Medical oxygen concentration intelligent monitoring system and method
An intelligent monitoring and oxygen concentration technology, applied in the field of detection systems, can solve the problems of poor interchangeability, shortened service life of oxygen electrodes, single circuit function, etc., and achieve the effect of low cost, no debugging, and good interchangeability
Inactive Publication Date: 2013-08-07
江苏蓝韵凯泰医疗设备有限公司
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Problems solved by technology
[0004] 1. Since the added pull-up resistor is always connected to the oxygen electrode, it is equivalent to continuously discharging the oxygen electrode. Although the discharge current is small, it keeps discharging, even when the ventilator is not turned on, resulting in the service life of the oxygen electrode. is shortened, increasing the user cost
[0005] 2. The circuit is a pure analog amplifier circuit, which is not convenient for production and debugging, and has poor interchangeability
[0006] 3. The function of the circuit is single. When the oxygen electrode is almost exhausted, the user cannot be reminded to replace it in time. When the oxygen concentration is not accurate, the user cannot be reminded to calibrate in time.
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[0029] Such as figure 2 As shown, the positive terminal of the oxygen electrode is connected to the positive terminal of the AD sampling circuit through the resistor R1, the negative terminal of the oxygen electrode is connected to the negative terminal of the AD sampling circuit through the resistor R2, and the micro-current constant current source I1 (assuming I1=2uA) passes through The switch K1 is connected to the positive terminal of the AD sampling circuit, the micro-current constant current source I2 (assuming I2=2uA) is connected to the negative terminal of the AD sampling circuit through the switch K2, the switch K1 and the switch K2 are completely controlled by the microcontroller, and the microcontroller The device is connected to the AD sampling circuit.
[0030] Due to the slow response of the oxygen electrode, the AD sampling circuit is recommended to use a high-precision AD conversion circuit based on Δ-Σ, with a precision not lower than 24bit, so that high-pre...
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The invention discloses a medical oxygen concentration intelligent monitoring system and a method. The system comprises an oxygen electrode; an AD sampling circuit, wherein a positive terminal and a negative terminal of the AD sampling circuit are respectively coupled with a positive terminal and a negative terminal of the oxygen electrode; two micro-current constant current sources connected with the positive terminal and the negative terminal of the AD sampling circuit respectively through a switch K1 and a switch K2; and a micro controller connected with an output terminal of the AD sampling circuit and provided for judging an oxygen electrode connection state according to an output result of the AD sampling circuit and measuring an output oxygen concentration of the oxygen electrode. With the present invention, an oxygen electrode connection state (open circuit, short circuit or normal connection) can be accurately determined while a service life of the oxygen electrode is not damaged so as to achieve simpleness, safety and reliability.
Description
technical field [0001] The invention relates to a detection system, in particular to an intelligent monitoring system and method for medical oxygen concentration used in medical equipment. Background technique [0002] The common oxygen concentration sensor on the ventilator is an oxygen electrode based on electrochemical reaction. The supporting oxygen concentration monitoring module is usually an analog circuit board, which amplifies the mv-level signal (about 0-85mv) input by the oxygen electrode to about 0-1V. Then it is sent to the follow-up circuit for processing through the analog interface, and the follow-up circuit obtains the real oxygen concentration value after hardware filtering, AD sampling circuit and microcontroller operation processing. [0003] Such as figure 1 Shown is an existing oxygen concentration detection circuit. This circuit is used to judge whether the oxygen electrode is connected. The circuit adds a high resistance pull-up resistor to the outpu...
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Inventor 向越宏陈洪彬张培林蔡春辉
Owner 江苏蓝韵凯泰医疗设备有限公司