Stent delivery systems and associated methods
Inventors
Cragg, Andrew H. • Logan, John • Quintana, Nelson • Dehdashtian, Mahmood • Tsai, George
Assignees
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Publication Number
US-10285833-B2
Publication Date
2019-05-14
Expiration Date
Abstract
Stent delivery systems and associated methods for delivering stents are disclosed herein. In several embodiments, a handle assembly for delivering a stent from a tubular enclosure can include a first lead screw having a first lead thread of a first pitch and first handedness, a second lead screw having a second lead thread of a second pitch and second handedness different from the first handedness, and a housing defining threads of the first and second pitches. The first lead screw can be in mechanical communication with the tubular enclosure, and the second lead screw can be in mechanical communication with the stent. Upon rotation of a portion of the housing, the housing threads can engage the lead screws so as to induce simultaneous translations of the lead screws in opposite directions. The simultaneous translations are configured to deploy the stent from the tubular enclosure.
Core Innovation
The invention provides a stent delivery system for deploying a stent within a vessel. A delivery catheter includes a tubular enclosure at a distal end portion of the catheter, and a braided stent is constrained within the tubular enclosure. The stent is configured to transition between an elongated radially compressed state and a shortened radially expanded state, and deployment is driven by a handle assembly that mechanically couples to the catheter and the stent.
The handle assembly includes a first lead screw and a second lead screw of opposite handedness along a longitudinal axis. The first lead screw is in mechanical communication with the tubular enclosure, while the second lead screw is configured to be placed in mechanical communication with the stent. A housing coupled to the delivery catheter has a bore wall with a first housing thread and a second housing thread, where the first and second housing threads intersect on the bore wall.
Upon rotation of at least a portion of the housing about the longitudinal axis, the first housing thread engages the first lead screw and the second housing thread engages the second lead screw so as to induce at least substantially simultaneous translations of the first and second lead screws in opposite directions along the longitudinal axis to deploy the stent from the tubular enclosure. The described system further includes a stent compressor with an axial compression slider that expands the stent while compensating for foreshortening to maintain marker/edge positions and reduce misalignment risk, together with coupling, delay, locking, and release features.
Claims Coverage
The document portion identifies four independent claims: clm-00001, clm-00035, clm-00016, and clm-00048. Across these claims, the central inventive features are centered on opposite-handed lead screws driven by a rotating housing to induce simultaneous opposite-direction axial translations for deployment from a tubular enclosure, with geometry constraints and optional coupling or delay structures.
Simultaneous opposite-direction lead-screw translations for deploying a braided stent
A stent delivery system comprising a delivery catheter with a tubular enclosure holding a braided stent configured to transition between an elongated radially compressed state and a shortened radially expanded state, and a handle assembly with a first lead screw and a second lead screw of opposite handedness mechanically interacting with the tubular enclosure and the stent, respectively; a housing coupled to the delivery catheter with bore wall threads that engage the lead screws so that rotation induces at least substantially simultaneous translations of the first and second lead screws in opposite directions along the longitudinal axis to deploy the stent from the tubular enclosure.
Opposite-handed lead-screw drive constrained by sector/circle fitting cross-sections
A handle assembly with a first lead screw and a second lead screw having respective lead threads of opposite handedness and a housing defining first and second housing threads of corresponding pitches and handedness, where the entireties of the first and second lead screw cross-sections each fit on or within a respective sector of a circle coincident with a cross-section of the handle assembly; rotation of the housing about a longitudinal axis engages the housing threads with the lead threads to induce simultaneous translations of the first and second lead screws in opposite directions along the longitudinal axis configured to deploy the stent from the tubular enclosure.
Coupler abutment interfacing with a coupler engagement surface for delayed mechanical communication
A stent delivery system wherein the second lead screw has a coupler engagement surface, and the system further comprises a coupler in mechanical communication with the stent with an abutment surface configured to interface with the coupler engagement surface of the second lead screw.
Adjacent opposite-handed lead screws forming an approximately circular cross-section
A handle assembly including a first lead screw in mechanical communication with the tubular enclosure and a second lead screw adjacent the first along a longitudinal axis with opposite handedness and configured for mechanical communication with the stent, and a housing with internal first and second housing threads of the corresponding handedness; the adjacent lengths of the lead screws together defining an approximately circular cross-section at their adjacently situated lengths with each lead screw defining a portion of the outer circumference, wherein rotation of the housing about the longitudinal axis engages the first and second housing threads with the first and second lead threads to induce simultaneous translations of the first and second lead screws in opposite directions along the longitudinal axis.
Overall, the claims coverage centers on an opposite-handed, rotating housing that engages first and second lead screws to produce simultaneous opposing axial translations for deploying a braided stent from a tubular enclosure, with optional refinements relating to coupler engagement surfaces and geometry constraints that fit the lead screw cross-sections within circular or sector requirements.
Stated Advantages
Compensates for foreshortening to maintain marker/edge positions and reduce misalignment risk.
Documented Applications
Deployment of a stent graft in abdominal aortic aneurysm (AAA), including exemplary AAA deployment sequences with D-shaped grafts and related vessels such as the aorta, iliac artery, renal artery, and hypogastric artery.
Forward and reverse deployment sequences are documented for delivering the stent graft from the tubular enclosure.
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