Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1996-12-03
1998-07-21
Rosenberger, Richard A.
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
600330, A61B 500
Patent
active
057841519
ABSTRACT:
The invention relates to apparatus for testing a pulsed light oximeter, such as a non-invasive oximeter which emits pulses of red and infrared light. A light sensor produces an electrical pulse signal representative of light flashes emitted by the oximeter, and a signal generator produces a plurality of absorbance signals representative of the optical absorbance of an anatomical part at the wavelength of each light flash. A signal selector responds to time interval, duration and amplitude features of the electrical pulse signal, or to electrical signals produced by the oximeter itself, and thereby selects one of the plurality of absorbance signals to produce a selected absorbance signal. The selected absorbance signal is converted to light and conveyed to the oximeter to simulate the effect of the anatomical part on the light flashes emitted by the oximeter. The selector additionally produces an alarm signal if features of the electrical pulse signal do not match predefined reference features derived from a priori knowledge of the oximeter. The invention also includes a novel probe for use in testing an oximeter with a transilluminating sensor, the probe incorporating two prisms with each prism having one end in the shape of an acute wedge to achieve a low profile. The wedges of both prisms have roughened surfaces to scatter light so that the probe advantageously obtains a low position sensitivity. The invention may also be incorporated into the oximeter itself, advantageously providing the oximeter with self-diagnostic capability.
REFERENCES:
patent: 4796633 (1989-01-01), Zwirkoski
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patent: 5166517 (1992-11-01), Volgyesi
patent: 5348005 (1994-09-01), Merrick et al.
K. Tremper & S. Barker, "Pulse Oximetry", Anesthesiology, vol. 70; pp. 98-108, 1989.
Evans Ronald William
Miller Mark Edward
Datrend Systems Inc.
Rosenberger Richard A.
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