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Publication Number
US-12605173-B2
Publication Date
2026-04-21
Expiration Date
Abstract
Retrieval assemblies configured to capture an obstruction located in a bodily duct of a patient and associated methods are provided. According to one implementation a retrieval assembly is provided that includes a proximal collar, a distal collar and a plurality of elongate clot capturing elements that each has proximal and distal ends that are respectively coupled to the proximal and distal collars. The retrieval device is mounted on an elongate wire with at least one of the proximal collar and distal collar being slideable along a portion of the length of the elongate wire to enable the retrieval device to transition from an unexpanded state to an expanded state. At least a portion of one or both of proximal and distal end sections of the elongate clot capturing elements being arranged curved about a longitudinal axis of the retrieval device when the retrieval device is in the unexpanded state.
Core Innovation
The invention relates to an assembly for retrieving a clot from a bodily duct of a patient. The assembly uses an elongate wire carrying a retrieval device that transitions from a radially unexpanded state to a radially expanded state to deliver distal to the clot location and then retrieve the clot. The retrieval device includes a distal collar with an opening for a wire portion and a proximal collar located proximal to the distal collar with an opening for another wire portion.
During transition, at least one of the proximal collar and distal collar is slideable on a surface of the elongate wire, such that the separation between the collars decreases in the radially expanded state. The clot-capturing structure includes a plurality of elongate clot capturing elements circumferentially separated by elongate slots extending continuously between the proximal and distal collars. In the radially expanded state, a portion of some of the clot capturing elements extends proximal to the proximal collar.
A key structural configuration involves proximal inversion and zigzag arched configurations, in which proximal portions of the elongate clot capturing elements are disposed proximal to the proximal collar in expanded states to enhance radial force and stiffness for clot engagement. The disclosure further describes that at least a portion of one or both of the proximal and distal end sections of the clot capturing elements is arranged curved about the longitudinal axis when the retrieval device is in the radially unexpanded state, and that collar structures include radiopaque material.
The document also characterizes alternative construction approaches including single-piece formation versus assembled constructions. It additionally describes multiple retrieval device assemblies and axial adjustability of spacing via a mechanism that uses an elongate hypotube and a sliding tab to enable axially movable proximal retrieval device positioning.
Claims Coverage
The independent claim is clm-00001. It defines one inventive feature set for a clot-retrieval assembly with a wire-mounted retrieval device having paired slideable collars with decreasing collar separation upon transition, and a plurality of circumferentially separated elongate clot capturing elements coupled to the collars through continuous elongate slots, with curved end sections that cause proximal extension beyond the proximal collar in the expanded state.
Clot retrieval assembly with radially transitioning wire-mounted retrieval device
An assembly for retrieving a clot from a bodily duct including an elongate wire and a retrieval device mounted on the elongate wire, where the retrieval device transitions from a radially unexpanded state to a radially expanded state for delivery distal to the clot and retrieval of the clot.
Slideable proximal and distal collars with decreasing separation upon expansion
A distal collar with a first opening and a proximal collar with a second opening, where in the radially unexpanded state the proximal and distal collars are separated by a first distance and in the radially expanded state the proximal and distal collars are separated by a second distance less than the first distance, and wherein at least one of the proximal collar and distal collar is slideable on a surface of the elongate wire along a portion of the length of the elongate wire to enable the transition.
Continuous elongate slots separating circumferentially separated elongate clot capturing elements
A plurality of elongate clot capturing elements where each pair of neighboring elongate clot capturing elements is circumferentially separated by an elongate slot extending continuously between the proximal and distal collars, and where each clot capturing element has a proximal end coupled to the proximal collar and a distal end coupled to the distal collar.
Curved unexpanded end sections enabling proximal extension in expanded state
At least a portion of one or both of the proximal and distal end sections of the elongate clot capturing elements arranged curved about the longitudinal axis when the retrieval device is in the radially unexpanded state, such that in the radially expanded state a portion of some of the plurality of elongate clot capturing elements extend proximal to the proximal collar.
Claim clm-00001 covers the combination of a wire-mounted radially transitioning retrieval device with a decreasing separation between proximal and distal slideable collars, continuous-slot circumferentially separated clot capturing elements, and curved end-section geometry that yields proximal extension beyond the proximal collar in the radially expanded state.
Stated Advantages
Enhancing radial force and stiffness for clot engagement in the radially expanded state.
Documented Applications
Retrieving a clot from a bodily duct of a patient.
Use of the assembly to deliver the retrieval device distal to a clot location and then retrieve the clot in the bodily duct.
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