HEAT TRANSFER UNIT, APPARATUS AND ASSOCIATED METHOD

Abstract

A heat transfer unit adapted to be applied to a human face in order to transfer heat to / from the human face comprises a first flexible material layer and a second flexible material layer defining a fluid chamber therebetween, allowing a heat transfer fluid to flow through the fluid chamber. The first and second flexible material layers are connected to one another at a plurality of connection locations. The heat transfer unit is dimensioned such that, when applied to a human face, it can cover at least 70% of the surface of the human face. The heat transfer unit can be used to heat or cool a human face, in particular in a thermal therapy treatment of a human face, and in particular in the treatment of tissue damage after surgical interventions, injuries or inflammations.

Description

"HEAT TRANSFER UNIT, APPARATUS AND ASSOCIATED METHOD"

[0001] This application claims priority over Luxembourg Patent Application No. LU 503597, filed on March 9, 2023, the full content of which is incorporated herein by reference.

[0002] The present invention relates to a heat transfer unit, a facial cuff assembly and a heat transfer apparatus for use in the thermal treatment of a human face, in particular for use in the thermal therapy treatment of a human face and, in particular, for use in the treatment of tissue damage after surgical interventions, injuries, inflammations, as well as a method of heating or cooling a human face.

[0003] In the context of the present invention, the terms heat treatment and heat therapy treatment should be understood as a treatment in which heat is supplied to or removed from the human face.

[0004] Preferably, it is not a matter of supplying heat or removing heat from the whole body, as is done, for example, in a sauna and subsequent immersion in a cold water immersion pool, but rather of specifically supplying heat or specifically removing heat from the face in order to obtain an effect, in particular a therapeutic effect, preferably without significantly supplying heat or removing heat from the rest of the human body.

[0005] Document W02022 / 101320 discloses a heat transfer unit suitable for application to various regions of the human body, as well as a heat transfer apparatus.

[0006] An object of the present invention is to provide an alternative heat transfer unit and heat transfer apparatus, in particular a further improved heat transfer unit and heat transfer apparatus, as well as an associated face cuff assembly and associated method.

[0007] Aspects of the present invention are presented. Petition 870250081032, dated 09 / 09 / 2025, p. 85 / 126 2 / 32 in the claims. Each feature disclosed and / or illustrated in this descriptive report may be incorporated into the invention, alone or in combination with any other feature disclosed or illustrated in this document, unless such combination is explicitly excluded or technically impossible. This relates to both aspects of the apparatus and aspects of the method, as well as their preferred embodiments. Thus, for example, any of the devices disclosed in this document may be used in the context of any of the methods disclosed in this document, and vice versa.

[0008] According to a first aspect, the present invention provides a heat transfer unit adapted for application to a human face in order to transfer heat to / from the human face,

[0009] wherein the heat transfer unit comprises a first layer of flexible material and a second layer of flexible material defining a fluid chamber between them, allowing a heat transfer fluid to flow through the fluid chamber,

[0010] in which the first and second layers of flexible material are connected to each other at a plurality of connection points,

[0011] wherein the heat transfer unit is sized so that, when applied to a human face, it can cover at least 70% of the surface of the human face.

[0012] The present inventor realized that existing heat transfer units tend to cover only a relatively small portion of the human face, such as the eye region, for example, a region between a first approximately horizontal line located about 2 or 3 cm above the eyes and a second approximately horizontal line located about 2 or 3 cm below the eyes. He further realized that it would be useful to provide a heat transfer unit capable of covering a larger proportion of the human face.

[0013] In the context of the invention, the term human face should preferably be understood as a human face of size and shape Petition 870250081032, dated 09 / 09 / 2025, page 86 / 126 3 / 32 average, in particular of an adult. Additionally, for the purposes of this application, a human face should preferably be understood as the frontal part of a human head extending to the hairline and additionally including the ears, cheeks and chin, reaching the front of the chin or including the portion of the human head extending backward from the front of the chin to, but excluding, the neck.

[0014] Preferably, when applied to a human face, the heat transfer unit is in sufficiently close contact with the human face (or a large proportion thereof) to ensure efficient heat transfer.

[0015] The first and second layers of flexible material may be substantially impermeable, so as to form a substantially impermeable fluid chamber (in addition to any external connections described below). The first and second layers of flexible material may be made of the same material or of different materials, for example, plastic material such as low-density polyethylene (LDPE). Other examples include polyurethane. The first and second layers of flexible material may, for example, have a thickness of at least 0.1, 0.15, 0.2 or 0.25 mm and / or at most 0.5, 0.45, 0.4, 0.35 or 0.3 mm.

[0016] Since the first and second materials are flexible, the heat transfer unit can be at least partially wrapped around the face and adapt to its individual shape to result in at least partial contact of the heat transfer unit, in particular the first layer of flexible material, with the face. At least some embodiments may allow better, or more complete, contact between the heat transfer unit and the face than was possible with prior art heat transfer units.

[0017] When a heat transfer fluid warmer than the face is made to flow through the fluid chamber, heat is transferred to the face, warming it. When a heat transfer fluid colder than the face is made to flow through the fluid chamber, heat is transferred away from the face, cooling it. This Petition 870250081032, dated 09 / 09 / 2025, page 87 / 126 4 / 32 last one can be used in particular after surgical interventions affecting the face, in particular facial feminization surgery or facial masculinization surgery.

[0018] The connection points where the first and second layers of material are joined to each other can be individual, relatively small regions, and can, for example, be substantially round or of any other suitable shape. The connection points are sometimes also called points.

[0019] To connect the first and second layers of material at the connection points, the first and second layers of material can be fused or welded together at selected locations. Alternatively, adhesive material can be used to connect the first and second layers of material at the connection points. Suitable methods for connecting the first and second layers of material are, in principle, known to those skilled in the art and will not be described in detail.

[0020] In addition to being connected at the (individual) connection points, the first and second material layers are connected at their periphery, in particular along their entire periphery, with the possible exception of any external fluid connections – although any external fluid connections may alternatively be provided only at the first and / or second material layer, in which case the first and second material layers may be connected along their entire periphery without interruption. The first and second material layers may be connected at their periphery using the same technique or a technique similar to the technique used to connect the first and second material layers at the connection points. In particular, the joining of the first and second material layers at the connection points and along their periphery may be performed simultaneously, in particular using the same processing apparatus.

[0021] The connection points serve to locate the first and second layers of material in relation to each other. Individual spaces or passages for the heat transfer fluid are formed between the Petition 870250081032, dated 09 / 09 / 2025, page 88 / 126 5 / 32 connection points, as well as between the connection points and the periphery of the heat transfer unit. Therefore, the connection points should be kept relatively small so as not to unduly obstruct the flow of the heat transfer fluid. On the other hand, the connection points may need to be large enough to ensure a firm connection between the first and second layers of material.

[0022] The average spacing between connection points in the first and second regions can be determined in several ways. For example, one can consider a square or round area of ​​the heat transfer unit (or the first and second layers of flexible material), this area having at least 4, 5, 6 or more connection points. For each connection point, the nearest neighbor(s) (nearest neighbor connection point(s)) must be determined, as well as the distance between the respective connection point and its nearest neighbor(s). The average of these distances then indicates the average spacing between connection points in that region.Alternatively, the average density of connection points within a specific area can be determined, for example, by determining the number of connection points in the respective area of ​​the heat transfer unit, or the total surface area occupied by the connection points in the respective area of ​​the heat transfer unit. The number of connection points in the respective area of ​​the heat transfer unit or the total surface area occupied by the connection points in the respective area of ​​the heat transfer unit can then be placed in relation to the surface area under consideration, so as to provide a measure of the average spacing between connection points in the respective area of ​​the heat transfer unit. Other ways of determining the average spacing between connection points may be conceivable.

[0023] The connection points may, for example, have a diameter of at least 2, 3 or 4 mm and at most 10, 9, 8, 7 or 6 mm. A preferred diameter may be about 5 mm, for example, 5 mm + / - 0.5 mm. The distance between the nearest neighbors of the connection points (center to center) may, for example, Petition 870250081032, dated 09 / 09 / 2025, page 89 / 126 6 / 32 can be at least 10, 12, or 14 mm and at most 25, 20, 18, or 16 mm. A preferred distance (center to center) can be about 15 mm, for example, 15 mm + / - 0.5 mm. The connection points can, for example, form a regular or irregular pattern, or a combination of regular and irregular patterns. In a regular pattern, the connection points can, for example, be arranged so that the three nearest neighbors of the connection points form an equilateral triangle, or so that the four nearest neighbors of the connection points form a square.

[0024] In one embodiment, the heat transfer unit is sized so that, when applied to a human face, it can cover at least 75%, 80%, 85%, or 90% of the surface of the human face. A higher percentage of coverage can help ensure sufficient and effective heat transfer to / from the face and can, in particular, allow heat transfer over a larger portion of the human face. This can also result in greater comfort for the person on whose face the heat transfer unit is applied (in this document also referred to as the user), since any pressure exerted by the heat transfer unit on the face is distributed over a larger area.

[0025] In one embodiment, the heat transfer unit is sufficiently flexible so that, when applied to a human face, it can be in direct contact with at least 65%, 70%, 75%, 80%, 85%, or 90% of the surface of the human face. The percentage of the face surface that is in direct contact with the heat transfer unit is expected to be slightly less than the percentage of the face surface that is covered by the heat transfer unit. This is because small air pockets may remain between the face and the heat transfer unit, for example, at the connection points, where the heat transfer unit may not be in direct contact with the face, since the first and second layers of flexible material effectively meet at the connection points and expand between the connection points.Additionally, (small) creases may develop where the heat transfer unit is flexed to adapt to the shape of the face. Petition 870250081032, dated 09 / 09 / 2025, pages 90 / 126 7 / 32

[0026] In one embodiment, the heat transfer unit has one or more cutouts for one or more of: one or both eyes, a nose, and a mouth. In other words, the heat transfer unit does not cover these regions. This may allow the user to see, breathe, speak, eat, and / or drink while using the heat transfer unit.

[0027] In one embodiment, the heat transfer unit comprises an inlet port and an outlet port for connection to a heating or cooling device to allow heat transfer fluid to flow between the heating or cooling device and the heat transfer unit. The inlet and outlet ports may be permanently connected to conduits, such as hoses or the like, for connection to a heating or cooling device. Alternatively, the inlet and outlet ports are suitable for temporary connection to such a conduit. Suitable inlet / outlet ports are known in the art and therefore will not be described in detail.

[0028] In one embodiment, the fluid chamber has a capacity of less than 300 ml, in particular less than 250 ml or less than 200 ml or less than 180 ml or less than 160 ml or less than 150 ml, in particular where the fluid chamber has a capacity of about 140 ml.

[0029] The inventor has found that this volume is sufficient to ensure good contact between the heat transfer unit and an average human face. A relatively small volume of the fluid chamber may mean that the capacity of any heating or cooling device to be used with the heat transfer unit may also be reduced accordingly and / or that replenishment of the heat transfer fluid during operation becomes unnecessary.

[0030] In one embodiment, when the heat transfer unit is used in conjunction with a heat transfer fluid at a temperature of 15 °C to cool the face of an average adult, the surface temperature of the face reaches 22 °C or less within 15 minutes of operation of the heat transfer unit. This assumes that the heat transfer unit Petition 870250081032, dated 09 / 09 / 2025, page 91 / 126 8 / 32 heat should be used in an environment with normal temperature and humidity.

[0031] In one embodiment, the heat transfer unit comprises compartmentalization lines, in particular welding lines or fusion lines, to compartmentalize the fluid chamber, in particular to guide the heat transfer fluid along a desired path through the fluid chamber.

[0032] On (or along) the compartmentation lines, the first and second material layers are connected to each other, for example, using the same technique or a technique similar to the technique used to connect the first and second material layers at the connection points. In particular, the joining of the first and second material layers at the connection points, along the periphery of the heat transfer unit and along the compartmentation lines can be carried out simultaneously, in particular using the same processing apparatus.

[0033] Although it is preferable that, in compartment lines, the first and second layers of material be connected in an impermeable manner, it would also be acceptable that there not be a 100% impermeable seal along the compartment lines. This would simply mean that (a relatively small proportion) of the heat transfer fluid could take a shortcut instead of following the desired path. However, the fluid flow through any compartment lines should be significantly less than the fluid flow along the desired path, for example, no more than 20%, 10% or 5% of the total fluid flow.

[0034] In one modality, the desired path has several curves or turns, particularly when the desired path is a labyrinthine path.

[0035] The width of each individual section of the path is expected to be significantly smaller than the width of the entire heat transfer unit. This can help ensure that the heat transfer fluid flows along virtually the entire (internal) surface of the unit. Petition 870250081032, dated 09 / 09 / 2025, page 92 / 126 9 / 32 transfer. On the other hand, if each individual section of the path had a relatively large width, the probability of the fluid flow not reaching certain areas would increase, for example, near the periphery of such a wide path section.

[0036] In one embodiment, the heat transfer unit comprises one or more additional layers, in particular an inner (additional) layer and / or an outer (additional) layer, in particular wherein the inner layer is arranged to face the human face and / or the outer layer is arranged to face away from the human face, in particular wherein the inner layer and / or the outer layer comprises a fabric layer.

[0037] Providing an additional inner layer can make the heat transfer unit more comfortable to use, especially if the first and second layers of material are made of a plastic material.

[0038] An additional outer layer, again made of fabric, for example, can help ensure that one portion of the heat transfer unit can be (temporarily) attached to another portion, particularly if a hook and loop fastener is used. For this purpose, one portion of the heat transfer unit can be provided with the hook element of a hook and loop fastener, and another portion of the heat transfer unit can be provided with the loop element of a hook and loop fastener. Alternatively, the loop element can be omitted if the hook element can (temporarily) be attached directly to the outer layer (such as a fabric layer).

[0039] In one embodiment, the heat transfer unit is arranged to be transferred from a substantially flat condition to a flexed or bent condition when applied to a human face. This allows the heat transfer unit to be manufactured as a flat item, which facilitates manufacturing and storage.

[0040] For the purposes of this descriptive report, the term folding (of the heat transfer unit) should not be understood to mean folding a thin sheet of paper, which would result in a very sharp edge. Petition 870250081032, dated 09 / 09 / 2025, page 93 / 126 10 / 32 Instead, the term "bending" should be understood in the sense of flexing the heat transfer unit to result in significantly larger radii of curvature than in the case of folding a thin sheet of paper.

[0041] In one embodiment, the heat transfer unit comprises a central portion and a plurality of lobes connected to the central portion. The central portion may, for example, occupy an area corresponding to the eye, nose, and mouth regions and extend a few centimeters outward from them (but preferably with cutouts for the eyes, nose, and / or mouth, as described above) and may, in particular, correspond to an area where the face of an average adult human is relatively flat, while the lobes may occupy an area corresponding to regions extending radially outward from the central portion. Providing the heat transfer unit with lobes on the periphery of the heat transfer unit may facilitate bending of the heat transfer unit in locations corresponding to facial regions that are less flat, in particular in the forehead and chin regions.Lobes can also be provided laterally, in the cheek regions, where there is a transition from the predominantly forward-facing part of the human face to the predominantly lateral-facing parts of the human face. Alternatively, such lateral lobes (e.g., in the cheek regions) are not provided. In this case, the central portion extends across the entire width of the heat transfer unit, and lobes extend from it upwards towards the forehead region and / or downwards towards the chin region.

[0042] The shape of the lobes can be considered somewhat similar to the shape of a flower petal, as in some types of Ranunculus (also known as Buttercup), for example Ranunculus arvensis or Ranunculus repens. In particular, considering each lobe in isolation, only a relatively small portion of its circumference can be connected to the central portion of the heat transfer unit, for example, 10% to 40% of the circumference of each lobe. The remainder of the circumference can be free, i.e., not (permanently) connected to the central portion or to other lobes, so that Petition 870250081032, dated 09 / 09 / 2025, p. 94 / 126 11 / 32 each lobe can be flexed along that part of the lobe's circumference that is connected to (or constitutes the connection to) the central portion, while such flexion substantially does not affect the remainder of the heat transfer unit.

[0043] The lobes are not only connected to the central portion, but are also in fluid communication with it, so that the heat transfer fluid can flow not only through the central portion, but also through the lobes. However, the flow of heat transfer fluid does not necessarily need to occur along the entire length of the interface between the central portion and a lobe. Instead, barriers or compartmentalization lines may be present at the interface between the central portion and a lobe.

[0044] Alternatively, one or more lobes may be connected to the central portion without there also being fluid communication with the central portion.

[0045] In one embodiment, neighboring lobes define a gap between them, in particular where the gap is arranged to be reduced or substantially closed when the heat transfer unit is flexed or bent and applied to a human face. The gap between two lobes may, for example, gradually reduce so that the gap is wider at greater distances from the center of the heat transfer unit than at closer distances. When the heat transfer unit is applied to a human face, the size of the gap may decrease or close completely, depending on the size / shape of the head. It is also possible for two lobes to overlap when the heat transfer unit is applied to a human face.

[0046] In this descriptive report, an expression such as the cheek region of the heat transfer unit or simply the cheek region may be used for simplicity and should be understood as a reference to the region of the heat transfer unit intended to cover the cheek region of a human face (of average size and shape). The same applies, mutatis mutandis, to similar expressions referring to portions of the human face (ear region, chin region, forehead region, etc.). Petition 870250081032, dated 09 / 09 / 2025, page 95 / 126 12 / 32

[0047] In one embodiment, the heat transfer unit further comprises at least one fastening element for temporarily attaching a first lobe to a second lobe or to the central portion. The at least one fastening element may help to keep the heat transfer unit as a whole in contact with the human face. For example, the at least one fastening element may be arranged to extend around the back of the head, from a lobe on one side of the heat transfer unit to a lobe on the other side of the heat transfer unit.

[0048] In addition, or as an alternative, at least one fastening element may be provided to connect (temporarily) one part of the central portion to another part of the central portion, extending again around the (back of the) head.

[0049] In addition, or as an alternative, at least one fastening element may help to keep a specific portion of the heat transfer unit in contact with the human face, particularly (also) in regions where the average human face is curved. To this end, at least one fastening element may extend from one lobe to (or towards) another lobe (e.g., a neighboring lobe) or to the central portion, without extending around the entire contour of the (back of the) head.

[0050] In one embodiment, at least one fastening element is at least partially elastic, in particular wherein at least one fastening element comprises an elastic portion and a substantially non-elastic portion.

[0051] A fastening element that is at least partially elastic can hold the heat transfer unit in more firm contact with the human face. Alternatively, the at least one fastening element can be substantially non-elastic. In either case, the at least one fastening element can be constructed so that its length can be adjusted and can, for that purpose, comprise a buckle or the like.

[0052] In one modality, at least one element of Petition 870250081032, dated 09 / 09 / 2025, pp. 96 / 126 13 / 32 fastening comprises a hook and loop fastener, in particular wherein a hook portion of the hook and loop fastener is arranged to attach (temporarily) to a loop portion permanently attached to the remainder of the heat transfer unit, or wherein a hook portion of the hook and loop fastener is arranged to attach (temporarily) directly to a surface of the heat transfer unit.

[0053] For example, if at least one fastening element comprises an elastic portion and a substantially non-elastic portion, the hook portion may be (permanently) attached to the substantially non-elastic portion, and the elastic portion may be located between the substantially non-elastic portion and the remainder of the heat transfer unit.

[0054] If the heat transfer unit comprises an additional outer layer, such as a fabric layer, the hook portion may (temporarily) be attached directly to that fabric layer, in which case no dedicated loop portion may be required.

[0055] In one embodiment, the heat transfer unit further comprises a third lobe, wherein the third lobe is generally located between the first lobe and the second lobe, wherein at least one fastening element for attaching the first lobe to the second lobe is arranged to extend over the third lobe, thus keeping it in contact with the human face. In this case, the at least one fastening element is not (permanently) attached to the third lobe, nor is it intended to be (temporarily) attached to the third lobe. This can simplify the manufacture of the heat transfer unit when compared to a heat transfer unit that also has a fastening element that is permanently attached to the third lobe or that must be (temporarily) attached to the third lobe. Additionally, it can facilitate the application of the heat transfer unit to a human face.However, since at least one fastening element is arranged to extend over the third earlobe, that same fastening element may also help to keep the third earlobe in contact with the face. Petition 870250081032, dated 09 / 09 / 2025, page 97 / 126 14 / 32

[0056] In one embodiment, the heat transfer unit has a fastening element in each of the forehead and chin regions, as well as one or two fastening elements to extend around the back of the head (or neck), for example, one extending from one ear region to the other ear region and one extending from one (lower) cheek region to the other (lower) cheek region.

[0057] Fasteners other than hook and loop fasteners may be used, for example, fasteners that have an adhesive portion to adhere (temporarily) to another surface.

[0058] Various sizes of heat transfer units can be provided to ensure that a heat transfer unit is available for a relatively wide range of face sizes / shapes, in particular not only for adults but also for (young) children or even infants. However, the inventor anticipates that a single heat transfer unit model will be suitable for the faces of at least 99% of all adults.

[0059] According to a second aspect, the present invention provides a facial cuff assembly comprising: a heat transfer unit, according to the first aspect or any embodiments or variants thereof; and at least one attachment unit, constructed as one or more devices separate from the heat transfer unit, for attaching the heat transfer unit to a human face.

[0060] At least one fastening unit may be constructed in a manner substantially similar to at least one fastening element described above, except that the fastening unit is provided as a separate item from the heat transfer unit, i.e., it is not permanently attached to the heat transfer unit.

[0061] In one embodiment, at least one fastening unit is adjustable, in particular at least partially elastic, and / or

[0062] in which at least one fastening unit is Petition 870250081032, dated 09 / 09 / 2025, pp. 98 / 126 15 / 32 arranged to extend around the human head and heat transfer unit.

[0063] For example, at least one fastening unit may comprise a length-adjustable strap, for example, a strap with a buckle for length adjustment, or it may be a strap comprising elastic material. At least one fastening unit may comprise at least one elastic portion and at least one (substantially) non-elastic portion, or it may be formed entirely of elastic material.At least one attachment unit may extend all the way around the human head (i.e., it may extend over a portion of the heat transfer unit and around the back of the head and thus form a loop) or it may extend mainly around the back of the head and be arranged to be temporarily attached to the heat transfer unit in at least two places, for example, in the cheek or ear regions of the heat transfer unit (without extending over the heat transfer unit from one side to the other).

[0064] According to a third aspect, the present invention provides a heat transfer apparatus comprising: a heat transfer unit, according to the first aspect, or any embodiments or variants thereof, or a face cuff assembly according to the second aspect, or any embodiments or variants thereof;

[0065] a heating or cooling device for heating or cooling a heat transfer fluid; and

[0066] at least one conduit, in particular two conduits, to connect the heat transfer unit to the heating or cooling device to allow the heat transfer fluid to flow between the heating or cooling device and the heat transfer unit.

[0067] The heating or cooling device would normally be significantly larger than the heat transfer unit and could, for example, be a floor-standing device or a device placed in Petition 870250081032, dated 09 / 09 / 2025, p. 99 / 126 16 / 32 a stand or table, for example.

[0068] According to a fourth aspect, the present invention provides a method for heating or cooling a human face, wherein the method comprises:

[0069] to supply a heat transfer unit according to the first aspect or any embodiments or variants thereof or a face cuff assembly according to the second aspect or any embodiments or variants thereof or a heat transfer apparatus according to the third aspect or any embodiments or variants thereof;

[0070] apply the heat transfer unit to a human face; and

[0071] cause a heat transfer fluid to flow into the heat transfer unit, flow through the fluid chamber and flow out of the heat transfer unit.

[0072] The above steps can be performed in the order indicated or in a different order. For example, it is possible to start the fluid flow (i.e., to cause the heat transfer fluid to flow into the heat transfer unit, through the fluid chamber, and out of the heat transfer unit) before applying the heat transfer unit to the face.

[0073] The method of heating or cooling a human face can be used in the context of a therapeutic treatment or, alternatively, for non-therapeutic purposes.

[0074] Additional advantages, features and applications of the present invention are described in the following detailed description and accompanying figures, in which:

[0075] Figure 1 schematically shows a front view of a heat transfer unit in an unfolded condition according to an embodiment of the present invention.

[0076] Figure 2 schematically shows an enlarged cross-sectional view of a portion of the heat transfer unit. Petition 870250081032, dated 09 / 09 / 2025, pages 100 / 126 17 / 32 of Figure 1 along line AA.

[0077] Figure 3 schematically shows a perspective view of a facial cuff assembly applied to a human face / head, according to an embodiment of the present invention.

[0078] Figure 4 schematically shows a front view of a heat transfer unit in an unfolded condition according to an embodiment of the present invention.

[0079] Figure 5 schematically shows a front view of a heat transfer unit in an unfolded condition according to an embodiment of the present invention.

[0080] Figure 6 schematically shows a heat transfer apparatus, according to an embodiment of the present invention.

[0081] Figure 7 shows a flowchart illustrating a method according to an embodiment of the present invention.

[0082] In the figures, identical reference signs are used for the same or similar elements of the embodiments of the invention described herein. To the extent that an element is shown in more than one figure, that element and its function will not necessarily be explained repeatedly.

[0083] Figure 1 schematically shows a front view of a heat transfer unit 1 (for application to a human face) in a substantially flat, unfolded condition, according to an embodiment of the present invention. The heat transfer unit 1 comprises a first and a second layer of material 6, 7, one on top of the other. In use, the first layer of material 6 may, for example, face the human face and will therefore also be called the inner layer 6. The second layer of material 7 may correspondingly face away from the human face and will therefore also be called the outer layer 7. Both layers of material 6 and 7 are made of a flexible and substantially impermeable material, for example, LDPE or polyurethane. As Figure 1 is a front view, the first and the Petition 870250081032, dated 09 / 09 / 2025, pages 101 / 126 18 / 32 second layers of material 6, 7 are not shown separately in Figure 1. The first and second layers of material 6, 7 are shown separately in Figure 2, which schematically shows an enlarged cross-sectional view of a portion of the heat transfer unit 1, along line AA indicated in Figure 1. Reference should be made to both figures.

[0084] The first and second layers of material 6, 7 are connected to each other at their periphery 5, at various connection points 9 and along compartment lines 10, each of which will be described below. To connect the first and second layers of material 6, 7 at these points, the layers of material 6, 7 can, for example, be fused or welded together or glued to each other using an adhesive. In one example, the two layers of material 6, 7 are fused together by applying pressure and radiation (such as heat), whereby connections along the periphery 5, at the connection points 9 and along the compartment lines 10 can be made simultaneously using the same processing apparatus.At different locations on the periphery 5, the connection points 9, and the compartment lines 10, the first and second material layers 6, 7 remain separate and simply lie one on top of the other, forming passages 18 between them, to allow a heat transfer fluid to flow through them. The passages 18 may have different sizes, particularly depending on the distance between the connection points 9, the molten periphery 5, and the compartment lines 10, or substantially the same size, as shown in Figure 2. All the passages together effectively form the fluid chamber 32 bounded by the first and second material layers 6, 7.Although the enlarged cross-sectional view in Figure 2 shows the passages 18 as individual elements, it will become evident in Figure 1 that the passages are (all) connected, given the matrix-like configuration of the individual connection locations 9 – in this respect, it is noted that Figure 1 shows a matrix of connection locations only in a small area of ​​the heat transfer unit 1, as will be described in more detail below.

[0085] It is important to emphasize that periphery 5 shown in Petition 870250081032, dated 09 / 09 / 2025, pp. 102 / 126 19 / 32 Figure 1 is not drawn to scale. Although Figure 1 shows the periphery 5 as a relatively thin line, the inventor envisions the periphery 5 being cast to a width of a few millimeters to ensure a sufficiently tight seal. To form a seal on the periphery, the first and second layers of material 6, 7 can be placed one on top of the other and then connected as described above, so that the first and second layers of material 6, 7 can have the size and shape indicated by the outer edge of the periphery 5, or they can be larger, in which case the first and second layers of material 6, 7 can then be cut to the right size to result in the heat transfer unit 1 with a contour as indicated by the periphery 5.

[0086] The cast periphery 5 is interrupted at one location – in Figure 1 this is shown at a position corresponding to 4 o'clock (12 o'clock being the top point of the figure). This interruption serves as inlet and outlet ports 12, 13. Conduits (not shown in Figure 1, but described below) can be connected to inlet port 12 and outlet port 13 so that heat transfer fluid can be supplied to and removed from the heat transfer unit 1. Several arrows generally indicate the direction of flow of the heat transfer fluid (or a desired fluid path) through the fluid chamber 32 of the heat transfer unit 1.

[0087] The fluid path has several turns or curves, resulting in a sinuous pattern or labyrinthine path. The fluid path is defined primarily by the inner edge of the periphery 5 and by a series of compartment lines 10. Some of the compartment lines 10 are joined to the periphery 5 of the heat transfer unit 1, while others – located more towards the middle of Figure 1 – are not. Some of the compartment lines 10 are branched.

[0088] The compartment lines 10 help ensure that the heat transfer fluid flows substantially across the entire surface of the heat transfer unit 1. The width of each section of the fluid path formed by the compartment lines 10 and the periphery 5 is significantly Petition 870250081032, dated 09 / 09 / 2025, pp. 103 / 126 20 / 32 less than the total width of the heat transfer unit 1.

[0089] Although the inlet and outlet ports 12, 13 are shown at a specific location on the periphery 5, the inlet and outlet ports 12, 13 can also be provided at a different location, either at a different location along the periphery 5 or even within (only) one of the first and second material layers 6, 7 (i.e., not integrated into the periphery 5). Additionally, the arrangement of the compartment lines 10, as shown in Figure 1, is only an example. A different arrangement of compartment lines 10, perhaps with more or fewer compartment lines 10, is also conceivable. Furthermore, the direction of the heat transfer fluid flow along the fluid path can be reversed by using port 13 as the inlet port and port 12 as the outlet port.

[0090] As indicated in Figure 1, the heat transfer unit 1 generally has a central portion 2, as well as several lobes 3a-3e extending from it, generally in a radially outward direction. The central portion 2 is indicated in Figure 1 in several exemplary locations using the reference sign 2. Four cutouts 4 are provided within the central portion 2, respectively for the two eyes, nose, and mouth of a user of the heat transfer unit 1, i.e., the eyes, nose, and mouth are not covered by the heat transfer unit 1 when the heat transfer unit 1 is applied to a user's face. Alternatively, one or more cutouts may be omitted, for example, in the eye and mouth regions, so that only one cutout 4 for the nose remains. The compartment lines 10 would then need to be rearranged appropriately to ensure that the heat transfer fluid flows along a desired path.The first and second layers of material 6, 7 are connected to each other along the edge of the cutouts 4 to ensure that the fluid chamber 32 is also sealed in these regions.

[0091] In the example shown in Figure 1, some compartmentalization lines 10 extend radially outward from the eye and mouth regions 4. Additionally, relatively short compartmentalization lines 10 are Petition 870250081032, dated 09 / 09 / 2025, pp. 104 / 126 21 / 32 provided between the nose region 4 and each eye region 4, as well as between the nose and mouth regions 4 (below the left and right edges of the nose region 4). The first and second layers of material 6, 7 can be connected (e.g., fused together) over the entire area between the nose and mouth regions 4 (the area that includes the philtrum).

[0092] The heat transfer unit 1 shown in Figure 1 has two additional cutouts or openings 19 to secure the heat transfer unit 1 to a human face. This will be described in more detail below.

[0093] In the embodiment shown in Figure 1, five lobes are provided: two lobes 3a, 3b, respectively for the left and right halves of the forehead region, two lobes 3c, 3d, respectively for the left and right cheek and ear regions, as well as one lobe 3e for the chin region. The two lobes 3c, 3d for the cheek and ear regions are significantly larger than the other three lobes 3a, 3b, 3e.

[0094] A gap 8 is formed between each pair of neighboring lobes. At least the three gaps in the forehead region are wider in radially more outward positions than in radially more inward positions. When the heat transfer unit 1 is applied to a human face, the lobes would be flexed in contact with the human face, i.e., the two forehead lobes 3a, 3b would be flexed to follow the shape of the forehead, the cheek / ear lobes 3c, 3d would be curved around the sides of the face, and the chin lobe would be curved to follow the shape of the chin, so that the chin lobe 3e can overlap the lower ends of the side lobes 3c, 3d. As the lobes are flexed, the gaps 8 become narrower than when the heat transfer unit 1 is in the flat condition shown in Figure 1.Depending on the size and shape of the face on which the heat transfer unit 1 is applied, the gaps 8 may close completely, or neighboring lobes may even overlap.

[0095] Although several definitions are possible regarding Petition 870250081032, dated 09 / 09 / 2025, pp. 105 / 126 22 / 32 where the central portion 2 stops and where lobes 3a-3e begin, the central portion 2 can generally be considered as the area in which the indentations 4 are located, as well as an area around the indentations 4 and extending a few centimeters (e.g., about 2 to 3 cm) outward. The central portion 2 can, for example, be considered as an approximately circular or oval region that extends to, but does not include, the gaps 8, i.e., roughly corresponding to the forward-facing region of a human face.

[0096] The inventor has found that satisfactory or good results can be achieved with a heat transfer unit 1 generally shaped as shown in Figure 1. However, in other embodiments, the size and shape of lobes 3a-3e and gaps 8 may differ from those shown in Figure 1. Additionally, other embodiments are possible with more than five lobes (for example, where lobes 3c and 3d are subdivided into two smaller lobes) or with fewer than five lobes (for example, where lobes 3a and 3b are combined into a single forehead lobe).

[0097] In the example shown in Figure 1, lobes 3a-3d are not only joined to the central portion 2, but are also in fluid communication with it, so that the heat transfer fluid can flow not only through the central portion 2, but also through lobes 3a-3d. The chin lobe 3e, however, is not in fluid connection with the central portion 2 - the inventor has found that such fluid connection between the central portion 2 and the chin lobe 3e is not necessary in many cases, since when the cheek lobes 3c, 3d are flexed backward in contact with the lateral portions of the human face, the lower parts of the cheek lobes 3c, 3d tend to meet under the chin, so that heat transfer between the heat transfer unit 1 and the lower chin region is achieved by the cheek lobes 3c, 3d. The chin lobe 3e would normally rest on the lower parts of the cheek lobes 3c, 3d.It is clear that it would also be possible to provide a fluid connection between the central portion 2 and the chin lobe 3e.

[0098] The central portion 2 and lobes 3a-3e are provided Petition 870250081032, dated 09 / 09 / 2025, pages 106 / 126 23 / 32 of connection sites 9, where the first and second material layers 6, 7 are connected to each other. In Figure 1, the connection sites are indicated only in a small portion of the heat transfer unit 1 so as not to obscure other details. However, a corresponding pattern of connection sites 9 may be present throughout the heat transfer unit 1. In the example shown in Figure 1, the three nearest neighbors of connection sites 9 form an equilateral triangle. In other variants, other regular patterns are possible, including a pattern where the four nearest neighbors of connection sites 9 form a square. In other variants, the pattern may be irregular / random. Additionally, different regions of the heat transfer unit 1 may have different patterns of connection sites 9.

[0099] Figure 3 schematically shows a perspective view of a facial cuff assembly 23 applied to a human face / head, according to an embodiment of the present invention.

[0100] In the example shown, the facial cuff assembly 23 comprises a heat transfer unit, such as the heat transfer unit 1 described above (or any of its variants) and one or more fastening units 20, 21, 22, such as bandages or straps 20, 21, 22 to secure the heat transfer unit 1 to the human face / head. In Figure 3, the outline of the human face / head is drawn in a thin continuous line, the outline of the heat transfer unit 1 is drawn in a thick continuous line, a first bandage 20 is indicated by dashed lines, a second bandage 21 is indicated by dashed lines with long strokes, and a strap 22 is indicated by dashed lines with short strokes.

[0101] For clarity, many of the details of the heat transfer unit 1 shown in Figure 1 have been omitted from Figure 3, such as the connection locations 9, the compartment lines 10 and the inlet and outlet ports 12, 13.

[0102] Heat transfer unit 1 is applied to the face so that the eyes, nose and mouth of the face are approximately aligned. Petition 870250081032, dated 09 / 09 / 2025, pages 107 / 126 24 / 32 with the cutouts 4. Lobes 3a-3e are flexed backward to roughly follow the shape of the head. This causes the width of the gaps 8 to decrease or close substantially.

[0103] Bandages and straps 20, 21, 22 may be elastic or adjustable, for example by means of a buckle or similar (not shown), and are indicated by several approximately parallel lines. Bandages 20 and 21 extend over the heat transfer unit 1 to keep it in contact with the face. Bandage 20 extends over the forehead region so as to keep lobes 3a, 3b in place, as well as the upper portion of lobes 3c and 3d. Bandage 20 also extends over the back of the head. Bandage 21 extends over the chin lobe 3e (not shown in Figure 3) and the lower end of lobes 3c (not shown in Figure 3) and 3d. Next, it extends over the cheek and ear areas and around the back of the head, in a higher position than bandage 20. Strip 22 passes through opening 19 and extends around the back of the neck and passes through a corresponding opening 19 on the other side of the neck.

[0104] Bandages 20 and 21 are supplied as separate items from the heat transfer unit 1. Strip 22 can also be supplied as a separate item from the heat transfer unit 1 and, for example, form a loop with a buckle or a hook and loop fastening system to close the loop. Alternatively, strip 22 can be connected (permanently) to the heat transfer unit 1. In this case, one end of strip 22 can pass through an opening 19 and be folded back and secured to an intermediate portion of strip 22, for example, by sewing. The other (free) end of strip 22 can pass through the other opening 19 on the opposite side of the heat transfer unit 1 and be temporarily attached to an intermediate portion of strip 22, for example, with a hook and loop fastening system.In this context, it should be noted that a dedicated ring element can be omitted if the hook element (e.g., permanently attached to the free end of strip 22) can be attached directly to an intermediate portion. Petition 870250081032, dated 09 / 09 / 2025, pp. 108 / 126 25 / 32 of strip 22.

[0105] Figure 4 schematically shows a front view of a heat transfer unit 1 in an unfolded condition according to an embodiment of the present invention. The heat transfer unit 1 shown in Figure 4 corresponds to the heat transfer unit 1 shown in Figures 1 and 3. For clarity, many of the details of the heat transfer unit 1 shown in Figure 1 have again been omitted from Figure 4, such as the connection locations 9 and most of the compartment lines 10. Instead, Figure 4 indicates an approximate possible position of the bandage 21, i.e., it indicates how the bandage 21 may extend over the heat transfer unit 1 when applied to a face.As described above in connection with Figure 3, it is anticipated that lobes 3c and 3d would be flexed in contact with the cheek and ear regions of the face, so that the lower end of lobes 3c and 3d would also come into contact with the chin region, in particular the region under the chin. Lobe 3e would then be flexed backward, overlapping lobes 3c and 3d. When applied to the face, bandage 21 would extend over lobe 3e, then over lobe 3d, then around the back of the head and then over lobe 3c. It should be noted that Figure 4 shows an example of a bandage 21, particularly with regard to its width and position. The position of bandage 21 can be adjusted to result in a firm fit and good contact between the heat transfer unit 1 and the face. Additionally, bandages of different widths can be chosen.

[0106] Figure 4 also shows a portion of an inlet hose 16, which is connected to the inlet port 12 by means of an inlet connector 14. Similarly, Figure 4 shows a portion of an outlet hose 17, which is connected to the outlet port 13 by means of an outlet connector 15. Hoses and connectors suitable for connection to the inlet and outlet ports 12, 13 are known to a person skilled in the art and will therefore not be described in detail. In any case, other inlet and outlet arrangements are possible. The inlet and outlet hoses 16, 17 are for connection to a device Petition 870250081032, dated 09 / 09 / 2025, pages 109 / 126 26 / 32 of heating or cooling, as will be described below.

[0107] In a variant of the embodiment shown in Figure 4, the chin lobe 3e may be omitted. When the heat transfer unit 1 is applied to a face, the lateral lobes 3c and 3d substantially reduce or close the gap 8 in the chin region (or even overlap), and the bandage 21 passes over the lower end of the lobes 3c and 3d to keep them in contact with the chin region, without a chin lobe 3e overlapping the lower end of the lobes 3c and 3d.

[0108] Figure 5 schematically shows a front view of a heat transfer unit in unfolded condition according to an embodiment of the present invention, which can be considered a variant of the embodiment shown in Figure 4. Compared with Figure 4, the bandage 21 shown in Figure 5 does not simply pass over the chin lobe 3e. Instead, the lobe 3e is provided with two additional openings or cutouts 24, and the bandage 21 passes through both openings 24. That is, starting from the left half of the figure, the bandage 21 would pass over the lateral lobe 3c, then over the left portion of the chin lobe 3e, then through the left opening 24, then pass behind the central portion of the lobe 3e, then through the right opening 24, then over the right portion of the lobe 3e and then over the lateral lobe 3d. Furthermore, bandage 21 can be passed around the back of the head in the same way as explained above in connection with Figure 4.

[0109] Figure 5 indicates an additional variant. This variant has two additional openings or cutouts 25 (shown in Figure 5 as dashed lines) near the upper end of the side lobes 3c, 3d. In this variant, the bandage 21 would extend over the heat transfer unit 1, as described above, except that, near the upper end of the side lobes 3c, 3d, the bandage 21 would pass through the openings or cutouts 25 and then extend behind the upper end of the side lobes 3c, 3d.

[0110] It will be appreciated that openings 24 and / or 25 may help to better locate bandage 21 in relation to the transfer unit of Petition 870250081032, dated 09 / 09 / 2025, pages 110 / 126 27 / 32 heat 1 and can therefore hold the heat transfer unit 1 more firmly in place when applied to a human face.

[0111] Figure 6 schematically shows a heat transfer apparatus 30 according to an embodiment of the present invention. The heat transfer apparatus 30 comprises a heat transfer unit 1, a heating or cooling device 31 for heating or cooling a heat transfer fluid, and connecting hoses 16, 17 between the heating or cooling device 31 and the heat transfer unit 1, in particular an inlet hose 16 and an outlet hose 17, respectively, to allow the heat transfer fluid to flow into and out of the heat transfer unit 1. The heating or cooling device 31 is not shown to scale – it would normally be significantly larger than the heat transfer unit 1. Similarly, the hoses 16, 17 would normally be significantly longer than the width of the heat transfer unit 1.

[0112] The heat transfer unit 1 to be used in conjunction with the heating or cooling device 31 and hoses 16, 17 may be any of those described above or, alternatively, as the heat transfer unit 1 illustrated schematically in Figure 6. Instead of being provided with bandages or strips 20, 21, 22, which are items entirely separate from the heat transfer unit 1 and / or which pass through openings / cutouts of the heat transfer unit 1, the heat transfer unit 1 of Figure 6 has several strips 26a-26d, which are substantially permanently attached to the heat transfer unit 1, for example, sewn into the heat transfer unit 1.In the example shown in Figure 6, four of these strips 26a-26d are provided: strip 26a is attached to the upper end of the lateral lobe 3d, strip 26b is attached to the ear region of the lateral lobe 3d, strip 26c is attached to the lower cheek region of the lateral lobe 3d, and strip 26d is attached to the lower end of the lateral lobe 3d, in the chin region. The attached ends 27a-27d of the strips 26a-26d, that is, the ends of the strips 26a-26d that are permanently attached. Petition 870250081032, dated 09 / 09 / 2025, pages 111 / 126 28 / 32 attached to the heat transfer unit 1, can, for example, be sewn directly onto the molten periphery 5 of the heat transfer unit 1. Another way of attaching the strips 26a-26d involves the heat transfer unit 1 having at least one additional layer, for example, an outer fabric layer (not shown), onto which the strips 26a-26d are sewn.

[0113] The free ends 28a-28d of the strips 26a-26d are intended to be temporarily attached to a portion of the heat transfer unit 1, for example, where indicated by the four rectangles 29a-29d. For this purpose, a hook and loop fastening system may be used. For example, the free ends 28a-28d may be provided with a hook element (for example, sewn onto the strips 26a-26d), and a loop element may be provided, approximately where indicated by the four rectangles 29a-29d, in particular substantially permanently attached to it, for example, by sewing loop elements 29a-29d onto an outer fabric layer of the heat transfer unit 1, or by attaching loop elements 29a-29d directly to the outer layer 7, for example, using an adhesive.

[0114] When heat transfer unit 1 is applied to a face, lobes 3a-3e are first flexed into contact with the forehead, ear, cheek, and chin regions, respectively. The free ends 28a-28d of strips 26a-26d are then attached to ring elements 29a-29d: strip 26a is applied over lobes 3a and 3b and partially over the upper end of lobe 3c, with hook element 28a attached to ring element 29a. Strip 26d is applied partially over the lower end of lobe 3c, with hook element 28d attached to ring element 29d. The strap 26b extends around the back of the user's head and partially over the earlobe region 3c, with the hook element 28b attached to the ring element 29b. In this context, it is observed that the strap 26b would be significantly longer than that shown in Figure 6.In particular, given that the 26b strap would need to extend around the back of the user's head, the 26b strap would typically be longer than the other straps 26a, 26c, and 26d. The 26c strap extends around the... Petition 870250081032, dated 09 / 09 / 2025, pp. 112 / 126 29 / 32 upper end of the user's neck and partially over the cheek region of lobe 3c, with hook element 28c attached to ring element 29c.

[0115] It is worth noting that strip 26a can keep the forehead lobes 3a and 3b in contact with the forehead without the lobes 3a and 3b themselves being provided with a fastener, since strip 26a extends over lobes 3a and 3b when strip 26a is attached to the upper end of lobe 3c, where indicated by the reference number 29a.

[0116] Although a specific modality has been illustrated in Figure 6, it should be noted that a number of variations are possible:

[0117] 1. Instead of the 26a-26d straps being provided with 28a-28d hook elements and 29a-29d ring elements being provided in the 3c side lobe, the positions of some or all of the hook and ring elements may be swapped so that the hook elements are provided in the 3c side lobe, with ring elements being provided in the 26a-26d straps.

[0118] 2. Instead of loop elements being provided (on side lobe 3c or on straps 26a-26d), any hook element provided may also be attached directly to side lobe 3c or on straps 26a-26d, provided they are of a suitable material or covered with a suitable material (e.g., fabric).

[0119] 3. Instead of the hook and loop fastening system, the 26a-26d strips can be temporarily applied to the 3c side lobe in some other way, for example, using a (temporary) adhesive.

[0120] 4. Some or all of the 26a-26d strips can be attached (permanently) to side lobe 3c, to be temporarily attached to side lobe 3d.

[0121] 5. As described in connection with strip 22 (cf. Figure 3), strips 26a-26d may be elastic or at least partially elastic. For example, a region at one or both ends of strips 26a-26d (i.e., where indicated by reference signs 27a-27d and / or 28a-28d) may be Petition 870250081032, dated 09 / 09 / 2025, pp. 113 / 126 30 / 32 is substantially inelastic, with the remaining portion of strips 26a-26d being made of an elastic material.

[0122] 6. Any, some or all of the 26a-26d straps may be adjustable in length and, for this purpose, may be provided with a buckle or similar.

[0123] More generally, individual features of the modalities described can be used in other combinations. For example, a bandage 20 (cf. Figures 3 to 5) could be used instead of strips 26a and 26b to keep the heat transfer unit 1 in contact with the forehead and ear regions, while strips 26c and 26d (cf. Figure 6) are used to keep the heat transfer unit 1 in contact with the cheek and chin regions.

[0124] Figure 7 shows a flowchart illustrating a method according to an embodiment of the present invention. After the beginning 40 of the method, a heat transfer unit (such as the heat transfer unit 1 described above), a facial cuff assembly (such as the facial cuff assembly 23 described above and comprising a heat transfer unit) or a heat transfer apparatus (such as the heat transfer apparatus 30 described above and comprising a heat transfer unit) is provided in step 41. In step 42, the heat transfer unit is applied to a human face in the manner described above. In step 43, a heat transfer fluid is made to flow into the heat transfer unit, flow through the fluid chamber and flow out of the heat transfer unit. After that, the method can end (step 44).The method can be used for therapeutic purposes or exclusively for non-therapeutic purposes.

[0125] Although at least one embodiment of the present invention has been described above, it should be noted that there are a large number of variations thereof. Additionally, it should be understood that the embodiments described are merely non-limiting examples of how the present invention can be implemented and that it is not intended to limit the scope. Petition 870250081032, dated 09 / 09 / 2025, pp. 114 / 126 31 / 32 the application or configuration of the apparatus and methods described in this document. Instead, the preceding description will provide the person skilled in the art with instructions for implementing at least one embodiment of the invention, it being understood that various changes in the functionality and arrangement of the elements of the embodiment may be made without departing from the subject matter defined by the appended claims and their legal equivalents. LIST OF REFERENCE SIGNS

[0126] 1 heat transfer unit

[0127] 2 central portion

[0128] 3a-3e lobules

[0129] 4 clippings

[0130] 5 periphery / fused portion

[0131] 6 first layer of material

[0132] 7 second layer of material

[0133] 8 gap

[0134] 9 connection points (welding / fusion)

[0135] 10 compartment lines, lines (welding / fusion)

[0136] 12 entrance door

[0137] 13 exit door

[0138] 14 input connector

[0139] 15 output connector

[0140] 16 inlet hose

[0141] 17 outlet hose

[0142] 18 passages

[0143] 19 opening / cut

[0144] 20-22 bandages / strips

[0145] 23 face cuff set

[0146] 24, 25 opening / clipping

[0147] 26a-26d strip Petition 870250081032, dated 09 / 09 / 2025, pages 115 / 126 32 / 32

[0148] 27a-27d fixed end of the strip

[0149] 28a-28d free end of the strip / hook element

[0150] 29a-29d loop element

[0151] 30 heat transfer apparatus

[0152] 31 heating or cooling device

[0153] 40-44 steps of the method

Claims

1. A heat transfer unit adapted for application to a human face to transfer heat to / from the human face, characterized in that the heat transfer unit comprises a first layer of flexible material and a second layer of flexible material defining a fluid chamber between them, allowing a heat transfer fluid to flow through the fluid chamber, wherein the first and second layers of flexible material are connected to each other at a plurality of connection points, wherein the heat transfer unit is sized so that, when applied to a human face, it can cover at least 70% of the surface of the human face.

2. Heat transfer unit according to claim 1, characterized in that the heat transfer unit is dimensioned so that, when applied to a human face, it can cover at least 75%, 80%, 85% or 90% of the surface of the human face.

3. Heat transfer unit, according to claim 1 or 2, characterized in that the heat transfer unit is sufficiently flexible so that, when applied to a human face, it can be in direct contact with at least 65%, 70%, 75%, 80%, 85% or 90% of the surface of the human face.

4. Heat transfer unit, according to any one of claims 1 to 3, characterized in that the heat transfer unit has one or more cutouts for one or more of: - one or both eyes - a nose - a mouth.

5. Heat transfer unit, according to any one of claims 1 to 4, characterized in that the heat transfer unit comprises an inlet port and an outlet port for connection to a heating or cooling device to allow heat transfer fluid to flow between the heating or cooling device and the heat transfer unit.

6. Heat transfer unit, according to any one of claims 1 to 5, characterized in that the heat transfer unit comprises compartmentalization lines, in particular welding lines or fusion lines, for compartmentalizing the fluid chamber, in particular for guiding the heat transfer fluid along a desired path through the fluid chamber.

7. Heat transfer unit according to claim 6, characterized in that the desired path has multiple curves or turns, in particular in that the desired path is a labyrinthine path.

8. Heat transfer unit, according to any one of claims 1 to 7, characterized in that the heat transfer unit is arranged to be transferred from a substantially flat condition to a flexed or bent condition when applied to a human face.

9. Heat transfer unit, according to any one of claims 1 to 8, characterized in that the heat transfer unit comprises a central portion and a plurality of lobes connected to the central portion.

10. Heat transfer unit according to claim 9, characterized in that the adjacent lobes define a gap between them, in particular in that the gap is arranged to be reduced or substantially closed when the heat transfer unit is flexed or bent and applied to a human face.

11. Heat transfer unit, according to claim 9 or 10, characterized by further comprising at least one fastening element for temporarily attaching a first lobe to a second lobe or to the central portion.

12. Heat transfer unit, according to claim 11, characterized in that at least one fastening element is at least partially elastic, in particular in that the at least one fastening element comprises an elastic portion and a substantially non-elastic portion.

13. Heat transfer unit according to claim 11 or 12, characterized in that at least one fastening element comprises a hook and loop fastener, in particular wherein a hook portion of the hook and loop fastener is arranged to attach to a loop portion permanently attached to the remainder of the heat transfer unit, or wherein a hook portion of the hook and loop fastener is arranged to attach directly to a surface of the heat transfer unit.

14. Heat transfer unit, according to any one of claims 11 to 13, characterized in that the heat transfer unit further comprises a third lobe, wherein the third lobe is generally located between the first lobe and the second lobe, wherein at least one fastening element for securing the first lobe to the second lobe is arranged to extend over the third lobe, thus keeping it in contact with the human face.

15. Facial cuff assembly, characterized by comprising: a heat transfer unit, as defined in any one of claims 1 to 14; and at least one fixation unit, constructed as one or more devices separate from the heat transfer unit, for fixing the heat transfer unit to a human face.

16. Facial cuff assembly, according to claim 15, characterized in that at least one fastening unit is adjustable, in particular at least partially elastic, and / or in that at least one fastening unit is arranged to extend around the human head and the heat transfer unit.

17. Heat transfer apparatus, characterized by Petition 870250081032, dated 09 / 09 / 2025, page 119 / 126 4 / 4 comprising: a heat transfer unit, as defined in any one of claims 1 to 14, or a face cuff assembly, as defined in claim 15 or 16; a heating or cooling device for heating or cooling a heat transfer fluid; and at least one conduit, in particular two conduits, for connecting the heat transfer unit to the heating or cooling device to allow the heat transfer fluid to flow between the heating or cooling device and the heat transfer unit.

18. Method for heating or cooling a human face, characterized by the method comprising: providing a heat transfer unit, as defined in any one of claims 1 to 14, or a facial cuff assembly, as defined in claim 15 or 16, or a heat transfer apparatus, as defined in claim 17; applying the heat transfer unit to a human face; and causing a heat transfer fluid to flow into the heat transfer unit, flow through the fluid chamber, and flow out of the heat transfer unit.

Images