For safety's sake, he brought along the company's best engineer to provide technical support, just in case. Although he is very familiar with his own product technically, he is somewhat inexperienced with the on-site process.
The Institute requires that the chief surgeon, instrumental nurse, and assistant must be very familiar with the product, and on-site engineers are not allowed to join the operation. Therefore, the engineer can only stay off the operating table and help handle some technical crises, such as replacing the artificial heart if contamination occurs. Of course, such situations are almost impossible, but surgery must be flawless, with multiple backup plans in place—better to have them and not need them than to encounter an unforeseen emergency without them.
