Abstract: An anesthesia conduit for connecting a tracheal tube and a gas circuit. The connector includes a flexible portion integral with a substantially rigid longitudinally extending portion. The longitudinally extending portion may include two ports, one connected to apparatus such as an respiratory gas monitor, and the other configured such that suction catheters can be inserted into the conduit and tracheal tube.

Abstract: An ultra-thin wire reinforced endotracheal tube which includes a novel sealing design adapted to fit in a complementary manner in a subject's larynx. The endotracheal tube includes a laryngeal section which has a cross sectional shape and size that are complementary to a subject's glottis. Preferably, the laryngeal section has an oval or egg-shaped cross section. A plurality of thin, pliable sealing "gills" are provided on the surface of the laryngeal section. The gills provide a fluid tight seal which does not harm a subject's larynx. The endotracheal tube is reinforced with a metallic spring material. In a preferred embodiment, the metallic spring material is a shape memory alloy. The use of a shape memory alloy prevents damage to the endotracheal tube caused by distortion, such as kinking, crushing, etc.

Abstract: An endotracheal tube holder that includes a face plate assembly which is attached to a patient's head by an adjustable headband. The face plate assembly is formed with a face plate adapted to be positioned over the mouth of the patient and is formed with an open end channel terminating with a V-shaped notch over which is superposed a tube holding block that is affixed to the outer surface of the face plate, and also includes a matching V-shaped notch in which an endotracheal tube can be fixedly positioned by a thumb screw, a bite block being integrally secured to the inner surface of the face plate which is also provided with an aligned V-shaped notch. The face plate also includes an opening for ready access to the patient's mouth, as might be required.

Abstract: A tracheostomy device having an inner cannula with a connector head and an outer cannula. The inner cannula is secured within the outer cannula by a locking device having spaced apart, elongated handles that are pivotally mounted on the inner cannula. The handles are spaced such that a connector may be mounted on the connector head, thereby preventing movement of the handles. A method of locking the inner cannula to the outer cannula is also described.

Abstract: The present invention provides an insulated breathing tube arrangement to prevent heat loss from the inhalant gas in a recirculatory aided breathing circuit thereby reducing internal vapor condensation commonly associated with such breathing circuits while also stabilizing the relative temperature and humidity within such breathing circuits. The insulated breathing tube arrangement includes a thin flexible partially longitudinally compressed casing surrounding a thicker corrugated tube. The thin casing allows for hairpin bending of the breathing tube arrangement and provides an insulating dead air space around the corrugated tube. In another arrangement selected enlarged corrugations are provided in spaced relation along the corrugated tube to engage the inner surface of the casing in a preselected spaced arrangement with respect to said corrugated tube to compartmentalize insulating dead air spaces between the tube and the casing.

Abstract: The present invention is directed to an improved nebulizer attachment for use with a powered nebulizer machine for converting liquid medication into aerosol. It includes a reservoir chamber for liquid medication which is adapted to be oriented substantially vertically, has a gas inlet located thereon for connection to a nebulizer machine and has the capability therein to intermix the incoming gas with the liquid medication to create an aerosol. There is also an aerosol outlet for connection to a face attachment for delivery of the aerosol to a user. The present invention also includes a face attachment indirectly connected to the reservoir chamber. Finally, there is a hollow fitting located between the reservoir chamber and the face attachment. This hollow fitting is formed of a plastic tube having a plurality of circumferential, unconnected corrugations of a semi-flexible nature and has only three rest positions for each such corrugation.

Abstract: A respiratory or respiration hose is made of a transparent or translucent material, e.g. a silicon caoutchouc, the hose has a helical, preferably hollow ridge or bar on its outer surface bonded thereto by a silicon based adhesive; heating conductors means are arranged on a foot portion of the ridge, on one or both sides of the foot portion of the ridge and are adhesively bonded to the hose; a return conductor may run through the hollow ridge interior; heating current is fed to the heating conductor which is provided in parallel or serial connection.

Abstract: An endotracheal tube (38a) demountably attachable to and for use in combination with an oral airway (10) having a tabular flange (22) with C-shaped openings thereon, the endotracheal tube (38a) having an elongated hollow tubular body (56) with first open end (60) and a second open end (62), the body (56) having a portion containing alternating ribs (50) and bays (52) integral with the body of the endotracheal tube (38a). The bays (52) are dimensioned to fit snugly within the C-shaped opening of said oral airway (10) and the ribs (50) being dimensioned to prevent longitudinal displacement of the endotracheal tube (38a) with respect to the oral airway (10).

Abstract: A method for providing continuous oxygen therapy to a patient having chronic breathing problems wherein the method includes the steps of providing cricothyroidal-endotracheal device and having a hollow tube of semi-rigid material having a plurality of spaced holes extending through the tube wall and connected at its proximal end to the distal end of a flexible hollow tube, in turn, connected at its proximal end to the distal end of a hollow semi-rigid tube for connection to an oxygen supply source for feeding oxygen through such connected tubes and the holes through the semi-rigid tube wall and a flange fixed to the outer wall of the oxygen supply tube, providing an oxygen source, creating a surgical opening in the patient, inserting the device through the surgical opening, positioning the device in the surgical opening and the trachea, connecting the device to the oxygen supply, delivering oxygen through the device, and leaving the device in the place in the surgical opening for extended period of time to tr

Abstract: Intubation apparatus including an airway device, or main tube, which is to be inserted via the patient's mouth and then into the patient's trachea or esophagus. Components within the main tube are selectively operable for establishing either a first airflow path along the length of the main tube or a second airflow path between the proximal end of the main tube and lateral passages provided in the main tube wall, depending on the location of the main tube. An auxiliary tube is secured to the main tube so that the interior of the auxiliary tube communicates with the interior of the main tube at a location downstream of the lateral passages provided in the main tube wall. A suction tube is insertable through the auxiliary tube and into the main tube to a location beyond the distal end of the main tube.

Abstract: A respiratory intubating device for carrying a gas to or from the lungs of a patient including a flexible tubular member having a pair of parallel lumens for extending from a proximal area at the patient's mouth to a distal area at a bronchus of the patient, and an adapter integrally connected to the tubular member for interconnecting the tubular member with a source of gas and for providing access for surgical instruments. The adapter includes a Y-shaped member having a pair of hollow branches which lead to the pair of lumens of the tubular member and a pair of hollow stem members integrally connected to the hollow branch members at about a right angle thereto, and extending upwardly to aim across the patient's face. The Y-shaped member including the junctions of the branch members and the stem members are encased in a soft flexible plastic.

Abstract: The invention relates to a fastening member (1) which is placed into a patient's cavity, such as a nostril, surrounded by tissue, and which allows a flow through the cavity through a port (5) and which can be joined to the measuring device via a suitable connecting piece (2). The fastening member (1) is flexible, whereby it can be formed, before being placed into the cavity, into a shape or size which fits better into the cavity, whereupon the fastening member, in the cavity, tends to return towards the original state by pressing against the surrounding wall of the cavity.

Abstract: A sampling adaptor suitable for use in a unilimb breathing system with three or more hoses that includes a breathing hose connector, a swivel to allow the breathing hose connector to rotate freely in relation to the remainder of the adaptor, an angular swivel to allow adjustment of the angular shape of the adaptor, a filter that encloses the sampling end of a flexible sampling hose, a patient end connector, is disclosed herein.

Abstract: An apparatus for carrying out tracheostomy tube replacement includes the use of a specially constructed obturator having a central longitudinal opening. The central opening of the obturator allows the obturator to pass over a guide tube which has been left in place after removal of the old tracheostomy tube. The obturator also has an atraumatic rounded tip to make passage of the obturator and replacement tracheostomy tube assembly through the stoma and into the tracheal lumen safer and easier, guided by the emplaced guide tube.

Abstract: An esophageal gastric apparatus includes a first elongated tube with forward and rearward ends, and a second tube inserted within the first tube with the forward end of the second tube projecting from the forward end of the first tube. The rearward end of the second tube projects outwardly through the wall of the first tube adjacent the rearward end of the first tube. The second tube has an outside diameter less than the interior diameter of the first tube, so as to form a cavity between the second tube and the first tube. A plurality of apertures are formed in forward end of the first tube, with a diaphragm surrounding the apertures, so as to transmit sound through the first tube to the rearward end thereof. The second tube has suction ports formed in the forward end thereof to suction fluid and material therethrough.

Abstract: The present invention is directed to novel system, apparatus and methods for securing the longitudinal position of a diagnostic catheter relative to a patient while maintaining established ventilating parameters within a ventilating circuit or when a patient is intubated and non-mechanically ventilated and it is necessary to deflect exhaled gases from the patient. Disclosed is a tubular elbow having nonlinearly aligned first and second ends connectable to the proximal end of an endotracheal tube adapter and a circuit of a ventilating machine. An access vent is formed through the outer wall of the tubular elbow to enable the diagnostic catheter access to the endotracheal tube adapter. Located at the access vent is a gasket having a centrally located aperture capable of making sealing engagement with the outer surface of the diagnostic catheter when the diagnostic catheter is disposed in the access vent, thereby preventing the loss of established ventilating parameters.

Abstract: An endotracheal tube is equipped for delivering a drug externally of the tube. The endotracheal tube includes a tube body having proximal end and distal ends, and at least one flexible irrigation cannula extending along the endotracheal tube body to its distal end. An irrigation diffuser means is attached to the irrigation cannula for spraying a drug delivered through the irrigation cannula externally of the endotracheal tube body. The endotracheal tube is particularly intended for artificial ventilation in surgical operations and in intensive resuscitation treatments. It is useful for the repeated administration and re-administration of drugs, for instance, of local anesthetics, anti-inflammatories and mucolytics in the course of intubation.

Abstract: The disclosure is of a catheter assembly including a hollow T-shaped member having a patient end and a rear end which is blocked from the patient end by a wall. A catheter is adapted to be introduced through the rear end of the member into a patient and the rear end includes a sponge, located out of the airway of the patient by the wall but the wall includes means for opening the wall to let the catheter through it for introduction into the patient. The sponge cleans the catheter as it is withdrawn but mucus cannot be returned to the airway to the patient.

Abstract: An endotracheal device for passing fluids into or out of the body includes a tube member with a laser reflective material in the form of a flexible sheath that is covered by a flexible non-metallic protective covering. The laser reflective material is preferably metallic and can be formed of aluminum, copper, silver or stainless steel. Flexibility of the laser reflective material is obtained by applying the sheath to the tube member in the form of a spiral or in a corrugated form. A protective covering is provided over the laser reflective material and is preferably formed of a polytetrafluoroethylene material. The protective covering, coating or tubular wrapping is applied in a manner which enables such covering to rupture or break when a laser beam strikes the tube. The area of breakage of the protective covering exposes the underlying laser reflective material thereby enabling the laser beam to be reflected away from the tubular member.

Abstract: A simple flexible connector tube for use between an anaesthetic machine or a respirator is described. A flexible corrugated pipe is divided by an internal common wall into a larger and smaller flow passage and is provided with a bayonet type connector at the patient end and at least one of a quick release double friction fit connector at the machine end.

Abstract: Disclosed are a novel device and novel methods for securing nasal tubing in medical patients. The invention provides, with minimal trauma, discomfort, and distraction to the patient, a means of securing in place nasal tubing inserted through the nasal passage. In addition, the disclosed invention provides a device which can be replaced without removal of a nasal tube already in place.

Abstract: A composite of an adhesive layer, foil, a fire retardant fabric, and a hydrogel which is used to protect objects during laser surgery and which possesses favorable burning, flashing, and resistance to burn through properties. The hydrogel is preferably a hydrophilic material such as a polyurethane, collagen, polyacrylonitrile, polyvinyl alcohol, or polyvinyl acetal. The fire retardant fabric is preferably a fabric woven or knitted from polyamide or polyimide fibers having a thickness sufficient to provide the desired degree of protection. The composite is applied to the object to be protected, which can be a person or an endotracheal tube or surgical instrument, using the adhesive to adhere the composite thereto.

Abstract: A medical tube holder for attachment to a patient's nose septum for holding medical tubing inserted into the patient's nose. The tube holder includes opposite upstanding clamp arms defining an acute included angle therebetween for insertion into the nostril and thereby into clamp engagement on opposite sides of the patient's septum. One of the nasal clamp arms includes a tube holder section for substantially surrounding and maintaining medical tubing in position. A thumbscrew adjusts the distance between the upstanding clamp arms and therefore the clamping pressure on the septum. A rotating screw in another embodiment is fixed to one clamp arm and threadably mounted on another clamp arm to provide threadable adjustment. A locking pin and detent configuration in a further embodiment enables adjustment of the clamp arms between preset positions. An integral unit in a still further embodiment with two opposing upstanding clamp arms set at an optimum acute included angle therebetween.

Abstract: A mouthpiece assembly for a breathing apparatus comprising a housing, a disposable liner, and a protective sheath. The housing comprises a conical opening extending therethrough. The liner is conical and is adapted to be received in the housing. A seal is provided between the liner and the housing to prevent leakage of air. The liner includes a member for engaging the lips of the user when the mouthpiece is in use. The sheath is located between the housing and the liner. Additionally, the liner includes alignment members which are suitable for aligning the liner with the housing and for spacing adjacent liners when they are stacked.

Abstract: A dual-purpose catheter for performing suction or oxygen feed on a patient including two cylindrical bodies rotatably coupled together and held together by a spring which is biased to hold the bodies in a first position with respect to each other but permits rotation to a second position. One body includes first and second tubes which can be coupled to a source of suction or a source of oxygen, and the other body includes means for receiving said tubes in a tight fit and tube means for coupling either suction or oxygen to the patient, depending on the rotation state of the two bodies with respect to each other. The catheter bodies include solid tubes positioned to block the oxygen path to the patient when suction is operating and to block the suction path to the patient when oxygen is operating.

Abstract: A nebulizer for use in administering medication to a patient includes a tubular body having opposed ends, a central portion defined by one-way valves and having a vial attached thereto, a nebulizer jet device disposed in the vial and including a multiple baffle arrangement configured to deliver a substantial amount of optimally-sized aerosol particles to a patient through inhalation at one of the tubular ends.

Abstract: A micro air-wave detection device particularly for breathing monitoring and surveillance, which comprises a tube (2) having a ball (5) disposed therein with minimum clearance. The tube (2) is disposed in a horizontal or slightly inclined position and is connected to a conduit (38) which picks up the pressure variation of a nasal respirator (53). Detection of the to-and-fro movement of the ball at the level of an independent detection unit (10) containing the tube is transmitted by optical fibers (45) to an electronic control and alarm module (22).

Abstract: Apparatus and method for selective, separate or simultaneous collection and analysis of nasal gases and oral gases, and mixtures thereof, respired by a patient, with optional simultaneous delivery to the patient of selected inhalant gases. The apparatus comprises a nasal gas cannula and an oral gas capture member constructed and arranged to avoid or minimize contact with the patient's mouth and other facial surfaces.

Abstract: An attachment for a prior art, hand-held, aerosol generating nebulizer, which enables the patient by flexing a flexible hose containing adjustable exhalation holes to control range of passive to active exhalation resistance, and which also contains a one-way valve to prevent medication wastage, and yet, allow the patient to draw in room air as needed. Also, included is a circular or wide oval shaped mouthpiece that allows the patient to inhale freely without the restriction of the conventional flat mouthpiece.

Abstract: A flexible tube connector adapted for use in delivering a general anesthesia to patients via a nasotracheal tube is disclosed. More specifically, the present invention relates to a quick insertion nasotracheal tube connector which is designed to facilitate access to the oral cavity and face.

Abstract: An anesthesia rebreathing system including a single use structural portion and a reusable structural portion configured so as to be readily latched together to automatically couple respective fresh gas interface ports and patient overflow ports. The single use portion includes a patient bag which is mounted in a closed rigid container in the reusable portion. Gas pressure in the container is controlled by an anesthetist squeezing an outside bag or by a mechanical vertilator, as determined by the setting of a user operable control knob subassembly, which also functions to establish gas pressure and volume in both the patient circuit and the control circuit.

Abstract: A breathing circuit for providing conduit from a breathing apparatus or anaesthetic device to a patient, the breathing circuit being generally coaxial and including a first flexible tube and a second flexible tube inside the first flexible tube. The first flexible tube has a smooth inner surface and a reinforcing cord or ribbing along its length and integral around its outer surface. The first flexible tube has a relatively thin wall with the cord, which is preferably in a spiral, providing structural strength or stiffness while retaining flexibility.

Abstract: A breathing apparatus includes: a vessel member having a mouth piece and internal influx chamber; a tubular communication member having opposite ends connected respectively to the intake and outgo ports of the vessel member in such a manner that the vessel member and the communication member define a circular passage for a respirable gas; an oxygen-supplying mechanism for supplying the circular passage with the respirable gas; a pair of check valves, disposed respectively at the intake and outgo ports of the vessel member, for limiting the flow of the respirable gas in the circular passage to a single direction so that, when the person breathes into the influx chamber, the respirable gas in the influx chamber is introduced into the communication member through the outgo port and, when the person inhales through the mouth piece, the respirable gas in the communication member is recycled into the influx chamber through the intake port; and an outlet port for discharging excess respirable gas out of the circular

Abstract: A combination endotracheal tube and stethoscope is provided so as to allow simultaneous patient ventilation and monitoring of vital sounds by a single instrument. The tracheal tube includes an inflation cuff adjacent the distal end and a longitudinal pressure conduit to inflate the cuff so as to peripherally seal the assembly against the trachea wall. An audio cuff extends at least partially coextensive and concentrically with the inflation cuff and has sufficient resiliency to vibrate in response to the patient's vital sounds. The inflation cuff comprises a highly flexible bulb in direct contact with the trachea wall and the audio cuff is a sleeve inside the bulb and spaced peripherally from the tube to allow vibration. The sleeve is sufficiently stable and maybe foam-filled to maintain the spacing even upon inflation of the bulb. Preferably, the sleeve is positioned wholly within the inflation bulb.

Abstract: The present invention discloses an improved fenestrated tracheostomy tube which includes a tubular outer cannula which has a distal end for insertion within the trachea and a proximal end which remains outside of the patient. The outer cannula has a generally circular longitudinal radius of curvature and has an upper wall portion with a longitudinal center along its uppermost surface. The tube includes a disposable inner cannula having a distal end and a proximal end which is adapted to fit closely within and to be removably inserted into the outer cannula. The outer cannula has a plurality of slotted fenestrations through the upper wall portion arranged so that each fenestration is slightly spaced from the longitudinal center and forms an acute angle away from the longitudinal center in the direction of the distal end of the outer cannula. With the foregoing fenestration arrangement, the inner cannula is readily inserted into the outer cannula free from interference with the fenestrations.

Abstract: An endotracheal tube having dual passages provided by the merging of a ventilation tube and a suction tube. The ventilation tube is adapted to project into a patient's trachea to the position of the carina anterior. An inflatable cuff surrounds the ventilation tube and prevents passage of fluids to and from the lungs. The suction passage terminates at the cuff with openings into the suction passage for suctioning secretions that pool around the cuff. The tubes as merged enable entry of the dual passages into the trachea past the vocal cords. As protruded from the patient's mouth, the tubes are separated to be connected to the respective ventilation machine and secretion suction machine.

Abstract: An adhesive coated sheet particularly shaped to facilitate the anchoring of a nasal-gastric tube to the nose of a patient to prevent accidental dislodgment thereof.

Abstract: An anaesthetic system comprising, (a) inspiratory low pressure fresh gas supply tube adapted to receive low pressure gas and adapted for attachment of a reservoir bag tube and having a valve for control of gas to and from the reservoir bag (b) an expiratory tube comprising: (i) a valve to open or close the tube to permit from free up to totally restricted flow of gases in and out of the expiratory tube and (ii) a relief valve to permit gases to exit when pressure in the expiratory tube exceeds a predetermined value (c) the inspiratory and expiratory tubes communicating with a patient's face piece and being substantially free of restricted flow of gases whereby a universal mode of anaesthetic administration to a patient can be achieved.

Abstract: A coaxial breathing circuit is disclosed and which includes an inner tube for supplying fresh gas to a patient, which may contain a vaporized anesthetic for anesthetizing the patient, and a corrugated outer tube for conducting the patient's exhaled gases from the patient. At the patient end, there is allowed a slippage between the inner and outer tubes to provide flexibility of the overall circuit to bending. At the the machine end, the end that is connected to a mahcine supplying the inspiratory gas, a connector provides the means to join the inner and outer tubes to a male coupling or directly to a male fitting on the machine. The corrugated outer tube is joined to the connector and an outlet is provided for the discharge of the exhaled gases. For the coaxial circuit to be operable, the inner tube is sandwiched between the outer diameter of the male coupling and the inner diameter of an opening in the connector.

Abstract: Improved connectors are disclosed for a Bain anesthesiology circuit. At the end remote from the patient, positive connections are made to the anesthesiology gas supply tube. The construction of the fitting for the exhaust is such as to apply a crank action, facilitating tight insertion of the fitting into an exhaust connector. At the patient end a positive locking connection is made to the endotracheal tube or the like, and a secure connection permitting a certain degree of turning without twisting of the inner tube is provided.

Abstract: A combination endotracheal tube and stethoscope is provided so as to allow simultaneous patient ventilation and monitoring of vital sounds by a single instrument. The tracheal tube includes an inflation cuff adjacent the distal end and a longitudinal pressure conduit to inflate the cuff so as to peripherally seal the assembly against the trachea wall. An audio cuff extends at least partially coextensive and concentrically with the inflation cuff and has sufficient resiliency to vibrate in response to the patient's vital sounds. The inflation cuff comprises a highly flexible bulb in direct contact with the trachea wall and the audio cuff is a sleeve inside the bulb and spaced peripherally from the tube to allow vibration. The sleeve is sufficiently stable to maintain the spacing even upon inflation of the bulb. Preferably, the sleeve is positioned wholly within the inflation bulb. The pressure conduit extends longitudinally along the tube and opens into communication with the inflation cuff.

Abstract: An adaptor for converting patient breathing apparatus from the "circle" to the Bain circuit configuration. The adaptor facilitates rapid conversion of the patient breathing circuit without necessitating duplication of breathing circuit components and without the need for an expensive Bain circuit mount. The adaptor substantially reduces the complexity of the conversion operation, thereby minimizing the possibility that an erroneous circuit may be established with the attendant possibility for patient injury.

Abstract: A tracheostomy device for insertion into the trachea for ventilation has first and second cannulae. A sealing cuff on the first cannula forms a seal with a wall of the trachea. A housing attaches to the first and second cannulae and communicates with an outside air source. The housing contains a dual valve system including a swingable check valve connected by a toggle link to a plug valve. The check valve and plug valve move together from a first position in which the plug valve closes the second cannula preventing air from escaping to an upper portion of the trachea and the check valve is away from a housing aperture allowing air to flow from the air source through the housing, the first cannula, a lower portion of the trachea and to the lungs.

Abstract: An artificial respirator of a high-frequency oscillation ventilation type is provided which is free from a risk of increasing pressure in the airways. The respirator comprises a double communication tube with inner and outer tubes. One of the tubes is utilized for feeding a respiration or anesthetic gas to the airways through an endotracheal cannula, and the other tube is connected to a communication tube in which two jet air injection tubes are provided. The first jet air injection tube is utilized for injecting a jet respiration gas to thereby transmitting high-frequency oscillations to the respiration or anesthetic gas. The second jet air injection tube is utilized for injecting a jet respiration gas toward outside of the communication tube from therewithin thereby to decrease the pressure in the communication tube and hence in the airways.

Abstract: A system for applying to a person's respiratory system pressure pulses having a high energy density. The system includes a manifold for applying gas pulses to the mouth or throat of a person, a first conduit for supplying gas from a gas source to the manifold, and a first valve disposed on the conduit adjacent to the manifold for interrupting the flow of gas through the conduit to thereby produce gas pressure pulses which flow to the manifold and then to the person. A second conduit coupled between the gas source and the manifold is also provided. A second valve is disposed in the second conduit to normally block the flow of gas therethrough and for periodically opening to allow gas to flow to the manifold. A pressure transducer is disposed between the second valve and the manifold for detecting the pressure in the manifold and for supplying a signal to the gas source indicating what the pressure in the manifold is.

Abstract: A flexible tubular assembly having an outer flexible tube through which extends an inner flexible tube which is connected to a tubular element having an elbow-shaped locking piece. The outer flexible tube is joined to the tubular element and the inner flexible tube extends through a cylindrical section of the tubular element to the exterior of the element thereby exposing the end portion of the inner flexible tubing. The spout area of the elbow-shaped locking piece is inserted into the inner flexible tubing and thereby distends the tubing against the sides of an internal tubing and thereby distends the tubing against the sides of an internal tubular stub within the tubular element and locking the tubing in place. Outwardly extending ears on the elbow engage inwardly extending slots on the tubular element thereby holding the elbow in place. The device is specifically useful in anaethestic devices insuring the safety of a patient.

Abstract: A breathing circuit which comprises a coaxial tube type main tube comprising an inner flexible tube constituting an inhalant circuit and a corrugated outer tube having a larger average wall thickness than said inner tube, encircling the periphery of said inner tube, and defining an exhalant circuit in conjunction with said inner tube; and an inner tube retaining member disposed at least at one end of said coaxial tube type main tube and serving to keep said inner tube and said outer tube at a prescribed distance from each other.

Abstract: A breathing circuit includes a double-wall coaxial main tube comprising a flexible inner tube forming an inhalation path and a corrugated outer tube disposed outside said inner tube and defining an exhalation path in conjunction with said inner tube; and a manifold including two sets of coaxially disposed inner and outer manifold tubes positioned along the length of the coaxial main tube and connected to corresponding tubes of the main tube. The manifold being provided with (a) a nebulizer which closes off confronting ends of connected sections of the outer tube in an axial direction and communicates with inner spaces of connected sections of the inner tube of the coaxial main tube, (b) a bypass interconnecting the exhalation path of the two outer tube sections which are closed and separated by the nebulizer, and (c) an exhalation valve provided in the bypass path and including a valve body capable of closing the bypass during inhalation.

Abstract: An improved respiratory apparatus for conducting flow of supply and exhausted respiratory gas between a ventilator and a tracheal tube incorporates features and combinations of features, including aspiration, periodic pressure relief immediately downstream from the tracheal tube connection, coaxial flow conduits, to improve the form of pressure variations at the tracheal tube.

Abstract: An anaesthesia-breathing apparatus for supplying gas to a patient for artificial respiration, supported respiration, anaesthesia purposes or combinations of such purposes. The apparatus comprises a gas chamber connected to a patient connection piece, a respiratory gas receptacle, for example in the form of a respiration bag, a first check valve adapted to permit discharge of excess gas from the breathing apparatus to the atmosphere and, optionally a filter for absorption of carbon dioxide from recirculation breathing gas. Security and venting valves are not required for the patient's security during manual operation of the respiration bag because the gas chamber is in communication with the patient connecting piece via a control valve which alternately conducts exhaled gas to one end of a recirculation gas chamber or closes the communication to the recirculation gas chamber and conducts the exhaled gas from the gas chamber to the patient.