Membrane body for tubular treatment device and tubular treatment device
Inventors
Assignees
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Publication Number
US-12343250-B2
Publication Date
2025-07-01
Expiration Date
Abstract
A membrane body for a tubular treatment device includes a tubular membrane portion (12). The membrane portion forms a multi-layer structure having a first layer (21) formed of a fiber and a second layer (22) having liquid permeability lower than that of the first layer.
Core Innovation
The invention relates to a stent graft having a tubular membrane portion and a self-expandable skeleton portion formed by a metal wire wound around an axial center of the stent graft. The skeleton portion is sutured to one surface of the membrane portion with thread, and the membrane portion forms a multi-layer structure including a first layer made of a woven polyester resin fiber and a second layer having liquid permeability lower than that of the first layer and made of a membrane body formed of polytetrafluoroethylene (PTFE).
The membrane portion further includes an intermediate adhesive layer adhering the first layer and the second layer, where the adhesive layer comprises silicone. The first layer has a fiber gap formed by mutually orthogonal fibers of the woven, and the fiber gap is filled with the silicone. When suturing is performed, the thread for suturing the skeleton portion passes through the fiber gap in the first layer and penetrates the second layer, thereby forming an opening in the second layer.
The multi-layer arrangement is configured so that the first layer and its silicone-filled fiber gaps cooperate to resist enlargement of the opening produced in the second layer during suturing. Layer orientation is described such that the first layer faces the skeleton and the second layer faces blood, to reduce wear of the low-permeability layer and to improve antithrombotic contact and reduce leakage into a lesion site. The arrangement enables reduced overall membrane thickness for improved sheath delivery and reduced invasiveness.
Claims Coverage
The document includes one independent claim, covering a stent graft with a multi-layer membrane bonded by silicone adhesive and sutured to a self-expandable metal-wire skeleton such that suturing creates and maintains resistance to widening of an opening in a low-liquid-permeability PTFE layer. Inventive features are expressed in terms of the membrane layer materials, silicone filling of woven fiber gaps, and the suturing thread path through the silicone-filled gap into the PTFE layer to resist opening widening.
Multi-layer tubular membrane for stent graft
A stent graft comprising a tubular membrane portion that forms a multi-layer structure having a first layer made of a woven polyester resin fiber and a second layer having liquid permeability lower than that of the first layer and made of a membrane body formed of polytetrafluoroethylene (PTFE).
Silicone intermediate adhesive layer adhering membrane layers
An intermediate adhesive layer adhering the first layer and the second layer, wherein the adhesive layer comprises silicone.
Silicone-filled fiber gaps in the woven first layer
The first layer has a fiber gap formed by mutually orthogonal fibers of the woven, the fiber gap is filled with silicone.
Thread path through silicone-filled gap into PTFE layer
The thread for suturing the skeleton portion to the membrane portion passes through the fiber gap in the first layer of the membrane portion and penetrates the second layer.
Resistance to widening of PTFE opening caused by suturing
The membrane portion provides resistance to a force for widening an opening of the second layer caused by suturing, using the fibers of the woven in which the fiber gap is filled with the silicone.
Across the independent claim, the coverage centers on a tubular multi-layer membrane (woven polyester first layer, silicone intermediate adhesive, and PTFE second layer with lower liquid permeability) where silicone-filled woven fiber gaps receive the suturing thread and penetration into the PTFE layer is used to form an opening that resists widening caused by suturing.
Stated Advantages
Provides resistance to a force for widening an opening of the second layer caused by suturing.
Improves antithrombotic contact.
Reduces leakage into a lesion site.
Enables reduced overall membrane thickness for improved sheath delivery.
Reduces invasiveness.
Documented Applications
Use in a lesion site, including an aortic aneurysm/dissection, as referenced in the described context of leakage reduction and antithrombotic contact.
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