CN209499992U - A kind of iliac vein bracket - Google Patents

Abstract

The utility model relates to the field of medical instrument technology, more particularly, to transplanting vascular endoprostheses, specifically disclose a kind of iliac vein bracket, it includes proximal segment, interlude and distal ports, interlude nearer end section and distal ports have bigger flexibility, interlude includes waveform bar and connecting rod, and the central axis of waveform bar approximate helical line spiral surrounding tubulose constitutes flexible tubular support construction, and connecting rod is fixedly connected with the adjacent part in adjacent waveform bar or waveform bar along the length direction of tubulose.The utility model iliac vein bracket is able to solve the technical problems such as prior art iliac vein stent anchors ability low, submissive performance is poor, support performance deficiency.

Description

A kind of iliac vein bracket

Technical field

The utility model relates to the field of medical instrument technology, more particularly, to transplanting vascular endoprostheses.

Background technique

Venous disease is disease relatively common in vascular surgery, especially deep vein thrombosis and great saphenous varicose vein, this If two kinds of diseases cannot treat easy thrombus in time and be back to heart, so as to cause serious consequences such as pulmonary embolism.And this Very big one of the formation of two kinds of diseases the reason is that detection of iliac vein compression syndrome (iliac vein compression syndrome, IVCS), the incidence of current detection of iliac vein compression syndrome is up to 20%~34%.

Treatment iliac vein compression usually requires major surgery all the time, and wound is larger, and general patient is difficult to receive this Operation.Recently as the development of technology, the mode for intervening operation starts to be applied, begins with and used by way of intervention Balloon dilatation and stenting implantation mode come solve the problems, such as iliac vein oppress.Since the technology has, wound is small, effect is good Feature and gradually received.Compared to balloon expandable, the mode of stenter to implant has the effect of long-term.Currently used implantation Bracket is self-expansion type bracket, is the superelastic alloy thin-wall tube such as NiTi by super-elasticity branch made of laser accurate engraving Frame reaches lesion by pressure drot gfasplng delivery conduit, and releasing self expandable after fixing makes unobstructed blood, and plays support to diseased region Effect.

However, the vascular anatomy morphological differences due to patient is larger, it is more that few brackets can accomplish that a kind of design adapts to The case where kind case.Also, intravascular stent domestic at present be all mostly designed for treatment arteriovascular-related diseases, though have minority The arterial bracket of suitable dimension is applied to vein, such as iliac vein, but its therapeutic effect is still difficult to reach expected.Reason exists It differs greatly in the physiology and appearance of vein and artery, vein is smaller compared with artery its blood vessel diameter, blood vessel bending shape is more complicated, Intravascular tissue construction is complicated, higher to the requirement of the positioning of bracket, supportive and flexibility, and arterial bracket generally cannot be answered directly It uses in vein, and the bracket that the domestic design feature for vein designs at present is less.

Chinese patent CN201520126120.6, which discloses one kind, can be taken off self-inflated bone vein bracket, which only does short Phase implantation is used, and can not provide iliac vein long-term support, and the submissive performance of bracket is insufficient, cannot be bonded iliac vein well Vascular wall is easy to produce the formation of secondary thrombus in bracket.Chinese patent CN201610268333.1 discloses a kind of blood vessel branch Frame, the bracket are that a kind of straight barrel type of closed loop designs, and the flexibility of bracket is poor, and bracket cannot comply with the shape of blood vessel well State is not suitable with the case of iliac vein vascular bending.

Prior art iliac vein bracket still has problems: support performance is insufficient, cannot restore bone venous blood flow shape State increases blood flow；Flexibility is insufficient, cannot comply with vascular morphology, be easy to produce the formation of secondary thrombus in bracket.Therefore, It is necessary to continue to study for iliac vein bracket.

Summary of the invention

The technical problem to be solved by the present invention is to provide a kind of iliac vein brackets, are able to solve prior art iliac vein Stent anchors ability is low, submissive performance is poor, the technical problem of support performance deficiency.

In order to solve the above technical problems, technical solution adopted in the utility model is:

A kind of iliac vein bracket, in a tubular form, the length direction along the tubulose include proximal segment, interlude and distal end Section, the interlude proximal segment and distal ports have bigger flexibility；

The interlude includes waveform bar and connecting rod, and the waveform bar is the multiple waveform knots arranged along its length Structure is constituted, and the central axis of tubulose described in the waveform bar approximate helical line spiral surrounding constitutes flexible tubular support construction, institute State the adjacent part that connecting rod is fixedly connected in adjacent waveform bar or waveform bar along the length direction of the tubulose.

Bracket interlude is used the waveform bar of spiral structure and is axially connected with connecting rod along stand tube, and bracket interlude is made With good flexibility, meet vein blood vessel due to patient is different and changeable physiological anatomic architecture, while in same vessel week In length, waveform bar has bigger body of rod length compared to straight-bar, thus has the contact area bigger with vascular wall, waveform bar Waveform configuration is presented upwards in vessel axis compared to straight-bar, thus there is the bigger bearing area to vascular wall, is capable of providing Stronger support performance and adherent effect.

Different location phase of the shank diameter of the spiral density of the waveform bar of the interlude and/or waveform bar in interlude It is same or different, so that the interlude has identical or different flexibility in different location.

Optionally, the tubular length of the bracket is 60-120mm, and proximal segment, interlude and the distal ports of bracket are along bracket The length ratio in tubular length direction is 2.5-3.5:4.5-5.5:1.5-2.5, preferably 3:5:2.

The utility model proposes further to improve also directed to the intermediate segment structure of bracket:

A kind of optional embodiment, the interlude include a waveform bar, the waveform bar approximate helical line The central axis of tubulose described in spiral surrounding constitutes single-screw flexible tubular support construction.

A kind of preferred embodiment, the interlude includes two or more waveform bars, described two Or more than two waveform bars are intervally arranged, and tubulose described in approximate helical line spiral surrounding central axis constitute double helix or More helical flexible tubular support structures.

The utility model proposes further to improve also directed to the proximal segment of bracket, distal ports, the proximal segment and/or remote End section includes waveform bar and connecting rod, and the central axis of tubulose described in the waveform bar approximate helical line spiral surrounding constitutes tubulose Support construction, the connecting rod are fixedly connected with the adjacent portions in adjacent waveform bar or waveform bar along the length direction of the tubulose Point；

The spiral density of the waveform bar of the proximal segment and/or distal ports and/or the shank diameter of waveform bar are greater than described The spiral density of the waveform bar of interlude and/or the shank diameter of waveform bar.

Proximal segment, the distal ports of bracket can use the similar structure of interlude as previously described, by adjusting waveform bar The shank diameter of spiral density and/or waveform bar is to improve the ability that proximal segment and distal ports anchor in the blood vessel.

In above scheme, the preferred connecting rod of the utility model is in straight-bar substantially, connection waveform bar along the tubulose The wave crest or trough of the adjacent wave of length direction, connecting rod are spacedly distributed on the pipe week of the tubular bracket.Preferably, institute Wave is stated in Z-shaped wave structure.

Embodiment still further preferably, when the interlude is that two waveform bars are constituted, the interlude connects The wave crest or trough of three adjacent waves of the length direction along the tubulose of extension bar connection waveform bar.

Preferably, the shank diameter of waveform bar is 0.1~0.4mm, and the shank diameter of connecting rod is 0.1~0.3mm.

The utility model proposes another improvement, the proximal segment and/or distal end also directed to proximal segment, the distal ports of bracket Section includes multiple connecting rods, and it is the reticular supporting structure substantially to assume diamond in shape that the multiple connecting rod, which is interconnected and form cellular construction,.Net Shape support construction has superior supportive since its cellular construction is closed, and proximal segment and/or distal ports can be made steady Solid anchoring in the blood vessel, so as to avoid bracket from being shifted by the diseased region that discharges, improve long-term therapeutic effect.

Based on above scheme, the utility model yet further proposes a kind of improvement, the diameter of the iliac vein bracket by Proximate gradually becomes smaller, the central axis of tubulose described in the waveform bar approximation conical spiral spiral surrounding.Bracket tool There is the unequal pyramidal structure of both ends diameter, preferably can be adapted to and support in shape the vein blood vessel of Diameter Gradual Change.

Preferably, the diameter of the iliac vein mount proximal end mouth is 10-18mm, and the diameter of far distance port is 10-14mm.

Based on above scheme, the utility model also further proposes a kind of improvement, the proximal segment of the iliac vein bracket End face is inclined-plane, the proximal end inclined open of the iliac vein bracket can with blood vessel the oblique branch vessel of bifurcation nozzle Match.

The utility model iliac vein bracket can be cut by tubing or is made of metal wire knitted.Preferably tubing Through being cut into, the waveform bar and connecting rod of the iliac vein bracket are integrated composition tubular structure.For example, using laser cutting Nickel-titanium alloy is made.

To sum up, the utility model iliac vein bracket has the advantages that compared with the prior art

(1), bracket interlude is constructed using conveyor screw, has its nearer end section and distal ports preferably flexible, can Meet vein blood vessel due to patient is different and changeable physiological anatomic architecture, the flexibility of bracket are more preferable, it is thus possible to preferably It is bonded curved blood vessel wall；Meanwhile proximal segment compares interlude with distal ports can play the role of better anchoring in the blood vessel, keeps away Exempt from stent migration, guarantees the therapeutic effect long-term to diseased region.

(2), bracket interlude mainly uses waveform bar to provide the radial support power to vascular wall, when bracket is when curved It waits, the big curved side of bracket is stretched, and the waveform configuration of waveform bar can play the role of axial stretch-proof at this time, provides axial return Elastic force can preferably maintain the tubular support structure of bracket, while the wave crest of waveform bar or trough drawn subtended angle become larger, Enable blood vessel to have greater area of bracket overlay area in big curved side, thus provides good adherent and support performance.

(3), bracket has the unequal pyramidal structure of both ends diameter, preferably can be adapted to and support in shape diameter The vein blood vessel of gradual change, can be avoided rack far end overdistension keeps bracket inconsistent in the support force radially generated and causes to paste Wall is bad or to vascular damaged.

(4), the proximal end inclined open of bracket can match with blood vessel in the nozzle of the oblique branch vessel of bifurcation, from And effectively prevent the secondary thrombus generation that conventional stent stretches out initiation in blood vessel crosses.

Detailed description of the invention

With reference to the accompanying drawing, the utility model is described in further detail.

Fig. 1 is a kind of schematic diagram of embodiment of the utility model iliac vein bracket；

Fig. 2 is the waveform bar local expansion of single coil configuration used by a kind of embodiment of the utility model iliac vein bracket Structural schematic diagram；

Fig. 3 is double-stranded waveform bar part exhibition used by the utility model iliac vein bracket another kind embodiment Opening structure schematic diagram；

Fig. 4 is the bracket local expansion structural schematic diagram of embodiment illustrated in fig. 3；

Fig. 5 is the partial enlargement diagram in the portion A in Fig. 4；

Fig. 6 is the partial enlargement diagram in the portion B in Fig. 4；

Fig. 7 is the utility model embodiment iliac vein stenter to implant to a kind of position close to ideal anatomical structure iliac vein Schematic diagram；

A kind of position for the iliac vein that Fig. 8, which is the utility model embodiment iliac vein stenter to implant, to be bent to anatomical structure shows It is intended to；

Fig. 9 is the schematic diagram that the utility model embodiment iliac vein bracket is in bending shape；

Figure 10 be in Fig. 9 bracket interlude in the waveform bar local deformation schematic diagram of big curved side；

Figure 11 is the exhibition of the proximal segment and interlude transition connection portion point of the utility model iliac vein bracket one embodiment Opening structure schematic diagram.

It should be noted that waveform bar and connecting rod are not shown in Fig. 1, Fig. 7, Fig. 8 and Fig. 9, but in simplified form Iliac vein bracket is illustrated.

In each attached drawing, to the reference numerals are as follows:

101, inferior caval vein；102, left iliac vein；103, right iliac vein；1012, left iliac vein and inferior caval vein cross Place；110, proximal port；120, far distance port；130, proximal segment；140, interlude；150, distal ports；211, wave crest；212, trough； 213, connecting rod；214, waveform bar.

Specific embodiment

For technical problems such as prior art iliac vein stent anchors ability low, submissive performance is poor, support performance deficiencies, originally Utility model provides a kind of iliac vein bracket, and can obtain simultaneously by using the waveform rod structure of spiral structure has well The bracket of flexibility and enabling capabilities, and in the bracket between section and its proximal segment, distal ports make differentiation design so that bracket exists Anchoring ability in blood vessel is promoted, and the flexibility of interlude is more preferable, be can satisfy the changeable anatomical structure of vein blood vessel, is complied with complexity Vascular morphology, there is good adherent effect, effectively avoid the formation of secondary thrombus in bracket, guarantee long-term to diseased region Therapeutic effect.

The utility model is described in further detail with reference to the accompanying drawings and detailed description.

Embodiment 1

A kind of iliac vein bracket, in a tubular form, the length direction along tubulose include proximal segment 130, interlude 140 and distal end Section 150, referring to Fig. 7,140 nearer end section 130 of interlude and distal ports 150 have bigger flexibility.The centre of iliac vein bracket Section 140 includes waveform bar 214 and connecting rod 213, and waveform bar 214 is the body of rod that waveform is presented along its length, waveform bar 214 The central axis of approximate circular helix spiral surrounding tubulose constitutes flexible tubular support construction.

The waveform of waveform bar is optional, can be continuous form, such as each waveform joins end to end in order, or non- It is connected between continuous form, such as the waveform of multiple arrangements by straight-bar interval；It can be arranged simultaneously on same waveform bar a variety of Different waveforms, such as sinusoidal configuration, " Ω " shape wave structure, Z-shaped wave structure, may be set to be a kind of waveform is unit The duplicate form of wave, those skilled in the art can voluntarily select as needed, for example, the present embodiment Fig. 4 is shown continuously Z-shaped wave repeats arrangement.Obviously, rounded end design is done at the wave crest of wave and trough, can reduce waveform bar in wave Stress at peak and trough is concentrated, and reducing pointed end may be to the damage of vascular wall.

Referring to fig. 4, the local expansion structure of the present embodiment bracket interlude 140, length of the connecting rod 213 along tubulose are shown Degree direction is fixedly connected with adjacent waveform bar 214, and wherein iliac vein bracket interlude 140 includes two waveform bars being intervally arranged.

Referring to Fig. 3, for the double-stranded local expansion schematic diagram that two waveform bars are constituted, a2 and a1, c2 and c1, e2 With the breakpoint that e1, g2 and g1 are when first waveform bar is unfolded, b2 and b1, d2 and d1, f2 and f1, h2 and h1 are second waveform Breakpoint when bar is unfolded is three wave coil structures of first waveform bar between a1 and c2, between c1 and e2, between e1 and g2, It is three wave coil structures of second waveform bar between b1 and d2, between d1 and f2, between f1 and h2, it will by aforementioned breaking point assemblage It is sequentially connected the double-spiral structure for constituting the combination of two waveform bars, two waveform bar approximation circular helix spiral surrounding pipes The central axis of shape constitutes double helix flexible tubular support construction.

Obviously, those skilled in the art can also be intervally arranged using more waveform bars, constitute more helical flexible tubuloses Support construction.For example, be intervally arranged using 3,4 or 5 waveform bars, each waveform bar approximation circular helix spiral surrounding pipe The central axis of shape constitutes three spirals, four spirals or five helical flexible tubular support structures.

In the present embodiment, connecting rod 213 is in 140 structure of interlude of iliac vein bracket, to connect edge substantially in straight-bar The wave crest 211 or trough 212 of the adjacent unit wave of the length direction of tubulose.Preferred embodiment, connecting rod 213 are at least connected with The wave crest 211 or trough 212 of two adjacent unit waves, connecting rod 213 are spacedly distributed on the pipe week of tubulose.Specific to this Embodiment shows double-stranded iliac vein bracket local expansion structure, including two waveforms referring to fig. 4, Fig. 5 and Fig. 6 Bar 214, two corresponding arrangements in the interval of waveform bar 214, wave crest, the trough of previous waveform bar respectively correspond the latter waveform bar Wave crest, trough, along the length direction of tubular bracket, connecting rod 213 connects the wave crest 211 or trough of three adjacent unit waves 212, so that two neighboring wave circle is fixedly connected with a wave circle of therebetween another waveform bar in a waveform bar.

The length direction that the waveform bar 214 of helical structure combines through connecting rod 213 along tubulose is fixed, and can preferably be maintained The tubular support structure of bracket, while there is excellent flexibility, when bracket bent, bracket wave at its curved inner side and outer side Different deformation behaviors is presented in shape bar part.

For details, reference can be made to Figure 10, show the waveform bar 214 of the interlude 140 of iliac vein bracket in big curved side (i.e. outside) Local deformation schematic diagram.In big curved side, stress is stretched according to arrow direction to both ends bracket by bending, at this time waveform bar 214 Gap u1 between two section wave circles is increased to u1 ', and the angle u3 between wave crest 211 is increased to u3 ', and wave height u2 is reduced to u2 ', wave This deformation of shape bar 214 can offset certain axial bending tensile stress, and waveform bar 214 along bracket tube axial direction have compared with Big inclination angle enables bracket to have bigger bending angle in big curved side and is unlikely to be broken connecting rod 213 because of stretching.

Conversely, waveform bar 214 is pressurized in lesser curvature side (i.e. inside), the gap u1 between two section wave circles reduces, wave crest 211 it Between angle u3 reduce, wave height u2 increases, and this deformation of waveform bar 214 can offset certain axial bending compression, thus It can reduce 213 bending deformation of connecting rod, and reduce bracket wave circle because of two section wave circles generation caused by bracket bent Overlapping, avoids the wave crest 211 of bracket from being partially project into the intracavitary portion of stand tube.

The waveform bar of helical structure plays the role of radial support as tubular support structure, to vascular wall, while along bracket Length direction have good flexibility, blood vessel flexed configuration can be matched, have good adherent effect.

Obviously, by the different location in interlude 140 be arranged the spiral density of waveform bar 214, shank diameter it is identical or Difference can make interlude 140 have identical or different flexibility in different location.For example, the shank diameter of waveform bar 214 In identical situation, increasing spiral density makes its screw pitch be intended to 0, can reduce the flexibility of this section, to obtain preferably branch Performance is supportted, and reducing spiral density increases its screw pitch, can be improved the flexibility of this section, but support performance reduces.Similar, Increase the shank diameter of waveform bar 214, i.e. the body of rod is thicker, and bending property reduces, and the flexible of this section reduces, and support performance increases Greatly；Reduce the shank diameter of waveform bar 214, i.e. the body of rod is thinner, and bending property improves, and the flexible of this section increases, support performance It reduces.Rod body material is chosen as metal, polymer elastomeric material, in the case where rod body material is selected fixed, this field Technical staff can obtain required flexibility and supportive by adjusting the diameter and spiral density of the body of rod.

Optionally, the shank diameter w1 of waveform bar 214 is 0.1~0.4mm, the shank diameter w2 of connecting rod 213 is 0.1~ 0.3mm。

Based on described above, the present embodiment proposes further to improve also directed to proximal segment 130, the distal ports 150 of bracket.

A kind of optional embodiment, proximal segment 130 and distal ports 150 include waveform bar 214 and connecting rod 213, waveform The central axis of the approximate circular helix spiral surrounding tubulose of bar 214 constitutes tubular support structure, length of the connecting rod 213 along tubulose Degree direction is fixedly connected with the adjacent part in adjacent waveform bar 214 or waveform bar 214；

The spiral density of the waveform bar 214 of proximal segment 130 and distal ports 150 and/or the shank diameter of waveform bar 214 are greater than The spiral density of the waveform bar 214 of interlude 140 and/or the shank diameter of waveform bar 214.

Proximal segment 130, the distal ports 150 of bracket can use the similar structure of interlude 140 as previously described, and pass through tune The spiral density of whole waveform bar 214 and/or the shank diameter of waveform bar 214 are to improve proximal segment 130 and distal ports 150 in blood vessel The ability of middle anchoring.

Another optional embodiment, proximal segment 130 and/or distal ports 150 include multiple connecting rods 213, Duo Gelian It is the reticular supporting structure substantially to assume diamond in shape that extension bar 213, which is interconnected and form cellular construction, and referring to Figure 11, showing proximal segment 130 is Reticular supporting structure.The reticular supporting structure does not use waveform bar 214, and uses substantially mutual in multiple connecting rods 213 of straight-bar Even, due to its cellular construction close, deformability is lower, thus have superior supportive, can make proximal segment 130 and/ Or the anchoring that distal ports 150 consolidate is in the blood vessel, so as to avoid bracket from being shifted by the diseased region discharged, improves long-term Therapeutic effect.

Embodiment 2

The present embodiment provides another iliac vein bracket, difference from Example 1 is, the present embodiment iliac vein branch The interlude 140 of frame uses 1 waveform bar 214, constitutes single-screw flexible tubular support construction, and connecting rod 213 connects waveform bar Adjacent part in 214.Referring to fig. 2, a waveform bar used by the present embodiment single coil configuration iliac vein bracket is shown 214 local expansion structure, wherein a1 and a2, b1 and b2, c1 and c2, d1 and d2, e1 and e2, f1 and f2, g1 and g2, h1 and h2 Breakpoint when being unfolded for waveform bar 214 is a wave coil structures of waveform bar 214, including several Z-shaped waves between a1 and b2, It similarly, is waveform between b1 and c2, between c1 and d2, between d1 and e2, between e1 and f2, between f1 and g2, between g1 and h2 Other multiple wave coil structures of bar 214, each breakpoint are sequentially connected the waveform bar 214 for constituting single coil configuration, with approximation circle The central axis of column helix spiral surrounding tubulose constitutes single-screw flexible tubular support construction.

Connecting rod 213 connects in waveform bar 214 along stent length direction adjacent peaks 211 or adjacent trough 212.

Embodiment 3

The present embodiment provides another iliac vein bracket, difference from Example 1 is, the present embodiment iliac vein branch The diameter of frame is gradually become smaller by proximate, referring to Fig. 1, Fig. 8 and Fig. 9.Correspondingly, the waveform bar 214 of iliac vein bracket is close Like the central axis of conical spiral spiral surrounding tubulose.The proximal segment 130 of bracket, distal ports 150 can use and interlude 140 similar helical structures can also use cellular construction as the reticular supporting structure that substantially assumes diamond in shape.

Referring to Figure 11, the proximal segment 130 of bracket and the structure of 140 transition connection portion of interlude point, proximal segment 130 are shown It is the reticular supporting structure substantially to assume diamond in shape to be interconnected and form cellular construction by several connecting rods 213, interlude 140 is two waves The combination of shape bar 214 constitutes double-spiral structure, and is gradually reduced from proximal segment 130 to the caliber of 140 bracket of interlude.Netted branch Support structure has superior supportive since its cellular construction is closed, can make proximal segment 130 it is firm be anchored on blood Guan Zhong improves long-term therapeutic effect so as to avoid bracket from being shifted by the diseased region discharged.The Diameter Gradual Change of bracket, The unequal truncated cone-shaped structure of both ends diameter is made it have, the vein of Diameter Gradual Change preferably can be adapted to and support in shape Blood vessel.

Embodiment 4

Similarly, reference implementation example 3 is further improved based on embodiment 2, make the diameter of 2 iliac vein bracket of embodiment by Proximate gradually becomes smaller, the central axis of the approximate conical spiral spiral surrounding tubulose of the waveform bar 214 of iliac vein bracket, Difference from Example 3 is that the present embodiment iliac vein bracket interlude constitutes single-screw flexible tubular support construction.

Embodiment 5

It by taking embodiment 3 as an example, proposes further to improve for the proximal port 110 of iliac vein bracket, proximal segment 130 is set End face be inclined-plane, the proximal port 110 of iliac vein bracket is inclined open, and the radial direction with tubular bracket is in angle, can be with blood Pipe matches in the nozzle of the oblique branch vessel of bifurcation, and referring to Figure 11, the reticular supporting structure of proximal segment 130 is in proximal port 110 is angularly disposed.

A kind of typical case of the present embodiment iliac vein bracket is used for iliac vein, referring to Fig. 7, Fig. 8, inferior caval vein 101 to It is lower to cross with the right iliac vein 103 of left iliac vein 102, since (z-axis direction in Fig. 8) is lumbosacral spine behind the iliac vein of left side, before For right side arteria iliaca communis, when left iliac vein 102 is oppressed by the front and back of above-mentioned anatomical structure, wall of vein is repeatedly subjected to compressing thorn Swash, leads to left 102 chronic injury of iliac vein, adhesion, lumen narrows.In most cases, left iliac vein 102 and inferior caval vein 101 Formed angle is greater than right iliac vein 103 and angle formed by inferior caval vein 101.

Fig. 1 shows the present embodiment iliac vein bracket in the non-nature by outer pressure, and the ilium under natural conditions is quiet Pulsation frame is in essentially straight, Diameter Gradual Change tubulose；Fig. 8 shows the present embodiment iliac vein bracket and is being implanted to a kind of dissection State in the iliac vein of structural deflection, the interlude 140 of iliac vein bracket is with the iliac vein blood vessel of flexure in the multiple sides of x, y, z To bending, with support blood vessels wall, restore iliac vein blood vessel in narrow preceding blood flow state or increase blood flow, this with shown in Fig. 7 Stenter to implant is different to a kind of form close to ideal anatomical structure iliac vein.Iliac vein bracket is placed into left iliac vein 102, The proximal end of bracket is wherein placed on left iliac vein 102 and 101 intersection of inferior caval vein, the proximal port 110 of iliac vein bracket is Slanting opening can match with left iliac vein 102 in the vein nozzle of aforementioned intersection, and mount proximal end part is avoided to stretch out To vein intersection, so as to avoid the secondary thrombus being likely to form.

Obviously, those skilled in the art know, in order to adapt to the vein blood vessel structure extremely bent, can pass through machining Or iliac vein bracket will be designed as bending or flexed configuration, example in the non-nature by outer pressure by the conventional means such as heat treatment Such as, iliac vein bracket can be designed as bending shape shown in Fig. 9 in the non-nature by outer pressure by those skilled in the art. It is unquestionable, regardless of bracket in the non-nature by outer pressure, the transportable performance of bracket intravascular should all be met, For example, shape-memory material, which can be used, manufactures aforementioned iliac vein bracket, compressibility is made it have, and can be spontaneous or through instrument (such as sacculus) expansion is restored to expansion or uncompressed form, provides the radial support power to blood vessel cavity wall, expands the lumen of blood vessel.

The utility model iliac vein bracket can be cut by metal wire knitted or tubing.Preferably tubing is made through cutting At the waveform bar 214 and connecting rod 213 of iliac vein bracket are integrated composition tubular structure.For example, using laser cutting shape note Recall alloy pipe to be made, marmem be optionally Nitinol, adnic, copper aluminum series alloy, copper Zn based alloy, Iron-based alloy etc., preferably with the Nitinol of good biocompatibility.

The utility model bracket tubular length can select as needed, a kind of optional embodiment, bracket tubular length For 60-120mm, more specifically, stent length is chosen as 60mm, 80mm, 100mm or 120mm.Also, the proximal segment of bracket, in Between section and distal ports along the length ratio of bracket tubulose length direction be optionally 2.5-3.5:4.5-5.5:1.5-2.5, preferably It is 3:5:2.

The diameter of the utility model mount proximal end mouth and far distance port can select as needed, a kind of optional embodiment, The diameter of proximal port is 10-18mm, and the diameter of far distance port is 10-14mm, and more specifically, mount proximal end mouth diameter is optionally 10mm, 12mm, 14mm, 16mm or 18mm, rack far end mouth diameter is optionally 10mm, 12mm or 14mm, for example, pressing bracket The classification of proximal port diameter-far distance port diameter (mm), can form following nine kinds of conical support specifications: 18-14,18-12,18-10, 16-14,16-12,16-10,14-12,14-10,12-10 and four kinds of straight tube specifications: 14-14,12-12,10-10.

Iliac vein bracket provided by the utility model is described in detail above, using specific in the utility model Example is expounded the embodiments of the present invention, and the above embodiments are only used to help understand, and this is practical new Type, it is noted that those of ordinary skill in the art, without departing from the principle of this utility model, may be used also Several improvement are carried out to the utility model, these improvement are also fallen into the protection scope of the utility model claims.

Claims (16)

1. a kind of iliac vein bracket, in a tubular form, the length direction along the tubulose includes proximal segment, interlude and distal ports, It is characterized in that, the interlude proximal segment and distal ports have bigger flexibility；

The interlude includes waveform bar and connecting rod, and the waveform bar is the multiple waveform configuration structures arranged along its length At the central axis of tubulose described in the waveform bar approximate helical line spiral surrounding constitutes flexible tubular support construction, the wave Shape bar be one or more, the waveform bar be two or more when constitute flexible tubular support construction include double helix or More helical structures；

The connecting rod be it is multiple, the length direction along the tubulose is fixedly connected with the phase in adjacent waveform bar or waveform bar respectively Adjacent part.

2. iliac vein bracket according to claim 1, it is characterised in that: the tubular length of the bracket is 60-120mm, Proximal segment, interlude and the distal ports of bracket are 2.5-3.5:4.5-5.5:1.5- along the length ratio of bracket tubulose length direction 2.5。

3. iliac vein bracket according to claim 2, it is characterised in that: proximal segment, interlude and the distal ports edge of bracket The length ratio of bracket tubulose length direction is 3:5:2.

4. iliac vein bracket according to claim 1, it is characterised in that: in the double helix or more helical structures, two Or more than two waveform bars are to arrange at equal intervals.

5. iliac vein bracket according to claim 1, it is characterised in that: the proximal segment and/or distal ports include waveform The tubular support structure that the central axis of tubulose described in bar approximate helical line spiral surrounding is constituted, the proximal segment and/or distal end Section waveform bar spiral density and/or waveform bar shank diameter be greater than the interlude waveform bar spiral density and/ Or the shank diameter of waveform bar.

6. iliac vein bracket described in any one of -5 according to claim 1, it is characterised in that: connecting rod connects flexible tubular The wave crest or trough of the adjacent wave of support construction length direction, and the connecting rod is spacedly distributed on pipe week.

7. iliac vein bracket according to claim 6, it is characterised in that: the wave is in Z-shaped wave structure.

8. iliac vein bracket according to claim 6, it is characterised in that: the interlude includes that connecting rod connection tubulose is long Spend the wave crest or trough of three adjacent waves of direction.

9. iliac vein bracket according to claim 6, it is characterised in that: the connecting rod is in straight-bar substantially.

10. iliac vein bracket according to claim 1, it is characterised in that: the proximal segment and/or distal ports include multiple It is the reticular supporting structure substantially to assume diamond in shape that connecting rod, which is interconnected and form cellular construction,.

11. the iliac vein bracket according to claim 5 or 10, it is characterised in that: the diameter of the iliac vein bracket is by close It holds to distally gradually becoming smaller, the central axis of tubulose described in waveform bar approximation conical spiral spiral surrounding.

12. iliac vein bracket according to claim 11, it is characterised in that: the diameter of the iliac vein mount proximal end mouth is 10-18mm, the diameter of far distance port are 10-14mm.

13. iliac vein bracket according to claim 11, it is characterised in that: the shank diameter of waveform bar be 0.1~ 0.4mm, the shank diameter of connecting rod are 0.1~0.3mm.

14. iliac vein bracket according to claim 1, it is characterised in that: the proximal segment end face of the iliac vein bracket is Inclined-plane, the proximal end inclined open of the iliac vein bracket can with blood vessel the oblique branch vessel of bifurcation nozzle phase Match.

15. iliac vein bracket according to claim 11, it is characterised in that: the iliac vein bracket is that tubing is made through cutting At the waveform bar and connecting rod of iliac vein bracket are integrated composition tubular structure.

16. iliac vein bracket according to claim 1, it is characterised in that: the iliac vein bracket interlude is non-by outer The nature of pressure is in bent tube form.