Patent ID: 7226423
Filing Date: 2007-06-05
Classification: A61B

Abstract:
1. An aspirating needle for collecting a specimen comprising: an elongated hollow body that includes a distal tip that is constructed to puncture cortical bone and a first lumen portion and a second lumen portion, the first lumen portion being open at both ends for placement at a specimen site to collect and permit aspiration of the specimen from the specimen site, the second lumen having first and second vent ports, with the second vent port being formed along the elongated body such that when the needle is placed at the specimen site, the second vent port is positioned at the specimen site, the first vent port being in fluid communication with atmospheric air when the needle is positioned at the specimen site so as to permit pressure within the specimen site to equilibrate with atmospheric pressure by means of the venting action of the second lumen portion, wherein the first and second vent ports are formed along axes that are perpendicular to a longitudinal axis that extends along the length of a main vent channel that connects the first and second vent ports to one another, and wherein only the opening of the first lumen portion is located at the distal tip, with the second vent port being offset therefrom, the first and second lumen portions being formed in a non-concentric arrangement and a cross-sectional area of the first lumen portion being greater than a cross-sectional area of the second lumen portion, the first lumen portion being linear along its length, the needle having a filter disposed within the second lumen to remove any physical or bacterial material that is drawn into the second lumen portion during an aspiration procedure.