STENT

Abstract

The invention relates to a stent having a tubular woven structure (3) formed from wire strands (1, 2) interwoven with one another, wherein at least one first wire strand (1) is formed by at least two individual wires (1.1, 1.2) which run adjacently and contact one another, wherein the first wire strand (1) winds helically in a first direction around an axis of rotation of the woven structure (3) and crosses at least one second wire strand (2), which comprises at least one individual wire (2.1) and winds helically in a second direction around the axis of rotation of the woven structure (3), and wherein at least one individual wire (1.1) of the first wire strand (1) comprises an X-ray visible core material which is encased by a sheath material having a lower X-ray visibility than the core material.

Claims

1. A stent having a tubular woven structure (3) formed from wire strands (1, 2) interwoven with one another, wherein at least one first wire strand (1) is formed by at least two individual wires (1.1, 1.2) which run adjacently and contact one another, wherein the first wire strand (1) winds helically in a first direction around an axis of rotation of the woven structure (3) and crosses at least one second wire strand (2), which comprises at least one individual wire (2.1) and winds helically in a second direction around the axis of rotation of the woven structure (3), and wherein at least one individual wire (1.1) of the first wire strand (1) comprises an X-ray visible core material which is encased by a sheath material having a lower X-ray visibility than the core material.

2. The stent according to claim 1, characterised in that at least two, in particular both individual wires (1.1, 1.2) of the first wire strand (1) comprise an X-ray visible core material which is encased by a sheath material having a lower X-ray visibility than the core material.

3. The stent according to claim 1 or 2, characterised in that all individual wires (1.1, 1.2) of the first wire strand (1) comprise an X-ray visible core material which is encased by a sheath material having a lower X-ray visibility than the core material.

4. The stent according to any one of the preceding claims, characterised in that the individual wires (1.1, 1.2) of all wire strands (1, 2) comprise an X-ray visible core material which is encased by a sheath material having a lower X-ray visibility than the core material.

5. The stent according to any one of the preceding claims, characterised in that the woven structure (3) has a conical or cylindrical outer contour.

6. The stent according to any one of the preceding claims, characterised in that the wire strands (1, 2) form a deflection at a longitudinal end of the woven structure, wherein the wire strands (1, 2) are wound in a first direction around the longitudinal axis of the woven structure (3) before the deflection (4), and wherein the wire strands (1, 2) are wound in a second direction around the longitudinal axis of the woven structure (3) after the deflection (4).

7. The stent according to any one of the preceding claims, characterised in that the sheath material comprises a shape-memory material, in particular a nickel-titanium alloy.

Description

[0021] The accompanying drawings show the following:

[0022] FIG. 1 shows a side view of a stent in accordance with a preferred exemplary embodiment of the present invention;

[0023] FIG. 2 shows a detailed view of a middle portion of the woven structure of the stent according to FIG. 1;

[0024] FIG. 3 shows a detailed view of an end portion of the woven structure of the stent according to FIG. 1; and

[0025] FIG. 4 shows a perspective partial view of the stent according to FIG. 1 with a transport wire for feeding the stent into a blood vessel.

[0026] The reference numerals in the drawings are associated with the following components/elements of the invention: [0027] 1 denotes a first wire strand of the woven structure [0028] 2 denotes a second wire strand of the woven structure, [0029] 1.1 denotes a first individual wire formed as DFT wire [0030] 1.2 denotes a second individual wire formed as DFT wire, [0031] 3 denotes the woven structure, [0032] 4 denotes a deflection or end loop, [0033] 5 denotes a transport wire, and [0034] 6 denotes a flexible, curved tip of the transport wire.