JPS6397146A - Blood rate measuring probe - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blood flow Atl'llll probe that detects the contact pressure that the tip of the probe exerts on a test area. .

[Conventional technology]

BACKGROUND ART A blood flow meter is known that uses a probe to irradiate the surface layer of the skin with laser light and determines the blood flow rate from the reflected light. In this case, if the probe of the blood flow meter is simply pressed against the superficial layer, the contact pressure has the disadvantage of inhibiting blood flow, resulting in an inability to accurately measure blood flow. .

[Object of the Invention] An object of the present invention is to solve the above-mentioned drawbacks of the conventional example, to set the contact pressure of the probe at an appropriate value to prevent interference with accurate blood flow measurement, and to solve the problem of blood flow measurement. An object of the present invention is to provide a countercurrent measurement probe that reduces errors in relation to the current.

[Summary of the Invention] The gist of the present invention to achieve the above-mentioned object is to detect the contact pressure against the surface layer at the tip of a probe through which an optical fiber is inserted to contact the surface layer and measure the blood flow rate. This is a blood flow measuring probe characterized by being provided with means.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a configuration diagram of a blood flow measuring main body and a probe. The blood flow meter main body 1 is equipped with a blood flow indicator 2, a contact pressure indicator 3, and an optical fiber is connected via a connector 4. A fiber probe 5 is connected. A probe holder 6 is provided at the tip of the fiber probe 5, and a piezoelectric material 7 serving as a contact pressure sensor is attached to the probe holder 6.

As the principle of blood flow measurement, for example, a laser Doppler method is used, but there are various methods for signal processing and the configuration of the fiber probe 5.

However, in any case, it is known that the microcirculation of the subject S, that is, the microvascular flow circulation, is affected by the contact pressure of the probe holder 6 at the tip of the fiber probe 5 to the subject S. There is. Therefore, in order to maintain the contact pressure with which the fiber probe 5 is pressed against the test portion S at an appropriate value, it is necessary to detect the contact pressure.

FIG. 2 shows a configuration diagram of the contact pressure sensor. When contact pressure is applied to the piezoelectric material 7, a current is generated in response to the contact pressure, which can be detected by the current measuring type contact pressure indicator 3. Note that FIG. 3 shows a signal waveform of contact pressure fluctuation.

In the present invention, an electric wire for extracting a contact pressure detection signal is embedded together with an optical fiber in the optical fiber probe 5 shown in FIG. 3, it is possible to monitor the contact pressure.

Therefore, if the fiber probe 5 is pressed against the test part S so that this contact pressure is constant, the obtained blood flow value will be reliable.

Note that this contact pressure monitor value can also be simultaneously recorded on the recording device along with other measured quantities, such as blood flow and temperature.

[Effects of the Invention] As explained above, the blood flow measurement probe according to the present invention can detect the contact pressure of the probe applied to the test area by providing a sensor capable of detecting contact pressure at the tip of the probe. This has the advantage of reducing measurement errors.

[Brief explanation of the drawing]

The drawings show an embodiment of the blood flow measuring probe according to the present invention, and FIG. 1 is a configuration diagram thereof, FIG. 2 is a configuration diagram of a contact pressure detection section, and FIG. 3 is an output characteristic diagram. Reference numeral 1 denotes a blood flow meter body, 2 a blood flow indicator, 3 a contact pressure indicator, 4 a connector, 5 an optical fiber probe, 6 a probe holder, and 7 a piezoelectric material. Patent applicant Canon Co., Ltd. Figure 3 = 273-

Claims (1)

[Scope of Claims] 1. A blood flow characterized in that a means for detecting contact pressure against the surface layer is provided at the tip of a probe through which an optical fiber is inserted for contacting the surface layer and measuring the blood flow rate. Measurement probe. 2. The blood flow measurement probe according to claim 1, wherein means for transmitting a detection signal from the contact pressure detection means is inserted into the probe. 3. The blood flow measurement probe according to claim 1, further comprising contact pressure display means for displaying the contact pressure based on the detection signal of the contact pressure detection means on the main body side.