Liquid microvalve
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United States of America Patent
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-
May 4, 2004
Grant Date -
Dec 26, 2002
app pub date -
Jun 24, 2002
filing date -
Jun 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A valve for the control of fluid flow in microsize systems, such as for transfer of small samples of blood for processing. An actuator beam comprised of a microribbon formed of a shape memory alloy is in a normally closed position where inlet and outlet ports of the valve are closed. In this position a compliant member presses against and holds the microribbon, together with a compliant tape carried below the microribbon, against the ports. The valve is actuated by heating the alloy through its crystalline phase change transition temperature. The resulting change of the microribbon to its memory shape moves the microribbon and tape away from the ports, enabling fluid flow through between the ports in a valve-open mode. The microribbon and tape are held in the valve-open mode when the alloy cools below the transition temperature by a force applied from a heat-shrinkable layer carried on the upper side of the microribbon.
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