Apparatus for measuring a variation in a circumference of a body part and method for plethysmography
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United States of America Patent
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Jul 15, 2003
Grant Date -
Jun 27, 2002
app pub date -
Feb 28, 2002
filing date -
Aug 9, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for measuring a variation in a circumference of a body part comprising an elongated force transmission element, an elongated support element, a casing, and a displacement measuring device, said force transmission element having a first end and a second end and not being expandable longitudinally, said support element having a first end and a second end and being expandable longitudinally, said force transmission element being slidingly arranged on said support element, said displacement measuring device having force connecting means being connectable or connected to said first end of said force transmission element and being moveable relative to said casing, and comprising support connecting means being connectable or connected to said first end and to said second end of said support element, and further comprising fixing means being connectable or connected to said second end of said force transmission element and being fixed relative to said casing, said displacement measuring device having measurement means for measuring a relative movement between said force connecting means and said casing.
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