JP2005126049A - Information processing device for divers, controlling method and program of information processing device for divers, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further reduce the risk of oxygen intoxication and hypoxia. <P>SOLUTION: A living body sensor unit 15 noninvasively and optically measuring living body information having a correlation with the amount of oxygen dissolved in the blood of a diver; and a controlling portion 50 controlling a warning portion 39 and carrying out warning when the amount of the oxygen dissolved in the blood is estimated to be out of a specified safe dissolved oxygen amount range on the basis of the measured living body information, are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information processing apparatus for divers, a control method thereof, a control program, and a recording medium, and in particular, an information processing apparatus for divers (hereinafter referred to as a dive computer) that can further reduce the risk of oxygen poisoning or hypoxia. ), Its control method, control program, and recording medium.

Conventionally, a dive computer for providing various information to a diver in order to ensure the safety of the diver is known (see, for example, Patent Document 1).
Conventionally, a mixed gas diving is known in which diving is performed using a gas in which nitrogen and oxygen are mixed in an artificial ratio (hereinafter referred to as a mixed gas).
Nitrox diving and trimix diving are known as such mixed gas diving methods.
Nitrox diving has a higher oxygen ratio (= 25-50 [%]) than ordinary air (nitrogen about 79 [%] + oxygen about 21 [%]), and is a mixed gas of high oxygen concentration and low nitrogen. It is a diving method using Rocks.
The advantages of Nitrox diving include:
・ Uncompressed diving time at the same depth is longer than air diving.
・ It is less susceptible to nitrogen sickness at the same depth than air diving.
-The surface break time during repeated diving is shorter than during air diving at the same depth.
・ Gas pressure decrease time after diving is shortened and repeated diving can be performed longer.
・ Altitude diving is more advantageous than air diving.
・ Effective for aircraft use and high altitude passage after diving.
Trimix diving is a diving using a mixed gas developed for deep diving, and uses a gas in which helium is mixed in addition to normal nitrogen oxygen.
The advantages of Trimix diving include:
・ Reduction of nitrogen sickness at large depth ・ Reduction of oxygen poisoning at large depth
Japanese Patent Laid-Open No. 11-20787

However, since Nitrox diving uses a mixed gas having a high oxygen concentration, there is a problem that there is a high risk of oxygen poisoning if used incorrectly.
In this oxygen poisoning, the central nervous system (brain) is violated by inhaling a high concentration of oxygen in an environment of 2 atm or more (water depth of 10 m or more), causing consciousness, convulsions, and paralysis within a short time. Acute oxygen poisoning that can cause fatal death and chronic oxygen poisoning (pulmonary oxygen poisoning) that causes inflammation in breathing by maintaining oxygen inhalation for a long time in an environment slightly higher than atmospheric pressure ing.
Trimix diving, on the other hand, is intended to reduce the risk of nitrogen sickness and oxygen poisoning at large depths. Generally, by adding helium, both nitrogen concentration and oxygen concentration are more than the gas used for normal diving. Is also a low concentration. For example, a gas having a helium concentration FHe = 40%, an oxygen concentration FO2 = 8%, and a nitrogen concentration FN2 = 52% is used.
The gas having such a mixing ratio has no problem when used at a large depth, but when used at a shallow water depth, it absorbs oxygen lower than the normal oxygen concentration, and the low oxygen concentration. There was a problem that the risk of getting sick was high.
Therefore, even in an underwater environment, it is necessary to keep the oxygen partial pressure in the same state as that on land.
However, considering the possibility of oxygen poisoning or oxygen deficiency, if it is likely that the oxygen concentration in the same state as the terrestrial environment cannot be maintained, the dive computer needs to inform the diver to that effect. It becomes.
Accordingly, an object of the present invention is to provide an information processing apparatus for divers, a control method thereof, a control program, and a recording medium that can further reduce the risk of oxygen poisoning and hypoxia.

In order to solve the above-described problem, a divers information processing apparatus includes a biological information measuring unit that non-invasively and optically measures biological information correlated with the amount of dissolved oxygen in a blood of a diver, and the biological information. And a warning unit that issues a warning when it is estimated that the amount of dissolved oxygen in the blood deviates from a predetermined safe dissolved oxygen amount range. Here, non-invasive means that the body is not damaged.
According to the said structure, a biological information measurement part measures the biological information which has a correlation with the amount of dissolved oxygen in the blood of a diver noninvasively and optically.
The warning unit issues a warning when it is estimated that the dissolved oxygen amount in the blood is out of the predetermined safe dissolved oxygen amount range based on the measured biological information.

In this case, the warning unit may lead to oxygen poisoning when it is estimated that the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information. You may make it perform the warning to that effect.
In addition, an oxygen partial pressure calculation unit that calculates an oxygen partial pressure based on an ambient pressure of the diver and an oxygen concentration in the air supplied to the diver is provided, and the warning unit has a predetermined oxygen partial pressure calculated in advance. When the reference oxygen partial pressure is exceeded, it may be determined whether or not the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information.

Furthermore, the warning unit may lead to hypoxia when it is estimated that the dissolved oxygen amount in the blood is less than the lower limit dissolved oxygen amount in the safe dissolved oxygen amount range based on the biological information. You may make it perform the warning to that effect.
Furthermore, an altitude range discriminating unit that discriminates an altitude range in which the information processing apparatus for divers is located based on ambient atmospheric pressure, the warning unit includes the altitude range being a predetermined altitude range, and the living body When it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the information, a warning that there is a possibility of hypoxia may be performed. Good.
The biological information measurement unit may measure the oxygen saturation of the diver.

The biological information measurement unit includes a first light source that irradiates a biological tissue including an arterial blood flow with a first measurement light having a first wavelength, and a biological light source that includes the arterial blood flow has a second wavelength. 2 a second light source for irradiating measurement light; a light receiving part for receiving the first measurement light and the second measurement light after part of the living tissue is absorbed; and a light receiving state of the light receiving part. A calculation unit that calculates the oxygen saturation based on the absorbance of each of the corresponding first measurement light and second measurement light.
Furthermore, the wavelength of the first measurement light belongs to a wavelength region in which the absorbance of oxyhemoglobin is smaller than the absorbance of reduced hemoglobin in the arterial blood flow, and the wavelength of the second measurement light is in the arterial blood flow. It may be made to belong to a wavelength region where the absorbance of oxyhemoglobin is larger than the absorbance of reduced hemoglobin.
Furthermore, the center wavelength of the first measurement light may be about 660 nm, and the center wavelength of the second measurement light may be about 470 nm.
The biological information measurement unit includes a body movement measurement unit that detects the body movement of the diver, and the calculation unit calculates the pulse rate of the diver based on the light reception state of the light receiving unit and the detected body movement. You may make it calculate.
Furthermore, the warning unit may determine whether there is an abnormality in the pulse rate, and may issue a warning when it is determined that the state is abnormal.

In addition, the control method of the information processing apparatus for divers is based on the biological information measurement process for non-invasively and optically measuring biological information correlated with the amount of dissolved oxygen in the blood of the diver, and the biological information. A warning process for giving a warning when it is estimated that the amount of dissolved oxygen in the blood is out of a predetermined safe dissolved oxygen amount range.
In this case, the warning process may lead to oxygen poisoning when it is estimated that the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information. You may make it perform the warning to that effect.
In addition, an oxygen partial pressure calculation process for calculating an oxygen partial pressure based on an ambient pressure of the diver and an oxygen concentration in the air supplied to the diver is provided, and the warning process includes a predetermined oxygen partial pressure calculated in advance. When the reference oxygen partial pressure is exceeded, it may be determined whether or not the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information.
Furthermore, the warning process may lead to hypoxia when it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information. You may make it perform the warning to that effect.
Furthermore, an altitude range discriminating process for discriminating an altitude range in which the information processing apparatus for divers is located based on the ambient atmospheric pressure, the warning process includes the altitude range being a predetermined altitude range, and the living body If it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the information, a warning that there is a possibility of hypoxia may be performed. Good.

In addition, a control program for causing a computer to control the information processing apparatus for divers causes non-invasive and optical measurement of biological information correlated with the amount of dissolved oxygen in the blood of the diver. Based on the above, a warning is issued when it is estimated that the amount of dissolved oxygen in the blood is out of a predetermined safe dissolved oxygen amount range.
In this case, when it is estimated that the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information, a warning is given that oxygen poisoning may occur. You may make it let.
Further, the oxygen partial pressure is calculated based on the ambient pressure of the diver and the oxygen concentration in the air supplied to the diver, and when the calculated oxygen partial pressure exceeds a predetermined reference oxygen partial pressure, Based on the biological information, it may be determined whether or not the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range.
Further, when it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount in the safe dissolved oxygen amount range based on the biological information, a warning is given that there is a possibility of hypoxia. You may do it.
Furthermore, the altitude range where the information processing apparatus for divers is located is determined based on the ambient pressure, the altitude range is a predetermined altitude range, and the amount of dissolved oxygen in the blood is determined based on the biological information. When it is estimated that the amount is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range, a warning that there is a possibility of hypoxia may be given.
It is also possible to record each control program on a computer-readable recording medium.

  According to the present invention, biological information (oxygen saturation) correlated with the amount of dissolved oxygen in a diver is measured noninvasively and optically, and dissolved oxygen in the blood based on the obtained biological information. Since the warning is performed when the amount is estimated to be out of the predetermined safe dissolved oxygen amount range, more accurate warning processing can be performed and the safety of the diver can be ensured.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
[1] Schematic Configuration of Dive Computer FIG. 1 is a diagram showing an external configuration of a dive computer according to an embodiment, together with its usage. FIG. 2 is an external front view of the dive computer main body.
The dive computer 10 calculates and displays the diver's depth and diving time during diving and measures the oxygen saturation level correlated with the amount of dissolved oxygen in the diving so as not to cause oxygen poisoning or oxygen deficiency. To display a warning or to measure the amount of inert gas (mainly nitrogen gas) accumulated in the body. From this measurement result, nitrogen accumulated in the body in the state of rising from the water after diving is discharged. It is configured to display the time until completion.
As shown in FIG. 1, a dive computer 10 includes a dive computer main body 11 having a wrist watch structure, and a wristband provided on the dive computer main body 11 and wound around a diver's arm to fix the dive computer main body 11. 12, a biosensor unit 15 for detecting oxygen saturation and pulse as ecological information, and a sensor for fixing the biosensor unit 15. And a fixed band 16.

The dive computer main body 11 has an upper case and a lower case fixed in a completely watertight state by a method such as screwing, and incorporates various electronic components (not shown). A display unit 100 having a liquid crystal display panel 101 is provided on the front side of the dive computer main body 11 in the drawing.
Further, an operation unit 102 for selecting / switching various operation modes in the dive computer 10 is formed on the lower side of the dive computer main body 11, and the operation unit 102 has two push button type switches A and B. doing. On the left side of the dive computer main body 11, a diving operation monitoring switch 103 using a continuity sensor used to determine whether or not diving has started is configured. The diving operation monitoring switch 103 has electrodes 103A and 103B provided on the front side of the dive computer main body 11 in the drawing, and the electrodes 103A and 103B are brought into conduction by seawater or the like, so that the electrodes 103A and 103B are connected. When the resistance value becomes small, it is determined that water has entered. However, the diving operation monitoring switch 103 is only used for detecting that water has entered and for shifting the operation mode of the dive computer 10 to the diving mode, and detects that the diving (diving) has actually started. Is not used for In other words, the arm of the user wearing the dive computer 10 may have just been immersed in seawater, and it is not preferable to determine that diving has started in such a state.

For this reason, in the dive computer 10, the water pressure (water depth) is not less than a certain value by the pressure sensor built in the dive computer body 11, more specifically, the water pressure is not less than 1.5 [m] equivalent to the water depth. If the water pressure is less than 1.5 [m] at the water depth, it is considered that the dive has been completed.
In addition, a connector portion 13 is provided on the outer periphery of the dive computer main body 11 in the 6 o'clock direction. As described above, the biosensor unit 15 for detecting biological information is connected to the cable 14 by the connector portion 13. Connected through.
This biosensor unit 15 functions as a pulse oximeter that measures oxygen saturation and pulse waves as biometric information.
FIG. 3 is an explanatory diagram of a mounted state of the biosensor unit.
The biosensor unit 15 is fixed near the base of the user's finger by the sensor fixing band 16, and detects biometric information (oxygen saturation and pulse wave) by irradiating light to the blood vessel.
FIG. 4 is a diagram schematically showing the configuration of the biosensor unit.
As shown in FIG. 4, the biosensor unit 15 includes a unit body 15D including a sensor frame 15A, a back cover 15B that closes the lower surface of the sensor frame 15A, and a glass plate 15C that closes the upper surface.

The unit body 15D includes a circuit board 15E, two LEDs 15F1 and 15F2 mounted on the circuit board 15E, and a photodetector 15G. In addition, a cable 14 is connected to the circuit board 15E, and a living body detection signal that is a detection signal from the photodetector 15G is output to the dive computer main body 11 via the cable 14. In addition, power is supplied to the circuit board 15E from a battery (not shown) built in the dive computer main body 11 via the cable 14.
Here, the wavelength (center wavelength) of the LED 15F1 is about 470 nm, a GaN-based (gallium-nitrogen-based) blue LED is used, and the wavelength (center wavelength) of the LED 15F2 is about 660 nm, which is a GaAlAs system. A (gallium-aluminum-arsenic) red LED is used. The light emission surfaces of the LEDs 15F1 and 15F2 and the light receiving surface of the photodetector 15G are opposed to the glass plate 15C, and the light emitted from each of the LEDs 15F1 and 15F2 toward the blood vessel is reflected by the blood vessel, and the amount of reflected light is A so-called reflection type sensor is used, which passes through the glass plate 15C and is detected by the photodetector 15G. In general, when the wavelength is short, the absorption of light in the living body becomes strong, and the transmitted light that passes through the finger is weak. Therefore, it is difficult to measure biological information using the transmitted light. However, as described above, by adopting a configuration for detecting reflected light, a sufficient amount of light enters the photodetector 15G, and it is possible to measure biological information measurement.

FIG. 5 is a plan view of the biosensor unit.
As shown in FIG. 5, two transmission filters 15G1 and 15G2 having different transmission wavelength characteristics are pasted so as to divide the light receiving surface of the photodetector 15G. The transmission filter 15G1 transmits only light in the wavelength region of the LED 15F1 (ie, near 470 nm), and the transmission filter 15G2 transmits only light in the wavelength region of the LED 15F2 (ie, near 660 nm). With this configuration, it is possible to detect the amount of light in each wavelength region of the LEDs 15F1 and 15F2 by one photo detector 15G. At the time of biological information measurement, the LEDs 15F1 and 15F2 emit light alternately in a time-division manner, and the amount of reflected light detected by the light emission of the LED 15F1 or LED 15F2 is output to the dive computer main body 11 as a biological detection signal.
The glass plate 15C is formed of a glass material having high transmission characteristics at least in the wavelength regions of the LEDs 15F1 and 15F2 (near 470 nm and 660 nm), and light in other wavelength regions is attached to the surface of the glass plate 15C. It is configured to be cut by a transmission filter (not shown), and the entry of extraneous light into the unit body 15D is prevented as much as possible, and noise due to extraneous light is prevented from being included in the photodetector 15G. In this embodiment, since the LED 15F1 that emits blue light with a wavelength of about 470 nm and the LED 15F2b that emits red light with a wavelength of about 660 nm are used, it is possible to measure biological information without being affected by external light. It has become.

FIG. 6 is a schematic block diagram of the dive computer.
As shown in FIG. 6, the dive computer 10 is roughly classified into a display unit 100 that displays various information, an operation unit 102 for performing various operations, a diving operation monitoring switch 103, and an alarm sound from a buzzer and the like. A sound generating device 37 for performing notification, a vibration generating device 38 for notifying the user by vibration, a control unit 50 for controlling the entire dive computer, a pressure measuring unit 61 for measuring atmospheric pressure or water pressure, and a time measuring unit for performing various time measuring processes. 68 is provided.
The display unit 100 includes a liquid crystal display panel 101 for displaying various types of information and a liquid crystal driver 21 for driving the liquid crystal display panel 11.
The control unit 50 is connected to the switches A and B (= the operation unit 102), the diving operation monitoring switch 103, the sound reporting device 37, and the vibration generating device 38, and also controls the CPU 51 for controlling the entire device, and the control of the CPU 51. The control circuit 52 for controlling the liquid crystal driver 21 to cause the liquid crystal display panel 101 to perform display corresponding to each operation mode, or for performing processing in each operation mode in the time counter 33 described later, a control program, and A ROM 53 that stores control data and a RAM 54 that temporarily stores various data are provided.

The pressure measuring unit 61 measures and displays the water depth (water pressure) in the dive computer 10 and measures the amount of inert gas (mainly nitrogen gas amount) accumulated in the user's body from the water depth and diving time. Therefore, the pressure and water pressure are measured. The pressure measurement unit 61 includes a pressure sensor 34 constituted by a semiconductor pressure sensor, an amplification circuit 35 for amplifying an output signal of the pressure sensor 34, an amplification circuit 35, an amplification circuit 41 described later, and an amplification circuit 43 described later. And an A / D conversion circuit 36 that performs analog / digital conversion of the output signal and outputs the converted signal to the control unit 50.
In the dive computer 1, the time measuring unit 68 outputs a clock signal having a predetermined frequency and divides the clock signal from the oscillation circuit 31 in order to measure the normal time and monitor the dive time. And a time counter 33 that performs time-counting processing in units of one second based on the output signal of the frequency dividing circuit 32.
An amplification circuit 41 is connected to the biological sensor unit 15 via the cable 14, and the amplification circuit 41 amplifies the output signal of the biological sensor unit 15 and outputs the amplified signal to the A / D conversion circuit 36.
The body motion sensor 42 includes an acceleration sensor for detecting the user's body motion during diving. The body motion sensor 42 is built in the dive computer main body 11, detects the acceleration in the arm accompanying the user's diving operation, and outputs it to the amplification circuit 43 as a body motion signal. As a result, the amplification circuit 43 amplifies the body motion signal and outputs it to the A / D conversion circuit 36.

Next, the configuration of the display unit will be described in detail with reference to FIG.
The display surface of the liquid crystal display panel 101 constituting the display unit 100 is composed of nine display areas. The display area of the liquid crystal display panel 101 has eight display areas, and is roughly divided into a display area 101A located in the center and an annular display area 101B located on the outer peripheral side thereof. In the present embodiment, the display area 101A and the annular display area 11B are circular. However, the display area 101A and the circular display area 11B are not limited to a circular shape, and may have other shapes such as an elliptical shape, a track shape, and a polygonal shape. It doesn't matter.
Of the display areas 101A, the first display area 111 located on the upper left side of the drawing is configured to be the largest among the display areas. In the diving mode, surface mode (time display mode), planning mode, and log mode, which will be described later. , The current water depth, current date, water depth rank, and diving date (log number) are displayed.
The second display area 112 is located on the right side of the first display area 111 in the drawing. In the diving mode, the surface mode (time display mode), the planning mode, and the log mode, the diving time and oxygen saturation, the current time, No decompression dive time and dive start time (dive time) are displayed.

The third display area 113 is located on the lower side of the first display area 111 in the drawing. In the diving mode, the surface mode (time display mode), the planning mode, and the log mode, respectively, the maximum water depth, the body nitrogen discharge time, The safety level and maximum water depth (average water depth) are displayed.
The fourth display area 114 is located on the right side of the third display area 113 in the drawing. In the diving mode, the surface mode (time display mode), the planning mode, and the log mode, the no-decompression dive time, the water surface rest time, The temperature and the dive end time (maximum depth water temperature) are displayed.
The fifth display area 115 is located on the lower side of the third display area 113 in the drawing, and the power supply capacity out warning display portion 115A for displaying the power out of capacity and the altitude rank for displaying the altitude rank to which the user's current altitude belongs. A display portion 115B is provided.
The sixth display area 116 is located on the lower left side of the drawing in the display area 101A, and the pulse state or the amount of nitrogen in the body is displayed in a graph.

The seventh display area 117 is located on the right side of the sixth display area 116 in the drawing. When the diving mode is in a reduced pressure diving state, nitrogen gas (inert gas) tends to be absorbed or discharged. An area indicating whether there is an up / down arrow in the figure, an area displaying “SLOW” for instructing deceleration as one of the ascent warnings when the ascent speed is too high, and diving And an area for displaying “DECO” for warning that decompression diving must be performed.
The eighth display region 118 is located on the right side of the second display region 112 and the fourth display region 114 in the drawing, and the ascent rate is displayed in a graph with nine segments. For example, the ascent rate is ascending in the current water depth region. When the upper limit speed is exceeded, all nine segments are displayed in a blinking manner to notify the diver that the upper limit speed of levitation in the current water depth has been exceeded.
On the other hand, although not shown, the display area 101B is configured as a rotating bezel, and if the alignment mark (for example, the ▽ mark) of the rotating bezel is aligned with the minute hand or hour hand in advance, the elapsed time is known and the position If the set mark is set to the target time, the remaining time can be understood. Therefore, it is possible to set the time after diving in the water or the expected start time of ascent.

Here, prior to the description of the operation of the embodiment, detection of oxygen saturation and pulse wave, which are biological information, will be described.
The amplification circuit 41 described above amplifies the biological detection signal from the biological sensor unit 15 and outputs the amplified biological detection signal to the A / D conversion circuit 36. The A / D conversion circuit 36 performs analog / digital conversion on the received biological detection signal and outputs it to the CPU 51 only while the control signal is input from the CPU 51. The frequency component of the living body detection signal is calculated by executing a (Fast Fourier Transform) process, and the biological spectrum signals Fsa and Fsb are obtained. Here, in order to individually detect the amount of reflected light corresponding to the two LEDs 15F1 and 15F2 included in the biosensor unit 15, the CPU 51 causes the LEDs 15F1 and 15F2 to alternately emit light in a time division manner, and is detected when the LED 15F1 emits light. The biological spectrum signal Fsa based on the biological detection signal and the biological spectrum signal Fsb based on the biological detection signal detected when the LED 15F2 emits light are separately obtained.

The biological detection signal, that is, the biological spectrum signals Fsa and Fsb includes information indicating oxygen saturation and pulse rate in blood as biological information. More specifically, when light is emitted from the LEDs 15F1 and 15F2 toward the finger, this light reaches the blood vessel, and part of it is absorbed by hemoglobin (oxygenated hemoglobin, reduced hemoglobin) in the blood, and part of the light is reflected. The light reflected from the living body (blood vessel) is received by the photodetector 15G, and the change in the amount of received light corresponds to the change in blood volume caused by the pulse wave of blood.
Specifically, when the blood volume is large, the absorption of light in hemoglobin increases, so that the reflected light becomes weak, while when the blood volume decreases, the reflected light becomes strong. Therefore, if the change in the reflected light intensity is monitored by the photodetector 15G, the pulse can be detected from the pulsation cycle of the reflected light intensity (that is, the biological spectrum signals Fsa and Fsb).

Although the detailed description is omitted, the oxygen saturation SPO2 (Saturation Pulse Oxygen) is a pulse wave component of absorbance with respect to light of the wavelength of the LED 15F1 (480 nm in this embodiment) as shown in the following equation (1). It is obtained from the intensity ratio between the ACa and the pulse wave component ACb of the absorbance with respect to the light of the wavelength of the LED 15F2 (in this embodiment, 660 nm).
Oxygen saturation SpO2 = f (ACb / ACa) (1)
However, the function f is a predetermined function determined by the absorbance at each wavelength of the LEDs 15F1 and 15F2.

Since there is a variation in sensitivity depending on the light emission intensity of the light emitting elements (LEDs 15F1 and 15F2) and the wavelength of the light receiving element (photodetector 15G), the pulse wave component AC of the absorbance is actually expressed as shown in the following equation (2). A more accurate oxygen saturation SPO2 is obtained by dividing and normalizing by a direct current component DC (a component including variations in emission intensity of light emitting elements, absorption of body tissues, variations in performance of electric circuits, etc.).
SPO2 = f ((ACb / DCb) / (ACa / DCa)) (2)
When the above equation (2) is expressed using the biological spectrum signals Fsa and Fsb, the pulse wave components ACa and ACb correspond to the spectral components Fsah and Fsbh having the maximum power among the spectral components included in the biological spectrum signals Fsa and Fsb. Since the DC components DCa and DCb correspond to the DC spectrum components Fsao and Fsbo having a frequency of “0 Hz”, the following equation (3) is obtained.
SPO2 = f ((Fsbh / Fsbo) / (Fsah / Fsao)) (3)

FIG. 7 is a diagram schematically showing the relationship between the value of {(ACb / DCb) / (ACa / DCa)} in the above equation (2) and the oxygen saturation SpO2.
As shown in FIG.
{(ACb / DCb) / (ACa / DCa)}
And the oxygen saturation SPO2 are approximately proportional.
{(ACb / DCb) / (ACa / DCa)}
The oxygen saturation SPO2 is uniquely specified according to the value of.
Therefore, in this embodiment,
{(ACb / DCb) / (ACa / DCa)}
Value, more specifically,
(Fsbh / Fsbo) / (Fsah / Fsao)
Table data (not shown) indicating the correspondence between the value of the oxygen saturation and the oxygen saturation SPO2 is stored in the ROM 53 in advance.
If the value of {(ACb / DCb) / (ACa / DCa)} is calculated, the oxygen saturation SPO2 is specified based on the table data.

As a result, it is not necessary to calculate the function expression shown in the above expression (2) or (3), so that the oxygen saturation SPO2 can be quickly identified, and the power consumption by this calculation can be reduced. Become.
The oxygen saturation SPO2 is not obtained from the above equation (3) based on the frequency analysis value, but the AC component (pulse wave amplitude) and the DC component from the biological detection signal waveform (A / D conversion value) from the photodetector 15G. And the oxygen saturation SPO2 may be directly obtained using the above equation (2).
FIG. 8 is a flowchart showing the procedure of the biological information measurement process.
The CPU 51 of the dive computer 10 determines whether or not it is the measurement start timing (step S1).
If it is determined in step S1 that the measurement start timing has not yet been reached, a standby state is entered.

If it is determined in step S1 that the measurement start timing has been reached (step S1: Yes), a control signal is output to the A / D conversion circuit 36 to operate it, and the LED 15F1 of the biosensor unit 15 is operated. , 15F2 and the body motion sensor 140 are operated exclusively (time division), and the biological detection signal based on the light emission of the LED 15F1 and the biological detection signal based on the light emission of the LED 15F2 are transmitted via the amplifier circuit 41, The signal is taken in time division via the amplifier circuit 43 (step S2).
Next, the CPU 51 performs FFT processing on each of the living body detection signal and the body motion signal, and calculates each of the biological spectrum signals Fsa and Fsb and the body motion spectrum signal Ft (step S3). Then, the CPU 51 subtracts the body motion spectrum signal Ft from each of the biological spectrum signals Fsa and Fsb in order to remove the body motion component from the biological spectrum signals Fsa and Fsb (step S4), and the subtracted biological spectrum signal Fsa. Based on Fsb, the oxygen saturation and the pulse rate (that is, biological information) are calculated (step S5).
FIG. 9 is a flowchart showing the procedure of the biological information calculation process.
First, the CPU 51 separates the biological spectrum signals Fsa and Fsb into DC spectral components Fsao and Fsbo and spectral components Fsah and Fsbh having the maximum power in order to obtain the oxygen saturation SPO2 using the above equation (3). (Step S50).
Next, from these spectral components Fsao, Fsbo, Fsah, Fsbh,
(Fsbh / Fsbo) / (Fsah / Fsao)
, That is, the absorbance ratio of each of the two wavelengths is calculated (step S51).

Then, the CPU 51 specifies the oxygen saturation SPO2 corresponding to the calculated absorbance ratio with reference to the table data stored in the ROM 53 (step S52). Here, the oxygen saturation SPO2 is obtained from the above equation (3) based on the frequency analysis value. However, the present invention is not limited thereto. The component (pulse wave amplitude) and the DC component may be obtained, and the oxygen saturation SPO2 may be directly obtained using the above equation (2).
Next, the CPU 51 calculates the pulse rate by the following equation (4) using the fact that the frequency of the spectrum components Fsah and Fsbh having the maximum power among the biological spectrum signals Fsa and Fsb indicates the pulse (step S53).
Pulse rate (beats / minute)
= Frequency of power maximum component Fsah of biological spectrum signal × 60 (4)
Or
Pulse rate (beats / minute)
= Frequency of power maximum component Fsbh of biological spectrum signal × 60 (4 ')

Note that the pulse rate can be calculated by using any of the biological spectrum signals Fsa and Fsb obtained corresponding to each of the LEDs 15F1 and 15F2. Accordingly, the pulse rate may be calculated using any one of the biological spectrum signals, and the average value of the pulse rates calculated for each of the biological spectrum signals Fsa and Fsb is calculated in order to reduce the error. You may do it.
Returning to FIG. 8 again, the CPU 51 displays the oxygen saturation and the pulse rate calculated in step S5 on the liquid crystal display unit 108 (step S6), and notifies the diver of the measurement result. And CPU51 discriminate | determines whether there existed the instruction | indication which complete | finishes biometric information measurement by operation of the operation part 102 of a diver, such as a change of operation mode (step S7), and if this discrimination | determination result is No (step S7; No), in order to continue biometric information measurement, the process again proceeds to step S2.
Moreover, in the determination of step S7, when the determination result is Yes (step S7; Yes), the CPU 51 ends the biological information measurement process.
In the biometric information calculation process described above, the biometric information is calculated in the order of oxygen saturation and pulse rate. However, it is needless to say that the configuration may be such that the pulse rate and oxygen saturation are calculated in this order.
Next, a method for calculating the nitrogen partial pressure in the body will be described.

FIG. 10 is a functional block diagram for calculating the nitrogen partial pressure (internal inert gas amount) in the dive computer according to the present embodiment.
As shown in FIG. 10, the divers information processing apparatus 1 includes the pressure measuring unit 61, the respiratory nitrogen partial pressure calculating unit 62, the respiratory nitrogen partial pressure storage unit 63, the body nitrogen partial pressure calculating unit 64, and the body nitrogen content. A pressure storage unit 65, a comparison unit 66, a half-saturation time selection unit 67, and a timer unit 68 are provided. The comparison unit 66 compares data stored in the respiratory nitrogen partial pressure storage unit 63 and the in-vivo nitrogen partial pressure storage unit 65. These respiratory air nitrogen partial pressure calculation unit 62, respiratory air nitrogen partial pressure storage unit 63, internal nitrogen partial pressure calculation unit 64, internal nitrogen partial pressure storage unit 65, comparison unit 66, and half-saturation time selection unit 67 are shown in FIG. It can be realized by software executed by the CPU 51, the ROM 53, and the RAM 54 shown. However, the present invention is not limited to this, and it can be realized by combining only a logic circuit that is hardware, or a combination of a logic circuit, a processing circuit including a CPU, and software.

A method for calculating the nitrogen partial pressure in the body will be described. Regarding the calculation method of the in-vivo nitrogen partial pressure performed in the information processing apparatus for divers 1 of the present embodiment, for example, “DIVE COMPUTER A CONSUMER'S GUIDE TO HISTORY, THEORY & PERFORMANCE” by Watersport Publishing Inc. (1991) by KEN LOYST et al. AABuhlmann, “Decompression-Decompression Sickness” (especially page 14), Springer, Berlin (1984). The calculation of the in-vivo nitrogen partial pressure shown here is merely an example, and various other methods can be used.
In this configuration, the CPU 51 calculates the water pressure P (t) corresponding to the time t based on the water pressure measured by the pressure measuring unit 61 and the time measured by the time measuring unit 68 and outputs the value. Here, P (t) means absolute pressure including atmospheric pressure. The respiratory air nitrogen partial pressure calculation unit 62 calculates the nitrogen partial pressure in the air that the diver is breathing based on the output water pressure P (t) (hereinafter referred to as respiratory air nitrogen partial pressure PIN2 (t)). And output the value. Here, the respiratory nitrogen partial pressure PIN2 (t) is calculated by the following equation using the water pressure P (t).
PIN2 (t) = 0.79 × P (t) [bar]

In the above formula, “0.79” is a numerical value indicating the ratio of nitrogen in the air. The respiratory air nitrogen partial pressure storage unit 63 stores the value of the respiratory air nitrogen partial pressure PIN2 (t) calculated by the respiratory air nitrogen partial pressure calculation unit 62 as shown in the above equation.
The body nitrogen partial pressure calculation unit 64 calculates the body nitrogen partial pressure PGT (t) for each body tissue having different nitrogen absorption / extraction rates. For example, taking one tissue as an example, the in-vivo nitrogen partial pressure PGT (tE) to be absorbed / exhausted by the diving time t = t0 to tE is the in-body nitrogen partial pressure PGT (t0) at the start of calculation (at t0). , And is stored in the body nitrogen partial pressure storage unit 65.
PGT (tE) = PGT (t0)
+ {PIN2 (t0) -PGT (t0)}
X {1-exp (-k (tE-t0) / TH)}
Here, k is a constant obtained experimentally, and TH is the time required for nitrogen to dissolve in each tissue and reach half of the saturated state (hereinafter referred to as half-saturation time), and is a numerical value that varies depending on each tissue. .
As will be described later, the half-saturation time TH is variable according to the magnitudes of the body nitrogen partial pressure PGT (t0) and the respiratory nitrogen partial pressure PIN2 (t0). Note that time such as time t0 and time tE is measured by the time measuring unit 68 shown in FIG.

For example, the respiratory air nitrogen partial pressure PIN2 (t0) and the body nitrogen partial pressure PGT (t0) at t = t0 are stored in the respiratory air nitrogen partial pressure storage unit 63 and the body nitrogen partial pressure storage unit 65, respectively. The comparison unit 66 compares PIN2 (t0) with PGT (t0). Based on the result of comparison in the comparison unit 66, the nitrogen partial pressure calculation unit 64 in the body calculates the partial nitrogen pressure PGT (tE) in the body when t = tE by the half-saturation time selection unit 67 based on the following equation. .
(1) When PGT (t0)> PIN2 (t0) PGT (tE) = PGT (t0)
+ {PIN2 (t0) -PGT (t0)}
X {1-exp (-k (tE-t0) / THl)}
(2) When PGT (t0) <PIN2 (t0) PGT (tE) = PGT (t0)
+ {PIN2 (t0) -PGT (t0)}
X {1-exp (-k (tE-t0) / TH2)}
Here, k is a constant, and TH2 <TH1.
When PGT (t0) = PIN2 (t0), it is desirable to calculate as half saturation time TH = (TH2 + THl) / 2.

Here, the reason why the half-saturation time TH differs between when PGT (t0)> PIN2 (t0) and when PGT (t0) <PIN2 (t0) will be described.
First, when PGT (t0)> PIN2 (t0), nitrogen is discharged from the body, and conversely, when PGT (t0) <PIN2 (t0), nitrogen is absorbed into the body. is there. That is, in order to calculate that the discharge of nitrogen takes longer than the absorption of nitrogen, the half-saturation time TH1 when nitrogen is discharged is set longer than the half-saturation time TH2 when nitrogen is absorbed. is there. In this way, the simulation of the amount of nitrogen in the body can be performed more strictly by using different half-saturation times TH for nitrogen discharge and absorption. Also, if you set the upper limit of nitrogen partial pressure in the body, you can dive without decompression from the current partial pressure of nitrogen in the body or the time it takes for the partial pressure of nitrogen in the body to return to normal after reaching the water surface. Can be requested. Therefore, if the information on the nitrogen partial pressure in the body is notified to the diver, the safety of diving can be improved.

Next, the operation of the dive computer having the above configuration will be described.
FIG. 11 is a diagram schematically showing display screen transition in various operation modes of the dive computer 10.
As shown in FIG. 11, the operation modes of the dive computer 10 include a time mode ST1, a surface mode ST2, a planning mode ST3, a setting mode ST4, a diving mode ST5, a log mode ST6, and a notification condition setting mode ST7. FIG. 5 shows only items displayed in the display area 11 </ b> A in the display area of the liquid crystal display panel 11.
Various operation modes will be described below. Note that the processing in these various operation modes is executed by the control unit 50 described above.

(Time mode STl)
The time mode STl is an operation mode when the switch operation is not performed and the resting nitrogen is in an equilibrium state and is carried on land. In this time mode ST1, the liquid crystal display panel 101 displays the current date in the first display area 111 (= current month display area) and the second display area 112 (= current time display area). The current time is displayed, and the altitude rank is displayed on the altitude rank display portion 115B of the fifth display area 115.
Here, the altitude rank automatically measures the altitude of the current location, classifies the altitude into four altitude ranges (= altitude rank = rank 0 to rank 3), and excludes altitude rank = rank 0. Three ranks are displayed. That is, when the altitude rank is rank 0, no mark is displayed on the altitude rank display portion 115B.

The relationship between altitude rank, barometric pressure and altitude is as follows.

Altitude Rank Pressure (msw) Altitude
0 10.0 0-800m
1 9.3 800-1600m
2 8.4 1600-2000m
3 7.5 2000m-

When displaying the current time, the colon (:) blinks to indicate that this display is the current time. For example, in the state shown in the time mode ST1, it is displayed that the current time is 10:06 on December 5th.

In addition, the air pressure changes when you move from high to low above sea level, and nitrogen melts into and discharges from the body regardless of whether you have dived in the past. Therefore, in the dive computer 10 of the present embodiment, even when the time mode ST1 is used, when such an altitude change occurs, the decompression calculation is automatically started and the display changes. That is, although illustration is omitted, the time after the altitude changes, the time until the partial pressure of nitrogen in the body reaches an equilibrium state, and the amount of nitrogen discharged or dissolved from the present to the equilibrium state are displayed. In addition, even if there is no actual change in altitude, the decompression calculation is performed even if the atmospheric pressure information set by the condition setting means is used before moving with a decrease in atmospheric pressure.
In this time mode ST1, when the switch A is pressed, the mode is shifted to the planning mode ST3. Further, when the switch B is pressed, the log mode ST6 is entered. Further, when the switch B is kept pressed for a certain period, for example, 5 seconds while the switch A is being pressed, the mode is shifted to the setting mode ST4.

(Surface mode ST2)
The surface mode ST2 is an operation mode for carrying on land until 48 hours have passed since the last dive. When the diving operation monitoring switch 30 that has been conducted after the last dive is ended, the surface mode ST2 is automatically activated. The mode is shifted to the surface mode ST2. In this surface mode ST2, as shown in FIG. 11, the current month and day are displayed in the first display area 111 (= current month and day display area), and the second display area 112 (= current time display area). The current time is displayed, the altitude rank is displayed on the altitude rank display portion 115B of the fifth display area 115, and the third display area 113 (= the body nitrogen discharge time display area) has melted into the body. The time until the excess nitrogen is discharged and the state of equilibrium is reached is displayed. The fourth display area 114 (= water surface pause time display area) displays the elapsed time after diving, and the sixth display area 116. In the (= internal nitrogen graph display area), the partial pressure of nitrogen dissolved in the body is displayed as an in-vivo nitrogen graph. The time until the equilibrium state displayed in the third display area 113 (= internal nitrogen discharge time display area) is counted down. When this time reaches 0:00, no display is made thereafter.

Further, in the surface mode ST2, the water surface pause time displayed in the fourth display area 114 (= water surface pause time display area) is the diving time when the water depth becomes shallower than 1.5 m in the diving mode ST5 described later. Time measurement is started as the end of, and after measuring up to 48 hours, there is no display. Accordingly, in the dive computer 10, the surface mode ST2 is set on land until 48 hours have elapsed after the diving is completed, and thereafter, the time mode ST1 is set. Note that the surface mode ST2 shown in FIG. 11 is currently 11:58 on December 5, and it is displayed that 1 hour and 13 minutes have elapsed since the end of diving. In addition, the partial pressure of nitrogen dissolved in the body by the diving performed so far corresponds to 4 in the body nitrogen graph, and the time from this state to the excess nitrogen being exhausted to the equilibrium state (internal nitrogen) Discharge time) is displayed as 10 hours 55 minutes.
In the surface mode ST2, when the switch A is pressed, the mode is shifted to the planning mode ST3. Further, when the switch B is pressed, the log mode ST6 is entered. Further, when the switch B is kept pressed for a certain period, for example, 5 seconds while the switch A is being pressed, the mode is shifted to the setting mode ST4.

(Planning mode ST3)
The planning mode ST3 is an operation mode in which the maximum depth of diving to be performed next and an indication of the diving time can be input. In this operation mode, as shown in FIG. 11, the first display area 111 (= water depth rank display area) displays a water depth rank, which will be described later, and the second display area 112 (= no decompression diving possible time display area). ) Displays a no-decompression dive time corresponding to the water depth rank, and displays a water surface pause time in the fourth display area 114 (= water surface pause time display area) and a sixth display area 116 (= In the body nitrogen graph display area), the body nitrogen partial pressure dissolved in the body is displayed as a body nitrogen graph, and a safety bell (not shown) and an altitude rank (not shown) are displayed.
In the planning mode ST3, the display of the water depth rank in the water depth rank display area 301 is sequentially changed from the low rank to the high rank. The depth ranks are 9m, 12m, 15m, 18m, 21m, 24m, 27m, 30m, 33m, 36m, 39m, 42m, 45m, and 48m, and this display is sequentially switched every 5 seconds. At this time, if the mode is shifted from the time mode ST1 to the planning mode ST3, the plan is a first-time diving in which there is no excessive nitrogen accumulation in the body due to past diving, so as shown in the upper diagram of FIG. Becomes 0, and when the water depth is 15 m, the non-decompressible dive possible time is displayed as 66 minutes. This indicates that decompression diving is possible up to less than 66 minutes at a water depth of 12 m or more and 15 m or less.

On the other hand, if the mode is shifted from the surface mode ST2 to the planning mode ST3, the plan is a repetitive diving plan in which excessive nitrogen accumulation occurs in the body due to past diving. When the partial pressure corresponds to 4 in the body nitrogen graph and the maximum water depth is 15 m, the no-decompression dive possible time is displayed as 45 minutes. This indicates that no decompression diving is possible up to less than 45 minutes at a water depth of 12 m or more and 15 m or less.
In the planning mode ST3, if the switch A is kept pressed for a certain period, for example, 2 seconds or more while the water depth rank is sequentially displayed from 9 m to 48 m, the mode is shifted to the surface mode ST2. In the planning mode ST3, after the water depth rank is displayed as 48 m, the mode is automatically shifted to the time mode ST1 or the surface mode ST2. Further, in the planning mode ST3, when there is no switch operation for a predetermined period, the mode automatically shifts to the surface mode ST2 or the time mode ST1, so that it is not necessary to perform the switch operation each time, which is convenient for divers. Further, when the switch B is pressed, the log mode ST6 is entered.

(Setting mode ST4)
In the setting mode ST4, as shown in FIG. 8, the current date is displayed in the first display area 111 (= current month / day display area), and the second display area 112 (= current time display area) is displayed. The current time is displayed, and the fourth display area 114 (= year display area) displays the current year in the Western calendar, and a safety level (not shown) and alarm ON / OFF (not shown). ) Is displayed. The setting mode ST4 is an operation mode for performing ON / OFF setting of a warning alarm and setting of a safety level in addition to the setting of the current date and time.
Among these setting items, the safety level is set to two levels: a level for performing normal decompression calculation, and a level for performing decompression calculation based on the assumption that the vehicle moves to a higher-ranked place after diving. can do. The alarm ON / OFF is a function for setting whether or not various warning alarms are sounded from the sound report device 37. If the alarm is set to OFF, the alarm will not sound. This is because an apparatus that is particularly fatal, such as the information processing apparatus 1 for divers, can avoid power consumption due to an alarm and inadvertent battery exhaustion, which is convenient.
In this setting mode ST4, each time the switch A is pressed, the setting item is switched in the order of hour, second, minute, year, month, day, safety level, alarm ON / OFF, and the display of the setting target portion flashes. At this time, when the switch B is pressed, the numerical value or character of the setting item is changed, and when the switch B is continuously pressed, the numerical value or character is quickly changed. When the switch A is pressed while the alarm ON / OFF is blinking, the mode returns to the surface mode ST2 or the time mode ST1. Further, if neither of the switches A and B is operated for a predetermined period, for example, 1 minute to 2 minutes, the mode automatically returns to the surface mode ST2 or the time mode STl. Furthermore, if the switch B is kept pressed for a certain period of time, for example, 5 seconds while the switch A is being pressed, the notification condition setting mode ST7 is entered.

(Diving mode ST5)
The diving mode ST5 is an operation mode at the time of diving, and includes a no-decompression diving mode ST51, a biological information display mode ST52, and a decompression diving display mode ST53.
In the state of the diving mode ST5, when the water surface ascends to a depth shallower than 1.5 m, it is considered that the diving has been completed, and the diving operation monitoring switch 30 that has been in a conductive state due to diving is in the green state. At that time, the mode automatically shifts to the surface mode ST2. In this case, the CPU 51 sets the diving operation (diving date, diving time, maximum) from the time when the water depth becomes 1.5 m or more to the time when the water depth becomes less than 1.5 m as one diving operation. (Various data such as water depth) is stored and held in the RAM 54. At the same time, when the above ascending speed violation warning is continuously performed twice or more during the current diving, the CPU 51 also records and holds that fact in the diving result.
The information processing apparatus 1 for divers according to the present embodiment is configured on the premise of non-decompression diving, but in the unlikely event that decompression diving needs to be performed, an alarm sound to that effect is notified to the diver. At the same time, the process proceeds to a decompression diving display mode ST53 described later.

In the decompression diving display mode ST53, as shown in FIG. 11, the current water depth is displayed in the first display area 111 (= current water depth display area), and the second display area 112 (= diving time display area). Shows the elapsed time since the start of diving. In the sixth display area 116 (= internal nitrogen graph display area), the partial pressure of nitrogen dissolved in the body is displayed as an internal nitrogen graph. In the display area 113 (= decompression stop depth display area), the water depth (decompression stop depth) to be surfaced during decompression diving is displayed, and a fourth display area 114 (= decompression stop time display area and total ascent time display area) ) Displays the time to stop at the decompression stop depth and the minimum safe time until the water reaches the surface during decompression diving, and the altitude rank (not shown) is displayed.
In the decompression diving display mode ST53 shown in FIG. 11, it is displayed that 24 minutes have elapsed since the start of diving and the current water depth is 29.5 m. Moreover, in the decompression diving display mode ST53, since the partial pressure of nitrogen in the body is dangerous and exceeds the maximum allowable value, the surface ascends to a depth of 3 m while maintaining a safe ascent rate, and then the decompression is stopped for 1 minute, An instruction to allow at least 5 minutes to reach the water surface as the ascent rate is displayed, and further, for example, a seventh display on the liquid crystal display panel 101 indicates that the current partial pressure of nitrogen in the body is increasing. The area 117 is indicated by an upward arrow. In such a case, the diver floats after stopping the decompression based on the display content. In the decompression diving display mode ST53, the fact that the partial pressure of nitrogen in the body in a state where decompression is stopped tends to decrease is displayed by, for example, a downward arrow in the seventh display region 117 of the liquid crystal display panel 101.

In the no-decompression diving mode ST51, as shown in FIG. 11, the current water depth is displayed in the first display area 111 (= current water depth display area), and the second display area 112 (= diving time display area). Shows the elapsed time since the start of diving, the third display area 113 (= maximum water depth display area) displays the maximum water depth in the current diving, and the fourth display area 114 (= In the no-decompression diving possible time display area), the no-decompression diving possible time at the current depth is displayed. In the sixth display area 116 (= in-body nitrogen graph display area), the partial pressure of the body nitrogen dissolved in the body is displayed. This is an operation mode in which information necessary for diving, such as altitude rank (not shown), is displayed as a body nitrogen graph.
In the no-decompression diving mode ST51 shown in FIG. 11, 12 minutes have passed since the start of diving, and the current water depth is 16.8 m. At this depth, it is displayed that no decompression diving for another 42 minutes can be continued. Has been. Further, it is displayed that the maximum water depth in the current diving is 20.0 m, and further that the current nitrogen partial pressure in the body corresponds to four marks in the body nitrogen graph.

  In the diving mode ST5, since the rapid ascent causes decompression sickness, the above-described ascent speed monitoring function works. The ascent speed monitoring function calculates the current ascent speed every predetermined time, for example, every 6 seconds, and compares the calculated ascent speed with the ascent speed upper limit value corresponding to the current water depth. When it is faster than the upper limit of the ascent speed, the alarm sound (alarm speed violation warning) is emitted from the sounding device 37 at a frequency of 4 kHz for a certain period, for example, 3 seconds, and the liquid crystal display panel 11 is set so as to reduce the ascent speed. In the seventh display area 117, the display of “SLOW” and the display of the current water depth are alternately blinked at a cycle of 1 Hz to issue an ascent speed violation warning, and the vibration generator 38 vibrates that the ascent speed is violated. To warn the diver. When the ascent speed calculated by the ascent speed monitoring function decreases to a normal level, the ascent speed warning is stopped.

In the diving mode ST5, when the switch A is pressed, the process proceeds to the biological information display mode ST52 according to the present invention.
FIG. 12 is an explanatory diagram illustrating an example of a display screen in the biological information display mode.
In the biometric information display mode ST52, as shown in FIG. 12, in the second display area 112 (= oxygen saturation display area), “SPO2” indicating that the oxygen saturation is indicating oxygen saturation is displayed. The heart rate of the diver is displayed in the fourth display area 114 (= heart rate display area), and the pulse is displayed in the sixth display area 116 (= pulse graph display area). “PULSE METER” indicating the effect and the pulse state are displayed as a pulse graph.
In the biological information display mode ST52 shown in FIG. 12, it is displayed that the oxygen saturation SPO2 is 96%.
The pulse rate is 63 (beats / minute), and the pulse state is displayed as a dynamic graph. Since the pulse state is displayed as a dynamic graph in this way, the diver can easily grasp that the biosensor unit 15 is operating normally, and compared with the case where only the numbers are displayed. And intuitively know whether the pulse rate is fast or slow.
Furthermore, the mental state during diving can be estimated to some extent from the pulse rate (if the pulse rate is high, the subject is in an excited state, etc.), and safety management in diving can be performed.

(Log mode ST6)
Transition to the log mode ST6 can be made by pressing the switch B in the operation mode state of the time mode ST1 or the surface mode ST2. This log mode ST6 is an operation mode for storing and displaying various data when diving deeper than a water depth of 1.5 m in the operation mode state of the diving mode ST5 and when the diving time is 3 minutes or more. Such diving data is sequentially stored as log data for each diving, and a predetermined number, for example, a maximum of 10 log data is stored and held. Here, when diving more than the maximum storage number is performed, the oldest data is deleted in order, and the latest 10 pieces of diving data are always stored and held.
In the log mode ST6, the log data is displayed on two screens that switch every 4 seconds. In the log mode ST6, as shown in FIG. 11, on the first screen ST61, the first display area 111 (= diving month / day display area) displays the date of diving, and the third In the display area 113 (= average water depth display area), the average water depth in this diving is displayed, and in the second display area 112 (= diving start time display area), the time when the diving is started is displayed. In the display area 114 (= diver diving end time display area), the time when the diving is finished is displayed, and in the sixth display area 116 (= in-body nitrogen graph display area), the body when the diving is finished is displayed. The partial pressure of nitrogen dissolved in the body is displayed as a body nitrogen graph, and an altitude rank (not shown) is displayed.

In addition, on the second screen ST62, the first display area 111 (= log number display area) displays a log number that is a diving number on the day of the diving, and a third display area 113 (= In the maximum water depth display area), the maximum water depth in this diving is displayed, and in the second display area 112 (= diving time display area), the time during which diving was performed is displayed, and the fourth display area 114 is displayed. (= Water temperature display area) displays the water temperature at the maximum depth, and the sixth display area 116 (= internal nitrogen graph display area) shows the partial pressure of nitrogen dissolved in the body when diving is finished. It is displayed as a body nitrogen graph, and an altitude rank (not shown) is displayed.
For example, in the state shown in FIG. 11, when the altitude rank is 0, the diving is for two days on December 5th, the dive start is 10:07, the dive end is 10:45, and the dive time is Is displayed for 38 minutes. In this diving, the average water depth is 14.6 m, the maximum water depth is 26.0 m, the water temperature at the maximum water depth is 23 ° C., and the partial pressure of nitrogen in the body after diving is marked 4 in the body nitrogen graph. A message corresponding to the number is displayed. In this way, in the log mode ST6, various information is displayed while automatically switching between the two screens, so that a large amount of information can be displayed even if the display surface is small.
Further, in the log mode ST6, when there are two or more speed violation warnings during diving corresponding to the currently displayed log data, for example, in the seventh display area 117 of the liquid crystal display panel 11, “ “SLOW” is displayed.

  In this log mode ST6, every time the switch B is pressed, the new data is sequentially switched to the old data, and after the oldest data is displayed, the mode is shifted to the time mode ST1 or the surface mode ST2. Even when the switch B is continuously pressed for 2 seconds or more during the switching of the log, the mode shifts to the time mode ST1 or the surface mode ST2. Furthermore, even when neither of the switches A and B is pressed for a predetermined time, for example, 1 minute to 2 minutes, the mode automatically shifts to the time mode ST1 or the surface mode ST2. Therefore, it is not necessary for the diver to perform a switch operation, and usability is improved. Further, when the switch A is pressed, the mode shifts to the planning mode ST3.

Here, warning processing based on biological information will be described.
Oxygen deficiency can occur especially during trimix diving. As described above, the trimix diving is usually a diving based on the premise of diving at a deep depth and diving under reduced pressure, and therefore a plurality of gases are used. The types of gases are classified according to purposes as follows.
(1) Normal compressed air (air) for diving
(2) A diving gas in which the oxygen ratio is set lower than the oxygen ratio in normal compressed air in order to reduce the risk of oxygen poisoning at a deep depth. (3) From the oxygen ratio in normal compressed air used for decompression diving. Also, the diving gas with a high oxygen ratio is set, and the above three types of gases are used in appropriate combination according to the diving pattern.
In this case, there is no problem when the above three types of gases are used in accordance with the original use mode, but there is a risk of oxygen poisoning and oxygen deficiency when used in the wrong use mode. It will be.

For example, if a gas having a low oxygen concentration for large depths is breathed in a shallow water depth area immediately after the start of submersion, there is a risk of oxygen deficiency.
As a specific example, a mixed gas having a low oxygen concentration for large depths of helium concentration FHe = 40%, oxygen concentration FO2 = 12%, nitrogen concentration FN2 = 48% is 0 m altitude, immediately after the start of diving (for example, near a water depth of 3 m). Oxygen partial pressure PO2 when used in
PO2 = (10 + 3) * 0.12 / 10
= 0.156 (atm)
Thus, it becomes lower than 0.16 atm, which is usually referred to as a boundary value of oxygen deficiency, and it can be a very dangerous state from the viewpoint of oxygen deficiency.

Further, when a gas with a high oxygen concentration for decompression is breathed in a deep area, there is a risk of oxygen poisoning.
As a specific example, when a gas mixture of high oxygen concentration for decompression diving with helium concentration FHe = 0%, oxygen concentration FO2 = 80%, nitrogen concentration FN2 = 20% is used at an altitude of 0 m and a water depth of 60 m, the oxygen partial pressure PO2 is
PO2 = (10 + 60) x 0.8 / 10
= 5.6 (atm)
Thus, it greatly exceeds 1.8 atm, which is usually referred to as a boundary value for central nervous system oxygen poisoning, and can be extremely dangerous from the viewpoint of oxygen poisoning.
Therefore, in the present embodiment, as described above, when it is determined that there is a risk of oxygen deficiency or oxygen poisoning, a warning is given to prompt the diver (user) to take countermeasures. Yes.

FIG. 13 is a process flowchart of the warning process.
First, the CPU 51 calculates the current oxygen partial pressure PO2 (step S71).
Specifically, the oxygen partial pressure PO2 is calculated by the following equation based on the ambient pressure PP (= water pressure + atmospheric pressure) detected by the pressure sensor 34 and the oxygen concentration FO2 in the mixed gas supplied from the cylinder.
PO2 = PP ・ FO2
Next, the CPU 51 determines whether or not there is a possibility of oxygen poisoning based on the calculated oxygen partial pressure PO2 (step S72).

Specifically, the current oxygen partial pressure PO2 calculated in step S71 is
PO2 <0.5
If the condition is satisfied, it is determined that there is no possibility of oxygen poisoning.
In step S72, if there is no possibility of oxygen poisoning, that is,
PO2 <0.5
If it is (step S72; Yes), the process proceeds to step S76.
In step S72, if there is a possibility of oxygen poisoning, that is,
PO2 ≧ 0.5
(Step S72; No), the CPU 51 supplies power to the biosensor unit 15, and the current oxygen saturation SPO2 having a correlation with the actual blood dissolved oxygen amount of the diver is obtained by the method described above. Obtain (calculate) (step S73).
The reason why the oxygen saturation SPO2 is measured only when there is a possibility of oxygen poisoning is to prevent an increase in power consumption if the measurement is always performed.
Then, the CPU 51 determines whether or not there is a possibility of oxygen poisoning based on the acquired oxygen saturation SPO2 (step S74).

Specifically, in step S74, the determination is performed by any of the following.
(1) The current oxygen saturation SPO2 acquired in step S73 is
SPO2> 98 [%]
If the condition is satisfied, it is determined that there is a possibility of oxygen poisoning.
(2) If the current oxygen saturation SPO2 obtained by adding a predetermined safety factor to the average oxygen saturation SPO2 AVE on land for the diver exceeds the current oxygen saturation SPO2, it is determined that there is a possibility of oxygen poisoning . For example,
SPO2> SPO2 AVE + 0.2 [%]
If the condition is satisfied, it is determined that there is a possibility of oxygen poisoning.
If it is determined in step S74 that there is a possibility of oxygen poisoning based on the acquired oxygen saturation SPO2 (step S74; Yes), the process proceeds to a warning process (step S79) to be described later. Perform the corresponding warning process.
If it is determined in step S74 that there is no possibility of oxygen poisoning based on the acquired oxygen saturation SPO2, the CPU 51 reconfirms safety based on the conventional method in order to ensure safety. This is performed (step S75).

Specifically, the CPU 51 performs calculation using a conventional arithmetic expression for systemic poisoning, and determines whether or not the degree of risk exceeds 80%.
If it is determined in step S75 that the risk of causing systemic poisoning is high based on the conventional method (step S75; Yes), the process proceeds to a warning process (step S79) described later, and oxygen poisoning is caused. Perform the corresponding warning process.
If it is determined in step S75 that the risk of causing systemic poisoning is low based on the conventional method (step S75; No), the CPU 51 determines hypoxia based on the acquired oxygen saturation SPO2. It is determined whether or not there is a possibility of (hypoxia) (step S76).
Specifically, in step S76, the determination is performed by any of the following.
(1) The current oxygen saturation SPO2 acquired in step S73 is
SPO2 <90 [%]
If the condition is satisfied, it is determined that there is a possibility of hypoxia.
(2) If the current oxygen saturation SPO2 acquired from a value obtained by subtracting a predetermined safety coefficient from the average oxygen saturation SPO2 AVE on land for the diver is small, it is determined that there is a possibility of hypoxia. For example,
SPO2 <SPO2 AVE-0.6 [%]
If the condition is satisfied, it is determined that there is a possibility of hypoxia.

If it is determined in step S76 that there is a possibility of hypoxia based on the acquired oxygen saturation SPO2 (step S76; Yes), the process proceeds to a warning process (step S79) to be described later. The warning processing corresponding to the disease is performed.
If it is determined in step S76 that there is no possibility of hypoxia based on the acquired oxygen saturation SPO2, the CPU 51 calculates the pulse rate by the method described above based on the output of the biosensor unit 15. Measurement is performed (step S77).
Next, the CPU 51 determines whether or not the measured pulse rate is abnormal (step S78).
Specifically, if the pulse rate exceeds 100 (beats / minute), it is determined as abnormal.
If it is determined in step S78 that there is no abnormality in the measured pulse rate (step S78; No), the warning process is terminated.
If it is determined in step S78 that the measured pulse rate is abnormal (step S78; Yes), the process proceeds to a warning process (step S79) described later, and a warning process corresponding to the pulse rate abnormality is performed.

Here, specific warning processing will be described.
If it is determined that there is oxygen poisoning, hypoxia, or abnormal pulse, warning processing is performed to blink the display on the liquid crystal display panel 101 or sound an alarm (step S79).
Specifically, the oxygen saturation SPO2 display is blinked, the pulse rate display is blinked, the entire screen is blinked, the sounding device 37 is activated, and the vibration generator 38 is driven. Vibrate.
Here, specific examples of the sound reporting device and the vibration generating device will be described.
FIG. 14 is a circuit configuration diagram of an alarm sound generating circuit in the sound reporting device 37.
As shown in FIG. 14, in the alarm sound generating circuit, a coil 371 and a piezoelectric element buzzer 372 are connected in series, an IC 373 is connected in parallel with the coil 371, and a diode 375 is provided between the IC 373 and the piezoelectric element buzzer 372. And a transistor 374 are sequentially connected. The voltage is boosted by the on / off timing of the transistor 374, and the boosted voltage is applied to the piezoelectric element buzzer 372, so that the piezoelectric element buzzer 372 sounds an alarm.

FIG. 15 is an explanatory diagram of a drive circuit of the vibration generator.
As shown in FIG. 15, the drive circuit of the vibration alarm step motor of the vibration generator 38 is configured by connecting a CPU 51, a steering wheel 386, a motor driver 388, a drive coil 381, and a vibration alarm step motor 390 in this order. ing. When the CPU 51 generates a drive pulse Pl and the drive pulse Pl signal is input to the steering 386, the control signals C1 to C4 change as described later, and the control signal is input to the motor driver 388. The motor driver 388 includes PMOS transistors Trl and Tr4 and NMOS transistors Tr2 and Tr3. Control signals Cl and C4 of the steering 386 are input to the gates of the PMOS transistors Tr1 and Tr4, and control signals C2 and C3 of the steering 386 are input to the gates of the NMOS transistors Tr2 and Tr3.

  One of the drive coils 381 is connected to the drains of the PMOS transistor Tr1 and the NMOS transistor Tr2 of the motor driver 388, and the other is connected to the drains of the NMOS transistor Tr3 and the PMOS transistor Tr4 of the motor driver 388. The vibration alarm step motor 390 is surrounded by a U-shaped magnetic core 387 around which a single-phase drive coil 381 is wound, stators 382a and 382b connected to both ends of the magnetic core 387, and the stators 382a and 382b. And a rotor 385 arranged in such a manner. The rotor 385 is provided with a rotating shaft 383, and a permanent magnet 389 and an eccentric weight 384 are attached on the same axis as the rotating shaft 383. The permanent magnet 389 is magnetized in two poles, and is mainly made of a samarium cobalt-based material. The eccentric weight 384 is made of heavy metal such as gold or tungsten alloy.

  The rotor 385 is disposed so as to be surrounded by two pieces of the stator 382a and the stator 382b. The two pieces of stators 382a and 382b are opposed to each other at eccentric positions as shown in FIG. 15 which is an enlarged view of the stator. The two pieces of the stator 382a and the stator 382b are fixed by screws 380 so as to form a magnetic circuit with the magnetic core 387. The stator 382a, the stator 382b, and the magnetic core 387 are desirably made of a high magnetic permeability member, for example, a permalloy material, in order to increase the magnetic permeability.

Next, the operation of the vibration generator will be described.
16 and 17 are explanatory diagrams of the operation of the vibration generator.
First, during a period when the drive pulse Pl is not output from the CPU 51 (Low level), the control signals Cl, C2, C3 and C4 from the steering 386 are all output at the Low level, Tr1 and Tr4 are turned on, and the drive coil 381 is turned on. Is supplied with the Vdd level.
When the driving pulse Pl is output from the CPU 51 (High level), the control signals Cl and C2 and the control signals C3 and C4 of the steering wheel 386 alternately become High level in synchronization with the driving pulse Pl. When the control signal C1 to C4 from the steering 386 is at the low level and the drive pulse Pl is output from the CPU 51, the control signals Cl and C2 are at the high level, the Tr2 and Tr4 are turned on, and the control signals C3 and C4 are at the low level. It becomes level and Tr1 and Tr3 are OFF. Therefore, the current flows from Vdd to Vss through Tr4 and drive coils 381 and Tr2, so that the stator 382 is magnetized and the rotor 385 rotates.

When the next drive pulse Pl is output from the CPU 51 from this state, the control signals C3 and C4 of the steering 386 become High level, and the control signals Cl and C2 become Low level. At this time, Tr2 and Tr4 are turned off, and Tr1 and Tr3 are turned on. Therefore, the current flows from Vdd to Trl and Vss via the drive coils 381 and Tr3, thereby magnetizing the stator 382 in the opposite direction to the previous time, and the rotor 385 of the vibration alarm step motor 390 performs the next rotation.
By repeating the above operation, continuous rotation is performed to generate vibration.
As described above, according to this embodiment, biological information (oxygen saturation) correlated with the amount of dissolved oxygen in the blood of a diver is measured noninvasively, and blood is obtained based on the obtained biological information. A warning is issued when it is estimated that the intermediate dissolved oxygen amount is out of the predetermined safe dissolved oxygen amount range, so that more accurate warning processing can be performed and the safety of the diver can be ensured.

In the above description, the determination of oxygen poisoning and oxygen deficiency is explained for the case of diving, and the altitude rank is used for display. However, the user uses a high altitude area such as alpine (especially altitude rank = rank 3), that is, there is a possibility of oxygen deficiency.
However, it is not preferable for a dive computer, which is a portable information processing device, to always perform arithmetic processing for discrimination of oxygen poisoning or oxygen deficiency.
Therefore, it is determined whether or not the user is located in an area of a predetermined altitude rank. If the user is located in an area where there is a possibility of oxygen deficiency, the current oxygen partial pressure PO2 is calculated and necessary. Accordingly, the user may be warned about the possibility of oxygen deficiency.

Next, a specific method will be described with appropriate reference to FIG.
First, the CPU 51 calculates the current oxygen partial pressure PO2 (step S71).
Specifically, based on the ambient pressure PP {= absolute pressure (atmosphere pressure + water pressure)} detected by the pressure sensor 34 and the oxygen concentration FO2 in the air corresponding to the ambient pressure PP, the oxygen partial pressure PO2 is calculated by the following equation. To do.
PO2 = PP ・ FO2
Next, the CPU 51 replaces the determination in step S72 of FIG. 13 with the altitude rank at which the user is located based on the ambient pressure PP detected by the pressure sensor 34 as the altitude rank where there is a possibility of oxygen deficiency (for example, altitude It is determined whether or not rank = rank 3).
In this determination, if the altitude rank at which the user is located is not an altitude rank that may be oxygen deficient, the warning process is terminated.
On the other hand, when the altitude rank at which the user is located is an altitude rank with a possibility of oxygen deficiency, the CPU 51 determines whether there is a possibility of hypoxia (hypoxia) based on the acquired oxygen saturation SPO2. Is determined (step S76).

Specifically, in step S76, the determination is performed by any of the following.
(1) The current oxygen saturation SPO2 acquired in step S73 is
SPO2 <90 [%]
If the condition is satisfied, it is determined that there is a possibility of hypoxia.
(2) If the current oxygen saturation SPO2 acquired from a value obtained by subtracting a predetermined safety coefficient from the average oxygen saturation SPO2 AVE on land for the diver is small, it is determined that there is a possibility of hypoxia. For example,
SPO2 <SPO2 AVE-0.6 [%]
If the condition is satisfied, it is determined that there is a possibility of hypoxia.

If it is determined in step S76 that there is a possibility of hypoxia based on the acquired oxygen saturation SPO2 (step S76; Yes), the process proceeds to a warning process (step S79) to be described later. The warning processing corresponding to the disease is performed.
If it is determined in step S76 that there is no possibility of hypoxia based on the acquired oxygen saturation SPO2, the processes in steps S77 to S78 described above are performed.
Thus, by combining the discrimination of the altitude rank and the discrimination of hypoxia, it becomes possible to prevent hypoxia even during non-diving.

In the above description, the warning process is to warn the diver, but it may be configured to notify other divers that they are in a warning state by means of ultrasonic waves or the like. It is.
In the above description, it is assumed that the program for performing the various operations described above is stored in the ROM 53 in advance, but a personal computer or server computer (not shown) and the dive computer are connected via a communication cable or a network. In addition, a configuration may be adopted in which various control programs are downloaded from the personal computer or the server computer to the dive computer. It is also possible to read and execute a control program recorded on a magnetic disk such as a hard disk or a flexible disk, an optical disk such as a CD or DVD, or a storage medium such as a semiconductor storage device.

It is a figure which shows the external appearance structure of the dive computer of embodiment with the aspect of the use. It is an external appearance front view of a dive computer main part. It is explanatory drawing of the mounting state of a biosensor unit. It is a figure which shows typically the structure of a biosensor unit. It is a top view of a biosensor unit. It is a general | schematic block diagram of a dive computer. It is a figure which shows typically the relationship between the value of {(ACb / DCb) / (ACa / DCa)}, and oxygen saturation SpO2. It is a flowchart which shows the procedure of a biometric information measurement process. It is a flowchart which shows the procedure of a biometric information calculation process. It is a functional block diagram for calculating in-body nitrogen partial pressure (in-body inert gas amount) in the dive computer of this embodiment. It is a figure which shows typically the transition of the display screen in the various operation modes of a dive computer. It is explanatory drawing of an example of the display screen in biometric information display mode. It is a processing flowchart of warning processing. It is a circuit block diagram of the alarm sound generation circuit in the sound reporting device. It is explanatory drawing of the drive circuit of a vibration generator. It is operation | movement explanatory drawing (the 1) of a vibration generator. It is operation | movement explanatory drawing (the 2) of a vibration generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Dive computer (information processing apparatus for divers), 11 ... Dive computer main body, 12 ... Wristband, 13 ... Connector part, 14 ... Cable, 15 ... Biosensor unit (biological information measuring part), 15A ... Sensor frame, 15B ... back cover, 15C ... glass plate, 15D ... unit body, 15E ... circuit board, 15F1, 15F2 ... LED, 15G ... photo detector, 16 ... sensor fixing band, 39 ... warning part (warning part), 50 ... control part ( (Warning unit), 51 ... CPU (warning unit), 100 ... display unit, 101 ... liquid crystal display panel, 102 ... operation unit, 103 ... diving operation monitoring switch, 103A, 103B ... electrode, 111 ... first display area, 112 ... 2nd display area, 113 ... 3rd display area, 114 ... 4th display area, 115 ... 5th display area, 116 ... 1st Display area, 117 ... seventh of the display area of the.

Claims (20)

A biological information measuring unit that non-invasively and optically measures biological information correlated with the amount of dissolved oxygen in the blood of the diver;
A warning unit that gives a warning when it is estimated that the biological information is out of a predetermined safe dissolved oxygen amount range;
An information processing apparatus for divers, comprising: The information processing apparatus for divers according to claim 1,
The warning unit warns that there is a possibility of oxygen poisoning when it is estimated that the dissolved oxygen amount in the blood exceeds the upper limit dissolved oxygen amount in the safe dissolved oxygen amount range based on the biological information. An information processing apparatus for divers characterized by performing. The information processing apparatus for divers according to claim 2,
An oxygen partial pressure calculating unit that calculates an oxygen partial pressure based on the ambient pressure of the diver and the oxygen concentration in the air supplied to the diver;
When the calculated oxygen partial pressure exceeds a predetermined reference oxygen partial pressure, the warning unit sets the upper limit dissolved oxygen amount in the safe dissolved oxygen amount range based on the biological information. To determine whether it has been exceeded,
An information processing apparatus for divers characterized by the above. In the information processing apparatus for divers in any one of Claims 1 thru | or 3,
The warning unit may cause hypoxia when it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information. An information processing apparatus for divers characterized by performing a warning. In the information processing apparatus for divers in any one of Claims 1 thru | or 3,
An altitude range discriminating unit that discriminates the altitude range where the information processing apparatus for divers is located based on the ambient pressure,
The warning unit, when the altitude range is a predetermined altitude range and the blood dissolved oxygen amount is estimated to be less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information In addition, an information processing device for divers is provided that warns that there is a possibility of hypoxia. In the information processing apparatus for divers according to any one of claims 1 to 5,
The biological information measuring unit measures the oxygen saturation of the diver, and is an information processing apparatus for divers. The information processing apparatus for divers according to claim 6,
The biological information measurement unit includes a first light source that irradiates biological tissue including arterial blood flow with first measurement light having a first wavelength;
A second light source for irradiating a biological tissue including arterial blood flow with a second measurement light having a second wavelength;
A light receiving unit for receiving the first measurement light and the second measurement light after part of the living tissue is absorbed;
A calculation unit that calculates the oxygen saturation based on the absorbance of each of the first measurement light and the second measurement light corresponding to the light receiving state of the light receiving unit;
An information processing apparatus for divers, comprising: The information processing apparatus for divers according to claim 7,
The wavelength of the first measurement light belongs to a wavelength region in which the absorbance of oxyhemoglobin is smaller than the absorbance of reduced hemoglobin in the arterial bloodstream,
The wavelength of the second measurement light belongs to a wavelength region in which the absorbance of oxyhemoglobin is larger than the absorbance of reduced hemoglobin in the arterial bloodstream. The information processing apparatus for divers according to claim 8,
The center wavelength of the first measurement light is about 660 nm,
The center wavelength of the second measurement light is about 470 nm.
An information processing apparatus for divers characterized by the above. In the information processing apparatus for divers according to any one of claims 7 to 9,
The biological information measurement unit includes a body movement measurement unit that detects body movement of the diver,
The calculation unit calculates a pulse rate of the diver based on a light receiving state of the light receiving unit and a detected body movement.
An information processing apparatus for divers characterized by the above. The information processing apparatus for divers according to claim 10,
The information processing apparatus for divers, wherein the warning unit determines whether or not the pulse rate is abnormal, and issues a warning when determining that the pulse rate is abnormal. A biological information measurement process for non-invasively and optically measuring biological information correlated with the amount of dissolved oxygen in the diver's blood;
A warning process for giving a warning when it is estimated that the amount of dissolved oxygen in the blood is out of a predetermined safe dissolved oxygen amount range based on the biological information;
A method for controlling an information processing apparatus for divers, comprising: In the control method of the information processing apparatus for divers according to claim 12,
The warning process warns that there is a possibility of oxygen poisoning when it is estimated that the amount of dissolved oxygen in the blood exceeds the upper limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information. A control method for an information processing apparatus for divers, characterized in that: In the control method of the information processing apparatus for divers according to claim 12 or 13,
The warning process may lead to hypoxia when the amount of dissolved oxygen in the blood is estimated to be less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information. A control method for an information processing apparatus for divers, characterized by warning. In the control method of the information processing apparatus for divers according to any one of claims 12 to 14,
An altitude range discrimination process for discriminating the altitude range where the information processing device for divers is located based on the ambient pressure,
The warning process is performed when the altitude range is a predetermined altitude range and the blood dissolved oxygen amount is estimated to be less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information. In addition, the control method for the information processing apparatus for divers is characterized by giving a warning that there is a possibility of hypoxia. In a control program for causing a computer to control an information processing device for divers,
Non-invasive and optical measurement of biological information correlated with the amount of dissolved oxygen in the diver's blood,
When it is estimated that the amount of dissolved oxygen in the blood is out of a predetermined safe dissolved oxygen amount range based on the biological information, a warning is performed.
A control program characterized by that. The control program according to claim 16, wherein
When it is estimated that the amount of dissolved oxygen in the blood exceeds the upper limit amount of dissolved oxygen in the safe dissolved oxygen amount range based on the biological information, a warning is given that there is a possibility of oxygen poisoning. Control program. The control program according to claim 16 or claim 17,
When it is estimated that the amount of dissolved oxygen in the blood is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information, a warning that there is a possibility of hypoxia is given. A control program characterized by The control program according to any one of claims 16 to 18,
Based on the ambient pressure, the altitude range where the information processing device for divers is located is determined,
When it is estimated that the altitude range is a predetermined altitude range and the blood dissolved oxygen amount is less than the lower limit dissolved oxygen amount of the safe dissolved oxygen amount range based on the biological information, hypoxia A control program characterized by causing a warning that there is a possibility of reaching 20. A computer-readable recording medium on which the control program according to any one of claims 16 to 19 is recorded.

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