Improve your life, embrace Your health -- Pulse Oximeter and its inventor, Tadao Qingliu


The most valuable thing about pulse oximetry is that oxygen saturation is one of the few things we can monitor in real time. In a world plagued by COVID-19, blood oxygen monitoring is more important than ever.It has been found that patients with mild to moderate symptoms of COVID-19 may have dangerously low blood oxygen levels, which can lead to serious complications.A pulse oximeter can provide a "warning signal" for patients whose condition worsens but who may still not have difficulty breathing.In this smokeless battle, oximeters have virtually saved countless lives.

Takuo Aoyagi, known as the "father of modern oximetry", died in Tokyo on April 18th, aged 84.The Pulse oximeter, a noninvasive measure of oxygen saturation in a patient's arterial blood, or hemoglobin oxygen saturation, has become an essential part of the novel Coronavirus novel for hospitals around the world and has been indispensable for the global fight to the novel Coronavirus in recent months.

Pulse oximeter

Yet the inventor of such a tool for global benefit was little known until his death in Tokyo last month, when his name was mentioned online.

When we try to tell the life story of a scientist, we often find that although he or she has written a lot of books and scientific achievements, there are few articles about him or her on the Internet.Even so, we can still get a glimpse of their extraordinary lives and great souls in these few graphic materials.

In medicine, many clinical diseases will cause the lack of oxygen supply of patients, and even lead to the death of patients due to lack of oxygen during operation. Therefore, real-time monitoring of arterial oxygen concentration is very important in clinical rescue.

The traditional measurement method of blood oxygen saturation is to collect human blood first (usually the arterial blood from the radial artery and the femoral artery), and then analyze and measure blood oxygen saturation with a blood gas analyzer.However, this repeated blood drawing can easily lead to pseudoaneurysms in patients and cause a lot of unnecessary pain.The biggest problem is that the method usually takes at least 20 to 30 minutes to get results, so there is no real time monitoring, and the delay can be fatal because hypoxia can cause severe brain damage within five minutes.As a result, 1936 was a landmark year for many medical workers who wanted to provide sufficient oxygen to anaesthetists and to monitor their blood oxygen levels in real time.

In that year Cyril Courville, a neuropathologist, published his landmark paper in a medical journal: "Asphyxia as a Consequence of Nitrous Oxide Anesthesia," showing the risks of clinical Anesthesia;That same year, the New York Anesthesiologist expanded and became the American Society of Anesthetists (ASA).

As an educational and academic organization for anesthesiologists, the ASA is committed to the safety of anesthesiology by improving and maintaining standards of medical practice for clinical anesthesia, and by strengthening the monitoring of anesthesia for patients.Eighty years later, the ASA Charitable Foundation supports the Lifebox Project, which provides pulse oximeters for safer anesthesia in "resource-poor countries" around the world.

In the same year, a legendary little boy was born into an ordinary family in Niigata prefecture, on Japan's west coast: his father was a maths teacher and his mother a housewife.He is The future outstanding biomedical engineer and the father of modern blood oxygen measurement technology Zhuoxiong Qingliu.Since the advent of Qingliuzhuoxiong's pulse oximeter, all the problems of blood oxygen saturation measurement in anesthetic surgery have been solved.During the operation, the oxygen saturation of human blood can be continuously and noninvasively measured by placing the measuring instrument on the patient's finger.