KR20230133809A - Bedsore prevention mat - Google Patents

Abstract

The present invention relates to a bedsore prevention mat, comprising a circulation mat unit 100 having a plurality of ventilation holes 110 through which air is sprayed on the upper surface and an air supply line 120 connected to the ventilation holes 110 formed therein. ), an air fan 200 connected to one side of the circulation mat unit 100 and connected to the air supply line 120 to supply air to the air supply line 120, and the circulation mat unit 100 ) is detachable from the upper surface and includes a breathable mat unit 300 made of a breathable material. The present invention enables forced air flow to the patient's waist and helps the patient's blood circulation through micro-vibration, so it has the advantage of preventing bedsores in elderly or seriously ill patients who have difficulty changing their posture on their own.

Description

Bedsore prevention mat

The present invention relates to a bedsore prevention mat, and more specifically, to a bedsore prevention mat that has a blood circulation function for patients with bedsores and can prevent bedsores.

Bedsores mean that when continuous pressure is applied to a specific part of the body, oxygen is not supplied to that area and blood circulation is blocked, resulting in necrosis of skin tissue. At this time, if bacteria penetrate the necrotic skin tissue and spread throughout the body, leading to sepsis, it is life-threatening.

In addition, once a bedsore develops, it takes a long time to treat and requires a lot of care and attention, making it difficult for the patient, guardian, and those in charge of treatment and care.

It is known that the treatment time for bedsores is usually 1 to 7 days for stage 1 bedsores, 5 to 90 days for stage 2, 30 to 180 days for stage 3, and at least half a year or more for stage 4. Therefore, the best way to prevent bedsores is to prevent them, and bedsore prevention mats play a big role in preventing them.

However, since the conventional pressure ulcer prevention mat consists of an air mat that can spray air and adjust air pressure, its effect is very minimal, and when using the air mat, there are cases where the hose through which air is injected becomes twisted or does not inject properly, causing it to not work. Additionally, air mats increase patient stress and discomfort due to noise and vibration generated when air is injected.

In fact, air mats frequently broke down after one year of use, causing problems with the air inflation method and air injection connection hose, and air loss due to the covering also occurred.

Announcement number: KR10-2310553 (Applicant: Ajou University Industry-Academic Cooperation Foundation)

One technical problem to be solved by the present invention is to provide a bedsore prevention mat that can prevent bedsores in elderly or seriously ill patients who have difficulty changing their posture on their own by enabling forced air flow to the patient's lower back.

Another technical problem to be solved by the present invention is to provide a bedsore prevention mat that can prevent bedsores by helping the patient's blood circulation through microvibration.

The technical problems to be solved by the present invention are not limited to those described above.

In order to solve the above technical problem, the present invention provides a bedsore prevention mat.

According to one embodiment, the bedsore prevention mat is connected to a circulation mat unit having a plurality of ventilation holes through which air is sprayed on the upper surface and an air supply line connected to the ventilation holes formed inside, and one side of the circulation mat unit, and the air The air fan is connected to the supply line and supplies air to the air supply line, and the circulation mat unit is detachable from the upper surface and includes a breathable mat unit made of a breathable material.

A piezoelectric element for generating vibration is provided on the upper surface of the circulation mat unit.

The piezoelectric element is manufactured by containing carbon nanotubes, and the carbon nanotubes are contained in the range of 4.0 wt% to 5.0 wt% based on the total weight of the piezoelectric element.

The ventilation hole is formed to correspond to at least one of the head, back, waist, and buttocks of the human body.

The breathable mat unit may be a smart mat with a heating function.

According to another embodiment, the piezoelectric element includes polydimethylsiloxane (PDMS) and carbon nanotubes (CNT), and the carbon nanotubes are 4.0 wt% or more and 5.0 wt% or less based on the total weight of the polydimethylsiloxane. may be included.

The present invention can maintain the temperature and humidity of the patient's waist in an optimal condition by controlling the temperature and humidity of the patient's waist through the forced flow of air sprayed through the ventilation holes of the circulation mat unit, and can relieve pressure ulcers in elderly or seriously ill patients who have difficulty changing their posture on their own. There is a preventive effect.

In addition, the present invention has the effect of preventing bedsores by helping blood circulation through microvibration generated by the piezoelectric element provided on the upper surface of the circulation mat. Moreover, since the piezoelectric element of the present invention contains carbon nanotubes, it has excellent electrical characteristics and excellent operational reliability, and exhibits both piezoelectricity and flexibility, which has the effect of providing comfort to lying patients.

1 to 3 are views for explaining a bedsore prevention mat according to a first embodiment of the present invention.
Figure 4 is a side cross-sectional view for explaining the operation of a bedsore prevention mat as a modified example of the first embodiment of the present invention.
Figures 5 to 12 are diagrams for explaining the piezoelectric element of the bedsore prevention mat according to the second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical idea of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the invention can be sufficiently conveyed to those skilled in the art.

In this specification, when an element is referred to as being on another element, it means that it may be formed directly on the other element or that a third element may be interposed between them. Additionally, in the drawings, the shapes and thicknesses of regions are exaggerated for effective explanation of technical content.

Additionally, in various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes its complementary embodiment. Additionally, in this specification, 'and/or' is used to mean including at least one of the components listed before and after.

In the specification, singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include" or "have" are intended to designate the presence of features, numbers, steps, components, or a combination thereof described in the specification, but are not intended to indicate the presence of one or more other features, numbers, steps, or components. It should not be understood as excluding the possibility of the presence or addition of elements or combinations thereof. In addition, in this specification, “connection” is used to mean both indirectly connecting a plurality of components and directly connecting them.

Additionally, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

1 to 3 are drawings for explaining a bedsore prevention mat according to a first embodiment of the present invention. Figure 1 is an exploded perspective view showing a bedsore prevention mat according to a first embodiment of the present invention, and Figure 2 is a drawing. 1 is a perspective view showing only the circulation mat unit coupled to the breathable mat unit, and FIG. 3 is a side cross-sectional view for explaining the operation of the pressure ulcer prevention mat according to the first embodiment of the present invention.

1 to 3, the bedsore prevention mat 10 according to the first embodiment includes a circulation mat unit 100, an air fan 200, and a breathable mat unit 300.

The circulation mat unit 100 has a plurality of ventilation holes 110 through which air is sprayed on the upper surface, and an air supply line 120 connected to the ventilation holes 110 is formed inside. The circulation mat unit 100 sprays air through the ventilation hole 110 to control temperature and humidity to prevent bedsores. The biggest causes of bedsores are pressure and humidity, and the solution to bedsores is pressure distribution and ventilation. The air jet enables air circulation, making it possible to control the temperature and humidity of the sweat-filled area.

The ventilation hole 110 may be formed in a mesh shape to enable fine air injection. When air is sprayed, it changes the location of pressure distribution in the body, making it more effective in preventing bedsores. Spraying fine air through the ventilation hole 110 may mean that cool air, that is, cool wind, is emitted. The air supply line 120 is intended to improve air flow.

As shown in FIG. 3, the ventilation hole 110 is formed to correspond to at least one of the head, back, waist, and buttocks of the human body. The head, back, waist, and buttocks of the human body are areas where bones come in contact with the mat, so bedsores are common. The ventilation hole 110 is formed at a location corresponding to a region where bedsores are likely to occur, and can prevent bedsores by maintaining ventilation by spraying air.

The air fan 200 is installed on one side of the circulation mat unit 100 and is connected to the air supply line 120 to supply air to the air supply line 120. The air fan 200 is a noiseless fan. If vibration and noise continue to occur, patient stress and discomfort will increase, so it is desirable to use a noiseless fan.

The circulation mat unit 100 is attached and detachable from the upper surface of the breathable mat unit 300. The circulation mat unit 100 is installed in the longitudinal direction at the very center of the breathable mat unit 300. When the circulation mat unit 100 is attached to the upper surface of the breathable mat unit 300, the ventilation holes 110 of the circulation mat unit 100 correspond to the head, back, waist, and buttocks of the human body. The patient lies down on the circulating mat unit 100 of the bedsore prevention mat 10, and bedsores are prevented by air sprayed from the ventilation hole 110.

The breathable mat unit 300 is detachable from the upper surface of the circulation mat unit 100 and is made of a breathable material. The breathable mat unit 300 may be a smart mat with a heating function. The heating function can be temperature controlled in multiple stages. The heating function of the breathable mat unit 300 can be performed with a heater coil embedded in the mat. The heater coil embedded in the breathable mat unit 300 has a heating function without electromagnetic waves.

The circulation mat unit 100 is detachable from the upper surface of the breathable mat unit 300, so when the circulation mat unit 100 is not needed, the circulation mat unit 100 is separated from the breathable mat unit 300, and the breathable mat unit ( 300) is available. Alternatively, the circulation mat unit 100 can be used in combination with another mat. The circulation mat unit 100 can be attached and detached from the breathable mat unit 300 using Velcro or magnetic force. When attached with magnetic force, attachment and detachment are easier and problems such as the circulation mat unit 100 sliding off the breathable mat unit 300 can be solved.

A piezoelectric element 400 for generating vibration is provided on the upper surface of the circulation mat unit 100. The piezoelectric element 400 is intended to help the patient's blood circulation by providing vibration. If you continue to lie in one position, the soft tissues around the bone protrusions are under constant pressure, causing side effects. The most common side effect is subcutaneous tissue damage (bedsores) due to circulatory disorders. When bedsores occur, they make treatment and daily life difficult for patients.

Pressure, friction, and shear forces are the main direct causes of bedsores, and excessive moisture is a factor that worsens bedsores. Currently, even in the United States, there is growing interest in the impact of skin damage caused by excessive moisture on the development of pressure ulcers. In the case of bedsores, the skin becomes necrotic due to constant pressure and blood not being able to circulate. Therefore, in the case of changes in posture or simple maintenance of ventilation, it is not a solution to the fundamental causative factor. Patients with bedsores need to constantly change their posture or take care of ventilation, etc. Therefore, the piezoelectric element provides vibration to help the patient's blood circulation.

More specifically, the temperature and humidity of the patient's waist are controlled and maintained in an optimal state through the forced flow of air sprayed through the ventilation hole 110 of the circulation mat unit 100, and the piezoelectric element 400 is generated. Shiki helps blood circulation through micro-vibration and prevents bedsores. The above-described bedsore prevention mat 10 is more efficient for blood circulation in bedsore patients who live alone.

The piezoelectric element 400 is formed with a communication hole 410 corresponding to the ventilation hole 110 of the circulation mat unit 100, so that even if the piezoelectric element 400 is provided on the upper surface of the circulation mat unit 100, the ventilation hole ( Ensure that air is sprayed smoothly through 110).

The piezoelectric element 400 may be formed in the form of a thin mat and placed on the upper surface of the circulation mat unit 100. Alternatively, the piezoelectric element 400 may form the upper surface of the circulation mat unit 100. In the first embodiment, the piezoelectric element 400 is described as an example of being attached to the upper surface of the circulation mat unit 100.

The piezoelectric element 400 uses a piezoelectric material with a piezoelectric effect, and is made of a material that has high output performance and is resistant to external shock or vibration.

The piezoelectric element 400 includes carbon nanotubes, and the carbon nanotubes are included in the range of 4.0 wt% to 5.0 wt% based on the total weight of the piezoelectric element. When carbon nanotubes are included in a piezoelectric element, low electrical resistance and excellent electrical properties can be secured.

Carbon nanotubes are tube-shaped materials in which hexagons made of six carbon atoms are connected to each other to form a tube shape. Carbon nanotubes have high electrical conductivity, high strength, and chemical stability. Additionally, carbon nanotubes conduct electricity well and are flexible like plastic. Carbon nanotubes are flexible and conductive even when the piezoelectric element is stretched, and can withstand a certain temperature, so their resistance does not increase even when stretched repeatedly.

If carbon nanotubes are included in less than 4.0 wt%, the content of carbon nanotubes is small and exhibit insulating properties, and if they are included in excess of 5.0 wt%, the effect is saturated. The piezoelectric element 400 containing 4.0 wt% to 5.0 wt% of carbon nanotubes has improved deterioration of electrical characteristics compared to the piezoelectric element 400 containing no carbon nanotubes.

More specifically, the piezoelectric element 400 can be manufactured by including carbon nanotubes in P(VDF-TrEE) nanofibers, which are ferroelectric organic polymer nanofibers. P(VDF-TrEE) nanofibers have excellent piezoelectric performance but have the disadvantage of low output, but the inclusion of carbon nanotubes improves piezoelectric performance. Carbon nanotubes have a significant output improvement effect above 4.0wt%.

Carbon nanotubes are harmless to the human body and are manufactured using an eco-friendly method, so they are harmless to the environment. In addition, P(VDF-TrEE) nanofibers and carbon nanotubes are flexible materials, so they are easy to apply to the curved human body. In other words, the piezoelectric element exhibits both piezoelectricity and flexibility and does not cause discomfort to the patient lying down.

When a patient lies down on the bedsore prevention mat 10, electricity is applied to the piezoelectric element 400 to vibrate to prevent bedsores, and air flow to the affected area becomes smooth, thereby preventing bedsores.

Alternatively, in the above-described circulation mat unit 100, air can be set to be sprayed through the ventilation hole 110 at regular intervals. Additionally, the piezoelectric element 400 can be set to generate vibration at regular intervals.

When air is sprayed to the patient's waist at regular intervals and micro-vibration is generated from the piezoelectric element, air is forced to flow to the patient's waist, and the micro-vibration helps the patient's blood circulation. It is possible to prevent bedsores in seriously ill patients. The bedsore prevention mat 10 described above is finished with a soft cotton material, allowing the patient to lie down safely and comfortably.

Figure 4 is a side cross-sectional view for explaining the operation of a bedsore prevention mat as a modified example of the first embodiment of the present invention.

As shown in FIG. 4, the pressure ulcer prevention mat 10 of the modified example of the first embodiment further includes a detection unit 510 and a control unit 520.

The sensing unit 510 may detect the temperature, humidity, and pressure between the patient lying on the bedsore prevention mat 10 and the mat and transmit the detected temperature, humidity, and pressure to the control unit 520. If the temperature, humidity, and pressure between the patient lying on the bedsore prevention mat 10 and the mat deviate from the set conditions, the control unit 520 operates the air fan 200 to spray air from the ventilation hole 110. Alternatively, the piezoelectric element 400 can be operated to generate fine vibration. The control unit 520 can control the intensity of air sprayed from the ventilation hole 110, and can also control the intensity of vibration at which the piezoelectric element 400 operates.

Meanwhile, the bedsore prevention mat 10 according to the second embodiment has a piezoelectric element made of polydimethylsiloxane (PDMS) and carbon nanotubes (CNT).

The bedsore prevention mat 10 according to the second embodiment is different from the first embodiment in the configuration of the piezoelectric element.

Piezoelectric elements are manufactured by mixing PDMS and carbon nanotubes, and the surface microstructure includes silicon and aggregates in the form of crystal grains.

The piezoelectric element is in the form of a thin mat. Piezoelectric elements can apply vibration using microcurrent of 1 to 100 Hz and directly stimulate and activate muscles in contact with the mat, causing muscle contraction and exercise. Piezoelectric elements can help exercise the muscles of patients who have difficulty moving by applying vibration using microcurrent.

Piezoelectric elements use PDMS to form flexible electrodes and carbon nanotubes to increase electrical conductivity.

PDMS is a silicone-based elastic material that has flexible properties, making it easy to attach to the skin. PDMS is a silicone polymer that has excellent elastic deformation, is harmless to the human body, and has a low dielectric constant.

Carbon nanotubes are included as conductive additives. Carbon nanotubes can prevent PDMS from swelling and improve conductivity. Carbon nanotubes have high electrical conductivity, high strength, and chemical stability. Additionally, carbon nanotubes conduct electricity well and are flexible like plastic. Carbon nanotubes are flexible and conductive even when the piezoelectric element is stretched, and can withstand a certain temperature, so their resistance does not increase even when stretched repeatedly. In addition, carbon nanotubes have higher conductivity compared to carbon black, so the amount of conductive additives used can be reduced.

Carbon nanotubes are made of multi-walled carbon nanotubes. For example, carbon nanotubes may be made of multi-walled carbon nanotubes having three or more walls and ten or more walls. Multi-walled carbon nanotubes are carbon nanotubes made by forming several concentric circles. Multi-walled carbon nanotubes have good electrical conduction properties, can stretch long, have excellent mechanical properties, and are easy to synthesize in large quantities.

The crystal grain-shaped aggregate is the agglomeration of the silicon of PDMS and the carbon of carbon nanotubes. In addition to improving mechanical strength, aggregates in the form of crystal grains form a conductive network and improve electrical properties. Improving electrical properties means having low resistance and excellent electrical conductivity. The greater the number of aggregates in the form of crystal grains of silicon and carbon, the lower the resistance and the better the electrical properties. In other words, electrical properties are improved because carbon attaches to silicon and forms a network path. Agglomerates in the form of crystal grains are effective in preventing deterioration of PDMS because carbon nanotubes reinforce silicon particles.

The crystal grain-shaped aggregates have rounded edges. The round-shaped crystal grains reinforce the silicon particles and provide flexible properties as an elastic body, thereby solving the deterioration phenomenon.

The average particle size of the aggregate in the form of crystal grains is 30 ㎛ or more and 50 ㎛ or less. For aggregates in the form of crystal grains, if the average particle diameter is less than 30㎛, the network path formation is insufficient, so the effect of improving electrical properties is minimal, and if it exceeds 50㎛, the effect is saturated.

When manufacturing a piezoelectric element, carbon nanotubes (CNTs) are included in an amount of 4.0 wt% or more and 5.0 wt% or less based on the total weight of polydimethylsiloxane (PDMS). If the carbon nanotube content based on the total weight of PDMS is less than 4.0 wt%, aggregates in the form of crystal grains of silicon and carbon do not appear, and if it exceeds 5.0 wt%, aggregates in the form of crystal grains of silicon and carbon become stronger. However, the voltage does not increase significantly compared to the added amount. When the content of carbon nanotubes is less than 4.0 wt% based on the total weight of PDMS, the content of carbon nanotubes is small and has insulating properties.

In other words, if the piezoelectric element is manufactured to contain a carbon nanotube content of 4.0 wt% or more and 5.0 wt% or less based on the total weight of PDMS, low electrical resistance and excellent electrical properties can be secured.

Piezoelectric elements further include a curing agent in addition to PDMS and carbon nanotubes. The curing agent may be a general curing agent that cures PDMS. For example, Dow Chemical's Sylgard 184 may be used as the curing agent. PDMS and curing agent can be mixed in a weight ratio of 8:1 to 12:1.

The piezoelectric element manufacturing method includes the process of adding and mixing carbon nanotube powder to liquid PDMS, pouring the mixture of liquid PDMS and carbon nanotubes into a mold for manufacturing the piezoelectric element, and then curing it. Manufactures piezoelectric elements.

The process of adding carbon nanotube powder to liquid PDMS and mixing is performed for about 20 to 30 minutes. Carbon nanotube powder is added in a range of 4.0 wt% to 5.0 wt% compared to liquid PDMS. Mixing and mixing carbon nanotubes with PDMS in powder form is intended to induce uniform dispersion of the carbon nanotubes and ensure that the carbon nanotubes and PDMS are uniformly mixed.

After the process of adding and mixing carbon nanotube powder to liquid PDMS, a curing agent is further mixed into the mixture of liquid PDMS and carbon nanotubes, mixed, and then poured into a mold. In the process of pouring a mixture of PDMS and carbon nanotubes in a liquid state into a mold for manufacturing a piezoelectric element and then curing, curing is performed for about 30 minutes to 1 hour and 30 minutes.

The carbon nanotube manufacturing method synthesizes carbon nanotubes using a chemical vapor deposition method using a catalyst in a fluidized bed reactor in an inert atmosphere.

When carbon nanotubes are synthesized using chemical vapor deposition, transition metal nanoparticles act as catalysts, and it is important to form the nanoparticle catalyst well. The catalyst uses a catalyst formed on a porous ceramic support. The porous ceramic support can use materials such as alumina and silica, and alumina is preferably used.

The production of catalyst uses iron (Fe). The catalyst is manufactured using a wet impregnation method, and is synthesized using Iron(III) nitrate nonahydrate as a precursor for iron. The synthesized catalyst is tested on a small scale using a horizontal reactor before being used in a fluidized bed reactor. At this time, it is synthesized using ethylene gas as a carbon precursor, and the synthesis is carried out at a temperature of 750 to 850 degrees. When using a horizontal reactor, argon gas and hydrogen gas are simultaneously flowed through the horizontal reactor to optimize catalyst production. Carbon nanotubes are synthesized through an optimization process, and this catalyst is sent to a fluidized bed reactor to synthesize carbon nanotubes in grams.

The carbon nanotube manufacturing method described above has a yield of approximately 200% compared to the input catalyst, and the produced carbon nanotubes are of very high quality. As a result of Raman spectroscopic analysis, the manufactured carbon nanotubes showed an IG/ID ratio of up to 2, which is an indicator of the crystallinity of carbon nanotubes.

The carbon nanotubes prepared by the above method are mixed with PDMS and cured to produce a piezoelectric element.

Hereinafter, the improvement in electrical characteristics of the piezoelectric element according to the first embodiment will be explained through experimental results.

Experimental Example 1: Piezoelectric element using carbon black as a conductive additive: 40 wt% of carbon black relative to the total weight of PDMS was added to liquid PDMS, mixed for 30 minutes, and then liquid PDMS was placed in a mold for manufacturing the piezoelectric element. It is produced by pouring carbon black and hardening it for 1 hour.

Experimental Examples 2 to 6: Piezoelectric elements using carbon nanotubes as a conductive additive were obtained by adding carbon nanotubes to liquid PDMS in the range of 1.0 wt% to 10 wt% based on the total weight of PDMS, mixing for 30 minutes, and then piezoelectric elements. It is manufactured by pouring liquid PDMS and carbon nanotubes into a mold and then curing it for 1 hour. In Experimental Examples 1 to 6, a hardener was added before pouring into the mold.

Figures 5 to 12 are diagrams for explaining the piezoelectric element of the bedsore prevention mat according to the second embodiment of the present invention. Figure 5 shows the shape and electrical resistance of the piezoelectric element according to the amount of carbon black and carbon nanotubes added to PDMS. This is the photo displayed. Carbon black, carbon nanotube 1.0, carbon nanotube 2.5, carbon nanotube 4.0, carbon nanotube 5.0, and carbon nanotube 10.0 represent Experimental Examples 1 to 6, respectively.

As shown in Figure 5, in Experimental Example 1, 40 wt% of carbon black was added and the electrical resistance was measured at 0.2 kΩ. In Experimental Examples 2 and 3, 1.0 wt% of carbon nanotubes and 2.5 wt% of carbon nanotubes were added, respectively, and electrical resistance was not measured. Experimental Examples 2 and 3 were confirmed to have insulating properties due to their low carbon nanotube content. In Experimental Example 4, 4.0 wt% of carbon nanotubes were added and the electrical resistance was measured at 0.04 kΩ. In Experimental Example 5, 5.0 wt% of carbon nanotubes were added and the electrical resistance was measured at 0.03 kΩ. In Experimental Example 6, 6.0 wt% of carbon nanotubes were added, and the electrical resistance was measured at 0.028 kΩ.

As confirmed in experimental examples, as the amount of carbon nanotubes increased from 4.0 wt% to 10.0 wt%, electrical resistance decreased. When the amount of carbon nanotubes added was 4.0 wt% or more, the electrical resistance was lower than when 40 wt% of carbon black was added.

FIG. 6 shows microsurface images taken of the piezoelectric elements of Experimental Examples 1 to 4 of FIG. 5 using FE-SEM.

As shown in Figure 6, in Experimental Example 1 in which carbon black was added as a conductive additive, angular carbon was clearly observed and silicon was partially confirmed. Angled carbon appears to be disadvantageous in lowering electrical resistance.

In Experimental Examples 2 and 3, in which 1.0 wt% of carbon nanotubes and 2.5 wt% of carbon nanotubes were added, respectively, carbon was not visible on the surface of the piezoelectric element. Experimental Example 4, in which 4.0 wt% of carbon nanotubes were added, showed a noticeable tendency for agglomeration to occur, and as carbon nanotubes were added to 5.0 wt% and 10.0 wt% of carbon nanotubes, stronger aggregation and hardening were found.

In Experimental Example 4, Experimental Example 5, and Experimental Example 6, the aggregation is the aggregation of silicon and carbon nanotubes of PDMS. As cohesion increases, electrical resistance decreases and electrical properties improve. Additionally, cohesion is required to resolve the deterioration phenomenon. Compared to carbon black, carbon nanotubes are smaller in size and have a larger specific surface area, so they seem to cohere easily.

From the experimental results in FIG. 6, it can be seen that the electrical resistance is lowered at 4.0 wt% or more of carbon nanotubes having crystal grain-type aggregates where the silicon of polydimethylsiloxane and the carbon of the carbon nanotubes are aggregated.

FIG. 7 shows carbon component mapping images derived from the piezoelectric elements of Experimental Examples 1 to 4 of FIG. 5 using EDS.

As shown in Figure 7, in Experimental Example 1 in which 40wt% of carbon black was added as a conductive additive, 61.2wt% of carbon component was observed, and in the experiment in which 1.0wt% of carbon nanotubes and 2.5wt% of carbon nanotubes were added, respectively. Example 2 and Experimental Example 3 showed a tendency for carbon to increase from 16.4 wt% to 19.6 wt% as the addition amount increased. In Experimental Example 4, where 4.0wt% of carbon nanotubes were added, the carbon component was 21.4wt%, and in Experimental Example 5, where 5.0wt% of carbon nanotubes were added, the carbon component was 27.3wt%, and carbon nanotubes were 10.0wt%. In the case of Experiment 6 with this addition, the carbon component was 36.4 wt%, and an increase in the carbon component was found in carbon nanotubes above 4.0 wt%.

In Experimental Example 6, in which 10.0wt% of carbon nanotubes were added, the carbon component was reduced from 61.2wt% to 36.4wt% compared to Experimental Example 1 in which black carbon was added, but the electrical resistance decreased from 0.2 kΩ to 0.028 kΩ. It was measured to be 7 times lower. In other words, improved electrical resistance was measured with a low carbon content of 10.0 wt% of carbon nanotubes compared to the high carbon content of carbon black.

From the experimental results in FIG. 7, it is confirmed that the weight of the carbon component is not a factor that significantly affects lowering the electrical resistance.

FIG. 8 shows silicon component mapping images derived from the piezoelectric elements of Experimental Examples 1 to 4 of FIG. 5 using EDS.

As shown in Figure 8, in Experimental Example 1 in which 40wt% of carbon black was added as a conductive additive, 38.8wt% of silicon component was observed, and in the experiment in which 1.0wt% of carbon nanotubes and 2.5wt% of carbon nanotubes were added, respectively. Example 2 and Experimental Example 3 showed a tendency for silicon to decrease from 56.2 wt% to 54.9 wt% as the addition amount increased. In Experimental Example 4, in which 4.0wt% of carbon nanotubes were added, the silicon component was 50.2wt%, and in Experimental Example 5, in which 5.0wt% of carbon nanotubes were added, the silicon component was 47.2wt%, and the carbon nanotubes were 10.0wt%. In the case of Experiment 6 with this addition, the silicon component was found to be 37.4 wt%, and as the silicon component increased from 5.0 wt% of carbon nanotubes to 10.0 wt% of carbon nanotubes, the silicon component decreased from 47.2 wt% to 37.2 wt%.

From the experimental results of Figures 7 and 8, compared to Experimental Example 1 in which carbon black was added as a conductive additive, the amount of carbon in Experimental Example 6 in which 10.0wt% of carbon nanotubes was added as a conductive additive was weak, from 38.8wt% to 37.3wt%. Although it was significantly reduced, the electrical resistance was measured to be approximately 7 times lower, from 0.2 kΩ to 0.028 kΩ, confirming that the amount of silicon is not a factor that significantly changes the electrical resistance.

Figure 9 is a graph showing the correlation between the weight of the carbon component and electrical resistance in Experimental Examples 1 to 4 of Figure 5.

As shown in Figure 9, as the amount of carbon nanotubes increased, silicon tended to decrease, carbon increased, and electrical resistance decreased. Compared to the piezoelectric element added with carbon black, which has a high carbon content of 60 wt%, the piezoelectric element added with 4.0 wt% carbon nanotubes has a carbon content of 21.4 wt%, and an electrical resistance value of 0.04 kΩ is observed. The piezoelectric element added with carbon black with a high carbon content of 60wt% has an electric resistance value of 0.2 kΩ.

Figure 10 is a schematic diagram illustrating the electrical output of the piezoelectric elements of Experimental Examples 1 to 4 of Figure 5.

As shown in Figure 10, in order to measure the electrical characteristics through the electrical output test of the piezoelectric elements of Experimental Examples 1 to 4, the piezoelectric element is connected to a generator generating 50V output, and the output voltage generated from the piezoelectric element is measured. Measured using an oscilloscope.

As a result of the measurement, different output voltages were generated in the piezoelectric elements to which carbon black and carbon nanotubes were added.

FIG. 11 is an electrical output graph showing the electrical output results of the piezoelectric elements of Experimental Examples 1 to 4 of FIG. 5.

As shown in Figure 11, in Experimental Example 1, in which 40wt% of carbon black was added as a conductive additive, the electrical output was measured at 6.5V, and in Experimental Example 2, in which 1.0wt% of carbon nanotubes were added as a conductive additive, the electrical output was measured at 0.0V. In Experimental Example 3, in which 2.5 wt% of carbon nanotubes were added as a conductive additive, the electrical output was measured at 4.6 V. In Experimental Example 4, in which 4.0 wt% of carbon nanotubes were added as a conductive additive, the electrical output rapidly increased to 25.9V, and the electrical output value was measured to be about 3.98 times higher than in Experimental Example 1 in which carbon black was added.

In the case of piezoelectric elements containing 5.0wt% carbon nanotubes and 10.0wt% carbon nanotubes, similar highest voltages were observed, with electrical output ranging from 26.7V to 26.8V.

In the case of 4.0wt% carbon nanotubes, where the peak voltage suddenly increased, as a result of observation through FE-SEM, carbon and silicon began to aggregate beyond 30 micrometers, and as a result of observation through component analysis, carbon In piezoelectric elements measuring more than 20wt%, the electrical resistance was measured to be less than 0.04 kΩ, and an output voltage 3.98 times that of carbon black was observed. However, as the carbon nanotubes increased to 4.0 wt%, carbon nanotubes 5.0 wt%, and carbon nanotubes 10.0 wt%, the maximum voltage increased to 26.7 V and 26.8 V, but the output voltage did not improve significantly compared to the added amount. For the above reasons, it is most efficient to manufacture a piezoelectric element containing 4.0 wt% or more and 5.0 wt% or less of carbon nanotubes based on the total weight of polydimethylsiloxane for electrical conductivity and low resistance.

FIG. 12 is a graph showing the correlation between electrical resistance and output voltage in Experimental Examples 1 to 4 of FIG. 5.

As shown in Figure 12, in Experimental Examples 2 and 3, in which 1.0 wt% of carbon nanotubes and 2.5 wt% of carbon nanotubes were added, respectively, the maximum voltage was measured to be 5 V or less. In the case of a piezoelectric element containing 4.0 wt% carbon nanotubes, 5.0 wt% carbon nanotubes, and 10.0 wt% carbon nanotubes with an electrical resistance measured to be less than 0.04 kΩ, the output voltage suddenly increases, causing the carbon nanotubes and silicon to aggregate and form a round shape. When showing a true crystal grain type aggregate, it can be confirmed that it shows low resistance of less than 0.04 kΩ and high output characteristics of more than 25.9V.

From the above experimental results, it can be seen that a piezoelectric element showing improved electrical properties can be manufactured due to the high conductivity of carbon nanotubes and the agglomeration phenomenon with PDMS and high density.

The piezoelectric element manufactured by the above-described method may include a control unit (reference numeral 520 in FIG. 4) that adjusts the frequency of the microcurrent, and the control unit controls the oscillation frequency of the current provided from the power source to maintain the circuit and frequency. You can control time. By controlling the frequency of the microcurrent, the vibration can be changed in various ways, which can help the patient's blood circulation and help restore muscle strength in patients with reduced muscle mass.

Above, the present invention has been described in detail using preferred embodiments, but the scope of the present invention is not limited to the specific embodiments and should be interpreted in accordance with the appended claims. Additionally, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

10: Bedsore prevention mat 100: Circulation mat unit
110: ventilation hole 120: air supply line
200: Air fan 300: Breathable mat unit
400: Piezoelectric element 410: Communication hole
510: detection unit 520: control unit

Claims (5)

A circulation mat unit having a plurality of ventilation holes through which air is sprayed on the upper surface and an air supply line connected to the ventilation holes formed therein;
an air fan connected to one side of the circulation mat unit and connected to the air supply line to supply air to the air supply line; and
A breathable mat unit in which the circulation mat unit is detachable from the upper surface and made of a breathable material;
A bedsore prevention mat comprising: According to paragraph 1,
A breathable mat unit provided with a piezoelectric element for generating vibration on the upper surface of the circulation mat unit. According to paragraph 2,
The piezoelectric element includes carbon nanotubes,
The carbon nanotubes are
A bedsore prevention mat containing the piezoelectric elements in the range of 4.0wt% to 5.0wt% based on the total weight. According to paragraph 2,
The piezoelectric element is
Contains polydimethylsiloxane (PDMS) and carbon nanotubes (CNT),
The carbon nanotubes are
A bedsore prevention mat containing 4.0 wt% or more and 5.0 wt% or less based on the total weight of the polydimethylsiloxane. According to paragraph 1,
A bedsore prevention mat in which the ventilation hole is formed to correspond to at least one of the head, back, waist, and buttocks of the human body.