Apparatus for measuring the oxygen saturation of fetuses during childbirth
First Claim
1. Apparatus for measuring the oxygen saturation of fetuses during childbirth comprising:
- a probe for attachment to a fetal scalp and being held in position by a partial vacuum, said probe having at least two photodiodes operating at different wavelengths and a photodetector forming parts of an optical reflection measurement portion for determining oxygen saturation in the arterial or pulsating bloodstream of fetuses, oxygen saturation being proportional to the ratio of oxyhemoglobin to the sum of oxyhemoglobin and desoxyhemoglobin, said probe providing output signals to an evaluating pulsoxymeter, wherein said optical reflection measurement portion is arranged on a distal emergence planar surface of said probe which itself is not subjected to a partial vacuum.
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Accused Products
Abstract
An apparatus for measuring the oxygen saturation of fetuses during childbirth, using a probe, assigned to the fetal scalp, with two or four photodiodes operating at different wave lengths and a photodetector disposed in the plane of the photodiodes as parts of an optical reflection measurement portion for determining the oxygen saturation in the arterial or pulsating bloodstream, which is proportional to the ratio of oxyhemoglobin to the sum of oxyhemoglobin and desoxyhemoglobin by reflection measurement in an area, which is not subjected to a partial vacuum. Output signals of the apparatus are supplied to an evaluating pulsoxymeter over a cable connection having a plug-and-socket connector.
184 Citations
11 Claims
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1. Apparatus for measuring the oxygen saturation of fetuses during childbirth comprising:
a probe for attachment to a fetal scalp and being held in position by a partial vacuum, said probe having at least two photodiodes operating at different wavelengths and a photodetector forming parts of an optical reflection measurement portion for determining oxygen saturation in the arterial or pulsating bloodstream of fetuses, oxygen saturation being proportional to the ratio of oxyhemoglobin to the sum of oxyhemoglobin and desoxyhemoglobin, said probe providing output signals to an evaluating pulsoxymeter, wherein said optical reflection measurement portion is arranged on a distal emergence planar surface of said probe which itself is not subjected to a partial vacuum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification