Patent ID: 9017289
Filing Date: 2015-04-28
Classification: A61M

Abstract:
1. A transdermal fluid delivery device positionable on a patient's epidermis for delivering fluid into the patient's bloodstream, comprising: a housing defining a longitudinal axis and having a proximal end and a distal end, the housing defining a passageway extending longitudinally therethrough and including a helical cam track disposed on an inner surface of the housing; a fluid reservoir positionable within the passageway of the housing, the fluid reservoir adapted for retaining a fluid therein; a base member positioned at the distal end of the housing; and a microneedle assembly coupled to the fluid reservoir, the microneedle assembly including a hub and a plurality of microneedles extending distally from the hub, the hub including at least one protrusion extending outwardly therefrom that is engaged within the helical cam track, each microneedle of the plurality of microneedles including a lumen defined therethrough in communication with the fluid reservoir, wherein rotation of the housing with respect to the microneedle assembly about the longitudinal axis of the housing in a first direction urges the at least one protrusion to move along the helical cam track, thereby translating the microneedle assembly longitudinally with respect to the housing from a retracted position, wherein the plurality of microneedles are disposed within the base member, to an extended position, wherein the plurality of microneedles are advanced distally to penetrate the base member and extend distally therefrom for puncturing the patient's epidermis and delivering the fluid into the patient's bloodstream, and wherein rotation of the housing with respect to the microneedle assembly about the longitudinal axis of the housing in a second, opposite direction urges the at least one protrusion to move along the helical cam track, thereby translating the microneedle assembly longitudinally with respect to the housing from the extended position to the retracted position.