Bioresorbable vascular implant having homogenously distributed stresses under a radial load
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Publication Number
US-9566177-B2
Publication Date
2017-02-14
Expiration Date
Abstract
A bioresorbable vascular implant for implantation in a bodily lumen has a tubular framework and includes one or more annular support members. Each of the one or more annular support members includes a plurality of struts interconnected by a hinge region. Each of the plurality of struts also includes a mid-section. The vascular implant also includes at least one viscoelastic material that enables transition of the vascular implant between a collapsed configuration and an expanded configuration. Each of the plurality of struts and the hinge region defines a cross-section. The moment of inertia increases from the mid-section towards the hinge region to accommodate the transition and resist a radial load applied to the vascular implant in the expanded configuration.
Core Innovation
The described invention provides a bioresorbable vascular implant having a tubular framework for implantation in a bodily lumen. The implant includes one or more annular support members, where each annular support member has a plurality of struts interconnected by a hinge region having a width, and each strut has a mid-section having a width. The implant is comprised of at least one viscoelastic material that enables transition between a collapsed configuration and an expanded configuration.
The moment of inertia increases from each mid-section towards each hinge region to accommodate the transition and resist a radial load applied in the expanded configuration. The width of each strut tapers substantially continuously from each hinge region to each mid-section, and stresses between the mid-section and the hinge region are evenly distributed under application of the radial load to the implant in the expanded configuration.
In further embodiments, at least one cross-strut intersects the one or more annular support members. In such embodiments, the cross-strut is subject to degradation performance such that it breaks in less than about 90 days due to degradation of the viscoelastic material comprising the cross-strut following implantation in the bodily lumen, and the invention is described as configured for use in an angioplasty procedure.
Claims Coverage
The provided independent claims share a common set of inventive features centered on a bioresorbable vascular implant with viscoelastic transition between collapsed and expanded configurations, hinge/mid-section cross-section mechanics, increasing moment of inertia toward hinge regions, substantially continuous tapering of strut width, and evenly distributed stresses under radial load. Additional inventive features include cross-struts with degradation-driven breakage and configuration for angioplasty.
Viscoelastic transition between collapsed and expanded configurations with hinge/mid cross-section
A bioresorbable vascular implant for implantation in a bodily lumen includes one or more annular support members with a plurality of struts interconnected by a hinge region and each strut including a mid-section, where the implant is comprised of at least one viscoelastic material that enables transition between a collapsed configuration and an expanded configuration and where each strut and the hinge region define a cross-section.
Moment of inertia increases toward hinges to resist radial load in expanded configuration
The moment of inertia increases from each mid-section towards each hinge region to accommodate the transition and resist a radial load applied to the vascular implant in the expanded configuration.
Substantially continuous tapering of strut width from hinge to mid-section
The width of each strut tapers substantially continuously from each hinge region to each mid-section.
Evenly distributed stresses between mid-section and hinge region under radial load
Stresses between the mid-section of each strut and the hinge region are evenly distributed under application of the radial load to the vascular implant in the expanded configuration.
Cross-strut intersecting annular support members with degradation-driven breakage constraint
At least one cross-strut intersects the one or more annular support members, and the at least one cross-strut breaks in less than about 90 days due to degradation of the viscoelastic material comprising the at least one cross-strut following implantation in the bodily lumen.
Angioplasty use configuration
The vascular implant is configured for use in an angioplasty procedure.
Across the independent claims, the inventive coverage centers on a bioresorbable tubular vascular implant with viscoelastic collapsed-to-expanded transition, a hinge/mid-section cross-section where moment of inertia increases toward hinge regions, substantially continuous tapering of strut width from hinges to mid-sections, and evenly distributed stresses under radial load in the expanded configuration. One independent claim additionally requires intersecting cross-struts that break in less than about 90 days due to degradation, and another independent claim requires configuration for angioplasty.
Stated Advantages
More homogeneous stress distribution under radial loading in the expanded configuration by evenly distributed stresses between the mid-section and the hinge region.
Resistance to a radial load in the expanded configuration by increasing moment of inertia from mid-sections toward hinge regions.
Documented Applications
Implantation in a bodily lumen as part of angioplasty procedures.
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