Other

Kowa Company Limited

Shinshu University

Kazuo Ichikawa

Chukyo Medical Co., Inc.

Ichikawa, Kazuo

Kiyoshi Tanaka

Takuya Hara

Tanaka Yoshiki

Yoshiki Tanaka

[Problem] To be able to accurately measure color vision and color-viewing field for different colors. [Solution] The color-viewing function measuring means () pertaining to the present invention displays a plurality of chromatically colored targets (A, . . . ) (for example, Landolt rings) in an achromatic background (B), the brightness of the targets (A, . . . ) being set so as to be substantially equal to the brightness of the background (B). When vision or the viewing field is measured with this color-viewing function measuring means (), vision and viewing field can be accurately measured for different colors.

Color-viewing function measuring means and color-viewing function measurement system

A color perception test has a color matching processor that executes a color matching processing on a color monitor, and an image display controller that displays two or more images for color perception test in order on the color monitor on which the color matching processing was done. When displaying each image for color perception test, a color perception test is done in a state that one of its hue, brightness, saturation and display time is changed and the other elements are fixed. Since the color perception tester has the color matching processor, colors of the image are not changed with passage of time different from color printed one, and correct test can be done thereby. If the test is periodically done on some examinee, a degree of decreasing color perception function by aging can be exactly known.

Color perception tester, control program and method of controlling color perception tester

A tube device for forming a fistula is constructed in such a way that the tube device is composed of a metallic guide wire, a small diameter tube to which the guide wire can be inserted in its center, a medium diameter tube covering the outer periphery of the small diameter tube, a medium-large diameter tube covering the outer periphery of the small diameter tube and having an outer diameter larger than the medium diameter tube, a large diameter tube covering the outer periphery of the small diameter tube and having an outer diameter larger than the medium-large diameter tube, a large diameter drainage tube covering the outer periphery of the small diameter tube and having an outer diameter equal to that of the large diameter tube, and an extra large diameter tube covering the outer periphery of the large diameter drainage tube. An outer diameter of each tip portion of the small diameter tube, medium diameter tube, medium-large diameter tube and large diameter tube is gradually reduced towards ends thereof to be taper-shaped. These tubes are exchanged and inserted in the order of their diameters, i.e. from small diameter to large diameter, by means of a guide wire. The extra large diameter tube necessary for the insertion of the endscope can be inserted in a short time with an extreme safety since the tapered surface of the tip portion of the tube applies the pressure to the liver tissue to expand it gradually.

Device for forming an inserting hole for an endoscope

A drainage device used in the body cavity comprising a flexible metallic guide wire capable of being inserted into a puncture needle, a tube-like dilator made of slightly hard synthetic resin and covering the outer periphery of the guide wire, a drainage tube made of synthetic resin in which a wire is embedded and covering the outer periphery of the guide wire, a sheath made of synthetic resin having a total length shorter than that of the dilator and having at a proximal portion of the sheath a fastening plug to be liquidtightly connected to a fastening jack of the dilator, and a universal fastening jack to be detachably attached to an end of the drainage tube and to be liquidtightly connected to the fastening plug. The draingage device can simplify the insertion of the drainage tube and shorten the time required for manual drainage operation.

Growing community of inventors

Aichi, Japan

Kazuo Ichikawa