Abstract: The present invention includes a fluid delivery device capable of delivering perfusion or other fluids to a vascular site. Preferred embodiments permit delivery of large quantities of fluid without causing recoil of the device, and without causing trauma to the vascular site.

Abstract: The present invention includes a guidewire device capable of delivering perfusion fluids to a vascular site while at the same time exhibiting handling characteristics associated with existing non-perfusion guidewires. Preferred embodiments include a perfusion guidewire which closely matches the dimensions and physical characteristics of standard guidewires. Preferred embodiments also permit high pressure perfusion of supersaturated solutions, and include a liquid flow path which will not promote bubble generation or growth, or destabilize a supersaturated solution.

Abstract: An improved torch for the mixing of oxidant and fuel gases external to the torch, for example for use in chemical vapor deposition processes, and its method of manufacture are disclosed. A first torch body portion is formed having a manifold cavity with one side open. A number of tubes extend from passages formed in a torch face plate through the first manifold cavity. A first liquid material (such as wax) is poured into the cavity, such that its upper surface defines the desired inside wall surface of the first manifold corresponding to the open side. This material is allowed to harden. A second liquid material (such as epoxy) is then poured over the first material, and hardens to form the remaining wall of the first manifold cavity and to seal the tubes to the torch body portion. The first material is then removed, providing a torch body portion having a manifold with tubes extending through it. A second manifold may then be assembled to the first torch body portion to provide connection to the tubes.

Abstract: An improved torch for the mixing of oxidant and fuel gases external to the torch, for exampled for use in chemical vapor deposition processes, and its method of manufacture are disclosed. A first torch body portion is formed having a manifold cavity with one side open. A number of tubes extend from passages formed in a torch face plate through the first manifold cavity. A first liquid material (such as wax) is poured into the cavity, such that its upper surface defines the desired inside wall surface of the first manifold corresponding to the open side. This material is allowed to harden. A second liquid material (such as epoxy) is then poured over the first material, and hardens to form the remaining wall of the first manifold cavity and to seal the tubes to the torch body portion. The first material is then removed, providing a torch body portion having a manifold with tubes extending through it. A second manifold may then be assembled to the first torch body portion to provide connection to the tubes.

Abstract: Pressure or strain sensitive optical fiber having a core, at least a portion of which has a predetermined refractive index for transmitting light therethrough, a cladding adjacent the core having a refractive index which is less than that of the core, and a concentric light transmissive layer adjacent the cladding having a refractive index which is greater than that of the cladding. The light transmissive layer has an internal diameter which is greater than the unperturbed mode boundary diameter of the core, such that all light passes through the core when the fiber is unperturbed. When the optical fiber is subjected to pressure forces in the form of stress or strain, light passes through the light transmissive layer in proportion to the amount of stress or strain acting upon the fiber. Also, pressor sensors and methods for measuring forces or pertubations utilizing such optical fiber.

Abstract: Elimination of shearing flow, having an inwardly radial flow and velocity gradient, of extrudable material entering a die for forming a honeycomb structure with a plurality of thin-walled cells, thereby avoiding irregularities in the extruded structure. The shearing flow, resulting from reducing cross-sectional area of a Bingham plastic material (e.g. a cordierite-forming, plastically moldable ceramic batch material) passing through a funnel section tapering inwardly from an extrusion barrel, is changed to plug flow by maintaining constant the reduced cross-sectional area through a straight-walled portion of an entrance cavity feeding the material to the die, which has passageways including a plurality of feed holes communicating with interconnected discharge slots sequentially in the extrusion detection for forming the honeycomb structure.

Abstract: An optical waveguide filament comprising a cladding layer, a core and a barrier layer disposed between the core and cladding. The barrier layer comprises silica doped with B.sub.2 O.sub.3, P.sub.2 O.sub.5 and GeO.sub.2. The core consists of an inner region and an outer region, the boundary between which is referred to as the core break-point. In the outer region of the core, the concentration of B.sub.2 O.sub.3 decreases linearly from its barrier layer level to zero at the core break-point, the P.sub.2 O.sub.5 increases at a rapid rate from the barrier layer level to a first concentration level at the core break-point and the GeO.sub.2 remains at a constant value between zero and the barrier level. In the outer region of the core, the GeO.sub.2 increases from some level up to the barrier layer level to a greater value at the filament axis in a power law fashion. The P.sub.2 O.sub.