A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
354/22
A61B 5/00 (2006.01)
Patent
CA 1304503
METHOD AND APPARATUS FOR INDICATING PERFUSION AND OXYGEN SATURATION TRENDS IN OXIMETRY Abstract of the Invention The present invention discloses a method and apparatus for indicating perfusion and oxygen saturation treands in oximetry. In transmittanceand reflectance oximetry, LEDs (40, 42) are typically employed to expose tissue to light at two different wavelengths. The light transmitted through, or reflected by, the tissue is received by a detector (38) where signals proportional to the intensity of light are produced. These signals are then processed by oximeter circuitry (14, 16) to determine oxygen saturation, pulse rate, and per usiom Displays (20) are provided including a display (132, 134) of the change in the oxygen saturation during a specified interval. This display may include first (132) and second (134) trend indication displays that indicate when the oxygen saturation has either been increasing or decreasing at a rate in excess of some predetermined level. Preferably, these displays are triangular, upwardly and downwardly directed light-emitting diodes. A digital display (138) of the changein oxygen saturation may also be provided. A second type of display included provldes pulse and perfusion information, with the perfusion being displayed as a logarithmic function of the actual perfusion. This display comprises an aligned array of light-emitting diodes (136) with the number of light-emitting diodes lit at any one tlme being logarithmically proportional to the magnitude of the perfus{on. The display is automatically scaled to produce a full-scale display when the peak perfusion exceeds some predetermined level.
544658
Craig Kenneth C. Jr.
Gauglitz Karl F.
Losh G. Michael
Mason Lee R.
Nova Richard C.
Craig Kenneth C. Jr.
Gauglitz Karl F.
Losh G. Michael
Mason Lee R.
Nova Richard C.
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