A reflective photoelectric sensor for gingival blood flow monitoring and its preparation method

Abstract

The invention discloses a reflective photoelectric sensor for monitoring blood flow of gums and a method for manufacturing the reflective photoelectric sensor. The reflective photoelectric sensor and the method have the advantages that the layout of light-emitting diodes and photoelectric receiving chips are changed, so that photoelectric receiving areas can be enlarged, and the performance of signals which are acquired reflectively can be improved in the aspects of measurement precision, interference resistance, stability and the like; silicon dioxide and silicon nitride are smeared, so that injury to users due to electric leakage of the sensor can be prevented; the reflective photoelectric sensor is provided with annular electrodes, so that extraction positions of the corresponding positive electrodes and extraction positions of the corresponding negative electrodes can be selected according to extraction positions of electrodes of printed circuit boards, and the problem of layout limitation due to the fact that only positive electrodes and negative electrodes at a few points are set at present can be solved.

Description

technical field [0001] The invention relates to a reflective photoelectric sensor, in particular to a reflective photoelectric sensor used for gingival blood flow monitoring and a preparation method of the reflective photoelectric sensor. Background technique [0002] Cases of oral dentition and soft tissue defects due to tumor resection, trauma, or long-term missing teeth have been on the rise. When the amount of soft tissue is insufficient due to various reasons, free soft tissue grafts are often required in order to restore the shape of the soft tissue and ensure the health and aesthetic effect of the surrounding tissue. Therefore, it is necessary to monitor the gingival blood flow status in real time after oral soft tissue surgery, accurately and timely grasp the growth of free soft tissue grafts, and then take corresponding medical measures. [0003] However, there are very limited methods for observing blood flow in gingival tissue. The non-invasive methods currently...

AI Technical Summary

Problems solved by technology

[0005] At present, there are many reflective photoelectric sensors on the market, such as: DCM02, DCM03, and DCM05 series produced by APMKorea Company in South Korea; Japan Wireless Co., Ltd. has developed reflective photoelectric sensors NJL5501R and NJL5303R; these sensors are not only large in size as mentioned above, It is not suitable for defects of thin translucent tissue, and the arrangement of such reflective photoelectric sensors is generally as follows figure 1 As shown, the transmitting part and the receiving part are arranged separately, but this arrangement will lead to a small receiving area of ​​the photoelectric receiving tube, which in turn will cause the photoplethysmography signal collected by the reflection method to have poor measurement accuracy, anti-interference, stability, etc. Insufficient performance

Images