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A Robotic System for Actively Stiffening Flexible Manipulators.
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A system for actively changing the stiffness of a long, thin, flexible robotic manipulator has been designed for cardiologists to use in a range of diagnosis and treatment procedures. Low-stiffness manipulators, such as catheters, are ideal for steering through vasculature with low risk of tissue injury. However, such instruments are not well-suited for applying force to tissue.
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Department of Radiological Sciences, University of Oklahoma Health Sciences Center, Oklahoma City 73190-3020, USA.
We have identified 12 patients with endocardial cushion defect and marked under-development of the left ventricle. Most of these patients had significant obstructive anomalies of the aortic arch. Pathologically, the left ventricle was very small, but without endocardial fibroelastosis, significant subaortic narrowing was evident, resulting from maladherent atrioventricular valve tissue to the left ventricular outflow tract, and the left ventricular posterior leaflet component of the atrioventricular valve was both grossly deficient and dysplastic.
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