Abstract:
Los dispositivos portátiles para la verificacion periodica de la velocidad de flujo expiratorio máximo (PEFR) son conocidos, y utilizan silbatos o lengüetas que son activados por umbral con el fin de regresar la PEFR. Esta invencion proporciona un dispositivo de verificacion periodica de PEFR que incluye una lengüeta (16) activada por umbral, localizada en una salida formada en un cuerpo. El cuerpo comprende las chapas del cuerpo de entrada y salida (12, 14) que son interacoplables una con la otra en una pluralidad de posiciones rotacionales de las chapas una con relacion a la otra. Una abertura de ventilacion (26) se extiende axialmente a lo largo de la longitud de la chapa de salida (14). La chapa de entrada (12) incluye una pieza bucal (18) que se extiende dentro de un oclusor cilíndrico (20), el borde superior (20.1) del cual está espiralmente conformado. Cuando las chapas son intercopladas, el oclusor (20) se extiende dentro de la chapa de salida, para ocluir la ventilacion a un grado mayor o menor, dependiendo de la posicion rotacional de las chapas (12, 14), con lo cual se dirige una proporcion mayor o menor del flujo a través del montaje de lengüeta (16). las chapas de cuerpo (12, 14) que son asegurables una a la otra para ajustar el tamaño de la salida de ventilacion, normalmente de acuerdo con un protocolo de tratamiento predeterminado.
Abstract:
A portable electronic spirometer (2), indicating in real time the state of health of a patient with respiratory problems. The device comprises an air flow sensor (1), a microprocessor control (14) to perform calculations of measured data, data storage, means for calculating the best measured result over a period of time, means for establishing a base figure and for displaying results and indicating the gradient level of measurements compared with previous data stored in the memory, and means to display results (3). Also a method for electronically measuring the exhaled air peak/flow of a patient, which comprises establishing basic comparative parameters of a patient by recording results in the evening and in the morning, calculating the ratio between these, storing these in a memory, and using this data for establishing the condition of a patient by such measurements on a day the patient does not feel well.
Abstract:
The invention concerns flowmeters and, more particularly, such meters for measuring peak expiratory flow or PEF. The PEF meter is provided with means normally effective to inhibit respiratory flow through the meter, such means being operable in response to attainment of a predetermined pressure to allow the flow. A valve (5) is used, held closed by an electromagnetic latch (6) or mechanical/magnetic latch, opening at the set pressure. A flow transducer (2), such as a hot wire anemometer, measures the flow, which is displayed and/or stored by means (8). From the PEF measured the airway passage resistance can be determined. Further lung characteristics can be determined from the shape of the decay portion (10) of the expiratory flow curve. The meter has clinical application in the monitoring and diagnosis of asthma and other pulmanory diseases.
Abstract:
A portable peak flow meter (10) for monitoring the expiratory flow rate of a user includes an in-line metering unit having a combination cover and handle. The metering unit, which has opposed mouthpiece and exit ends (14, 16), is of generally rectangular construction. A pair of opposed and hinged cover elements (24, 26) are pivotly mounted to the sidewalls of the metering unit, and pivot from a first position in which they embrace and cover the mouthpiece, to a second position perpendicular to the length of the metering unit in which they serve as a handle. The cover elements both maintain the mouthpiece in a sanitary condition when the unit is not in use and allows the unit to be held in a manner where the user's hand is distanced from the meter, thus preventing interference with operation of the unit.
Abstract:
The apparatus provides for the determination of the instantaneous phase in the respiratory cycle, subject's average respiration rate and the provision of ventilatory assistance. A microprocessor (16) receives an airflow signal from a pressure transducer (18) coupled to a port (17) at a mask (11). The microprocessor (16) controls a servo (19), that in turn controls the fan motor (20) and thus the pressure of air delivered by the blower (10). The blower (10) is coupled to a subject's mask (11) by a conduit (12). The invention seeks to address the following goals: while the subject is awake and making substantial efforts the delivered assistance should be closely matched in phase with the subject's efforts; the machine should automatically adjust the degree of assistance to maintain at least a specified minimum ventilation without relying on the integrity of the subject's chemoreflexes; and it should continue to work correctly in the presence of large leaks.
Abstract:
Apparatus (40) for monitoring oro-nasal respiratory flow is disclosed. The apparatus (40) is formed of a curved plate (42) to which is substantially perpendicularly arranged a planar member (44), the plate (42) and the member (44) are connected by a neck portion (46). Mounted in an upstanding fashion from the planar member (44) are two nasal prongs (48, 50). Two PVDF sensors (60) are mounted from, and lie in, the plane of the planar member (44), co-operating with a respective nasal prong (48, 50). A further PVDF sensor (80) in planar form is arranged to be downwardly directed and perpendicular to the planar member (44) so as to be located in the vicinity of the mouth when the apparatus (40) is being worn by a patient. The PVDF sensors (60, 80) deflect respectively under the influence of nasal and oral airflow, and generate electrical charge having a determined relationship with the airflow.
Abstract:
Portable peak expiratory flow rate (PEFR) monitoring devices are known that use whistles or reeds that are theshold-activated in order to register PEFR. This invention provides a PEFR monitoring device including a threshold-activated reed (16) located in an outlet formed in a body. The body comprises inlet and outlet body shells (12, 14) that are interengageable with one another in a plurality of rotational positions of the shells relatively to one another. A vent opening (26) extends axially along the length of the outlet shell (14). The inlet shell (12) includes a mouthpiece (18) that extends into a cylindrical occluder (20), the upper edge (20.1) of which is spirally shaped. When the shells are interengaged, the occluder (20) extends into the outlet shell to occlude the vent to a greater or lesser extend, depending on the rotational position of the shells (12, 14), thereby to direct a greater or lesser proportion of the flow through the reed assembly (16). The body shells (12, 14) that are lockable to one another to set the vent outler size, normally in accordance with a predetermined treatment protocol.
Abstract:
A thermistor airflow sensor assembly (10) for monitoring the breathing of a patient, comprising thin, flexible, resilient layers of film (12, 14) adhesively secured to form a laminate. Copper conductor strips (32) are formed by etching away a copper layer attached to the lower film prior to lamination, with chip thermistors (30) being soldered to the copper conducting strips. The copper conducting strips extend through an enlarged end portion of the assembly for electrical connection to a cable, a bend relief cable, and a plug which can be connected to a monitor for providing visual and/or audio alarm signals when breathing has been interrupted. A separate carrier strip can be mounted on the film layer adapted to be positioned against the face of the patient, whereby the thin flexible assembly can be easily adapted to the facial configuration of the patient.
Abstract:
The invention solves the problem of elimination of rigid dams in the air flow duct and makes the measurement conditions more natural. A pneumotachograph comprises an external tube (1) having a first, bigger diameter, and on the inside thereof at least one internal tube (2) of smaller diameter situated preferably concentrically with the external tube (1). The external tube (1) of bigger diameter is shorter than the latter (1) tube whereas the orifice of the external tube (1) of bigger diameter has a closure (A) between its edge and the internal tube (2) of smaller diameter so that the air flow duct is the internal tube (2) of smaller diameter. At least one measuring orifice (B) is situated within the measuring area comprising the external wall of the tube (2) of smaller diameter, the internal wall of the closure (A) of the tube (1) of bigger diameter, the internal wall of the tube (1) of bigger diameter and the space confined within the mentioned walls.
Abstract:
A pair of nasal prongs (15), suitable for insertion into the lower portion of the nares, join together via a small plenum chamber (16) to form a single tube (17) conveying the nasal pressure towards an electrical pressure transducer (19). Another prong (20) is held in proximity with the patient's mouth. A baffle element (25) extends downwards from a location above the open end of the prong (20) to redirect a portion of oral airflow. The oral tube (21) extends towards the electrical pressure transducer (19), and conjoins with the nasal tube (17) at a junction (22) to form a common tube (18) connected to the pressure transducer (19). The relative lengths and/or diameters of the nasal tube (17) and the oral tube (21) are arranged so that the respective pneumatic impedances are different, so that the contributions of respiratory airflow from each of said tubes (17, 21) are substantially equal.