JPH02124138A - Measuring probe for blood current gage - Google Patents

Abstract

PURPOSE:To confirm a measuring part with the naked eye by providing an optical dividing member in the tip part of a probe and dividing the reflected light of a skin surface part to an optical fiber and an inspection hole by the optical dividing member. CONSTITUTION:A contact surface 11a of a contacting member 11 is adhered to a skin surface part S. Then, when a laser light source is operated, a laser light is outgoing from the tip of a fiber cord 15 and wholly reflected by a dichroic mirror 13 and the skin surface part S is irradiated. The laser light, which is scattered on the sin surface part S and includes blood current information, is reflected again by the dichroic mirror 13 and returned to the fiber cord 15 and blood current quantity is obtained by a measuring device. On the other hand, when the internal part of the contacting member 11 is inspected from an inspection hole 16, the light to have not less than wavelength of the laser light, which is made incident from the inspection hole 16 and affects a measuring value, is reflected by the dichroic mirror 13 and does not arrive at the skin surface part S. The light of the other wavelength band passes through the dichroic mirror 13 and arrives at the skin surface part S. Then, since the light is reflected and passes again through the dichroic mirror 13, the measuring part can be observed with the naked eye.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a measurement probe for a blood flow meter that comes into contact with the surface layer of the skin and measures blood flow.

[Prior Art] A blood flow meter that irradiates the surface layer of the skin with laser light and measures the blood flow from the reflected light has been known for a long time.For example, a measurement probe for a blood flow meter has a probe at its tip. Fiber cord 2 with a built-in optical fiber in the contact part l as shown in Figure 2
A prism 3 as shown in Figure 3 is used to change the optical path of the laser beam by 90°, and the laser beam is applied to the skin surface layer S by pressing it against the skin surface layer S. ing.

[Problems to be Solved by the Invention] However, in these conventional examples, in order to prevent the influence of external light, the contact portion 1 is made of a material that exhibits the speed of light. For this reason, the measurement site that the tip of the probe is in contact with cannot be seen with the naked eye, and there is an inconvenience that the measurement site cannot be confirmed when the tip is brought into contact with the portion to be measured or during measurement.

[Object of the Invention] In order to solve the above-mentioned problems, an object of the present invention is to provide a measurement probe for a blood flow meter, which is provided with a means for visually confirming the measurement site on the skin surface layer at the tip of the probe. It is in.

[Summary of the Invention] The gist of the present invention to achieve the above-mentioned object is to provide a blood flow meter probe for contacting the surface layer of the skin to measure the blood flow, which includes a light splitting member provided in the tip of the probe. , a measurement probe for a blood flow meter, characterized in that the light reflected from the surface layer of the skin is split into an optical fiber and a viewing window by the light splitting member.

[Embodiments of the Invention] The present invention will be explained in detail based on the embodiment shown in FIG.

FIG. 1 shows a cross-sectional view, and 11 is a contact member, in which a through hole 12 is provided in the center facing the contact surface 11a. A dichroic mirror 13 is disposed within the through hole 12 at an angle of 45 degrees with respect to the axis of the through hole 12, and this dichroic mirror 13 selectively reflects light having a wavelength equal to or longer than the wavelength of the laser beam used for blood flow measurement. It has characteristics. A side hole 14 is provided from the side surface of the contact member 11 toward the reflective surface of the dichroic mirror 13 in the transparent hole 12, and a fiber cord 15 containing an optical fiber is inserted into this side hole 14. A viewing window 16 and a protective cover 17 made of a transparent plate are attached to both upper and lower ends of the hole 12.

For measurement, the contact surface 11a of the contact member work 1 is brought into close contact with the skin surface layer S, and when a laser light source (not shown) is activated, the laser light is emitted from the tip of the fiber cord 15, is totally reflected by the dichroic mirror 13, and is applied to the skin. The surface layer S is irradiated. Then, the laser beam scattered by the skin surface layer S and containing blood flow information is reflected again by the dichroic mirror 13 and returns to the fiber cord 15, and the blood flow rate is determined by a measuring device (not shown). On the other hand, when looking into the inside of the contact member 11 through the viewing window 16, light having a wavelength longer than the laser beam that enters through the viewing window 16 and may affect the measured value is reflected by the dichroic mirror 13 and reaches the skin surface layer S. Light in other wavelength bands passes through the dichroic mirror 13, reaches the skin surface layer S, is reflected, and passes through the dichroic mirror 13 again, allowing the measurement site to be observed with the naked eye.

[Effects of the Invention] As explained above, the measurement probe for blood flow meter according to the present invention has a light splitting member that separates light reflected from the skin surface layer at the tip of the probe, so that the measurement site can be confirmed with the naked eye. This improves the operability of the probe.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a measurement probe for a current company according to the present invention, and FIGS. 2 and 3 are cross-sectional views of a conventional measurement probe for a blood flow meter. 11 is a contact member, 12 is a through hole, 13 is a dichroic mirror, 14 is a side hole, 15 is a fiber cord, 16 is a viewing window, and 17 is a protective cover. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] 1. In a blood flow meter probe that is brought into contact with the skin surface layer to measure blood flow, a light splitting member is provided within the tip of the probe, and the light reflected from the skin surface layer is connected to an optical fiber by the light splitting member. A measurement probe for a blood flow meter characterized by a window that emits spectroscopy.