Author + information
- Eric Matthew Shurtleff,
- Mariam Vanderhyde,
- Fallon Fitzwater,
- Bassem Chehab,
- Lorin Maletsky,
- Karthik Vamanan,
- Pamela Thomas,
- Peter Tadros and
- Kamal Gupta
Stents placed in the distal Superficial Femoral Artery and Popliteal Artery are prone to fracture. The mechanics of stent deformation and differences between stent designs are unclear.
Methods and Materials
Five commercially available stents were implanted in eight unembalmed cadaveric limbs from four donors under euthermic saline arterial flow. One leg of each pair received a Lifestent® while the other leg received a different stent. Stents were deployed with lead edge 2.0 cm distal to the tibial plateau. Then each leg was placed in a Quasi–static Knee Rig and X–ray images were obtained at 70°, 90°, 120° and maximum flexion. Modified strain was calculated for these angles using the overall change in length from 0° flexion. Radii of curvature for the stents were determined using a least squares algorithm.
Two flexion points (FP) occurred in all stents except the Supera®, which showed no significant proximal FP. For all stents, with increasing flexion angles, radii of curvature associated with respective FPs decreased, and both proximal and distal FPs moved toward the joint line. In the Lifestent®, Absolute® and Protégé® stents, proximal FPs moved a greater distance than distal FPs. In the Gore® stent, the position of both FPs remained relatively constant. The Supera® stent had the lowest modified strain value.
Different stent designs show variable conformational response to knee flexion. These differences may be clinically significant in relation to long–term stent performance.
|Distal Flexion Point||Proximal Flexion Point||Modified Strain [(Length at flexion - Length at 0° flexion) /Length at 0° flexion]|
|Knee Flexion Angle||70||90||120||Max Flexion||70||90||120||Max Flexion||70||90||120||Max flexion|
|Stent Brand||Stent Length [mm]||R||D||R||D||R||D||R||D||R||D||R||D||R||D||R||D|
Moderated Poster Contributions
Poster Sessions, Expo North
Sunday, March 10, 2013, 3:45 p.m.–4:30 p.m.
Session Title: Endovascular Intervention
Abstract Category: 41. TCT@ACC–i2: Carotid, Neurovascular, and Endovascular Intervention
Presentation Number: 2109M–218
- 2013 American College of Cardiology Foundation