We report on an electrical microfluidic pressure gauge. A polydimethylsiloxane microvalve closes at a characteristic applied pressure determined by the material's properties and the valve's dimensions. Hence, when the same pressure is applied to all valves of a heterogeneous valve array, some valves close while others remain open. The state of the array is combined with knowledge of the respect...

In filling lines equipped with membrane separation devices in the form of filters energy, consumption is only one important working parameters, other being sustainable filter performance terms efficiency. As line typically a valve, intermittent operation an its use. Whereas overall energy filtration process governed by continuous mode, characterised opening/closing contributes most to problems ...

The Carpentier-Edwards pericardial bioprosthesis has been markedly improved in the long-term results and valve-related complications including valve dysfunction, compared to the previous generation bioprosthesis. We report a patient in whom transient prosthetic valve regurgitation and hemolysis occurred early after mitral valve replacement using a Carpentier-Edwards pericardial bioprosthesis an...

Native Aortic Valve Leaflets Chi Zheng, M1 University of Pittsburgh; BSE University of Michigan In association with: John A. Stella and Michael S. Sacks, Ph. D. Department of Bioengineering, University of Pittsburgh June.16.2006 Introduction The mammalian heart is a four-chambered pulsating pump that circulates the blood within two parallel loops: the systemic and the pulmonary circulation. Blo...

By using an axisymmetric model, we numerically investigate the underlying fluid dynamics of a salp-like swimmer consisting deformable shell, front valve, and back valve. Through coordinated shell inflation/deflation valve opening/closing, uni-directional flow is created inside body in wake, which provides thrust for forward motion. Our results prove that this method capable sustained locomotion...

In this work, we introduce a novel boundary-conforming mesh-update method that is particularly designed for problems with large boundary displacements and topology changes. This method, which call the surface-reconstruction virtual-region mesh update integrates virtual region approach surface reconstruction process to handle complex movements. The allows having an activated deactivated part of ...

Functional mitral regurgitation (MR) is a common finding in patients with global left ventricular (LV) dilatation and dysfunction. In these patients, the mitral leaflets are structurally normal and leaflet coaptation failure results from an imbalance between valve closing forces and valve tethering forces. Impaired LV contractility, global LV dyssynchrony, and reduced mitral annulus systolic co...

Background—Common 3D systems have only limited spatial and temporal resolution (frame rate of 25 Hz). Thin structures such as cardiac valves are not imaged exactly; rapid movement patterns cannot be precisely recorded. The objective of the present project was to achieve radiofrequency (RF) data transmission to the 3D workstation to improve image resolution. Methods and Results—A commercially av...

Valves play a critical role in a water distribution system for subsystem isolation and flow or pressure control. Among them, subsystem isolation is required to repair or to rehabilitate a broken component and can be done by closing adjacent valves. To evaluate the role of valves, the concept of “Segment” is necessary. A segment consists of a set of pipes and nodes isolated together by closing a...

BACKGROUND Common 3D systems have only limited spatial and temporal resolution (frame rate of 25 Hz). Thin structures such as cardiac valves are not imaged exactly; rapid movement patterns cannot be precisely recorded. The objective of the present project was to achieve radiofrequency (RF) data transmission to the 3D workstation to improve image resolution. METHODS AND RESULTS A commercially ...