JPS60108043A - Blood vessel position indicator - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blood vessel position indicating device, and more particularly to a device for indicating the position of a blood vessel by utilizing the photoacoustic effect of blood or the like.

Conventionally, when injecting into a blood vessel, a cuff is wrapped around the arm to make the blood vessel stand out in order to facilitate the injection.

However, this method has the disadvantage that it may not be possible to distinguish blood vessels depending on the patient, and that the injection requires skill.

SUMMARY OF THE INVENTION In view of the drawbacks of the conventional art, an object of the present invention is to provide a device that can easily indicate the position of a blood vessel.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram of an embodiment of the present invention, and this device includes:
The position of the blood vessel 8 in the arm 9 is detected by the photoacoustic effect.

In Figure 1, the light source 1 is 450 m++ or 550 m
Generate rice with a wavelength of 1, and along the optical path of this light source l,
A light beam 2 rotated by a motor 3, a condenser lens 4, a light guide member 5, and a piezoelectric element 7 are arranged. Optical chi * y 7%2 has one or t ± multiple holes (
(not shown) is formed, and the rotation of the motor 3 turns the light from the light source 1 into intermittent light. Holes (8-1, 12-1, 12-2, 8-2) in FIG. 2)
is connected to the light guide member 5 and serves as a light irradiation port for irradiating the surface of the arm 9 with intermittent light. Hole (12-1, 12-
2) serves as a mark for marking the surface of the arm 9 with a pen or the like when the blood vessel position is detected, as will be described later.

Note that the piezoelectric element 7 is connected to electrical signal detection means (not shown).

Here, the photoacoustic effect of the blood vessel 8 will be explained with reference to FIG. 2. FIG. 2 is a graph showing the acoustic spectra of blood a, red blood cells b, and hemoglobin C, respectively from above. From the same figure, it can be seen that blood vessels 8 relatively absorb light with wavelengths around 450 mm or around 550+sw+. It can be seen that it provides a sound effect.

To explain the operation of the above embodiment, first the piezoelectric element 7 is connected to the third
As shown in the figure, it comes into contact with the surface of the arm 9.

The intermittent light from the light source l via the light chopper 2 is transferred to the light guide 5,
The arm 9 is irradiated through the irradiation hole 6-1, and the piezoelectric element 7 (
Or move the arm 9) in the direction 14 shown in the figure. When the intermittent light is applied to the position of the blood vessel 8 in this manner, the blood vessel 8 absorbs the light and generates an acoustic signal according to the frequency of the intermittent light. Since this acoustic signal is detected via the H8 electric element 7, a mark is attached to the surface of the arm 9 through the mark hole 12-1 of the piezoelectric element 7 by this detection. Similarly, the blood vessel position is detected by irradiating intermittent light through the irradiation hole 6-2, and a mark is placed on the surface of the arm 9 through the mark hole 12-2. It can be determined that the straight line connecting the two marked points in this manner is the position of the blood vessel 8.

In the above embodiment, two marks are attached using one piezoelectric element, but the blood vessel position may be detected using one mark as shown in FIG. Two elements may also be used. Furthermore, although an optical chopper was used to form intermittent light, the voltage of the light source, etc. may also be directly modulated.In this case, the modulation is simple and there is an advantage that mechanical vibrations are not easily photographed. Furthermore, in the above embodiment, intermittent light of one frequency was used to detect the two locations separately, but two intermittent lights of different frequencies were applied to each of the two locations,
It is also possible to simultaneously take the photoacoustic signals from the piezoelectric element and separate the obtained signals at their respective frequencies to measure them simultaneously, which makes detection easier.

In addition, the position of a blood vessel at a deeper location can be detected by using a high modulation frequency, and the depth of a blood vessel can be detected by measuring the phase delay of the photoacoustic signal from the blood vessel.

As described above, according to the present invention, the position of a blood vessel can be easily detected, and injections and blood sampling can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a graph of a photoacoustic spectrum, FIG. 3 is a plan view of the piezoelectric element of FIG. 1, and FIG. 4 is a diagram of another embodiment of the present invention. It is a top view of the piezoelectric element of an Example. l...Light source 2...Light chopper 7...Piezoelectric element 12-1.12-2...Mark hole (Figure 2, Figure 3, Figure 4)

Claims (1)

[Claims] a light source that irradiates light with a wavelength that is absorbed by blood vessels; a means for converting the light from the light source into intermittent light; a means for detecting sound waves generated when the blood vessels are irradiated with the intermittent light; A blood vessel position indicating device having means for placing a mark at the position of a blood vessel.