Multi-stable valves for medical applications and methods for...

Details Multi-stable valves for medical applications and methods for... Multi-stable valves for medical applications and methods for...

2004-01-13

2009-08-04

Lucchesi, Nicholas D (Department: 3763)

Surgery

Controlled release therapeutic device or system

C251S129010

Reexamination Certificate

active

07569049

ABSTRACT:
The invention relates to multi-stable valves and methods for their use. The multi-stable valves may include a movable physical stop and a position arm. The physical stop may be placed in the path of the arm effectively locking the valve in at least one position upon deactivation of the valve's motivating forces. The valve may be, for example, a micro valve or a microelectromechanical device. Such a valve may be used in implantable drug infusion applications and other applications having limitations on available energy. In one exemplary embodiment, the valve comprises a membrane separating two channels. The membrane may be lifted by activation of a piezo material, opening the channels for fluid flow. A physical stop may be moved into place and the piezo material deactivated, bringing to rest the arm on the physical stop. In this manner, the valve is stabilized in the open position without requiring continuous supply of energy.

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patent: 6589205 (2003-07-01), Meadows
patent: 2002/0072733 (2002-06-01), Flaherty

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