Medical multi-link boom

A suspension arm assembly comprising:

• at least three horizontally aligned members relatively rotatable about each other, each member of the at least three horizontally aligned members having a load bearing periphery and comprising a body in which an uppermost surface of the body and a lowermost surface of the body define a vertical extent of the load bearing periphery, each adjacent pair of the at least three horizontally aligned members being connected to each other by a joint;
• conduits extending along the at least three horizontally aligned members, wherein all of the conduits that extend along the at least three horizontally aligned members extend vertically outward of the vertical extent of each of the load bearing peripheries of the at least three horizontally aligned members;
• a brake system comprising a brake at each joint for selectively preventing movement of respective adjacent ones of the at least three horizontally aligned members about the joint;
• at least one shell arranged about the at least three horizontally aligned members and the conduits;
• a connecting assembly rotatably connected to one of the at least three horizontally aligned members;
• and
• a service head that is connected to the at least three horizontally aligned members via the connecting assembly, wherein at least one shelf connected to the service head comprises at least one sensor of the brake system for releasing the brake at at least one of the joints.