Abstract
Transcatheter heart valve implantation is an emerging technology and an alternative to surgical valve replacement. Most existing systems consist of valves sewn into balloon-expandable stents with a delivery catheter functioning with the specific valve only. The aim of this study was to develop a universally applicable delivery system (DS) for plane stents, valves sewn into both balloon-expandable and self-expandable stents and feasible for use with different access routes. A DS was designed and manufactured in five different diameters. The requirements were derived from the implants, the implantation technique and the cardiovascular geometry of the experimental sheep. The combination of a self-expandable Nitinol stent and a jugular access point represented the major challenge as both flexibility and rigidity of the DS were required. To fulfill these contradicting mechanical properties the sheaths were comprised of a soft outer polymer tube with a stainless steel coiled spring inside. Tissue-engineered and pericardial pulmonary valves were implanted. Also polymeric and balloon-expandable stents were delivered to various positions in the vascular system. The initial success rate was 70.5%. After refinement of the DS, a success rate of 83.3% was achieved with the remaining failed implantations resulting from inadequate sizes of the prostheses.
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Abbreviations
- CT:
-
Computed tomography
- DS:
-
Delivery system
- IC:
-
Inner catheter
- ID:
-
Inner diameter
- OC:
-
Outer catheter
- OD:
-
Outer diameter
- PA:
-
Pulmonary artery
- PV:
-
Pulmonary valve
- TAVI:
-
Transcatheter aortic valve implantation
- TEHV:
-
Tissue engineered pulmonary heart valve
- TPVI:
-
Transcatheter pulmonary valve implantation
- HDPE:
-
High-density polyethylene
- PU:
-
Polyurethane
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Acknowledgements
The authors would like to thank our veterinarians Kerstin Brakmann, Fabienne Ferrara and Angela Körner; Antonia Prudlo for her work in our group and Anne Gale for editorial assistance; the Lifevalve group for the good collaboration, discussions and suggestions, especially Frank Thiel, Christian Baumeister and Thilo Wack from pfm medical AG for discussions about catheters; Marco Mueller, Lutz Rautenberg and Christian Wyrwich from the Institute of Polymertechnik und Polymerphysik, TU Berlin for help with the buckling tests; Linda Maher, Cassie Strauss, Eamonn Stenson, Barry Mulligan and Jonnie Goodwin from VistaMed Ltd and Ger Mullane and Eamonn Barrett from SHANNON COILED SPRINGS LIMITED for the good cooperation. The work was funded by the European Union’s Seventh Framework Programme (FP7/2007‐2013) under Grant Agreement Number 242008 (LifeValve).
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Associate Editor Joel D. Stitzel oversaw the review of this article.
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Bartosch, M., Peters, H., Spriestersbach, H. et al. A Universal Delivery System for Percutaneous Heart Valve Implantation. Ann Biomed Eng 44, 2683–2694 (2016). https://doi.org/10.1007/s10439-016-1561-2
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DOI: https://doi.org/10.1007/s10439-016-1561-2