Clinical case of hybrid treatment for a saccular aneurysm of the aortic arch

The article presents a clinical case of a staged hybrid treatment for an aortic arch aneurysm in patient who previously underwent coronary artery bypass grafting and exoplasty of the ascending aorta. Possible alternative treatment options for this pathology are reviewed, and the features of surgical and endovascular treatment are also described.

SBR Vulcanizates Filled with Modified Ground Tire Rubber

Ground tire rubber (GTR) is used to decrease the cost of vulcanizates. However, insufficient interactions between GTR particles and rubber matrices make mechanical properties of vulcanizates containing GTR deteriorate. This paper compares original methods of GTR modification. The effects of surface activation of GTR by sulfuric acid (A), its modification by (3-mercaptopropyl)trimethoxy silane (M), or the hybrid treatment—combining both approaches (H), were analyzed in terms of surface energy, specific surface area and morphology of GTR particles. Vulcanizates containing virgin GTR were compared to the rubber filled with the modified GTR particles keeping the same amount of CB in the rubber mix, according to their crosslink density, mechanical and tribological properties. Contrary to the virgin GTR, the addition of modified GTR increases the stiffness of the vulcanizates. The highest changes have been observed for the samples filled with ca. 12 phr of the GTR modified with silane and ca. 25 phr of the GTR subjected to the hybrid treatment, representing the highest crosslink density of rubber vulcanizates filled with GTR. Furthermore, the addition of modified GTR, especially in the case of the samples where 10 phr of rubber was replaced, results in the significant lowering of friction but higher abrasive wear.

The first case of renal artery prosthetics using a vascular stent graft during renovisceral debranching

The article demonstrates the first clinical case of using the vascular stent graft in renal artery prosthetics in the framework of hybrid treatment of a patient with Stanford B type aortic dissection with renovisceral debranching and subsequent aortic endoprosthetics. Currently available approaches to nephropothecation in prosthetics of renal arteries, surgical technique for using the graft, and the features and advantages of its use are described. The place of this new technique in the surgery of thoracoabdominal aorta is discussed.