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Effects of Fe addition on the mechanical and corrosive properties of biomedical Co-Cr-W-Ni alloys for balloon-expandable stents.
J Mech Behav Biomed Mater
December 2024
Department of Mechanical Engineering, Kindai University, 3-4-1, Kowakae, Higashiosaka, 577-8502, Japan.
Co-20Cr-15W-10Ni (mass%, CCWN) alloy is extensively used as a platform material for balloon-expandable stents. In this study, the mechanical properties of CCWN alloy are improved following the addition of Fe, and the effects of Fe addition on the mechanical and corrosive properties of the alloy are investigated. As-cast specimens were fabricated by adding pure Fe to a commercially available CCWN alloy (base alloy) such that the resulting alloys contained 4, 6, and 8 mass% Fe.
View Article and Find Full Text PDFquantification of stent-graft behaviour during chimney thoracic endovascular aortic repair.
Vascular
July 2024
Department of Engineering Science, University of Oxford, Oxford, UK.
Article Synopsis
- The study aimed to assess how double chimney thoracic endovascular aortic repair (ch-TEVAR) affects gutter phenomena and endograft deformations in a model that simulates real blood flow conditions.
- Researchers compared two types of chimney grafts (balloon-expandable and self-expandable) using advanced imaging techniques to evaluate their behavior during different phases of the heart cycle.
- Results showed that balloon-expandable grafts had significantly larger gutter volumes and exhibited different deformation patterns than self-expandable grafts, highlighting important design considerations for future devices to mitigate risks like endoleak.
Medium-Term Outcomes of Treatment with a VIABAHN VBX Covered Stent for Aortoiliac Occlusive Lesions in Patients with Peripheral Artery Disease.
Ann Vasc Surg
August 2024
Department of Cardiovascular Surgery, Hiroshima University Hospital, Hiroshima-shi, Hiroshima, Japan.
Background: Endovascular treatment (EVT) for aortoiliac (AI) occlusive lesions is now conducted worldwide, but there are challenges in EVT for complex AI lesions. The VIABAHN VBX (W.L.
View Article and Find Full Text PDFUse and performance of the evolut FX transcatheter aortic valve system.
Cardiovasc Revasc Med
October 2024
Mount Sinai Health System, 1190 5th Ave, New York, NY 10029, United States of America.
Background: The next generation supra-annular, self-expanding Evolut FX transcatheter aortic valve (TAV) system was designed to improve catheter deliverability, provide stable and symmetric valve deployment, and assess commissural alignment during the procedure. The impact of these modifications has not been clinically evaluated.
Methods: Procedural information was collected by survey in 2 Stages: Stage I comprised 23 centers with extensive experience with Evolut TAV systems, and Stage II comprised an additional 46 centers with a broad range of balloon- and self-expanding system experience.
Redo-TAVI with the ACURATE neo2 and Prime XL for balloon-expandable transcatheter heart valve failure.
EuroIntervention
March 2024
Boston Scientific Corporation, Marlborough, MA, USA.
Background: There are limited data regarding treatment for failed balloon-expandable transcatheter heart valves (THVs) in redo-transcatheter aortic valve implantation (TAVI).
Aims: We aimed to assess THV performance, neoskirt height and expansion when performing redo-TAVI with the ACURATE platform inside a SAPIEN 3 (S3) compared to redo-TAVI with an S3 in an S3.
Methods: Redo-TAVI was performed on the bench using each available size of the S3, the ACURATE neo2 (ACn2) and the next-generation ACURATE Prime XL (AC XL) implanted at 2 different depths within 20 mm/23 mm/26 mm/29 mm S3s serving as the "failed" index THV.
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