JPH0529505U - Photoplethysmograph - Google Patents

Abstract

(57) [Abstract] [Purpose] By storing the infrared light sensor inside the cuff, it prevents the entry of extraneous light and obtains a good light shielding condition regardless of how the cuff is attached to the measurement site. At the same time, by fixing the infrared light sensor section in the housed state, a stable measurement state can be obtained. [Composition] An infrared-light-impermeable cuff for adjusting the blood flow state by air pressure, and a pulse wave detecting means for detecting a pulse wave by absorption or irregular reflection of infrared light by blood, and when the cuff is depressurized , Photoelectric volumetric sphygmomanometer that measures blood pressure based on pulse wave by absorption or diffuse reflection of infrared light by blood, and flexibility and flexibility to emit and receive infrared light inside the cuff. An infrared light transmissive accommodating portion is provided for accommodating the infrared light sensor, and for forming a path for emitting and receiving infrared light at least in a state where the cuff is attached to the measurement site.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a photoelectric volumetric sphygmomanometer. For example, when decompressing air pressure (hereinafter referred to as “cuff pressure”) by a cuff, blood pressure is measured based on a pulse wave detected by absorption or irregular reflection of infrared light by blood. The present invention relates to a photoelectric volumetric sphygmomanometer.

[0002]

[Prior Art]

 Various cuffs for photoplethysmographs have been developed in the past.

FIG. 5 is an external perspective view showing the configuration of a photoelectric volume pulse wave sphygmomanometer according to a conventional example, and FIG. 6 is an external perspective view showing a state in which a detachable infrared sensor is attached to the outer peripheral surface of FIG. FIG. 7 is a cross-sectional view seen from the side when the cuff of FIG. 6 is attached to the measurement site for measurement.

In FIGS. 5 and 6, assuming that the upper surface of the cuff 41 is the outer peripheral surface 43 and the lower surface is the inner peripheral surface 42, a part of the inner peripheral surface 42 of the cuff 41 is almost transparent to infrared light. A square-shaped portion 49 is provided. Further, a part of the outer peripheral surface 43 of the cuff 41 is also provided with substantially circular portions 48a and 48b that transmit infrared light. Further, a surface fastener 47 for fixing the infrared light sensor 53 is provided on the outer peripheral surface of the cuff 41.

In order to perform measurement using the cuff 41, first, the infrared light sensor section 53 is attached to the cuff outer peripheral surface 43. Specifically, the surface fastener 47 fixes the light emitting element 55 and the light receiving element 56 of the infrared light sensor unit 53 so as to be located in the infrared light transmitting portions 48a and 48b. After that, the cuff 41 is wound around the measurement site, wound with a cuff cloth 51 so that there is no gap, and fixed with the hook-and-loop fasteners 45 and 46.

[0006]

[Problems that the device is trying to solve]

 However, in the above-described conventional cuff 41, when it is wound loosely due to the winding strength at the time of measurement, extraneous light 60 enters through the gap between the cuffs 41 and the infrared light transmitting portion 48a on the outer peripheral surface 43 of the cuff 41 enters. , 48b to reach the light receiving element 56, affecting the measured value or causing a state in which measurement is impossible. In order to reduce the penetration of infrared light, it is possible to make the size of the infrared light transmitting portion 48 on the outer peripheral surface 43 smaller than the outer shape of the infrared light sensor portion 53. Since the positioning of the sensor part becomes more difficult, there is a drawback that it becomes difficult to mount.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and an object thereof is to easily position the infrared light sensor portion with respect to the cuff and to fix the infrared light sensor portion after mounting. The point is to provide a photoelectric volumetric sphygmomanometer that can be reliably performed.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems and achieve the object, a photoelectric volumetric sphygmomanometer according to the present invention uses an infrared non-transmissive cuff that adjusts the blood flow state by air pressure and an infrared blood. Pulse wave detecting means for detecting a pulse wave by absorption or diffuse reflection of light, and measuring the blood pressure based on the pulse wave by absorption or diffuse reflection of infrared light by the blood when the cuff is depressurized. In the meter, a flexible and flexible infrared light sensor that emits and receives infrared light is housed inside the cuff, and at least the infrared light of the infrared light is attached to the measurement site when the cuff is attached. It is characterized in that an infrared light transmissive storage means for forming a path for emitting and receiving light is provided.

Further, preferably, the inner peripheral surface of the cuff in a state in which the cuff is attached to the measurement site is characterized by having infrared light transmissivity at least in a path portion of infrared light.

Further, it is preferable that the storage means has a fitting means for fitting with the infrared light sensor.

[0011]

[Action]

 With this configuration, by storing the infrared light sensor in the storage means, the infrared light sensor can be easily fixed to the cuff, and the necessary infrared light path can be provided with transparency to improve the measurement environment. Can be held well.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. (Infrared Light Sensor Unit) FIG. 2 is an external perspective view showing the structure of the infrared light sensor unit according to one embodiment of the photoelectric volumetric sphygmomanometer according to the present invention. The infrared sensor unit 21 shown in the figure has a flat and substantially circular light emitting probe 25A and a light receiving probe 25B, a flat probe connecting band 26 connecting these probes, and an electric signal from each probe end. It is composed of a cable 22 that passes through. One light emitting probe 25A is provided with an LED (infrared light emitting element) 23 for irradiating the arterial bloodstream with infrared light, and the other light receiving probe 25B is provided with an infrared light emitted from the LED 23. A PT (phototransistor) 24 for detecting reflected light or transmitted light is provided.

The infrared light sensor portion 21 is made of a thermoplastic elastomer such as soft vinyl chloride, and the infrared light sensor portion 21 can have sufficient flexibility and flexibility. Since each probe protrudes from the probe connecting body 26 so as to be connected at one edge of the circular shape, recesses 26a and 26b are formed at the connecting portion between the peripheral edge of each probe and the peripheral edge of the probe connecting body 26. To be done. (Cuff) FIG. 1 is an external perspective view showing a configuration of a cuff according to an embodiment of the photoelectric volumetric sphygmomanometer according to the present invention. In the figure, the cuff 1 which is a long-shaped ischemic band has an air bag inside, and an air tube 4 forming an air flow path to the bag is attached to an edge portion. The cuff 1 has a structure in which an inner peripheral surface 2 is formed of a soft vinyl chloride sheet that transmits infrared light, and an outer peripheral surface 3 is formed of a soft vinyl chloride sheet on which a pigment is arranged so as to have a light shielding property. The inner peripheral surface 2 does not need to be transparent to infrared light on the entire surface, and a shielding portion may be provided near the edge portion so long as light can be received well. The cuff 1 has an air bag portion 9A on the right side of the substantially central portion 8 in the longitudinal direction, and an attachment band 9B on the left side of the approximately central portion 8 for holding the wound state when attached to the measurement site, The surface fastener 5 is provided on the inner peripheral surface 2 side of the mounting band 9B. Further, a surface fastener 6 that engages with the surface fastener 5 is also provided on the outer peripheral surface 3 of the air bag portion 9.

On the back surface of the outer peripheral surface 3 of the air bag portion 9A, a bag portion 7 for housing the infrared light sensor portion 21 is provided. The storage bag portion 7 is made of a soft vinyl chloride sheet having a size for storing the two probes of the infrared light sensor portion 21, and the peripheral portion 14 is welded to the back surface of the outer peripheral surface 3 by high frequency welding. It is joined. The storage bag portion 7 has a linear opening 10 having a width slightly smaller than the probe width of the infrared light sensor 21 on the outer peripheral surface 3 to obtain an entrance of the infrared light sensor portion 21. This is because the infrared light sensor unit 21 having flexibility is used for storage. The method will be described later. Further, holes 12a and 12b are provided at the edge of the linear opening 10 to disperse stress.

(Measurement Method) FIG. 3 is an external perspective view showing a state where the infrared light sensor section is stored in the cuff in the present embodiment, and FIG. 4 is a side sectional view showing a measurement state in the present embodiment.

As shown in FIG. 3, each probe of the infrared light sensor section 21 is inserted into the storage bag section 7 through the gap of the linear opening 10 from the tip with each surface of the LED 23 and PT 24 facing downward. It In this insertion, as shown in FIG. 3, the holes 12a and 12b at both ends of the linear opening 10 bite so as to correspond to the recesses 26a and 26b of the infrared light sensor portion 21 to form a fitted state. .. At the same time, the tip of each probe comes into contact with the tip 13 of the storage bag portion 7, and further insertion is restricted. In addition, due to the flexibility and flexibility of the infrared light sensor section 21, an insertion method in which the intervals between the probes are slightly narrowed is used, and this makes it possible to form the above-mentioned fitted state reliably. This fitting state is in a good fixed state, and even if it is loosely attached to the measurement site, that is, even if the cuff 1 has a slack, it can be prevented from slipping and coming off inside the storage bag portion 7. it can. That is, when the infrared light sensor 21 is held in the fixed state, it cannot be easily pulled out unless the infrared light sensor 21 is pulled out from the storage bag 7, and if the infrared light sensor 21 is taken out after the measurement is completed. The infrared light sensor portion 21 can be easily detached from the cuff 1 by simply narrowing the space between the probes with a finger or the like to form a probe space narrower than the width of the linear opening 10 and pulling out in this state.

Of course, since this deviation does not occur, a sufficient light-shielding property can be maintained, and even if external light enters through the gap of the cuff 1, it does not affect the measurement.

Now, as for actual measurement, as shown in FIG. 3, when the infrared light sensor section 21 is completely attached to the cuff 1, this time, the cuff is attached to the measurement site 15. This installation creates the condition shown in Fig. 4. The left side of the figure is the cuff center side, and the right side is the cuff erasing side. The cuff 1 can maintain a good measurement state even when the air bag is pressurized while maintaining this attached state, and can cause the artery 16 to emit and receive the infrared light 18 favorably. it can.

In particular, the stability of the position of the infrared light sensor portion 21 accommodated and retained in the accommodation bag portion 7 is favorably maintained.

The positional deviation of the infrared light sensor unit 21 during measurement is also a factor that largely leads to a measurement error. In the present embodiment, good blood pressure measurement is possible without such positional deviation. ..

As described above, according to the present embodiment, the infrared light sensor section 21 is housed inside the cuff 1 to prevent the invasion of external light and to determine whether the cuff is attached to the measurement site. A stable light-shielding state can be obtained by simultaneously obtaining a good light-shielding state and fixing the infrared light sensor section 21 in the stored state at the same time. Especially, since the infrared light sensor portion 21 can be positioned by a simple operation of inserting both probes of the infrared light sensor portion 21 into the cuff, the usability can be improved.

In the above-described embodiment, the recesses 26a and 26b at the peripheral edge of the infrared light sensor portion 21 and the holes 12a and 12b provided in the linear opening 10 of the storage bag portion 7 are fitted to each other so as to be red. The external light sensor section 21 is fixed, but the present invention is not limited to this, and a convex section (or concave section) is provided inside the storage bag section and a concave section is formed on the surface of the infrared light sensor section. (Or convex portions) may be provided, and the convex portions (or concave portions) and the concave portions (or convex portions) may be fitted to each other to obtain the above fixing. Each convex portion and concave portion can be formed by high frequency welding.

[0023]

[Effect of the device]

 As described above, according to the present invention, the infrared light sensor unit 21 is housed inside the cuff 1 to prevent external light from entering and prevent the cuff from being attached to the measurement site. It is possible to obtain a stable measurement state by obtaining an excellent light shielding state and fixing the infrared light sensor section 21 in the housed state at the same time.

[Brief description of drawings]

FIG. 1 is an external perspective view showing the structure of a cuff according to an embodiment of a photoelectric volumetric sphygmomanometer according to the present invention.

FIG. 2 is an external perspective view showing a configuration of an infrared light sensor unit according to an embodiment of a photoelectric volumetric sphygmomanometer according to the present invention.

FIG. 3 is an external perspective view showing a state where the infrared light sensor unit in the cuff is stored in the present embodiment.

FIG. 4 is a side sectional view showing a measurement state according to this embodiment.

FIG. 5 is an external perspective view showing the configuration of a photoelectric cuff for a plethysmograph according to the related art.

6 is an external perspective view showing a state in which a detachable infrared sensor is attached to the outer peripheral surface of the cuff of FIG.

7 is a cross-sectional view seen from a side when the cuff of FIG. 6 is attached to a measurement site for measurement.

[Explanation of symbols] 1 cuff 2 inner peripheral surface 3 outer peripheral surface 4 air tube 5, 6 surface fastener 7 storage bag portion 8 substantially central portion 9A air bag portion 9B mounting band 10 linear opening portions 12a, 12b hole void 13 tip 14 Edge part 15 Measurement site 16 Artery 17 External light 18 Infrared light 21 Infrared light sensor part 22 Cable 23 LED 24 PT 25A Light emitting probe 25B Light receiving probe 26 Probe connecting band 26a, 26b Recess 41 Cuff 45, 46, 47 surface fastener 48a, 48b Circular part 49 Square part 51 Cuff cloth 53 Infrared light sensor part 55 Light emitting element 56 Light receiving element

Claims (3)

[Scope of utility model registration request] 1. A cuff that is impermeable to infrared light for adjusting a blood flow state by air pressure, and pulse wave detecting means for detecting a pulse wave by absorbing or diffusely reflecting infrared light by blood. At the time of decompression, a photoelectric volumetric sphygmomanometer that measures blood pressure based on pulse waves by absorption or diffuse reflection of infrared light by blood,
An infrared light sensor having flexibility and light emission and reception of infrared light is housed inside the cuff, and infrared light is emitted and received at least when the cuff is attached to the measurement site. A photoelectric volume pulse wave sphygmomanometer, which is provided with an infrared-transmissive storage means that forms a path for performing the operation. 2. The photoplethysmographic blood pressure according to claim 1, wherein an inner peripheral surface of the cuff in a state where the cuff is attached to the measurement site has infrared light transmissivity at least in a path portion of infrared light. Total. 3. The photoelectric volume pulse wave sphygmomanometer according to claim 1, wherein said housing means has fitting means for fitting with said infrared light sensor.