Oximeter

An oximeter, comprising:

• a blood oxygen collecting circuit that has a first light emitting circuit, a second light emitting circuit, and a light receiving sensor, the first light emitting circuit emitting a red light, the second light emitting circuit emitting an infrared light, and the light receiving sensor receiving the red light emitted by the first light emitting circuit and not absorbed by a human body and the infrared light emitted by the second light emitting circuit and not absorbed by the human body, and converting them into an electrical signal;
• a storage circuit that stores a first threshold value and a second threshold value smaller than the first threshold value;
• a microprocessor that calculates a blood oxygen saturation of the human body based on the electrical signal detected by the light receiving sensor, and judges whether the blood oxygen saturation is lower than the first threshold value;
• and
• a display that, in a case where the microprocessor judges that the blood oxygen saturation is lower than the first threshold value, flickeringly displays the blood oxygen saturation at a first frequency and/or displays the blood oxygen saturation in a first brightness,
• wherein the microprocessor, in a case where it is judged that the blood oxygen saturation is lower than the first threshold value, judges whether the blood oxygen saturation is lower than the second threshold value,
• wherein the display, in a case where the microprocessor judges that the blood oxygen saturation is lower than the second threshold value, flickeringly displays the blood oxygen saturation at a second frequency greater than the first frequency and/or displays the blood oxygen saturation in a second brightness greater than the first brightness,
• wherein the storage circuit further stores a first duration,
• wherein the microprocessor, in a case where it is judged that the blood oxygen saturation is lower than the first threshold value, judges whether a duration in this case exceeds the first duration, and
• wherein the display, in a case where the microprocessor judges that the blood oxygen saturation is lower than the first threshold value and it continues for the first duration, flickeringly displays the blood oxygen saturation at the first frequency,
• at least one of the first duration, a second duration, and a third duration is calculated based on the following Equation 2:
• T=((Ht−Lt)/(B−1)*A+Lt)/(B−A) Equation 2
• where A is measured data, B is a set threshold value, Ht is the maximum delay time, and Lt is the minimum delay time.