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Publication Number
US-11382735-B2
Publication Date
2022-07-12
Expiration Date
Abstract
The present invention eliminates the need for highly accurate alignment with a branched tubular tissue when implanting a stent graft. A stent graft 30 comprises: a framework section 31; and a tubular graft section 40. A side surface opening 42 that passes through to the lumen of the graft section is provided in one section of a tube wall 41 of the graft section. In the framework section, among the six frame bodies, the frame bodies 34, 35 that are provided facing the side surface opening section have a first frame body structure section Q that is present in the tube wall along the entire circumference, and a second frame body structure section P that is present in the tube wall in a partial region 41A, which excludes the side surface opening section in the circumferential direction of the tube wall.
Core Innovation
The invention relates to a stent graft comprising a framework section including a plurality of frame bodies and a tubular graft section fixed to the framework section, where a radially recessed concave section is provided in a part of the tube wall. In the concave section, a side surface opening passes through to a lumen of the tubular graft section, and the tube wall is divided into a first tube wall section in which the concave section is not provided and a second tube wall section in which the concave section is provided.
The first frame body is arranged correspondingly to the side surface opening and includes a first frame body structure section disposed in the first tube wall section and a second frame body structure section disposed in a part of the second tube wall section not including the side surface opening. The first frame body is formed by a single wire folded in a zigzag shape that intersects a virtual plane orthogonal to the tube axis and passing through the concave section, and the single wire has a long section and a short section with a greater spacing between folded sections in the long section than in the short section.
A related aspect includes a tubular stent body with first and second axially disposed portions, where the second portion includes a radially recessed section and the circumferences are identical except at the recessed section. A reinforcing element fixed to both portions extends from the first portion to the second portion and is formed by a single zigzag-folded wire intersecting a virtual plane orthogonal to the longitudinal axis and passing through the recessed section, with a long section and a short section having different folded-section spacing.
Claims Coverage
The document includes three independent claims directed to a stent graft or tubular stent body with a recessed section and a single zigzag-folded wire structure. The inventive features center on the concave or radially recessed section, the lumen-passing side surface opening or recessed section, and the long/short wire sections with different folded-section spacing across the tube-wall or stent-body portions.
Concave recessed tube wall with lumen-passing side opening limited to a second tube wall section
A tubular graft section fixed to a framework section, where a concave section recessed in a radial direction is provided in a part of a tube wall, a side surface opening passes through to a lumen in the concave section, and the tube wall is divided into a first tube wall section without the concave section and a second tube wall section with the concave section.
First frame body corresponding to the side opening with long/short zigzag-wire fold spacing
A first frame body arranged correspondingly to the side surface opening, where the first frame body includes a first frame body structure section disposed in the first tube wall section and a second frame body structure section disposed in a part of the second tube wall section not including the side surface opening; the first frame body is formed by a single wire folded in a zigzag shape intersecting a virtual plane orthogonal to the tube axis passing through the concave section, with the long section having greater folded-section spacing than the short section.
First and second structural bodies connected with wire-fold spacing relationships and axial extent
A tubular graft section fixed to a framework section including first and second structural bodies, where the first tube wall section is fixed to the first structural body and the second tube wall section is fixed to the second structural body, and the first structural body is connected to the second structural body; the first structural body has a first section and a second section with greater folded-section spacing in the first section, and the second structural body has a third section with folded-section spacing equal to that of the first section.
Single-wire reinforcing element with unchanged circumferences except at the recessed section
A tubular stent body with first and second axially disposed portions, where the second portion includes a section recessed in a radial direction such that the first and second circumferences are identical except at the recessed section; a reinforcing element fixed to the first and second portions extends from the first portion to the second portion and is formed by a single zigzag-folded wire intersecting a virtual plane orthogonal to the longitudinal axis and passing through the radially recessed section.
Across the independent claims, the core protection is directed to a radially recessed concave section or recessed section with a lumen-passing side surface opening, together with a corresponding frame or reinforcing wire structure formed by a single zigzag-folded wire that intersects an orthogonal virtual plane through the recessed section and includes long and short sections with different folded-section spacing.
Stated Advantages
Increases tolerance for positional/orientation mismatch between a branch-vessel opening and a stent side opening.
Maintains flexibility near the side opening.
Improves graft strength using adjacent full-circumference structure sections.
Suppresses side-opening displacement from blood flow.
Supports branch-graft connection inside a space created by the concave recess.
Documented Applications
Branch-tissue procedures requiring connection of a branch vessel through a stent side opening, including aortic use as described (thoracic aorta and abdominal aorta) and applicability beyond aortic use.
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