Abstract: A vacuum chamber may include an ambient side and a vacuum side. The vacuum chamber may be configured to carry a feedthrough that may include a hollow tube, a first O-ring captured by a first recess within the hollow tube and a rod extending through the hollow tube. The outer circumference of the rod may be configured to contact an entirety of an inner circumference of the first O-ring. A vacuum fitting having an inner circumference may be fixedly secured to the hollow tube. The rod may be operable to be linearly movable within the hollow tube and may be rotatably movable about an axis within the hollow tube. An object may be secured to the rod and may be linearly and rotatably moved within the vacuum chamber.

Abstract: A dual acting pressure boosting liquid partition device (2) and system, including a hollow cylinder housing (20) having a longitudinal extension, the cylinder housing (20) having at least a first part and a second part having a first transverse cross sectional area (a1) and a third part having a second transverse cross sectional area (a2) of different size than the first transverse cross sectional area (a1), a rod having a cross sectional area corresponding to the first transverse cross sectional area (a1), the rod further having a protruding portion (30) having a cross sectional area corresponding to the second transverse cross sectional area (a2), and the protruding portion and the third part of the cylinder housing (20) defining a first outer chamber (44?) and a second outer chamber (44?).

Abstract: The invention relates to a membrane pump device 2 for conveying fluids, in particular medical liquids for blood treatment. The invention furthermore relates to a membrane pump with a membrane pump device 2 and an actuating device 1 for the membrane pump device 2. The membrane pump device 2 has a pump chamber body 253 in which a recess, which is closed by an elastic membrane 201 to form a pump chamber 252, is constructed. The membrane pump device 2 moreover comprises an inward flow path 219 which connects an entry connection 204 to an inlet opening 215 of the pump chamber 252, and an outward flow path 223 which connects an outlet opening 216 of the pump chamber 252 to an exit connection 205. An inlet valve 202 is provided in the inward flow path 219 and an outlet valve 203 is provided in the outward flow path 223.

Abstract: A screw compressor for a utility vehicle includes at least one housing and at least one air-oil separator holder arranged at the housing. The air-oil separator holder is manufactured from a non-corrosive material. A relief valve is provided, which is arranged in the air-oil separator holder and by which the interior of the screw compressor can be relieved of pressure.

Abstract: An accumulator includes a pressure vessel including a first section and a second section joined to each other via a joint portion and a partition portion separating an interior space of the pressure vessel into a liquid chamber and a gas chamber so that a volume ratio between the liquid chamber and the gas chamber in the pressure vessel is variable. The first section includes a thread portion for fastening the accumulator to a support member. The second section includes an abutting portion disposed opposite to the thread portion across the joint portion in an axial direction of the thread portion and configured to abut on the support member when the accumulator is fastened to the support member.

Abstract: Implementations described and claimed herein provide systems and methods for palpation training. In one implementation, a system for medical procedure simulation includes an examination model, a sensor network, and a computing device. The examination model has a plurality of anatomical structure models, and the sensor network has a plurality of sensors. Each of the sensors is associated with one of the plurality of anatomical structure models and configured to capture examination data. The computing device is in communication with the sensor network and configured to generate feedback for an accuracy of a medical examination using the examination data.

Abstract: A peristaltic transport device comprising a tube member having an inner space to receive material, the member includes a series of repeating sections wherein each of the sections includes a plurality of bladders to selectively occlude portions of the inner space according to a defined peristaltic sequence to transport the material through the inner space. An actuator assembly is coupled to the tube member to control the selective occlusion of the inner space by selectively expanding and contracting ones of the plurality of bladders according to the defined peristaltic sequence. The actuator assembly simultaneously controls corresponding ones of the plurality of bladders across the series of repeating sections.

Abstract: A vehicle on-board charging assembly includes at least one power electronics module and a coolant channel in thermal contact with the at least one power electronics module. The charging assembly also includes a first reactive portion along a wall of the coolant channel defining a first reactive property and a second reactive portion along the wall of the coolant channel defining a second reactive property. The charging assembly further includes a plurality of emitters arranged to activate the first and second reactive portions. The charging assembly also further includes a controller programmed to sequentially activate the emitters to cause peristaltic pumping of coolant through the coolant channel.

Abstract: A reciprocating pump includes: a housing with a suction port and a discharge port; a reciprocated member disposed in the housing to form a pump chamber and reciprocable such that fluid is sucked into the pump chamber through the suction port and then discharged from the pump chamber through the discharge port; an actuator configured to reciprocate the reciprocated member; and a pressure gauge with a pressure receiving portion, configured to detect pressure of the fluid in the pump chamber through the pressure receiving portion, and coupled to the reciprocated member to be reciprocated by the actuator integrally with the reciprocated member.

Abstract: A method for conveying blood or priming liquid as a medium using a blood pump, measures gas in the medium in a feed line to the pump, in or on the pump, and the pump power is increased only for a short time as a function of the measured gas. A blood pump, in particular a centrifugal pump or diagonal pump, includes a rotor, a housing and a drive, the pump including a gas detector which acts upon the drive when gas is detected.

Abstract: Disclosed is a pressure tolerant seismic source for deep water survey. The seismic source can include an electromagnetic coil for generating an electromagnetic pulse, a piston plate movable by said electromagnetic pulse, and a housing with a first chamber and a second chamber separated by each other via a common bulkhead arrangement. The seismic source can also include that the coil is arranged within the first chamber and the piston plate arranged within the second chamber. The seismic source can also include the second chamber is at least partly filled with a liquid coupled to the plate so that due to movement of the plate at least one pressure pulse is generated traveling through the liquid within said second chamber.

Abstract: An electronic smoking article is disclosed, which includes an outer housing extending in a longitudinal direction; a micro pump system configured to pump a liquid material contained within a liquid supply reservoir through an outlet of the supply reservoir into a capillary; the capillary having an inlet and an outlet, the inlet in communication with the outlet of the liquid supply reservoir; a heating arrangement operable to heat the capillary to a temperature sufficient to at least initially volatilize the liquid material contained within the capillary; a power supply operable to apply voltage to the micro pump gas cell to generate a gas to drive the liquid material out of the liquid supply reservoir into the inlet of the capillary; at least one air inlet; and whereby air is mixed with the volatilized material to form an aerosol.

Abstract: A system can include a sampler assembly configured to collect a viscous sample at a first location. In implementations, the viscous sample includes concentrated sulfuric acid (e.g., greater than about 75% H2SO4). The system can also include a valve coupled with the sampler assembly for receiving the viscous sample. The valve is configured to couple with a source of a diluent and a sample transfer line. The system further includes a pump coupled with the valve for injecting the diluent into the sample transfer line along with the viscous sample to dilute the viscous sample and transport the diluted sample to a second location remote from the first location via the sample transfer line. In implementations, the sample transfer line is at least approximately two meters in length.

Abstract: An organ support apparatus includes: (a) a fluid circuit defining upstream and downstream legs adapted to be connected to an organ to be supported; (b) a circulation pump connected to the fluid circuit for circulating a process fluid through the fluid circuit and the organ; and (c) a first waveform generator connected to the fluid circuit for impressing a preselected pressure waveform on the process fluid.

Abstract: The present technology relates generally systems and methods for providing motion amplification and compensation by fluid displacement in fuel injector systems. For example, some embodiments of gaseous fuel injectors include a piezoelectric actuator and a motion transfer system coupled to the piezoelectric actuator. The motion transfer system includes a housing, a first piston having a first effective area disposed in the housing, and a second piston having a second effective area disposed in the housing. The second effective area is less than the first effective area and the first and second pistons define a fluid chamber therebetween. The motion transfer system can amplify actuation of a fuel injector valve.

Abstract: A powder feed apparatus for a powder spraycoating equipment includes a dense phase powder pump fitted with at least one, or two feed chambers. Each of the feed chambers includes at one chamber end a powder intake valve and at the opposite chamber end a powder outlet valve and further includes at least one air exchange aperture to alternatingly apply compressed conveying air or a partial vacuum to the feed chamber. The apparatus further includes an integral structural block. The structural block includes the feed chambers and first control valves connected in fluid communication to at least one of feed chambers for the purpose of applying compressed conveying air and a partial vacuum to it. The first control valves are directly connected, in fluid communication via ducts constituted in the structural block, to at least one of the feed chambers.

Abstract: A pumping cassette, the cassette includes a housing. The housing includes at least one fluid port and at least one air vent port. The air vent port vents a fluid source outside the housing. The pumping cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pump pumps fluid.

Abstract: A diaphragm vacuum pump has an electrically operated drive unit and a vacuum diaphragm, which separates a pump chamber into a drive-side part and a drive-remote part and which can be deflected by means of a movable part of the drive unit. The drive unit is an electromagnetic drive unit and the vacuum diaphragm is deflected in the direction of a linear movement generated electromagnetically in the drive unit. Preferably, a ventilation valve is also actuated the movable part. The vacuum pump is relatively small and compact and operates quietly. The vacuum pump is suitable in particular for “hands-free” applications of breastpumps.

Abstract: The RIBBON TRANSDUCER AND PUMP APPARATUSES, METHODS AND SYSTEMS include, in various embodiments, a variety of mechanisms comprised of components that include flexible elements with persistently strained deformations. Under operation, the deformations may be reconfigured via actuation to produce useful work, or may be reconfigured when subjected to external forces, such as from flowing fluid. The external energy input used to reconfigure these deformations may be harnessed and converted into electrical energy or may be converted into useful mechanical work, such as pumping.

Abstract: Reciprocating fluid pumps include a plunger configured to expand and compress in a reciprocating action to pump fluid, and one or more magnets carried by the plunger. The one or more magnets may be used to impart a force on the plunger when the plunger expands and compresses in the reciprocating action within a pump body responsive to a magnetic field. Shuttle valves for shifting flow of pressurized fluid between at least two conduits include a spool movable within a valve body and one or more magnets carried by the spool. The one or more magnets may be used to impart a force on the spool responsive to a magnetic field. Reciprocating fluid pumps may include such shuttle valves. Methods include forming and using such pumps and shuttle valves.

Abstract: Embodiments of the invention relate generally to devices and methods for pumping and controling the flow of a fluid. More particularly, embodiments of the invention relate to capacitive pumping and flow control devices and methods. In one embodiment, the invention provides a pump system having an inlet valve, an outlet valve, and a chamber between and in communication with each of the inlet valve and the outlet valve, the chamber having at least one elastic surface, wherein the chamber will dilate in response to a fluid exerting a pressure on the elastic surface, contain a quantity of the fluid when so dilated, and discharge the quantity of the fluid through the opened outlet valve.

Abstract: A valve body for pumps has a compressed air-filled chamber in the center thereof and a compressed air supply port through which compressed air is supplied into the compressed air-filled chamber. The outer surface of the valve body is provided with an annular groove-shaped air supply chamber that communicates between the compressed air-filled chamber and a pump-side air chamber. Compressed air supplied into the compressed air-filled chamber through the compressed air supply port is supplied into the pump-side air chamber through the air supply chamber.

Abstract: In a chemical liquid supplying apparatus, discharge accuracy of chemical liquid is enhanced, and durability of a flexible tube is enhanced. By the flexible tube incorporated into a pump housing, an interior of the pump housing is partitioned into a pump chamber, which communicates with a liquid inlet and a liquid outlet, and a drive chamber in which an incompressible, indirect medium is enclosed. Outer surfaces of end portions of the flexible tube are sealed by outer seal members, and their inner surfaces are sealed by inner seal members. Fastening cylindrical bodies disposed in the end portions of the flexible tube are radially expanded by wedge sleeves, whereby the outer and inner seal members are caused to closely contact with the flexible tube.

Abstract: A bi-directional continuous peristaltic micro-pump is described. The micro-pump comprises: a substrate, an actuating mechanism and a fluid channel. The actuating mechanism comprises: a first slanted membrane the thickness of which increases progressively from left to right, a first chamber formed between the first slanted membrane and the substrate; and a second slanted membrane, the thickness of which decreases progressively from left to right, the second slanted membrane being located to the first slanted membrane's right side and parallel to the first slanted membrane with a space between the two membranes, a second chamber formed between the second slanted membrane and the substrate. By inflating the first chamber and the second chamber, the first slanted membrane and the second slanted membrane generate a continuous sweeping motion to force the working fluid to flow.

Abstract: A multilayered impedance pump is formed by an inner tube and an outer tube which have different mechanical characteristics. The outer tube is relatively stiff, and can be used for a structural material. The inner tube is excitable, and a gel is placed between the inner and outer tube. The actuator actuates the gel to cause pressure waves along the inner tube.

Abstract: Transfer pump for high-pressure petrol injection of the type including a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of the bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby the fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein elements are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of the piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: A chemical liquid supplying apparatus capable of discharging chemical liquid with high accuracy and monitoring a leakage of an incompressible medium from a region between a piston and a cylinder is provided. A pump has a flexible tube for partitioning a pump chamber and a drive chamber, and the incompressible medium is supplied to the drive chamber by the piston reciprocating within a cylinder hole of the cylinder. A first bellows cover for forming a first seal chamber is provided between a large-diameter piston portion and the cylinder, and a second bellows cover for forming a second seal chamber is provided between a small-diameter piston portion and the cylinder. To detect pressure of the incompressible medium enclosed in the seal chambers, a seal-chamber pressure sensor is attached to the cylinder, and a deterioration degree of seal members is determined by detecting the pressure.

Abstract: Disclosed is a pumping system comprising a pump having a rigid outer casing defining an interior space and a tube structure in the interior space, the tube structure being flexible and substantially inelastic. The interior of the tube structure defines a pumping chamber for receiving pumped fluid. The tube structure is movable between laterally expanded and collapsed conditions thereby providing discharge and intake strokes. The pumping chamber receives pumped fluid to cause the tube structure to move towards the expanded condition and undergo an intake stroke. The pumping chamber—undergoes a discharge stroke upon collapsing of the tube structure. The pumping system also comprises a delivery means and a supplying means for delivering pumped fluid to the pumping chamber and for supplying actuating fluid to an actuating region around the tube structure in timed sequence to cause the tube structure to undergo discharge and intake strokes.

Abstract: A medical fluid machine includes a housing providing a first wall and a second wall, the first and second walls at least partially defining a pump chamber. A fluid receptacle is located within the pump chamber, the fluid receptacle including first and second flexible membranes configured to be moved apart to accept a medical fluid and moved together to dispel the fluid. A medical fluid outlet is in communication with the fluid receptacle. A first valve arrangement is configured to enable medical fluid in a sufficiently air-free condition to be delivered from the receptacle through the medical fluid outlet to a patient. A second valve arrangement is configured to enable medical fluid with entrained air to be delivered instead from the receptacle through the medical fluid outlet to an entrained air destination.

Abstract: The present invention involves, in some embodiments, mechanisms and methods of occluding collapsible tubing with an occluder to prevent fluid flow therethrough. In some embodiments, a tube occluding mechanism is disclosed that includes a bendable occluding member for creating a force that can be applied to a collapsible tube to occlude the tube. In some embodiments, the collapsible tube can be an inlet/outlet tube on a removable pumping cartridge that is coupled to a reusable pump drive component when the system is in operation. In such embodiments, the occluding mechanism can be attached to the reusable component and can be used to block fluid flow to and from the pumping cartridge. In some embodiments, the occluding member can comprises a spring plate which can create a force to occlude tubing when in a relaxed, unbent configuration, and which can be bent to unocclude the tubing.

Abstract: A technique is provided for pumping fluids in a subterranean wellbore. A submersible pumping system can be deployed in a wellbore for moving desired fluids within the wellbore. The pumping system energizes the desired fluid movement by reciprocating a working fluid between expandable members.

Abstract: A rolling diaphragm pump includes a housing, a rolling seal diaphragm disposed in the housing, a piston for driving the diaphragm, and a valve for regulating the flow of working fluid in a portion of the housing. A constant differential pressure is maintained across the diaphragm independent of discharge pressure of the pump. A method of pumping a viscous medium includes pumping the viscous medium by maintaining a constant differential pressure across a rolling seal diaphragm independent of discharge pressure of the viscous medium, with the diaphragm disposed between the viscous medium and a working medium and being driven by a piston.

Abstract: A transfer pump for the injection of fuel under high pressure of the type comprising a piston (10) providing the hydraulic liquid to a deformable bellows (14), the deformations of said bellows (14) in a cylindrical chamber (20) filled with fuel giving rise to a high pressure pumping effect of said fuel; a cam (5) provided with lugs (6) carried by a drive shaft (1), is characterized in that the oil portion of the pump comprises: the portion of the drive shaft (1) bearing the cam (5); the cam (5) and its lugs (6); the roller (7) with its shaft (8) and its roller bearing (9) carried by a bearing member (12), by which roller the cam(5) bears on the piston (10); as well as the upper portion of said piston (10); such that all the mechanical drive portion and angle change are bathed in the oil of the oil portion.

Abstract: A submersible pumping system comprises a piston that is axially moveable relative to a body between an extended position and a retracted position. A pump valve is coupled to the body and in fluid communication with a supply of operating fluid. The pump valve has a first position, where the pump valve supplies operating fluid so as to move the piston to the extended position, and a second position, where the pinup valve supplies operating fluid so as to move the piston to the retracted position. The pumping system also comprises an upper stop that is coupled to the pump valve so that the pump valve is moved to the first position when the upper stop is engaged by the piston in the retracted position. The pumping system also comprises a lower stop that is coupled to the pump valve so that the pump valve is moved to the second position when the lower stop is engaged by the piston in the extended position.

Abstract: Methods and apparatus employing inert gases injected into the lower level of sloping underground oil-bearing formations as a driving mechanism and water injected into the upper level of the formations as a gas blocking mechanism for increasing and extending the production of oil from underground formations is described. Also described is an inert gas oil production system comprising an exhaust gas processing system, a well inert gas and water injection system, an oil production well system, and a fuel gas generator. A hydraulically operated crude oil pump is also described.

Abstract: A hydraulic pump for injecting a predetermined amount of a fluid product into a line carrying fluid that is subject to cyclic pressure. A chamber has a rigid outer wall adapted to be fluidly coupled to the line. A flexible bladder positioned within the chamber forms a cavity between the bladder and the outer wall of the chamber. The outer wall of the chamber has a first opening and a second opening, both the first opening and the second opening being in fluid communication with the cavity, the first opening adapted to be fluidly coupled to the fluid product, the second opening adapted to be fluidly coupled to the line. The flexible bladder is responsive to fluid pressure in the chamber by moving toward the outer wall of the chamber under a relatively high pressure from the fluid from the line and rebounding to a predetermined position away from the outer wall of the chamber when under a relatively low pressure from the fluid from the line.

Abstract: Disclosed is an air pump assembly for ventilative footwear, in which the air pump assembly is mounted onto a heel portion of an outsole, so that external air is forcibly introduced into an interior of a shoe when walking, thereby cleaning the interior of the shoe and providing a pedestrian with a cushion function. If the air pump assembly is compressed by the compression force, the bending portion is smoothly bent along the resilient ring, while if the compression force is released, the rigid plate the bending portion is naturally restored. Accordingly, the fatigue of the bending portion due to the repeated retraction is reduced, thereby preventing the rupture of the assembly and thus extending its life.

Abstract: A device for generating electricity includes a first portion including a first wall defining a first fluid passage and a second portion including a second wall defining a second fluid passage. A generator is coupled between the first and second portions and is capable of generating electricity in response to flow of a fluid from the first fluid passage to the second fluid passage through the generator. The generator is capable of generating electricity sufficient to power one or more electronic devices coupled to the generator. The flow of the fluid is associated with activity of a biological system of a user, for example, cardio-pulmonary activity of the user.

Abstract: A method, system and apparatus for performing peritoneal dialysis are provided. To this end, in part, a pump for a dialysis system is provided. The pump includes a first chamber wall including a first aperture, a second chamber wall including a second aperture, a piston, at least a portion of which can move through the second aperture, the piston including a third aperture, and first and second membranes disposed between the first and second chambers walls. A vacuum can be applied through the first aperture to pull the first membrane towards the first chamber wall and can be applied through the third aperture to pull the second membrane towards the piston. The piston can thereafter move the second membrane.

Abstract: In a pump employing a bellows, individual members are formed from resins and pump components including a fitted assembly formed by fitting plural members with each other form a structure unit which is tightly inserted in an external cover and constrained on the opposite ends thereof for come off prevention. Thus, the distortion or deformation of the members during assembly is obviated and hence, a good sealing performance is achieved.

Abstract: A fluid-handling system capable, in various embodiments, of storing, mixing, and dispensing fluids, and also regulating the flow of fluids. The system includes a cartridge having a non-expandable housing, and a bladder within the housing. In some variations, a drive-liquid is introduced into a region between the housing and the bladder, which causes fluid contained within the bladder to dispense. In some other variations, the drive-liquid is introduced into the bladder, which causes the bladder to expand and expel fluid that is contained with the housing.

Abstract: A direct methanol fuel cell (DMFC) system is provided with a pump for pumping methanol into the cell. The pump is driven by carbon dioxide produced by the electro-chemical reaction at the anode of the fuel cell. Because the amount of CO2 generated is proportional to the power generated by the cell, and thus the amount of fuel demanded by the cell, the pump is self-regulating. The system may be integrated using microelectro-mechanical system fabrication techniques.

Abstract: A pump includes an outer body; and a wall within said outer body. The outer body and the wall define a pumping cavity and an excitation cavity within the outer body. An excitable medium is contained within the excitation cavity. An excitation source is coupled to said excitable medium. This excitation source is operable to excite the excitable medium and create a standing wave therein. The standing wave acts through the wall to pump said fluid through said pumping cavity. Advantageously, the excitable medium is isolated from the pumped fluid by the wall.

Abstract: Methods and systems are disclosed for pumping fluids at desired average flow rates by applying a predetermined force to a pump chamber and pulsing an outlet valve of the pump chamber to deliver a fluid therefrom. In some embodiments, pump chambers are provided within removable pumping cartridges that are constructed and configured to be coupled to a reusable pump drive component. In other embodiments, the pumping cartridges include multiple pump chambers, which pump chambers are operated so that a pump flow rate of one pump chamber is a predetermined fraction of the pump flow rate of another pump chamber within the pumping cartridge.

Abstract: A liquid pump for pumping groundwater samples from small diameter sub-terrain wells, comprising a tubular casing having inlet apertures, a top cap provided with a fluid communication port and a liquid outlet port, a top bladder mandrel secured to the top cap, a mandrel sealing member disposed in a lower end of the casing, a bottom bladder mandrel secured to the mandrel sealing member, and a flexible bladder extending between the top bladder mandrel and the bottom bladder mandrel and defining a liquid chamber for receiving the liquid therein and a fluid chamber for receiving a fluid under pressure therein that surrounds the liquid chamber, with the bladder disposed therebetween. The fluid chamber is in fluid communication with the fluid communication port connected to a source of the actuating gas, while the liquid chamber is in one-way fluid communication with the liquid inlet and the liquid outlet port.

Abstract: A micropump has two chambers separated by an actuator for causing fluid to flow in the chambers. Each chamber is equipped with a ball that acts as a valve for allowing flow in a desired direction. The balls are heavier than the fluid being pumped, and reside at an interface between the chambers and passages feeding fluid into the chambers and provide a tight seal between the chambers and passages feeding the chambers when fluid pressure forces the fluid back toward the feeding passages.

Abstract: The invention provides a pulsation damping device in which an offset load on a pulsation suppression diaphragm is eliminated while an air supply valve and an air discharge valve are separately and independently juxtaposed, and an extendable and contractible portion of the pulsation suppression diaphragm is always caused to be straightly extendingly and contractingly deformed in the axial direction of a device body casing, whereby the response property of the opening and closing operations of the air supply and discharge valves can be improved and the pulsation suppressing performance can be ensured.

Abstract: A diaphragm pump, in which a working fluid control valve (D) opens a working fluid make-up passage (B24) to prevent a diaphragm (C) from being damaged when an excessive discharge pressure acts on the diaphragm. The working fluid control valve (D) for opening and closing the working fluid make-up passage (B24) is provided with a valve disc formed to be capable of reciprocating relative to the diaphragm (C) in a valve disc receiving chamber (B2) to close an opening of the valve disc receiving chamber (B2), means for biasing the valve disc toward the diaphragm, and means for closing the working fluid make-up passage (B24) when a distance, over which the valve disc extends from the opening of the valve disc receiving chamber, exceeds a predetermined value.

Abstract: The linear pump (10,110) includes a housing (12, 112) and either two(20, 22) or one (120) flexible bladders each within a pump housing and interconnected to respective end caps (30, 32, 130, 132, 134, 136). Upon movement of a movable end cap relative to a stationary end cap, the volume in each bladder may be variably controlled to pump blood or another selected fluid. Linear movement of the end caps may be controlled by an attractive or repulsive force between end caps. The pump (110) with a permeable bladder (120) may be used to pump wastewater.

Abstract: An air-operated pump for groundwater sampling and other applications includes a removable cartridge coupled to a manifold configured to receive air-inlet and fluid-discharge tubes from an above-ground location. The removable cartridge may be in the form of a bellows or bladder, and may be removably attachable to the pump body through a press fitting. In contrast to prior implementations, the pump body features a manifold with fittings enabling the air-inlet and fluid-discharge tubes to be respectively inserted and sealed into the air-inlet and fluid-discharge ports. In the preferred embodiment, the fittings are such that the associated tubes cannot be removed without modification. For example, the fittings may include a grab plate associated with one or both of the air-inlet and fluid-discharge ports. Each grab plate includes an aperture with finned serrations such that through proper sizing of the plate features and associated tubing, the tube(s) may be inserted and sealed through appropriate compression.