Simple techniques for circumferential cryoanesthesia, publis
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Cooling is an effective method for anesthesia (cryoanesthesia) in a wide range of procedures in dermatology including botulinum toxin injections for palmar hyperhidrosis. Ice can be applied directly to the skin then removed for the delivery of a relatively painless injection. However, having effective cryoanesthesia without the need to remove the ice instrument might be more practical and effective. Circumferential cryoanesthesia can be used to achieve this goal. This has been described with the use of a glove filled with water and allowed to freeze. Circumferential cryoanesthesia is then achieved by injecting between the glove fingers. However, the full glove might be quite bulky to handle and might not practically provide full circumferential cryoanesthesia.

Solution--
Cotton has been described as a method to hold water and get frozen for the use in dental anesthesia. However, this was not used to provide circumferential anesthesia. Two simple methods are described using sponge or cotton. A small hole is created in the middle of a sponge. The sponge is then soaked in water and allowed to freeze. It is important to place a plastic sheet beneath the sponge in the freezer in order to hold the absorbed water in place. Sometimes a thin layer of ice develops in the hole which can be easily broken. The frozen sponge can then be used for circumferential anesthesia. The smaller the created hole is, the more effective the anesthesia
will be.

Source: https://www.jaad.org/article/S0190-9622(20)33171-6/fulltext?rss=yes
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