JPH0451936A - Blood monitoring sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a blood monitoring device for photoelectrically non-invasively monitoring components in blood, and particularly to a blood monitoring device of this type with improved wearability. Regarding monitoring sensors.

[Prior art and problems to be solved by the invention] A patient's blood components, especially oxygen concentration, are elements that can reliably detect abnormalities in breathing or circulation, and therefore can be detected without sampling blood. Devices (probes, sensors) that photoelectrically measure blood oxygen concentration (non-invasively) have been proposed (
JP-A-59-64031, JP-A-60-34432).

One such device is a clamp-type sensor, in which a light emitting diode and a light sensor are attached to opposing crimping parts of a clamp, and the finger is fixed so as to be sandwiched between the light emitting diode and the light sensor. The light emitted from the light emitting diode changes as it is optically absorbed by the blood in the tissue through which it passes, and this change is received by the optical sensor.

Changes due to this light absorption vary depending on the oxygen saturation of hemoglobin in the blood, and the blood concentration can be monitored by monitoring this variation.

However, in the case of this clamp-type sensor, there is a problem in that the pressure of the spring attached to the tissue reduces the blood flow to the tissue, making accurate measurement impossible.

On the other hand, the sensor disclosed in Japanese Patent Application Laid-Open No. 60-34432 has a light emitting element and a light receiving element on a flexible substrate with an adhesive surface, and does not have the problems of the clamp type. When attached to the fingers or feet, it is difficult to apply with appropriate pressure, which may cause discomfort to the patient, and there is a problem that the adhesive strength will be lost if reapplied many times.

In addition, the adhesive may have an adverse effect on the skin, such as a rash.

This invention solves these conventional difficulties and allows installation with uniform pressure depending on the size of the installation site.
Moreover, it is an object of the present invention to provide a blood monitoring sensor that is free from the risk of falling off during wear and has no adverse effects on the skin.

[Means for Solving the Problems] The blood monitoring sensor of the present invention that achieves the above objects has the following features:
A ring-shaped member that fits into a part of the body, an airbag that is affixed to the ring-shaped member to form an airtight chamber between the ring-shaped member, and an airbag that is fixed to the airbag and is inserted into the tissue of the body. It is equipped with a light emitting element that emits light, a light receiving element that is fixed to the air bag and receives the light that passes through the tissue, and sends out a light reception signal corresponding to blood components in the tissue, and an air inlet that introduces air into the airtight chamber. It is something that

[The working ring-like member is fitted onto a part of the body such as a finger or foot, and air is injected into the airtight chamber through the air inlet. By expanding the airtight chamber, the air/\tsuku and the light-emitting element and light-receiving element fixed thereto come into close contact with the part to which it is attached. That is, the blood monitoring sensor can be mounted without applying inappropriate pressure to the area in accordance with the size of the area.

Thereafter, light is irradiated into the tissue from the light-emitting element, and the transmitted light is measured by the light-receiving element, and fluctuations in blood components within the tissue are monitored from fluctuations in the amount of received light.

[Example] Hereinafter, the blood monitoring sensor of the present invention will be described based on an example shown in the drawings.

The blood monitoring sensor 1 shown in FIGS. 1 and 2 includes a ring-shaped member 2 made of plastic, metal, etc., an air bag 3 provided inside the ring-shaped member 2, and a blood monitoring sensor 1 fixed to the air bag 3. Consisting of a light emitting element 4 and a light receiving element 5, the ring-shaped member 2 is sized to match the part of the body to which the blood monitoring sensor 1 is attached. If it is for the foot, it may be of a fixed oval shape as shown in Fig. 4, but like the airbag 3, it may be made of a deformable material made of flexible resin. It's okay.

The airbag 3 is made of an elastomer such as silicone rubber or a flexible resin such as polyvinyl chloride, and at least its end portion is attached to the ring-shaped member 2 so as to form an airtight chamber 6 between the airbag 3 and the ring-shaped member 2. At the same time, it is partially attached as appropriate to allow movement of air within the airtight chamber 6.

The ring-shaped member 2 is provided with an air injection lower for introducing air into the airtight chamber 6 between the ring-shaped member 2 and the air bag 3. This air injection lower may be equipped with a one-way valve made of flexible resin. In that case, after injecting air with a syringe, rubber bulb, etc., the one-way valve can be deformed by hand. can be removed.

The light-emitting element 4 and the light-receiving element 5 are fixed to the airbag 3 so that their light-emitting and light-receiving surfaces face each other, and are connected to a power source and a monitoring device through lead wires 8, respectively. The light emitting element 4 is preferably a light emitting diode or the like that emits light of a certain wavelength, and is connected to a power source (not shown) via a lead wire 8, and irradiates a predetermined amount of light from the skin surface into the tissue.

The light receiving element 5 is a photoelectric sensor that receives light emitted from the light emitting element 4 and transmitted through the tissue, and generates a current signal according to the amount of light, and is connected to a monitoring device (not shown) via a lead wire 8. performs arithmetic processing on the signal from the light-receiving element 5 and displays its fluctuation as a value corresponding to a blood component in the tissue, such as oxygen concentration.

In such a configuration, for example, as shown in FIG. 3 or 4, the blood monitoring sensor 1 is attached to a finger 10 or a foot 11, and a syringe 9 or something like a rubber bulb is used to enter the airtight chamber 6 from the air injection lower. Air is introduced and the air bag 3 is inflated to bring the light emitting element 4 and the light receiving element 5 into close contact with the skin. On this occasion,
By adjusting the amount of air injected, the pressure applied to the fingers or feet can be adjusted, and pressure is evenly applied to the entire body. In this state, the power supply and the monitoring device are driven to emit a predetermined amount of light from the light emitting element 4 from the skin surface into the tissue, and the light receiving element 5 receives the light that has passed through the tissue, and the signal is sent to the monitoring device. The data is calculated and the fluctuation is displayed as a value corresponding to a blood component in the tissue, such as oxygen concentration. Here, since the blood monitoring sensor 1 is closely attached to the finger or leg body, it will not fall off even if the patient moves, allowing stable and accurate measurement.

In the present embodiment, the ring-shaped member 2 and the airbag 3 have been described as separate members, but they may constitute an airbag as a unit.

[Effects of the Invention] As is clear from the above embodiments, according to the blood monitoring sensor of the present invention, an airbag is provided with a light-emitting element and a light-receiving element, air is filled into the airbag, and the airbag is fitted into a desired area. If,
Since the sensor is placed in close contact with the sensor, it can be installed reliably with uniform pressure depending on the thickness of the part to which it is installed, and after installation, it will not loosen or fall off, allowing for stable and accurate measurements.

[Brief explanation of drawings]

FIGS. 1 and 2 are a plan view and a side view, respectively, showing an embodiment of the blood monitoring sensor of the present invention, FIG. 3 is a diagram showing the same embodiment installed, and FIG. 4 is a blood monitoring sensor of the present invention. It is a figure which shows another Example of a monitoring sensor. 1... Blood monitoring sensor 2... Ring member 3... Air bag 4... Light emitting element 5... Light receiving element 6... ... Airtight chamber 7 ... Air inlet

Claims (1)

[Claims] A ring-shaped member that fits into a part of the body, an air bag that is attached to the ring-shaped member so as to form an airtight chamber between the ring-shaped member, and a ring-shaped member that is fixed to the air bag and that is attached to the body. a light emitting element that irradiates light into the tissue; a light receiving element that is fixed to the air bag and receives the light that passes through the tissue and sends a light reception signal corresponding to a blood component in the tissue; and introduces air into the airtight chamber. A blood monitoring sensor characterized by comprising an air inlet.