Changing doctors during surgery is usually not allowed.

This is because surgery is a highly complex task that requires close collaboration and a high degree of concentration between the doctor and the surgical team. If the doctor is changed in the middle of the procedure, it will cause a great deal of disruption to the surgical process and communication between the doctors, which may adversely affect the safety of the patient's life and the outcome of the surgery.

However, under some special circumstances, if the patient or his/her family has reasonable grounds for requesting a change of doctor, the medical institution may consider and take appropriate measures. For example, if there is a serious medical incident or complication in the course of surgery, the medical institution may consider changing the doctor to protect the safety and rights of the patient.

In addition, if the patient or his/her family has special requests and these requests are medically reasonable and feasible, the medical institution may also consider changing the doctor.