WO2019053191A1

WO2019053191A1 - Medical catheter, medical system and method for producing a medical catheter

Info

Publication number: WO2019053191A1
Application number: PCT/EP2018/074886
Authority: WO
Inventors: Giorgio Cattaneo; Michael BÜCHERT
Original assignee: Acandis Gmbh
Priority date: 2017-09-15
Filing date: 2018-09-14
Publication date: 2019-03-21
Also published as: DE102017121436A1; EP3681577A1

Abstract

The invention relates to a medical catheter having a catheter tube and at least one inner lumen (18), wherein a reinforcement element (10) is allocated to the catheter tube. The reinforcement element (10) comprises at least two reinforcement structures (11, 12), wherein a first reinforcement structure (11) is formed from at least one monofilament (16) and a second reinforcement structure (12) is formed from at least one multifilament bundle (17). The monofilament (16) and the multifilament bundle (17) are interwoven with each other. The monofilament (16) has a first winding direction and the multifilament bundle (17) has a second winding direction, wherein the first winding direction differs from the second winding direction. The invention further relates to a medical system and a method for producing a medical catheter.

Description

Medical catheter, medical system and method of making a medical catheter

description

The invention relates to a medical catheter according to the preamble of patent claim 1. Furthermore, the invention relates to a medical system and a method for producing a medical catheter.

Such a medical catheter is known, for example, from DE 697 20 583 T2. The known catheter has a tubular body with an inner lumen. In this case, the tubular body may be made of a polymeric material for the catheter tube and a metal reinforcing braid. The reinforcing braid is formed of stainless steel wires and extends along the tubular body. To increase the

Kink resistance of the catheter, conventional reinforcing braids have a high wire diameter and thus a high thickness of the

Reinforcing braid on.

In the case of intracranial medical catheters for the aspiration of a thrombus, it is necessary in particular for the inner lumen of the catheter to have the largest possible cross-sectional diameter so that the thrombi to be aspirated do not completely close the inner lumen. The available

However, the cross-sectional diameter of the inner lumen is generally limited not only by the available outer cross-sectional diameter of the catheter, but also by the thickness of the catheter tube and the thickness of the catheter

Reinforcing braid. Since the outer cross-sectional diameter of the catheter can not exceed a maximum value due to the required compatibility with a catheter sluice, when using the known reinforcing mesh made of steel wires with a high thickness, the

Cross-sectional diameter of the inner lumen are adversely reduced. Furthermore, the catheter may be prone to ovalization by the metallic reinforcing braid. The ovalization of the catheter denotes a deformation of the catheter cross-section and thus also of the inner lumen. In particular, the cross-sectional geometry of an example circular cylindrical catheter by ovalization at least locally occupy an oval cross-sectional geometry. In extreme cases, the catheter cross-section could be deformed in such a way that the inner lumen is obstructed and no longer has a free passage area. The invention is therefore based on the object to provide a medical catheter in which the largest possible cross-sectional diameter of the

Inner lumen can be achieved with sufficient kink resistance. The invention is also based on the object of specifying a medical system and a method for producing a medical catheter. This object is achieved by a medical catheter having the features of claim 1. With regard to the medical system, the object is solved by the subject-matter of claim 12 and with regard to the method by the subject-matter of claim 13.

The invention is based on the idea of a medical catheter

indicate which has a catheter tube and at least one inner lumen, wherein the catheter tube is associated with a reinforcing element. The reinforcing element comprises at least two reinforcing structures, wherein a first reinforcing structure of at least one monofilament and a second reinforcing structure of at least one multifilament bundle is formed. The monofilament and the multifilament bundle are intertwined. The monofilament has a first winding direction and the multifilament bundle has a second winding direction, wherein the first winding direction is different from the second winding direction.

The reinforcing element can in the context of the application one of the

Catheter tube be separate component or form a separate component of the catheter. The reinforcing element can be fixed to the catheter

be connected. However, it may have other mechanical properties than the catheter tube. In general, the reinforcing element changes the mechanical properties of the catheter tube. That's how it works

Reinforcement element be designed such that the bending behavior of the

Catheter tube is improved. In particular, by the

Reinforcement element, the bending stability, or the kink resistance of the

Catheter tube can be increased. The reinforcing element has the advantage that The catheter can move well even in tight bends well in a blood vessel. The navigation capability of the catheter is preserved. Moreover, the reinforcing element ensures that the inner lumen does not deform.

In the context of the application, a multifilament bundle comprises at least two individual monofilaments. By way of example, the monofilaments may be formed as fibers, in particular as synthetic fibers. In the context of the application, the formation of a bundle means that the individual monofilaments of the multifilament bundle, in particular at least in sections, are in contact with one another and run in the same direction, for example parallel to one another. In particular, there are two adjacent ones

Monofilaments in contact along a line and run there in the same winding direction.

The multifilament bundle can take any geometric shape,

in particular a flat geometric shape. It is therefore conceivable that the multifilament bundle has a band-like geometric shape. The invention accordingly has the advantage that the wall thickness of the catheter can be significantly reduced by combining a monofilament with a multifilament bundle, in particular a flat multifilament bundle. Accordingly, the diameter of the inner lumen can advantageously be increased while the catheter outer diameter remains the same. A blockage of the

Inner lumen, exemplified by thrombi to be sucked can therefore be prevented.

The monofilament and the multifilament bundle are intertwined. Thus, the monofilament and the multifilament are bonded together. The multifilament bundle can be woven or woven into the monofilament. The winding directions of the monofilament and the

Multifilamentbündels different from each other. In particular, the monofilament extends in a different direction than the multifilament bundle. Compared to the known reinforcing braid of intersecting steel wires, the woven multifilament bundle, in particular the woven bundle of fibers, can significantly reduce the diameter of the reinforcing element. It can thus be due to the reducible diameter of the

Reinforcing element with constant outer diameter of the catheter preferably increase the diameter of the inner lumen. At the same time have the interwoven multifilament bundles and the monofilament have the advantageous ones

Properties such as increased flexibility, low ovalization and the possibility of torque transfer to.

The reinforcing element according to the invention, which at least two

Includes reinforcing structures, can be used for any type of medical

Catheters for various modes of operation, such as delivery catheters, thermostatic catheters, or aspiration catheters. Since it can be ensured by means of the reinforcing element that the inner lumen does not deform, an impairment of the cooling capacity is avoided by way of example in inner lumens, which carry cooling fluid. In inner lumens, which are exemplified as a passageway to medical instruments to the

Maintaining the site of delivery of the medical instruments is maintained even when the catheter is passed through a tight bend.

The medical catheter can be constructed multilayered by way of example for intracranial application. In this case, the catheter tube of three

Be formed layers. The inner layer, which is directly adjacent to the inner lumen, may consist of a friction-reducing material, in particular a

Plastic, such as PTFE, or other Reibmindernden materials, such as FEP or H DPE be formed. Also friction reducing materials, such as a PTFE-PI compound, PFA or PE are conceivable. Advantageously, the inner layer comprises a chemically resistant material.

On the inner layer, the reinforcing element may be attached to the at least two reinforcing structures. The reinforcing element thus forms the second layer. The first reinforcing structure may be exemplified as

Monofilament include a metal wire. The second reinforcing structure may include, for example as a multifilament bundle, a polymer fiber bundle. The monofilament and the multifilament bundle are intertwined.

Furthermore, a third layer can be attached to the reinforcing element. The third layer may preferably be formed as a polymer layer in various Shore hardnesses. In particular, the third layer may be

Young's modulus in the range of 12 M Pa to 520 M Pa (defined according to ISO 178). The third layer may preferably consist of a thermoplastic elastomer, in particular polyether block amide (PEBA), polyurethane (PU), Polyamide (PA) or comparable materials. The third layer can be extruded directly onto the other layers, dipped or attached to the other layers by means of a reflow process.

Further preferred embodiments of the invention are in the

Subclaims specified.

In a preferred embodiment of the invention, the multifilament bundle is designed such that it can be transferred from a bundled arrangement into a planar arrangement in a braiding process with the monofilament of the first reinforcement structure orthogonal to a bundle axis. The plane arrangement of the multi-purpose bundle refers to the mesh level. In other words, the individual monofilaments of the multifilament bundle can be juxtaposed in one and the same plane, i. H. be arranged planar. In the flat order all monofilaments of the multifilament bundle lie parallel to each other in a plane. In other words, the multifilament bundle is thus designed to be compressible. By the transfer into a planar arrangement during the braiding process with the monofilament of the first

Reinforcement structure, this can be the diameter of the

Reinforcement element and thus reduce the catheter wall thickness efficiently. The compressibility of the multifilament bundle further has the advantage of being flexibly adaptable to various modes of operation of the catheter.

In general, the multifilament bundle can be transferable from a bundled arrangement into a flat arrangement under an occurring surface pressure. Such a surface pressure can occur when pushing the medical catheter through tight vessel bends. In this case, the braid can be bent from the multifilament bundle and the monofilament of the first reinforcing structure. By way of example, a surface pressure on the multifilament bundle acts at the bending point, whereby it can be converted into a planar arrangement. The planar arrangement of the multifilament bundle can by the

multilayered structure of the catheter can be fixed. In other words, the planar arrangement can be maintained by embedding the reinforcing element in an inner and outer layer of the catheter. In particular, the planar arrangement of the multifilament bundle can be determined by a ratio between the width and height of the multifilament bundle. The height h of the multifilament bundle is determined substantially perpendicular to the braid plane. The width b of the multifilament bundle is determined in the mesh level. For the planar arrangement of the multifilament bundle, the bundle has a greater width b than height h. In particular, the ratio h / b between height and width of the multifilament bundle can be from 0.01 to 0.8, in particular 0.5. It is also possible that the ratio h / b between height and width of the multifilament bundle between 1/2 and 1/10, in particular 1/10 or 1/8 or 1/7 or 1/6 or 1/5 or 1/4 or 1/3 or 1/2. In the planar arrangement with a greater width than height, the multfilament bundle resembles a ribbon fiber. As a result, the catheter wall thickness can be further reduced.

Furthermore, the reinforcing element can have a different number

Monofilaments and multifilament bundles. Thus, various mechanical properties of the reinforcing element can be realized.

In particular, the ratio between monofilaments of the first

Reinforcement structure and multifilament bundles of the second reinforcing structure 4/2 or 8/4 amount. For example, thus 4 wires and 2

Multifilamentbündel, or 8 wires and 4 multifilament bundles to form the reinforcing element are intertwined. The use of 8 monofilaments, in particular wires, and 4 multifilament bundles is particularly preferred.

Preferably, the first reinforcing structure comprises a first material,

in particular a metal, and the second reinforcing structure a second

Material, in particular a plastic, wherein the first material is different from the second material. By way of example, the first reinforcing structure may be formed from at least one metal wire. Preferred materials are stainless steel or a nickel-titanium alloy. The wire may preferably be formed as a radiopaque wire. The second reinforcing structure, which is formed from at least one multifilament bundle, may for example comprise a bundle of individual synthetic fibers, in particular multifilament polymer fibers. Preferably, the plastic fibers may be formed of para-aramid. It is of particular advantage if the bundle is formed from a material which has a low weight or a low elongation or a has high tensile strength. Furthermore, it is of particular advantage if the bundle is formed from a material which has a temperature resistance up to 650 ° C.

In general, the wire, or the wires or the individual fibers as

Round wires or round fibers or be designed as flat wires or flat fibers. The combination of two different materials for the first and second reinforcing structure has the advantage that the reinforcing element can be flexibly adapted to various required conditions for different applications of the medical catheter with regard to friction behavior, bending flexibility, kink resistance, in particular to strong curvatures in bifurcation, ovalization behavior or navigability ,

In a further embodiment, the at least one monofilament forms a helical turn or a tubular braid around the longitudinal axis of the catheter tube. By way of example, the monofilament can be formed as a wire mesh or braiding. It can be used for this purpose a single wire or more wires. The wire or wires may be braided or intertwined to form meshes. The meshes of the braid form a basic structure that enhances the mechanical properties of the fabric

Reinforcement largely determined and the braided

Supported multifilament bundle. The design as a braid has the advantage that the controllability, or navigability of the catheter can be improved, especially in bifurcations. By means of the wire mesh can advantageously be a torque transmission of a proximally initiated torque. Furthermore, the monofilament may be formed as a coil or spiral. In this case, the turn preferably extends helically or helically around the longitudinal axis of the inner lumen or catheter tube. The embodiment of a coil has the advantage that compared to the mesh, the diameter of the catheter wall thickness can be further significantly reduced. Particularly preferably, the reinforcing element is formed as a coil or braid with a braided polymer fiber bundle as a multifilament bundle. In this case, the winding direction of the braided multifilament bundle is different from the winding direction of the coil or the braid. In other words The multifilament bundle runs in a different direction than the coil or the braid.

Particularly preferably, the multifilament bundle is aligned parallel to the longitudinal axis of the catheter tube. In other words, that can

Multifilamentbündel axially, or be arranged longitudinally in the catheter tube. Accordingly, the multifilament bundle is preferably woven into the monofilament. In particular, the multifilament bundle is not above the

Monofilament out, so that the diameter of the reinforcing element is uniformly large at each point. The interweaving or weaving of the

Multifilament bundles in the monofilament has the advantage that the

Expansion stiffness of the reinforcing element can be increased.

In a further embodiment, the catheter is formed mehrlumig, wherein the reinforcing element forms a part of the wall of at least one inner lumen. By way of example, an inner circumference of the inner lumen can be replaced by a

be lined multilayer wall, whereby the wall is the

Inner lumen supports, thus preventing deformation of the inner lumen.

Preferably, the wall may be formed of three layers, wherein the inner layer, which is directly adjacent to the inner lumen of a

Reibmindernden material may be formed. On the inner layer, the reinforcing element may be arranged. On the reinforcing element, a third layer may be arranged, which in particular as a polymer layer

is trained. Advantageously, each inner lumen is assigned a reinforcing element. The multi-lumen design of the catheter comprises at least two inner lumens. This has the advantage that the catheter by means of several

Inner lumen can perform various functions, such as aspiration and infusion, simultaneously in a single device.

Particularly preferably, the reinforcing element extends over the entire length of the inner lumen. Concretely, the inner lumen can be completely lined by the reinforcing element. This is advantageous in order to provide the bending-resistant or kink-resistant properties of the catheter tube over all regions of the catheter tube.

In a further embodiment, the catheter has a diameter which is at most 8 Fr, in particular at most 7 Fr, in particular at most 6 Fr, in particular at most 5 Fr, in particular at most 4 Fr, in particular at most 3 Fr, in particular at most 2.5 Fr, in particular at most 2 Fr is. A catheter diameter of 6 Fr or 7 Fr or 8 Fr is particularly preferred. The monofilament and / or the multifilament bundle may have a braiding angle in relation to a projection of the longitudinal axis of the catheter tube into a

Form wall plane of the catheter tube. In other words, the pitch of the turns of the monofilament or the multifilament bundle is described by an angle which is between the monofilament or the

Multifilamentbündel and a longitudinal axis of the catheter tube extends, wherein the longitudinal axis is projected into the wall plane in which the monofilament or the multifilament bundle are arranged. Basically, that can

Monofilament and the multifilament have the same or different braiding angle. The braiding angle can be at rest, d. H. in the non-powered state, in particular in the straight extended state, the catheter tube at least 60 degrees, in particular at least 65 degrees, in particular at least 67.5 degrees, in particular at least 70 degrees, in particular at least 72.5 degrees. It is possible that the braiding angle is at most 85 degrees, in particular at most 82.5 degrees, in particular at most 80 degrees, in particular at most 77.5 degrees.

It is particularly preferred if the braiding angle of the monofilament and / or the multifilament bundle is between 75 degrees and 80 degrees.

The monofilament may be formed by a round wire or a flat wire. In a round wire, it is preferable if this one

Cross-sectional diameter between 30 μιτι and 70 μιτι, in particular 38 μιτι or 51 μιτι having. When using a flat wire dimensions have proven to be advantageous, the flat wire has a height between 20 μιτι and 30 μιτι, in particular 25 μιτι, and a width between 50 μιτι and 100 μιτι, in particular 75 μιτι having.

Preferably, the monofilament is made of a steel wire, in particular

Stainless steel wire, formed. In general it can be provided that the first reinforcing structure exclusively one monofilament or more monofilaments with the first winding direction and the second reinforcing structure exclusively

Multifilament bundles or more Mulitfilamentbündel with the second

Have winding direction. The single monofilament (s) and the single multifilament bundle (s)

Multifilament bundles are preferably intertwined with each other

different types of braids can be used. Thus, for example, a 1-over-1 weave or a 2-over-1 weave is possible, with 2

Monofilaments each cross a multifilament or cross.

In particular, it is provided in a preferred embodiment that a multifilament bundle crosses over two monofilaments, then undercuts two monofilaments and again crosses over the next two monofilaments. Two monofilaments running in parallel can cross over one multifilament bundle, undercut one subsequent multifilament bundle and one next

Cross the multifilament bundle again. Such a braiding pattern is preferred for an embodiment of the invention in which the catheter tube has twice as many monofilaments as multifilament bundles.

In the context of the application, furthermore, a medical system with a medical catheter according to one of the preceding embodiments is claimed, which further comprises an aspiration unit for aspirating substances from a blood vessel, which is connectable to the inner lumen of the medical catheter. The aspiration unit may be a suction device or a syringe. Furthermore, in the context of the application, a method for producing a medical catheter, in particular a medical catheter according to one of the preceding embodiments claimed, which a

Includes catheter tube having a reinforcing element. The

Reinforcing element comprises at least two reinforcing structures, wherein a first reinforcing structure is formed from at least one monofilament and a second reinforcing structure is formed from at least one multifilament bundle, wherein the multifilament bundle comprises a plurality of monofilaments which are pressed by means of an extruder and bundled by means of an electric field. The monofilaments may be exemplified by fibers be formed, which are produced via a method which the

Electrospinning is similar. This means that the monofilaments or fibers are pressed out via an extruder or a die. Due to the applied electric field, the monofilaments are bundled or drawn to a point and therefore form a multifilament bundle.

In a further preferred embodiment, the monofilaments are further processed after bundling. The trained multifilament bundle can be processed in such a way that advantageous material properties can be set. More preferably, the monofilaments are after bundling

surface-treated, in particular plasma-treated or dip-coated with subsequent UV curing, such that the monofilaments have hydrophobic or hydrophilic or adhesive or abrasion-resistant or anti-wicking properties after the treatment. The anti-wicking properties denote a lack of wicking of the formed coated

Multifilamentbündels. With a wicking will be general

Multifilament bundles referred to, which can transport liquid due to the surface properties by capillary action along the fiber.

By the surface treatment, advantageously any type of desired surface properties of the multifilament bundle can be adjusted to optimally accommodate different modes of operation of the catheter

guarantee. It is also conceivable that the biocompatibility or else the radiopacity of the multifilament bundle can be adjusted by means of the surface treatment. Further advantageous can be prevented by means of the surface treatment of a material fatigue.

In addition, the medical system and method may alternatively or additionally comprise a single or a combination of several features previously mentioned with respect to the medical catheter.

The invention will be explained in more detail below with further details with reference to the attached schematic drawings. Show in it

Fig. 1 is a detail view of a reinforcing element for a

medical catheter according to a first embodiment; Fig. 2 is a detail view of a reinforcing element for a

medical catheter according to another embodiment.

In the following description, the same reference numerals are used for identical and equivalent parts. Fig. 1 shows a detailed view of a reinforcing element 10 for a medical catheter, not shown, according to a first embodiment. In this case, the catheter may comprise a catheter tube, not shown, and at least one inner lumen 18, wherein the catheter tube, the reinforcing element 10 is associated. The reinforcing element 10 comprises two reinforcing structures 11, 12. A first reinforcing structure 11 is formed by a metallic braid 13. The braid 13 comprises two monofilaments 16. The monofilaments 16 are formed as wires, which are intertwined to form meshes in the braid 13. Preferred materials are stainless steel or a nickel-titanium alloy. The braid 13 may alternatively consist of a single wire as

Monofilament 16 may be formed, which is intertwined with itself.

The braid 13 forms a tubular body about a longitudinal axis of the inner lumen 18. Axially and longitudinally, a second reinforcing structure 12 is arranged. The second reinforcing structure 12 is formed by a multifilament bundle 17, or a bundle of individual synthetic fibers 15. The

Multifilament bundles 17 comprise a plurality of monofilaments or individual ones

Plastic fibers 15. By way of example, the bundle of para-aramid fibers is formed. The material of the bundle is different from the material of the braid 13.

The multifilament bundle 17 is interwoven with the braid 13. Specifically, the multifilament bundle 17 is woven into the braid 13. This shows that

Multifilament bundles 17 a different winding direction than the braid 13. In particular, the multifilament bundle 17 extends axially along the longitudinal axis of the reinforcing element 10 or of the inner lumen 18.

The multifilament bundle 17 has a planar arrangement. The individual plastic fibers 15 of the multifilament bundle lie parallel to one another and are arranged in the braiding plane. Thus, the thickness or the diameter the reinforcing element 10 and thus the catheter wall thickness are significantly reduced. The individual plastic fibers 15 of the

Multifilamentbündels 17 in direct contact with each other or in sections in adjacent loops of the braid 13th

be interwoven. The multifilament bundle 17 is designed in such a way that it is transferred in the braiding process with the braid 13 orthogonal to a bundle axis of a bundled arrangement in a planar arrangement.

The meshes of the braid 13 form a basic structure which largely determines the mechanical properties of the reinforcing element 10 and supports the braided multifilament bundle 17. The design as braid 13 has the advantage that the controllability, or navigability of the catheter can be improved, especially in bifurcations.

FIG. 2 shows a detailed view of a reinforcing element 10 for a medical catheter, not shown, according to a further exemplary embodiment. In this case, the catheter may comprise a catheter tube, not shown, and at least one inner lumen 18, wherein the catheter tube, the reinforcing element 10 is associated.

The reinforcing element 10 comprises two reinforcing structures 11, 12. A first reinforcing structure 11 is formed by a metallic coil 14. The coil 14 comprises a monofilament 16. The monofilament 16 is formed as a wire. Preferred materials are stainless steel or a nickel-titanium alloy.

The coil 14 forms a tubular body about a longitudinal axis of the

Inner lumen 18. The coil forms a helical turn. The winding extends helically around the longitudinal axis of the inner lumen 18 or

Catheter tube. The coil 14 has a first winding direction about the

Longitudinal axis. In a reverse winding direction is a second

Reinforcement structure 12 is arranged. The second reinforcing structure 12 is formed by a multifilament bundle 17, or a bundle of individual synthetic fibers 15. The bundle comprises several monofilaments or individual ones

Plastic fibers 15. By way of example, the bundle of para-aramid fibers is formed. The material of the bundle is different from the material of the coil 14. The multifilament bundle 17 is in an opposite winding direction with the coil 14 intertwined. In particular, the multifilament bundle 17 extends along the longitudinal axis of the reinforcing element 10 or of the inner lumen 18.

The multifilament bundle 17 has a planar arrangement. The individual plastic fibers 15 of the multifilament bundle 17 lie parallel to one another and are arranged in a common braiding plane with the coil 14. In other words, the coil 14 and the braided multifilament bundle 17 form a kind of braid. Thus, the thickness or the diameter of the

Reinforcement element 10 and thus the catheter wall thickness can be significantly reduced. The multifilament bundle 17 is designed such that in the braiding process with the coil 14 it is transferred orthogonal to a bundle axis from a bundled arrangement into a planar arrangement.

LIST OF REFERENCES

10 reinforcing element

11 first reinforcing structure

12 second reinforcing structure

13 metal mesh

14 coil

15 plastic fiber

16 monofilament

17 multifilament bundles

18 inner lumens

Claims

claims

Medical catheter having a catheter tube and at least one inner lumen (18), wherein a reinforcing element (10) is associated with the catheter tube,

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the reinforcing element (10) comprises at least two reinforcing structures (11, 12), wherein a first reinforcing structure (11) is formed from at least one monofilament (16) and a second reinforcing structure (12) is formed from at least one multifilament bundle (17) Monofilament (16) and the multifilament bundle (17) are intertwined and the monofilament (16) has a first winding direction and the multifilament bundle (17) has a second winding direction, wherein the first winding direction is different from the second winding direction.

A medical catheter according to claim 1,

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the multifilament bundle (17) is designed in such a way that, during a braiding operation with the monofilament (16), it can be transferred orthogonally to a bundle axis from a bundled arrangement into a planar arrangement.

A medical catheter according to any one of the preceding claims, characterized in that

the first reinforcing structure (11) comprises a first material, in particular a metal, and the second reinforcing structure (12) comprises a second material, in particular a plastic, wherein the first material is different from the second material. 4. Medical catheter according to one of the preceding claims,

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the at least one monofilament (16) forms a helical turn or a tubular braid about the longitudinal axis of the catheter tube. 5. Medical catheter according to one of the preceding claims,

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the multifilament bundle (17) at least in sections parallel to

Longitudinal axis of the catheter tube is aligned and / or that the catheter is formed mehrlumig, wherein the

Reinforcing element (10) has a part of the wall of at least one

Inner lumen (18) forms.

Medical catheter according to one of the preceding claims, characterized in that

the reinforcing element (10) over the entire length of

Inner lumen (18) extends.

the catheter has a diameter which is at most 8 Fr, in particular at most 7 Fr, in particular at most 6 Fr, in particular at most 5 Fr, in particular at most 4 Fr, in particular at most 3 Fr, in particular at most 2.5 Fr, in particular at most 2 Fr.

the monofilament (16) and / or the multifilament bundle (17) one

Braid angle relative to a projection of the longitudinal axis of the

Catheter tube in a wall plane of the catheter tube which is at least 60 degrees, in particular at least 65 degrees, in particular at least 67.5 degrees, in particular at least 70 degrees, in particular at least 72.5 degrees,

and or

is at most 85 degrees, in particular at most 82.5 degrees, in particular at most 80 degrees, in particular at most 77.5 degrees

Medical catheter according to claim 8,

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

the braiding angle is between 75 degrees and 80 degrees.

the monofilament (16) is formed by a round wire or a flat wire, wherein the round wire is preferably a

Cross-sectional diameter between 30 μιτι and 70 μιτι, in particular 38 μιτι or 51 μιτι, and the flat wire preferably a height between 20 μιτι and 30 μιτι, in particular 25 μιτι, and a width between 50 μιτι and 100 μιτι, in particular 75 μιτι have.

11. Medical catheter according to one of the preceding claims,

dad u rch nets that net

the first reinforcing structure exclusively one monofilament or more monofilaments with the first winding direction and the second

Reinforcement structure exclusively a multifilament bundle or more Multifilamentbündel having the second winding direction.

12. A medical system with a medical catheter according to one of the preceding claims and an aspiration unit for aspirating substances from a blood vessel, which is connectable to the inner lumen of the medical catheter.

13. A method for producing a medical catheter, in particular a medical catheter according to one of claims 1 to 12, with a catheter tube, which has a reinforcing element (10), as delt ech net that

the reinforcing element (10) comprises at least two reinforcing structures (11, 12), wherein a first reinforcing structure (11) is formed from at least one monofilament (16) and a second reinforcing structure (12) is formed from at least one multifilament bundle (17) Multifilamentbündel (17) has a plurality of monofilaments (16) which are pressed by means of an extruder and bundled by means of an electric field.

14. The method according to claim 13,

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the monofilaments (16) are further processed after bundling.

15. The method according to claim 14,

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the monofilaments (16) are surface-treated after bundling, in particular plasma-treated or dip-coated with subsequent UV curing, such that the monofilaments (16) after the Treatment have hydrophobic or hydrophilic or adhesive or abrasion resistant or anti-wicking properties.