Flow channel plate unit and blood pressure measuring device

Abstract

To provide technology to achieve a low-cost fluid circuit with a small flow channel resistance error.SOLUTION: A flow channel plate unit in which a fluid flow channel is formed and a connection part with a pump and a cuff is provided includes: a first plate member in which a connection part at least with the pump is formed; a second plate member in which a connection part at least with the cuff is formed; a thin film sheet arranged between the first plate member and the second plate member, and provided with one or more orifices; a first thick film sheet arranged between the first plate member and the thin film sheet, and provided with a flow channel for communicating the connection part with the pump of the first plate member with the orifice of the thin film sheet, whose thickness is formed to be larger than that of the thin film sheet; and a second thick film sheet arranged between the second plate member and the thin film sheet, and provided with a flow channel for communicating the connection part with the cuff of the second plate member with the orifice of the thin film sheet, whose thickness is formed to be larger than that of the thin film sheet.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention belongs to the field of healthcare-related technology, and in particular to a blood pressure measuring device and a flow path plate unit used therein. [Background technology]

[0002] As a blood pressure measuring device, for example, a device using an oscillometric method is generally known, which inflates and deflates a cuff wrapped around the upper arm or wrist of a living body, detects the pressure of the cuff with a pressure sensor, and detects a pressure pulse wave to measure blood pressure. In recent years, it has become common for individuals to measure information on their personal body and health (hereinafter also referred to as biological information) such as blood pressure values ​​on a daily basis using measuring devices, and to use the measurement results for health management. For this reason, there is an increasing demand for devices that emphasize portability, and many portable measuring devices have been proposed (for example, Patent Document 1, etc.).

[0003] In such portable devices, a unit in which a flow path is formed inside a plate-shaped member is used. In wearable devices, including blood pressure measuring devices, it is required to make them as small and lightweight as possible to improve the fit of the device, while it is necessary to properly share and discharge the fluid for accurate blood pressure measurement, and it is therefore required to properly (accurately) set the flow path resistance in the flow path.

[0004] As an invention related to such a flow path unit, although it is not related to the field of blood pressure measuring devices, an invention of a microchannel chip used in immunochromatography is known (Patent Document 2). In the invention described in Patent Document 2, a plurality of substrates and film-like members are laminated, a flow path pattern is provided on each layer, and these are joined to form a three-dimensional flow path, and an appropriate flow path resistance is realized by changing the width of the flow path provided in the horizontal direction in the film-like member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-143557 A [Patent Document 2] JP 2003-114229 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the invention described in Patent Document 2, flow path resistance is provided by flow paths arranged in the horizontal plane (XY plane) of the film-like member, so there is a problem that flow path resistance error due to the manufacturing method is large. Flow path resistance error is due to dimensional error of the flow path shape itself, gaps and adhesive material overflow that occur when joining sheets, variation in flow path length due to misalignment of each sheet, etc. It is technically difficult to reduce these with the flow path plate configuration described in Patent Document 2, and even if it is realized, an increase in costs is expected.

[0007] In view of the above problems, an object of the present invention is to provide a technique for realizing a fluid circuit with small flow path resistance error at low cost. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention employs the following configuration. A flow path plate unit in which a flow path for a fluid is formed and a connection part for connecting to a pump and a cuff is provided, A first plate member in which at least a connection portion with the pump is formed; A second plate member in which at least a connection portion with the cuff is formed; a thin film sheet disposed between the first plate member and the second plate member and having one or more orifices; a first thick film sheet disposed between the first plate member and the thin film sheet, the first plate member having a connection with the pump and a flow path communicating with the orifice of the thin film sheet, and having a thickness greater than that of the thin film sheet; a second thick film sheet disposed between the second plate member and the thin film sheet, the second thick film sheet having a flow path that connects the connection portion of the second plate member with the cuff and the orifice of the thin film sheet, and having a thickness greater than that of the thin film sheet; The flow path plate unit has the following features.

[0009] With this configuration, the flow resistance for flow rate (flow velocity) control can be designed as a simple hole (orifice). Also, by separating the thin film sheet layer with the orifice (control flow resistance) from other layers, the flow resistance can be controlled by the performance of the orifice portion, minimizing the effect on the performance of pumps and valves. This makes it possible to realize a flow path plate unit with small error in flow path resistance at low cost.

[0010] The first plate member, the first thick film sheet, the thin film sheet, the second thick film sheet, and the second plate member may be bonded with an adhesive member. Furthermore, the first thick film sheet and the second thick film sheet may be double-sided tape, the first thick film sheet may be bonded to the first plate member on one side and to the thin film sheet on the other side, and the second thick film sheet may be bonded to the second plate member on one side and to the thin film sheet on the other side.

[0011] According to this configuration, the first thick film sheet and the second thick film sheet themselves can also serve as adhesive members, so that thickness errors in the flow path plate unit can be easily suppressed. Also, the first plate member, the first thick film sheet, the thin film sheet, the second thick film sheet, and the second plate member can be easily bonded, which contributes to simplifying assembly.

[0012] The thin film sheet may be a metal sheet in which the orifice is provided, and may be formed to have a smaller area than the first plate member, the second plate member, the first thick film sheet, and the second thick film sheet. With this configuration, the manufacturing cost of the flow path plate unit can be reduced compared to forming the thin film sheet as a sheet with the same area as the other members. When the thin film sheet is made of metal, it can be formed by a method such as laser processing or electroforming depending on the size and shape of the thin film sheet.

[0013] The flow path plate unit may further include a film member disposed between the first plate member and the second plate member, having a thickness similar to that of the thin film sheet and having an opening shaped to accommodate the thin film sheet in a plan view, and the thin film sheet may be disposed in the opening of the film member. With this configuration, even if the thin film sheet is formed to have an area smaller than each of the first plate member, the second plate member, the first thick film sheet, and the second thick film sheet, the total thickness of the layer in which the thin film sheet is disposed can be made similar to that of the thin film sheet. This makes it possible to stabilize the bonding state with adjacent members such as the first and second thick film sheets, thereby reducing the risk of air leakage.

[0014] Moreover, the first thick film sheet and the second thick film sheet are double-sided tapes, a first film sheet disposed between the first thick film sheet and the thin film sheet; a first adhesive sheet disposed between the first film sheet and the thin film sheet; a second film sheet disposed between the second thick film sheet and the thin film sheet; a second adhesive sheet disposed between the second film sheet and the thin film sheet; The flow path plate unit may further include:

[0015] With such a configuration, complex flow path wiring is possible, and the area of ​​the flow path plate unit can be reduced. Also, even if the thin film sheet has an orifice forming portion and a film portion, it is possible to prevent the flow path from being narrowed.

[0016] The orifice may be formed to have a tapered shape that is open on the side where the fluid flows in. With this configuration, the pressure dependency of the flow path resistance caused by the fluid viscosity can be reduced, and the flow rate from low pressure to the cuff can be increased during pressurization (cuff inflation), and air can be prevented from remaining at low pressure during exhaust.

[0017] Furthermore, the first plate member, the first thick film sheet, the thin film sheet, the second thick film sheet, and the second plate member may each have a notch or hole for positioning during bonding, which can reduce positioning errors of each layer.

[0018] The present invention can also be applied to a blood pressure measuring device including the flow path plate unit.

[0019] The present invention can be achieved by combining the above-described configurations and processes as long as no technical contradiction occurs. Effect of the Invention

[0020] According to the present invention, it is possible to provide a technique for realizing a fluid circuit with small flow path resistance error at low cost. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is an external perspective view showing an outline of a blood pressure measuring device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view showing an outline of the blood pressure measuring device according to the embodiment. [Diagram 3] FIG. 3 is an explanatory diagram showing a positional relationship when the blood pressure measurement device according to the embodiment is worn on the wrist. [Figure 4]FIG. 4 is a schematic cross-sectional view of the blood pressure measurement device according to the embodiment when viewed from the side. [Diagram 5] FIG. 5 is a perspective view showing the appearance of the flow path plate unit according to the embodiment. [Figure 6] FIG. 6 is a block diagram illustrating a functional configuration of a blood pressure measuring device according to an embodiment, and an air flow path in a flow path plate unit. [Figure 7] FIG. 7 is an exploded perspective view of the flow path plate unit according to the embodiment. [Figure 8] FIG. 8 is an exploded perspective view of the flow path plate unit according to the embodiment. [Figure 9] FIG. 9 is an explanatory diagram showing the structure of an orifice portion in a flow path plate unit according to the embodiment. [Figure 10] FIG. 10 is an exploded perspective view of a flow path plate unit according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] <Embodiment 1> Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention.

[0023] (Device configuration) FIG. 1 is an external perspective view showing an outline of the configuration of a blood pressure measuring device 1 according to this embodiment. FIG. 2 is a side view showing an outline of the configuration of the blood pressure measuring device 1 according to this embodiment. As shown in FIGS. 1 and 2, the blood pressure measuring device 1 is generally a wristwatch-type wearable device having a main body 10 and a belt part 20, and can measure blood pressure values ​​while being worn on a human wrist T. FIG. 3 shows the positional relationship between the wrist and each component of the blood pressure measuring device 1 when the blood pressure measuring device 1 according to this embodiment is worn on the wrist T.

[0024] 1 and 2, the main body 10 includes a main body housing 11 and a cuff cover 16, which will be described later. The main body housing 11 is provided with a display 12 (such as an organic EL display), operation buttons 13a and 13b, a lug 14, and the like. In this embodiment, the side on which the display 12 is formed is referred to as the front side of the main body housing 11, and the side on which the cuff cover 16 is provided is referred to as the bottom side of the main body housing 11. In the following description, the front side of the main body housing 11 may be referred to as the upper side, and the bottom side of the main body housing 11 may be referred to as the lower side.

[0025] The belt unit 20 includes a belt 21 and a hook-and-loop fastener 25 for fixing the blood pressure measuring device 1 to the wrist T, as well as a pressure cuff 22 for compressing an artery in the wrist T and a sensing cuff 24 for detecting a pressure pulse wave. The connection parts of the pressure cuff 22 and the sensing cuff 24 with the main body housing 11 are covered by a cuff cover 16. The cuff cover 16 protects the connection parts of the pressure cuff 22 and the sensing cuff 24 with the main body housing 11, and also has the function of fixing each cuff to the main body housing 11.

[0026] Fig. 4 is a schematic cross-sectional view of main body housing 11 as viewed from the side, showing an overview of the internal configuration of main body housing 11 of blood pressure measuring device 1. As shown in Fig. 4, a rechargeable battery 91, control board 17, pump 31, valve 32, pressure sensor 33, flow path plate unit 100, etc. are housed inside main body housing 11. Fig. 5 is a perspective view showing a schematic external appearance of flow path plate unit 100.

[0027] The rechargeable battery 91 can be a general-purpose secondary battery such as a lithium ion battery, and can be repeatedly charged by receiving power via a charging terminal (not shown). It is equipped with processors such as a Multimedia Interface Unit (MIU) and memory such as RAM (Random Access Memory).

[0028] The pump 31 is, for example, a piezoelectric pump, electrically connected to the control board 17, compresses air, and supplies it to the pressure cuff 22 and the sensing cuff 24 via the flow path plate unit 100. The valve 32 is connected to a valve connection portion 102 of the flow path plate unit 100 as described later, and releases the air supplied to the pressure cuff 22 to the atmosphere. The valve 32 is electrically connected to the control board 17, and is opened and closed under the control of the processor. The pressure sensor 33 is connected to a sensor connection portion 103 of the flow path plate unit 100, and detects the pressure of the sensing cuff 24 via the air flowing through the flow path formed in the flow path plate unit 100. That is, the pressure sensor 33 is electrically connected to the control board 17, converts the detected pressure into an electric signal, and outputs it to the processor.

[0029] The pressure cuff 22 is connected to a pressure cuff connection part 106 (not shown in FIG. 5) disposed on the underside of the flow path plate unit 100, and is inflated by air sent from the pump 31 to tighten the wrist T of the attachment part, thereby applying external pressure to the artery in the wrist T. The sensing cuff 24 is a fluid bag for detecting the pressure applied to the part compressed by the pressure cuff 22, and is connected to a sensing cuff connection part 107 (not shown in FIG. 5) of the flow path plate unit 100. When a small amount of air is present in the sensing cuff 24, the internal pressure is measured by a pressure sensor. The pressure applied to the compression site is measured by detecting the pressure with the sensor 33.

[0030] (Functional configuration of the device) Next, the functional configuration of the blood pressure measurement device 1 will be described. FIG. 6 is a block diagram showing the functional configuration of the blood pressure measurement device 1 and the air flow path. Note that the thick solid lines in FIG. 6 show the air flow paths through each layer in the flow path plate unit 100. As shown in FIG. 6, the blood pressure measurement device 1 according to this embodiment has each of the functional units, including a control unit 40, a display unit 50, an operation unit 60, a communication unit 70, a storage unit 80, and a power supply unit 90. These functional units are realized by, for example, a processor of a control board 17 reading and executing a program from a memory to control each of the components of the blood pressure measurement device 1.

[0031] The control unit 40 is configured to include a processor (not shown) of the control board 17, and is responsible for controlling the entire blood pressure measuring device 1. Specifically, for example, it controls the pump 31, the valve 32, the pressure sensor 33, etc., and measures blood pressure by a so-called oscillometric method. Since blood pressure measurement by the oscillometric method is a well-known technique, a detailed description thereof will be omitted.

[0032] The display unit 50 includes the display 12 and displays various information such as blood pressure measurement results, menu screens, etc. The operation unit 60 includes operation buttons 13a and 13b and accepts input operations from the user via these buttons.

[0033] The communication unit 70 includes an interface (not shown) for wired or wireless communication, and communicates information with an external device such as an information processing terminal, for example, by BLE communication. Specifically, it transmits information such as measured blood pressure values ​​and pulse rates to the external device, and also receives programs for software updates from the external device and sends them to the control unit 40. The external device is, for example, an information processing terminal such as a smartphone, a tablet terminal, a personal computer, or a smartwatch.

[0034] The storage unit 80 includes a main storage device such as a RAM, and stores various information such as application programs and measured biological information. In addition to the RAM, the storage unit 80 may include a long-term storage medium such as a flash memory. The power supply unit 90 includes a rechargeable battery 91, and functions as a power supply source for each component of the blood pressure measurement device 1.

[0035] (Configuration of flow path plate unit) Next, the details of the configuration of the flow path plate unit 100 and the air flow in the blood pressure measurement device 1 will be described with reference to Fig. 5 to Fig. 9. Fig. 7 and Fig. 8 are exploded perspective views of the flow path plate unit 100, and Fig. 9 is a schematic cross-sectional view of the flow path plate unit 100 showing the structure of an orifice (second orifice 196) described later.

[0036] As shown in FIG. 5, the flow path plate unit 100 is formed in a substantially rectangular plate shape, for example, 40 mm long, 25 mm wide, and 1 mm thick, and is provided with bosses and nozzles for connection to other components of the blood pressure measurement device 1. The upper surface of the flow path plate unit 100 is provided with openings such as a pump connection part 101 connected to the pump 31, a valve connection part 102 connected to the valve 32, a sensor connection part 103 connected to the pressure sensor 33, and an air opening 104. In addition, an opening 108 is provided so as to penetrate near the center of the flow path plate unit 100 in a plan view, in order to avoid interference with components (not shown) housed inside the main body housing 11. In addition, screw insertion holes 109a, 109b, 109c, and 109d are provided near each of the four corners of the rectangle, through which screws used for fixing to the main body housing 11 can be passed. Furthermore, although not shown in FIG. 5, the lower side of flow path plate unit 100 is provided with openings for pressure cuff connection part 106 that connects to pressure cuff 22 and sensing cuff connection part 107 that connects to a sensing cuff.

[0037] 7 and 8, the flow path plate unit 100 is formed by bonding five sheet-like members, namely, a first metal plate 110, a first thick film sheet 130, a thin film sheet 190, a second thick film sheet 140, and a second metal plate 120, in layers arranged in this order from the top. Specifically, the first thick film sheet 130 and the second thick film sheet 140 are each a double-sided tape, and the first thick film sheet 130 is bonded to the first metal plate 110 and the thin film sheet 190, and the second thick film sheet 140 is bonded to the second metal plate 120 and the thin film sheet 190.

[0038] The first metal plate 110 is made of a metal material such as stainless steel, and is provided with a pump connection hole 111 constituting the pump connection portion 101, a valve connection hole 112 constituting the valve connection portion 102, a sensor connection hole 113 constituting the sensor connection portion 103, and an atmosphere connection hole 114 constituting the atmosphere opening 104. As shown in Fig. 8, positioning openings 119a, 119b, 119c, and 119d are provided near the four corners of the first metal plate 110, and function as positioning portions when joining the layers together, and also form screw insertion holes 109a, 109b, 109c, and 109d. The thickness of the first metal plate 110 is, for example, 0.35 mm.

[0039] The first thick film sheet 130 is a double-sided tape having a base material such as an acrylic foam material, and has a first communication flow path 131, which is an opening that branches the air sent from the pump 31 and connects to the flow path of the thin film sheet 190, a valve connection hole 132 that constitutes the air flow path to the valve 32, a sensor connection hole 133 that constitutes the air flow path to the pressure sensor 33, and an air connection hole 134 that constitutes the air flow path to the air opening 104. As shown in FIG. 8, four positioning openings (139a, 139b, 139c, and one not shown in the drawing) are provided near the four corners of the first thick film sheet 130, which function as positioning parts when joining each layer and also constitute screw insertion holes 109a, 109b, 109c, and 109d. The thickness of the first thick film sheet 130 is, for example, 0.15 mm.

[0040] Thin film sheet 190 is formed of a metal such as nickel, and by laser processing or the like, there are formed pressure cuff connection holes 191a and 191b which form an air flow path to pressure cuff 22, valve connection hole 192 which forms an air flow path to valve 32, sensor connection hole 193 which forms an air flow path to pressure sensor 33, and first orifice 195 and second orifice 196 which are openings which function as flow resistance.

[0041] The first orifice 195 is a connection hole that constitutes an air flow path from the first communication flow path 131 of the first thick film sheet 130 to the fifth communication flow path 145 of the second thick film sheet 140 described later. Since the hole diameter of the first orifice 195 is smaller than the width of the first communication flow path 131, the first orifice 195 becomes a flow resistance, and the air flow rate is lower in the flow path after the first orifice 195 than in the flow path before it. The second orifice 196 is a connection hole that constitutes an air flow path from the fourth communication flow path 144 of the second thick film sheet 140 described later to the atmosphere connection hole 134 of the first thick film sheet 130. Since the hole diameter of the second orifice 196 is smaller than the width of the fourth communication flow path 144, the second orifice 196 becomes a flow resistance, and the air flow rate is lower in the flow path after the second orifice 196 than in the flow path before it. The first thick film sheet 130 and the second thick film sheet 140 are formed to be thicker than the thin film sheet 190. As a result, the fluid resistance of the flow paths formed in the first thick film sheet 130 and the second thick film sheet 140 is negligibly small compared to the fluid resistance of the first orifice 195 and the second orifice 196, and the fluid resistance can be set with high accuracy by the hole diameters of the first orifice 195 and the second orifice 196.

[0042] Here, the orifice may be a cylindrical duct, or may be a tapered duct that opens on the side where the air flows in. For example, as shown in FIG. 9, the second orifice 196 is formed in a tapered shape that opens on the second thick film sheet 140 side. The white arrows in FIG. 9 indicate the direction in which the air flows. By forming the orifice in such a tapered shape, it can be processed more easily than a cylindrical shape, and the flow path resistance value can be set by the hole diameter on the narrower diameter side of the orifice. The diameter of the tapered shape is, for example, about 50 μm on the wide diameter side and about 30 μm on the narrow diameter side. By forming a tapered orifice in a thin sheet, the pressure dependency of the flow path resistance caused by the fluid viscosity can be reduced, the flow rate from low pressure to the cuff can be increased when pressurizing, and air can be prevented from remaining at low pressure when exhausting.

[0043] 8, four positioning openings (199a, 199b, 199c, and one not shown in the drawing) are provided near the four corners of the thin film sheet 190, which function as positioning portions when bonding the layers together and form the screw insertion holes 109a, 109b, 109c, and 109d. The thickness of the thin film sheet 190 is, for example, 0.05 mm.

[0044] The second thick film sheet 140 is a double-sided tape having a base material such as an acrylic foam material, and is formed with pressure cuff connection holes 141a and 141b that form a flow path of air toward the pressure cuff 22. The second thick film sheet 140 also has a second communication flow path 142 that connects a pressure cuff connection hole 121c of the second metal plate 120 described below to a valve connection hole 192 of the thin film sheet 190 and serves as a flow path of air exhausted from the pressure cuff 22. The second thick film sheet 140 also has a third communication flow path 143 that connects a sensing cuff connection hole 122b of the second metal plate 120 described below to a sensor connection hole 193 of the thin film sheet 190 and serves as a flow path of air from the sensing cuff 24 to the pressure sensor 33. Also, second thick film sheet 140 is formed with a fourth communication flow path 144 that connects sensing cuff connection hole 122c of second metal plate 120 described below and second orifice 196 of thin film sheet 190. Also, second thick film sheet 140 is formed with a fifth communication flow path 145 that connects first orifice 195 of thin film sheet 190 and sensing cuff connection hole 122a of second metal plate 120 described below and serves as a flow path for air toward sensing cuff 24.

[0045] 8, four positioning openings (149a, 149b, 149c, and one not shown in the drawing) are provided near the four corners of the second thick film sheet 140, which function as positioning parts when joining the layers and form the screw insertion holes 109a, 109b, 109c, and 109d. The thickness of the second thick film sheet 140 is, for example, 0.15 mm.

[0046] Second metal plate 120 is made of a metal material such as stainless steel, and is provided near one end in the longitudinal direction with pressure cuff connection holes 121a and 121b that form a flow path for air flowing into pressure cuff 22, and pressure cuff connection hole 121c that forms a flow path for air exhausted from pressure cuff 22. Further, is provided near the other end in the longitudinal direction with sensing cuff connection hole 122a that forms a flow path for air flowing into sensing cuff 24, and sensing cuff connection holes 122b and 122c that form a flow path for air exhausted from sensing cuff 24. Pressure cuff connection holes 121a, 121b, and 121c form pressure cuff connection part 106, and sensing cuff connection holes 122a, 122b, and 122c form sensing cuff connection part 107.

[0047] 8, four positioning openings (129a, 129b, 129c, and one not shown in the drawing) are provided near the four corners of the second metal plate 120, which function as positioning portions when joining the layers together and form the screw insertion holes 109a, 109b, 109c, and 109d. The thickness of the second metal plate 120 is, for example, 0.35 mm.

[0048] (Effects of this embodiment) According to the above-mentioned configuration of flow path plate unit 100, the flow resistance of the flow path can be adjusted by first orifice 195 and second orifice 196 formed in thin film sheet 190, and the resistance error of the flow path can be reduced, so that a flow path with small resistance error can be realized at low cost. In addition, flow path plate unit 100 is formed by joining two metal plates and a thin film sheet with double-sided tape on which a flow path is formed, and the flow path can be appropriately sealed.

[0049] <Modification> In the above embodiment, the flow path plate unit 100 is formed from five sheet-like members, but this configuration is not necessarily required. A flow path plate unit 200 according to a modified example will be described below. In the following description, the same reference numerals are used for components common to the blood pressure measurement device 1 of the first embodiment, and detailed description thereof will be omitted.

[0050] Fig. 10 is an exploded perspective view of the flow path plate unit 200. The appearance of the flow path plate unit 200 is almost the same as that of the flow path plate unit 100, as shown in Fig. 5. The air flow between the pump 31, the pressure cuff 22, the sensing cuff 24, the valve 32, the pressure sensor 33, and the atmosphere opening port 104 via the flow path plate unit 200 is also the same as in the first embodiment. That is, the air flow inside the flow path plate unit 200 is also the same as that of the flow path plate unit 100.

[0051] 10, the flow path plate unit 200 includes as components a first metal plate 110, a first thick film sheet 130, a thin film sheet 290, a second thick film sheet 140, and a second metal plate 120, similar to the flow path plate unit 100. In addition to these sheet-like members, a buffer film 250 and a double-sided tape 270 are disposed between the first thick film sheet 130 and the thin film sheet 290, and a buffer film 260 and a double-sided tape 280 are disposed between the second thick film sheet 140 and the thin film sheet 290, respectively.

[0052] The buffer films 250 and 260 are each made of a resin (PET) film and have a thickness of, for example, 0.025 mm. The double-sided tapes 270 and 280 each have a base material such as an acrylic foam material and have a thickness of, for example, 0.03 mm.

[0053] Moreover, the buffer films 250, 260 and the double-sided tapes 270, 280 all have the same shape in a plan view and are provided with the same openings. Specifically, the openings are an opening constituting a flow path of air flowing from the pump 31 to the pressure cuff 22, an opening constituting a flow path connecting the first communication flow path 131 of the first thick film sheet 130 and the fifth communication flow path 145 of the second thick film sheet 140, an opening constituting a flow path connecting the second communication flow path 142 of the second thick film sheet 140 and the valve 32, an opening constituting a flow path connecting the third communication flow path 143 of the second thick film sheet 140 and the pressure sensor 33, and an opening constituting a flow path connecting the fourth communication flow path 144 of the second thick film sheet 140 and the atmosphere opening port 104.

[0054] In addition, the buffer films 250, 260 and the double-sided tapes 270, 280 are also provided with openings that form the screw insertion holes 109a, 109b, 109c, and 109d, as well as an opening that forms the opening 108 for preventing interference with components housed inside the main body housing 11.

[0055] The thin film sheet 290 of this modified example is composed of orifice forming portions 291 and 292 made of metal (for example, nickel). In addition, a film portion 293 made of resin (for example, PET) formed so as to have approximately the same thickness as the orifice forming portions 291 and 292 is arranged in the same layer as the thin film sheet 290. Specifically, the film portion 293 is provided with an opening having a shape slightly larger than the area of ​​the orifice forming portions 291 and 292, and the orifice forming portions 291 and 292 and the film portion 293 are arranged so that the orifice forming portions 291 and 292 fit into the opening in a plan view.

[0056] A first orifice 295 is formed in the orifice forming portion 291, and a second orifice 296 is formed in the orifice forming portion 292. The orifice forming portions 291, 292 may be formed by, for example, electroforming. By forming the orifice forming portions 291, 292 (thin film sheet 290) by electroforming, the orifice diameter can be formed with high precision, and the manufacturing cost can be reduced by reducing the overall area of ​​the thin film sheet 290. .

[0057] Since the orifice forming parts 291, 292 and the film part 293 are separate members, the bonding stability of each member and the sealing of the flow path can be strengthened by providing layers of double-sided tapes 270, 280. In addition, by providing layers of buffer films 250, 260, it is possible to prevent the flow path from being narrowed in the Z direction.

[0058] Moreover, by forming the flow path plate unit 200 in multiple layers as in this modified example, it is possible to configure a complex flow path.

[0059] <Other> The above examples are merely illustrative of the present invention, and the present invention is not limited to the above specific embodiments. Various modifications and combinations of the present invention are possible within the scope of the technical concept. For example, in each of the above examples, the thin film sheet is configured to have two orifices, but the number of orifices is not necessarily limited to two, and may be one or three or more. In other words, the flow path in the flow path plate unit can be freely designed.

[0060] 10, the film portion 293 covers the entire area other than the thin film sheet 290 when the flow path plate unit 200 is viewed in plan, and is formed in a shape having an opening in which the orifice forming portions 291 and 292 fit, and is arranged in the same layer as the thin film sheet 290 (the orifice forming portions 291 and 292), but this is not necessarily the case. For example, the film portion 293 may be arranged in such a manner that a plurality of small film portions 293 are dispersed in the same layer as the thin film sheet 290, or the film portion 293 may not be arranged.

[0061] In addition, the fluid flowing through the flow path plate unit is not limited to a gas such as air, and the flow path plate unit may be a unit that configures a flow path for a liquid. In addition, the flow path plate unit may be used in blood pressure measurement devices other than wristwatch type devices. [Explanation of symbols]

[0062] 1. Blood pressure measuring device 10 Main body 11 Main body 12. Display 13a, 13b... Operation buttons 14. Rug 16···Cuff cover 17 Control board 20 Belt section 21. Belt 22 Pressure cuff 24 Sensing cuff 25... Hook and loop fastener 31. Piezoelectric pump 32 Valve 33 Pressure sensor 91 Rechargeable battery 100, 200... Flow path plate unit 101 Pump connection 102 Valve connection part 103 Sensor connection part 104 Atmospheric release port 106...Pressure cuff connection part 107 Sensing cuff connection part 108...Opening 109a, 109b, 109c, 109d...screw insertion holes 110...1st metal plate 111 Pump connection hole 112, 132, 192... Valve connection hole 113, 133, 193...Sensor connection hole 114, 134: Atmospheric connection hole 119a, 119b, 119c, 119d, 129a, 129b, 129c, 139a, 139b, 139c, 149a, 149b, 149c, 199a, 199b, 199c... Positioning opening 120...Second metal plate 121a, 121b, 121c, 141a, 141b, 191a, 191b... Pressure cuff connection hole 122a, 122b, 122c: Sensing cuff connection holes 130...First thick film sheet 131...First connecting passage 140...Second thick film sheet 142...Second connecting passage 143... 3rd connecting channel 144...4th connecting channel 145···5th connecting channel 190, 290...Thin film sheet 195, 295...First orifice 196, 296...Second orifice 250, 260... Buffer film 270, 280... Double-sided tape 291, 292...Orifice forming portion 293 Film Section T···Wrist

Claims

1. A fluid channel plate unit having a fluid channel formed therein and a connection part to a pump and a cuff, A first plate member on which at least the connection portion to the pump is formed, A second plate member having at least a connection portion with the cuff, A thin film sheet is disposed between the first plate member and the second plate member and is provided with one or more orifices, A first thick film sheet is disposed between the first plate member and the thin film sheet, and has a flow path that connects the connection portion of the first plate member to the pump and the orifice of the thin film sheet, and is formed to be thicker than the thin film sheet, A second thick film sheet is disposed between the second plate member and the thin film sheet, and has a flow channel that connects the connection portion of the second plate member with the cuff and the orifice of the thin film sheet, and is formed to be thicker than the thin film sheet, The device comprises a film member disposed between the first plate member and the second plate member, having a thickness approximately the same as the thin film sheet and having an opening in a plan view that accommodates the thin film sheet, The thin film sheet is a metal sheet on which the orifice is provided, and is formed in a shape with a smaller area than each of the first plate member, the second plate member, the first thick film sheet, and the second thick film sheet, and is placed in the opening of the film member. Flow channel plate unit.

2. The first plate member, the first thick film sheet, the thin film sheet, the second thick film sheet, and the second plate member are joined together by an adhesive member. The flow channel plate unit according to claim 1, characterized in that

3. The first thick film sheet and the second thick film sheet are double-sided tapes. The first thick film sheet is bonded to the first plate member on one side and to the thin film sheet on the other side. The second thick film sheet is bonded to the second plate member on one side and to the thin film sheet on the other side. The flow channel plate unit according to claim 2, characterized in that

4. The thin film sheet is formed by electroforming. The flow channel plate unit according to claim 1, characterized in that

5. The first thick film sheet and the second thick film sheet are double-sided tapes. A first film sheet is disposed between the first thick film sheet and the thin film sheet, A first adhesive sheet is disposed between the first film sheet and the thin film sheet, A second film sheet is disposed between the second thick film sheet and the thin film sheet, A second adhesive sheet is disposed between the second film sheet and the thin film sheet, Furthermore, it has The flow channel plate unit according to claim 1, characterized in that

6. The orifice is formed to have a tapered shape that opens to the side into which the fluid flows. The flow channel plate unit according to claim 1, characterized in that

7. Each of the first plate member, the first thick film sheet, the thin film sheet, the second thick film sheet, and the second plate member has a notch or hole formed in it for positioning during joining. The flow channel plate unit according to claim 1, characterized in that

8. A blood pressure measuring device comprising the flow channel plate unit according to any one of claims 1 to 7.

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