JP2014090903A - Oxygen concentration measurement device - Google Patents

Abstract

An oxygen concentration measuring apparatus capable of measuring exercise tolerance without using oxygen concentration in exhaled breath is provided.
An oxygen concentration measurement apparatus includes a compression unit, a pressure adjustment unit, a measurement unit, and a control unit. The compression unit 40 is wound around the body of the measurement subject. The pressure adjustment unit 30 adjusts the pressure that the compression unit 40 applies to the limb. The measurement unit 20 measures the oxygen concentration in the blood on the distal side of the limb with respect to the compression site with light. The control unit 10 calculates the blood flow volume of the limb based on the detection value of the measurement unit 20.
[Selection] Figure 5

Description

  The present invention relates to an oxygen concentration measuring apparatus.

  Conventionally, it is known that oxygen intake is an index of exercise tolerance. The conventional method for measuring exercise tolerance is, for example, measuring the change in oxygen uptake in exhaled gas when exercise is given to the subject, thereby measuring the maximum of the subject as an indicator of exercise tolerance. Measure maximum oxygen uptake during exercise. As a device for measuring the maximum oxygen intake, for example, the measuring device of Patent Document 1 is used. This measuring device has a treadmill and a breath gas analyzer. This measuring apparatus can measure a change in oxygen intake in exhaled gas when an exercise load is applied to the measurement subject.

Japanese Patent Laid-Open No. 2003-154029

  A conventional method for measuring exercise tolerance measures changes in oxygen intake in exhaled gas when a gradually increasing load is applied to the subject using an exercise device such as a treadmill or an ergometer. For this reason, since the user is given an exercise load with the mask on, the burden on the user is large. For this reason, methods for measuring exercise tolerance other than breath gas analysis are required. The exercise tolerance measured using exercise equipment and expiratory gas analysis includes the maximum oxygen intake, the maximum oxygen intake, the anaerobic threshold (AT), and the like.

  The present invention was created based on the above background, and an object thereof is to provide an oxygen concentration measuring apparatus capable of measuring exercise tolerance without using exhaled gas analysis.

  The means includes: a compression unit wound around the limb of the measurement subject, a pressure adjustment unit that adjusts a pressure applied by the compression unit, a distal side of the limb with respect to a portion compressed by the compression unit, or the An oxygen concentration measuring device comprising: a measuring unit that measures the oxygen concentration in the blood of the site compressed by the compression unit with light; and a control unit that calculates the blood flow of the limb based on the detection value of the measuring unit '' Including.

  One form of the above-mentioned means is as follows: “The control unit determines that the limb is compressed by the compression unit while the subject is at rest and is ischemic based on the blood flow of the limb based on the detection value of the measurement unit. And an oxygen concentration measuring device that estimates the exercise tolerance index of the person to be measured based on the detection value of the measurement unit during a given period.

  One form of the above means is that “the oxygen concentration measuring device has a supporter member, and the compression unit, the pressure adjusting unit, the measuring unit, and the control unit are attached to the supporter member. "including.

  One form of the above means is that “the oxygen concentration measuring device has a first supporter member and a second supporter member as the supporter member, and a length adjustment member, wherein the length adjustment member is the first supporter member. The supporter member and the second supporter member are connected, the distance between the first supporter member and the second supporter member can be changed, the compression part is attached to the first supporter member, and the pressure adjustment part is Oxygen concentration measurement is attached to the first supporter member or the second supporter member, the measurement unit is attached to the second supporter member, and the control unit is attached to the first supporter member or the second supporter member Equipment ".

  One form of the above means includes an “oxygen concentration measuring apparatus that measures blood flow using the isosbestic wavelengths of oxygenated hemoglobin and deoxygenated hemoglobin”.

  This oxygen concentration measuring apparatus can measure exercise tolerance without using exhaled gas analysis.

It is a block diagram about the oxygen concentration measuring device of a 1st embodiment, and is a block diagram showing the electric composition of an oxygen concentration measuring device. It is a top view regarding the oxygen concentration measuring apparatus of 1st Embodiment, and is a top view which shows the whole planar structure of the surface of the front side of an oxygen concentration measuring apparatus. It is sectional drawing regarding the oxygen concentration measuring apparatus of 1st Embodiment, and sectional drawing which shows the cross-sectional structure which follows the D2A-D2A line | wire of FIG. It is sectional drawing regarding the oxygen concentration measuring apparatus of 1st Embodiment, and sectional drawing which shows the cross-sectional structure which follows the D2B-D2B line | wire of FIG. It is a front view regarding the oxygen concentration measuring apparatus of 1st Embodiment, and is a front view which shows an oxygen concentration measuring apparatus when wound around a to-be-measured person's leg. It is a schematic diagram regarding the oxygen concentration measuring apparatus of 1st Embodiment, and is a schematic diagram which shows the relationship between a to-be-measured person's leg, a measurement part, and a compression part. It is a flowchart regarding the oxygen concentration measurement apparatus of the first embodiment, and shows a procedure of “oxygen concentration measurement processing”. The graph which shows the light absorbency of oxygenated hemoglobin and deoxygenated hemoglobin. It is a timing chart regarding the oxygen concentration measurement apparatus of the first embodiment, and shows an example of a change in oxygen concentration in the “oxygen concentration measurement process”. It is a graph regarding the oxygen concentration measuring apparatus of 1st Embodiment, and is a graph which shows the relationship between the oxygen concentration fall amount measured by the oxygen concentration measuring apparatus, and an anaerobic work threshold value. It is a graph regarding the oxygen concentration measuring apparatus of 1st Embodiment, and is a graph which shows the relationship between the oxygen concentration fall amount measured by the oxygen concentration measuring apparatus, and the maximum oxygen uptake. It is a top view regarding the oxygen concentration measuring apparatus of 2nd Embodiment, and is a top view which shows the whole planar structure of the surface of the front side of an oxygen concentration measuring apparatus. It is a front view regarding the oxygen concentration measuring apparatus of 2nd Embodiment, and is a front view which shows an oxygen concentration measuring apparatus when wound around a to-be-measured person's leg.

With reference to FIG. 1, the electrical configuration of the oxygen concentration measuring apparatus 1 will be described.
The oxygen concentration measurement apparatus 1 includes a control unit 10, a measurement unit 20, a pressure adjustment unit 30, a compression unit 40, a supporter member 50, an operation unit 60, and a display unit 70. The oxygen concentration measuring apparatus 1 is connected to a power source (not shown) and supplies power to the control unit 10.

  The control unit 10 controls the light emitting unit 21 of the measuring unit 20 and the air pump 31 of the pressure adjusting unit 30. The control unit 10 receives a signal from the light receiving unit 22 of the measurement unit 20. The control unit 10 calculates the oxygen concentration and blood flow in the blood based on the signal from the light receiving unit 22. The operation unit 60 has a measurement start button (not shown) for the measurement subject to start measuring the oxygen concentration. The display unit 70 displays the measurement result.

  The structure of the oxygen concentration measuring device 1 will be described with reference to FIGS. Hereinafter, when the support member 50 is wound around the human body, a surface facing the human body side is referred to as a “back surface”. A surface opposite to the back surface of the support member 50 is referred to as a “front surface”.

  As shown in FIG. 2, the support member 50 has a rectangular shape. The supporter member 50 is formed of a cloth-like member having elasticity. The supporter member 50 includes a window portion 50A, a winding surface fastener 51, and a measurement portion mounting surface fastener 52.

  The window portion 50 </ b> A is formed as an opening that penetrates from the back surface to the front surface of the support member 50. The window portion 50 </ b> A is formed at an intermediate portion in the longitudinal direction of the supporter member 50. The winding surface fastener 51 is located at both ends of the support member 50 in the longitudinal direction. The measuring portion attaching surface fastener 52 is located around the window portion 50A.

  The measuring unit 20 includes a main body 20A, a hook-and-loop fastener 20B, a light emitting unit 21, and a light receiving unit 22. The measuring unit 20 is attached to the end of the supporter member 50 in the short direction. Measurement unit 20 faces window portion 50A. The measurement unit 20 is attached to the front surface of the supporter member 50. Specifically, as shown in FIG. 3, the supporter member 50 and the measurement unit 20 so that the mounting surfaces of the light emitting unit 21 and the light receiving unit 22 of the measurement unit 20 are exposed to the window 50 </ b> A of the supporter member 50. Are superimposed. The surface fastener 20B of the main body 20A of the measurement unit 20 is attached to the measurement unit attachment surface fastener 52 around the window 50A. For this reason, the light emission part 21 and the light-receiving part 22 contact a human body directly.

  The light emitting unit 21 emits near infrared light. As the light emitting unit 21, a multi-LED having three wavelengths of 760 nm, 805 nm, and 840 nm is used. As the light receiving unit 22, a photodiode having a maximum sensitivity wavelength at a wavelength in the range of 700 to 900 nm and in the vicinity thereof is used.

  The light from the light emitting unit 21 passes through the inside of the limb and reaches the light receiving unit 22. The distance from the light emitting unit 21 to the light receiving unit 22 is preferably set to about twice the target penetration depth. For example, when the penetration depth is 1.5 cm, the distance between the light emitting unit 21 and the light receiving unit 22 is set to 3 cm.

  As shown in FIG. 4, the pressure adjustment unit 30 includes an air pump 31 and a tube 32. As shown in FIG. 2, the pressure adjusting unit 30 is attached to the end of the supporter member 50 opposite to the measuring unit 20 in the short direction. The pressure adjustment unit 30 is attached to the front surface of the support member 50.

  As shown in FIG. 4, the compression unit 40 is configured as an airbag. The pressing part 40 is disposed inside the supporter member 50. The pressing portion 40 is attached to an end portion on the opposite side to the measuring portion 20 in the short direction of the supporter member 50. The compression unit 40 is connected to the air pump 31 via the tube 32. The compression part 40 expand | swells when air is supplied inside.

With reference to FIG. 5 and FIG. 6, the measurement procedure of the oxygen concentration measurement using the oxygen concentration measuring apparatus 1 will be described.
(Procedure 1) The person to be measured wraps the oxygen concentration measuring device 1 around the thigh 101, and fixes the winding surface fasteners 51 (see FIG. 2) to each other. The measurement subject places the measurement unit 20 on the distal side of the limb with respect to the compression unit 40. The measurement subject places the compression unit 40 closer to the trunk side of the limb than the measurement unit 20. At this time, as shown in FIG. 6, the compression portion 40 is disposed at a position facing a portion of the muscle to be worn closest to the trunk side. Moreover, the measurement part 20 is arrange | positioned on the muscle abdomen with the thickest muscle thickness. The thigh 101 corresponds to a “body”.

(Procedure 2) A person to be measured sits on a chair and keeps his eyes open.
(Procedure 3) The measurement subject operates the operation unit 60 to start measuring the oxygen concentration.
(Procedure 4) The person to be measured maintains a resting state until the oxygen concentration measurement is completed.

With reference to FIG. 7, the oxygen concentration measurement process performed by the control unit 10 will be described.
In step S <b> 11, the control unit 10 determines whether a measurement start signal is input from the operation unit 60. When it is determined that the measurement start signal is not input, the control unit 10 ends this process. On the other hand, when the control unit 10 determines that the measurement start signal is input, the control unit 10 performs the processing of step S12 to step S17.

  In step S <b> 12, the control unit 10 starts supplying air to the compression unit 40 via the pressure adjustment unit 30. For this reason, the compression part 40 expand | swells and clamp | tightens the to-be-measured person's thigh 101. FIG. Further, the control unit 10 starts measuring the oxygen concentration (hereinafter, “oxygen concentration X”) by the measurement unit 20. The control unit 10 stores the oxygen concentration X every predetermined time.

  When the measurement of the oxygen concentration X is started, the light emitting unit 21 emits near infrared light. The light receiving unit 22 receives near infrared light. The control unit 10 receives a signal corresponding to the amount of light received from the light receiving unit 22. The control unit 10 calculates the oxygen concentration X and the blood flow H based on the signal from the light receiving unit 22.

  In step S <b> 13, the control unit 10 determines a value for determining the ischemic state (hereinafter referred to as “ischemic determination value SHX”) based on the measurement result of the measuring unit 20. ]) It is determined whether or not. The control unit 10 repeats the determination in step S13 every predetermined time until the blood flow rate change speed SH becomes equal to or less than the ischemic determination value SHX.

  When determining that the blood flow rate change speed SH is equal to or less than the ischemic determination value SHX, that is, when determining that the blood flow rate changing speed SH is in the ischemic state, the control unit 10 indicates that the blood flow rate changing speed SH is equal to or less than the ischemic determination value SHX in step S14. It is determined whether or not a predetermined period (hereinafter referred to as “pressurization period TA”) has elapsed since the determination. The controller 10 repeats the determination in step S14 every predetermined time until the pressurization period TA elapses after the blood flow rate change speed SH is determined to be equal to or less than the ischemic determination value SHX.

  When the control unit 10 determines that the pressurization period TA has elapsed after determining that the blood flow rate change speed SH is equal to or less than the ischemic determination value SHX, the control unit 10 stops supplying air to the compression unit 40 in step S15. That is, the compression part 40 is maintained in a state in which the thigh 101 is tightened with a constant pressure.

  In step S <b> 16, the control unit 10 determines whether or not a predetermined period (hereinafter referred to as “blood-blocking period TB”) has elapsed since the supply of air to the compression unit 40 was stopped. The control unit 10 repeats the determination in step S14 every predetermined time until the ischemic period TB elapses after the supply of air to the compression unit 40 is stopped. The ischemic period TB is set according to the purpose. For example, 30 seconds, 1-2 minutes, and 10 minutes are set. As the ischemic period TB is shorter, the burden on the subject can be reduced. The ischemic period TB corresponds to a “period determined to be an ischemic state”.

  When the control unit 10 determines that the ischemic period TB has elapsed after stopping the supply of air to the compression unit 40, the control unit 10 discharges air from the compression unit 40 via the pressure adjustment unit 30, and oxygen is measured by the measurement unit 20. The measurement of the density X is finished, and this process is finished. The control unit 10 calculates an index of exercise tolerance of the measurement subject based on the oxygen concentration X measured by the oxygen concentration measuring device 1 and displays the index on the display unit 70. Specifically, the conventional exercise tolerance index is displayed using a regression line obtained from the relationship between the oxygen concentration decrease amount DX obtained by the experiment and the conventional exercise tolerance index. Conventional indices of exercise tolerance include maximum oxygen uptake, maximum oxygen uptake, and anaerobic work threshold.

A method for calculating the oxygen concentration X will be described with reference to FIG.
Blood contains hemoglobin in red blood cells. Hemoglobin has the form of oxygenated hemoglobin or deoxygenated hemoglobin. The sum of oxygenated and deoxygenated hemoglobin correlates with blood flow.

Oxygenated hemoglobin and deoxygenated hemoglobin have different absorption wavelengths.
Absorbance at a wavelength of 760 nm includes absorbance dependent on oxygenated hemoglobin and absorbance dependent on deoxygenated hemoglobin. At a wavelength of 760 nm, the absorbance of deoxygenated hemoglobin is greater than the absorbance of oxygenated hemoglobin. For this reason, the absorbance at a wavelength of 760 nm depends well on the amount of deoxygenated hemoglobin.

  Absorbance at a wavelength of 840 nm includes absorbance dependent on oxygenated hemoglobin and absorbance dependent on deoxygenated hemoglobin. At a wavelength of 840 nm, the absorbance of oxygenated hemoglobin is greater than the absorbance of deoxygenated hemoglobin. For this reason, the absorbance at 840 nm is highly dependent on the amount of oxygenated hemoglobin.

  For this reason, the control unit 10 calculates the amount of oxygenated hemoglobin and the amount of deoxygenated hemoglobin using the absorbance at a wavelength of 760 nm and the absorbance at 840 nm. The amount of oxygenated hemoglobin reflects the oxygen concentration X in the blood. For this reason, the control unit 10 uses the amount of oxygenated hemoglobin as the oxygen concentration X.

A method for calculating the blood flow H will be described.
Oxygenated hemoglobin and deoxygenated hemoglobin have different absorption wavelengths. Oxygenated hemoglobin and deoxygenated hemoglobin have an isosbestic point of 805 nm in the near infrared region. For this reason, the absorbance at 805 nm reflects the sum of oxygenated hemoglobin and deoxygenated hemoglobin. For this reason, the control unit 10 calculates the blood flow H based on the absorbance at 805 nm.

A change in the oxygen concentration X will be described with reference to FIG.
When the subject is in a resting state and the limb is ischemic, a portion compressed by the compression portion 40 and a portion on the distal side of the limb with respect to the portion compressed by the compression portion 40 (hereinafter referred to as “ischemic region”) The supply of blood, ie oxygen, to the muscle tissue is stopped. Oxygen in the muscle tissue at the site on the distal side of the limb from the site of ischemia is consumed by metabolism in a resting state. That is, the muscle oxygen consumption in the ischemic state well reflects the metabolism in the resting state.

Time t <b> 11 indicates a time when the control unit 10 starts supplying air to the compression unit 40. At this time, the oxygen concentration X starts to decrease.
Time t12 indicates the time when the control unit 10 determines the ischemic state.

  Time t13 indicates the time when the pressurization period TA has elapsed since the time when the control unit 10 determined the ischemic state. At this time, the control unit 10 stops supplying air to the compression unit 40. The pressure of the compression part 40 is maintained constant. For this reason, the oxygen concentration X decreases according to the amount of oxygen consumed in the measurement subject's resting state.

  Time t14 indicates the time when the ischemic period TB has elapsed since the control unit 10 determined the ischemic state. At this time, the control unit 10 discharges air from the compression unit 40. For this reason, the blood flow at the compression site increases. For this reason, the oxygen concentration X starts to rise.

With reference to FIG. 10 and FIG. 11, the relationship between the decrease amount of the oxygen concentration X measured by the oxygen concentration measuring apparatus 1 (hereinafter, “oxygen concentration decrease amount DX”) and the exercise tolerance will be described.
The oxygen concentration decrease amount DX indicates a change rate from the time when the control unit 10 determines that the pressurization period TA has elapsed to a predetermined time.

  In general, the higher the aerobic capacity of the human body, the more slow muscle fibers. Also, slow muscle fibers have a high oxygen consumption in a resting state. For this reason, the higher the aerobic capacity, the greater the oxygen consumption in a resting state. For this reason, an anaerobic threshold, the maximum oxygen intake, the maximum oxygen intake and the like are used as an index of exercise tolerance.

  Conventionally, the maximum oxygen uptake, maximum oxygen uptake, and anaerobic work threshold as indicators of exercise tolerance have been increased by using exercising devices such as ergometers and treadmills, and exhaled gas during exercise It is measured by analyzing. Such conventional measurement of the maximum oxygen intake, the maximum oxygen intake, and the anaerobic work threshold value uses a large-scale apparatus such as an ergometer and a treadmill. In addition, since the measurement subject performs exercise with a controlled load, the load on the measurement subject is large.

  The inventor has found that the oxygen consumption in the blood at the site of ischemia in the ischemic state correlates with the maximum oxygen intake, the maximum oxygen intake, and the anaerobic work threshold, which are indicators of exercise tolerance. That is, the present inventors have found that the oxygen concentration decrease amount DX when the oxygen concentration is measured by the oxygen concentration measuring apparatus 1 correlates with a conventional index of exercise tolerance.

With reference to FIG. 10, the relationship between the oxygen concentration decrease amount DX and the anaerobic work threshold will be described. The anaerobic threshold was measured by a conventional method for analyzing exhaled gas during exercise.
The oxygen concentration decrease amount DX measured by the oxygen concentration measuring device 1 shows an inverse correlation with the anaerobic work threshold. That is, the lower the oxygen concentration decrease amount DX, the higher the anaerobic work threshold value.

With reference to FIG. 11, the relationship between the oxygen concentration decrease amount DX and the maximum oxygen intake amount will be described. The maximum oxygen intake was measured by a conventional method for analyzing exhaled gas during exercise.
The oxygen concentration decrease amount DX measured by the oxygen concentration measuring device 1 shows an inverse correlation with the maximum oxygen intake. In other words, the lower the oxygen concentration decrease amount DX, the higher the maximum oxygen intake.

The operation of the oxygen concentration measuring apparatus 1 will be described.
The oxygen concentration measuring apparatus 1 measures the oxygen concentration X of a measurement subject in a resting state. For this reason, compared with the case where an index of exercise tolerance is measured using an exercise device such as an ergometer or a treadmill, the load on the measurement subject is reduced.

  The oxygen concentration measuring device 1 is wound around the thigh 101 of the person to be measured. For this reason, it is possible to measure exercise tolerance using a simple device as compared with the case of measuring an exercise tolerance index using an exercise device such as an ergometer or a treadmill.

  The oxygen concentration measuring device 1 is appropriately blood-blocked when the support member 50 is not properly wound around the thigh 101 and when the peripheral diameter of the portion around which the support member 50 is wound is too large relative to the size of the support member 50. May not be possible. Further, in the hypothetical oxygen concentration measuring apparatus in which the pressure of the compression unit 40 is constant, when the peripheral diameter of the portion around which the support member 50 is wound is too small with respect to the size of the support member 50, the pressure of the compression unit 40 is high. Therefore, the burden on the person being measured is large.

  The control unit 10 determines the ischemic state using the measurement value of the measurement unit 20. For this reason, the oxygen concentration measuring apparatus 1 can perform ischemia appropriately. For this reason, the measurement accuracy of the oxygen concentration X can be improved.

  Moreover, the oxygen concentration measuring apparatus 1 can suppress that the pressure of the compression part 40 becomes high too much. For this reason, the oxygen concentration measuring apparatus 1 can suppress an increase in the burden on the measurement subject due to excessive compression of the limbs.

The oxygen concentration measuring apparatus 1 according to the first embodiment has the following effects.
(1) The oxygen concentration measuring apparatus 1 measures the oxygen concentration X in the blood of the limbs. The oxygen concentration reduction amount DX in the blood of the limb when compressed by the compression unit correlates with an index of exercise tolerance. For this reason, the oxygen concentration measuring apparatus 1 can measure the oxygen concentration X correlated with the exercise tolerance without using the breath gas analysis.

  (2) The control unit 10 determines the ischemic state. For this reason, the oxygen concentration measuring apparatus 1 can measure the oxygen concentration X in an appropriate ischemic state, that is, in a state where supply of blood to the part where the measurement unit 20 of the limb is disposed is surely stopped. For this reason, the oxygen concentration measuring apparatus 1 can appropriately measure the muscle oxygen consumption at rest. In addition, since the control unit 10 determines the ischemic state, the control unit 10 can perform ischemia with a sufficient pressure. For this reason, it can suppress that the burden concerning a to-be-measured person becomes large.

  (3) The oxygen concentration measuring apparatus 1 can measure the blood flow H and the oxygen concentration X by one measuring unit 20. For this reason, the number of parts can be reduced compared with the structure which has the measurement part for measuring the blood flow H, ie, the ischemic state, and the measurement part which measures oxygen concentration X separately.

  (4) The oxygen concentration measuring apparatus 1 measures the oxygen concentration X in a resting state. For this reason, compared with the case where the index of exercise tolerance is measured by analyzing the expired gas during exercise load, the load on the measurement subject can be reduced.

(5) The oxygen concentration measuring apparatus 1 has a supporter member 50. For this reason, the oxygen concentration X can be easily measured by winding the support member 50 around the limb.
Moreover, since the oxygen concentration measuring apparatus 1 has the supporter member 50, each member of the oxygen concentration measuring apparatus 1 is not easily displaced from the limb. For this reason, it can suppress that the measurement precision of oxygen concentration X falls.

  (6) The control unit 10 measures the oxygen concentration X in the blood using the isosbestic wavelengths of oxygenated hemoglobin and deoxygenated hemoglobin. For this reason, the blood flow rate H can be calculated using only the isosbestic wavelengths of oxygenated hemoglobin and deoxygenated hemoglobin. For this reason, the calculation of the blood flow H is simpler than the case where the blood flow H is calculated using two types of wavelengths, a wavelength shorter than the equal absorption wavelength and a wavelength longer than the equal absorption wavelength.

  (7) The oxygen concentration measuring device 1 can be disposed on the most trunk side of the muscles to which the compression unit 40 is attached. Moreover, the oxygen concentration measuring apparatus 1 can arrange | position the measurement part 20 on the muscular belly with the thickest muscle. For this reason, the change of oxygenated hemoglobin and deoxygenated hemoglobin can be captured more greatly.

(Second Embodiment)
The oxygen concentration measuring apparatus 1 of the present embodiment has a different configuration in the following part compared to the oxygen concentration measuring apparatus 1 of the first embodiment, and has the same configuration in other parts. That is, the oxygen concentration measuring apparatus 1 includes the first supporter member 150A and the second supporter member 150B that are separate members as supporter members.

As shown in FIG. 12, the oxygen concentration measurement apparatus 1 includes a first supporter member 150 </ b> A, a second supporter member 150 </ b> B, and a length adjustment member 153.
The length adjusting member 153 connects the first supporter member 150A and the second supporter member 150B. The length adjusting member 153 can change the distance between the first supporter member 150A and the second supporter member 150B.

The compression part 40 and the pressure adjustment part 30 are attached to the first supporter member 150A.
The control unit 10 and the measurement unit 20 are attached to the second supporter member 150B.
As illustrated in FIG. 13, the measurement subject wraps the first supporter member 150 </ b> A and the second supporter member 150 </ b> B around the thigh 101. At this time, the first supporter member 150A is wound closer to the trunk side than the second supporter member 150B. The second supporter member 150B is wound closer to the end side than the first supporter member 150A.

The operation of the oxygen concentration measuring apparatus 1 will be described.
The length of the femur varies greatly from individual to individual. In the same individual, the length of the upper limb and the length of the lower limb as body limbs are greatly different. For this reason, the distance between an appropriate part for placing the compression unit 40 on the limb and an appropriate part for placing the measurement unit 20 differs depending on the person to be measured and the limb to be worn.

  In the oxygen concentration measuring apparatus 1, the length adjusting member 153 connects the first supporter member 150A and the second supporter member 150B. For this reason, even if it is a case where every to-be-measured person or every use site | part differs, the compression part 40 and the measurement part 20 can be arrange | positioned to an appropriate site | part.

The oxygen concentration measuring apparatus 1 of the second embodiment has the following effects in addition to the effects (1) to (7) of the first embodiment.
(8) The oxygen concentration measuring device 1 has a length adjusting member 153. For this reason, the compression part 40 and the measurement part 20 can be arrange | positioned in a suitable position according to a to-be-measured person's physique. In addition, the compression unit 40 and the measurement unit 20 can be arranged at appropriate positions when the measurement target is measured with either the arm or the thigh 101 as a limb.

(Other embodiments)
This oxygen concentration measuring device includes embodiments other than the first embodiment and the second embodiment. Hereinafter, the modification of 1st Embodiment and 2nd Embodiment as other embodiment of this oxygen concentration measuring apparatus is shown. The following modifications can be combined with each other.

  -As for the oxygen concentration measuring apparatus 1 of 2nd Embodiment, the pressure adjustment part 30 is attached to 150 A of 1st supporter members. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, in the oxygen concentration measurement device 1 according to the modified example, the pressure adjustment unit 30 is attached to the second supporter member 150B.

  -As for oxygen concentration measuring device 1 of a 2nd embodiment, control part 10 is attached to the 2nd supporter member 150B. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, in the oxygen concentration measurement device 1 according to the modification, the control unit 10 is attached to the first supporter member 150A.

-The control part 10 of each embodiment determines an ischemic state, when the blood flow rate change speed SH is below the ischemic determination value SHX. However, the configuration of the control unit 10 is not limited to this. For example, instead of or in addition to the condition that the blood flow rate change rate SH is equal to or less than the ischemic determination value SHX, the control unit 10 according to the modified example changes the ischemic state according to the following determinations (condition 1) to (condition 3). judge.
(Condition 1) Oxygenated hemoglobin (that is, oxygen concentration X) decreases at a constant rate.
(Condition 2) Deoxygenated hemoglobin increases at a constant rate.
(Condition 3) The degree of oxygen saturation (oxygenated hemoglobin / blood flow H) decreases at a constant rate.

  -The control part 10 of each embodiment determines an ischemic state, when the blood flow rate change speed SH is below the ischemic determination value SHX. However, the configuration of the control unit 10 is not limited to this. For example, the control unit 10 according to the modified example determines the ischemic state when the blood flow H is equal to or less than a predetermined value.

  -The compression part 40 of each embodiment is comprised as an airbag arrange | positioned inside the supporter member 50. As shown in FIG. However, the configuration of the compression unit 40 is not limited to this. For example, the support member 50 can be configured as a cuff, and the cuff can be the compression portion 40. Moreover, the compression part 40 of another modification is comprised as an annular member. As for the compression part 40 of this annular member, an annular part expands and contracts, and an inner diameter changes. The compression member 40 of the annular member tightens the limb when the inner diameter becomes small.

-Control part 10 of each embodiment presumes an index of exercise tolerance using oxygen concentration fall amount DX which is a change rate from the time when pressurization period TA passed from the time which judged the ischemic state to the predetermined time. To do. However, the configuration of the control unit 10 is not limited to this. For example, the control unit 10 according to the modified example estimates an exercise tolerance index using any of the following (A) to (C).
(A) The difference between the oxygen concentration X at the time when the ischemic state is determined and the lowest oxygen concentration X in the ischemic state.
(B) The rate of change from the time when the ischemic period TB elapses until the predetermined period elapses.
(C) The difference between the highest oxygen concentration X after the ischemic period TB has elapsed and the lowest oxygen concentration X in the ischemic state.

  The measurement unit 20 of each embodiment includes a light receiving unit 22 as a multi-LED having three wavelengths of 760 nm, 805 nm, and 840 nm. However, the configuration of the measurement unit 20 is not limited to this. For example, the measurement unit 20 of the modification includes a light receiving unit 22 as a multi-LED having two wavelengths of 760 nm and 840 nm. In this case, the blood flow H is calculated using the absorbance at a wavelength of 760 nm and the absorbance at a wavelength of 840 nm.

  -The oxygen concentration measuring apparatus 1 of each embodiment measures the oxygen concentration X of the thigh 101 as a limb. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, the modified oxygen concentration measuring apparatus 1 measures the oxygen concentration X of the arm as a limb. In short, the oxygen concentration measuring apparatus 1 can measure the oxygen concentration X in any part of the limb.

  -The oxygen concentration measuring apparatus 1 of each embodiment measures the oxygen concentration X in the resting state as a to-be-measured person sitting on a chair and having eyes open. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, the oxygen concentration measuring apparatus 1 according to the modified example measures the oxygen concentration X in a resting state where the measurement subject is in a standing position and the eyes are closed. In short, any state can be adopted as a resting state as long as no exercise load is applied to the measurement subject. As a resting state, a state in which there is no voice or physical stimulus from the outside, and the person to be measured does not move and does not emit voice is particularly preferable. In any case, by measuring the resting state over time, such as standing or sitting, open eyes or closed eyes, by measuring the resting state over time, the change in the oxygen concentration reduction amount DX can be changed in the exercise tolerance. Can be used as

  -The oxygen concentration measuring apparatus 1 of each embodiment measures the oxygen concentration X when a to-be-measured person is resting. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, the modified oxygen concentration measuring apparatus 1 measures the oxygen concentration X in a state where an exercise load is applied to the measurement subject.

  The oxygen concentration measurement device 1 of each embodiment has a supporter member 50. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, the supporter member 50 is omitted from the oxygen concentration measuring device 1 according to the modification.

  The oxygen concentration measuring device 1 of each embodiment displays an exercise tolerance index estimated from the oxygen concentration decrease amount DX on the display unit 70. However, the configuration of the oxygen concentration measuring apparatus 1 is not limited to this. For example, the oxygen concentration measuring apparatus 1 according to the modified example displays the oxygen concentration decrease amount DX on the display unit 70 instead of or in addition to the exercise tolerance index.

  DESCRIPTION OF SYMBOLS 1 ... Oxygen concentration measuring apparatus, 10 ... Control part, 20 ... Measurement part, 30 ... Pressure adjustment part, 40 ... Compression part, 50 ... Supporter member, 150A ... 1st supporter member, 150B ... 2nd supporter member, 153 ... Long Adjustable member.

Claims (5)

A compression part wrapped around the limb of the subject,
A pressure adjusting unit that adjusts the pressure applied by the compression unit;
A measurement unit that measures the oxygen concentration in the blood of the distal side of the limb relative to the site compressed by the compression unit or the site compressed by the compression unit by light;
An oxygen concentration measurement apparatus comprising: a control unit that calculates a blood flow of a limb based on a detection value of the measurement unit. The control unit is configured to control the measurement unit in a period in which the limb is compressed by the compression unit while the measurement subject is at rest and the ischemic state is determined based on the blood flow volume of the limb based on the detection value of the measurement unit. The oxygen concentration measuring apparatus according to claim 1, wherein an exercise tolerance index of the measurement subject is estimated based on the detected value. The oxygen concentration measuring device has a support member,
The oxygen concentration measuring device according to claim 1, wherein the compression unit, the pressure adjustment unit, the measurement unit, and the control unit are attached to the supporter member. The oxygen concentration measuring device includes a first supporter member and a second supporter member as the supporter member, and a length adjusting member,
The length adjusting member connects the first supporter member and the second supporter member, and can change the distance between the first supporter member and the second supporter member,
The compression part is attached to the first supporter member,
The pressure adjusting unit is attached to the first supporter member or the second supporter member,
The measurement unit is attached to the second supporter member,
The oxygen concentration measuring device according to claim 3, wherein the control unit is attached to the first supporter member or the second supporter member. The oxygen concentration measurement apparatus according to any one of claims 1 to 4, wherein the measurement unit measures a blood flow using an isosbestic wavelength of oxygenated hemoglobin and deoxygenated hemoglobin.