1204 results about "Concentric ring" patented technology

A delivery system and method for delivering a prosthetic heart valve to the aortic valve annulus. The system includes a balloon catheter having a steering mechanism thereon for delivering a balloon-expandable prosthetic heart valve through an introducer in an antegrade fashion to the aortic annulus. The balloon catheter passes through an introducer that accesses the left ventricle through its apex and a small incision in the chest wall. The balloon catheter includes a deflecting segment just proximal to the distal balloon to facilitate positioning of the prosthetic heart valve in the proper orientation within the aortic annulus. A slider in a deflection handle may be coupled to a deflection wire that actuates the deflecting segment. The method includes using two concentric rings of purse-string sutures around the puncture in the left ventricular apex to maintain a good seal around instruments passed therethrough. The prosthetic heart valve may be installed over the existing calcified leaflets, and a pre-dilation valvuloplasty procedure may also be utilized.

Disclosed are devices and methods for detecting, preventing, and/or treating neurological disorders. These devices and methods utilize electrical stimulation, and comprise a unique concentric ring electrode component. The disclosed methods involve the positioning of multiple electrodes on the scalp of a mammal; monitoring the mammal's brain electrical patterns to identify the onset of a neurological event; identifying the location of the brain electrical patterns indicative of neurological event; and applying transcutaneous or transcranial electrical stimulation to the location of the neurological event to beneficially modify brain electrical patterns. The disclosed methods may be useful in the detection, prevention, and/or treatment of a variety of indications, such as epilepsy, Parkinson's Disease, Huntington's disease, Alzheimer's disease, depression, bipolar disorder, phobia, schizophrenia, multiple personality disorder, migraine or headache, concussion, attention deficit hyperactivity disorder, eating disorder, substance abuse, and anxiety. The disclosed methods may also be used in combination with other peripheral stimulation techniques.

A mitral heart valve annuloplasty ring having a posterior bow that conforms to an abnormal posterior aspect of the mitral annulus. The ring may be generally oval having a major axis and a minor axis, wherein the posterior bow may be centered along the minor axis or offset in a posterior section. The ring may be substantially planar, or may include upward bows on either side of the posterior bow. The ring may include a ring body surrounded by a suture-permeable fabric sheath, and the ring body may be formed of a plurality of concentric ring elements. The ring is semi-rigid and the posterior bow is stiff enough to withstand deformation once implanted and subjected to normal physiologic stresses. The ring elements may be bands of semi-rigid material. A method of repairing an abnormal mitral heart valve annulus having a depressed posterior aspect includes providing a ring with a posterior bow and implanting the ring to support the annulus without unduly stressing the attachment sutures.

A system 10 for controlling the automatic scrolling of information on a computer display or screen 12 is disclosed. The system 10 generally includes a computer display or screen12, a computer system 14, gimbaled sensor system 16 for following and tracking the position and movement of the user's head 18 and user's eye 20, and a scroll activating interface algorithm using a neural network to find screen gaze coordinates implemented by the computer system 14 so that corresponding scrolling function is performed based upon the screen gaze coordinates of the user's eye 20 relative to a certain activation area(s) on the display or screen 12. The gimbaled sensor system 16 contains a gimbaled platform 24 mounted at the top of the display or screen 12. The gimbaled sensor system 16 tracks the user's 22 head 18 and eye 20, allows the user to be free from any attachments while the gimbaled sensor system 16 is eye tracking, and still allows the user to freely move his or her head when the system 10 is in use. A method of controlling automatic scrolling of information on a display or screen 12 by a user 22 is also disclosed. The method generally includes the steps of finding a screen gaze coordinate 146 on the display or screen 12 of the user 22, determining whether the screen gaze coordinate 146 is within at least one activated control region, and activating scrolling to provide a desired display of information when the gaze direction is within at least one activated control region. In one embodiment, the control regions are defined as upper control region 208, lower region 210, right region 212, and left region 214 for controlling the scrolling respectively in the downward, upward, leftward, and rightward directions. In another embodiment, the control regions are defined by concentric rings 306, 308, and 310 for maintaining the stationary position of the information or controlling the scrolling of the information towards the center of the display or screen 12.

A system for controlling the automatic scrolling of information on a computer display. The system includes a computer display, a computer gimbaled sensor for tracking the position of the user's head and user's eye, and a scroll activating interface algorithm using a neural network to find screen gaze coordinates implemented by the computer. A scrolling function is performed based upon the screen gaze coordinates of the user's eye relative t activation area(s) on the display. The gimbaled sensor system contains a platform mounted at the top of the display. The gimbaled sensor system tracks the user's head and eye allowing the user to be free from attachments while the gimbaled sensor system is tracking, still allowing the user to freely move his head. A method of controlling automatic scrolling of information on a display includes the steps of finding a screen gaze coordinate on the display of the user determining whether the screen gaze coordinate is within at least one activated control region, and activating scrolling to provide a desired display of information when the gaze direction is within at least one activated control region. In one embodiment, the control regions are defined as upper control region, lower region, right region and left region for controlling the scrolling respectively in downward, upward, leftward and rightward directions. In another embodiment, control regions are defined by concentric rings for maintaining the stationary position of the information or controlling the scrolling of the information towards the center of the display or screen.

The invention discloses a concentric-ring sprayer structure for material vapor phase epitaxy, which solves the problem that the large-area deposition region provides a uniform flow field of a precursor gas mixture in a large-substrate or multi-substrate crystal growth process. The sprayer structure comprises more than one independent air inlet pipeline, wherein each air inlet pipeline is provided with a controller for monitoring and regulating inlet gas flow speed and flow rate; the bottom of the sprayer is provided with an air outlet baffle; more than one concentric ring is arranged in the sprayer; independent cavities are formed among the concentric rings and are mutually separated; the top end of each concentric ring is connected with one independent air inlet pipeline; and the air outlet baffle at the bottom end of each concentric ring is provided with one or more air outlets. The air sources are mutually separated and independently controlled; and the multi-sprayer integrated use mode obviously improves the quality of the large-area deposited grown crystal, and greatly enhances the production efficiency.

A computing device having a graphical interface system for navigating computer programs is provided. The system includes a navigation display showing an organizational model of a computer program that is formed by concentric rings representing levels of options within the computer program. At least one of the rings is an active ring, which is emphasized to show selectable options. The options represent either categories of other options or features of the computer program. The options may be represented by icons or words. A method for navigating a computer program using the organizational model includes using a graphical user interface to select options on an active ring. Selecting a category option activates an inner ring that displays options related to the previously selected option on the next higher ring. The user continues navigating through inner rings until a feature option is selected, which invokes a feature of the computer program.

An object position and orientation detection system and in particular one which is capable of describing observed movement in 3 dimensions. In one example, a spherical patterned marker with concentric rings is imaged using one or more digital cameras, and the resulting images are processed to determine the position and orientation of an object to which the patterned marker is attached. The method of optical tracking employed by the system allows motion to be determined in six degrees of freedom. In conjunction with a suitable display, such as a projector, an interactive white board or similar application can be realised.

The airborne radio-relay system includes a network control station, at least one ground station, airborne cluster controller relay stations, and one or more non-airborne stations, which may be mobile. The network control station accesses a database providing real-time four dimensional position information regarding air stations in the national and international airspace, and dynamically designates and redesignates particular airborne stations to repeat traffic in response to changing air traffic patterns so that concentric rings of overlapping relay stations are maintained. Transmitting stations use time division duplex techniques to transfer traffic, which includes packet switched data communications traffic.

A printed image is disclosed wherein the image may be in the form of an array of magnetically aligned platelets or flakes that may by uniform in shape and size and wherein the flakes are arranged in a particularly manner to form optically illusive images useful as security devices, or useful in beam steering applications. In one embodiment of this invention printed array is disclosed a plurality of concentric rings of magnetically aligned platelets disposed upon a substrate in the form of a Fresnel structure, preferably a Fresnel reflector. Advantageously, since the magnetic field can be controlled with respect to strength and direction, one can easily design a field that will correct for spherical aberration that would otherwise be present in a typical Fresnel reflector. In other embodiments of the invention optically illusive images of funnels, domes and cones are printed.

A user interlace component for an electronic device having a display. The user interface component, when instantiated is arranged to provide a representation of a hierarchical structure of interlinked objects arranged in a plurality of levels. The representation is displayed as a plurality of concentric rings, each corresponding to a given one of the plurality of levels. The instance of the user interface component is responsive to user interaction therewith to rotate one of the rings, whereby at least one of the objects is rotated out of view, and the instance of the user interface component is responsive to the user selecting an object in a ring to display a limited number of interlinked objects in a connected ring.

A surge protection element for a conventional cable connector includes a printed circuit board preferably shaped as two concentric rings connected by two spokes. The outer ring is electrically connected to the grounded portion of the cable connector body. A printed circuit trace on one of the spokes is separated from a printed circuit trace on the inner ring by a spark gap. If a high voltage surge is carried by the coaxial cable transmission line, a spark is formed in the gap. As a consequence, the high voltage surge is transferred to the surge protection element which in turn conducts the electricity to the grounded body of the connector.

A showerhead as described herein includes a translucent hollow body having a fluid chamber, and a fluid distribution element configured to release fluid contained in the fluid chamber. The fluid distribution element includes a plurality of raised concentric rings having peaks that serve as the fluid release points. The fluid distribution element contains a number of fluid ducts that are specifically shaped to transport the fluid from the fluid chamber toward the fluid release points. The translucent nature of the showerhead creates an optical lens effect that illuminates the showerhead and the water droplets formed by the showerhead. The illumination of the water droplets creates a pleasant showering experience for the user.

An optical fiber having a longitudinal direction and a cross-section perpendicular thereto, the optical fiber includes a core region; and a micro-structured cladding region, the cladding region surrounding the core region and having longitudinally extending micro-structure cladding elements arranged in a background cladding material, the micro-structured cladding elements having cross-sectional sizes which are equal or different, at least a number of the cladding elements being arranged in a substantially two dimensional periodic manner or a Bragg-type of manner, such as concentric rings of cladding elements surrounding the core, and the at least a number of the cladding elements are filled in at least one longitudinally extending section of the optical fiber with a liquid crystal material. The at least one filled section exhibits a photonic bandgap effect for at least one phase state of the liquid crystal.

An elastic strain sensor can be incorporated into an artificial skin that can sense flexing by the underlying support structure of the skin to detect and track motion of the support structure. The unidirectional elastic strain sensor can be formed by filling two or more channels in an elastic substrate material with a conductive liquid. At the ends of the channels, a loop port connects the channels to form a serpentine channel. The channels extend along the direction of strain and the loop portions have sufficiently large cross-sectional area in the direction transverse to the direction of strain that the sensor is unidirectional. The resistance is measured at the ends of the serpentine channel and can be used to determine the strain on the sensor. Additional channels can be added to increase the sensitivity of the sensor. The sensors can be stacked on top of each other to increase the sensitivity of the sensor. In other embodiments, two sensors oriented in different directions can be stacked on top of each other and bonded together to form a bidirectional sensor. A third sensor formed by in the shape of a spiral or concentric rings can be stacked on top and used to sense contact or pressure, forming a three dimensional sensor. The three dimensional sensor can be incorporated into an artificial skin to provide advanced sensing.

The flow conditioner for a gas transport pipe comprises at least one perforated plate disposed essentially perpendicularly to the axis XX' of the pipe and comprising a central hole and sets of additional holes that are regularly distributed over at least three concentric rings centered on the axis of the pipe so as to define a perforated plate that is axially symmetrical. Within any one ring all of the circular holes are of the same diameter d1, d2, d3. On going away from the central hole and on passing from any one ring to an adjacent concentric ring, the diameter of the holes changes alternately in a reduction direction and in an increase direction. Each ring has a number of holes that is equal to or greater than six. The perforated plate is advantageously associated with a porous plate situated upstream from the perforated plate and parallel thereto.

Welding electrodes with a welding face for contact with a metal surface for electrical resistance welding are provided with concentric contoured rings formed into the face. The rings may, for example, be ridges upstanding in the face or grooves depressed into the face. The contoured rings may be radially spaced with relatively flat (depending on the curvature of the face) intervening rings. When the electrode is pressed into contact with the surface of the workpiece for delivery of a welding current, the features of the concentric rings penetrate surface oxides or other conductivity barriers. When ongoing welding operations have eroded the contoured rings they may be rapidly reformed in the weld face in a surface re-dressing operation.

A system and method for determining endoscopic dimensional measurements including a projector assembly comprising a light source for projecting light through a telecentric lens and into a surgical site, and a mask coupled to the projector assembly. Light projected from the light source projects through the mask. The projected light through the mask may be a collimated pattern which does not significantly change in size as a function of the distance to a projected plane. The projected light patterns may include multiple wavelengths of light for measurements of different features of tissue and may be produced using a laser in conjunction with a light shaping optical diffuser, or using a light emitting diode in conjunction with a light shaping optical diffuser, or using a spatial filter. The projected light patterns may take the form of concentric rings with each ring representing a radius of a given dimension.

The invention relates to a system for visualizing, in a first bull's eye plot, results of a first quantitative analysis of an object represented in first image data, in particular for cardiac analysis. The first image data comprises a first plurality of data slices, and the system comprises a slice unit for associating a data slice of the first plurality of data slices with a concentric ring of the first bull's eye plot, a radius unit for computing the length of a radius of the concentric ring of the first bull's eye plot, and a value unit for computing at least one value for displaying in the concentric ring of the first bull's eye plot, on the basis of the data slice associated with the concentric ring of the first bull's eye plot, and wherein the length of the radius of the concentric ring of the first bull's eye plot is defined on the basis of the position of the data slice, of the first plurality of data slices, associated with the concentric ring of the first bull's eye plot, with respect to the object. The dependence of the first bull's eye plot concentric ring radius on the position of the data slice associated with said concentric ring of the first bull's eye plot, with respect to the object, defines an objective framework for the first bull's eye plot, based on the geometry of the object. Thus, the results of the first quantitative analysis of the object visualized in the first bull's eye plot can be more easily compared with results of a second quantitative analysis of the same object represented in second image data visualized in a second bull's eye

The invention is a method for making a master mold to be used for nanoimprinting patterned-media magnetic recording disks. The method uses conventional optical or e-beam lithography to form a pattern of generally radial stripes on a substrate, with the stripes being grouped into annular zones or bands. A block copolymer material is deposited on the pattern, resulting in guided self-assembly of the block copolymer into its components to multiply the generally radial stripes into generally radial lines of alternating block copolymer components. The radial lines of one of the components are removed and the radial lines of the remaining component are used as an etch mask to etch the substrate. Conventional lithography is used to form concentric rings over the generally radial lines. After etching and resist removal, the master mold has pillars arranged in circular rings, with the rings grouped into annular bands.