Single use automated soft tissue aspiration biopsy device

A biopsy aspiration device comprising:

• a hollow cannula having a proximal end and a distal end;
• a stylet having a proximal end and a distal end and positioned within said cannula for axial movement relative thereto;
• a housing providing a sealed chamber and means for holding the operative components of the biopsy aspiration device;
• slide means movably associated with said housing in cooperative relationship with said sealed chamber, said slide means being movable from a cocked actuated position wherein the volume of said sealed chamber is minimized, to a released at rest position wherein the volume of said sealed chamber is maximized, with said movement of said slide means from said actuated position to said released at rest position resulting in a displacement between said cannula and said stylet;
• biasing means engageable with said slide means when said slide means is in said cocked position to urge said slide means to said at rest position;
• cocking and releasing means associated with said slide means and said housing for moving said slide means against force of said biasing means to the cocked actuated position and for releasing said slide means to be moved to said released at rest position by said biasing means;
• said hollow cannula being communicated with said sealed chamber, and one of said stylet or said cannula having its proximal end fixedly anchored to said slide means and the other one of said stylet or said cannula having its proximal end anchored to said housing;
• whereby upon release of said slide means the resultant volume increase in said sealed chamber creates a pressure reduction, and the pressure reduction generated within said chamber is translated to the distal end of said cannula to effect aspiration of a biopsy specimen into the cannula during actuation of the device;
• and
• displacement selector means for selecting the amount of displacement between said cannula and said stylet.