Abstract: Certain aspects relate to systems and techniques for medical instrument navigation and targeting. In one aspect, a system includes a medical instrument having an elongate body and at least one sensor, a display, a processor, and a memory storing a model of a mapped portion of a luminal network and a position of a target with respect to the model. The processor may be configured to: determine, based on data from the at least one sensor, a position and orientation of a distal end of the medical instrument with respect to the model, and cause, on at least a portion of the display, a rendering of the model, the position of the target, and the position and orientation of the distal end of the medical instrument. The rendering may be based on a viewpoint directed at the target and different from a viewpoint of the medical instrument.

Abstract: Presented in one embodiment is a waist chain comprising a plurality of links; a plurality of coupling members which connect the plurality of links, thereby forming a chain with two ends; and at least one end connection member which is connectable to both ends of the chain such that the chain becomes continuous. The waist chain is positioned tightly around the waist of a person such that as the person's weight increases, the waist chain becomes increasingly tight. Presented in another embodiment is a waist chain comprising a plurality of links; a plurality of coupling members which connect the plurality of links, thereby forming a chain with two ends; at least one end connection member which is connectable to both ends of the chain such that the chain becomes continuous and at least one end link which is connectable to one or both ends of the chain and to the end connection member. The end connection member is a hollow cylinder comprising a side wall.