Abstract

Stents were manufactured to investigate the impact of altering stent design characteristics (leg length, bend angle, bend radius, and wire diameter) on radial force generation. Results from this design parameter study showed that leg length, bend angle, and wire diameter have a statistically significant impact on radial force generation, while lesser changes in bend radius did not (1.00 mm versus the original 0.794 mm). However, a larger variation of this parameter (1.588 mm) was statistically significant. Results gathered for all parameters were used in the creation of a prototypal software. Using input values of patient-specific arterial diameter and compliance, as well as stent design characteristic dimensions, this program has been developed to predict stent radial force at varying levels of expansion.

References

1.
Hinchliffe
,
R. J.
, and
Hopkinson
,
B. R.
,
2007
, “
Development of Endovascular Stent-Grafts
,”
Proc. Inst. Mech. Eng. H: J. Eng. Med.
,
221
(
6
), pp.
547
560
.10.1243/09544119JEIM169
2.
Desai
,
M.
,
Eaton-Evans
,
J.
,
Hillery
,
C.
,
Bakhshi
,
R.
,
You
,
Z.
,
Lu
,
J.
,
Hamilton
,
G.
, and
Seifalian
,
A. M.
,
2010
, “
AAA Stent-Grafts: Past Problems and Future Prospects
,”
Ann. Biomed. Eng.
,
38
(
4
), pp.
1259
1275
.10.1007/s10439-010-9953-1
3.
Harris
,
P. L.
,
Vallabhaneni
,
S.
,
Desgranges
,
P.
,
Becquemin
,
J.-P.
,
van Marrewijk
,
C.
, and
Laheij
,
R. J.
,
2000
, “
Incidence and Risk Factors of Late Rupture, Conversion, and Death After Endovascular Repair of Infrarenal Aortic Aneurysms: The EUROSTAR Experience
,”
J. Vasc. Surg.
,
32
(
4
), pp.
739
749
.10.1067/mva.2000.109990
4.
Chuter
,
T. A.
,
2002
, “
Stent-Graft Design: The Good, the Bad and the Ugly
,”
Cardiovasc. Surg.
,
10
(
1
), pp.
7
13
.10.1016/S0967-2109(01)00120-X
5.
Corbett
,
T. J.
,
Callanan
,
A.
, and
McGloughlin
,
T. M.
,
2011
, “
In Vitro Measurement of the Axial Migration Force on the Proximal End of a Bifurcated Abdominal Aortic Aneurysm Stent-Graft Model
,”
Proc. Inst. Mech. Eng., Part H: J. Eng. Med.
,
225
(
4
), pp.
401
409
.10.1177/09544119JEIM748
6.
Corbett
,
T. J.
,
Callanan
,
A.
,
Morris
,
L. G.
,
Doyle
,
B. J.
,
Grace
,
P. A.
,
Kavanagh
,
E. G.
, and
McGloughlin
,
T. M.
,
2008
, “
A Review of the In Vivo and In Vitro Biomechanical Behavior and Performance of Postoperative Abdominal Aortic Aneurysms and Implanted Stent-Grafts
,”
J. Endovascu. Ther.
,
15
(
4
), pp.
468
484
.10.1583/08-2370.1
7.
Fallone
,
B.
,
Wallace
,
S.
, and
Gianturco
,
C.
,
1988
, “
Elastic Characteristics of the Self-Expanding Metallic Stents
,”
Invest. Radiol.,
23
(
5
), pp.
370
376
.10.1097/00004424-198805000-00008
8.
Sawada
,
S.
,
Saito
,
S.
,
Kotani
,
K.
,
Fujiwara
,
Y.
,
Tanigawa
,
N.
,
Katsube
,
Y.
, and
Nakamura
,
H.
,
1990
, “
Study of the Physical Properties of Expandable Metallic Stents
,”
Radiat. Med.
,
9
(
6
), pp.
213
216
.https://pubmed.ncbi.nlm.nih.gov/1823394/
9.
Snowhill
,
P. B.
,
Nosher
,
J. L.
,
Siegel
,
R. L.
, and
Silver
,
F. H.
,
2001
, “
Characterization of Radial Forces in Z Stents
,”
Invest. Radiol.
36
(
9
), pp.
521
530
.10.1097/00004424-200109000-00004
10.
Johnston
,
C.
,
Lee
,
K.
,
Flewitt
,
J.
,
Moore
,
R.
,
Dobson
,
G.
, and
Thornton
,
G.
,
2010
, “
The Mechanical Properties of Endovascular Stents: An In Vitro Assessment
,”
Cardiovasc. Eng.
,
10
(
3
), pp.
128
135
.10.1007/s10558-010-9097-9
11.
Shu
,
C.
,
He
,
H.
,
Li
,
Q. M.
,
Li
,
M.
,
Jiang
,
X. H.
, and
Luo
,
M. Y.
,
2011
, “
Endovascular Repair of Complicated Acute Type-b Aortic Dissection With Stentgraft: Early and Mid-Term Results
,”
Eur. J. Vasc. Endovasc.Surg.
,
42
(
4
), pp.
448
453
.10.1016/j.ejvs.2011.05.013
12.
Swee
,
W.
, and
Dake
,
M. D.
,
2008
, “
Endovascular Management of Thoracic Dissections
,”
Circulation
,
117
(
11
), pp.
1460
1473
.10.1161/CIRCULATIONAHA.107.690966
13.
Jean-Baptiste
,
R.
,
Williams
,
D.
, and
Gemmete
,
J.
,
2011
, “
Successful Treatment of Superior Vena Cava Rupture With Placement of a Covered Stent: A Report of Two Cases
,”
Cardiovasc. Interven. Radiol.
,
34
(
3
), pp.
667
671
.10.1007/s00270-011-0128-8
14.
Dendo
,
S.
,
Inaba
,
Y.
,
Arai
,
Y.
,
Matsueda
,
K.
,
Aramaki
,
T.
,
Tanaka
,
T.
,
Furutani
,
K.
, and
Fuwa
,
N.
,
2002
, “
Severe Obstruction of the Superior Vena Cava Caused by Tumor Invasion Recanalization Using a PTFE-Covered Z Stent
,”
J. Cardiovasc. Surg.
,
43
(
2
), pp.
287
90
.https://pubmed.ncbi.nlm.nih.gov/11887072/
15.
U.S. Food and Drug Administration
,
2003
, “
Summary of Safety and Effectiveness Data. Zenith Fenestrated AAA Endovascular Graft and Zenith Alignment Stent
,” U.S. Food and Drug Administration, Silver Spring, MD, accessed May 29, 2015, http://www.accessdata.fda.gov/cdrh_docs/pdf2/P020018S040b.pdf
16.
ASTM,
2015
, Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications,
ASTM International
,
West Conshohocken, PA
, p.
3
, Standard No.
A240A240M-15a
.https://www.astm.org/DIGITAL_LIBRARY/TECHNICAL_REPORTS/index.html
17.
Scott
,
J. C. R.
,
Johnston
,
C. R.
, and
Doman
,
D. A.
,
2014
, “
Design of a Mechanically Correct Self-Expanding Endovascular Stent: 1. A Look at Radial Force Inconsistencies
,” Proceedings of the 7th World Congress of Biomechanics, Boston, MA, July 6–11.
18.
Gurley
, K. R., 2001, “
Numerical Methods Lecture 5—Curve Fitting Techniques
,” University of Florida, Gainesville, FL, Report No.
CGN 3421
.https://legacy.essie.ufl.edu/~kgurl/Classes/Lect3421/Fall_01/NM5_curve_f01.pdf
19.
Scott
,
J. C. R.
,
Johnston
,
C. R.
, and
Doman
,
D. A.
,
2014
, “
Design of a Mechanically Correct Self-Expanding Endovascular Stent: A Look at Radial Force Inconsistencies and Finite Element Modeling
,” Proceedings of the Seventh Annual Dalhousie University Mechanical Engineering Research Conference, Halifax, NS, Canada, July 3–6.
You do not currently have access to this content.