Abstract:
This is an apparatus for accurately and reliably measuring fluid flow under turbulent or pulsating conditions with high signal to noise ratio and using a symmetrical design which works with flow in either direction. The apparatus is particularly well suited for measuring airflow in a bi-level respiratory system. The apparatus includes a flow conduit (34), an upstream sense tube (36) protruding into the flow conduit (34) with a notch opening (38) facing into the flow stream, a downstream sense tube (40) protruding into the flow conduit (34) with a notch opening (42) facing away from the flow stream, and a flow or pressure sensor/transducer (44) disposed in connecting lines (46, 48) between the upstream and downstream sense tubes (36, 40). The notched opening (38, 42) has a square, semi-cylindrical shape. The flow conduit (34) is either straight or angled.
Abstract:
An interactive respiratory regulator comprising a recording device recording the respiratory pattern of a user and issuing a corresponding respiratory signal, an instruction signal generator for the generation of an instruction signal that can be perceived by the user in order to influence his respiratory behaviour, a control device controlling the instruction signal generator, a processing device which determines by means of a parameter of the respiratory signal received, whether the recorded respiratory pattern during a predetermined time span meets a preadjustable standard for this parameter, and which at a certain error percentage sends a starting signal to the control device. The interactive respiratory regulator is characterized in that the processing device processes as parameter the ratio between the in- and exhalation time in a respiratory cycle. In a preferred embodiment the processing device includes the frequency of the respiratory cycles as second parmeter and the preadjustable standard comprises also a value for this parameter. The interactive respiratory regulator offers a useful feed back to the user with respiration regularity disorders. In principle the apparatus can be used for every deficient respiratory pattern, among others by people who suffer from hyperventilation or who are susceptible to stress.
Abstract:
Apparatus provides an output signal characteristic of the geometry of a confined volume. There is a conduit (44) with an open first end for exchanging acoustical energy with the confined volume. An electroacoustical transducer (42) is coupled to the conduit for launching acoustical energy into the conduit towards the opening in the confined volume producing an incident wave and a reflected wave to form a transient wave field representative of the geometry of the confined volume. At least first and second pressure-wave-sensing transducers (46, 48) are mounted along the length of the conduit in spaced relationship for providing first and second transduced signals representative of the transient wave field at spaced locations in the conduit. A processor processes the first and second transduced signals to provide an output signal characteristic of the geometry of the confined volume.
Abstract:
A method and device for controlling sleep disorder breathing utilizes variable pressure. The compressor (15) supplies air at a relatively low pressure to the user's air passages while the user is asleep. A pressure transducer (17) will monitor the pressure and convert the pressure into an electrical signal. The electrical signal is filtered and processed to compare it to the characteristics of waveforms that exists during snoring. If the envelope of the waveform exceeds an average threshold value in duration and in area, then the microprocessor (23) will consider the envelope possibly associated with a snore. If a selected number of envelopes of this nature occur within a selected time period, then the microprocessor considers snoring to exist and increases the pressure of the compressor. If snoring is not detected within a certain time period, then the microprocessor (23) lowers the level gradually.
Abstract:
A disposable endotracheal airway adapter (10) for use in proximity of a patient's mouth in the measurement of the concentration of respiratory gases. The disposable airway adapter of the invention provides a conduit for patient respiratory gases and allows the passage of infrared radiation through the gases for measuring the constituent concentration of the gases while keeping the patient gases from coming in contact with the analyzer mechanism. The body (40) of the airway adapter (10) is designed to connect in series with the airway tubing which connects a patient to a mechanical respirator or anesthesia breathing circuit. The body (40) of the airway adapter (10) is very light in weight and is formed of inexpensive material such as polyethylene or polypropylene so that it may be manufactured inexpensively and discarded after each use.
Abstract:
A nasal cannulae and a method is described for insufflating a treating gas into one nostril of an unintubated, conscious, spontaneously breathing patient having local or regional anesthesia administered thereto or recovering from residual general anesthesia while accurately and reliably measuring at least one gaseous component of exhaled breath in the other nostril enabling adaption of treatment to the state of the body functions of the patient. The cannulae (10, 10', 40) includes a hollow body (12, 12', 43) divided by a wall member (18, 18', 52) into inhalation (20, 44) and exhalation (22, 54) manifolds which are connected to an oxygen flow regulating device (24) and breathing gas analyzer (26), respectively. Hollow nasal prongs of same (14, 16, 46) or different lengths (14', 15') and adapted to be received in corresponding nostrils communicate with the manifolds (20, 44, 22, 54), respectively. The wall member may be integrally molded (18) with the body (12) or a conventional cannulae may be modified by insertion of a wall member (48', 52).
Abstract:
A device for supervision of the respiration of infants is based on the principle that the breathing sounds are detected by means of a signal microphone (10) adapted on the infant's throat. In order to eliminate the influence of disturbing surrounding sounds a reference microphone (12) is positioned on the infant so that it picks up substantially the same disturbing sounds as the signal microphone (10) but substantially no breathing sounds. By subtraction of the reference microphone signal from the output signal or the signal microphone, e.g. in a differential amplifier (30), an output signal indicating the respiration and substantially independent of disturbing sounds is formed which can be made to sound the alarm via suitable signal treatment circuits (32, 34) when the breathing sounds have ceased for a predetermined time.
Abstract:
The breathing regulator generally comprises a breath sensing means to determine whether a user has or has not taken a breath. If a breath has not been taken the breath sensing means sends a signal to a controller which initiates a warning means, which can be timed, that encourages the user to take a breath. The breath sensing means may comprise any number of devices such as a thermocouple, microphone, pulse oximeter, air movement probe, motion probe or carbon dioxide/monoxide detector. The warning means may also come in a number of forms. For instance, a vibrator, electrical shocking device or a sound emanating device may serve as a warning to the user that a breath should be taken.
Abstract:
The present air tube, preferably calibrated air tube, includes resistive element (22) which is located in the hollow space of the tubular portion (12). This resistive element (22) is adapted for providing a linear resistance versus pressure response, and is sized and adapted to cause a pressure difference or differential as air flows in the hollow space across this element. The preferred calibrated air tube has a pressure response, is useful in a spirometer, and includes a tubular member. Calibration information is associated with the air tube to a model pressure response of a model air tube having substantially the same dimensions and configurations as the air tube.
Abstract:
A respiration monitor (15) is disclosed which includes a simplified pneumatic breath detector (17), a pressure sensor (39) connected with the detector, and an active low pass filter (45) for filtering the output of the monitor to reduce signals not indicative of respiration, such as movement of and/or impacts upon the detector. The monitor may be linked with a transmitter (47) for remote subject monitoring, unobtrusively worn by the subject.