摘要:
Methods and systems for navigating medical devices are provided. A patient is imaged while a medical device is moved within the patient. A position (e.g., a location and/or orientation) of the moving medical device is detected within a coordinate system (e.g., a three-dimensional coordinate system), a position of the imaging field of view relative to the patient is adjusted based on the detected medical device position, such that the relevant tissue region of the patient is within the field of view. For example, the field of view can be centered over the medical device or centered just distal to the medical device portion. The direction of view may be oriented at an angle perpendicular to the axis of the medical device, e.g., for more accurately measuring the length of objects within the field of view, or oriented at an angle parallel to the axis of the medical device portion, e.g., for more accurately measuring the diameter of the channel (e.g., blood vessel) in which the medical device is disposed.
摘要:
A fastener driving device for use in driving a fastener into an elongated contoured portion of a workpiece is disclosed. The elongated contoured portion has a surface that is contoured perpendicular to a longitudinal direction of the elongated contoured portion. The device includes a contact arm that is operatively connected with the trigger assembly, and a contoured contact foot for engaging the workpiece. The contact arm is constructed and arranged to move relative to a housing assembly of the driving device when the contact foot is pressed against the workpiece. The contact foot has a contoured engaging surface that includes a recess that is shaped to generally complement the shape of the contoured surface of the workpiece.
摘要:
The present invention provides methods for rapidly determining the function of nucleic acid sequences by transfecting the same into a host organism to effect expression. Phenotypic and biochemical changes produced thereby are then analyzed to ascertain the function of the nucleic acids which have been transfected into the host organism. The invention also provides methods for silencing endogenous genes by transfecting hosts with nucleic acid sequences to effect expression of the same. The present invention also provides methods for selecting desired functions of RNAs and proteins by the use of virus vectors to express libraries of nucleic acid sequence variants. Moreover, the present invention provides methods for inhibiting an endogenous protease of a plant host.
摘要:
A planar polarizer feed network comprising a six port branch coupler having two input ports and four output ports. The output ports are designed to have the same amplitude while their phases are sequentially offset by 90 degrees when fed from a first input port or by minus 90 degrees when fed from a second input port. In one embodiment, each output port is coupled to an aperture coupled antenna array comprising four slots and four patch antenna elements. In this arrangement, an RF signal may be coupled to each of the two input ports to couple properly phased signals to each of the antenna elements to simultaneously form both right-hand and left-hand circularly polarized signal emitted from the planar array of antenna elements.
摘要:
A catheter assembly which has a distal end adapted for insertion into a living body and a proximal end adapted to remain external to said body or a cable for use in such an assembly includes a cylindrical surface on which are inscribed a plurality of markings. Each of the markings indicates one of the specific locations within the living body at which the distal end may be placed during insertion. The markings are positioned at spaced intervals around the circumference of the cylindrical surface. A sleeve is rotatably and/or axially movable around the cylindrical surface, the sleeve being provided with at least one window adapted to be moved into alignment with a selected one of the markings.