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Publication Number
US-12076258-B2
Publication Date
2024-09-03
Expiration Date
Abstract
Methods for crimping a stent on an expandable member of a delivery catheter, and devices and methods for treating a bifurcation are disclosed. A method for crimping includes positioning a stent having a first portion and a second portion over the expandable member, and non-uniformly crimping the stent to the expandable member. The method can include routing an elongate shaft under the second portion of the stent and through the side hole so as to be routed external to the first portion. The stent second portion can be crimped so that the elongate shaft can be slidably disposed relative to the stent second portion prior to deployment of the stent.
Core Innovation
The invention relates to catheter-and-stent systems and methods for treating a bifurcated blood vessel using a first delivery catheter and a second delivery catheter. Each delivery catheter includes an elongate shaft, an expandable member adjacent a distal end of the shaft, and a stent disposed over the expandable member, and the delivery catheters are advanced together to a treatment region. The second stent is configured for radial expansion into engagement with the walls of the blood vessel at the treatment region.
A key feature is non-uniform crimping coordination using different crimp states for the first and second stents. The second stent is partially crimped to the second expandable member to prevent movement of the second stent relative to the second expandable member during advancement while permitting movement of the first expandable member relative to the second expandable member, and the first stent is fully crimped to the first expandable member to prevent movement of the first stent relative to the first expandable member during advancement.
Alignment at the bifurcation is achieved using a side hole in the second stent and relative proximal retraction of the first catheter. The second stent includes a sidewall with a side hole extending therethrough, and the method includes proximally retracting the first catheter through the side hole and out a proximal end of the second stent so that a proximal end of the first expandable member is aligned with the side hole in the second stent. In the system, radial expansion of the second stent places the proximal end of the first stent into alignment with the side hole.
Claims Coverage
The provided set includes three independent claims. Across these claims, the inventive coverage centers on non-uniform crimping of a second stent relative to its expandable member in a bifurcation treatment system, while fully crimping a first stent and using a side hole for proximal retraction and alignment.
Non-uniform crimping to coordinate bifurcation advancement and relative movement
The second stent is partially crimped to the second expandable member to prevent movement of the second stent relative to the second expandable member during advancement while permitting movement of the first expandable member relative to the second expandable member during advancement.
Radial expansion and side-hole proximal retraction alignment
Radially expanding the second stent into engagement with the treatment region and proximally retracting the first catheter through a side hole in the second stent and out a proximal end of the second stent so that a proximal end of the first expandable member is aligned with the side hole in the second stent.
Bifurcation treatment system with fully and partially crimped stents
The first stent is fully crimped to the first expandable member to prevent movement of the first stent relative to the first expandable member during advancement, and the second stent is partially crimped to the second expandable member to prevent movement of the second stent relative to the second expandable member during advancement while permitting movement of the first stent relative to the second expandable member during advancement; and radial expansion of the second stent places the second stent into engagement with the walls of a blood vessel at the treatment region so that a proximal end of the first stent is aligned with the side hole in the second stent.
Assembly with full distal crimping and partial proximal crimping for side-hole alignment
Fully crimping a distal portion of the second stent to the second expandable member to prevent movement of the second stent relative to the second expandable member when the second delivery catheter is advanced through a blood vessel; and partially crimping a proximal portion of the second stent to the first expandable member and the second expandable member, the partial crimping configured to allow movement of the first delivery catheter relative to the second delivery catheter thereby permitting proximal retraction of the first catheter through a side hole in the second stent and out a proximal end of the second stent to align a proximal end of the first stent with the side hole in the second stent.
Overall, the independent claims cover bifurcation treatment methods and systems using two delivery catheters and expandable members, where the second stent is partially crimped to allow coordinated relative movement during advancement. Radial expansion of the second stent into engagement is paired with proximal retraction through a side hole to align the first expandable member or stent with the side hole, while the first stent is fully crimped to its expandable member to prevent relative movement.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Treating a bifurcated blood vessel, including radial expansion into engagement with the walls at a treatment region and aligning a proximal end of the first stent with a side hole in the second stent.
Assembling a system for treating a bifurcated vessel by coupling first and second delivery catheters and applying specified crimping configurations.
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