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Publication Number
US-11857442-B2
Publication Date
2024-01-02
Expiration Date
Abstract
A system for treating a bifurcation includes first and second delivery catheters, each having an expandable member and a stent. The stent on the second delivery catheter has a side hole. A portion of the first delivery catheter is disposed under a portion of the stent on second delivery catheter. The first delivery catheter is slidable relative to the second delivery catheter, and the first delivery catheter passes through the side hole.
Core Innovation
The disclosure relates to a method of treating a bifurcated vessel in which first and second delivery catheters carry respective stents over expandable members. The first stent is disposed into a side branch and the second stent is disposed into a main branch of a bifurcation having a bifurcation angle of less than 70 degrees. Each stent is in a collapsed configuration and an expanded configuration.
The method proximally retracts the first elongate shaft under a proximal portion of the second stent in the collapsed configuration until a proximal end of the first stent is aligned with a side hole in the second stent. This alignment coordinates the relative positioning of the stents before coordinated expansion begins.
The first expandable member is radially expanded to simultaneously expand the first stent into engagement with a vessel wall in the side branch and expand a proximal portion of the second stent into engagement with a vessel wall in the main branch from the collapsed configuration. After this simultaneous expansion, the second expandable member is radially expanded to further expand the proximal portion of the second stent and to expand a distal portion of the second stent into engagement with the vessel wall of the main branch.
Claims Coverage
One independent method claim is described, with four inventive features centered on coordinated two-catheter deployment, positional alignment, and staged expansion in a bifurcated blood vessel having a bifurcation angle of less than 70 degrees.
Two-catheter bifurcated vessel stent deployment
Providing a first delivery catheter and a second delivery catheter, each having an elongate shaft, an expandable member, and a stent crimped on the expandable member in a collapsed configuration and expanded to engage and support a vessel wall in an expanded configuration; advancing the first and second delivery catheters toward a bifurcation in a blood vessel where the bifurcation comprises a main branch vessel and a side branch vessel; disposing the first stent into the side branch and disposing the second stent into the main branch.
Proximal retraction aligning the first stent with a side hole in the second stent
Proximally retracting the first elongate shaft under a proximal portion of the second stent in the collapsed configuration until a proximal end of the first stent is aligned with a side hole in the second stent.
Simultaneous expansion of the first stent and the proximal portion of the second stent
Radially expanding the first expandable member, thereby simultaneously expanding the first stent into engagement with a vessel wall in the side branch and expanding the proximal portion of the second stent into engagement with a vessel wall in the main branch from the collapsed configuration.
Further expansion of the second stent in the main branch
Radially expanding the second expandable member, thereby further expanding the proximal portion of the second stent and expanding a distal portion of the second stent into engagement with the vessel wall of the main branch.
The claims center on coordinated dual-catheter deployment in a bifurcated vessel, alignment of the first stent with a side hole in the second stent via proximal retraction, and staged radial expansion that first deploys the side-branch stent and proximal main-branch portion and then further expands the second stent in the main branch.
Stated Advantages
Reduces daughter-vessel jailing by coordinating proximal stent alignment with the side-hole/ostium.
Documented Applications
Treating a bifurcated vessel in a blood vessel using a bifurcation stenting system with first and second delivery catheters and radially expandable stents.
Stenting in bifurcations where the bifurcation angle between a main branch vessel and a side branch vessel is less than 70 degrees.
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