Angiographic control syringe
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United States of America Patent
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-
Jan 31, 1995
Grant Date -
N/A
app pub date -
Sep 3, 1993
filing date -
Sep 3, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved angiographic control syringe for use in high-pressure medical procedures. An oblong locking ring disposed on a plunger stem. The oblong locking ring has two circular end segments at the far opposing ends of the ring, and comprises two flat segments at the narrow diameter opposing sides of the ring. A plurality of grooves are vertically spaced on the upper part of the plunger stem. Notches extend inwardly from the flat segments of the locking ring. The exertion of a pinching force on the circular end segments of the locking ring causes convex radial expansion of the flat segments, thereby permitting detachable engagement of the notches with any groove. The plunger head has a highly angular frustoconical head. The syringe barrel has a less angular frustoconical seat that receives the plunger head when the plunger head is fully depressed within the syringe barrel. Due to the difference between the angle of the plunger head and the angle of the seat, a circular air bubble retention cell is formed between the outer wall of the plunger head and the outer wall of the syringe barrel seat when the plunger is fully depressed.
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