Cryonics Cryosurgery

The technology involves the cooling down of a person who is legal deceased to liquid nitrogen temperature, where physical decay essentially stops, in the hopes that in the future advanced scientific procedures may be able to revive them and restore them to their living bodies. A person held in this state is said to be a "cryopreserved patient"- since the cryopreserved person is not viewed as being "dead". The question of cryonics being done to patients who are still living is not one that can be answered yet. It is not legal to do so. In an ideal situation, cryopreservation would be done to a patient prior to the terminal illness state, but this is not something that is presently done to the laws governing the state.
Once under this state, there is a possibility of revival because more cells, organs, and tissues are being cryopreserved reversibly. This means that with the temperature state one is under and the ability to maintain the cellular integrity, there will be no decomposition and with the advent of nanotechnology the hope is that technology will be able to repair the damage that age, disease and freezing may cause.
It is thought that once one is declared dead- they must be. Modern medicine has been able to revive those that have been labeled clinically dead for a few minutes to a few hours. If this can be accomplished, when at one time in history it was thought that it could never be accomplished. Thus, the possibility of reviving cryopreserved patients may not be so far fetched.
As the methods of freezing improve, and more research in "vitrification" are developed, there will be less of a burden on future technology, consequentially, earlier revival. Vitrification means formation of a glasslike solid as temperature falls, this will stop the formation of ice crystals that may damage tissues, eliminating freezing damage altogether.
The down side to the process is that there is no guaranteed success, because it is not feasible to guarantee the future. No one person can predict scientific progress with accuracy, but there is a possible case for the success of cryonics. It is important to discuss this with a qualified professional and make sure that you understand the dynamics involved. This may be a process that you may want to be a part of, with the supervision and guidance of a qualified professional.