820results about How to "Avoid high pressure" patented technology

The present invention is a replacement mitral valve suitable for catheter-based deployment. The replacement mitral valve has structure and dimensions that are uniquely suited to engage the annulus surrounding the native mitral valve and to restore normal function to a diseased valve. The invention describes the structures and functions of a replacement mitral valve and methods that are adapted for minimally invasive, catheter-based deployment of the valve.

The invention relates to a method for calibrating an analyte-measurement device that is used to evaluate a concentration of analyte in bodily fluid at or from a measurement site in a body. The method involves measuring a concentration, or calibration concentration, of an analyte in blood from an “off-finger” calibration site, and calibrating the analyte-measurement device based on that calibration concentration. The invention also relates to a device, system, or kit for measuring a concentration of an analyte in a body, which employs a calibration device for adjusting analyte concentration measured in bodily fluid based on an analyte concentration measured in blood from an “off-finger” calibration site.

A urological balloon catheter has electrodes in a region of its shaft proximally adjoining the balloon, which electrodes lie uncovered on the outer surface of the shaft and can be connected to a high-frequency generator via lines which run through the shaft in the proximal direction.

Embodiments of the present invention are related to a pumping system that accurately dispenses fluid using a multiple stage (“multi-stage”) pump. More particularly, embodiments of the present invention provide for control of a feed stage pump to regulate fluid pressure at a downstream dispense stage pump. According to one embodiment of the present invention, a pressure sensor at the dispense stage pump determines the pressure in a dispense chamber. When the pressure reaches a predefined threshold, the dispense stage pump can begin to increase the available volume of the dispense chamber, thereby causing the pressure in the dispense chamber to drop. As the pressure decreases/increases at the downstream pump, the pressure applied by the upstream pump can bed increased/decreased.

A nasal dilator comprises a laminate of vertically stacked layers forming a unitary, or single body, truss where each layer includes at least one member. The truss features horizontal regions adapted to engage outer wall tissues of first and second nasal passages and to traverse the bridge of a nose therebetween. When in use the dilator acts to stabilize and/or expand the nasal outer wall tissues and prevent said tissues from drawing inward during breathing. Manufacturing methods produce dilator layers and/or finished nasal dilator devices efficiently at the same or lower cost as traditional methods by fabricating dilator elements in whole or part along common lines or edges. Said common lines define peripheral dimensions and form spaced apart relationships between dilator layers, members and finished dilator devices without sacrificing usable material to do so. Manufacturing steps include cutting through a fabrication laminate along lines defining at least portions of one or more layers, members, and the truss's peripheral edges. Manufacturing methods further maximize material usage by incorporating waste material into a subsequent fabrication process. Dilator embodiments further include means for providing disparate dilating force to opposing nasal passages, and means for incorporating promotional printing into the dilator fabrication process.

Pressure-sensitive adhesives for optical films exhibit high cohesion, excellent re-workability, adhesion properties, heat resistance and durability without chemical crosslinking.

A pressure-sensitive adhesive contains an acrylic triblock copolymer (I) at not less than 60% by mass based on the total mass of all solids contained in the pressure-sensitive adhesive, the acrylic triblock copolymer being represented by the formula A1-B-A2 wherein: A1 and A2 are each independently an alkyl methacrylate polymer block having Tg of not less than 100° C. and B is an acryl acrylate polymer block having Tg of not more than −20° C.; the content of the polymer block B is 50 to 95% by mass; Mw is in the range of 50,000 to 300,000; and the molecular weight distribution is in the range of 1.0 to 1.5. In a preferred embodiment, the acrylic triblock copolymer (I) is a combination of an acrylic triblock copolymer (Ia) having Mw of 50,000 to less than 100,000 and an acrylic triblock copolymer (Ib) having Mw of 100,000 to 300,000, in a mass ratio (Ia):(Ib) of 45:55 to 75:25.

A nasal dilator is constructed as a single body truss having a resilient member structure comprising a plurality of overlaid, island-placed, or overlapping resilient members. Methods of mass producing dilator devices, individual resilient members, and overlapped, overlaid, and island-placed resilient member structures are also disclosed.

A method for drilling, running casing in, and/or cementing a borehole in a subterranean formation without significant loss of drilling fluid is disclosed, as well as compositions for use in such method. The method employs a drilling fluid comprising a fragile gel or having fragile gel behavior and providing superior oil mud rheology and overall performance. The fluid is especially advantageous for use in deep water wells because the fluid exhibits minimal difference between downhole equivalent circulating density and surface density notwithstanding differences in drilling or penetration rates. When an ester and isomerized olefin blend is used for the base of the fluid, the fluid makes an environmentally acceptable and regulatory compliant invert emulsion drilling fluid. The fluid preferably contains no organophilic clays.

The present invention provides an active gas regenerative liquefier (AGRL) for efficiently cooling and liquefying a process stream based on the combination of several active gas regenerative refrigerator (AGRR) stages configured to sequentially cool and liquefy the process stream, e.g. natural gas or hydrogen. In specific embodiments, the individual AGRR stages include heat exchangers, dual active regenerators, and a compressor/expander assembly, configured to recover a portion of the work of compression of a refrigerant by simultaneously expanding a refrigerant in one portion of the device while compressing the refrigerant in another portion to effect cooling of a heat transfer fluid, and ultimately the process stream.

A task management methodology for system having multiple processors and task queues adapts a queuing topology by monitoring a queue pressure and adjusting the queue topology from a selection of at least two different queue topologies. The queue pressure may be periodically monitored and queues with different granularities selected. The methodology reduced contention when there is high pressure on the queues while also reducing overhead to manage queues when there is less pressure on the queues.

A perfusion system for non-surgically isolating and perfusing an organ, particularly the liver (101), in a patient, and including; by-pass cathether apparatus having inlet and outlet lumens (111, 112) introducible into the blood vessels of the organ percutaneously and devised so as to by-pass the blood flow past the organ in a by-pass circuit; perfusion catheter apparatus having inlet and outlet lumens (114, 116) introducible into the blood vessels percutaneously and being devised so as to lead the flow of perfusion fluid in a perfusion circuit through the organ; occlusive seals (106, 108) for isolating the organ from the systemic blood flow; pump apparatus including a by-pass pump (261), a perfusion fluid pump (124) and a suction pump (134) for establishing a negative relative pressure at the perfusion outlet from the organ; and control apparatus (128) coupled to the pumps (124, 126, 134) so as to control the operation thereof such that the outflow of fluid from the organ exceeds the inflow of fluid into the organ in the perfusion circuit due to a net volume contribution of blood from the systemic circulation entering the isolated organ.

The invention relates generally to a method and system for monitoring traffic events at a predetermined location, using a temporary video camera set up to record traffic movements through an intersection or other location along a road. The method preferably comprises taking a video recording of the location, and then sending the recording to a foreign country where the recording can be reviewed manually at a reduced cost. To facilitate an accurate and consistent review of the recording, the invention preferably uses “event lines” that can be superimposed on the video monitor, wherein the event lines help determine when a vehicle has passed through an intersection, i.e., when a recordable traffic event occurs. The system also preferably uses a computer-operated program adapted to assist the operator in reviewing, verifying and summarizing the recorded information, wherein a particular key or keys can be pressed depending on the type of event to be indicated. The system is also able to identify the exact frame number of a recordable event that corresponds to an exact moment in real time, i.e., when the event actually occurred. A tripod-like apparatus for temporarily setting up a video camera in locations where no existing pole or structure is available, as well as a tamper-proof housing in which the video recording device can be temporarily mounted, can also be provided.

The invention discloses a controlling method of an air-source water heater. The control of the air-source water heater is realized based on a timing water consumption mode, and a timing switch is utilized to automatically regulate the opening/stopping time of the water heater according to the outdoor environmental temperature daily range; in use, a user directly sets the time and the temperature of water consumption, and the air-source water heater selects to start the water heater for heating at the higher outdoor environmental temperature. The invention has the following advantages that: firstly, the time and the temperature of the water consumption are directly set, which is more human-friendly and is convenient for the user to operate and use; secondly, the air-source water heater selects to work at the higher outdoor environmental temperature by utilizing the outdoor environmental temperature daily range so as to improve the heating effect of the air-source water heater as large as possible and realize the energy saving operation of the air-source water heater.

Disclosed is a vortex-based centrifugal separator for removing solids from a liquid/solids fluid stream in two stages. A fluid stream under pressure is introduced at the top of the cylindrical separator at a tangential angle forming helical downward flow. The first stage uses a centrally-located spin plate for reversing the cleaner interior flow of the vortex back upward, while the heavier solids settle at the bottom of the chamber for periodic removal. In the second stage, a plurality of louvered slots in an upper discharge pipe remove finer solids from the exiting upward fluid flow prior to discharge.

The invention relates to a process for the production of synthesis gas from a hydrocarbon feedstock, wherein the entire hydrocarbon feed is passed through a radiant furnace, heat exchanger reformer and autothermal reformer in a series arrangement, and in which effluent gas from the autothermal reformer is used as heat source for the reforming reactions occurring in the heat exchange reformer.