195results about How to "Minimize reflection" patented technology

A collapsible ultrasonic reflector incorporates a gas-filled reflector balloon, a liquid-filled structural balloon an ultrasonic transducer disposed within the structural balloon. Acoustic energy emitted by the transducer is reflected by a highly reflective interface between the balloons. In a cardiac ablation procedure, the ultrasonic energy is focused into an annular focal region to ablate cardiac tissue extending in an annular path along the wall. Devices for stabilizing the balloon structure and for facilitating collapse and withdrawal of the balloon structure are also disclosed.

Systems and methods are provided for applying a high frequency voltage in the presence of an electrically conductive fluid to create a relatively low-temperature plasma for ablation of tissue adjacent to, or in contact with, the plasma. In one embodiment, an electrosurgical probe or catheter is positioned adjacent the target site so that one or more active electrode(s) are brought into contact with, or close proximity to, a target tissue in the presence of electrically conductive fluid. High frequency voltage is then applied between the active electrode(s) and one or more return electrode(s) to non-thermally generate a plasma adjacent to the active electrode(s), and to volumetrically remove or ablate at least a portion of the target tissue. The high frequency voltage generates electric fields around the active electrode(s) with sufficient energy to ionize the conductive fluid adjacent to the active electrode(s). Within the ionized gas or plasma, free electrons are accelerated, and electron-atoms collisions liberate more electrons, and the process cascades until the plasma contains sufficient energy to break apart the tissue molecules, causing molecular dissociation and ablation of the target tissue.

A sub-reflector for a dish reflector antenna with a waveguide supported sub-reflector. The sub-reflector formed from a dielectric block, concentric about a longitudinal axis. The dielectric block having a first diameter waveguide junction portion adapted for coupling to an end of the waveguide and a sub-reflector surface coated with an RF reflective material having a periphery with a second diameter larger than the first diameter. A leading cone surface extends from the waveguide junction portion to the second diameter at an angle. The sub-reflector surface and the leading cone surface having a plurality of non-periodic perturbations concentric about the longitudinal axis.

A display system for suspending visuals for exhibit, training or advertising made up of an assembly of commercially available items, and used to display a banner or sign in a manner that is particularly useful on the set of a local television station. One embodiment has elastic cords, slotted tubular members, floor anchors, cord hooks, cord locks and a ceiling interface. When a rigid sign is situated with its bottom edge positioned in the lower tubular member slot and its top edge in the upper tubular member slot, the sign is suspended for viewing. In another embodiment, horizontal rods are supported by two tubular members with portions of the rods extended beyond the ends the tubular members. Several banner clips are used to clip a banner to the portions of the rods extending beyond the ends of the tubular members to suspend the banner for viewing. Other embodiments incorporate more than one set of either slotted tubular members or rod-supporting tubular members, or a combination of slotted tubular members and rod-supporting tubular members.

A method of turning the surface of a die, which is used to make a product, into an antireflective roughened one includes the steps of: a) producing a first roughness on the surface of the die; and b) producing a second roughness, which is smaller than the first roughness, on the surface of the die on which the first roughness has already been produced.

Lithographic apparatus providing a patterned beam of radiation in which radiation that is linearly polarized in a first direction has a first pattern and radiation that is linearly polarized in an orthogonal direction has a second pattern.