US 12,329,927 B2
Multiple telescoping screw-driven pump mechanism with anti-rotation of innermost screw keyed to reservoir plunger in fluid delivery device
Mark Wood, Sterling, MA (US); Dana Cote, Boxford, MA (US); and Alessandro Pizzochero, Chelmsford, MA (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. 17/401,876.
Claims priority of provisional application 63/066,851, filed on Aug. 18, 2020.
Prior Publication US 2022/0054740 A1, Feb. 24, 2022
Int. Cl. A61M 5/145 (2006.01); A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/1452 (2013.01) [A61M 5/3129 (2013.01); A61M 5/31511 (2013.01); A61M 5/31528 (2013.01); A61M 5/31535 (2013.01)] 28 Claims
OG exemplary drawing
 
1. A fluid delivery device comprising:
a reservoir configured to be preinstalled in a housing of the fluid delivery device and unremoveable therefrom, the reservoir comprising an outlet port at a distal end, and 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 by a first side of the plunger and that comprises 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 a plurality of nested, telescoping screws that, when an outermost drive screw is rotated, move from a nested configuration that does not extend into the reservoir to an extended configuration that extends from the proximal end of the reservoir into the reservoir;
wherein the plurality of nested, telescoping screws comprises an innermost screw that is connected to the plunger and constrained from rotation by an anti-rotation mechanism;
wherein the reservoir further comprises a gear anchor mounted to its proximal end, the gear anchor comprising an aperture dimensioned to receive a distal end of the outermost drive screw and allow the nested, telescoping screws to extend into the reservoir when the outermost drive screw is rotated; and
wherein the gear anchor is disc-shaped and dimensioned to be press fit into the proximal end of the reservoir.