CN103211579B - Method of reducing power consumption of vein observation device - Google Patents

Abstract

A method for reducing the power consumption of a vein observation device, which divides the working process of the vein observation device into two stages: in the observation stage of observing and locating the vein in the early stage, switch the luminescent tube to work in the flashing light mode; In the puncture stage of puncturing, switch the luminous tube to work in continuous luminous mode. The invention realizes vein observation with lower power consumption of the luminous tube, has the positive significance of reducing power consumption, reducing heat generation, prolonging the service life of the luminous tube, and reducing eye damage to medical personnel.

Description

A method for reducing power consumption of vein observation device

technical field

The invention relates to a power saving technology of a medical device, in particular to a method for reducing power consumption of an auxiliary device during venipuncture.

Background technique

Vein puncture auxiliary observation device (referred to as venous observation device) is a new medical product that has appeared in recent years. It includes a host and a vein observation table for placing palms on the host for vein observation. The host includes light-emitting components and control circuits. The light-emitting components include: Light-emitting tubes and light-collecting devices. When working, the luminous tube emits red light as a light source, and irradiates the palm of the palm by focusing the light into a beam of light. The red light passes through the palm, because the red light is easier to pass through the muscle tissue of the palm and irradiates the back of the hand, and the palm veins flow The dark red venous blood has a strong absorption effect on red light, making it difficult for red light to penetrate the veins, so it appears on the back of the palm as darker vein traces under a brighter red light background, which is convenient for medical staff. Observing and locating veins, accurately realizing venipuncture, and is mostly used in the occasion of venipuncture for children.

According to the point of view of the prior art, since the physiological structure of the palm is relatively thick, in order to ensure that the red light of the light-emitting tube can penetrate the palm muscles and realize the recognition of the veins, the light-emitting tube must have a high luminous brightness so that the light-emitting component can irradiate the palm of the hand. The luminous flux in the palm is large enough. The working power of the luminous tubes of existing products often reaches about 20 VA, but such a large working power leads to the disadvantages of high power consumption, serious heat generation, and low working life of the luminous tubes. The red light will cause damage to the eyes of medical staff. This is a contradiction. The current technical direction to solve this contradiction is to use a luminous tube with higher luminous efficiency to obtain sufficient luminous brightness with a smaller working power, and a more advanced technology is to use a more sensitive CCD camera instead of the eyes. The light transmitted by the back of the palm is then displayed on the display screen. Although this can effectively reduce the brightness of the light-emitting tube, the technology is complicated and the cost is high, and it needs to be displayed on one side of the display screen. During venipuncture, since the operating point (the back of the palm) is not at the same position as the display screen, the operation is very unintuitive.

Contents of the invention

The purpose of the present invention is to disclose such a method capable of reducing the working power consumption of the luminous tube of the vein observation device.

After analyzing the actual use process of the vein observation device, even if the vein observation device is used, the observation and positioning of the palm veins cannot be completed at once: from the observation of multiple vein traces in the entire back of the palm at the beginning, to the analysis by medical staff And select one of the most suitable veins, and then accurately locate the vein, until the best venipuncture, which requires a long process. Especially when it is used for young children, young children often struggle with fear and move their palms wildly, and this process will take longer. However, in the existing vein observation device, strong red light is always irradiated during this process, which not only causes the light-emitting tube to consume a lot of power, generate serious heat, affect the life span, but also cause greater damage to the eyes of medical staff. The applicant has done some experiments on this. In the process of observing and looking for veins in the early stage, the red light was made to emit light in a flashing manner, and it was found that when the flashing period of the red light is within a certain range, it does not affect the observation and detection of the palm veins. Look, even at low red light levels, flickering makes it easier to notice subtle differences in the observed object.

The structure of the vein observation device of the present invention is the same as that of the prior art, including a host and a vein observation platform, the host includes a light-emitting component and a control circuit, and the light-emitting component includes a light-emitting tube and a light-condensing device. However, the present invention improves the working mode of the vein observation device, which includes using a light-emitting tube to emit an irradiation beam, and using the irradiation beam to penetrate the palm to form vein traces to perform vein observation and positioning and venipuncture. The improvement method is: the vein observation device The whole working process is divided into two stages: the observation stage of observing and positioning the vein in the early stage, and the puncture stage of puncturing the vein in the later stage; in the observation stage, switch the luminescent tube to work in the flashing light mode; in the puncture stage, the luminous Tube switching works in continuous light mode. According to the working principle of the venipuncture device, the illuminating beam is generally red light.

Specifically to realize the above improved method, the present invention controls the luminescent tube to work in the blinking mode through a blinking generating circuit outputting the blinking pulse, and controls the lighting tube to switch between the blinking lighting mode and the continuous lighting mode through a blinking switching switch.

The flicker pulse output by the flicker generating circuit to control the flickering of the luminescent tube is preferably a square wave pulse. The present invention has the effect of saving electricity. In order to save more than half of the electricity, the duty cycle can be set to be less than 0.5, that is, the pulse period when the light is on is smaller than the period when the light is not on, but it is difficult to observe if the light-emitting period is too small. It can be set between 0.2 and 0.4. between. As for the entire flickering cycle, if it is too long, the flickering will be too slow, which will affect the work efficiency; if it is too short, the flickering will be too fast and it will easily cause eye fatigue. According to actual use, it is more suitable between 0.3 seconds and 1.5 seconds, especially between 0.5 seconds and 1 Seconds are the best.

In the use of the vein observation device of the present invention, when the palm is placed on the observation platform at the beginning and the luminescent tube is started to emit red light, the luminescent tube is switched to the flashing light mode through the flashing switch, so that the luminous tube flashes visible to the naked eye. The working method of light emission (that is, light emission at intervals) emits light, such as emitting red light with a width of 0.25 seconds in a period of 1 second, (that is, the duty cycle is 0.25), this kind of flickering light is enough for medical staff to observe from the entire back of the palm Multiple vein traces, and then select one of the most suitable veins, and locate the vein. And when venipuncture needs to be performed at the end, if the light-emitting tube flickers, it will affect the puncture work. Therefore, the flashing switch switches the light-emitting tube to the continuous light-emitting state, so that the light-emitting tube emits light continuously and stably, which is in line with the use habits of medical staff. Medical staff performing venipuncture against a clear and stable background. Obviously, in the stage from starting the observation device to the puncture, since the luminous tube has been working at intervals in the way of flashing light, it can reduce the power consumption of the luminous tube, reduce heat generation, simplify the heat dissipation device of the luminous tube, and prolong the working time of the luminous tube. life.

The existing vein observation device generally also has a dimming function, and the brightness of the light-emitting tube is adjusted by a dimming circuit. This dimming function generally adopts pulse width modulation (PWM), which is actually a pulse working mode with adjustable duty cycle. However, the pulse working mode of this dimming function is completely opposite to the flickering lighting mode of the present invention. The dimming function needs to avoid flickering that can be perceived by the naked eye, so the pulse frequency is set very high, generally in the hundreds, several Thousands of hertz or even tens of thousands of hertz, that is, the light-emitting period is less than 0.00 seconds, and what the eyes see is an average continuous light. The flickering light of the present invention is to let the luminous tube work in a manner of flickering light visible to the naked eye (that is, to emit light at intervals), so that the luminous tube stops working during the light-emitting interval to reduce power consumption and heat generation.

In addition, the applicant also found that when the luminous tube flickers, the eyes have higher recognition sensitivity to the subtle differences of the observed object, (this is contrary to conventional understanding, it may be because the flicker makes the image of the observed object bright and dark, and when it is dark In order to see the object of observation, the eyes unconsciously enlarge the pupil, and then when the object of observation suddenly becomes brighter, the pupil has no time to shrink), that is, even if the brightness of the luminous tube is lower than that of the continuous light when it is flashing, it can still Effective observation and identification of veins. Therefore, as a further improvement, when the flicker switching switch activates the flicker generating circuit and the luminous tube is switched to the flashing lighting mode, the luminous brightness of the luminous tube is lowered at the same time. (About 20%-30% brightness can be lowered). This improvement makes the light-emitting tube emit light at a lower brightness when it is in the flashing light state at the beginning, further reducing power consumption, and restores the normal higher brightness when it is in the continuous light-emitting state, so that medical personnel can work in a more stable and clearer background. Perform venipuncture.

The invention divides the working process of the vein observation device into two stages. In the stage of observing and locating veins, the luminous tube is switched to the flashing luminescent state, and the vein observation is realized with lower power consumption of the luminous tube, which has the advantages of reducing power consumption, The positive significance of reducing heat, prolonging the life of the luminous tube, and reducing eye damage to medical staff. In the stage of venipuncture, the light-emitting tube is switched to the continuous light-emitting state, so that medical staff can perform venipuncture under stable and clear light, which is more in line with the usage habits and does not affect the puncture work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of an auxiliary observation device for venipuncture.

Fig. 2 is the circuit block diagram of the relevant control circuit of the luminous tube that realizes the method of the present invention.

Fig. 3 is the schematic circuit diagram of a kind of flicker generating circuit realizing the method of the present invention. the

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an existing venipuncture auxiliary observation device. It includes a host 1 of the vein observation device and a vein observation stand 2 on which palms are placed on the host 1 for vein observation. The host 1 is provided with a control circuit 3 and a power supply 4 . The control circuit 3 includes a PWM dimming circuit and a drive circuit for adjusting the brightness of the luminous tube; the control circuit 3 cooperates with the control panel to control the operation of the device and adjust the brightness of the luminous tube. A light-emitting assembly 5 composed of a light-emitting tube and a light-collecting device is arranged inside the host computer 1, which can emit high-brightness red light to the observation platform 2 above. There is a transparent light-transmitting plate 6 on the observation table 2 (the light-transmitting plate of some products is in the shape of a semicircle protruding upwards) and a detachable light-shielding plate 7. There is a light-transmitting hole 8 in the middle of the light-shielding plate 7, the size of which is equivalent to the palm of your hand. , so that the red light can only be emitted from the light-transmitting hole 8, and other positions are all blocked by the light baffle. The observation platform 2 is generally also provided with an induction switch 10 for identifying whether the palm is placed on the light shield 7. The induction switch 10 controls the work of the light-emitting assembly. When the induction switch 10 does not sense that the palm is placed on the light shield 7, the light-emitting assembly It does not work with light, and avoids the red light when there is no palm. When in use, the palm 9 that needs venipuncture is pressed down on the light shielding plate 7 of the observation platform 2, the sensor switch 10 recognizes this state, and the circuit is started to make the light-emitting component emit red light, and the red light passes through the light-transmitting plate 6 and the light barrier. The light-transmitting hole 8 on the light plate is irradiated on the palm of the hand, and the position of the vein can be clearly displayed on the back of the palm, which is convenient for medical workers to observe and locate the vein, accurately realize venipuncture, facilitate work and reduce the burden on children. pain.

Fig. 2 is a circuit block diagram for realizing the control circuit related to the luminous tube of the present invention. Among them, the dimming circuit, the driving circuit and the luminous tube belong to the prior art, and are used to make the red luminous tube installed in the luminous component emit high-brightness red light with adjustable brightness. And the flicker generation circuit and the flicker switch K are newly added circuits and parts of the present invention. A specific implementation circuit of these circuits is shown in FIG. 3 . IC1 is the base circuit 555 and other components to form a square wave oscillation circuit as a flicker generating circuit, and the high level period and low level period of the square wave pulse output by it are determined by capacitor C, resistors R1 and R2. According to the working principle of the 555 time base circuit, when the 555 is charging, the charging cycle T1 = 0.693 (R1 + R2) C = 0.693CR1 + 0.693CR2, at this time the output of the third pin is high, and the light is turned on through the driving circuit. The tube does not emit light (inversion control), that is, the charging period is the non-luminous period T1. When the 555 is in discharge, its discharge period T2=0.693CR2, at this time the output of pin 3 is low level, and the luminous tube is made to emit light through the driving circuit, that is, the discharge period T2 is the luminescence period. Since R1 is not zero, T2 is always smaller than T1, that is, the light-emitting period is always smaller than the non-light-emitting period, so the duty ratio of the light-emitting period to the entire pulse period is less than 0.5, and the power saving is more than 50%. A specific scheme, by selecting the values of capacitor C and resistors R1 and R2 (for example, C is 1 microfarad, R1 is 600K, R2 is 300K), and the discharge period, that is, the light-emitting period T2 is set to about 0.2 seconds, charging The cycle, that is, the non-light-emitting period T1 is about 0.6 seconds, the entire pulse cycle is 0.8 seconds, and the duty ratio of the light-emitting cycle is 0.25. In the flashing light-emitting state, the light-emitting tube saves about 75%, which is an ideal solution.

The blinking switch K is used to control the luminous tube to switch between the blinking lighting mode and the continuous lighting mode. As shown in Figure 3, when the flicker switching switch K is closed, the flicker generating circuit is energized to work, and its output flicker pulse signal controls the light-emitting tube to work in a flickering light-emitting manner through the drive circuit. When the flicker switch K is turned off, the flicker generating circuit cuts off the power supply and stops working, and no flicker pulse signal is output, so the light-emitting tube works in a continuous light-emitting mode.

The drive circuit required by the flicker generation circuit can use the drive circuit of the original dimming circuit, that is, the two share a drive circuit, as shown in Figure 2 and Figure 3 . You can also bring an independent drive circuit to drive the light-emitting tube together with the drive circuit of the dimming circuit. Of course, this will increase the cost of the circuit.

As a further improvement, the flicker switch K is connected to and controls the work of the dimming circuit at the same time, so that the dimming circuit is linked with the flicker switch. The dimming circuit lowers the brightness of the luminous tube (about 20%-30% of the luminance can be reduced) to further reduce power consumption; and when K disconnects the flickering circuit and the luminous tube is in a continuous light-emitting state, the alignment is lost at the same time. With the control of the light circuit, the luminous tube returns to normal higher brightness, enabling medical staff to perform venipuncture with a more stable and clearer background.

The blinking switching switch K can be set on the host control panel, and the blinking and continuous lighting modes can be switched by manual operation as required. As an improvement, the blinking switch K is installed below the vein observation platform 2, and is controlled by the palm pressure of the vein observation to be performed. For example, the blinking switch K adopts a normally closed pressure switch or a travel switch, and is installed under the vein observation platform 2, that is, the component 11 in FIG. . When the palm 9 is placed on the observation platform 2 with the light shield 7 and does not press down hard, the pressure of the light shield 7 is not enough at this moment, the flashing switch K is closed, and the luminescent tube is flashing and luminous, for the medical staff to observe and position the back of the palm When accurately locating the vein and preparing for puncture, the medical staff can press the palm 9 down slightly, then the light barrier 7 will press the linkage mechanism of the flashing switch K downward, disconnect the contact of K, and switch the light-emitting tube to In the state of continuous light, there is no need to manually operate the flashing switch, which is more convenient to use.

In addition, the flicker generating circuit of the present invention can also be realized by using other circuits such as digital circuits or special ICs, or even by using a microprocessor MCU. At this time, the flicker generating circuit can be combined with the dimming circuit, and realized with a microprocessor MCU or a mask-specific IC. At this time, although the circuit structure has changed from the surface, the IC still includes the functional modules of the dimming circuit and the flicker generating circuit, which are essentially the same as the present invention.

Claims (4)

1. reduce a method for power consumption of vein observation device, comprise and adopt luminous tube to send illumination beam, adopt illumination beam to penetrate palm and carry out vein observation location and venipuncture to be convenient to medical worker; It is characterized in that: the work process of vein observation device is divided into two stages: early stage medical worker to vein carry out observe location be called the observation stage, that punctures to vein later stage medical worker is called penetration phase; In the observation stage, luminous tube is switched in flashing mode and carry out work; In penetration phase, luminous tube is switched in continuous luminous mode and carry out work; Control luminous tube by a flicker circuit for generating output scintillation pulse and carry out work in flashing mode, control luminous tube by a flicker change-over switch and switch between flashing mode and continuous luminous mode;

Described flicker change-over switch is arranged on below vein observation platform, and flicker change-over switch, to the switching of luminous tube flashing mode and continuous luminous mode, is controlled by the pressure that will carry out the palm of vein observation.

2. a kind of method reducing power consumption of vein observation device according to claim 1, it is characterized in that: the flashing mode of described luminous tube, the flicker cycle of its flashing, between 0.3 second to 1.5 seconds.

3. a kind of method reducing power consumption of vein observation device according to claim 2, is characterized in that: the scintillation pulse that flicker circuit for generating exports is the dutycycle of square-wave pulse, its light period, is less than 0.5.

4. a kind of method reducing power consumption of vein observation device according to any one of claim 1 to 3, it is characterized in that: described method also includes the dimming function regulated luminous tube luminosity, when luminous tube is switched to flashing mode, turn down the luminosity of luminous tube simultaneously.