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Minimally invasive transvalvular ventricular assist device

A tiny electrically powered hydrodynamic blood pump is disclosed which occupies one third of the aortic or pulmonary valve position, and pumps directly from the left ventricle to the aorta or from the right ventricle to the pulmonary artery. The device is configured to exactly match or approximate the space of one leaflet and sinus of valsalva, with part of the device supported in the outflow tract of the ventricular cavity adjacent to the valve. In the configuration used, two leaflets of the natural tri-leaflet valve remain functional and the pump resides where the third leaflet had been. When implanted, the outer surface of the device includes two faces against which the two valve leaflets seal when closed. To obtain the best valve function, the shape of these faces may be custom fabricated to match the individual patient's valve geometry based on high resolution three dimensional CT or MRI images. Another embodiment of the invention discloses a combined two leaflet tissue valve with the miniature blood pump supported in the position usually occupied by the third leaflet. Either stented or un-stented tissue valves may be used. This structure preserves two thirds of the valve annulus area for ejection of blood by the natural ventricle, with excellent washing of the aortic root and interface of the blood pump to the heart. In the aortic position, the blood pump is positioned in the non-coronary cusp. A major advantage of the transvalvular VAD is the elimination of both the inflow and outflow cannulae usually required with heart assist devices.
Owner:JARVIK ROBERT

Process for precipitating compounds from zinc metal baths by means of a hollow rotary body that can be driven about an axis and is dipped into the molten zinc

InactiveUS6364930B1High acceleration of the metalRapid and highly effective separationHot-dipping/immersion processesSpecific fluid pumpsZinc metalLiquid metal
A process and device are disclosed for precipitating solid compounds from the liquid zinc or liquid zinc-based alloys of a metal bath. According to the disclosed process, partial amounts of the metal phase containing the compound(s) are exposed to an acceleration higher than the acceleration due to gravity and at least partially dissociated thereby into fractions containing heavier and/or lighter components. The molten mass depleted of solid compounds is returned to the metal bath and the part of the molten mass enriched with the desired compounds is discharged. The disclosed device is substantially characterized in that a hollow rotary body (2) is introduced into the molten mass (1). The hollow rotary body (2) can be driven about an axis and is fitted in the submerged or lower area with conveyor means (21) which project into the cavity. In its discharge or upper area, the hollow rotary body (2) is provided with at least one discharge opening (23) for the depleted molten mass (14) eccentrically arranged in its wall and with at least one further discharge opening (25) for the liquid metal enriched with the desired compounds centrally arranged and/or eccentrically arranged on the discharge side. At least one of the upper molten mass discharge openings (23, 24) in the rotary body (2) opens into a discharge area of a housing (3) which at least partially surrounds the rotary body (2).
Owner:ANDRITZ PATENTVERW GES

Automatic toilet flushing system

An automatic toilet flushing system for use with toilets in either commercial or private dwellings and which comprises a replaceable water tank top or tank lid carrying the major components of the automatic toilet flushing system. In this case, the toilet flushing system is an adaptive system, since it converts a conventional toilet into an automatic flushing toilet. The adaptive system also comprises a pair of infrared light sources and sensors located on forwardly protruding portions of the tank lid. The sensors are located forwardly of the water tank or water chest of the toilet and the timing is adjusted so that raising and lowering of the lid of the toilet seat will not interfere with operation of the sensors. A control circuit is also provided and mounted on the underside of the replaceable water tank cover plate. The circuit is connected to the sensors and operated by batteries so that when a light beam is interrupted for at least a predetermined time period, the control circuit will automatically initiate a flushing operation. The circuit initiates a flushing signal to a solenoid which shifts a connecting rod and which, in turn, is connected to a flapper valve at the lower end of the water chest. Thus, when the light beam is interrupted for the predetermined time period, the control circuit causes the solenoid to operate the rod which opens the flapper valve and thereby causes a flushing operation of the toilet.
Owner:GUROWITZ JOHN
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