A medical instrument having an aspiration and/or injection needle and handle device. The handle device provides audible and/or tactile feedback during the application of activation forces, thus enabling the user to determine where the distal end of the aspiration and/or injection needle is relative to a sheath. More than two grooves are present on a shaft of an activation handle of the handle device. An O-ring resides within a handle portion of the handle device. The O-ring seats and unseats within the grooves based on the amount of applied force.