JP2599899Y2 - Sheet for mounting probe for pulse oximeter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting sheet interposed between a probe and a living body in a pulse oximeter for measuring oxygen saturation in blood.

[0002]

2. Description of the Related Art An irradiation light source for irradiating light to the skin of a living body in order to measure the oxygen saturation in the blood of the living body,
There is known a pulse oximeter including a light detection unit that receives reflected light from the inside of the skin and detects the reflected light, and includes a probe attached to the surface of the living body. Since this pulse oximeter can monitor the oxygen intake without giving any pain to the living body at the medical site, it is effectively used when there is a disorder in the respiratory or circulatory system or during surgery.

[0003]

Generally, in the probe for a pulse oximeter, the signal intensity of the reflected light changes due to the pressing force of the living body against the skin, and the probe is applied to the skin with a constant pressing force so that the change hardly occurs. Be attached. However, it is important to monitor blood oxygen saturation with a pulse oximeter, if there is a problem with the respiratory or circulatory system as described above, if physical strength decreases and breathing becomes unstable,
Alternatively, the operation is performed for a long period of time. In any of these cases, it is necessary to mount the probe continuously for a long period of time. However, the irradiation light source is usually LED
There is a problem that a low-temperature burn may occur when the device is worn for a long time as described above.

The present invention has been made in view of the above circumstances, and its purpose is to reduce the occurrence of low-temperature burns caused by long-time wearing as described above without impairing the measurement accuracy of oxygen saturation. An object of the present invention is to provide a mounting sheet that is suitably relaxed.

[Means for Solving the Problems]

In order to achieve the above object, the gist of the present invention is to provide a pulse oximeter for measuring oxygen saturation in blood, which irradiates a skin of a living body with light of a predetermined wavelength. A probe provided with light detection means for receiving and detecting the reflected light from the inside of the skin, and a mounting sheet for a pulse oximeter probe interposed between the skin of the living body, It is made of a material having transparency to light of a predetermined wavelength and low thermal conductivity.

[0006]

In this way, since the mounting sheet interposed between the probe and the skin is made of a material having a low thermal conductivity, low-temperature burns caused by long-time continuous mounting can be achieved. Generation is suitably mitigated. Further, the mounting sheet has transparency to light of a predetermined wavelength used for measurement, and the reflected light is sufficiently supplied to the light detecting means, so that the measurement accuracy is suitably maintained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing a use state of a mounting sheet 10 according to an embodiment of the present invention. The pulse oximeter probe 12 has a bottomed cylindrical housing 14.
And a light-blocking member 16 fitted into the opening of the housing 14, and has a hardness of 60 ° (JIS, for example).
Skin 6 through a disc-shaped mounting sheet 10 made of transparent silicone rubber (for example, K6301 spring-type hardness test) and having a relatively uniform thickness of, for example, about 0.5 mm and an outer diameter larger than that of the housing 14. Is pressed. The light-shielding member 16 includes a central recess 22 that accommodates the light-receiving element 20, a first light-emitting element 24, and a second light-emitting element 26.
The housing 14
The first light emitting element 24 and the second
The infrared light and the red light emitted from the light emitting element 26 are reflected on the surface of the skin 18 to block light going to the light receiving element 20 and also block light going from the outside to the light receiving element 20. . In the present embodiment, the first light emitting element 24 and the second light emitting element 26 correspond to an irradiation light source, and the light receiving element 20 corresponds to a light detecting unit.

The light receiving element 20, the first light emitting element 24, and the second light emitting element 26 are connected to a pulse oximeter main body (not shown) via a plurality of lead wires 30, and the first light emitting element 24 and the second light emitting element 24 are connected to each other. While the two light-emitting elements 26 are alternately driven in a time-division manner, the reflected light signal detected by the light-receiving element 20 is distributed in synchronization with the time-division drive in the pulse oximeter main body, so that the skin 18 The reflected light of the infrared light and the reflected light of the red light from the inside are obtained, for example, based on the amplitude value of the reflected light from a well-known algorithm as described in Japanese Patent Publication No. 53-26437. The oxygen saturation in the blood is determined.

The mounting sheet 10 is made of silicone rubber, and emits red light (for example, a wavelength of about 660 nm) emitted from the first light emitting element 24 and infrared light (for example, about 660 nm) emitted from the second light emitting element. (Wavelength about 800nm)
In this case, the reflected light from the skin 18 required for the measurement is sufficiently supplied to the light receiving element 20, and the silicone rubber has a relatively low thermal conductivity. Is unlikely to occur. Therefore, when there is a disorder in the respiratory or circulatory system, when physical strength is reduced and respiration is not stable, or when surgery is performed for a long time,
Even when the pulse oximeter probe 12 needs to be mounted continuously for a long time, it is relatively safe.

The mounting sheet 10 is provided on the housing 1.
4, and is made of relatively soft silicone rubber, so that the pressing force of the housing 14 is relieved. Is alleviated.

FIG. 2 shows an example of use of another mounting sheet 32. Since the pulse oximeter probe 12 is the same as that of the above-described embodiment, its details are omitted. is there. The mounting sheet 32 is the first
The light-emitting element 24 includes a light-transmitting portion 34 having an outer diameter substantially equal to the inner wall surface of the light-shielding member 16 on the outer peripheral side of the light-emitting element 24 and the second light-emitting element 26, and a light-shielding portion 36 formed on the outer peripheral side. The light transmitting portion 34 is made of, for example, the same silicone rubber as that of the mounting sheet 10, and the light shielding portion 36 is made of, for example, a red light and an infrared light by adding a coloring agent or the like to the same silicone rubber. Is shielded from light.
Such a mounting sheet 32 blocks disturbance light from a gap generated between the shielding member 16 and the skin 18 which is generated by interposing the mounting sheet 32 when the pulse oximeter probe 12 is mounted. More accurate oxygen saturation is measured.

Although one embodiment of the present invention has been described with reference to the drawings, the present invention can be implemented in other embodiments.

For example, the mounting sheets 10, 32 may be fixed in advance to the pulse oximeter probe 12 with an adhesive or the like, or the mounting sheets 10, 32 may be attached to the skin 18 and The probe 12 for the pulse oximeter may be attached using silicone or the like.

The mounting sheets 10 and 32 may be made of a soft vinyl resin or the like in addition to the silicone rubber of the embodiment.
In the present invention, it is necessary that the measurement accuracy of the oxygen saturation is not reduced by the mounting sheets 10 and 32, and as described in the embodiment, it transmits red light and infrared light and has a relatively uniform thickness. It is preferable that the thickness is not easily changed by the pressing of the pulse oximeter probe 12. From the viewpoint of ensuring measurement accuracy, it is preferable that the thickness be as thin as possible within a range where a sufficient heat insulating effect can be obtained.

Further, as shown in the above-mentioned Japanese Patent Publication No. 53-26437, the light used for the measurement is light having a wavelength in which the absorption coefficients of oxyhemoglobin and reduced hemoglobin are significantly different from each other, Light having a wavelength having substantially the same coefficient may be used, and the light is not limited to light having a wavelength of about 660 nm and about 800 nm described in the embodiment.
For example, two lights having wavelengths of about 400 nm and about 700 nm may be selected. Therefore, the mounting sheet 1
0 and 32 are not limited to those transmitting the red light and the infrared light, and may be any as long as the light having the wavelength to be used can be suitably transmitted.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a use state of a mounting sheet according to an embodiment of the present invention.

FIG. 2 is a view showing another embodiment of the present invention and corresponding to FIG. 1;

[Explanation of symbols]

10: mounting sheet 12: probe 18: skin 20: light receiving element (light detecting means) {24: first light emitting element, 26: second light emitting element} (irradiation light source)

Claims (1)

(57) [Scope of request for utility model registration] In a pulse oximeter for measuring oxygen saturation in blood, an irradiation light source for irradiating light of a predetermined wavelength toward the skin of a living body and reflected light from the skin are received and detected. A probe mounting sheet for a pulse oximeter probe interposed between a probe having a light detecting means and the skin of the living body, wherein the sheet has transparency to light of the predetermined wavelength, and has low heat conductivity. A sheet for mounting a probe for a pulse oximeter, characterized in that the sheet is made of a material having a ratio.