6821 results about "Backflow" patented technology

Containers for providing vapor phase reactant from liquid sources include bubbler designs and designs in which carrier gas flows over the liquid surface. Among the bubbler arrangements, a bypass conductance is provided to release excess pressure from the gas volume inside the container, or an enlarged bubbler tube is provided with a volume sufficient to accommodate all possible liquid backflow without having the liquid exit the container. Among the overflow designs, flow dividers provide a tortuous path for the gas to increase the time exposure of carrier gas packets to the evaporating liquid surface. The flow dividers can be microporous to encourage capillary action, thereby increasing the evaporating surface. The tortuous gas flow path can be separated from the liquid phase by a breathable semi-porous membrane that permits vapor phase reactant to pass through but prohibits liquid from passing in the other direction.

Disclosed is a conduit that provides a bypass around an occlusion or stenosis in a coronary artery. The conduit is a tube adapted to be positioned in the heart wall to provide a passage for blood to flow between a heart chamber and a coronary artery, at a site distal to the occlusion or stenosis. The conduit has a section of blood vessel attached to its interior lumen which preferably includes at least one naturally occurring one-way valve positioned therein. The valve prevents the backflow of blood from the coronary artery into the heart chamber.

A reaction chamber apparatus includes a vertically movable heater-susceptor with an attached annular attached flow ring that performs as a gas conduit. The outlet port of the flow ring extends below the bottom of a wafer transport slot valve when the susceptor is in its process (higher) position, while the gas conduit formed by the flow ring has an external surface at its edge that isolates the outer space of the reactor above the wafer from the confined reaction space. In some cases, the outer edge of the gas conduit is in proximity to a ring attached to the reactor lid and, together, the ring and conduit act as a tongue-in-groove (TIG) configuration. In some cases, the TIG design may have a staircase contour, thereby limiting diffusion-backflow of downstream gases to the outer space of the reactor.

A method and apparatus for direct interstitial treatment of tissue, while preventing backflow and decreasing drainage of a flowable composition from an injected area, by using a catheter and / or a needle with single or multiple inflatable member(s) that stretches, dilates and compresses target tissue and allows for an improved interstitial deposition, distribution and retention of the flowable composition, drug(s), agent(s), or particle(s), into a body organ, fluid, tissue, or tumor, thereby increasing procedural safety and efficacy of direct interstitial therapies.

Medical stents having valves and their methods of manufacture are disclosed. The valve may be basket-shaped and formed integral to a medical stent to prevent undesirable backflow across the valve. The valve can be formed by converting the braided wires of the stent, by providing elastomeric material onto a mold or fixture to form an elastomeric valve, or by attaching a gasket valve. The valve is normally closed but configured to allow easy opening in response to a predetermined condition.

A converter circuit providing multiple current bypass routes between the output leads to provide reliability in a series connection of several converters. If the converter malfunctions due to component failure, the current bypass routes provide a path for the current that views the malfunctioning converter as substantially a short. Diodes prevent backflow into the power source connected to the converter. Redundancy is provided in the bypass portions of the converter circuit that provides alternate parallel paths in case a defective component in one of the paths opens the circuit along that path. In one example, the converter is implemented as a buck plus boost converter where either the buck or the boost portion or both are operative responsive to a controller controlling the switches of both portions. Most of the converter circuit may be implemented in an integrated circuit.

A prosthetic venous valve includes a frame and leaflets. The frame includes: (i) a generally hollow base disposed at a blood inflow end; (ii) a plurality of struts connected with the base and extending generally parallel to a direction of forward flow of blood from the generally hollow base to a blood outflow end; and (iii) inwardly oriented flanges disposed at the blood outflow ends of the struts. The leaflets are disposed in gaps between the struts and are supported by the frame. The leaflets are arranged to close into the vein lumen to substantially seal against backflow of blood from the blood outflow end to the blood inflow end. The inwardly oriented flanges of the struts enhance the sealing.

The invention provides a catheter for insertion into a biological passage which contains a first flowing fluid, the catheter including a tubular member having a proximal end and a distal end; a fluid delivery lumen contained within the tubular member; an inflatable balloon assembly disposed at the distal end of the tubular member, the balloon assembly including an inflatable balloon member having an uninflated state and an inflated state, the balloon assembly including apertures in communication with the fluid delivery lumen; an inflation lumen in communication with the balloon member; and a valve contained within the inflatable balloon assembly. The inflatable balloon is assembly configured such that when the balloon member is in the inflated state: (i) sections of the balloon member contact the biological passage defining at least one containment pocket; (ii) the apertures are disposed in the containment pocket, (iii) a flow lumen is defined through the balloon member to allow the first fluid to flow through the balloon member; and (iv) the valve functions to allow the first flowing fluid to flow through the flow lumen in a physiologic direction, while blocking backflow of the first fluid through the flow lumen.

The present invention relates to apparatus and methods for preventing backflow into a beneficial agent dispensing osmotic delivery system.

An infusion system for delivery of therapeutic fluids from a remote source into a patient's body. The system has an infusion assembly, a rotating pivot joint member, a fluid connector assembly, and a sealing assembly retained within the infusion assembly between the housing of the infusion assembly and the rotating pivot joint member. The seal reduces leakage of fluids. The rotating joint may be pivoted to three distinct positions to allow for emplacement on the patient, delivery of the therapeutic fluid to the patient, and protected, sealed closure of the fluid channels to avoid patient fluid backflow.

A vapor chamber structure includes a casing, a working fluid, a wick layer, a plurality of structure strengthening bodies, and a plurality of backflow accelerating bodies. The casing has an airtight vacuum chamber. The working fluid is filled into the airtight vacuum chamber. The wick layer is formed on a surface of the airtight vacuum chamber. The structure strengthening bodies are respectively arranged in the airtight vacuum chamber for supporting the casing. The backflow accelerating bodies are respectively arranged in the airtight vacuum chamber for increasing the backflow velocity of the working fluid. Therefore, the present invention can maintain the completeness of the vapor chamber structure and increase the backflow velocity of the working fluid due to the match of the structure strengthening bodies and backflow accelerating bodies. Because the backflow velocity of the working fluid is increased, the heat-transmitting efficiency is increased.

The invention discloses a fracturing system with the antifreezing performance. The fracturing system comprises a first branch and a second branch, wherein the first branch comprises a clear water tank, a mixing truck, a buffer tank, a sand blender, a fracturing device, a first cock and a throttle manifold connected in sequence; the outlet of the throttle manifold enters the clear water tank through backflow, to form a closed circulating system; the second branch comprises a hot melting wax truck, a dual-machine pump truck, a coiled tubing and a wellhead; the hot melting wax truck, the dual-machine pump truck and the coiled tubing are sequentially connected; the coiled tubing penetrates through the wellhead to enter the shaft bottom; the wellhead in the second branch is connected with the inlet end of the first cock in the first branch through a high-pressure pipeline; and the high pressure pipeline is provided with a second cock close to the inlet end of the first cock. The fracturingsystem has the following beneficial effects: during the construction process, a steamer is adopted to fully swell guanidine gum; and when construction is not carried out, all pipelines are adopted torealize antifreezing and thermal insulation in a circulating manner to avoid pipeline dismantling.

A probe for application to a body part particularly a finger of a patient to detect a change in the physical condition of the patient includes a housing defining a compartment closed at one end and open at the opposite end for receiving the distal end of the patient's finger and means consituted of a medium wholly self-contained within the probe for applying a static pressure field substantially uniformly around the distal end of the patient's finger, of a predetermined magnitude sufficient to substantially prevent distention of the venous vasculature, uncontrolled venous backflow, and retrognade shockwave propagation into the distal end, and to partially unload the wall tension of, but not to occlude, the arteries in the distal end when at heart level or below. A sensor senses changes in the distal end of the patient's finger related to changes in arterial blood volume therein.

The invention relates to a meter box for housing a utility meter and configured for associating a customer service line to a utility service line. The meter box may be configured to fit within an existing meter box and may be configured with side sections in a telescopic arrangement. Flow control components at an input of the meter box prevent backflow.The meter box comprises an electronic module that includes a variety of selectable features including datalogging, AMR, environmental monitoring, and resource monitoring. A remote monitor is provided for allowing a customer to view selected data including consumption data, pressure, pH, temperature, warnings, remote turnoff, and provide secured bill paying services. Imaging / audio components provide visual and audio data which may include an image of an analog readout for a meter register, images of the metering environment, and sound data for metering environment.

An apparatus for vascular access devices such as syringes and guidewires placement devices capable of differentiating type of blood vessel penetrated by a cannula, including a chamber in flow communication with the cannula, the chamber being adapted to house a vacuum pressure to accelerate backflow of blood from a blood vessel penetrated by the cannula and a slideable, displaceable member within the chamber, such as a piston, displaceable against a calibrated pressure sensitive resilient member such as a spring. The displaceable member is displaced against the pressure sensitive spring rearwardly by the blood pressure indicating to the operator the type of blood vessel penetrated by the cannula by the amount of rearward displacement of the piston in respect to a point reference tab located on the side wall of the chamber.

On a head section connected to a distal end of an inserter of an endoscope, an air / water nozzle, an observation window and a ring projection are provided. On the ring projection, a first inclined plane and a vertical plane are formed. The first inclined plane inclines such that the outer diameter thereof gradually decreases from the top surface of the observation window toward a flat surface. The vertical plane is positioned at the counter side from the air / water nozzle across the observation window. Fluid injected from the air / water nozzle hits the first inclined plane and spreads to pass over the observation window. The vertical plane stops backflow of a water drop on the flat surface toward the observation window, so as to prevent that the water drop reaches on the top surface of the observation window.

In a premixing burner (1) for a gas turbine or hot-gas generation for the combustion of liquid or gaseous fuel, in which fuel is mixed with combustion air (9a, 9b) in a burner interior (14), is fed to a combustion chamber (3) and is burnt in this combustion chamber (3), stabilization in the part-load mode is achieved in a simple and efficient way in that means (15) are provided which make it possible to recirculate hot exhaust gas (17) out of the combustion chamber (3) into the burner interior (14) and to stabilize the flame by means of selfignition processes. The means (15) are preferably a recirculation line which picks up hot exhaust gas (17) from the outer backflow zone (10) and feeds it to the burner interior (14) in the region of a burner tip (2) facing away from the combustion chamber (3), additional fuel (pilot fuel 21) being admixed with the exhaust gas (17) in the recirculation line upstream of the feed to the burner interior (14).

A reusable continuously sealing metered dosing one-way valve assembly and delivery system flows a premeasured amount of a sterile flowable substance from a source which is coupled to an actuator assembly to an outlet orifice and prevents any backflow of contaminants through the continuously sealing one way valve assembly when the flowable substance ceases to flow. The valve assembly includes an elastomeric membrane which aids in preventing any backflow of contaminants when dispensing of the flowable substance is stopped. Multiple dosing of preservative-free flowable substance is provided.

The invention discloses a method for preparing a lithium ion battery anode / cathode material from reduced graphene oxide. The method comprises the following steps: performing ultrasonic dispersion on graphite oxide in an organic solvent, thereby obtaining a graphene oxide dispersion liquid; reducing by using an appropriate reducing agent or directly using a solvent, oxidizing graphene through oil bath backflow, a hydrothermal method or other reduction methods, thereby obtaining a reduced graphene oxide material containing part of oxygen-containing groups. When the prepared reduced graphene oxide material is used in a lithium ion battery anode material, a relatively high specific discharge capacity can be achieved, that is, is up to 280mAh / g, and good circulation stability and excellent rate performance are achieved. The prepared reduced graphene oxide material can be also used in a lithium ion battery cathode material, the specific discharge capacity can be kept being 900mAh / g and more than 900mAh / g after 100 rounds of charge / discharge circulation, and the circulation stability is relatively good. The method can be a significant study point of high-performance low-cost electrode materials of lithium ion batteries.

A dispensing cartridge for a relatively precise dispensing of various fluids having a relatively wide range of viscosities is disclosed. The dispensing cartridge in accordance with the present invention is relatively simpler in configuration than known dispensing cartridges while minimizing leakage of the fluid and eliminating problems associated with chemical attack of the O-ring by the fluid in the dispensing cylinder. In particular, the dispensing cartridge in accordance with the present invention includes a cylinder; a piston with a central bore and a bleed plug. In order to simplify the design, the air vent is configured as a tortuous path, for example, a spiral path, defined by a spiral bleed plug, which in a pre-staged position, allows air to freely escape along the spiral path along the circumference of the plug. As the piston contacts the fluid, the forward motion of piston is resisted by the high back pressure created by the small effective diameter and relatively long length of the spiral path. Once the piston contacts the fluid, the spiral plug is pushed into the piston closing the spiral path. By controlling the fluid flow by way of a tortuous path, the amount of fluid backflow through the piston is minimized if not eliminated, thus eliminating the need for an annular overflow chamber, thereby simplifying the design of the piston. In order to minimize problems related to the sealing of the piston within the dispensing cartridge, the piston may be provided with one or more radially extending sealing lips. These sealing lips are used in lieu of or in conjunction with an O-ring. The sealing lips further simplify the design by eliminating the O-ring as well as the need for an annular chamber adjacent thereto as well as problems relating to chemical attack of the O-ring by the fluid within the dispensing cylinder. In an alternative embodiment for use that is particularly adapted with non-aggressive fluids, the piston is provided with a single sealing lip and an O-ring.

An apical implantation mitral valve balloon closure plate blocking body and an implantation method, for human heart repair are disclosed. A balloon closure plate made from an elastic plastic material which may be filled with a gas or a curable liquid is implanted via a small incision on the left side of the chest, enters the left ventricle via the apex, and is placed and fixed at a backflow hole position of a front and rear leaflet closure point of the mitral valve. The present disclosure treats diseases such as functional mitral valve regurgitation, and the success rate for repairing functional mitral valve backflow is more than 90%.