according to an embodiment of the present invention a device for cold therapy comprises means , such as a nozzle , for producing mist from liquid provided for the device . mist stream is sprayed to a surface area of a treated object in order to cool said treated object . the cooling effect of mist in the present invention is based on the high enthalpy of vaporization of liquid , such as water . as can be seen in fig1 , fine mist , comprising a lot of small droplets , forms a large evaporation surface , which causes an efficient evaporation . evaporation process requires energy ( r = 2256 kj / kg ), which is taken from heat of the surrounding air and the treated object . due to the heat loss the treated object cools down . the right droplet size of mist is essential in the present invention . normally , sauter mean diameter ( smd ) is used to represent an average particle size in fluid dynamics . smd is typically defined in terms of the surface diameter , d s , and the volume diameter , d v , as following in this paper , smd of mist is preferably about 15 μm - 150 μm , more preferably about 30 μm - 100 μm , and most preferably about 50 μm - 80 μm . mist having a greater smd will not evaporate as well , because the area / volume ratio of a droplet decreases exponentially , when the radius of droplets increases , and the result will be more like normal shower with water drops without a sufficient evaporation effect . in that case , when using liquid having a sufficient low temperature , that shower can cool the treated object , but it can be very unpleasant experience and is based on cooling effect of cold water instead of evaporation of mist . in addition , the number of the droplets applied to a skin area of the treated object affect to the cooling of the treated object . the number of the droplets highly depends on the size of the area and cannot be exactly defined . advantageously , the treated area should be at least twice covered with droplets for achieving satisfactory cooling effect , but the person skilled in the art will understand that more mist droplets can also be used for cold therapy . the temperature of the used liquid also affects to the cooling effect of mist . depending on embodiment , the temperature of the used liquid can vary widely , for example between 0 ° c .- 55 ° c ., but preferably the temperature of the used liquid is below the normal human body temperature . in embodiments , wherein the treatment is directed to an animal , for example , the temperature of the used liquid is preferably selected to be under the normal body temperature of the treated animal in question . in one embodiment , cold tab water is used as liquid in the present device . the temperature of cold tab water can vary , but preferably it is below 15 ° c ., and , when altering water to mist , it may cool even more . the device of the present invention can further comprise separate cooling means , such as carbon dioxide i . e . “ dry ice ”, for cooling the used liquid , especially in summer . the other cooling means may also be used , but , preferably , cold tap water is adequate for cold therapy with the present device . when using a separate cooling means for cooling the used liquid , the liquid is preferably cooled before it is fed the hose system of the device . in another embodiment , the cooling and / or heating system is arranged in the hose system , e . g . between hose branches . this enables the use of the device for alternating treatment in such way that the water for the device is provided from the local water distribution system and heated / cooled to a desired temperature before alternated it to mist stream . in another embodiment , the temperature of the used liquid is about 15 ° c . or more . in this embodiment , it is advantageous to control humidity of the space the device is used in . if relative humidity rises too high level , it substantially impairs the evaporation process of mist typically , humidity is controlled by arranging sufficient air ventilation in the space . as the person skilled in the art will understand , the air ventilation can also be arranged in connection with other embodiments . in one embodiment , the used water supply is a local water distribution system and the water is directed to the hose system of the device with a normal pressure used in the water distribution system , typically e . g . about 3 - 4 bar . however , liquid having a higher pressure can also be used and it may be advantageous for producing mist having suitable droplet size . in that case , the pressure can be e . g . about 7 bar . if the local water distribution system does not provide a sufficient pressure , an additional pressure raising means can be used in connection with the device . the higher pressure is more efficient , because the required number of the droplets for the treated skin area is faster fulfilled . the pressure of the liquid may also be adjustable in order to adjust the mist stream . in one embodiment , the device comprises means , such as pressurized air , for adjusting the pressure of the liquid used in the device . in another embodiment , liquid , some other than water , is used for producing mist the used liquid can be e . g ., but not limited to , oil , milk , ethanol , lotion or water with nurturing ingredients , such as essential oils , perfumes , etc . in another embodiment , the device is arranged to operate by using a separate water reservoir , such as a water canister , for example . in this case , the pressure in the hose system is arranged in some other manner , such as using separate pressurizing means , e . g . pressurized water canister or compressed air system . normally , the separate water reservoir is sized for the use e . g . 40 - 50 l / h , and , the using time typically being e . g . 15 - 30 min , e . g . 25 l water canister can be adequate for one treatment , for example . in an embodiment , air stream is provided in connection with mist stream . this feature can be implemented in various ways , but in one embodiment , both mist stream and air stream is provided in the same nozzle . in one embodiment , one or more used nozzles in the device are a cone nozzles spraying mist stream in an angle , e . g . about 80 degrees , in a form of cone and spraying air stream in the middle of the nozzle . the person skilled in the art will understand that air stream can also be provided some other way , such as dedicating one or more nozzles to air stream and others to mist stream , for example . the evaporation effect can further be improved by arranging a drainage system to the floor of the space , where the device is used . if waste water is removed , it does not evaporate to air and raise the humidity level . an applying time of mist stream can vary depending on the size of the treated area and the meaning of the usage , but typically the device is used a couple of minutes , such as about 2 to 5 minutes , but the device can be used a longer time , especially if a larger surface area is about to be treated . the temperature of the surface of the treated object is intended to decrease several celsius degrees , such as about 15 ° c .- 26 ° c . for example , when treated is a human , the surface temperature of the treated area can be about 11 ° c . after the treatment . next , components and function of an exemplary device for cold therapy according to the present invention is discussed with reference to fig2 - 4 . an exemplary configuration of the device 100 for cold therapy comprises at least one arm 102 , which arm 102 comprises at least one nozzle 104 , which nozzle can be aimable . the nozzle 104 is connected to a liquid supply ( not shown ) and configured to spray mist in a desired direction . in an exemplary configuration of the device according to the present invention presented in fig2 - 4 , the device 100 comprises six arms 102 arranged in a circle or in an oval form . the person skilled in the art will understand that the arms of the device can be arranged in some other appropriate form than above mentioned shapes . depending on embodiment , the arms can be in a semicircular form or in a line , for example . in one additional embodiment , the arms are arranged to be detachable from the base structure , so that the arm can be used as a hand held device . in a preferred embodiment , the number of arms is e . g . 4 - 6 , but , depending on embodiment , the number of arms may be more or less . the device can be configured , so that the number and the position of arms can be changed , when the usage of the device changes . preferably , the arms are made from a durable , but lightweight material , such as aluminum , stainless steel or some other suitable material . the arms advantageously comprise means for attaching nozzles to the arm , such as clamps or some other suitable fasteners . nozzles may also be fastened to an arm some other way , such as by using fast coupling means . in some other embodiment , the nozzles comprise means for shutting and opening them , which enables the configuration of the number of used nozzles to be changed without detaching or attaching nozzles in the arm . in fig2 - 4 , each arm comprises four nozzles 104 aimed to spray mist stream to the centre of the circle . it should be obvious to the person skilled in the art that the number or the position of the nozzles in an arm or in the device can be changed freely depending on the use of the device . as well , in one embodiment , the arms have a telescopic structure , which enables the arms to be lengthened and / or shortened , when more or less nozzles are needed or when the position of a nozzle / nozzles is / are changed . the nozzles 104 can be any appropriate nozzle for producing mist in a preferable embodiment , the nozzles are adjustable so that the droplet size produced by the nozzle is changeable . typically , the nozzles 104 in the arms are arranged in different levels , so that object to be treated is sprayed with mist streams in several levels . if the object to be treated is a human , the nozzles are typically adjusted so that mist covers the person &# 39 ; s whole body leaving the head out . it is characteristic for the mist stream that the stream turns downwards when hitting a solid object , such as a treated body , or when collided with another mist stream , in which case the streams combine and the combined stream turns downwards . in one embodiment , the levels of the nozzles 104 in the arms 102 is selected so that the nozzles 104 in different arms 102 are disposed substantially in the same level . in that case , two or more mist streams can be arranged to collide so as to form a combined downwardly directed stream . by using this feature a larger mist stream can be provided in order to treat a part of the body , a lying person and / or an animal , for example . in the exemplary device presented in fig2 - 4 , the arms are further connected to foot parts 106 forming a base frame 108 , which is intended to keep the device 100 in a substantially upright position . the position of the arms can be some other than upright , e . g . an angle with the ground level . the base frame is advantageously arranged to lie on the floor , which provides the needed support to the arms used in the upright position . in addition , two side braces 110 are connected between foot parts 106 in order to improve the support provided by the base frame 108 . in addition , the foot parts 106 of the base frame 108 may further be connected to a centre part 112 , which can define a treatment area for treated person to stand . the centre part can further prevent or at least reduce water leakage from the treatment area . in some embodiment , a sensor or sensors are provided to centre part for observing the water temperature , for example . it should be obvious to the person skilled in the art that the device according to the present invention can be implemented without the centre part and the centre part can be auxiliary or additional component in the device . like the arms , the base frame and the components thereof are made from a durable , but lightweight material , such as aluminum , stainless steel or some other suitable material . the foot parts 106 can comprise e . g . a groove for adjusting the position and distance between the arms . in addition , the foot parts can comprises means for fastening the arms to the base frame . however , the person skilled in the art understands that the device can also be implemented without a base frame or any other support part . in some embodiments , the device is configured so as to be held in a hand , for example . the nozzles are further connected to a water supply . preferably , water is provided to the nozzles via a hose system 114 , which , typically , comprises connecting means 120 suitable for to be connected a local water distributing system . the water can be provided to each arm with a larger hose 118 , which is used to connect the hose branch 116 or hoses between the arms 102 . in some embodiments , the hose system 114 is integrated to the arms 102 and / or the base frame 108 . in that case , a nozzle may be possible to add or remove from an arm without any arrangement in the hose system . in another embodiment , each nozzle is connected to a hose or a hose branch 116 and hoses or the house branch 116 can be fastened to the arm or just the nozzles are fastened and the hoses / hose branch are left to hang freely . in some auxiliary or additional embodiment , the device also comprises heating means . usually , in that case , the device is used for altering treatment by alternately using cold mist and hot mist . in that case , one water type or both water types can be provided for the device from a separate reservoir / reservoirs . separate reservoir can be advantageous , because hot water can be heated to a desired temperature and provided from the separate reservoir to the device . in some embodiments suitable for altering treatment , some nozzles can be dedicated to hot water and the others to cold water . in some embodiment , the device further comprises one or more temperature / pressure sensors for monitoring and / or ensuring the temperature and / or the pressure of the used liquid . fig5 depicts another exemplary device according to an embodiment of the present invention . in the present figure , it can be seen how the device according to the present invention can be attach to a regular shower arm instead of or in addition to a shower head . in the present embodiment , the device comprises a member 502 , which can be attached to the shower arm . in this configuration , six nozzles 104 are connected to the arm 102 to provide mist stream to both sides of a user . although , the description concerns to using of the present for cold therapy , it is possible to use the device for washing instead of a traditional shower . using the device for washing requires typically several nozzles , which may be arranged in several levels , e . g . 3 - 4 levels , or in one level for producing sufficient amount of mist , so that the washing procedure is pleasant experience and the water amount is adequate for washing and rinsing . the used water temperature can be selected to be higher than the used water temperature for cold therapy . the easiest way to provide warmer water for the device is to connect the hose system to a warm water supply . as described above , the water heating system can also be used for heating the water for washing . the configuration of the device , i . e . the number and the location of the nozzles , as well as droplet size of the mist , the number of the arms , the base frame construction are selected so that the use of the device is kept in mind . the aim is to produce a thick mist stream ( s ) suitable for the present purpose , e . g . treating a part of the body , the whole body or various objects in various dimensions . however , it is not desired to produce mist streams that are not needed in that time , because that is a waste of water . therefore the device of the present invention is usually enabled to be adjusted in different ways within the scope of the invention , as described above . the scope of the invention is determined by the attached claims together with the equivalents thereof . the skilled persons will again appreciate the fact that the explicitly disclosed embodiments were constructed for illustrative purposes only , and the scope will cover further embodiments , embodiment combinations and equivalents that better suit each particular use case of the invention .
a device for cold therapy using cooling mist . ice baths and cryogenic chamber are previously known solutions for cold therapy , but both suffer from several disadvantages , such as space requirements . the present device for cold therapy includes elements , such as a nozzle , for producing mist from liquid provided for the device , which mist stream is sprayed to a surface area of a treated object in order to cool the treated object , wherein the sauter mean diameter of the mist is at most 150 μm .