Showing papers on "Tube (fluid conveyance) published in 1989"

Electro-opto-mechanical cable for fiber optic transmission systems

Abstract: An electro-opto-mechanical cable includes at least one thin-­wall steel alloy tube (20) containing at least one single mode fiber (15) and a void filling gel (16) to assure the capability for transmitting low-noise optical phase data. A dielectric annulus (25) and an elec­trically conductive layer (50) disposed therein helps further assure watertight integrity and power or electrical signal transfer. An optional double-layer contrahelical or three or four layer, torque balanced, steel wire strength member (68, 78) provides additional protection as well as capability to be towed, deployed and recovered from the seafloor at abysmal depths. The steel armor and cable core interface eliminates all intersticial spaces associated with the armor wires to produce a firm, hard cable that experiences minimal residual strain (creep) due to extensive load cycling. A pressure extruded outer jacket aids in assuring the protection of the individual steel wires from point loadings and from strength degradation due to corrosion. Further, the integral steel armor and jacketing structure provides protection for the electro-optic core from abrasion against rock or coral at cable suspension points during sustained cable strumming.

Temperature sensing device

Abstract: A temperature sensing element (thermocouple, thermistor, or resistance temperature detector) for high temperature application is housed inside a metal tube, with lead wires to the temperature sensing element insulated from each other and the tube by a compactable mineral insulation material such as magnesium oxide. Initially the insulation material is in the form of a molded cylindrical preform with two lengthwise passages through which the lead wires are inserted. After the wires are inserted through the preform, the tube is placed around the preform and compressed to reduce its diameter. This crushes and tightly packs the insulation material around the lead wires. A strain relief and moisture seal may be provided at the end of the tube away from the temperature sensing element.

Coaxial cable connector

Abstract: A coaxial cable connector including a screw threaded tube, a male clamping tube and a female clamping tube The male clamping tube has a central hole, a rear projection pipe and a clamping portion, whereby an insulating portion of a concentric coaxial cable fits into the projection pipe with an outer cover and separate grounding wire sheath of the concentric coaxial cable fitted between the projecting pipe and clamping portion The inner wall of the female clamping tube is formed with rearwardly tapering inclined portion whereby when the female clamping tube is fitted to the male clamp portion, the tapering portion presses the clamping section of the male clamping tube making the saw tooth portion of the inner wall of the clamping portion securely bite into the concentric coaxial cable An annular projecting shoulder formed on an outer wall of the clamping portion of the male clamping tube engages an annular groove formed on inner wall of the female clamping tube to join the male and female clamping tubes The joined clamping tubes are fitted into the screw threaded tube having threads on an inner wall formed to thread on a coaxial cable socket with an axial connecting wire of the coaxial cable passing through the male clamping tube into an output hole of the coaxial cable socket

Endoscope for use with a disposable sheath

Abstract: An endoscope specially adapted for use with a disposable sheath having an outer casing and one or more internal channels. The endoscope includes a tip portion connected to a control handle through a flexible insertion tube. The insertion tube is formed by a braided wire tube covered by a flexible waterproof coating and surrounding a resilient D-shaped tube through which optical components for the endoscope extend. A longitudinally extending groove is formed in the braided tube to receive the channel(s). The groove extends perpendicular to, and makes contact with, a generally planar portion of the D-shaped tube so that the D-shaped tube can restrict deformation of the groove as the insertion tube bends. Longitudinal channels are formed on opposite sides of the groove to house control cables extending from the control handle to the tip portion. The cables are surrounded by tubes that collectively occupy the entire channel so that the tubes prevent the channel, and hence the groove, from collapsing.

Thermocouple temperature sensor and a method of measuring the temperature of molten iron

Abstract: A thermocouple temperature sensor employs a protecting tube made of metal-boride-based ceramics, and a platinum -rhodium-based thermocouple. To prevent a deterioration of the thermocouple due to a reducing gas generated in the protecting when used at a high service temperature, the thermocouple is placed in an insulation tube, which is placed inside the protecting tube. In addition, a front end portion of the insulation tube is covered with a noble-metal cap mainly composed of platinum group metal, to prevent the reducing gas generated in the protecting tube from reaching a connection point of the thermocouple. The top end of the protecting tube is open, and a terminal box with a ventilation means to smoothly discharge the reducing gas in provided. This arrangement remarkably prolongs the service life of the thermocouple, and thus it is able to continuously measure the temperature of molten pig iron and molten steel for a long interval.

Flow in packed tubes with a small tube to particle diameter ratio

Abstract: La simulation porte sur un ecoulement monophasique dans un petit tube garni de particules spheriques de taille quasi uniforme. On distingue dans ce milieu poreux simule des unites structurales pentaedriques pres des parois et tetraedriques au centre du tube

Optical flex sensor

Abstract: An optical flex sensor is provided and consists of a flexible tube having two ends, a reflective interior wall within the flexible tube and a light source placed within one end of the flexible tube and a photosensitive detector placed within the other end of the flexible tube to detect a combination of direct light rays and reflected rays when the flexible tube is bent.

Vascular graft prosthesis and method of making the same

Abstract: A prosthesis for replacing parts of arteries and other blood vessels preferably has an inner tube suitable for use as a vascular graft in combination with external longitudinal ribs and a surrounding wrap which provides radial and longitudinal strength and resistance to kinking. The ribs separate the wrap from the inner tube, providing spaces between the wrap and tube to allow the tube to expand and contact, thus promoting isocompliance of the prosthesis with natural blood vessels.

Catheter having durable and flexible segments

Abstract: An epidural catheter is disclosed having a durable and a flexible segment joined together. The flexible segment is inserted into a patient with the use of a well-known needle which is removed by passing the needle over the outside of the catheter. The flexible segment is atraumatic to the surrounding tissue. The flexible segment includes a plastic tube surrounded by a wire coil for pushing the tube into a passageway of the tissue. The distal end of the plastic tube and wire coil are joined to prevent unwinding of the coil when extracted. The tightly coupled wire coil also permits the flexible portion to be easily inserted into the passageway of the tissue. The durable segment joined to the flexible segment includes a stainless steel tube with a flat wire coil surrounding a length of the tube. The stainless steel tube permits fluid at an elevated pressure to pass through the hollow passageway therein without rupturing. The flat wire coil prevents kinking of the semi-rigid stainless steel tube. When a fluid at an elevated pressure is received, the distal end of the flexible tube is closed to diffuse the fluid passing through the length of the catheter. Slits are provided laterally on the side of the plastic tube for emitting and diffusing the fluid through the wire coil.

Electro-surgical apparatus for removing tumours from hollow organs of the body

Abstract: Disclosed is an endoscope for use in the removal of tumours from hollow body organs such as the bladder. The endoscope consists of sheath (49) through which extends a telescope (46) and a suction diathermy tube (31) the non-operation end (33) of which communicates with a suction device. Provision (51, 52) is made for an irrigation fluid to be passed through the endoscope. The diathermy tube (31) may be a flexible plastics tube (2, 61) and the diathermy electrode tip (7, 8) may be formed from electrically conducting resistance wire connected (5, 39, 63) to a diathermy machine. The electrode tip is found adjacent an aperture (41) at the operative of the tube whereby tissue can be immediately removed by suction after severance by the electrode tip. The degree of suction applied to tube (31) being controlled by a finger hole (38a) located at or near the end (33) of the tube (31). Alternatively the tube (31) may be formed of a metal tube (34) coated with an insulating plastics material (35) and having a cutting or coagulating tip (34a), provision (37, 38, 43, 45, 53, 54) being made for reciprocating the tube up and down the endoscope.

Refrigerant-transporting hose

Abstract: A refregerant transporting hose having an inner tube; an outer tube of a rubber material located radially outwardly of the inner tube; and a reinforcing fiber layer interposed between the inner and outer tubes, such that the reinforcing fiber layer and the inner and outer tubes constitute an integral tubular body, the inner tube including a resinous layer formed of a blend of modified polyolefine and polymaide resin. Alternatively, the inner tube includes a resinous layer formed of a reaction product of polyamide, and polyolefine whose molecular chain has a pair of functional groups at both ends thereof. The hose has a high flexibility as well as a high resistance to gas permeation therethrough.

Method for placing a body of shape memory metal within a tube

Abstract: A body of shape memory metal is placed within a tubing by a running sub which transports the body to a desired location within the tubing while the shape memory metal is in its martensitic phase whereupon the shape memory metal is heated so as to regain its original shape which is tailored to its application inside the tubing.

Endotracheal tube with inflatable cuffs

Abstract: An endotracheal tube for artificial ventilation employs a primary cuff and a secondary cuff for locating and positioning the tube in the trachea of a patient. The secondary cuff employs a balloon sleeve which is located in close proximity to the distal end of the tube. The secondary balloon sleeve is sealed against the tube in a reverse folded configuration. The tube wall includes a number of lumens which may be employed for various auxiliary functions.

Urinary control valve and method of using same

Abstract: A silicone valve is placed in the orifice of the urethra. The valve tube includes a pair of blade valve elements which extend from the valve side wall forwardly and inwardly. The tube includes a bulb portion in the area of the valve elements to provide pressure cavities for urine to accumulate and apply pressure to the blade elements to maintain them normally closed. Pressure on the opposite sides of the tube walls will open the valve to flow of urine therethrough.

Vibration of Tube Bundles in Two-Phase Cross-Flow: Part 1—Hydrodynamic Mass and Damping

Abstract: Etude experimentale des mecanismes de vibration et d'amortissement d'un faisceau de tubes d'un echangeur soumis a un ecoulement croise diphasique: installation experimentale, conditions operatoires. Determination des parametres d'influence: densite du melange eau/air, fraction vide, etc…

Isotonic tube feeding formula induces liquid stool in normal subjects

Abstract: Diarrhea is one of the most common complications in patients who receive tube-feeding formulas. Since the colon is the final site of water and electrolyte absorption and ultimately determines fecal composition, diarrhea during tube feeding may result from altered colonic function. The lack of dietary fiber, such as pectin, in tube-feeding formulas may be one of the means by which colonic function is affected. The purpose of this study was to determine the effect of a standard, liquid, commercially available, isotonic tube-feeding formula (ITFF) and the effects of supplementing the ITFF with pectin on colonic function as measured by stool consistency and colonic fluid composition in 13 normal adults. Data were obtained when subjects consumed their regular diet, ITFF, and ITFF supplemented with pectin using the technique of in vivo dialysis of colonic fluid. Ingestion of the ITFF resulted in a significant increase in the percentage of liquid stools compared to a regular diet [median (interquartile range) = 0% (0), 60% (64); p less than 0.01]. Ingestion of the ITFF also resulted in significant decreases in the concentrations of sodium, potassium, and short-chain fatty acids, and increases in pH and osmotic gap in colonic fluid compared to the subjects' regular diet. Supplementing the ITFF with pectin significantly reduced the incidence of liquid stools [0% (0)] and promoted a normalization of colonic fluid composition. The results suggest that the addition of pectin may enhance tolerance to ITFFs.

Body cooling apparatus

Abstract: Body cooling apparatus for removing body or external heat in an environment where sufficient cooling by perspiration is not available. The apparatus includes a compressor and a condenser which feeds liquid coolant to a flexible tube network which is held adjacent the body to be cooled. The cooling takes place by the boiling of the liquid within the flexible tube network. The flow of liquid into the network is controlled depending upon the amount of cooling needed.

Process and apparatus for separating fine particles by microbubble flotation together with a process and apparatus for generation of microbubbles

Abstract: A method and apparatus are disclosed for the microbubble flotation separation of very fine particles, especially coal, so as to produce a high purity and large recovery efficiently. This is accomplished through the use of a high aspect ratio flotation column, microbubbles, and a countercurrent use of wash water to gently wash the froth. Also, disclosed are unique processes and apparatus for generating microbubbles for flotation in a high efficient and inexpensive manner using either a porous tube or an in-line static generator.

Method of repairing heat exchanger tube ends

Abstract: Heat exchanger tubing has failure rates due to inlet end related problems in the 85-90% range. Such failures are normally limited to the first three to six inches of the tube inlet ends. The present method eliminates the problem without relining, removing, or sealing the tubes. The tube ends are first inspected and the condition of the inlet areas of the tubing determined. If the ends are eroded or corroded, the tube ends are cleaned down to the metal. Then a metallurgically compatible insert is installed in the damaged end and controllably roller-expanded to eliminate any end step at the downstream end as well as to prevent over expansion of the damaged tube and insert. The input end of the insert is flared to the existing inlet tube profile, thereby restoring the damaged area. This process eliminates totally replacing or relining the existing tubes. If erosion is severe, a bushing is inserted between the insert and the tube end and they are roller-expanded together. The tube may also be bored out to restore tube concentricity before the insert is installed. In another embodiment the damaged tube end is severed and replaced with a collar before the insert is installed and then roller-expanded to restore the damaged end.

Reel for borescope insertion tube

Abstract: A storage and dispensing reel for borescope insertion tubes which has a reel compartment for the coiled tube and an inner foam filled storage compartment for the proximal end of the tube and the associated control modules therefore. The entire reel is arranged for rotation about its axis and has a cover to secure and protect the apparatus stored therein.

Membrane Reactor Using Microporous Glass-supported Thin Film of Palladium. Application to the Water Gas Shift Reaction

Abstract: A composite membrane consisting of palladium thin film and a microporous-glass tube was applied to a membrane reactor. In the water gas shift reaction, the membrane reactor gave the conversion level exceeding the equilibrium one for the closed system as a result of the separation of hydrogen produced.

Endotracheal tube holder

Abstract: An endotracheal tube holder is provided which has the capability to hold both an endotracheal tube and a feeding tube in a side by side relationship. Two separate passageways are provided to hold each tube. A surrounding collet provides compression force to hold the endotracheal tube in position relative to the holder. The holder is provided with attachments for a headband that is affixed to flexible wings on either side of the holder. A model for premature or newborn infants is provided with a removable soft sleeve that fits over the mouth portion of the holder so that the gums are not inflamed by friction with the hard surface of the holder which serves as a bite block.

Suction attachment for electrosurgical instruments or the like

Abstract: A clip-on attachment for a surgical instrument of the type having a handle which supports an electrode and switches for selectively applying high frequency electrical energy to the electrode acts to withdraw smoke, fumes or other fluids that may be produced in the region of of the electrode by contact with living tissue. The attachment includes an elongate tube which extends along the instrument handle and which preferably has a helically curved forward end that makes a partial turn around the forward end of the handle. A length of flexible tubing connecting with a source of low pressure is threaded through the tube to extend from the front end of the tube towards the electrode. Resilient clamps on the tube clasp the instrument handle while enabling axial sliding movement and partial rotation of the attachment around the instrument handle to enable repositioning of the flow intake under different operating conditions.

Slit valve medical catheter

Abstract: A slit valve medical catheter includes a flexible tube the distal end of which is closed. A length of resilient tubing is mounted coaxially to the distal end segment of the tube so that the tubing extends along the inside or outside surface of the tube. The tubing is slitted lengthwise and an aperture is formed in the tube wall directly opposite each slit with the aperture being wider than the slit so that portions of the tubing wall on opposite sides of each slit overhang the sides of the corresponding aperture.

Method and apparatus for removing an implanted pacemaker lead

Abstract: Heart lead removal apparatus and method are disclosed for removing a pacemaker lead from a heart through a blood vessel leading thereto. The apparatus comprises a flexible stylet wire with an expandable wire coil attached to the distal end for engaging the coiled structure of the pacemaker lead. A lockable mechanism grasps the proximal end of the lead, and a wire guide is inserted in the passageway of the lead to determine its size and clear any blockage therein. The stylet wire is inserted in the longitudinal passageway of the coiled structure to the distal end of the pacemaker lead. The stylet wire is rotated in a direction to unwind and expand the wire coil and engage the coiled structure, thereby securing the stylet wire to the pacemaker lead. A tie secures the insulating material to the coiled structure of the lead at the proximal end thereof to limit motion and to apply a uniform extraction force to the entire lead. A separator tube is inserted over the proximal end of the stylet wire and the lead and moved along the entire length of the lead to first separate the restricted lead from the blood vessel and then the heart cavity. The separator tube, stylet wire, and pacemaker lead are then removed from the heart cavity and blood vessel without causing any significant injury to the heart cavity wall.

Control of water and nutrients using a porous tube: a method for growing plants in space.

Abstract: A plant nutrient delivery system that uses a microporous, hydrophilic tube was developed with potential application for crop production in the microgravity of space. The tube contains a nutrient solution and delivers it to the roots. Pumps attached to the tubing create a very small suction that holds the solution within the tube. This system was used to grow wheat for 107 d in a controlled environment at suctions of 0.40, 1.48, or 2.58 kPa. The water absorbed through the pores of the tube by baby diaper sections decreased as suction increased. Correspondingly, final plant biomass, seed number, and spikelet number also tended to decrease as suction increased. The reduced yield at higher suction suggests that the plants experienced water stress, although all suctions were below those typical of soils at field capacity.

Pumping device having inlet and outlet valves adjacent opposed sides of a tube deforming device

Abstract: A pumping device controlling an amount of liquid passing through a length of tubing accommodated in the pumping device. The pumping device includes inlet and outlet valves located adjacent opposed sides of a tube deforming device. The valves are controllable for restricting the flow of liquid through the tubing, and the deforming device is such that the tubing is first deformed in one direction and then in another direction which tends to restore the original cross-sectional shape of the tubing.

Double wall catheter with internal printing and embedded marker

Abstract: A catheter and a method of making the same, which catheter has a means for interferring with an electromagnetic field to allow accurate detection of the catheter through tissue, the catheter comprising a first tube extruded over a continuous, solid core material having a diameter equivalent to the desired diameter of the inner passageway of the catheter, bands of metal fused to the first tube at various locations, and a second tube which is extruded over the first and the metal bands. The double-walled continuous tube is then cut into individual tubes and the core material is removed to form the catheter of this invention, which has a smooth outer surface and an embedded metal band.

Continuous cyclic peritoneal dialysis system

Abstract: A continuous cycle peritoneal dialysis system and process is disclosed which includes a source (14) of sterilized dialysis fluid, and an inflow line (34) and outflow line (35) connected to a catheter (26) implanted in the peritoneal cavity (28) of a patient. A fill pump (B) pumps sterilized dialysis fluid from the source to the catheter through the inflow line during a fill cycle. A drain pump C pumps fluid from the catheter to a drain through the outflow line during a drain cycle. A function of a volume of the dialysis fluid in the peritoneal cavity is detected by a manometer (D). A process controller (A) controls the fill and drain pumps in response to signals from a high fluid level detector (50) and a low fluid level detector (52) on a fluid column tube (48) to pump a calibrated fill volume of fluid into the cavity and a calibrated drain volume of fluid out of the cavity continuously in alternating fill and drain cycles in a manner that the fluid flows through the cavity generally with zero dwell time. In the process, an inflow volume of dialysis fluid pumped into the cavity is metered (36b) and an outflow volume of fluid pumped out of the cavity is metered (44b) to determine the amount of fluid removed from the patient by comparing the inflow and outflow volumes. A glucose pump (E) is connected to a source (70) of glucose and to the inflow line for delivering a regulated amount of glucose in response to a comparison of the metered inflow and outflow volumes.

Bioabsorbable surgical device for treating nerve defects and method for manufacturing it

Abstract: A bioabsorbable tube device (10) for the repair of nerve defects or gaps comprising a flexible, porous, knitted or woven mesh tube. The tube device is crimped along its exterior (12) to provide a tube which can be bent without pinching or crimping the internal circumference of the tube. The internal tube surface (14) is relatively smooth to provide an optimum environment for longitudinal nerve axon growth within the tube. A method of using such a tube device is also disclosed utilizing the steps of selecting a flexible, porous, bioabsorbable tube device and, then, suturing the nerve ends within the tube device such that a predetermined gap is left between the proximal and distal nerve ends to allow for nerve axon growth across the nerve gap from the proximal nerve end to the distal nerve end.