The present invention generally relates to mattresses, and more particularly to a modular multi-zone mattress and related techniques for designing said mattress with an optimized sleep surface of variable deformability.
Some ways of improving the quality of sleep include providing a modular mattress. Modular mattresses can include several modules of mattress material that can be assembled to form a sleep surface.
Existing modular mattresses are designed based on general anthropometric knowledge including known morphotypes, such as ectomorph or mesomorph. These modular mattresses therefore lack flexibility and precision to adapt the sleep surface to one mattress user specifically.
There is thus a need for a modular mattress that overcomes at least some of the drawbacks of what is known in the field.
The techniques described herein relate to the design and assembly of a modular multi-zone mattress having an optimized sleep surface defined by multiple mattress modules. Implementations of the modular multi-zone mattress respond to the above-identified need by providing each mattress module with a deformability and a geometry that are tailored to the individual anthropometry of each mattress user, including at least one of the body weight distribution and a body posture. The resulting sleep surface provides to the mattress user an optimized contact pressure distribution for a given body posture.
The present modular multi-zone mattress comprises a plurality of mattress modules being longitudinally and optionally laterally adjoined to define a sleep surface having a variable deformability, wherein a number of the mattress modules and a deformability of each mattress module are tailored to a unique body shape and weight distribution of a mattress user, thereby providing at least one of an optimized body posture and contact pressure distribution over the sleep surface. The variation in the body posture and in the contact pressure distribution when in contact with the sleep surface can be the result of the combination of several pressure factors of the mattress user and the deformability profile of the sleep surface. The pressure factors include a weight and a morphologic profile of the mattress user. Optionally, the pressure factors can further include a sleep position of the mattress user.
In one aspect, there is provided a modular multi-zone mattress having an optimized sleep surface. The modular multi-zone mattress includes a plurality of mattress modules being adjoined to have a top surface thereof defining the optimized sleep surface. The optimized sleep surface has a variable deformability that provides at least one of an optimized body pressure response distribution and a minimized body posture variation (also referred to as optimized body posture), wherein a number of the mattress modules is selected in accordance with slope variations in a morphological profile of a mattress user, and wherein a deformability of each mattress module is tailored to a body weight distribution of the mattress user, for a given body posture.
In some embodiments, the multiple mattress modules are juxtaposed longitudinally to form the sleep surface. In addition, a length of the top surface of each mattress module can be chosen in accordance with slope variations in a longitudinal morphological profile of the mattress user.
For example, the mattress can include at least three mattress modules for supporting respectively a head portion, an upper body portion and a lower body portion of the mattress user. Alternatively, the mattress can include at least five mattress modules for supporting respectively a head portion, a shoulder portion, a back portion, a bottom portion and a leg portion of the mattress user.
In some embodiments, the number of the mattress modules can be in accordance with a number of inflection points encountered in a curvature of the morphological profile. In addition, the number of mattress modules can be in accordance with a number of slope variations ΔS in the morphological profile having a threshold value.
In some embodiments, the multiple mattress modules comprise at least one end mattress module which dimensions are chosen to meet mattress standard size specifications. For example, the multiple mattress modules can include two end mattress modules.
In some embodiments, each mattress module can be of parallelepipedal shape having the top surface, a bottom surface, two opposed longitudinal sides and two opposed transverse sides. Optionally, at least one mattress module can have the length of the top surface differs from the length of the bottom surface. Further optionally, at least one of the two opposed transverse sides of at least one mattress module can be tapered at an angle from the top surface to the bottom surface. For example, both of the two opposed transverse sides of at least one mattress module can be tapered at an angle from the top surface to the bottom surface. For example, the angle of tapering of one opposed transverse side can be the same or different from the other opposed transverse side. Further optionally, at least one of the two opposed transverse sides of at least one mattress module can be inwardly or outwardly arched from the top surface to the bottom surface.
In some embodiments, the top surface of at least one mattress module can be upwardly or downwardly arched in accordance with the morphological profile of the mattress user in at least one of the longitudinal direction and the transverse direction.
In some embodiments, the mattress can further include a frame structure surrounding the plurality of mattress modules to provide further structural cohesion. The frame structure can include a top layer that extends along the top surface of each mattress module, the top layer having a thickness and material that are selected in accordance with a type of comfort.
In some embodiments, two adjacent mattress modules can be made of a different material.
In some embodiments, the unique body weight distribution is determined based on a morphological profile and a weight of the mattress user. Optionally, the body weight distribution can be determined based on the morphological profile, a weight and a sleep position of the mattress user.
In some embodiments, the given body posture is a natural body posture in accordance with a sleep position of the mattress user.
In another aspect, there is provided a method for designing a modular multi-zone mattress comprising a plurality of adjoined mattress modules defining an optimized sleep surface. The method includes collecting data related to pressure factors of a mattress user, the pressure factors including a weight and a morphological profile of the mattress user; selecting a number of the mattress modules in accordance with slope variations in the morphological profile; selecting a deformability of each one of the mattress modules resulting in a deformability profile of the sleep surface; and determining at least one of a body posture and a contact pressure distribution across the sleep surface based on the deformability profile of the sleep surface and the pressure factors of the mattress user. The steps of selecting the deformability of each one of the mattress modules and determining the at least one of the body posture and the contact pressure distribution are repeated until the at least one of the body posture and the contact pressure distribution is optimized.
In some embodiments, the method can include determining the body posture based on the deformability profile of the sleep surface and the pressure factors of the mattress user for a given contact pressure distribution.
In some embodiments, the method can include determining the contact pressure distribution based on the deformability profile of the sleep surface and the pressure factors of the mattress user for a given body posture.
In some embodiments, the method can include determining both the body posture and the contact pressure distribution based on the deformability profile of the sleep surface and the pressure factors of the mattress user.
Optionally, the body posture can be optimized when a natural body posture is met.
In some embodiments, the contact pressure distribution can be optimized when a gradient in the contact pressure provided by the sleep surface is minimized in both longitudinal and transverse directions.
In some embodiments, selecting the number of the mattress modules can include determining a number of inflection points encountered in a curvature of the morphological profile. Optionally, selecting the number of the mattress modules comprises determining the number of occurrences for which a slope variation ΔS meets a threshold value. Optionally, the method can include selecting a length of a top surface of each mattress module in accordance with the slope variations in a longitudinal morphological profile.
In some embodiments, the mattress modules comprise at least one end mattress module, and the method can further include adjusting a length of the at least one end mattress module to meet mattress standard size specification.
In some embodiments, collecting data related to the pressure factors can include manual measurement of a body shape of the mattress user. Alternatively, collecting data related to the pressure factors can include 3D-scanning of the body of the mattress user. Alternatively, collecting data related to the pressure factors can include determining a total height, an inside leg height, a hip height, an upper and lower waist height, an axilla height, an acromion height, a neck height, and a distance between anatomic landmarks of the body of the mattress user. Optionally, the pressure factors can further include a sleep position.
In some embodiments, selecting the deformability of each one of the mattress modules comprises selecting a material for each mattress module with a given density and mechanical properties. Optionally, the selection of the deformability for each mattress module can be performed among a finite number of available deformabilities.
In some embodiments, each step of the method can be performed via a manual assessment, a numerical analysis, a statistical model or an AI model.
In some embodiments, the method can further include determining an optimisation factor based on the at least one of the body posture and the contact pressure distribution for each repetition, and selecting the deformability profile resulting in the lowest optimisation factor. Optionally, the optimisation factor can be function of a rotation of the body in at least one of a sagittal plane or transverse plane. Further optionally, the optimisation factor is function of a force rendered by at least one mattress module upon being contacted with the mattress user.
The method can further include juxtaposing in a longitudinal direction the mattress modules in accordance with the selected deformability profile so as to produce the optimized sleep surface of the modular multi-zone mattress. Alternatively, the method can further include framing the juxtaposed mattress modules with a base layer, a top layer and side components.
In another aspect, there is provided a use of a numerical model to design a modular multi-zone mattress comprising a plurality of adjoined mattress modules defining a sleep surface. The numerical model is used to perform at least one of a determination of a number and dimensions of the mattress modules based on a morphological profile of a mattress user; a determination of a contact pressure or force distribution over the sleep surface based on the body weight distribution of the mattress user for a given sleep position; a determination of a variation in a body posture over the sleep surface with respect to a natural posture for a given sleep position; and a selection of a deformability of each selected mattress modules to provide at least one of an optimized contact pressure distribution and optimized body posture.
In another aspect, there is provided a use of a finite element numerical model to combine multiple modular mattress zones in accordance with an individual anthropometry of a mattress user, the finite element numerical model approximating the number of modular mattress zones, a shape of each modular mattress zone and a deformability of each modular mattress zone to provide at least one of an optimized contact pressure distribution and optimized body posture over the combined multiple modular mattress zones. In some implementations, the finite element numerical model is used to approximate the deformability of each modular mattress zone among a plurality of given deformabilities. In some implementations, the finite element numerical model is used to approximate the shape of each modular mattress zone among a plurality of given shapes.
While the invention will be described in conjunction with example embodiments, it will be understood that it is not intended to limit the scope of the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included as defined by the present description. The objects, advantages and other features of the present invention will become more apparent and be better understood upon reading of the following non-restrictive description of the invention, given with reference to the accompanying drawings.
Implementations of modular multi-zone mattress and related design techniques are represented in and will be further understood in connection with the following figures.
While the invention is described in conjunction with example embodiments, it will be understood that it is not intended to limit the scope of the invention to these embodiments.
The modular multi-zone mattress proposed herein results from the combination of a plurality of mattress modules defining a sleep surface of variable deformability that is tailored to provide an optimized deformation response to a unique body weight distribution of a mattress user. The modular multi-zone mattress can thus be said to have an optimized sleep surface. The deformability of the modular multi-zone mattress can vary along a longitudinal axis of the mattress and further optionally along a transverse axis of the mattress. Each mattress module is made of a material of given deformability, and the geometric distribution of the mattress modules forming the mattress defines the deformability distribution along longitudinal and transverse axes.
Several factors, referred to as pressure factors, can be taken into account by the techniques described herein to account for the deformation of the sleep surface. These pressure factors include a weight and a morphology of the mattress user. The pressure factors can further include a sleep position of the mattress user. The sleep position is defined by the position adopted by the person when he or she lies on the sleep surface of the mattress, for example on the back (dorsal decubitus) or on the side (lateral decubitus).
The body weight distribution can be understood as a measure of the distribution of the body weight across the surface of the body in contact with the sleep surface. In accordance with the pressure factors, and thus depending on the distribution of the body weight for a given sleep position, pressure points of varying amplitude are applied to the sleep surface and cause deformation of the said sleep surface. The applied body weight distribution results in a contact pressure distribution across the entire sleep surface, for a given deformability profile of the sleep surface. It should be noted that the contact pressure distribution of the sleep surface in response to a given body weight distribution applied by the mattress user is considered herein as optimized when high-pressure points have a minimized amplitude and surface, when the contact pressure (related to the normal force) that is provided by the deformed sleep surface to the body surface is uniform (in longitudinal direction alone or in both longitudinal and transverse direction), when a gradient in the contact pressure provided by the deformed sleep surface is minimized, when local shear stress is minimized, when the area of the sleep surface that is in contact with the mattress user is maximized, or a combination thereof.
The deformability of the sleep surface can lead to a variation in the body posture. Certain variations in the body posture can provide an uncomfortable feeling to a mattress user. For example, a rotation of the body in the traverse plane will create more pressure in the left or right side while in the longitudinal plane, such that a section of the body would be placed deeper in the mattress than it should be. Multiple other variations in the body posture are encompassed herein, such as a change in the curvature of the spine or any modification of the positioning of a body part with respect to a plane or axis determining the natural posture.
The present modular mattress and related method of design provides a sleep surface that can be tailored to minimize the variation in the body posture with respect to a natural body posture resulting from the sleep position of the mattress user. For example, minimization of the variation in the body posture can be understood as minimizing the rotation of the body in the transverse plan and sagittal plan (see
An optimized sleep surface as encompassed herein is to be understood as a sleep surface offering at least one of an optimized contact pressure distribution and a minimized body posture variation (also referred to as optimized body posture). Such optimized sleep surface can be considered as a “comfortable” sleep surface for a mattress user.
The techniques described herein include determination of the body weight distribution over the sleep surface based on a unique combination of pressure factors for each mattress user. The number of the mattress modules, dimensions of each mattress module and deformability of each mattress module can then be tailored to provide an optimized deformation response to the determined body weight distribution for a given body posture.
Referring to
The longitudinal morphological profile as used herein can be defined by a longitudinal curvature of varying slope of the body surface that is in contact with the mattress (from head to toe). The transverse morphological profile as used herein can be defined by a medio-lateral curvature of the body surface that is in contact with the mattress. The morphological profile as used herein refers at least to the longitudinal curvature, and further optionally to the medio-lateral curvature, of the body surface that is in contact with the mattress. Each change in slope along the longitudinal morphological profile can translate in a change in a body pressure applied to the sleep surface of the mattress.
In some implementations, the number of mattress modules can be selected according to the slope variations of the morphological profile of each mattress user. For example, the modular multi-zone mattress can include at least three mattress modules having a top surface for supporting a head portion, an upper body portion and a lower body portion of the mattress user. In another example, referring to
It is noted that the number of mattress modules forming the sleep surface of the modular multi-zone mattress includes two end mattress modules located at longitudinal extremities of the mattress and at least one internal mattress module located between the two end mattress modules. For example, in
Referring to
For a given mattress dimensions, the size and shape of each mattress module can be determined in accordance with the number of mattress modules. Referring to
As seen in
Optionally, the top surface of the mattress module can include curved portions that are adapted to further optimize the deformation response to the body weight distribution, for a given morphological profile of the mattress user. A first and end mattress module supporting a head portion of the mattress user can for example have a convex top surface to serve as a pillow. Further optionally, the mattress can then include a top layer having a bottom surface being curved complementarily to the top surface of the mattress modules.
When referring to variable dimensions (also referred to as size and shape) of each mattress module, one should understand that at least the top length L1 is optimized in accordance with the morphological profile of the mattress user. For example, in addition to the top length L1, the shape of the top surface can differ from a rectangle and can include curves, as seen in
Referring to
Tapering the internal transverse sides of the mattress modules allows for a gradual transition in deformability from the top surface of one mattress module to the top surface of the adjacent mattress module. The bottom length L2 and the angles (α1 and α2) defined by the transverse sides of the mattress module can be further optimized in accordance with a difference in deformability between two adjacent mattress modules. For example, the bigger the difference in deformability is between a first mattress module and a second adjacent mattress module, the more tapered the facing transverse sides of the first and second mattress can be. The angles are further limited by the resulting bottom length L2 of the mattress modules, so as to accommodate a given total length of the mattress.
It is noted that the width W of each mattress module is to be chosen in accordance with a width of the overall mattress and can be generally the same for all the mattress modules forming the mattress. It is noted that the width W of the mattress modules can further be chosen based on standard single bed dimensions. It is further noted that the height H of each mattress module can be generally the same for all the mattress modules forming the mattress so as to adapt to standard mattress thicknesses. It should further be noted that the height of the mattress module can account for the presence of a top layer and a base layer to match standard mattress thicknesses. Alternatively, the height of each mattress module can also be a parameter that can vary to optimize the deformation response to the body weight distribution of the mattress user.
Deformability is defined by the nature, the density, and the mechanical properties of the building material of the mattress module. Any known building material in the field of mattresses can be used to provide a desired deformability to each mattress module, and can include polyurethane foam (e.g., with density varying from 1.5 PCF (Pounds per Cubic Feet) to 5 PCF), viscoelastic foam or memory foam (e.g., with density varying from 2.5 PCF to 6 PCF) and latex (e.g., with density varying from 3 PCF to 6 PCF). It is noted that several mattress modules of the modular multi-zone mattress, whether they are juxtaposed or not, can be made of a same material or of a material having substantially the same density and/or mechanical properties.
Each mattress user is characterized by a unique combination of weight and morphology defining ergonomic needs that cannot be fully matched by a sleep surface designed based on general anthropometry only. The present modular multi-zone mattress is configured to take into account the weight and the morphology of each mattress user. Optionally, in addition to weight and morphology, sleep position of the mattress user (including supine position, prone position and lateral position) can be considered as another pressure factor impacting the general distribution of body weight applied to the sleep surface, and a depth of each of these pressure points.
The techniques described herein include collecting data related to the morphological profile of the mattress user and selecting a number of mattress modules in accordance with slope variations in the morphological profile for a given sleep position. Once the number of mattress modules is determined, the deformability of each mattress module can be selected in accordance with the body weight distribution for a given mattress user so as to create the optimized sleep surface as defined herein. Thus, each mattress module has a deformability tailored to a specific body pressure range imposed by the mattress user. For example, the selection of deformability for each mattress module can be performed to provide an overall sleep surface having an enhanced contact pressure profile (compared to a mattress of unique deformability and lacking the modular configuration).
Referring to
Still referring to
The selection of the number and dimensions of the mattress modules can be performed in various ways including visual analysis or numerical analysis. For example, referring to
The method can include selecting a length of the last end mattress module in accordance with a desired length of the sleep surface of the mattress. The length of the last end mattress can simply be obtained by subtracting the length of the remaining mattress modules to a total desired length.
Still referring to
The selection of the deformability of each one of the mattress modules to provide at least one of the optimized contact pressure distribution and the optimized body posture can be performed in various ways, including manual assessment and numerical analysis.
For example, the numerical analysis can be the result of an analytical, statistical or finite element model. Each of these numerical models can be used to associate the weight of the mattress user to the corresponding morphological profile to determine a body weight distribution of the body surface in contact with the sleep surface of the mattress, and then to generate the contact pressure distribution over the sleep surface for a given combination of mattress modules. The numerical model can be further used to select a deformability for each of the determined number of mattress modules so as to form a sleep surface having a varying deformability profile that provides an optimized contact pressure distribution. For example, the resulting sleep surface has a varying deformability profile that is selected to produce a surface pressure response of enhanced uniformity when the body weight distribution of the mattress user is applied thereto.
The selection of the deformability can include selecting a density of the building material of the mattress module. It is noted that the selection of the deformability for each mattress module can be performed among a finite number of available deformabilities. For example, the numerical model is run as a loop that will end when a combination of selected deformabilities for the mattress modules satisfies a given uniformity criterion or optimisation factor corresponding to the pressure response of the sleep surface (optimized contact pressure distribution), the optimized body posture, or both. More particularly, the numerical model can be given densities of available building material and the selection of the deformability can include selecting a building material of given density. Additional mechanical properties of the building material, such as Young modulus, Poison ratio, bulk modulus, shear modulus, viscoelastic parameters, stress-strain curves, or a combination thereof can be used as input data of the numerical model to assist in the selection of an optimized deformability profile.
In some implementations, the selection of the deformability profile for a given body weight distribution can be performed based on a numerical model including the use of a mathematical expression that evaluates the performance of different combinations of mattress modules of given deformability based on an optimisation factor taking into account at least one of the maximal force provided by a mattress module (e.g., shoulder module) and the variation of the body posture (e.g., rotation). The numerical model compares the performance of one mattress with respect to multiple other mattresses, and selects the mattress having the smallest optimization factor (best performance). For example, in below Equation (1), each mattress (i) is compared to the other n mattresses using a normalized function taking into account the normalized maximal forces of three different mattress modules (shoulder module, lumbar module and pelvic module). The smallest resulting optimization factor will correspond to the modular mattress having the lowest maximal forces at the shoulder and pelvis module, and the highest maximal force at the lumbar module (as lumbar curve is not always in contact with the sleep surface). Imposing the highest force at the lumbar module allows to maximize the contact of the sleep surface with the lumbar region of the body, such that the contact pressure distribution is optimized.
The numerical model can be adapted to evaluate the sleep surface based on another criteria, that is the minimization of the variation in the body posture with respect to the natural body posture given by the sleep position. For example, in below Equation (2), each mattress (i) is compared to the other n mattresses using a normalized function taking into account the rotation energy of the chest in the sagittal plane. The smallest resulting optimization factor will correspond to the modular mattress having the smallest rotation energy (optimized body posture).
The numerical model can be further adapted to evaluate the sleep surface based on all of the above criteria. For example, in below Equation (3), each mattress (i) is compared to the other n mattresses using a normalized function taking into account the rotation energy of the body, and the normalized forces of three different mattress modules (shoulder module, lumbar module and pelvic module). The smallest resulting optimization factor will correspond to the modular mattress having the smallest rotation energy (optimized body posture), the lowest forces at the shoulder and pelvis module, and the highest force at the lumbar module (as lumbar curve is not always in contact with the sleep surface).
It should be noted that a same numerical model having the weight and morphological profile as input data can be established to perform determination of the number and dimensions of the mattress modules based on the morphological profile, determination of the at least one of the contact pressure distribution and the body posture based on the weight and the morphological profile, and selection of the deformability of each selected mattress modules to provide an optimized sleep surface.
Other ways to select the deformability of each one of the mattress modules and provide an optimized sleep surface can include the use of a statistical model that uses the morphology of a given mattress user and compares it to a data bank of combinations of mattress modules for known mattress users to generate a combination of mattress modules (number, dimensions and deformability) that is tailored to the given mattress user. The data bank includes information related to the weight, morphology and related modular multi-zone mattress for past mattress users. Another possibility to build the optimized modular mattress for a specific morphology is to use a trained artificial intelligence (AI) model. The AI model can be trained to determine, based on existing association of morphologies and mattress module deformabilities, the best material for a given morphology and weight. The AI model can be periodically or continuously retrained as new morphologies and material characteristics are added to the databases.
It should however be noted that selection of the deformability for each mattress module can be performed manually. For example, one could combine the determined number of mattress modules with given deformability and assess at least one of the contact pressure distribution and the body posture when the mattress user is in a given sleep position. If the contact pressure distribution or the body posture is not considered as optimized (large gaps between body and sleep surfaces or pressure points felt by the mattress user, excessive rotations), the number and/or material of the mattress modules could be varied until a satisfactory and optimized sleep surface is found.
It should further be noted that certain steps of the method described herein can be performed manually while other can be performed with the assistance of a numerical analysis, a statistical model or an AI model. For example, selection of the deformability of the mattress modules can be performed manually while the determining of at least one of the resulting body posture and contact pressure distribution can be performed via numerical simulation.
Referring to
It should be noted that the method can include performing the steps as defined above for more than one mattress user, e.g., two mattress users, and combine the selected mattress modules so as to form a two-people modular multi-zone mattress having two different optimized sleep surfaces distributed transversally.
It should be noted that the same numerical references refer to similar elements. Furthermore, for the sake of simplicity and clarity, namely so as to not unduly burden the figures with several references numbers, not all figures contain references to all the components and features, and references to some components and features may be found in only one figure, and components and features of the present disclosure which are illustrated in other figures can be easily inferred therefrom. The embodiments, geometrical configurations, materials mentioned and/or dimensions shown in the figures are optional, and are given for exemplification purposes only. Therefore, the descriptions, examples, methods and materials presented in the claims and the specification are not to be construed as limiting but rather as illustrative only.
Although the implementations of the modular multi-zone mattress and corresponding parts thereof consist of certain geometrical configurations as explained and illustrated herein, not all of these components and geometries are essential and thus should not be taken in their restrictive sense. Moreover, it will be appreciated that positional descriptions such as “above”, “below”, “first”, “last” and the like should, unless otherwise indicated, be taken in the context of the figures and should not be considered limiting.
In the above description, an implementation or embodiment is an example of the invention. The various appearances of “one embodiment,” “an embodiment” or “some embodiments”, “an implementation”, “some implementations” do not necessarily all refer to the same example. Although various features of the invention may be described in the context of a single implementation, the features may also be provided separately or in any suitable combination. Conversely, although the invention may be described herein in the context of separate implementations for clarity, the invention may also be implemented in a single implementation.
It should be understood that any one of the above-mentioned optional aspects of each the mattress, designing method and use of a model to design the mattress may be combined with any other of the aspects thereof, unless two aspects clearly cannot be combined due to their mutual exclusivity. For example, the various operational steps of the method described herein-above, herein-below and/or in the appended Figures, may be combined with any description of the structural elements of the mattress appearing herein and/or in accordance with the appended claims.
Two examples of stress distribution (corresponding to the contact pressure distribution at the interface between the sleeper and the top surface of the mattress) for 3 different mattresses for two mattress users are provided below.
Two mattress users with different morphological body shape (profile) and weight were studied. The morphological body shape of each mattress user was obtained with a 3D scanner, while the weight was obtained with a scale. The corresponding front and side views of the collected morphological body shape of a male mattress user and a female mattress user are seen in
Referring to
Each letter represents a specific material for the mattress module. In this example, mattresses 1 and 2 are composed of the same materials for both mattress users. Mattress 3A differs from mattress 3B in terms of module dimensions and materials for each mattress user.
Body Support
Referring to
Optimized Contact Pressure Distribution
Minimized Variation in the Body Posture
Filing Document | Filing Date | Country | Kind |
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PCT/CA2021/051468 | 10/19/2021 | WO |
Number | Date | Country | |
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63093403 | Oct 2020 | US |