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Publication Number
US-11565079-B2
Publication Date
2023-01-31
Expiration Date
Abstract
A delivery device can be provided with a low outer profile and high flexibility for navigating tortuous anatomy. An inner lumen defined by a shaft of the delivery device provides adequate space for delivery devices to target anatomy. Additionally, the delivery device maintains the patency of its lumen even when positioned within tortuous anatomy. The turns of filar(s) forming a coil of the shaft adjust their axial spacing relative to each other to avoiding buckling that would otherwise result in a narrowing of the inner lumen.
Core Innovation
The invention relates to a support catheter delivery device for intravascular use. The device includes a proximal end, a distal tip, and a shaft defining a lumen, with a helically wound multi-filar coil in which each filar includes a metal core and a polymer outer layer coating the metal core. The coil construction provides flexibility for tortuous anatomy while maintaining lumen patency.
To reduce sliding friction, the invention applies a lubricious coating to individual filars or wires of the helical coil rather than relying on a conventional inner liner. The shaft further includes a jacket that extends about the coil and is positioned to allow the jacket and the coil to slide relative to each other. In particular, the jacket extends partially radially inwardly between adjacent windings, enabling relative movement between adjacent coated wires to mitigate binding.
The invention also addresses buckling avoidance by enabling adjacent turns to move toward or away from each other through jacket flexibility and partial radial inward extension. This axial spacing adjustment avoids buckling that would narrow the inner lumen. A distal tip is provided that is atraumatic and tapered, with optional radiopaque markers, and the shaft construction can include additional support or intermediate layers configured as a coil or a braid.
Claims Coverage
The consolidated document provides three independent claims covering a delivery device having a proximal end, a distal tip, and a shaft that defines a lumen using a helically extending coil and a jacket that allows relative movement. Across the independent claims, inventive features are directed to coil filar construction with a metal core and a polymer outer layer, jacket engagement and partial radial inward extension between windings, and layered jackets or support layers.
Helical filar coil with metal core and polymer outer layer
A shaft having a coil comprising a filar extending helically about an axis to define the lumen, where the filar comprises a metal core and a polymer outer layer coating the metal core.
Partially radially inward jacket between adjacent windings to allow sliding
A jacket extending about the coil, wherein the jacket extends partially radially inwardly between adjacent windings of the coil and is positioned over the coil to allow the jacket and the coil to slide relative to each other.
PTFE defining surface with thermoplastic jacket wrapped to allow relative movement
A coil comprising a core and polytetrafluoroethylene defining a surface of the coil, where the polytetrafluoroethylene defines a radially innermost portion extending along an entirety of the shaft; and a jacket comprising a thermoplastic extending about and engaging the coil, wherein the jacket is wrapped onto the coil to allow the jacket and the coil to move relative to each other.
First jacket and support layer with coil or braid, covered by second jacket
A first jacket engaging the coil along a length of the coil; a support layer engaging the first jacket along a length of the first jacket, where the support layer forms a coil or a braid; and a second jacket engaging the support layer along a length of the support layer.
Overall claim coverage centers on delivery devices with a lumen-defining helically extending coil having metal-core filars and polymer outer layers, together with a jacket system that engages the coil such that the jacket and coil can move or slide relative to each other. The broader form uses partial radial inward extension between adjacent windings, while other forms specify wrapped thermoplastic jacket engagement and layered jacket or support arrangements.
Stated Advantages
Provides a low outer profile and high flexibility for tortuous anatomy.
Maintains lumen patency.
Reduces sliding friction by applying a lubricious coating to individual filars or wires of the helical coil.
Mitigates binding through relative movement between coated wires.
Avoids buckling that would narrow the inner lumen by adjusting axial spacing through jacket flexibility and partial radial inward extension.
Documented Applications
Crossing or cutting devices through occlusions, including CTO.
Expandable devices at occlusions, including expandable stent or drug-delivery device contexts.
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