Method and apparatus for noninvasive physiologic monitoring

• US 7,181,264 B2
• Filed: 03/12/2003
• Issued: 02/20/2007
• Est. Priority Date: 03/12/2002
• Status: Expired due to Fees

• Current Assignee: Sekos, Inc.
• Original Assignee: Sekos, Inc.
• Inventors: Wiesmann, William P., Pranger, Loland A., Bogucki, Mary S.
• Primary Examiner(s): Casler; Brian L.
• Assistant Examiner(s): Lamprecht; Joel M.
• Application Number:
  US10/387,138
• Publication Number:
  US 20030212315A1
• Time in Patent Office: 1,441 Days
• Field of Search: 600/472, 600/476, 600/473, 600/322, 600/474, 600/323, 128/204.23, 128/201, 340/573, 455/100, 455/66
• US Class Current: 600/473
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6814 Head

Abstract

Intense environmental or working conditions can impede an individual'"'"'s evaporative cooling mechanism normally responsible for thermoregulation during exercise or exertion. Non-invasive physiological monitoring capabilities are needed to more precisely define the cardiovascular responses and identify markers of impending failure of compensatory mechanisms prior to collapse or onset of irreversible pathology. The oxymetry method and system of the present invention provides non-invasive, continuous remote monitoring and analysis of cardiovascular and pulmonary function that overcomes accuracy and monitoring deficiencies of current oximetry systems.

Claims

1. A method of using a SCBA mask having emitter and detector sensors for obtaining non-invasive pulsatile physiologic parameters and non-pulsatile physiological parameters comprising the steps of:

(a) determining optimal distance between said emitters and said detectors;

(b) placing and securing said mask on an individual'"'"'s face and reducing incidences of motion artifact and orienting said emitter and detector sensors perpendicular to said individual'"'"'s forehead;

(c) supplying a light array from said emitter to said individual'"'"'s forehead and capillary bed and bounding said array off said individual'"'"'s bone'"'"'

(d) detecting and transmitting said light to a remote processor;

(e) obtaining said physiologic parameters pertaining to said pulsatile parameters and said non-pulsatile parameters;

(f) correlating said physiologic parameters to optimal monitoring and accuracy of individuals using said SCBA mask in extreme conditions;

(g) using direct current signals and obtaining constant and variable non-pulsatile readings;

(h) analyzing said non-pulsatile readings and obtaining said non-pulsatile physiologic parameters;

(i) using alternating current signals and obtaining pulsatile readings; and

(j) analyzing said pulsatile readings and obtaining said pulsatile physiologic parameters.

2. A method for obtaining physiological parameters as recited in claim 1, wherein said non-pulsatile physiological parameters comprise mixed venous oxygen saturation, cardiac output, tissue perfusion and tissue oxygen demand, and wherein said constant non-pulsatile readings comprise skin pigmentation, restrictive tensions on vascular beds and tensions caused by sensor placement;

and

wherein said variable non-pulsatile readings comprise oxygenation saturation of hemoglobin in tissue beds, non-pulsating arterial blood and venous blood.