JP2007330708A - Oxygen saturation measuring instrument, control program of oxygen saturation measuring instrument, and recording medium recording control program of oxygen saturation measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an always attachable oxygen saturation measuring instrument that can accurately measure the oxygen saturation. <P>SOLUTION: This oxygen saturation measuring instrument 1 is a finger-ring type device for measuring the oxygen saturation based on the pulse measured from a digital artery, has a pressure adjusting section 5 for pressing the measuring object part of the oxygen saturation to increase the pulsation of the artery, and measures the oxygen saturation in a pressed state of the measuring object part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ring-type oxygen saturation measuring device, an oxygen saturation measuring device for measuring oxygen saturation based on a pulse wave measured from an artery of a finger of the living body, a control program for the oxygen saturation measuring device, and oxygen The present invention relates to a recording medium on which a control program for a saturation measuring apparatus is recorded.

  2. Description of the Related Art Conventionally, pulse oximeters that calculate oxygen saturation from the amplitude component of light transmitted through tissue have been widely used as an (oximetry) device for measuring oxygen saturation in blood, mainly in the medical field.

  The pulse oximeter uses the difference in absorbance between oxyhemoglobin and deoxyhemoglobin in blood to determine the oxygen saturation level in the blood. The degree of light absorption by applying two or more different wavelengths of light. And the oxygen content in the blood is calculated from the measurement result. In particular, the pulse oximeter pays attention to the pulsation in the living tissue, and calculates the oxygen saturation from the amplitude component corresponding to the pulsation of the blood vessel of the light transmitted through the tissue.

  In general, the pulse oximeter is attached to the fingertip or earlobe for use due to reasons such as high signal intensity of blood vessel pulsation, less discomfort in wearing, and easy sensor fixation. Is done.

  In other words, there are no large blood vessels such as arteries at the fingertip or earlobe, but many peripheral blood vessels are gathered. For example, between a photodiode (PD) and a light-emitting diode (LED). A large pulsating component signal can be obtained in the sandwiched optical path.

  Also, since the fingertip or earlobe is less sensitive to pressure than other parts, the pulse oximeter can be worn without imposing a heavy burden on the user. Moreover, the flow of the artery is not obstructed by the pressure. In this way, when wearing a pulse oximeter on the fingertip or earlobe, it is easier to devise the device because the feeling of wearing is better than other parts. It is also possible to prevent the measurement target part from moving due to body movement, which is the problem of the number.

  However, the pulse oximeter for measuring oxygen saturation by wearing it on the fingertip or the earlobe as described above is supposed to be temporarily used for a short time, and is not supposed to be always worn. For this reason, if the above-described pulse oximeter is always worn and used, it is always worn on the fingertip or the earlobe, resulting in trouble in daily life. Furthermore, it is difficult to say that it is not comfortable to continue to put pressure on the fingertip, and it has been reported that low-temperature burns occur due to poor blood circulation.

Therefore, a ring-type pulse oximeter has been developed as a pulse oximeter that is always attached and capable of continuously measuring oxygen saturation (for example, Patent Documents 1 and 2). These devices include a light receiving unit and a light emitting unit inside a ring-shaped housing, and perform pulse oximetry on a blood vessel at the base of the finger. This ring-type pulse oximeter can be worn like a normal ring compared to a pulse oximeter worn on the fingertip. For this reason, a hand can be used freely without restraining a fingertip, and it is suitable for long-time wearing.
JP 2002-224088 A (published on August 13, 2002) JP 2001-70264 A (published March 21, 2001) Yuji Kimura, “Introduction to Biological Instrumentation”, Corona, November 2004, p. 19

  However, the conventional ring-type pulse oximeter is suitable for regular wearing, but has a problem that the oxygen saturation cannot be accurately measured.

  Specifically, at the base of the finger to which the ring-type pulse oximeter is attached, as shown in FIG. 8, a thick finger artery is present in a deep portion near the finger bone, but is present in a shallow portion near the skin surface. There are few peripheral blood vessels, and there are few pulsating components in the optical path between optical elements. For this reason, the ring-type pulse oximeter cannot accurately measure the oxygen saturation as compared with the case where the oxygen saturation is measured from a fingertip or the like.

  In addition, regardless of the site where the pulse oximeter is attached, the blood vessel contracts during shock or low body temperature, resulting in low perfusion, resulting in a problem that the measurement accuracy of oxygen saturation is significantly reduced.

  The present invention has been made in view of the above problems, and its purpose is to perform oxygen saturation measurement with high accuracy, an oxygen saturation measurement device that can be always worn, an oxygen saturation measurement device, The object is to realize a recording medium in which a control program for an oxygen saturation measuring device and a control program for the oxygen saturation measuring device are recorded.

  In order to solve the above problems, an oxygen saturation measuring apparatus according to the present invention is a ring-type oxygen that is attached to a finger of a living body and measures oxygen saturation based on a pulse wave measured from an artery of the living body's finger. A saturation measuring device, wherein the living body has a pressure adjusting unit that changes and adjusts the pressure for pressing the measurement target site of oxygen saturation, and a detection unit that detects a biological signal from the measurement target site, Based on the biological signal detected by the detection unit, a determination unit that determines whether or not the measurement target part needs to be pressed, and when the determination unit determines that the pressing is necessary, the measurement target part is pressed And an instruction means for instructing the pressure adjusting unit, and measuring the oxygen saturation in a state where the measurement target portion is pressed by the pressure adjusting unit.

  The oxygen saturation measurement target part is a part for measuring a pulse wave in order to measure oxygen saturation in a living body, and may be the entire finger on which the oxygen saturation measurement device is attached, It may be a part of it. In addition, since the oxygen saturation measuring device according to the present invention is a ring type, it is a device having a small burden even if it is always worn on a biological finger.

  According to the above configuration, since the pressure adjusting unit is provided, for example, there are few detectable pulsation components, or the blood vessel contracts due to hypothermia, and the measurement accuracy of oxygen saturation is reduced. However, it is possible to accurately measure the oxygen saturation by pressing the measurement target part so as to increase the pulsation of the artery as necessary.

  In addition, since the determination means and the instruction means are provided, the determination means determines the necessity of pressing against the measurement target part, and if it is necessary to press according to the determination, the determination means instructs the pressure adjustment unit. The measurement target part can be automatically pressed.

  Therefore, since the measurement target part can be pressed only when necessary without being always pressed, the oxygen saturation measuring device according to the present invention can be always mounted.

  For this reason, the oxygen saturation measuring device according to the present invention has an effect that it can be always attached and can measure the oxygen saturation with high accuracy.

  In order to solve the above problems, an oxygen saturation measuring apparatus according to the present invention is a ring-type oxygen that is attached to a finger of a living body and measures oxygen saturation based on a pulse wave measured from an artery of the living body's finger. A saturation measuring device, wherein the living body has a pressure adjusting unit that changes and adjusts the pressure for pressing the measurement target site of oxygen saturation, and a detection unit that detects a biological signal from the measurement target site, Based on the biological signal detected by the detection unit, a determination unit that determines whether or not there is a need to press the measurement target part; and when the determination unit determines that the pressing is necessary, the pressing of the measurement target part Presenting means for presenting information indicating that the measurement is performed, and the oxygen saturation is measured in a state in which the measurement target portion is pressed by the pressing adjustment unit.

  According to the above configuration, since the pressure adjusting unit is provided, for example, there are few detectable pulsation components, or the blood vessel contracts due to hypothermia, and the measurement accuracy of oxygen saturation is reduced. However, it is possible to accurately measure the oxygen saturation by pressing the measurement target part so as to increase the pulsation of the artery as necessary.

  Moreover, since the determination means and the presentation means are provided, it is possible to determine the necessity of pressing the measurement target part, and when it is necessary to press, information indicating that can be presented. For this reason, it is possible to prompt the user to press the measurement target region by operating the pressing adjustment unit.

  In this way, since the necessity of pressing can be determined and pressing of the measurement target part can be promoted, the measurement target part can be pressed only when necessary without being pressed and constantly tightened. .

  Therefore, the oxygen saturation measuring device according to the present invention has an effect that it can be always worn and can measure the oxygen saturation with high accuracy.

  The oxygen saturation measuring apparatus according to the present invention further includes a pulse wave measuring unit for measuring a pulse wave from the artery in the configuration described above, and the pressure adjusting unit includes the pulse wave measuring unit and the measurement object. It is preferable to be configured such that the distance to the part is close.

  According to the above configuration, the pulse wave measurement unit and the measurement target part are pressed so as to be close to each other, so that the pulse wave component measurable by the measurement unit can be increased.

  Therefore, the oxygen saturation measuring apparatus according to the present invention can increase the pulsation of the artery by the pressure adjusting unit and can reduce the distance from the pulse wave measuring unit to the artery, so that the oxygen saturation can be accurately measured. Measurements can be made.

  Moreover, in the oxygen saturation measuring device according to the present invention, in the above-described configuration, it is preferable that the pressure to be pressed by the pressing adjustment unit is 60 to 90 mmHg.

  That is, it is known that the pressure applied to the artery is 60 to 90 mmHg. In addition, the pulsation of the blood vessel becomes maximum when the internal and external pressures in the blood vessel are balanced. For this reason, a bigger pulsation can be acquired and the measurement precision can be improved by making the magnitude | size of the pressure to press into the range of 60-90 mmHg.

  Moreover, the oxygen saturation measuring apparatus according to the present invention has the configuration described above, wherein the detection unit detects a pulse wave from an artery of the living body as the biological signal, and relates to the pulse wave detected by the detection unit. Generating means for generating pulse wave information that is information, the determining means determines whether or not the measurement accuracy of the oxygen saturation is within an allowable range based on the pulse wave information generated by the generating means; When it is determined that the measurement accuracy of the oxygen saturation is out of the allowable range, the pressure on the measurement target part may be determined.

  The pulse wave information is, for example, information such as the pulse rate obtained from the detected pulse wave, the signal intensity of the pulsation component, and the oxygen saturation.

  According to the above configuration, the determination unit determines whether or not the measurement accuracy of the oxygen saturation is within the allowable range from the pulse wave information, and when the measurement accuracy is out of the allowable range, the measurement target part is pressed. Can be determined. That is, the measurement accuracy of the oxygen saturation can be improved by pressing the measurement target site and increasing the pulsation of the artery.

  Further, in the oxygen saturation measuring apparatus according to the present invention, in the configuration described above, the pulse wave information is information indicating a signal intensity of a pulsation component obtained from the pulse wave detected by the detection unit, and the determining means Determines whether the measurement accuracy of the measured oxygen saturation is within an allowable range based on whether the signal intensity of the pulsating component has sufficient intensity to measure the oxygen saturation. It is preferable that it is comprised.

  By the way, the smaller the signal intensity of the pulse rate component, the smaller the level of the pulse wave used for calculating the oxygen saturation, and it becomes difficult to calculate the oxygen saturation with high accuracy.

  According to the said structure, the press with respect to a measurement object site | part is determined based on the magnitude | size of the signal strength of a pulsation component. For this reason, the oxygen saturation measuring apparatus according to the present invention presses the finger that is the measurement target part so that the pulse wave can be taken large when the signal intensity of the pulsating component is small, thereby improving the measurement accuracy of the oxygen saturation. Improvements can be made.

  The oxygen saturation measuring apparatus according to the present invention further includes a storage device for storing pulse rate history information at a normal time of a user who uses the oxygen saturation measuring apparatus in the configuration described above, and the pulse wave information Is information indicating the pulse rate obtained from the pulse wave detected by the detection unit, the determining means, based on whether the pulse rate is within the fluctuation range of the user at the normal time, It is preferable to be configured to determine whether or not the accuracy of the measured oxygen saturation is within an allowable range.

  The oxygen saturation measuring apparatus according to the present invention further includes a storage device that stores history information of oxygen saturation at a normal time of a user who uses the oxygen saturation measuring apparatus in the configuration described above. The wave information is information indicating the oxygen saturation obtained from the pulse wave detected by the detection unit, and the determining means determines whether the oxygen saturation is within a fluctuation range of the user at normal time. Based on the above, it may be configured to determine whether or not the accuracy of the measured oxygen saturation is within an allowable range.

  By the way, when the pulse rate is outside the normal range, or when the fluctuation range of the oxygen saturation is outside the normal range, symptoms such as a change in the physical condition of the user, illness, etc. are assumed, and the physical condition of the user is It is not normal. Thus, the accuracy of the oxygen saturation measured when the user's physical condition is not normal deteriorates.

  According to the above configuration, the pulse rate is measured based on whether or not the user is in a normal fluctuation range or whether the oxygen saturation is in the normal fluctuation range of the user. It is determined whether or not the accuracy of the oxygen saturation is within an allowable range. Then, when it is outside the allowable range, it can be determined to press the finger that is the measurement target part so that the pulse wave can be increased.

  For this reason, the oxygen saturation measuring device according to the present invention is configured so that when the pulse rate or the oxygen saturation is outside the fluctuation range of the user at normal times, the finger that is the measurement target part is taken so that the pulse wave can be taken large. The measurement accuracy of oxygen saturation can be improved by pressing.

  In the oxygen saturation measuring apparatus according to the present invention, in the configuration described above, the detection unit detects a body temperature at the measurement target site as the biological signal, and the determination unit is detected by the detection unit. Based on the measured body temperature, it is determined whether or not the measurement accuracy of the oxygen saturation is within the allowable range, and when it is determined that the measurement accuracy of the oxygen saturation is outside the allowable range, the pressure on the measurement target part is determined. It is preferable that it is comprised.

  By the way, when the body temperature is low, for example, 25 ° C. or lower, the blood vessel contracts and becomes hypoperfused, so that the measurement accuracy of oxygen saturation is remarkably lowered.

  According to the above configuration, when the body temperature detected by the detection unit is a temperature at which it is determined that the measurement accuracy of the oxygen saturation is outside the allowable range, it is possible to determine the pressure on the measurement target part.

  For this reason, when it is determined that the body temperature is low and the accuracy of measuring the oxygen saturation is lowered, the oxygen saturation measuring device according to the present invention presses the measurement target region so that the pulse wave can be greatly taken. Thus, the measurement accuracy of oxygen saturation can be improved.

  Further, in the oxygen saturation measuring apparatus according to the present invention, in the configuration described above, the detection unit detects acceleration generated in the measurement target site as the biological signal, and the determination unit is configured by the detection unit. Based on the detected acceleration, it is determined whether or not the measurement accuracy of the oxygen saturation is within the allowable range, and when it is determined that the measurement accuracy of the oxygen saturation is out of the allowable range, the pressure on the measurement target part is determined. It may be configured to.

  According to the above configuration, since the detection unit detects the acceleration generated in the measurement target part, for example, it is possible to grasp the vibration generated in the measurement target part due to body movement or the like.

  Moreover, when it is determined that the magnitude of the vibration is so large that the measurement target site moves and the oxygen saturation cannot be measured with high accuracy, the determination unit can determine the pressure on the measurement target site.

  For this reason, even if the measurement target part moves due to intense body movement, the measurement target part can be pressed, so that it can be held so as not to move, and the oxygen saturation measurement accuracy Can be improved.

  Further, in the oxygen saturation measuring apparatus according to the present invention, in the configuration described above, the detection unit detects a sweating amount in the measurement target site as the biological signal, and the determination unit is configured by the detection unit. Based on the detected amount of sweating, it is determined whether or not the user's biological condition is normal, and if it is determined that the accuracy of measurement accuracy of oxygen saturation needs to be improved, the pressure on the measurement target part is determined. It may be configured to.

  By the way, when the sweating is larger than the normal range, a dangerous situation is assumed due to a change in the physical condition of the user and symptoms such as illness (for example, respiratory disorder, heart disease, etc.). Thus, in the situation related to the life and death of the user, it is necessary to guarantee the accuracy of the measurement accuracy of the oxygen saturation.

  According to the above configuration, whether or not the state of the living body is normal is determined based on whether or not the amount of sweat is within the fluctuation range in a normal living body. When it is determined that the situation is dangerous, it can be determined to press the finger that is the measurement target part.

  For this reason, the oxygen saturation measuring device according to the present invention presses the measurement target portion so that the pulse wave can be taken larger when it is determined that the amount of sweating is large and the life and death of the user is in danger. Thus, the accuracy of the measured value of oxygen saturation can be improved.

  The oxygen saturation measuring device may be realized by a computer. In this case, the oxygen saturation measuring device that realizes the oxygen saturation measuring device by a computer by operating the computer as each of the above means. These control programs and computer-readable recording media on which the control programs are recorded also fall within the scope of the present invention.

  As described above, the oxygen saturation measuring device according to the present invention is a ring-type oxygen saturation measuring device that is attached to a finger of a living body and measures oxygen saturation based on a pulse wave measured from an artery of the living finger. In the living body, a pressure adjusting unit that changes and adjusts the magnitude of pressure for pressing the measurement target site of oxygen saturation, a detection unit that detects a biological signal from the measurement target site, and the detection unit Based on the detected biological signal, a determination unit that determines whether or not the measurement target part needs to be pressed, and the determination unit determines that the measurement target part needs to be pressed, so that the measurement target part is pressed. An instruction means for instructing the pressure adjusting unit, and measuring the oxygen saturation in a state where the measurement target portion is pressed by the pressure adjusting unit.

  For this reason, the oxygen saturation measuring device according to the present invention has an effect that it can be always attached and can measure the oxygen saturation with high accuracy.

  As described above, the oxygen saturation measuring device according to the present invention is a ring-type oxygen saturation measuring device that is attached to a finger of a living body and measures oxygen saturation based on a pulse wave measured from an artery of the living finger. In the living body, a pressure adjusting unit that changes and adjusts the magnitude of pressure for pressing the measurement target site of oxygen saturation, a detection unit that detects a biological signal from the measurement target site, and the detection unit Based on the detected biological signal, a determination unit that determines whether or not there is a need to press the measurement target part; and when the determination unit determines that there is a need to press, the instruction to press the measurement target part Presenting means for presenting the information, and measuring the oxygen saturation in a state in which the measurement target portion is pressed by the pressing adjustment unit.

  Therefore, the oxygen saturation measuring device according to the present invention has an effect that it can be always worn and can measure the oxygen saturation with high accuracy.

  An embodiment of the present invention will be described below with reference to FIGS. That is, the oxygen saturation measuring apparatus 1 according to the present embodiment is an apparatus that measures the oxygen saturation in blood that is fitted into a finger, and mainly measures the oxygen saturation from the pulsation of the finger artery.

  As shown in FIG. 1, the oxygen saturation measuring device 1 has a mounting part 2, a measurement part (detection part) 4, a pressure adjustment part (press adjustment part) 5, a main body part 3, and an input / output interface part. 6 is provided. FIG. 1 shows an embodiment of the present invention and is a diagram showing an example of a schematic configuration of the appearance of the oxygen saturation measuring device 1.

  The mounting portion 2 has a ring shape (annular shape), and the oxygen saturation measuring device 1 can be mounted by inserting a human finger into the annular portion. Usually, the diameter of the ring-shaped portion is larger than the diameter of the cross section of a general human finger so that any user (user) can easily attach the saturation measuring device to the finger. It has become.

  The measuring unit 4 measures various information from a finger that is a measurement target part. Specifically, the measuring unit 4 includes a light emitting unit (detecting unit / pulse wave measuring unit) 12 for measuring a photoelectric pulse wave and a light receiving unit ( A detection unit / pulse wave measurement unit) 13 and a biosensor 11 for measuring at least one of body temperature, sweating amount, and acceleration at the measurement target site. In the present embodiment, when it is not necessary to separately explain the light emitting unit 12 and the light receiving unit 13, they are collectively referred to as an optical element (pulse wave measuring unit).

  That is, the oxygen saturation measuring apparatus 1 according to the present embodiment irradiates light having different wavelengths (red light and infrared light) from a light emitting unit 12 to a finger that is a measurement target site, and uses the irradiated light. The light receiving unit 13 receives light. The oxygen saturation can be measured based on the received light. The light emitting unit 12 can be realized by, for example, a light emitting diode (LED), and the light receiving unit 13 can be realized by a photodiode (PD). In FIG. 1, the transmissive sensor is designed so that light emitted from the light emitting unit 12 is transmitted through the finger and received by the light receiving unit 13. It may be a reflective sensor that is disposed on the surface and receives light reflected from the light emitting unit 12 on the finger by the light receiving unit 13.

  In addition, since the oxygen saturation measuring apparatus 1 includes the biological sensor 11 as described above, various information in the vicinity of the measurement site of the oxygen saturation can be acquired. For example, when the biosensor 11 is provided with a device that detects the amount of sweat, the amount of sweat in the vicinity of the measurement target region can be grasped. Moreover, when the biosensor 11 is provided with a device that measures the body temperature of the finger near the measurement target region, it can be determined whether or not the measurement target region has a temperature suitable for measurement. For example, when an acceleration sensor is provided as the biological sensor 11, the vibration state in the vicinity of the measurement target part can be grasped from the detection result of the acceleration sensor.

  The pressure adjusting unit 5 presses the finger mounted on the mounting unit 2 and adjusts the magnitude of the pressure generated between the finger and the optical element. In addition, the magnitude | size of the pressure pressed by the pressure adjustment part 5 is 60-90 mmHg.

  In the present embodiment, the pressure adjustment pad 51 in the pressure adjustment unit 5 provided between the mounting unit 2 and the finger moves and presses the finger, and the magnitude of the pressure generated between the finger and the optical element. It is the structure which adjusts thickness. Here, when the pressure adjustment pad 51 is automatically moved, it can be realized, for example, by starting a micro motor in response to an instruction from the main control unit 17 described later. On the other hand, when the pressure adjusting pad 51 is manually moved, the operation unit (not shown) is operated by the user to be moved.

  In addition, although the said pressure adjustment part 5 was comprised so that the pressure adjustment pad 51 might be moved and a finger might be pressed, it is not limited to this. For example, conversely, the pressure adjusting pad 51 presses the light emitting unit 12 and the light receiving unit 13 to adjust the magnitude of the pressure generated between the finger and the light emitting unit 12 and the light receiving unit 13 (optical element). It may be.

  Alternatively, in the case of a configuration in which the diameter size of the annular mounting portion 2 can be freely changed, the pressure adjusting portion 5 may adjust the diameter size of the mounting portion 2.

  In addition, the detailed description regarding the relationship between adjustment of the pressure between a finger | toe and an optical element and the measurement process of oxygen saturation by this light emission part 12 and the light-receiving part 13 is mentioned later.

  The main body 3 processes the detection result of the measuring unit 4 provided in the mounting unit 2 and controls the pressure adjusting unit 5.

  The input / output interface unit 6 includes an operation unit 14 that can accept input from a user and a display unit 15 that presents information to the user. The operation unit 14 can be realized by, for example, a touch panel, operation buttons, numeric keys, and the like. The display unit 15 can be realized by, for example, a liquid crystal display (LCD).

  More specifically, the operation unit 14 can switch the display screen in accordance with an instruction from the user. Further, the operation unit 14 receives information indicating an input of information to be stored as the pressure adjustment determination information 21 and an automatic or manual switching instruction for pressure adjustment in response to an instruction from the user.

  The display unit 15 displays oxygen saturation, pulse, body temperature, acceleration, sweat amount, and the like measured from the finger artery.

  The oxygen saturation measuring apparatus 1 according to the present embodiment includes, as main components, the above-described measuring unit 4 (biological sensor 11, light emitting unit 12, light receiving unit 13), pressure adjusting unit 5, and input / output interface. In addition to the unit 6 (the operation unit 14 and the display unit 15), the main control unit 17 that performs various controls of these units, the oxygen saturation measurement period, and the timing unit 16 that measures the period during which the measurement target part is pressed, and the pressure The storage device 18 further stores the adjustment determination information 21 and the history information 22. FIG. 2 is a diagram illustrating an embodiment of the present invention, and is a diagram illustrating a configuration of a main part of the oxygen saturation measuring apparatus 1.

  The pressure adjustment determination information 21 stored in the storage device 18 is information for determining whether to apply pressure by activating the pressure adjustment unit 5 and pressing a finger, and the history information 22 is measured. This is information in which the value of oxygen saturation and the history of pulse rate are recorded. Details of the pressure adjustment determination information 21 and the history information 22 will be described later.

(Relationship between pressure change and measurement processing)
Here, the relationship between the pressure change between the finger and the light emitting element and the oxygen saturation measurement process in the oxygen saturation measurement apparatus 1 according to the present embodiment will be described.

  In order to effectively observe the arterial component of a finger, it is known that tightening the finger is effective. That is, in the case of the configuration including the ring-shaped mounting portion 2 as in the oxygen saturation measuring apparatus 1 according to the present embodiment, the following two points can be given as main effects of pressing and tightening the finger.

  First, the finger included in the light propagation path (light path) between the optical elements (between the PD and the LED) is obtained by pressing the finger and physically bringing the distance between the finger artery and the optical element provided in the mounting portion 2 into close proximity. The amplitude component corresponding to the pulsation of the artery can be increased. The other point is that the pulsation of the finger artery itself can be increased by tightening the finger.

  First, the former effect will be described in detail with reference to FIG. FIG. 4 is a diagram for explaining an outline of a state in which the ring-type oxygen saturation measuring device 1 is fitted into a finger, and FIG. 4A shows a state in which the finger is not pressed against the fitted finger. It is sectional drawing and the figure (b) is sectional drawing which shows the state which pressed the finger | toe from the state of the figure (a).

  The light propagation path in the living body shown in FIGS. 4 (a) and 4 (b) is a typical path (light path) until light irradiated from the light emitting unit 12 propagates to the light receiving unit 13. It is shown in Strictly speaking, the light emitted from the light emitting unit 12 strikes a peripheral blood vessel or the like and is diffusely reflected so that not all light rays necessarily pass through the light propagation paths shown in FIGS. 4 (a) and 4 (b). However, here, in order to more clearly explain the relationship between the finger artery and the optical path of the irradiated light, only the main optical path is schematically shown.

  As shown in FIG. 8, the inside of the finger has a bone at the upper center of the finger, and thick finger arteries run on the lower left and right of the bone. The pressure adjustment unit 5 includes a pressure adjustment pad 51, and is configured to press the pressure adjustment pad 51 from above and press the finger against the optical element. FIG. 4A shows a state where the finger is not pressed (low restraint state). In this case, the finger artery is far from the optical path, and the pulsation that can be observed is very small. On the other hand, when pressure is applied to the finger by the pressure adjustment pad 51 as shown in FIG. 4B, the pulsation that can be observed increases as the finger artery approaches the optical path.

  Next, the latter effect will be described with reference to FIG. FIG. 9 is a graph showing the relationship between the type of blood vessel and the pressure of each blood vessel (see Non-Patent Document 1). From FIG. 9, it can be seen that the pressure is low at 10-60 mmHg for capillaries and the pressure is high at 60-90 mmHg for arteries.

  Here, the blood pressure is a value calculated from the pressure from the inside of the blood vessel and the pressure from the outside, and the pulsation of the blood vessel becomes maximum when the pressure inside and outside is balanced. Although details are omitted, it is easy to understand the principle of the sphygmomanometer. First, tighten the arm tightly from the outside to stop the blood flow, and gradually loosen it to start flowing when the external pressure equals to the maximum blood pressure. The pulsation observed at this time is small, the pulsation increases as the arm band is loosened, and the pulsation becomes maximum when the external pressure = average blood pressure. When the pressure is further relaxed, the observed pulsation becomes smaller, and the pulsation is not felt at the point where the external pressure = minimum blood pressure.

  Here, when the ring is worn in a low restraint state, the pulsation component of the capillary is mainly observed, and the pulsation of the finger artery that can be observed is relatively small. However, by tightening the finger with the pressure adjustment mechanism, the blood pressure and the external pressure of the finger arteries approach each other, and the pulsation that can be observed increases.

  As described above, in the oxygen saturation measuring apparatus 1 according to the present embodiment, it is possible to efficiently observe pulsations in an artery by pressing a finger and applying pressure.

  However, while pulsation can be observed efficiently, blood flow is hampered by continuing to tighten the finger, and it goes without saying that it gives an unpleasant wearing feeling, increasing the risk of physical damage due to poor circulation and low-temperature burns. End up. Furthermore, the reliability of the oxygen saturation value obtained by measuring with a congested finger is low.

  Therefore, the oxygen saturation measuring apparatus 1 according to the present embodiment is normally always mounted in a low restraint state as shown in FIG. 4 (a) so that the pressure can be adjusted as necessary during measurement. It is configured. Furthermore, according to the detection result from the biosensor 11, when the reliability with respect to the measured value of oxygen saturation is reduced or when the oxygen saturation is obtained with high accuracy, the appropriate pressure adjustment is performed. It is configured to determine timing.

  Hereinafter, details of the oxygen saturation measurement process in the oxygen saturation measurement apparatus 1 according to the present embodiment will be described with reference to FIG. FIG. 3 shows an embodiment of the present invention and is a block diagram showing a main configuration of the oxygen saturation measuring device 1 related to the oxygen saturation measuring process.

(Oxygen saturation measurement process)
As shown in FIG. 3, the oxygen saturation measuring apparatus 1 according to the present embodiment includes a biological information generation unit 31, a pulse wave information generation unit (generation) as a functional block in the main control unit 17 in the block diagram shown in FIG. 2. Means) 32, a light source control unit 33, an oxygen saturation calculation unit (generation unit) 34, a recording setting unit 35, a pressure adjustment determination unit (determination unit) 36, and a pressure adjustment instruction unit (instruction unit / presentation unit) 37. It is the composition which becomes. In the case where the main control unit 17 can be realized by, for example, a CPU, this functional block can be realized by the CPU reading a program stored in a ROM (not shown) into a RAM (not shown) and executing it.

  The biological information generation unit 31 receives a signal related to body temperature, sweat volume, or vibration in the measurement target region detected by the biological sensor 11, and generates biological information based on the signal. . The biological information generation unit 31 transmits the generated biological information to the pressure adjustment determination unit 36.

  The pulse wave information generation unit 32 processes the photoelectric signal input from the light receiving unit 13 to generate pulse wave information. The pulse wave information also includes pulse information indicating the pulse rate obtained from the detected pulse wave, and signal intensity information related to the signal intensity of the pulsating component.

  That is, the oxygen saturation measuring apparatus according to the present embodiment measures the oxygen saturation using the difference in absorbance between, for example, red light and infrared light of oxyhemoglobin and reduced hemoglobin in arterial blood. . For this reason, the pulse wave information includes information on a pulse wave measured by irradiating red light and a pulse wave measured by irradiating infrared light.

  The pulse information included in the pulse wave information can be obtained, for example, by obtaining the peak interval of each pulse wave by infrared light and converting it to the number of pulses per minute.

  The pulse wave information generation unit 32 transmits pulse wave information obtained by irradiating each of red light and infrared light among the generated pulse wave information to the pressure adjustment determination unit 36 and the oxygen saturation calculation unit 34. To do. Further, the pulse wave information generation unit 32 outputs the pulse information of the generated pulse wave information to the pressure adjustment determination unit 36 and the record setting unit 35. Further, the pulse wave information generation unit 32 outputs signal intensity information among the generated pulse wave information to the pressure adjustment determination unit 36.

  The light source control unit 33 controls the light emission timing and the light emission intensity in the light emitting unit 12. The light source control unit 33 controls the light emission timing and the light emission intensity in the light emitting unit 12 according to the oxygen saturation measurement instruction from the user input from the operation unit 14.

  The oxygen saturation calculation unit 34 calculates the ratio of the absorbance of the wavelengths of red light and infrared light from the pulse wave information received from the pulse wave information generation unit 32 to obtain the value of oxygen saturation. The oxygen saturation calculation unit 34 outputs the calculation result to the pressure adjustment determination unit 36 and also to the recording setting unit 35.

  The record setting unit 35 records the history of the pulse information input from the pulse wave information generation unit 32 and the value of oxygen saturation input from the oxygen saturation calculation unit 34 in the storage device 18 as history information 22. Is. Further, the record setting unit 35 sets a range of values of the pulse rate and the oxygen saturation value at the normal time of the user who uses the oxygen saturation measuring device 1 from the history information 22 stored in the storage device 18 for a predetermined period. Is.

  The record setting unit 35 records the set information as the pressure adjustment determination information 21 when the pulse rate and the oxygen saturation value of the user at the normal time are set.

  In the pressure adjustment determination unit 36, the biological information input from the biological information generation unit 31, the pulse information input from the pulse wave information generation unit 32, the signal intensity information, and the oxygen saturation input from the oxygen saturation calculation unit 34 Based on this value, the pressure adjustment determination information 21 is referred to and it is determined whether or not pressure is applied to the finger. When determining that it is necessary to apply pressure, the pressure adjustment determination unit 36 notifies the pressure adjustment instruction unit 37 of information indicating that.

  Further, the pressure adjustment determination unit 36 outputs the input biological information, pulse information, and oxygen saturation value to the display unit 15 for display.

  Here, the detail regarding the pressure adjustment determination information 21 to which the pressure adjustment determination part 36 refers is demonstrated. As shown in FIG. 5, the pressure adjustment determination information 21 is information indicating a reference for determining whether or not it is necessary to drive the pressure adjustment unit 5 to apply pressure to the finger. This pressure adjustment determination information 21 includes information regarding conditions that are not individual-specific and are generally applicable to third parties, and conditions that are determined according to individual users.

  Note that information on conditions that are generally applicable to a third person is, for example, information on whether the body temperature is greater than 25 ° C. and whether the signal intensity of the pulsating component is greater than a predetermined value. is there. The information on the condition determined according to the individual user is, for example, information such as the normal pulse rate of the user and the value of oxygen saturation.

  Information indicating conditions applicable to the third party is input from the operation unit 14 and stored in the storage device 18 as pressure adjustment determination information 21. On the other hand, information determined according to the individual user is set by the recording setting unit 35 as described above and stored in the storage device 18 as the pressure adjustment determination information 21.

  Note that the case where it is determined by the pressure adjustment determination unit 36 that it is necessary to apply pressure is a case where the measurement accuracy of the oxygen saturation is outside the allowable range, as will be described later. For this reason, the pressure adjustment determination information 21 used for this determination is set according to this allowable range.

  The pressure adjustment instructing unit 37 instructs the pressure adjusting unit 5 to press the finger according to the determination result from the pressure adjustment determining unit 36 or the display unit 15 to press the finger. It controls to display a warning display to instruct.

  That is, when the pressure adjustment determination unit 36 determines that it is necessary to press a finger, and when the operation unit 14 instructs to automatically adjust the pressure, the pressure adjustment instruction unit 37 The control information is transmitted so as to press the finger to 5. On the other hand, when it is instructed to manually adjust the pressure from the operation unit 14, the pressure adjustment instruction unit 37 controls the display unit 15 to display a warning for instructing the finger pressing.

  In addition, the pressure adjustment instructing unit 37 instructs the time measuring unit 16 to measure a predetermined period from when the pressure adjusting unit 5 is instructed to press the finger or when the user completes the setting of the finger pressing. It is configured.

  That is, the oxygen saturation measuring apparatus 1 is configured to release the pressure after a predetermined time has elapsed so as not to adversely affect the living body when the oxygen saturation is measured by pressing the finger. For this reason, after a predetermined period of time has passed since the finger was pressed, the pressure adjustment instruction unit 37 controls the pressure adjustment unit 5 to release the pressure setting for the finger, or instructs the display unit 15 to release the pressure setting. A warning is displayed.

  As described above, in the oxygen saturation measuring apparatus 1 according to the present embodiment, the biological signal is detected by the biological sensor 11, and the biological information generating unit 31 generates biological information based on the signal to generate pressure. It transmits to the adjustment determination part 36.

  Further, when measuring the oxygen saturation, in the oxygen saturation measuring apparatus 1, the light emitting unit 12 emits light according to a control instruction from the light source control unit 33 and irradiates the finger with light. When the irradiated light is received by the light receiving unit 13, a photoelectric signal obtained by receiving the light is output to the pulse wave information generating unit 32. When receiving the photoelectric signal, the pulse wave information generation unit 32 processes the signal to generate pulse wave information and pulse information, and the pulse wave information is input to the oxygen saturation calculation unit 34 and the pulse information is converted to the pressure adjustment determination unit 36. To the recording setting unit 35.

  The oxygen saturation calculator 34 calculates the value of oxygen saturation based on the pulse wave information input from the pulse wave information generator 32. Then, the calculated value of oxygen saturation is transmitted to the pressure adjustment determination unit 36 and the record setting unit 35.

  The record setting unit 35 stores the pulse information input from the pulse wave information generation unit 32 and the oxygen saturation input from the oxygen saturation calculation unit 34 as history information 22 in association with the measured date and time. 18 is recorded. Then, the record setting unit 35 sets the range of the oxygen saturation and the pulse rate of the user of the oxygen saturation measuring device 1 from the history information 22 for a predetermined period, and records it as the pressure adjustment determination information 21.

  On the other hand, the pressure adjustment determination unit 36 includes the biological information input from the biological information generation unit 31, the pulse information input from the pulse wave information generation unit 32, and the oxygen saturation input from the oxygen saturation calculation unit 34. Based on this, the pressure adjustment determination information 21 is referenced to determine whether or not it is necessary to press against the finger that is the measurement target part. Further, the pressure adjustment determination unit 36 controls the display unit 15 to display the input biological information, pulse information, and oxygen saturation.

The pressure adjustment instruction unit 37 controls the pressure adjustment unit 5 to press the finger according to the determination result from the pressure adjustment determination unit 36, or displays a warning to the user so as to press the finger. .
(Processing flow of oxygen saturation measurement processing)
Next, a process flow related to the oxygen saturation measurement process of the oxygen saturation measurement apparatus 1 having the above-described configuration will be described with reference to FIG. FIG. 6 shows an embodiment of the present invention and is a flowchart showing an example of the oxygen saturation measurement process of the oxygen saturation calculation device.

  First, it is assumed that the user is wearing the oxygen saturation measuring apparatus 1 according to the present embodiment on a finger as a premise. In addition, it is assumed that the user automatically presses the finger.

  Under such a premise, when an oxygen saturation measurement instruction is received from the user, the light source control unit 33 controls the timing and the amount of light according to the instruction and causes the light receiving unit 13 to emit light. Then, the light receiving unit 13 receives the result obtained by transmitting the irradiated light through the finger, and the pulse wave information generating unit 32 measures the pulse wave based on the light reception result to generate pulse information and pulse wave information. (Step S11, hereinafter referred to as S11).

  When the pulse wave is measured in this way, the oxygen saturation calculation unit 34 calculates the oxygen saturation based on the pulse wave information (S12).

  After calculating the oxygen saturation, the pressure adjustment determination unit 36 determines whether or not it is necessary to apply pressure to the finger that is the measurement target site (S13). For example, whether or not the signal intensity of the pulsating component is smaller than a predetermined intensity, whether or not the body temperature of the measurement target part detected as biological information is 25 ° C. or less, and the fluctuation of the oxygen saturation received from the oxygen saturation calculator 34 Is in the normal range of the user, whether the pulse rate received from the pulse wave information generation unit 32 is normal, and the like is determined.

  That is, when the signal intensity of the pulsating component is smaller than the predetermined intensity, the measurable pulse wave is weak in the finger that is the measurement target part, and the oxygen saturation cannot be measured stably. In other words, the case where the signal intensity of the pulsating component is smaller than the predetermined intensity can be said to be a case where the pulse wave cannot be measured sufficiently and the measurement accuracy of the oxygen saturation is not good. As described above, when the signal intensity of the pulsating component is smaller than the predetermined intensity, the measurement accuracy of the oxygen saturation can be improved by pressing the finger that is the measurement target part so that the pulse wave can be increased.

  Also, when the pulse rate is outside the normal range, or when the fluctuation range of the oxygen saturation is outside the normal range, symptoms such as changes in the user's physical condition, illness, etc. are assumed, and measurement is possible due to these symptoms Pulse waves become weaker. In other words, when the pulse rate is out of the normal range or when the fluctuation range of the oxygen saturation is out of the normal range, the user's state is not normal and the measurement accuracy of the oxygen saturation is not good. It's a case. In this way, when the pulse rate is outside the normal range, or when the fluctuation range of the oxygen saturation is outside the normal range, oxygen can be obtained by pressing the finger, which is the measurement target site, so that the pulse wave can be greatly increased. The measurement accuracy of the saturation can be improved.

  Further, for example, when the body temperature is 25 ° C. or lower, the blood vessel contracts and becomes hypoperfused, so that the measurement accuracy of the oxygen saturation is remarkably lowered. In other words, the case where the body temperature is 25 ° C. or less can be said to be a case where the environment around the measurement target part is bad and the measurement accuracy of oxygen saturation is not good. As described above, when the body temperature is 25 ° C. or lower, the measurement accuracy of the oxygen saturation can be improved by pressing the finger as the measurement target part so that the pulse wave can be increased.

  Note that the signal intensity of the pulsating component described above is a predetermined intensity, a normal range of pulse rate, and a normal range of fluctuation of oxygen saturation, respectively, which are desired for the oxygen saturation measuring apparatus 1 according to the present embodiment. It is determined according to the measurement accuracy of saturation.

  As described above, the pressure adjustment determination unit 36 determines whether or not the measurement accuracy of the measured oxygen saturation is within the allowable range, and determines that the accuracy of the oxygen saturation is greater than the allowable range. Determine the pressure against.

  If “NO” in the step S13, the pulse is measured and the calculation of the oxygen saturation is repeated. On the other hand, if “YES” in step S13, the pressure adjustment determination unit 36 notifies the determination result to the pressure adjustment instruction unit 37. The pressure adjustment instruction unit 37 responds to the notification from the pressure adjustment determination unit 36 according to the notification. The controller 5 is controlled to be driven (turned on) (S14).

  Further, when controlling the driving of the pressure adjusting unit 5, the pressure adjustment instructing unit 37 instructs the time measuring unit 16 to measure the period during which the finger is pressed. When the period during which the finger is pressed reaches a predetermined period (“YES” in S15), the pressure adjustment instruction unit 37 controls the pressure adjustment unit 5 to stop driving (OFF).

  In addition, the pressure adjustment instruction | indication part 37 sets the grade (for example, 10 second) which can measure oxygen saturation with accuracy as a period which performs a press with respect to a finger | toe.

  On the other hand, until the period during which the finger is pressed reaches a predetermined period (during “NO” in S15), the pulse wave is measured from the finger in the same manner as in steps S11 and S12, and the oxygen saturation is calculated.

  In this way, the oxygen saturation is measured by pressing the finger for a certain period, and when the certain period elapses, the pressure adjusting unit 5 is stopped to return to the initial state (low restraint state), the pulse wave is measured, and the oxygen is measured. Continue to calculate saturation.

  In addition, in the oxygen saturation measuring apparatus 1 which concerns on this Embodiment, the measurement of oxygen saturation is always performed. And when the measurement accuracy of oxygen saturation falls, or when it is necessary to measure oxygen saturation with high accuracy according to the change in the physical condition of the measurement subject, the measurement target portion is configured to be pressed. Yes. For this reason, the oxygen saturation is continuously measured even after the pressure adjusting unit 5 is stopped, and the measurement target part is pressed again as necessary.

  Next, the oxygen saturation measurement process under the following premise will be described with reference to FIG. FIG. 7 shows an embodiment of the present invention and is a flowchart showing an example of the oxygen saturation measurement process of the oxygen saturation calculation device.

  As a premise, it is assumed that the user wears the oxygen saturation measuring apparatus 1 according to the present embodiment on a finger. In addition, it is assumed that the user manually presses the finger.

  First, similarly to step S11 and step S12 shown in FIG. 6, a pulse wave is measured from a finger which is a measurement target part (S21), and oxygen saturation is calculated (S22). And after calculating oxygen saturation like step S13, the pressure adjustment determination part 36 determines the presence or absence of the necessity to apply a pressure with respect to the finger which is a measurement object site | part (S23).

  If “NO” in the step S23, the pulse is measured and the calculation of the oxygen saturation is repeated. On the other hand, in the case of “YES” in step S23, the pressure adjustment determination unit 36 notifies the determination result to the pressure adjustment instruction unit 37. The pressure adjustment instruction unit 37 responds to the notification from the pressure adjustment determination unit 36. A warning display for instructing pressing on the display unit 15 is displayed on the display unit 15 (S24).

  In response to this warning display, when the pressure adjustment instructing unit 37 detects that the user has completed the setting to operate the pressure adjusting unit 5 and press the finger that is the measurement target portion, the time measuring unit 16 is instructed. , Measure the period of pressing the finger.

  The detection of the completion of the setting of the pressure on the finger is executed as follows. That is, the user inputs information notifying the completion of setting from the operation unit 14. And it can detect by the pressure adjustment instruction | indication part 37 receiving this input notification information.

  Here, when the period during which the finger is pressed does not reach the predetermined period (“NO” in S26), the pulse wave is measured in the same manner as in steps S21 and S22 while the finger is pressed (S27). Then, the oxygen saturation is calculated (S28).

  On the other hand, when the period during which the finger is pressed is equal to or longer than the predetermined period (“YES” in S26), the pressure adjustment instruction unit 37 performs a warning display on the display unit 15 to release the pressure on the finger. Control (S29).

  When the user operates the pressure adjusting unit 5 in response to the warning display and the pressure adjustment instructing unit 37 detects that the release of the pressure on the finger that is the measurement target portion is completed (“YES” in S30), step S21 is performed. The process from the measurement of the pulse wave in the low restraint state is repeated.

  On the other hand, during “NO” in step S30, that is, while the release of the manual pressure adjustment has not been completed, the pressure adjustment instruction unit 37 continues the display for warning of the release of the pressure on the display unit 15.

  The detection of the completion of the release of the pressure on the finger is executed as follows. That is, the user inputs information notifying the completion of cancellation from the operation unit 14. And it can detect by the pressure adjustment instruction | indication part 37 receiving this input notification information.

  As described above, the measurement accuracy of the oxygen saturation is within the allowable range based on the pulse rate, the magnitude of the pulse wave, the fluctuation amount of the oxygen saturation, and the body temperature detected from the measurement target site by the pressure adjustment determination unit 36. It can be determined whether or not there is. If it is determined that the measurement accuracy falls outside the allowable range, the pressure adjustment determination unit 36 may determine to press against the measurement target region so as to increase the pulsation in order to improve the measurement accuracy. it can. Then, when it is determined that it is necessary to press, the pressure adjustment instruction unit 37 can automatically control to press the measurement target part or manually press the measurement target part.

  Furthermore, the structure which determines the necessity for the press of a finger | toe may be sufficient in addition to the information regarding the amount of sweating and vibration in a measurement object site | part.

  For example, when the vibration at the position where the oxygen saturation measuring device 1 is mounted is larger than the magnitude of a predetermined vibration, it is configured so as to press the finger that is the measurement target part, thereby causing a body movement or the like. Therefore, it is possible to prevent the oxygen saturation measuring apparatus 1 from moving and the oxygen saturation measurement accuracy from being lowered.

  Further, when sweating is greater than the normal range, a dangerous situation is assumed due to changes in the physical condition of the user, symptoms such as illness (for example, respiratory disorder, heart disease, etc.). Thus, in the situation related to the life and death of the user, it is necessary to guarantee the accuracy of the measurement accuracy of the oxygen saturation.

  Therefore, it is determined whether or not the state of the living body is normal based on whether or not the amount of sweating is within the fluctuation range of a normal living body. When it is determined that the situation is a critical situation, the accuracy of the measurement value of the oxygen saturation can be improved by pressing the finger as the measurement target part so that the pulse wave can be increased.

  Further, in the oxygen saturation measuring apparatus 1 according to the present embodiment, the determination as to whether or not to press the finger that is the measurement target part is performed by determining the pulse rate, the fluctuation of the oxygen saturation, the body temperature, the magnitude of the measurable pulse wave. In addition, the configuration is based on the amount of sweating and the magnitude of vibration. However, this criterion is not limited to this, and at least one of the pulse rate, fluctuation in oxygen saturation, body temperature, measurable pulse wave magnitude, sweating volume, and vibration magnitude is selected. It may be configured to determine the necessity of finger pressing with reference.

  In addition, in the oxygen saturation measuring apparatus according to the present embodiment, in addition to the oxygen saturation, the pulse rate, the signal intensity of the pulse wave component, the body temperature, the amount of sweating, and the like are combined using the biosensor, the light emitting unit, and the light receiving unit. It is a device that can measure. For this reason, the current health condition can be presented to the user, which can contribute to the physical condition management of the user.

  The oxygen saturation measuring apparatus 1 according to the present embodiment has a configuration including only one biosensor 11, but the number of biosensors is not limited to this, and body temperature, sweating amount, acceleration For example, a number corresponding to each type of target to be detected may be provided.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block of the oxygen saturation measuring device 1, in particular, the biological information generation unit 31, the pulse wave information generation unit 32, the light source control unit 33, the oxygen saturation calculation unit 34, the record setting unit 35, the pressure adjustment determination unit 36, And the pressure adjustment instruction | indication part 37 may be comprised by a hardware logic, and may be implement | achieved by software using CPU as follows.

  That is, the oxygen saturation measuring apparatus 1 includes a CPU (central processing unit) that executes instructions of a control program for realizing each function, a ROM (read only memory) that stores the program, and a RAM (random access) that expands the program. memory), a storage device 18 (recording medium) such as a memory for storing the program and various data. An object of the present invention is a record in which a program code (execution format program, intermediate code program, source program) of a control program of the oxygen saturation measuring apparatus 1 which is software for realizing the above-described functions is recorded so as to be readable by a computer. This can also be achieved by supplying a medium to the oxygen saturation measuring apparatus 1 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, and an optical disk such as a CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  Further, the oxygen saturation measuring apparatus 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  Since the oxygen saturation measuring apparatus 1 according to the present embodiment can press the measurement target part and measure the oxygen saturation only when the measurement target part needs to be pressed, the oxygen saturation can be accurately measured. Can be measured. Furthermore, the oxygen saturation according to the present embodiment is suitable for always wearing since the measurement target site is not always pressed down.

  Therefore, the oxygen saturation measuring apparatus 1 according to the present embodiment is particularly advantageous when it is necessary to constantly measure the oxygen saturation.

  In addition, the oxygen saturation measuring apparatus 1 according to the present embodiment is configured to measure the oxygen saturation in human blood. However, the oxygen saturation measuring apparatus 1 according to the present embodiment is not limited to a person whose oxygen saturation is to be measured, and can be widely applied to other living bodies.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing an embodiment of the present invention, is a diagram illustrating an example of a schematic configuration of an appearance of an oxygen saturation measuring device. It is a figure which shows embodiment of this invention, and is a figure which shows the principal part structure of an oxygen saturation measuring apparatus. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention and is a block diagram illustrating a configuration of a main part of an oxygen saturation measurement device according to an oxygen saturation measurement process. It is a figure explaining the outline of the state where the oxygen saturation measuring device concerning this embodiment was inserted in the finger, and the figure (a) is a sectional view showing the state where it is not pressed to the inserted finger. FIG. 4B is a cross-sectional view showing a state where a finger is pressed from the state of FIG. It is a figure which shows an example of the pressure adjustment determination information which the oxygen saturation measuring device which concerns on this Embodiment hold | maintains. 5 is a flowchart illustrating an example of the oxygen saturation measurement process of the oxygen saturation calculation device according to the embodiment of the present invention. 5 is a flowchart illustrating an example of the oxygen saturation measurement process of the oxygen saturation calculation device according to the embodiment of the present invention. It is a figure which shows a prior art and shows the outline of the cross-sectional shape of a finger | toe. It is a graph which shows a prior art and showed the relationship between the kind of blood vessel and the pressure of each blood vessel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oxygen saturation measuring device 2 Wearing part 4 Measuring part (detection part)
5 Pressure adjustment part (Pressing adjustment part)
11 Biosensor (detection unit)
12 Light emitting part (detection part, pulse wave measurement part)
13 Light receiver (detector / pulse wave detector)
18 Storage Device 22 History Information 31 Biological Information Generation Unit 32 Pulse Wave Information Generation Unit (Generation Unit)
34 Oxygen saturation calculation unit (generation means)
36 Pressure adjustment determination unit (determination means)
37 Pressure adjustment instruction section (instruction means / presentation means)

Claims (13)

A ring-type oxygen saturation measuring device that is attached to a living body finger and measures oxygen saturation based on a pulse wave measured from an artery of the living body finger,
A pressure adjusting unit that changes and adjusts the magnitude of pressure for pressing the measurement target site of oxygen saturation in the living body,
A detection unit for detecting a biological signal from the measurement target part;
Based on the biological signal detected by the detection unit, a determination unit that determines whether or not there is a need to press the measurement target part;
An instruction means for instructing the pressing adjustment unit to press the measurement target part when it is determined by the determining means that pressing is required,
An oxygen saturation measuring apparatus that measures oxygen saturation in a state in which a measurement target part is pressed by the pressure adjusting unit. A ring-type oxygen saturation measuring device that is attached to a living body finger and measures oxygen saturation based on a pulse wave measured from an artery of the living body finger,
A pressure adjusting unit that changes and adjusts the magnitude of pressure for pressing the measurement target site of oxygen saturation in the living body,
A detection unit for detecting a biological signal from the measurement target part;
Based on the biological signal detected by the detection unit, a determination unit that determines whether or not there is a need to press the measurement target part;
When it is determined by the determining means that it is necessary to press, it is provided with a presenting means for presenting information to instruct the pressing of the measurement target part,
An oxygen saturation measuring apparatus that measures oxygen saturation in a state in which a measurement target part is pressed by the pressure adjusting unit. A pulse wave measuring unit for measuring a pulse wave from the artery,
3. The oxygen saturation measuring apparatus according to claim 1, wherein the pressure adjusting unit presses the pulse wave measuring unit so that a distance between the pulse wave measuring unit and the measurement target portion is short.   The oxygen saturation measuring device according to any one of claims 1 to 3, wherein the pressure pressed by the pressing adjusting unit is 60 to 90 mmHg. The detection unit detects a pulse wave from the artery of the living body as the biological signal,
Comprising generating means for generating pulse wave information which is information relating to the pulse wave detected by the detection unit;
The determination unit determines whether or not the measurement accuracy of the oxygen saturation is within an allowable range based on the pulse wave information generated by the generation unit, and determines that the measurement accuracy of the oxygen saturation is outside the allowable range. In the case, the oxygen saturation measuring device according to any one of claims 1 to 4, wherein the pressure on the measurement target part is determined. The pulse wave information is information indicating the signal intensity of the pulsation component obtained from the pulse wave detected by the detection unit,
The determining means determines whether or not the measurement accuracy of the measured oxygen saturation is within an allowable range based on whether or not the signal intensity of the pulsating component has a sufficient intensity for measuring the oxygen saturation. The oxygen saturation measuring device according to claim 5, wherein the oxygen saturation measuring device is determined. A storage device for storing the history information of the pulse rate at the normal time of the user who uses the oxygen saturation measuring device,
The pulse wave information is information indicating the pulse rate obtained from the pulse wave detected by the detection unit,
The determining means determines whether or not the accuracy of the measured oxygen saturation is within an allowable range based on whether or not the pulse rate is within a fluctuation range of the user at normal time. The oxygen saturation measuring device according to claim 5, wherein A storage device for storing history information of oxygen saturation at the normal time of a user who uses the oxygen saturation measurement device,
The pulse wave information is information indicating the oxygen saturation obtained from the pulse wave detected by the detection unit,
The determining means determines whether or not the accuracy of the measured oxygen saturation is within an allowable range based on whether or not the oxygen saturation is within a fluctuation range of the user at normal time. The oxygen saturation measuring apparatus according to claim 5. The detection unit detects the body temperature at the measurement target site as the biological signal,
When the determination means determines whether or not the measurement accuracy of the oxygen saturation is within an allowable range based on the body temperature detected by the detection unit, and determines that the measurement accuracy of the oxygen saturation is outside the allowable range The oxygen saturation measuring device according to any one of claims 1 to 4, wherein the pressure on the measurement target part is determined. The detection unit detects acceleration generated in the measurement target site as the biological signal,
The determining means determines whether or not the measurement accuracy of the oxygen saturation is within an allowable range based on the acceleration detected by the detection unit, and determines that the measurement accuracy of the oxygen saturation is outside the allowable range The oxygen saturation measuring device according to any one of claims 1 to 4, wherein the pressure on the measurement target part is determined. The detection unit detects a sweating amount in the measurement target site as the biological signal,
When the determination means determines whether or not the biological state of the user is normal based on the amount of sweat detected by the detection unit, and determines that it is necessary to improve the accuracy of measurement of oxygen saturation The oxygen saturation measuring device according to any one of claims 1 to 4, wherein the pressure on the measurement target part is determined.   A control program for operating the oxygen saturation measuring device according to any one of claims 1 to 11, wherein the control program for the oxygen saturation measuring device causes a computer to function as each of the means.   A computer-readable recording medium in which a control program for the oxygen saturation measuring apparatus according to claim 12 is recorded.

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