Differential pressure device for accelerated catheter flashback
First Claim
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1. In a vascular fluid withdrawal or introduction device the improvement comprising, apparatus for confirming placement through creation of flashback, including:
- an elastomeric housing defining a chamber, adapted to communicate with said device at one end; and
at least a pair of oppositely facing compression arm means embracing said housing, said means being hingedly coupled at said one end, said arm means having at least two compression fulcra intermediate its ends,whereby compression together of said arms causes said fulcra successively to compress said chamber closed from said one end to the other, preceding fulcra being disengaged as successive fulcra are engaged.
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Abstract
A pair of compressible, hinged opposing arms enclose a bladder chamber, which in turn is coupled to the catheter. As the arms are compressed together, successive pivot fulcra close, in turn first pinching and closing, and then opening the bladder to create negative differential pressure against the catheter, and promoting flashback.
15 Citations
5 Claims
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1. In a vascular fluid withdrawal or introduction device the improvement comprising, apparatus for confirming placement through creation of flashback, including:
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an elastomeric housing defining a chamber, adapted to communicate with said device at one end; and at least a pair of oppositely facing compression arm means embracing said housing, said means being hingedly coupled at said one end, said arm means having at least two compression fulcra intermediate its ends, whereby compression together of said arms causes said fulcra successively to compress said chamber closed from said one end to the other, preceding fulcra being disengaged as successive fulcra are engaged. - View Dependent Claims (2, 3, 4, 5)
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Specification