Fine needle aspiration syringe

Details Fine needle aspiration syringe Fine needle aspiration syringe

1992-01-30

1993-09-21

Rosenbaum, C. Fred

Surgery

Truss

Pad

128765, 604187, 604209, 604220, A61B 1000

Patent

active

052460118

ABSTRACT:
A control syringe is provided for fine needle aspiration of biopsy tissue. An aperture through the barrel of the syringe is temporarily covered with a flexible impervious pressure sensitive adhesive tape. A low pressure created in the barrel by withdrawing the plunger is broken by peeling the tape from the barrel. Thereafter, the tape may be replaced over the aperture so that collected tissue may be discharged by moving the plunger forward. A ratchet and pawl arrangement on the syringe holds the plunger in its rearward position until released. One ratchet and pawl comprises a plurality of ratchet teeth along at least one rib of an X-shaped cross section of the plunger and a pawl on the rearward end of the barrel for engaging the ratchet teeth. Such a ratchet is released by rotating the plunger.

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