Mechanical detachment system for transcatheter devices
Inventors
Le, Le • Leo, Rose Y. • Yeh, Chung • Kwong, Kasey • Marlangaue, Rochelle • Landsman, Todd L. • Barrett, Michael
Assignees
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Publication Number
US-11701123-B2
Publication Date
2023-07-18
Expiration Date
Abstract
Embodiments include, for example, mechanical release systems for implantable medical devices.
Core Innovation
The invention relates to a transcatheter mechanical detachment or release system for an implant, including embodiments with a shape memory polymer (SMP). The system uses an implant that includes a shape memory polymer (SMP) non-releasably coupled to a collar, and includes a distal actuator wire, a retention wire, and a proximal actuator wire that are coupled through a shaft.
The collar includes a channel, a first aperture, and a second aperture located in a sidewall of the collar. The distal actuator wire is included within the channel and traverses the first aperture but not the second aperture, while the retention wire is included within the channel and traverses the first and second apertures. The release architecture is state-dependent, including deployment and non-deployed configuration behavior, where direct contact and force transfer between wire portions and apertures are defined based on the configuration.
The document further describes structural and material features intended to support controlled release and repeated manipulation prior to final detachment. Examples include radiopaque conduits or collars, material options including platinum/iridium or tungsten, chamfered portions of conduit edges to manage implant thrust/rotation and prevent premature release, resistance-fit or interference-fit concepts, and sliding cuffs and aperture geometry to mitigate wire foreshortening variability encountered in conventional single-pull systems.
Claims Coverage
Two independent claims are present, each covering an implant-and-wire system with two apertures and two releasable conduits arranged so that one wire traverses only the first aperture while another wire traverses both the first and second apertures. Across the independent claims, the key inventive features are the wire-in-aperture routing, the coil inclusion or exclusion relative to particular wires, and releasable conduit coupling to the collar or implant.
SMP implant with collar channel and first and second apertures
An implant including a shape memory polymer (SMP) non-releasably coupled to a collar, where the collar includes a channel, a first aperture, and a second aperture located in a sidewall of the collar.
Dual-wire routing through first and second apertures
A distal actuator wire included within the channel and traverses the first aperture but not the second aperture, and a retention wire included within the channel and traverses the first and second apertures.
Coil included for one actuator wire but not the retention wire
A coil that includes the distal actuator wire but not the retention wire.
Two releasably coupled conduits with coil present in one path
A first conduit releasably coupled to the collar and including the distal actuator wire and the retention wire but not the coil, and a second conduit releasably coupled to the collar and including the distal actuator wire, the retention wire, and the coil.
Medical implant with channel and first and second apertures
A medical implant including a channel, a first aperture, and a second aperture located in a sidewall of the medical implant.
Dual-wire routing through implant apertures
A first wire included within the channel and traverses the first aperture but not the second aperture, and a second wire included within the channel and traverses the first and second apertures.
Coil included for the first wire but not the second wire
A coil that includes the first wire but not the second wire.
Two releasably coupled conduits with coil present in one path
A first conduit releasably coupled to the medical implant and including the first wire and the second wire but not the coil, and a second conduit releasably coupled to the medical implant and including the first wire, the second wire, and the coil.
The independent claims cover a shared core architecture in which the implant or collar defines a channel with first and second apertures, the coil is associated with only one of the wires, and two releasable conduits provide different inclusion or exclusion of the coil so that distinct wires traverse different subsets of the apertures.
Stated Advantages
Controlled release and repeated manipulation prior to final detachment.
Manage implant thrust and rotation and prevent premature release.
Mitigate wire foreshortening variability encountered in conventional single-pull systems.
Documented Applications
No documented applications found
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