Pulse oximeter with physical motion sensor
First Claim
1. A pulse oximeter of the reflection type, comprising:
- first sensor means including means for emitting two lights having different wavelengths toward a body portion of said subject, and means for detecting the lights reflected from said body portion, said first sensor means producing first signals each of which is representative of a corresponding one of the detected lights;
second sensor means for detecting a physical motion of said subject, said second sensor means producing a second signal representative of the detected physical motion;
support means for supporting said first and second sensor means;
set means for setting said support means supporting said first and second sensor means, on said body portion of said subject; and
control means for discriminating the first signals produced by said first sensor means when said second signal is produced by said second sensor means, from the first signals produced when said second signal is not produced.
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Accused Products
Abstract
A reflectance pulse oximeter for detecting pulse synchronous waves is disclosed. The detector includes a sensor or sensors for detecting physical motion of the subject so that readings influenced by subject movement can be eliminated or indicated. One form of motion detector used is an accelerometer employing a spring-supported weight mounted within a cylinder. Accelerations beyond a predetermined value cause the weighted member to complete a circuit against the inside walls of the cylinder. Three accelerometers for detecting acceleration in each of three directions can be utilized. Motion can also be detected by a cubic motion detector having individual reed valves associated with each of six faces. A magnetic ball is movable in a spherical space formed within the cubic body. The magnetic ball operates to actuate only one of the reeds which is at a time. Motion detection can also be accomplished by a combination of the cubic motion detector and one or more accelerometers of the type previously described. A microprocessor control system determines the presence of a pulse synchronous wave from the reflectance detector system and can suppress indication of a pulse synchronous wave occurring simultaneously with motion detection by the motion detecting sensors, which motion is detected for greater than a predetermined period of time. The control system also can include provision for the display of an indication that the displayed pulse synchronous wave occurred during movement of the subject.
580 Citations
7 Claims
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1. A pulse oximeter of the reflection type, comprising:
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first sensor means including means for emitting two lights having different wavelengths toward a body portion of said subject, and means for detecting the lights reflected from said body portion, said first sensor means producing first signals each of which is representative of a corresponding one of the detected lights; second sensor means for detecting a physical motion of said subject, said second sensor means producing a second signal representative of the detected physical motion; support means for supporting said first and second sensor means; set means for setting said support means supporting said first and second sensor means, on said body portion of said subject; and control means for discriminating the first signals produced by said first sensor means when said second signal is produced by said second sensor means, from the first signals produced when said second signal is not produced. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification