System and methods for treating a bifurcation with a fully crimped stent
Inventors
Assignees
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Publication Number
US-12263107-B2
Publication Date
2025-04-01
Expiration Date
Abstract
A system for treating a bifurcation includes first and second delivery catheters. The first catheter has a first shaft, a first expandable member adjacent the distal end of the first shaft, an auxiliary expandable member disposed under the first expandable member, and a first radially expandable stent disposed over both the first expandable member and the auxiliary expandable member. The second delivery catheter has a second shaft, and a second expandable member adjacent the distal end of the second shaft. A portion of the second catheter is disposed under a portion of the first stent, and a portion of the second delivery catheter passes through a side hole in the first stent. The first stent is crimped over the first and second catheters such that the first stent remains attached to the first and the second catheters during advancement of the catheters through a blood vessel.
Core Innovation
The invention provides a method for treating a bifurcated vessel using a first delivery catheter and a second delivery catheter. The first delivery catheter includes a first elongate shaft, a first expandable member, an auxiliary expandable member disposed under the first expandable member, and a first stent disposed over both the first expandable member and the auxiliary expandable member. The second delivery catheter includes a second elongate shaft and a second expandable member, where a portion of the second elongate shaft is disposed under the first stent and the second elongate shaft passes through a side hole in the first stent.
Both the first delivery catheter and the second delivery catheter are advanced through a main branch vessel to a bifurcation having a side branch vessel. The auxiliary expandable member is radially expanded to an expanded configuration such that the expanded auxiliary expandable member engages and expands a first portion of the first expandable member. In the expanded configuration, the auxiliary expandable member also radially expands the first stent from a crimped configuration to a partially expanded configuration while a second portion of the first stent remains crimped to the first delivery catheter.
After the partially expanded configuration is achieved, the auxiliary expandable member is radially contracted from the expanded configuration to a collapsed configuration, thereby radially contracting the first expandable member and forming a gap between an inside surface of the first stent and an outer surface of the first elongate shaft and the outer surface of the second elongate shaft. The second elongate shaft is then slidably moved relative to the first elongate shaft after forming the gap, with the second elongate shaft sliding under a portion of the first stent and passing through the side hole in the first stent while the second portion of the first stent remains crimped to the first delivery catheter to prevent movement of the first stent relative to the first delivery catheter.
Claims Coverage
The consolidated claim coverage provides one independent method claim centered on partial stent expansion using an auxiliary expandable member, gap formation while keeping a portion of the first stent crimped to the first delivery catheter, and sliding the second elongate shaft through a side hole in the first stent to prevent undesired movement.
Auxiliary expandable member for partial stent expansion while keeping stent portion crimped
The method advances first and second delivery catheters to a bifurcation and radially expands an auxiliary expandable member to engage and expand a first portion of a first expandable member while also radially expanding a first stent from a crimped configuration to a partially expanded configuration, with a second portion of the first stent remaining crimped to the first delivery catheter.
Gap formation between stent inside surface and shaft outer surfaces
The method radially contracts the auxiliary expandable member to a collapsed configuration, radially contracting the first expandable member and forming a gap between an inside surface of the first stent and an outer surface of the first elongate shaft and an outer surface of the second elongate shaft while the second portion of the first stent remains crimped to the first delivery catheter.
Sliding second elongate shaft through side hole to prevent stent movement
After forming the gap, the method slidably moves the second elongate shaft relative to the first elongate shaft so that the second elongate shaft slides under a portion of the first stent and passes through the side hole in the first stent while the second portion of the first stent remains crimped to the first delivery catheter to prevent movement of the first stent relative to the first delivery catheter.
The independent claim coverage is directed to a coordinated sequence in which an auxiliary expandable member partially expands a first stent while keeping a second portion crimped, a gap is formed by contracting the auxiliary expandable member, and the second elongate shaft is slid through a side hole in the partially expanded first stent while retaining the crimped portion to prevent relative stent movement.
Stated Advantages
Prevents movement of the first stent relative to the first delivery catheter.
Documented Applications
Treating a bifurcated vessel by advancing first and second delivery catheters through a main branch vessel to a bifurcation with a side branch vessel.
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