Abstract:
An indicator device (2) which can be attached to a standard oxygen flow meter (16) is disclosed. The indicator device (2) has a rod (4) along which a pointer (10) can be moved and locked into position (14). The pointer (10) can be set at the oxygen flow level prescribed by the physician as indicated by the scale (24) on the oxygen flow meter (16). If the oxygen flow level is changed or if oxygen is discontinued for any period of time, the attendant can then set the oxygen flow to the prescribed level by controlling the valve (26) on the oxygen flow meter so that the float (22), which indicates oxygen flowing liters per minute is positioned opposite the position of the pointer. This prevents erroneous or improper setting of oxygen flow levels to patients after interruption or change of oxygen flow level, which can be dangerous and life threatening.
Abstract:
The invention relates to a method and to apparatus for ascertaining the current function or condition of a lung or the lungs of a living subject (1) chosen for a lung function evaluation, by measuring (3) the nitrogen monoxide content (NO) of the expiration air. The amount of nitrogen monoxide formed in the lung or the lungs during the expiration phase of one or more respiratory cycles and/or the time-distribution of the amount of nitrogen monoxide is compared (5) with the maximal nitrogen monoxide content and/or the time-distribution (6) of the nitrogen monoxide content of the exhalation air delivered by a complete, or unimpaired, lung function of a living subject, wherein a deviation disclosed by the comparison (9, 11) is normally interpreted as an impairment of the lung function.
Abstract:
Process for measuring the hyperinsufflation level of a patient under ventilatory assistance from a machine, the cycle of which comprises: insufflation (1), during which a constant flow of air is introduced into the patient's respiratory tract, a pause (2) during which respiration is blocked, and expiration (3), during which the patient's respiratory tract is exposed to a natural flow of air. The process involves the following stages: measuring the pressure (P) at the opening of the respiratory tract; determining the line segment (AB) corresponding to the substantially linear part of the pressure variation as a function of time during insufflation; determining the value of the pressure (PO) for the point of the line segment (AB) corresponding to the moment (tO) when insufflation commences; measuring the fall in pressure (vP) occurring during the pause; and determining the difference between said pressure value and said fall in pressure.
Abstract:
Method and apparatus for volume measurement and body composition estimation provides an accurate, non-invasive estimation of the body volume and body composition of an object or body such as a human being. The present invention provides a first chamber (2) with a door (9) or closable means of entry through which an object or a subject may enter, along with a second chamber (3) and means (18) to cyclically perturb the volumes of the two chambers in a precisely complementary fashion. The present invention also measures the pressure in each of the chambers, controls in real time the volume perturbation and analyzes the pressure records so as to yield volume and body composition estimations.
Abstract:
The disclosure relates to a dream machine, arranged to awake a sleeper experiencing a dream. In one embodiment a physical condition of the sleeper is monitored by a sensor (11), the sensed physical condition is compared with a predetermined value for the physical condition and when the monitored value of the physical condition reaches the predetermined value an alarm (19) wakes the sleeper. In one form the predetermined value is set manually but in other arrangements said value is calculated in the machine.
Abstract:
A method involving the supply of data (20) to input nodes (24a-e) of a neural network with respect to the breathing function. Alarm conditions of critical events are identified and associated with coordinated images generated at the output of the neural network (29m-q) as the system is trained. In such training, the neural network and associated system are subjected to the alarm condition to produce the desired coordinated image. This coordinated image is correlated with an alarm activating signal and the specific alarm condition to which it is to be identified in connection with future comparisons. During subsequent use in clinical applications, the monitoring system, (23, 50-52, 55-59, 63-68 and 70-71) screens data generated for each breath and compares the corresponding coordinated image with previous images generated during training sessions for alarm conditions to be monitored. Upon occurrence of a similar image, the system signals and alarm (71) and identifies the cause for the critical event.
Abstract:
An electronic lung function analyser has an air flow tube (2) through which a patient inhales or exhales, an air flow transducer (3) associated with the air flow tube for providing an electrical output signal in response to inhaled or exhaled air flow in the tube, an electronic signal processor (11) connected to a display device (6) to provide from the transducer output signals an analogue or digital display representative of selected parameters of the patient's lung function, and a keyboard (9) for the manual input to the processor of data relating to the patient. The processor (11) is programmed to compute from the input data predicted normal patient (PNP) values appropriate to the said lung function parameters for display selectively on the display device.
Abstract:
Means intended for measuring the peak flow of a person's exhalation. The means comprises a frame structure (11, 12) which is provided with a mouthpiece part. Inside the frame structure (11, 12), a flap means (14) is disposed, and a pointer means (15). The spring means (16) of the flap means (14) has been disposed in a hollow space (22) in the lower part of the flap means (14), where the spring means (16) is not in contact with the exhaled air. The frame structure (11, 12) comprises a frame part (11) and a transparent cover part (12), whereby the hygienic conditions of the interior of the means can be observed without need to open the means.
Abstract:
An improved inductive reactance to frequency converter circuit (10) for producing an output signal whose frequency is capable of variation in response to a variable input inductance or inductive reactance (30) comprises differential gain means (42) and an improved resonant circuit (20) whose resonance frequency determines the frequency of the output signal. The improved resonant circuit (20) comprises a capacitance element (60, 62) and a transformer (64) whose primary coil (70) is capable of being connected to the variable inductive input reactance (30) and whose secondary coil (68) is connected in parallel with the capacitive element (60, 62) for enabling relatively small changes in the variable input inductive reactance (30) to be measured as relatively large changes in the resonance frequency of the resonant circuit (20).
Abstract:
Determination of the volume of solid bodies by plethysmometry: the bodies, such as human beings or animals, are brought into a measuring chamber (1) the volume of which is changed by means of a piston (8) within a cylinder (7). The change in pressure within the chamber (1) is measured and constitutes a measure of the volume of the body to be determined. The measurement may be performed with the aid of a reference chamber (5) in which the volume is also changed, i.e. by simultaneous movement of a piston (11) within a cylinder (10) together with piston (8) within cylinder (7). By comparison of pressures (by means of 17) between the chambers (1 and 5) a more accurate volume measurement is obtained than without reference chamber (5). The invention is based on the recognition that a quick change in volume is conducive also to a change in temperature and that living beings to be measured give off water vapour and heat, thus causing the measurement to be less accurate, and that this problem may be solved by filling the measuring chamber (1) and preferably also the reference chamber (5) for the major part thereof with a solid filler material (2, 6) having a plurality of interconnected cavities.