CN208492413U - A kind of long size intravascular stent transportation system - Google Patents

Abstract

The utility model relates to a kind of long size intravascular stent transportation systems, and specifically, the stent delivery system is mainly made of tip (points), bracket, outer sheath, interior sheath, inner tube and handle etc..The stent delivery system of the utility model effectively solves that intravascular stent loads and release is not easy and leads to that bracket specification is limited, surgical procedure causes stent migration and positioning inaccurate, has boundless application prospect.

Description

A kind of long size intravascular stent transportation system

Technical field

A kind of long size lumen bracket conveying system fetters structure, position limiting structure, push structure by multilayer or multistage bracket Etc. structure compositions.

Background technique

Peripheral artery disease, Chinese medicine are referred to as vascular disease, and disease incidence has obvious rising in recent years, common as artery is narrow Narrow venereal disease change, arteriovenous thrombosis, aneurysm etc..Peripheral arterial stenosis occlusion venereal disease becomes, and is common in atherosclerosis, sugar Urinate disease, aorto-arteritis etc., be mainly shown as skin temperature reduction, muscular atrophy, touch it is lame less than pulse or pulse weakened, intermittence Row occurs distal limb necrosis, or even needs amputation when serious, threat to life when serious；Venous Thrombosis can cause suffering limb Blood stream stasis, swelling, while the risk for thering is Fatal pulmonary embolism to occur；Aneurism disease has knurl rupture big out at any time Blood, dead risk.Peripheral artery disease has very high disability rate and certain lethality, medical treatment to have little effect, operation Treatment is invasive treatment method, and effect is limited.

According to the peripheral arterial disease intravascular intervention of United States cardiovascular radiographies in 2014 and intervention association (SCAI) publication Treatment common recognition statement, almost all of master-common iliac artery peripheral arterial disease (PAD) can use intravascular Interventional Treatment, but Evidence show a certain brackets to be better than other kinds of bracket.A, B, C grades of master-common iliac artery PAD is classified as TASC, Intravascular Interventional Treatment is better than Intimectomy, and evidence shows that the former has more advantage (intra-arterial in terms of reducing mortality Membranectomy hospital mortality 2.7%).Due to operation risk problem, open operative treatment is the last selection of such disease； The success rate of intravascular Interventional Treatment is more than 90%, and the death rate is low, is to change lifestyles and move not can be effectively controlled symptom The Suitable therapeutic strategy of patient.

The classification standard of peripheral vascular stents has very much, can be divided into balloon-expandable and self-expanding with bracket delivery mode Formula bracket is divided into bare bracket, coating stent of medicine and overlay film frame with cradling function.It is divided into tubular bracket, ring with supporting structure Shape bracket, winding bracket and braided support.Timbering material includes stainless steel, NiTi and cochrome bracket.

Balloon expandable stent itself is nonelastic, and design is that bracket is mounted on sacculus in advance, by foley's tube that bracket is defeated It send to vascular lesion, is attached at vascular wall by vascular wall retraction force after balloon expandable to certain diameter, vascular wall is not produced Raw prolonged expansion tension.Great advantage is release registration, is suitable for opening lesion, such as vertebral artery opening, arteria renalis opening Lesion.Additionally have the characteristics that cripetura phenomenon is unobvious, radial support power is better than self-expandable stent after release.But balloon expandable Bracket itself easily occurs collapsing occlusion after lacking flexibility, being pressurized, and flexibility is not good enough, and it is dynamic to be poorly suited for cranium arteria carotis externa, Gu popliteal Arteries and veins etc. is vulnerable to pressure or turning joint position.It is suitable for the limitation short section of more straight, inactive joint area out of shape in peripheral blood vessel Stenosis occlusion lesion (< 4cm).

Self-expanding stent removes release branch by the way that bracket is compressed in delivery sheath and is transported at vascular lesion outside sheath Frame relies on and obtains equilibrium relation between bracket itself expansion tension and the elasticity limitation of vascular wall to attach vascular wall.From swollen The advantages of swollen bracket is that flexibility is preferable, is conducive to that the natural curvature of vascular wall can be complied with by distortion blood vessel and calcification lesion, It is not easy compressive deformation, even may span across turning joint release.Disadvantage is to be accurately positioned before having when discharging to jump and cripetura phenomenon Release is difficult.

Self-expanding stent is from compression loaded in delivery sheath, and to hemadostewnosis lesion is released to, bracket is radially expanded, and is propped up Frame axial length can also change, this depends on the connection structure of bracket, it is however generally that, using laser cutting, supporting structure For the self-expanding stent of straight line connection, apparent cripetura does not occur for axial length of the bracket after discharging in sheath.This kind of bracket Transportation system be usually made of a root sheath pipe and middle pipe, bracket is compressed in sheath, and middle pipe is placed in sheath, the distal end of middle pipe With the proximal contact of bracket.In stenter to implant surgical procedure, middle pipe position is remained stationary, and is withdrawn sheath, is made bracket from sheath Release.And self-expanding is fitted in blood vessel wall surface.The release system operatio of such bracket is simple, and release process stent length does not go out Existing significant changes.But since the support force of such bracket is weaker, and since peripheral blood vessel is long-term continuous mechanical by human body lower limbs The complicated applied force strain environment of movement and generation, the flexibility of such bracket and counter-bending kinking performance can not adapt to this completely Complicated applied force, bracket easily occur stress fatigue and bracket fracture occur after being chronically implanted, and blood vessel is caused restenosis symptom occur.Blood The decline of pipe long-term patency rate.Thus for such bracket for peripheral blood vessel, the treatment of especially Gu popliteal arteriarctia lesion is poor always Strong man's meaning.

And braiding structure being used, or using laser cutting, supporting structure is the class braiding structure of spiral connection, high degree The flexibility for improving bracket, the braiding structure of bracket is suitable for the complicated applied force strain environment of peripheral blood vessel.Significant drop Low bracket be chronically implanted after cradling piece fracture rate.Greatly improve the long-term patency rate of blood vessel.

But although this type braided support improves the patency rate of blood vessel, but bracket itself causes there are significant weakness Bracket is not easy to be properly implanted in surgical procedure.Due to the structural particularity of such bracket, bracket in sheath after discharging Axial length can be remarkably decreased, the obvious cripetura of stent length.If continued using above-mentioned " in pipe position remain stationary, withdraw Sheath discharges bracket from sheath " method for releasing, bracket during release can with release carry out and proximally move Position needs patient artificially to adjust the position of transportation system in the course of surgery, causes patient in surgical procedure that can not accurately control There is proximally and distally location difficulty in the positioning of bracket, bracket.Releasing position is not satisfactory.

To solve this problem, US20120310321A1 discloses a kind of transportation system that can compensate bracket cripetura, leads to The spring that can be compressed in middle pipe distal end setting one is crossed, after loading bracket, spring is in compressive state, when bracket discharges, place The displacement that bracket is mobile to distal end, and cripetura generates when for offsetting bracket due to release is pushed in the spring of compressive state.The party Method pushes bracket to compensate bracket cripetura amount by spring.And the thrust of spring depends on the frictional force of bracket and sheath, spring becomes Shape amount is not easily controlled, and can not effectively control the length of cripetura compensation.CN201210014832.X discloses reciprocal by ratchet Movement discharges the method for braided support paragraph by paragraph, the inner tube of a connection ratchet is arranged in rack bore, ratchet is an engageable branch The self-expanding device of frame inner wall, when inner tube is toward distal movement, ratchet drives bracket to travel forward, and releases that bracket partially from sheath It puts, when inner tube is moved toward proximal end, ratchet and bracket avoid bracket from being returned in sheath again by ratchet, pass through without engagement Reciprocating motion of this ratchet in stent cavity, by bracket " be pushed forward after drag " released from sheath.This transportation system knot It constitutes function and solves the problems, such as that braided support (especially long stent) can not be discharged due to the transmission difference of axial force.But this method Have the shortcomings that one it is significant, it is not easy to control bracket release after length.Due in surgical procedure patient bracket discharge when It needs constantly to drop back and adjusts the position of transportation system handle, cause bracket to be easily elongated release, especially long stent discharged Cheng Zhong, the length after bracket release are noticeably greater than the nominal length of bracket, and the proximal location substantial deviation expection of bracket is caused to set Fixed position, and bracket be elongated after seriously affected the therapeutic effect of bracket.Doctor needs a large amount of training practical operation that could control It is not stretched or compressed during bracket release processed.

There is excellent flexibility and counter-bending kinking performance and high support force in view of class braided support, it is wide General expectation is for treating peripheral blood vessel stenotic lesion, especially proximate to or across kneed Gu popliteal lesion.For this reason, it is necessary to open Class braided support that send out a kind of suitable and with the matched transportation system of bracket, bracket answers with good performance, and transportation system Bracket can be made accurate and quickly discharged into target lesion blood vessel.

Summary of the invention

The utility model aim is to solve self-expanding stent, release when especially long size bracket discharges in transportation system It is excessive to put power, and leads to that stent length specification is limited, surgical procedure causes stent migration and positioning inaccurate.

The first aspect of the utility model provides a kind of long size intravascular stent transportation system, the transportation system packet It includes:

Outer sheath,

Interior sheath, the interior sheath are set to inside the outer sheath, and the quantity of the interior sheath is N, N 1 To 10 positive integer；As N >=2, sheath is set to the inside of sheath in N-1 in N；Sheath is (i.e. as N=1, in N Sheath in first) it is set to the inside of the outer sheath；

Intravascular stent, the intravascular stent are set to the inside of the outer sheath and the interior sheath；

Middle ejector sleeve, the middle ejector sleeve are set to the inside of the outer sheath and the interior sheath, and with institute The intravascular stent stated offsets, for the intravascular stent to be pushed away to the outer sheath and interior sheath when in use, to release Put the intravascular stent；

Wherein, the outer sheath and the interior sheath are that coaxially arranged and described interior sheath can be described Outer sheath slide axially；

In another preferred example, the outer sheath is equipped with for discharging the intravascular stent, branch positioned at distal end Frame liberation port.

In another preferred example, the inner wall of the outer sheath is equipped with sliding limitation structure, the sliding limitation structure For limiting the sliding of sheath in first when sheath slides into predetermined position in first.

In another preferred example, be equipped with position limiting structure in the outer wall of interior sheath or proximal end, wherein in N sheath it is outer Position limiting structure on wall is denoted as N position limiting structure.

In another preferred example, the proximal end of interior sheath be equipped with position limiting structure, the position limiting structure be helical bracing wire or Flexible bracing wire.

In another preferred example, it is equipped with position limiting structure in the proximal end of interior sheath, the position limiting structure is extended by interior sheath It fixes and is formed to handle inner.

In another preferred example, the bracing wire is metal or nonmetallic bracing wire.

In another preferred example, first position limiting structure of sheath is to match in the sliding limitation structure and first 's.

In another preferred example, the sliding limitation structure is inner convex platform, and first position limiting structure is outer lug boss.

In another preferred example, the N of sheath is limited in the N-1 position limiting structure and N of sheath in the N-1 Structure matches.

In another preferred example, when the sliding limitation structure and first position limiting structure offset, described in limitation The sliding of sheath in first, wherein N=1；And when the N-1 position limiting structure and N position limiting structure offset, described in limitation The sliding of sheath in N, wherein N >=2.

In another preferred example, when the sliding limitation structure and first position limiting structure offset, described first The distalmost end of interior sheath is still located at the inside of the outer sheath.

In another preferred example, when the sliding limitation structure and first position limiting structure offset, described first Distalmost end distance d1≤2cm (preferably≤1cm, more preferably≤0.5cm) of the distalmost end of interior sheath and the outer sheath.

In another preferred example, the distalmost end distance d1 of the distalmost end of sheath and the outer sheath is 20 in described first ~200mm.

In another preferred example, when the N position limiting structure and N-1 position limiting structure offset, sheath in the N Distalmost end is still located at the inside of sheath in the N-1, wherein N >=2.

In another preferred example, when the N position limiting structure and the N-1 position limiting structure offset, in the N The distalmost end distance d of the distalmost end of sheath and the N-1_N≤ 2cm (preferably≤1cm, more preferably≤0.5cm), wherein N ≥2。

In another preferred example, in the N distalmost end of sheath and the N-1 distalmost end distance d_NFor 20~ 200mm。

In another preferred example, 2,3,4,5,6,7,8 or 9 N.

In another preferred example, 3,4 or 5 N.

In another preferred example, the system further include:

One inner tube, the inner tube and the interior sheath and the outer sheath are coaxially disposed, and are placed in centre；

Point, the point are set to the distal end of the outer sheath, and mutually solid with the distal end of the inner tube It is fixed；With

One handle, the handle are used to controlling and being pushed forward the middle ejector sleeve.

In another preferred example, the outer sheath is additionally provided with the label (Marker) for display position.

In another preferred example, the label is the becket to develop under X-ray.

In another preferred example, described is platinumiridio with the becket to develop under X-ray.

In another preferred example, the label is or tungsten powder with developing material of the pyrocondensation in outer sheath Ring.

In another preferred example, sheath and the middle ejector sleeve are integral types in described first.

In another preferred example, length is 80~400mm to the intravascular stent before releasing, and the intravascular stent exists Length after discharging at vascular lesion is 40~200mm.

In another preferred example, the diameter of the intravascular stent is 3.5-8mm.

In another preferred example, the epitheca length of tube is 700~1400mm and/or the epitheca pipe thickness It is 1.40~1.80mm, outer diameter 1.55-2.10mm for 0.08~0.25mm and/or the internal diameter of the outer sheath.

In another preferred example, the interior sheath length of tube be 80~350mm and/or interior sheath pipe thickness be 0.05~ 0.15mm and/or the internal diameter of the interior sheath are 1.2-1.45mm, outer diameter 1.3-1.65mm.

In another preferred example, the length of the middle ejector sleeve is the internal diameter of 800-1500mm and/or the middle ejector sleeve For 0.7-1.0mm, outer diameter 1.0-1.4mm.

The second aspect of the utility model provides a kind of method for discharging long size intravascular stent, and the method includes will The long size intravascular stent transportation system of the utility model first aspect is placed in patient's body,

The distal end of outer sheath is first transported to scheduled position, first pushes inner tube, said inner tube distal end has preceding machine for releasing Structure so that the stent expansion in preceding relieving mechanism be discharged into it is intravascular, then push in ejector sleeve the distal end of bracket is not discharged Outer sheath is left from the bracket liberation port in part, and the distal end of bracket first expands, while outer sheath and interior sheath are withdrawn backward, this When the relatively fixed holding position of inner tube, and sheath in first is pushed to distal end, until sheath position limiting structure and epitheca in first Pipe upper limit structure meets, so that sheath is proximally withdrawn together with outer sheath by limitation in first, so that the bracket is in Pipe continues to be released under the action of pushing forward to be expanded at vascular lesion；

As N >=2, sheath continuation is pushed forward in the latter, sheath in similar first, so that its remaining part of the bracket Divide from the bracket liberation port and leave outer sheath, the rest part of the bracket, which is released at vascular lesion, to be expanded.

The third aspect of the utility model provides a kind of bracket delivery system as described in the utility model first aspect The purposes of system, the intravascular stent are used to prepare the medical instrument for the treatment of lesion vessels, and the lesion vessels include: outside cranium Arteria carotis, Gu popliteal artery, aorta ascendens, descending aorta, abdominal aorta, the arteria renalis.

It should be understood that in the scope of the utility model, above-mentioned each technical characteristic of the utility model and below (such as implementation Example) in specifically describe each technical characteristic between can be combined with each other, to form a new or preferred technical solution.It is limited to Length, not repeated them here.

Detailed description of the invention

Structural schematic diagram is discharged before Fig. 1

The more sheath assembly relations of Fig. 2

Fig. 3 outer sheath

Sheath in Fig. 4

Fig. 5 outer sheath distal end end limits interior sheath schematic diagram

Sheath turnbuckle redundancy fixes schematic diagram in Fig. 6

The more sheath assembly relations of Fig. 7

Fig. 8 peripheral vascular stents transportation system

The more sheath assembly relation embodiments 2 of Fig. 9

Figure 10 inner ring boss structure schematic diagram

Sheath and middle pipe integral type schematic diagram in Figure 11

1 is tip head；2 be bracket；3 be outer sheath；4 be handle；5 be push button；6 be seal wire connector；7 be interior sheath；8 For middle ejector sleeve；9 be the middle layer of outer sheath；10 be the outer layer of outer sheath；11 be the pressure ring of outer sheath；12 be the internal layer of outer sheath； 13 be interior sheath main body；14 be interior sheath boss；15 be bracing wire；16 be distal section outer sheath；17 beckets；18 draw for spiral Line；19 be second interior sheath；20 set for outer sheath distal end last bit；21 be inner tube

Specific embodiment

The present inventor after extensive and in-depth study, develops long size intravascular stent transportation system for the first time.This is practical It is novel it was unexpectedly observed that long stent to be axially decomposed into the short bracket of multistage, the short bracket of multistage is broken down into axial multistage and set Cartridge type multilayer sheath package, multiple axial direction multistages and telescopic multilayer sheath are realized by different delivery modes and connection structure Bracket is uniformly accurately discharged.The utility model is completed on this basis.

Term

As used herein, " stent delivery system of the utility model ", " the intravascular stent transportation system of the utility model ", " long size intravascular stent transportation system of the utility model " etc. is used interchangeably, and is referred to described in the utility model first aspect Long size intravascular stent transportation system.

In the present invention, for convenience, term " distal end ", " proximal end " or " being pushed forward " are used.Ying Li Solution, these positional relationships are not made to the protection scope of the utility model additional for the position of patient It limits.

The long size intravascular stent transportation system of the utility model and the method for discharging long size intravascular stent

In the utility model, bracket is axially broken down at least 2 sections, preferably 3 sections.

Preferably, which includes at least 2 sections of sheath structures, by the way that bracket is carried out segmentation loading, by long stent It is decomposed into the short bracket of multistage to be wrapped up by multiple segmentation sheath inside pipe walls, and then realizes original whole segment length's bracket and single sheath inside pipe wall Completely attach to and generate larger frictional force be decomposed into the short bracket of multistage be in contact with multiple segmentation sheath inside pipe walls generate it is lesser Frictional force；Finally by the successively loading and release of the short bracket of multistage and multiple segmentation sheaths, realize that long stent is loaded and discharged Power is remarkably decreased.

Multiple segmentation sheath structures, as shown in Figure 1, by by the loading outer sheath of bracket be segmented into two sections or with On, preferably two-part；Distal section outer sheath 16 is by special Joining Technology, such as bonding or thermal welding, with transportation system Tip head 1 connect together, Tip head 1 is mutually fixed with the inner tube of transportation system simultaneously, is passed through toward distal end push inner tube, push is realized Distal section outer sheath 16 is mobile toward distal end, and then the bracket in distal section outer sheath 16 is discharged；Proximal end outer sheath is then proximally It is mobile, complete the bracket release in proximal segment outer sheath.And then finally realize that the whole continuous release of long stent is broken down into repeatedly Interval discharges, to effectively solve the problems, such as loading and the release of long stent.Preferably, which includes at least 2 layers of sheath Long stent is decomposed into the short bracket of multistage and wrapped up by multiple layering sheath inside pipe walls by structure by the way that bracket is carried out layering loading, And then the larger frictional force for realizing that original whole segment length's bracket and single sheath inside pipe wall are completely attached to and generated is decomposed into the short branch of multistage Frame is in contact with multiple layering sheath inside pipe walls and generates lesser frictional force；Finally by the short bracket of multistage and multiple layering sheaths It successively loads and discharges, realize that long stent loads and release force is remarkably decreased.

Multiple telescopic sheath structures, as shown in Fig. 2, the outer sheath of constraint bracket 2 is preferably 2 layers, respectively Outer sheath 3 and interior sheath 7, interior sheath 7 are located inside outer sheath 3, and interior 7 distal end of sheath is at regular intervals apart from 3 distal end of outer sheath, Spacing is preferably 20~200mm, and spacing is lower than 200mm so that the length distance that is fettered by outer sheath 3 of 2 distal end of bracket also below 200mm overcomes convenient for bracket 2 and releases from outer sheath 3 with the frictional force of outer sheath 3, our experimental study shows After 2 length of bracket in outer sheath 3 is more than 200mm, bracket 2 is difficult to overcome the frictional force with outer sheath 3, can not be from outer sheath 3 In release.

Further, the bracket 2 that interior sheath 7 fetters is shorter in length than the stent length in outer sheath 3, preferably 7 beam of interior sheath 2 length of bracket tied up is lower than 150mm, our experimental study shows that the internal diameter due to interior sheath 7 is lower than the internal diameter of outer sheath 3, The bracket 2 of same length is loaded, interior 7 inner wall of sheath is much higher than the friction of outer sheath 3 inner wall and bracket 2 with the frictional force of bracket 2 Power.Therefore the bracket 2 that preferably interior sheath 7 fetters is shorter in length than the stent length in outer sheath 3.

Preferably, which includes that interior sheath 7 and outer sheath 3 combine the realization side in intravascular stent transportation system Formula, optional implementation share 2 kinds.

Mode 1: as shown in figure 9, the distal end that interior sheath 7 is fixed on middle ejector sleeve 8 by the modes such as being bonded, welding, interior sheath Interior stent length is lower than 30mm, preferably 3-10mm.Bracket 2 is pushed to distal end by middle ejector sleeve 8, bracket 2 distally goes out epitheca Pipe 3 discharges, and middle ejector sleeve 8 continues to push bracket to distal end, and bracket is released from outer sheath 3 together with interior sheath 7, is propped up at this time 2 proximal end of frame still has portion support to be strapped in interior sheath 7.The major part of bracket 2 is released and is attached from outer sheath 3 In vascular wall.Middle ejector sleeve 8 is moved to the near end at this time, middle ejector sleeve 8 drives interior sheath 7 to move to the near end, due to the big portion of bracket 2 Point be attached on vascular wall, at this time in portion support in sheath 7 will not be moved to the near end with interior sheath 7, but with interior sheath Pipe 7 separates, and discharges on vascular wall.

Mode 2: interior sheath 7 does not keep relatively fixed with outer sheath 3, i.e., as shown in Fig. 2, by middle ejector sleeve 8 to distally pushing away Bracket 2 is sent, bracket 2 distally goes out outer sheath 3 and discharges, and 2 proximal end of bracket then drives interior sheath 7 mobile to distal end together.To outer sheath 3 Completely after discharging in outer sheath 3, middle ejector sleeve 8 continues to push bracket 2 to distal end interior bracket 2, it is likely that leads to interior sheath 7 As bracket 2 is separated from outer sheath 3 together.At this point, following 3 kinds of methods, which may be selected, limits interior sheath 7 not from outer sheath 3 In separate.

Method 1: the concave inward structure and 14 phase of boss structure of interior 7 proximal end of sheath generated by the pressure ring 11 in outer sheath 3 Cooperate (as shown in Figure 2,3, 4), realizes the limit of sheath 7 in during interior sheath 7 discharges bracket 2, reach in further discharging Bracket 2 in sheath 7, the purpose of the last bracket of release completely.

Method 2: it is preferred, as shown in figure 5, reality of the technical solution multilayer sheath that includes in intravascular stent transportation system Existing mode may be to set in the distal end last bit of outer sheath 3, form a necking or interior step, the distal end last bit of outer sheath 3 Setting internal diameter should be less than the outer diameter of interior sheath 7.To drive the distal end last bit to outer sheath to set by bracket 2 in the distal end of interior sheath When, the distal end last bit of outer sheath 7 is set internal sheath 7 and is stopped, so that sheath 7 distally continues toward distal end movement in limiting, And bracket 2 is then pushed to distal end by middle ejector sleeve 8 and is separated with interior 7 inner wall of sheath, to realize bracket releasing in interior sheath 7 It puts.

Method 3: the technical solution includes the mode realized in intravascular stent transportation system of Multilayer sleeve sheath can also With by fixing a guy structure on interior sheath proximal end, the other end and handle end or outer sheath 3 of bracing wire are fixed, and bracing wire is set It is set to certain redundant length, redundant length can be equal to or less than the stent length in outer sheath 3.In the middle ejector sleeve 8 after When continuing the bracket 2 into distal end push outer sheath 3, bracket 2 drives interior sheath 7 mobile to distal end together together with bracing wire, until releasing After 2 length of bracket in the outer sheath 3 put is equal to the redundant length of bracing wire, ejector sleeve 8 continues to push epitheca to distal end in the middle at this time When bracket 2 in pipe 3.Since the redundant length of bracing wire has been used up complete, bracing wire is in tension state, at this time in sheath 7 It will not continue to the distal end movement in the same direction of bracket 2 one, but be strapped in outer sheath 3 by bracing wire.Reach bracket 2 in interior sheath 7 The purpose that sheath is pushed forward in limiting during release.The redundant length of bracing wire is arranged, and can be straight line redundancy, or spiral Redundancy, as shown in Figure 6.

Preferably, telescopic multilayer sheath described in the technical solution, outer layer sheath be the internal layer with some strength by The woven network tube that smooth material is constituted, the i.e. usually described outer sheath；As shown in figure 3, the internal layer of the outer tube is PTFE, PFA etc. Medical grade low friction coefficient materials, a part of coated stent；The outer layer of the outer tube be medical polymer material, polyurethane, Pebax, nylon etc. are directly contacted with blood in the blood vessels；The middle layer of the outer tube is the woven network tube reinforced, and material is medical The metal knitted silk of grade, such as SS304, for reinforcing the intensity of tubing.

Preferably, which contains a position limiting structure prevents it from going out epitheca for limiting the forwardly moved position of interior sheath Pipe enters blood vessel.The limiting structure can be for the bottleneck structure of a kind of outer sheath being recessed or in the distal end of outer sheath Last bit sets the one section of necking to be formed.

Preferably, the interior sheath 7 of multilayer sheath described in the technical solution is by the smooth with low-friction coefficient of medical grade Material is made, which is chosen as the low friction coefficient materials such as pure PTFE, PFA, or contains adding for mesh grid in middle layer Qiang Guan.As shown in figure 4, the internal layer of the interior sheath wraps portion support 2, the usually proximal end of bracket 2, and the distal end of bracket 2 It is in contact with the internal layer of outer sheath.

Preferably, the limiting structure which is adapted to containing one with outer sheath 3, for limiting the limitation of interior sheath 7 When structure is mobile to distal end, no more than the position limiting structure in outer sheath 3.The limiting structure can be and 3 limiting structure of outer sheath The boss that the proximal outer diameter of adaptation becomes larger.

Preferably, stent delivery system can be composed of the scheme of foregoing description.If sheath is by 2 segmentation sheaths and 2 A layering sheath composition, outer sheath are divided into 2 sections, and outer sheath and the inner tube of distal end are kept fixed, and are contained in the outer sheath of proximal end Sheath in one forms 2 layering sheaths.To which bracket is resolved into 3 sections of progress releasing by parts.

Preferably, according to the actual situation, if the release force of long stent is excessive, two segmentation sheaths as above and 2 layering sheaths The composition form of pipe does not still meet the requirement of low release force, can further be layered 2 layering sheath further progresss, Such as 3 layering sheaths or more, telescopic release is formed, so that bracket, which is resolved into 4 sections or more, carries out releasing by parts.Such as figure Shown in 7, in original layering on the basis of sheath 7, increases another and be layered interior sheath 18, ejector sleeve 8 carries out bracket in the middle When being pushed forward release, interior sheath sleeve is pushed forward together with bracket, when on outer tube 3 interior concave station with it is convex in first interior sheath 7 When platform meets, bracket is released from first interior sheath 7, at this time second interior sheath 18 still with bracket together before It moves, until when the boss on the boss and first interior sheath 7 in second interior sheath 18 meets, bracket is from second interior sheath It is released in 18, and then realizes bracket in the release several times of telescopic interior sheath, reached and further decrease release force Purpose.

The major advantage of the utility model includes:

Due to the long feature of the generally existing length of lesion of the lesions such as narrow of peripheral blood vessel, treat such lesion when It waits, the length issue for having specification due to being limited to bracket, it is sometimes necessary to which two even multiple brackets are placed in docking, in this way The complexity of operation and the financial burden of patient are greatly improved, simultaneously because there may be some potential for docking location Other problems, and cause medium-long term patient to be benefited and decrease.And the design that the utility model is proposed, it can effectively solve the problem that length Bracket is not easy the problems such as being loaded and discharging, and is capable of the length specification of effective lifting bracket, and then can pass through a bracket Implantation reach the lesions such as the long hemadostewnosis for the treatment of.The complexity that operation can be effectively reduced and the economy for reducing patient are born Load.

The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this Utility model rather than limitation the scope of the utility model.In the following examples, the experimental methods for specific conditions are not specified, leads to Often according to normal conditions, or according to the normal condition proposed by manufacturer.Unless otherwise stated, otherwise percentage and number be by weight It calculates.

Embodiment 1

A kind of more sheath structures are present embodiments provided, intravascular stent loading is can effectively solve and release is not easy and causes The problems such as bracket specification is limited, surgical procedure causes stent migration and positioning is inaccurate.It is illustrated in figure 8 peripheral vascular stents conveying The overall structure diagram of system.The transportation system is mainly made of tip, bracket, outer sheath, handle etc..Wherein tip can To be generally the lower medical polymer material of hardness, preferably Pebax3533；2 be peripheral vascular stents, preferred long For metric lattice in 40~250mm etc., diameter specifications are that 4.0~8.0mm is differed, and can be the bracket of the forms such as braiding and cutting, Preferably braided support；

As shown in Fig. 2, being the Standard relational graph of more sheaths, bracket a part is bound in outer sheath, another portion Divide and is bound in interior sheath；Bracket positioning after, during release, middle ejector sleeve is pushed forward by the control of handle, at this time due to The frictional force of outer sheath and interior sheath is far smaller than the frictional force for being bound in interior sheath inner support and interior sheath, so bracket quilt While middle pipe releases outer sheath, interior sheath follows bracket to be pushed forward together, when the bracket being strapped in outer sheath is all released Afterwards, the indent position limiting structure as caused by pressure ring is just contacted with the boss limiting structure in interior sheath in outer sheath at this time, from And the Forward of interior sheath is limited, middle ejector sleeve continues to be pushed forward at this time, and bracket is just released interior sheath, finally reaches release branch completely The purpose of frame.

3 be outer sheath, the woven network tube generally reinforced, as shown in figure 3, the specification of the outer sheath is generally in 5F~7F, Preferably 6F.Inner layer material is the medical polymer material with smoothness, preferably PTFE.Middle layer material is by more The braiding reinforcing mat that stock braided wires are constituted, preferred material are stainless steel 304, weave PPI 40~120.Cladding material is general For the higher medical polymer material of hardness, preferably 72D or more, such as Pebax or nylon 12.In the outer sheath The concave inward structure being made of pressure ring is contained position in portion, for limiting being pushed forward for interior sheath.

As shown in figure 4, being the structural schematic diagram of interior sheath, material is the medical polymer material with smoothness, Preferably PTFE, or there is the PTFE tube for reinforcing mesh grid.One section of PTFE of proximal end pyrocondensation of the interior sheath is used for shape The step being pushed forward at sheath in limiting.

Embodiment 2

It is equally the structure using more sheaths in the present embodiment, wherein different limiting being pushed forward for interior sheath.Such as Fig. 9 Shown, outer sheath does not have the concave inward structures such as pressure ring at this time, and by fixing a bracing wire in interior sheath, it is subsequent that bracket is gone out outer sheath Continue interior sheath during being pushed forward bracket to be held by bracing wire, will not continue to be pushed forward, and then realize the complete release of bracket.Wherein should Bracing wire can be also possible to non-metaliic form for metal, by a stay thimble, i.e., the fixed form with interior sheath can be Bracing wire welds together with stay thimble, and stay thimble is fixed by the pyrocondensation of ectonexine PTFE.

Embodiment 3

The present embodiment is with embodiment 1, boss structure in the interior sheath, as shown in Figure 10, by using pyrocondensation Smoothness material, such as PTFE cover the suitable becket of a upper size, then by pyrocondensation PTFE pyrocondensation in lining core skill in lining core It is finally becket forming an inside, outside is the rigid step structure of PTFE on art ring.

Embodiment 4

In the present embodiment, the interior sheath structure is also possible to interior sheath and middle pipe integral type as shown in figure 11, can To be to carry out grinding table rank on middle ejector sleeve, to reduce occupied space, after fixed with glue or pyrocondensation PTFE with middle pipe；It should Bracket in structure in sheath is unsuitable too long, so as not to cause bracket cannot in the smooth abjection in interior sheath, the length with 5~ 30mm long is advisable.

It is incorporated herein by reference in all documents that the utility model refers to, just as each document quilt It is individually recited as with reference to such.In addition, it should also be understood that, after having read the above-mentioned teaching content of the utility model, this field skill Art personnel can make various changes or modifications the utility model, and such equivalent forms equally fall within the application appended claims Book limited range.

Claims (10)

1. a kind of long size intravascular stent transportation system, which is characterized in that the transportation system includes:

Outer sheath,

Interior sheath, the interior sheath are set to inside the outer sheath, and the quantity of the interior sheath is N, and N is 1 to 10 Positive integer；As N >=2, sheath is set to the inside of sheath in N-1 in N；As N=1, sheath (i.e. first in N Interior sheath) it is set to the inside of the outer sheath；

Intravascular stent, the intravascular stent are set to the inside of the outer sheath and the interior sheath；

Middle ejector sleeve, the middle ejector sleeve are set to the inside of the outer sheath and the interior sheath, and with it is described Intravascular stent offsets, for the intravascular stent to be pushed away to the outer sheath and interior sheath when in use, to discharge institute The intravascular stent stated；

Wherein, the outer sheath and the interior sheath are that coaxially arranged and described interior sheath can be described outer Sheath slides axially.

2. stent delivery system as described in claim 1, which is characterized in that the inner wall of the outer sheath is equipped with sliding limit Bit architecture, the sliding limitation structure is for limiting the cunning of sheath in first when sheath slides into predetermined position in first It is dynamic.

3. stent delivery system as described in claim 1, which is characterized in that be equipped with limit in the outer wall of interior sheath or proximal end Structure, wherein being denoted as N position limiting structure for the position limiting structure on the outer wall of sheath in N.

4. stent delivery system as described in claim 1, which is characterized in that the system further include:

One inner tube, the inner tube and the interior sheath and the outer sheath are coaxially disposed, and are placed in centre；

Point, the point is set to the distal end of the outer sheath, and mutually fixes with the distal end of the inner tube；With

One handle, the handle are used to controlling and being pushed forward the middle ejector sleeve.

5. stent delivery system as described in claim 1, which is characterized in that length is the intravascular stent before releasing 80~400mm, length of the intravascular stent after discharging at vascular lesion are 40~200mm.

6. stent delivery system as described in claim 1, which is characterized in that the epitheca length of tube be 700~ 1400mm and/or the epitheca pipe thickness be 0.08~0.25mm and/or the internal diameter of the outer sheath be 1.40~ 1.80mm, outer diameter are 1.55~2.10mm.

7. stent delivery system as described in claim 1, which is characterized in that the interior sheath length of tube is 80~350mm, And/or interior sheath pipe thickness is 0.05~0.15mm and/or the internal diameter of the interior sheath is 1.2~1.45mm, outer diameter is 1.3~1.65mm.

8. stent delivery system as described in claim 1, which is characterized in that the length of the middle ejector sleeve be 800~ The internal diameter of 1500mm and/or the middle ejector sleeve is 0.7~1.0mm, and outer diameter is 1.0~1.4mm.

9. stent delivery system as described in claim 1, which is characterized in that the diameter of the intravascular stent be 3.5~ 8mm。

10. stent delivery system as described in claim 1, which is characterized in that the outer sheath is additionally provided with for showing The label of position, the label are the becket to develop under X-ray.