Abstract: A medicament preparation system includes a water purification module and a medicament proportioning module that is interoperable with a replaceable fluid circuit. The fluid circuit includes a purified water inlet, a product medicament outlet, and a plurality of pumping tube segments. At least a first concentrate container is connected by at least a portion of the fluid circuit to the product medicament output and a first concentration measurement sensor station is positioned in a flow path. A controller is programmed to calculate iteratively a concentration of a first concentrate from the first concentrate container and the purified water from a signal generated by the first concentration measurement sensor station and to regulate one or both of a first pumping actuator engaged with the first pumping tube segment and a second pumping actuator engaged with the second pumping tube segment, responsively to the concentration of the first concentrate and water.

Abstract: The disclosed subject matter relates to extracorporeal blood processing or other processing of fluids. Volumetric fluid balance, a required element of many such processes, may be achieved with multiple pumps or other proportioning or balancing devices which are to some extent independent of each other. This need may arise in treatments that involve multiple fluids. Safe and secure mechanisms to ensure fluid balance in such systems are described.

Abstract: A kit for converting a Weedwacker into an outboard engine and a method of using the kit includes the steps of rotating the tubular housing of the Weedwacker through one hundred eighty degrees, replacing the grass cutting device with a propeller, replacing the muffler of the Weedwacker with an elongate exhaust tube, clamping the exhaust tube to the tubular housing, and mounting a swivel support bracket to the tubular housing.

Abstract: There is described a skate board having front and rear pairs of narrow runners or blades enabling use of the skate board on ice, and the edges on one of the pairs are less sharp than the edges on the other pair to permit lateral movement or sliding of one end of the board relative to the other.