Biopsy needle system having a pressure generating unit
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United States of America Patent
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Apr 24, 2012
Grant Date -
Jan 27, 2011
app pub date -
Oct 5, 2010
filing date -
Mar 29, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A biopsy needle system includes a cylinder with an open end and a cylinder wall. A piston is inserted in the open end such that a cylinder interior volume is defined between the piston and the cylinder, the piston being movable in the cylinder. A biopsy needle is connected to the cylinder. A ventilation groove is established in the cylinder wall only to a depth of a portion of a thickness of the cylinder wall. The ventilation groove is positioned such that the cylinder interior volume of the cylinder communicates with the ambient atmosphere when the piston is displaced to a position in the cylinder so as to establish an airflow through the ventilation groove past the piston.
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