2985results about How to "Control flow" patented technology

A tissue ablation system is described. The tissue ablation system can include a plurality of electrodes, a viewing window between adjacent electrodes, illuminating elements, and an image sensor. The image sensor can be a CMOS device.

In one embodiment of the present inventions, an exhaust outlet in a vacuum processing chamber includes a nonsealing flow restrictor which can facilitate rapid opening and closing of the flow restrictor in some applications. Because the flow restrictor is a nonsealing flow restrictor, the conductance of the flow restrictor in the closed position may not be zero. However, the flow restrictor can restrict the flow of an exhaust gas from the chamber to permit the retention of sufficient processing gas in the chamber to deposit a film on the substrate or otherwise react with the substrate. After a film has been deposited, typically in a thin atomic layer, the exhaust flow restrictor may be opened such that the flow restrictor conductance is significantly increased to a second, higher flow rate to facilitate exhausting residue gas from the chamber. The nonsealing flow restrictor may be closed again to deposit a second layer, typically of a different material onto the substrate. The nonsealing flow restrictor may be rapidly opened and closed to deposit alternating layers of a variety of materials onto the substrate.

A method of dispensing a therapeutic fluid from a line includes providing an inlet line connectable to an upstream fluid source. The inlet line is in downstream fluid communication with a pumping chamber. The pumping chamber has a pump outlet. The method also includes actuating a force application assembly so as to restrict retrograde flow of fluid through the inlet while pressurizing the pumping chamber to urge flow through the pump outlet. A corresponding system employs the method.

A leadless intravascular sensor (100, 200) uses the body tissue as a communication medium. The implantable intravascular device has a tubular stent-like structure (102) for intravascular fixation with embedded microcircuits to allow bipolar and unipolar sensing of cardiac and neurologic electrical activity, sensing of other physiologic signals, local electrical stimulation (cardiac pacing and defibrillation; neurologic stimulation and seizure therapy) as well as the ability to communicate with other implanted and non implanted devices via radio frequency and/or optical communication and/or analog signal communication using the body tissue as the conducting medium. The device can also be used in the extravascular or perivascular space. In this form, it has an open/flexible ring that can be adjusted, or self-adjusts to provide no pressure or required contact around the vessel or target region.

An apparatus and method are disclosed for treating overweight and obese patients by applying a restrictive Artificial Gastric Valve (AGV) on part of the stomach. The apparatus includes a mechanism to control the opening of the AGV automatically on demand, dynamically and progressively. The controlled opening of the AGV inside the stomach controls and regulates the flow of food.

A wafer carrier assembly for use in a system for growing epitaxial layers on one or more wafers by chemical vapor deposition (CVD), the wafer carrier assembly includes a wafer carrier body formed symmetrically about a central axis, and including a generally planar top surface that is situated perpendicularly to the central axis and a planar bottom surface that is parallel to the top surface. At least one wafer retention pocket is recessed in the wafer carrier body from the top surface. Each of the at least one wafer retention pocket includes a floor surface and a peripheral wall surface that surrounds the floor surface and defines a periphery of that wafer retention pocket. At least one thermal control feature includes an interior cavity or void formed in the wafer carrier body and is defined by interior surfaces of the wafer carrier body.

Freeze wells may be used to isolate an area for soil remediation. Freeze wells may form a frozen barrier around a treatment area. The frozen barrier may inhibit fluid from entering into the treatment area. The frozen barrier may also inhibit migration of contamination out of the treatment area. The frozen barrier may be used to surround all of the perimeter of the treatment area. A frozen barrier may also be formed above or below a treatment area. Freeze wells may be activated in advance of soil remediation so that a frozen barrier is formed when soil remediation is begun. The soil remediation may be accomplished by any type of soil remediation system, including a thermal soil remediation system. Heaters of a thermal soil remediation system may be may be placed close to the frozen barrier without the barrier being broken through during remediation.

A respirator 10 that has a mask body 14 and a malleable nose clip 12. The mask body 14 is adapted to fit at least over the nose and mouth of a person to define an interior gas space that is separate from the exterior gas space. The mask body 14 has the nose clip 12 secured to it and can include at least one layer of filter media 20. The malleable nose clip 12 comprises a semi-crystalline polymeric material that has an integrated diffraction intensity ratio of at least about 2.0. The nose clip 12 can be deformed into a desired configuration that enables the mask body 14 to maintain a snug fit over a person's nose when the respirator is worn for extended time periods. Because the nose clip 12 does not need to contain metal, the whole respirator 10 can be easily processed as waste in an incinerator when its service has ended.

A medical implant (20) includes first and second ring members (22,24), each including a resilient framework (26) having a generally cylindrical form. A tubular sleeve (28) is fixed to the first and second ring members so as to hold the ring members in mutual longitudinal alignment, thereby defining a lumen (32) passing through the ring members. A constricting element (30) is fit around the sleeve at a location intermediate the first and second ring members so as to reduce a diameter of the lumen at the location.

This invention relates to processes and systems of rapid prototyping and production. Its features includes flexible material deposition along tangential directions of surfaces of a part to be made, thereby eliminating stair-shape surface due to uniform horizontal layer deposition, increasing width of material deposition to increase build up rate, applying the principles of traditional forming/joining processes, such as casting, fusion welding, plastic extrusion and injection molding in the fabrication process so that various industrial materials can be processed, applying comparatively low cost heating sources, such as induction heating and arc-heating. Additional features include varying width and size of material deposition in accordance with geometry to be formed and applying a differential molding means for improved shape formation and surface finishing.