Abstract: Method of operating a control device for controlling an infusion device A method of operating a control device (2) for controlling an infusion device (33) for administering a drug to a patient (P) comprises the steps of: providing a model (p) to predict a time-dependent drug concentration (Cplasma, Clung, Cbrain) in multiple compartments (A1-A5) of a patient (P); setting a target concentration value (CTbrain) to be achieved in at least one of the compartments (A1-A5) of the patient (P); determining a drug dosage (D1) to be administered to a first compartment (A1) of the multiple compartments (A1-A5) of the patient (P) using the model (p) such that the difference between the target concentration value (CTbrain) and a predicted steady-state drug concentration (Cplasma, Clung, Cbrain) in the at least one of the compartments (A1-A5) is smaller than a pre-defined threshold value (Ub-rain); providing a control signal (S1) indicative of the drug dosage (D1) to an infusion device (33) for administering the drug dosag

Abstract: In one embodiment, a volumetric pump in a medical fluid delivery system comprises at least one piston in a hollow cylinder, the pump having at least one inlet port through which a medical fluid can be sucked into a pump chamber during an instroke of said piston, and at least one outlet port through which the medical fluid can be expelled during an outstroke of the piston. The piston or the hollow cylinder can be actuated directly or indirectly by a rotor. This rotor transmits on the one hand a bi-directional linear movement to the piston or to the cylinder and on the other hand, a bi-directional angular movement either to the piston or to another ratable element in order to open and close alternately the inlet and outlet ports.

Abstract: A double-headed piston type compressor connected with an external device is provided. The compressor includes a plurality of cylinder bore pairs, double-headed pistons, a first rotary valve, a second rotary valve, first suction passages, and second suction passages. In each cylinder bore pair, a first time period from a first top dead center timing, which is timing when the double-headed piston reaches a top dead center in a first compression chamber, to a first communication start timing, which is timing when a first introduction passage starts to communicate with a first suction passage, is different from a second time period from a second top dead center timing, which is timing when the double-headed piston reaches a top dead center in a second compression chamber, to a second communication start timing, which is timing when the second introduction passage starts to communicate with a second suction passages.

Abstract: A fuel injection system in which only one pump element at a time can aspirate fuel. As a result, it is attained that even in partial-load operation, all the pump elements are in operation, and as a consequence the smooth operation of the engine in partial-load operation is improved.

Abstract: In a seal mechanism which constitutes a port switching portion in a pump mechanism of a paste ejection apparatus that ejects paste, and which prevents leakage of the paste from a seal portion between a plunger block rotating with a plunger and a fixed seal block (between a seal surface and a sliding surface), a housing portion is formed by opposing an outer surface provided for the seal block to an inner surface extending axially from the cylinder block, and a ring-shaped external seal member formed by combination of an O-ring and self-lubricant material such as PTFE is attached into the housing portion. Hereby, it is possible to prevent the paste that has leaked from the seal portion from leaking to the outside of the housing portion by the external seal member.

Abstract: A fluid translating device is provided that includes a first member having fluid inlet/outlet ports and a second member having a plurality of pistons disposed therein secured to a stationary central shaft. A camplate and port plate is disposed in the fluid translating device about the stationary central shaft and located between the first and second members. The camplate is in communication with the fluid inlet/outlet ports and the plurality of pistons is in mating contact with the port plate. An outer input/output member is secured about the camplate and is rotatably disposed about the first and second members to form a compact arrangement.

Abstract: Aspects of the present invention are directed to methods and apparatus for dispensing material onto substrates. A dispensing system is provided for dispensing a metered quantity of dispensing material onto a substrate. The dispensing system includes a dispensing pump, a container, coupled to the dispensing pump, to contain the material prior to dispensing, and a computer control system to control operation of the dispensing pump.

Abstract: A two-cylinder air compressor has a motor with a through drive shaft. Identical housings are provided at each end of a cylindrical spacer sleeve that surrounds the motor. The housings include cylinder housing extensions each of which mounts a cylinder sleeve, a valve plate, and a head. The heads are part of a one-piece cylinder head member. Wobble pistons are mounted on each end of the motor shaft and operate in the cylinder sleeves. The cylinder sleeves rest on a floor in the housing which has integrally formed passages for cooling air to circulate around the cylinder sleeves. The one-piece cylinder head member includes integral tubes connecting the heads. The integral tubes span the distance between the heads and are spaced from the outside of the spacer. The housings may be joined by through bolts or without bolts by press fitting the bearings in the housing, press fitting the housings to the spacer sleeve, and press fitting the motor shaft into the bearings.

Abstract: An air pump with dual air intakes includes a pump body having an enclosed end with a securing point at its inner side for retaining a diaphragm, and an open end connecting to a cover. The cover has a securing point at its inner side for retaining a diaphragm. The cover and the enclosed end are provided with multiple air inlets. The diaphragms may cover the air inlets. The cover has a central hole through which a piston rod passes. A piston is connected to an inner end of the piston rod and is provided with an annular groove with through holes communicating with the piston rod. The annular groove is fitted with an annular gasket. A pump head is connected to a projected end of the piston rod. The pump head is connected to an air outlet and a check valve communicating with the piston rod. When the piston displaces, air is drawn in via the ends of the pump body through the annular gasket and the annular groove into the piston rod via the through holes and is then discharged via the check valve and the air outlet.

Abstract: An air pump with dual air intakes includes a hollow pump body, a securing cover, a piston rod, a piston, an air outlet, a check valve, an air duct and a handle. The pump body has one end connected to the air outlet and the check valve. The peripheral rim of the pump body near the air outlet is provided with multiple air inlets. A diaphragm is disposed at the inner side of the peripheral rim. The other end of the pump body is connected to the securing cover provided with multiple air inlets. A diaphragm is secured to the inner side of the securing cover. Both diaphragms may cover the corresponding air inlets. The piston is connected to one end of the piston rod and is provided with an annular groove at its periphery. The annular groove has through holes communicating with the piston rod and is fitted with an annular gasket. The piston rod has fitted therein the air duct connecting to the air outlet. The other end of the piston rod projects from the pump body and connected to the handle.

Abstract: A tube switch for a double-cylinder sludge pump is provided including a swing pipe, a wearing ring and an elastic member. The swing pipe is adapted to swivel in front of a center plate and includes an extension portion having an inner surface. The wearing ring is supported between the end of the swing pipe and the center plate and is axially movable relative to the swing pipe. The wearing ring has a recess formed at one end thereof, defined by a sloped boundary surface. The swing pipe is adapted to receive the end of the wearing ring including the recess therein. The recess thus defines an annular space between the swing pipe and the wearing ring with the inner surface of the extension portion of the swing pipe facing the annular space. The elastic member includes a radial inner surface and a sloped front end surface that corresponds to the boundary surface of the wearing ring. The elastic member is supported between the swing pipe and the wearing ring within the annular space.

Abstract: A dual-acting, reciprocating piston pump is provided which comprises a pump body formed with a passageway having an inlet and a discharge outlet which receives a piston assembly including a plunger rod carrying a valve plate or spider, a shovel rod carrying a shovel disc and a rod connector formed with a valve seat which interconnects the plunger rod and shovel rod. A tubular check valve is carried on the rod connector between the valve seat and the valve plate in sliding contact with the internal wall in the pump body formed by the passageway, which divides the passageway into an upper pumping chamber communicating with the discharge outlet and a lower pumping chamber communicating with the inlet. A second check valve is located at the inlet to the passageway in the pump body and is movable between an open and closed position relative thereto.

Abstract: A manually actuated pump that dispenses liquid substances in measured quantities from the contents of bottles and containers which is comprised of a handle capable of being axially displaced against the action of a spring, a cylinder having a pump space whose volume is reduced on manual actuation of the handle, a feed tube connected to the cylinder, a piston driven by the handle that displaces the volume in the cylinder, and two valve-closing surfaces for alternately opening and closing the passage leading to the feed tube and the discharge duct contained in the handle so that only a known measured quantity of liquid will be dispensed from the bottle.

Abstract: A peristaltic pumping system in which a length of elastic tubing connected at opposite ends to storage spools is advanced alternately in opposite directions through a pinch roll pair and in which opposite ends of the elastic tubing are connected in fluid communication alternately with pump intake and pump discharge conduits by a reversing valve. The valve is adjusted by means dependent on the direction of tubing travel through the pinch roll pair. The system is preferably incorporated in a cassette-like enclosure which may be removable received in a drive console. Alternately, the system may be self-contained in an enclosure adapted to be implanted in an animal body.

Abstract: A compressor valve for use in a piston type compressor having an annular tapered shaped valve element spring-urged into a valve seat formed between the intake suction side of the valve body and an annular passage formed behind the seat which communicates with a central outlet passage formed in the exhaust side of the valve body. The piston in a compressor adapted to force fluid back through a plurality of inlet passages communicating with an annular passage which communicates with outlets in the valve body, said plurality of inlet passages being sealed by a spring-urged annular valve element. The piston sucks air into the inlet urging the first annular valve element off its seat to allow flow of the gas in through the outlet passage into the piston chamber. The piston then forces the air through the plurality of inlet passages urging the second valve element off its seat such that the gas flows around both the inner and outer sides of the valve element to the outlet of the compressor.