Device for at least one of injection or aspiration

摘要

Micro-volume devices, systems, and associated methods that facilitate the injection or aspiration of precisely controlled volumes of materials at precisely controlled rates are provided. In one embodiment, a micro-volume device includes a syringe and a lead screw connected to a plunger of the syringe. A mechanical interface is connected to the lead screw and includes a first set of cams adjacent a proximal portion and a second set of cams adjacent a distal portion. A mechanism is configured to oscillate a structure in a direction parallel to a longitudinal axis of the lead screw such that one or more projections of the structure to alternatively engage cams of the first and second sets of cams in a manner that results in rotation of the mechanical interface in a single direction for highly controlled linear displacement of the plunger.

主权项

1. An apparatus comprising:
a body defining a cavity for receiving a fluid, the body having a first opening providing communication between with the cavity and an exterior of the body; a structure movable within the cavity, the structure adapted to be displaced within the cavity to displace an amount of the material within the cavity; a lead screw comprising:
a first portion coupled to the structure; anda longitudinal axis; a cam device coupled to the lead screw, the cam device comprising a plurality of cams; at least one engaging member adapted to engage the plurality of cams; an actuator coupled to the at least one engaging member, the actuator operable to oscillate the at least one engaging member to alternately engage the plurality of cams so as to rotate the cam device in a single direction; and an advancement component moveable between a first position in which the advancement component engages the lead screw and a second position in which the advancement component is disengaged from the lead screw, the advancement component comprising a first engaging feature, wherein the lead screw comprises a second engaging feature, and wherein the first engaging feature and the second engaging feature matingly engage to cause the lead screw to translate longitudinally along the longitudinal axis when the lead screw is rotated.