JP6829001B2 - Blood pressure information estimation device - Google Patents

Description

The present invention relates to a blood pressure information estimation device that estimates blood pressure information of a living body in a non-contact manner.

Conventionally, pulse wave information at a plurality of measurement sites of a living body is optically acquired, the pulse wave propagation time between measurement sites is calculated based on the time difference of the pulse wave information, and the blood pressure of the living body is calculated based on the pulse wave propagation time. A device for estimating information is known (see, for example, Patent Document 1). In the apparatus described in Patent Document 1, blood pressure information of a living body is estimated in a non-contact manner by optically acquiring pulse wave information at a plurality of measurement sites of the living body.

JP-A-2015-54223

By the way, for example, when a living body (human) is sleeping in a lateral decubitus position covered with bedding, only one side of the face is exposed. Therefore, in the method of acquiring pulse wave information at a plurality of measurement sites and estimating the blood pressure information of the living body using the device as in the device described in Patent Document 1, the measurable location is only on one side of the face. The distance between multiple measurement sites becomes closer. Therefore, the time difference of the pulse wave information is not sufficient, and it is difficult to accurately estimate the blood pressure information.

The blood pressure information estimation device according to one aspect of the present invention is specified by a measurement area specifying unit that specifies a measurement area on the surface of the living body that covers the blood vessel and a measurement area specifying unit that is displaced due to expansion and contraction of the blood vessel of the living body at a predetermined site. A sensor unit that non-contactly acquires distance information to a plurality of measurement points in the measurement area using the biological surface at the time of vascular contraction as a reference plane, and a sensor unit that acquires distance information to a plurality of measurement points based on the distance information acquired by the sensor unit. A distance change amount calculation unit that calculates the amount of change in the distance over time and calculates the bulging volume of the measurement area based on the calculated amount of change in the distance to a plurality of measurement points over time, and a distance change a setting unit for setting a reference value of the blood pressure information for swelling the volume of the measurement area calculated by the amount calculator, the swelling volume of the measurement area calculated by the distance change amount calculating section and the reference value set by the setting unit It is provided with a blood pressure information estimation unit that estimates the blood pressure information of a living body based on the measurement.

According to the present invention, the distance information to the measurement point in the measurement region on the surface of the living body, which is displaced due to the expansion and contraction of the blood vessel of the living body, is acquired in a non-contact manner, and the distance to the measurement point is accompanied by the passage of time based on the distance information. Since the amount of change is calculated and the blood pressure information of the living body is estimated based on the change amount, the blood pressure information can be estimated accurately even when the measurable part is limited to only one side of the face.

The perspective view which shows the whole structure of the blood pressure information estimation apparatus which concerns on embodiment of this invention. The schematic diagram which shows the application example of the blood pressure information estimation apparatus which concerns on embodiment of this invention. Sectional drawing of the blood pressure information estimation apparatus which concerns on embodiment of this invention. The block diagram which shows the structure of the control part which comprises the blood pressure information estimation apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the blood vessel running of the face of the living body specified by the sensor control part of FIG. The figure for demonstrating the change when the blood vessel of a living body expands and contracts. The figure which shows an example of the measurement area specified by the measurement area identification part of FIG. It is a figure which shows an example of a short time of the bulging volume of the measurement area calculated by the distance change amount calculation part of FIG. It is a figure which shows an example of the bulge volume of the measurement area calculated by the distance change amount calculation part of FIG. 4 for a long time. The flowchart which shows an example of the process executed by the blood pressure information estimation apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 10. FIG. 1 is a perspective view showing the overall configuration of the blood pressure information estimation device 100 according to the embodiment of the present invention, and FIG. 2 is a schematic view showing an application example of the blood pressure information estimation device 100. The blood pressure information estimation device 100 is used to estimate blood pressure information of a living body (human), particularly a living body at bedtime.

First, an application example of the blood pressure information estimation device 100 will be described with reference to FIG. As shown in FIG. 2, the blood pressure information estimation device 100 is installed toward the face of the measurement target (living body) 200. The blood pressure information estimation device 100 measures the distance d to the measurement target 200, and estimates the blood pressure information of the measurement target 200 based on the distance d.

As shown in FIG. 1, the blood pressure information estimation device 100 includes a substantially light bulb-shaped housing 1. The housing 1 has a conductive base portion 2 on which a screw portion 2a is formed at one end. The screw portion 2a is screwed into, for example, a socket 103 at the tip of a stand 102 attached to the wall surface 101, and power is supplied to the blood pressure information estimation device 100 via the base portion 2. The stand 102 has a flexible movable portion 104, and the orientation of the blood pressure information estimation device 100 can be adjusted via the movable portion 104. The stand 102 may be a ceiling-mounted type, a self-standing type, a clamp type, or the like, in addition to the wall-mounted type, and a shape that is easy to install on the bedside is suitable. A cover 3 made of a translucent resin material is attached to the other end of the housing 1.

FIG. 3 is a cross-sectional view of the blood pressure information estimation device 100. As shown in FIG. 3, a sensor unit 10, a lighting unit 20, and a control unit 30 are arranged in the housing 1, and power is supplied to them from the outside via a base 2 and a cable (not shown). Will be done.

The sensor unit 10 is an infrared distance sensor that detects the distance to the measurement target 200 by irradiating the measurement target 200 (FIG. 2) with infrared rays and receiving the reflected light, and is an infrared LED (light emitting diode) 11. And an infrared camera 12. The infrared LED 11 irradiates infrared rays in the near infrared band (window of the living body) that easily transmits the living body, for example, infrared rays having a wavelength of around 850 nm. The infrared camera 12 has a lens portion through which infrared rays in the near infrared band are transmitted.

The infrared camera 12 includes a zoom lens in the lens portion, and can perform, for example, 5 to 10 times optical zooming. The number of pixels of the infrared camera 12 is, for example, 12 million pixels (3,000 × 4,000 pixels). By zooming, if the shooting area is 600 x 800 mm, which is sufficiently wider than a general pillow around the face of the measurement target 200 while sleeping, specifically, 5 x 5 pieces in 1 mm square. Can take measurement points. This is a sufficient number to calculate the bulging volume of the skin surface due to the dilation of blood vessels, which will be described later. The number of pixels of the infrared camera 12 may be more or less than 12 million pixels in consideration of necessary accuracy and the processing capacity of the control unit 30.

As the lighting unit 20, for example, high-intensity white LEDs arranged at equal intervals in the circumferential direction of the housing 1 can be used. Although the lighting unit 20 is not directly related to the estimation of blood pressure information, it is possible to support comfortable wake-up by lighting and dimming at a timing when it is easy to wake up based on the blood pressure information. The blood pressure information estimation device 100 does not necessarily have to include the lighting unit 20, and the shape of the device is not limited to the shape of a light bulb.

FIG. 4 is a block diagram showing the configuration of the control unit 30. The control unit 30 includes a sensor control unit 31, a measurement area identification unit 32, a distance change amount calculation unit 33, a communication control unit 34, and a blood pressure information estimation unit 35. The sensor unit 10 and the communication module 40 are connected to the control unit 30. The communication module 40 includes a transmission / reception antenna and is arranged in the housing 1. The communication module 40 operates by the electric power supplied through the base unit 2 and enables wireless communication between the control unit 30 and an external device. The control unit 30 is composed of a computer including an arithmetic processing unit including a CPU, a ROM, a RAM, and other peripheral circuits.

The sensor control unit 31 controls the operation of the sensor unit 10. That is, the infrared LED 11 is turned on to start the infrared irradiation, and the infrared camera 12 is turned on to receive the reflected infrared light at regular intervals. The light receiving cycle of the infrared camera 12 is preferably about 30 to 60 frames / sec, for example, but may be longer or shorter in consideration of the processing capacity of the control unit 30 and the like. The sensor control unit 31 controls the operation of the sensor unit 10 to zoom the infrared camera 12. Zooming may be performed automatically by recognizing the face or pillow of the measurement target 200, or may be performed according to the zoom magnification or zoom range set by the user, which is input via an external device described later. You may do so.

The measurement area specifying unit 32 identifies the measurement target 200 based on the distance d (FIG. 2) to the measurement target 200 detected by the sensor unit 10. That is, based on the distance d to each measurement point on the measurement target 200 detected by the sensor unit 10, the skeleton (joint) of the measurement target 200 is recognized and the skeleton position is specified, and on the face of the measurement target 200. A reference plane (a plane that serves as a reference for swelling of the skin surface due to dilation of blood vessels described later) is specified.

Further, the measurement area specifying unit 32 recognizes the running (position) of the blood vessel near the body surface of the measurement target 200 based on the reflected light from the measurement target 200 acquired by the sensor unit 10. That is, based on the reflected light from the measurement target 200 acquired by the sensor unit 10, the place where infrared rays are absorbed by hemoglobin in the blood is recognized as a blood vessel, and the blood vessel running of the measurement target 200 is specified. In addition, what is actually recognized by this method is not the artery but the vein near the body surface, but since the artery and the vein are generally parallel to each other, the running of the artery should be used to estimate the running of the artery. Can be done.

FIG. 5 is a diagram showing an example of blood vessel running on the face of the measurement target 200 specified by the measurement region specifying unit 32, and FIG. 6 is a diagram for explaining changes when the blood vessels of the measurement target 200 expand and contract. Since the superficial temporal artery shown in FIG. 5 is located in the superficial layer and has a skull (frontal bone or temporal bone) directly below it, as shown in FIG. 6, when the blood vessel is dilated, the skin surface of the measurement target 200 is exposed. Easy to displace. In other words, in the vicinity of the superficial temporal artery, the amount of change (bulge height) Δd of the distance d to the measurement target 200 becomes large.

FIG. 7 is a diagram showing an example of the measurement area 320 specified by the measurement area specifying unit 32. The measurement area specifying unit 32 identifies the measurement area 320 based on the skeleton position of the measurement target 200 and the blood vessel running. As the measurement region 320, a region where displacement due to expansion and contraction of a blood vessel can be easily measured is suitable, and for example, a region near the superficial temporal artery is suitable. In FIG. 7, an area of about 10 mm × 20 mm above the eyebrows is shown as an example of the measurement area 320, but the position of the measurement area 320 is not limited to this, and the size may be larger or smaller, and the shape may also be. Not limited to rectangles.

Since the blood vessel running pattern does not change significantly depending on the measurement target 200, if candidates for the measurement area 320 for a general blood vessel running pattern are set in advance, the measurement area 320 can be quickly specified based on the specified blood vessel running. Can be done. If two locations on the left and right as shown in FIG. 7 are set as candidates for the measurement area 320, the measurement target 200 may turn over and the measurable location (photographable location of the infrared camera 12) may change. Even if there is, the measurement can be surely continued. Further, if a plurality of candidates are set, the measurement can be continued more reliably even when the measurable portion changes due to a shield such as hair.

In the present embodiment, the sensor unit 10 that uses infrared rays in the near-infrared band easily identifies the blood vessel running of the measurement target 200. Therefore, the measurement area 320 is specified based on this, but the blood vessel running is not necessarily specified. do not have to. That is, the blood vessel running of the measurement target 200 may not be specified, and the region where the displacement due to the expansion and contraction of the blood vessel is large may be specified as the measurement region 320 based only on the distance information to the measurement target 200.

The distance change amount calculation unit 33 measures the measurement specified by the measurement area specifying unit 32 based on the distance d to the measurement target 200 detected by the sensor unit 10 and the reference plane specified by the measurement area specifying unit 32. The amount of change in the distance d (bulge height with respect to the reference plane) Δd (FIG. 6) to each measurement point in the region 320 is calculated, and the bulge volume ΔV of the measurement region 320 is calculated based on the calculation.

Specifically, the amount of change Δd of the distance d to each measurement point in the measurement area 320 with respect to the reference surface corresponding to the skin surface at the time of vascular contraction (time = 0) after the start of measurement is calculated, and the measurement area 320 The bulge volume ΔV of the measurement region 320 is calculated by integrating the amount of change Δd of the distance d to all the measurement points in the measurement area 320. In the present embodiment, the number of measurement points in the measurement area 320 is 5,000, and the area per measurement point is 0.04 square mm. Therefore, the bulge volume ΔV is up to 5,000 measurement points. It is a value obtained by multiplying the total amount of changes Δd of the distance d by 0.04 square mm.

Since the change amount of the distance d includes the change amount due to the movement of the measurement target 200 in addition to the change amount due to the expansion / contraction of the blood vessel, only the change amount due to the expansion / contraction of the blood vessel is extracted by the fast Fourier transform. For example, only the amount of change in the cycle of about 60 to 100 times per minute, which is the cycle corresponding to the pulse, is extracted to obtain the amount of change (bulge height) Δd of the distance d, and this is integrated into the measurement area 320. The bulge volume ΔV is calculated.

FIG. 8 is a diagram showing an example of a short time of the bulging volume ΔV of the measurement region 320 calculated by the distance change amount calculation unit 33. The peak of the bulging volume ΔV shown in FIG. 8 is associated with the expansion and contraction of the blood vessel when the pulse wave passes through, and can be measured and calculated at a cycle of about 60 to 100 times per minute.

The difference ΔVS between the peak value and the base value of the bulge volume ΔV shown in FIG. 8 corresponds to the bulge amount associated with the expansion and contraction of the blood vessel when the pulse wave passes, and has a correlation with the pulse pressure in the blood pressure information. The peak value in FIG. 8 corresponds to the systolic blood pressure, and the base value corresponds to the diastolic blood pressure. The measurement and calculation of the bulge volume ΔV and the difference ΔVS between the peak value and the base value may be performed continuously, or may be performed intermittently, for example, every 5 minutes for 1 minute. In this case, the value of the difference ΔVS between the peak value and the base value can be, for example, the average value or the maximum value of the values measured and calculated in one minute.

FIG. 9 is a diagram showing an example of a long-time bulge volume ΔV of the measurement region 320 calculated by the distance change amount calculation unit 33. The diamond-shaped plot shown in FIG. 9 plots the peak value of the bulging volume ΔV in FIG. 8, and the quadrangular plot plots the base value of the bulging volume ΔV in FIG. 8 at 30-minute intervals. The transition ΔVL of the bulging volume ΔV shown in FIG. 9 is associated with the expansion and contraction of blood vessels when the blood pressure fluctuates, and is measured and observed in a long cycle such as 7 hours while the measurement target 200 is sleeping. can do.

The transition ΔVL of the bulge volume ΔV shown in FIG. 9 corresponds to the transition of the bulge amount accompanying the expansion and contraction of the blood vessel when the blood pressure fluctuates, and has a correlation with the blood pressure fluctuation in the blood pressure information. The transition ΔVLH of the peak value of the bulging volume ΔV corresponds to the fluctuation of the systolic blood pressure, and the transition ΔVLL of the base value of the bulging volume ΔV corresponds to the fluctuation of the diastolic blood pressure. Since the state of the measurement area 320 differs depending on the measurement target 200, the displacement of the measurement area 320 may not be measured until a specific blood pressure is reached depending on the measurement target 200. Even in such a case, it is possible to monitor whether or not a hypertensive state has occurred in the measurement target 200 depending on the presence or absence of displacement of the measurement region 320.

In the example shown in FIG. 9, the base value of the bulging volume ΔV 1 hour after the start of measurement is a negative value. This means that the skin surface at the time of vasoconstriction 1 hour after the start of measurement is lower than the skin surface (reference plane) at the time of vasoconstriction immediately after the start of measurement, that is, the amount of swelling is reduced. Such a change in the base value of the bulge volume ΔV due to the fluctuation of the diastolic blood pressure of the measurement target 200 can be measured in a state where the bulge is present even when the blood vessel contracts (a state in which the blood vessel is always raised).

The communication control unit 34 controls the communication module 40 so that the control unit 30 and the external device communicate wirelessly. As the external device, for example, a personal computer or a smartphone can be used. By communicating with an external device, it is possible to easily set and change various settings such as measurement start and end of the blood pressure information estimation device 100, zoom magnification and zoom range.

The blood pressure information estimation device 100 can set in advance the systolic blood pressure and diastolic blood pressure of the measurement target 200 at the start of measurement as reference values via an external device. That is, the user actually measures the blood pressure of the measurement target 200 with a cuff type sphygmomanometer or the like, and inputs the blood pressure to the blood pressure information estimation device 100 via an external device.

The blood pressure information estimation unit 35 estimates the blood pressure information of the measurement target 200 based on the reference value input via the external device and the bulge volume ΔV calculated by the distance change amount calculation unit 33. That is, the peak value and the base value of the bulge volume ΔV measured and calculated at the start of measurement are calibrated with the systolic blood pressure and the diastolic blood pressure input as reference values, and based on the bulge volume ΔV measured and calculated thereafter. To estimate blood pressure information (maximum blood pressure, diastolic blood pressure, pulse pressure).

As shown in FIG. 9, the blood pressure information estimation device 100 of the present embodiment can monitor the blood pressure fluctuation of the measurement target 200 via the transition ΔVL of the bulge volume ΔV of the measurement region 320. For example, it is possible to monitor the blood pressure fluctuation of the measurement target 200 during sleep for several days, and based on the result, actually measure the blood pressure especially during the time when the blood pressure rises. Furthermore, if the systolic blood pressure and diastolic blood pressure at this time are also input as reference values, the estimation accuracy of blood pressure information can be improved.

The blood pressure information estimation unit 35 estimates blood pressure information based on the bulging volume ΔV, but depending on the measurement target 200, one point in the measurement area 320 may be significantly displaced. In such a case, the blood pressure information may be estimated based on the amount of change in the distance d (the height of the bulge with respect to the reference plane) Δd instead of the bulge volume ΔV.

The blood pressure information estimated by the blood pressure information estimation unit 35 is transmitted to the external device via the communication module 40, displayed on the display of the external device, and stored in the memory of the external device. It should be noted that the destination of blood pressure information can be a plurality of external devices. For example, it can be sent to a computer of a medical institution or a smartphone of a family member.

FIG. 10 is a flowchart showing an example of processing executed by the control unit 30. This process is started when a measurement start command is input by the user via an external device, and is repeatedly executed at predetermined time intervals until the measurement end command is input. The user may set the measurement time in advance and input only the measurement start command via the external device, or may set the measurement start time and the measurement end time in advance.

In the flowchart of FIG. 10, first, in step S1, the operation of the sensor unit 10 is controlled by processing by the sensor control unit 31, infrared rays are emitted from the infrared LED 11, the reflected light is received by the infrared camera 12, and infrared rays are received. The camera 12 is zoomed and the measurement is started.

Next, in step S2, the skeleton position, the reference plane, and the blood vessel running of the measurement target 200 are specified by the processing in the measurement area specifying unit 32. Then, in step S3, the measurement area 320 is specified. As shown in FIG. 7, the measurement area 320 can be specified on the right side of the face of the measurement target 200 or on the left side. Therefore, the measurement area 320 can be specified on the measurable side according to the sleeping posture of the measurement target 200.

Next, in step S4, the amount of change in the distance d (bulge height with respect to the reference plane) Δd to each measurement point in the measurement area 320 is calculated by the processing in the distance change amount calculation unit 33, and the measurement is performed in step S5. The bulge volume ΔV of the region 320 is calculated.

Next, in step S6, the blood pressure information of the measurement target 200 is estimated by the processing in the blood pressure information estimation unit 35. Next, in step S7, the blood pressure information of the measurement target 200 is transmitted to the external device by the processing in the communication control unit 34.

According to this embodiment, the following effects can be obtained.
(1) The blood pressure information estimation device 100 includes a measurement area specifying unit 32 that specifies a measurement area 320 on the surface of the measurement target 200 that is displaced due to expansion and contraction of the superficial temporal artery (an example of a blood vessel) of the measurement target (living body) 200. The sensor unit 10 that non-contactly acquires the distance information to the measurement point in the measurement area 320 specified by the measurement area identification unit 32, and the distance d to the measurement point based on the distance information acquired by the sensor unit 10. Blood pressure information (maximum blood pressure) of the measurement target 200 based on the distance change amount calculation unit 33 that calculates the change amount Δd with the passage of time and the change amount Δd of the distance d with the passage of time calculated by the distance change amount calculation unit 33. , Minimum blood pressure, pulse pressure), and a blood pressure information estimation unit 35 (FIGS. 3 and 4). As a result, blood pressure information can be accurately estimated even when the measurable portion is limited to only one side of the face, such as when the measurement target 200 is lying on the side and covered with bedding. .. Further, since the measurement target 200 is not given a sense of discomfort due to the contact of the measuring device and the measuring device does not fall off, stress-free and reliable measurement is possible.

(2) The sensor unit 10 has an infrared camera 12 including a zoom lens. Therefore, unlike millimeter-wave radar and laser radar, optical zooming can be performed. Therefore, the resolution of the infrared camera 12 does not need to be particularly high. For example, even if the number of pixels is about 12 million pixels, a sufficient number of measurement points (measurement data) can be used to calculate the bulge volume of the skin surface due to the expansion of the blood vessel by enlarging the bulge near the blood vessel by zooming. ) Can be secured. Therefore, since a camera that is cheaper than a millimeter-wave radar or a laser radar is used, the entire device can be configured at low cost.

(3) The sensor unit 10 further includes an infrared LED 11 (an example of an irradiation unit) that irradiates infrared rays, the infrared camera 12 receives the reflected light of infrared rays emitted by the infrared LED 11, and the measurement area identification unit 32 receives the reflected light of infrared rays. , The blood vessel running (position of the blood vessel) is specified based on the image signal acquired by the infrared camera 12, and the measurement area 320 is specified based on the blood vessel running. Therefore, the measurement area 320 can be specified easily and accurately, and the blood pressure information can be estimated accurately. Further, since an inexpensive infrared light source is used, the entire device can be configured at low cost.

(4) In order to specify the measurement area 320 on at least one of the right side and the left side of the face of the measurement target 200, the measurement area specifying unit 32 turns over and measures the measurement area (photographable area of the infrared camera 12). ) Changes, the blood pressure information can be reliably estimated.

(5) The sensor unit 10 non-contactly acquires distance information to a plurality of measurement points in the measurement area 320 specified by the measurement area identification unit 32, and the distance change amount calculation unit 33 is the measurement area identification unit 32. The bulging volume ΔV of the measurement region 320 is calculated based on the amount of change Δd over time of the distance d to the plurality of measurement points specified by. Therefore, even if the displacement of the measurement region 320 due to the expansion and contraction of the blood vessel is minute, the blood pressure information can be accurately estimated via the bulge volume ΔV which is the integrated value.

(6) The measurement area specifying unit 32 further specifies the position of the skeleton and the reference plane based on the distance information acquired by the sensor unit 10, and the distance change amount calculating unit 33 further specifies the distance acquired by the sensor unit 10. Based on the information and the reference plane, the amount of change Δd over time of the distance d to the measurement point is calculated. That is, since the amount of bulge (bulge height, bulge volume) with respect to the reference plane is calculated, the amount of change due to the movement of the measurement target 200 other than the change due to the expansion and contraction of the blood vessel can be ignored. Therefore, even when the measurement target 200 moves, the blood pressure information can be estimated accurately.

(7) An external device (setting unit) that sets the actually measured systolic blood pressure and diastolic blood pressure (an example of a reference value of blood pressure information) with respect to the amount of change Δd of the distance d calculated by the distance change amount calculation unit 33 with the passage of time. An example) is further provided, and the blood pressure information estimation unit 35 is based on the amount of change Δd over time of the distance d calculated by the distance change amount calculation unit 33, and the systolic blood pressure and diastolic blood pressure set by an external device. The blood pressure information of the measurement target 200 is estimated. This makes it possible not only to monitor relative fluctuations in blood pressure, but also to estimate the absolute value of blood pressure. Further, if the blood pressure in the time zone when the blood pressure fluctuation becomes large is actually measured and the blood pressure value at that time is calibrated, the estimation accuracy of the blood pressure information can be improved.

(8) Since the blood pressure information includes the pulse pressure, systolic blood pressure, and diastolic blood pressure of the measurement target 200, it is easy to compare with the values measured by other measuring devices and to use it as a barometer of the health condition.

In the above embodiment, an external device such as a personal computer or a smartphone is used as a setting unit, and measurement start and end of the blood pressure information estimation device 100, various settings and setting changes such as zoom magnification and zoom range, input of reference values, and blood pressure information. It was configured to display. However, such a configuration is simply for simplifying the configuration of the blood pressure information estimation device 100 main body as much as possible. Therefore, there is no problem even if the blood pressure information estimation device 100 is provided with a setting unit, a display, or the like to display various settings and blood pressure information without going through an external device. That is, the setting unit may be provided in a device other than the external device (for example, the main body of the blood pressure information estimation device 100).

The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications as long as the features of the present invention are not impaired. The components of the above embodiments and modifications include those that are replaceable and self-explanatory while maintaining the identity of the invention. That is, other forms that can be considered within the scope of the technical idea of the present invention are also included within the scope of the present invention. Moreover, it is also possible to arbitrarily combine one or more of the above-described embodiment and the modified example.

10 sensor unit, 11 infrared LED, 12 infrared camera, 30 control unit, 31 sensor control unit, 32 measurement area identification unit, 33 distance change amount calculation unit, 34 communication control unit, 35 blood pressure information estimation unit, 100 blood pressure information estimation device , 200 measurement target, 320 measurement area

Claims (6)

A measurement area specifying part that specifies a measurement area on the surface of the living body that covers the blood vessel, which is displaced as the blood vessel of the living body expands or contracts at a predetermined site
A sensor unit that non-contactly acquires distance information to a plurality of measurement points in the measurement region with the biological surface at the time of vasoconstriction specified by the measurement region identification unit as a reference plane.
Based on the distance information acquired by the sensor unit, the amount of change in the distance to the plurality of measurement points with the passage of time is calculated, and the calculated amount of change in the distance to the plurality of measurement points with the passage of time is calculated. The distance change amount calculation unit that calculates the bulge volume of the measurement region based on
A setting unit for setting a reference value of blood pressure information for a bulging volume of the measurement region calculated by the distance change amount calculation unit, and a setting unit.
It is characterized by including a blood pressure information estimation unit that estimates the blood pressure information of a living body based on the bulging volume of the measurement region calculated by the distance change amount calculation unit and the reference value set by the setting unit. Blood pressure information estimation device. In the blood pressure information estimation device according to claim 1,
The sensor unit is a blood pressure information estimation device including a camera including a zoom lens. In the blood pressure information estimation device according to claim 2,
The sensor unit further includes an irradiation unit that irradiates infrared rays.
The camera receives the infrared reflected light emitted by the irradiation unit and receives the reflected light.
The measurement area specifying unit is a blood pressure information estimation device, characterized in that the position of a blood vessel is specified based on an image signal acquired by the camera, and the measurement area is specified based on the position of the blood vessel. In the blood pressure information estimation device according to any one of claims 1 to 3.
A blood pressure information estimation device characterized in that the predetermined site is at least one of the right side and the left side of the face of a living body. In the blood pressure information estimation device according to claim 4,
The predetermined site is a blood pressure information estimation device characterized in that the blood vessel runs on the surface layer portion and the skull is located immediately below the blood vessel. In the blood pressure information estimation device according to any one of claims 1 to 5.
The blood pressure information estimation device is characterized in that the blood pressure information includes a pulse pressure, a systolic blood pressure, and a diastolic blood pressure of a living body.

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