Abstract: A heat exchanger for fluids includes an elongated conduit. At least two spaced fluid passageways are defined in the conduit and extend longitudinally through the conduit from a first end thereof to a second end thereof. A heat transfer element thermally contacts a surface of the conduit to transfer heat to or from a fluid flowing through the at least two spaced passageways. The conduit can be unitary and of one piece. In one embodiment, the conduit can be a single crystal.

Abstract: A heat exchanger includes a plurality of tubes wherein at least some of the tubes are elliptical or oval in cross section and each tube includes a longitudinal axis. Each elliptical tube includes a major axis and a minor axis. The plurality of tubes is arranged in a radial pattern such that the major axes of the elliptical tubes intersect a centerline of the heat exchanger. The plurality of tubes is connected to a heater mount and a heater is also connected to the heater mount. A securing element holds the plurality of tubes, the heater and the heater mount together. A tube liner can extend along the longitudinal axis of at least one of the elliptical or oval tubes of the plurality of tubes. If a tube liner is employed, a purge fluid flow channel is defined between an outer periphery of the tube liner and an inner periphery of at least one of the elliptical or oval tubes of the plurality of tubes.

Abstract: A heat exchanger includes a plurality of tubes wherein at least some of the tubes are elliptical or oval in cross section and each tube includes a longitudinal axis. Each elliptical tube includes a major axis and a minor axis. The plurality of tubes is arranged in a radial pattern such that the major axes of the elliptical tubes intersect a centerline of the heat exchanger. The plurality of tubes is connected to a heater mount and a heater is also connected to the heater mount. A securing element holds the plurality of tubes, the heater and the heater mount together. A tube liner can extend along the longitudinal axis of at least one of the elliptical or oval tubes of the plurality of tubes. If a tube liner is employed, a purge fluid flow channel is defined between an outer periphery of the tube liner and an inner periphery of at least one of the elliptical or oval tubes of the plurality of tubes.

Abstract: The suction lavage system of this invention incorporates a pulsatile water lavage in combination with a suction system to improve the interface between a prosthesis, such as a hip replacement, and the interdigitating network of cancellous bone in which it is secured with acrylic cement. The water lavage effectively evacuates the medullary fat and hematopoietic tissue from the trabecular interstices of cancellous bone.The suction irrigation system comprises a probe having two configurations which assist in impinging water on cancellous bone for evacuating fat and tissue along with water to improve the interface between the bone and cement. It has been found that weakening of the interface through stress may result in loosening of a prosthesis. The probe consists of a water conduit generally located on the outside of a suction conduit.