328 results about "Helical channel" patented technology

One aspect of an intravascular ventricular assist device is an implantable blood pump where the pump includes a housing defining a bore having an axis, one or more rotors disposed within the bore, each rotor including a plurality of magnetic poles, and one or more stators surrounding the bore for providing a magnetic field within the bore to induce rotation of each of the one or more rotors. Another aspect of the invention includes methods of providing cardiac assistance to a mammalian subject as, for example, a human. Further aspects of the invention include rotor bodies having helical channels formed longitudinally along the length of the body of the rotor where each helical channel is formed between peripheral support surface areas facing radially outwardly and extending generally in circumferential directions around the rotational axis of the rotor.

A downhole tool which can perform a task in a well bore, such as circulating fluid radially from the tool. The function is selectively performed by virtue of a sleeve moving within a central bore of the tool. Movement of the sleeve is effected by dropping a ball through a ball seat on the sleeve. Movement of the sleeve is controlled by an index sleeve such that the tool can be cycled back to the first operating position by dropping identical balls through the sleeve. Embodiments are described wherein the balls are deformable, the seat is deformable and the seat provides a helical channel through which the ball passes.

This invention is based on size and mass separation of suspended particles, including biological matter, which are made to flow in a spiral channel. On the spiral sections, the inward directed transverse pressure field from fluid shear competes with the outward directed centrifugal force to allow for separation of particles. At high velocity, centrifugal force dominates and particles move outward. At low velocities, transverse pressure dominates and the particles move inward. The magnitudes of the two opposing forces depend on flow velocity, particle size, radius of curvature of the spiral section, channel dimensions, and viscosity of the fluid. At the end of the spiral channel, a parallel array of outlets collects separated particles. For any particle size, the required channel dimension is determined by estimating the transit time to reach the side-wall. This time is a function of flow velocity, channel width, viscosity, and radius of curvature. Larger particles may reach the channel wall earlier than the smaller particles which need more time to reach the side wall. Thus a spiral channel may be envisioned by placing multiple outlets along the channel. This technique is inherently scalable over a large size range from sub-millimeter down to 1 μm.

One aspect of an intravascular ventricular assist device is an implantable blood pump where the pump includes a housing defining a bore having an axis, one or more rotors disposed within the bore, each rotor including a plurality of magnetic poles, and one or more stators surrounding the bore for providing a magnetic field within the bore to induce rotation of each of the one or more rotors. Another aspect of the invention includes methods of providing cardiac assistance to a mammalian subject as, for example, a human. Further aspects of the invention include rotor bodies having helical channels formed longitudinally along the length of the body of the rotor where each helical channel is formed between peripheral support surface areas facing radially outwardly and extending generally in circumferential directions around the rotational axis of the rotor.

A surgical stapling device is disclosed for performing circular anastomoses. The surgical stapling device includes a handle portion, an elongated body portion and a head portion including an anvil assembly and a shell assembly. The head portion includes an anvil assembly including a tiltable anvil which will tilt automatically after the device has been fired and unapproximated. The tiltable anvil provides a reduced anvil profile to reduce trauma during removal of the device after the anastomoses procedure has been performed. The stapling device includes an approximation mechanism including a rotatable knob, a screw having a helical channel and an anvil retainer. The helical channel includes a dwell portion for providing a tactile indication to a surgeon that the anvil retainer has been advanced to a position wherein the anvil assembly can be removed from the anvil retainer. A removable trocar for attachment to the anvil assembly is also disclosed which includes a rib positioned proximally of a mounting projection. The rib is positioned to align the mounting projection with associated engagement structure of the anvil assembly.

A cryogenic coupling device includes a valved receptacle and a valved nozzle. Rollers in an outer collar of the receptacle are received in helical channels along a collar of the nozzle. A notch or detent in each of the channels provides a vent position to vent fluid before the nozzle is fully disconnected from the receptacle. Interface seals on the nozzle include first and second annular seals that function as ice and containment scrapers, as well as fluid seals. The nozzle has a rotatable handle assembly, isolated from the fluid path, which provides easy connect and disconnect of the nozzle from the receptacle. The handle assembly includes a thermal break, and is easily removable from the nozzle, along with other parts of the nozzle and receptacle, for service and maintenance.

An external circulation type ball screw is provided with a helical passage in the outer surface of the nut. The helical passage and the inner helical groove of the nut are opposite in winding direction to each other. The nut is defined with two through holes which are connected to both ends of the inner helical groove and the helical passage, respectively, so that the helical passage and the inner helical groove are connected to each other to form a circulating path for the circulation of the balls. Since the helical passage winds about the outer periphery of the nut, the balls can roll more smoothly.

An inertance tube and a surge volume for a pulse tube refrigerator system may be integrally coupled together, such as by the inertance tube being at least in part a channel in a wall of the surge volume. The surge volume may have a helical channel in an outer wall that forms part of the inertance tube. The surge volume tank may be surrounded by a cover that closes off the channel to form the inertance tube as an integral part of the surge volume. The inertance tube may have a non-circular cross section shape, such as a square shape or non-square rectangular shape. The channel may be tapered, perhaps changing aspect ratio. Alternatively, the inertance tube may be a separate tube having a non-circular shape, which may be wrapped around at least part of the surge volume.

An aerofoil component of a gas turbine engine is provided. The component has a longitudinally extending aerofoil portion which spans, in use, a working gas annulus of the engine. The aerofoil portion contains an internal chamber for a flow of coolant. The chamber includes a helical passage which spirals in a plurality of turns around an axis that extends in the length direction of the aerofoil portion.

An electrical submersible pump assembly for use in a well, including a well having a high gas-to-liquid ratio has a motor, a hollow, tubular drive shaft which drives the pump, and a liquid-gas separator assembly upstream of the pump intake. The liquid-gas separator has a hollow tubular portion, which communicates with the open, lower end of the drive shaft, openings through its sidewall, and a closed lower end. The sidewall also includes at least one outwardly extending projection shaped for urging liquid contained in a liquid / gas mixture flowing towards the pump outwardly, away from the sidewall openings. Preferably, the outwardly extending projection comprises a helical blade which, using either the well casing or a separate sheath, defines a helical channel through which the oil-gas mixture flows prior to reaching the pump intake. The centrifugal force in the channel forces the oil component away from the openings and forces the gas component through the openings, where such gas may be vented to the surface.

The invention relates to an efficient heat exchanger employing a reinforced spiral pipe. The efficient heat exchanger comprises an outer pipe, and an inner pipe arranged in the outer pipe in a sleeved manner, wherein the inner pipe comprises two end parts and a multi-head spiral section pipe body arranged between the two end parts; the two ends of the inner pipe serve as a first fluid inlet and a first fluid outlet; the two ends of the outer pipe serve as a second fluid inlet and a second fluid outlet; a first fluid channel is formed in the inner pipe; and a second fluid channel consisting of multiple wave-shaped encircling concave-convex spiral channels is formed between the outer pipe and the inner pipe, and uniformly surrounds the first fluid channel according to the spiral trajectory. As the multi-head spiral section pipe body of the inner pipe is machined to a structure formed by spirally extending wave-shaped encircling concave-convex strip curved surfaces according to the spiral trajectory, and the outer wall or the inner wall of the multi-head spiral section pipe body has fin structures, the heat transfer efficiency is improved, the efficient heat transfer coefficient of the multi-head spiral pipe body is stabilized and continued, the heat exchange area of the outer surface of the inner pipe is effectively and obviously increased, and the heat exchange capacity of the heat exchanger is effectively improved.

The present application relates to a liquid-evaporate delivery device which relies on the efficient use of air currents to deliver liquid evaporate to airspace around the device. Efficient air currents may be provided by rotating the air currents around the wick, by providing a helical channel for the air to flow around the wick, and / or by aligning a fan with the longitudinal axis of the wick.

A continuous detonation system, including: a rotatable member including a forward end, an aft end, a circumferential wall and a longitudinal centerline axis extending therethrough; an outer circumferential wall, wherein the rotatable member is positioned therein so that the circumferential wall of the rotatable member is spaced radially inwardly from the outer circumferential wall; at least one helical channel formed by a plurality of helical sidewalls extending between the circumferential wall of the rotatable member and the outer circumferential wall, each helical channel being open at the forward end and the aft end of the rotatable member so as to provide flow communication therethrough; an air supply for providing air to each helical channel; and, a fuel supply for providing fuel to each helical channel. In this way, a mixture of the fuel and air is continuously detonated within each helical channel in a manner such that combustion gases exit therefrom with an increased pressure and temperature.

An electric motor is disclosed that includes a rotor having an axis and being rotatable about the axis. A stator is positioned about the rotor and includes a plurality of laminates with each laminate in the plurality of laminates including a peripheral edge defining a notch. The plurality of laminates includes a plurality of laminate subsets, with the laminates in each laminate subset arranged with the notches aligned to define a passage. The laminate subsets are arranged such that the passages defined by the laminate subsets form a substantially helical channel along the periphery of the stator.

The invention relates to a non-interpenetrating chiral MOF (metal organic framework) stationary phase, its preparation method and application in enantiomer separation in HPLC (high-performance liquid chromatography). The stationary phase is a non-interpenetrating chiral three-dimensional porous framework complex with a structural formula as {[ZnL].H2O}n. An asymmetric structural unit {[ZnL].H2O} of the complex is composed of a Zn<2+>, an L ligand and a guest water molecule. The L ligand is -NH- containing chiral pyridine carboxylic acid, its chemical composition is [(N-(4-pyridylmethyl)-L-leucine.HBr)], and its molecular formula is C12H19BrN2O2. Chiral amino acid and 4-pyridylaldehyde are selected as raw materials to synthesize the-NH- containing pyridine carboxylic acid chiral ligand by a one-step process. The ligand and zinc acetate are adopted as raw materials to undergo room temperature diffusion so as to obtain the MOF stationary phase. The material provided in the invention has uniform chiral helical channel, uniform aperture and orifice, and can be used for separation of chiral drugs and other enantiomers. The separation is selectively dependent on the size of a separated enantiomer molecular size, but is not dependent on the functional group of the separated enantiomer. Thus, the non-interpenetrating chiral MOF stationary phase has the characteristics of traditional zeolite molecular sieve separation.

Powder feed cylinder assemblies and powder feeders are provided. A powder feed cylinder assembly includes a cylinder, a bit, and bushings. The cylinder has a main passage, a first feed channel, and a second feed channel, each feed channel at two axial locations between the cylinder's two ends. The bit extends through the main passage and has an outer surface including a helical channel formed thereon. A center bushing is disposed in the main passage between the two axial locations and has a first axially-extending passage through which the bit extends. The first end bushing is disposed in the main passage on one side of the center bushing and has a second axially-extending passage through which the bit extends. The second end bushing is disposed in the cylinder on the other side of the center bushing and has a third axially-extending passage through which the bit extends.

A portable ultrafine nebulizer comprises a housing, an atomizing nozzle located at the front port of the housing, an air turbine deposited inside the housing, an air flow guide device fixed at the front port of the housing, and a water pump for pumping liquid; the air flow guide device is provided with a plurality of air flow guide blades distributed uniformly around the periphery of the atomizing nozzle, and each of the air flow guide blades is provided with a guide surface; in the atomizing nozzle is provided with a spiral channel and a fluid channel communicated with the water pump, the atomizing nozzle is provided with a spray port at the front end, and the spray port is communicated with the fluid channel through the spiral channel; the air turbine, the air flow guide blades and the spray port are distributed successively along the airflow direction.

The present invention relates to a device for separating an effluent comprising phases of different density and conductivity, the device comprising a pair of electrodes (12, 13), means (10) for introducing the effluent between said electrodes, means intended for separation (3) and discharge (4) of said separated phases. The separation means comprise at least one centrifugation element including a helical channel (19) in which the effluent is centrifuged after passing between the electrodes. An opening extends over the entire periphery of said centrifuged effluent so as to discharge part of the centrifuged effluent. The discharge means further comprise sealing means for limiting discharge of the less dense phase through said opening.

The present invention is a firearm cartridge feeding system to automatically feed firearm cartridges in a successive order one diameter of a firearm cartridge at a time, to the chamber of a bolt action, semi-automatic, or fully automatic firearm until all firearm cartridges in the system are expended. The firearm cartridges are stored in a tight spiral channel side by side to maximize the use of the peripheral space surrounding the area of a magazine well or feed point of a firearm. The housing or body of the firearm feeding system consists of a multiple segment body or housing. The housing contains a spiral channel, clutch mechanism pocket and a spring drive compartment which supports the storage of firearm cartridges and the arrangement of a drive system for feeding the firearm cartridges to the feed lips.

An outwardly-opening gas-exchange valve assembly for an internal combustion engine. The valve assembly includes a port in a firing chamber in an engine head, the port having a valve seat on a side opposite from the firing chamber. A piston-shaped poppet valve head slides in a bore in the engine head for mating with the valve seat to occlude passage of gas across the valve seat. Withdrawal of the poppet valve head from the seat opens the firing chamber to communication with an intake or exhaust manifold runner in the engine head. The poppet valve head may be actuated by an overcenter lever arrangement actuated selectively by hydraulic pressure or mechanical actuation. In a preferred embodiment, OO intake and exhaust valves are radially arranged in a hemispherical fire deck and may include an adjustable pitch helical channel to induce swirl to the incoming gas.

A fuel nozzle includes a center body that extends axially along an axial centerline for a length. A shroud circumferentially surrounds the center body for at least a portion of the length of the center body. A plurality of helical passages circumferentially surround the center body along at least a portion of the length of the center body, and a fuel port in each helical passage has a different convective time.

An air driven diaphragm pump includes an performance control actuator having a housing with opposed air chambers. The pump includes pump chambers facing the air chambers and pump diaphragms extending between each air chamber and each pump chamber, respectively. The actuator further includes an air valve, an intake to the air valve and an engagement. The intake includes an intake passage and a performance control intake adjuster rotatably mounted. The intake adjuster has a helical channel and a closure element extending adjustably into the intake passage. The engagement engages the helical channel for control of the intake. The helical channel has varied pitch to provide a nonlinear relationship between rotation and axial advancement of the intake adjuster. The nonlinear relationship gives flow rate proportional to the angular rotation of the intake adjuster. The end points of the channel provide a practical minimum pump performance of about 40% of maximum pump flow rate and a maximum pump performance of about 97% of maximum pump flow rate.

The present application relates to a liquid-evaporate delivery device which relies on the efficient use of air currents to deliver liquid evaporate to airspace around the device. Efficient air currents may be provided by rotating the air currents around the wick, by providing a helical channel for the air to flow around the wick, and / or by aligning a fan with the longitudinal axis of the wick.

A system for applying a polymer (hydrogel) to the inner surface of a vessel by photopolymerization includes an inner catheter received within an outer catheter and a fluid channeling structure mounted on the catheters with its proximal end attached to the outer catheter and its distal end attached to the inner catheter. The fluid channeling structure includes an elastomeric sleeve sandwiched between an inner elastic coil and an outer light emission coil. Light emission coil loops are interspaced with elastic coil loops. The light emission coil has a smaller diameter than the elastic coil, drawing the elastomeric sleeve down between loops of the elastic coil to form a helical channel. The coils and sleeve are stretched to provide a narrowed crossing profile for delivery, and are contracted at a treatment site to form a helical cavity between the sleeve and the vessel wall within which to perform interfacial photopolymerization.

The present invention is a firearm cartridge feeding system to automatically feed firearm cartridges in a successive order one diameter of a firearm cartridge at a time, to the chamber of a bolt action, semi-automatic, or fully automatic firearm until all firearm cartridges in the system are expended. The firearm cartridges are stored in a tight spiral channel side by side to maximize the use of the peripheral space surrounding the area of a magazine well or feed point of a firearm. The housing or body of the firearm feeding system consists of a multiple segment body or housing. The housing contains a spiral channel, clutch mechanism pocket and a spring drive compartment which supports the storage of firearm cartridges and the arrangement of a drive system for feeding the firearm cartridges to the feed lips.

The invention relates to a sensor, and particularly relates to a structure improvement of a sensor, with which various fluid media can be fully in contact with a measurement probe. A probe of the sensor disclosed by the invention comprises an internal element and an outer shell with which the internal element is sleeved, wherein the internal element is internally provided with a chip body; the surface of the internal element is provided with a spiral channel; the lower end of the outer shell is provided with an opening, so that the internal element and the outer shell with which the internal element is sleeved form a hollow dual-layer structure which is provided with the spiral channel and is open at the lower end; a plurality of through holes are formed in the outer shell and correspond to the internal spiral channel. The sensor provided by the invention is used for performing sensing measurement on a fluid.

A self-rotating mop has a mop head, a rotating rod, an actuating assembly and a top pole. The rotating rod is connected securely to the mop head and has spiral channel. The actuating assembly is mounted between the rotating rod and the top pole and has an actuating sleeve and an actuating ring. The actuating sleeve has multiple upper ratchets, and the actuating ring has multiple lower ratchets and multiple curved ribs. The curved ribs of the actuating ring engage the spiral channel of the rotating rod. When the top pole is pushed downward, the upper and lower ratchets engage with each other to force the rotating rod to rotate and move upward. When the top pole is pulled upward, the upper and lower ratchets disengage with each other and the actuating ring is rotated to allow the top pole for moving upward.

A small microcombustion heater which can realize reliable combustion. The heater has a premixed gas passage which reaches a combustion chamber, and a passage for a combustion gas drawn from the combustion chamber. The passages are arranged in a spiral form in a manner such that a heating wall is provided between the passages. The width of the premixed gas passage is a quenching distance or less, where the quenching distance is determined depending on the premixed gas. The heater has two outer faces for holding the spiral passages from both sides of the upper and lower edges of the heating wall, and at least one of the outer faces is a heating surface for emitting radiant heat. Typically, the spiral passages are placed between a heat-resisting heating plate and a heat insulating plate, and an outer face of the heat-resisting heating plate functions as the heating surface.