above-mentioned endovascular stent for abdominal aorta, it includes
Outer tube 91 and the middle pipe 92 inside the outer tube 91.Pipe 92 is located at 91 interior lower end of outer tube in this, has above pipe 92 in this
There is the accommodating space 93 for accommodating folded endovascular stent for abdominal aorta.Inner tube 94, the inner tube are equipped in this inside pipe 92
94 are pierced by the outer tube 91 and distal end equipped with the first lock collar 941, which extends outwardly equipped with several lock pins 942.This is interior
Central tube 95 is equipped in pipe 94, which is successively arranged the second lock collar 96, third lock collar 97 and sharp mouth 98.This
Two lock collars 96 and third lock collar 97 are polygonal star structure, and each star angle distal end is equipped with through-hole.First fixed ring 3 be inserted in this
In the star angle of three lock collars 97, which is inserted in the star angle of second lock collar 96.The lock pin 942 penetrates in each through-hole,
First fixed ring 3 and the second fixed ring 4 are limited in inside corresponding star angle.
In addition, the metallic framework 21 of extending bracket 2 of the invention is preferably integrated spiral structure, pattern is unfolded such as in side
Shown in Figure 14.
As shown in Figure 15-Figure 18, the present invention also provides a kind of application methods of above-mentioned endovascular stent for abdominal aorta, it is utilized
Above-mentioned conveying device 9, the application method include the following steps：
A. it will be put into the accommodating space 93 after endovascular stent for abdominal aorta compression.
B. by femoral artery notch, the outer tube 91 of the conveying device 9 is delivered to abdominal aneurvsm position.
C. 12 part of overlay film of the main body rack 1 is discharged, the two-stage wave crest of bare bracket 13 is in locking state, and root at this time
1 position of main body rack is adjusted according to the developing mark on overlay film 12.
D. 1 position of main body rack is adjusted according to 1 overlay film of main body rack, 12 proximal end developing mark, makes it have enough anchorings
Region, while not blocking renal artery branch blood vessel again, recession first lock collar 941 in adjustment good position rear portion point makes the lock pin 942
The through-hole of the third lock collar 97 is left, the first fixed ring 3 is discharged.Second level wave crest 132 is at this time still in locking state.
E. 1 position of main body rack is adjusted according to developing mark and bare bracket 13 again, continues first lock collar 941 of dropping back,
So that the lock pin 942 is left the through-hole of second lock collar 96, discharge the second fixed ring 4, discharges the bare bracket 13 completely, with blood vessel
Wall is gently bonded.
F. 2 opposite side of extending bracket is implanted into the second branch stent and fixed with the distal end of second branch stent and connected
It connects.
G. continue to pull down outer tube, after discharging the first branch stent completely, ipsilateral implantation extending bracket makes another extension branch
Frame is fixedly connected with the first branch stent distal end.
At this point, bracket discharges completely, the first hangnail 31, the second hangnail 41 become owner of arterial blood tube wall respectively, prevent from leading
Body support frame 1 is proximally shifted to distal travel and tumor neck lesser curvature side bracket, and the abundant anchoring of realization body bracket 1 is determined with accurate
Position, completes the intracavitary therapy of abdominal aneurvsm.
It should be noted that the above is only preferably specific embodiment of the invention, in order to make this
Field technical staff better understands the present invention, does not apply to limit the scope of the invention and apply, all in essence of the invention
Mind or principle within, any modification, equivalent substitution, improvement and etc. done should be included in the present invention protect within the scope of.
Claims (5)
1. a kind of endovascular stent for abdominal aorta, which is characterized in that it includes main body rack and two extending brackets；
The main body rack includes metallic framework and overlay film；The metallic framework includes several eyelets, and each eyelet is in
Waveform；What the main body rack proximal end was equipped with uncoated overlay film can be in W to the annular bare bracket of contract, the bare bracket node
Type, there are two level-one wave crest, a second level wave crest and two troughs for tool；Second level crest height of wave 5mm- described in the level-one crest ratio
15mm；Adjacent fist-order wave summit end is equipped with the first fixed ring, which is equipped with prolongs towards the main body rack rear end
The first hangnail stretched；The secondary wave summit end is equipped with the second fixed ring；A trough top in two troughs be equipped with towards this
The second hangnail that one hangnail extends；The main body rack rear end has the first branch stent and the second branch stent；Described first point
The length of branch bracket is greater than the length of second branch stent；The metal bone of first branch stent and the second branch stent
Frame is located at the outside of overlay film；
The proximal end of the main body rack and the proximal end of the extending bracket are equipped with two opposite sections of the Wave crest and wave trough overlapped
Small band support ring, the small band support ring string diameter are 0.1-0.4mm, and head number is 10-20；
The top of two extending brackets passes through disconnecting prevention structure respectively and is fixedly connected on first branch stent and the second branch stent
Distal internal；The metallic framework of the extending bracket is integrated helical structure.
2. endovascular stent for abdominal aorta according to claim 1, it is characterised in that：The disconnecting prevention structure is：Described first
The distal medial of branch stent and the second branch stent is equipped with several anticreep barbs, and each anticreep barb circumferentially arranges, tip
Towards the bare bracket and extend internally；The top periphery of each extending bracket is equipped with Anti-slip cover corresponding with the anticreep barb
Ring；The anticreep lantern ring section is arc-shaped, also circumferentially arranges；The anticreep barb is inserted into corresponding anticreep lantern ring；The anticreep
Lantern ring and anticreep barb quantity are equal, are 3-8；Or
The disconnecting prevention structure is：The distal medial of first branch stent and the second branch stent is equipped with several Anti-slip covers
Ring, each anticreep lantern ring section are arc-shaped, and circumferentially arrange；The top periphery of each extending bracket is equipped with and the anticreep lantern ring
Corresponding anticreep barb, tip is backwards to the bare bracket and extends outwardly, and also circumferentially arranges；Anticreep barb insertion is corresponding
In anticreep lantern ring.
3. endovascular stent for abdominal aorta according to claim 1 or 2, it is characterised in that：The bare bracket is integrally in loudspeaker
The shape of the mouth as one speaks, internal diameter are gradually increased from inside to outside, and the angle between the bare bracket outer wall and the main body rack axis is 10-30 degree.
4. endovascular stent for abdominal aorta according to claim 1 or 2, it is characterised in that：The main body rack and extension branch
Frame is equipped with developing mark；
The developing mark of the main body rack is set to overlay film proximal end, first branch stent and the second branch of the main body rack
The distal end of the intersection of bracket and first branch stent and the second branch stent；
The developing mark of the extending bracket is set to the overlay film of the extending bracket proximally and distally.
5. a kind of conveying device of endovascular stent for abdominal aorta described in any one of Claims 1-4, which is characterized in that it
Including outer tube and positioned at the middle pipe of the outer tube；Pipe is located at outer tube distal end in this, has above pipe for holding in this
Receive the accommodating space of compressed endovascular stent for abdominal aorta；It is equipped with inner tube in this inside pipe, which is pierced by the outer tube and close
End is equipped with the first lock collar, which extends outwardly equipped with several lock pins；It is equipped with central tube in the inner tube, the central tube is close
End is successively arranged the second lock collar, third lock collar and Jian Zui；Second lock collar and third lock collar are polygonal star structure, each star angle end
End is equipped with through-hole；First fixed ring is inserted in the star angle of the third lock collar, and second fixed ring is inserted in second lock
In the star angle of disk；The lock pin penetrates in each through-hole, and first fixed ring and the second fixed ring are limited in corresponding star angle
Portion.
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