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Biopsy needle system having a pressure generating unit

  • US 8,162,851 B2
  • Filed: 10/05/2010
  • Issued: 04/24/2012
  • Est. Priority Date: 03/29/2003
  • Status: Active Grant
First Claim
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1. A biopsy needle system, comprising:

  • a cylinder with an open end and a cylinder wall;

    a piston 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 connected to the cylinder; and

    a ventilation groove established in the cylinder wall only to a depth of a portion of a thickness of the cylinder wall, the ventilation groove being 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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