634 results about "Tubular membrane" patented technology

The present invention is primarily directed to a sleeve device comprising a thin-walled elongate internal tubular membrane which is suitable for being fitted around the external surface of an elongate medical instrument, wherein at least one longitudinally-disposed inflatable channel having a closed distal end is affixed to the outer surface of said membrane, and wherein each of said inflatable channels is capable of being expanded laterally such that an elongate medical instrument fitted with said sleeve and inserted into a body cavity would become anchored within said cavity, and such that the walls of said inflatable channel(s) would define the boundaries of one or more additional longitudinally-disposed large volume channels.

Advanced submerged membrane systems are provided. Said submerged membrane systems have multiple membrane modules comprising of strips of flat sheet membrane, bundles of self-support hollow fiber membranes braided together for reinforcement, tubular membranes, and braid supported hollow fiber membranes. Said submerged membrane systems have alternating relay, or two-way floating switch or computer to control filtration and back flush/pulse cleaning. Said submerged membrane systems have an oscillating motor, and aerator which can generate liquid vortex (whirlpool) flow around membrane to keep membrane from fouling. The present invention provides advanced submerge membrane systems at very low cost for drinking water production, wastewater treatment and membrane bioreactors for biotech, pharmaceutical and other industries.

The present invention relates to a medical device, and more particularly to a method of forming a tubular membrane on a radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electrostatically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.

A medical lead and method of treating a patient are provided. The medical lead comprises an electrically insulative tubular membrane, a resilient spring element associated with the insulative membrane, and at least one electrode associated with the insulative membrane. In the preferred embodiment, the tubular membrane has a non-circular cross-sectional shape. The spring layer is configured to urge that insulative membrane into an expanded geometry. The medical lead is configured to be collapsed into a compact form for percutaneous delivery into the patient, thereby obviating the need to perform an invasive surgical procedure on the patient. The body formed by these elements, when expanded, can be sized to fit within the epidural space of a patient. The patient can be treated by placing the medical lead into a collapsed state by applying a compressive force to the medical lead, percutaneously delivering the collapsed medical lead into the patient adjacent tissue to be treated, and placing the medical lead into an expanded state by releasing the compressive force. In one preferred method, the stimulation lead is used to stimulate tissue, such as spinal cord tissue.

The present invention relates to a medical device and method of forming the medical device. In particular, the present invention relates to a medical device having a tubular membrane structure over a radially expandable structural frame, and to a method of forming the tubular membrane on the radially expandable structural frame. In one aspect, a structural frame is placed over a spinning mandrel and a fiber is electro-statically spun over at least a portion of the structural frame forming a membrane. A transfer sheath may be used between the mandrel and structural frame to prevent the electro-statically spun fiber from adhering to the mandrel. In another aspect, a first membrane is spun over the mandrel before the structural frame is placed over the mandrel. In this aspect, at least a portion of the structural frame is sandwiched between the membranes. The membrane or membranes and structural frame form a fiber spun frame assembly. The fiber spun frame assembly may be coated with an elastic polymer. In addition, the membrane or membranes may go through some post processing to achieve desired characteristics or configurations.

A problem in the manufacture of filters using tubular membrane bundles is keeping potting material from flowing into the openings at the ends of the tubes. A preferred embodiment of a method for manufacturing a tubular membrane filter employs a non-contact heat source such as radiant heating to melt the tips of the tubular membranes. This prevents the migration of potting material into the tubes when the potting material is flowed into the ends of tube bundles during the manufacturing process for a filter.

The invention discloses a plate-tubular porous membrane based on polyvinylidene fluoride mixture, and relative production. The membrane substantially comprises polyvinylidene fluoride, dual-block amphipathic epoxyethane, and inorganic particles. And the preparation comprises that mixing polyvinylidene fluoride, dual-block amphipathic epoxyethane, inorganic particles, aperture adjusting agent and polarity solvent to obtain the membrane preparing liquid, using said membrane preparing liquid into plate or tubular liquid membrane, immerging the liquid membrane into solidifying bath mainly comprising water to be solidified into plate or tubular membrane. And the apertures of plate membrane and tubular membrane are 0.01-5.0 and 0.01-0.2 micrometers. The hydrophilic chain section of amphipathic epoxyethane is abundant at the face or aperture walls of the membrane, while said two membranes are both better in hydrophilic property and permeable property, with significant resistance on organic adsorption, to be used as ultra-filter membrane and micro-filter membrane in membrane water treatment.

Modular or cartridge-type membrane units utilize hollow, cylindrical tubular housings or receivers to house strings of removable membrane modules (elements) and normally comprise arrays of pipes that act as membrane module housings. A pseudo header for fluidly interconnecting the array of pipes reduces weight and cost. The pseudo header may comprise portions that are buried within skid components such as the toe bar. An internal low friction coating permits a larger number of membrane cartridges to be utilized in any cylindrical tubular membrane housing. A center feed pseudo header permits flow in two directions through the tubular membrane housing to double hydraulic capacity.

The invention relates to a flexible tubular solid liquid processor, with filter, heat exchange and thermal extraction functions, wherein the filter element at least comprises one flexible tubular membrane unit, upper flange room and lower flange room; the hydraulic extracting system comprises pressure container, extract pump and tubes; the material liquid of container can be filtered by the tubular filter membrane of membrane unit, and said material liquid can be used as work medium to extract the concentrated material liquid in the filter room of membrane unit and discharge filter slag; the pressure container or the filter room of membrane unit can be filled with medium to exchange heat, to realize thermal filter or extraction; the filter element is arranged on the bearing base inside the pressure container; the filter rotator can rotate the filter element to realize cross-flow filter; and the invention can be arranged with gas or water reverse tube and vacuum filter tube; the slag discharge system comprises slag discharger or tubular inner/outer membrane scraper, or vibration slag discharger, or compression slag discharger.

The present invention relates to a polyvinylidene fluoride nano composite super low pressure ultrafiltration membrane and its preparation method. The invented product is made up by using (by weight portion) 20-150 portions of PVDF, 0.1-20 portions of nano powder body, 10-1000 portions of dispersion medium, 10-50 portions of organic additive and 0.1-30 portions of inorganic additive. Is preparation method includes the following steps: making nano powder body, inorganic additive, organic additive and PVDF be successively added into the dispersion medium, dissolving for 3-48hr, standing still and defoaming for 5-24h to obtain membrane-moulding liquor, can make it into plate membrane, tubular membrane or hollow fibre membrane and correspondent membrane component.

One configuration of a separation system for separating hydrocarbons from contaminants downhole includes a tubular membrane having a fluid inlet end and a fluid outlet end. Between the fluid inlet end and the fluid outlet end of the membrane tube the membrane material selectively permeates contaminants, such as carbon dioxide, through the membrane while preventing the hydrocarbon from passing through the membrane achieving the downhole separation. A driving force of the membrane is increased by passing a sweep gas past the output side of the membrane during membrane separation to remove or dilute the contaminant at the output side of the membrane. The sweep gas improves the driving force of the membrane by increasing a partial pressure difference across the membrane.

The invention discloses a membrane treatment method of a landfill leachate concentrate. The method comprises the steps of adding lime and sodium carbonate into the landfill leachate concentrate, removing calcium, magnesium and heavy metal ions in the concentrate, performing tubular membrane filtration, then performing nano-filtration and reverse osmosis treatment, and discharging permeated liquid under standards so as to realize reduction of the landfill leachate concentrate. The membrane treatment method can be used for realizing the reduction of the landfill leachate concentrate, reducing the investment and treatment cost, and removing most pollutants in the concentrate at the same time.

The invention relates to a garbage percolate treatment technology belonging to the technical field of the treatment of high-concentration organic wastewater. The treatment technology comprises six steps of pretreating, anaerobically treating, treating by a tubular membrane bioreactor, performing nano-filtration /reverse osmosis deep treatment, treating concentrated liquor, treating sludge and thelike. The technology can be used for degrading COD (chemical oxygen demand), total nitrogen and total phosphorus in the high-concentration wastewater, removing heavy metal ions from the high-concentration wastewater, and the like. After the technology is used, the defect in the prior art is overcome, wherein the defect mainly refers to the problems of unstable system or high maintenance cost and the like, and a core unit of the technology is a gas-reinforced ceramic membrane bioreactor. High-concentration garbage percolate treated by the technology is better than the emission requirement of the household garbage landfill and pollution control standard (GB16889-2008), and the quality of purified water meets the recycle requirement, so that the near-zero emission of the garbage percolate can be realized.

A flexible diffuser membrane is provided with a unique system of perforations arranged to result in uniform distribution of gas even though the membrane deflects to different extents or the submergence varies in different parts of the membrane. The perforations are arranged to provide less perforation area per unit of perforated membrane surface area in the membrane parts that deflect the most or are submerged least and greater perforation area in membrane parts that deflect the least or are submerged most. The perforations can be slits arranged in parallel rows on a tubular membrane, in concentric circles or another pattern on a disk membrane, or in still a different pattern on a flat panel diffuser membrane. The slit length or separation can be varied between different zones on the membrane surface or the spacing between rows or circles can be varied.

A thin sheath of flexible, flaccid material is introduced through openings in the body of an animal or human patient to permit surgical tools or fluids to be inserted and removed, or debris removed, during surgeries anywhere in the body to protect the tissue of the body from the instruments used. The sheath is inserted by an obturator which holds the sheath thereon by suction through an aperture in the obturator at its distal end. Once the sheath is inserted, suction is removed to release the sheath. Then a balloon on the distal end of the sheath is expanded to hold the sheath in place in the body while the obturator is removed. The sheath then remains in place with the balloon holding the distal end in the open position to enable fluids to flow through the sheath. After a procedure, the balloon is deflated and the sheath removed.

A system and method for closing a percutaneous vessel puncture at the conclusion of a vascular catheterization procedure includes placement of an intravascular closure device having a radially and axially expandable tubular membrane and a radially expandable anchor at the distal sad of the membrane. The closure device is placed, by a delivery catheter extending through the puncture site, with its anchor radially expanded in a location upstream of the puncture site to enable the force of a patient's blood flow to deploy the tubular membrane to a proximally extended configuration closing the puncture from within the vessel.