Integrating sphere model for calibrating tissue oxygen indexes

Abstract

The invention discloses an integrating sphere model for calibrating tissue oxygen indexes. The integrating sphere model comprises a hemispherical integrating sphere, a base, a color filter and a barrier. The hemispherical integrating sphere is supported by the base, the color filter is convenient to replace, the barrier covers the upper side of the hemispherical integrating sphere, a light hole of a light source and three light holes of receivers are formed in the barrier and are arrayed to form a straight line, the color filter comprises a group of light-transmittance films which have unequal absorptive actions on photons at wavelengths of 760nm and 840nm and nonlinear absorption lines near the wavelengths of 760nm and 840nm, and the color filter is selectively placed on one light hole of the receiver. The integrating sphere model has the advantages that the stable optical integrating sphere model is used as a calibrating medium of a blood oxygen instrument instead of a blood model and is stable and reliable in performance; the color filter is used during calibration, so that the integrating sphere model can have different attenuation actions on the photons at the different wavelengths, tissue oxygen index values measured by the blood oxygen instrument can be calibrated in a multi-point manner, and a calibration effect can be improved.

Description

technical field [0001] The invention relates to a medical simulation device, in particular to an integrating sphere model used for tissue oxygen saturation calibration. Background technique [0002] Tissue oxygen saturation (Tissue Oxygen Index, hereinafter referred to as TOI) is used to reflect the total oxygen saturation of all blood in the measured tissue, which is the weighted average of arterial oxygen saturation and venous oxygen saturation in the measured tissue. [0003] Near Infrared Spectroscopy (NIRS) is a physiological parameter detection technology that has gradually emerged in the past 20 years, and its core detection index is tissue oxygen saturation. The near-infrared tissue blood oxygen parameter non-destructive monitor (hereinafter referred to as the oximeter) is based on NIRS technology, which injects light of three different wavelengths into the tissue under test, and obtains the absorption of light by the tissue by measuring the intensity of the outgoing...

AI Technical Summary

Problems solved by technology

[0007] 1. The core component of the blood model is human blood, which is unstable in nature and cannot be stored for a long time. It must be prepared on-site before the calibration test

However, the indicators of the human blood required for each deployment are difficult to keep consistent

Therefore, the blood model calibration method has the disadvantages of inconvenient operation and unstable performance.

[0008] 2. The blood model calibration method requires an accurate blood gas analyzer, which is expensive and requires consumables

Therefore, this calibration method has the problem of high cost

[0009] 3. It takes a long time to adjust the blood oxygen saturation in the blood model, so this calibration method has the problem of too long operation time

[0011] 1. The device can only simulate the absorption of light by human tissue with an oxygen saturation of 62%, that is, it can only perform single-point calibration on the TOI measured by the oximeter at 62%.

[0012] 2. The device cannot reflect the impact of the fluctuation of the photoelectric device parameters of the oximeter on the measurement results

This means that when using it to calibrate an oximeter with abnormal photoelectric device parameters, the result is still normal (62%), which greatly affects the calibration effect of the device

Images