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Aspiration needle apparatus incorporating its own vacuum and method and adapter for use therewith

  • US 5,701,910 A
  • Filed: 08/19/1996
  • Issued: 12/30/1997
  • Est. Priority Date: 04/13/1995
  • Status: Expired due to Fees
First Claim
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1. An aspiration needle apparatus for collecting cell samples by withdrawing aspirate from tissue in a living body comprising an aspiration needle having proximal and distal extremities and having a flow passage extending from the proximal extremity to the distal extremity, the proximal extremity having a hub formed thereon, said hub having a cell collection chamber therein in communication with the flow passage in the aspiration needle, a vacuum container having an enclosed evacuated space evacuated to a subambient pressure which provides a predetermined volume of evacuated space devoid of a solid or a liquid and devoted solely to providing the desired vacuum and sealed by a penetrable diaphragm providing access to the evacuated space, an adapter mounted on the hub and making a fluid-tight connection therewith, said adapter being formed to receive said vacuum container and receiving said vacuum container, said adapter including needle means carried thereby having a flow passage therein in communication with the flow passage in the aspiration needle, yieldable means carried by the adapter, said adapter and said vacuum container being formed so as to permit relative movement between the adapter and the vacuum container against the force of the yieldable means to cause the needle means to puncture the diaphragm of the vacuum container to connect the evacuated space having a subambient pressure in the vacuum container to the aspiration needle to supply the subambient pressure to the aspiration needle to cause aspirate from the tissue to be drawn into the cell collection chamber.

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