The blood gas analyser was invented in Denmark and has always played an important role in medical testing. With the continuous development of technology, its various performances are gradually improved and optimized.
Today's blood gas analysers have added various intelligent functions, intelligent data processing, and automatic diagnosis functions. In order to meet the growing demand for POCT, blood gas analysers are developing in the direction of being portable, maintenance-free and easy to operate.
The electrode measurement system of the blood gas analyser includes pH measurement electrodes, PCO2 measurement electrodes, and PO2 measurement electrodes.
1. The pH measuring electrode is a glass electrode, which is composed of Ag-AgCl electrode and an appropriate amount of buffer solution. It mainly uses the membrane potential to measure the H+ concentration in the solution. The reference electrode is a calomel electrode, and its function is to provide a reference potential for the pH electrode.
2. The main structure of the PC02 measuring electrode is a gas-sensing electrode. The key lies in the single-permeable permeable membrane of the CO2 molecule at the top of the electrode of the blood gas analyser. The PCO2 value is obtained by measuring the pH change value and then logarithmic transformation.
3. The PO2 measuring electrode is composed of Pt-Ag electrode based on the principle of electrolytic oxygen. Under the selective action of the gas permeable membrane, a certain voltage is applied externally, and the O2 in the blood is reduced at the Pt cathode.
At the same time, a stable electrolytic current is formed, and PO2 in the blood sample is determined by measuring the current change.
The pipeline system of the blood gas analyser is a key part set up to complete functions such as automatic calibration, automatic measurement, and automatic flushing.
The circuit system of the blood gas analyser is mainly aimed at the amplification and analog-to-digital conversion of the measurement signal of the instrument, and the display and printing results. In recent years, the development of blood gas analysers is mostly reflected in the upgrading of the circuit system, and the automatic analysis process is completed under the execution of computer programs.
1. Emergency room: coma, shock, high fever, poisoning, acute diarrhea, edema, cardiopulmonary resuscitation.
2. Department of Anesthesiology: General anesthesia surgery, preoperative and postoperative identification of the elderly, thoracic surgery (large blood transfusion of more than 2000ml).
3. ICU: Before and after boosting drugs, before and after using a ventilator machine and the basis for adjusting the ventilator machine, before and after the rescue of critically ill patients.
4. Department of Respiratory Medicine: dynamic observation of asthma, dynamic observation of type I and type II respiratory failure, dynamic observation of ARDS before and after oxygen therapy.
5. Internal medicine: after diuresis, wake up after coma, cerebral hemorrhage, myocardial infarction, renal insufficiency, renal failure, hemodialysis.
6. General surgery: postoperative decompression of patients with general anesthesia and gastrointestinal decompression.