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Fluid-filled
products may consist of small or large chambers filled with air, water or other viscous
fluid materials such as silicon elastomer or silicon or polyvinyl. The fluid flow from
chamber to chamber or within a single chamber is passive in response to movement and
requires no supplemental power. The term "air-flotation" is sometime used to
describe interconnected multi-chamber surfaces such as those manufactured by ROHO, Inc.
For air cushions, care must be taken to maintain the correct levels of inflation in order
to achieve optimal pressure reduction. Under-inflation causes bottoming-out and
over-inflation increases the interface pressure. For viscous fluid-filled seating surfaces
like the Jay2 seat cushion (Sunrise Medical, Inc.) it is important to monitor the
distribution of viscous material and manually move it back to the areas under bony
prominences if it has moved away from these areas. |