Device comprising a flexible sheet having a hollow chamber

Abstract

The present invention provides a device, comprising a flexible sheet having a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, and an opening for conveying fluid between the outside of the flexible sheet and the hollow chamber; a fluid source, which is configured to supply fluid to the hollow chamber via the opening to cause at least one of the surface area or volume of the flexible sheet in the local area to increase; and a control circuit for controlling the fluid source; wherein the control circuit is configured to determine a control operation by identifying the user's movement category and / or predicting a required change in pressure in the hollow chamber; and the control circuit is configured to perform the control operation by controlling the supply of fluid flowing into or out of the hollow chamber.

Description

Technical Field

[0001] The present invention relates to a device comprising a flexible sheet. The present invention also relates to a device comprising a liner. The present invention also relates to a method of fitting a liner to a body part. The present invention also relates to the use of a flexible sheet as an interface. The present invention also relates to a method of forming a flexible sheet. Background Art

[0002] At the interface between two rigid surfaces, the contact of the rigid surfaces can induce a resultant stress on a specific area of ​​the rigid surfaces. This problem can be exacerbated when there is a significant mismatch between the shapes of the rigid surfaces. In some cases, one or more rigid surfaces can be designed to have shapes that correspond to each other.

[0003] Another possible solution is to provide a soft interface material having a shape that substantially fills the space between two rigid surfaces. However, these solutions are ineffective when the size and / or shape of one or more rigid surfaces changes over time. In this case, the soft interface material and one or more rigid surfaces may be subject to increased pressure. Alternatively, a spatial gap may appear between the rigid surface and / or the soft interface material, which may result in a poor fit between the surfaces. To avoid these problems, it may be necessary to replace the soft interface material periodically, which may be undesirable and impractical if the size and / or shape of one or more surfaces changes frequently.

[0004] One exemplary area facing such problems is the field of prosthetics. In particular, amputees may find that the prosthesis does not maintain a fit to the residual limb due to changes in the size and / or shape of the residual limb. After surgery, the residual limb may swell due to post-operative edema. The edema may last for 12-18 months, and amputees need to wear the first prosthesis within 3-4 weeks after surgery in order to start physical therapy. It is undesirable to extend the time between surgery and physical therapy because it will lead to increased muscle loss. If the shape of the prosthetic socket is set to fit the shape of the amputee's limb within 3-4 weeks after surgery, the prosthetic socket will not maintain a fit to the residual limb due to subsequent changes in the size and / or shape of the residual limb. In this case, the pressure may be unevenly distributed on the residual limb, which may cause skin problems for the amputee. Uneven pressure, shear / tensile forces and sweat can damage the tissue of the residual limb, leading to inflammation, ulcers and infection.

[0005] Currently, there are partial solutions that can accommodate minor changes in limb shape and / or size. A prosthetic liner comprising a rubber U-shaped sleeve can be mounted to the limb and a cotton sock worn between the prosthetic liner and the prosthetic socket. Varying the thickness of the cotton sock used can accommodate minor changes in limb size and / or shape. However, these cotton socks can cause excessive sweating of the limb, especially when multiple layers of socks are combined together. When the limb becomes wet, the friction between the liner and the residual limb is reduced, which can result in a reduction in the suspension of the residual limb to the prosthesis and liner. This loss of suspension is important because the prosthesis may rely on this suspension to remain attached to the residual limb. Moreover, using cotton socks of varying thickness does not mitigate changes in surface geometry, which is a key factor in pressure distribution.

[0006] Currently, the only solution option for large fluctuations in limb shape and / or size is to replace the socket, which can be time-consuming and expensive. In addition, during the time it takes to make a new, properly fitting socket, the amputee may have to go out without the prosthesis, which can affect the amputee's standard of living and delay recovery. Even if a new socket is made, it may not fit when it arrives because the size and / or shape of the limb may have changed again during the period required to make the new socket.

[0007] Based on the foregoing, there exists a need to provide an improved flexible interface between rigid surfaces that can accommodate differences in size and / or shape. Summary of the invention

[0008] Aspects and features of the invention are defined in the appended claims.

[0009] According to a first aspect of the present invention, there is provided a device comprising: a flexible sheet having a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, and an opening for conveying fluid between the outside of the flexible sheet and the hollow chamber; a fluid source configured to supply fluid to the hollow chamber via the opening to cause at least one of the surface area or volume of the flexible sheet in the local area to increase; and a control circuit for controlling the fluid source; wherein the control circuit is configured to determine a control operation by identifying a user's movement category and / or predicting a required change in pressure in the hollow chamber; and the control circuit is configured to perform the control operation by controlling the supply of fluid flowing into or out of the hollow chamber, optionally with the aid of a valve.

[0010] Optionally, the control circuit comprises at least one electronic sensor.

[0011] Optionally, the control circuit is configured to determine the control operation based on feedback from the at least one sensor.

[0012] Optionally, the control circuit is configured to identify the motion category by matching the feedback with a specific periodic pattern indicative of the motion category to determine the control action.

[0013] Optionally, the control circuitry is configured to determine the control action by predicting the required change by matching the feedback to a particular characteristic pattern or sequence indicative of the required change based on past control actions.

[0014] Optionally, the control circuit is configured to record feedback from the at least one sensor and / or past control operations, and analyze the recorded feedback to determine a periodic pattern indicative of a movement category and / or a characteristic pattern or sequence of control.

[0015] Optionally, the device is configured to transmit recorded feedback from the at least one sensor and / or past control operations to a remote device and receive data related to periodic patterns indicative of movement categories and / or characteristic patterns or sequences of control.

[0016] Optionally, the control circuit is configured to perform the determined control operation in response to user input.

[0017] Optionally, the control circuit is configured to automatically perform the determined control operation.

[0018] Optionally, a plurality of fluid sources are configured to supply fluid to one or more of said openings in said flexible sheet.

[0019] Optionally, the fluid is a gas.

[0020] Optionally, the fluid source is a compressed fluid source, such as a compressed fluid tank.

[0021] Optionally, the source of compressed fluid is replaceable or refillable.

[0022] Optionally, the control circuit is configured to control the supply of fluid into the hollow chamber by releasing gas from the compressed fluid source into the hollow chamber and / or to control the supply of fluid out of the hollow chamber by releasing gas to the outside of the hollow chamber and optionally to the outside of the device.

[0023] According to a second aspect of the present invention, there is provided an apparatus comprising: a sheet having a hollow chamber arranged within the thickness of the sheet and an opening for conveying a fluid between the outside of the sheet and the hollow chamber; a fluid source configured to supply fluid to the hollow chamber via the opening; and a control circuit for controlling the fluid source; characterized in that the fluid source is a compressed fluid source.

[0024] Optionally, the sheet material is a flexible sheet, the hollow chamber is arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, and the fluid source is configured to supply fluid to the hollow chamber via the opening to cause at least one of the surface area or volume of the flexible sheet in the local area to increase.

[0025] Optionally, the control circuit is configured to control the fluid source to provide a cooling effect in the flexible sheet.

[0026] Optionally, the device of the first aspect or the second aspect is one of the following: a mattress, a wheelchair, a prosthesis, a helmet, a ski boot, a shoe sole, or a medical or non-medical device for contacting the skin.

[0027] According to a third aspect of the present invention, a system is provided, which includes a device of the first aspect, which is configured to transmit recorded feedback from the at least one sensor and / or past control operations to a remote device, and receive data related to a characteristic pattern or sequence of periodic patterns and / or controls indicating a motion category, and the system further includes a remote device remote from the device, wherein the remote device is configured to analyze the recorded feedback from the at least one sensor and / or past control operations to determine a characteristic pattern or sequence of periodic patterns and / or controls indicating a motion category, and send data about the characteristic pattern or sequence of periodic patterns and / or controls indicating a motion category to the device.

[0028] According to a fourth aspect of the present invention, there is provided a method for controlling the expansion of a flexible sheet, the flexible sheet having a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, and an opening for conveying fluid between the outside of the flexible sheet and the hollow chamber, the method comprising: identifying a user's movement category and / or predicting a required change in pressure in the hollow chamber; determining a control operation based on the identified movement category or the predicted required change in pressure in the hollow chamber; and performing the control operation by controlling the supply of fluid flowing into or out of the hollow chamber.

[0029] Optionally, the method further comprises identifying the motion class by matching sensor feedback with a particular periodic pattern indicative of the motion class, thereby determining the control action.

[0030] Optionally, the method further comprises determining the control action by predicting the desired change by matching sensor feedback to a particular characteristic pattern or sequence indicative of the desired change based on past control actions.

[0031] Optionally, the method further comprises recording information regarding sensor feedback associated with the flexible sheet and past control operations of the flexible sheet; and analyzing the recorded information to determine a periodic pattern indicative of a category of motion and / or a characteristic pattern or sequence of control.

[0032] Optionally, the steps of identifying and determining are based on characteristic patterns or sequences indicative of periodic patterns and / or control of the movement category.

[0033] According to a fifth aspect of the present invention, there is provided a computer program comprising codes, which, when executed by a computer system, instruct the computer system to implement any variant of the method of the fourth aspect.

[0034] According to a sixth aspect of the present invention, there is provided a computer system for controlling the expansion of a flexible sheet, the system comprising at least one processor and a memory storing codes which when executed implement any variation of the method of the fourth aspect.

[0035] A liner is also disclosed, comprising: a flexible sheet having an annular cross-section along at least a portion of the longitudinal axis of the flexible sheet; a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet; and an opening for conveying fluid between the outside of the flexible sheet and the hollow chamber, wherein the conveying of the fluid to the hollow chamber causes at least one of the surface area or volume of the flexible sheet in the local area to increase.

[0036] Optionally, the longitudinal axis of the flexible sheet extends between a proximal end and a distal end of the flexible sheet, and wherein the opening is located at one of the proximal end, the distal end or an outer surface of the flexible sheet.

[0037] Optionally, the flexible sheet has a parabolic cross-section, such that the proximal end is open and the distal end is closed. Alternatively, the flexible sheet can be optionally a flat sheet that can be wrapped around an object or body part (similar to a cuff for monitoring blood pressure). In this case, the sheet is wrapped to form a geometric shape having a circular cross-section and optionally a parabolic longitudinal section.

[0038] Optionally, the transfer of the fluid between the flexible sheet and the hollow chamber is caused by control of a fluid source.

[0039] Optionally, the transporting of the fluid out of the hollow chamber causes at least one of a surface area or a volume of the flexible sheet in the localized region to decrease.

[0040] Optionally, the liner includes a plurality of hollow chambers in respective localized regions of the flexible sheet.

[0041] Optionally, the plurality of hollow chambers are interconnected via at least one embedded tube such that fluid can be transported between the plurality of hollow chambers.

[0042] Optionally, the different transport of the fluid between the exterior of the flexible sheet and each of the plurality of hollow chambers results in a different increase and / or decrease in at least one of the surface area or volume of the flexible sheet at each local region.

[0043] Optionally, in use, the liner is disposed between the rigid object and the rigid socket.

[0044] Optionally, delivery of the fluid into the hollow chamber causes increased friction between the flexible sheet and the body part.

[0045] Optionally, the liner is used to cushion the rigid object at an interface with at least one of a prosthetic device, a ski boot, or a shoe lining.

[0046] Optionally, the flexible sheet is capable of maintaining contact with a human limb during use.

[0047] Optionally, the increase in at least one of the surface area or volume occurs at at least one of the inner surface or the outer surface of the flexible sheet.

[0048] Optionally, the flexible sheet comprises a polymer.

[0049] Also disclosed is a device including the above-mentioned liner, the device comprising: a fluid source, which is configured to supply fluid to the hollow chamber via an opening to cause at least one of the surface area or volume of the flexible sheet in a local area to increase; and a control circuit for controlling the fluid source.

[0050] Optionally, the control circuit comprises an electronic sensor and control logic for controlling the fluid source.

[0051] Optionally, the control circuit is configured to control the fluid source based on feedback from a sensor.

[0052] Optionally, the control circuit is configured to control the fluid source based on user input.

[0053] Optionally, the control circuit is configured to identify at least one of a user's motion category or a change in pressure pattern and control the fluid source based at least in part on at least one of the identified motion category or the change in pressure pattern.

[0054] Optionally, a plurality of fluid sources are configured to supply fluid to one or more of said openings in said flexible sheet.

[0055] Also disclosed is a method for fitting a liner to a body part, the liner comprising a flexible sheet having an annular cross-section along at least a portion of a longitudinal axis of the flexible sheet and having a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, the method comprising: inserting the body part into the interior of the liner; controlling a fluid source using a control circuit; supplying a fluid to the hollow chamber via an opening in the flexible sheet and using the fluid source to cause at least one of a surface area or a volume of the flexible sheet in the local area to increase.

[0056] Optionally, the method comprises controlling the fluid source using the control circuit based on feedback from a sensor.

[0057] Optionally, the method comprises controlling the fluid source based on input from a user using the control circuit.

[0058] Optionally, the method comprises controlling the fluid source using the control circuit based on input from a mobile device.

[0059] Optionally, the method comprises controlling actuation of a plurality of fluid sources to supply the fluid to a plurality of hollow chambers of the flexible sheet.

[0060] Optionally, the method comprises selectively supplying different amounts of fluid to different hollow chambers of the plurality of hollow chambers using respective ones of the plurality of fluid sources.

[0061] Also disclosed is the use of a flexible sheet as an interface between an object and a rigid surface, the flexible sheet comprising a hollow chamber arranged within the thickness of the flexible sheet at a local area of ​​the flexible sheet, and an opening for conveying a fluid between the outside of the flexible sheet and the hollow chamber, wherein the fluid is conveyed to the hollow chamber to cause at least one of the surface area or volume of the flexible sheet in the local area to increase, and wherein: the object is arranged to contact the surface of the flexible sheet; the flexible sheet is arranged to contact the rigid surface; a fluid source supplies the fluid to the hollow chamber through the opening to cause the flexible sheet to increase its support for the object and / or to adapt to the contour of the object.

[0062] Optionally, the flexible sheet is configured to change shape and / or volume in response to the fluid source supplying the fluid to the hollow chamber to cause cushioning of the object.

[0063] Optionally, actuation of the plurality of fluid sources supplies said fluids to the plurality of hollow chambers via at least one embedded tube and at least one valve.

[0064] Optionally, the shape and / or volume of the flexible sheet is changed by selectively actuating different ones of the plurality of fluid sources.

[0065] Optionally, the selective braking of different fluid sources among the multiple fluid sources includes: actuating a first fluid source to supply a first amount of fluid to a first hollow chamber; and actuating a second fluid source to supply a second amount of fluid to a second hollow chamber, wherein the first amount of fluid is greater than the second amount of fluid.

[0066] Optionally, the selective braking of different fluid sources among the multiple fluid sources includes: actuating a first fluid source to supply a first amount of fluid to a first hollow chamber; and actuating a second fluid source to supply a second amount of fluid to a second hollow chamber, wherein the first amount of fluid is equal to the second amount of fluid.

[0067] Optionally, the object is a body part.

[0068] Optionally, the use of the flexible sheet includes at least one of a mattress, a wheelchair, a prosthesis, a helmet, a ski boot, a shoe sole, or a medical or non-medical device configured to contact the skin.

[0069] A method for forming a flexible sheet is also disclosed, the method comprising: curing a molding material to form a cured polymer including a hollow chamber and an embedded tube; setting the cured polymer on an inner mold; adding uncured molding material to an outer mold; inserting the inner mold into the outer mold so that the uncured molding material is in contact with the cured polymer; curing the uncured molding material in contact with the cured polymer to form the flexible sheet; and removing the inner mold and the outer mold from the flexible sheet.

[0070] Optionally, the solidified polymer comprises a plurality of hollow chambers and a plurality of embedded tubes.

[0071] Optionally, the solidified polymer is arranged to enable fluid to be transmitted between interconnected hollow chambers of the plurality of hollow chambers via each embedded tube of the plurality of embedded tubes.

[0072] Optionally, the solidified polymer comprises an opening for transferring fluid between a fluid source and the hollow chamber.

[0073] Optionally, pieces of cured polymer are disposed on the inner mold.

[0074] Optionally, the shapes of the inner mold and the outer mold enable the flexible sheet to form a dome shape with one end closed.

[0075] Optionally, the uncured moulding material comprises a polymer, and wherein the step of inserting the inner mould into the outer mould so as to bring the uncured moulding material into contact with the cured polymer comprises bringing the cured polymer into contact with the uncured polymer. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0077] Figure 1 An example flexible sheet is shown.

[0078] Figure 2 A cross-sectional view of an example flexible sheet is shown.

[0079] Figure 3 A 3-D view of an example flexible sheet is shown.

[0080] Figure 4 A cross-sectional view of an example flexible sheet is shown with fluid supplied to a flexible chamber.

[0081] Figure 5 A 3-D view of an example flexible sheet is shown with fluid supplied to the flexible chamber.

[0082] Figure 6 A method for fitting a liner to a body part is shown.

[0083] Figure 7 A method of forming a flexible sheet is shown;

[0084] In the drawings, like elements are always denoted by like reference numerals. DETAILED DESCRIPTION

[0085] As discussed in the background section, changes in the size and / or shape of one or more rigid surfaces can result in geometric mismatches between the surfaces. This can result in increased pressure at specific points on one or more surfaces and / or poor fit between the surfaces. Providing a soft interface between rigid surfaces is ineffective when the size of one or both surfaces varies greatly and when the shape of one or both surfaces varies. Therefore, it is desirable to provide an interface for being arranged between rigid surfaces that can accommodate changes in size and / or shape.

[0086] As used herein, rigidity can be used to refer to resistance to deformation. Rigidity should not be interpreted as a surface or object that does not deform or yield at all. Rigidity can be interpreted as referring to a greater resistance to deformation than a flexible sheet.

[0087] Objects and surfaces referred to herein refer to elements that can be arranged to contact a flexible sheet. In some examples, the object or surface can be a mechanical element, a structural element, or a medical element. In other examples, the object or surface can be a body part and / or a prosthetic device. The object or surface can be a medical or non-medical device that is configured to contact the skin. When discussing the disclosed examples, the terms "object" and "surface" can be used interchangeably.

[0088] In the following, an example of a flexible sheet is given. It will be understood that the present disclosure is not limited to this particular example, but different geometries of the flexible sheet are within the scope of the present disclosure. The flexible sheet can be any shape suitable for use as an interface between rigid surfaces, including parabolic, annular, planar, or a combination of some or all of these geometries.

[0089] Hereinafter, it will be further understood that the disclosed flexible sheet is not limited to use as a liner between a body part and a prosthesis, but is suitable for use as an interface between any suitable objects. In some non-limiting examples, the flexible sheet can be used to provide cushioning in ski boots, wheelchairs, mattresses or helmets.

[0090] Go to Figure 1 , an example of a flexible sheet 10 is disclosed. The longitudinal axis of the flexible sheet 10 may extend from a proximal end 12 of the flexible sheet 10 to a distal end 14 of the flexible sheet 10. The flexible sheet 10 has a circular cross-section along at least a portion of the longitudinal axis of the flexible sheet 10, particularly, for example, a liner for a prosthesis. However, although this is the manner in which it is illustrated herein, as discussed later, it may be more widely used for other purposes where the geometry may differ from that described above. Figure 1 In the example shown, the distal end 14 of the flexible sheet is closed to form a parabolic or dome-shaped flexible sheet 10. However, in some examples, the distal end 14 can be open so that the flexible sheet 10 has an annular cross-section along its entire longitudinal range. In some examples, the diameter of the area surrounded by the flexible sheet 10 can vary along the longitudinal range of the flexible sheet. As described above, in some examples, the flexible sheet 10 can be planar (flat). In these examples, the flexible sheet 10 can support a load placed thereon, such as for a mattress, a sole, or a wheelchair.

[0091] The flexible sheet 10 is suitable for use as a liner. In other words, the flexible sheet can be disposed adjacent to or between one or more rigid surfaces to provide support and / or cushioning. The flexible sheet 10 can be composed of or include a polymer such as an elastomer. This allows the flexible sheet to remain in contact with the rigid surface when subjected to a force acting to separate the flexible sheet from the rigid surface. In these examples, the rigid surface can be inserted into an area surrounded by the flexible sheet 10 from one or more sides.

[0092] The flexible sheet 10 includes at least one opening 16. Fluid can pass between the outside of the flexible sheet 10 and the inside of the flexible sheet 10 via the opening 16. Figure 1 In the example shown, the flexible sheet 10 has four openings. However, it should be understood that the flexible sheet 10 may include one, two, three, or any other suitable number of openings.

[0093] exist Figure 1 In the example shown, the opening of the flexible sheet 10 is provided at the proximal end 12 of the flexible sheet 10. However, it will be appreciated that the opening may be provided at the distal end of the flexible sheet 10 or on the outer or inner surface of the flexible sheet 10, or any combination of these locations.

[0094] Figure 2 1 shows a cross-sectional view of the flexible sheet 10. In other words, Figure 2 A slice of the flexible sheet 10 taken along its longitudinal axis is shown. The flexible sheet 10 includes at least one hollow chamber 18. The hollow chamber 18 is disposed within the thickness of the flexible sheet 10. The hollow chamber 18 is located in a localized area of ​​the flexible sheet 10. In other words, the hollow chamber 18 does not completely occupy all or substantially all of the interior of the flexible sheet 10.

[0095] In some examples, the flexible sheet 10 may include multiple hollow chambers 18. If there is more than one hollow chamber 18, one or more of the hollow chambers 18 may be connected to one or more other hollow chambers 18 by an embedded tube 20. The embedded tube 20 may additionally or alternatively connect the hollow chamber 18 to the opening 16. Figure 2 In the example shown, a series of six interconnected hollow chambers 18 are linked by a corresponding series of embedded tubes 20. The hollow chamber 18 closest to the proximal end 12 of the flexible sheet 10 is connected to the opening 16 via the uppermost embedded tube 20. The opening 16 connects the uppermost embedded tube 20 to the outside of the flexible sheet 10.

[0096] exist Figure 2 In the example shown, twelve hollow chambers 18 can be seen presented as two separate series, each series having six interconnected hollow chambers 18. However, any number of series of interconnected hollow chambers 18 may be used, as may any number of interconnected hollow chambers 18 per series. In some examples, a single series of interconnected hollow chambers 18 may be used. In other examples, three, four, or any other suitable number of series of interconnected hollow chambers 18 may be used.

[0097] In the case of multiple series of interconnected hollow chambers 18, each series can be separated at a constant angle around the periphery of the flexible sheet 10. The use of a constant angle can provide an appropriate distribution of support and cushioning around the entirety and corresponding surfaces of the flexible sheet 10. In other examples, the multiple series of interconnected hollow chambers 18 can be separated at different angles. In certain areas where there are specific protrusions or pressure points and / or where a high density of hollow chambers 18 is required, it may be useful to use the above-mentioned different separation angles. These areas may correspond to areas where the shape and / or size of the rigid surface is expected to vary more than other areas.

[0098] In other examples, the hollow chambers 18 may not be distributed in an interconnected series extending along the longitudinal linear extent of the flexible sheet 10. Each hollow chamber 18 may be independent of the other hollow chambers 18. In some examples, the hollow chambers 18 may be interconnected by embedded tubes 20, extending in a direction around the cross section of the flexible sheet 10, or extending in an angular direction between the longitudinal direction and the direction around the cross section of the flexible sheet 10.

[0099] In some examples, a single opening 16 may be used. In these examples, all of the hollow chambers 18 may be interconnected via embedded tubes 20. The hollow chambers 18 may include a single series of interconnected hollow chambers 18 connected to a single opening 16.

[0100] Although the illustrated example depicts an embedded tube 20 that linearly connects one hollow chamber 18 to another hollow chamber 18 (or opening 16), the embedded tube 20 may include any number of branches that connect to any number of hollow chambers 18 or openings 16. For example, multiple branches of the embedded tube 20 may be used to connect more hollow chambers 18 to fewer openings 16 via a fewer number of interconnected hollow chambers 18 and embedded tubes 20.

[0101] Figure 3 A 3D view of the flexible sheet 10 is shown, wherein the dotted lines represent the hollow chambers 18 and embedded tubes 20 disposed within the thickness of the flexible sheet 10. Figure 3 In the example shown, four series of interconnected hollow chambers 18 are arranged at 90° angles around the cross section of the flexible sheet 10. In the example shown, the shape of the hollow chamber 18 is substantially rectangular. However, it will be appreciated that any suitable shape of the hollow chamber 18, such as an oval or spherical hollow chamber 18, may be used.

[0102] The shape and / or size of the hollow chambers 18 at a particular localized area of ​​the flexible sheet 10 may be selected to provide a particular distribution of cushioning and / or support corresponding to the particular shape of a rigid object disposed adjacent to that localized area. Figure 3In the example shown, the hollow chambers 18 have substantially the same size and substantially the same shape. However, in some examples, the hollow chambers 18 may be of different sizes. Alternatively or additionally, the hollow chambers 18 may be of different shapes.

[0103] Example flexible sheets 10 have been disclosed above. These flexible sheets 10 are configured to enable fluid to be supplied to one or more hollow chambers 18. Examples describing such fluid supply are described below.

[0104] Figure 4 A cross-sectional view of the flexible sheet 10 is shown, wherein a fluid is supplied to the hollow chamber 18. The fluid is supplied to the one or more hollow chambers 18 via the one or more openings 16 and via the one or more embedded tubes 20. The one or more openings 16 are configured to transfer fluid from the one or more fluid sources 22 to the one or more embedded tubes 20 and the one or more hollow chambers 18. Figure 4 In the example shown, there is one fluid source 22 for each opening 16. However, it will be appreciated that one fluid source 22 may supply multiple openings 16 and / or multiple fluid sources 22 may supply one opening 16.

[0105] Fluid source 22 can be any device suitable for supplying fluid. In some examples, fluid source 22 can be an actuator such as a syringe or a pressurized container such as a can. In other examples, fluid source 22 can be a disposable or refillable can, or a fluid supply box. Any of these fluid sources can be connected to the tube connected to opening 16 through an airtight locking mechanism.

[0106] When the fluid source 22 supplies the fluid to the opening, the hollow chamber 18 may be partially or completely filled with the fluid. If the fluid is a gas, the fluid may fill the entire volume of the hollow chamber 18. When the fluid is supplied, the volume of the hollow chamber 18 may increase. The increase in the volume of the hollow chamber 18 may result in an increase in the surface area and / or volume of the flexible sheet 10 corresponding to the local area of ​​the hollow chamber 18 of the flexible sheet 10. The increase in volume may occur at the inner surface of the flexible sheet 10 and / or at the outer surface of the flexible sheet 10. In some examples, the hollow chamber 18 may extend beyond the thickness of the flexible sheet 10 when filled with fluid. The increase in volume and / or surface area is caused by an increase in pressure in the hollow chamber 18, and the increase in pressure is caused by the fluid supply from the fluid source 22. Therefore, it is obvious that by changing the fluid supply from the fluid source 22 to the hollow chamber, the increase in the surface area and / or volume of the flexible sheet 10 at the local area of ​​the hollow chamber 18 can be controlled.

[0107] In the case where the hollow chambers 18 are interconnected by embedded tubes 20, different hollow chambers 18 can receive different amounts of fluid and thus be under different pressures. Alternatively or additionally, different fluid sources 22 can be configured to supply different amounts of fluid to different openings 16, thereby supplying to different hollow chambers 18. The different amounts of fluid supplied to each hollow chamber 18 can result in different increases in surface area and / or volume at each corresponding local area of ​​the flexible sheet 10 corresponding to each hollow chamber 18. In these ways, the thickness of the flexible sheet 10 can be differentiated in specific local areas and at different points in time.

[0108] In some examples, the fluid can be a gas, such as air or carbon dioxide. In these examples, the fluid is a compressible fluid. In these examples, the flexible sheet 10 can change the shape and / or size of adjacent rigid surfaces more flexibly than using liquids. The gas can be supplied by a reservoir of compressed fluid, such as a compressed fluid cylinder or tank. In this way, the fluid can change the shape and / or size of adjacent rigid surfaces of the flexible sheet 10 by using the energy released by the decompression of the fluid. In examples where the flexible sheet 10 is part of a larger device (e.g., a prosthesis), the reservoir can be attached or supported on the device. This is particularly convenient, for example, when considering a prosthesis, the flexible sheet 10 can be part of the internal lining of the socket, and the compressed fluid tank can be arranged on the outside of the prosthesis and connected to the lining by, for example, a tube.

[0109] The use of a compressed fluid reservoir also has the following advantages: the filling of the flexible sheet 10 can be controlled by simply opening and closing a valve or a set of valves connecting the reservoir and the flexible sheet 10 using a control circuit. That is, the pressure in the compressed fluid reservoir causes gas to flow into the flexible sheet 10, and if the pressure in the flexible sheet needs to be reduced, the gas can be simply released into the surrounding air or into another collection tank. Since the energy released by the decompression of the pressurized gas transports the fluid into the embedded tube 20 and the hollow chamber 18, the need for a power transportation system can be eliminated, such as the need for a pump or motor that supplies and / or circulates the compressible fluid in the flexible sheet 10. Therefore, the elimination of the need for such a motor or pump leads to an improved design that can be lighter and / or quieter and has lower power consumption. In that case, when the reservoir is exhausted, the reservoir can be removed and replaced. In other words, the reservoir can be replaceable, refillable and / or disposable.

[0110] Another advantage of using a compressible fluid is that (e.g., compared to using a liquid) it minimizes the weight of the flexible sheet 10 and the reservoir. Again, this is particularly advantageous when considering use scenarios for prostheses where additional weight is undesirable. Thus, in those use scenarios, compressed gas provides the dual advantage of reducing the weight of the fluid itself, as well as reducing weight by not requiring an additional pump / motor for transferring the fluid from the reservoir to the flexible sheet 10.

[0111] Another advantage of using a compressible fluid is that decompression of the fluid results in a drop in the temperature of the released gas, which can be used to cool an object in contact with the flexible sheet 10. The circulation of the gas within the embedded tubes 20 and hollow chambers 18 of the flexible sheet 10 can be controlled by a control circuit that receives data from electronic sensors such as flow meters, temperature sensors, and pressure sensors to be described later. The controlled circulation of the cooler gas within the flexible sheet 10 may not result in an increase in the surface area and / or volume of the flexible sheet 10 at a localized area of ​​the hollow chamber 18, but only affects the temperature of the flexible sheet 10.

[0112] In other examples, the fluid can be a liquid. In these examples, the fluid can be an incompressible fluid. In these examples, the flexible sheet 10 can better resist changes in the shape and / or size of adjacent rigid surfaces than using gases. It is understood that different types of fluids can be supplied to different openings 16 of the flexible sheet 10. For example, while a first fluid source can supply gas to a first opening, a second fluid source can supply liquid to a second opening. The first fluid and the second fluid can be selected based on the surface geometry of one or more adjacent rigid surfaces and / or the distribution of the hollow chamber 18 and the embedded tube 20 disposed in the flexible sheet 10.

[0113] therefore, Figure 4 The configuration is set to enable the flexible sheet 10 to change size and / or shape in response to at least one of the parameters such as the supply of fluid from one or more fluid sources 22, the distribution of hollow chambers 18 in the flexible sheet 10, the interconnection of the hollow chambers through the embedded tubes 20, and the type of fluid supplied to each opening 16. These parameters can be selected so as to obtain the desired size and / or shape of the flexible sheet 10. In particular, these parameters can be selected to configure the flexible sheet 10 to have a size and / or shape corresponding to a rigid surface, a plurality of rigid surfaces, or a space between a plurality of rigid surfaces. This can provide improved cushioning and / or support for one or more rigid surfaces.

[0114] Figure 5A 3-D view of a flexible sheet 10 is shown, wherein a fluid is supplied to a flexible chamber. Although three series of interconnected hollow chambers 18 are shown, it should be understood that other arrangements are possible. The 3D distribution of the hollow chambers 18 filled with fluid around the flexible sheet demonstrates the ability to provide support for a three-dimensional rigid object. In particular, the devices and techniques described herein can be used to provide support and cushioning that is differentiated in both space and time.

[0115] In use, the flexible sheet 10 can be configured to conform to the current size and / or shape of one or more rigid surfaces. In use, the flexible sheet 10 can provide an interface between multiple rigid surfaces and / or can conform to a single rigid surface. When using the flexible sheet, the increase in pressure in the hollow chamber 18 caused by the increase in the supplied fluid will cause the increase in the surface area and / or volume of the flexible sheet 10 at the local area of ​​the hollow chamber 18. This may cause an increase in pressure and / or friction between the flexible sheet 10 and one or more rigid surfaces at the local area. The friction force provides an effective force opposite to the force acting on separating the flexible sheet 10 from the one or more rigid surfaces. Therefore, the flexible sheet 10 can be more effectively attached to or support one or more rigid surfaces.

[0116] As described above, the parameters that can be controlled to change the size and / or shape of the flexible sheet 10 include the supply of fluid from one or more fluid sources 22, the distribution of the hollow chambers 18 in the flexible sheet 10, the interconnection of the hollow chambers through the embedded tubes 20, and the type of fluid supplied to each opening 16. One or more of these parameters can be changed in response to changes in the size and / or shape of one or more rigid surfaces. In particular, changing one or more of the above parameters during the use of the flexible sheet 10 can enable the flexible sheet 10 to fit more closely to the one or more rigid surfaces, even if the geometry of the one or more rigid surfaces changes over time.

[0117] For example, a reduction in the size of a rigid surface adjacent to the flexible sheet 10 may result in a reduction in pressure within the flexible sheet 10 relative to the pressure generated by the fluid supplied by the fluid source 22. This may be sensed by a sensor disposed between the opening 16 and the fluid source 22. In response, the fluid source 22 may increase the supply of fluid to the hollow chamber 18, thereby increasing the surface area and / or volume of the flexible sheet 10 at the localized region of the hollow chamber 18. This may enable the flexible sheet 10 to better support the changed size and / or shape of one or more rigid surfaces by utilizing the increased surface area and / or volume of the flexible sheet 10 at the localized region of the hollow chamber 18.

[0118] Alternatively, or in addition, the size of one or more rigid surfaces may be increased. This may cause the pressure within the flexible sheet 10 to increase to exceed the pressure generated by the fluid supplied by the fluid source 22. Accordingly, the fluid source may be configured to reduce the fluid supply to the hollow chamber 18 and / or implement a pressure change so as to extract fluid from the hollow chamber 18 to reduce the surface area and / or volume of the flexible sheet 10 at the local area of ​​the hollow chamber 18. This can enable the flexible sheet 10 to better support the changed size and / or shape of the rigid surface by utilizing the reduced surface area and / or volume of the flexible sheet 10 at the local area of ​​the hollow chamber 18.

[0119] The fluid supply by the fluid source 22 can be controlled in various ways. A control circuit can be used to control the fluid source 22. The control circuit can include an electronic sensor and a control logic for controlling the fluid source 22. In some examples, the control circuit is configured to control the fluid source based on feedback from the sensor. For example, if the pressure sensor senses a low pressure, the control logic can control the fluid source 22 to increase the fluid supply to the flexible sheet 10. If the pressure sensor senses a high pressure, the control circuit can control the fluid source 22 to reduce the fluid supply to the flexible sheet 10 and / or extract fluid from the flexible sheet 10. As described later, other sensors other than the pressure sensor (e.g., accelerometers, temperature sensors, flow meters, flow sensors, gyroscope sensors, GPS sensors, or clocks) can be used to perform control according to the user's activities. In some examples, the control circuit can use one or more valves to control the fluid source 22. One or more valves can be used to extract fluid from the flexible sheet 10 to a reservoir and / or an external environment. In addition, or alternatively, one or more valves can be provided in one or more embedded tubes 20 to control the fluid flow between one or more openings 16 and / or one or more hollow chambers 18.

[0120] Additionally or alternatively, the control circuit can be configured to control the fluid source based on input from the user. In other examples, the control circuit is configured to control the fluid source 22 based on input from a mobile device. For example, the user can use an application installed on the mobile device to control the fluid source 22. A combination of these control devices can be used. This can optimize the control of the fluid source 22 and / or enable different control devices to be applied at different times.

[0121] Data related to the control of one or more fluid sources 22 can be recorded in a data memory. The data storage and control logic can be used to identify characteristic patterns and / or sequences in the data. For example, the data can show that a specific average amount of fluid is supplied by one or more fluid sources at night. This is an example of a control mode associated with a user's routine or schedule. This pressure change and control mode can be identified in advance. Alternatively, the data can indicate that a specific periodic pattern of fluid supply occurs during a specific movement such as walking or riding a bicycle. These are examples of control modes associated with specific activities. User analysis and / or machine learning techniques can be used to develop strategies that can identify the current motion category of the user of the flexible sheet or the object to which the flexible sheet applies contact when the movement is occurring, or can predict specific controls that will be needed based on the user's routine or schedule. One or more fluid sources 22 can use the identified motion category and / or the predicted routine to pre-regulate the fluid supply based on the recorded data and the identified motion category and / or the predicted routine. Whether or not a mobile device is used, the user can appropriately override the pre-set fluid supply. The logic may also analyze user override commands and manual inputs entered via a mobile device or hardware buttons directly integrated into a device associated with the flexible sheet to further understand the user's personal preferences and control the fluid source 22 for optimal personalized performance.

[0122] In other words, by recording data from sensors associated with the device equipped with the flexible sheet and data related to past control operations, information about the user's daily habits and preferences can be determined. These habits may be related to how the user sets the pressure for a particular type of activity, but may also be related to when a particular activity occurs or how the pressure is set at different times of the day. Such information can be obtained from a pressure sensor associated with the flexible sheet 10, but can also be obtained from other types of sensors. For example, the use of GPS information allows determination of a particular activity / control strategy adopted in a particular location (e.g., in a park compared to at home); or the use of a temperature sensor allows determination of how to change the control strategy based on weather and / or fluid temperature within the flexible sheet 10; or the use of an accelerometer allows more precise distinction between different types of motion; or the use of a clock allows a control strategy based on the user's daily routine to be determined. Alternatively and / or additionally, a flow meter or flow sensor can measure the flow rate of the fluid to control the duration of the increase in the surface area and / or volume of the flexible sheet 10. Similar to the above-mentioned sensor feedback, these readings can be used to analyze the recorded data and / or can be used to derive information about the user's daily habits and preferences.

[0123] Of course, all of this information can be used together, such as through machine learning methods, to create rules that can form the basis of a control strategy that is both responsive and predictive based on current sensor feedback and past control inputs. That is, the control circuit can read the data of the recorded user movement to match the data with the corresponding periodic pattern in the pressure change history. By combining machine learning techniques with at least one of the user's limb movement, manual override instructions, or previous pressure characteristics and patterns, an artificial intelligence control mechanism can be implemented to control the fluid supply to the flexible sheet 10.

[0124] The system can then preemptively implement or suggest such control (e.g., providing notifications to the user through the device itself or the user's mobile device) based on the user's preferences. This analysis can be performed by a device equipped with the flexible sheet 10, or it can be performed remotely. That is, the device can have a control circuit that is configured to record feedback from sensors and past control operations, and determine a characteristic pattern or sequence of periodic patterns and / or controls indicating a motion category, and then make the implemented control based on those determined patterns. Alternatively, the device can be configured to transmit the recorded feedback from at least one sensor and past control operations to another device, such as a mobile device or a cloud computer or server. Then, the other device can perform analysis to determine a characteristic pattern or sequence of periodic patterns and / or controls indicating a motion category. Then, data about those patterns can be sent back to the device combined with the flexible sheet, which can then be controlled based on those determined patterns. In either case, it is best to perform control on the device and matching between sensor feedback and previously determined patterns to ensure that it can continue to operate when communication with an external device is interrupted. However, in some cases, the matching can also be achieved remotely.

[0125] In use, supplying fluid to the hollow chamber 18 via the fluid source 22 may result in increased support of the object by the flexible sheet 10. Alternatively or additionally, supplying fluid to the hollow chamber 18 via the fluid source 22 may result in increased friction between the flexible sheet and the object.

[0126] Although the above exemplary use of the flexible sheet has been described with respect to one or more rigid surfaces, it should be understood that the flexible sheet is suitable for use with a wide variety of one or more objects or surfaces. Although the figures show examples of flexible sheets having parabolic cross-sections, it should be understood that other geometric shapes of the flexible sheet are also possible.

[0127] The disclosed examples include using a flexible sheet to substantially annularly surround an object. In addition, the disclosed examples include using a flexible sheet to support or cushion one or more sides of an object. For example, in use, the flexible sheet can be used as a part of a mattress or used in combination with a mattress to provide improved support or cushioning for an object placed on the mattress and / or the flexible sheet. In these examples, the object can be a body part. In use, the flexible sheet can be used as a part of a shoe or sock or used in combination with a shoe or sock to improve the fit of the shoe or sock to the user's foot and / or leg. In another example, in use, the flexible sheet can maintain contact with the residual limb so that the prosthesis is suspended from the residual limb and provides increased support to the residual limb.

[0128] In these examples, supplying fluid to the hollow chambers 18 of the flexible sheet 10 when the flexible sheet 10 is in use may produce at least one of the following effects: improved support for an object in contact with the flexible sheet 10 , improved cushioning, increased friction, and better adhesion.

[0129] Figure 6 A method of fitting a liner to a body part is shown. The liner may include a flexible sheet 10 as described in any of the examples set forth herein. The liner may include a flexible sheet 10 having a circular cross-section along at least a portion of the longitudinal axis of the flexible sheet and having a hollow chamber 18 disposed within the thickness of the flexible sheet 10 at a localized area of ​​the flexible sheet 10.

[0130] In step 24, the method may include inserting a body part into the interior of the liner. The body part may be a limb such as a leg or arm, a head, or any other body part for which a liner or flexible sheet 10 as described herein is suitable. The interior of the liner may include an area within the perimeter defined by the annular cross-section of the flexible sheet 10 of the liner.

[0131] In step 26, a control circuit can be used to control the fluid source 22. The control circuit can include one or more electronic sensors and control logic described herein. The control of the fluid source 22 can be based on at least one of feedback from a sensor, user input, and input from a mobile device. It can also employ the artificial intelligence (AI) / machine learning techniques discussed above to provide personalized and predictive control. In some examples, feedback from user input can be implemented through built-in hardware components.

[0132] In step 28, a fluid may be supplied to the hollow chambers 18 via the openings in the lined flexible sheet 10 and using the fluid source 22 to cause an increase in the surface area and / or volume of the flexible sheet 10. As described herein, the increase in surface area and / or volume may occur at localized regions of the flexible sheet 10 corresponding to the hollow chambers 18.

[0133] although Figure 6 The methods listed in are presented in a certain order, but should not be limited to the order presented. In some examples, the fluid source 22 can be controlled and / or the fluid can be supplied to the hollow chamber 18 before the body part is inserted into the interior of the liner.

[0134] In addition, although for ease of explanation, Figure 6 A single fluid source 22, hollow chamber 18 and opening 16 are mentioned in the present disclosure, but it will be apparent from the discussion throughout this disclosure that a plurality of these elements may also be present. Figure 6 methods are used in combination.

[0135] Figure 7 A method of forming a flexible sheet 10 is shown. The flexible sheet 10 may be a flexible sheet 10 described in any of the examples set forth herein. The flexible sheet 10 may have a circular cross-section along at least a portion of the longitudinal axis of the flexible sheet, and have a hollow chamber 18 disposed within the thickness of the flexible sheet 10 at a localized area of ​​the flexible sheet 10. In other examples, the flexible sheet 10 may be planar or substantially planar. In other examples, the flexible sheet 10 may have a parabolic shape. The flexible sheet 10 may include a combination of the above-mentioned geometric figures.

[0136] In step 30, the molding material may be cured to form a cured polymer including the hollow chamber 18 and the embedded tube 20. As disclosed herein, a plurality of hollow chambers 18 and / or a plurality of embedded tubes 20 may be used. The molding material may be cured around the three-dimensionally printed mold to form a cured polymer including the hollow chamber 18 and the embedded tube 20. Additional layers of the cured polymer may be attached to the cured polymer to form enclosed hollow chambers and embedded tubes. The cured polymer may be configured such that its embedded tubes extend to an opening 16 that is connected to the exterior of the cured polymer.

[0137] In some examples, the edges and / or corners of the 3-D printed mold can be rounded to prevent sticking (ie, to make demolding easier). The 3-D printed mold can be coated with a release agent to reduce surface tension. The molding material can be degassed before curing.

[0138] In step 32, a cured polymer may be disposed on the inner mold. The inner mold may be rigid and / or hard. The inner mold may be formed using 3D printing. The inner mold may have a shape substantially similar to the shape of the flexible sheet 10 to be formed. The cured polymer may be disposed on the inner mold so that an opening of the cured polymer is disposed at an end of the inner mold, such as at a proximal end or a distal end of the inner mold. In some examples, multiple pieces of cured polymer may be disposed on the inner mold.

[0139] In step 34, uncured molding material is added to the outer mold. The outer mold can be rigid and / or hard. 3-D printing can be used to form the outer mold. The outer mold can have a shape substantially similar to the shape of the flexible sheet 10 desired to be formed. The outer mold can have a shape substantially similar to the shape of the inner mold and have a larger size than the inner mold. The amount of the uncured molding material can be selected based on the size of the inner mold, the outer mold, and one or more pieces of cured polymer.

[0140] In step 36, the inner mold may be inserted into or positioned adjacent to the outer mold so that the uncured molding material is in contact with the cured polymer. This may result in the uncured molding material substantially covering the one or more pieces of cured polymer. A force may be applied to the inner mold relative to the outer mold to ensure that the proper position of the inner mold relative to the outer mold is maintained.

[0141] In step 38, the uncured molding material may be cured while in contact with the curing polymer to form the flexible sheet 10. The curing may be performed such that the cured polymer including the hollow chamber 18 and the embedded tube 20 is integrally formed with the formed flexible sheet 10.

[0142] In step 40, the inner mold and the outer mold may be removed from the flexible sheet 10. The flexible sheet may substantially retain the shape of the inner mold and / or the outer mold.

[0143] The above method may include curing an uncured polymer in contact with a cured polymer to form a complex cured object, such as a flexible sheet 10. The flexible sheet may include a hollow chamber 18 and an embedded tube 20. In some examples, the polymer may include an elastomer. In some examples, the polymer may include silicone.

[0144] Thus, an improved flexible sheet having a hollow chamber and an improved control method are disclosed.

[0145] It should be understood by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, it is not limited to the disclosed exemplary embodiments. Various modifications, combinations, sub-combinations and alterations may occur, depending on design requirements and other factors, as long as they are within the scope of the attached claims or their equivalents. The features of any example or embodiment of the present disclosure may be combined with the features of any other example or embodiment of the present disclosure.

Claims

1. A device comprising: a flexible sheet having a hollow chamber disposed within the thickness of the flexible sheet at a localized region of the flexible sheet, and an opening for conveying a fluid between an exterior of the flexible sheet and the hollow chamber; a fluid source configured to supply a fluid to the hollow chamber via the opening to cause at least one of a surface area or a volume of the flexible sheet in the localized region to increase; and a control circuit for controlling the fluid source, wherein the control circuit includes at least one electronic sensor; wherein the control circuit is configured to identify the user's motion category and predict a desired change in pressure in the hollow chamber by transmitting recorded feedback from the at least one sensor and past control operations to a remote device and receiving from the remote device data related to a periodic pattern of pressure changes indicative of the user's motion category and a characteristic pattern or sequence of controls; and The control circuit is configured to perform the control operation by preliminarily controlling the supply of the fluid into or out of the hollow chamber.

2. The device according to claim 1, characterized in that The control circuit is configured to determine the control operation based on feedback from the at least one sensor.

3. The device according to claim 2, characterized in that The control circuit is configured to determine the control action by identifying the motion class by matching the feedback to a periodic pattern indicative of the motion class.

4. The device according to claim 2 or claim 3, characterized in that The control circuit is configured to determine the control action by predicting the desired change by matching the feedback to a characteristic pattern or sequence indicative of the desired change based on past control actions.

5. The device according to claim 1, characterized in that The control circuit is configured to record feedback from the at least one sensor and / or past control operations and analyze the recorded feedback to determine a periodic pattern indicative of a category of motion and / or a characteristic pattern or sequence of control.

6. The device according to claim 1, characterized in that The control circuit is configured to perform the determined control operation in response to a user input.

7. The device according to claim 1, characterized in that The control circuit is configured to automatically perform the determined control operation.

8. The device according to claim 1, characterized in that A plurality of fluid sources are configured to supply fluid to one or more of the openings in the flexible sheet.

9. The device according to claim 8, characterized in that The fluid is a gas.

10. The device according to claim 1, characterized in that The fluid source is a compressed fluid source.

11. The device according to claim 10, characterized in that The compressed fluid source is a compressed fluid tank.

12. The device according to claim 10, characterized in that The source of compressed fluid may be replaceable or refillable.

13. The device according to claim 10 or 12, characterized in that The control circuit is configured to control the supply of fluid into the hollow chamber by releasing gas from the compressed fluid source into the hollow chamber and / or to control the supply of fluid out of the hollow chamber by releasing gas outside the hollow chamber and optionally outside the device.

14. The device according to claim 1, characterized in that The device is one of the following: a mattress, a wheelchair, a prosthesis, a helmet, a ski boot, a shoe sole, or a medical or non-medical device for contacting the skin.

15. A system comprising a device according to any one of claims 1 to 14 and a remote device away from the device, characterized in that: The remote device is configured to analyze recorded feedback from the at least one sensor and / or past control operations to determine a periodic pattern and / or characteristic pattern or sequence of control indicative of a category of motion, and to send data regarding the periodic pattern and / or characteristic pattern or sequence of control indicative of a category of motion to the device.

16. A method of controlling the expansion of a flexible sheet, the flexible sheet having a hollow chamber disposed within the thickness of the flexible sheet at a localized area of ​​the flexible sheet, and an opening for conveying a fluid between an exterior of the flexible sheet and the hollow chamber, the method comprising: Identifying a user's motion category and predicting a desired change in pressure in the hollow chamber by transmitting recorded feedback from at least one sensor and past control operations to a remote device and receiving from the remote device data relating to a periodic pattern of pressure changes and a characteristic pattern or sequence of controls indicative of the user's motion category; determining a control operation based on the identified motion category or the predicted desired change in pressure in the hollow chamber; and The control operation is performed by preliminarily controlling the supply of the fluid into or out of the hollow chamber.

17. The method according to claim 16, characterized in that Also included is identifying the motion class by matching sensor feedback to a periodic pattern indicative of the motion class to thereby determine the control action.

18. The method of claim 16, further comprising determining the control action by predicting the desired change by matching sensor feedback to a characteristic pattern or sequence indicative of the desired change based on past control actions.

19. The method of claim 17, further comprising determining the control action by predicting the desired change by matching sensor feedback to a characteristic pattern or sequence indicative of the desired change based on past control actions.

20. The method according to any one of claims 16 to 19, further comprising: recording information regarding sensor feedback associated with the flexible sheet and past control operations of the flexible sheet; as well as The recorded information is analyzed to determine characteristic patterns or sequences indicative of periodic patterns and / or control of the type of movement.

21. The method according to claim 20, characterized in that The steps of identifying and determining are based on characteristic patterns or sequences of periodic patterns and / or controls indicative of the type of movement.

22. A computer-readable storage medium having a computer program stored thereon, the computer program comprising codes, which when executed by a computer system instruct the computer system to implement the method of any one of claims 16 to 21.

23. A computer system for controlling expansion of a flexible sheet, the system comprising at least one processor and a memory storing code which, when executed, implements the method of any one of claims 16-21.

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