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Noninvasive optical determination of partial pressure of carbon dioxide

A invasive, photoelectric detector technology, used in medical science, diagnostic recording/measurement, diagnosis, etc., can solve problems such as laser drift, changing light wavelength, etc., to achieve improved efficiency, short response time, and reliable use.

Inactive Publication Date: 2018-01-02
RADIOMETER BASEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although the laser is tuned to a specific wavelength, it can drift due to temperature changes, which has become a problem in sleep monitoring applications, where room temperature decreases at night, changing the wavelength of light in the detector system

Method used

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  • Noninvasive optical determination of partial pressure of carbon dioxide
  • Noninvasive optical determination of partial pressure of carbon dioxide
  • Noninvasive optical determination of partial pressure of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0073] refer to figure 1 with figure 2 The sensor (10) will be placed on the patient's skin (1) for measuring the partial pressure of blood gas in the skin. The membrane (13) is permeable to this gas, but prevents moisture, dust, etc. from entering the sensor core. Blood gas travels through two vent tubes (18) into the measurement chamber (23). The measurement chamber (23), the vent tube (18) and the skin define a closed system. Therefore, the amount of blood gas molecules in the measurement chamber (23) will timely reflect the partial pressure of blood gas in the patient's skin tissue. At one end of the measurement chamber (23), a light source (21) is provided so as to emit light into the measurement chamber (23). In the measurement chamber (23), the light at 4.26 μm is measured by the CO in the chamber (23) 2 The molecules absorb, resulting in attenuation of the light intensity at this wavelength, while the light at 3.9 μm is not absorbed and thus passes through the m...

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Abstract

Herein is disclosed a sensor for noninvasive measurement of the partial pressure of CO2 (pCO2) in the skin of a human. The sensor comprises a housing, a gas measuring chamber for measuring gases, at least one chimney for communication of gases diffusing through the skin to the gas measuring chamber, a broad band light source transmitting light into the gas measuring chamber and a detector system comprising a first and a second photodetector. The first photodetector detects light at a wavelength wherein CO2 absorbs light and the second photodetector acts as a zero reference detector by measuring light in a freeband where no gases absorb light.

Description

technical field [0001] Embodiments of the sensors and methods disclosed herein relate to the field of non-invasively measuring analyte concentrations in a subject, and in particular, to measuring carbon dioxide (CO 2 ) or partial pressures of other blood gases. Background technique [0002] Noninvasive measurement of blood gas partial pressure using sensors applied to the skin of humans or animals to measure blood gas partial pressure has been described in numerous publications as a useful tool in many clinical situations. For the non-invasive measurement of blood gases such as carbon dioxide (CO 2 ) and oxygen (O 2 )) sensors are an indispensable tool in the Intensive Care Unit (ICU) and Neonatal Intensive Care Unit (NICU) as they provide continuous and reliable monitoring of the respiratory function of the patient, human or animal in a non-invasive manner, And minimize workload for hospital staff. [0003] The trend in the field of skin / transcutaneous blood gas sensors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B5/1455
CPCA61B5/14551A61B5/6816A61B5/7214A61B5/14552A61B2560/0223
Inventor J.芬奇D.萨尔兹曼
Owner RADIOMETER BASEL
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