Stent construction of rolled configuration
First Claim
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1. A stent assembly for placement in a body passage to reinforce a damaged wall in the passage, comprising:
- an elongated core;
an elongated, flexible sheet arranged on said core in a multiple layer roll having expanded and contracted conditions and having a spring force so that said sheet is urged toward the expanded condition, said roll being tightly wound on the core in the contracted condition and presenting in the expanded condition a diameter at least equal to the diameter of the body passage.said roll being spirally wound on said core and having a tendency to radially expand, said roll presenting a plurality of adjacent, arcuate layers of said sheet in a direction transverse to the longitudinal axis of said core;
releasable means for retaining said roll in the contracted condition on said core while the core is being inserted into the passage to the location of the damaged walls; and
means for effecting release of said releasable means to permit the roll to expand against the damaged wall in the expanded condition of the roll,said roll in the expanded condition thereof having at least two overlapping layers which overlap and bear against one another over a substantial portion of the circumference of a inner layer, said expanded roll adapted for securely contacting said damaged wall by virtue of said radial expansion tendency.
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Abstract
A stent for reinforcing a damaged wall in a body passage such as a vascular passage. The stent takes the form of a sheet of metal foil wound tightly around a spool in a multiple layer roll and held in a contracted state by a sheath sleeved around the roll. The spool is inserted into the body passage until the stent is adjacent to the area of the damaged wall. The spool and stent are then advanced while the sheath is held stationary. This pushes the stent out the end of the sheath and releases the stent such that the roll unwinds and expands against the damaged vessel wall.
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Citations
17 Claims
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1. A stent assembly for placement in a body passage to reinforce a damaged wall in the passage, comprising:
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an elongated core; an elongated, flexible sheet arranged on said core in a multiple layer roll having expanded and contracted conditions and having a spring force so that said sheet is urged toward the expanded condition, said roll being tightly wound on the core in the contracted condition and presenting in the expanded condition a diameter at least equal to the diameter of the body passage. said roll being spirally wound on said core and having a tendency to radially expand, said roll presenting a plurality of adjacent, arcuate layers of said sheet in a direction transverse to the longitudinal axis of said core; releasable means for retaining said roll in the contracted condition on said core while the core is being inserted into the passage to the location of the damaged walls; and means for effecting release of said releasable means to permit the roll to expand against the damaged wall in the expanded condition of the roll, said roll in the expanded condition thereof having at least two overlapping layers which overlap and bear against one another over a substantial portion of the circumference of a inner layer, said expanded roll adapted for securely contacting said damaged wall by virtue of said radial expansion tendency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for reinforcing a damaged wall of a body passage, comprising:
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an elongated core; an elongated stent in the form of a flexible sheet spirally wound around the core in a multiple layer roll having contracted and expanded conditions, said sheet being wound tightly on the core in the contracted condition and having a spring force which tends to radially expand toward the expanded condition thereof wherein the sheet assumes a size to contact the damaged wall, and said roll presenting a plurality of adjacent, arcuate layers of said sheet in a direction transverse top the longitudinal axis of the core; a sheath fitting closely around said roll to hold the sheet in the contracted condition, said sheath being movable axially relative to the roll to permit the sheath to release from the roll and thereby allow expansion of the sheet against the damaged wall in the expanded condition, said roll in the expanded condition thereof having at least two overlapping layers, which overlap and bear against one another over a substantial portion of the circumference of the inner layer, said expanded roll adapted for securely contracting said damaged wall by virtue of said radial expansion tendency of the roll. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification