Abstract: A device for hydrodynamic, in vitro testing of heart valve prostheses. The device has a flow channel in which a flow of desired characteristics is induced. The flow channel includes a test fixture for supporting a prosthesis to be tested in a desired orientation within the flow. In a preferred embodiment, the test fixture includes first and second chambers spaced from each other along the flow channel and a shuttle intermediate the chambers which is movable between at least first and second positions. The shuttle includes at least one support for a heart valve prosthesis and selectively positions that prosthesis in the desired orientation within the flow by movement between the first and second positions. The shuttle may carry two or more heart valve prostheses to alternatively positioned one of them within the flow by movement of the shuttle.

Abstract: A winch control system for a crane or the like; the winch including a rotatable spool. A motor is connected for rotating the spool while a dual state brake is connected to prevent spool rotation in one state while permitting spool rotation in its other state. A power source provides energy to drive the motor and to change the state of the brake. Control elements selectively interconnect the power supply with the brake and motor, the interconnection of the power supply and motor being responsive to the interconnection of the brake and power supply.

Abstract: An absorbent quantitative test device in the form of a flat patch. When placed on the skin of a subject; the device collects a fixed volume of sweat. It is particularly intended to be used in screen testing for cystic fibrosis by measuring the chloride level in sweat and providing a visual indication when the level is in excess of a predetermined concentration. A fill tab indicator undergoes a color change when the fixed volume of sweat has been collected signifying completion of the test. The device includes two concentric circular reaction areas of chemically treated absorbent paper or the like. The sweat sample is introduced into the device at the center of the first or inner circular reaction area which contains a chemical composition capable of reacting with all chloride in the sweat sample below a predetermined concentration value to screen out that amount of chloride.

Abstract: A monospecific antibody prepared in response to cathepsin B proteinase by homogenizing purified cathepsin B proteinase upon dialyzing to remove ampholines, injecting a proteinase emulsion intramuscularly into an animal, reinjecting the animal with the proteinase emulsion, with drawing blood of the animal after sufficient time elapse for antibody production and isolating the monospecific antiserum from the blood.

Abstract: A body stimulation system including external components for generating and transmitting programming signals and implantable components including a signal generator with at least one alterable operating characteristic, a stimulation signal delivering system and circuit responsive to receive programming signals for establishing the operating characteristic in predetermined correspondence therewith. The stimulation signal delivering system is connected to the operating characteristic establishing circuitry for receiving the programming signals. In a preferred embodiment, the external components are prevented from transmitting programming signals during a stimulation signal and, more preferably, for a predetermined period following a stimulation signal. The predetermined period may be established such that the external system is activated during the refractory period of the tissue being stimulated.

Abstract: A model internal-combustion engine having a rotatable shaft driven by an engine, a propeller secured to said shaft, and a self-starting mechanism in the form of a cylindrical hub mounted coaxially on the shaft against the propeller and having at one end an axially extending drive element at its periphery by means of which it drives the propeller and ramp-defining walls adjacent a spring-engaging element at its other end, and a helically wound spring surrounding the shaft, anchored at one end to a stationary part of the engine, and having a free end bearing against the hub with a hook formed thereon to automatically engage the spring-engaging element of the cylindrical hub and energize the spring when the propeller and hub are rotated in a contra-normal direction and to otherwise ride on the ramps of the hub in non-engaging relation to its spring-engaging element.

Abstract: A hit indicating system for a multiple target shooting range including individual normally closed impact sensor switches associated with each target and a conductor connecting each of the impact sensors in a series array. Discrimination and logic circuitry are provided for discriminating between hits and "friend" and "foe" targets and for indicating which one of several "friend" or "foe" targets has been struck when the system is used in a night fight simulation mode.

Abstract: A flexible pin which is used with a tubular hollow member is disclosed herein. The flexible pin is made from a reel of beryllium copper integral parts having the blades or fingers extending from a barrel shaped member having each finger bent toward the other about a first radius and upon each finger being formed to the tangent of a second and shorter radius, conforming the fingers to the second radius until the tips of the fingers approach each other. The transverse projection of the fingers is greater than the barrel diameter.

Abstract: An improved electronic key for use in combination with an electrical receptacle adapted to receive the key wherein switch contacts on the key are designed for making electrical contact with corresponding receptacle contacts when the key is turned in the receptacle to an "on" position only after the other key contacts make electrical contact with the corresponding receptacle contacts. Conversely, the switch contacts are the first to break electrical contact when the key is turned past the "on" position in either direction.

Abstract: Disclosed is a vehicle carrying a grinder-mixer providing a low bin profile and improved mixing through the use of complementing horizontal and vertical circulatory paths of the ground feed, which is produced by a pair of cooperating parallel auger conveyors extending in a horizontal plane along the bottom of the mixing bin in side by side relationship and rotating so as to move the feed in opposite directions, each feeding the other, in cooperation with a pair of vertical cooperating augers spaced axially of the horizontal augers and moving and mixing the ground feed along a circulatory path in vertical planes, the said horizontal and vertical circulatory paths intersecting to thereby greatly increase the mixing action. One of the horizontal augers is connected to a discharging system and is reversible to cooperate with the latter to empty the bin.

Abstract: Electrochemical cells and batteries incorporating iodine-containing cathode materials and cathode current collectors having an interposed viscous fluid layer containing dissolved iodine.

Abstract: A narrow-base terracing plow comprising a tractor-borne transverse frame supporting a pair of transversely spaced rearwardly and outwardly extending gangs of inwardly directed disc harrows, each gang being pivotally mounted on a mounting bracket for vertical swinging movement relative thereto and the mounting bracket being mounted on said frame for swinging movement about a vertical axis, each gang having a rigid link pivotally connected thereto and to the frame and having a hydraulic cylinder extending between its mounting bracket and the medial portions of the gang by means of which the outer end portion of the gang can be forced downwardly into the soil to a greater extent than its innermore portions, thereby causing the soil through which it passes to be moved laterally toward the centerline until a terrace is formed between the gangs and peaks thereat.

Abstract: A thread looping machine having a frame mechanism with a longitudinal guideway over which a carriage slidably moves and supports a dependent member for holding a vise to secure the work so that a bail mechanism receives thread under tension that has been coated with an adhesive substance, and a drive mechanism rotates the bail mechanism to form successive loops around the work being held in the vise to secure the same.

Abstract: An implantable device for providing communication between interior structures of the body and the exterior of the body, the device comprising a rigid tubular member of biologically compatible material including a transcutaneous stem portion defining a stem cavity therein and a plurality of subcutaneous arm portions in fluid communication with the stem portion. A septum closure in the stem cavity provides an interruptable seal between the stem cavity and each of the arms, permitting the arms to be separately accessed by a cannulae or needle.