Abstract: A multi-lumen catheter that contains two or more independent coaxial sensing elements which can be used for measuring and recording temperature over a wide area at the insertion site. In addition, this catheter can be used for withdrawing blood at its distal port. When a microwave probe is inserted into the proximal lumen and positioned within the catheter, it allows for accurate placement of the microwave field within the area which is temperature monitored.

Abstract: There is disclosed a surgical stereotaxic array plug of biocompatible material having an outer periphery adapted to be secured in a complementary threaded opening provided in the skull with bores traversing the plug for receiving and positioning therapeutic apparatus and fluid dispensing devices.

Abstract: A method of diffusing dopant material into the crystal surfaces of silicon crystal slices which comprises placing the dopant material in the form of wafers between the adjacent major faces of each of a stack of silicon crystal slices, clamping said slices and wafers together as an assembly within a refractory boat so that the crystal slices are in substantially parallel vertical disposition with their entire facing surfaces covered by dopant material and thereafter introducing the boat and the assembly into a zone of high temperature wherein the dopant material is simultaneously diffused into the major faces of the silicon crystal slices. Other arrangements of silicon crystal slices and dopant wafers of the same or different materials can produce slices diffused on both sides with the same dopant or with a different dopant material on each side.

Abstract: A method of applying a boron dopant to silicon slices which comprises applying a dopant solution to the faces of each slice, packing a plurality of slices adjoining each other in a quartz boat and inserting the boat slowly into a tubular furnace. The boron surface of each slice is covered with alumina powder to eliminate sticking. After heating at 1350.degree. Celsius for four hours the slices are slowly pulled out of furnace.