Abstract: Various methods and devices are provided for allowing multiple surgical instruments to be inserted into sealing elements of a single surgical access device. The sealing elements can be movable along predefined pathways within the device to allow surgical instruments inserted through the sealing elements to be moved laterally, rotationally, angularly, and vertically relative to a central longitudinal axis of the device for ease of manipulation within a patient's body while maintaining insufflation.

Abstract: A waste heat recovery system for a heater treater which elevates the overall energy imparted into crude oil from a finite amount of combustion gases. The system includes a vertical heat exchanger supported from the shell of the heater treater. The exchanger has an outer housing within which a plurality of longitudinally arranged tubes are disposed. Untreated crude flows through the interior of the tubes while waste heat from the fire tube is conducted into the lower end portion of the housing so that the outer surface of the tubes contact and extract heat from the flue gases. The flue gases exit through the upper end of the housing. The temperature elevation of the incoming crude is controlled by a damper assembly located at the lower extremity of the exchanger, which admits atmospheric air into the housing.