Posture estimation method and thermal massage mattress using same

Abstract

Provided is a thermal massage mattress capable of estimating the lying position of a person lying on a mattress by using a whole-body pressure measurement sensor and performing various treatments on the basis of the estimated posture of the person. This estimation method comprises: a measurement step of measuring pressure for each location through multiple pressure sensors arranged in a two-dimensional matrix; a body pressure characteristic extraction step of extracting a pressure value (force), a pressure-applied area, a peak pressure location, and an area mean pressure as proportional variables from the measured pressure information of the two-dimensional matrix; and a posture estimation step of estimating a lying position from the extracted variables through a posture estimation algorithm.

Description

Posture estimation method and thermal massage mattress using the same

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 2023-0144197, filed October 25, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a posture estimation method and a thermal massage mattress using the same.

[0003] Specifically, the present invention relates to a thermal massage mattress that can estimate the lying posture of a person lying on the mattress using a full-body pressure measurement sensor and perform various treatments based on the estimated posture of the person.

[0004] Technology is being developed to identify the posture of a person lying on a mattress and, based on this identified posture, induce a stable posture. Methods for determining posture include determining the numerical value and distribution of body pressure measured by the person on a two-dimensional flat mattress, filming and analyzing the person's motion, and combining these methods.

[0005] However, the developed pressure measurement method had the drawback of requiring the user to lie down with their head and legs facing a specific direction. Furthermore, the motion capture method limited the mattress placement for filming purposes and prevented the use of blankets.

[0006] Prior patent documents include KR2556341B1, KR2428899B1, KR2023-0045517A, KR2158201B1, and KR1950582B1.

[0007] The present invention has been devised to solve the above-described problem, and aims to provide a posture estimation method capable of estimating a user's lying posture regardless of the installation location or direction of a mattress.

[0008] In addition, the present invention seeks to provide a posture estimation method capable of accurately estimating a lying posture even when a user lies down freely without recognizing the direction in which he or she should lie down.

[0009] In addition, the present invention seeks to provide a posture estimation method capable of accurately estimating a user's lying posture.

[0010] In addition, the present invention seeks to provide a thermal massage mattress capable of providing a massage in response to the user's lying posture.

[0011] In addition, the present invention seeks to provide a thermal massage mattress that can identify a user's sleeping pattern in response to the user's lying posture and create the best sleeping environment.

[0012] In addition, the present invention aims to provide a thermal massage mattress that can prevent bedsores by measuring the user's lying posture.

[0013] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0014] The posture estimation method of the present invention for solving the above-described problem can be applied to a mattress on which a user can lie down and on which a plurality of pressure sensors arranged in a two-dimensional matrix are installed.

[0015] The above posture estimation method includes a measurement step of measuring pressure at each location through a plurality of pressure sensors arranged in a two-dimensional matrix form, a step of extracting body pressure characteristics from pressure information of the measured two-dimensional matrix, and a step of estimating a lying posture from the body pressure characteristics extracted through a posture estimation algorithm.

[0016] The above pressure characteristic extraction step includes extracting pressure location and pressure intensity as variables from measured pressure information.

[0017] The above variables may include at least one of a pressure value (force), a pressure action area (area), a peak pressure, and an area average pressure (mean pressure).

[0018] The above variables can be extracted as ratios.

[0019] By extracting as a ratio, body pressure analysis for people with different body types and weights can be performed without error.

[0020] The above posture estimation step estimates the lying posture from the extracted variables.

[0021] The above lying positions can be divided into supine lying position, prone lying position, and side lying position.

[0022] The above posture estimation algorithm can divide a two-dimensional matrix into multiple sections along the length (height) direction of a person from the body pressure characteristics.

[0023] The plurality of said sections may include a first section corresponding to the head, a second section corresponding to the shoulders, chest and back, a third section corresponding to the stomach and lumbar spine, a fourth section corresponding to the hips and thighs, and a fifth section corresponding to the calves and feet.

[0024] The section including the shoulder may be the second section.

[0025] The section including the buttocks may be the fourth section.

[0026] The section including the calf may be the fifth section.

[0027] The segmentation of the above section can be achieved through a learned algorithm.

[0028] The division of the above section can be made according to a specified body ratio.

[0029] The segmentation of the above section can be performed through a learned algorithm, and if the segmentation cannot be performed through the learned algorithm, it can be performed according to a specified body ratio.

[0030] The above posture estimation algorithm can estimate a lying posture by determining whether the body pressure characteristics of a predetermined section meet a predetermined judgment criterion.

[0031] The above posture estimation algorithm sequentially analyzes each section in a first scan direction from the head to the legs in the longitudinal direction, and during the analysis process of each section, analysis can be performed in a second scan direction extending left and right. In other words, the first scan direction can be the longitudinal direction, and the second scan direction can be the width direction.

[0032] The above judgment criteria may include whether the pressure application area in a given section is symmetrical left and right. Preferably, the criterion for the left and right symmetry may be an imaginary axis extending longitudinally through the head. The imaginary axis may be parallel to the first scan direction.

[0033] The above judgment criterion may include whether the highest pressure location exists within a given section. This judgment criterion may be whether the highest pressure location exists within the section, or whether the highest pressure location does not exist within the section.

[0034] The above judgment criterion may include whether the width of the pressure action area in a given section is greater than its length. This judgment criterion may be whether the length is greater than the width of the pressure action area in the section, or whether the width is greater than the length of the pressure action area in the section.

[0035] The above judgment criteria may include whether a pressure value is recognized as being higher than a reference value in a given section. This may include whether a pressure value is not measured in a given section or a pressure value is measured below a given value.

[0036] The above judgment criteria may include at least one of the judgment criteria described above.

[0037] The above posture estimation algorithm can determine whether the body pressure characteristic meets the estimation criteria in the estimation section, and if so, additionally confirm whether it meets the verification criteria in the verification section to specify the lying posture.

[0038] The above estimation section may include at least one of a section including the shoulder, a section including the lumbar spine, and a section including the hip and thigh.

[0039] Preferably, the section including the shoulder may be an estimation section for estimating a side-lying posture.

[0040] Preferably, the section including the lumbar spine may be an estimation section for estimating a supine posture.

[0041] Preferably, the section including the buttocks and thighs may be an estimation section for estimating the supine and prone positions.

[0042] The above verification section may include at least one of a section including the buttocks, a section including the buttocks and thighs, and a section including the calf.

[0043] Preferably, the section including the buttocks may be a verification section for verifying the side lying, supine and prone lying positions.

[0044] Preferably, the section including the buttocks and thighs can be a verification section to verify the supine position.

[0045] Preferably, the section including the calf may be a verification section for verifying the supine position.

[0046] The above posture estimation algorithm can specify the user's posture as a side-lying posture if the body pressure characteristic meets the estimation criteria for a side-lying posture in a section including the shoulder and meets the verification criteria for a side-lying posture in a section including the hip.

[0047] Preferably, the above estimation criterion may include that the pressure action area in the relevant section is asymmetrical left and right.

[0048] Preferably, the verification criterion may include that the highest pressure location exists in the section.

[0049] The above posture estimation algorithm can specify the user's posture as a supine posture if the body pressure characteristic meets the estimation standard of a supine posture in a section including the lumbar spine and meets the first verification criterion in a section including the calf.

[0050] Additionally, the posture estimation algorithm can specify the user's posture as a supine posture if the body pressure characteristic meets the second verification criterion of a supine posture in a section including the buttocks.

[0051] Preferably, the estimation criterion may include that, in the relevant section, the pressure value is recognized as being lower than or not recognized as a reference value.

[0052] Preferably, the first verification criterion may include at least one of the following: the pressure action area is symmetrical left and right in the section; and the length of the pressure action area is greater than the width.

[0053] Preferably, the second verification criterion may include that the highest pressure location exists in the section.

[0054] The above posture estimation algorithm can specify the user's posture as a supine posture if the body pressure characteristic meets the estimation criteria for a supine posture in a section including the buttocks and thighs and meets the verification criteria for a supine posture in a section including the buttocks and thighs.

[0055] Preferably, the above estimation criteria may include that, in the relevant section, the pressure action area is symmetrical left and right and the width of the pressure action area is greater than the length.

[0056] Preferably, the verification criterion may include that the highest pressure location exists in the section.

[0057] The above posture estimation algorithm can specify the user's posture as a prone posture if the body pressure characteristic meets the estimation criteria for a prone posture in a section including the buttocks and thighs and meets the verification criteria for a prone posture in a section including the buttocks.

[0058] Preferably, the estimation criteria may include that, in the relevant section, the pressure action area is symmetrical left and right and the length of the pressure action area is greater than the width.

[0059] Preferably, the verification criteria may include that the highest pressure location does not exist in the section.

[0060] The present invention provides a massage mattress in which the above-described posture estimation method is performed.

[0061] The above mattress includes a plurality of pressure sensors arranged in a two-dimensional matrix, and an operation control unit that extracts body pressure characteristics from pressure information measured from the pressure sensors and estimates the user's posture.

[0062] The above mattress can extract body information such as the user's body pressure distribution, height, and weight from information detected through the sensor, thereby distinguishing or identifying the user.

[0063] The above mattress may further include a massage device that is movable in a direction parallel to the two-dimensional matrix and movable in a direction intersecting the two-dimensional matrix.

[0064] The above massage ceramic may further include a heating function.

[0065] The above operation control unit can analyze changes in the user's sleep behavior from pressure information that changes over time.

[0066] The above-mentioned operation control unit can extract biosignals (heart rate, respiration rate, etc.) through changes in pressure measured from the user's pressure sensor. This can then be used to learn sleep patterns.

[0067] Through this, the four stages of sleep (wake-up, REM sleep, light sleep, and deep sleep) can be analyzed and provided as a report.

[0068] Through this, information on sleep disorders such as snoring and sleep apnea can also be provided in reports.

[0069] The above-mentioned operation control unit can perform temperature control in response to analyzed sleep behavior changes. Through this temperature control, an optimal sleep environment can be created or low-temperature burns can be prevented.

[0070] The above mattress may further include a temperature sensor for detecting the user's body temperature.

[0071] The above-mentioned operation control unit can control the temperature locally at a predetermined location on the mattress through the heating function of the above-mentioned ceramic. Furthermore, temperature control is also possible in a predetermined area or the entire area by moving the heating ceramic.

[0072] The above-mentioned operation control unit can identify a user based on pressure information measured by the pressure sensor. The pressure information can serve as a basis for extracting the user's physical information. Furthermore, the user's physical information can serve as a basis for identifying the user.

[0073] The above operation control unit can recommend a massage mode based on a specific user and the specific user's posture, and automatically set the position of the massage pot.

[0074] For example, the operation control unit may recommend or provide an optimal massage mode suited to the user's body pressure distribution. For example, the body pressure distribution may be related to the spine, the recommended massage mode may be a massage mode for the spine, and the massage mode may be determined by reflecting the body pressure distribution.

[0075] As another example, the operation control unit can learn the preferred modes of users with similar body pressure distributions using an artificial intelligence algorithm and provide the learned massage mode. Preferably, this mode can be one that focuses on massaging a specific area.

[0076] As another example, the operation control unit may set and provide a safety mode that is activated in response to a supine position, a prone position, or a side-lying position.

[0077] For example, the operation control unit can set the massage start point of the ceramic and the movement trajectory of the ceramic based on the extracted user's body pressure distribution.

[0078] The above operation control unit can, when it is confirmed from pressure information that changes over time that a portion of a predetermined area is continuously subjected to pressure exceeding a predetermined value, move the massage device to change the body position to prevent bedsores.

[0079] The pressure sensor may function as an interface for receiving user input signals. Preferably, the input signals may be input in a manner that allows the pressure sensor to detect the user's touch pressure. For example, if two consecutive touches are detected, the massage operation may be initiated or terminated. For example, if irregular continuous touches are detected, this may be considered an emergency and the massage operation may be immediately terminated.

[0080] From another perspective, the posture estimation method of the present invention includes a measurement step in which a pressure sensor measures pressure at each position through a plurality of pressure sensors arranged in a two-dimensional matrix, a body pressure characteristic extraction step in which an operation control unit extracts pressure position and pressure intensity as variables from the pressure information of the measured two-dimensional matrix, and a posture estimation step in which the operation control unit estimates a lying posture from the extracted variables through a posture estimation algorithm.

[0081] The above posture estimation algorithm can first partition the two-dimensional matrix into multiple sections along the length (height) direction of the person from the body pressure characteristics.

[0082] The above posture estimation algorithm can estimate the lying posture by sequentially determining whether the body pressure characteristics of each section of the matrix in the direction from the head to the legs meet a predetermined judgment criterion for multiple sections.

[0083] The above lying positions can be divided into supine lying position, prone lying position, and side lying position.

[0084] The above posture estimation algorithm includes analyzing body pressure characteristics in at least one of a plurality of sections along at least the width direction of the section.

[0085] The pressure characteristics in the above width direction may include whether the pressure action area is symmetrical or asymmetrical.

[0086] The pressure characteristics in the above width direction may include which of the length and width of the pressure action area is greater.

[0087] The analysis of the body pressure characteristics in the above width direction may include a judgment as to whether the pressure application area is asymmetrical left and right in the sections corresponding to the shoulder, chest, and back.

[0088] The analysis of the pressure characteristics in the above width direction may include a determination of whether the pressure application area is symmetrical left and right in at least one section corresponding to the buttocks and thighs and the section corresponding to the calf and foot.

[0089] The analysis of the pressure characteristics in the above width direction may include determining whether the length of the pressure application area is greater than the width in at least one of the sections corresponding to the buttocks and thighs and the sections corresponding to the calf and foot.

[0090] The analysis of the pressure characteristics in the above width direction may include determining whether the width of the pressure action area is greater than the length in the section corresponding to the hip and thigh.

[0091] The plurality of said sections may include a first section corresponding to the head, a second section corresponding to the shoulders, chest and back, a third section corresponding to the stomach and lumbar spine, a fourth section corresponding to the hips and thighs, and a fifth section corresponding to the calves and feet.

[0092] According to the posture estimation method of the present invention, the user's lying posture can be accurately estimated.

[0093] According to the posture estimation method of the present invention, the user's lying posture can be estimated regardless of the installation position or direction of the mattress.

[0094] According to the posture estimation method of the present invention, the lying posture can be accurately estimated even if the user lies down freely without recognizing the direction in which he or she should lie down.

[0095] The thermal massage mattress of the present invention is capable of providing a massage in response to the user's lying position.

[0096] The thermal massage mattress of the present invention can identify the user's sleeping pattern and create the best sleeping environment.

[0097] The thermal massage mattress of the present invention can prevent bedsores by measuring and continuously monitoring the user's lying posture and changing the user's posture using a ceramic.

[0098] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0099] Figure 1 is a drawing showing a state in which a user lies down on a mattress according to the present invention.

[0100] Figure 2 is a graph showing the distribution of body pressure measured by pressure sensors arranged in a two-dimensional matrix form in the lying state of the user of Figure 1.

[0101] Figure 3 is a graph showing a state in which the body pressure distribution is divided into multiple sections based on the body pressure distribution measured by the pressure sensor.

[0102] Figure 4 is a graph showing a state divided into multiple sections corresponding to the distribution of body pressure of a user lying in various postures. (a) shows a side-lying posture, (b) shows a supine lying posture, and (c) shows a prone lying posture.

[0103] Figure 5 is a flowchart of the posture estimation method of the embodiment.

[0104] Fig. 6 is a perspective view showing one embodiment of a heating ceramic applied to a mattress of the present invention and a guide rail guiding the same.

[0105] Figure 7 is a plan view of the thermal ceramic of Figure 6.

[0106] Figure 8 is a plan view showing a state in which the operation control unit aligns the thermal ceramic of Figure 7 to correspond to the user's lying posture.

[0107] Figure 9 is a side view of the thermal ceramic of Figure 8.

[0108] Fig. 10 is a perspective view showing the thermal ceramic in Fig. 6 enlarged and omitting the guide rail.

[0109] Figure 11 is a side view of Figure 10.

[0110] Fig. 12 is a side view showing the elevator in Fig. 11 in a raised state.

[0111] [Explanation of symbols]

[0112] 10: Massage mattress 11: Pressure sensor 20: Massage device 30: Drive device 31: Driving part 33: Guide rail 35: Driving body 36: Wheel 40: Lifting part 41: Lifting body R1: Lifting center 50: Thermal massage ceramic 51: Pivot arm R2: Pivot center R3: Rotation center 60: Operation control unit U: User L1: 1st section (head section) L2: 2nd section (shoulder-chest section) L3: 3rd section (stomach-waist section) L4: 4th section (hip-thigh section) L5: 5th section (calf-foot section)

[0113] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0114] The present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and with various modifications. However, these embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Therefore, the present invention is not limited to the embodiments disclosed below, but should be understood to include all modifications, equivalents, and substitutes included within the technical spirit and scope of the present invention, as well as substitutions or additions of the components of one embodiment with those of another embodiment.

[0115] The attached drawings are merely intended to facilitate understanding of the embodiments disclosed in this specification, and should not be construed as limiting the technical ideas disclosed in this specification, but should be understood to encompass all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention. In the drawings, the components may be expressed in exaggerated sizes or thicknesses for ease of understanding, but the scope of protection of the present invention should not be construed as being limited thereby.

[0116] The terminology used in this specification is only used to describe specific implementations or examples and is not intended to limit the present invention. In addition, the singular expression includes the plural expression unless the context clearly indicates otherwise. In the specification, terms such as "comprises" and "consists of" are intended to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification. In other words, it should be understood that terms such as "comprises" and "consists of" in the specification do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0117] While terms including ordinal numbers, such as "first" and "second," may be used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another. Therefore, unless otherwise stated, a "first" component may also be a "second" component.

[0118] When a component is referred to as being "connected" or "in contact with" another component, it should be understood that it may be directly connected or in contact with that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "in direct contact with" another component, it should be understood that there are no other components intervening.

[0119] When a component is referred to as being "above" or "below" another component, it should be understood that it is not only positioned directly above that other component, but that there may also be other components intervening there.

[0120] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0121] Throughout the specification, when reference is made to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when reference is made to "C through D", this means C or more and D or less, unless otherwise stated.

[0122] [Posture estimation method]

[0123] Hereinafter, with reference to FIGS. 1 to 5, a method for estimating a user's lying posture according to an embodiment of the present invention will be described.

[0124] The posture estimation method of the embodiment can be applied to a thermal massage mattress (10). The mattress (10) provides a rectangular flat floor on which a user (U) can lie down. The mattress (10) can be of various types, such as a fixed type, a folding / unfolding type, a roll / unroll type, etc., and the present invention does not limit the unfolding method of the mattress (10).

[0125] The above mattress (10) may have a plurality of pressure sensors (11) built into it in a two-dimensional matrix grid form. Accordingly, when a user is lying on the mattress (10), each pressure sensor (11) measures the body pressure applied to the corresponding area and provides it as an electrical signal to the operation control unit (60).

[0126] The above pressure sensor (11) may be a flexible pressure sensor so that the position of the pressure sensors cannot be determined even when the user (U) lies down.

[0127] The operation control unit (60) can analyze the body pressure distribution measured by the pressure sensor (11) to determine the user's longitudinal direction (height direction, height direction, first direction) and width direction (left-right direction, second direction). For example, the longitudinal direction may correspond to the direction in which the user's head and spine extend.

[0128] Referring to Figure 2, even when the user is lying at a slight angle, the operation control unit (60) can accurately determine the longitudinal and transverse directions by analyzing the user's body pressure distribution. It is self-evident that the above analysis and determination can occur even when the user lies with their head and legs facing opposite directions.

[0129] Referring to FIG. 3, the operation control unit (60) can analyze the body pressure distribution measured from the pressure sensor (11) and divide it into a plurality of sections connected in series along the first direction.

[0130] In the embodiment, it is exemplified that the above section is divided into five sections. The five sections may be a first section (L1) including the head, a second section (L2) including the shoulders, chest, and back, a third section (L3) including the stomach, waist, and lumbar region, a fourth section (L4) including the buttocks and thighs, and a fifth section (L5) including the calf.

[0131] However, the location of each section's divisions need not be limited to this. For example, the fourth section could include only the buttocks, or the fifth section could include not only the calf but also the foot.

[0132] The segmentation of the above section can be achieved through a learned algorithm. However, if segmentation cannot be achieved through the learned algorithm, it can be achieved according to a specified body ratio.

[0133] For example, the designation of the above body proportions can be based on the 'Korean Human Body Standard Information' database implemented by the National Institute of Standards and Technology of the Ministry of Trade, Industry and Energy. Specifically, referring to the database according to the '8th Human Dimension Survey Project', based on a man in his 30s, after recognizing the user's height, from the top to the bottom, that is, from head to foot, the first section can be 15%, the second section 16%, the third section 12.7%, the fourth section 28.8%, and the fifth section 27.5%, based on the top and bottom points in the direction of height.

[0134] The first section may be from the highest point where the body is recognized to the back of the neck, the second section may be from the back of the neck to below the breasts, the third section may be from below the breasts to the waist, the fourth section may be from the waist to the middle of the kneecap, and the fifth section may be from the middle of the kneecap to the lowest point where the body is recognized.

[0135] Referring to Figure 4, the characteristics of the pressure distribution in each section can be clearly distinguished depending on the user's lying posture. For reference, (a) represents the side-lying posture, (b) represents the supine posture, and (c) represents the prone-lying posture.

[0136] Section 1 (L1) can confirm that, in any case, a pressure action area exists in the central portion of the width direction. The operation control unit (60) can quickly determine the location of the head by identifying the characteristics of this pressure action area and use it as a reference.

[0137] In the second section (L2), the difference between the side-lying position (a) and the other positions (b, c) is clearly distinguished. Specifically, in the side-lying position (a), unlike the other positions, the pressure area corresponding to the shoulder is asymmetrical, and the pressure value is also clearly asymmetrical.

[0138] In the third section (L3), the supine position (b) is clearly distinguished from the other positions (a, c). That is, unlike the other positions, the supine position (b) has a small pressure value corresponding to the lumbar spine, and the pressure area is also very small.

[0139] Looking at the fourth segment (L4), the side lying position (a) and the supine lying position (b) have the highest pressure location in the buttocks, whereas the prone lying position (c) does not.

[0140] Looking at the fourth section (L4) again, the pressure action area and pressure value are symmetrical in the supine position (b) and the prone position (c), whereas the side lying position (a) is not.

[0141] Looking at section 4 (L4) again, in the supine position (b), the width of the pressure area in the left-right direction is longer than the length, whereas in the prone position (c), the length of the pressure area in the right-left direction is longer than the width.

[0142] Looking at the fifth section (L5), the supine position (b) has pressure values ​​and pressure action areas that are symmetrical on both sides, and the longitudinal length of the pressure action area is longer than the width on both sides, whereas the other positions (a, c) do not have these characteristics at all.

[0143] In order to clearly extract features that distinguish a specific posture from other postures and increase the reliability of the posture estimation result, the posture estimation method of the embodiment extracts the pressure value (force), pressure action area (area), peak pressure position, and area average pressure (mean pressure) as variables in the form of ratios from the pressure information of the measured two-dimensional matrix by the operation control unit (60).

[0144] Then, based on the characteristics of the extracted variables in each section, it is possible to accurately determine the user's lying posture.

[0145] Extracting as a ratio can be understood as applying relative values, rather than absolute values. For example, in a two-dimensional matrix pressure data measured from a 50-kg person, the pressure values ​​at each point may be generally lower than those at each point in a two-dimensional matrix pressure data measured from an 80-kg person. Estimating posture based on these different absolute values ​​for each person can lead to errors in the estimation process.

[0146] On the other hand, if variables are extracted as ratios, standardized variables can be derived regardless of differences in weight or body shape between these people. For example, the value of dividing the two-dimensional matrix pressure information measured from a person weighing 50 kg by 50 represents a certain ratio, and the value of dividing the two-dimensional matrix pressure information measured from a person weighing 80 kg by 80 also represents a certain ratio. If the variables of two people are extracted as ratios in this way, posture can be estimated from standardized variables regardless of the user's body shape or weight, thereby increasing the reliability of the posture estimation results.

[0147] The algorithm for estimating posture from these extracted variables is sequentially analyzed for each section in the first direction from the head toward the legs (first scan direction), as illustrated in Fig. 3, and additionally, during the analysis process of each section, analysis can be performed in the second direction corresponding to the width direction (second scan direction).

[0148] As will be described later, this scanning direction allows for the fastest and most accurate implementation of the posture estimation algorithm. This allows for the fastest detection of the side-lying position, while also allowing for the rapid sequential detection of the supine and prone positions.

[0149] This is because the estimation interval for each posture is placed close to the head, and if the estimation criterion is met in the estimation interval for each posture, other analyses can be skipped and it can be immediately checked in the verification interval whether the verification criterion is met.

[0150] The operation control unit (60) extracts the body pressure distribution data measured by the pressure sensor (11) as the previously described variable and estimates the posture according to the algorithm shown in Fig. 5.

[0151] First, in the first section (L1), it is determined whether body pressure is detected (S01). If head pressure is detected, it can be confirmed that there is no problem with the extracted variables, and the algorithm proceeds to the next step (S02). Conversely, if body pressure is not detected, this suggests the possibility of an error in the extracted variables, so a reset is performed and the algorithm terminates.

[0152] Next, in the second section (L2), it is determined whether the pressure value and pressure action area are symmetrical left and right (S02). The second section (L2) includes the shoulder and may be an estimated section for a side-lying posture.

[0153] If the variables extracted from the second section (L2) are asymmetrical, this provides evidence for assuming a side-lying posture. In other words, the criterion for estimating a side-lying posture is that the body pressure characteristics of the second section (L2) are asymmetrical.

[0154] If the pressure characteristics in the estimation section of the side-lying posture meet the estimation criteria, verification is performed (S03). This verification is performed by determining whether the highest pressure location exists in the section corresponding to the buttocks in the fourth section (L4) that includes the buttocks. In other words, the verification section of the side-lying posture is the fourth section (L4), and the verification criterion for the side-lying posture is that the highest pressure location exists in the section corresponding to the buttocks.

[0155] If the above verification criteria are met, the algorithm determines that the user's (U) lying position is a side lying position and terminates the algorithm.

[0156] On the other hand, if the above verification criteria are not met, data errors cannot be ruled out, a reset is performed, and the algorithm is terminated.

[0157] Meanwhile, if the variables extracted from the second section (L2) are symmetrical, it can be determined that this is not a side-lying posture, and the next step (S04) is performed.

[0158] The above step (S04) determines whether body pressure is recognized in the third section (L3) or whether the body pressure is below a predetermined value. If the body pressure of the lumbar spine is not recognized or is minimally recognized, this serves as a basis for assuming that the body pressure is in a supine position. In other words, the third section (L3) may be an estimation section for the supine position, and the fact that the body pressure is minimal or not recognized may serve as a criterion for estimating the supine position.

[0159] If the body pressure characteristics in the estimation section of the supine position meet the estimation criteria, verification is performed (S05). This verification step includes a procedure to verify that the body pressure distribution in the fifth section (L5) is symmetrical left and right and that the length is longer than the width of the pressure application area.

[0160] That is, the fifth section (L5) above may be a verification section for a supine position, and the left-right symmetry of the body pressure distribution and the longer pressure action area in the longitudinal direction may be verification criteria.

[0161] If the above body pressure distribution meets the verification criteria, additional verification (S06) is performed. This additional verification is performed by determining whether the highest pressure location in the fourth section (L4), which includes the buttocks, is located in the section corresponding to the buttocks. In other words, the additional verification section for the supine position is the fourth section (L4), and the additional verification criterion for the supine position is that the highest pressure location is located in the section corresponding to the buttocks.

[0162] If the above additional verification criteria are met, the algorithm determines that the user's (U) lying position is a supine position and terminates the algorithm.

[0163] On the other hand, if the above verification criteria are not met (S05), the next step (S07) of examining the pressure distribution characteristics of the fourth section (L4) is performed, and if the additional verification criteria are not met (S06), a data error cannot be ruled out, a reset is performed, and the algorithm is terminated.

[0164] If the pressure distribution in the fourth section (L4) is symmetrical and the length of the pressure area is greater than the width, it is estimated to be a prone position (S07). In other words, the fourth section (L4) becomes the estimated section for the prone position, and if it is symmetrical and the length of the pressure area is greater than the width, it becomes the estimation standard for the prone position.

[0165] If the prone position is estimated in step (S07), the verification step (S08) is performed. This step verifies whether the highest pressure location does not exist in the section including the buttocks in the fourth section (L4). In other words, the fourth section (L4) becomes the verification section for the prone position, and the absence of the highest pressure location becomes the verification criterion.

[0166] If there is no highest pressure location in the section including the buttocks in the above step (S08), the algorithm determines that the user's (U) lying position is a prone lying position and terminates the algorithm.

[0167] On the other hand, if the verification criteria are not met in the above step (S08), an error in the data cannot be ruled out, so a reset is performed and the algorithm is terminated.

[0168] Meanwhile, if the prone position is not estimated in the above step (S07), that is, if the pressure distribution is symmetrical on both sides and the width of the pressure application area is greater than the length, then it is estimated to be a supine position. That is, the fourth section (L4) becomes the estimated section for the supine position, and if it is symmetrical on both sides and the width of the pressure application area is greater than the length, it becomes the estimation standard for the supine position.

[0169] If the supine position is estimated in step (S07), a verification step (S06) is performed. This is accomplished by determining whether the highest pressure location in the fourth section (L4) including the buttocks is in the section corresponding to the buttocks. If the highest pressure location in the fourth section (L4) is in the section corresponding to the buttocks, the algorithm determines that the user's (U) supine position is the supine position and terminates the algorithm.

[0170] On the other hand, if not, a data error cannot be ruled out, a reset is performed, and the algorithm terminates.

[0171] According to the posture estimation algorithm discussed above, the estimation basis for each step is very clear and reliable. Furthermore, each step is performed in a sequence that allows for rapid and accurate assessment of the supine posture.

[0172] [Heated Massage Mattress]

[0173] Referring to FIGS. 6 to 12 below, a thermal massage mattress to which the above-described posture estimation method is applied will be described in detail.

[0174] A predetermined installation space is provided on the lower surface of the mattress (10) illustrated in FIG. 1, in which a massage device (20) illustrated in FIG. 6 is installed.

[0175] The above massage device (20) includes a thermal massage electrode (50) that contacts a body part of the user (U) that is in contact with the mattress (10) on which the user (U) is lying and applies thermal pressure to the user (U), a driving device (30) that moves the thermal massage electrode (50), and an operation control unit (60) that controls the driving device (30).

[0176] Referring to FIGS. 7 and 8, the operation control unit (60) can align the X-axis direction of the massage device (20) so as to correspond to the first direction of the body pressure distribution measured and analyzed from the pressure sensor (11). An embodiment exemplifies a method of aligning the X-axis direction with the first direction by moving at least one of one end and the other end of the massage device (20) in the X-axis direction in the Y-axis direction intersecting the X-axis.

[0177] The above-mentioned thermal massage ceramic (50) can reciprocate in the X-axis direction. The X-axis can extend parallel to the mattress (10). The above-mentioned thermal massage ceramic (50) can be raised and lowered in the Z-axis direction intersecting the mattress (10). The Z-axis can be orthogonal to a plane including the mattress (10).

[0178] The above driving device (30) includes an elevating unit (40) that moves the thermal massage ceramic (50) in the Z-axis direction and the opposite direction, and a driving unit (31) that moves the thermal massage ceramic (50) in the X-axis direction and the opposite direction.

[0179] The above driving part (31) includes a pair of guide rails (33) extending in the X-axis direction and spaced apart in the Y-axis direction orthogonal to both the Z-axis direction and the X-axis direction, and a driving body (35) that moves in the X-axis direction and the opposite direction along the guide rails (33).

[0180] The above guide rail (33) may be spaced apart in the Y-axis direction, for example, with the human spine in between. The Y-axis direction may be the left-right direction. The guide rail (33) does not have to extend straight in the X-axis direction. For example, the guide rail (33) may have a curve within a range substantially corresponding to the extension direction of the human spine.

[0181] The above driving body (35) may include wheels (36) that are spaced apart in the X-axis direction and whose movement is guided by the guide rail (33). That is, four wheels (36) may be provided, and may be provided in a form spaced apart in the X-axis direction from both ends of the driving body (35) in the Y-axis direction.

[0182] A thermal massage ceramic (50) is installed in the above-mentioned lifting member (40). The above-mentioned lifting member (40) is installed in the driving body (35) so that the thermal massage ceramic (50) can move relative to the driving body (35) in the Z-axis direction and in the opposite direction.

[0183] The above-described elevator (40) includes an elevator body (41) that rotates about an elevator center (R1) that extends in the Y-axis direction from the caudal end of the driving body (35) in the X-axis direction. When the elevator body (41) rotates about the elevator center (R1), the other end of the elevator body (41) in the X-axis direction substantially rises in the Z-axis direction as illustrated in FIG. 12 or descends in the opposite direction as illustrated in FIG. 11.

[0184] At the two (cranial) ends of the above-mentioned lifting body (41) in the X-axis direction, a pivot arm (51) is provided that pivots about a pivot center (R2) extending in the Y-axis direction. The pivot arm (51) extends from the pivot center (R2) in the X-axis direction and also in the opposite direction. The pivot arm (51) may extend in a "V" shape from the pivot center (R2).

[0185] At both ends of the pivot arm (51) in the X-axis direction, a pair of porcelains (50) are provided, each of which is rotatable about a center of rotation (R3) extending in the Y-axis direction. The imaginary axis of the center of rotation (R3) can pass through each of the porcelains (50).

[0186] The rotation center (R3) of the first conductor installed at the X-axis direction tail end of the pivot arm (51) is arranged between the pivot center (R2) and the elevation center (R1) in the X-axis direction. In addition, the pivot center (R2) is arranged between the elevation center (R1) and the rotation center (R3) of the second conductor installed at the two X-axis direction end ends of the pivot arm (51) in the X-axis direction.

[0187] The above ceramic may be a heater with a heating element built into it.

[0188] The driving motion of the above driving body (35) and the lifting motion of the lifting unit (40) can be controlled by the operation control unit (60). That is, the operation control unit (60) can move the thermal massage ceramic (50) in the Z-axis direction and the opposite direction, and can move it in the X-axis direction and the opposite direction, by controlling the driving device (30).

[0189] The embodiment exemplifies a structure in which an elevating body (41) is rotated about an elevating center (R1) of the other end in the X-axis direction to elevate one end in the X-axis direction of the elevating body (41) in order to move the thermal massage electrode (50) in the Z-axis direction and the opposite direction. However, in order to move the thermal massage electrode (50) in the Z-axis direction and the opposite direction, the elevating body (41) may be rotated about an elevating center (R1) of one end in the X-axis direction to elevate the other end in the X-axis direction of the elevating body (41). In addition, it is of course possible to slide the elevating body (41) in the Z-axis direction and the opposite direction with respect to the driving body (35) to move the thermal massage electrode (50) in the Z-axis direction and the opposite direction.

[0190] The above-described operation control unit (60) can extract, from the pressure information detected by the pressure sensor (11), not only the previously described extraction variables, but also body information such as the user's body pressure distribution, height, and weight. The above-described operation control unit (60) can also distinguish or specify the user through this.

[0191] The above-mentioned operation control unit (60) can analyze changes in the user's sleep behavior through changes in pressure information measured from the pressure sensor (11) over time. The changes in sleep behavior may include the user's tossing and turning or changes in lying posture.

[0192] The above operation control unit (60) can also extract biosignals (heart rate, respiration rate, etc.) through changes in pressure measured from the user's pressure sensor.

[0193] The above operation control unit (60) can learn the sleep pattern of the user (U) through data analysis as above.

[0194] The above operation control unit (60) can analyze the four stages of sleep of the user (U) through data analysis and sleep pattern learning as described above.

[0195] Sleep is divided into several stages, broadly divided into REM (rapid eye movement) sleep, in which the eyes move rapidly and wildly, and NREM (non-rapid eye movement) sleep, in which the eyes do not move rapidly.

[0196] REM sleep, characterized by rapid eye movement (REM) sleep, is the stage during which dreams occur and is characterized by irregular heartbeats and breathing. Neuroscientists claim that memories are stored during this REM sleep phase.

[0197] NREM sleep is further categorized into four stages, ranging from light sleep (stage 1) to deep sleep (stage 4), based on sleep depth. Sleep transitions from stages 1 and 2 through stages 3 and 4, ultimately leading to REM sleep. This process repeats three to five times per night.

[0198] While there's still controversy over whether REM or NREM sleep is deeper, fetal sleep is entirely REM. In adults, more than half of sleep is typically light NREM sleep, with less than 15% being deep sleep and around 25% being REM sleep.

[0199] The sleep state analyzed in this way can be provided to the user in the form of a report.

[0200] Additionally, through changes in body pressure as described above, information on sleep disorders such as snoring or sleep apnea can be analyzed and provided in reports.

[0201] The above operation control unit (60) can perform temperature control for optimal sleep or prevention of low-temperature burns in response to analyzed sleep behavior changes.

[0202] The above mattress (10) further includes a temperature sensor that detects the user's body temperature. The temperature sensor may be provided in an integrated form with the previously described flexible pressure sensor (11), or may be provided in the form of a separate layer laminated to the flexible pressure sensor (11).

[0203] The above operation control unit (60) can perform local temperature control for a predetermined location of the mattress (10) through the heating function of the ceramic (50).

[0204] In addition, the above-mentioned operation control unit (60) can control the temperature of a certain area of ​​the mattress (10) through the operation of periodically moving the thermal ceramics. According to this principle, it is obvious that temperature control of the entire area of ​​the mattress (10) is also possible.

[0205] The above operation control unit (60) can recommend a massage mode based on a user and the posture of the user identified through body pressure distribution analysis or body information such as weight and height.

[0206] The above operation control unit (60) can recommend or provide an optimal massage mode that suits the user's body pressure distribution.

[0207] Here, the above body pressure distribution may be a body pressure distribution related to the spine.

[0208] Here, the recommended massage mode may be a massage mode for the spine.

[0209] Here, the massage mode may be determined by reflecting the body pressure distribution.

[0210] The above operation control unit (60) learns the mode preferred by users with similar body pressure distribution using an artificial intelligence algorithm.

[0211] The above operation control unit (60) can provide the massage mode learned in this way.

[0212] The above operation control unit (60) can provide a mode for intensively massaging an optimal specific area in response to the body pressure distribution according to a specific user and his / her sleeping posture.

[0213] The above operation control unit (60) can set and provide a safety mode that is activated in response to a lying down position, a prone lying position, or a side lying position.

[0214] The above operation control unit (60) can automatically set the position of the massage pot (50) based on a user (U) and the posture of the user specified through body pressure distribution analysis or body information such as weight and height.

[0215] The above operation control unit (60) can set the massage start point of the ceramic (50) based on the extracted user's body pressure distribution and move the ceramic (50) to that position.

[0216] The above operation control unit (60) can set the movement trajectory of the ceramic based on the extracted user's body pressure distribution.

[0217] The flexible pressure sensor (11) of the above mattress (10) can function as an interface for receiving a user's input signal. The input signal can be input through the pressure sensor in a manner that the pressure sensor detects the user's touch pressure. For example, if the pressure sensor (11) detects two consecutive touches from the user (U), the operation control unit (60) can start or stop the massage operation of the ceramic (50). For example, if the pressure sensor (11) detects irregular, continuous touches from the user (U), the operation control unit (60) can recognize this as an emergency situation and immediately stop the massage operation of the ceramic (50).

[0218] Additionally, the above-mentioned operation control unit (60) continuously monitors pressure information that changes over time. If the operation control unit (60) confirms that a pressure higher than a predetermined value is continuously applied to a predetermined area during the monitoring, it can change the posture of the user (U) using the massage pot (50). This can prevent bedsores.

[0219] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0220] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

A measurement step in which a plurality of pressure sensors arranged in a two-dimensional matrix measure pressure at each location; A pressure characteristic extraction step in which the operation control unit extracts pressure location and pressure intensity as variables from the pressure information of the measured two-dimensional matrix; and A posture estimation method, comprising a posture estimation step in which the above operation control unit estimates a lying posture from extracted variables through a posture estimation algorithm. A method for estimating posture according to claim 1, wherein the variable includes at least one of a pressure value (force), a pressure action area (area), a peak pressure, and an area average pressure (mean pressure). A posture estimation method according to claim 1, wherein the variable is extracted as a ratio. In claim 1, the posture estimation algorithm is a posture estimation method that divides a two-dimensional matrix into a plurality of sections along the length (height) direction of the person from the body pressure characteristics. A posture estimation method according to claim 4, wherein the plurality of sections include a first section corresponding to the head, a second section corresponding to the shoulder, chest and back, a third section corresponding to the stomach and lumbar spine, a fourth section corresponding to the hip and thigh, and a fifth section corresponding to the calf and foot. In claim 4, the posture estimation algorithm is a posture estimation method that estimates a lying posture by determining whether a body pressure characteristic of a predetermined section meets a predetermined judgment criterion. In claim 4, the posture estimation algorithm is a posture estimation method in which analysis is sequentially performed for each section in the direction from the head toward the legs. In claim 4, the posture estimation algorithm is a posture estimation method including analyzing body pressure characteristics in the width direction of at least one section among a plurality of sections. A posture estimation method according to claim 8, wherein the body pressure characteristics in the width direction include information on whether the pressure action area is symmetrical or asymmetrical. In claim 8, A posture estimation method, wherein the pressure characteristics in the above width direction include which of the length and width of the pressure action area is greater. In claim 9, the analysis of the body pressure characteristics in the width direction includes a determination of whether the pressure action area is asymmetrical left and right in sections corresponding to the shoulder, chest, and back. A posture estimation method according to claim 9, wherein the analysis of the body pressure characteristics in the width direction includes determining whether the pressure action area is symmetrical left and right in at least one section corresponding to the hips and thighs and the section corresponding to the calf and foot. A posture estimation method according to claim 10, wherein the analysis of the body pressure characteristics in the width direction includes determining whether the length of the pressure action area is greater than the width in at least one section among the sections corresponding to the hips and thighs and the sections corresponding to the calves and feet. A posture estimation method according to claim 10, wherein the analysis of the body pressure characteristics in the width direction includes determining whether the width of the pressure action area is greater than the length in the section corresponding to the hip and thigh. In claim 1, the judgment criteria are: Whether the pressure action area is symmetrical left and right in a given section, Whether the highest pressure position exists in a given section, Whether the width of the pressure action area in a given section is greater than the length, and Whether the pressure value is recognized as higher than the reference value in a given section, A method for estimating posture, comprising at least one of: A method for estimating posture according to claim 1, wherein the lying posture is classified into a supine lying posture, a prone lying posture, and a side lying posture. In claim 6, The above posture estimation algorithm is, A posture estimation method for specifying a lying posture by confirming whether the above body pressure characteristics meet the estimation criteria in the estimation section and meet the verification criteria in the verification section. In claim 17, the estimated section includes at least one of a section including a shoulder, a section including a lumbar region, and a section including a hip and a thigh. A posture estimation method, wherein the verification section includes at least one of a section including the buttocks, a section including the buttocks and the thigh, and a section including the calf. In claim 1, the posture estimation algorithm, A posture estimation method that specifies the user's posture as a side-lying posture when the above body pressure characteristics meet the estimation criteria for a side-lying posture in a section including the shoulder and meet the verification criteria for a side-lying posture in a section including the hip. In claim 19, the estimation criterion includes that the pressure action area in the corresponding section is asymmetrical from left to right, The above verification criterion is a posture estimation method including that the highest pressure location exists in the corresponding section. In claim 1, the posture estimation algorithm, A posture estimation method that specifies the user's posture as a supine posture when the above body pressure characteristics meet the estimation criteria of a supine posture in a section including the lumbar spine and meet the first verification criterion in a section including the calf. In claim 21, the estimation criterion includes that, in the relevant section, the pressure value is recognized as being lower than or not recognized as the reference value, The above first verification criterion is a posture estimation method including at least one of the following: that the pressure action area is symmetrical left and right in the relevant section, and that the length of the pressure action area is greater than the width. In claim 22, the posture estimation algorithm, Additionally, if the above body pressure characteristics meet the second verification criterion of the supine posture in the section including the buttocks, the user's posture is specified as the supine posture, The second verification criterion is a posture estimation method including that the highest pressure location exists in the corresponding section. In claim 1, the posture estimation algorithm, A posture estimation method that specifies the user's posture as a supine posture when the above body pressure characteristics meet the estimation criteria for a supine posture in a section including the buttocks and thighs and meet the verification criteria for a supine posture in a section including the buttocks and thighs. In claim 24, the estimation criterion includes that, in the relevant section, the pressure action area is symmetrical left and right and the width of the pressure action area is greater than the length, The above verification criterion is a posture estimation method including that the highest pressure location exists in the corresponding section. In claim 1, the posture estimation algorithm, A posture estimation method that specifies the user's posture as a prone posture when the above body pressure characteristics meet the estimation criteria for a prone posture in a section including the buttocks and thighs and meet the verification criteria for a prone posture in a section including the buttocks. In claim 26, the estimation criterion includes that, in the relevant section, the pressure action area is symmetrical left and right and the length of the pressure action area is greater than the width, The above verification criterion is a posture estimation method including that the highest pressure location does not exist in the corresponding section. A massage mattress in which the posture estimation method of any one of claims 1 to 27 is performed. In claim 28, the mattress: A plurality of pressure sensors arranged in a two-dimensional matrix; An operation control unit that extracts body pressure characteristics from pressure information measured from the pressure sensor and estimates the user's posture; and A massage mattress comprising a massage ceramic that is movable in a direction parallel to the two-dimensional matrix and movable in a direction intersecting the two-dimensional matrix. A massage mattress according to claim 29, wherein the massage ceramic includes a heating function. In claim 30, the operation control unit is a massage mattress that analyzes changes in the user's sleeping behavior from pressure information that changes over time. A massage mattress according to claim 31, wherein the operation control unit performs temperature control in response to the analyzed sleep behavior change. A massage mattress according to claim 29, wherein the operation control unit extracts the user's body information from the pressure information measured by the pressure sensor and identifies the user based on the extracted body information. A massage mattress according to claim 33, wherein the operation control unit recommends a massage mode based on a specific user and a specific user's posture, and automatically sets the position of the massage electrode. In claim 29, the operation control unit, when it is confirmed from pressure information that changes over time that a portion is continuously subjected to a pressure higher than a predetermined value in a predetermined area, moves the massage device to change the body position to prevent bedsores, is a massage mattress.

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