Description Title of Invention: Cryosurgery Device Technical Field [1] The present invention relates to cryogenic therapeutic treatments and in particular provides a device to facilitate targeted delivery or cryogenic fluid to a defined area of skin or tissue whilst preventing unintended overspray of fluid on normal surrounding tissue; with apertures of various sizes to allow for precise application onto skin lesions of various sizes and comprising of a handle to allow for the application of fluid with minimal risk of contact with fluid or harm to the user. Background Art [2] Cryosurgery is the destruction of tissues, particularly lesions on the skin or mucous membranes, using the properties of freezing. A common method of freezing lesions by medical practitioners is using liquid nitrogen as the cooling solution. Cryotherapy using liquid nitrogen (temperature -196C) involves the use of a spray gun, cryoprobe or a cotton-tipped applicator. The nitrogen is applied to the skin lesion for a few seconds, depending on the desired diameter and depth of freeze. [3] Cryosurgery works by taking advantage of the destructive force of freezing tem peratures on cells . At low temperatures, ice crystals form inside the cells, which ul timately results in cell death. More damage occurs when blood vessels supplying the diseased tissue also freeze. [4] As an alternative to liquid nitrogen, a mixture of dimethyl ether and propane is used in some preparations designed to be used for cryosurgery. The mixture is stored in an aerosol spray type container at room temperature and drops to -41 'C (-42 'F) when dispensed. The mixture is often dispensed into a straw with a cotton-tipped swab. Other liquids and gases have been used by physicians to achieve the effect of cryosurgery by destructive freezing temperatures. [5] Cryosurgery is a minimally invasive procedure, and is often preferred to more tra ditional kinds of surgery because of its minimal pain, scarring, and cost; however, as with any medical treatment, there are risks involved, primarily that of damage to nearby healthy tissue. In addition the physician is faced with several difficulties in the practical application of liquid nitrogen using a handheld spray gun- that of minimising overspray of the liquid onto surrounding tissue; and if using some of the existing methods there is also the risk of the physicians hands coming in contact with the fluid. [6] Handheld liquid nitrogen cryosurgical devices and other refrigerant devices have been used to treat a wide range of common skin lesions. Conditions commonly treated in general practice are: Verruca (warts), Actinic Keratoses, Seborrheic Keratoses, Molluscum, Papilloma (skin tags), Lentigines (age spots), Condyloma (genital warts), and Basal Cell Carcinoma (skin cancer). Disclosure of Invention Technical Problem [7] This invention has been specially designed in order to provide an improved means for the application of cooling liquid from a spray gun when performing cryotherapy whereby the liquid may be accurately applied to a defined area minimising damage to surrounding healthy skin whilst also providing for a device that maximises the safety and comfort of the physician using the device. [8] Existing methods in common use to achieve a freeze effect targeted to the lesion are: 19] Spraying the liquid using a pulsing action whereby spraying is momentarily ceased once the freeze area is seen to extend beyond the desired treatment diameter. This method has the disadvantage of being time consuming, causing difficulty in accurately estimating the actual freeze time applied to the lesion, and in addition the method fails to consistently protect the surrounding skin due to dependence on the operator to pulse on the trigger of the spray gun and depending highly on a predictable rate of discharge from the gun. [10] Using a disposable plastic otoscope specula, whereby the physician holds the otoscope specula between the fingers and presses it against the patients skin to surround the lesion. The cone shaped specula are often trimmed to form a diameter suitable to surround the lesion. This method has the disadvantage of causing harm to the fingers of the physician when the freezing temperature transmits through the plastic of the specula onto the hand when holding it in place for cryotherapy treatment. In addition this method appears unprofessional to patients and therefore interferes with the relationship of trust required between physician and patient. [11] In addition there have been a number of commercially available products hoping to improve on the above existing methods; including various sized probes that may be attached to the end of the spray gun device. These have disadvantages in terms of cost of the devices, and the need to change the probe size based on the diameter of the lesion intended for freezing. [12] In addition, US6226996 provides a device that uniformly cools a surface to a specified temperature using a mist of cryogenic fluid. The device comprises a cryogenic fluid reservoir, a valve for controllably releasing the fluid through an atomizing nozzle, a non-contact temperature sensor, and a control unit to display the measured temperature. The control means can optionally pre-set the desired surface temperature and control the valve. The application of mist can be controlled. However, this device does not limit the area of application of the cryogenic fluid. [13] US6319248, US5899898 and US5147355 all describe devices that provide for the application of cryogenic liquid via spray catheter. These have limitations for the general use in office cyrotherapy in relation to cost and relative complexity in bedside use. [14] WO/2007/028975 describes an applicator for the dispensing of cryogenic fluid comprising a cup shaped element and exhaust valve; in use, the cup is held against the skin over the area to be treated. Cryogenic material is supplied via a tube from a cryogenic source such as an aerosol equipped with a valve to effect a controlled release of cryogenic gas. When the liquid gas is released it collects within the 'cup' thereby affecting only the portion of the skin contained within the 'cup' area. This device has the disadvantage of requiring the physician to change cup sizes depending on the size of the lesion to be treated. [15] Another device is an acrylic plate comprising transparent acrylic plate with various sized apertures on the plate. One such type of acrylic plate device is marketed by Brymill Cryogenic Systems having a trade name 'Cryoplate'. A distinct disadvantage of this system is the absence of any handle thus the problem of the physician's skin coming into contact with the fluid is not resolved and in addition the absence of any handle makes the device difficult for the physician to hold firmly against the patient's skin. In addition the present acrylic plate devices are not able to be sterilised by au toclaving. [16] Given the disadvantages of current epidermal and mucosal epidermal skin cooling techniques for use by physicians performing cryosurgery, a need exists for a device that provides a safer method for performing this common medical procedure. Technical Solution [17] This invention is novel and represents an improvement on these other methods in that it incorporates a handle for safety and ease of physician use, a means for directing the flow of cryogenic liquid to the pathological lesion, and a means for limiting the pos sibility of liquid coming into contact with surrounding healthy skin. The device also provides for lightweight device able to be inexpensively manufactured whilst appearing professional and purpose designed. [18] A handheld cryosurgery device in accordance with this invention comprises in shape one facing with various sized apertures and one moulding defining the portion of the device to be held within the hand of the use; of which the surface with apertures comprises a facing and the apertures provide a conduit for the delivery of cryogenic fluid. [19] According to the present invention there is provided a cryotherapy device including at least: a moulding being the handle of suitable size and construction to allow for ergonomic, comfortable and stable handling of the device at a distance allowing for ap plication of the liquid to the patient skin with reduced possibility of the liquid coming into contact with the skin of the physician; and whereby there is provided a facing in which are provided apertures of various sizes; and which facing lies in a plane ap proximately perpendicular to the plane of the apertures and therefore parallel to the moulding or handle. [20] The apertures of various sizes allow for application of the liquid over the limited area defined by the diameter of the apertures and therefore overspray onto surrounding healthy tissue is avoided. [21] Preferably the construction of the device is from material suitable for sterilisation by autoclaving. [22] Preferably the device is made from plastic. [23] Preferably the apertures are provided of various diameters in order to surround lesions of various sizes. Advantageous Effects [24] The present invention provides for a device that addresses the common difficulties encountered in the bedside application of cryogenic fluid when performing cryosurgery; namely difficulty in limiting the area of cryogenic fluid application to the required area, of potential for user to come into contact with the cyrogenic fluid during the application to a patient, and the cost and complexity of existing devices that do address these difficulties. The present invention represents an improvement on these other methods in that it incorporates a handle for safety and ease of physician use, a means for directing the flow of cryogenic liquid to the pathological lesion, and a means for limiting the possibility of liquid coming into contact with surrounding healthy skin with all the advantageous effects incorporated into the one device. The present invention also provides for device able to be inexpensively manufactured whilst appearing professional and purpose designed. Description of Drawings [25] The invention may be better understood with reference to the illustration of em bodiments of the invention which: [26] Figure 1 is an elevation of the device showing all features of the device. [27] The device shown comprises one moulding or handle (1) being the moulding referred herein which the may be held by the user of the device allowing for safe, comfortable and stable use of the device, and is designed to have maximal mechanical and ergonomic advantage in applying the apertures to the skin lesion. The facing (2) in corporates the apertures (3) of various sizes, and the said facing (2) lies roughly or ab solutely parallel to the handle or moulding. The apertures are aligned roughly or ab solutely perpendicular to the facing surface so that they are aligned perpendicular to the surface of the skin in order that cryotherapy liquid might be applied through the apertures which therefore act as conduits for the flow of the liquid from the spray gun to the lesion. The apertures (3) are provided for application to the surface of the skin, whereby the device allows for the user to choose the most appropriate aperture size based on the size of the lesion, and then the flow of cryotherapy liquid from the spray gun is directed towards the opening of the chosen aperture to direct flow of the liquid to the area of skin encompassed by the distal end of the aperture which is applied to the skin surface surrounding the lesion. [28] Best Mode [29] Mode for Invention [30] Industrial Applicability [31] Sequence List Text [32]