KR200176108Y1 - Blood vessel search device - Google Patents

Abstract

The present invention relates to a measuring device of the medical equipment, the present invention is to generate an infrared ray by the supplied operating voltage to penetrate into the skin and collect the amount of infrared light returning by displaying the electrical signal according to the collected light amount By implementing a device to search for blood vessels in the skin, it is possible to obtain the effect of easily searching for blood vessels.

Description

Blood Vessel Search Device {BLOOD VESSEL SEARCH DEVICE}

The present invention relates to a measuring device of the medical device, and more particularly to a device for searching the blood vessels in the body difficult to observe.

Today, due to the high industrialization, the importance of the medical industry is emerging, and various medical equipments are being developed due to the development of the medical industry, for example, a device for detecting blood vessels.

Typically, when administering a vascular injection in a hospital, the needle is inserted into the blood vessel. At this time, it was not easy to insert the needle correctly by identifying the blood vessels as ducts. In particular, when it is difficult to identify blood vessels as ducts, such as children, the discomfort was increased. This discomfort will be more painful to the patient, and even those who practice medicine can be a tremendous pain.

For the above reasons, devices for searching for blood vessels in various forms have been implemented, and as a representative example, a device using lighting. Devices that use such light illuminate the skin and some penetrate into the skin to illuminate a small area under the skin. On the other hand, the peripheral vein is tightly chipped in the skin, and the peripheral vein does not absorb light well, so that it is easily projected by the black light by infiltrating illumination so that it can be easily recognized by the eye. An apparatus for searching for blood vessels using illumination as described above has already been proposed, and an example thereof is disclosed in the US patent 'UP 4,619,249'.

Briefly describing the U.S. Patent 'UP 4,619,249', a lighting device is mounted on two arm ends, and light is penetrated into the blood vessel by illuminating the skin by penetrating light into the skin through the mounted lighting device. It is proposed to be explored.

However, when searching for blood vessels using illumination as described above, there is an inconvenience that a measurer must observe the blood vessels through the canal. In addition, when the lighting is used, there is a disadvantage that can be affected a lot depending on the skin condition of the subject and the surrounding environment.

Accordingly, an object of the present invention for solving the above problems is to provide an apparatus for searching for blood vessels in the skin through infrared light.

Another object of the present invention is to provide a device for searching for blood vessels by infrared rays that penetrate the skin into infrared rays.

Still another object of the present invention is to provide an apparatus for converting received infrared rays into electrical signals and displaying the amount of current.

In order to achieve the above object, the present invention generates infrared rays by supplying an operating voltage supplied thereto, collects the amount of infrared rays returned after it penetrates into the skin, and displays blood vessels in the skin by displaying an electrical signal according to the amount of collected light. Suggest a device to search.

The blood vessel search apparatus of the present invention proposed above has a power supply unit for generating an operating voltage, a power switch for switching the supply path of the operating voltage by an operator's operation, and an operating voltage provided through the power switch. A light transmitting unit for transmitting the generated infrared rays into the skin, a light receiving unit for collecting infrared rays reflected from a predetermined depth in the skin and receiving them through a light receiving element, measuring the electrical signals, and amplifying and outputting the measured electrical signals; An indication meter for measuring a current value corresponding to an output of the light receiving part by inputting an operating voltage and an output of the light receiving part, a first variable resistor for adjusting the zero point of the indication meta by operation of the measurer, and the operating voltage And a buzzer for generating a buzzer sound by using the output of the light receiving unit as an input. A second variable resistor for adjusting the operating point of the buzzer, a power state display unit for measuring and displaying a low voltage state of the operating voltage as an input of an operating voltage provided through the power switch; And a third variable resistor for adjusting the reference voltage required for measuring the low voltage state.

1 is a view showing the appearance of the blood vessel detection apparatus according to an embodiment of the present invention.

2 conceptually illustrates a blood vessel detection principle according to an embodiment of the present invention;

3 is a view showing the internal configuration of the blood vessel detection apparatus according to an embodiment of the present invention.

Figure 4 is a view showing the state of the head in close contact with the skin during blood vessel detection according to an embodiment of the present invention.

Figure 5 discloses a preferred vessel detection method according to an embodiment of the present invention.

Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the reference numerals to the components of the drawings, it should be noted that the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or chip designer, and the definitions should be made based on the contents throughout the present specification.

First of all, the concept of a blood vessel detection device proposed by the present invention is to detect blood vessels by measuring the amount of light reflected back from infrared rays penetrating into the skin after irradiating light rays to the skin surface of the body part to detect blood vessels. It is to propose a device. At this time, the light rays that can be used to search for blood vessels should use the light that penetrates the skin and is reflected at a predetermined depth. An example of the light beam is infrared light, which is because the infrared light is a light beam having an invisible wavelength, unlike the disturbance light (sun, light, visible light), which can be received by an optical sensor and changed into a current.

According to an embodiment of the present invention, the appearance of the blood vessel search apparatus proposed above is as shown in FIG. 1. The outline of the blood vessel detector shown in FIG. 1 is divided into a head 110 and a main body 120. The head 110 and the main body 120 are connected by a length-adjustable pipe 116 to allow the head 110 to rotate at a predetermined angle. The head 110 is equipped with a plurality of projection lamp 112 and the light sensor 114 in close contact with the skin to search for blood vessels. The projection lamp 112 generates light rays, such as infrared rays, by an operating voltage provided from the inside, and the optical sensor 114 receives light rays, such as infrared rays, and converts them into electrical signals. Meanwhile, the main body 120 includes various buttons and switches for operating the blood vessel search apparatus, and display means for displaying the operation state and the measurement result. 1, power on / off buttons 126 and 128, input sensitivity control switch 130, light emission control switch 132, and an indication meta display window 122 are provided with various buttons, switches, and display means provided in the main body 120. , The power indicator lamp 118, the battery lamp 124 and the like are shown as an example. The power on / off buttons 126 and 128 are buttons used to start or stop the vessel detection device. The input sensitivity control switch 130 is a manual switch for adjusting the measurement level of the light beam to be measured through the above-described optical sensor 114. The light emission control switch 132 is a manual switch for adjusting the light transmission level of the light beams generated from the projection lamp 112 described above. The indication meta display window 122 is an example of display means for informing a measurer whether blood vessels are searched and displayed in the form of indicating the current magnitude of the electrical signal measured by the optical sensor 114. The power indicator lamp 118 indicates whether the blood vessel search apparatus is operated in a form of lighting or blinking according to the states of the power on / off buttons 126 and 128 described above. The battery lamp 124 indicates a state of a battery (not shown) that supplies power for the operation of the blood vessel search device. For example, when the voltage of the battery is an unsuitable level of operation, it lights red to indicate that the battery voltage is not suitable for operation.

As described above, the present invention uses the principle that when infrared rays are directed directly into the skin, infrared rays entering the skin are difficult to pass due to blood in the veins and are absorbed. The above-mentioned principle is conceptually shown on the drawing as shown in FIG. As can be seen in FIG. 2, when the infrared ray 214 is irradiated onto the skin 210, the infrared ray 214 penetrates into the skin 210. The penetrated infrared light 212 is reflected at a predetermined depth of the skin when the blood vessel 212 is not present inside the skin 210 and comes out of the skin. However, when the blood vessel 212 in the skin 210 is present, the infrared rays reflected and returned from a predetermined depth of the skin are blocked by the blood vessel and are not output outside. In the present invention, the infrared ray 214 is randomly generated and penetrates into the skin 210 to measure the reflected light 216 that is reflected at a predetermined depth of the skin, thereby implementing a device for detecting the blood vessel 212.

3 is a view showing a detailed configuration of the blood vessel detection apparatus according to an embodiment of the present invention. Referring to FIG. 3, a blood vessel detecting device to be implemented in the present invention is largely a light transmitting unit 310, a light receiving unit 320, a power supply unit (DC), a power state display unit 330, an indication meter 340, and a buzzer 350. ) And the like. The power supply unit DC is a configuration for supplying power required for normal operation of the blood vessel search device, and is illustrated as a DC voltage source having a predetermined voltage level in the drawing. The transmitting unit 310 receives a predetermined DC voltage from the power supply unit DC to generate light rays such as infrared rays. In this case, the transmitting unit 310 includes a configuration in which the level of the light beams is adjusted by the measurer. In the drawing, an example of a light transmitting unit 310 including a fixed resistor R1, a variable resistor VR1, and two infrared diodes LED1 and LED2 is illustrated. As described above, the VR1 is configured to allow the level of the light beams to be adjusted by the measurer. As an example, when the resistance of the VR1 is increased by a measurer's operation, the voltage supplied increases, thereby increasing the level of light rays generated by the LED1 and the LED2. On the contrary, when the resistance of the VR1 is reduced by the operator's operation, the voltage supplied decreases and the level of the light rays generated by the LED1 and the LED2 is reduced. This will correspond to the light emission control switch 132 described above with reference to FIG. On the other hand, the LED1, LED2 generates infrared light by the voltage adjusted through the VR1 as mentioned above. The light receiving unit 320 receives an external light beam, converts it into an electrical signal, and outputs the converted electrical signal. That is, the light beam (infrared ray) generated from the transmitter 310 described above is transmitted to the skin, and then receives the light reflected from the skin and returns to the electrical signal. At this time, the electrical signal that can be generated by the light receiving unit 320 should include a configuration for amplifying it to a predetermined level as weak. In the drawing, an example of the light receiving unit 320 including a light receiving element, a variable resistor VR2, two amplifying elements Q1 and Q2, and three fixed resistors R2, R3, and R4 is illustrated. As the light receiving element, an infrared sensor may be used when using infrared rays as light generated by the light transmitting unit 310 in the present invention, and the light receiving element used at this time may be a known electric element. The light receiving element generates an electrical signal having a level determined by the intensity of the received light beam. The VR2 is configured to adjust the input sensitivity of the reception light beam by the measurer. As an example, when the resistance of the VR2 is increased by a measurer's operation, the input sensitivity becomes sensitive. Otherwise, when the resistance of the VR2 is decreased, the input sensitivity is blunted. This will correspond to the input sensitivity control switch 130 described above with reference to FIG. Meanwhile, the two amplification elements Q1 and Q2 and the three fixed resistors R2, R3 and R4 described above amplify and output the electrical signal converted by the light receiving element to a predetermined level. The amplifying elements Q1 and Q2 may be implemented using transistors that are commonly used as amplifying elements in electronic circuits. Looking at the connection of the Q1, Q2, R2, R3 and R4 in more detail, the electrical signal supplied through the VR2 is applied to the base of Q1. The operating voltage of the power supply unit DC is supplied to the collector of Q1 through R2, and the emitter of Q1 is grounded through R3. The collector of Q1 is connected to the base of Q2 via R4, and the emitter of Q2 is grounded through R3 in the same way as Q1. On the other hand, the collector of Q2 is the output terminal of the light receiving unit 320. That is, the output of the light receiver 320 is determined by the operation of Q2, and the operation of Q2 is determined by the operation of Q1. Therefore, the output of the light receiving unit 320 will be determined by the amount of light (infrared rays) received by the light receiving element. The power state display unit 330 monitors the level of the DC voltage supplied from the power supply unit DC and performs an operation for notifying the measurer when the level is less than a predetermined level. One example of the power state display unit 330 includes a light emitting diode LED3, a variable resistor VR5, and a capacitor C1. The variable resistor VR5 is configured to allow a voltage level, which is a reference, to be monitored by the measurer to monitor the low voltage of the power supply unit DC. For example, if the resistance value of the VR5 is increased by the operator's operation, the level for detecting the low voltage will gradually increase, and if the resistance value is decreased, the level for detecting the low voltage will gradually decrease. The LED3 is forward biased by the voltage regulated and applied through the VR5 to operate only when a voltage greater than a desired level is applied to light a specific color light. In other words, when a voltage larger than the adjusted level is applied from the power supply unit DC, it is turned on and operates only. When the voltage of an inappropriate level is applied to operate the blood vessel detector, the operation is stopped to smoothly supply power to the measurer. You will be notified. The indication meter 340 receives power from the power supply unit DC, and displays a measurement current corresponding to the output current of the light receiving unit 320. That is, the indicator meta 340 is operated by the light receiving unit 320 for outputting a predetermined current by the amount of light received. On the other hand, the operating voltage of the indicator meta 340 is supplied through a variable resistor (VR3), the VR3 is configured to adjust the zero point of the indicator meta (340). That is, a measurer determines the zero point of the indication meta 340 by manipulating the VR3 to set an appropriate resistance value. The buzzer 350 receives power from the power supply unit DC through the variable resistor VR4, and the operation of the buzzer 350 is controlled by the output current of the light receiver 320. That is, the buzzer 350 is operated by the light receiving unit 320 for outputting a predetermined current by the amount of light received. On the other hand, the operating voltage of the buzzer 350 is supplied through the VR4 as mentioned above, the VR4 is to determine the operating point of the buzzer 350. In addition, the present invention has a power switch (SW) for determining whether to provide a blood vessel search device with a voltage output from the power supply unit (DC) in addition to the configuration described above. That is, the power switch SW corresponds to the power switch described above with reference to FIG. 1. That is, when the on is made by the operator's operation, the operation according to the present invention is performed by supplying the DC voltage of the predetermined level output from the power supply unit DC to the above-described components. In addition, in the present invention, a diode is provided between the output of the power switch SW and the output of the light receiver 320 to prevent the voltage supplied through the power switch SW from flowing into the output terminal of the light receiver 320. Connect so that (D1) is reverse biased. That is, the D1 is provided to prevent the indicator meta 340 and the buzzer 350 from malfunctioning due to a supply voltage.

4 is a diagram illustrating shapes in which the head 110 shown in FIG. 1 is in close contact with the skin during a blood vessel searching operation according to an embodiment of the present invention. 4 (a) and 4 (b) show that the force is biased to one side, and the front part of the head 110 is not evenly adhered to the skin, and part is lifted. In this case, the amount of light dispersed to the outside of the infrared rays generated by the light transmitting unit 310 increases, and the light receiving unit 320 cannot collect the maximum light amount, which is not preferable. The form disclosed in (c) of FIG. 4 shows an example in which the front part of the head 110 is in close contact with the skin. In this case, the maximum infrared rays generated by the light transmitting unit 310 may not only penetrate into the skin, but also the light receiving unit 320 may collect the maximum amount of light.

5 is a diagram conceptually illustrating a moving direction of a blood vessel search apparatus according to a blood vessel detecting operation proposed in an embodiment of the present invention. As shown in FIG. 5, the blood vessel search should be performed by moving the head 110 of the blood vessel search device to be perpendicular to the blood vessel predicted to exist.

Hereinafter, the operation according to an embodiment of the present invention will be described in detail with reference to the above-described configuration. First, the operation according to an embodiment of the present invention can be largely divided into a light transmission operation for generating infrared rays and a light receiving operation for notifying the measurement result by the received light rays.

First, a light transmission operation according to an embodiment of the present invention will be described.

Operation

When the power-on button 128 provided in the blood vessel search apparatus is operated by a measurer to search for blood vessels, the power switch SW shown in FIG. 3 is switched to switch the voltage of the power supply unit DC into the blood vessel search apparatus internal circuit. Supplied. The operating voltage supplied from the power supply unit DC is supplied to two infrared diodes, LED1 and LED2, through the fixed resistors R1 and VR1 constituting the transmitter 310. At this time, the measurer adjusts the voltage level supplied to the LED1 and the LED2 by operating the light emission control switch 132 shown in FIG. The adjustment of the voltage magnitude should be made in consideration of the skin condition of the subject and the surrounding environment. For example, if the skin color is light, the amount of light should be adjusted to be small. If the skin color is black, the amount of light should be adjusted to be large. The LED1 and the LED2 are turned on by the scaled voltage to generate infrared rays. In an embodiment of the present invention, a variable resistor VR1 is disclosed as the light emission control switch 132. That is, the measurer adjusts the voltage supplied to the LED1 and the LED2 by determining the resistance value of the VR1, and adjusts the amount of infrared light generated by the LED1 and the LED2 by the adjusted voltage. Adjusting the magnitude of the supply voltage by adjusting the resistance value of the VR1 will be known in the art, it will be apparent that the magnitude of the voltage supplied is determined by the infrared light. On the other hand, the infrared light amount control is required to allow the optimal measurement can be made according to the skin condition of the subject because the skin condition of the person to be measured is not the same as described above. For example, initially, the light amount adjustment switch 132 is positioned at the center so that the average amount of light may be generated, and if the skin is thin and white, the amount of infrared light generated is reduced by reducing the resistance value of VR1. On the contrary, when the skin is thick and dark, the infrared light is difficult to transmit, thereby increasing the resistance value of VR1 to increase the amount of infrared light generated. In addition, when the operation voltage supply from the power supply unit DC is started, the power state display unit 330 is linked with the operation of the light transmitting unit 310 described above. That is, the voltage supplied through the power switch SW is turned on by driving the light emitting diode LED3 through the variable resistor VR5 constituting the power state display unit 330 to supply the operating voltage. The meter will be notified. However, when the magnitude of the voltage supplied from the power supply unit DC is smaller than a predetermined measurement voltage, the LED3 blinks as a normal operation cannot be performed. The blinking of the LED3 means that the voltage supplied from the power supply unit DC is a low voltage. On the other hand, in order to check the low voltage state, as mentioned above, a predetermined measurement voltage is required, and the measurement voltage can be adjusted by VR5 included in the power state display unit 330. In addition, the VR5 may adjust the lighting luminance of the LED3 indicating the voltage drop.

When the infrared generation is made by the above-described operation, the measurer performs a blood vessel searching process. The measurement operation performed by the measurer will be described in more detail. When the infrared ray is generated, the measurer makes close contact with the skin to search for the front part of the head 110 to which the infrared ray is transmitted. At this time, care should be taken so that infrared rays are not emitted out of the front part in close contact with the skin. 4 discloses various examples in which the front part may be in close contact with the skin. 4 (a) and 4 (b) show that the force is biased to one side, and the front part of the head 110 is not evenly adhered to the skin, and part is lifted. The form disclosed in (c) of FIG. 4 shows an example in which the front part of the head 110 is in close contact with the skin. In addition, if the head 110 is in close contact with the skin too hard may interfere with the flow of blood may act as a cause of malfunction during blood vessel search. As described above, when the front part of the head 110 is in close contact with the skin, infrared rays generated by the transmitting part 310 are uniformly penetrated into the skin.

Meanwhile, when it is determined that the front part of the head 110 is in close contact with the skin, the measurer naturally moves the front part of the head 110 along the skin surface to start blood vessel detection. At this time, the direction of moving the front portion moves in the vertical direction of the expected blood flow, that is, blood vessels. A preferred example thereof is as shown in FIG. As can be seen from FIG. 5, the search is performed while reciprocating the front part of the head 110 in the vertical direction of the blood vessel 516 predicted. The traveling direction of the front portion of the head 110 may be represented as reference numerals 510, 512, and 514. In this case, the moving speed (search speed) of the front part of the head 110 moving along the skin surface may be preferably moved about 1 centimeter (cm) per second.

At this time, care should be taken not to be too bright by appropriately adjusting the brightness of the surroundings, remove foreign substances on the surface of the skin to search for blood vessels. The reason is that in too bright pixels (sun, incandescent bulb direct sunlight, etc.) may cause a malfunction during measurement due to the incorporation of infrared rays, in addition, removing foreign matter on the surface of the skin interferes with the movement of the head 110 of the vessel search device This is because the foreign matter may blur the light receiving device provided in the light receiving unit 320. Therefore, preferably, a distance of about 2 meters is preferable in a room with fluorescent lamp 40V × 2, and the skin to be measured should remove foreign substances. In addition, the part of the head 110 constituting the blood vessel search device to be in close contact with the skin should be careful not to rub the surface rough, such as iron plate, cement, and should be wiped with a soft cloth before use.

Infrared rays transmitted from the light transmitting unit 310 by the above-described operation of the measurer penetrate into the skin evenly. On the other hand, the infrared rays penetrated into the skin are reflected at a predetermined depth of the skin and come back in the reverse direction of the penetration direction. At this time, the reflected light is absorbed from the part except the obstacle in the skin such as blood vessel and the like, and is not output to the outside. Otherwise, the reflected light is output to the outside through the reverse direction of the penetration path. An example of the progress of the infrared rays penetrated into the skin can be seen as disclosed in FIG. Referring to FIG. 2, it can be seen that the infrared rays 214 that do not meet the blood vessels of the infrared rays reflected from the skin are output as they are, but the infrared rays hit by the blood vessels 212 are absorbed and output.

Next, the operation of determining whether blood vessels are searched by receiving infrared rays returned due to the aforementioned principles will be described in detail as follows.

Light receiving

The reflected light reflected and returned at a predetermined depth in the skin is collected by the light receiving unit 320 of the header 110 constituting the blood vessel detector. That is, the reflected light is applied to the light receiving element constituting the light receiving unit 320, and the light receiving element generates an electrical signal corresponding to the amount of light reflected. Therefore, at the site where the blood vessel is not present, the reflected light that is reflected back from the skin is collected by the light receiving element, but at the site where the blood vessel is present, the reflected light is absorbed and the reflected light is blocked or only a small amount of the reflected light is collected by the light receiving element. will be. That is, it can be said that the amount of light collected is differentiated by the presence or absence of blood vessels. The electrical signal generated by the quenching device is meant to include both current and voltage. When the light receiving element generates an electrical signal by the reflected light, a voltage is applied to the variable resistor VR2 by the electrical signal. Therefore, the voltage divided by VR2 is supplied to the bias voltage of Q1. Q1 is turned on or off by performing the switching operation by the bias voltage. That is, the Q1 controls the switching operation of the electrical signal converted by the light receiving element. In addition, even if the electrical signal is larger than the bias voltage required for the Q1 switching operation, the amplification degree of the Q1 is determined by the level of the applied voltage to change the level of the output voltage. The operation of Q2 is determined by the switching operation of Q1 and the output voltage level. If the Q1 is turned off due to the blood vessel, the Q2 is switched and a current path of the dotted line ⓑ is formed. However, when Q1 is turned on, Q2 is turned off to block the current path of dotted line ⓑ.

In summary, the operation of the light receiving unit 320 described above increases the voltage applied to the base of Q1 when there is no blood vessel. At this time, the voltage applied to the R4 side of the voltage supplied to R2, that is, the base of Q2 is relatively smaller than the voltage applied to R3, so that the current of the dotted line ⓑ is blocked. In contrast, when blood vessels are present, the voltage applied to the base of Q1 is lowered. At this time, the voltage applied to R4 among the voltages supplied to R2 is relatively increased to increase the current of the dotted line ⓑ. This is because the internal resistance of Q2 changes with the base voltage.

Meanwhile, the indicator meta 340 and the buzzer 350 operate by the path of the dotted line ⓑ which is blocked or formed by the above-described light receiving unit 320. The output of the light receiver 320 is provided as an input of the indicator meta 340 and the buzzer 350. The indication meter 340 indicates a predetermined current scale by the input of the light receiving unit 320. That is, when Q2 constituting the light receiver 320 is turned on, the indicator of the indicator meta 340 is moved by an operating voltage provided through VR3 for adjusting the zero point of the indicator meta 340. The movement of the indicator of the indicator meta 340 means that the presence of blood vessels has been detected. However, when the Q2 is off, the indication meta 340 cannot perform the operation as the operation voltage supply path is blocked. This means that no blood vessel is present in the skin currently performing blood vessel search.

In addition, the buzzer 350 generates a buzzer sound by the output of the input light receiver 320. That is, when Q2 is turned on, the buzzer sound is generated by the operating voltage provided through VR4 for adjusting the operating point of the buzzer 350. However, when the Q2 is off, the buzzer 350 may not perform an operation along the operating voltage supply path. The buzzer 350 also generates a buzzer sound when blood vessels are present in the skin currently being searched, such as the indication meter 340 described above. Otherwise, the buzzer 350 does not generate a buzzer sound.

Although not described in detail in the configuration and operation according to the embodiment of the present invention described above, a display device may be added to the head of the blood vessel search apparatus so as to display a measurement point by a request of a measurer or a vessel search. In this case, in order to drive the display apparatus by searching for blood vessels, a control program should be added along with a separate hardware configuration for performing control.

On the other hand, in the above-described embodiment of the present invention has disclosed an operation for measuring the blood vessel through the infrared rays reflected back from the skin. However, as another embodiment, the light penetrating into the skin using the reflected light without being absorbed by the blood vessel may be implemented using the principle that the light is reflected by the blood vessel and returned. In this case, the light receiving unit should be configured to perform an operation opposite to that of the light receiving unit 320 according to the embodiment of the present invention.

In addition, in the detailed description of the present invention disclosed above, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

As described above, the present invention uses a light ray having a wavelength other than light in measuring blood vessels, thereby improving the efficiency by implementing a blood vessel searching device that is less affected by the surrounding environment and the skin condition of the subject. have. In addition, since it is possible to search through the indication meta without vascular search, there is an effect of providing convenience for use.

Claims (3)

A power supply unit for generating an operating voltage, A power switch for switching the supply path of the operating voltage by an operator; A transmitter for transmitting infrared rays generated by inputting an operating voltage provided through the power switch into the skin; A light-receiving unit for collecting infrared rays reflected from a predetermined depth in the skin and returning them through a light-receiving element, measuring the electrical signals, and amplifying and outputting the measured electrical signals; An indication meter for measuring a current value corresponding to the output of the light receiving unit by inputting the operating voltage and the output of the light receiving unit; A first variable resistor for adjusting the zero point of the indicating meter by manipulation of the measurer; A buzzer for generating a buzzer sound by inputting the operating voltage and the output of the light receiver; A second variable resistor for adjusting the operating point of the buzzer by operation of the measurer; A power state display unit which measures and displays a low voltage state of the operating voltage as an input of an operating voltage provided through the power switch; And a third variable resistor for adjusting a reference voltage required for measuring the low voltage state by the measurer's operation. The method of claim 1, wherein the light transmitting unit, A third variable resistor for adjusting the amount of infrared light by varying the input operating voltage by the measurer; And at least one infrared diode for transmitting infrared rays generated by inputting the operating voltage provided through the third variable resistor into the skin. The method of claim 2, wherein the light receiving unit, An infrared sensor for collecting infrared rays reflected by blood vessels located in the skin and converting them into electrical signals; And at least one transistor configured to amplify and output the electrical signal converted by the infrared sensor by a predetermined degree of amplification.