Microdevices for extensional rheometry of low viscosity elastic liquids : a review

Extensional flows and the underlying stability/instability mechanisms are of extreme relevance to the efficient operation of inkjet printing, coating processes and drug delivery systems, as well as for the generation of micro droplets. The development of an extensional rheometer to characterize the extensional properties of low viscosity fluids has therefore stimulated great interest of researchers, particularly in the last decade. Microfluidics has proven to be an extraordinary working platform and different configurations of potential extensional microrheometers have been proposed. In this review, we present an overview of several successful designs, together with a critical assessment of their capabilities and limitations

User-Centered Development of HEARTPrep, a Digital Health Psychosocial Intervention for Prenatally Diagnosed Congenital Heart Disease

User-centered models for the development of digital health interventions are not consistently applied in healthcare settings. This study used a five-phase, user-centered approach to develop HEARTPrep © , a psychosocial intervention delivered via mobile app and telehealth to mothers expecting a baby with congenital heart disease (CHD) to promote maternal, family, and child well-being. Phases of intervention development were: (I) establishing partnerships; (II) creating content; (III) developing prototype and testable intervention; (IV) conducting think-aloud testing; and (V) completing beta testing. Partnerships with parents, clinicians, and design/technology experts were integral throughout the development of HEARTPrep © . Parents of children with CHD also served as participants in Phases II-V, contributing to the creation of content and providing feedback to inform the iterative refinement of HEARTPrep © . These five phases produced a refined digital health intervention with promising feasibility, usability, and acceptability results. This user-centered approach can be used to develop digital health interventions targeting various health outcomes