Surgery – Truss – Pad
Patent
1988-05-04
1990-08-07
Green, Randall L.
Surgery
Truss
Pad
12820213, 12820222, 12820523, 128671, A61B 508
Patent
active
049459180
ABSTRACT:
A method and apparatus for monitoring a patient's circulatory status during cardiopulmonary resuscitation is disclosed. The apparatus includes a housing defining a passageway through which the patient's breath passes. The device also includes a carbon dioxide indicator in communication with said passageway for indicating the presence of carbon dioxide in the patient's breath over a temporary period of time wherein the length of the temporary period is a known function of the level of carbon dioxide in the patient's breath. Accordingly, the level or concentration of carbon dioxide in the patient's breath is easily determined by simply measuring the length of the temporary period. The preferred carbon dioxide indicator utilizes a chemical substance that changes color when exposed to carbon dioxide. The chemical substance is preferably disposed in an internal chamber which is in communication with the housing's passageway. The internal chamber is preferably sized and configured to contain a predetermined amount of the chemical substance so that all of the substance changes color over a period of about four minutes when exposed to the breath of a patient containing about 1% carbon dioxide.
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MSA Company Brochure: "Vaporgard", Pittsburgh, Pa.
M. G. Lepilin, M.D. et al.; "End-Tidal Carbon Dioxide as a Noninvasive Monitor of Circulatory Status During Cardiopulmonary Resuscitation; A Preliminary Clinical Study", vol. 15, No. 10, 1987.
S. Dohi, M.D. et al.: "Carbon Dioxide Elimination During Circulatory Arrest".
A. R. Garnett, M.D. et al.: "End-Tidal Dioxide Monitoring During Cardiopulmonary Resuscitation", vol. 257, No. 4, Jan. 23/30, 1987.
Green Randall L.
Reichle K. M.
Smith Brian D.
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