Method and apparatus for cardiovascular diagnosis
Patent 5542421 Issued on August 6, 1996. Estimated Expiration Date: 
August 30, 2014. 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.
August 30, 2014. 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 H1039 Re33834 3461865 3575162 3602213 3704706 3910701 Photoelectric physiological measuring apparatus Instrumentation for monitoring blood circulation Method for determining bilirubin concentration from skin reflectance InventorAssigneeApplicationNo. 297899 filed on 08/30/1994US Classes:600/477, With comparison means (e.g., ratio of or comparison to a standard)600/310, Infrared, visible light, or ultraviolet radiation directed on or through body or constituent released therefrom600/504Measuring blood flow in body portion other than heartExaminersPrimary: Sykes, Angela D.Assistant: Nasser, Robert L. Attorney, Agent or FirmInternational ClassA61B 005/00AbstractA non-invasive method and apparatus for sensing relative blood conditions in extremities, such as using photoelectric dermachromography to measure differential blood flow and/or pooling between extremities, for the purpose of diagnosing cardiovascular conditions. Reflective colorimeters are employed for performing comparative light reflection rheology (LRR). The resting, steady-state LRR for both the left and right palms are simultaneously measured when both arms are in a raised, steady-state condition, and again when both arms are in a lowered, steady-state condition, thereby providing a repeatable measurement of overall vasomotor tone, the tone of the smooth muscles of the arterial walls. Two portable light gauges are used, each including a plurality of light sources such as light-emitting diodes (LEDs) arranged around at least one light detector. Each gauge is removably attachable to the palms of the hands of the patient whose vasomotor tone is to be determined. The gauges are removably attached to the palms so that the hands are movable, and measurements are taken of both hands in a raised, substantially steady-state UP condition, and then again while both hands are in a lowered, substantially steady-state DOWN condition. After a series of these UP and DOWN measurements are taken, the gauges are switched and another series of UP and DOWN measurements with the gauges reversed are taken. Each gauge is independently calibrated by using standardized reference scales.Other References
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