WO2012003963A1

WO2012003963A1 - Medical device and method for producing such a medical device

Info

Publication number: WO2012003963A1
Application number: PCT/EP2011/003332
Authority: WO
Inventors: Frank Nagl; Giorgio Cattaneo
Original assignee: Acandis Gmbh & Co. Kg
Priority date: 2010-07-05
Filing date: 2011-07-05
Publication date: 2012-01-12
Also published as: DE102010026088A1

Abstract

The invention relates to a medical device for intravascular applications in living bodies, comprising a lattice structure (10), which can be compressed and expanded and has at least two longitudinal edges (11, 12), which are connected to each other in such a way that the lattice structure (10) has a three-dimensional shape. The invention is characterized in that the lattice structure (10) has at least one joint (20) for attaching the longitudinal edges (11, 12), wherein said joint has at least one first joining element (21), which is connected to a first longitudinal edge (11) and engages in a second joining element (22) of the joint (20), wherein said second joining element is connected to a second longitudinal edge (12). The first joining element (21) has a double-sided profile, which is oriented in opposite first and second directions (I, II), and a stop (24), which is oriented in a third direction (III). The second joining element (22) surrounds the double-sided profile (23) in opposite directions (I, II) on one side and, on the other side, reaches behind the double-sided profile (23) in the third direction (III) on the side (25) of the first joining element (21) facing away from the stop (24) in such a way that the joint (20) forms an undercut (26), which attaches the longitudinal edges (11, 12) in opposite longitudinal directions (LR1, LR2) and in opposite circumferential directions (UR1, UR2) of the lattice structure (10). The invention further relates to a method for producing such a medical device.

Description

Medical device and method for producing such

medical device

description

The invention relates to a medical device according to the preamble of patent claim 1. Furthermore, the invention relates to a method for producing such a medical device. A medical device of the aforementioned type is known, for example, from EP 0 709 067 A2.

EP 0709 067 A2 describes a stent with a lattice structure, wherein the stent has two longitudinal edges, which are firmly connected to one another for the spatial shaping of the stent. The starting material for the known stent is a flat grid structure comprising a first rectilinear longitudinal edge and a second longitudinal edge, the second longitudinal edge having T-shaped projections. To produce the cylindrical shape of the stent, the flat grid structure is rolled about a longitudinal axis oriented parallel to the longitudinal edges such that the T-shaped extensions of the second longitudinal edge overlap the rectilinear first longitudinal edge. The first longitudinal edge overlapping projections of the second longitudinal edge are welded to the first longitudinal edge.

The known stent or generally the known medical device has the disadvantage that the wall thickness of the stent in the region of the connection points, in particular in the region of the overlap between the first and the second longitudinal edge, is increased. Thus, the known stent in the circumferential direction

different wall thicknesses, which has a negative effect on the uniform expansion of the stent. In use, the joints at the longitudinal edges of the stent are in particular forces in the longitudinal axial direction, as well as in

Circumference exposed. In the known stent, these forces

absorbed only by the welding points, which are thus subject to increased stress. Therefore, a particularly accurate production of the welded joint is required in the known stent, whereby the cost of the manufacturing process is increased. The invention is based on the object to provide a medical device that is simple and safe to produce and shows a uniform expansion behavior. It is another object of the invention to provide a method for producing such a medical device.

According to the invention this object is achieved with respect to the device by the subject-matter of claims 1 and 10 and with regard to the method by the subject-matter of claim 14.

The invention is based on the idea of a medical device for

Indicate intravascular applications in the living body with a lattice structure that is compressible and expandable and has at least two longitudinal edges that are interconnected such that the lattice structure has a spatial shape. The grid structure has at least one joint for fixing the

Longitudinal edges with at least one first joining element, which is connected to a first longitudinal edge. The first joining element engages in a second joining element of the joint, which is connected to a second longitudinal edge. The first

Joining member further includes a double-sided profile oriented in opposite first and second directions and a stop oriented in a third direction. On the one hand, the second joining element surrounds the double-sided profile in opposite directions. On the other hand, the second joining element engages behind the double-sided profile in the third direction on a side of the first joining element facing away from the stop such that the joint forms an undercut. The undercut fixes the longitudinal edges in opposite longitudinal directions and in opposite circumferential directions of the lattice structure.

The advantage of the invention is that the wall thickness of the lattice structure is maintained unchanged by the joint, which is formed by the intermeshing of the first joining element and the second joining element. This means that the medical device according to the invention has essentially a uniform wall thickness. The joint further forms an undercut which fixes the interconnected longitudinal edges of the grid structure both in the longitudinal direction, in particular the longitudinal axial direction, and in the circumferential direction. The im

Use of the medical device occurring longitudinal and circumferential forces are thus absorbed by the positive connection of the longitudinal edges of the grid structure. This contributes positively to the stability of the lattice structure. The first joining element, which is associated with the first longitudinal edge, has a double-sided profile whose sides are oriented in opposite directions. A third side of the first joining element may form the stop, wherein the third side is oriented in a different direction than the two sides of the double-sided profile. Overall, the first joining element has three sides, which are in engagement with the second joining element, so that a positive fixing of the two longitudinal edges in the longitudinal and circumferential direction is achieved. The three sides can each have different geometries. In particular, the sides may each have a straight, curved or angled shape.

The second joining element preferably has a shape complementary to the first joining element, so that there is a closed joint.

In particular, the second joining element may form a negative mold of the geometry of the first joining element. In this way, a firm fixation of

Longitudinal edges of the grid structure in the longitudinal and circumferential direction achieved. A game between the longitudinal edges of the grid structure is thus avoided.

The design of the joints according to the invention simplifies the production of the medical device, since the positive connection between the first joining element and the second joining element quickly achieves a longitudinal axial positioning around the circumferential positioning and fixing of the longitudinal edges of the lattice structure. An elaborate alignment of the longitudinal edges of the grid structure to each other is avoided.

In a preferred embodiment of the medical device, the joint is symmetrical. In particular, the joint may be symmetrical with respect to a circumferential line of the lattice structure. This means that the symmetry axis of the joint runs parallel to a circumferential line of the lattice structure. Alternatively, the joint may be symmetrical with respect to the longitudinal direction of the lattice structure, the axis of symmetry being parallel to the longitudinal axis of the lattice structure. The symmetry of the joint facilitates the joining process and causes a uniform introduction of force into the joint.

The double-sided profile of the first joining element may comprise two oppositely pointing lugs, between which the stopper is arranged. The noses pointing in opposite directions form the first and the second second side of the first joining element. The third side of the joining element is formed by the stop which extends between the two lugs. Overall, the first joining element may have a T-shaped structure. Such a structure is particularly suitable for forming an undercut, wherein the second joining element engages around and engages in the opposite directions of the nose and simultaneously abuts against the stop. At least one nose can form a snap closure with the second joining element.

The stop of the first joining element can be rectilinear, angled or curved. A straight stop is particularly easy to produce and has advantages in terms of receiving forces acting at right angles to the stop. In order to also absorb transverse forces, can be advantageously provided to form the stop curved or angled. In this way, further, a centering of the first joining element in the second joining element can be achieved.

Preferably, the two joining elements are connected by at least one welding point, which is arranged on the stop. Alternatively or additionally, the two joining elements may be connected by at least two welding points, which are arranged on the side facing away from the stop of the first joining element on both sides of the stopper. Due to the welding points in addition to

existing fixation of the joint in the longitudinal direction and in the circumferential direction reaches a fixation of the joint in the radial direction. The positive connection of the two joining elements in the region of the joint ensures that the position of the longitudinal edges of the lattice structure during manufacture are aligned correctly with one another. The at least one spot weld on the stop or the at least two spot welds on the sides of the joining element facing away from the stop permanently fix the relative position of the longitudinal edges of the grid structure to one another. Due to the special geometry of the joint, the joining process and fixing process, in particular the welding of the longitudinal edges of the lattice structure, is facilitated. The special geometry of the joint, in particular the undercut formed by the joint, causes a prefixing of the longitudinal edges of the lattice structure, which facilitates the final, firm connection of the longitudinal edges by setting one or more welding points. Since the position of the longitudinal edges to each other by the geometry of the joint is already fixed in the longitudinal direction and the circumferential direction, the requirements for the accuracy of the welding points are further reduced, whereby the manufacturing process can be accelerated can. Moreover, the longitudinal and circumferential forces occurring in use are absorbed by the joint, so that the welding points absorb only radial forces. The stability of the lattice structure is thus increased.

In a preferred embodiment of the medical device, the two joining elements are each connected to at least two webs of the lattice structure. The joint further forms a node of the lattice structure. The connection of the joining elements, each with two webs of the lattice structure, increases the stability of the joining elements, in particular in the radial direction of the lattice structure. The inclination of the joining element to dodge in the radial direction during the joining process is thus reduced. In the assembled state, the joint is therefore connected to at least four webs whereby the stability of the joint is increased. The joint forms a node of the lattice structure. This has the advantage that the webs of the grid structure are kept free and retain their original flexibility. It is thus achieved that substantially uniformly flexible webs are formed over the entire circumference of the lattice structure. In particular, a geometrical change of individual webs of the lattice structure is avoided by the formation of the joint as a node of the lattice structure. All webs of the lattice structure can therefore have the same geometry, so that a uniform expansion behavior of the lattice structure is achieved.

Alternatively, the first joining element can be formed by a right-angled top view of a web with a parallel first and second side surface and a front face perpendicular thereto. The first joining element engages in the second joining element at an angle relative to the longitudinal axis of the lattice structure. The double-sided profile is formed on the one hand by the first side surface and on the other hand by the combination of the end face and the second side surface. The stopper is further formed by the combination of the first side surface and the end surface.

According to a further alternative embodiment, it is provided that two separate first joining elements are respectively arranged at the end of a web. The web ends are curved in different directions. In this case, the two first joining elements together with a second joining element form a node of the lattice structure. In a further preferred embodiment, it is advantageously provided that the double-sided profile is designed differently such that, to facilitate the joining, one profile side is designed longer than the other profile side. During the joining process, the longer profile side may have a prefixing or centering function. The shorter profile side can be designed such that the further joint connection is effected by snapping the shorter profile side into the second joining element. In this way, in particular a funnel-shaped rolling up of the lattice structure to form the spatial shape can be facilitated.

According to a secondary aspect, the invention is based, a

medical device for intravascular applications in the living body with a lattice structure that is compressible and expandable and has two longitudinal edges that are interconnected such that the lattice structure has a spatial shape. The lattice structure has a plurality of joints for fixing the longitudinal edges, each having at least one first joining element, which is connected to a first longitudinal edge. The first joining element engages in a second joining element of the joint, which is connected to a second longitudinal edge. The first and second joining elements are arranged in the unwound state of the grid structure at least in sections on a line which is inclined relative to the transverse edges of the grid structure. Alternatively or additionally, in the unwound state of the lattice structure, the first and second joining elements are complementarily offset over the first and second longitudinal edges such that adjacently arranged joints are alternately offset in the circumferential direction in the rolled-up state of the lattice structure.

The invention is based on the idea of spatially distributing the joints of the lattice structure over the circumference of the lattice structure in order to ensure a uniform expandability of the lattice structure. Especially in the case of very small lattice structures, the joints form due to the production-related limitation of their

Degree of miniaturization inhomogeneities in the lattice structure. Due to the spatial distribution of inhomogeneities is achieved that the expandability or

Flexibility of the grid structure is evenly influenced by the inhomogeneities or joints. Overall, this results in a uniform distribution of inhomogeneities and thus a uniformly expandable lattice structure. This is achieved concretely in that the first and second joining elements in the

unwound state of the grid structure are at least partially arranged on a line which is inclined relative to the transverse edges of the grid structure. In the rolled-up state of the grid structure, the transverse edges form the axial ends of the grid structure. The oblique line, on which the first and second joining elements are arranged, forms a spiral shape in the rolled-up state of the lattice structure. The oblique line or the spiral shape corresponds to the longitudinal edges of the lattice structure, which include the joints in the rolled-up state of the lattice structure.

Additionally or alternatively, it is provided that the first and second joining elements in the unwound state of the lattice structure protrude complementarily offset over the first and second longitudinal edges. The longitudinal edge can be arranged obliquely relative to the transverse edges. Alternatively, the longitudinal edge may be aligned at right angles to the transverse edge. The longitudinal edge may extend in the rolled-up state of the lattice structure parallel to the longitudinal axis of the lattice structure. Facing points arranged adjacently in the longitudinal direction of the rolled-up grid structure are arranged alternately offset, the offset being oriented in the circumferential direction. In this case, dislocation patterns can be formed. For example, every second joint may be arranged on a line which runs parallel to the longitudinal edge outside the lattice structure. This applies analogously to every third, fourth, fifth, sixth and further joint. The dislocation pattern can be different in sections, in particular in different longitudinal sections of the grid structure, be different.

Preferably, the joining elements are arranged in the developed state of the grid structure zigzag or sawtooth. In other words, the longitudinal edges of the grid structure in the developed state can be zigzag-shaped or sawtooth-shaped. The zigzag or sawtooth

Arrangement of the joining elements has the advantage that the zigzag shape or sawtooth shape causes the centering and fixing of the longitudinal edges of the lattice structure when the lattice structure is rolled up. An axial displacement or an axial offset of the longitudinal edges of the grid structure or of the joining elements is thus avoided.

Preferably, the joining elements are in the developed state of the lattice structure by a web length or at least one cell width of the lattice structure on the

Longitudinal edge in front. Particularly preferably, the joining elements are in groups of individually juxtaposed cells or in groups of at least two times juxtaposed cells over the longitudinal edges.

A further subsidiary aspect of the invention is based on the idea of a method for producing a medical device according to claim 1 or Claim 10, in which a planar grid structure with at least two longitudinal edges rolled up and the longitudinal edges are interconnected such that the grid structure has a spatial shape. For rolling a molding with a funnel is provided, the narrow end of the funnel is connected coaxially with a slotted hollow cylinder. The pre-rolled grid structure is inserted through the funnel in the hollow cylinder such that the joints are connected and aligned with the slotted hollow cylinder such that the fixed by the joints longitudinal edges are accessible for welding. The

Long edges are welded.

With the method according to the invention, a particularly simple and rapid formation of a spatial form of the lattice structure is achieved, the shaping taking place by passing the planar lattice structure through the hopper. The connection of the longitudinal edges of the lattice structure may be due to the particular

Forming the joints are supported. In particular asymmetrical joining elements, which have a longer and a shorter profile side, are advantageous in this case.

According to a preferred embodiment of the method according to the invention, the planar lattice structure is produced by sputtering. The sputtered planar

Lattice structure has an amorphous structure, which is transformed by a heat treatment in a crystalline structure. In this case, the heat treatment takes place after rolling up the grid structure and welding the longitudinal edges. The

subsequent heat treatment on the one hand causes the structural transformation of an amorphous structure to a crystalline structure of the lattice structure. On the other hand, by the heat treatment residual stresses in the material of the lattice structure, which were generated by the rolling or by the spatial shaping degraded. Moreover, by the subsequent heat treatment, a homogenization of the welds or welds is achieved.

Alternatively or additionally, the planar lattice structure may be subjected to a heat treatment. The heat treatment takes place before the rolling up of the lattice structure.

By welding the longitudinal edges of the grid structure may also have a

Weld produced by a mechanical post-processing, in particular a rolling process or a compression process in the radial Direction, is solidified. In this way, the weld can be improved in terms of their mechanical properties. In particular, a mechanical work hardening is introduced into at least one upper material layer of the weld by the mechanical post-processing, so that residual stresses are generated in the weld material which increase the resistance of the weld to fatigue failure. The mechanical post-processing is preferably carried out locally limited to the weld. For example, a local compression in the weld can be effected by a pin to a localized one

Solidification. Other suitable tools for solidifying the

Weld seam are punch devices, pressing devices or crimping devices.

Furthermore, it can be provided, after rolling up the grid structure and the

Heat treatment to heat the weld or weld locally. The heat treatment can take place before or after the rolling up of the lattice structure. For local heating, for example, a heated pin is suitable, which transfers the heat substantially punctiform in the weld. Preferably, the pin has similar dimensions as the weld. The shape of the pin can also correspond to the shape of the weld. Due to the local heat input, a locally limited microstructure transformation takes place, so that the weld seam is locally or selectively solidified. The local heat input can be combined with a mechanical compression of the weld. Both local heating and local mechanical compression can be applied over the entire surface of the weld, as well as over a portion of the weld or in places in the weld.

The invention will be described below with reference to embodiments

With reference to the accompanying schematic drawings explained in more detail.

Show in it

Each show a plan view of a joint of the medical device according to the invention according to a preferred embodiment, which is symmetrical, wherein the joints, in particular the joining elements, have different geometries; Fig. 5 is a plan view of a joint of the invention

medical device according to a preferred embodiment, wherein the double-sided profile of the first joining element has profile pages of different lengths;

Fig. 6 is a plan view of a joint of the invention

medical device according to another preferred

Embodiment in which the stopper is curved;

7 and 8 each show a plan view of a joint of the medical device according to the invention according to a preferred embodiment, wherein in each case two first joining elements engage in a common second joining element;

9 and 10 each show a plan view of a joint of the medical device according to the invention according to a preferred embodiment, wherein the joint additionally comprises a functional element;

Fig. 11 is a plan view of a joint of the invention

Device according to a further preferred embodiment, wherein the first joining element with a single web of the

Grid structure and the second joining element is connected to three webs of the grid structure;

12 is a plan view of a section of the grid structure of

The medical device according to the invention

preferred embodiment, wherein two joints are shown, which are oriented in different directions;

13a is a perspective view of a molded part for producing the

The medical device according to the invention

preferred embodiment;

FIG. 13b is a front view of the molded part according to FIG. 13a; FIG.

FIG. 13c shows a side view of the molded part according to FIG. 13a; FIG. FIG. 13d is a bottom view of the molded part according to FIG. 13a; FIG.

14 to 16 each show a plan view of a joint of the medical device according to the invention according to a preferred

Embodiment, wherein the double-sided profile of the first joining element different profile sides and the second

Joining element has side-equal outer contours;

17 is a side view of a medical invention

Device according to a preferred embodiment, wherein the grid structure has a plurality of joints, which are arranged on a line extending spirally about the longitudinal axis of the grid structure;

FIG. 18 shows a plan view of the grid structure of the medical device according to FIG. 17 in the unwound state; FIG.

19 is a plan view of a grid structure of the invention

medical device in the unwound state according to a preferred embodiment, wherein the joining elements project in each case by a web length over the longitudinal edges of the grid structure;

20 and 21 each show a plan view of a grid structure of the medical device according to the invention in the unwound state according to a preferred embodiment, wherein the joints project by a web length over the longitudinal edges, which extend in a zigzag shape in the longitudinal direction of the grid structure. and

22 to 24 each show a plan view of a grid structure of the medical device according to the invention in the unwound state according to a preferred embodiment, wherein the joining elements project in groups of juxtaposed cells over the longitudinal edges of the grid structure.

The invention relates to a medical device for intravascular applications in the living body with a lattice structure that is expandable and compressible. The medical device may in particular be a stent, a thrombosis filter, an occlusion device or a device for the intravascular removal of particles from the living body. The lattice structure 10 comprises webs 13 which bound the cells 19. The webs 13 are interconnected in nodes 14. In each case at least three webs 13, preferably four webs 13, bound a cell 19. The webs 13 may extend substantially straight.

Alternatively, the webs 13 may have a curved or otherwise non-rectilinear shape.

The lattice structure 10 may be made by laser cutting from a solid material. It is also conceivable to produce the lattice structure 10 by braiding wire elements. The production of the lattice structure 10 is preferably made of a foil which is or is structured in such a way that the cell structure results with the cells 19 and the webs 13. The grid structure 10 is preferably made of a planar base material. The planar base material or the unwound

Lattice structure 10 has two longitudinal edges 11, 12, which are connected to each other or connected to form a spatial shape of the lattice structure 10. The spatial shape of the lattice structure 10 preferably corresponds to a cylindrical shape or a tubular shape. The axial ends of the cylindrical or tubular lattice structure 10 corresponding to the transverse edges 50 of the lattice structure 10. In general, the lattice structure 10 can assume a rotationally symmetrical spatial shape. Other spatial forms, such as tubular or funnel-like shapes with polygonal cross-sectional contour, are possible.

The longitudinal edges 11, 12 extend at least in sections in the longitudinal direction of the lattice structure 10. The longitudinal edges 11, 12 have at least one directional component which extends parallel to the longitudinal axis of the lattice structure 10. The longitudinal edges 11, 12 may extend at least partially obliquely to the longitudinal axis of the lattice structure 10. For example, the longitudinal edges 11, 12 can spiral around the longitudinal axis of the lattice structure 10. The longitudinal edges 11, 12 may also be arranged in a zigzag shape in the longitudinal direction of the lattice structure 10. Overall, connect the longitudinal edges 11, 12, the two transverse edges 50 of

Grid structure 10.

The lattice structure 10 has at least one joint 20 for fixing the

Long edges 11, 12 on. Preferably, the lattice structure 10 has a plurality

Joining points 20 which extend substantially along the longitudinal edges 11, 12th extend. The joint 20 comprises at least a first joining element 21 and a second joining element 22. The first joining element 21 is assigned to a first longitudinal edge 11, in particular connected to the first longitudinal edge 11. The second joining element 22 is assigned to the second longitudinal edge 12 or connected to the second longitudinal edge 22. Preferably, the joining elements 21, 22 are complementary to each other. The joining elements 21, 22 are for custom-fit or

adapted to flush meshing.

1 shows a joint 20 of a lattice structure 10 of the medical device, wherein the joint 20 forms a node 14 of the lattice structure 10. In the node 14 four webs 13 are merged, which move in different directions from the node 14. The node 14 or the

Joint 20 has a first joining element 21 and a second joining element 22. The first joining element 21 and the second joining element 22 are each connected to two webs 13. The first joining element 21 forms, with a plurality of further first and / or second joining elements 21, 22 adjacently arranged in the longitudinal direction of the lattice structure 10, the first longitudinal edge 11 of the lattice structure 10. Analogously, the second joining element 22 forms with further second and / or first

Joining elements 22, 21 which are arranged adjacent in the longitudinal direction of the lattice structure 10, the second longitudinal edge 12 of the lattice structure 10. The first and second longitudinal edge 11, 12 of the lattice structure 10 may thus each comprise a plurality of first joining elements 21 and / or a plurality of second joining elements 22.

For example, the first longitudinal edge 11 in each case alternately first and second joining elements 21, 22 have. Complementarily, the second longitudinal edge 12 alternately has second and first joining elements 22, 21. The first longitudinal edge 11 can also comprise only first or only second joining elements 21, 22, wherein the second longitudinal edge 12 comprises only second or only first joining elements 22, 21 complementary thereto. Alternatively, the longitudinal edge 11, 12 may be formed by aligned webs 13, at the junction of first or second joining elements 21, 22 are arranged. At least a part of the joining elements 21, 22 can over the

Longitudinal edge 11, 12 protrude.

The first joining element 21 comprises or forms a double-sided profile 23. The double-sided profile 23 has a first profile side 32 and a second profile side 33. In the embodiment according to FIG. 1, the double-sided profile 23 is substantially trapezoidal, the profile sides 32, 33 forming essentially triangular projections. In general, the double-sided profile 23 an anchor which engages in the second joining element 22 such that the double-sided profile 23 and the first joining element 21 both in different

Longitudinal directions LR1, LR2 of the lattice structure 10, as well as in different

Circumferential directions URl, UR2 of the lattice structure 10 is fixed. The fixation is preferably positive. The double-sided profile 23 is oriented generally in opposite first and second directions I, II. In the embodiment according to FIG. 1, the first direction I corresponds to the first longitudinal direction LR1 of the lattice structure 10. The second direction II corresponds to the second longitudinal direction LR2 of the lattice structure 10. This means that the double-sided profile 23 according to FIG. II, which run essentially parallel to the longitudinal axis of the lattice structure 10. Another orientation of the double-sided profile 23 or generally the joint 20 is possible. For example, the first and second directions I, II can be oriented obliquely with respect to the longitudinal axis of the lattice structure 10 or the first and second longitudinal directions LR1, LR2 of the lattice structure 10. In general, it is preferred that the double-sided profile 23 is oriented in opposite first and second directions I, II, which run essentially parallel to the first and / or second longitudinal edge 11, 12.

The first joining element 21 further comprises a stop 24 which extends between the first profile side 32 and the second profile side 33 of the double-sided profile 23. Concretely, the stop 24 in a third direction III, which is different from the first and second directions I, II. The third direction III is preferably oriented at a right angle to the first and second directions I, II. The third direction III, as shown in the embodiment of FIG. 1, correspond to a first circumferential direction URI of the lattice structure 10. The stop 24 is thus oriented in the circumferential direction of the lattice structure 10. Of the

Stop 24 may be rectilinear or planar, as shown in Fig. 1. Alternatively, the stop 24 may be curved or arched, as can be seen in FIG. 6, for example. Furthermore, the stop 24 may be V-shaped or generally angled.

The second joining element 22 has a profile that is complementary to the first joining element 21. In particular, the profile of the second joining element 22 of a

Negative shape of the first joining element 21 correspond. Concretely, the second joining element 22 has an inner contour 34 which corresponds to the geometry or the shape of the double-sided profile 23 and the stop 24 of the first joining element 21. An outer contour 35 of the second joining element 22 is substantially can be designed as desired. In the embodiment according to FIG. 1, the second joining element 22 essentially has a rectangular outer contour. Overall, the second joining element 22 is formed such that the inner contour 34 of the second joining element 22, the double-sided profile 23 in opposite

Directions, in particular in the first and second direction I, II, embraces. The first and second profile side 32, 33 of the first joining element 21 are each embraced by the second joining element 22 such that the first joining element 21 is fixed in a form-fitting manner in the first and second direction I, II. Moreover, the second joining element 22 engages behind the double-sided profile 23 of the first joining element 21, so that an undercut 26 is formed on the side 25 facing away from the stop 24. The protruding on both sides of the stop 24 first and second profile sides 32, 33 and first and second lugs 27, 28 of the double-sided profile 23 are completely enclosed by the second joining element 22, so that the first joining element 21 not only in the first and second Direction I, II, but also in the third direction III is positively fixed. The connection between the first joining element 21 and the second joining element 22 or the shape of the joint 20 corresponds in the

Essentially a tongue and groove connection, wherein the spring has laterally projecting lugs 27, 28, which are engaged behind by the profile of the second joining element 22, so that a fixation is also possible in a third direction III.

For the final fixed fixation of the joint 20 is further provided to connect the first joining element 21 and the second joining element 22 by at least one welding point 29. In Fig. 1, two welds 29 and multiple welds 29 comprehensive welds are shown, which are arranged in the region of the stop 24 of the first joining element 21. The welding points 29 fix the

Connecting the first joining element 21 with the second joining element 22 in the radial direction or generally in a fourth direction, which is oriented substantially perpendicular to the first, second and third directions I, II, III. By the welding points 29 it is achieved that the first and second longitudinal edges 11, 12 in the same

Peripheral level of the grid structure 10 are fixed.

In the embodiment according to FIG. 2, the first joining element 21 has a double-sided profile 23, which is substantially teardrop-shaped.

Concretely, the double-sided profile 23 has a first and second profile side 32, 33, which are curved or arched outwards, that is, in the first or second direction I, II. Between the first profile side 32 and the second profile side 33, the stop 24 extends substantially in a straight line, wherein the stop 24 in the third Direction III is oriented. The second joining element 22 comprises two contact surfaces 30, 31, which are assigned to the outer contour 35 of the second joining element 22. The outer contour 35 of the second joining element 22 substantially corresponds to a trapezoidal shape, wherein the two Trapezecken having an acute angle, in each case pass over a web 13 of the lattice structure 10. The longer side of the trapezium is arranged opposite the stop 24. The shorter trapezoidal side forms the first and second contact surfaces 30, 31, which bear against the first joining element 21. Between the two contact surfaces 30, 31, the shorter trapezoidal side has an opening through which the double-sided profile 23 of the first joining element 21 engages in the second joining element 22. Because of the curvature of the profile side 32, 33 of the double-sided profile 23, the second joining element 22 engages behind the double-sided profile 23 of the first joining element 21 at the same time. The structure of the joint 20 of FIG. 2 is substantially similar to the connection between two puzzle pieces.

The embodiment according to FIG. 3 essentially corresponds to the exemplary embodiment according to FIG. 1, wherein the double-sided profile 23 of the first joining element 21 is substantially anvil-shaped. The profile sides 32, 33 of the double-sided profile 23 have in particular a first edge 36 which has a

Extension of the rectilinear stop 24 forms. Adjacent to the first edge 36 is a second edge 37 which extends at right angles to the first edge 36. A third edge 38 forms a right angle with the second edge 37. The first and second edges 36, 37 are rectilinear. The third edge 38 has a curvature which merges into a web 13 as it proceeds from the second edge 37. The second joining element 22 has a substantially rectangular outer contour 35, which extends around the double-sided profile 23 such that the first and second profile side 32, 33 are gripped and engaged behind each other.

The inner contour 34 of the second joining element 22 is adapted to the contour or the shape of the double-sided profile 23 such that the first joining element 21 is fixed in a form-fitting manner in first, second and third directions. The latter applies to all embodiments.

FIG. 4 shows a further exemplary embodiment, wherein the first joining element 21 is arranged substantially at the connection point of two webs 13 of the lattice structure 10 or projects beyond the connection point of two webs 13 of the lattice structure 10. The first joining element 21 forms a teardrop-shaped double-sided profile 23 with outwardly curved profile sides 32, 33. The double-sided profile 23 engages in a complementary inner contour 34 of the second joining element 22. The second joining element 22 has substantially a V-shaped outer contour 35, wherein the outer contour 35 comprises a first and second contact surface 30, 31, which are arranged at an angle to each other. The first contact surface 30 encloses an angle with the second contact surface 31 which substantially corresponds to the angle formed between the webs 13 of the lattice structure 10, which are brought together in the first joining element 21. The contact surfaces 30, 31 thus lie flush against the webs 13. The fixation of the joint 20 as shown in FIG. 4 is performed by welding points 29 and welds, which include a plurality of welds 29. The welds 29 or welds connect on the one hand the first contact surface 30 with a web 13 of the lattice structure 10, which is fixed to a further web 13 of the lattice structure 10 in the region of the first joining element 21 or

is connected in one piece. Another weld 29 or another weld is provided between the second contact surface 31 and the further web 13 of the lattice structure 10. Moreover, another weld point 29 or a

Weld seam provided in the region of the stop 24 of the first joining element 21, so that the stop 24 is firmly connected to the second joining element 22. The stop 24 has in the embodiment of FIG. 4 on a slightly curved shape, wherein the curvature or bulge extends in the third direction III.

In the embodiments of FIGS. 1 to 4 described above, the double-sided profile 23 is formed symmetrically, wherein the axis of symmetry extends in the third direction III. Specifically, the double-sided profile 23 has a first profile side 32 which has the same shape as the second profile side 33 in a mirror-inverted arrangement. In the following embodiment according to FIG. 5, however, the double-sided profile 23 is asymmetrical. In particular, one profile side 32, 33 of the double-sided profile 23 is designed to be longer than the other profile side 33, 32.

Fig. 5 shows a joint 20, a first joining element 21 and a second

Joining element 22 includes. The first joining element 21 is connected to two webs 13 of the lattice structure 10. The first joining element 21 comprises a double-sided profile 23 with a first profile side 32 and a second profile side 33. Between the first profile side 32 and the second profile side 33 extends a stop 24, which is formed substantially at an angle. Concretely, the stop 24 forms a V The first profile side 32 of the double-sided profile 23 forms a first nose 27, which extends in a first direction I. The second profile side 32 forms a second nose 28 which extends in a second direction II. The first and second directions I, II are oriented opposite to each other. The first nose 27 or the first profile side 32 of the double-sided profile 23 has a greater longitudinal extension than the second nose 28 and the second profile side 33. This means that the first lug 27 extends further in the first direction I than the second lug 28 extends in the second direction II. The undercut formed by the second joining element 22 in the region of the profile side 32, 33 is therefore designed to be larger on the first profile side 32 than on the second profile side 33.

The joining of the first joining element 21 with the second joining element 22 or the formation of the joint 20 in the embodiment of FIG. 5, for example, take place by first the first profile side 32 and the first nose 27 of the first joining element 21 in the second joining element 22 is inserted. By a rotational movement about a virtual axis of rotation, which is arranged in the region of the stop 25 on the opposite side 25 on the first profile side 32, the second profile side 33 can be moved into the inner contour 34 of the second joining element 22. Due to the comparatively small protrusion of the second nose 28, it is possible that the second profile side 33 snaps into the inner contour 34 of the second joining element 22. On the second profile side 33 of the double-sided profile 23 can thus be formed a snap closure-like mechanism. The final fixation of the joint 20 in a fourth direction, which is arranged perpendicular to the first, second and third directions I, II, III, in particular in the radial direction with respect to the rolled-up lattice structure 10, by welding points 29, which in the region of Stop 24 are arranged. Preferably, in each case a rectilinear portion of the V-shaped stop 24, a weld point 29 is assigned.

FIG. 6 shows a joint 20 of the lattice structure 20 of the medical device, which has a first joining element 21 with a symmetrical double-sided profile 23. The double-sided profile 23 comprises two profile sides 32, 33 or lugs 27, 28, which extend slightly in first and second directions. Between the first and second profile sides 32, 33 a curved stop 24 is arranged, the curvature of which extends in the third direction III. The curvature of the

Stop 24 is formed substantially parabolic. In the profile pages 32, 33 closer portions of the stopper 24, the welding points 29 are provided, which firmly connect the first joining element 21 with the second joining element 22. The lugs 27, 28 of the double-sided profile 23 have a rounded shape and are slightly protruding in such a way that a snap closure-like joining mechanism results between the first joining element 21 and the second joining element 22. The first joining element 21 can thus be inserted into the second joining element 22 in the third direction III, wherein the first joining element 21 snaps into the second joining element 22. The second joining element 22 engages around and engages behind the double-sided profile 23 of the first joining element 21 upon contact with the stop 24, so that the first joining element 21 is fixed in a form-fitting manner in first, second and third directions I, II, III.

FIG. 7 shows an exemplary embodiment in which two first joining elements 21 engage in a second joining element 22 to form a joint 20. For reasons of clarity, the welding points 29 are shown in the drawing only in one of the first joining elements 21. In fact, both first joining elements 21 have the same arrangement and number of welding points 29. The first joining elements 21 each form a web end 13a of a web 13 of the lattice structure 10. The web ends 13a of the webs 13, which each form a first joining element 21, are curved in different directions. The web end or the first joining element 21 has in each case a double-sided profile 23 which comprises a first profile side 32 and a second profile side 33. The first profile side 32 essentially forms a hook-shaped projection which extends from the web end 13a in the first direction I. The second profile side 33 forms a recess, which has a substantially similar contour as the projection of the first profile side 32. Between the first and the second profile side 32, 33, the stop 24, which extends into the third

Direction III is oriented. The stopper 24 is rectilinear. The first joining element 21 engages flush in the second joining element 22, wherein da second joining element 22, the profile sides 32, 33 surrounds and engages behind. The profile sides 32, 33 are arranged with respect to the stop 24 at an angle, wherein the first profile side 32 with the stop 24 forms an obtuse angle and the second profile side 33 with the stop 24 an acute angle. Between the in the first direction I protruding first profile side 32 and the first nose 27 and the web 13 of the undercut 26 is formed, which is a positive fixation of the first

Ensures joining element 21 in the third direction III. Another undercut 26 is formed by the oblique second profile side 32, which is aligned with the stop 24 at an acute angle. The fixed connection of the first joining element 21 with the second joining element 22 is effected by the welding points or welding seams 29, with four welding points 29 being provided for each first joining element 21 according to FIG. The welding spots 29 are provided on the one hand in the area of the first and second profile sides 32, 33 and on the other hand against contact surfaces 30, 31 of the second joining element 22, which bear against the web 13.

Fig. 8 shows a further embodiment of a joint 20, wherein the first joining element 21 is formed by a rectangular end 15 of a web 13. The right-angled end 15 has a first side surface 16 and a second side surface 17, the first and second side surfaces 16, 17 being aligned parallel to each other. Between the first and second side surfaces 16, 17 extends at a right angle, an end face 8, which limits the web 13 and the rectangular end 15. The web 13 engages in the second joining element 22 at an angle with respect to the longitudinal axis or with respect to the first and / or second longitudinal direction LR1, LR2 of the lattice structure 10. The first joining element 21 or the right-angled end 15 has a double-sided profile 23 which is formed on the one hand by the first side face 16 and on the other hand by the combination of the second side face 17 and the end face 18. The first profile side 32 of the double-sided profile 23 corresponds to the first side surface 16. The second profile side 33 is at least partially by the second side surface 17 and the

Face 18 formed. The first joining element 21 further comprises a stop 24, which is formed at least in sections by the first side face 16 and the end face 18. The second joining element 22 has two substantially rectangular recesses arranged at an angle to one another, into which two first joining elements 21 engage with an exact fit. The fixing of the first joining elements 21 with the second joining element 22 is effected by spot welds 29 which are arranged in the region of the first side face 16 and the second side face 17. Because of

Clarity is shown in Fig. 8, only a first joining element 21 with welds 29. In fact, both first joining element 21 have the same arrangement and number of welding points 29.

FIG. 9 shows two cells 19 of a lattice structure 10, which are connected by a joint 20. The joint 20 has two first joining elements 21 and a second joining element 22. The connection between the first and the second joining elements 21, 22 substantially corresponds to the exemplary embodiment according to FIG. 8, wherein the welding seams or welding points 29 in the region of the end face 18 of FIG right-angled end 15 of the web 13 are arranged. Furthermore, in the

Embodiment according to FIG. 9 is provided to arrange a recess, in particular a circular recess, in the second joining element 22, in which functional elements 39 can be fitted. Such functional elements 39 may be, for example, x-ray markers which improve the visibility of the medical device under the influence of x-ray radiation. 10 shows a similar exemplary embodiment, wherein the joint 20 comprises a first joining element 21, which is designed essentially as a connector between two webs 13 of the lattice structure 10. The double-sided profile 23 is formed by two web ends 13 a of the connected webs 13. The second joining element 22 comprises a groove or a channel, which is adapted to the shape of the first joining element 21. The first joining element 21 is inserted flush into the complementary groove of the second joining element 22, so that the second joining element 22 engages around the first joining element 21 from three sides, whereby at the same time the first joining element 21 engages behind. The fixation of the joint 20 is effected by two welding points 29 in the region of the linear stop 24 of the first joining element 21.

11 shows a further exemplary embodiment of the joint 20, wherein the first joining element 21 is formed by a web end 13a of a web 13 of the lattice structure 10. The second joining element 22 is formed by a connection point of three webs 13. The first joining element 21 or the web end 13a of the web 13 essentially has a bone-head-like shape. In particular, the first joining element 21 comprises a double-sided profile 23 with differently curved profile sides 32, 33. The profile sides 32, 33 extend in opposite first and second directions I, II. In a third direction III, the stop 24 is oriented substantially is formed straight. The second joining element 22 essentially has a bone-pan-like shape that corresponds to a negative shape of the double-sided profile 23 of the first joining element 21. The inner contour 34 of the second joining element 22 thus follows the contour of the double-sided profile 23 such that the double-sided profile 23 is encompassed and engaged behind by the second joining element 22. Overall, this results in a fixation of the joint 20 in both the first and second direction I, II, as well as in the third direction III.

In particular, a fixation of the first joining element 21 in the second joining element 22 results in first and second longitudinal directions LR1, LR2 of the lattice structure and in first and second circumferential directions UR1, UR2 of the lattice structure 10. The embodiment according to FIG. 14 essentially corresponds to the exemplary embodiment according to FIG. 5, the outer contour of the second joining element 22 being modified. In particular, the second joining element 22 has an outer contour which is curved on the side of the first profile side 32 of the first joining element 21. In this way, the flexibility of the second joining element 22 is increased on the side of the first profile side 32 of the first joining element 21, whereby the insertion of the first profile side 32 and the first nose 27 of the first joining element 21 in the second joining element 22 is facilitated.

FIG. 15 shows an embodiment which is based on the exemplary embodiment according to FIG. 14. In particular, the region of the joint 20 assigned to the first profile side 32 of the first joining element 21 is constructed analogously to the exemplary embodiment according to FIG. 14. In contrast to the exemplary embodiment according to FIG. 14, in the embodiment according to FIG. 15 it is provided to make the second profile side 33 of the first joining element 21 larger. In particular, the second profile side 33 extends further in the second direction II as the first profile side 32 extends in the first direction I. Thus, a larger undercut is formed in the region of the second profile side 33 than in the region of the first profile side 32. The stop 24 is analogous to the embodiment of FIG. 14 V-shaped, wherein the legs of the stopper 24 are shown in FIG. 15 of different lengths , Specifically, it is provided in the embodiment of FIG. 15 that a first of the first profile side 32 facing leg of the stopper 24 is formed longer than a second, the second profile side 33 facing leg.

It is possible for a cell 19 to include a plurality of joints 20, as shown in FIG. The joints 20 each include a first joining element 21 and a second joining element 22, wherein the first and / or the second joining element 21, 22 may each be assigned to different cells 19. The joints 20 each form nodes 14 of the lattice structure 10. The geometry of the joints 20, in particular of the first and second joining elements 21, 22 may also

be different. In particular, as shown in FIG. 12, it may be provided that the first joining elements 21 each have a double-sided profile 23, wherein the double-sided profile 23 of different joints 20 in different

Oriented directions. For example, the double-sided profile 23 of a first joint 20 is oriented in first and second longitudinal directions LR1, LR2 and a second double-sided profile 23 of a second joint 20 in opposite first and second circumferential directions UR1, UR2. The production of the spatial form of the lattice structure 10 is preferably carried out by rolling the lattice structure 10 in a cylindrical or generally rotationally symmetrical shape. For this purpose, a molded part 40 is advantageously provided, which is shown by way of example in FIGS. 13a to 13d. The molding 40 includes a funnel 41 having a narrow funnel end 42. The narrow funnel end 42 merges flush into a slotted hollow cylinder 43. The hollow cylinder 43 is aligned coaxially with the hopper 41. The hollow cylinder 43 includes a slot 44, which in the

Embodiment according to FIG. 13a to 13d is rectilinear. The slot 44 can also rotate in a spiral around the longitudinal axis of the hollow cylinder 43 or extend zigzag along the hollow cylinder 43.

The lattice structure 10, which is initially in the form of a planar structure, is easily rolled forward and inserted into the hopper 41. By further movement of the lattice structure 10 in the direction of the hollow cylinder 43, the lattice structure 10 is successively curved or rolled until the lattice structure 10 is completely disposed within the hollow cylinder 43. In FIGS. 13a to 13d, the initial position of the lattice structure 10 as it enters the hollow cylinder 43 is shown. In the front view according to FIG. 13d, the lattice structure 10 appears to be flattened on one side, which is only apparent

graphic reasons by the representation of the visible edges results. In fact, the lattice structure in the illustrated state, at least in the region of the narrow Tricherendes 42 on a circular contour. During the movement of the lattice structure 10 through the hopper 41 into the hollow cylinder 43, the joints 20 are connected.

By joining points 20, the first joining elements 21 having an asymmetrical double-sided profile 23, the joining process can be facilitated. In this case, the further projecting profile side 32, 33 of the double-sided profile 23 engages first into the second joining element 22. The comparatively smaller projecting profile side 33, 32 of the double-sided profile 23 snaps into the second joining element 22 in the further course, so that the double-sided profile 23 is completely encompassed by the second joining element 22 and engaged behind. A particularly suitable construction of the joint 20 is shown for example in Figs. 5, 14 and 15.

The movement of the lattice structure 10 into the hopper 41 or the hollow cylinder 43 or generally the molded part 40 can be assisted by a mandrel which is arranged within the lattice structure 10. The mandrel preferably has a structuring which engages in the cells 19 of the lattice structure 10. The axial displacement of Lattice structure 10 with respect to the molded part 40 can thus take place via the mandrel, which transmits the axial feed force via the structuring to the webs 13 of the lattice structure 10. At the same time, a rotation of the lattice structure 10 within the molding 40 can be achieved by the structured mandrel, so that the longitudinal edges 11, 12 of the lattice structure 10 to be joined or the joints 20 can be aligned with the slot 44 of the hollow cylinder 43. Once the grid structure 10 is fully disposed within the hollow cylinder 43 and the joints 20 are aligned with the slot 44, the weld spots 29 may be set, for example by a laser welding apparatus. The connection of the longitudinal edges 11, 12 at the joints 20 is thus fixed.

FIG. 16 shows a further exemplary embodiment of a joint 20, which is advantageous in particular in connection with the production of the spatial shape of the lattice structure 10 with the aid of the molding 40. In this case, the first one

Joining element 21 on a double-sided profile 23, which includes a longer first profile side 32 and a relatively shorter profile side 33. In particular, the double-sided profile 23 has two lugs 27, 28, wherein a first lug extends further in a second direction II than a first lug 27 extends in a first direction I. The second joining element 22 has an inner contour 34, which corresponds to the contour of the double-sided profile 23, so that the double-sided profile 23 flush or

fit exactly into the inner contour 34 of the second joining element 22 can be introduced. The movement of the lattice structure 10 into the molded part 40 preferably takes place in the second direction II, so that the first lug 27 first engages in the inner contour 34 of the second joining element 22. Upon further movement of the lattice structure 10 in the molded part 40 in the second direction II is a rotational movement of the first joining element 21 with respect to the second joining element 22 by a virtual

An axis of rotation which is substantially in the region of the undercut 26 of the first

Profile page 32 is arranged. In this way, the second nose 28 snaps into the inner contour 34 of the second joining element 22, whereby a complete

closed, flush joint 20 is provided.

In the arrangement of a plurality of joints 20 along the lattice structure 10, it is advantageous to arrange the joints 20 distributed over the circumference of the lattice structure 10. In this way it is avoided that the joints 20 the

mechanical properties, in particular the flexibility, the lattice structure 10 influence on one side. For example, the joints 20 may be arranged on a line L, which in the rolled or rolled state of the lattice structure 10th spirally wound around the longitudinal axis of the lattice structure 10, as shown in Fig. 17. In order to produce such a spatial shape of the lattice structure 10, a planar lattice structure 10 can be used which has two longitudinal edges 11, 12, which extend obliquely relative to the transverse edges 50.

Such a configuration is shown in FIG. The planar lattice structure 10 has a first longitudinal edge 11 and a second longitudinal edge 12, which are arranged parallel to one another and obliquely relative to the transverse edges 50. The first longitudinal edge 11 is formed by webs 13 connected in alignment with one another. At the connection points of the individual webs 13 joining elements 21, 22 are provided. The second longitudinal edge 12 is likewise formed by webs 13 which are connected to one another in an aligned manner, wherein a joining element 21, 22 protrudes by a web length via the second longitudinal edge 12 at the connection points between the individual webs 13. In the production of the spatial shape of the lattice structure 10, the joining elements 21, 22 of the first longitudinal edge 11 are connected to the joining elements 21, 22 of the second longitudinal edge 12, so that a homogeneous lattice structure 10 with substantially uniform cells 19 results. The joining elements 21, 22 of the first longitudinal edge 11 and the joining elements 21, 22 of the second longitudinal edge 12 together form joints 20 which are in the rolled-up state of the lattice structure 10 on a line L arranged spirally around the longitudinal axis of the lattice structure 10.

A similar exemplary embodiment is shown in FIG. 19, wherein the unwound lattice structure 10 illustrated has two longitudinal edges 11, 12, which are arranged parallel to one another and obliquely with respect to the transverse edges 50. The first and second longitudinal edges 11, 12 each have joining elements 21, 22, wherein each second joining element 21, 22 projects beyond the longitudinal edge 11, 12 by a web length. The over the longitudinal edges 11, 12 projecting joining elements 21, 22 are arranged offset from one another such that when rolling up the lattice structure 10 each one

protruding joining element 21, 22 of the first longitudinal edge 11 between two

protruding joining elements 21, 22 of the second longitudinal edge 12 is arranged. In the rolled-up state of the lattice structure 10, this results in a staggered arrangement of the joints 20 by a respective web length, wherein the offset joints 20 are arranged on a spiral line about the longitudinal axis of the lattice structure 10. FIG. 20 likewise shows a lattice structure 10 in the unwound state, wherein the joining elements 21, 22 of different longitudinal edges 11, 12 project in each case alternately over the longitudinal edge 11, 12 by a web length. The longitudinal edges 11, 12 are also arranged in a zigzag shape in the longitudinal direction of the lattice structure 10. in the

rolled state of the lattice structure 10 thus results in a profile of the longitudinal edges 11, 12 along a line L, which extends in sections spirally around the longitudinal axis of the lattice structure 10. The direction of rotation of the spiral line L is locally reversed. This means that at the points where the longitudinal edges 11, 12 of the unwound lattice structure 10 change the orientation direction, the helical line L of the longitudinal edges 11, 12 in the rolled-up state of the lattice structure 10 changes the direction of rotation.

In Fig. 21, a similar embodiment is shown, wherein the extension of the longitudinal edges 11, 12 in one direction or the distance between two deflection points of the longitudinal edges 11, 12 is chosen so short that in the rolled state of the lattice structure 10 on a peripheral portion of Grid structure 10 a zigzag-shaped course of the longitudinal edges 11, 12 results. In addition, the joints 20 at the longitudinal edges 11, 12 analogous to the embodiment of FIG. 18th

arranged so that the joints 18 are arranged in the rolled state of the lattice structure 10 on a single zigzag line L along the lattice structure 10.

Exemplary embodiments are shown in FIGS. 22 to 24, wherein the longitudinal edges 11, 12 of the lattice structure 10 are arranged at right angles to the transverse edges 50. FIGS. 22 to 24 show the unwound state of the lattice structure 10.

In the embodiment according to FIG. 22, individual cells 19 are provided on the side of a first longitudinal edge 11, which protrude beyond the longitudinal edge 11 and in each case comprise three joining elements 21, 22. Between the individual,

protruding cells 19 are each two cells 19 arranged, which are the first

Limit longitudinal edge 11 and each have a joining element 21, 22. The cells 19, which delimit the first longitudinal edge 11 and which each comprise a joining element 21, a group of two cells 19 is arranged opposite in the region of the second longitudinal edge 12, each carrying three joining elements 21, 22. The groups of two cells 19 associated with the second longitudinal edge 12 project beyond the second longitudinal edges 12. Between each two groups of two cells 19, which project beyond the second longitudinal edge 12, a cell 19 is arranged in each case, which limits the second longitudinal edge 12 and comprises a joining element 21, 22. In the rolled-up state of the lattice structure 10, the first and second longitudinal edges 11, 12 and the corresponding protruding cells 19 are connected to one another in such a way that a cell row results in the longitudinal direction of the lattice structure 10, whose cells each comprise four joints 20.

The exemplary embodiment according to FIG. 23 is similar to the exemplary embodiment according to FIG. 22, with groups of double-spaced cells 19 protruding beyond each longitudinal edge 11, 12. Between each two groups of cells 19 arranged two by two, a cell 19 is provided which, on the one hand, delimits the longitudinal edge 11, 12 and, on the other hand, comprises a joining element 21, 22. By contrast, the groups of cells 19 arranged twice adjacent to one another each comprise five joining elements 21, 22. In the rolled-up state of the lattice structure 10, two cell rows extending in the longitudinal direction of the lattice structure 10, comprising cells 19 with four joints 20 each.

A similar construction is shown in the embodiment according to FIG. 24, wherein the groups of cells 19 arranged at least twice next to one another and projecting beyond the longitudinal edge 11, 12 are each connected to a further group of cells 19 arranged two by two. Across the first and second longitudinal edges 11, 12 there are alternately two interconnected groups of cells 19 arranged two-by-two, so that in the rolled-up state of the lattice structure 10 there are two cell rows extending in the longitudinal direction of the lattice structure 10 and two cells each a longitudinal row, each comprising four joining elements 21, 22, follow two cells 19, each having a joining element 21, 22.

In general, welding of the longitudinal edges 11, 12 of the lattice structure 10 takes place in the region of the joints 20. In order to improve the mechanical properties of the joints 20, it may be provided after the joining process or after welding to rework the weld or the weld point 29 mechanically.

For example, a compression of the welding point 29, in particular by rolling, be provided. In this way, a mechanical work hardening is achieved in the uppermost material layer, whereby the weld or the weld point 29 has a higher resistance to fatigue failure. The mechanical compression can be carried out selectively at the welding point 29 become. Further, a heat treatment of the welds 29 may be provided to homogenize the welds or welds.

LIST OF REFERENCES

10 grid structure

11 first longitudinal edge

12 second longitudinal edge

13 bridge end

14 node

15 right-angled end

16 first side surface

17 second side surface

18 face

19 cell

20 joints

21 first joining element

22 second joining element

23 double-sided profile

24 stop

25 opposite side

26 undercut

27 first nose

28 second nose

29 welding point

30 first contact surface

31 second contact surface

32 first profile page

33 second profile page

34 inner contour

35 outer contour

36 first edge

37 second edge

38 third edge

39 functional element

40 molding Funnel funnel end hollow cylinder slot

Claims

claims

A medical device for intravascular applications in the living body having a lattice structure (10) which is compressible and expandable and has at least two longitudinal edges (11, 12) joined together such that the lattice structure (10) has a spatial shape, dadu rch ge n ze ze ch n et that

the lattice structure (10) has at least one joint (20) for fixing the longitudinal edges (11, 12) to at least one first joining element (21) which is connected to a first longitudinal edge (11) and into a second one

Joining element (22) of the joint (20) engages, with a second

Longitudinal edge (12) is connected, wherein the first joining element (21) has a double-sided profile, which is oriented in opposite first and second directions (I, II), and a stop (24) which is oriented in a third direction (III) is, and wherein the second joining element (22) on the one hand surrounds the double-sided profile (23) in opposite directions (I, II) and on the other hand, the double-sided profile (23) in the third direction (III) on the side facing away from the stop (24) (25) of the first joining element (21) engages behind such that the joint (20) forms an undercut (26) which surrounds the longitudinal edges (11, 12) in opposite longitudinal directions (LR1, LR2) and in opposite circumferential directions (UR1, UR2). the grid structure (10) fixed.

Device according to claim 1,

There is no mention that

the joint (20) is symmetrical.

Apparatus according to claim 1 or 2,

d a d u rc h e ke n ze i c h n et that

the double-sided profile (23) of the first pad member (21) two in

opposite directions (I, II) facing lugs (27, 28), between which the stop (24) is arranged.

Device according to one of the preceding claims,

d a d u rch e ke n ze i c h n et that

the stop (24) is rectilinear, angled or curved.

5. Device according to one of the preceding claims,

d a d u rch e ke n ze i ch n et that

the two joining elements (21, 22) are connected by at least one spot weld (29) arranged on the stop (24) and / or by at least two spot welds (29) located on the side facing away from the stop (24) ( 25) of the first joining element (21) are arranged on both sides of the stop.

6. Device according to one of the preceding claims,

d a d u rch e ke n ze i c h n et that

the two joining elements (21, 22) are each connected to at least two webs (13) of the lattice structure (10) and the joining point (20) forms a node (14) of the lattice structure (10).

7. Apparatus according to claim 1,

d a d u rch e ke n ze i c h n et that

the first joint element (21) is formed by an end (15) of a web (13) which is rectangular in plan view and has a parallel first and second side surface (16, 17) and an end surface (18) perpendicular thereto and into the second joint element (22). at an angle relative to the longitudinal axis of the

Grid structure (10) engages, wherein the double-sided profile (23) on the one hand by the first side surface (16) and on the other hand by the combination of the end face (18) and the second side surface (17) is formed and the

Stop by the combination of the first side surface (16) and the

End face (18) is formed.

8. Apparatus according to claim 1,

d a d u rch e ke n ze i ch n et that

two separate first joining elements (21) in each case at the end (13a) of a web (13) are arranged, wherein the web ends (13a) in different

Directions are curved and the two first joining elements (21) together with a second joining element (22) form a node (14) of the grid structure (10).

9. Device according to one of claims 1 to 6,

d a d u rch e ke n ze i c h n et that

the double-sided profile (23) is designed differently such that, to facilitate joining, one profile side (32) is made longer than the other profile side (33).

A medical device for intravascular applications in the living body having a lattice structure (10) which is compressible and expandable and has two longitudinal edges (11, 12) connected together such that the lattice structure (10) has a spatial shape

d a d u rc h e n d i c h n et that

the lattice structure (10) has a plurality of joints (20) for fixing the longitudinal edges (11, 12) each having at least one first joining element (21) which is connected to a first longitudinal edge (11) and into a second joint element (22) of the joint (20) engages, which is connected to a second longitudinal edge (12), wherein the first and second joining elements (21, 22) in the developed state of the lattice structure (10) are arranged at least in sections on a line (L), based on the Transverse edges (50) of the lattice structure (10) extends obliquely and / or the first and second

Joining elements (21, 22) in the unwound state of the lattice structure (10) project beyond the first and second longitudinal edges (11, 12) in such a way that adjacently arranged joints (20) are alternately offset in the circumferential direction in the rolled-up state of the lattice structure (10) ,

11. The device according to claim 10,

d a d u rch e ke n ze i ch n et that

the joining elements (21, 22) are arranged in the unwound state of the lattice structure (10) in a zigzag or sawtooth shape.

12. Device according to claim 10,

d a d u rch e ke n ze i ch n et that

in the unwound state of the grid structure (10), the pad elements (21, 22) protrude beyond the longitudinal edge (11, 12) by a web length or at least one cell width of the grid structure (10). Device according to claim 12,

d a d u rch e ke n ze i ch n et that

the joining elements (21, 22) in groups of individually adjacent

arranged cells (19) or in groups of at least twice

adjacent cells (19) over the longitudinal edge (11, 12) protrude.

A method of manufacturing a medical device according to claim 1 or claim 10, wherein a planar lattice structure (10) comprises

rolled up at least two longitudinal edges (11, 12) and the longitudinal edges (11, 12) are interconnected such that the grid structure (10) has a spatial shape, wherein

- For rolling a molding (40) is provided with a funnel (41) whose narrow funnel end (42) with a slotted hollow cylinder (43) is coaxially connected,

- The pre-rolled grid structure (10) through the hopper (41) in the

Hollow cylinder (43) is inserted such that the joints (20) are connected and aligned with the slotted hollow cylinder (43) such that the fixed by the joints (20) longitudinal edges (11, 12) are accessible for welding and

- The longitudinal edges (11, 12) are welded.

Method according to claim 14,

d a d u rch e ke n ze i ch n et that

the planar lattice structure (10) is produced by sputtering and has an amorphous microstructure which is transformed into a crystalline microstructure by a heat treatment, wherein the heat treatment takes place after the lattice structure (10) has been rolled up and the longitudinal edges (11, 12) are welded together.

Method according to claim 14 or 15,

d a d u rc h e e n n e s n e s that

by welding the longitudinal edges (11, 12) a welding point (29) is produced, which is solidified by a mechanical post-processing, in particular a rolling or compression process.