Abstract: A full head respirator to filter the air of smoke and fumes, that includes an infrastructure capable of fitting over a human head and adaptable to all sizes and shapes of wearers. The infrastructure is formed by a plurality of intersecting air tubes. The respirator has a covering made of flexible flame-resistant material that is adapted to envelop the human head and neck, mounted on the infrastructure and secured thereto. The covering has a transparent eyepiece, and filter means. The respirator has a mechanism for generating a foam to fill the air tubes of the infrastructure, and thereby fit them about the head of a wearer, and fastening mechanisms to secure the respirator on the head of the wearer.

Abstract: A lung ventilator system has a demand valve to provide for spontaneous breathing with modification of the ventilator action to complement the spontaneous breathing and to synchronize restored forced ventilation with a last spontaneous breath. The system includes means to detect gas flow in the supply to the demand valve and to output a signal to the oscillator to modify or inhibit its operation in relation to the volume of gas drawn from the demand valve to vary the duration of the exhalation phase of the ventilation cycle. The system preferably uses a pneumatic oscillator with a feedback circuit connected to be influenced by the pressure drop across a restriction in the supply to the demand valve, signalled by the operation of selected ones of a plurality of inhibitor valves responding to different pressure drop levels.

Abstract: A lung-governed breathing valve used in a breathing mask for excess pressure operation. The valve has a casing with a spring-loaded control diaphragm which divides the casing into an outer chamber connected to the outside environment and a breathing chamber for conveying the gas for breathing. The control diaphragm controls a breathing gas inlet valve via a lever system and a manually released actuating button. The control diaphragm has a resilient raised portion formed integrally thereon with a recess therein. A push-rod integrally molded on the actuating button is positively engageable in the recess of the raised portion to prevent the lung-governed valve from being accidentally released or switched from the stand-by to the operative position.

Abstract: A disposable CO.sub.2 absorber for applications in rebreathing systems uses a flexible bag-like pouch to contain CO.sub.2 absorbent granules. The pouch includes an intake port having a one-way valve at the top of the pouch and an outlet or exhaust port including a perforated cylindrical tube or perforated disk in the bottom of the pouch. Exhaled gas containing CO.sub.2 passes through the one-way valve at the intake port and contacts the absorbent granules where a chemical reaction bonds the CO.sub.2 with the granules. The residual gas, substantially free of CO.sub.2, passes out of the pouch through the exhaust ports for rebreathing by the user. The flexure of the pouch increases the efficiency with which the CO.sub.2 is absorbed.

Abstract: A hot or cold body pack utilizing a heat transferring element which includes a bag having a first heat insulative portion and a second heat porous portion. The heat porous portion also mechanically retains a heat transfer element within the bag. The bag includes an opening to retain the heat transfer element. First and second loop members extend along separate dimensions on the outer surface of the bag to permit the straps to hold the bag to a body. Fastener material along an edge of the bag allows it be fastened to another pack.

Abstract: A heart pacemaker normally operates at a basic pacing rate having a basic escape interval between pacing pulses associated therewith, so that the pulses are delivered at the basic rate in the absence of a sensed, pacer inhibiting heart event. The pacemaker includes circuitry for setting a hysteresis interval, added to the basic escape interval, to form an extended escape interval in response to the sensed, pacer inhibiting heart event, with the hysteresis interval being a function of the basic escape interval length.

Abstract: The present invention is a universal interface allowing a main implant to supply power and receive data from remotely implanted sensor modules through a minimum number of interconnecting lines. The main module can supply a single DC voltage, two sequentially applied DC voltages or an AC voltage to the sensor module. A capacitor means in the sensor module supplies power while the sensor module is transmitting data.

Abstract: An implantable medical device for stimulating a physiological event in a patient at a stimulation intensity includes circuitry for adapting the stimulation intensity to the physical activity of the patient with refernce to a parameter contained within a physical activity signal obtained from a sensor. Circuitry is also provided for reducing, under certain circumstances, the sensitivity for the parameter of the physical activity signal which is used to adapt the stimulatin intensity. Reducing the sensitivity ensues dependent on the time over which the stimulation intensity is below a defined threshold. A method for operating the device is also disclosed.

Abstract: A silicon chip device composed of a large array of densely packed microphotodiodes is implanted between the inner and outer retina layers, in patients with vision-deficient eyes suffering from retinal dysfunction, to allow for useful formed vision. The photoactive surface of each photodiode, with its silicon deposited or etched electrode, point towards the incident light. The device produces an amplitude-modulated current to stimulate the inner retinal layer. The device is intrinsically inert due to its doped silicon substrate nature.

Abstract: A medical device adapted to be implanted in a patient includes components for detecting physiological events and/or for stimulating physiological events, and includes control logic connected to the detecting and or stimulating components, and further components for the telemetric transmission of data relating to the logical status of the control logic to and from an external receiver. The components for telemetrically transmitting data are connected to the control logic, and continuously transmit data identifying the current logical status of the control logic to the external receiver.

Abstract: Paraplegic patients and cetain other paralyzed patients who suffer from an upper motor unit spinal cord injury and undergo FNS (Functional Neuromuscular Stimulation) experience muscle fatigue within a time span that is usually shorter than is normal, but have no sensation of this fatigue due to paralysis. When FNS is used functionally, as is its implied purpose, to stand and walk, the patients need the support of a walker or canes or elbow crutches, and are unable to manually adjust FNS levels or pulse widths to compensate for that fatigue, since the time for this adjustment is exactly when the patients cannot divert attention and hands to anything else. Under FNS, the stimulated muscles produce an EMG (electromyographic) signal at the stimulated site, in response to that stimulation. This response-EMG undergoes pattern changes with the progression of fatigue.

Abstract: A belt for securing sensing electrodes to the chest of an infant afflicted with Apnea. The belt comprises an elongated band of fabric of sufficient length to encircle and to be fastened around the chest of the infant. The band has an inner side, an outer side and two ends. A tunnel is disposed on the inner side of the band and is adapted to removably receive and house wires for connecting sensing electrodes to an Apnea monitor. Two ports are disposed at the ends of the tunnel and arranged to allow wires to extend from the band and be connected to the monitor. Another port is disposed centrally of the band and arranged to form a port and allow wires to extend from the band to connect to the sensing electrodes. To fasten the belt to the infant, an interrelatable, two component, adjustable fastener is disposed on each end of the band.

Abstract: An MRI method is disclosed, by which, when liquid moving in a body to be examined stays in a predetermined region, this region is excited by using the nuclear magnetic resonance phenomenon and when the liquid thus excited moves from that excited region, a nuclear magnetic resonance signal produced by the excited spin and emitted during the relaxation time thereof is detected.

Abstract: A medical NMR scanner adapted to be supported on the floor of a building or other structure by vibration limiting supports is disclosed. The scanner includes a frame defining a patient-receiving space adapted to receive a human body. It also includes a pair of opposed polar regions aligned on a polar axis. The polar regions are disposed on opposite sides of the patient-receiving space. Structure is provided in each of the polar regions for producing a magnetic field within the patient-receiving space. Attenuators, positioned intermediate the frame and the building floor, are provided for attenuating transmission of vibrations from the floor to the magnetic field producing structure in order to reduce scanner image degradation.

Abstract: The present invention pertains to a fiducial implant for the human body that is detectable by an imaging system. The invention is comprised of a first portion and a second portion. The first portion is configured to be detected by an imaging system when placed beneath the skin. The second portion is configured for fixed attachment to a bone beneath the skin without penetrating entirely through the bone and without fracturing the bone. The first portion is of detectable size and comprised of a material for detection by an imaging system, and sufficiently small to avoid the distortion of the skin when placed at an interface between the skin and the bone. The first portion also has at least a portion which is spherical and defines a surface for cooperating with a tool for securing the second portion to the bone. Additionally, the placement into a fiducial implants, where n.gtoreq.

Abstract: An angiographic catheter includes a relatively soft, tip portion having a preformed curvature, and a resilient body portion extending therefrom having a preformed curvature in the opposite direction. A lumen extends through the catheter for the injection of angiographic dye therethrough to the right coronary artery. The part of the body portion of the catheter which it in the aortic arch of the patient during use has an amount of curvature which is less than the amount of curvature of the aortic arch, so that the body portion of the catheter is resiliently deformed where it passes through the aortic arch. The deformation results in the biassing of the tip portion of the catheter into the ostium of the right coronary artery.

Abstract: A method and apparatus for producing the Doppler audio output in a medical ultrasound system. The system includes a transmitter for transmitting ultrasound into a body, a receiver for receiving and processing echoes to produce a Doppler signal, and a Doppler signal processor for converting the Doppler signals into an audio signal that in turn is converted into audible sound. The system alternates between first time intervals during which the Doppler samples are produced, and second time intervals when imaging is performed. The improvement of the invention involves producing at least one actual spectrum of the Doppler signal, based upon Doppler samples produced during one of the first time intervals. A synthetic spectrum is then produced for an adjacent second time interval, based upon the actual spectrum. The synthetic spectrum is then converted into a corresponding time domain data set, and the audio signal for the second time interval is then produced based upon the time domain data set.

Abstract: Apparatus and method for representing slow motion of an oscillating heart by forming strobed images of the heart at a sequence of uniformly spaced times with controllable time interval lengths that are related to, but not identical to, the primary oscillation period T of the heart. The heart images may be formed at a sequence of times t=t.sub.0 +kMT.sub.h /N where t.sub.0 is an initial time, N is a positive integer, k=1,2, . . . , N-1 and M is a positive integer. Alternatively, the heart images may be formed at a sequence of times determined in part by the current oscillation cycle of the heart.

Abstract: Described herein are an apparatus and range of techniques used to study the retinal vasculature near the fovea, a description of the need and rationale for noninvasive in vivo monitoring of the retinal vasculature, a presentation of theoretical and practical considerations which demonstrate that entoptic visualization of the smallest capillaries near the fovea is optimized by a small short wavelength source (1 mm or less) rotating at 3.5 Hz in a circular path (radius 2 mm) imaged in the plane of the eye's entrance pupil and a discussion of the feasibility of using these techniques as a reseResearch relating to the development of the present invention was supported in part by grants from the United States Department of Health and Human Services (NIH EY08005 and EY07638). The United States government may have corresponding rights to the license and use of any resulting patent.

Abstract: A method for testing for biological molecular indicators in urine. Urine is transported through a sample container under pressure to flow through the sample container so that antigens in the urine are collected and bound on antibodies immobilized on the beads to form antigen-antibody complex. The beads are washed to remove cell debris and charged molecules and a specific prelabelled antibody solution is passed through the sample container with the prelabelled antibodies attaching to a receptor site on the captured antigen to form an antibody-antigen-prelabelled antibody sandwich complex. This sandwich complex is washed to remove cell debris and charged molecules and mixed with a color reagent solution which reacts with the prelabelled antibody to produce an color indicating the presence of a specific cancer antigen.

Abstract: A medical electrode lead employing one or more elongated electrode coils embedded in the surface of a flexible base pad. The electrode coils take the form of space wound coils following tortuous paths over the surface of the base pad to provide a large surface area electrode. The electrode coils include a plurality of spaced, generally parallel electrode coil segments. Located intermediate adjacent the parallel electrode coil segments are grooves or pleats, molded into the base pad. These grooves or pleats provide increased elasticity of the electrode and increased ability to conform to the contours of the heart. Insulative cores taking the form of plastic tubes are located within the electrode coils to prevent tissue ingrowth between the individual electrode coils, without induly reducing flexibility of the electrode.

Abstract: A body implantable electrode lead including a connector structure for enabling connection with an outermost conductor of the lead is disclosed. The implantable lead is of a multilayer configuration, being covered by an insulating biocompatible sheath. An annular section of the outer sheath is removed to expose a corresponding annular section of the outermost conductor of the lead. The exposed conductor section can be used as an electrode either directly or by attaching a conductive electrode ring via swaging, a conductive adhesive or the like.

Abstract: A method and devices for transcutaneous or transmucosal stimulation of the recurrent laryngeal nerve are provided. Recurrent laryngeal nerve stimulation is delivered by applying electric charge from an electrode in the form of a probe or an indwelling device to the intact neck skin at specific points along the tracheoesophageal groove or to mucosa within the esophagus, larynx, or trachea. In accordance with the present invention vocal cord excursion is related to frequency of the electrical stimulus.

Abstract: A limb protective covering having a tubular sleeve of waterproof material for receiving a limb and elongated closure member for tightening the sleeve around the limb. A portion of the sleeve above the closure member is folded over the closure member to form a cuff. A belt attaches to the cuff and wraps around the cuff to completely seal the covered limb.

Abstract: This invention relates to a protective mask, and more particularly to a protective mask usable during the act of oral sex or during the performance of mouth-to-mouth resuscitation to protect a wearer against infection with communicable diseases including viral diseases such as the human immune virus which leads to the development of acquired immune deficiency syndrome (AIDS). The mask is formed by an elongate, generally planar membrane of a tough film material having, when lying flat, a longitudinal axis and an outline configuration which is asymmetrical about that axis, the outline configuration having a lateral extension portion for extending downwardly and rearwardly over the chin of a wearer. The mask is securely wrapped in place over the lower face of a wearer while permitting free movement of the jaw, lips and tongue of the wearer and includes a flaccid pouch-like central portion.

Abstract: A restraint for disenabling a child afflicted with a compulsive biting syndrome from biting his or her hand or arm, yet otherwise permitting the child substantially free arm movement. The restraint is composed of a brief, two flexible extension members which are each attached to the brief, and a wrist band adjustably connected to each extension members. The object of the structure of the invention is to secure the brief about the waist and groin of the child, then secure each of wrist bands to the arms of the child adjacent the wrists, then adjust the length of the extension members so that the child will be able to move his or her arms in substantial freedom, yet not be able to move his or her arms so that his or her arm may come into contact with the his or her mouth, thereby preventing the child from biting himself or herself.

Abstract: An improved applicator for applying a topical anesthetic to a patient's mucosal tissue is disclosed, and includes a sponge-like dispenser member characterized by a relatively large surface area. The dispenser member is attached to an elongated handle. A predetermined quantity of the topical anesthetic is preapplied to the applicator member. A number of the applicators are stored in a refillable dispenser apparatus, wherein a refill dispsenser housing defines a number of applicator wells, each for receiving one of the applicators. The handles of the applicators can be color coded to indicate the flavor of the topical anesthetic which has been preapplied to the applicator.

Abstract: A dermally applicable patch adapted for application to the skin of the user to enable a transdermal administration to the bloodstream of a user. The patch comprises an outer layer which is impermeable to the passage of nicotine and an inner layer which may operate as a rate controlling membrane to allow the passage of nicotine into the bloodstream of a user. An outer layer and an inner layer form a nicotine receiving area for receiving the nicotine to thereby allow the same to pass through the inner layer. In a preferred embodiment, the patch is highly effective in reducing the incidence of tobacco smoking by allowing transdermal nicotine migration into the bloodstream of a user at a rate sufficient to correspond to the nicotine level in the blood achieved by smoking.

Abstract: Cigarette rods having fragments of metal therein can be efficiently and effectively separated from cigarette rods free of detectable metal particulates. A moving continuous rod exiting a rod-forming unit passes through a ring-like metal sensing device. The continuous rod is subdivided into individual rods of the desired length. A reject valve operates to isolate any rods determined to contain metal fragments. The process is performed to provide high quality control in the manufacture of cigarettes.

Abstract: The flavor substances of the present invention are prepared by toasting (heating) natural tobacco in an inert atmosphere at a temperature of at least about 225.degree. C., condensing at least a portion of the volatiles driven-off during the toasting, and collecting the a portion of the uncondensed volatiles by sorption (adsorption and/or absorption) on a solid or liquid sorbent medium. Either the sorbent medium containing the trapped volatiles or the volatiles themselves may be used as the flavor substances of the present invention.

Abstract: A process for manufacturing cigarettes which impose reduced health risks to the smokers thereof. According to this process redried cut rag tobacco is directly sprayed with one or more pre-selected alcohols (or other compounds) which are capable, when the vapors thereof are inhaled by the smoker, of inhibiting or blocking the selective localization of at least one nitrosamine and/or a metabolite thereof in the smoker's tissues, such as those of the epithelial lining of his lungs. An example of such an alcohol is cyclohexanol in an ethyl alcohol soltuion. Other preferred alcohols are 3-methylcyclohexanol, 1-hexanol, 2-octanol and t-butanol. After the alcohol either directly or in a solution (such as a flavorant--SD alcohol-4 solution) has been sprayed on the tobacco, preferably as it tumbles in the cooler cylinder of the mechanized cigarette making line, and allowed to dry, the tobacco is made or machined in a conventional manner into the final cigarette, either filtered or unfiltered.

Abstract: A cigarette including a tube of tobacco having a circumferential wall fabricated of a tobacco material with ridges and grooves from in the circumferential wall extending longitudinally of the tobacco tube, a wrapper of combustible material circumscribing the outside peripheral surface, and a filter rod attached at one end of the tobacco tube. Also, a method of making a cigarette includes forming a sheet of tobacco material, forming corrugations in the sheet of tobacco material and forming the corrugated sheet into a cylindrical tube.

Abstract: A hair treatment process and end wrap laminate for use in permanent hair waving, the process including wrapping hair to be shielded with an end wrap laminate comprising an exterior sheet of impermeable flexible plastic, an interior sheet of absorbent flexible paper and a middle layer of adhesive uniformly bonding the sheets together. Preferably the interior sheet is impregnated with a hair waving solution counteractant. The unique process and end wrap protects the hair from unwanted exposure to hair waving solution and counteracts the solution during the permanent hair waving process.

Abstract: The present invention provides a device which may be used during the application of eyelash makeup. The device consists of a body with each end conforming generally to the slanted curvature of the left and right human eyes and facial bone structures, with the connecting handle fastened to each end of an offset angle which results in a comfortable fit to the respective left or right eye. The handle fits in place between the nose bridge and cheekbone with the upper end of the body formed with a curvature so as to fit around the underside and outside of the lower eyelash of the user.

Abstract: A compact mouth and breath freshening apparatus which includes a multiplicity of individual elongated members with each elongated member carrying a swab that has been impregnated with a mouth and breath freshening agent. The multiplicity of elongated members are aligned in one or more rows and incorporated on a support base which in turn is housed within a compact carrying case. Alternatively, the multiplicity of elongated members are supported by having their respective swabs retained in a wrapper which in turn is supported in a case.

Abstract: An improved dental flossing tool having reciprocating tines supporting the flossing material and biased apart to assure proper tension on the flossing material, while having means carried by the tines for moving the flossing material between the tines and having removable head means to permit replacement of the head to provide sterile use for subsequent users.

Abstract: A dental floss container holder and floss dispenser having a housing with a front and back portion. A contoured resilient material made of closed or open cell foam or neoprene for retaining variously shaped dental floss containers and spools. The retaining material is affixed to the interior of the housing. A guide directs floss from the retained container to the exterior of the housing. A cutter is positioned on the exterior of the housing. The housing may be wall mountable.

Abstract: A roll-over high-pressure washer for non-contact washing of stationary vehicles. A gantry frame having two independent U-shaped spray arms is mounted to roll back and forth over the vehicle, while independent low- and high-pressure spray systems mounted on each of the U-shaped spray arms pre-soak, wash and rinse the vehicle in a preprogrammed sequence. The U-shaped spray arms are maintained in close proximity to the upper surfaces of the vehicle, without contacting them, by primary non-vehicle-contacting and secondary vehicle-contacting sensing means. Side spray arms are also mounted on the gantry frame to wash the side surfaces of the vehicle.

Abstract: In a method for determining an end of cleaning of a semiconductor manufacturing apparatus according to the invention, when the interior of a semiconductor substrate process chamber of the semiconductor manufacturing apparatus is cleaned by dry etching using plasma discharge, a constant current or voltage is supplied from a high-frequency power source to discharge electrodes during plasma discharge, an impedance between the electrodes or a temperature in the process chamber is monitored, a time point at which the impedance or temperature is abruptly changed is detected, and this time point of detection is determined to be an end of cleaning.

Abstract: An enclosed valve with one inlet connected by a rotating gate to two alternative outlets. The fluid pressure keeps the gate in position to seal the first outlet while the second one is open. When the pressure is sufficiently reduced, a spring releases the gate from the first outlet and swings it to a new position, whereby it leaves the first outlet open and seals the second outlet. That gate position is maintained upon repressurization until a new pressure drop is experienced. Then, the reverse takes place and the gate swings in the opposite direction to open the second outlet and again seal the first one.

Abstract: A method and apparatus for applying liquid coating materials, adhesives or other liquids is provided in which the liquid material is pumped from a source through a pneumatically operated, diaphragm-type pressure regulator which discharges the liquid at a controlled pressure to a dispenser such as a spray gun. Pressurized air from a pneumatic panel or other air supply device is transmitted to one side of the diaphragm in the pressure regulator through a one-way valve such as a check valve which protects the pneumatic panel from an upstream flow of liquid from the pressure regulator in the event of a failure of its diaphragm.

Abstract: An automated chemical storage and feed system for a use station to chemically treat and monitor a process at a use station where the process is being run, including one or more base tanks at the use station storing chemicals and having means intermittently or continuously feeding the chemicals to the process. A level sensor is provided in each base tank to determine the chemical level and to deliver a signal to a control and processing unit. Sensors may be provided on the process for generating chemical condition information to the control and processing unit.

Abstract: A device for a dishwasher comprising a tub (10) in which liquid is circulated for cleaning the dishes. The dishwasher has a drain pump (14) with an inlet which is placed adjacent the bottom of the tub and a conduit (16) which is connected to the outlet (15) of the pump through which the liquid is emptied from the machine. The conduit comprises an ejector (17) through which the liquid flows during emptying, the suction side of the ejector being connected to the tub.

Abstract: A connection for extensions for vehicle tire inflating valves comprises a body consisting of two portions, one of which is to be joined with the extension and the second is to be connected to the valve and ends in an appendage for actuating the valve moving element. The second portion of the body comprises a cylindrical element with a smooth side surface having, near the appendage, a radially operating sealing ring.

Abstract: The valve assembly comprises a body formed of substantially identical, or identical plates, in which one is the mirror-image or reverse of the other. The plates are held apart, in parallel planes, by an enveloping seal. Each plate is ported for the conduct of fluid therethrough in cooperation with a fluid-conducting void formed in the confronting plate. Flapper-type valving elements are confined within the body, between the plates. A single, centrally-disposed fastener secures the plates and the assembly together, and constitutes the means for the simple disassembly of the unit.

Abstract: In a fuel tank structure for an automotive vehicle, a fuel collector unit includes a collector body which is provided with a fuel collecting chamber and a fuel passage. The fuel passage has an inlet adjacent to a bottom wall of a tank body and an outlet opening toward the fuel collecting chamber for conducting fuel in the tank body into the fuel collecting chamber. The fuel passage is arranged such that the fuel below a predetermined vertical level at a certain location in the fuel passage is prevented from flowing out through the inlet. The fuel collector unit further includes an ejector which ejects oversupplied return fuel into the fuel passage through the inlet so as to suck the fuel therearound. The sucked fuel is mixed with the ejected return fuel and introduced into the fuel passage through the inlet.

Abstract: A hydraulic coupling assembly having first and second connectors for making fluid connections between two hydraulic fluid lines. One of the connectors has a stationary valve assembly with a valve element moveable into and out of engagement with a valve seat. The other connector has a moveable valve assembly with a second valve element movable into and out of engagement with a valve seat. The valve assembly is movable on a plunger with respect to a connector housing. A bias mechanism such as a spring biases the plunger outward with respect to the housing. When the connectors come together, the valve tips bear against each other and are mutually retracted with respect to the respective valve seats. The bias mechanism acting on the plunger in the second connector maintains the valve elements in contact with one another and in a deflected state permitting hydraulic fluid passage through the fluid passage opened between the connectors.

Abstract: A fluid controller (11) is provided of the type including a primary, rotatable spool valve (35) and a relatively rotatable follow-up sleeve valve (37). The spool and sleeve define a main fluid path in response to relative rotation, the main fluid path including flow through a fluid meter (17). In accordance with the invention, the spool and sleeve are also moveable axailly relative to each other to define a separate fluid path, in parallel with the main fluid path, the parallel fluid path preferrably excluding the fluid meter (17). Axial actuation of the spool and sleeve relative to each other may be accomplished by controlling fluid pressure in a pair of axial fluid chambers (69, 83). The control of the fluid pressure may be accomplished by any suitable electrohydraulic means (95) or hydromechanical means (181).

Abstract: A flow selector device whose fluid flow is regulated by the rotational setting of a rotor body in a housing; and although the metering passageways have outlets spaced from the axis of the rotor and its manipulating shank, other passageways are provided in the housing, which channel the fluid then to an outlet in and concentric with the rotor and its flow-rate adjustment shank. One of those other passageways is an annular groove formed into the rotor's manipulating shank, leading to a radial passageway in the shank, thus carrying fluid to the shank outlet channel regardless of the rotational setting of the rotor. Another of those other passageways is in the housing; and its provision is facilitated by forming it to open onto an outer face-portion of the housing, then sealing the outer portion of the passageways by a ball member forced into the outer end of the passageway. The rotor is held axially of the rotor by a snap ring, and by a nylon ring between the snap ring and the housing.

Abstract: The present invention relates to rod plug caps for leaky tubes of a heat exchanger. The rod plug caps include a frustrum shaped tapered hollow plug having a top, a length, and a diameter. The diameter of the top being the widest of the plug. A plug nut is formed on the top of the plug. The plug nut and the plug are formed from one homogeneous piece of material.