Abstract:
A method and system for testing and recording the peak expiratory flow rate (PEFR), forced expiratory volume (FEV.1) and forced volume capacity (FVC) of a patient, comprises prompting the patient to cause the sensing of the expiratory flow rate, sensing the expiratory flow rate of the patient and generating a signal representative of this biological condition, processing the signal to generate biological data representative of the biological condition, generating time data representative of the time when the biological condition was sensed, storing the biological data and the time data, and retrieving the stored biological data together with the time data.
Abstract:
The present invention provides a peak flow meter which facilitates a subject's compliance with the use thereof. In one embodiment, the peak flow meter provides an alarm (58) for indicating that the subject is due for a peak expiratory flow rate evaluation when the subject has failed to use the peak flow meter after a predetermined period of time. In another embodiment, the peak flow meter is provided with circuitry (40) which derives a data result corresponding to the peak expiratory flow rate of air blown into the peak flow meter for a number of blows. A first comparator (50) determines the best data result within the number of blows and a memory (48) stores each best data result. A second comparator (54) compares each best data result to a specified value and provides an enabling signal to an alarm (58) when a best data result is a predetermined amount lower than the specified value.
Abstract:
A method, a device and a sensor to sense the breathing of a man or an animal. A breathing sensor which in an optical way detects changes in deposited moisture on a sensor portion is placed in the breathing air flow and changes of transmitted or reflected optical signal dependent on the deposited moisture is sensed as a measure of the breathing. A sensor according to the invention may consist of an optical fibre, one end surface of which constitutes a sensor surface and reflects a signal in the fibre to a varying degree dependent on mist deposited by the breathing air flow on the sensor surface.
Abstract:
A visual and auditory biofeedback system to instruct patients in proper techniques of inhalation to correctly administer aerosol drugs with Metered Dose Inhaler (MDI) (1 and 2) devices. The system displays desired respiratory parameters of correct expiration lung volume (8 and 9) along with real time inspiration performance (10) with computer (6) related technology means. Optimal performance parameters suited to individual patient needs may be generated. Suitable respiratory flow transducer means (5) is used to generate integrated air volume signals in real time, and suitable electronic switching means (7) is used to indicate MDI activation in real time. The system thus provides visual and auditory biofeedback incentives to improve patient or student performance to mechanical prescription parameters defined by the physician or instructor. Visual and auditory performance deficiency defined limits and performance enhancement indicators may be optionally used, both to enhance and to quality control performance.
Abstract:
The arterial CO2 monitor and closed loop controller for use with a ventilator monitors a patient's breath and determines PaCO2 based upon a determination of a deadspace ratio, which is the ratio of the alveolar deadspace to alveolar tidal volume. The method generally comprises the steps of continuously monitoring measurable parameters of a patient's breath; obtaining an input value of PaCO2 from a blood sample of the patient and using the patient's breath parameters and the input value to calculate the deadspace ratio; and continuously determining PaCO2 based on the assumption that the deadspace ratio subsequently remains constant. Decision rules obtained from other measurable data are preferably also used to identify the onset of changes in the deadspace ratio, and a new deadspace ratio is then determined from the patient's breath parameters and further input value of PaCO2 from the patient's blood sample.
Abstract:
A patient is disposed within a scan circle or examination region (62) of a CT scanner (B). As the patient starts breathing air from a xenon gas supply means (A), a flow image and a lambda image are created and stored in a flow image memory (90) and a lambda image memory (92). The flow and lambda images, as well as a standard CT image, are displayed in quadrants of a video monitor (102). A joystick (106) enables the operator to designate a region of interest on the displayed image representations. Corresponding flow and lambda values are retrieved from the flow and lambda image memories for each spatial location or pixel within the region of interest. The flow and lambda values are loaded into a flow vs. lambda image memory (112) which is addressed in one direction by the flow values and in another by the lambda values to create a count of the flow and lambda value pairs. The information in the flow vs. lambda image memory is displayed as a histogram in one quadrant of the video display. The joystick further enables the operator to designate a section of the histogram as white matter and another portion as grey matter. A statistical analysis circuit (122) analyses the designated white matter and grey matter data to determine average flow and lambda values for each. These average flow and lambda values are displayed numerically with appropriate headings on the video display monitor.
Abstract:
A monitoring unit (9) and a method for monitoring the lung and/or bronchial tract conditions of a patient, wherein patient data pertaining to a particular patient is stored in a patient data storage means (5), whereby, upon reception of an inhaled or exhaled breath of a patient via a mouthpiece (1) onto a transducer means (12), the data therefor is processed (4) to calculate the lung and/or bronchial tract condition of a patient and compared to the patient data, such that the condition of a patient may be displayed to an operator via display means (15, 16). The unit may be embodied as a personal spirometer unit (9) or as a composite master system with a plurality of personal spirometer units wherein a plurality of discrete data information is stored and may be transferred to the master system by suitable interface means for further processing.
Abstract:
Described herein is a patient interfacing (10) for sampling the inspired and expired gases of a patient and removing moisture from the sample. In one embodiment of the present invention, a patient link (20) receives the gases from the patient's airway circuit (11) and a vaporization section (30) vaporizes condensed moisture in the sample. A separator section (40) allows the vaporized moisture component of the sample to exit the patient interfacing system (10) before the gas sample reaches the monitoring instrument (12). A filter (70) may also be utilized to prevent condensed moisture, particulates and liquids from entering the monitoring instrument (12). Thus, the patient interfacing system (10) of the present invention provides a reliable, cost effective and efficient means for delivering gas samples to a monitoring instrument (12) which reduces or prevents water condensation inside the gas analysis portion of the monitoring instrument (12).
Abstract:
Apparatus for respiratory training comprising a mouth piece (1), a respiration chamber co-acting with the mouth piece (1), said respiration chamber having an inspiratory opening comprising a check valve and an expiratory opening comprising a check valve, exchangeable covers for varying the resistance to the air flow through the inspiratory and expiratory openings, and a branch-off stub (3) extending from the mouth piece (1) which branch-off stub may be connected through a flexible tube (18) to one top end of a manometer (20) in the form of a substantially vertically suspended liquid containing U-shaped tube (21, 22), the other end of the U-shaped tube being in communication with the open.
Abstract:
An apparatus and method for measuring variables associated with the ventilation of infants during assisted ventilation. The infant is placed in a plethysmograph (10) and various sensor means (33-36, 40, 50) are used to measure flow of gas into and out of the plethysmograph (10) and infant respiration. The outputs of the sensor means (33-36, 40, 50) are supplied to a minicomputer system (130) for processing. From this data, ventilator breaths are discriminated from infant breaths.