Vascular stent
First Claim
Patent Images
1. A stent having a longitudinal axis comprising:
- a continuous filament shaped into a waveform pattern having a plurality of substantially straight legs connected by U-shaped bends, consecutive ones of said straight legs varying in length, said waveform pattern being spirally wrapped about said axis to define a cylindrical surface in which a plurality of said U-shaped bends are in tangential contact;
said straight legs being substantially parallel to said longitudinal axis when the stent is in a radially compressed state;
said U-shaped bends being substantially bisected by said longitudinal axis; and
a plurality of pairs of said U-shaped bends that are in tangential contact being attached together in a non-overlapping manner so that said cylindrical surface includes a plurality of rhomboidal cells bounded on all four sides by said substantially straight legs.
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Abstract
A vascular stent for reducing hemodynamic disturbances caused by angioplasty. The stent is formed from a single filament of low memory biocompatible material having a series of U-shaped bends. The filament is wrapped around a mandril, in a circular fashion, in order to align the curved portions of each bend which may then be connected. The stent provides a maximum amount of structural support for the lumen while minimizing hemodynamic disturbances inside the lumen.
434 Citations
14 Claims
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1. A stent having a longitudinal axis comprising:
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a continuous filament shaped into a waveform pattern having a plurality of substantially straight legs connected by U-shaped bends, consecutive ones of said straight legs varying in length, said waveform pattern being spirally wrapped about said axis to define a cylindrical surface in which a plurality of said U-shaped bends are in tangential contact; said straight legs being substantially parallel to said longitudinal axis when the stent is in a radially compressed state; said U-shaped bends being substantially bisected by said longitudinal axis; and a plurality of pairs of said U-shaped bends that are in tangential contact being attached together in a non-overlapping manner so that said cylindrical surface includes a plurality of rhomboidal cells bounded on all four sides by said substantially straight legs. - View Dependent Claims (2, 3)
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4. A stent having a longitudinal axis comprising:
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a continuous filament shaped into a waveform pattern having a plurality of substantially straight legs connected by U-shaped bends, consecutive ones of said straight legs varying in length, said waveform pattern being wrapped about said axis to define a cylindrical surface; and a plurality of pairs of said U-shaped bends being attached together in a non-overlapping manner so that said cylindrical surface includes a plurality of rhomboidal cells bounded on all four sides by said substantially straight legs. - View Dependent Claims (5, 6, 7, 8)
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9. A stent having a longitudinal axis comprising:
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a continuous filament shaped into a waveform pattern having a plurality of substantially straight legs connected by U-shaped bends, consecutive ones of said straight legs varying in length, said waveform pattern being spirally wrapped about said axis to define a cylindrical surface; said straight legs being substantially parallel to said longitudinal axis when the stent is in a radially compressed state; and said U-shaped bends being substantially bisected by said longitudinal axis. - View Dependent Claims (10, 11, 12, 13)
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14. A method of forming a stent comprising the steps of:
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forming a continuous filament into a waveform pattern having a plurality of substantially straight legs connected by U-shaped bends, consecutive ones of said straight legs alternating in length; wrapping the waveform pattern around a cylindrical mandrel so that some of the U-shaped bends are arranged back to back in tangential contact; and connecting in a non-overlapping manner at least some of the U-shaped bends in tangential contact.
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Specification