DE102007030753A1 - stent - Google Patents

Abstract

The invention relates to a stent having a tubular lattice structure (10), comprising circumferentially arranged webs (11e, 11f, 11g, 11h), wherein in the circumferential direction of the lattice structure (10) adjacent webs arranged by Endbögen (12a, 12b) and webs (11e, 11f, 11g, 11h) arranged in the longitudinal direction of the lattice structure (10) are coupled by connectors (13a, 13b, 13c). The invention is characterized in that the lattice structure (10) is adapted such that in the longitudinal direction of the lattice structure (10) adjacently arranged end curves (12a, 12b) in a compressed state of the lattice structure (10) aligned with each other and in an expanded state the lattice structure (10) are arranged offset from each other.

Description

The invention relates to a stent with a tubular lattice structure with the features of the preamble of claim 1. A stent of this kind is for example from the US 7,037,330 B1 known.

Of the known stent has a tubular lattice structure, which is made up of individual bars. The bars are on the perimeter arranged the grid structure, wherein in the circumferential direction of the grid structure immediately adjacent webs in each case by Endbögen or Tips are connected, reducing the shape of the stent in the circumferential direction is determined. The circumferentially connected by the end curves Webs are in some places in the longitudinal direction with each other coupled by connectors, whereby the elongated shape of the Stents is achieved.

at This lattice structure, the webs are arranged so that the end curves in the longitudinal direction of the stent downstream webs in the expanded state of the lattice structure immediately opposite are arranged. This leads to each being immediate collide opposite end sheets, when the stent enters a strongly curved vessel section is used. The flexibility of the known stent is thus severely limited. Moreover exists the risk of damaging the stent when it becomes one Collision between the end curves comes.

Around Here at least partially remedial, are the connectors formed of the known stent relatively long, so that a possible large distance between directly in the longitudinal direction is set opposite arranged end curves. Though this can increase the flexibility of the stent. Due to the long connector but the stability of the stent. In addition, the flexibility limit continue by the distance between immediately opposite arranged end curves determined or limited.

Of the Invention is based on the object, the flexibility to improve the stent of the type mentioned, wherein the stent also have good mechanical stability should.

According to the invention This object is achieved by a stent having the features of the claim 1 solved.

The Invention is based on the idea of a stent with a tubular Specify grid structure, which in a state with relatively smaller cross-sectional diameter and in a state of relatively larger cross-sectional diameter and / or vice versa and on the Having circumferentially arranged webs. Here are in the circumferential direction the lattice structure arranged webs through Endbögen and in the longitudinal direction of the grid structure arranged webs Coupled connector. The grid structure is adapted such that arranged adjacent in the longitudinal direction of the lattice structure End curves in the state with a relatively smaller cross-sectional diameter arranged in alignment and in the state with relatively larger Cross-sectional diameter are arranged offset.

The Invention has several advantages. By in the state with larger Cross-sectional diameter of the lattice structure offset from one another End bends, a collision of the end bends is avoided even if the stent is in blood vessels with strong Curvatures is used. Especially on the inside of vessel curvatures, where the radius of curvature is particularly small, is effectively avoided that longitudinally adjacent to the grid structure end sheets together bump and, for example, into the vessel volume in turn. Due to the staggered arrangement of the end curves The flexibility of the grid structure is not as before bounded by the geometry of the lattice structure, as the staggered End curves in the longitudinal direction of the stent substantially are free and movable without obstacles. The flexibility limit is therefore determined essentially by the material properties.

The in the state with a smaller cross-sectional diameter aligned with each other arranged end bows offer the advantage that the stent when released from a delivery system, such as a Catheter has good mechanical stability because the end curves support each other practically can. This reduces the risk that the stent is damaged during release or implantation.

All in all is the flexibility of the stent in the invention Condition with relatively larger cross-sectional diameter improved, without affecting the stability of the stent essential is impaired. In the state with a relatively smaller cross-sectional diameter if the stent according to the invention is mechanically stable, thereby achieving a safe handling of the stent during implantation becomes.

embodiments and structural details of the invention are in the subclaims specified.

In this case, a plurality of ribs arranged in rows in the circumferential direction of the grid structure can each form meshes which are arranged in the longitudinal direction of the grid structure and coupled by the connectors. This embodiment preferably forms a typical structure for mechanically stable and flexible stents. In a preferred embodiment, at least two webs of at least one mesh have different shapes and / or different material properties and cooperate with the stitches of the mesh such that end sheets disposed adjacent the longitudinal direction of the mesh structure are aligned in the relatively smaller cross-sectional diameter state and in the relatively low state larger cross-sectional diameter are arranged offset. This means that the relative change in position of the end sheets is caused by different shapes and / or material properties of the webs. Due to the different properties of at least two webs in cooperation with a connector, in particular an asymmetrical relative change in position of the end bends is achieved when the cross-sectional diameter of the grid structure is changed. In this case, the asymmetric change in position means that the end bends occupy different end positions in the two states, so that the end bows originally arranged in the state with a relatively smaller cross-sectional diameter occupy a different relative position in the state with a relatively larger cross-sectional diameter, ie are offset relative to one another.

A Reinforcement of this effect (different end positions) is achieved in that advantageously the webs with different Shapes and / or different material properties of the longitudinal direction Subordinate meshes form a pattern.

at In a preferred embodiment, the connectors couple in each case in the circumferential direction of the grid structure adjacent webs to a pair of webs, wherein the webs of the web pair different shapes and / or have different material properties. These Embodiment has the advantage that in each case for the desired relative change in position of the end curves responsible webs are assigned directly to a connector. This will a particularly effective, d. H. strong relative change in position Achieved so that it is in the state with relative Smaller cross-sectional diameter arranged directly opposite End curves in the state with relatively larger Cross-sectional diameter sufficiently far from each other or are offset in order to avoid collision with each other safely.

A further improvement of the desired effect is thereby achieved, if preferably the connectors each two in the longitudinal direction couple the web structure adjacently arranged web pairs, wherein the two pairs of bars each have bars with different shapes and / or have different material properties. there The webs of the two pairs of bars can be arranged mirror-inverted be.

The different forms of the respective webs or the webs of respective pair of webs can be realized thereby, that the webs have different lengths. This is a particularly simple constructive measure that production technology is well feasible to the desired change in position between the different diameter conditions to reach.

at Another preferred embodiment couple the Each two adjacent connector in the circumferential direction of the grid structure arranged web pairs, wherein the two pairs of webs each webs with different shapes and / or different material properties exhibit. Also by this constructive measure is achieved that at the transition from the relatively smaller cross-sectional diameter on the relatively larger cross-sectional diameter and / or vice versa forces on the grid structure in particular in the area of the connectors act in such a way that the end curves in the circumferential direction of the lattice structure a change in position experienced, to the desired different end positions (in alignment). The connectors can in each case the two pairs of webs arranged adjacent in the circumferential direction arranged with corresponding mirror-inverted in the longitudinal direction Link pairs of webs, causing the change in position of the. end arcs is reinforced. Also in this embodiment It is particularly advantageous if the two webs of the web pairs have a different length than the two webs of the other pair of webs.

at another particularly preferred embodiment a plurality of pairs of bars provided between two connectors, wherein a Bridge pair with different shapes and / or different Material properties as the other pairs of bars centered is arranged between the connectors. Also with this variant becomes the desired change in position of the end sheets safely reached. In this case, a longitudinal direction of the lattice structure Subsequent mesh have axially symmetrically arranged web pairs such that in each case the web pairs with the same shapes and / or same material properties in the compressed state in alignment or are arranged directly opposite.

at an alternative embodiment, by the End bows connected webs a straight bridge and a curved bridge on. This will be for the Change of position of end curves required different realized geometric shapes. The connectors can each be arranged obliquely relative to the straight webs.

at In another embodiment, the webs and connectors employed with respect to the longitudinal axis of the lattice structure. The employee arrangement of the webs and connectors can with the above said embodiments are combined.

at Another embodiment is the end sheets between two connectors on a curved locus arranged. The end curves between two in the circumferential direction of the grid structure downstream connectors be arranged on an oppositely curved locus. The end bends of longitudinally the lattice structure downstream meshes can be curved out of phase Loci be arranged. Overall, by the above mentioned variants of this embodiment, a wave-like Course of the end curves of a mesh achieved, in turn to the desired relative change in position of End curves leads.

Further may be at least one axial end of the stent at least one X-ray marker to be connected to a pair of bridges. In essence, can while a the web pair facing side of the X-ray marker be formed planar. The combination of the stent with a radiopaque Material allows implantation and positional control of the Stens during and after the operation by means of imaging X-ray diagnostics.

Preferably the stent is higher in the axial end regions Number of connectors than in the middle region between the axial End areas on. In this case, the axial end regions comprise at least a stitch, in particular two stitches. In this way, the Stability in the axial end areas improved and the Increased dimensional stability of the entire stent. The flexibility of the stent, especially in the middle region of the stent remains however, so that the stent is also in blood vessels can be used with relatively small radii of curvature.

following the invention is based on embodiments below With reference to the accompanying schematic drawings further details explained.

In show this

1 a plan view of a stent according to a first embodiment in the state of relatively smaller cross-sectional diameter;

2 a plan view of a stent according to a second embodiment in the state of relatively smaller cross-sectional diameter;

3 a plan view of a stent according to a third embodiment in the state of relatively smaller cross-sectional diameter;

4 a plan view of a stent according to a fourth embodiment in the state of relatively smaller cross-sectional diameter; and

5 a plan view of a stent according to one of 1 to 4 in the state with a relatively larger cross-sectional diameter.

1 shows the grid structure 10 a stent in unwound representation. It is understood that the lattice structure 10 is tubular in practice. The in 1 shown stent is particularly suitable for the neurovascular area, but can also be used in other fields.

For the stent according to 1 it is an expandable stent with a lattice structure 10 which is convertible from a relatively smaller cross-sectional diameter state to a relatively larger cross-sectional diameter state. The relatively larger cross-sectional diameter in the lattice structure 10 occurs when the stent expands or expands. The relatively smaller cross-sectional diameter relates to a cross-sectional diameter which is smaller than the cross-sectional diameter in the expanded state (relatively larger cross-sectional diameter). In this case, the relatively small cross-sectional diameter of the lattice structure 10 both the stent in the compressed and in the laser-cut state. In the compressed state, the webs of the lattice structure 10 and the stent forms a virtually closed surface so that the stent can be inserted into a patient's body during surgery by means of a catheter. In the laser-cut state, the cross-sectional diameter is slightly larger than in the compressed state, the webs, although closely spaced, compared to the expanded state, but not directly adjacent to each other.

The 1 to 4 show embodiments of the invention stents for reasons of clarity in the laser cut state. The features and functions described in connection with the laser cut state are transferable to the compressed state (not shown) and are also disclosed in the context of the compressed state.

The grid structure 10 is adapted to be converted from the compressed or laser-cut state to the expanded state. For this purpose, the stent can be made as a self-expanding stent made of a shape memory material. Alternatively, the stent may be mechanical, at For example, be expanded with the help of a balloon catheter.

The stent according to 1 based on the principle, the lattice structure 10 to be adapted so that in the longitudinal direction LR of the lattice structure adjacent arranged end curves 12a . 12b at the transition from the compressed to the expanded state and vice versa perform a predetermined relative change in position to each other. The change in position is due to the end positions of the end curves 12a . 12b determined, with the end curves 12a . 12b are arranged in alignment in the compressed state, as in 1 shown. The aligned arrangement of the longitudinal direction LR of the lattice structure 10 adjacent arranged end curves 12a . 12b means that the end bows 12a . 12b are arranged directly opposite. In particular, the end bows 12a . 12b each arranged on an imaginary line, which is substantially perpendicular through the apex of the two end curves 12a . 12b runs. The imaginary line is in 1 denoted by L and shown dotted.

This ensures that the stent when released from a catheter has a good mechanical stability, since the longitudinally adjacent the lattice structure arranged end curves 12a . 12b can support each other practically. It should be noted that the end curves 12a . 12b are arranged in the compressed state closer than in the laser cut state according to 1 but that clearly illustrates the principle of the invention.

The adjacent arrangement of elements, in particular webs, end curves or connectors generally means that these elements are in the circumferential direction UR or longitudinally LR immediately below are.

In 5 is the stent according to 1 shown in the expanded state. It is easy to see that in the compressed state aligned Endbögen 12a . 12b offset in the expanded state are arranged to each other.

In the expansion of the lattice structure 10 become the end bows 12a . 12b moved in the circumferential direction so that a relative change in position between the Endbögen 12a . 12b established. Due to the relative change in position is achieved that in the compressed state aligned Endbögen 12a . 12b are arranged offset in the expanded state, as in 5 clearly visible. The staggered arrangement of the end curves 12a . 12b in the expanded state significantly increases the flexibility of the stent, since the end bows 12a . 12b spaced sufficiently far apart to safely avoid a collision thereof. In this way, the stent according to 1 also be used without problems for the treatment of highly curved vessel sections, since the stent can also be adapted to small inner radii of the vessel curvature.

The circumferential UR of the lattice structure 10 caused relative change in position between adjacent in the longitudinal direction LR end curves 12a . 12b can be achieved by various design measures.

A particularly preferred stent construction will be described with reference to the first embodiment 1 shown.

The tubular lattice structure 10 according to 1 has a variety of bars 11 on that on the perimeter of the lattice structure 10 are arranged. In the circumferential direction UR of the lattice structure 10 adjacently arranged webs 11a . 11b each by an end-bow 12a . 12b connected. In the longitudinal direction of the lattice structure 10 adjacently arranged webs 11a . 11b and 11c . 11d are through connectors 13a . 13b . 13c coupled.

Several form in the circumferential direction UR of the lattice structure 10 rows of bars arranged in rows 11a . 11b or webs 11c . 11d each mesh 14a . 14b . 14c (loops) in the form of annular peripheral portions in the longitudinal direction LR of the lattice structure 10 arranged and through the connectors 13a are coupled.

In this case, for example, ten stitches can be arranged in the longitudinal direction LR, wherein in each case two adjacent stitches 14a . 14b through three connectors 13a . 13b . 13c are connected. Another number of stitches or number of connectors is of course possible.

As in 1 A connector is easy to recognize 13a . 13b . 13c two in the circumferential direction of the lattice structure 10 adjacently arranged webs 11a . 11b to a first pair of bridges 15a , In this case, the webs 11a . 11b of the first bridge pair 15a different geometric shapes. In particular, the first jetty 11a shorter than the circumferentially adjacent UR and with the connector 13a coupled second bridge 11b ,

As further in 1 to recognize the connector couples 13a the first pair of bridges 15a with a second bridge pair 15b , where the two pairs of bars 15a . 15b each of the bars 11a . 11b . 11c . 11d having different geometric shapes. This includes the first pair of bridges 15a first and second bridges 11a . 11b and the second pair of bridges 15b third and fourth bridges 11c . 11d , wherein the first and second webs 11a . 11b are different in length and the third and fourth bridges 11c . 11d are different lengths. The two pairs of bridges 15a . 15b thus have different lengths.

The bridges 11a . 11b . 11c . 11d the two bridge pairs 15a . 15b are arranged mirror-inverted. This means that each two equally long bars, so the first and fourth bridge 11a . 11d and the second and third jetty 11b . 11c through the connector 13a connected diagonally.

The above-described arrangement of the two web pairs 15a . 15b is with all connectors 13a . 13b . 13c the lattice structure 10 realized.

As further in 1 shown, couple the connectors 13a . 13b . 13c two each in the circumferential direction UR of the lattice structure 10 adjacent third and fourth pairs of bars 16a . 16b , This shows one of the two pairs of webs 16a . 16b , in particular the third bridge pair 16a two adjacent bars 11e . 11f which are shorter than the two adjacent bridges 11h . 11g of the other (fourth) bridge pair 16b , Due to the different lengths of the webs 11e . 11f respectively. 11h . 11g the two adjacently arranged in the circumferential direction web pairs 16a . 16b are the associated end curves 12a . 12b arranged offset in the longitudinal direction LR. The third pair of bridges 16a is therefore shorter than the circumferentially UR adjacent arranged fourth pair of webs 16b , each through a connector 13a connected to each other.

The corresponding connector 13a couples the two circumferentially arranged third and fourth pairs of webs 16a . 16b with fifth and sixth pairs of webs arranged parallel thereto in the circumferential direction 17a . 17b , The parallel web pairs 16a . 16b and 17a . 17b are adjacent in the longitudinal direction LR and mirror-inverted to each other, ie the short third pair of webs 16a is opposite the long fifth pair of bridges 17a , and the long fourth pair of bridges 18b is opposite the short sixth pair of bridges 17b arranged.

Between two downstream in the circumferential direction UR connectors 13a . 13b respectively. 13b . 13c are several pairs of bridges 16a . 16b . 16d . 16e , in particular five pairs of bars 16a . 16b . 16c . 16d . 16e arranged. A different number of pairs of bridges is possible. Again, the principle of different geometric shapes is realized, the pair of webs 16c shorter than the other pairs of bars 16a . 16b . 16d . 16e is, midway between the two connectors 13b . 13c is arranged. Further, two are disposed adjacent to each other in the longitudinal direction LR and through the connectors 13a . 13b . 13c connected stitches 14a . 14b designed so that in each case the same pair of webs 16a . 17a . 16b . 17b . 16c . 17c . 16d . 17d . 16e . 17e , ie the same distance pairs of webs are arranged. The bridge pairs 17a . 17b . 17c . 17d . 17e the second stitch 14b are thus axisymmetric to the web pairs 16a . 16b . 16c . 16d . 16e the first stitch 14a trained and arranged.

The axisymmetric arrangement of the respective web pairs 16a . 17a . 16b . 17b . 16c . 17c . 16d . 17d . 16e . 17e two adjacent longitudinally LR arranged mesh 14a . 14b is on the entire grid structure 10 applied. Here are the connectors 13a . 13b . 13c each subordinate mesh 14a . 14b . 14c arranged offset in the circumferential direction UR and in each case by the width of a web pair 16a . 16b ,

This results in a total of a pattern of short and long pairs of bridges 16a . 16b spread over the surface of the grid structure 10 , the overall to a uniform as possible offset of the end curves 12a . 12b in the expanded state leads.

The embodiment according to 1 is particularly advantageous in terms of ease of manufacture and allows a secure and sufficiently strong relative change in position of the end sheets 12a . 12b , In addition to the structural measures taken with regard to the different lengths of web pairs 15a . 15b respectively. 16a . 16b respectively. 17a . 17b are other design measures possible, which also to the desired change in position of the end curves 12a . 12b at the transition from the compressed to the expanded state.

It is thus possible, for example, as per the second exemplary embodiment according to FIG 2 shown, pairs of bars 15c form, with the two webs 11i . 11k each of a pair of bridges 15c straight and curved. This results in a configuration of the grid structure 10 , each with a straight bridge 11k with a curved bridge 11i through an end-bow 12a . 12b connected is.

The connectors 13a . 13b . 13c of the stent according to 2 are arranged inclined relative to the longitudinal axis or longitudinal direction LR. In this case, the inclination angle with respect to the longitudinal direction LR is selected so that the longitudinal extent of the connector 13a . 13b . 13c approximately parallel to the curved webs 11i runs. Generally, the connectors are 13a . 13b . 13c are made substantially in the same direction with respect to the longitudinal direction LR as the curved webs 11i ,

In the third embodiment according to 3 are both the connectors 13a . 13b . 13c as well as the footbridges 11l . 11m arranged inclined with respect to the longitudinal direction LR. At the grid structure 10 according to 3 show the bars 11l . 11m different geometric properties. in particular special is the jetty 11m a bit shorter than the jetty 11c , whereby the desired offset of the end sheets is achieved in the expanded state.

In the fourth embodiment according to 4 point that through the end bows 12a . 12b certain mesh edges or in the circumferential direction UR extended mesh edges each of a mesh 14a . 14b . 14c different gradients. They are between two connectors 13a . 13b provided end curves 12a . 12b arranged on a curved locus O '. This is achieved in that the length of the web pairs downstream in the circumferential direction UR changes in accordance with the locus O '. In this case, the adjoining stitch edges or stitch edges are two stitches arranged downstream in the longitudinal direction LR 14a . 14b adjusted so that the slope changes in parallel.

Furthermore, the end bows 12a . 12b between two in the circumferential direction UR of the lattice structure 10 downstream connectors 13a . 13b . 13c each arranged on oppositely curved loci O ', O'', so that in total results in a wave-shaped mesh edge.

The end bows 12a . 12b of meshes downstream of the lattice structure in the longitudinal direction LR 14a . 14b . 14c are arranged on phase-shifted curved loci OI, OII. This is achieved by connecting the connectors 13a . 13b , which each form the end points of a locus portion, are arranged offset in the circumferential direction UR. The offset can be the width of two pairs of webs.

In the embodiments described above according to the 1 to 4 is the relative change in position of the end curves 12a . 12b achieved by differently geometrically designed webs or web pairs. Alternatively, it is also possible to use webs or pairs of webs with different material properties instead of the geometric differences, which effect a change in the stitch movement in the circumferential direction. For example, by selective heat treatment by means of laser radiation, individual webs or web pairs can be changed with regard to the bending behavior, so that areas with different material properties can be set on the circumference of the grid structure, which leads to the desired offset of the end bends.

General is the lattice structure 10 adapted so that, in a change in cross section, the circumferential position of the meshes immediately adjacent in the longitudinal direction 14a . 14b . 14c relative to each other changes. As a result, an offset of the aligned in the compressed state Endbögen 12a . 12b the adjacent mesh 14a . 14b achieved over the entire circumference of the grid structure 10 ,

As in 1 As shown, the stent has a plurality of x-ray markers at at least one axial end 18 , in particular in each case three x-ray markers 18 at each axial end. Another number of x-ray markers is possible. Each x-ray marker 18 is with a bridge pair 15a connected and thus replaces an end-bow. It is the bridge pair 15a facing side 19 of the X-ray marker 18 formed substantially planar. That means that the bridge pair 15a facing side 19 of the X-ray marker 18 is formed substantially parallel to the peripheral edge of the stent at its axial end. As a result, a planar contact surface for the end curves of the circumferential direction UR adjacent to the respective X-ray marker 18 arranged web pairs formed, which are thus in the compressed state of the stent on the X-ray marker 18 can support. This will increase the stability of the stent, especially in the area of the x-ray marker 18 improved.

Furthermore, in a further embodiment (not shown) in the axial end regions, a higher number of connectors 13a . 13b . 13c be provided as in the middle region of the stent. In particular, six connectors each are in the axial end regions 13a . 13b . 13c per stitch 14a . 14b . 14c or generally 4 - 8th Connector and in the middle stent area three connectors 13a . 13b . 13c per stitch 14a . 14b . 14c intended. The increased number of connectors 13a . 13b . 13c requires a higher stability of the stent, especially in the end regions. At the same time, however, the stent remains flexible, especially in the middle region between the end regions, and is furthermore suitable for implantation in vessels with narrow radii of curvature. The axial end regions can be one or more stitches 14a . 14b . 14c , in particular two stitches 14a . 14b , wherein the middle stent area has at least as many stitches 14a . 14b . 14c includes.

10

lattice structure

11a-11m

Stege

11k

straight web

11i

curved web

12a, 12b

end arcs

13a, 13b, 13c

Interconnects

14a, 14b, 14c

mesh

15a, 15b

gutter pairs (adjacent longitudinally)

16a, 16b, 16c, 16d, 16e

gutter pairs (adjacent in the circumferential direction)

17a, 17b, 17c, 17d, 17e

gutter pairs (adjacent in the circumferential direction)

18

X-ray markers

19

planar page

O', O''

loci

OI, OII

phase-shifted loci

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 7037330 B1 [0001]

Claims (21)

Stent with a tubular grid structure ( 10 ) convertible to a relatively smaller cross-sectional diameter state and a relatively larger cross-sectional diameter state, and / or vice versa, comprising circumferentially disposed lands (US Pat. 11 ), wherein in the circumferential direction of the grid structure ( 10 ) arranged webs ( 11a . 11b ) by end curves ( 12a . 12b ) and in the longitudinal direction of the grid structure ( 10 ) arranged webs ( 11 ) by connectors ( 13a . 13b . 13c ), characterized in that the grid structure ( 10 ) is adapted such that in the longitudinal direction of the grid structure ( 10 ) adjacent Endbögen ( 12a . 12b ) are arranged in alignment with a relatively smaller cross-sectional diameter and arranged staggered in the state with a relatively larger cross-sectional diameter. Stent according to claim 1, characterized in that several in the circumferential direction of the lattice structure ( 10 ) arranged in rows webs ( 11 ) each mesh ( 14a . 14b . 14c ) formed in the longitudinal direction of the lattice structure ( 10 ) and through the connectors ( 13a . 13b . 13c ) are coupled. Stent according to claim 2, characterized in that at least two webs ( 11 ) at least one mesh ( 14a . 14b . 14c ) have different shapes and / or different material properties and thus with the connectors ( 13a . 13b . 13c ) the mesh ( 14a . 14b . 14c ) that in the longitudinal direction of the lattice structure ( 10 ) adjacent Endbö conditions ( 12a . 12b ) are arranged in alignment with a relatively smaller cross-sectional diameter and arranged staggered in the state with a relatively larger cross-sectional diameter. Stent according to claim 2 or 3, characterized in that the webs ( 11 ) with different shapes and / or different material properties of the longitudinally downstream stitches ( 14a . 14b . 14c ) form a pattern. Stent according to at least one of claims 1 to 4, characterized in that the connectors ( 13a . 13b . 13c ) in each case in the circumferential direction of the lattice structure ( 10 ) adjacent webs ( 11a . 11b ) to a pair of bars ( 15a ), the webs ( 11a . 11b ) of the web pair ( 15a ) have different shapes and / or material properties. Stent according to at least one of claims 1 to 5, characterized in that the connectors ( 13a . 13b . 13c ) two each in the longitudinal direction of the grid structure ( 10 ) adjacently arranged web pairs ( 15a . 15b ), wherein the two web pairs ( 15a . 15b ) each webs ( 11a . 11b . 11c . 11d ) having different shapes and / or different material properties. Stent according to claim 6, characterized in that the webs ( 11a . 11b . 11c . 11d ) of the two web pairs ( 15a . 15b ) are arranged mirror-inverted. Stent according to at least one of claims 1 to 7, characterized in that the webs ( 11a . 11b . 11c . 11d ), in particular the webs of the web pair ( 15a . 15b ), at least partially have different lengths. Stent according to at least one of claims 1 to 8, in particular according to one of claims 5 to 8, characterized in that the connectors ( 13a . 13b . 13c ) each two in the circumferential direction of the grid structure ( 10 ) adjacently arranged web pairs ( 16a . 16b ), wherein the two web pairs ( 16a ; 16b ) each have webs with different shapes and / or different material properties. Stent according to claim 9, characterized in that the connectors ( 13a . 13b . 13c ) each of the two circumferentially adjacent web pairs ( 16a . 16b ) with different longitudinally mirror-inverted pairs of webs ( 17a . 17b ) couple. Stent according to claim 9 or 10, characterized in that the two webs ( 11e . 11f . 11g . 11h ) each one of the pairs of bars ( 16a . 16b ) have a different length than the two webs of the other web pair ( 17a . 17b ). Stent according to at least one of claims 2 to 11, characterized in that a plurality of pairs of bars ( 16a . 16b . 16c . 16d . 16e ) between two connectors ( 13a . 13b . 13c ), wherein a pair of webs ( 16c ) with different shapes and / or different material properties in the middle between the connectors ( 13a . 13b . 13c ) is arranged. Stent according to claim 12, characterized in that a longitudinal direction of the lattice structure ( 10 ) downstream mesh axis symmetrically arranged web pairs ( 17a . 17b . 17c . 17d . 17e ) such that the pair of webs ( 16a . 16b . 16c . 16d . 16e . 17a . 17b . 17c . 17d . 17e ) are arranged with the same shapes and / or same material properties in the state with a relatively smaller cross-sectional diameter opposite. Stent according to at least one of claims 1 to 13, characterized in that the end bows ( 12a . 12b ) connected webs each have a straight web ( 11k ) and a curved web ( 11i ) exhibit. Stent according to claim 14, characterized in that the connectors ( 13a . 13b . 13c ) in each case based on the straight webs ( 11k ) are arranged obliquely. Stent according to at least one of claims 1 to 15, characterized in that the webs ( 11c . 11k ) and connectors ( 13a . 13b . 13c ) relative to the longitudinal axis of the lattice structure ( 10 ) are employed. Stent according to at least one of claims 1 to 16, characterized in that the end bows ( 12a . 12b ) between two connectors ( 13a . 13b . 13c ) are arranged on a curved locus O '. Stent according to claim 17, characterized in that the end bows ( 12a . 12b ) between two in the circumferential direction of the lattice structure ( 10 ) downstream connectors ( 13a . 13b . 13c ) are arranged on an oppositely curved locus O ''. Stent according to claim 17 or 18, characterized in that the end bows ( 12a . 12b ) of in the longitudinal direction of the grid structure ( 10 ) downstream meshes ( 14a . 14b . 14c ) are arranged on phase-shifted curved loci OI, OII. Stent according to at least one of claims 1 to 19, characterized in that at least one axial end of the stent has at least one X-ray marker ( 18 ) with a pair of bars ( 15a ), wherein one of the web pair ( 15a ) facing side ( 19 ) of the X-ray marker ( 18 ) is formed substantially planar. Stent according to at least one of claims 1 to 20, characterized in that the stent in the axial end regions has a higher number of connectors ( 13a . 13b . 13c ) than in the middle region of the stent between the axial end areas, wherein the axial end portions at least one mesh ( 14a ), in particular two meshes ( 14a . 14b ).