OCCLUSION DEVICE
First Claim
1. A medical device for placement within a body vessel for providing vessel occlusion, the device comprising:
- a support structure having proximal and distal ends and defining a longitudinal axis therebetween, wherein the support structure is biased toward a nominal state having a radial expanded and longitudinally shortened configuration and extendable from the nominal position to a lengthened state having a radially reduced and longitudinally lengthened configuration;
at least one layer of nonwoven electrospun fibers attached to and encapsulating the support structure; and
wherein the electrospun fibers comprise a mixture of Polyethylene Terephthalate (PET) solution and Ultra High Molecular Weight Polyethylene (UHMWPE) micro-particles.
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Accused Products
Abstract
An occlusion device for placement within a body vessel may include a wire constructed support structure having a covering applied thereto. The covering includes a mixture of PET and ultra-high molecular weight polyethylene (UHMWPE). The covering is applied to the support structure via an electrospinning process to produce a non-woven fiber covering having increase strain capabilities relative to an electrospun PET covering without UHMWPE. The device has a nominal state that is radially expanded and a delivery state that is radially compressed and longitudinally extended for disposal within a low-profile delivery sheath. The covering increased strain capability allows for the device to have relative large diameter in the nominal state while still being capable of low-profile delivery. This occlusion device can provide faster occlusive capability when deployed and does not rely on delayed embolization. The covering extends across the vessel upon deployment to provide instant occlusion.
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Citations
20 Claims
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1. A medical device for placement within a body vessel for providing vessel occlusion, the device comprising:
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a support structure having proximal and distal ends and defining a longitudinal axis therebetween, wherein the support structure is biased toward a nominal state having a radial expanded and longitudinally shortened configuration and extendable from the nominal position to a lengthened state having a radially reduced and longitudinally lengthened configuration; at least one layer of nonwoven electrospun fibers attached to and encapsulating the support structure; and wherein the electrospun fibers comprise a mixture of Polyethylene Terephthalate (PET) solution and Ultra High Molecular Weight Polyethylene (UHMWPE) micro-particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for coating a support structure with a non-woven electrospun material, the method comprising:
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attaching a support structure to a conductive mandrel; rotating the mandrel; applying a mixture of ultra high molecular weight polyethylene (UHMWPE) microparticles and Polyethylene Terephthalate (PET) solution to the support structure by electrospinning; and coating the support structure with non-woven electrospun fibers produced by electrospinning the mixture to produce at least one layer of non-woven electrospun fibers.
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- 15. The method of claim 15, wherein the at least one layer comprises a first layer and second layer, and the first layer and second layer are provided in a first coating step and a second coating step.
- 16. The method of claim 16, further comprising applying a TiO2/SiO2 solution to at least one of the first layer and the second layer, wherein the applying step is performed between the first and second coating steps.
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20. The method of claim 21, wherein the mixture includes about 4%-10% UHMWPE microparticles in suspension and the remainder comprises the PET solution.
Specification