摘要:
A method is described of inserting guide wires into a lumen, for example into the human gastrointestinal tract. A guide wire structure is employed which comprises at least two guide wires (1, 2) each having a leading end portion which terminates in a leading end, the guide wires being connected to one another by a junction (3) at or adjacent their leading ends, the guide wires have a first position in which the leading end portions are substantially parallel to one another, a second position in which theleading end portions are curved, and a third position in which at least one of the leading end portions forms a loop. The guide wire structure is steered through the gastrointestinal tract by selectively advancing or retracting a single guide wire or advancing more than one guide wire simultaneously, according to the path which is required to be followed.
摘要:
A method and system for reducing arbitration latency employs speculative transmission (STX) without prior arbitration in combination with routing fabric (306) scheduled arbitration. Packets are sent from source locations (321) to a routing fabric (306) through scheduled arbitration, and also through speculative arbitration, to non- contentiously allocate outputs that were not previously reserved in the routing fabric (306) to the speculatively transmitted packets.
摘要:
An optical fiber comprising: a glass core extending from a centerline to a radius R1; a glass cladding surrounding and in contact with the core, the cladding comprising: a first annular region extending from R1 to a radius R2, the first annular region comprising a radial width, W2 = R2 - R1, a second annular region extending from R2 to a radius R3, the second annular region comprising a radial width, W3 = R3 - R2, and a third annular region extending from R3 to an outermost glass radius R4; wherein (i) the core comprises a maximum relative refractive index, Δ1MAX, relative to the third annular region; (ii) wherein the first annular region comprises a radial widthW2; and (iii) the second annular region comprises a minimum relative refractive index, Δ3MIN, relative to the third annular region wherein Δ1MAX > Δ2MAX > Δ3MIN, and Δ2MIN > Δ3MIN; and the core and the cladding provide a fiber with cable cutoff less than 1500 nm, dispersion at 1550 nm less than 12 ps/nm/km, effective area at 1550 nm greater than 60 µm2, and preferably greater than 70 µm2. The second annular cladding region may contain a plurality of randomly dispersed holes.
摘要:
A surgical device is provided for use in joining a first tissue layer forming a first hollow region and a second tissue layer forming a wall of a second hollow region, to produce an anastomosis. The device comprises a needle capable of passing from the first region to the second region by penetrating the tissue layers, a tag removably carried by the needle, the tag having a trailing portion, and means for separating the tag from the needle after the needle has penetrated both layers, to leave the tag in the second hollow region, but with the trailing portion extending into the first hollow region. Anastomosis forming articles are described which comprise a pair of components for compressing the tissue layers between them.
摘要:
Methods for producing optical fibers along nonlinear paths include incorporating fluid bearings. An optical fiber is drawn from a preform along a first pathway, contacted with a region of fluid cushion of a fluid bearing, and redirected along a second pathway as the fiber is drawn across said region of fluid cushion.
摘要:
An optical fiber that includes a central core (34) having a maximum dimension (A) greater than a minimum dimension (B), preferably with an aspect ratio greater than 1.5, the fiber having at least one air hole (24, 26) positioned on opposite sides of the central core and extending along the fiber's length wherein the fiber supports a single polarization mode within an operating wavelength band. The fiber may be coupled to optical components in systems to provide single polarization in the band. A method for manufacturing the fiber is also provided.
摘要:
In a vertical glass drawing process, an edge guiding assembly (33) located between a glass forming apparatus (41) and a glass sheet separating apparatus (20) reduces horizontal motion of the glass ribbon(13) from which the glass sheets (11) are removed and results in the reduction of the difference in stress levels between the top and bottom edges of a glass sheet (11) made by the process. The edge guiding assembly also provides a reduction of the variation of stress levels between successive sheets of glass made by the vertical drawing process.
摘要:
Microstructured optical fiber for single-moded transmission of optical signals, the optical fiber including a core region (170) and a cladding region (180), the cladding region including an annular hole-containing region (184) that contains ηon-periodically disposed holes. The optical fiber provides single mode transmission and low bend loss.
摘要:
A method of making a coaxial cable assembly is disclosed, the assembly comprising a coaxial cable and a connector, or connector termination, at least one end of the cable. A connector, comprised of connector components, is also disclosed. The method comprises placing connector components into contact with the cable before the connector components are assembled into a connector. The connector is assembled simultaneously with securing the connector to the cable to make a coaxial cable assembly. A method of preparing coaxial cable in a manner suitable for making coaxial cable assemblies is also disclosed. The coaxial cable assembly can be a jumper, or a lead.
摘要:
A device is provided which can act as one component of an anastomosis-forming assembly, i.e. as an anastomosis button. The device comprises a plurality of elongate members having a first, introduction configuration in which they are substantially aligned with one another, and a second, use configuration in which they are disposed at an angle to one another. For example, there may be two such elongate members, which, in the use configuration, form a cross. The device comprises means, for example, a tensionable thread, for bringing the elongate members into the use configuration.