Vascular implants for peripheral arterial bypass and aortic aneurysm repair - Biomaterials and Devices for the Circulatory System - page 229

Table 8.4 Range of commercial stent-grafts

Device
manufacturer

Graft
material

Stent
support

Hooks/
barbs Confi guration Availability

Anaconda
Vascutek

WP NiTi-C Proximal Modular Yes

Ancure
Guidant

WP None Proximal

& distal

Unibody Withdrawn

Aneurx
Medtronic

WP NiTi-Z None Modular Yes

Aorfi x
Lombard

WP NiTi-C Proximal Modular Yes

Powerlink
Endologix

PTFE SS-Z None Unibody Yes

Endurant
Medtronic

WP NiTi-Z Proximal Modular Yes

Excluder
Gore

PTFE NiTi-Z Proximal Modular Yes

Lifepath
Edwards

WP Elgiloy-Z None Modular Withdrawn

Talent
Medtronic

WP NiTi-Z None Modular Yes

Zenith Cook WP SS-Z Proximal Modular Yes

WP, woven PET fabric; NiTi-C, nickel-titanium wire in a circular/helical
confi guration; NiTi-Z, nickel-titanium in a z-shape; SS, stainless steel.

better insight is gained continuously. There is also a risk of late failure of
treatment, resulting in the need for life-long surveillance with a view to
identifying impending failure so that remedial action can be instituted. In
order to preserve the early benefi ts of EVAR, there is a necessity to prevent
late failure and death.
The component materials and some design features of different com-
mercial stent-grafts are given in Table 8.4. The materials used for the graft
are woven PET fabric grafts and ePTFE. The advantage of ePTFE is that
it has low porosity, relatively thin wall and yet strong. The woven fabric
materials used vary in thickness and strength. Although a thin fabric graft
can be compacted more tightly, thereby requiring a small and fl exible deliv-
ery system, the disadvantage is that its durability may be compromised and
some designs such as the Zenith uses a standard woven PET fabric found
in surgical vascular grafts. The metallic stent is of fundamental importance
to the endograft and its function is to provide structural integrity to the
whole device thereby ensuring support for the graft component and stable
fi xation. It is important that the mechanical and physical properties of
the stent are not impaired after implantation. Most stents use zigzag
or z-confi guration except for the Anaconda TM (Vascutek Ltd, Inchinan,

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