JP2008079676A - Blood flow sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact blood flow sensor having excellent measurement accuracy. <P>SOLUTION: The blood flow sensor 1 irradiates the subject's finger with light emitted from a light emitting section 11 and measures a value regarding the blood flow of the finger by receiving light diffused by or transmitted through the finger using a light receiving section 17. The light emitting section 11, the light receiving section 17, and a power supply section for supplying power are arranged on a substrate having an aperture 6 to which the finger is inserted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blood flow sensor used in a blood flow measurement device for examining a circulatory system disorder or the like.

  2. Description of the Related Art Conventionally, in a blood flow measuring device used for examining a circulatory system disorder or the like, a blood flow sensor including a light emitting unit such as an LED (light emitting diode) and a light receiving unit such as a phototransistor is used. The blood flow sensor is attached to a part of the body of a subject, irradiates the light of the light emitting part to the part of the body, and receives the light transmitted through the part of the body or the light diffused by the part of the body And detecting a change in the amount of received light as a change in blood flow.

For example, Patent Literature 1 discloses an arm-mounted pulse wave measuring device that can measure a pulse rate during jogging or marathon and that has a blood flow sensor with a size that does not hinder running.
JP-A-8-266493

  However, in the conventional blood flow sensor, the member provided with the light emitting part and the light receiving part and the power feeding part are configured as separate members, and it is necessary to separately attach these members to the subject. In addition, a separate connecting member for electrically connecting the members is necessary and cumbersome. For example, a blood flow sensor described in Patent Document 1 is connected to a wristwatch that functions as an information processing device with a cable, and is supplied with power from a battery built in the wristwatch via the cable. Therefore, the blood flow cannot be measured only by wearing the blood flow sensor alone, and a wristwatch has to be worn to measure the blood flow.

  In addition, for blood flow sensors that detect changes in blood flow by receiving light that has passed through a part of the body, the light-emitting part and the light-receiving part are opposed to each other by a fixture such as a belt. I was wearing it. For this reason, it is difficult to keep the relative positional relationship between the light emitting unit and the light receiving unit constant, and stable measurement accuracy cannot be ensured. In view of the above problems, an object of the present invention is to provide a small blood flow sensor with high measurement accuracy.

  In order to solve the above-mentioned problem, in the invention of claim 1, the light emitted from the light emitting unit is irradiated to the finger of the subject, and the light diffused by the finger or the light transmitted through the finger is received by the light receiving unit. A blood flow sensor for measuring information related to blood flow, wherein the light emitting unit, the light receiving unit, and a power supply unit for supplying power are arranged on a base body having a hole into which a finger can be inserted. It was.

  Thereby, since components, such as the light emission part, the light-receiving part, and the electric power feeding part which comprise a blood flow sensor, are arrange | positioned at one member, it is not necessary to mount | wear a test subject with several members like the conventional blood flow sensor. In addition, since a connection member for electrically connecting the members is not necessary, the number of parts constituting the blood flow sensor can be reduced and the blood flow sensor can be downsized.

  In the blood flow sensor according to claim 1, the base includes a three-dimensional circuit board, and the three-dimensional circuit board has a predetermined circuit pattern formed on a resin molded body, and the light emitting section and the resin molded body The light receiving unit and the power feeding unit may be mounted (Claim 2).

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the light emitting portion and the light receiving portion are arranged to face each other on an inner wall constituting the hole. Thereby, the relative positional relationship between the light emitting unit and the light receiving unit can be fixed. For this reason, the blood flow sensor according to the invention of claim 3 does not change the relative positional relationship between the light emitting unit and the light receiving unit unlike the conventional blood flow sensor, and can ensure stable measurement accuracy. .

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a radio transmitter is disposed on the base, and information relating to light detected by the light receiving unit by the radio transmitter is blood. The information is transmitted to an information processing device that calculates information about the flow. Thereby, the blood flow sensor and the information processing apparatus can be physically separated, and the subject can measure information related to blood flow by wearing only the blood flow sensor. Therefore, the blood flow sensor according to the invention of claim 4 is easy to mount without the trouble of mounting a plurality of members on the subject unlike the conventional blood flow sensor.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a sensor for detecting insertion of a finger is disposed on the inner wall constituting the hole, and the insertion of the finger is detected by the sensor. It was started on condition that Accordingly, the blood flow sensor can be activated by inserting a finger into the hole of the blood flow sensor. As a result, it is possible to prevent the switch from being forgotten, so there is no risk of neglecting the measurement. When the blood flow sensor is removed from the finger, the blood flow sensor stops because the insertion of the finger is not detected by the sensor. As a result, forgetting to turn off the switch can be prevented, so that power consumption can be suppressed.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the power supply unit includes a capacitor circuit and a power supply circuit that charges the capacitor circuit in a non-contact manner with the charger. It was characterized by that. For this reason, the blood flow sensor according to the invention of claim 6 does not need to be provided with a battery holder that accommodates the battery, unlike the conventional blood flow sensor, so that the size of the blood flow sensor can be further reduced. . In addition, since the appearance of the blood flow sensor can be made simple with no protrusions, the aesthetics of the blood flow sensor can be improved.

  According to the present invention, it is possible to provide a small blood flow sensor with high measurement accuracy.

(First embodiment)
Next, the blood flow sensor 1 according to the first embodiment of the present invention will be described in detail with reference to the drawings. In the following description, unless otherwise specified, the vertical positional relationship is based on a normal installation state as illustrated, and the horizontal positional relationship is the direction in which the finger is inserted into the blood flow sensor 1. The standard.

  FIG. 1 is an explanatory diagram showing a use state of the blood flow sensor 1 according to the first embodiment, and FIG. 2A is a plan view of the blood flow sensor 1 according to the present embodiment, and FIG. ) Is a front view of the blood flow sensor 1 according to the present embodiment, FIG. 2C is a side view of the blood flow sensor 1 according to the present embodiment, and FIG. 3A is related to the present embodiment. It is AA sectional drawing of the blood flow sensor 1, FIG.3 (b) is BB sectional drawing of the blood flow sensor 1 which concerns on this embodiment, FIG.3 (c) concerns on this embodiment. It is CC sectional drawing of the blood-flow sensor 1, FIG.3 (d) is DD sectional drawing of the blood-flow sensor 1 which concerns on this embodiment.

  The blood flow sensor 1 is used for inspecting a circulatory system disorder or the like, and as shown in FIG. 1, is attached to a subject's finger to optically measure a change in blood flow. . For this reason, as shown in FIG. 2, an insertion hole 4 for inserting and attaching a finger is provided in the center of the blood flow sensor 1. Information on blood flow measured by the blood flow sensor 1 is transmitted by wireless communication to an information processing apparatus such as a PDA (Personal Digital Assistants) (not shown), and the PDA uses a predetermined analysis software to measure blood flow volume, acceleration pulse wave, etc. Information regarding blood flow is calculated.

  As shown in FIG. 3, the blood flow sensor 1 according to the present embodiment includes a light emitting unit 11, a light receiving unit 17, a battery holder 22, a wireless transmitter 23, an activation ultrasonic sensor 25, and a control IC 26 (Integrated Circuit). The provided three-dimensional circuit board 3 is housed in a housing 8. The three-dimensional circuit board 3 according to the present embodiment is configured by forming a predetermined circuit pattern on the resin molded body 9 and mounting the light emitting unit 11, the light receiving unit 17, and the battery holder 22 on the resin molded body 9. The resin molded body 9 is formed of PEEK (polyetherethertone) resin in which about 10 to 40% of glass fiber is blended, and desirably about 30% of glass fiber is blended.

  As shown in FIG. 3B, the resin molded body 9 is roughly divided into an attachment portion 5 attached to a finger and a battery accommodation portion 10 in which a battery (not shown) as a power source is accommodated. The mounting portion 5 is formed in an annular shape like a ring, and has a hole 6 at the center where a finger can be inserted. The battery accommodating portion 10 is a box, and a hole corresponding to the size of the button battery is provided as a battery holder 22 on the upper surface thereof. In the present embodiment, a hole having a size corresponding to the RL41 type button battery is provided.

  Two battery holders 22 are provided in the battery housing part 10 according to the present embodiment, and as shown in FIG. 6A, a battery holder that connects button batteries housed in the two battery holders 22 in series. The circuit 27 (power feeding unit) is disposed in the battery housing unit 10 of the resin molded body 9. In addition, a lid 15 is fitted into the upper part of the battery holder 22 to prevent the battery from falling off. Further, the lower surface of the battery housing part 10 is formed so as to be integrated with the outer peripheral part of the mounting part 5.

  The light emitting unit 11 uses an LED (Light Emitting Diode), and the blood flow sensor 1 according to the present embodiment includes a near infrared LED 12 having a peak wavelength of 850 nm and a red LED 13 having a peak wavelength of 644 nm. Yes. In addition, a photodiode is used for the light receiving unit 17, and the blood flow sensor 1 according to the present embodiment can detect a near-infrared photodiode 18 that can detect near-infrared light and visible light that can detect visible light. And a photo diode 19.

  As shown in FIG. 3B, the light emitting unit 11 and the light receiving unit 17 are arranged so as to face each other on the inner wall 7 constituting the hole 6 in the mounting portion 5 of the resin molded body 9, and this embodiment In the blood flow sensor 1 according to the above, the light emitting unit 11 and the light receiving unit 17 are in a position that is point-symmetric with respect to the center of the hole 6 of the mounting unit 5. The near infrared LED 12 and the near infrared photodiode 18 face each other, and the red LED 13 and the visible light photodiode 19 face each other.

  The near-infrared LED 12 and the red LED 13 constituting the light emitting unit 11 are arranged side by side, and a near-infrared photodiode 18 and a visible light photodiode 19 are also arranged side by side correspondingly. The start-up ultrasonic sensor 25 detects an object by emitting an ultrasonic wave from a transmitter and receiving a reflected wave by a receiver, and is mounted similarly to the light emitting unit 11 and the receiving unit 17. It is arranged on the inner wall 7 constituting the hole 6 of the part 5.

  As shown in FIG. 2A, information relating to light received by the light receiving unit 17 is transmitted to the PDA at a position sandwiched between two battery holders 22 on the upper surface of the battery accommodating unit 10 of the resin molded body 9. And a control IC 26 for controlling the operation of the blood flow sensor 1 are disposed on the left and right side surfaces of the battery housing unit 10.

  FIG. 4 is a hexahedral view of the three-dimensional circuit board 3 according to the present embodiment, and FIGS. 5 to 7 are cross-sectional views of the three-dimensional circuit board 3 according to the present embodiment. For example, circuit patterns as shown in FIGS. 4 to 7 are formed on the surface of the resin molded body 9 constituting the three-dimensional circuit board 3, and the light emitting unit 11 and the light receiving unit 17 mounted on the resin molded body 9. Each of the wireless transmitter 23, the start-up ultrasonic sensor 25, and the battery holder circuit 27 is connected to the control IC 26. The molded circuit board 3 is entirely covered with a resin housing 8, and a transparent member capable of transmitting light is disposed at a position corresponding to the light emitting unit 11 and the light receiving unit 17 of the housing 8. .

  In the blood flow sensor 1 according to the present embodiment, each component such as the light emitting unit 11 constituting the blood flow sensor 1 is arranged on one solid circuit board 3. Therefore, since components such as the light emitting unit 11 and the light receiving unit 17 constituting the blood flow sensor 1 are arranged as one member, it is not necessary to attach a plurality of members to the subject unlike the conventional blood flow sensor. In addition, since a connecting member for connecting the members is not necessary, the number of components constituting the blood flow sensor can be reduced and the size can be reduced.

  In the blood flow sensor 1 according to the present embodiment, the light emitting unit 11 and the light receiving unit 17 are disposed on the inner wall 7 of the hole 6 of the three-dimensional circuit board 3, and the relative positions of the light emitting unit 11 and the light receiving unit 17 are arranged. The relationship is fixed. Therefore, the blood flow sensor 1 according to the present embodiment ensures stable measurement accuracy without changing the relative positional relationship between the light emitting unit 11 and the light receiving unit 17 unlike the conventional blood flow sensor. Can do. Further, unlike the conventional blood flow sensor, it does not take time and effort to fix the light emitting unit 11 and the light receiving unit 17 with a band or the like, and as shown in FIG. The blood flow sensor 1 can be easily attached to the subject simply by making it.

  Furthermore, the radio transmitter 23 is mounted on the three-dimensional circuit board 3 according to the present embodiment. For this reason, the information regarding the light received by the light receiving unit 17 can be transmitted to the information processing apparatus such as a PDA by the wireless transmitter 23. As a result, the blood flow sensor 1 and the information processing apparatus can be physically separated, and the subject can measure information related to the blood flow by wearing only the blood flow sensor 1. The blood flow sensor 1 according to the method does not have the trouble of attaching a plurality of members to the subject unlike the conventional blood flow sensor.

  In the blood flow sensor 1 according to the embodiment, an ultrasonic sensor is used to detect insertion of a finger and activate the blood flow sensor 1. However, instead of the ultrasonic sensor, a sensor that detects heat or pressure is used. It may be used. Further, the blood flow sensor 1 according to the above embodiment has the activation ultrasonic sensor 25 disposed in the hole 6 in the mounting portion 5 of the three-dimensional circuit board 3, and blood is inserted when the subject's finger is inserted into the hole 6. Although the flow sensor 1 is activated, the present invention is not limited to such a configuration. For example, as shown in FIGS. 8 to 13, an activation sensor switch 30 capable of detecting heat, pressure, or the like is arranged on the upper surface of the battery housing portion 10 of the three-dimensional circuit board 3, so that the blood flow sensor 1 is a subject's finger. After mounting, the blood flow sensor 1 may be activated by touching the activation sensor switch 30 with a finger or the like.

(Second embodiment)
Next, a second embodiment will be described. In the present embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and only different portions are described. 14A is a plan view of the blood flow sensor 31 according to the present embodiment, FIG. 14B is a front view of the blood flow sensor 31 according to the present embodiment, and FIG. It is a side view of blood flow sensor 31 concerning an embodiment, Drawing 15 (a) is an AA sectional view of blood flow sensor 31 concerning this embodiment, and Drawing 15 (b) is this embodiment. FIG. 15C is a cross-sectional view of the blood flow sensor 31 according to the present embodiment, and FIG. 15D is a cross-sectional view of the blood flow sensor 31 according to the present embodiment. It is DD sectional drawing of the blood-flow sensor 31 which concerns.

  As shown in FIG. 15B, the resin molded body 40 constituting the three-dimensional circuit board 33 according to the present embodiment is an annular shape having a hole 34 into which a finger can be inserted at the center, and has a ring-like shape. is there. As shown in FIG. 19A, a copper foil 37 is installed along the outer periphery of a part of the outer peripheral portion of the resin molded body 40. Then, as shown in FIG. 19B, a dielectric film 38 is formed by screen printing a dielectric on the copper foil 37. As shown in FIG. 19C, the dielectric film 38 is formed on the dielectric film 38. By performing electrolytic copper plating, a copper film 39 is formed, and a capacitor circuit 36 is formed on a part of the outer peripheral portion of the resin molded body 40.

  14A and 15B, the outer periphery of the resin molded body 40 is not connected to a charger (not shown) without a contact such as a metal part other than the capacitor circuit 36. A power feeding circuit 41 for charging the capacitor circuit 36 by contact is disposed, and the radio transmitter 23 is disposed at a position sandwiched between the power feeding circuits 41. As shown in FIG. 15, the inner wall 35 constituting the hole 34 of the resin molded body 40 has the light emitting unit 11, the light receiving unit 17, and the activation ultrasonic sensor 25 as in the blood flow sensor 1 according to the first embodiment. Are arranged respectively. In the blood flow sensor 31 according to the present embodiment, a control IC 26 for controlling the operation of the blood flow sensor 31 is also disposed on the inner wall 35 of the resin molded body 40.

  As shown in FIGS. 16 to 18, a circuit for connecting the capacitor circuit 36 and the power feeding circuit 41, and the light emitting unit 11, the light receiving unit 17, the wireless transmitter 23, the activation ultrasonic sensor 25, and the capacitor circuit. 36. A circuit for connecting each of the power supply circuit 41 and the control IC 26 is formed on the surface of the resin molded body 40. Charging is performed on the capacitor circuit 36 of the blood flow sensor 31 by the charger via the power supply circuit 41, and power for operating the blood flow sensor 31 is supplied from the capacitor circuit 36.

  Similarly to the blood flow sensor 1 according to the first embodiment, when the subject's finger is inserted into the insertion hole 4 of the blood flow sensor 31, the activation ultrasonic sensor 25 mounted on the three-dimensional circuit board 33 causes the finger to move. Is detected and the blood flow sensor 31 is activated. The blood flow sensor 31 causes the light emitting unit 11 to emit light and irradiate the finger with light, and the light receiving unit 17 receives the light transmitted through the finger. Information regarding the change in the amount of received light received by the light receiving unit 17 is transmitted to the PDA by the wireless transmitter 23, and the PDA calculates blood flow, acceleration pulse wave, and the like using predetermined analysis software.

  Since the blood flow sensor 31 according to the present embodiment can be operated by the electric power stored in the capacitor circuit 36 formed in the resin molded body 40, a battery holder for housing the battery is provided in the resin molded body 40. There is no need. For this reason, the blood flow sensor 31 can be reduced in size, and the appearance of the blood flow sensor 31 can be simplified without protrusions.

  In the blood flow sensors 1 and 31 according to the first embodiment and the second embodiment, information related to the light measured by the light receiving unit 17 is transmitted to the information processing apparatus such as a PDA by the wireless transmitter 23. However, information may be transmitted by wire such as a cable as the information transmitting means. In addition, the blood flow sensors 1 and 31 according to the first embodiment and the second embodiment are configured using the one three-dimensional circuit boards 3 and 33 as a base body, but the present invention is not limited to such a configuration. For example, the blood flow sensor may be configured by mounting all the components except the light emitting unit 11 on one substrate, and joining the other member to which the light emitting unit 11 is attached and the substrate. In this case, the combination of the component mounted on the substrate and the component attached to another member is not limited.

It is explanatory drawing which shows the use condition of the blood-flow sensor which concerns on 1st embodiment. (A) is a top view of the blood flow sensor which concerns on 1st embodiment, (b) is a front view of the blood flow sensor which concerns on 1st embodiment, (c) The blood which concerns on 1st embodiment It is a side view of a flow sensor. (A) is AA sectional drawing of the blood-flow sensor which concerns on 1st embodiment, (b) is BB sectional drawing of the blood-flow sensor which concerns on 1st embodiment, (c) is FIG. 3 is a cross-sectional view of the blood flow sensor according to the first embodiment, taken along the line CC, and FIG. 4D is a cross-sectional view of the blood flow sensor according to the first embodiment, taken along the line DD. (A) is a top view of the molded circuit board which concerns on 1st embodiment, (b) is a left view of the molded circuit board which concerns on 1st embodiment, (c) is 1st embodiment. It is a front view of the three-dimensional circuit board which concerns on this, (d) is a right view of the three-dimensional circuit board which concerns on 1st embodiment, (e) is a rear view of the three-dimensional circuit board which concerns on 1st embodiment. is there. (A) is AA sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment, (b) is BB sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment. (A) is CC sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment, (b) is DD sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment. (A) is EE sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment, (b) is FF sectional drawing of the three-dimensional circuit board which concerns on 1st embodiment. (A) is a top view of the blood flow sensor which concerns on the modification of 1st embodiment, (b) is a front view of the blood flow sensor which concerns on the modification of 1st embodiment, (c) 1st It is a side view of the blood-flow sensor which concerns on the modification of one Embodiment. (A) is AA sectional drawing of the blood-flow sensor which concerns on the modification of 1st embodiment, (b) is BB sectional drawing of the blood-flow sensor which concerns on the modification of 1st embodiment. (C) is CC sectional drawing of the blood flow sensor which concerns on the modification of 1st embodiment, (d) is DD cross section of the blood flow sensor which concerns on the modification of 1st embodiment. FIG. (A) is a top view of the molded circuit board which concerns on the modification of 1st embodiment, (b) is the left view of the molded circuit board which concerns on the modification of 1st embodiment, (c) These are the front views of the three-dimensional circuit board which concerns on the modification of 1st embodiment, (d) is the right view of the three-dimensional circuit board which concerns on the modification of 1st embodiment, (e) It is a rear view of the three-dimensional circuit board which concerns on the modification of one Embodiment. (A) is AA sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment, (b) is BB sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment. is there. (A) is CC sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment, (b) is DD sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment. is there. (A) is EE sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment, (b) is FF sectional drawing of the three-dimensional circuit board which concerns on the modification of 1st embodiment. is there. (A) is a top view of the blood flow sensor which concerns on 2nd embodiment, (b) is a front view of the blood flow sensor which concerns on 2nd embodiment, (c) The blood which concerns on 2nd embodiment It is a side view of a flow sensor. (A) is AA sectional drawing of the blood flow sensor which concerns on 2nd embodiment, (b) is BB sectional drawing of the blood flow sensor which concerns on 2nd embodiment, (c) is FIG. 4 is a cross-sectional view of the blood flow sensor according to the second embodiment, taken along the line CC, and FIG. 4D is a cross-sectional view of the blood flow sensor according to the second embodiment, taken along the line DD. (A) is a top view of the molded circuit board which concerns on 2nd embodiment, (b) is a left view of the molded circuit board which concerns on 2nd embodiment, (c) is 2nd embodiment. It is a front view of the 3D circuit board which concerns on this, (d) is a right view of the 3D circuit board which concerns on 2nd embodiment, (e) is a rear view of the 3D circuit board which concerns on 2nd embodiment. is there. (A) is AA sectional drawing of the 3D circuit board based on 2nd embodiment, (b) is BB sectional drawing of the 3D circuit board concerning 2nd embodiment, (c) is FIG. 4C is a cross-sectional view taken along the line CC of the molded circuit board according to the second embodiment, and FIG. 4D is a cross-sectional view taken along the line DD of the molded circuit board according to the second embodiment. It is EE sectional drawing of the three-dimensional circuit board which concerns on 2nd embodiment. It is explanatory drawing which shows the manufacturing process of a capacitor circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31 Blood flow sensor 3,33 3D circuit board 6 Hole 7 Inner wall 9 Resin molding 11 Light emission part 17 Light reception part 23 Wireless transmitter 25 Starting ultrasonic sensor 27 Battery holder circuit 36 Capacitor circuit 41 Feeding circuit

Claims (6)

  A blood flow sensor that measures information related to blood flow of a finger by irradiating a finger of a subject with light emitted from a light emitting unit and receiving light diffused by the finger or transmitted through the finger with a light receiving unit, A blood flow sensor comprising: a base having a hole into which a finger can be inserted; and the light emitting unit, the light receiving unit, and a power feeding unit that supplies power.   The base includes a three-dimensional circuit board, and the three-dimensional circuit board is configured by forming a predetermined circuit pattern on a resin molded body, and mounting the light emitting unit, the light receiving unit, and a power feeding unit on the resin molded body. The blood flow sensor according to claim 1.   The blood flow sensor according to claim 1 or 2, wherein the light emitting portion and the light receiving portion are arranged to face each other on an inner wall constituting the hole.   A wireless transmitter is disposed on the base, and information on light detected by the light receiving unit by the wireless transmitter is transmitted to an information processing apparatus that calculates information on blood flow. The blood flow sensor according to any one of 3.   The sensor which detects insertion of a finger is arrange | positioned in the inner wall which comprises the said hole, and it starts on the conditions that insertion of a finger is detected by the said sensor, It is any one of Claims 1-4 characterized by the above-mentioned. The blood flow sensor described in 1.   The blood flow sensor according to any one of claims 1 to 5, wherein the power supply unit includes a capacitor circuit and a power supply circuit that charges the capacitor circuit in a non-contact manner with a charger.

Images