Coanda effect in valves

Coanda effect on ductal flow in the pulmonary artery.

The Coanda effect (the tendency of a jet stream to adhere to a boundary wall), and the relevant anatomy, may explain the location of ductal jets within the main pulmonary artery. With the usual insertion of the duct close to the left pulmonary artery, during right ventricular ejection, the ductal jet adheres to the left wall of the main pulmonary artery. When right ventricular ejection is absen...

Operative treatment of aneurysms and Coanda effect: a working hypothesis.

The Coanda effect has been known to mechanical engineers for many decades. Consideration of this effect both by a neurosurgeon and a mechanical engineer revealed that it might be of importance during the operative treatment of intracranial aneurysms. If a jet effect were produced in the stream of blood after clipping an aneurysm, most of the flow of blood might be directed down only one limb of...

An explanation of asymmetric upper extremity blood pressures in supravalvular aortic stenosis: the Coanda effect.

The effect of aging on venous valves.

OBJECTIVE Age is the strongest risk factor for venous thrombosis. Vessel wall changes such as thickening of venous valves may be one of the contributing mechanisms. We determined thickness and function of venous valves in the popliteal vein with ultrasound in 77 healthy individuals. METHODS AND RESULTS The study included 6 age groups ranging from 20 to 80 years old. Thickness of the valves wa...

Effect of Varying Urethane Thickness on Valves

On-board pneumatic valves produced with laminate fabrication processes provide a cost effective way to perform metering mixing and gating of fluid movement in Lab on a chip devices. These valves can be used in multiplexed molecularor immunoassays where successive reagent additions and/or washes are needed. The laminate valve assembly, produced in a batch fabrication process, is combined with an...