Subcutaneous radiation reflection probe
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United States of America Patent
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Jun 15, 1999
Issued Date -
N/A
app pub date -
Jun 24, 1997
filing date -
Feb 17, 1993
priority date (Note) -
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Abstract
A subcutaneous radiation reflection probe for measuring oxygen saturation in living tissue includes an elongate drive shaft on one end of which is detachably coupled a mounting cup. The mounting cup includes a hollow for receiving and holding a base element on which is mounted a spiral needle which coils outwardly from the mounting cup to terminate in a pointed end. A window is formed in the spiral needle near the pointed end thereof for receiving and holding a radiation emitter, such as a light emitting diode. A radiation detector is disposed on the base element within the coil of the spiral needle. The probe may be used to measure oxygen saturation in living tissue, such as a fetal scalp, by inserting the mounting cup and drive shaft through an introducer into a woman's vagina until the spiral needle contacts the fetal scalp. The drive shaft may then be rotated so that the spiral needle rotates into the scalp, after which energizing pulses are applied to the radiation emitter to cause it to emit radiation and illuminate the fetal scalp tissue into which the needle is inserted. The radiation detector detects a portion of this radiation, depending upon the oxygen saturation of the tissue, and develops a signal to thus provide a measure of the oxygen saturation.
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