Perinatal pulse oximetry sensor
Patent 4938218 Issued on July 3, 1990. Estimated Expiration Date: 
October 28, 2008. 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 28, 2008. 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 References 3167658 3599629 3602213 3647299 3659586 3704706 3769974 3841314 3858574 Photoelectric pulsemeter InventorsAssigneeApplicationNo. 264196 filed on 10/28/1988US Classes:600/338, Fetal tissue600/476Visible light radiationExaminersPrimary: Jaworski, Francis J.Assistant: Hanley, John C. Attorney, Agent or FirmForeign Patent References
International ClassA61B 005/00AbstractAn apparatus for use in measuring fetal blood flow characteristics. The apparatus includes a non-invasive pulse oximetry probe that is inserted into the uterus between the fetus and the uterine wall. The probe is deformable and is positively attached to the fetal tissue surface using a vacuum pump which causes the probe to deform from a pre-set curvature to the curvature of the fetal tissue surface and to form a gasket-type seal with the fetal tissue surface. The probe is manually inserted into the uterus using a curved insertion tool, and is shaped to fit through a slightly dilated cervix. In a preferred embodiment, the probe includes fetal and maternal ECG sensors and additional sensing devices, and is provided with apparatus for improving the efficiency of the pulse oximetry optics.Other References
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