A needle for fine-needle aspiration includes an elongated body extending from a proximal end to a distal end along a central longitudinal axis and having a channel extending therethrough, a distal portion of the body being movable between a first configuration in which the distal portion extends parallel to the central longitudinal axis and the channel is unobstructed and a second configuration in which the distal portion is axially offset relative to the central longitudinal axis to seal at least a portion of the channel and an actuation mechanism controlling movement of the distal portion between the first and second configurations.
