US 2022/0054739 A1 · DOUBLE-ACTING, TELESCOPING SCREW-DRIVEN PUMP MECHANISM DISPOSED EXTERNALLY TO RESERVOIR IN FLUID DELIVERY DEVICE

Abstract

A fluid delivery device has a syringe barrel-type reservoir with plunger, and plunger driver assembly comprising double-acting, telescoping lead screws that is located behind and outside of the barrel. Simultaneously and counter-rotating sleeve screw and center screw telescope out of a nested configuration of the plunger driver assembly and into the reservoir at a rate of double their individual and equal pitch and lead parameters when the sleeve screw is rotated. A threaded nut and gear anchor disposed on an end of the barrel receive the sleeve screw and the threaded nut causes the sleeve screw to translate and rotate in response to motor operation. A distal end of the center screw can be keyed to a plunger pusher for anti-rotation constraint when the motor is imparting rotation on the threaded nut and sleeve screw.

Claims23

Dependent claims

A fluid delivery device comprising:

a 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 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.

Dependencies are inferred from the claim text.

Facts

Application

17/401,871Filed 13 Aug 2021

Priority

18 Aug 2020

Published

24 Feb 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61M 5/1452
Using pressurised reservoirs, e.g. by means of pistons: pressurised by means of pistons
A61M 5/14216
Pumping with an aspiration and an expulsion action: reciprocating piston type
A61M 5/14236
Pumping with an aspiration and an expulsion action: screw, impeller or centrifugal type pumps
A61M 5/14248
Adapted to be carried by the patient, e.g. portable on the body: of the skin patch type

Double-acting, telescoping screw-driven pump mechanism disposed externally to reservoir in fluid delivery device

Life of this patent

Double-acting, telescoping screw-driven pump mechanism disposed externally to reservoir in fluid delivery device

Life of this patent

Abstract

Claims23