Medical stent with variable coil and related methods
First Claim
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1. A medical stent comprising:
- a first section defining a lumen and comprising a first coil completing more than one revolution, the first section comprising a first material having a first durometer value, wherein the first coil revolves about and is coaxial with an axis and wherein a distance from a first point to the axis, the first point at the center of a first cross-section of the first coil and on a line normal to the axis, is less than a distance from a second point to the axis, the second point at the center of a second cross-section of the first coil and on a line normal to the axis, the first point being closer to an origin of the first coil than the second point;
a second section defining a lumen and comprising a second coil completing at least one revolution, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and
the third section defining a lumen and located between the first and second sections and adjacent the origin of the first coil, at least a portion of the third section comprising a coextrusion of the first and second materials.
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Abstract
A medical stent includes a first section which includes a first material, defines a lumen, and includes a first coil completing more than one revolution. The first coil revolves about and is coaxial with an axis, expanding and opening as it revolves from the origin of the first coil. A second section of the stent includes a second material, defines a lumen, and includes a second coil completing at least one revolution. A third section defines a lumen and is located between the first and second sections. The third section includes a co-extrusion of the first and second materials. One of the first or second sections is harder than the other section.
427 Citations
19 Claims
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1. A medical stent comprising:
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a first section defining a lumen and comprising a first coil completing more than one revolution, the first section comprising a first material having a first durometer value, wherein the first coil revolves about and is coaxial with an axis and wherein a distance from a first point to the axis, the first point at the center of a first cross-section of the first coil and on a line normal to the axis, is less than a distance from a second point to the axis, the second point at the center of a second cross-section of the first coil and on a line normal to the axis, the first point being closer to an origin of the first coil than the second point;
a second section defining a lumen and comprising a second coil completing at least one revolution, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and
the third section defining a lumen and located between the first and second sections and adjacent the origin of the first coil, at least a portion of the third section comprising a coextrusion of the first and second materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for placing a medical stent comprising:
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inserting a medical stent into a ureter, the medical stent comprising;
a first section defining a lumen and comprising a first coil completing more than one revolution, the first section comprising a first material having a first durometer value, wherein the first coil revolves about and is coaxial with an axis and wherein a distance from a first point to the axis, the first point at the center of a first cross-section of the first coil and on a line normal to the axis, is less than a distance from a second point to the axis, the second point at the center of a second cross-section of the first coil and on a line normal to the axis, the first point being closer to an origin of the first coil than the second point;
a second section defining a lumen and comprising a second coil completing at least one revolution, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and
the third section defining a lumen and located between the first and second sections and adjacent the origin of the first coil, at least a portion of the third section comprising a co-extrusion of the first and second materials. - View Dependent Claims (16, 17)
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18. A medical stent comprising:
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a first section defining a lumen and comprising a substantially planar first coil completing more than one revolution, the first section comprising a first material having a first durometer value;
a second section defining a lumen and comprising a second coil completing at least one revolution, the second coil being generally perpendicular to the first coil, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and
a third section defining a lumen and located between the first and second sections, at least a portion of the third section comprising a co-extrusion of the first and second materials.
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19. A method for placing a medical stent comprising:
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inserting a medical stent into a ureter, the medical stent comprising;
a first section defining a lumen and comprising a substantially planar first coil completing more than one revolution, the first section comprising a first material having a first durometer value;
a second section defining a lumen and comprising a second coil completing at least one revolution, the second coil being generally perpendicular to the first coil, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and
a third section defining a lumen and located between the first and second sections, at least a portion of the third section comprising a co-extrusion of the first and second materials.
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Specification