JPH02174853A - Vein searching apparatus - Google Patents

Abstract

PURPOSE:To confirm the position of a vein accurately and rapidly by mounting a comparing means comparing the outputs corresponding to the quantities of lights detected by two light detection means and a position display means for displaying whether the quantities of detected lights are different or equal. CONSTITUTION:When a power supply operation switch 5 is closed, the skin is irradiated with light having a wavelength within a red or infrared region in a spot like state from the LED 10 of a light emitting element 2 and said light transmits through the skin to irradiate a vein 38 or other tissue but, since the blood in the vein 38 has specific light absorbing characteristics, the difference between the quantities of reflected lights from the vein 38 and other tissue becomes max. Therefore, when this apparatus is moved to be allowed to coincide with the vein 38 in its position, the quantities of detected lights of phototransistors 11, 12 are equal and weak, and zero or extremely low output voltage is outputted from a differential amplifier 15. Therefore, the voltage applied to LEDs 21, 22 is zero or too low and LEDs 21, 22 do not light. The collector of the transistor 27 of a window comparator 29 becomes an 'H'-level and voltage is applied to the LED 28 arranged at the center as a display means 6 in a forward direction to allow the LED 28 to light. By this method, it can be confirmed that the apparatus is positioned above the vein 38.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention enables accurate and quick confirmation of the location of a vein with a simple operation, and also enables confirmation of whether blood is sufficiently flowing through the vein. The present invention relates to a vein exploration device.

(Prior Art) In order for a doctor or nurse to administer an intravenous injection or drip to a patient, they must first be able to confirm the exact position of the patient's vein where they will puncture the injection needle or catheter. The fat layer near the inner arm joint is relatively thin, making it relatively easy to identify veins.

Therefore, the upper arm is usually strangled with a rubber band or the like to stop the blood circulation in the veins, and the veins are made to stand out due to the blood pressure to confirm the position more accurately.

(Three Problems to be Solved by the Invention) Incidentally, the thicker the fat layer, the more difficult it is to confirm the position of the vein, and it may not be possible to confirm the position even if the above-mentioned rubber band or the like is used. When the location of the vein cannot be confirmed by simply squeezing the upper arm with a rubber band, the conventional method is to warm the arm or probe the vein with the tip of a needle, but this requires skill and is difficult for the patient. There was a problem that caused severe pain. Furthermore, routine procedures performed on hospitalized patients at night are made more difficult by performing them in the dim light.

Furthermore, it is difficult to perform emergency treatment. Furthermore, sometimes the intoxicant may not be sufficiently flowing into the identified vein due to a direct plug or other cause. Therefore, it is desirable to be able to confirm that blood is flowing through the vein where intravenous injection or drip is performed.

The present invention has been made in view of the above-mentioned conventional circumstances regarding the confirmation of the position of a vein, and it is possible to accurately and quickly confirm the position of a vein with a simple operation, and to check whether blood is flowing through the vein. The purpose of the present invention is to provide a vein exploration device that can confirm the following.

(Means for Solving the Problems) In order to achieve the above object, the vein exploration device of the present invention is configured as follows.

First, the vein exploration device of the present invention includes a light emitting means that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by the blood in the veins, and a light emitting means that is arranged on both sides of the light emitting means to emit reflected light. two light receiving means for receiving light, a comparing means for comparing outputs according to the amount of light received by these two light receiving means, and a method for determining which of the two light receiving means has the stronger amount of light received according to the output of the comparing means. a position display means for displaying whether the light receiving means is the same; a pulsation detection means for detecting a pulsation component from an output according to the amount of light received by at least one of the light receiving means;
The pulsation display means displays the presence or absence of the pulsation component according to the output of the pulsation detection means. The pulsation detecting means may be configured to operate when the amounts of light received by the two light receiving means are the same.

The vein exploration device of the present invention also includes a light emitting means that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by blood in the veins, and a light emitting means that is arranged on both sides of the light emitting means to emit reflected light. A plurality of sets of optical detection means each consisting of two light receiving means for receiving light are arranged at the tip of the housing so that the light emitting means are lined up in a straight line in the rearward direction, and A comparison f stage is provided for comparing the outputs according to the amounts of light received by the light receiving means, respectively, and a position display for indicating which of the two light receiving means has the weaker or the same amount of light received according to the outputs of these comparison means. a pulsation detection means for detecting a pulsation component from an output corresponding to the amount of light received by at least one of the light receiving means, and a pulsation display for displaying the presence or absence of the pulsation according to the output of the pulsation detection means. It may be configured by providing means.

It is also possible to configure the pulsation detection means to operate when the amounts of light received by a plurality of sets of the two light receiving means are all the same.

Further, the vein exploration device of the present invention includes one light emitting means that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by the blood in the veins, and a light emitting means that radially opposes the light emitting means with the light emitting means in the center. An optical detection means is provided which includes a plurality of pairs of light receiving means arranged to receive reflected light, and a comparison means is provided for each of the opposing pairs of light receiving means to compare the output according to the amount of light received, and these comparison means are provided. According to the output of the means, when the amount of light received by the pair of light receiving means is different, one of the two display elements is turned on and the other is turned off to display which one has the weaker amount of light received, and when the amount of light received is the same, both display elements are displayed. The number of detection display means for lighting up the display elements of the light receiving means is equal to the number of the pairs of light receiving means, and the pulsation detection means for detecting a pulsation component from the output corresponding to the amount of light received by at least one of the light receiving f stages is provided. A pulsation display means for displaying the presence or absence of the pulsation component according to the output of the means may be provided. It is also possible to configure the pulsation detecting means to operate when the amount of light received by a predetermined pair of light receiving means is the same.

(Function) First, the light emitted from the light emitting means passes through the skin and is absorbed by the blood in the veins. Further, the light that is not irradiated to the veins is reflected by human body tissues such as fat layers, and this reflected light passes through the skin again and is received by the light receiving means. The amount of reflected light changes depending on the position of the two light receiving means with respect to the vein, and the amount of light received by the two light receiving means differs. That is, the position of the vein can be confirmed by the difference in the amount of reflected light due to the difference in light absorption characteristics between the vein and other tissues. Therefore, if the amounts of light received by the two light receiving means are different, the position display means corresponding to the light receiving means receiving the weaker amount of light is displayed to indicate that the position of the vein has shifted. Further, if the amounts of light received by the two light receiving means are the same, this is displayed on the position display means to indicate that the position of the vein is at the center of the device. Furthermore, if blood is flowing in the veins, the amount of light received by the light receiving means will include a pulsation component corresponding to the pulsation due to changes in blood flow velocity due to the pulsation. Therefore, the pulsation component is detected by the pulsation detection means from the output corresponding to the amount of light received by the light reception means.

Then, if sufficient blood is flowing in the vein and a pulsation component can be detected at a predetermined level or higher, the pulsation display means is lit to indicate that blood is flowing in the found vein. If the pulsation detecting means is operated when the amounts of light received by the two light receiving means are the same, then when the position of the device matches a vein, it is determined and displayed whether or not blood is flowing in that vein.

Furthermore, if a plurality of sets of optical detection means are arranged at the tip of the housing so that the light emitting means are lined up in a row in the rearward direction, and a position display means is provided for each set, all the position display means can be used for two light receiving means. When it is displayed that the amount of received light is the same, the position and direction of the device match the position and direction of the vein. Further, whether or not blood is flowing through the found vein is indicated by whether or not the pulsation display means is lit.

If the pulsation detection means is operated when the amount of light received by the two light receiving means in multiple sets is the same, then when the position and direction of this device match the vein, it is possible to determine whether blood is flowing through the vein. Distinguish and display whether or not.

Furthermore, a plurality of pairs of light receiving means are arranged radially to face each other with one light emitting means in the center, and when the amount of light received by the paired light receiving means is different, one of the two display elements is turned on and the other is turned on. If a detection display means is provided for each of the detection and display means that turns off the light and turns on both display elements when the amount of received light is the same, both display elements of the detection and display means corresponding to the pair of light reception means that correspond to the position and direction of the vein It will be lit.

Further, the pulsation display means indicates whether or not blood is flowing through the found vein. If the pulsation detecting means is operated when the amount of light received by the predetermined pair of light receiving means is the same, then when the position and direction of the vein match the line connecting the predetermined pair of light receiving means, blood flows into the vein. Distinguish and display whether or not it is flowing.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a circuit diagram of an embodiment of the vein exploration device of the present invention, FIG. 2 is an external perspective view of the vein exploration device of the present invention, and FIG. Part A
4 is a sectional view taken along line B-B of the front end of the housing in FIG. 2, and FIGS. 5 to 7 are
FIG. 2 is a diagram showing that the display differs depending on the position of the single device shown in FIG. 1 with respect to a vein.

First, in FIGS. 2 to 4, the vein exploration device of the present invention has a small and portable elongated casing 1 with a wavelength light in the red to infrared region (700 nm to 2000 nm) attached to the tip of a small and portable elongated housing 1.
Light emitting elements 2 such as LEDs or lamps as light emitting means for emitting light (m) are arranged in the center so as to illuminate the front of the tip. Furthermore, at the tip of the housing 1, on both sides of the light emitting element 2, light receiving elements 3.3 such as phototransistors or photodiodes are arranged as light receiving means for receiving wavelength light in the red to infrared region. The light emitting element 2 and the light receiving element 3.3 are equipped with an optical lens (not shown), and the light emitting element 2 illuminates a narrow area in a spot manner, and the light receiving element 3.3 receives only reflected light from a predetermined direction. It will be planned. These light-receiving elements 3, 3 have their optical axes at a slight angle so as to intersect with the irradiation direction of the light-emitting element 2, so that they can efficiently receive only the light reflected by tissues other than veins. Placed.

A battery 4 for driving power is housed in the housing 1 so that it can be easily replaced. In addition, on the outer peripheral wall of the housing 1,
A power operation switch 5 for supplying and controlling the drive power of the battery 4, and display elements 6, 6 such as LEDs or lamps as position display means for displaying the positional relationship between the device and the vein.
．． 6 is placed. Furthermore, an arrow 7 indicating the center of the device is engraved in the center of the outer peripheral wall at the tip of the housing 1, and
A display element 8 is provided as a pulsation display means for indicating whether or not blood is sufficiently flowing through the veins, and a clip 9 is provided for clipping the device to a pocket, a medical record, or the like. Furthermore, the housing 1 is molded of resin or the like, has a waterproof structure, and is configured to be easily cleaned and disinfected.

Next, the circuit of this device will be explained with reference to FIG.

In the if diagram, L E D 10 as light emitting element 2
The anode of the phototransistor 11.12 and the collector of the phototransistor 11.12 as the light receiving element 3.3 are connected to a voltage of 10V. The cathode of LED 10 is grounded via a resistor. The emitters of phototransistors 11 and 12 are also connected to the bases of transistors 13 and 14, respectively. The collectors of these transistors 13, 14 are connected to the voltage +V. The emitter of one transistor 13 is grounded via a resistor and connected to one input terminal of a differential amplifier 15 via another resistor. Also,
The emitter of the other transistor 14 is grounded through a resistor and connected to the input terminal of the differential amplifier 15 through another resistor. The input terminal of the differential amplifier 15 is connected to the resistor of a variable resistor for offset adjustment to which voltages +V and 1 are connected at both ends. Furthermore, one input terminal and output terminal of the differential amplifier 15 are connected via a feedback resistor. Note that the L E D 10 constitutes a light emitting means 16, and the phototransistor 11.12 and the transistors I:1 and 14 constitute two light receiving means 17.18.
A comparison means 19 including a differential amplifier 15 is constructed.

Further, the output terminal of the differential amplifier 15 is connected to a low-pass filter 20 having a cutoff frequency of 5H. The output terminal of this low-pass filter 20 is connected to an L E D connected in antiparallel as a display element 6.6 via a resistor.
21 and 22, and these L E D
The other ends of 21 and 22 are grounded.

Furthermore, the output terminal of the low-pass filter 20 is connected to one input terminal and a manual input terminal of two differential amplifiers 23 and 24, respectively. The other manual input terminal and one input terminal of these differential amplifiers 23 and 24 are respectively connected to sliders of a variable resistor for detecting width adjustment to which voltages +V and -V are connected at both ends. The output terminals of the two differential amplifiers 23 and 24 are connected through diodes 25 and 26 in the forward direction, respectively, and the connection point thereof is further connected to the base of a transistor 27 through a resistor. This transistor 27
The base of is grounded through a resistor, the emitter is also grounded, the collector is connected to voltage +V through a resistor, and the L E D as display element 6 is connected through another resistor.
Connected to the anode of Z8. The cathode of this LED 28 is grounded. Note that a window converter and a parator 29 are configured by including the differential amplifiers 23 and 24, diodes 25 and 26, and the transistor 27.

In addition, there are L E D on the left and right with L E D 28 in the center.
21 and 22 are arranged to constitute a position display means 30.

Further, the emitter of the transistor 14 of one of the light receiving means 18 is connected to the band pass filter 32 through the opening/closing means 31.
connected to. This opening/closing means 31 is a normally open contact, which is supplied with the voltage of the collector of the transistor 27 of the window comparator 29 as a control voltage, and is closed when an "H" level is supplied. And the band pass filter 32
extracts a pulsating component (for example, 1 to 3H2) included in the output according to the amount of light received by the light receiving means 18. The output end of this bandpass filter 32 is connected to a manual input terminal of a comparator 34 via a rectifier 33. One input terminal of the comparator 34 is connected to a slider of a variable resistor for setting a reference voltage, which has one end grounded and the other end connected to a voltage +V. Further, the output terminal of the comparator 34 is connected to the pulsation display means 3
It is connected to the anode of LED 36 as display element 8 of No. 5. The cathode of this LED 36 is grounded. The pulsation detection means 37 includes the opening/closing means 31, the bandpass filter 32, the rectifier 33, and the comparator 34.
is configured.

The operation of the vein exploration device of the present invention having such a configuration will be explained below with reference to FIGS. 5 to 7.

First, attach the tip of the housing l to the vein 38 near the internal arm joint, for example.
Touch the upper skin and turn on the power operation switch 5. Then, L E D 10 as the light emitting element 2
A wavelength of light in the red to infrared range is applied to the skin in spots and passes through the skin to illuminate veins 38 or other tissue. Here, the irradiated light is absorbed by reduced hemoglobin contained in the blood flowing in the vein 38. In addition, the irradiated light irradiated to other tissues is reflected,
The light passes through the skin again and is received by a phototransistor 11.12 serving as a light receiving element 3.3.

By the way, the properties of light irradiated to the skin, which are transmitted through the skin or absorbed by the skin, and further reflected by the surface, are significantly different depending on the wavelength. Near-ultraviolet light is largely absorbed by the stratum corneum, and visible light is highly reflected on the skin surface. Furthermore, wavelength light in the red or infrared region ()00n
m~2000nm)- is relatively less absorbed and reflected by the skin and easily passes through the dermis. Then, when the wavelength reaches a relatively large infrared ray (3000 nm), the absorption in the stratum corneum increases again. By the way, other human tissues such as fat layers have reflective properties for light having wavelengths in the red to infrared range, but blood within the veins 38 has unique light absorption properties. For this reason, by irradiating light with a wavelength in the red or infrared region, the difference in the amount of light reflected from the vein 31 and the other 1IIi cords becomes the largest.

Further, the flow velocity of blood flowing within the vein 38 changes depending on the pulse rate. For this reason, the amount of reflected light pulsates, and the output corresponding to the amount of received light also includes this pulsating component. The heart rate is usually about 70 beats per minute, and even when the patient is out of breath, the pulse rate is less than 200 beats per minute. That is, the pulsating component is 1 to 3H25 degrees, and the pulsating component can be extracted by the bandpass filter 32.
It can be determined whether or not blood is flowing sufficiently into the vein 38 based on the presence or absence of a pulsating component of F below a predetermined level.

Therefore, if this device were to be used as shown in Fig. 5(a), the vein 3
8, and the amount of light received by the right phototransistor 11 is significantly smaller than the amount of light received by the left phototransistor 12, a large positive voltage is output from the differential amplifier 15, and the voltage is passed through the low-pass filter 20. L E as a window comparator 29 and display element 6.6
D 2], 22. Here, since the absolute value of the output voltage is large, the collector of the transistor 27 of the window comparator 29 is at "L" level, and L E D
28 does not light up.

Furthermore, since the output of the low-pass filter 20 is a positive voltage, only one LED 21 disposed on the U side to which the forward voltage is applied is lit, as shown in FIG. 5(b). By lighting up the LED 21 located on the right side, it can be confirmed that the device is slightly shifted to the left from the vein 38. Here, since the output of the window comparator 29 is at the "off" level and the opening/closing means 31 is not opened, the pulsation detecting means 37 does not operate and the LED 36 does not light up.

Therefore, as shown in FIG. 6(a), when this device is moved slightly to the right and reaches the position of the vein 38, the amount of light received by the two phototransistors II and +2 is equal, and the differential amplifier 15 is removed. The output voltage is zero or extremely small. For this reason, the low-pass filter 20 also outputs zero or extremely small output voltage. The LEDs 21 and 22 do not light up because the applied voltage is zero or too low.

In addition, the collector of the transistor 27 of the window comparator 29 becomes "H" level, and a forward voltage is applied to the L E D 2B arranged in the center as the display element 6, so that it lights up as shown in FIG. 6(b). do.

By lighting up L E D 28 placed in the center,
It is easy to confirm that the device is positioned above the vein 38.

Then, the opening/closing means 31 is closed by the "H" level output of the window comparator 29. Here, if blood is sufficiently flowing in the vein 38, the phototransistor 1
The amount of received light of No. 2 includes a pulsating component, and this pulsating component is extracted by the bandpass filter 32. This extracted pulsating component is rectified by a rectifier 33 and further compared with a reference voltage by a comparator 34. Therefore, if a pulsation component of a predetermined level or higher is included, a positive voltage is output from the comparator 34, and the L E D as the pulsation display-L stage 35 is output.
3B is lit. Therefore, L of the position display means 30
If the LED 36 of the pulsation display means 35 lights up in a state where the LED 28 is lit and the device is positioned over the vein 38, it means that blood is flowing smoothly into the found vein 38, and the LED 28 is lit and the device is positioned above the vein 38. If 36 does not light up, it can be determined that blood is not sufficiently flowing into that vein 38.

Furthermore, as shown in FIG. 7(a), if this device is roughly moved slightly to the right from the vein 38, the amount of light received by the phototransistor 12 on the left side will be significantly smaller than the amount of light received by the phototransistor 11 on the right side. .

For this reason, a large negative voltage is output from the differential amplifier 15 and is applied to the window comparator 29 and L E D 21, 22 via the low pass filter 20.

Here, since the absolute value of the output voltage is large, the collector of the transistor 27 of the window comparator 29 is "L".
Level and LED 2B do not light up.

Further, since the output of the low-pass filter 20 is a negative voltage, only the other LED 22 placed on the left side to which the forward voltage is applied is lit, as shown in FIG. 7(b). And L E D placed on the left side of this
22 lights up, it can be confirmed that the device is slightly offset from the vein 38. Here, the opening/closing means 31 remains in the open state, and the LED 36 does not light up.

In this way, by moving the device across the vein 38 and stopping it at the position where the LED 28 of the position display means 30 lights up, it is easy to see that the vein 38 exists under the arrow 7 of the device. Easy operation allows for accurate and quick confirmation. Moreover, if the LED 36 of the pulsation display means 35 is lit while the LED 28 of the position display means 30 is lit, it can be confirmed that blood is flowing sufficiently into the vein 38. Furthermore, if the LED:) 6 does not light up, it can be confirmed that blood is not sufficiently flowing into the found vein 38.

Note that the low-pass filter 20 acts to prevent external light such as an indoor lighting lamp that is turned on using a commercial frequency voltage from being output as noise.

FIGS. 8 to 15 are diagrams showing other embodiments of the vein exploration device of the present invention. FIG. 8 is a block circuit diagram of another embodiment of the vein exploration device of the present invention, and FIG. 9 is an external perspective view of the vein exploration device of another embodiment of FIG.
10 is a sectional view taken along line C-C of the tip of the housing in FIG. 9, FIG. 11 is a view taken along arrow D of the tip of the housing in FIG. 9, and FIGS. 8 is a diagram showing that the display differs depending on the position and direction of the present device shown in FIG. 8 with respect to the vein. In FIGS. 8 to 15, the same members and the like as in FIGS. 1 to 7 are given the same reference numerals and redundant explanations will be omitted.

First, in FIGS. 9 to 7s11, an optical detection means consisting of a light emitting element 2 and two light receiving elements 3.3 arranged on both sides of the light emitting element 2 is installed at the tip of the housing 1.
．． 2 are arranged in 3 sets in one row in the rear direction of the bait. and,
These optical detection means are connected to the partition walls 1a, 1. Separated by. Furthermore, corresponding to the three sets of optical detection means, three sets of position display means are provided on the outer peripheral wall of the housing 1: ]0. , 30h, :10c are arranged in a matrix. That is, position display means 30.corresponding to the optical detection means arranged on the front side of the housing l. is on the front end side, position display means 30c corresponding to the optical detection means arranged at the center is at the center, position display means 30c corresponding to the optical detection means arranged on the rear side is on the rear end side, and L where the two light receiving elements 3.3 of the pair light up with the same amount of light received
E D 28□ 28b, 28c are arranged in a line in the front-rear direction.

Next, the block circuit will be explained with reference to FIG.

In FIG. 8, a light emitting means 1B and two light receiving means 1 are detected by optical detection means arranged on the front side of the front end of the housing 1.
7□18a is provided, and the light receiving means 17. ．． An output of 18° is given to comparison means 19a. And comparison means 19
The output of a is passed through the low-pass filter 20. Window comparator 29a and position display means 30° LED 21□
22. given to. Furthermore, window comparator 2
The output of 91 is the position display means 3G, L E D 2B,
given to. Similarly, corresponding to the optical detection means arranged at the center of the tip of the housing 1, a light emitting means 16b, two light receiving means +7b, a tab, a comparison means 19b, a low pass filter 20b, a window comparator 29b, and a position display means. 30b is provided. Furthermore, corresponding to the optical detection means arranged on the rear side of the front end of the housing 1, a light emitting means 16c, two light receiving means 17c and 18c, and a comparison means! 9c, a low-pass filter 20c, a window comparator 29e, and a position display means 30c.

and three window comparators 29. ．． 29b.

All the outputs of 29c are given to an AND circuit 39, and the output of this AND circuit 39 is given to the opening/closing means 31 as a control signal. Further, the output of one light receiving means 17b corresponding to the central optical detection means is given to the band pass filter 32, and the extracted output is given to the opening/closing means 31 via the rectifier 33. Furthermore, the output of the opening/closing means 31 is given to a comparator 34 and compared with a reference voltage, and the comparison output is given to L E D 36 of the pulsation display means 35 .

In this configuration, the distal end of the housing 1 is brought into contact with the skin, which is believed to be the vein 38-F near the inner arm joint, for example, and the power operation switch 5 is turned on. Then, if this device is the 12th
As shown in Figure (a), if it is slightly shifted to the left from the vein 38, the light receiving means 17 arranged on the right side of the housing l. ．． 17b,
As shown in FIG. 12(b), the amount of light received at 17C is determined by the position display means: ]Qa, 30. , 30c are all lit up. Here, three window comparators 29°, 29°
b, 29e both output a "HI" level, and the AND circuit 39 outputs an "L" level. Therefore, the opening/closing means 31 remains in the open state, and the pulsation detecting means 37
does not operate, and the LED 36 of the pulsation display means 35 is not lit.

Further, as shown in FIG. 13(a), the light receiving means 17 is located slightly to the left of the vein 38 and the directions do not match, and the light receiving means 17 is located on the right side of the front end of the housing 1. If only the light receiving means +7. Only the amount of light received by l is weak, and the first
As shown in Fig. 3(b), the right side of the surface side position display means 301 -
Side L E D 21. only lights up.

Also here, the opening/closing means 3I remains in the open state, and the LED 36 of the pulsation display means 35 does not light up.

By the way, in the position of this device as shown in FIG. It receives a large amount of reflected light. A slight difference in the tissue structure of the corresponding portions causes some difference in light reception. Therefore, comparison means +9b, 19
A small voltage corresponding to the difference is output from r, but the position display means: lOb, :10C LEDs 21b, 22. , 21C, 22c, and the voltage is too low to turn on the window comparators 29b, 29c.
The LEDs 28b and 28c are not turned on at all because it is too large to be a level.

Furthermore, move the device slightly to the right and see Figure 14(a).
If the center of the tip of the housing 1 matches the vein 38F, but the directions do not match, then the light receiving means 181 on the left side of the optical detection means on the sail side and the right side of the optical detection means on the rear side. The light receiving means 17c is located on the vein 38 and receives light 111.
L E D on the left side of the weak, surface-side position display means 30
22a and the right side L E of the rear position display means 30c.
D 21c is lit. Further, the light receiving means 17b and 18b on the left and right sides of the optical detection means arranged in the center receive the same weak amount of light, and the comparing means I9b outputs a zero or very small voltage. Therefore, the window comparator 29. outputs "H" level, and the center L E D 28. of the center position display means 30b. is lit. Therefore, the lighting state is as shown in FIG. 14(b). Also in this case, the window comparators 29a and 29c output the "L" level, the opening/closing means 31 remains in the open state, and the pulsation detecting means 37 does not operate.

Furthermore, as in Section 15(a), if the direction of the device is adjusted to match both the position and direction with the vein 38,
All pairs of light receiving means 17 on the front side, center and rear side. ．． 18
．． and 171. ．． 18b, 17c, and 18c each have the same weak amount of light received, and the comparing means 19, , +
9. ．． Zero or extremely small voltage is output from 19c. Therefore, three window comparators 29a, 29
h and 29c each output “H” level,
Which position display means 30□30b, 30. Also L in the center
E D 28a, 28b, 28c are shown in FIG. 15(b)
It will be lit like this. Furthermore, “H” is output from the AND circuit 39.
"level is output, the opening/closing means 31 is closed, and the pulsation detecting means 37 becomes in operation state. Here, the light receiving means 17,
If the amount of light received includes a pulsating component of a predetermined level or higher, it is extracted by the band pass filter 32 and a positive voltage is output from the comparator 34, and the LED 36 of the pulsating display means 35
is lit as shown in FIG. 15(a).

In this way, a plurality of sets of optical detection means are arranged so that the light emitting means are in a line in the immediate direction, and position display means: loa, 3ob, :toc are provided for each set, so the position display means: lOa, 30h , 30. L E D 2 in the center of
8. ．． 28h.

By adjusting the position and direction of the device so that 28e lights up, it can be confirmed that the vein 38 runs below the arrow 7 in the direction of the arrow 7. Moreover, this device
If the pulsation detecting means 37 operates when the position and direction coincide with the position and direction of , and the LED: 16 of the pulsation display means 35 lights up, it can be confirmed that saliva is sufficiently flowing into the vein 38. And if L E D 36 does not stipple,
It can be determined that blood has stopped flowing through the vein 38 or is not flowing sufficiently.

FIGS. 16 to 22 are diagrams showing still other embodiments of the vein exploration device of the present invention. FIG. 16 is a block circuit diagram of still another embodiment of the vein exploration device of the present invention, FIG. 17 is an external perspective view of the vein exploration device of FIG. 16, and FIG. 19 to 22 are diagrams showing that the display differs depending on the position and direction of the device shown in FIG. 16 with respect to the static Jul. FIG. In FIGS. 16 to 22, the same members as those in FIGS. 1 to 15 are given the same reference numerals and redundant explanations will be omitted.

First, in FIGS. 17 and 18, a light emitting element 40 is placed in the center of the tip of the housing 1, and this light emitting element 40
Four pairs of light-receiving elements 41 to 48 are arranged radially so as to face each other with the light-receiving elements in the center. Two straw light receiving elements 41 to 48
The light emitting element 40 constitutes an optical detection means. Then, there is one L E D on the outer peripheral wall of the housing 1.
8 L radially facing each other with 49 in the center.
ED 50-57 are arranged.

Next, the block circuit of this device will be explained with reference to FIG. A light emitting means 58 including a light emitting element 40 arranged in the center, and first to eighth light receiving elements each including light receiving elements 41 to 48.
Light receiving means 59 to 66 are provided. Then, the output of the first light receiving means 59 and the fifth light receiving means 6 paired therewith are
The three outputs are compared by the first comparison means 77, and an output corresponding to the difference is given to the first low-pass filter 78.

Further, the output of the second light receiving means 60 and the sixth light receiving means paired with this
The outputs of the light receiving means 64 are compared by the second comparison means 79, and an output corresponding to the difference is given to the second low-pass filter 80. The output of the third light-receiving means 61 and the output of the seventh light-receiving means 65 paired therewith are compared by the third comparison means 81, and an output corresponding to the difference is applied to the third low-pass filter 82. It will be done. Furthermore, the output of the fourth light receiving means 62 and the output of the paired eighth light receiving means 66 are compared by the fourth comparing means 83, and the output corresponding to the difference is sent to the fourth low-pass filter 84. given to.

The output of the first low-pass filter 78 is then applied to the first window comparator 85 and the normally closed contact of the first switching means 86. This first switching means 86 is switched to a normally open contact by the "H" level output of the first window comparator 85, and the first switching means 86 includes a first LED 50 and 54 whose common contact outputs are connected in antiparallel. detection display means 8
7 is given. Further, the output of the second low-pass filter 80 is applied to a second window comparator 88 and a normally closed contact of a second switching means 89. This second switching means 89 is switched to a normally open contact by the "H" level output of the second window comparator 88, and the second switching means 89 is switched to a normally open contact by the "H" level output of the second window comparator 88, and a second switch including L E D 51.55 in which the output of the common contact is connected in antiparallel. It is applied to the detection display means 90. Then, the output of the third low-pass filter 82 is transmitted to the third window comparator 9.
1 and the third switching means 92 are normally applied to the rA contacts. This third switching means 92 is switched to a normally open contact by the 'H' level output of the third window comparator 91,
The output of the common contact is applied to third detection and display means 93 including LEDs 52 and 56 connected in antiparallel. Furthermore, the output of the fourth low-pass filter 84 is applied to a fourth window comparator 94 and a normally closed contact of a fourth switching means 95. This fourth switching means 95 is switched to a normally open contact by the "H" level output of the fourth window comparator 94, and the output of the common contact is connected in antiparallel to the L
E D 5:1.57 is applied to the fourth detection display means 96. These first to fourth switching means 86.
AC voltage is applied to the normally open contacts 89, 92, and 95, respectively. Further, the outputs of the first to fourth window comparators 85, 88, 91, and 94 are applied to an OR circuit 97, and the output thereof is applied to a central display means 98 including an LED 49 arranged at the center.

Furthermore, the output of the first light receiving means 59 is applied via the opening/closing means 31 to the bandpass filter 32 which passes 1 to 3H2. This opening/closing means 31 is closed by the "H" level output of the first window comparator 85. Then, the pulsating component extracted by the bandpass filter 32 is rectified by a rectifier 33 and compared with a reference voltage by a comparator 34. If the extracted pulsation component is equal to or higher than a predetermined level, a positive voltage is output from the comparator 34, and the LED 36 of the pulsation display means 35 lights up.

In such a configuration, as shown in FIG. 19(a), the vein 3
If this device is slightly shifted to the left with respect to 8, and the second to fourth light receiving means 60 to 62 are above the vein 38 and the amount of light received is weak, then the second to fourth comparing means 79, 81.
Positive voltages are output from 83, respectively, as shown in Fig. 19 (b
), LEDs 51, 52, and 53 are lit. And the first to fourth window comparators 8
5, 88, 91.94 output "L" level, the first to fourth switching means 86, 89, 92.95 are not switched, and the LED 49 of the central display means 98 is not lit. Then, the opening/closing means 31 remains in the open state, the pulsation detection means 37 does not operate, and the pulsation display means 35 L E
D 314 is also not lit. Further, if only the second light receiving means 60 is located in the vein 38 as shown in FIG. 20(a), only the LED 51 is lit as shown in FIG. 20(b). Here too, the LED 36 does not light up.

and,? As shown in Figure S21 (a), the position of this device matches the vein 38, but the direction is shifted, and the vein 38
If the fourth and eighth light receiving means 62,66 are located at
The amount of light received by the eighth light receiving means 62 and 66 is the same regardless of whether it is removed, and the fourth comparing means 83 outputs zero or very small voltage, which is passed through the fourth low-pass filter 84 to the fourth window comparator. 94, and an "H" level is output. For this purpose, the fourth switching means 95 is switched to a normally open contact, and an alternating current voltage is applied to the fourth detection and display means 96, so that both the LEDs 53 and 57 are turned on.

Furthermore, the "H" level output of the fourth window comparator 84 also lights up the LED 49 of the central display means 98, resulting in a lighting state as shown in FIG. 21(b). Here too, the LED 36 is not lit. Therefore, the 22nd
As shown in figure (a), adjust the direction of this device and
If the light receiving means 59 and 63 are located at the vein 38, zero or very small voltage will be output from the first comparison means 77 and the voltage will be applied to the first window comparator 8.
5 outputs an H" level. Therefore, the first switching means 86 is switched, AC voltage is applied to the first detection display means 87, and both L E D 50 and 54 are turned on. , the output of the first window comparator 85 at "H" level causes the central display means 98 to display L E D
49 is also turned on, resulting in a lighting state as shown in FIG. 22(b).

Here, since the "H" level is output from the first window comparator 85, the opening/closing means 3I is opened and the pulsation detecting means 37 is brought into operation. If the amount of light received by the first light receiving means 59 includes a pulsating component equal to or higher than a predetermined level, the LED 16 of the pulsating display means 35 changes as shown in FIG. 22(a).
It lights up like this, and it can be confirmed that blood is flowing sufficiently into the vein 38. Note that if the amount of light received by the first light receiving means 59 does not include a pulsating component of a predetermined level or higher, L
ED 36 is not illuminated, indicating that not enough blood is flowing into the vein 38.

In the state shown in FIG. 22(a), for example, the second and sixth light receiving means 60, 64 are deviated from the vein 38 by about the same amount, and the amount of light received should be strong but almost the same. However, the tissue structures on both sides of the vein 38 are slightly different, and this difference causes some difference because the amount of light received is stronger. Therefore, although a small voltage is output from the second comparison means 79, it is too small to light up the LEDs 51 and 55 of the second detection and display means 90.

Moreover, it is too large to be detected by the second window comparator 88, and the LED 49 of the central display means 98 cannot be turned on. This corresponds to the third and seventh and fourth and eighth light receiving means 61 in the state shown in FIG. 22(a).
, 62, 65.66.

In this way, the position and direction of the device with respect to the vein 38 are visually displayed depending on the lighting conditions of the LEDs 49 to 57. Moreover, by turning on or off the LED 36, it can be easily confirmed whether or not blood is flowing sufficiently into the vein 38.

In the above embodiment, the battery 4 as a driving power source is housed in the housing 1, but the present invention is not limited to this, and it goes without saying that a commercial frequency voltage may be used as the driving power source. Further, in the above embodiment, the pulsating component is extracted from the output of one light receiving means using the band pass filter 32, but the outputs of a plurality of light receiving means are added and the pulsating component is extracted from the added output. In this case, the pulsating components are superimposed and extraction can be performed at a higher level. If the device is pressed a little more strongly against the skin, the velocity of blood flowing in the veins 38 will change more greatly, and the pulsating component can be extracted at a higher level. Furthermore, the opening/closing means 31 is omitted,
The pulsation detection means may be kept in operation at all times, and the LED: 16 of the pulsation display means 35 may be turned on when a pulsation component is detected, regardless of the position or direction of the device with respect to the vein 38.

(Effects of the Invention) Since the vein exploration device of the present invention is configured as described above, it exhibits excellent effects as described below.

First, by bringing the distal end into contact with the skin and moving it across the vein, the position of the vein can be easily, accurately and quickly confirmed in the display state of the position display means. Moreover, it does not cause any pain to the patient. Moreover, it can be easily confirmed whether or not blood is sufficiently flowing into the confirmed vein, and appropriate and effective intravenous injection or drip can be performed. By activating the pulsation detection means when the position of this device matches the vein, it is possible to determine whether or not blood is flowing only to the vein that has been found, and the pulsation can be caused by unnecessary noise. The display means is not illuminated unnecessarily.

In addition, a plurality of sets of optical detection stages each consisting of a light emitting means and two light receiving means disposed on both sides of the light emitting means are arranged in front and back rows, and the outputs of these optical detection means are arranged in front and back rows. If each display means indicates whether the amount of light received is weak or the same depending on the You can confirm that they match. Moreover,
It can be easily confirmed whether blood is sufficiently flowing through the found vein. If the pulsation detecting means is activated when the device matches the position and direction of the vein, the presence or absence of blood flow will be determined and displayed only in the found vein.

A plurality of pairs of light receiving means are arranged radially around one light emitting means, and when the amount of light received by the two light receiving means is different, one display element is turned on and the other is turned off, and both are turned on at the same time. If detection and display means are provided, the position and direction of the device with respect to the vein can be confirmed by the lighting state of these detection and display means. Furthermore, it can be confirmed whether blood is flowing through the found vein. and,
If the pulsation detection means is operated when the amount of light received by a predetermined pair of light receiving means is the same, pulsation will be detected only when a vein is located on a line connecting the pair of light receiving means, and unnecessary noise etc. The pulsation display means does not light up.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the vein exploration device of the present invention, FIG. 2 is an external perspective view of the vein exploration device of the present invention, and FIG. 3 is a top end of the casing of FIG. FIG. 4 is a sectional view taken along line A-A of the portion, and FIG.
5 to 7 are diagrams showing that the display differs depending on the position of the device shown in FIG. 1 with respect to the vein, and FIG. 8 is a sectional view of the vein exploration device of the present invention. FIG. 9 is a block circuit diagram of another embodiment of
FIG. 8 is an external perspective view of the vein exploration device of another embodiment, FIG. FIGS. 12 to 15 are views of the tip of the casing of
16 is a block circuit diagram of still another embodiment of the vein exploration device of the present invention, and FIG. 17 is a diagram showing that the display differs depending on the position and direction of the device shown in the figure. 16 is an external perspective view of the vein exploration device shown in FIG. 16, FIG. 18 is a view of the distal end of the housing shown in FIG. 17 in the direction of arrow E, and FIGS.
FIG. 6 is a diagram showing that the display differs depending on the position and direction of the device shown in the diagram. 1: Housing, 16, 16. ,! 6b, 16c, 58
: Light emitting means, 17, +7. ．． 17b, 17e, 18.1
8=, 18b, 18c. 60.61,62,63,64. ti5,66, light receiving means, +9.19. ．． 19b, 19e, 77.79.8
1.8:l: comparison means, 29.29. ．． 29b, 29
c, 85, 88, 91, 94: Window comparator. :IO, 30,, 30b, 30c: position display means, 31
: Opening/closing means, 35: Pulsation display means. 37: Pulsation detection means, 87.90, 9:1, 96: Detection display means. Patent Applicant Akai Electric Co., Ltd. Agent Patent Attorney Tetsuo Moriyama Figure 10 Figure 11

Claims (6)

[Claims] (1) A light emitting device that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by intravenous blood, and two devices that are placed on both sides of the light emitting device to receive reflected light.
a comparing means for comparing outputs according to the amount of light received by these two light receiving means; and a comparing means for comparing outputs according to the amount of light received by these two light receiving means, and determining whether the amount of light received by the two light receiving means is stronger or the same according to the output of the comparing means. a position display means for displaying, and at least one
pulsation detection means for detecting a pulsation component from the output corresponding to the amount of light received by the two light receiving means; and pulsation display means for displaying the presence or absence of the pulsation component according to the output of the pulsation detection means. A vein exploration device featuring: (2) The vein exploration device according to claim 1, wherein the pulsation detection means is configured to operate when the amount of light received by the two light receiving means is the same. (3) A light-emitting means that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by blood in the veins, and two light-receiving means arranged on both sides of the light-emitting means to receive reflected light. A plurality of sets of optical detection means are arranged at the tip of the housing so that the light emitting means are lined up in a row in the front and back direction, and a plurality of sets of optical detection means are arranged in a row in the front and back direction, and the light detection means is arranged in a manner that Comparing means for comparing the outputs are provided for each, and position display means for indicating which of the two light receiving means has a weaker or the same amount of light received according to the outputs of these comparing means is provided for each, and at least one A pulsation detection means is provided for detecting a pulsation component from the output corresponding to the amount of light received by the two light receiving means, and a pulsation display means is provided for displaying the presence or absence of the pulsation according to the output of the pulsation detection means. Vein exploration device. (4) The vein exploration device according to claim 3, wherein the pulsation detection means is configured to operate when the amount of light received by the plurality of sets of the two light receiving means is the same. . (5) One light-emitting means that irradiates a narrow range with wavelength light that passes through the skin and is absorbed by intravenous blood, and the light-emitting means are arranged radially to face each other with the light-emitting means in the center and receive reflected light. an optical detecting means consisting of a plurality of pairs of light receiving means, each of which is provided with a comparing means for comparing the output according to the amount of light received by the opposing pairs of light receiving means; Detection that turns on one of the two display elements and turns off the other when the amount of light received by the paired light receiving means is different, indicating which one has the weaker amount of light received, and lights both display elements when the amount of light received is the same. The number of display means equal to the number of pairs of light receiving means is provided, and a pulsation detection means for detecting a pulsation component from the output corresponding to the amount of light received by at least one of the light receiving means is provided, and the pulsation component is detected according to the output of the pulsation detection means. A vein exploration device comprising a pulsation display means for displaying the presence or absence of a component. (6) The vein exploration device according to claim 5, wherein the pulsation detection means is configured to operate when the amount of light received by a predetermined pair of light receiving means is the same.