8. A robotic surgery system is a machine tool designed for use in an operating room to assist surgeons in joint-replacement surgery. The system operates by
cutting bone to a specific shape that accepts a joint-replacement implant. The system is illustrated in the following figure:
The system is much more precise than human surgeons and the benefits to the patient of robotic surgery are tremendous. Needless to say, the cutting process is complex and computer controlled. The cutting tool moves in an elaborate pattern to shape the bone. The location of the patient and all the robot equipment is determined precisely by a 3D tracking system.
Obviously the concern that the robot’s developers have is the possibility of the robot cutting something that it should not, for example, if the software calculated the wrong direction or distance for the cut. In an effort to prevent this, the cutting edge of the tool is monitored by a second computer system that computes the tool’s planned track separately. The primary computer and the tracking computer have to agree in order for the robot to proceed.
For the robotic surgery system:
(a) Identify the hazards to which you think the system is subject.
(b) Identify the degradation faults to which you think the system’s cutting head might be subject.
(c) Identify possible Byzantine faults that might occur in the system.