Sensor, apparatus and method for non-invasive measurement of oxygen saturation
Patent 5285784 Issued on February 15, 1994. Estimated Expiration Date: 
October 13, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 13, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDiabetes detection method Diabetes detection method Patent #: 5025785 InventorApplicationNo. 960923 filed on 10/13/1992US Classes:600/331, Calibrated356/41, Oximeters600/323, Oxygen saturation, e.g., oximeter600/475With comparison means (e.g., ratio of or comparison to a standard)ExaminersPrimary: Howell, Kyle L.Assistant: Nasser, Robert L. Attorney, Agent or FirmInternational ClassA61B 005/00Foreign Application Priority Data1990-02-15 EPAbstractA sensor for non-invasive measurement of oxygen saturation using the reflection method comprises a red transmitter (55), an infrared transmitter (58) and a receiver (57). The distances between the transmitters and the receiver are selected such that the length of the light path (60, 61) between the red transmitter (55) and the receiver (57) is substantially equal to the length of the light path (62, 63) between the infrared transmitter (58) and the receiver (57). The sensor comprises a further red transmitter (56) which is used for another application at the human body or another tissue characteristics where the depth of penetration at the various wavelengths is different from the shown example. Together with an appropriate oximeter, manual or automatic adaptation is possible. Further signal improvement may be obtained by autocorrelating the received signal, detecting its frequency and cross-correlating it with a pattern function of the same frequency.Field of SearchOximeters | |
