Medication dispensing apparatus with triple screw threads...

Details Medication dispensing apparatus with triple screw threads... Medication dispensing apparatus with triple screw threads...

2007-09-28

2008-09-23

Lucchesi, Nicholas D. (Department: 3763)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C604S211000, C604S187000

Reexamination Certificate

active

07427275

ABSTRACT:
A medication dispensing apparatus that provides a mechanical advantage. During dose preparing, a nut rotating element (410) and a screw element (368) are in a first axial arrangement such that a screwing motion of the nut rotating element and screw element relative to the apparatus housing that moves the elements a first axial distance from a home position screws a nut (364) along a drive member threaded shaft (362) a second axial distance different than the first axial distance. During dose dispensing, the nut rotating element and the screw element are in a second axial arrangement, whereby a screwing motion of the screw element relative to the housing back toward the home position advances a plunger (366) in the distal direction to axially advance the nut and thereby the drive number and a fluid container piston to dispense medicine.

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