CN106334272A - PWM driven LED light therapy device - Google Patents

Abstract

The invention belongs to the intersecting field of medical treatment and lighting technology, and in particular relates to an LED optical treatment device in a PWM driving mode. The device adopts advanced pulse drive control method and innovative non-planar heat-conducting silica gel, so that the output optical power density of the treatment equipment is higher than the effective treatment threshold, while the surface temperature is lower than the safety upper limit stipulated by relevant national regulations. Compared with the current laser and intense pulsed light medical technology, this device can meet the same curative effect, and the treatment process is safer and more comfortable. It has great potential for flexible skin-friendly phototherapy, which is in line with the future development trend of wearable medical devices.

Description

A kind of LED phototherapy equipment based on PWM drive

technical field

The invention belongs to the intersecting field of medical treatment and lighting technology, and in particular relates to an LED phototherapy device driven by PWM.

Background technique

In the medical field, using light to improve disease conditions is a very common treatment method. At present, laser technology and intense light pulse technology are widely used. The basic principle is: the skin surface or subcutaneous abnormal tissue absorbs the incident light strongly and the temperature rises locally in a short time, so that the cells are destroyed or gasified. Although such schemes have obvious immediate curative effects, they are invasive or destructive treatments, which will cause certain side effects on normal physiological tissues of the human body. In addition, irradiated patients often feel a certain burning sensation, which creates anxiety and fear that are not conducive to treatment.

However, more and more studies have shown that under certain conditions, there is no significant difference between laser and LED light of the same wavelength in terms of the regulation of cell biological activity. For example, some bands of LED red light and infrared light can greatly promote collagen proliferation, increase the proliferation rate of epithelial cells, accelerate scar recovery, and dilute pigmentation. It can be applied to women's stretch marks, surgical wound and tissue healing, facial acne, etc. In the field of skin medicine; blue light has a significant effect on inhibiting the secretion of melatonin, so it can improve seasonal depression (Seasonal Affective Disorder, SAD) caused by insufficient sunlight in winter, because the disease is characterized by the secretion of melatonin in patients The amount is too high. In addition, because the LED device itself is safe and long-lived, compact in structure, easy to control, wide in spectrum coverage, and a natural and comfortable cold light source, the emerging LED light source components replace lasers and strong light pulses for optical therapy, especially in the development of software. Skin-friendly portable phototherapy devices have great potential and broad prospects.

A large number of experiments have shown that when the output light power density of the therapeutic light source is greater than about 40mW/cm ² , a significant curative effect will be produced. However, due to the well-known heat dissipation problems of LEDs, when the optical power density is higher than the lower limit under conventional constant current driving, the surface temperature of the phototherapy equipment often easily exceeds the safe upper limit temperature stipulated by relevant national regulations. Therefore, the present invention utilizes the characteristics of easy digital control of LED devices, adopts PWM pulse driving mode, and combines novel and efficient heat dissipation equipment, so that the surface temperature of the treatment equipment is greatly reduced, thereby producing considerable treatment effects while also meeting safety standards, and can be applied in actual production.

Contents of the invention

The object of the present invention is to provide an LED phototherapy device driven by PWM.

The LED phototherapy device based on PWM drive proposed by the present invention is composed of medical silica gel layer 1, LED light source assembly 2, flexible circuit board 3, battery + PWM drive control box 4, non-planar heat-conducting silica gel 5 and waist and abdomen fixing belt 6, wherein : There is a groove on the waist and abdomen fixing belt 6, and a non-planar heat-conducting silica gel 5 and a flexible circuit board 3 are placed in the groove from bottom to top, and the medical silicone layer 1 is covered on the waist and abdomen fixing belt 6. The flexible circuit board 3 is connected to the battery + PWM drive control box 4 through wires; one side of the non-planar heat-conducting silica gel 5 is flat, and the other side is zigzag or wave-shaped, and the plane part of the non-planar heat-conducting silica gel 5 is connected to the flexible circuit board 3 Bonding, LED light source assemblies 2 are evenly distributed on the flexible circuit board 3 .

In the present invention, the LED light source assembly 2 is driven and controlled by the PWM pulse current signal generated by the battery + PWM drive control box 4. The peak optical power density of the signal is not lower than the average optical power density output value under the constant current driving mode, and can A long treatment period and a low duty cycle are used.

The phototherapy device of the present invention utilizes the advantages of narrow LED bandwidth, almost covering all visible light and infrared and ultraviolet bands, and easy control and adjustment of the peak spectrum, and adopts a special spectrum or spectrum combination that has been proved to have obvious curative effects by medical research, that is, a Or a combination of multiple high-quality LEDs to achieve targeted therapeutic effects on specific diseases.

The heat dissipation device of the LED light source assembly adopts non-planar heat-conducting silica gel, and its structural forms include but not limited to wavy and zigzag. The heat dissipation device can significantly increase the convection area between the internal device and the external air, thereby effectively enhancing the heat dissipation capability.

In addition, taking advantage of the advantages of compactness and smallness of LED devices, it can be produced as a large-area soft structure. Its supporting components include, but are not limited to, flexible circuit boards and flexible film silicone dodging layers. At the same time, combined with the above-mentioned non-planar heat-conducting silica gel and PWM pulse driving method, the surface temperature of the treatment equipment is lower than the safe upper limit temperature of 42°C stipulated by the relevant national regulations, so that it can be applied to skin-friendly wearable treatment.

The beneficial effects of the present invention are as follows: firstly, high-quality LED is used to replace laser and strong light pulse technology. LED emits soft light stimulation, and its photodynamic process is non-invasive therapy, so it has no negative effects on the patient's body and psychology. Secondly, using a more advanced and flexible PWM driving method, combined with non-planar thermal silica gel, can not only make the output optical power density of the device higher than the effective treatment threshold, but also ensure that the surface temperature is lower than the upper limit specified by the national safety standard. Furthermore, due to the small and compact characteristics of the LED and its driver, the light therapy device is very suitable for flexible skin-friendly wearable therapy.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the PWM pulse driving mode of the light source assembly according to the present invention.

Figure 2 is an isolated component view of one possible configuration of the therapeutic device of the present invention.

FIG. 3 is a schematic diagram of two possible structures of the non-planar heat-conducting silicone heat dissipation layer of the present invention. Among them: (a) is zigzag type, (b) is wave type.

Fig. 4 is a schematic diagram of a feasible overall structure of the treatment device of the present invention.

Numbers in the figure: 1 is the medical silicone layer, 2 is the LED light source component, 3 is the flexible circuit board, 4 is the battery + PWM drive control box, 5 is the non-planar heat-conducting silica gel, 6 is the waist and abdomen fixing belt, 7 is the non-planar heat-conducting silica gel ( Sawtooth type), 8 is non-planar thermal silica gel (wave type).

detailed description

The technical constitution of the present invention will be described in detail below with reference to the accompanying drawings.

But the implementation of the present invention is not limited to the description here, and any changes and further improvements in the described embodiments, as well as those shown herein, are easily conceivable to those skilled in the art to which the present invention relates. Any further applications of the principles of the invention are also included. The same number that appears throughout the specification corresponds to the same constituent element.

Example 1:

FIG. 1 is a schematic waveform diagram of a PWM pulse driving mode of a light source assembly according to the present invention. Experiments have proved that due to the limitation of LED heat dissipation technology, the temperature rise of LEDs driven by constant current is serious, resulting in the surface temperature of the treatment equipment far exceeding the safety upper limit temperature stipulated by relevant national regulations under a certain output light power density. This problem can be effectively solved by using PWM pulse drive. According to needs, the pulse cycle frequency can be set higher than the fusion frequency of human eyes, so that the patient has the same perception of the output light under the two driving modes. Under this current pulse signal, the peak optical power density of the device is equal to (not lower than) the average optical power density output value under the constant current driving mode, so as to ensure the same (or even better) therapeutic effect. At the same time, a low duty cycle method can be adopted, that is, in a cycle, it is actually in a non-working state for a long time (within the t2 time period), which greatly reduces the heat dissipation requirements of the device. In addition, combined with an innovative non-planar thermally conductive silicone structure, it can effectively reduce the surface temperature of the device.

Fig. 2 is a schematic structural diagram of a possible structure of the treatment device according to the present invention. The device includes a medical silicone layer 1, an LED light source component 2, a flexible circuit board 3, a battery + PWM drive control box 4, and non-planar heat-conducting silicone 5. Wherein, the non-planar thermal conductive silica gel 5 includes but not limited to wave type and zigzag type, as shown in FIG. 3 . Because the treatment device is designed to be flexible, skin-friendly and wearable, in addition to the above core structural components, it should also contain wearable components, such as the waist and abdomen fixing belt 6 . The non-planar heat dissipation silica gel 5, the flexible circuit board 3, and the medical silica gel layer 1 are sequentially assembled on the waist and abdomen fixing belt 6 from bottom to top. The flexible circuit board 3 is equipped with an LED light source assembly 2. In actual use, the patient first uses an external power supply to charge the phototherapy device through the battery + PWM drive control box 4, and then fixes the phototherapy device to the site to be treated through the waist and abdomen fixing belt 6, as shown in the figure 4. After the device is started, the LED light source assembly 2 wired on the flexible circuit board 3 emits a light group with a certain intensity and wavelength that has a therapeutic effect. After mixing and uniform light through the medical silicone layer, it provides comfortable and safe treatment for patients.

Claims (2)

1. An LED phototherapy device based on PWM drive, which consists of medical silicone layer (1), LED light source assembly (2), flexible circuit board (3), battery + PWM drive control box (4), non-planar heat-conducting silicone (5 ) and waist and abdomen fixing belt (6), characterized in that: there is a groove on the waist and abdomen fixing belt (6), and a non-planar heat-conducting silica gel (5) and a flexible circuit are placed in the groove from bottom to top plate (3), the medical silicone layer (1) is covered above the waist and abdomen fixing belt (6), and the flexible circuit board (3) is connected to the battery + PWM drive control box (4) through wires; the non-planar heat-conducting silicone ( 5) One side is flat, and the other side is zigzag or wavy, the flat part of the non-planar heat-conducting silica gel (5) is bonded to the flexible circuit board (3), and LEDs are evenly distributed on the flexible circuit board (3) Light source assembly (2). 2. The LED phototherapy device based on PWM drive according to claim 1, characterized in that, the LED light source assembly (2) is driven and controlled by the PWM pulse current signal generated by the battery + PWM drive control box (4), and the peak value of the signal The optical power density is not lower than the average optical power density output value under the constant current driving mode, and the mode of long treatment period and low duty cycle can be adopted at the same time.