Rapid manufacturing techniques in the development of an axial blood pump impeller
Abstract This paper presents a comparison of manufacturing techniques used in the development of an axial blood pump impeller. In this development process the impeller was designed and its performance was evaluated with the aid of computational fluid dynamics (CFD). Prototypes of those designs where the CFD results show promise were needed in sufficient quantities at a low cost for experimental validation of the CFD results. As the impeller is less than 16 mm in diameter with a maximum blade thickness of about 1.5 mm, innovative manufacturing techniques are explored in this paper to determine the best process for quick fabrication of prototypes that are dimensionally accurate, structurally robust and low in cost. Four rapid prototyping techniques were explored. The completed parts were compared on the basis of manufacturing time, quality and strength of parts obtained, manufacturing cost and also in vitro performances. Based on these studies, it was concluded that selective laser sintering (SLS) is the most appropriate method for the quick production of prototype parts for evaluation of pump performance.
3D Printing to Guide Ventricular Assist Device Placement in Adults With Congenital Heart Disease and Heart Failure.
As the population of adults with congenital heart disease continues to grow, so does the number of these patients with heart failure. Ventricular assist devices are underutilized in adults with congenital heart disease due to their complex anatomic arrangements and physiology. Advanced imaging techniques that may increase the utilization of mechanical circulatory support in this population must be explored. Three-dimensional printing offers individualized structural models that would enable pre-surgical planning of cannula and device placement in adults with congenital cardiac disease and heart failure who are candidates for such therapies. We present a review of relevant cardiac anomalies, cases in which such models could be utilized, and some background on the cost and procedure associated with this process.
Religion, Law and Society
Issues concerning religion in the public sphere are rarely far from the headlines. As a result, scholars have paid increasing attention to religion. These scholars, however, have generally stayed within the confines of their own respective disciplines. To date there has been little contact between lawyers and sociologists. Religion, Law and Society explores whether, how and why law and religion should interact with the sociology of religion. It examines sociological and legal materials concerning religion in order to find out what lawyers and sociologists can learn from each other. A groundbreaking, provocative and thought-provoking book, it is essential reading for lawyers, sociologists and all who are interested in the relationship between religion, law and society in the twenty-first century.