WO2021235865A1 - Stretchable near-infrared led band for smart healthcare - Google Patents

Abstract

The present invention relates to a stretchable near-infrared LED band for smart healthcare, and is intended to enable a surface mount device (SMD) for attaching a near-infrared LED to a stretchable substrate, wherein a material harmless to the human body is applied to eliminate side effects, comfort and ease of wear are increased, and economic burden is minimized. According to one embodiment, disclosed is a stretchable near-infrared LED band for smart healthcare, the band comprising: a stretchable substrate including a stretchable material; a plurality of stretchable electrodes formed on the stretchable substrate and printed in a straight-line pattern; a plurality of LED chips that are attached to the stretchable substrate and are for emitting near-infrared rays; and a plurality of stretchable solder parts including a stretchable paste and electrically connecting the LED chips to the stretchable electrodes, respectively.

Description

Stretchable Near Infrared LED Band for Smart Healthcare

An embodiment of the present invention relates to a stretchable near-infrared LED band for smart health care.

In 2020, the population aged 65 and over is expected to increase to 8.13 million, accounting for 15.7% of the total population (Koreans). It is increasing by an average of 6.6% every year. Accordingly, with the aging of the population, it is required to increase the healthy lifespan through medical services and health management.

The rate of increase in ordinary medical expenses (relative to GDP) rose 1.2% in 2016 compared to 2010, which is higher than the OECD average increase (0.2%). The total medical expenses for the elderly reached 28.32 trillion won last year, doubling from 14.135 trillion won in 2010. Our society, which is aging the fastest in the world, is facing serious social problems such as increased medical expenses for the elderly and the burden of health insurance budget deficits.

Among the chronic diseases of the aging elderly in 2017, neurological diseases such as osteoarthritis, rheumatoid arthritis, back pain, and sciatica accounted for 22% of all chronic diseases. Therefore, when calculated as a social cost, it is a loss of about 6.2 trillion won, and an average of 2.28 million won per individual is spent annually.

The research team at MIT University in the U.S. and the Institute of Physics and Chemistry in Japan are expanding their research areas from light therapy (LED Therapy)-related R&D to not only pain treatment, but also Alzheimer's and cancer, known incurable diseases, spurring the commercialization of future medical devices. is applying

More specifically, as the optical medical device industry continues to show a high growth rate, advanced countries such as the United States, Europe, and Japan have selected health and medical science and technology as one of the strategic industries of the 21st century and are promoting national intensive R&D programs. is expected to expand.

Until now, most marketable photodynamic devices are far-infrared therapy devices and light irradiators that have been clinically verified as existing light sources. Based on the safety evaluation standards for laser treatment devices using existing optical equipment, we are securing the safety of a new concept LED light source-based treatment device. are proceeding at the same time.

While foreign companies including 'Photon Therapeutics Ltd.' are competing in the global LED treatment device market, a small number of small companies are starting to launch their products in the domestic LED treatment device market. are working for

However, it is a pity that small businesses cannot afford to do so due to strict medical device regulations and laws in Korea compared to overseas.

The therapeutic effect of near-infrared LED is already well known, and it is further expanded to the field of Alzheimer's treatment research using it.

As described above, the clinical effect of near-infrared treatment has been proven and put to practical use through domestic and foreign researchers, but the reality is that it is difficult to always treat and maintain self-treatment (Self-Care) because most of them depend on hospitals or medical facilities.

As a result, the solution is to reduce the weight and spread of the near-infrared treatment device, and it should be designed with a focus on wearability so that the elderly can wear it at all times without any objection.

In an embodiment of the present invention, there is no side effect by applying a material harmless to the human body, the fit and convenience are increased, the economic burden is minimized, and a SMD (Surface Mount Device) for attaching a near-infrared LED to a stretchable and stretchable substrate is possible smart Provides stretchable near-infrared LED bands for healthcare.

A stretchable near-infrared LED band for smart health care according to an embodiment of the present invention relates to a near-infrared LED band for health care, comprising: a stretchable substrate including a stretchable material; a plurality of stretching electrodes formed on the stretching substrate and printed in a straight pattern; a plurality of LED chips attached to the stretched substrate for irradiating near-infrared rays; and a stretching paste, and a plurality of stretching solders respectively electrically connecting the LED chip and the stretching electrode.

In addition, the first LED chip protective layer comprising a stretchable material and including a plurality of caps formed to individually surround one of the LED chips and the stretched solder connected to each LED chip; and a second LED chip protective layer including a stretchable material and formed at a position corresponding to the first LED chip protective layer on the rear surface of the stretched substrate, respectively.

In addition, including a stretchable material, the stretchable substrate protective layer formed on the entire surface of the stretched substrate to cover the first LED chip protective layer, the second LED chip protective layer, and the stretched electrode may be further included.

In addition, the stretched electrode may include a first layer formed to have a first hardness by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material; a second layer formed to have a second hardness by mixing a conductive paste, a curing solvent, and a stretchable material; and a third layer formed by mixing a conductive paste, a curing solvent, and a stretchable material to have the first hardness, wherein the first layer is disposed as a lowermost layer, and the third layer is disposed as an uppermost layer, At least one or more layers of the second layer may be repeatedly disposed in a stacked structure of the first layer or the third layer.

In addition, the first hardness may be relatively lower than the second hardness.

In addition, the first hardness may be 50, and the second hardness may be 90.

In addition, each of the first layer and the third layer includes silver nanoparticles, a curing agent, and a thermoplastic polyurethane (TPU), and the second layer includes silver microparticles, a curing solvent, and a thermoplastic polyurethane (TPU). can do.

Also, a blending ratio of silver microparticles blended to form the second layer may be higher than a blending ratio of silver nanoparticles blended to form the first layer and the third layer.

In addition, each of the first layer and the third layer is formed by mixing 50% silver nanoparticles, 5% curing agent, and 45% thermoplastic polyurethane (TPU), and the second layer is silver micro It may be formed by mixing 70% of particles, 5% of curing solvent, and 25% of thermoplastic polyurethane (TPU).

In addition, the stretched solder is formed by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material, and the conductive paste may be formed by mixing different types of conductive pastes at different mixing ratios. .

In addition, the stretched solder may be formed by mixing silver microparticles, copper microparticles, a curing solvent (Gamma-butylrolatone), and thermoplastic polyurethane (TPU).

In addition, the stretched solder may be formed by mixing 50% silver microparticles, 10% copper microparticles, 15% curing solvent (Gamma-butylrolatone), and 25% thermoplastic polyurethane (TPU).

According to the present invention, by applying a material harmless to the human body, there is no side effect, the fit and convenience are increased, the economic burden is minimized, and a smart health care capable of SMD (Surface Mount Device) for attaching a near-infrared LED to a stretchable and stretchable substrate. It is possible to provide a stretchable near-infrared LED band for

1 is a cross-sectional view illustrating a detailed configuration of a stretchable near-infrared LED band for smart health care according to an embodiment of the present invention.

2 is a view showing a stretched electrode manufactured according to an embodiment of the present invention.

3 is a view showing a detailed configuration of a stretching electrode according to an embodiment of the present invention.

4 is a graph showing electrical characteristics of a stretched electrode according to an embodiment of the present invention.

5 is a view showing the state of the stretching solder connecting the LED chip and the stretching electrode according to an embodiment of the present invention.

6 is a graph showing the temperature change with time when the stretched solder manufactured according to the embodiment of the present invention is formed.

7 is a view showing a stretchable near-infrared LED band for smart health care manufactured according to an embodiment of the present invention.

1 is a cross-sectional view illustrating a detailed configuration of a stretchable near-infrared LED band for smart health care according to an embodiment of the present invention, and FIG. 2 is a view showing a stretched electrode manufactured according to an embodiment of the present invention, Figure 3 is a view showing the detailed configuration of the stretched electrode according to the embodiment of the present invention, Figure 4 is a graph showing the electrical characteristics of the stretched electrode according to the embodiment of the present invention, Figure 5 is according to the embodiment of the present invention It is a view showing the state of the stretched solder connecting the LED chip and the stretched electrode, FIG. 6 is a graph showing the temperature change with time when the stretched solder manufactured according to an embodiment of the present invention is formed, and FIG. 7 is an embodiment of the present invention It is a diagram showing a stretchable near-infrared LED band for smart health care manufactured according to an example.

Referring to FIG. 1 , a stretchable near-infrared LED band 1000 for smart health care according to an embodiment of the present invention includes a stretchable board 100 , stretchable electrodes 200 , and an LED chip. 300 , the bonding layer 400 , the stretched solder 500 , the first LED chip protective layer 600 , the second LED chip protective layer 700 , the stretched substrate protective layer 800 , and the light blocking pad 900 . It may include at least one.

The stretchable board 100 may include stretchable materials such as urethane, and may be manufactured with a stretch rate of 50% or more, but in this way, the stretchable board ( 100) is not limited to the material or material applied to, and the stretch rate of the manufactured substrate as described above, and may include a variety of materials and materials, and it is of course possible to manufacture and apply a substrate having a higher stretch rate.

The stretchable electrodes 200 may be formed on the stretchable substrate 200 and printed in a straight pattern. For example, the stretched electrode 200 is patterned in a straight line as shown in FIG. can be manufactured.

The stretching electrode 200 may have a multi-layer structure including a first layer 210 , a second layer 220 , and a third layer 230 .

The first layer 210 may be formed to have a first hardness by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material in different mixing ratios, and may be formed in the lowermost layer. As the electrode material applied to the first layer 210 of the present embodiment, it is preferable to use silver nanoparticles that are easy to solder and have excellent cost-effectiveness. However, in the first layer 210 of this embodiment, not only silver nanoparticles (Ag Nano Particles), but also silver nano wires (Ag Nano Wire), carbon nanotubes (carbon nanotubes), hybrid material electrodes, graphene electrodes (grapheme electrodes) ), conductive polymer (PEDOT/PSS) electrodes, etc. can be applied. In addition, the stretchable material applied to the first layer 210 is preferably a thermoplastic polyurethane (TPU) that is easy to stretch, but the stretchable material applied to the first layer 210 of this embodiment is used. It is not limited only to polyurethane, and various stretching materials can be applied.

The second layer 220 may be formed to have a second hardness relatively higher than the first hardness by mixing the conductive paste, the curing solvent (Gamma-butylrolatone), and the stretchable material in different mixing ratios. As the electrode material applied to the second layer 220 of the present embodiment, it is preferable to use silver microparticles that are easy to solder and have excellent cost-effectiveness. However, in the second layer 220 of this embodiment, not only silver micro particles (Ag Micro Particle), but also silver micro wire (Ag Micro Wire), hybrid material electrode, graphene electrode (grapheme electrode), conductive polymer (PEDOT/PSS) ) electrode, etc. can be applied. In addition, the stretchable material applied to the second layer 220 is preferably a thermoplastic polyurethane (TPU) that is easy to stretch, but the stretchable material applied to the second layer 220 of this embodiment is used. It is not limited only to polyurethane, and various stretching materials can be applied.

The third layer 230 may be formed to have a first hardness by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material in different mixing ratios, and may be formed in the lowermost layer. As the electrode material applied to the first layer 210 of the present embodiment, it is preferable to use silver nanoparticles that are easy to solder and have excellent cost-effectiveness. However, in the first layer 210 of this embodiment, not only silver nanoparticles (Ag Nano Particles), but also silver nano wires (Ag Nano Wire), carbon nanotubes (carbon nanotubes), hybrid material electrodes, graphene electrodes (grapheme electrodes) ), conductive polymer (PEDOT/PSS) electrodes, etc. can be applied. In addition, the stretchable material applied to the first layer 210 is preferably a thermoplastic polyurethane (TPU) that is easy to stretch, but the stretchable material applied to the first layer 210 of this embodiment is used. It is not limited only to polyurethane, and various stretching materials can be applied.

The stretching electrode 200 has a multilayer structure in which the first layer 210, the second layer 220, and the third layer 230 are combined,

More specifically, the first layer 210 is disposed as the lowermost layer, and the third layer 230 is disposed as the uppermost layer (wherein the first and second layers 210 and 230 are made of substantially the same material). at least one layer) and the second layer 220 may be repeatedly disposed in a stacked structure of the first layer 210 or the third layer 230 .

For example, referring to the enlarged part of the stretching electrode 200 in FIG. 3 , 'lowest layer [first layer 210] - middle layer [second layer 220 / third layer 230 / second layer] (220) / third layer 230 / second layer 220 / third layer 230 / second layer 220] - may be made of a multi-layer structure of the uppermost layer [third layer 230]' , in this case, it is important that the second layer 220 is interposed between the first layer 210 and/or the third layer 230 .

In the stretching electrode 200 according to the present embodiment, the mixing ratio of silver micro-particles mixed to form the second layer 220 is mixed to form the first layer 210 and the third layer 230 . It can be set higher than the mixing rate of particles.

For example, each of the first layer 210 and the third layer 230 is formed by mixing 50% silver nanoparticles, 5% curing agent (hardness 60), and 45% thermoplastic polyurethane (TPU). The second layer 220 is formed by mixing 70% silver microparticles, 5% curing solvent (hardness 60), and 25% thermoplastic polyurethane (TPU), and has a first hardness of 50. The first and third layers 210 and 230 and the second layer 220 having a second hardness of 90 may be formed, and more specific details thereof may be summarized in Table 1 below.

Electrode Layer	Raw material	mixing ratio	Hardness
Layer 1 (Low)	nano Ag Particles	50%	50
	Hardening solvent (Gama-Butylrolatone)	5%
	Layer 2 (High)	Urethane TPU (hardness 60)	45%	90
		micro Ag Particles	70%
		Hardening solvent (Gama-Butylrolatone)	5%
Urethane TPU (hardness 60)		25%
Layer 3 (Low)	nano Ag Particles	50%	50
	Hardening solvent (Gama-Butylrolatone)	5%
	Urethane TPU (hardness 60)	45%

Referring to Table 1, silver nanoparticles are applied to the conductive pastes included in the first layer 210 (Layer 1) and the third layer 230 (Layer 3), and the mixing ratio is 50%, respectively. and nano-sized particles are used, while the conductive paste included in the second layer 220 (Layer 2) is formed with Ag Micro Particles and the mixing ratio is 70%, so that the first and third The hardness of the layers 210 and 230 (Layer 1 and 3) is relatively lower than that of the second layer 220 (Layer 2).

In this case, even if fine cracks are generated in the second layer 220 (Layer 2) having high hardness as the stretching electrode 200 is stretched and a force is applied in the vertical direction, first and third having relatively low hardness A portion of the layers 210 and 230 (Layers 1 and 3) may penetrate the corresponding crack to maintain conductivity without breaking the stretching electrode 200 .

Conventional stretched electrodes are mostly manufactured in a serpentine shape to prevent mechanical shock (disconnection and cracking) of the electrode during expansion and contraction, but it is impossible to configure microelectrodes and various circuits during circuit configuration.

The stretched electrode 200 according to the present embodiment forms a multi-layer structure with different mixtures and hardnesses of the conductive paste and the stretchable material as described above, and is patterned in a linear shape of about 0.2 to 0.8 mm, so that it is more It may have an improved stretch rate.

Meanwhile, FIG. 4 is an experimental result for the stretched electrode 200 of this embodiment, and when comparing the characteristic curves, 'elongation vs. When looking at the 'resistance value change trend', the stretched electrode 200 of this embodiment based on 50% has a differentiated strength in that the resistance value changes very low compared to the conventional stretched electrode.

The near-infrared LED band 1000 to which the stretching electrode 200 having a resistance value having such an improvement in stretch rate (or elongation rate) and a low change rate is applied, wears a near-infrared LED treatment device for medical use like clothes, wears like a band, or like a pars. It can also be applied in the form of an attachment, which enables constant treatment and self-treatment even in the case of the elderly or the disabled without restriction of activity.

The LED chip 300 may be adhered to the stretched substrate 100 through a bonding material to irradiate near-infrared rays.

Every human tissue has a small power plant that regenerates cells, which is called mitochondria. It produces the energy of the human body, and medically, this energy is summarized as adenosine triphosphate, triphosphate, and ATP. Here, ATP is formed of oxygen and glucose, and is delivered to each tissue through capillaries. Most people with neurological diseases have problems with blood circulation. This is because ATP is not sufficiently provided through capillaries. In other words, when the mitochondria cannot fundamentally play the role of mitochondria, the mitochondria send pain signals to the brain, which is the background of pain, that is, the onset of neurological diseases. Mitochondria are very sensitive to light. In particular, when mitochondria are stimulated in the near-infrared band, ATP production increases, and pain is reduced by properly providing ATP to each tissue.

In addition, the light source energy of near-infrared light can penetrate 20 to 100 mm of human skin and tissue into the muscle tissue of blood vessels. At this time, the muscle tissue expands and relaxes the diameter of the blood vessel to facilitate the blood flow of the blood vessel, so that it is possible to treat inflammation.

Overall, near-infrared light therapy restores oxidized tissue due to increased blood circulation, and when it is repeatedly operated according to a certain rule, improved human sensitivity improves gait and sense of balance, and reduced pain relieves more comfortable activity. and be able to sleep. In particular, it can reduce burning pain, stinging pain, and even inflammation throughout the body.

The bonding layer 400 serves to adhere the lower surface of the LED chip 300 to the upper portion of the stretched substrate 100 , and may be formed by bonding with a bonding material and then curing.

The stretching solder 500 may electrically connect between the LED chip 300 and the stretching electrode 200, respectively, as shown in FIG. 5 .

In general, there is no choice but to use expensive overseas silver (Ag) bond as a method of mounting semiconductor devices on a heterogeneous electrode and pattern, and there is no other way than backing in a chamber. Although the method of backing in the chamber is common, if partial sintering is not completed due to inconsistent heat distribution and transfer, the solvent remains inside and is converted into a resistive component, which inevitably increases the electrode resistance (refer to : Ag bond 3.5~4.5 million won/Kg). A bigger problem is that the productivity is very low because backing is required at least at 130℃ or 160℃ for 1 hour or more. In this case, a neck point occurs and mass serial production is impossible.

In order to solve this problem, the stretched solder 500 according to the present embodiment is formed by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material, wherein the conductive paste includes different types of conductive pastes. It is preferable to be formed by mixing in different mixing ratios.

More specifically, the stretched solder 500 may be formed by mixing silver micro particles (Ag Micro Particles), copper micro particles (Cu Micro Particles), a curing solvent (Gamma-butylrolatone), and thermoplastic polyurethane (TPU). .

For example, the stretched solder 500 may be formed by mixing 50% silver microparticles, 10% copper microparticles, 15% curing solvent (Gamma-butylrolatone), and 25% thermoplastic polyurethane (TPU). can be, and more specific details can be summarized as shown in Table 2 below.

Solder Paste	Raw material	mixing ratio	Hardness
Screen Printing Type	micro Ag particles	50%	90
	micro Cu particles	10%
	Hardening solvent (Gama-Butylrolatone)	15%
	Urethane TPU (hardness 60)	25%

Accordingly, in the stretched solder 500 according to this embodiment, as shown in FIG. 6 , the temperature of the Y-axis gradually increased over time on the X-axis. The temperature profile was maintained for a certain period of time, and then increased again. As a result, the temperature profile gradually decreased. Accordingly, it can be confirmed that the soldering material is formed in a stable structure on the electrode without spreading or dispersing.

In order to solve the conventional soldering problem, SMD (Surface Mount Device) can be performed at 170° C. for about 100 seconds using nano solder paste. Through the low-temperature nano soldering method, both productivity and quality can be improved.

The first LED chip protective layer 600 is coated with a stretchable material formed to individually surround one LED chip 300 and the stretched solder 500 connected to each LED chip (hardness 60 or less, elasticity 50%) Hereinafter, transparent) may be formed into a plurality of cap structures. That is, the first LED chip protective layer 600 is formed for each LED chip 300 to form an island.

The stretchable material applied to the first LED chip protective layer 600 may include transparent and colorless polyurethane, but in this embodiment, various materials having transparent and colorless stretching characteristics as well as polyurethane are used. can be applied.

The second LED chip protective layer 700 is coated with a stretchable material at a position corresponding to the first LED chip protective layer 600 on the rear surface of the stretched substrate 100 (hardness 60 or less, elasticity 50% or less, transparent ) and can be formed respectively.

The stretchable material applied to the second LED chip protective layer 700 may include transparent and colorless polyurethane, but in this embodiment, various materials having transparent and colorless stretching characteristics as well as polyurethane are used. can be applied.

The stretchable substrate protective layer 800 is a stretchable material on the entire surface of the stretched substrate 100 so as to cover the first LED chip protective layer 600 , the second LED chip protective layer 700 and the stretched electrode 200 . This coating (hardness 30 or less, the same as the stretched substrate, transparent) can be formed.

The light blocking pad 900 may be formed such that an upper portion of the first LED chip protective layer 600 and a portion of the stretched substrate protective layer 800 covering the upper portion of the first LED chip protective layer 600 are exposed. The material may include the nonwoven fabric 5T, but in this embodiment, not only the nonwoven fabric but also various materials having elongation properties may be used. The light blocking pad 900 serves to block light from being emitted from the LED chip 300 to other than a portion of the first LED chip protective layer 600 and the stretched substrate protective layer 800 .

The stretchable near-infrared LED band for smart health care according to the present invention has no side effects by applying a material harmless to the human body, increases fit and convenience, minimizes economic burden, and is used for attaching a near-infrared LED to a stretchable and stretchable substrate. SMD (Surface Mount Device) is possible.

Claims (12)

1. It relates to a near-infrared LED band for health care,

   a stretched substrate including a stretchable material;

   a plurality of stretching electrodes formed on the stretching substrate and printed in a straight pattern;

   a plurality of LED chips attached to the stretched substrate for irradiating near-infrared rays; and

   A stretchable near-infrared LED band for smart healthcare, comprising a stretching paste, and comprising a plurality of stretching solders respectively electrically connecting the LED chip and the stretching electrode.
2. According to claim 1,

   a first LED chip protective layer including a stretchable material and including a plurality of caps formed to individually surround one of the LED chips and the stretched solder connected to each LED chip; and

   Stretchable near-infrared light for smart health care, comprising a stretchable material, and further comprising a second LED chip protective layer respectively formed at a position corresponding to the first LED chip protective layer on the rear surface of the stretched substrate LED band.
3. 3. The method of claim 2,

   Smart comprising a stretchable material and further comprising a stretched substrate protective layer formed on the front surface of the stretched substrate to cover the first LED chip protective layer, the second LED chip protective layer, and the stretched electrode Stretchable near-infrared LED band for healthcare.
4. According to claim 1,

   The stretched electrode is

   a first layer formed by mixing a conductive paste, a curing solvent (Gamma-butylrolatone), and a stretchable material to have a first hardness;

   a second layer formed to have a second hardness by mixing a conductive paste, a curing solvent, and a stretchable material; and

   A conductive paste, a curing solvent, and a stretchable material are mixed to include a third layer formed to have the first hardness,

   The first layer is disposed as a lowermost layer, the third layer is disposed as an uppermost layer, and the second layer is repeatedly disposed at least one layer in a stacked structure of the first layer or the third layer. Stretchable near-infrared LED band for smart health care.
5. 5. The method of claim 4,

   Stretchable near-infrared LED band for smart health care, characterized in that the first hardness is relatively lower than the second hardness.
6. 5. The method of claim 4,

   The first hardness is 50, the second hardness is a stretchable near-infrared LED band for smart health care, characterized in that 90.
7. 5. The method of claim 4,

   Each of the first layer and the third layer includes silver nanoparticles, a curing agent, and a thermoplastic polyurethane (TPU),

   The second layer is a stretchable near-infrared LED band for smart health care, characterized in that it contains silver microparticles, a curing solvent, and a thermoplastic polyurethane (TPU).
8. 8. The method of claim 7,

   Stretchable near-infrared light for smart health care, characterized in that the blending ratio of silver microparticles blended to form the second layer is higher than the blending ratio of silver nanoparticles blended to form the first layer and the third layer LED band.
9. 8. The method of claim 7,

   Each of the first layer and the third layer is formed by mixing 50% silver nanoparticles, 5% curing agent, and 45% thermoplastic polyurethane (TPU),

   The second layer is a stretchable near-infrared LED band for smart health care, characterized in that it is formed by mixing 70% silver microparticles, 5% curing solvent, and 25% thermoplastic polyurethane (TPU).
10. According to claim 1,

    The stretched solder is

    It is formed by mixing conductive paste, curing solvent (Gamma-butylrolatone), and a stretchable material.

    The conductive paste is

    A stretchable near-infrared LED band for smart healthcare, characterized in that it is formed by mixing different types of conductive pastes at different mixing ratios.
11. According to claim 1,

    The stretched solder is

    A stretchable near-infrared LED band for smart health care, characterized in that it is formed by mixing silver microparticles, copper microparticles, curing solvent (Gamma-butylrolatone), and thermoplastic polyurethane (TPU).
12. According to claim 1,

    The stretched solder is

    Stretchable near infrared rays for smart health care, characterized in that 50% silver microparticles, 10% copper microparticles, 15% curing solvent (Gamma-butylrolatone), and 25% thermoplastic polyurethane (TPU) LED band.

Images