Apparatus for preventing over inflation of the retention balloon in medical catheters and airway devices
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United States of America Patent
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Apr 18, 2017
Grant Date -
Feb 19, 2015
app pub date -
Jul 25, 2014
filing date -
Nov 16, 2011
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Abstract
The body has a fluid inlet port for receiving pressurized fluid and a fluid outlet port connected to the retention balloon. A first passage connects the fluid inlet port and the fluid outlet port. A second passage in the body is connected to the balloon fluid return path and is at the pressure of the retention balloon. A valve prevents fluid flow through the first passage when actuated. The valve includes a pressure-responsive member movable to a position to obstruct fluid flow in response to fluid pressure in the second passage exceeding the predetermined level. Flexible means such as a membrane defines a normally open portion of the first fluid passage, which is closed by the moveable means bearing on the membrane when pressure exceeding the predetermined level actuates the valve.
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