Optical method and apparatus for measuring carbon monoxide in non-hemolyzed blood
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United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
May 7, 1998
filing date -
May 7, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Carbon Monoxide (CO) is a colorless, tasteless, and odorless gas which causes asphyxiation by combining with a strong affinity to blood hemoglobin. Unless a patient is quickly identified as having CO poisoning, the patient could face severe medical consequences including death. This patent describes a reagentless optical method for measuring carboxyhemoglobin (HbCO) in a whole undiluted blood sample that can be obtained from a fingerstick. A battery-operated triple wavelength device measures light transmission at frequencies of 548 nm, 810 nm and 950 nm through a 40 .mu.L sample of undiluted whole blood placed in standard disposable glass capillary tube. Having a portable point-of-care device, for uses by paramedics during an emergency situation, in the emergency room, or in a physician's office, can provide accurate immediate confirmation of CO poisoning.
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