The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2014
Filed:
Jun. 30, 2005
John Gray, Woodland Hills, CA (US);
Robert W. Bosley, Cerritos, CA (US);
John Gray, Woodland Hills, CA (US);
Robert W. Bosley, Cerritos, CA (US);
Medtronic Minimed, Inc., Northridge, CA (US);
Abstract
A drive mechanism for delivery of infusion medium has a coil and an armature movable toward a forward position, in response to the electromagnetic field produced by activation of the coil. A piston is movable 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.