Abstract: Apparatus for connecting a patient to a breathing device such as a respirator, anesthesia machine or the like is disclosed, including a Y-piece including a patient attachment tube, and a pair of additional attachment tubes adapted for connection to an inhalation tube and an exhalation tube, respectively, and including a bacteria filter disposed within the apparatus and separating the patient attachment tube from the two additional attachment tubes so that gases passing between the patient attachment tube and these two attachment tubes along a predetermined flow path must pass through the bacteria filter. In one embodiment the apparatus includes a partition wall arranged for separating inhaled air and exhaled air during passage through the Y-piece.

Abstract: Optical gas analyzers are disclosed for analyzing gas samples, including a source of radiation, a gas sample cell through which the radiation passes, a mirror for dividing that radiation into a number of secondary radiation paths for each of the gases in the gas sample which is to be analyzed, with the mirror being arranged so that after a single reflection from the mirror each of the secondary radiation paths is directed to an optical filter which passes a preselected wavelength characteristic of the particular gas in question, and then to a detector for measuring that wavelength characteristic. These optical gas analyzers are preferably used in connection with gas samples which include anesthetic gases, along with CO.sub.2 and N.sub.2 O.

Abstract: Apparatus for delivery predetermined dosages of anesthetic gases are disclosed, including a reservoir for supply of anesthetic liquid, gasification chamber, a riser for delivering anesthetic liquid from the reservoir to the gasification chamber which is maintained at a predetermined temperature at which the anesthetic liquid is converted directly into anesthetic gas, a gas supply for maintaining the anesthetic liquid under a predetermined gas pressure which substantially corresponds to the pressure at which the anesthetic liquid is delivered to the gasification chamber, and a delivery line for controllably delivery the anesthetic gas from the gasification chamber.

Abstract: Anesthesia or respirator apparatus is disclosed for supplying a gas stream to a patient, including a ventilator for delivering the gas stream, including an inhalation conduit and a compressible bag or bellows, with the gas stream being in contact with the inner surface of the compressible bag and with its outer surface being in contact with a propellant gas stream so that an increase in pressure in the gas stream within the compressible bag can be created by application of the propellant gas against the outer surface of the bag, and including a manual pump associated with the propellant gas stream so that increased pressure can be created in the propellant gas stream, thus resulting in application of the propellant gas stream against the outer surface of the bag, by actuation of the manual pump, and a resultant increase in the pressure in the gas stream within the bag, in turn resulting in an increased flow of the gas stream through the inhalation conduit to the patient.

Abstract: Anesthesia and/or respirator apparatus is disclosed which includes a moistening and/or gasification chamber. The chamber is constructed such that liquid intended to be gasified or evaporated can be received from a source through a metering valve. In the preferred embodiment, the gasification chamber includes a heatable plate or the like for the heating of the supplied liquid. The apparatus means further includes a microprocessor for measuring the energy which is used for the gasification as a measure of the quantity of liquid supplied. In this regard, if certain defined functions are not fulfilled, an alarm signal is generated.

Abstract: An anesthetic apparatus for administering a gaseous anesthetic comprises a breathing mask which is connected to the inspiration pipe and the expiration pipe of the apparatus and used for connecting the apparatus to the airways of a patient. To prevent harmful gaseous anesthetic from being released to the surroundings when the mask is temporarily lifted from the patient's face during anesthesia in order to check the condition of the patient, the apparatus is provided with a gas suction device which can be connected to the mask through a controllable valve. The gas suction device may be continuously operated or may be started automatically when the valve is opened. A signal emitter for generating control signals and applying these to the valve is arranged on, or in the vicinity of the mask in a manner such that it can either be activated manually by the anesthetist, or is activated automatically when the mask is lifted from the patient's face, at which time it generates a control signal for opening the valve.

Abstract: A device for connecting a respirator or an anesthesia machine to a patient comprises a hose (1) which is flexible along substantially its whole length, and one end (1a) of which is formed in a manner to enable it to be connected, in gas-tight fashion, to an endotracheal tube or the like, and the other end (1b) of which is formed in a manner to enable it to be connected, in gas-tight fashion, to the Y-piece of the respirator or anesthesia machine. Incorporated in the part of the hose (1) located nearest the aforementioned other end (1b) is a flexible heat and moisture exchanger body (2) which fills substantially the whole of the cross-sectional through-flow area of the hose (1) and which is substantially uniformly permeable to a gas flow. The heat and moisture exchanger body (2) advantageously comprises a homogenous felted material impregnated with a hygroscopic substance and an anti-bacteria agent. The hose (1) together with the heat and moisture exchanger body (2) incorporated therein form a disposable unit.

Abstract: For the purpose of measuring the concentration of one or more given components of the breathing gas of a patient there is removed a small part of the breathing gas at a location immediately in front of the mouth of the patient. The withdrawn gas is passed to a measuring instrument sensitive to the component or components of interest through a line which comprises, at least in part, a thin tube of a fluorosulfonyl polymer, and the outer surface of which is in free contact with the ambient air. In this way, the temperature and relative humidity of the breathing gas supplied to the measuring instrument are brought into agreement with the temperature and relative humidity of the ambient air.