A voucher is a bond of the redeemable transaction type which is worth a certain monetary value and which may be spent only for specific reasons or on specific goods.
In 1985 a robot, the Unimation Puma 200, was used to place a needle for a brain biopsy using CT guidance. In 1992, the PROBOT, developed at Imperial College London, was used to perform prostatic surgery by Dr. Senthil Nathan at Guy's and St Thomas' Hospital, London. This was the first pure robotic surgery in the world.
The first successful open heart surgery was performed on July 9, 1893, when Dr. Daniel Hale Williams opened the chest of a man and repaired the pericardium (sac surrounding th â¦ e heart) which had been damaged by a knife stabbing. The patient recovered after 51 days and lived for another 50 years.