US 11,980,739 B2
Double-acting, telescoping screw-driven pump mechanism disposed externally to reservoir in fluid delivery device
Alessandro Pizzochero, Chelmsford, MA (US); Mark Wood, Sterling, MA (US); Muzaffer Yalgin Ozsecen, Groton, MA (US); Timothy Blum, Columbus, OH (US); Eric Hassenpflug, Westerville, OH (US); Cory Baker, Westerville, OH (US); and Jeffrey Held, Columbus, OH (US)
Assigned to Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed by Becton, Dickinson and Company, Franklin Lakes, NJ (US)
Filed on Aug. 13, 2021, as Appl. No. 17/401,871.
Claims priority of provisional application 63/066,832, filed on Aug. 18, 2020.
Prior Publication US 2022/0054739 A1, Feb. 24, 2022
Int. Cl. A61M 5/145 (2006.01); A61M 5/142 (2006.01)
CPC A61M 5/1452 (2013.01) [A61M 5/14236 (2013.01); A61M 5/14248 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A fluid delivery device comprising:
a reservoir comprising an outlet port at a distal end, and a plunger movable along a longitudinal axis of the reservoir, the plunger configured to provide a seal with respect to inner walls of the reservoir to prevent fluid provided in a fluid chamber defined on a first side of the plunger and comprising the outlet port from leaking into a portion of the reservoir defined by a second side of the plunger; and
a plunger driver assembly mounted at a proximal end of the reservoir and comprising telescoping, simultaneously counter-rotating screws having similar pitch and lead parameters that, when a threaded nut is rotated, move from a nested configuration that does not extend into the reservoir to an extended configuration that extends into the reservoir at a rate of double the individual pitch and lead parameters of the respective screws.