Showing papers on "Tube (fluid conveyance) published in 2000"

Outside tube for endoscope

Abstract: PROBLEM TO BE SOLVED: To provide an outside tube for an endoscope that can expand the kinds of usable endo-therapy accessories, improve the safety of endoscope technique and expand applied cases. SOLUTION: A tube fixing ring 9 is provided for detachably engaging the tip part of a tube body 8 with the tip part of an insert part 3 of the endoscope 2. The engagement of the tube fixing ring 9 is released by the operation of a grip part 13 on the base end side of the tube body 8.

Endoscope has control section and shaft with frame, and pipe containing slits

Abstract: An endoscope with a control section and a shaft extending therefrom is specified, which is characterized by the following. The shaft has a frame with a one-piece tube (40) along the major part of the length of the shaft, the tube being made of a super elastic alloy and slots (46) into it at least over a portion (52, 54, 56, 59) and the super-elastic properties of the super-elastic alloy allow the tube to bend near the slots without significant permanent deformation and ensure that the shaft is provided with adequate kink resistance, flexibility and torque resistance to fit into a patient's body to be able to be introduced.

Intraluminal stent graft

Abstract: An intraluminal device such as a stent graft is formed of a conformable ePTFE tube and preferably a compressed self-expanding stent affixed to the tube. The conformable tube is made by a special process which insures that the tube is radially deformable up to a predetermined diameter without exceeding the plastic deformation limit of the tube. The stent has a relaxed diameter larger than the diameter of the expanded tube after insertion so that the tube is biased to a cylindrical shape. The process for making the tube involves progressively dilating a small diameter extruded tube until a desired diameter is achieved. The tube is then contracted on a small diameter mandrel by heating.

Effect of van der Waals forces on axial buckling of a double-walled carbon nanotube

Abstract: An elastic model is presented to study infinitesimal buckling of a double-walled carbon nanotube under axial compression. A simple formula is derived for the critical axial strain, which clearly indicates the role of the van der Waals forces between the inner and outer tubes characterized by two parameters. In particular, the analysis shows that inserting an inner tube into a single-walled nanotube does not increase the critical axial strain as compared to the single-walled nanotube under otherwise identical conditions, despite the fact that the total critical axial force of the double-walled nanotube could be increased due to an increase in the cross-sectional area.

Device for use in ophthalmologic procedures

Abstract: A cutting device for ophthalmologic surgery in the eye of a living being specifically for suctioning, cutting and removing portions of the vitreous humor of the eye and/or tissue particles, includes a housing and a probe disposed thereon for insertion into the vitreous humor with the probe including a guide tube with a suction opening at its distal end and an inner tube co-axially inserted therein which is slideably movable in axial direction relative to the suction opening, and a control member configured to translate a rotational movement of the drive into a linear movement of the inner tube to thereby move the inner tube in the guide tube in the direction of the longitudinal axis from the resting position to the closing position and back to the resting position while preventing a linear movement of the inner tube at rotating drive when the inner tube is in the resting position.

Device for conducting in vivo measurements of quantities in living organisms

Abstract: The invention relates to a device (10) for conducting in vivo measurements of quantities in living organisms. Said device comprises a catheter-like tube (11) which accommodates, in a removable manner, a needle (14) that is provided for inserting the tube into the organism. The device also comprises at least one opening (12) in the wall of the tube (11) and is equipped with a sensor (18) for detecting the quantity to be measured inside the tube. The sensor (18) is mounted on a separate elongated support (17) whose cross-section is smaller than that of the inside of the tube. The support can be inserted into the tube (11) after pulling the needle (14) out of the tube (11).

Sapphire reinforced thermocouple protection tube

Abstract: An improved apparatus including a thermocouple for measuring the temperature in a gasification process is provided The improvement includes a sapphire reinforced outer protection tube for enclosing at least a portion of the thermocouple The sapphire reinforced outer protection tube may be integrally formed around an inner protection tube, the inner protection tube being receptive of a sapphire-sheathed thermocouple The apparatus may be inserted directly into a gasification stream without the use of a thermowell The sapphire reinforced outer protection tube increases the life of the thermocouples used in gasification processes

Wearable effect-emitting strain gauge device

Abstract: A position/movement sensitive effect-emitting strain gauge device includes a responsive portion, such as an electrically conductive fabric, that can be stretched or relaxed and that changes an electrical property, such as resistance, when stretched or relaxed. The changeable electrical property of the responsive portion is detected by a regulating circuit, which sends a signal that depends on the detected electrical property to an effect-emitting component. The effect may be sound or light emission or the like. The shape of the responsive portion can be such as to allow it to fit over a body part, e.g., a tube shape would allow it to fit over an elbow. When worn, the electrical property of the responsive portion, and therefore the emitted effect, depends on the user's positions/movements.

Vacuum-assisted remote suture placement system

Abstract: A method and device for suturing tissue, in which the device includes a tube of a size to be inserted into a surgical site, such as into an artery or heart valve annulus of a patient. The tube includes a suction opening laterally circumscribing at least a portion of the tube to allow fluid communication between the tissue of the patient at the surgical site and the bore of the tube. Also within the tube is a carriage for detachably holding at least one needle, in which the carriage is slidably movable within the bore near the suction opening of the tube. When the tube is properly positioned, a vacuum source is placed in fluid communication with the bore of the tube so that the tissue is drawn into the suction opening of the tube. The carriage is then slid within the bore so that the needles detachably held thereby traverse the tissue, thus quickly and efficiently placing sutures in the tissue at the surgical site.

Implantable shunt device

Abstract: A bioinert implantable shunt device useful for controlling internal pressure includes a valve apparatus, a device for attaching the valve apparatus and an inlet tube. The valve apparatus includes an inlet port, an outlet port, a flexible tube connected therebetween and a pressurized enclosure. The flexible tube is positioned inside the pressurized enclosure whereby fluid flow from the inlet port to the outlet port is dependent on a differential pressure between a pressure in the flexible tube and a pressure outside the flexible tube in the pressurized enclosure. The inlet tube is connected to the inlet port of the valve apparatus. The pressurized enclosure may include a housing and a semi-permeable membrane in a wall of the housing whereby fluid can pass through the semi-permeable membrane into the pressurized enclosure thereby increasing the pressure in the pressurized enclosure. The implantable shunt device may be for use in the treatment of glaucoma. Further, there is provided a method of reducing intraocular pressure including the, steps of attaching a biocompatible implantable shunt device to the scleral surface of an eye and inserting an inlet tube into the anterior chamber of the eye.

Flexible tube for endoscope

Abstract: A flexible tube for an endoscope is provided with an outer tube member. A synthetic resin layer is formed on an outer circumferential surface of the outer tube member. A coating layer is further formed on the outer circumferential surface of the synthetic resin layer. The outer circumferential surface of the synthetic resin layer is provided with at least one groove or protrusion.

Iol insertion apparatus and method for making and using same

Abstract: Apparatus for inserting intraocular lenses (IOLs) into eyes include a hollow tube including a material and having an interior wall defining a hollow space through which an IOL is passed and an outlet through which the IOL is passed from the hollow space into an eye, and a lubricity enhancing component physically secured to said hollow tube and concentrated at or near the interior wall in an amount effective to facilitate the passage of the IOL through the hollow space.

Pulse tube refrigerator

Abstract: A pulse tube refrigerator includes a compressor, a first high pressure valve connected with the compressor, a first high pressure passage connecting the outlet port of the compressor with the first high pressure valve, a first low pressure valve connected with the compressor, first low pressure passage connecting the inlet port of the compressor with the first low pressure valve, a regenerator connected with the first high pressure valve and the first low pressure valve, a cold head connected with the regenerator, a pulse tube connected with the cold head a second high pressure valve connected with the pulse tube. The pulse tube refrigerator further includes a second low pressure valve connected with the pulse tube, a high pressure cylinder provided in the second high pressure passage, a high pressure side partition element reciprocally provided within the high pressure cylinder and fluid tightly dividing the high pressure side cylinder into a first high pressure space and a second high pressure space, a low pressure cylinder provided in the second low pressure passage; and a low pressure side partition element reciprocally provided within the low pressure side cylinder and fluid tightly dividing the low pressure cylinder into a first low pressure space and a second low pressure space.

Energy absorption of foam-filled circular tubes with braided composite walls

Abstract: Braided glass-fibre/epoxy circular tubes with polymer foam cores are loaded in tension and in compression, and the energy of deformation is measured. Theoretical models of tube deformation are developed, and are used to predict the energy absorption as a function of tube wall strength, the ratio of tube wall thickness to tube diameter, and the density of the foam. The energy per unit mass and energy per unit volume are optimised with respect to the relative density and geometry. It is found that foam-filled braided circular tubes exhibit promising energy absorbing characteristics, due to a combination of energy absorption by the polymeric foam core and by the glass/epoxy braided tube.

A liquid heating module, a system comprising said module and a process for heating liquid

Abstract: The present invention concerns a liquid heating module for use in a hot beverage machine, which comprises a hollow tube (2) of metallic material, a cylindrical insert (3), which is disposed inside the hollow tube, along its entire length and substantially along its axis of symmetry, at least one electrical resistor (4) on a first part of the outside of the tube for preheating liquid flowing through said hollow tube and at least one other electrical resistor (5) on a second part of the outside of the tube for temperature adjustment of the liquid flowing through the tube.

Method and apparatus for percutaneously accessing a pressure activated implanted port

Abstract: This invention is methods, and apparatus for percutaneously accessing an implanted port (10), and use an access tube (N) which is periodically introduced to the implanted port. The apparatus is preferably an implanted port having a pressure-responsive valve element (40). It has been found that repeated passage of the access tube through the same tissue tract to the implanted port reduces patient trauma, with minimized bleeding, and reduction in sensitivity. The tract may be initially formed by percutaneously placing a penetrating element through intact skin to the port, and leaving the element in place for a time sufficient to create the tract.

Method of coating polymeric tubes used in medical devices

Abstract: The present invention relates to a method of preparing a coated hollow polymeric tubular member useful in medical devices The method involves a simple, unique method of simultaneously extruding and coating the polymeric tube

Condensation heat transfer and flow pattern inside a herringbone-type micro-fin tube

Abstract: Condensation heat transfer and pressure drop of R410A and R22 in a newly proposed herringbone-type micro-fin tube are measured and compared to those of a helical micro-fin tube and a smooth tube. The heat transfer coefficient of the herringbone micro-fin tube is higher than that of the helical micro-fin tube in the high mass velocity region, while it has slightly lower value in the low mass velocity region. Pressure drop of the herringbone micro-fin tube is, however, higher than that of the helical micro-fin tube. Flow patterns of the herringbone micro-fin tube are observed and the heat transfer enhancement mechanism is discussed. The heat transfer coefficient and pressure drop of the helical micro-fin tube is predicted well with previously proposed correlations, while those of the herringbone-type micro-fin tube has higher value than the predicted values. Preliminary correlations for the pressure drop and the heat transfer coefficient are proposed for the herringbone micro-fin tube.

Catheter with multiple heating/cooling fibers employing fiber spreading features

Abstract: A catheter using multiple hollow fibers to carry a heating/cooling fluid employs fiber spreading features to improve heat transfer and help prevent clotting of body fluids within which the catheter is immersed. The catheter includes a length of outer tube surrounding an inner tube. The inner tube conveys fluids in one direction, and the passageway between inner and outer tubes conveys fluids in the opposite direction. The inner and outer tubes have proximal distal ends. The distal end is closed, but the proximal end is open to permit introduction of a heating or cooling fluid into the inner tube, and withdrawal of the fluid from the passageway between the inner and outer tubes. At the tubes' distal end resides a proximal fluid transfer housing coupled to multiple hollow heat exchange fibers. The distal ends of these fibers may be commonly connected to a distal fluid transfer housing and optional reservoir, which cooperatively return fluid to the passageway between inner and outer tubes. In another embodiment, each fiber includes both outflowing and return lumens, enabling the fibers' distal ends to freely move about. In another embodiment, each fiber proceeds outward from the proximal fluid transfer housing, and returns back to form a loop. In each different embodiment, the invention includes one or more actuating structures to spread the fibers. The actuating structure may include, for example, fiber shaping, a retractable spreading member, elastic bias built into the fibers, etc.

Ink-jet recording apparatus

Abstract: PROBLEM TO BE SOLVED: To stabilize a pump efficiency and extend a life of a tube by setting to the tube pump a tube guide for regulating a position of the tube in the tube pump. SOLUTION: A rotary supporting member 35 is axially supported by a pump shaft 42 to be rotatable, with having a gear in the outer circumference for receiving a rotary driving force. Moreover, a tube guide 44 is set at a position of the rotary supporting member 35 corresponding to a tube 15 to regulate a movement of the tube 15 in a direction of the pump shaft 42. The tube guide 44 is formed of a ring member having guide parts of a U section at a plurality of points on the circumference and at the entire circumference. The guide parts are opened outward in a radial direction. A pump efficiency is stabilized at an ink supply from an ink tank to a sub tank or at an ink circulation from the sub tank to a recording head, etc.

Coriolis mass flow controller

Abstract: A capacitive pick off sensor for a mass flow measurement device is disclosed. The mass flow measurement device includes a flow sensor tube and a drive device for vibrating the flow sensor tube. The capacitive pick off sensor includes at least one conductive plate connectable to a first voltage potential and adapted to be situated adjacent the flow sensor tube which is connected to a second voltage potential. The conductive plate is positioned relative to the flow sensor tube so as to define a gap therebetween. The capacitance between the conductive plate and the flow sensor tube varies due to the relative motion of the conductive plate and the flow sensor tube when the flow sensor tube is vibrated. In other aspects of the present invention, the flow sensor tube is situated in a housing and the drive device is positioned outside the housing for vibrating the flow sensor tube.

Porous ceramic liner for a plasma source

Abstract: A plasma tube comprising a vacuum sealing ceramic outer tube, a porous ceramic insert disposed on the inside wall of the outer tube, and a source of high frequency radiation, for example, an RF coil wrapped around the tube, to excite gas flowing through the bore of the insert into a plasma. The invention is particularly useful as an exhaust scrubber for oxidizing exhaust gases from a semiconductor processing chamber. A catalyst may be embedded in the porous insert to promote the scrubbing reaction. The invention may also be used in an applicator of a remote plasma source.

Flat tube pressure sensor

Abstract: A pressure sensor (18) includes a tube (30) for channeling a fluid (16) therethrough. A seat (32) is disposed in an outer surface (36) of the tube, with a flexible diaphragm (34) at the bottom thereof. The diaphragm is planar, and blends at its perimeter coextensively with an arcuate inner surface (38) of the tube. A gauge (42) is mounted in the seat above the diaphragm for measuring flexure thereof under pressure of the fluid inside the tube.

Pumping chamber for a liquefracture handpiece

Abstract: A surgical handpiece having at least two lumens or tubes mounted to a body. At least one tube is used for aspiration and at least one other tube is used to inject heated surgical fluid for liquefying a cataractous lens. A portion of the second tube is enlarged to form a pumping chamber. The pumping chamber works by boiling a small volume of the surgical fluid. As the fluid boils, it expands rapidly, thereby propelling the liquid downstream of the pumping chamber out of the second tube. The pumping chamber may use a pair of electrodes.

System and method for placement of a surgical instrument in a body cavity

Abstract: A cryoprobe sheath has at least one positioning element that deploys and retracts to permit the insertion of the cryoprobe into a uterus without using ultrasound or fluoroscopy. Deployment of the positioning element(s) positions the cryoprobe within the uterus permitting even cooling to facilitate cryoablation. The positioning element(s) and sheath may be withdrawn either after tacking the cryoprobe in position by a momentary activation or after a complete activation cycle, with each positioning element pulling through frozen medium in its own track. A guide and filler tube may be employed to infuse the correct quantity of thermally conductive medium into the uterus for cryoablation. The guide and filler tube allows fluid volume and pressure to be measured to avoid inadvertently breaching the uterine wall.

Stopper-shield assembly

Abstract: The present invention is a stopper and shield closure assembly 16 millimeter (mm) fluid collection tube whereby the 16 millimeter tube is compatible with conventional needle holders.

Syringes, syringe tubing and fluid transfer systems

Abstract: A syringe includes a body and a plunger disposed therein. The body includes a nozzle formed therein and at least one hub member connected thereto or integrally formed thereon for holding an end of a connector tube. The connector tube includes two ends, each end preferably being connected to a respective hub member to retain the connector tube in contact with the syringe. Preferably, the syringe and the connector tube are packaged in a pre-connected condition for ease of use by the customer. Furthermore, flexible inlet tubing for connection to a syringe for filling the syringe with contrast media, for example, is described. The inlet tubing permits filling of the syringe from either a bag or a bottle and may remain attached to the syringe so that it forms at least a part of the connection to the patient. In addition, an apparatus for facilitating the purge of air from a connector tube that will ultimately be connected between a syringe and a patient is described. The apparatus includes a purging tube connected to the distal end of the connector tubing from the syringe. The purging tube includes a venting cap at its distal end. A flow inhibitor is positioned under the venting cap to cooperate with the venting cap by discouraging the discharge of fluid from the distal end of the purging tube while permitting the discharge of air therefrom.

Water-tube boiler

Abstract: The invention provides a water-tube boiler which allows further NOx reduction and CO reduction to be implemented with a simple construction of the boiler body itself, and which is improved in boiler efficiency. The water-tube boiler includes a first water tube array made up of a plurality of first water tubes arranged into an annular shape, a combustion chamber defined inside the first water tube array, a first opening defined at part of the first water tube array, a cooling water tube array made up of a plurality of cooling water tubes arranged into an annular shape in a zone within the combustion chamber where burning-reaction ongoing gas is present, gaps provided between adjacent cooling water tubes so as to permit the burning-reaction ongoing gas to flow through, a burning-reaction continuing zone, where burning reaction is continuously effected, provided between the cooling water tube array and the first water tube array, a second water tube array made up of a plurality of second water tubes arranged into an annular shape outside the first water tube array, and a gas flow passage provided between the first water tube array and the second water tube array, wherein in the gas flow passage, heat transfer area per unit space is larger on the downstream side than on the upstream side.