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238 results about "Curved Tube" patented technology

The curved portion of the nephron.

Stent for irrigation and delivery of medication

A stent comprises a flexible tube having a proximal end, a distal end, and a passageway extending from said proximal end toward said distal end. A first generally straight tube segment extends from the proximal end while a first generally curved segment extends from an end region of the first generally straight tube segment disposed away from the proximal end of the stent. A second generally straight tube segment extends from an end region of the first curved segment away from the first generally straight tube segment and is arranged at an acute angle relative to the first generally straight tube segment. A second generally curved tube segment extends from one end of the second generally straight tube segment and includes a channel on an exterior surface of the second generally curved tube segment. The first generally curved tube segment and the second generally straight tube segment further include at least one cavity irrigation hole extending from the tube passageway, for providing irrigation fluids into the cavity into which the stent is inserted. At least one segments includes a channel on an exterior surface. The channel is sized to serve as a reservoir to contain a predetermined amount of at least one form of medication for delivery, over a period of time, of the medication to a cavity region proximate which the stent has been inserted.
Owner:INTERSECT ENT INC

Stent for irrigation and delivery of medication

A stent comprises a flexible tube having a proximal end, a distal end, and a passageway extending from said proximal end toward said distal end. A first generally straight tube segment extends from the proximal end while a first generally curved segment extends from an end region of the first generally straight tube segment disposed away from the proximal end of the stent. A second generally straight tube segment extends from an end region of the first curved segment away from the first generally straight tube segment and is arranged at an acute angle relative to the first generally straight tube segment. A second generally curved tube segment extends from one end of the second generally straight tube segment and includes a channel on an exterior surface of the second generally curved tube segment. The first generally curved tube segment and the second generally straight tube segment further include at least one cavity irrigation hole extending from the tube passageway, for providing irrigation fluids into the cavity into which the stent is inserted. At least one segments includes a channel on an exterior surface. The channel is sized to serve as a reservoir to contain a predetermined amount of at least one form of medication for delivery, over a period of time, of the medication to a cavity region proximate which the stent has been inserted.
Owner:INTERSECT ENT INC

90-degree bent pipe guide piece arrangement method

The invention discloses a 90-degree bent pipe guide piece arrangement method. The 90-degree bent pipe guide piece arrangement method comprises a 90-degree bent pipe, a guide piece A and a guide piece B. Two guide pieces are arranged in the 90-degree bent pipe, and are respectively the guide piece A and the guide piece B; the guide piece A is near the inner side of the bent pipe; and the guide piece B is near the outer side of the bent pipe. The guide pieces are arranged according to a golden ratio, that is, the guide piece B is arranged in the inner diameter place of the bent pipe from the inner wall of the outer side of the bent pipe by 0.618 time, and the guide piece A is arranged on the guide piece B from the inner wall of the inner side of the bent pipe by 0.618 time in the longitudinal section of the bent pipe. In the fluid flowing direction, after the guide piece B passes through the bent pipe, one part of extension section is generated; and the distance of the extension section is 0.3 time of the inner diameter of the bent pipe. The guide pieces in the bent pipe are reasonably arranged to reduce or eliminate complex flowing conditions in an elbow, so that the flowing field distribution is effectively improved, the pipe noise caused by unstable flowing is reduced, the reliability of the bent pipe is improved, and the service life is prolonged.
Owner:HARBIN UNIV OF SCI & TECH

Unsupported alternating curved tube dry type evaporator

The invention discloses an unsupported alternating curved tube dry type evaporator, which comprises a refrigerant inlet, a refrigerant outlet, a chilled water inlet, a chilled water outlet, a first end socket, a second end socket, a first tube sheet, a second tube sheet, a shell, a clapboard, heat exchange tubes and a bundling steel belt, wherein the heat exchange tubes are alternating curved tubes, and a ratio of the twist range and the equivalent diameter of each heat exchange tube is 6-12; the ratio of the short shaft and the long shaft of the cross section of the heat exchange tube 9 is 0.5-0.7; and the alternating curved heat exchange tubes are sequentially contacted with each other to be arranged, and are supported by self to form tube bundles depending on each contact point of the alternating curved tubes. The invention strengthens the turbulence degree of fluid in the tubes so that the fluid in the tubes can be fully mixed and the boundary layer is reduced, and strengthens the heat transfer. A shell side is not provided with baffles and can realize self supporting depending on the mutual contact of the alternating curved tubes, the fluid flows among the tubes are uniform, flow dead zones are eliminated, fouling deposit of the shell side is reduced, the heat transfer efficiency is improved, the service life of equipment is prolonged, and production cost is lowered.
Owner:SOUTH CHINA UNIV OF TECH

Test tool for inner-high-pressure-shaped complicated automobile tube beams

The invention discloses a test tool for inner-high-pressure-shaped complicated automobile tube beams. The test tool is capable of detecting ordinary regular pipe fittings, breaking through limitation of conventional test tools by providing a plurality of 'earthworm surface' test tools which coincide with the pipe fittings in dimension, and detecting complicated automobile pipe fittings with shaped surfaces. Furthermore, the test tool can be popularized and applied to detection of any workpiece with a complicated shaped surface. In addition, the test tool disclosed by the invention is capable of detecting the trend, the length, the verticality and the location degree of the pipe fitting. The test tool has the characteristic that the vertical distance from any point to the pipe fitting is equal, so that a weld bead can also be detected; the welding quality is ensured; in addition, the resilience of an elbow pipe can also be detected; and the resilience value can be calculated as long as the difference value between a clearance and the vertical distance between the pipe fitting and the test tool is measured, and therefore, the test tool is suitable for being used as an evaluation tool for elbow pipe quality at a bending test stage.
Owner:NINGBO TRIZ AUTOMATIC EQUIP
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