Occlusive implant and delivery system
Inventors
Assignees
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Publication Number
US-11974755-B2
Publication Date
2024-05-07
Expiration Date
Abstract
An occlusive implant with a backbone support structure can be delivered into a body vessel using a delivery assembly that can engage with at least a portion of the implant. The assembly can utilize an engagement member and an engagement socket or a catheter or sheath to removably couple the engagement member with the implant. When the implant is advanced to a target location in the body vessel, the implant can be released to restrict flow of a fluid through the vessel and/or promote occlusion of the vessel.
Core Innovation
The patent describes an occlusive endovascular implant and delivery system intended for rapid, immediate fluid occlusion in small-diameter body lumens using low-profile catheter delivery. The implant includes an expandable radially expandable scaffold or frame that forms an occlusion by moving from a collapsed configuration to an expanded configuration within a body lumen, and the frame is described as comprising a plurality of loops, including single wire loop configurations and dual-wire loop overlap options.
A key structural element is a backbone support coupled to an end portion of the expandable frame and arranged to reverse path at a return point and extend along a majority of a longitudinal length of an outer perimeter of the expandable frame. The backbone support is described as substantially straight, extending from a coupling point toward a return point near the first end portion, and then reversing path toward the coupling point along the majority of the outer perimeter, with optional non-permeable membrane or cover components supported by the expandable frame to inhibit flow.
The disclosure further includes deployment mechanics including a distal engagement section and one or more elongate engagement members that are selectively actuated or withdrawn to releasably hold scaffold sections via catheter apertures and guide structures. The implant carrier assembly and guide sheath support a two-stage deployment process as the implant transitions from collapsed to expanded configuration, and the implant is described as intended for occluding blood vessel flow, with fabrication materials including nitinol (NiTi).
Claims Coverage
The provided independent claims describe four related implant claim sets. The main inventive features are the expandable loop or helical frame geometry, the substantially straight backbone support arranged to reverse path along a majority of the frame length or perimeter, and in one claim set a membrane cover; one claim set further recites a single-wire expandable support frame with collapsed-to-expanded longitudinal length relationships and tensile resistance against longitudinal expansion.
Expandable frame with reversed-path backbone support
An implant comprising an expandable frame comprising a plurality of loops, a first end portion and a second end portion, and a substantially straight backbone support coupled to an end portion and extending toward a return point where the backbone support reverses path to extend along a majority of a longitudinal length of an outer perimeter of the expandable frame.
Single-wire expandable support frame with longitudinal length relationship and tensile resistance backbone
An implant for placement in a body lumen comprising an expandable support frame made of a single wire that moves from a collapsed configuration to an expanded configuration, with a first longitudinal length in the collapsed configuration and a second longitudinal length in the expanded configuration, the first longitudinal length being greater than the second longitudinal length, and a generally straight backbone support coupled to an end portion to provide tensile resistance against longitudinal expansion of the support frame.
Looped body with reverse-path substantially straight backbone section
An implant frame comprising a body with a plurality of loops between first and second end portions, and a backbone support having a base portion directly connected to the second end portion and a substantially straight section extending along a majority of the implant frame length in a reverse path.
Helical frame with membrane cover and reverse-path straight backbone
An implant comprising a helical frame having first and second end portions, a membrane that covers the frame, and a straight backbone that extends a majority of the length of the frame toward the second end portion and back toward the first end portion for enhancing implant stability.
Across the independent claims, the core claimed concepts are an occlusive expandable frame formed with loops or a helical structure and a substantially straight backbone support arranged to reverse path along a majority of the frame length or perimeter. One claim set also recites a membrane cover, and one claim set specifies a single-wire expandable support frame with collapsed-to-expanded longitudinal length relationships and tensile resistance to facilitate engagement against a wall of a body lumen.
Stated Advantages
Rapid, immediate fluid occlusion in small-diameter body lumens.
Occlusion by restraining flow through the body lumen.
Reduced migration risk / minimal or no migration.
Reliable precise placement.
Low-profile catheter delivery.
Torque resistance to reduce migration risk.
Enhanced implant stability.
Documented Applications
Occlusion of blood vessel flow within body lumens.
Microcoil embolization contexts.
X-ray exposure contexts.
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