Abstract: A knitted headband for use with a safety hat to provide cold weather protection for a wearer. The band is circumferentially stretchable, has open upper and lower ends, and is formed of double thicknesses of knitted material. The upper portion of the band is dimensioned and adapted to be stretched over a hard hat, and a pair of diametrically-disposed slits are formed in the band intermediate the length thereof for receiving front and rear brim portions of the hat to secure the band in place. The front slit and the open lower end of the band are provided with elasticized borders to permit adjustment of the band into different positions to provide greater or lesser protection depending on the severity of weather conditions.

Abstract: A catheter having at least two separate lumens, one for conveying liquids to and from a port spaced substantially from the distal end of the catheter and the other for enclosing an electrical conductor which extends to a point distal to the port. The two lumens are separated by a longitudinal septum and combine to perform a third function--that of containing a gas required in connection with the operation of a pressure responsive element adjacent the catheter's distal end. The septum is provided with an aperture through which the gas chamber or pathway switches from one lumen to the other. A sealant plug located in the lumen for liquid flow prevents contact between such liquid and both the electrical conductor and the gas within the pathway. Methods for forming such a catheter are also disclosed.

Abstract: A vascular prosthesis and its method of fabrication. The prosthesis takes the form of a flexible and conformable support tube having a luminal surface formed of a smooth, homogenous, and substantially non-thrombogenic hydrogel having relatively small pores or microvoids suitable for tissue ingrowth but resistant to thrombus formation, and having an outer surface formed of essentially the same hydrogel having a heterogenous microstructure which includes relatively large pores or macrovoids especially suitable for cellular ingrowth from perigraft sources and attachment sites. In one embodiment, the tubular substrate is foraminous and the inner and outer hydrogel layers merge through the interstices of the substrate to provide a unified ground substance characterized by strata having selectively different pore characteristics for promoting effective endothelialization and for reducing possibilities of thrombotic occlusion.

Abstract: A two-section implantable catheter for peritoneal dialysis is disclosed, the catheter having a retainer section which permanently ingrows into the abdominal wall and a catheter tube section. The two sections are normally connected together in a fluid-tight seal but may be separated to permit replacement of the tube section of an indwelling catheter without necessitating surgical removal of the retainer section.