A synthetic jet is formed as a consequence of a periodic – say sinusoidal – expulsion and extraction of fluid through an orifice, so that the time-averaged flow rate through the orifice is zero. Despite the zero mean mass flux, the sequence of injection followed by suction results in net momentum and vorticity being released into the fluid body in which the jet is generated. This is, essentiall...

Surgeons are gaining interest in natural orifice surgery because of its minimally invasive nature. The new paradigm shift of using a natural orifice, as opposed to the abdominal wall, as a conduit for entry into the abdomen has resulted in novel solutions to solving difficult surgical problems. Repetitive foreign body ingestion continues to be one of those challenging dilemmas. Ingested objects...

Intraventricular pressures were measured during brief periods of mitral orifice occlusion to determine whether or not the ventricle am exert a sucking force during diastole. This procedure was based on the premise that with a wide open mitral orifice negative diastolic transmural pressures cannot be detected in the ventricle because the adjoining atrium has collapsible walls. During mitral orif...

AGENESIS of the tricu.spid valve may occur in two forms: (1) tricuspid atresia and (2) "tunguarded tricuspid orifice." In the latter, althouigh the normal orifice between the right atritum and right ventricle exists, there is no tricuspid valvtular tissue. The purpose of this report is to describe the clinical, radiologic, and pathologic findings of suich a case in which ptulmonary atresia coex...

Intraventricular pressures were measured during brief periods of mitral orifice occlusion to determine whether or not the ventricle am exert a sucking force during diastole. This procedure was based on the premise that with a wide open mitral orifice negative diastolic transmural pressures cannot be detected in the ventricle because the adjoining atrium has collapsible walls. During mitral orif...

This research presents an multi-stage multi-orifice flow fractionation (MS-MOFF) device designed for separating breast cancer cell from blood. The structure and dimensions of the MS-MOFF were determined by the hydrodynamic principles to have consistent Reynolds numbers (Re) at each multi-orifice segment. From this device, we achieved improved separation efficiency by collecting and re-separatin...

Mitrální chlopeň se dvěma ústími (double orifice mitral valve, DOMV) je vzácná vrozená srdeční vada, obvykle spojená s jinými vrozenými malformacemi. Izolovaná DOMV byla popsána jen velmi vzácně. Prezentujeme případ 58letého muže bez předchozí historie kardiovaskulárního onemocnění, který podstoupil mitrální anuloplastiku pro významnou regurgitaci a u kterého di...