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Publication Number
US-10779968-B2
Publication Date
2020-09-22
Expiration Date
Abstract
An endoluminal device can be configured for precise positioning during deployment within a vessel. The endoluminal device can be a tack, stent, vascular implant or other type of implant. The endoluminal device can have circumferential member with an undulating configuration having multiple inward and outward apexes and struts extending therebetween. Two of the struts can be used to establish a foot for the precise positioning of the device during deployment. A method of placing the endoluminal device can include withdrawing an outer sheath such that a portion of the endoluminal device is expanded prior to the rest of the endoluminal device.
Core Innovation
The invention describes an intravascular implant configured to be compressed for delivery and to self-expand when deployed. The implant includes a self-expanding tubular body having a proximal end, a distal end, and a lumen extending therethrough along a central axis, where the body comprises a plurality of metal struts. The body is characterized by compression and expansion behaviors expressed using force curves measured over a range of outer diameters of at least 2 mm.
The core design defines a compression force curve as a measure of radial force required to compress the body along the range of outer diameters, and defines an expansion force curve as a measure of radial force exerted by the body when the body radially self-expands along the range of outer diameters. The relationship between the compression and expansion behaviors is constrained by explicit limits expressed in Newtons, including limits on the difference between the compression and expansion radial forces, the change in radial force along the expansion force curve, or the magnitude of radial force along the expansion force curve.
The invention further characterizes implant structure that supports controlled deployment and positioning. In the disclosed design, bridge members and an anchor are associated with a foot that can partially expand while proximal portions remain constrained, and the structure maintains particular containment behaviors in a circular shape or cylindrical configuration while protruding or extending outward when the body is forced out of that configuration.
Claims Coverage
The document includes three independent claims, each directed to an intravascular implant configured for compression delivery and self-expansion, with force-curve constraints over an outer-diameter range and additional structural containment/protrusion features.
Compression and expansion force-curve consistency by limited radial-force difference across an outer-diameter range
An intravascular implant having a self-expanding tubular body with metal struts, where the body has a compression force curve and an expansion force curve measured along a range of outer diameters of at least 2 mm, and where the difference between the radial force of the compression force curve and the radial force of the expansion force curve is no more than 4 N at each diameter through the range of outer diameters.
Expansion force-curve stability by limited radial-force change across an outer-diameter range
An intravascular implant having a self-expanding tubular body with metal struts, where the body has a compression force curve and an expansion force curve measured along a range of outer diameters of at least 2 mm, and where the change in radial force along the expansion force curve is no more than 3 N along the range of outer diameters.
Limited expansion radial force across an outer-diameter range
An intravascular implant having a self-expanding tubular body with metal struts, where the body has a compression force curve and an expansion force curve measured along a range of outer diameters of at least 2 mm, and where the radial force along the expansion force curve is no more than 5 N along the range of outer diameters.
Across the independent claims, the inventive coverage centers on self-expanding intravascular tubular implants whose radial-force behavior is constrained using compression and expansion force curves over an outer-diameter range of at least 2 mm, with explicit Newton-based limits on the difference between compression and expansion radial forces, the change in radial force along the expansion force curve, or the magnitude of radial force along the expansion force curve.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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