Abstract
Abstract The expansion capacity and accessibility of the side branch is essential for the stenting of complex bifurcations. Since previous measurement methods only provide limited information based on geometrical data of stent cells, a new measurement approach was developed which considers the mechanical deformation capacity of the stent design. This approach provides essential information on the stent with regard to the application of bifurcation stenting. Four different commercially available coronary stents (nominal diameter 3.0 mm) were dilated and a central strut cell was over-expanded by means balloon catheters of increasing nominal diameter (2.0 to 5.0 mm). After balloon inflation, the remaining cell size was investigated for maximum cell diameter and strut fractures. Large expansion capacity without cell damage is taken as a measure of the accessibility of the side branch. In none of the expansion experiments the desired target size could be achieved, which is due to the elastic recoil of the stent cells. Deviations from the target diameter between 14-38% were determined. However, larger diameters also showed a constriction of the balloon, so that in some cases the target diameter could not be achieved at all. No strut fractures occurred even at maximum balloon diameter and pressure (5.0 mm noncompliant balloons). As a result the side branch accessibility differs depending on the individual stent designs. No particular risk for the stent was found by extensive overdilatation.
Highlights
The term over-expansion capacity of stent designs is used to evaluate how the stent geometry changes when overdilatation is performed [1,2]. This parameter is suggested in the context of bifurcation stenting for the selection of suitable stents [3], including a description of how side branch accessibility changes when over-dilatation occurs
The balloon pressure corresponds to the nominal pressure of the balloon (NP) and the expected maximum balloon diameter corresponds to the nominal diameter of the balloon
On the one hand this is due to the constriction of the balloons which was especially seen with large balloon diameters
Summary
The term over-expansion capacity of stent designs is used to evaluate how the stent geometry changes when overdilatation is performed [1,2] This parameter is suggested in the context of bifurcation stenting for the selection of suitable stents [3], including a description of how side branch accessibility changes when over-dilatation occurs (cell opening). This is a common approach in various kinds of bifurcation stenting, in which the side branch has to be stented . This side-branch accessibility was tested by an approach similar to above-mentioned, namely without extra mechanical stress by a penetrating balloon / stent system (catheter) for the “side-branch-struts”.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
