JPS6041942B2 - blood flow measuring instrument - Google Patents

Description

[Detailed Description of the Invention] The present invention applies light emitted from a light emitting element to the arterial duct of the human body,
This relates to a blood flow measuring instrument equipped with a light-receiving element that receives changes in the amount of reflected light due to arterial pulsation, and aims to improve accuracy by increasing the S/N ratio of detection.

As shown in FIGS. 1 and 2, a conventional blood flow measuring device has light emitting elements 4 in recesses 2 and 3 formed in a base 1 made of molded resin.
and a light-receiving element 5, and a translucent resin material 6 is placed in the recesses 2 and 3.
Generally, the light emitted from the light emitting element 4 becomes diffused light when it exits from the recess 2 to the outside, and the density of the light amount irradiated to the artery is low. There was a drawback that it was not possible to clearly detect differences, that is, the detection SN ratio was poor.

The present invention has been made in view of such drawbacks, and the following is the third section.
A description will be given according to the embodiment shown in the figures and FIG.

In the figure, 1... base, 2... recess, 3... recess, 4... light emitting element, 5
. . . The light receiving element has the same elements as the conventional example.

Reference numerals 7 and 7 are embankments having edges provided around the peripheries of the recesses 2 and 3, and are integrally provided during the molding process of the base 1 made of molded resin.

8 is a translucent resin material using, for example, a vinyl acetate adhesive or an area adhesive, which is injected into the recesses 2 and 3 and filled and hardened.

At this time, the translucent resin material 8 rises due to surface tension along the tangent to the edge of the embankment 7, forms a convex lens 9, and hardens. Such a blood flow measuring instrument is used by pressing the abdomen A of the fingertip against the convex lens parts 9, 9, as shown in FIG. The light is focused by the section 9, hits the pulsating artery, is absorbed and reflected, and the reflected light passes through the convex lens section 9 and reaches the light receiving element 5, where the pulsation of the artery is detected. According to experiments, the effect of the convex lens part 9 on the side of the light emitting element 4 was large, and the effect of the convex lens part 9 on the side of the light receiving element 5 was small, and the one provided with two convex lens parts 9 had a preferable effect.

FIG. 5 shows another embodiment of the present invention, in which the embankment J7 has a groove 10 around the base of the embankment J7 instead of having an edge, and is made of a translucent resin material as in the above embodiment. It is possible to bulge due to the surface tension of 8.

As described above, the blood flow measuring device of the present invention uses a translucent resin material to fix the light emitting element, and has a convex lens portion formed with a simple structure of simply providing the bank portion 7 on the base. Therefore, it was possible to simplify the structure and improve the detection SN ratio.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional blood flow measuring device compared to the present invention, and FIG. 2 is a sectional view of the same.

Claims (1)

[Claims] 1. A light-emitting element and a light-receiving element are housed in a recess provided in a base, a bank is provided at least around the periphery of the recess where the light-emitting element is housed, and a translucent resin material is filled in the recess and hardened, and the above-mentioned bank is filled with a translucent resin material and hardened. A blood flow measuring device characterized by forming a raised convex lens portion.