Cooling device, in particular a portable cooling device, in particular for medical, therapeutic or aesthetic applications

Abstract

The invention relates to a cooling device (1) for cooling the surface of an element, in particular an element of the human body, such as a part of the skin of a human being, the device comprising: - a base body (2) defining at least one cavity (3) designed to accommodate a ball (4); - a ball (4) made of thermally conductive material, particularly steel, accommodated in the cavity (3), the ball (4) being held in the cavity so as to be able to rotate on itself, and at least one portion of the outer surface of the ball projects out of the cavity and is capable of being brought into contact with the surface to be cooled; and - cooling means for maintaining the ball at a low temperature, the cooling means being arranged in the base body so as to extend at least partially laterally with respect to the ball.

Description

Description Title of the invention: Cooling device, in particular portable, especially for medical, therapeutic or aesthetic applications.

[0001] [The present invention relates to a cooling device, in particular portable, in particular for medical, therapeutic or aesthetic applications, intended to apply cold to a surface, in particular the skin of a living being, in particular a human being.

[0002] The present invention also relates to a device for applying a product to a surface, in particular the skin of a living being, in particular a human being, comprising a cooling device and at least one reservoir of the product, in particular topical, in fluid form, in particular liquid or gel, intended to be applied to the surface.

[0003] Existing cooling devices are often bulky and difficult to transport. Ice packs are an example of a traditional cooling system used to relieve pain and inflammation, but they are heavy and require a power source. Other existing devices incorporate ice packs and / or cooling gels, but these products are not designed for continuous use and heat up quickly. Cryolipolysis machines are also known; they are bulky, expensive, and require special operating precautions, making them suitable for professional use only.

[0004] From EP1797847, a device for applying a product to the skin is known, comprising a container holding a cosmetic or dermatological composition and an applicator having an application surface made of a thermally conductive material, the applicator and the container being received in a single package. In the case where the device includes a rotating ball, the ball can be cooled by a eutectic liquid contained in a cavity inside the ball. Furthermore, the rotating ball does not come into direct contact with the skin; an intermediate element encloses the ball, remaining at distance from it and creates the contact interface with the user's skin of the device.

[0005] From FR2981639, a device is known for applying either a product or cold to a part of a human skin, comprising a basic body defining at least one housing designed to receive a ball, and a metallic ball received in the housing, the ball being held in the housing so as to be able to rotate on itself, and at least a part of the outer surface of the ball protruding out of the housing and able to be brought into contact with the surface of the user's skin.The device further comprises a container arranged axially under the ball and containing either a refrigerant gas or a topical product to be applied, the outlet of the container being in communication with a lower part of the surface of the ball, and there is provided an actuation ring which, under the action of the user, triggers the projection of either the product or the gas, to be applied to the surface of the ball, which then, by rolling, applies it to the skin of the user.

[0006] From US2012 / 0109041 A1, a device for applying a substance to the user's skin via a sphere is known. In one embodiment, the substance is contained within the porous sphere itself, the device comprising a chamber for activating the substance by means of cold or heat, the activation chamber being arranged adjacent to the sphere. In another embodiment, the substance is stored in a compartment surrounding a portion of the sphere, and the activation chamber acts to activate the substance, which can then be drawn up by the sphere for application to the user's skin. However, in both cases, this device does not allow the application of cold via the sphere, which, moreover, is not made of a material with good thermal conductivity.

[0007] The present invention aims to overcome the drawbacks of the prior art by providing a cooling device that is simple to manufacture and transport and that can have a long autonomy.

[0008] According to a first aspect of the invention, a cooling device intended to cool the surface of an element, in particular an element of the human body, for example a part of the skin of a human being, is as defined in claim 1.

[0009] Preferably, the ball is solid, that is to say, not hollow, in particular does not have a cavity within it.

[0010] According to a preferred embodiment, the cooling device includes cooling means for maintaining the ball at a temperature below 10°C, preferably below 5°C, even more preferably below 0°C, in particular at a temperature between -20°C and 0°C for a prolonged time, in particular more than 1 hour, preferably more than 2 hours.

[0011] In particular, the cooling means are arranged in thermal communication with the part of the outer surface of the ball that does not protrude out of the housing.

[0012] Preferably, the cooling means are arranged in thermal communication with the entire part of the outer surface of the ball that does not protrude out of the housing.

[0013] In particular, the cooling means consist of at least one refrigerant block formed of a sealed casing, preferably sufficiently rigid to stand on its own, defining a sealed compartment filled with a fluid having a low temperature.

[0014] According to a favorable embodiment, at least one refrigerant block is arranged inside the basic body so as to be in direct contact with the ball, in particular by defining the housing in which the ball is received.

[0015] Preferably, thermal insulation, such as a sheet of insulating material, is provided around the cooling elements. This allows the device to be handled by hand at the cooling elements. Furthermore, the device's operating time is increased.

[0016] Preferably, the device includes a removable upper cap covering at least the part of the ball protruding out of the housing.

[0017] Preferably, an auxiliary cooling block is housed in the stopper, specifically positioned to be in contact with the surface of the protruding ball. the outside of the housing, in particular with the entire surface of the ball protruding outside the housing.

[0018] Preferably, a magnet is incorporated into the top cap, in particular by being fixed to it, so as to interact with the metal ball to ensure the removable closure of the cap.

[0019] Preferably, the fluid contained in the compartment(s) is in the form of a liquid or a gel, preferably a so-called eutectic liquid or gel, that is to say having a melting (or freezing) temperature lower than other liquids having the same chemical composition.

[0020] These so-called eutectic liquids and / or gels are often used as cold packs for storing and transporting temperature-sensitive products and are generally composed of water, a gelling agent (such as sodium polyacrylate or cellulose), and specific salts or alcohols that lower the melting point. This type of liquid or gel is particularly well-suited to cooling applications because it can maintain a constant temperature for a relatively long period of time, for example, more than one hour, especially more than two hours, particularly within a temperature range of -5°C to -20°C.

[0021] Another aspect of the invention relates to a device for applying a product to a surface, in particular the skin of a living being, in particular a human being, comprising: - a cooling device intended to cool the surface of an element, in particular an element of the human body, for example a part of a human being's skin, comprising: - a basic body defining at least one housing designed to receive a ball; - a ball made of thermally conductive material, in particular steel, received in the housing, the ball being held in the housing so as to be able to rotate on itself, and at least part of the outer surface of the ball protruding out of the housing and able to be brought into contact with the surface to be cooled; - cooling means intended to maintain the ball at a low temperature, in particular below 0°C, in particular between -20°C and 0°C for a prolonged period, in particular exceeding 1 hour, preferably exceeding 2 hours; and - a reservoir of a product, in particular topical, in fluid form, in particular liquid or gel, intended to be deposited on the surface to be cooled by the ball, the reservoir being fixed, in particular in a removable manner, to the cooling device so as to have an opening facing the ball so as to allow contact of at least part of the ball with the product contained in the reservoir.

[0022] The present invention also relates to the use of a cooling device and / or a device for applying a product according to the invention for cryolipolysis or cryotherapy.

[0023] The present invention also relates to an assembly comprising a sarcophagus defining an interior space and a device according to the invention received in the interior space of the sarcophagus, the sarcophagus further comprising sarcophagus cooling means intended to maintain the temperature of the interior space of the sarcophagus at the same temperature as that corresponding to the cooling means of the device received in the sarcophagus, in particular one or more blocks of eutectic liquid identical to that of the cooling means of the device.

[0024] Thus, when the cooling device and the sarcophagus are placed in a freezer / refrigerator with a temperature lower than that corresponding to the eutectic liquid of the sarcophagus and the cooling device, the ball, in use, after being removed from the freezer, will have a temperature suitable for contact with the user's skin, in particular a temperature between -8°C and -10°C appropriate for cryolipolysis, corresponding to that of the eutectic liquid of the cooling device, and not that of the freezer (classically at -18°C or less), too low for contact with the skin.

[0025] By way of example only, a preferred embodiment of the invention is described below with reference to the drawings, in which:

[0026] Figure 1 is a longitudinal cross-sectional view of an embodiment of a cooling and / or product application device according to the invention;

[0027] Figure 2 is an exploded view of the different parts forming the device of Figure 1;

[0028] Figure 3 is a longitudinal cross-sectional view of another embodiment of a cooling and / or product application device according to the invention;

[0029] Figure 4 is an exploded perspective view of the embodiment of Figure 3;

[0030] Figure 5 is an identical view to that of Figure 3 with an indication of the dimensions in millimeters of the device;

[0031] Figure 6 is a front view of an embodiment of a device according to the invention comprising a temperature sensor and means for displaying the temperature;

[0032] Figure 7 is a cross-sectional view of the device in Figure 6;

[0033] Figure 8 is a cross-sectional view of an embodiment of an assembly according to the invention comprising the cooling device of Figures 9 and 10 and a sarcophagus-forming element in which the cooling device is received;

[0034] Figure 9 is a perspective view of the assembly shown in Figure 8; and

[0035] Figure 10 is a cross-sectional view of an upper part of another embodiment of a device according to the invention.

[0036] In the figures, a cooling device 1 comprises a basic body 2 of circular cylindrical shape which defines within it a housing 3 of substantially hemispherical shape into which a ball 4 made of a material with a high thermal coefficient, for example stainless steel, glass, ceramic (in particular zirconium oxide) or similar material, is received by snap-fit. The basic body 2 further defines within it a toroidal chamber 40 open at the bottom; the toroidal chamber 40 extends around the ball in the latitude range between a few degrees north (from 1° to 10° beyond the center of the ball) and 90° south (corresponding to the pole of the ball located at the bottom of the housing).

[0037] The ball 4 is received in the housing 3 by complementary shape, so that it can rotate on itself, with an upper part protruding outside the housing, the shape of the housing being hemispherical, but with an angle slightly greater than 0° north latitude (for example between 1° and 20°, in particular between 5° and 10°), so that the center C of the ball is below the upper peripheral edge of the housing, thus preventing the ball from coming out of the housing, the ball being able, during manufacture, to be forced into the housing, by the relative flexibility of the material forming the housing 3.

[0038] A bottle-shaped reservoir 5 has a threaded neck 6 which screws into a threaded conduit 17 coming from the lower part of the housing 3. The housing 3 has, in its bottom part, an opening 8, corresponding to the neck 6, so that the product contained in the reservoir 5 and intended to be deposited on the surface to be cooled by the ball 4 can come into contact with the ball 4 when the latter is received in the housing 3.

[0039] A removable upper cap 9 covers the base body 2 from above, the cap being screwed in by means of an internal tapped hole 30 into a thread 31 coming from the outer side face of the base body 2. The cap covers in particular the upper surface of the ball which protrudes from the housing 7 and which is intended to be rolled over the surface to be cooled, in particular the skin of a human being, possibly with simultaneous application of the product stored in the reservoir 5 and picked up by the ball as it rolls in the housing 7 at the part of its surface which is opposite the lower opening 8, itself arranged opposite the opening of the neck 6.

[0040] On the other hand, the device includes cooling means comprising a cooling block 10 having a sealed, toroidal casing 11. These cooling means are housed in the toroidal chamber 40, which thus forms a cooling chamber. The cooling means then substantially surround the portion of the ball received in the housing 3. Thus, the cooling means extend partially to the same level (height) as the ball, laterally relative to it. The casing 11 defines a sealed compartment into which a fluid is received, in particular a liquid L, preferably a eutectic liquid, that is to say, a liquid having a melting point lower than Other liquids with the same chemical composition are often used as cold packs for storing and transporting temperature-sensitive products. These liquids (or eutectic gels) are generally composed of water, a gelling agent (such as sodium polyacrylate or cellulose), and specific salts or alcohols that lower the melting point. This type of liquid is well-suited for cooling applications because it can maintain a constant temperature for a relatively long period, particularly in the temperature range of -5°C to -20°C.

[0041] The casing 11 can be made of various materials with good heat / cold conductivity, such as plastic, glass or metal, particularly High Density Polyethylene (HDPE). The casing 11 forms a so-called solid element, that is to say, one which maintains its shape by itself.

[0042] Preferably, the portion of the body forming the ball-receiving housing 3 is made of a material that is a good conductor of heat / cold so that the ball and the block 10 are in thermal communication with each other. Alternatively, as shown in the figures, through-windows 18 can be provided, notably distributed uniformly along the periphery of the housing to further improve heat transfer between the block 10 and the ball 4 through the wall of the housing 3.

[0043] On the other hand, the rest of the basic body, and in particular its side casing and the cap, is preferably made of a thermally insulating material, for example Polypropylene (PP).

[0044] According to another possible embodiment, the envelope 11 is rigid so as to hold itself together and is arranged, in particular fixed, in the basic body 2 so as to define itself the housing for receiving the ball.

[0045] The cooling means may further include an auxiliary cooling block 20 housed inside the cap. The auxiliary block 20 has a sealed casing 21 substantially surrounding the portion of the ball protruding from the housing 3, i.e., the surface of the ball extending in the latitude range between 90° north and approximately 10° north, so that the ball is substantially surrounded over its entire surface by cooling means. The main and auxiliary cooling systems, when the cap is in place, keep the ball cold, and expose the ball when the cap is removed. The casing 21 defines a sealed compartment into which a fluid is received, in particular a liquid of the same kind as the liquid L of the casing 11, in particular the same liquid L.

[0046] In particular, the two casings 11 and 21 are secured by snapping a respective peripheral rib 12, 22 into a respective groove 13, 23 formed respectively in the inner wall of the base body and in that of the cap. According to other possible embodiments, the two casings can be secured using clips, screws, seals, suction cups, or any other suitable fastening means, allowing the user to replace the block(s) quickly and easily, especially when they have become hot. However, without departing from the scope of the present invention, the block(s) may be provided for to be fixed in a non-removable manner.

[0047] The device consists of at least two parts: an upper part containing the cooled compartment with the coolant and the rotating ball (and, where applicable, the cap), and a lower part containing the reservoir for the topical product and the topical liquid P to be applied to the skin. These two parts are independent of each other, preventing the topical product from freezing when the part containing the coolant L and the rotating ball cools down, for example, when this upper part of the device is placed in a freezer, particularly after being placed in a sarcophagus as described later. Once this upper part has reached the desired temperature, it is then connected to the lower part before use by screwing the threaded neck into the threaded channel.

[0048] The liquid, preferably eutectic, is pre-cooled, for example, by placing the compartment in a freezer for an appropriate period of time to reach the desired temperature, in particular below 0°C, preferably between -20°C and 0°C.

[0049] Figures 3 and 4 show another embodiment of the invention. The cooling device T comprises a basic body 2' of the shape A circular cylindrical body defines within it a housing 3' of substantially hemispherical shape into which a ball 4' made of a material with a high thermal coefficient, for example stainless steel, glass, ceramic (particularly zirconium oxide) or similar material, is received by snap-fitting. The base body 2' further defines within it a toroidal chamber 40' open at the bottom, the toroidal chamber 40' extending around the ball in the latitude range between B° north (beyond the center of the ball) and 90° south (corresponding to the pole of the ball located at the bottom of the housing), the latitude angle B° north being between 1° and 10°.

[0050] The opening in the bottom of the toroidal chamber 40' is closed by a perforated disc-shaped plug 41'. Eutectic liquid L is stored in the toroidal chamber 40', which is closed by the plug 40'.

[0051] The ball 4' is received in the housing 3' by complementary shape, so that it can rotate on itself, with an upper part protruding outside the housing, the shape of the housing being hemispherical, but with an angle A slightly greater than 0° of north latitude (for example between 5° and 20°, in particular between 10° and 15°), so that the center C of the ball is below the upper peripheral edge 42' of the housing, thus preventing the ball from coming out of the housing, the ball being able, during manufacture, to be inserted by force into the housing, by the relative flexibility of the material forming the basic body 2'.

[0052] A bottle-shaped reservoir 5' has a threaded neck 6' which screws into a threaded lower end of a conduit 17' coming from the lower part of the housing 3. The housing 3 has, in its bottom part, an opening 8' which opens into the conduit 17', opposite the neck 6', so that the product contained in the reservoir 5' and intended to be deposited on the surface to be cooled by the ball 4' can come into contact with the ball 4' received in the housing 3'.

[0053] A 9" cap covers the top of the 2" base body, the cap being screwed in through an internal 30" thread into a 3T thread originating from the outer side face of the base body. The cap specifically covers the upper surface of the ball that protrudes from its housing and is intended to be rolled over the surface to be cooled, such as human skin. it possibly with simultaneous application of the product stored in the reservoir 5' and taken up by the ball during its rolling in the housing 7' at the level of the part of its surface which is opposite the lower opening 8', itself arranged opposite the opening of the neck 6'.

[0054] The device includes cooling means, in the form of the eutectic liquid L received in the toroidal chamber 40', which thus forms a cooling chamber. The eutectic liquid then substantially surrounds the portion of the ball received in the housing 3'.

[0055] Preferably, the basic 2' body can be made of various materials that are good conductors of heat / cold, such as plastic, glass or metal, especially High Density Polyethylene (HDPE).

[0056] On the other hand, there is a planned outer 50' envelope which is positioned substantially around the 2' base body, and in particular at the level of the 40' chamber containing the eutectic liquid, and which is preferably made of a thermally insulating material, for example Polypropylene (PP).

[0057] The cooling means further include an auxiliary cooling chamber 20' housed inside the upper plug 9'. The chamber 20' contains eutectic liquid L and substantially surrounds the portion of the ball protruding from the housing 3', that is, the surface of the ball extending in the latitude range between 90° north and approximately 10° north, so that the ball is substantially surrounded over its entire surface by primary and auxiliary cooling means when the plug is in place, thus keeping it cool, and leaving the ball exposed when the plug is removed. The auxiliary chamber 20' has a top opening closed by a plug 42'.

[0058] The present invention can be implemented in any application requiring the application of intense cold to a surface, particularly to the skin of a living being, especially a human being, particularly in the context of cryotherapy or any other treatments requiring prolonged cold massage on the body, for example in cryolipolysis to reduce fat deposits in the areas to be treated, such as the abdomen, thighs, or arms, as well as to combat or treat varicose veins. The low temperature of the The outer surface of the ball, maintained for a prolonged time by the cooling liquid, causes the crystallization of fat cells, which are then naturally eliminated by the body.

[0059] In addition to its use in classic cryolipolysis as described above, the cooling system of the present invention can also be used in highly localized cryolipolysis on smaller areas, in particular to eliminate under-eye bags, especially those made up mainly of fat.

[0060] It can also be used for cryotherapy, particularly for treating blows, hematomas, rheumatism and similar conditions.

[0061] In this case, the rotating sphere can be adapted in size to the small area to be treated (from a few centimeters in diameter to several tens of centimeters for larger cases) and used for a duration generally of 20 to 30 minutes at constant sub-zero temperatures. This under-eye area naturally offers two advantages for cryolipolysis application with a rotating sphere: the shape of the bags, which are essentially fatty bulges, eliminates the need to pinch or suction the fat area to concentrate it, as is the case in conventional cryolipolysis and would be very dangerous in this area; and the specific composition of the skin in this part of the body, which is very thin and therefore allows for easier access to the fat cells.

[0062] The rotating ball as described in the present invention can also be used against blows received, migraines, rheumatism or osteoarthritis to help reduce inflammation and pain.

[0063] The rotating ball device according to the invention is simple to use, easy to transport, lightweight, and does not require a power source. It can be used for applying cosmetic, medical, or therapeutic products to the skin.

[0064] In the present invention, thermally conductive means a material having a thermal conductivity greater than or equal to 1 Wm -1 K' 1 , preferably greater than or equal to 40 Wm -1 K' 1 , even more preferably above 180 WOT 1 K' 1 .

[0065] Preferably, the thermally conductive material according to the invention also exhibits a thermal inertia of at least 1000 Jrrr2 K' 1 s' 1 / 2 , preferably at least 5,000 Jrrr 2 K' 1 s' 1 / 2 , even more preferably of at least 10,000 dm -2 K' 1 s' 1 / 2 , even more preferably at least 20,000 Jrrr 2 K' 1 s' 1 / 2 .

[0066] Following a favorable improvement, it may be provided means forming a sensor capable of detecting the temperature of the ball 4 or 4' and means for displaying data related to the temperature detected by the means forming a sensor.

[0067] Thus, according to one embodiment, as shown in figures 1 to 5, the ball can be covered with a layer of thermochromic material, the layer changing color, for example from green to red, when the temperature of the ball becomes greater than 0°C.

[0068] Figures 6 and 7 show a device 1” substantially identical to that of Figures 3 to 5, in which the sensor means consist of a probe wire 500 and the display means consist of an LED screen 501 received in a recess formed in the outer lateral casing 51”, so as to be visible from outside the device. The probe wire 500 extends from the LED screen 501 until it is flush with the inner surface of the housing 3”, so as to be in thermal contact with the ball 4”. The probe wire 500 extends vertically in a channel 502 formed in the cooling chamber 40”. Thus, the cooling chamber 40”, unlike the chamber 40” in the embodiment shown in Figures 3 to 5, is not perfectly toroidal, having a smaller radius on part of its circular periphery (on the order of a few degrees) to allow the formation of the vertical channel 502 and thus the passage of the probe wire towards the ball.

[0069] Figure 10 shows the upper part of another embodiment of a device according to the invention. The main difference, besides slightly different geometric shapes, lies in the presence of a magnet 606 fixed (by gluing, clipping, or similar means) to the upper cap so as to achieve the removable closure of the upper cap by magnetic attraction between the 4" metal ball and the magnet. Furthermore, no auxiliary cooling block is incorporated in the removable upper cap covering the ball. Of course, one or more auxiliary cooling blocks could be incorporated in this upper cap, as is the case in the other embodiments of implementation. Similarly, in these other embodiments, it would be possible to incorporate a magnet like that 606 of the embodiment in Figure 10.

[0070] Figure 8 shows an embodiment of an assembly comprising on the one hand a device 1'" according to the invention of figure 10, without the topical liquid reservoir P, and on the other hand a sarcophagus 700.

[0071] The cooling device T”, without the reservoir containing the topical product P, is received in a sarcophagus 700, in two half-parts 701 and 702, which define between them an internal space of dimensions adapted to receive the cooling device. Each half-part has an outer shell and an inner shell which define between them a sealed space for receiving a eutectic liquid, preferably identical to that received in chamber 40”.Thus, when the cooling device and sarcophagus are placed in a freezer / refrigerator with a temperature lower than that of the eutectic liquid in the sarcophagus and cooling device, it is ensured that the bead, after being removed from the freezer, will be at a temperature suitable for contact with the user's skin, specifically the temperature between -8°C and -10°C appropriate for cryolipolysis, corresponding to that of the eutectic liquid in the cooling device, and not that of the freezer (typically -18°C or lower), which is too low for skin contact. Furthermore, a cap 704 can be provided to replace the pipette 600 during placement of the device in the sarcophagus.

[0072] Obviously, in sarcophagus 700, we could replace the device T” of figure 10 with any of the cooling devices 1, T or 1” from the other figures.

[0073] According to the invention, the cooling means, and in particular the cooling fluids, are immobile within the device, and in particular the fluids, for example the eutectic liquid L, do not undergo any displacement, in particular are not projected onto the ball.

[0074] In this description, various embodiments are described, which share common characteristics and some characteristics specific to each of them. Obviously, each of these Special features may also be implemented in other embodiments, either in combination with their own special features or in place of them or some of them, and it is the intention of this description to also describe these combined embodiments.

Claims

Claims

1. (Cooling device (1; T; 1”; T”) for cooling the surface of an element, in particular an element of the human body, for example a part of the skin of a human being, comprising: - a basic body (2), defining, in the upper part, at least one housing (3) designed to receive a ball (4); - a ball (4) made of thermally conductive material, in particular steel, received in the housing (3), the ball (4) being held in the housing so as to be able to rotate on itself, and at least part of the outer surface of the ball projecting, in the upper part, outside the housing and being able to be brought into contact with the surface to be cooled; and - cooling means for maintaining the ball at a low temperature, the cooling means being arranged in the base body so as to extend at least partly laterally relative to the ball, preferably at least partly at the level of the ball.

2. Device according to claim 1, characterized in that the cooling means are received in a chamber (40) or cooling chambers extending laterally with respect to the ball.

3. Device according to claim 1 or 2, characterized in that the or each cooling chamber (40) extends laterally relative to the ball from the lower pole of the ball to at least the height of the center (C) of the ball.

4. Device according to one of the preceding claims, characterized in that, along at least one latitude, the or each cooling chamber extends around the entire circumference of the ball, in particular at least over the entire latitude zone between 0° (level of the center of the ball) and 90° south (lower pole of the ball at the bottom of the housing).

5. Device according to one of the preceding claims, characterized in that the cooling means (10, 11; 20, 21; 10, 11, 20, 21) consist of at least one cooling block (10; 20; 10, 20) formed of a sealed casing (11; 21; 11, 21), preferably sufficiently rigid to hold itself, defining a sealed compartment filled with a fluid having a low temperature.

6. Device according to one of claims 1 to 4, characterized in that the cooling means (10, 11; 20, 21; 10, 11, 20, 21) consist of a fluid having a low temperature, in particular a eutectic liquid, received in the cooling chamber(s) which define one or more respective sealed compartment(s) filled with the fluid having a low temperature.

7. Device according to one of the preceding claims, characterized in that thermal insulation means are provided, in particular a sheet of insulating material around at least part of the cooling means, in particular around at least part of the cooling chamber(s).

8. Device according to one of the preceding claims, characterized in that the device comprises a removable upper cap (9), auxiliary cooling means, in particular at least one auxiliary cooling block (20), being received in the cap (9) so as to extend laterally relative to the ball when the cap is in the closed state.

9. Device according to claim 8, characterized in that the auxiliary cooling means, along at least one latitude between 90° north (upper pole of the ball outside the housing) and 0° (level of the center of the ball), extend around the entire periphery of the ball.

10. Device according to claim 8 or 9, characterized in that the auxiliary cooling means extend over a latitude zone of the ball not covered by the cooling means, so that the ball, in the closed state of the cap, is entirely surrounded by the cooling means and the auxiliary cooling means.

11. Device according to one of claims 8 to 10, characterized in that a magnet is incorporated in the upper cap, in particular by being fixed thereto, so as to interact with the metal ball to ensure the removable closure of the cap.

12. Device (1, 5; 1', 5'; 1”, 5”; 1'”, 600) for applying a product to a surface, in particular the skin of a living being, in particular a human being, comprising: - a cooling device intended to cool the surface of an element, in particular an element of the human body, for example a part of the skin of a human being, comprising: - a basic body defining at least one housing designed to receive a ball therein; - a ball made of thermally conductive material, in particular steel, received in the housing, the ball being held in the housing so as to be able to rotate on itself, and at least part of the outer surface of the ball protruding from the housing and being able to be brought into contact with the surface to be cooled; and - cooling means intended to maintain the ball at a low temperature; and - a reservoir of a product, in particular topical, in fluid form, in particular liquid or gel, intended to be deposited on the surface to be cooled by the ball, the reservoir being fixed, in particular in a removable manner, to the cooling device so as to have an opening opening out opposite the ball so as to allow contact of at least part of the ball with the product contained in the reservoir.

13. Device according to one of the preceding claims, characterized in that it comprises sensor means capable of determining the temperature of the ball and display means capable of displaying one or more data relating to the temperature of the ball.

14. Device according to claim 13, characterized in that the ball is covered with a layer of a thermochromic material, the layer changing color, for example from green to red, when the temperature of the ball becomes higher than 0°C.

15. Use of a device according to one of the preceding claims for cryolipolysis and / or cryotherapy. |

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