Method for preparation of a self-expanding stent for a medical device to be introduced into a cavity of a body
First Claim
1. A method for preparing a self-expanding stent, comprising:
- a) supplying each reel of a first and second plurality of interposed reels with multiple filaments wound adjacently side by side on the reel, whereby both pluralities have reels with adjacent side by side multiple filaments;
b) revolving a first plurality of said interposed reels in a first circumferential direction in a first planetary path about a longitudinal axis, and revolving a second plurality of said interposed reels in a second planetary path about said longitudinal axis in a second circumferential direction opposite to said first direction so as to form a tubular body about said longitudinal axis, said tubular body being radially expansible and retractable between a first diameter, corresponding to a compressed state of the stent, and a second diameter, greater than said first diameter, corresponding to a resting state of the stent, and is axially is expansible and retractable between a first length, corresponding to said compressed state, and a second length, less than said first length, corresponding to said resting state, wherein said revolving comprises winding a first plurality of multiple filaments along a first helicoid direction about the longitudinal axis and winding a second plurality of multiple filaments along a second helicoid direction opposite to said first helicoid direction, each multiple filament wound in one of said helicoid directions crossing multiple filaments wound in the other helicoid direction in an over-under manner.
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Abstract
A self-expanding stent for a medical device to be introduced into a cavity of a human body, is disclosed and includes a radially expandable and axially retractable tubular body (1), characterized in that the tubular body comprises first flexible rigid filaments (2, 3) which are arranged side by side in a number at least equal to two, wound along a first helicoid direction around a longitudinal axis (4) of the tubular body, and second flexible rigid filaments (5, 6) which are arranged side by side in a number at least equal to two, wound along a second helicoid direction opposite to the first, each multiple filament wound in one of the said directions crossing multiple filaments wound in the other direction according to a plaited arrangement. Methods for reproducibly forming the stent of the invention are disclosed.
158 Citations
6 Claims
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1. A method for preparing a self-expanding stent, comprising:
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a) supplying each reel of a first and second plurality of interposed reels with multiple filaments wound adjacently side by side on the reel, whereby both pluralities have reels with adjacent side by side multiple filaments;
b) revolving a first plurality of said interposed reels in a first circumferential direction in a first planetary path about a longitudinal axis, and revolving a second plurality of said interposed reels in a second planetary path about said longitudinal axis in a second circumferential direction opposite to said first direction so as to form a tubular body about said longitudinal axis, said tubular body being radially expansible and retractable between a first diameter, corresponding to a compressed state of the stent, and a second diameter, greater than said first diameter, corresponding to a resting state of the stent, and is axially is expansible and retractable between a first length, corresponding to said compressed state, and a second length, less than said first length, corresponding to said resting state, wherein said revolving comprises winding a first plurality of multiple filaments along a first helicoid direction about the longitudinal axis and winding a second plurality of multiple filaments along a second helicoid direction opposite to said first helicoid direction, each multiple filament wound in one of said helicoid directions crossing multiple filaments wound in the other helicoid direction in an over-under manner. - View Dependent Claims (2, 3, 4, 5, 6)
said tubular body is first revolved at a third diameter greater than said second diameter and then axially expanded so that it reaches said second diameter, and said tubular body is treated when axially expanded with said second diameter so that it maintains said second diameter in said resting state.
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3. A method according to claim 2, wherein:
said tubular body is axially expanded so that it reaches said second diameter by introducing said tubular body into a tube having an internal diameter substantially corresponding to said second diameter.
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4. A method according to claim 3, wherein:
after introduction of said tubular body into said tube, at least one end of said tubular body protrudes from said tube and flares, and said tubular body with said flare is treated by heating said tubular body to an elevated temperature and holding said tubular body at said elevated temperature for a period of time.
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5. A method according to claim 1, wherein:
said tubular body is treated by heating said tubular body to an elevated temperature and holding said tubular body at said elevated temperature for a period of time.
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6. A method according to claim 1, wherein:
after said revolving, placing said tubular body over a mandrel of suitable shape, applying tension to the ends of said tubular body in order to apply said tubular body onto said mandrel, thermally treating said tubular body in order to fix and set it so that, after said the thermal treatment, said tubular body has, in said resting state, the shape of the mandrel.
Specification