Surgery – Controlled release therapeutic device or system – Implanted dynamic device or system
Reexamination Certificate
2006-02-14
2006-02-14
Hayes, Michael J. (Department: 3763)
Surgery
Controlled release therapeutic device or system
Implanted dynamic device or system
C604S152000
Reexamination Certificate
active
06997921
ABSTRACT:
A drive mechanism for delivery of infusion medium has a coil and an armature moveable toward a forward position, in response to the electromagnetic field produced by activation of the coil. A piston is moveable axially within a piston channel to a forward position, in response to movement of the armature to its forward position. The armature and piston are moved toward a retracted position, when the coil is not energized. In the retracted position of the piston, a piston chamber is formed between the piston and a valve member and is filled with infusion medium. As the piston is moved to its forward position, the piston chamber volume is reduced and pressure within the piston chamber increases to a point where the pressure moves the valve member into an open position through an outlet.
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PCT International Search Report as issued in International Application No. PCT/US02/28081, Mailing date Jun. 18, 2003.
PCT International Search Report as issued in International Application No. PCT/US02/28081, Mailing date Jun. 18, 2003.
Bosley Robert W.
Gray John F.
Hayes Michael J.
Medtronic Minimed Inc.
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