Conical stent
First Claim
Patent Images
1. A stent for use in a body passageway comprising:
- a flexible self-expandable braided tubular wall having a longitudinal axis, the tubular wall comprising a first proximal segment adapted to provide a sufficiently high radial force to prevent migration of the stent in a body passageway, a proximal end, a distal end, and a first outer diameter, the proximal end of the first proximal segment terminating at a first free end of the stent;
a second distal segment having a proximal end, a distal end, and a second outer diameter smaller than the first outer diameter of the first proximal segment, the distal end of the second distal segment terminating at a second free end of the stent; and
a third intermediate segment having a proximal end connected to the distal end of the first segment and a distal end connected to the proximal end of the second distal segment;
wherein the braided tubular wall includes braiding with a varying steep angle with respect to the longitudinal axis of the tubular wall and wherein the radial force and flexibility over at least a portion of the flexible self-expandable braided tubular wall are not constant and wherein at least one of the first free end and the second free end is flared in a radial direction.
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Abstract
The stent comprises a flexible self-expandable braided tubular wall having a proximal segment having an outer diameter, and a distal segment having an outer diameter smaller than the outer diameter of the proximal segment. An intermediate segment is formed between proximal and distal segments, which forms a truncated cone of which the base is forming the proximal end of the intermediate segment and of which the top is forming the distal end of the intermediate segment. A covering layer is arranged within the tubular wall.
154 Citations
26 Claims
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1. A stent for use in a body passageway comprising:
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a flexible self-expandable braided tubular wall having a longitudinal axis, the tubular wall comprising a first proximal segment adapted to provide a sufficiently high radial force to prevent migration of the stent in a body passageway, a proximal end, a distal end, and a first outer diameter, the proximal end of the first proximal segment terminating at a first free end of the stent;
a second distal segment having a proximal end, a distal end, and a second outer diameter smaller than the first outer diameter of the first proximal segment, the distal end of the second distal segment terminating at a second free end of the stent; and
a third intermediate segment having a proximal end connected to the distal end of the first segment and a distal end connected to the proximal end of the second distal segment;
wherein the braided tubular wall includes braiding with a varying steep angle with respect to the longitudinal axis of the tubular wall and wherein the radial force and flexibility over at least a portion of the flexible self-expandable braided tubular wall are not constant and wherein at least one of the first free end and the second free end is flared in a radial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A stent for use in a body passageway comprising:
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a flexible self-expandable braided tubular wall having a longitudinal axis, the tubular wall comprising a first proximal anchor segment adapted to provide a sufficiently high radial force to prevent migration of the stent in a body passageway, a proximal end, a distal end, and a first outer diameter, the proximal end of the first proximal anchor segment terminating at a first free end of the stent;
a second distal segment having a proximal end, a distal end, and a second outer diameter smaller than the first outer diameter of the first proximal anchor segment, the distal end of the second distal segment terminating at a second free end of the stent; and
a third intermediate segment including a plurality of consecutive truncated cones connected to one another, each of the truncated cones having a taper oriented towards the distal end of the intermediate segment, the third intermediate segment having a proximal end connected to the distal end of the first segment and a distal end connected to the proximal end of the second distal way-making segment;
wherein the braided tubular wall includes braiding with a varying steep angle with respect to the longitudinal axis of the tubular wall and wherein the radial force and flexibility over at least a portion of the flexible self-expandable braided tubular wall is not constant. - View Dependent Claims (13)
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14. A method for manufacturing a stent comprising:
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(a) forming an elongated mandrel, the elongated mandrel including;
(1) a first proximal segment having a proximal end, a distal end, and a first outer diameter;
(2) a second distal segment having a proximal end, a distal end, and a second outer diameter smaller than the first outer diameter; and
(3) a third intermediate segment having a proximal end connected to the distal end of the first segment and a distal end connected to the proximal end of the second segment;
(b) forming an elongated tubular braid having a proximal end, distal end, and an inner diameter greater than the first outer diameter of the first proximal segment of the elongated mandrel;
(c) engaging the tubular braid over the mandrel;
(d) heating the tubular braid over the mandrel; and
(e) pulling the proximal and distal ends of the tubular braid away from one another to closely radially contract the tubular braid over the segments of the mandrel during heating of the tubular braid. - View Dependent Claims (15, 16)
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17. A method for manufacturing a stent comprising:
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(a) forming an elongated tubular mandrel, the elongated tubular mandrel including;
(1) a first proximal hollow segment having a proximal end, a distal end, and a first inner diameter;
(2) a second distal hollow segment having a proximal end, a distal end, and a second inner diameter smaller than the first inner diameter; and
(3) a third intermediate hollow segment having a proximal end connected to the distal end of the first hollow segment and a distal end connected to the proximal end of the second hollow segment;
(b) forming an elongated tubular braid having a proximal end, a distal end, and an outer diameter greater than the first inner diameter of the first hollow segment of the tubular mandrel;
(c) pulling the proximal and distal ends of the elongated tubular braid away from one another to radially contract the tubular braid;
(d) engaging the contracted tubular braid into the tubular mandrel;
(e) releasing the pull on the ends of the tubular braid to radially expand the tubular braid in the mandrel; and
(f) heating the tubular braid in the mandrel to closely radially expand the tubular braid against the segments of the tubular mandrel. - View Dependent Claims (18, 19)
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20. A body insertable stent, including:
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a flexible self-expandable braided tubular wall comprising a proximal segment having a proximal segment diameter adapted to provide a sufficiently high radial force to prevent a migration of the stent in a body passageway, a proximal end of the proximal segment terminating at a first free end of the tubular wall;
a distal segment having a distal segment outer diameter less than the proximal segment outer diameter, a distal end of the distal segment terminating at a second free end of the tubular wall; and
an intermediate segment of the tubular wall disposed between the proximal and distal segments, and incorporating at least one truncated cone having a taper oriented toward the distal segment;
wherein the intermediate segment, along the at least one truncated cone, includes braiding with a steep angle that varies with respect to a longitudinal axis of the tubular wall, and wherein a radial force and flexibility of the tubular wall vary along the at least one truncated cone. - View Dependent Claims (21, 22, 23, 24)
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25. A method for manufacturing a stent comprising:
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(a) forming an elongated mandrel having a first proximal segment having proximal and distal ends and a first outer diameter, a second distal segment having proximal and distal ends and a second outer diameter smaller than said first outer diameter, and a third intermediate segment having a proximal end connected to the distal end of the first segment and a distal end connected to the proximal end of the second segment;
(b) forming an elongated tubular braid of spring steel having proximal and distal ends and an inner diameter greater than said first outer diameter of the first segment of the mandrel;
(c) engaging said tubular braid over said mandrel;
(d) heating the tubular braid over the mandrel; and
,(e) pulling during said heating the proximal and distal ends of the tubular braid away from one another on the mandrel to closely radially contract the tubular braid over the segments of said mandrel.
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26. A method for manufacturing a stent comprising:
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(a) forming an elongated tubular mandrel having a first proximal hollow segment having proximal and distal ends and a first inner diameter, a second distal hollow segment having proximal and distal ends and a second inner diameter smaller than said first inner diameter, and a third intermediate hollow segment having a proximal end connected to the distal end of the first hollow segment and a distal end connected to the proximal end of the second hollow segment;
(b) forming an elongated tubular braid of spring steel having proximal and distal ends and an outer diameter greater than the first inner diameter of the first hollow segment of the tubular mandrel;
(c) pulling the proximal and distal ends of the elongated tubular braid away from one another to radially contract the tubular braid;
(d) engaging the contracted tubular braid into the tubular mandrel;
(e) releasing the pull on the ends of the tubular braid to radially expand it in the mandrel; and
,(f) heating the tubular braid in the mandrel to closely radially expand the tubular braid against the segments of the tubular mandrel.
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Specification