Abstract: A roller pump in which one or more hoses is compressed against an arcuate stator bearing surface by a plurality of rollers carried by a rotating rotor. A shim is provided in generally opposing relation to the stator bearing surface to impart a hose compression offset force to the rotor. In this manner, the forces imparted to the rotor remain substantially constant throughout its rotation. In a preferred embodiment, a liner, which may be unitary with the shim, overlies the hoses to be compressed by the rotor to compensate for dimensional variations between the rotor rollers and for variations in the bearing surface and the hoses themselves. The thickness of the shim, at its region of greatest thickness, approximates the combined thickness of the hose, when fully compressed, and the compensating liner. Tabs are provided to extend from the shim to assist in maintaining the shim and liner in proper orientation relative to the hoses to be compressed.

Abstract: A body implantable medical infusion system including an infusate reservoir, a system for regulating infusate discharge and a catheter for delivery of discharged infusate to the desired infusion site. An unregulated infusate discharge is prevented, in a preferred embodiment, by a normally open valve positioned intermediate the pump and the catheter, the valve closing in response to the sensing of unregulated infusate. A sensor, to which the valve responds, may be positioned at the output of the pump or at any other location within the system to sense infusate leakage. The valve may be additionally closed in response to an externally generated signal.

Abstract: An identification device including a flexible securing element and a three-part composite tag connected to the securing element. The three-part composite tag includes a pair of outer elements of complementary elliptical configuration, and a central indicia-carrying element of elliptical configuration which is complementary to the outer elements. The elements of the tag are interconnected for pivotation about a common pivotal axis for movement from a registering, superimposed position to an expanded, separated relationship. The outer elements are at least partially transparent to permit visual observation of indicia on one or both of the opposite sides of the central element.