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 twin carriage coiled tubing injector apparatus for use in inserting coiled tubing into a well, temporarily suspending the coiled tubing, and removing the tubing from the well. The apparatus includes a superstructure with a pair of spaced carriages disposed therein. The carriages each have a gripper chain drive system rotatably mounted thereon and movable therewith. An actuation and linkage system allows the carriage to be moved toward and away from one another in a transverse direction with respect to the superstructure. This movement allows gripper chain systems to be engaged or disengaged from tubing extending through the apparatus. A roller chain system is disposed in each of the carriages and is adapted for engagement and support of the gripper chain systems as the gripper chain systems are engaged with the tubing. A timing gear system may optionally be provided to insure that the rotational speed of the gripper chain systems are substantially constant.

Abstract: A burn nozzle for mixing petroleum products to be burned and air in which air is injected into the petroleum stream leaving a nozzle from an air can which is spaced from the nozzle and its petroleum product supply line such that any leakage from the oil supply line is into a space between the line and the air can and the petroleum products cannot be forced under pressure into the air can. The air can may be provided with a slip joint to accommodate unequal heating of the air can. The free end of the oil conduit and its outlet chamber may be smaller in diameter than the oil can and be threaded to the remainder of the oil conduit to permit its ready removal and replacement.