Abstract: A surgical instrument and method are disclosed for enhancing the overall performance of arterial occludes, by allowing the repetitive obstruction of blood flow to a targeted organ or tissue (e.g., heart muscle, brain, kidney, gastrointestinal tissue, leg muscles, arm muscles, other skeletal muscles, or tumors), while reducing the potential for side effects such as gangrene or infarction and for post-implantation movement of the occlude during ischemia. The micro-pneumatic snare allows the repeated occlusion (i.e., the iterated obstruction or closure of a passageway or vessel) of targeted vessels to deprive a selected organ or tissue of blood and oxygen profusion, while the patient may, in general, remain conscious. The micro-pneumatic snare also allows for the stimulation of functional response adjustments in targeted tissues and organs, such as angiogenesis and collateral vessel growth in response to repetitive per fusion obstruction.

Abstract: A surgical instrument and method are disclosed for enhancing the overall performance of arterial occluders, by allowing the repetitive obstruction of blood flow to a targeted organ or tissue (e.g., heart muscle, brain, kidney, gastrointestinal tissue, leg muscles, arm muscles, other skeletal muscles, or tumors), while reducing the potential for side effects such as gangrene or infarction and for post-implantation movement of the occluder during ischemia. The micro-pneumatic snare allows the repeated occlusion (i.e., the iterated obstruction or closure of a passageway or vessel) of targeted vessels to deprive a selected organ or tissue of blood and oxygen profusion, while the patient may, in general, remain conscious. The micro-pneumatic snare also allows for the stimulation of functional response adjustments in targeted tissues and organs, such as angiogenesis and collateral vessel growth in response to repetitive perfusion obstruction.

Abstract: A finned tube heat exchanger having an improved flat louver fin configuration for increased heat transfer efficiency and low air pressure drop. The fins comprise generally planar sheet metal plates having a pattern of spaced apertures for receiving a group of heat exchanger tubes perpendicularly to the fin plate. Groups of louvers are formed as elongate strips extending generally in an area between adjacent tubes. The strips are selectively offset, i.e. raised or lowered from the nominal plane of the fin, so as to establish a louver pattern having flat louvers in a number of different planes each parallel to the direction of flow of air across the fin. Stiffness is provided for the fin plate by providing a slope and offset of the leading and trailing edges of the fin plate such that they are displaced in a direction parallel to the axes of the tube.