Study of contact methods to cool biological tissue in local surgery.

The method to cool a biological tissue with capillary–porous coverage is studied for application in local cryotherapy and to cure consequences of acute injuries (contusions and sprains). The isotherm dynamics T(t) by the depth Z of the cooled tissue (gel 4% gelatin solution, the tissue analogue in vitro) is investigated. The obtained data on isotherm dynamics T(t) have been compared with calculation results. A flexible capillary-porous coverage is chosen, which is convenient for local cryotherapy practice. It is quickly (during 5 seconds) soaked with a cooling agent, is pressed to the tissue, is fixed and cools the biological tissue for 3 minutes and longer. The basic diagram was obtained for the cooling power of a tissue by use of an ice package. The two cooling methods are compared.