JP2007054606A - Biological signal detecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological signal detecting apparatus, detecting a biological signal with better accuracy without any load on a living body as compared with the case of disposing a sensor directly on a living body holding part. <P>SOLUTION: This biological signal detecting apparatus includes: a living body holding part 4 for holding a living body; a base for placing the living body holding part 4; a pressure transmitting part 1 having flexibility to receive a pressure change caused by the living body; a sensor part 2 fitted to the pressure transmitting part 1 for detecting a received pressure change; and a biological signal detecting part for detecting a biological signal from the output signal of the sensor part 2, wherein the pressure transmitting part 1 is disposed in a space up to the living body holding part 4 or the base 5 with a gap. Thus, the displacement of the sensor part 2 caused by the living body is not limited, so that the sensor part 2 detects the pressure change propagated from the living body holding part 4 with better accuracy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a biological signal detection apparatus that detects biological signals such as heartbeat, respiration, and body movement.

In recent years, an apparatus for detecting various states of a living body during sleep has been developed. For example, as shown in Patent Document 1, a sleep depth can be estimated with high accuracy without restricting a sleeper. An estimation device is known. This sleep depth estimation device is a biological information sensor that detects biological information including the heart rate and respiratory rate of a human body, and performs a predetermined process on the biological information detected by the biological information sensor to obtain a plurality of sleep depth basic data. It comprises a biological information processing circuit to be calculated and a sleep depth estimation circuit that estimates the sleep depth based on the sleep depth basic data obtained from the biological information processing circuit. Moreover, for example, as disclosed in Patent Document 2, it is possible to accurately measure respiratory information, pulse information, etc., among various biological information of the subject, and to wear on a commercially available bed. A biological information measuring panel, a biological information measuring mat, a biological information measuring device, a biological information measuring method, and a living body capable of reliably monitoring the state of respiration and pulse among various biological activities of a subject. There is known a life activity monitoring system including an information measurement panel or a biological information measurement mat.
JP 2003-260040 A JP 2006-43445 A

  In the sleep depth estimating apparatus disclosed in Patent Document 1, measurement is performed by attaching a pressure sensor to a mattress or a hanging quilt or clothing. When attached to a mattress or clothing, there is a problem of placing a burden on the living body, and when a sensor is attached to the comforter, the comforter may be removed while sleeping, Not suitable for measurement. Moreover, in the biological information measurement panel disclosed in Patent Document 2, a strain detection sensor is attached to an elastically bendable floor plate. In this biological information measurement panel, at least one of the upper and lower surfaces of the floor plate portion is provided with an elastic layer on at least one of the upper and lower surfaces of the floor plate portion, and a thin portion having a thickness thinner than other portions of the floor plate portion. The surface of the bed has been devised, such as providing a recess, but the sensor and the floorboard are placed on the living body when a load is placed on the bed mattress top surface, tatami mat surface, floor surface, mattress top surface, etc. The displacement is limited by contact with a mattress or the like, and the detection accuracy may be lowered.

  The present invention solves the above-mentioned problem, and attaches a sensor capable of detecting a pressure change caused by a living body to a flexible pressure transmission unit and arranges the sensor with a gap with respect to the living body holding unit. Thus, an object of the present invention is to provide a biological signal detection device capable of detecting a biological signal with higher accuracy than in the case where the sensor is directly disposed on the biological holding unit without imposing a burden on the biological body. .

  In order to achieve the above object, the present invention provides a living body holding section that holds a living body, a base on which the living body holding section is placed, a flexible pressure transmission section that receives a pressure change caused by the living body, A sensor unit that is attached to the pressure transmission unit and detects a pressure change received by the pressure transmission unit; and a biological signal detection unit that detects a biological signal from an output signal from the sensor unit, the pressure transmission unit comprising: The biological signal detection device is disposed with a gap between the pressure transmission unit and the biological holding unit or the base.

The pressure transmission unit is plate-shaped and includes support members at both ends in the surface direction, and the presence of the support members forms a gap between the pressure transmission unit and the living body holding unit or the base. It should be.
Moreover, the said supporting member should just be integrated with the said pressure transmission part.
The pressure transmission unit may hold the sensor unit and be attached to the living body holding unit.
The pressure transmission unit may be configured to hold the sensor unit at substantially the center thereof.
The pressure transmission unit holds the sensor unit on the lower surface side, and has a second support member lower than the height of the support member in the vicinity of the sensor unit, and due to the presence of the second support member, Even when a load due to a living body is applied to the pressure transmitting unit, a gap between the living body holding unit or the base may be maintained.
In addition, the pressure transmission unit may be made of a material and a shape that are not damaged when a maximum bending stress is generated due to an overload by a living body.
Further, the pressure transmission unit may be disposed with a height that is greater than or equal to the maximum amount of bending that occurs when the living body is overloaded with respect to the base.
The support member may be made of an elastic body.
Moreover, what is necessary is just to let the both ends of the said support member be arrange | positioned on the elastic body.
Further, the support member may have a plate-like portion in contact with the elastic body and be parallel to the pressure transmission unit.
Moreover, the said supporting member should just be arrange | positioned on a plate-shaped floor board.

  According to the biological signal detection device of the present invention, the flexible pressure transmitting unit with the sensor unit attached is disposed with a gap between the biological holding unit or the base. Compared with the case where the sensor unit is directly disposed between the living body holding unit and the base, the displacement of the sensor unit due to the living body is not limited, and the sensor unit can more accurately detect the pressure change propagated from the living body holding unit. Can be detected. In addition, the biological signal can be detected with high accuracy without imposing a burden on the living body.

Further, by supporting both ends of the pressure transmission unit with the support members, a gap is maintained between the pressure transmission unit and the base, the output voltage of the sensor unit increases, and a more accurate biological signal detection becomes possible.
Also, by integrating the pressure transmission part and the support members that support both ends of the pressure part, the output voltage of the sensor part increases, enabling more accurate detection of biological signals, and at the same time, the structure is simple and easy to handle. The pressure transmission part can be manufactured with a single material.
Further, by providing a gap between the base and the living body holding unit, the sensor output voltage is increased, and the heartbeat can be detected with high accuracy.
In addition, since a deflection occurs most when a load due to a living body is applied to the approximate center of the pressure transmission unit, a biological signal can be detected with high accuracy.
In addition, since the pressure transmitting portion has the second support member, even when an excessive load is applied by the living body, the deflection of the pressure transmitting portion can be kept within a certain value, and the durability of the pressure transmitting portion is improved. To do.
Further, by using a material and a shape in which a bending stress generated when an excessive weight due to a living body is applied to the pressure transmission unit is within an allowable bending stress, it is possible to prevent the pressure transmission unit from being damaged, that is, plastic deformation or fracture.
In addition, by using a support member having a height that is greater than the maximum amount of bending that occurs when excessive weight from the living body is applied to the pressure transmission unit, the pressure transmission unit can be bent and contact the bottom even when a load from the living body is applied. Since the gap between the pressure transmission unit and the living body holding unit or the base is secured, the sensor output voltage is maintained and the biological signal detection with high accuracy is possible.
In addition, since both ends of the pressure transmission unit are supported by the support member made of an elastic body, the portion supported by the support member moves greatly, the sensor output voltage increases, and the heartbeat can be detected with high accuracy. It becomes.
In addition, since both ends of the support member integrated with the pressure transmission unit are supported by the elastic body, the portion supported by the elastic body moves greatly, the sensor output voltage increases, and the heartbeat is detected with high accuracy. It becomes possible. Further, if both ends of the support member are press-fitted into the elastic body, the support can be stabilized.
In addition, since the portion of the support member that comes into contact with the elastic body is plate-shaped and is parallel to the pressure transmission unit, stable arrangement is possible.
In addition, when the support member is disposed on the floor plate, the cushion and the pressure transmission unit are prevented from coming into contact with each other when the support member is disposed on a soft material such as a cushion. Since a gap with the material is secured, the sensor output voltage is maintained. Furthermore, when both ends of the support member are disposed on the elastic body, and the portion of the support member that contacts the elastic body is plate-shaped and parallel to the pressure transmission portion, the support member can be attached to the floor plate. It becomes easy. In addition, even when placed on a soft material such as a cushion, a large sensor output can be obtained and the heartbeat can be detected with high accuracy.

  Hereinafter, a biological signal detection apparatus according to an embodiment of the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted. FIG. 1A shows a sensor detection unit configuration of the biological signal detection device. The sensor detection unit includes a plate-like flexible pressure transmission unit 1 that receives a pressure change caused by a living body, and a sensor unit that is attached to the pressure transmission unit 1 and detects a pressure change received by the pressure transmission unit 1. 2 and support members 3 provided at both ends in the surface direction of the pressure transmission unit 1. With this support member 3, a gap is formed between the pressure transmission unit 1 and the living body holding unit 4 or the base 5 (see FIGS. 1B and 1C). The sensor unit 2 is attached to a substantially central position on the plane of the pressure transmission unit 1. For example, an iron plate is used as the pressure transmission unit 1, and polyvinylidene fluoride (PVDF), which is a piezoelectric polymer, is used as the sensor unit 2.

  FIGS. 1B and 1C respectively show a premise configuration and an embodiment configuration of the biological signal detection device of the present invention. The biological signal detection device includes a biological holding unit 4 that holds a biological LB, a base 5 on which the biological holding unit 4 is placed, a sensor detection unit, and a biological signal detection unit that detects a biological signal from an output signal from the sensor detection unit. (Not shown). Here, the living body holding unit 4 is a mattress such as a bedding (spring mat), and the base 5 is a bed table. In FIG. 1B, a pressure transmission unit 1 (iron plate or the like) to which the sensor unit 2 of the sensor detection unit is attached is disposed between the mattress 4 and the bed table 5, and the pressure transmission unit 1 comes into contact with the bed table 5. It is a case.

  In FIG. 1C, the pressure transmission unit 1 (iron plate or the like) is disposed with a gap between the pressure transmission unit 1 and the mattress 4 or the bed table 5 by the support member 3. That is, the pressure transmission unit 1 is disposed below the mattress 4, the support member 3 (for example, iron) is disposed between the bed table 5 and the pressure transmission unit 1, and the pressure transmission unit 1 and the bed table 5 This is an embodiment having a gap in between. In this example, the mattress 4 has a recess 4a into which the sensor detection unit is inserted.

  FIG. 2 shows a configuration of a signal transmission system of the biological signal detection apparatus according to the embodiment. In this apparatus, the pressure due to the displacement from the living body LB is transmitted to the sensor section 2 through the bedding such as the mattress 4 as the living body holding section and the pressure transmitting section 1, and the sensor detection output is detected by the living body signal detecting section 20. Is done.

  FIGS. 3 (A) and 3 (B) are sensor output waveforms (upper stage) when the subject (male, weight 64 kg) lies in the center of the bed in each of FIGS. 1 (B) and (C). The electrocardiogram waveform (lower part) measured simultaneously is shown. In the electrocardiogram waveforms on the lower side of FIGS. 3A and 3B, the peak with the largest amplitude is the heartbeat R wave. According to the configuration of the present embodiment shown in FIG. 1C, the output voltage from the sensor unit 2 increases, and the signal component corresponding to the heartbeat R wave becomes clear. For this reason, in this embodiment, as shown in FIG. 3 (B), a clear peak appears in the sensor output after a certain time delay from the heartbeat R wave as compared with FIG. Repeatedly, accurate heart rate detection has been achieved.

  As shown in FIG. 1B, when the sensor unit 2 is disposed directly between the mattress 4 and the bed table 5, the displacement of the sensor due to a change in pressure originating in the living body is limited, which is not desirable. Therefore, in the present embodiment, as shown in FIG. 1C, the support members 3 are provided at both ends in the surface direction of the pressure transmission unit 1, so that a gap is formed between the pressure transmission unit 1 and the bed 5. The iron plate as the pressure transmission unit 1 prevents the iron plate and the sensor unit 2 from coming into contact with the bed 5 even in a state where the iron plate is bent in a state where a load due to the weight of the living body is applied. In the case of an iron plate, the presence or absence of contact due to a load is determined by a combination of width, thickness, height, and the like. For example, an iron plate may be a square with a side of 20 cm, a thickness of 1 mm, and a height of 22 mm. An iron holding member having a weight of 100 mm may be used to place a subject weighing 100 kg on the sensor unit 2 via the mattress 4. It is desirable not to touch. The sensor unit 2 may be attached on the upper side or the lower side of the pressure transmission unit 1.

  Here, PVDF is used as the sensor unit 2 because it has portability, but in addition to PVDF, piezoelectric ceramics such as lithium niobate, barium titanate, and zinc zirconate titanate are used for the piezoelectric element. For example, it may be a substantially rectangular or substantially circular sheet shape, a strip shape, a button shape, or a cable shape. The cable-shaped piezoelectric element is composed of, for example, a long linear center electrode, a piezoelectric body that covers the center electrode, and an outer electrode that covers the piezoelectric body, and is sensitive to any part of the cable. A device is known. In addition to the piezoelectric element, an optical fiber, a strain gauge, a magnetic sensor, or the like can be used as the sensor unit 2. As a principle for detecting the pressure of the sensor unit 2, the optical fiber detects a change in transmission characteristics due to pressure application, and the magnetic sensor detects a magnetic change due to pressure addition. In this way, it has portability, can detect a change in pressure caused by a living body, can be attached to a pressure transmission unit 1 such as an iron plate, and generates an output that generates an electromotive force in the bending direction. Anything with a principle can be adopted.

  The arrangement of the pressure transmission unit 1 is not limited to that arranged between the mattress 4 and the bed table 5 as described above. 4A and 4B show another embodiment. 4A shows a case where the pressure transmission unit 1 is disposed on the mattress 4, and FIG. 4B shows a case where the pressure transmission unit 1 is disposed inside the mattress 4.

  You may integrate the pressure transmission part 1 and the supporting member 3 which supports the both ends. FIG. 5A shows the embodiment, and an iron plate is bent as the pressure transmission unit 6 and the support member 7. The sensor unit 2 is attached to the lower side of the bent iron plate. FIG. 5B shows the arrangement position of the pressure transmission unit 6. Here, an iron plate having a structure of 20 cm square, 1 mm thickness, height 15 mm, and leg 20 mm is used as the pressure transmission unit 6, but the shape of the iron plate is the pressure transmission unit even when a load due to the weight of a living body is applied. 6 and the sensor unit 2 may be any width, thickness, and height that do not contact the bed 5. Here, the position where the pressure transmission unit 6 is disposed is the lower side of the mattress 4, but it may be on the mattress 4 or inside the mattress 4. FIG. 6 shows a sensor output waveform and an electrocardiogram measured in the configuration of FIG.

  7A and 7B show still another embodiment. In any of the embodiments, the pressure transmission unit 1 made of an iron plate to which the sensor unit 2 is attached is attached to the lower side of the mattress 4 and a gap is provided between the mattress 4 and the bed table 5. 7A, the support member 3 is disposed between the mattress 4 and the bed table 5, and in FIG. 7B, the pressure transmission unit 1 attached to the lower side of the mattress 4 is provided in the concave portion of the bed table 5. It is disposed at the place 5a. Here, a 20 cm square and 1 mm thick iron plate was used for the pressure transmission part 1. FIG. 8 shows a sensor output waveform and an electrocardiogram measured in the configuration of FIG.

  FIGS. 9A and 9B show a configuration for mounting the sensor unit 2 to the pressure transmission unit 1 (iron plate), and both illustrate a state in which the pressure transmission unit 1 is bent. FIG. 9A shows an example in which the sensor unit 2 is attached to the surface of the central portion of the pressure transmission unit 1, and FIG. 9B shows an example in which the sensor unit 2 is attached to the peripheral surface of the pressure transmission unit 1. The sensor unit 2 can be attached to any position of the pressure transmission unit 1 that can detect a biological signal.

  10A and 10B show another embodiment of the pressure transmission unit 6 (iron plate). In either case, a second support member 8 made of an elastic member or the like, which is lower than the height of the support members 7 at both ends near the sensor unit 2, is disposed below the pressure transmission unit 6 to which the sensor unit 2 is attached. It is. Thereby, even if the load of the living body is applied and the iron plate is bent, the gap between the iron plate and the bed base 5 is maintained by the presence of the second support member 8. In FIG. 10A, two cylindrical support members 8 are disposed on both sides of the sensor unit 2, but the number and position of the support members 8 are not particularly limited as long as they are below the iron plate. . Moreover, the shape and material of the support member 8 should just be lower than the height of the support member 7 of both ends, and can support the bending of an iron plate when the load by a biological body is added. Further, the support member 8 may be attached to the iron plate or attached to the bed base 5. FIG. 10B shows the second support member 9 formed by bending a part of the iron plate forming the pressure transmission unit 6.

In each of the above embodiments, the pressure transmission unit 1 (6) is designed so that the maximum bending stress when a load from a living body is applied does not exceed the allowable bending stress. Thereby, the damage of the pressure transmission part 1 (6), ie, plastic deformation and a fracture | rupture, can be prevented. Parameters relating to the material and shape of the pressure transmission unit 1 include depth l, width B, Young's modulus E, and plate thickness t. When the load P by the biological is applied to the pressure transmission unit 1 (6), the load omega = P / B per unit length, the section modulus _{M max} = _ωl ^2/8, as the bending moment Z = ^lt 2/6, the maximum The bending stress σ _max = M _max / Z = 3ωl / 4t ² is calculated. Assuming that the allowable bending stress σ _allow , the required plate thickness t is calculated from σ _max <σ _allow as t> (3ωl / 4σ _allow ) ^1/2 . For example, the necessary plate thickness t is calculated with the parameters fixed as l = 100 [mm], B = 100 [mm], and E = 205800 [MPa]. When a load P = 30 [kgf] is applied by the living body, the allowable bending stress σ _allow = 98 [MPa], and therefore σ _max <σ _allow , the necessary thickness t is t> 1.5 [mm ] Is calculated. Here, the depth l, the width B, and the Young's modulus E are fixed to obtain the plate thickness: t, but other parameters may be fixed to obtain the depth l, the width B, the Young's modulus E, and the like.

Furthermore, in each said embodiment, the supporting member 3 (7) is designed so that it may have the height more than the maximum deflection amount when the load by a biological body is added. As a result, even when a load is applied by the living body, the pressure transmission unit 1 (6) is not bent and does not contact the bottom, and a clearance between the pressure transmission unit 1 (6) and the biological body holding unit 4 or the base 5 is secured. Therefore, the sensor output voltage is maintained, and accurate biological signal detection becomes possible. When the load P by the living body is applied to the pressure transmission portion 1 (6) having the depth l, the width B, the Young's modulus E, and the plate thickness t, the load per unit length ω = P / B, and the elastic secondary moment I = lt. ^As 2/12, the maximum deflection amount v _max = 5ωl ⁴ / 384EI = 5ωl ³ / 32Et ³ is calculated. For example, when P = 30 [kgf], l = 100 [mm], B = 100 [mm], E = 205800 [MPa], t = 2 [mm], the required height of the supporting member 3 (7) Is calculated to be 0.28 [mm] or more.

  FIG. 11 shows still another embodiment of the pressure transmission unit 1. Both ends of the pressure transmission unit 1 made of an iron plate to which the sensor unit 2 is attached are supported by an elastic support member 10 made of an elastic body. As a result, the portion supported by the elastic support member 10 moves greatly, the sensor output voltage increases, and the heartbeat can be detected with high accuracy. Here, the shape of the elastic support member 10 is not particularly limited as long as the pressure transmission unit 1 has a height that does not contact the bottom when a load from a living body is applied.

  FIG. 12 shows still another embodiment of the pressure transmission unit 6. Both ends of a support member 7 (formed by bending both ends of the iron plate) integrated with a pressure transmission unit 6 made of an iron plate are disposed on an elastic support member 10 made of an elastic body. As a result, the portion supported by the elastic support member 10 moves greatly, the sensor output voltage increases, and the heartbeat can be detected with high accuracy. Further, if both ends of the support member 7 are press-fitted into the elastic support member 10, the support can be stabilized. Here, the shape of the elastic support member 10 is not particularly limited as long as the pressure transmitting unit 6 has a height that does not contact the bottom when a load is applied by a living body.

  FIGS. 13A and 13B show still another embodiment of the pressure transmission unit 6. In any of the embodiments, the L-shaped leg portion 11 (support member 7) is formed by bending both ends of the pressure transmission portion 6 made of an iron plate, and the leg portion 11 is arranged on the elastic support member 10 made of an elastic body. It is set. That is, both ends of the support member 7 integrated with the pressure transmission unit 1 are disposed on the elastic support member 10, the portion of the support member 7 that contacts the elastic support member 10 is plate-shaped, and the pressure transmission unit 1 and parallel. Thereby, stable arrangement | positioning is attained. In FIG. 13A, an L-shaped leg portion 11 in which the support member 7 is bent outward is disposed on the elastic support member 10, and in FIG. 13B, the support member 7 is bent inward. An L-shaped leg portion 11 is disposed on the elastic support member 10. Here, the shape of the elastic support member 10 and the L-shaped leg portion 11 is not particularly limited as long as the pressure transmission portion 6 has a height that does not contact the bottom when a load is applied by a living body.

  FIG. 14A shows a case where the support member 3 is disposed on a soft material 12 such as a cushion as a comparative example, and FIG. 14B shows a soft cushion or the like supported by the floor plate 13. The case where it arrange | positions on the raw material 12 is shown. As shown in FIG. 14A, when the support member 3 is disposed on a soft material 12 such as a cushion, the soft material 12 such as a cushion comes into contact with the pressure transmission unit 1 and the pressure transmission unit 1 The displacement of is limited. On the other hand, as shown in FIG. 14B, when the support member 3 is supported by the floor plate 13 and disposed on the soft material 12 such as a cushion, the pressure transmitting portion 1 and the soft material such as the cushion are used. 12 is prevented, and a gap between the pressure transmitting portion 1 and a soft material 12 such as a cushion is secured, thereby maintaining the sensor output voltage. In this way, the pressure transmission unit 1 may be disposed on the soft material 12 such as a cushion with the support member 3 supported by the floor plate 13. The material and shape of the floor plate 13 are not particularly in a case where they are pushed and bent by the soft material 12 such as the cushion and do not come into contact with the pressure transmission unit 1 or the support member 3 when disposed on the soft material 12 such as the cushion. It doesn't matter.

  FIGS. 15A and 15B show still another embodiment of the pressure transmission unit 6. In any of the embodiments, an L-shaped leg portion 11 (support member 7) formed by bending both ends of the pressure transmission portion 6 is disposed on the floor plate 13, and the leg portion 11 and the floor plate 13 are fixed with screws. Is. In FIG. 15 (A), a pressure transmission part 6 made of an iron plate having a 25 cm square, a thickness of 1.8 mm, a height of 1 cm, and a leg part 1 of 1 cm, and a floor board 13 made of an iron plate of 25 cm × 27 cm and a thickness of 1.8 mm Is fixed with screws by a fixing member 14 such as a nut and a fixing member 15 such as a screw. In FIG. 15B, a silicon rubber having a hardness of 50 mm and a thickness of 1 mm is provided between the leg portion 11 and the floor plate 13. An elastic support member 10 made of (elastic body) is provided. FIGS. 16A and 16B show sensor output waveforms and electrocardiograms measured in the configurations of FIGS. 15A and 15B, respectively.

  The arrangement position of the sensor unit 2 with respect to the living body has been shown in the above-described various embodiments in the case of the mattress 4 that is the living body support unit. However, the mattress can be reclined as long as the pressure caused by the living body can be detected. As shown in FIGS. 17A and 17B, the present invention may be applied to a chair-type device. Here, 16 is a cushion, 17 is a chair, and the sensor unit 2 may be arranged at the back of the chair 17 (corresponding to the chest of the living body) or the seat (corresponding to the buttocks of the living body). The lower side, the inner side, and the upper side may be used.

  Furthermore, the material and structure of the mattress 4 and the cushion 16 are not limited as long as a pressure change caused by a living body such as a spring or low-resilience urethane arrives at the pressure transmission unit 1 and a biological signal can be detected. Moreover, the mattress 4 and the base 5 may be integrated or a futon. In this case, tatami mats, floors, etc. correspond to the base.

  Moreover, the number of the sensor parts 2 and the pressure transmission parts 1 is not limited to one, For example, as shown in FIG. 18, what was arrange | positioned in the matrix form over the whole surface under the mattress 4 may be sufficient. . The heartbeat can be detected with high accuracy by arranging the body part from the neck to the shoulder so that the detection part of the sensor part 2 overlaps. In addition, any part of the living body may be used for respiration, but the detection part of the sensor unit 2 may be disposed so as to overlap with the living body part from the neck to the buttocks. Although the output waveform of the sensor unit 2 varies depending on the sleeping posture such as the supine, lying down, and lying down of the living body, it is possible to detect biological signals such as heartbeat, respiration, and body movement. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.

(A) is a side view of the sensor detection unit in the biological signal detection device according to the embodiment of the present invention, (B) is a side view when the pressure transmission unit is in contact with the base, which is a premise of the present invention, (C) is a side view when there is a gap between the pressure transmission unit and the base according to the embodiment of the present invention. The block diagram of the signal transmission system of the biological information detection apparatus which concerns on embodiment of this invention. (A), (B) is a figure which shows the sensor output waveform and electrocardiogram which were measured by the structure of FIG.1 (B), (C), respectively. The side view which shows the arrangement | positioning relationship of the sensor detection part of the biological information detection apparatus which concerns on other embodiment of this invention, a mattress, and a bed base. (A) is a perspective view of the pressure transmission part which concerns on other embodiment, (B) is a figure which shows the arrangement | positioning relationship between a mattress and a bed stand at the time of using the same pressure transmission part. The figure which shows the sensor output waveform and electrocardiogram which were measured with the structure of FIG. 5 (B). (A) is a side view when a support member is disposed between a living body holding unit and a base according to still another embodiment, and (B) is a case when a pressure transmission unit is disposed in a recess of the bed base. Side view. The figure which shows the sensor output waveform and electrocardiogram which were measured with the structure of FIG. 7 (A). (A) is a top view and a side view when the sensor unit is attached to the approximate center of the pressure transmission unit, and (B) is a top view and a side view when the sensor unit is attached to other than the approximate center of the pressure transmission unit. (A) is a perspective view when a support member is disposed on the lower side of the pressure transmission portion, a top view and a side view (B) are a perspective view, a top view and a side view when the pressure transmission portion is bent. Furthermore, the side view at the time of supporting the pressure transmission part which concerns on other embodiment with the supporting member which consists of an elastic body. Furthermore, the side view at the time of arrange | positioning the both ends of the support member integrated with the pressure transmission part which concerns on other embodiment on an elastic body. (A) is a side view when an L-shaped leg portion obtained by bending the support member according to another embodiment outward is disposed on the elastic body, and (B) is an L-shape when the support member is bent inward. The side view at the time of arrange | positioning the leg part of a type | mold on an elastic body. (A) is a side view when a support member is disposed on a soft material such as a cushion as a comparative example, and (B) is a case where the support member is supported on a floor plate and disposed on a soft material such as a cushion. Side view. (A) is a side view when the leg part and the floor board which bent the support member which concerns on other embodiment are screw-fixed, (B) is an elastic body between the leg part and the floor board which bent the support member. A side view when fixing them with screws. (A), (B) is a figure which shows the sensor output waveform and electrocardiogram which were measured by the structure of FIG. 15 (A), (B), respectively. The arrangement | positioning relationship of the chair which concerns on other embodiment, a cushion, and a sensor part is shown, (A) is a side view at the time of arrange | positioning a sensor part in a back part, (B) is the case where a sensor part is arrange | positioned in a seat part Side view. Furthermore, the top view which has arrange | positioned several sensor parts and pressure transmission parts in the matrix form on the whole surface under the mattress which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure transmission part 2 Sensor part 3 Support member 4 Living body holding part (mattress)
5 base (bed)
5a Base recess 6 Integrated pressure transmission part 7 Support member 8 Second support member 9 Second support member 10 obtained by bending a part of an iron plate Elastic support member 11 made of an elastic body Bent into an L-shape Leg material 12 Soft material 13 such as cushion 13 Base plate 14 Fixing member 15 such as nut Fixing member 16 such as screw Cushion 17 Chair LB Living body

Claims (12)

A living body holding unit for holding a living body;
A base on which the living body holding unit is placed;
A pressure transmitting unit having flexibility and receiving a pressure change caused by a living body;
A sensor unit attached to the pressure transmission unit for detecting a pressure change received by the pressure transmission unit;
A biological signal detection unit for detecting a biological signal from an output signal from the sensor unit,
The biological signal detection device, wherein the pressure transmission unit is disposed with a gap between the pressure transmission unit and the biological body holding unit or the base.   The pressure transmission unit is plate-shaped and includes support members at both ends in the surface direction, and the presence of this support member forms a gap between the pressure transmission unit and the living body holding unit or the base. The biological signal detection apparatus according to claim 1, wherein   The biological signal detection device according to claim 2, wherein the support member is integrated with the pressure transmission unit.   The biological signal detection device according to claim 1, wherein the pressure transmission unit holds the sensor unit and is attached to the biological holding unit.   The biological signal detection device according to any one of claims 1 to 4, wherein the pressure transmission unit holds the sensor unit at substantially the center thereof.   The pressure transmission unit holds the sensor unit on the lower surface side, and has a second support member lower than the height of the support member in the vicinity of the sensor unit, and due to the presence of the second support member, 5. The gap between the living body holding unit and the base is maintained even when a load is applied to the pressure transmission unit from the living body. 6. Biological signal detection device.   The said pressure transmission part is comprised from the material and shape which do not produce a damage, when the heavy weight adds and the maximum bending stress arises, The structure of any one of Claim 1 thru | or 6 characterized by the above-mentioned. The biological signal detection device described.   The said pressure transmission part is arrange | positioned with respect to the said base with the height more than the maximum amount of bending produced when the heavy weight by a biological body is added. The biological signal detection device according to any one of the above.   The biological signal detection device according to claim 2, wherein the support member is made of an elastic body.   The biological signal detection device according to claim 3, wherein both ends of the support member are disposed on an elastic body.   The biological signal detection device according to claim 10, wherein the support member has a plate-like portion in contact with the elastic body and is parallel to the pressure transmission unit.   The biological signal detection device according to any one of claims 2, 3, 6, 9, 10, and 11, wherein the support member is disposed on a plate-like floor plate.

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