267results about How to "Reduce dead volume" patented technology

A fluid pump has a pump body and a displacer which is adapted to be positioned at a first and at a second end position by means of a drive, the displacer and the pump body being implemented such that a pump chamber is defined therebetween, and the pump chamber being adapted to be fluid-connected to an inlet and to an outlet via a first opening and a second opening which are not provided with check valves. An elastic buffer bordering on the pump chamber is provided. The displacer is implemented in the form of a plate which is secured to the pump body, and the pump body is provided with a recess defining the pump chamber. The drive acts on the displacer substantially in the area of the first opening. The displacer closes the first opening when it occupies its first end position and leaves the first opening free when it occupies its second end position. The drive means moves the displacer so abruptly from the second to the first end position that a deformation of the buffer means is caused by the movement of the displacer.

Catheter for monitoring the concentration of an analyte in a body fluid having an implantable distal area (7) for the uptake of body fluids and a proximal area (8) with an outlet opening (14), wherein the catheter comprises a catheter casing (1) having microopenings which are permeable to at least part of the body fluid and at least partially hold back corpuscular components, and a catheter core (2) which is located in the catheter casing (1). The catheter core preferably has a microstructure on its peripheral surface and / or the catheter casing has a microstructure on its inner wall which form a hollow space between the catheter core and catheter casing. Moreover the invention concerns a method for the manufacture of such a catheter.

A sweat sensing device includes a plurality of sweat collection pads communicating with a sensor. Each of the pads is activated by a timing circuit which allows one or more of the pads to be activated at a selected time and subsequent deactivated after a defined period of time. This allows for selective collection of sweat from a plurality of pads over a prolonged period of time. An impedance measuring circuit can be employed to determine if one or more of the pads becomes disconnected, in order to avoid irritation. Further, the devices can use a common microfluidic device which both transports sweat activating substance, such as pilocarpine, to the surface of the skin and directs sweat away from the skin to a sensing device.

The invention relates to a device for removing a fluid from at least one container (300), for example, from a vial, that has a seal that can be punctured. The device comprises a base body (210), in which a fluid channel is formed. In order to reduce the lost volume, a pin-shaped insertion element (250) that reduces the cross-section of the fluid channel is inserted into the fluid channel through an insertion opening. Locking structures (262, 263) that retain the container on the device in a removal position and in a storage position different therefrom can be provided so that the container can be stored on the device without the seal being punctured accidentally. Such a device can be used in particular to fill an applicator (100) having one or more fluid reservoirs from one or more vials.

The invention describes features that can be used to control flow to an array of microchannels. The invention also describes methods in which a process stream is distributed to plural microchannels.

A gas separation system includes a stator, and a rotor rotatably coupled to the stator, and at least one surge absorber in communication with the stator. The stator includes a stator valve surface and a plurality of function compartments opening into the stator valve surface. The rotor includes a rotor valve surface in communication with the stator valve surface, and a plurality of flow paths for receiving adsorbent material therein. The rotor also includes a plurality of apertures provided in the rotor valve surface and in communication with the flow paths for cyclically exposing the flow paths to the function compartments. The surge absorbers are configured to reduce pressure variations in the function compartments and to maintain each function compartment at one of a plurality of discrete pressure levels. In this manner, substantially uniform gas flow can be maintained through the function compartments and the flow paths without recourse to multistage compression machinery.

The present invention provides heat exchanging elements for use in Stirling engines. According to the present invention, the heat exchanging elements are made from muliple platelets that are stacked and joined together. The use of platelets to make heat exchanging elements permits Stirling engines to run more effiecient because the heat transfer and combustion processes are improved. In one embodiment, multi-stage combustion can be introduced with platlets, along with the flexibility to use different types of fuels. In another embodiment, a single component constructed from platelets can provide the heat transfer rquirements betweeen the combustion gas / working gas, working gas in the regenerator and the working gas / coolant fluid of a Stirling engine. In another embodiment, the platelet heat exchanging element can recieve solar energy to heat the Stirling engine's working gas. Also, this invention provides a heat exchanging method that allows for multiple fluids to flow in opposing or same direction.

Microfluidics packages and methods of use are described, comprising in one embodiment a substrate having a top surface and means to lower pressure on the top surface; a fluidics card having a bottom surface and means to allow fluids to traverse through the card; and a polymeric barrier film, the polymeric barrier film positioned between the top surface of the substrate and the bottom surface of the fluidics card.

An HPLC apparatus includes a heat exchanger formed from diffusion-bonded first and second titanium substrates. At least two conduits for counterflow are defined between the first and second substrates.

The present invention relates to a fluid sample transport device (1) with reduced dead volume for processing, controlling and / or detecting a fluid sample (3), comprising: a substrate (2), wherein the upper surface of said substrate (2) comprises at least one processing, controlling and / or detecting element (19); at least one flexible membrane (4), wherein the flexible membrane (5) is arranged on the upper surface of said substrate (2); at least one plunger (5) and / or actuating element (9) for actuating an up and / or down movement of the flexible membrane (4) to cause a fluid flow and / or to stop a fluid flow; at least one cover plate (6) arranged on the upper outer surface or lower outer surface of the flexible membrane (4), wherein the cover plate (6) comprises at least one through going hole (10) and / or cut-out (10) for receiving a plunger (5) and / or actuating element (9), so that movement of said plunger (5) and / or actuating element (9) causes a pump and / or valve action of the adjacent arranged flexible membrane area to cause a fluid flow between the upper surface of said substrate (2) and the lower surface of said flexible membrane (4); and wherein at least one channel (7) to direct the fluid sample (3) flow on the substrate (2) is temporally formed by the flexible membrane.

A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.

A fluid dispenser comprising a fluid reservoir of variable working volume, at least one deformable wall defining an inside surface, and a dispenser orifice through which the fluid is dispensed while the working volume of the reservoir is being reduced by deforming the deformable wall, the dispenser further comprising a piston element that is in leaktight sliding contact with the inside surface of the deformable wall, said piston element comprising an upstream face that is not in contact with the fluid, and a downstream face that is in contact with the fluid and that forms a displaceable wall of the reservoir, said upstream face being separated from said downstream face by a zone that is in leaktight contact with the inside surface.

A device for dispensing a liquid-to-pasty product to be placed at the open end of a rigid container and consisting of a manual metering pump for dispensing a predetermined amount of the product to be dispensed, includes a base member to be placed on the container, a push button provided with a dispensing spout capable of acting, when pumped, against an intermediate bellows comprising an opening / closing device provided at the upper end of the bellows, characterized in that the push button is combined with a cylindrical chamber directed towards the inside of the bellows and extending inside the bellows so as to form a dead volume with a predetermined value inside same and to accordingly reduce the available air volume, thereby improving the compression rate when pumped.

In injecting a sample sucked into a sample loop in an autosampler from an injection needle into an analytical flow path via an injection port by a mobile phase, a sending flow rate of the mobile phase is reduced from a certain flow rate determined in an analysis condition to reduce pressure applied on a joint section between the needle and the injection port to thereby reduce the sample remaining in the injection port.

A condenser for a vehicle is used in an air conditioning having an expansion valve, an evaporator, and a compressor, is provided between the compressor and the expansion valve, and circulates coolant supplied from a radiator to condense refrigerant supplied from the compressor through heat-exchange with the coolant and the refrigerant.The condenser may include a first heat-radiating portion connected to the radiator to circulate coolant and adapted to circulate refrigerant to condense the refrigerant through heat-exchange, a second heat-radiating portion formed at a lower portion of the first heat-radiating portion, a receiver-drier portion disposed apart from the first and second heat-radiating portions to perform gas-liquid separation and moisture removal of the condensed refrigerant, and a lower cover to connect the second heat-radiating portion with the receiver-drier portion, wherein the connecting passage is adapted to flow the refrigerant from the receiver-drier portion into the second heat-radiating portion.

Low profile inlet valve embodiments for a piston pump therapeutic substance infusion device are disclosed that reduce dead volume, occupies little residential space, operates rapidly, and have many other improvements. The therapeutic substance infusion device has a housing, a therapeutic substance reservoir, a power source carried in the housing, electronics, a piston pump, and an inlet valve. The piston pump is configured for pumping therapeutic substance from the therapeutic substance reservoir through an infusion port at a programmed rate. The inlet valve is in fluid communication with a reservoir outlet to control the flow of therapeutic substance into the piston pump. The inlet valve has a substantially coplanar valve surface and valve spring. Many embodiments of the low profile inlet valve and its methods of operation are possible.

The invention relates to an LC / MS interface provided with structure that the end of a spray capillary is rarely damaged and the object is to provide the LC / MS interface which a general user can easily operate, which inhibits the extension of a separation band and the deterioration of detection sensitivity and which enables high separation and sensitive analysis. A metallic member having a hole for connecting a separation column and a spray capillary and a resin member for fixing the upstream side of the short spray capillary are used. Further, to enhance operability, spray ionization using gas spraying is used.

The present invention features a fuel cell stack that preferably includes an electricity generating assembly having a plurality of unit cells that are suitably disposed one after another; a pair of end plates pressedly disposed respectively at upper and lower ends of the electricity generating assembly; and a joining device suitably engaging the end plates by a rope, where pressure is applied to the electricity generating assembly by means of tension of the rope, and the length and tension of the rope is suitably controlled.

A fluid delivery device is provided which comprises a microchannel device for cutting out a certain amount of a sample from a micorochannel by controlling a valve opening. The fluid delivery device has a valve for controlling a flow of a fluid, comprising a flow channel for the fluid, and a valve in the flow channel, wherein the valve operates in accordance with a pressure difference between the upstream side and downstream side of the valve caused by the flow of the fluid through the flow channel, allowing the fluid to flow when the pressure difference is lower than a prescribed value P0, and intercepting the fluid not to flow when the pressure difference is P0 or more.

According to one embodiment of the invention, an engine system comprises a housing, an outer gerotor, an inner gerotor, a tip inlet port, a face inlet port, and a tip outlet port. The housing has a first sidewall, a second sidewall, a first endwall, and a second endwall. The outer gerotor is at least partially disposed in the housing and at least partially defines an outer gerotor chamber. The inner gerotor is at least partially disposed within the outer gerotor chamber. The tip inlet port is formed in the first sidewall and allows fluid to enter the outer gerotor chamber. The face inlet port is formed in the first endwall and allows fluid to enter the outer gerotor chamber. The tip outlet port is formed in the second sidewall and allows fluid to exit the outer gerotor chamber.

A medical unit includes a shielded enclosure (2) in which are accommodated:—elements (13) for supporting a container (12) including a source or a generator of injectable radioactive product (11),—elements (10) for supporting a syringe (6),—a device (3) of the activimeter type, and—a system of pipes (9, 20, 23, 24) associated with at least one valve (15). The syringe support (10), the valve (15) and the radioactive source support (13) are arranged vertically relative to one another, respectively from top to bottom, the syringe support (10) being arranged to support the syringe (6) with the plunger (8) thereof oriented upward. The valve (15) and the syringe plunger (8) can be operated so as to ensure the withdrawal, dilution and injection operations.

A fuel pump assembly has a bushing defining a pumping chamber, a plunger, a cam follower piece, and a compliance device for absorbing noise by increasing either or both of a hydraulic and / or a mechanical compliance of the fuel pump assembly. The compliance device may includes a spring washer or a press-fit spring. The pump bushing and / or plunger may include a cavity as the compliance device for increasing dead volume, the cavity being in fluid communication with the pumping chamber via an orifice. A deflectable or movable mechanism is positioned within a cavity for increasing dead volume, and a solenoid varies a diameter of the orifice. The moveable mechanism includes a poppet valve having a switching pressure related to engine speed. A vehicle includes an engine, transmission, fuel rail, and a fuel pump assembly configured with at least one compliance device for absorbing a hydraulic noise component.

A device for blowing, with the aid of a pressurized fluid, containers from thermoplastic blanks closed in a blow mold including a nozzle whose end is functionally and sealingly connected to the neck of the blank and includes several solenoid valves for selectively connecting the nozzle to the source of a moderately pressurized pre-blowing fluid, to the source of a highly-pressurized blowing fluid and to an exhaust for discharging the pre-blowing / blowing fluid, respectively. The inventive device also includes a body which is mechanically associated with the nozzle, incorporates at least one reception area for receiving a solenoid valve and is selectively connectable to the nozzle.

The invention relates to a disposable breast cup set which comprises a coupling element (2) to be coupled to a milk collection receptacle (1) and a breast cup connecting element (3) to be coupled to a breast cup funnel (5). The coupling element (5) and the breast cup connecting element (3) are interlinked via a tamper-evident element (4), said connection being destroyed when the coupling element (2) is for the first time separated from the breast cup connecting element (3) and preventing re-use of the set.

The present invention is directed to reduce the dead volume in a flow path with trap functions. A flow path switching valve 1 is provided, which includes a rotor, i.e., rotor 3, and a housing top 9 having four ports 7a-7d connected to external flow paths, wherein two ports used for a mobile phase for analyzing are an inlet port 7a and an outlet port 7b, and the other two ports used for a mobile phase for condensing are an inlet port 7c and an outlet port 7d. In the rotor 3, two circular arc-shaped rotor trenches 11a, 11b for communicating two ports are formed at positions corresponding to the ports 7a-7d. The rotor trench 11b is filled with an adsorbent.

Device for moulding thermoplastic containers by blow-moulding hot preforms, comprising a mould (1) and blow-moulding means (2) comprising a bell nozzle (8) which is axially displaceable between a raised position and a blow-moulding position in abutment against the mould; the driving means comprising mechanical means (12) with a cam follower roller (13) / cam (14) and pneumatic means (16) with a piston (18) integral with the upper end of the nozzle and sliding in a fixed enclosure (17), defining therein an upper chamber (19) connected to a source (24) of control fluid and a lower chamber (20) connected to this source and to the upper chamber via a solenoid valve (26); the upper face of the piston has a surface area which is greater than that of its lower face and that of the bell (9) of the nozzle.

The invention provides a method for producing rosin by turpentine, which comprises the following steps of melting, clarifying and distilling. The melted turpentine liquid is pressed in at least two higher-placed furnaces by vapor pressure in the melting process. The subsequent clarifying process is performed after the melted turpentine liquid is stayed in the higher-placed furnaces. The rosin product obtained by the method of the present invention can reach the grade of national superfine standard.