Transcatheter Mitral Valve Replacement: A Novel Anchor Technology.
Journal
The Thoracic and cardiovascular surgeon
ISSN: 1439-1902
Titre abrégé: Thorac Cardiovasc Surg
Pays: Germany
ID NLM: 7903387
Informations de publication
Date de publication:
Mar 2022
Mar 2022
Historique:
pubmed:
5
2
2021
medline:
22
3
2022
entrez:
4
2
2021
Statut:
ppublish
Résumé
Mitral valved stents tend to migrate or to develop paravalvular leakage due to high-left ventricular pressure in this cavity. Thus, this study describes a newly developed mitral valved stent anchoring technology. Based on an existing mitral valved stent, four anchoring units with curved surgical needles were designed and fabricated using three-dimensional (3D) software and print technology. Mitral nitinol stents assembled with four anchoring units were successively fixed on 10 porcine annuli. Mechanical tests were performed with a tensile force test system and recorded the tension forces of the 10 nitinol stents on the annulus. The average maximum force was 28.3 ± 5.21 N, the lowest was 21.7 N, and the highest was 38.6 N until the stent lost contact with the annulus; for the break force (zero movement of stent from annulus), the average value was 18.5 ± 6.7 N with a maximum value of 26.9 N and a minimum value of 6.07 N. It was additionally observed that the puncture needles of the anchoring units passed into the mitral annulus in all 10 hearts and further penetrated the myocardium in only one additional heart. The anchoring units enhanced the tightness of the mitral valved stent and did not destroy the circumflex coronary artery, coronary sinus, right atrium, aortic root, or the left ventricular outflow tract. The new anchoring units for mitral nitinol stents were produced with 3D software and printing technology; with this new type of anchoring technology, the mitral valved stent can be tightly fixed toward the mitral annulus.
Sections du résumé
BACKGROUND
BACKGROUND
Mitral valved stents tend to migrate or to develop paravalvular leakage due to high-left ventricular pressure in this cavity. Thus, this study describes a newly developed mitral valved stent anchoring technology.
METHODS
METHODS
Based on an existing mitral valved stent, four anchoring units with curved surgical needles were designed and fabricated using three-dimensional (3D) software and print technology. Mitral nitinol stents assembled with four anchoring units were successively fixed on 10 porcine annuli. Mechanical tests were performed with a tensile force test system and recorded the tension forces of the 10 nitinol stents on the annulus.
RESULTS
RESULTS
The average maximum force was 28.3 ± 5.21 N, the lowest was 21.7 N, and the highest was 38.6 N until the stent lost contact with the annulus; for the break force (zero movement of stent from annulus), the average value was 18.5 ± 6.7 N with a maximum value of 26.9 N and a minimum value of 6.07 N. It was additionally observed that the puncture needles of the anchoring units passed into the mitral annulus in all 10 hearts and further penetrated the myocardium in only one additional heart. The anchoring units enhanced the tightness of the mitral valved stent and did not destroy the circumflex coronary artery, coronary sinus, right atrium, aortic root, or the left ventricular outflow tract.
CONCLUSION
CONCLUSIONS
The new anchoring units for mitral nitinol stents were produced with 3D software and printing technology; with this new type of anchoring technology, the mitral valved stent can be tightly fixed toward the mitral annulus.
Identifiants
pubmed: 33540424
doi: 10.1055/s-0041-1722976
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
126-132Informations de copyright
Thieme. All rights reserved.
Déclaration de conflit d'intérêts
None of the authors has a potential conflict of interest concerning the published data that might influence the independence of the study at the time. The study did not receive any financial or other aid from a commercial source. All authors confirm that they had full control of the design and methods of the study, the data analysis, and production of the written report.