Abstract
Methods:We assessed at bench side a total of 1200 SEM images obtained in 30 DES samples (15 expanded and 15 unexpanded) of Cypher Select, Taxus Liberté, Endeavor, Xience V, and Resolute.
Results: For most types of coating irregularities seen on expanded DES (72%; 23/32), a matching irregularity (n=18/24) and/or its precursor (n=11/24) was observed in unexpanded corresponding DES. Only a few individual coating irregularities (13%; 4/32) could not be accessed in unexpanded samples, as these irregularities were located on the (invisible) luminal side. Unexpanded Cypher Select showed (small) crater lesions and cracks together with precursors of ‘peeling of polymer’. On unexpanded Taxus Liberté, thinning of polymer, small bare metal areas, wrinkles and one type of precursor was found. Unexpanded phosphorylcholine-based Endeavor stents showed cracks, small bare metal areas, and crater lesions as well as precursors of the latter. Unexpanded Xience V and Endeavor Resolute mainly revealed crater lesions and their precursors.
Conclusion: SEM assessment demonstrated the presence of various coating irregularities and/or their precursors on unexpanded durable polymer-based DES. These findings provide evidence that coating irregularities arise during both DES manufacturing and stent expansion.
| Original language | English |
|---|---|
| Pages (from-to) | B122-B122 |
| Number of pages | 1 |
| Journal | Journal of the American College of Cardiology |
| Volume | 58 |
| Issue number | 20, Suppl. |
| DOIs | |
| Publication status | Published - 8 Nov 2011 |
| Event | 23rd Annual Scientific Symposium of Transcatheter Cardiovascular Therapeutics, TCT 2011 - San Francisco, United States Duration: 7 Nov 2011 → 11 Nov 2011 Conference number: 23 |
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Keywords
- METIS-282971
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TCT-448: Scanning Electron Microscopic Observation of Coating Irregularities and Their Precursors in Unexpanded Durable Polymer-Based Drug-Eluting Stents. / Basalus, Mounir W.Z.; Tandjung, Kenneth; Sen, Hanim; van Westen, Thea; Grijpma, Dirk W.; van Apeldoorn, Aart A.; von Birgelen, Clemens.
In: Journal of the American College of Cardiology, Vol. 58, No. 20, Suppl., 08.11.2011, p. B122-B122.Research output: Contribution to journal › Meeting Abstract › Academic
TY - JOUR
T1 - TCT-448: Scanning Electron Microscopic Observation of Coating Irregularities and Their Precursors in Unexpanded Durable Polymer-Based Drug-Eluting Stents
AU - Basalus, Mounir W.Z.
AU - Tandjung, Kenneth
AU - Sen, Hanim
AU - van Westen, Thea
AU - Grijpma, Dirk W.
AU - van Apeldoorn, Aart A.
AU - von Birgelen, Clemens
PY - 2011/11/8
Y1 - 2011/11/8
N2 - Background: Previous scanning electron microscopy (SEM) studies in expanded DES revealed differences in the frequency and size of coating irregularities between DES types and specific distribution patterns, however, the origin of these irregularities is unclear.The current study quantifies coating irregularities on unexpanded and expanded durable polymer-based drug-eluting stents (DES) to gain insights into the potential origin of coating irregularities.Methods:We assessed at bench side a total of 1200 SEM images obtained in 30 DES samples (15 expanded and 15 unexpanded) of Cypher Select, Taxus Liberté, Endeavor, Xience V, and Resolute.Results: For most types of coating irregularities seen on expanded DES (72%; 23/32), a matching irregularity (n=18/24) and/or its precursor (n=11/24) was observed in unexpanded corresponding DES. Only a few individual coating irregularities (13%; 4/32) could not be accessed in unexpanded samples, as these irregularities were located on the (invisible) luminal side. Unexpanded Cypher Select showed (small) crater lesions and cracks together with precursors of ‘peeling of polymer’. On unexpanded Taxus Liberté, thinning of polymer, small bare metal areas, wrinkles and one type of precursor was found. Unexpanded phosphorylcholine-based Endeavor stents showed cracks, small bare metal areas, and crater lesions as well as precursors of the latter. Unexpanded Xience V and Endeavor Resolute mainly revealed crater lesions and their precursors.Conclusion: SEM assessment demonstrated the presence of various coating irregularities and/or their precursors on unexpanded durable polymer-based DES. These findings provide evidence that coating irregularities arise during both DES manufacturing and stent expansion.
AB - Background: Previous scanning electron microscopy (SEM) studies in expanded DES revealed differences in the frequency and size of coating irregularities between DES types and specific distribution patterns, however, the origin of these irregularities is unclear.The current study quantifies coating irregularities on unexpanded and expanded durable polymer-based drug-eluting stents (DES) to gain insights into the potential origin of coating irregularities.Methods:We assessed at bench side a total of 1200 SEM images obtained in 30 DES samples (15 expanded and 15 unexpanded) of Cypher Select, Taxus Liberté, Endeavor, Xience V, and Resolute.Results: For most types of coating irregularities seen on expanded DES (72%; 23/32), a matching irregularity (n=18/24) and/or its precursor (n=11/24) was observed in unexpanded corresponding DES. Only a few individual coating irregularities (13%; 4/32) could not be accessed in unexpanded samples, as these irregularities were located on the (invisible) luminal side. Unexpanded Cypher Select showed (small) crater lesions and cracks together with precursors of ‘peeling of polymer’. On unexpanded Taxus Liberté, thinning of polymer, small bare metal areas, wrinkles and one type of precursor was found. Unexpanded phosphorylcholine-based Endeavor stents showed cracks, small bare metal areas, and crater lesions as well as precursors of the latter. Unexpanded Xience V and Endeavor Resolute mainly revealed crater lesions and their precursors.Conclusion: SEM assessment demonstrated the presence of various coating irregularities and/or their precursors on unexpanded durable polymer-based DES. These findings provide evidence that coating irregularities arise during both DES manufacturing and stent expansion.
KW - METIS-282971
U2 - 10.1016/j.jacc.2011.10.458
DO - 10.1016/j.jacc.2011.10.458
M3 - Meeting Abstract
VL - 58
SP - B122-B122
JO - Journal of the American College of Cardiology
JF - Journal of the American College of Cardiology
SN - 0735-1097
IS - 20, Suppl.
ER -