Introduction In the rapidly developing field of interventional MR, there has been growing concern about RF-induced heating in metallic devices[3]. In the work reported here, we concentrate on the RF heating of a widely used intravascular guidewire, the Terumo guidewire (Tokyo, Japan), having a nitinol (Nickel-Titanium) core. Since nitinol is not ferromagnetic, the Terumo meets an important cond...

BACKGROUND Regenerative cell-based therapies are associated with limited myocardial retention of delivered stem cells. The objective of this study is to develop an endocardial delivery system for enhanced cell retention. METHODS AND RESULTS Stem cell retention was simulated in silico using 1- and 3-dimensional models of tissue distortion and compliance associated with delivery. Needle designs...

BACKGROUND It is yet to be determined what effects temperature has on the properties of nitinol in order to simplify the process of removing nitinol self-expanding metal stents (SEMS). MATERIALS AND METHODS We describe the procedure for removal of SEMS in a total of 11 cases with 9 patients. A study involving cooling of nitinol stents in situ with ice water just before their removal was attem...

PURPOSE To compare stone retrieval and release from seven basket designs in vitro. MATERIALS AND METHODS We tested two tipped and one tipless NCompass models, three other tipless Nitinol designs (NCircle, Sur-Catch, and Dimension), and the Segura Hemisphere for their ability to retrieve and release single beads 8, 6, 5.6, and 5 mm diameter and multiple beads 3.6 mm diameter in both a ureteral...

Modern Angioplasty is an alternative to bypass heart surgery because of safety and validity. As we know that the Heart diseases has risen to become that number of deaths in most of the developing or developed countries due to the high increase rates of obesity, drug dependence, and diabetes. Stents are used throughout the body but the most critical area being coronary arteries. Convention Mater...

The incidence of post-renal transplantation ureteral stenosis ranges from 2%-12%. Because the role of self-expanding ureteral metallic stents for its treatment has been scarcely reported, the aim of this study was to evaluate the efficacy of Nitinol stents. Eleven ureteral stenoses in patients with chronic graft dysfunction (8 cases) or high surgical risk (3 cases) were treated by antegrade per...

AIMS The purpose of this prospective clinical investigation was to quantify the degree and range of compressive and bending deformations sustained by self-expanding nitinol stents when implanted into the femoropopliteal arteries of patients with symptomatic peripheral vascular disease (PVD). METHODS AND RESULTS Twenty-three nitinol self-expanding stents (Absolute; Abbott Vascular, Santa Clara...

OBJECTIVE To evaluate a new posterior atlantoaxial fixation technique using a nitinol shape memory loop as a simple method that avoids the risk of vertebral artery or nerve injury. METHODS We retrospectively evaluated 14 patients with atlantoaxial instability who had undergone posterior C1-2 fusion using a nitinol shape memory loop. The success of fusion was determined clinically and radiolog...

External reinforcement has been suggested for autologous vein grafts to address the mismatch of mechanical properties and fluid dynamics of graft and host vessel, a main factor for graft failure. A finite-element tool was developed to investigate the mechanical behaviour, in particular radial compliance, of knitted Nitinol meshes (internal diameter: 3.34 mm) with two different knit designs (eve...

CASE DESCRIPTION 2 cats were examined because of congestive heart failure secondary to heartworm infection. CLINICAL FINDINGS One cat had severe abdominal distention and the other had dyspnea secondary to chylothorax. Both had loud right-sided heart murmurs, precordial thrills, and jugular distension. Thoracic radiography revealed cardiomegaly and enlarged caudal pulmonary arteries. Echocardi...