Monitoring method for layering condition of whole blood in centrifugal cup and photoelectric sensing device

Abstract

The invention relates to a monitoring method for a layering condition of whole blood in a centrifugal cup and a photoelectric sensing device. The monitoring method is used for detecting different blood layers in the centrifugal cup. The device provided by the invention comprises an optical transmitter, an optical receiver and an electronic circuit; the electronic circuit is composed of a light source driving module and a photoelectric signal processing module; the light source driving module is connected to the optical transmitter; the photoelectric signal processing module is connected to the optical receiver; a certain included angle is formed between the axis of the optical transmitter and the axis of the optical receiver; the optical transmitter is driven by the light source driving module to transmit a detecting light beam to the detecting region on the shoulder of the centrifugal cup; diffuse reflection light of the blood layer in the centrifugal cup is used as signal light to be received by the optical receiver, and a photoelectric signal is output and analyzed and processed by the photoelectric signal processing module; and a red blood cell layer is judged by an analyzing and processing module by using a slope detection method. The method and device provided by the invention can be used for reducing the light loss, increasing the utilization ratio of light energy, and further increasing the signal to noise ratio of a sensor and improving the adaptability of the sensor.

Description

technical field [0001] The invention relates to blood processing equipment, in particular to a photoelectric sensor device for detecting the blood layer in a centrifuge cup in the blood centrifugation equipment. Background technique [0002] In the process of using centrifugal cups to separate blood components, it is necessary to use detection and monitoring technology to determine the best time for the end of blood component separation, and to implement corresponding automatic control operations. For example, in a plasmapheresis instrument, sensors are needed to determine the best time to end plasma collection. In the autologous blood recycling machine, it is necessary to use sensors to determine whether the red blood cells in the centrifuge cup are full, so as to prevent red blood cells from overflowing. [0003] In the process of blood centrifugation, various blood components are subjected to different centrifugal forces due to different specific gravity, causing them to...

AI Technical Summary

Problems solved by technology

[0006] The above two centrifuge cup blood layer photoelectric sensing devices are installed on the wall of the centrifuge well, and the sensor is far away from the light detection area. Due to the long receiving optical path, the received signal light is weak

In addition, the signal strength they receive is also limited by the shape of the centrifugal cup. If the angle between the receiving optical path and the surface normal of the detection area on the shoulder of the centrifugal cup is large, the reflection in this direction will be weak, making the detected signal strength even weaker.

For the solution of using optical fiber to guide light, although its appearance is small, the assembly is complicated, and the optical coupling between the light source and the optical fiber and the optical fiber itself also have the loss of light energy.

In addition, due to the common optical path of transmitting and receiving, the stray light generated by the transmitting light is easy to be strayed into the signal light, thereby reducing the signal-to-noise ratio of the photoelectric signal

For the scheme using a spectroscope, although the emitted light does not interfere with the signal light, the loss of light energy due to light splitting is very large, and the utilization rate of light energy is very low

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