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US 9,039,726 B2Granted
Filamentary devices for treatment of vascular defects
AssigneeCovidien LP
InventorFrank P. Becking
Life of this patent
Estimating the term…
Abstract
Braid-balls suitable for aneurysm occlusion and/or parent vessel occlusion/sacrifice (e.g., in treating neurovascular defects) are disclosed. Especially for aneurysm treatment, but also for either one of the aforementioned treatments, the form of the ball is very important. In particular, the density of the device is paramount in applications where braid itself is intended to moderate or stop blood flow—allowing thrombosis within a volume formed by the ball.
Claims21
A device for treatment of a patient's vasculature, comprising:
- a self-expanding resilient permeable shell having a proximal portion, a distal portion, a longitudinal axis and further comprising:
- a plurality of elongate resilient filaments with a woven structure secured relative to each other at the proximal and distal portions thereof, the filaments (i) radially converging to a first cross-section at each of the proximal and distal portions to form respective proximal and distal filament tufts, and (ii) radially diverging from the first cross-section to a second cross-section, larger than the first cross-section, such that free ends of the filaments flare outwardly within the shell for promoting thrombosis of blood;
- a radially constrained elongated state configured for delivery within a microcatheter with the thin woven filaments extending longitudinally from the proximal portion to the distal portion radially adjacent each other along a length of the filaments;
- and
- an expanded relaxed state with a globular and longitudinally shortened configuration relative to the radially constrained state with the woven filaments forming the self-expanding resilient permeable shell in a smooth path radially expanded from the longitudinal axis between the proximal portion and distal portion including a plurality of openings in the shell formed between the woven filaments, the largest of said openings being configured to allow blood flow through the openings at a velocity below a thrombotic threshold velocity.
2 more elements
A delivery system for deployment of a device for treatment of a patient's vasculature, comprising:
- a microcatheter having an inner lumen extending a length thereof;
- a device for treatment of a patient's vasculature disposed within the inner lumen of the microcatheter and comprising a self-expanding resilient permeable shell of thin filaments, the permeable shell having a proximal portion, a distal portion, a longitudinal axis, a radially constrained elongated state, and an expanded state;
- wherein in the constrained state, the device is configured for delivery within a microcatheter with the thin woven filaments extending longitudinally from the proximal portion to the distal portion radially adjacent each other, and
- wherein in the expanded state, the filaments of the proximal and distal portions (i) radially converge to a first cross-section at each of the proximal and distal portions to form respective proximal and distal filament tufts, and (ii) radially diverge from the first cross-section to a second cross-section, larger than the first cross-section, such that free ends of the filaments flare outwardly within the shell for promoting thrombosis of blood, the device having, in the expanded state, a globular and axially shortened configuration relative to the constrained state with the woven filaments forming the self-expanding resilient permeable shell in a smooth path radially expanded from the longitudinal axis between the proximal portion and distal portion and a plurality of openings in the shell formed between the woven filaments, the permeable shell further having a portion when in the expanded relaxed state that is configured to span an opening of a patient's vascular defect;
- and
- an elongate delivery apparatus having a proximal end and a distal end releasably secured to a proximal hub of the device.
3 more elements
Dependencies are inferred from the claim text.