Patent ID: 9072507
Filing Date: 2015-07-07
Classification: A61B

Abstract:
1. A suction puncture device comprising: a tubular body having a distal edge defining a puncture needle, the distal edge further defining an opening at a distal end of the tubular body; a stopper member capable of advancing and retracting in a longitudinal direction within an interior of the tubular body to vary a distance between a distal end of the stopper member and the distal end of the tubular body, a ventilation passage being formed between an exterior surface of the stopper member and an interior surface of the tubular body; and a seal disposed in the tubular body and configured to seal the ventilation passage at a proximal end of the tubular body for less than a full movement range of the stopper member in the longitudinal direction; wherein a variable volume sample containing portion is formed within the interior of the tubular body between the distal end of the stopper member and the distal end of the tubular body wherein the seal comprises: the stopper member having a larger-diameter portion disposed within the tubular body and movable with the stopper member, a dimension of the larger-diameter portion being enlarged at a portion of the stopper member in a longitudinal direction; and an elastic body arranged in the tubular body so as to allow the stopper member to advance and retract through a hole included in the annular elastic body; wherein when the stopper member is retracted in a proximal direction by a predetermined distance, the larger-diameter portion locates within at least a portion of the hole of the elastic body to seal the ventilation passage.