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WO2004049940A1 - Portable peak flow meter - Google Patents

Portable peak flow meter Download PDF

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Publication number
WO2004049940A1
WO2004049940A1 PCT/ES2002/000578 ES0200578W WO2004049940A1 WO 2004049940 A1 WO2004049940 A1 WO 2004049940A1 ES 0200578 W ES0200578 W ES 0200578W WO 2004049940 A1 WO2004049940 A1 WO 2004049940A1
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WO
WIPO (PCT)
Prior art keywords
tube
sensor
peak
spirometer
portable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/ES2002/000578
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Spanish (es)
French (fr)
Inventor
Antonio Bote Bote
Justo Crespo Tejero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SERVICIO DE INSTRUMENTACION HOSPITALARIA SL
Original Assignee
SERVICIO DE INSTRUMENTACION HOSPITALARIA SL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to ES200102319A priority Critical patent/ES2188405B1/en
Priority claimed from ES200102319A external-priority patent/ES2188405B1/en
Application filed by SERVICIO DE INSTRUMENTACION HOSPITALARIA SL filed Critical SERVICIO DE INSTRUMENTACION HOSPITALARIA SL
Priority to PCT/ES2002/000578 priority patent/WO2004049940A1/en
Priority to AU2002358822A priority patent/AU2002358822A1/en
Publication of WO2004049940A1 publication Critical patent/WO2004049940A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A61B5/0871—Peak expiratory flowmeters

Definitions

  • the present invention relates to a portable peak or peak spirometer
  • Flow Meter designed to measure the maximum expired flow, also known by its initials in English PEF (Peak espiratory Flow), based on the combination of a Pitot tube and a Venturi tube, whose pressure difference is collected and analyzed by a microprocessor that shows it on a display.
  • PEF Pulak espiratory Flow
  • This invention has application in the field of medicine.
  • Spirometry is the measurement of air flows during breathing. These measures are essential for the diagnosis and control of various diseases of the respiratory system, such as asthma, emphysema and COPD (Chronic Pulmonary Obstructive Disease).
  • various parameters are measured such as the total expired volume, the total volume in the first second, and others.
  • PEF or maximum exhaled flow. It consists of the maximum speed at which the air is expelled from the lungs during a forced exhalation. It is usually measured in liters per second or liters per minute. This maximum value is usually reached a few tens of milliseconds after expiration (from 40ms to 200ms), and is maintained for a few milliseconds.
  • spirometers carry out their measurement by one of two types below.
  • One of the types collects the exhaled volume of the subject in bellows or in another container, whose displacement corresponds to the volume of exhaled air. These devices are great by nature to allow you to pick up one . Enough air volume, so you can't easily make laptops.
  • a second type measures the air flow rate through a flow measurement device. The exhaled volume is derived by integrating the airflow regime over some period of time.
  • the portable spiometer, object of the present invention is based on the measurement of the pressure difference between a Venturi tube (negative pressure or depression) and a Pitot tube ( positive pressure) placed in the center of a narrowing of the tube where the user exhales. This double arrangement generates a pressure difference greater than that of any of the elements separately.
  • the Pitot tube is an application of fluid dynamics used to measure velocities, obtaining a pressure at its outlet, called stagnation pressure, proportional to the square of the velocity and the density of the fluid.
  • the Venturi tube is another application of fluid dynamics with which a depression is created when a fluid passes, also proportional to the square of the velocity and the density of the fluid.
  • This pressure difference is injected into a differential pressure sensor., .- which generates a voltage!, Which feeds an analog / digital converter, and a microprocessor, which applies the correct corrections to ensure accuracy and linearity required.
  • the value of the measure is presented on an alphanumeric screen, stored and transmitted by electronic procedures. This screen also presents messages to the user for easy handling.
  • Figure 1 Schematic sectional view of an application tube to the spirometer object of the present invention.
  • the tube (1) is distinguished in the first place where the patient is exhaling; in its final part there is a narrowing (5) where a sensor head (2) has been placed with the two pressure taps: the one corresponding to the Pitot tube (3) in the direction of the flow, and that corresponding to the depression caused in the Venturi tube (4), in the sense.perpe.ndjcu.lar to the flow ..
  • the tube is simple and cheap to make, it can be discarded at a low cost or be disinfected.
  • the sensing head (2) can be cleaned externally without the risk of clogging the holes due to their small size and because they are sealed at its other end.
  • the sensor head (2) is integral with the tube (1), where the holes communicate with the sensor through two holes provided with joints and membranes. With this arrangement all parts that may be contaminated by a patient can be completely discarded or disinfected.
  • the tube (1) is fixed to the body of the spirometer thanks to a groove that carries on one side of the same diameter as the tube.
  • the measurements of the tube (1) and the sensor head (2) are adequate to obtain a sufficient pressure difference to comply with international recommendations on this type of equipment, and so that the pressure loss in the apparatus is as low as possible.
  • Another of the innovations present in this device is the transmission of the measurements made and stored, through various electronic procedures. In this way, the doctor can receive the information quickly, and act accordingly.
  • this stored data can be requested and displayed on the screen (8), being able to create historical, graphical, average, etc., depending on the program inserted in the microprocessor (6).
  • this data and applications can be exported by an RS-232 data transmission module (9).
  • the device In order to be easily transported by the user, the device is highly portable, thanks to the possibility of the materials and technology used, of a size and weight similar to that of a tobacco package, and powered by standard batteries ( 10), easily obtainable in commerce.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Pulmonology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Physiology (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The invention relates to a portable peak flow meter. The invention consists of a sensor (2) which is positioned in the necking (5) of a suction pipe (1), said sensor comprising a Pitot tube (3) and a Venturi tube (4), and which can measure the peak expiratory flow (PEF) in accordance with international recommendations. The result of the measurements are displayed on an alphanumeric screen (8) together with instructions suitable for the user. The invention also comprises a memory element (7) in which the aforementioned results are stored, a microprocessor (6) which processes said results and data transmission means (9).

Description

ESPIRÓMETRO PORTÁTIL DE PICO PICO PORTABLE SPIROMETER

Objeto de la invenciónObject of the invention

La presente invención se refiere a un espirómetro portátil de pico o PeakThe present invention relates to a portable peak or peak spirometer

Flow Meter, diseñado para medir el flujo máximo espirado, también conocido por sus iniciales en inglés PEF (Peak espiratory Flow), basado en la combinación de un tubo de Pitot y un tubo de Venturi, cuya diferencia de presiones es recogida y analizada por un microprocesador que lo muestra en un display.Flow Meter, designed to measure the maximum expired flow, also known by its initials in English PEF (Peak espiratory Flow), based on the combination of a Pitot tube and a Venturi tube, whose pressure difference is collected and analyzed by a microprocessor that shows it on a display.

Esta invención tiene aplicación en el campo de la medicina.This invention has application in the field of medicine.

Antecedentes de la invenciónBackground of the invention

La espirometría es la medición de los flujos de aire durante la respiración. Estas medidas son fundamentales para el diagnóstico y control de diversas enfermedades del aparato respiratorio, como el asma, el enfisema y la EPOC (Enfermedad Obstructiva Pulmonar Crónica). En una espirometría completa se miden diversos parámetros como el volumen total espirado, el volumen total en el primer segundo, y otros. Uno de los parámetros más importantes medidos en una espirometría es el antes indicado PEF, o flujo máximo espirado. Consiste en la máxima velocidad a la que el aire es expulsado de los pulmones durante una exhalación forzada. Usualmente se mide en litros por segundo o litros por minuto. Este valor máximo se suele alcanzar algunas decenas de milisegundos después de iniciada la espiración (de 40ms a 200ms), y se mantiene durante pocos milisegundos.Spirometry is the measurement of air flows during breathing. These measures are essential for the diagnosis and control of various diseases of the respiratory system, such as asthma, emphysema and COPD (Chronic Pulmonary Obstructive Disease). In a complete spirometry, various parameters are measured such as the total expired volume, the total volume in the first second, and others. One of the most important parameters measured in a spirometry is the aforementioned PEF, or maximum exhaled flow. It consists of the maximum speed at which the air is expelled from the lungs during a forced exhalation. It is usually measured in liters per second or liters per minute. This maximum value is usually reached a few tens of milliseconds after expiration (from 40ms to 200ms), and is maintained for a few milliseconds.

Por ejemplo, lo efectos de distintas medicinas utilizadas para tratar pacientes con los mencionados problemas pueden ser analizados mejor mediante el control del volumen y el régimen de flujo de aire espirado a intervalos regulares, antes y después de la administración de una medicación. En general, los espirómetros llevan a cabo su medida mediante uno de dos tipos siguientes. Uno de los tipos recoge el volumen espirado del sujeto en unos fuelles o en otro contenedor, cuyo desplazamiento corresponde al volumen del aire espirado. Estos dispositivos son grandes por naturaleza para per itid recoger un. volumen de aire suficiente, por lo que no se pueden hacer fácilmente portátiles. Un segundo tipo mide el régimen de flujo de aire a través de un dispositivo de medida del flujo. El volumen espirado se deriva mediante la integración del régimen del flujo de aire a través de algún periodo de tiempo.For example, the effects of different medicines used to treat patients with the aforementioned problems can be better analyzed by controlling the volume and the expired air flow regime at regular intervals, before and after the administration of a medication. In general, spirometers carry out their measurement by one of two types below. One of the types collects the exhaled volume of the subject in bellows or in another container, whose displacement corresponds to the volume of exhaled air. These devices are great by nature to allow you to pick up one . Enough air volume, so you can't easily make laptops. A second type measures the air flow rate through a flow measurement device. The exhaled volume is derived by integrating the airflow regime over some period of time.

Como se puede deducir de lo antes expuesto, para realizar la medida del PEF usualmente se utilizan equipos mecánicos con hélices, muelles, pesos u otros elementos mecánicos móviles. Estas partes móviles han de ser muy ligeras para poder moverse rápidamente y medir con precisión el valor exacto, y a la vez robustas para soportar la fuerza de la espiración sin deformarse, lo que implica que sean de alto coste de fabricación, y de delicado mantenimiento. Por otro lado los resultados de la medida de estos aparatos no pueden ser almacenadas ni transmitidas sino es manualmente. Por último, la limpieza y desinfección es complicada, sino imposible, implicando nuevos ajustes y calibraciones; uno de estos ejemplos se muestra en el documento US-A-3797479, o el que se describe en el documento US-A-4598700.As can be deduced from the foregoing, mechanical equipment with propellers, springs, weights or other mobile mechanical elements is usually used to measure the PEF. These moving parts have to be very light to be able to move quickly and accurately measure the exact value, and at the same time robust to withstand the force of exhalation without deforming, which implies that they are of high manufacturing cost, and of delicate maintenance. On the other hand, the measurement results of these devices cannot be stored or transmitted unless it is manually. Finally, cleaning and disinfection is complicated, if not impossible, involving new adjustments and calibrations; One of these examples is shown in US-A-3797479, or that described in US-A-4598700.

Descripción de la invenciónDescription of the invention

Con el fin de evitar o paliar todos estos problemas, el espirómetro portátil de pico, objeto de la presente invención, está basado en la medición de la diferencia de presión entre un tubo de Venturi (presión negativa o depresión) y un tubo de Pitot (presión positiva) colocados en el centro de un estrechamiento del tubo por donde el usuario efectúa la espiración. Esta disposición doble genera una diferencia de presiones superior a la de cualquiera de los elementos por separado.In order to avoid or alleviate all these problems, the portable spiometer, object of the present invention, is based on the measurement of the pressure difference between a Venturi tube (negative pressure or depression) and a Pitot tube ( positive pressure) placed in the center of a narrowing of the tube where the user exhales. This double arrangement generates a pressure difference greater than that of any of the elements separately.

Es sabido que el tubo de Pitot es una aplicación de la dinámica de fluidos utilizada para medir velocidades, obteniéndose una presión en su salida, llamada presión de estancamiento, proporcional al cuadrado de la velocidad y a la densidad del fluido. Por otro lado, el tubo de Venturi es otra aplicación de la dinámica de fluidos con la que se crea una depresión al paso de un fluido, proporcional también al cuadrado de la velocidad y a la densidad del fluido. Esta diferencia de presiones es inyectada en un sensor de presión difer-erιcial.,.-que.genera .una tensión proporciona!, que alimenta a un conversor analógico/digital, y a un microprocesador, que aplica las correcciones adecuadas para garantizar la precisión y linealidad exigidas. El valor de la medida es presentado en una pantalla alfanumérica, almacenado y transmitido por procedimientos electrónicos. Esta pantalla también presenta mensajes al usuario para facilitar su manejo.It is known that the Pitot tube is an application of fluid dynamics used to measure velocities, obtaining a pressure at its outlet, called stagnation pressure, proportional to the square of the velocity and the density of the fluid. On the other hand, the Venturi tube is another application of fluid dynamics with which a depression is created when a fluid passes, also proportional to the square of the velocity and the density of the fluid. This pressure difference is injected into a differential pressure sensor., .- which generates a voltage!, Which feeds an analog / digital converter, and a microprocessor, which applies the correct corrections to ensure accuracy and linearity required. The value of the measure is presented on an alphanumeric screen, stored and transmitted by electronic procedures. This screen also presents messages to the user for easy handling.

Por lo tanto, lo que se consigue con la presente invención es un espirómetro de reducido volumen y coste, ya que la electrónica que porta es muy usual. La posibilidad de esta importante reducción de volumen y coste implica por un lado, la movilidad de estos medios y materiales, es decir, el propio usuario puede disponer de uno en su lugar habitual para un determinado control, y por otro lado, es de más fácil aplicación a mayor número de casos, siendo también más fácil de llegar al usuario final.Therefore, what is achieved with the present invention is a spirometer of reduced volume and cost, since the electronics it carries are very common. The possibility of this significant reduction in volume and cost implies, on the one hand, the mobility of these means and materials, that is, the user himself can have one in his usual place for a certain control, and on the other hand, it is more Easy application to a greater number of cases, being also easier to reach the end user.

Descripción de los dibujosDescription of the drawings

Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, se acompaña a la presente memoria descriptiva, como parte integrante de la misma, una serie de figuras en las cuales con carácter ilustrativo y no limitativo, se ha representado lo siguiente:To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, a series of figures are attached as an integral part thereof, illustrative and not limiting, the following has been represented:

Figura 1.- Vista esquemática en sección de un tubo de aplicación al espirómetro objeto de la presente invención.Figure 1.- Schematic sectional view of an application tube to the spirometer object of the present invention.

Figura 2.- Diagrama de bloques del espirómetro.Figure 2.- Block diagram of the spirometer.

Realización preferente de la invenciónPreferred Embodiment of the Invention

Como se puede apreciar en las figuras adjuntas, se distingue en primer lugar el tubo (1) es por donde el paciente efectúa la espiración; en su parte final existe un estrechamiento (5) donde se ha colocado una cabeza sensora (2) con las dos tomas de presión: la correspondiente al tubo de Pitot (3) en el sentido del flujo, y la correspondiente a la depresión causada en el tubo de Venturi (4), en el s.entido.perpe.ndjcu.lar al flujo..As can be seen in the attached figures, the tube (1) is distinguished in the first place where the patient is exhaling; in its final part there is a narrowing (5) where a sensor head (2) has been placed with the two pressure taps: the one corresponding to the Pitot tube (3) in the direction of the flow, and that corresponding to the depression caused in the Venturi tube (4), in the sense.perpe.ndjcu.lar to the flow ..

Se han planteado dos formas de ensamblar las piezas:Two ways of assembling the pieces have been considered:

* La cabeza sensora (2) solidaria con el cuerpo del espirómetro, siendo el tubo (1) extraíble. El tubo es de fabricación sencilla y barata, puede desecharse con un coste bajo o ser desinfectado. La cabeza sensora (2) puede ser limpiada externamente sin riesgo de obstruir los orificios debido a su pequeño tamaño y a que están obturados por su otro extremo.* The sensor head (2) integral with the spirometer body, the tube (1) being removable. The tube is simple and cheap to make, it can be discarded at a low cost or be disinfected. The sensing head (2) can be cleaned externally without the risk of clogging the holes due to their small size and because they are sealed at its other end.

* La cabeza sensora (2) es solidaria con el tubo (1), donde los orificios se comunican con el sensor a través de sendos orificios dotados de juntas y membranas. Con esta disposición todas las partes que puedan quedar contaminadas por un paciente pueden desecharse o desinfectarse completamente.* The sensor head (2) is integral with the tube (1), where the holes communicate with the sensor through two holes provided with joints and membranes. With this arrangement all parts that may be contaminated by a patient can be completely discarded or disinfected.

En ambos casos, el tubo (1) se fija al cuerpo del espirómetro gracias a una acanaladura que porta en un lateral del mismo diámetro que el tubo.In both cases, the tube (1) is fixed to the body of the spirometer thanks to a groove that carries on one side of the same diameter as the tube.

Las medidas del tubo (1) y la cabeza sensora (2) son los adecuados para obtener una diferencia de presión suficiente para cumplir las recomendaciones internacionales sobre este tipo de equipos, y para que la pérdida de presión en el aparato sea la mínima posible. Otra de las innovaciones presentes en este aparato es la transmisión de las medidas realizadas y almacenadas, a través de diversos procedimientos electrónicos. De esta manera, el médico puede recibir la información rápidamente, y actuar en consecuencia.The measurements of the tube (1) and the sensor head (2) are adequate to obtain a sufficient pressure difference to comply with international recommendations on this type of equipment, and so that the pressure loss in the apparatus is as low as possible. Another of the innovations present in this device is the transmission of the measurements made and stored, through various electronic procedures. In this way, the doctor can receive the information quickly, and act accordingly.

Su aplicación y funcionamiento es bien sencillo, para ello, una vez acoplado el tubo (1) en el espirómetro, el paciente en su espiración genera un flujo de fluido a una velocidad y fuerza determinadas. Cuando este flujo pasa por la abertura del tubo de Pitot (3), se genera una presión que queda medida por éste; al mismo tiempo este flujo también provoca por el estrangulamiento (5), un aumento de velocidad y una depresión en el tubo de Venturi (4), el cual también recoge. la medida de . esta^presión negativa.Its application and operation is very simple, for this, once the tube (1) is attached to the spirometer, the patient in his exhalation generates a fluid flow at a certain speed and force. When this flow passes through the opening of the Pitot tube (3), a pressure is generated that is measured by it; at the same time this flow also causes strangulation (5), a speed increase and a depression in the Venturi tube (4), which also picks up. the measure of . This ^ negative pressure.

Ambas medidas tomadas, la presión positiva de Pitot y la presión negativa de Venturi, son capturadas por el sensor de presión diferencial (2), el cual a través de un transductor se genera una tensión proporcional a esta diferencia de presiones. La señal es convertida de analógica a digital en un conversor y de aquí pasa a un microprocesador (6), que aplica las correcciones adecuadas, de acuerdo a un programa y parámetros determinados, que garantice la precisión y linealidad exigidas.Both measures taken, the positive pressure of Pitot and the negative pressure of Venturi, are captured by the differential pressure sensor (2), which through a transducer generates a voltage proportional to this pressure difference. The signal is converted from analog to digital in a converter and from here it passes to a microprocessor (6), which applies the appropriate corrections, according to a specific program and parameters, which guarantees the required accuracy and linearity.

Estos valores son almacenados en una memoria (7) y mostrados mediante un display (8) o pantalla alfanumérica al usuario. De manera que, gracias a un pequeño teclado (9), estos datos almacenados pueden ser solicitados y mostrados en la pantalla (8), pudiendo crear históricos, gráficas, medias, etc., dependiendo del programa inserto en el microprocesador (6). Así mismo, estos datos y aplicaciones se pueden exportar por un módulo de transmisión de datos RS-232 (9).These values are stored in a memory (7) and displayed by means of a display (8) or alphanumeric display to the user. So, thanks to a small keyboard (9), this stored data can be requested and displayed on the screen (8), being able to create historical, graphical, average, etc., depending on the program inserted in the microprocessor (6). Likewise, this data and applications can be exported by an RS-232 data transmission module (9).

A fin de que pueda ser transportado fácilmente por el usuario, el aparato es altamente portátil, gracias a la posibilidad de los materiales y tecnología empleados, de un tamaño y peso similar al de un paquete de tabaco, y alimentado por pilas o baterías estándares (10), fácilmente obtenible en el comercio.In order to be easily transported by the user, the device is highly portable, thanks to the possibility of the materials and technology used, of a size and weight similar to that of a tobacco package, and powered by standard batteries ( 10), easily obtainable in commerce.

Una vez descrita suficientemente la naturaleza del presente invento, así como una forma de llevarlo a la práctica, sólo nos queda por añadir que en su conjunto y partes que lo componen es posible introducir cambios de forma, materiales y de disposición, siempre y cuando dichas alteraciones no varíen substancialmente las características del invento que se reivindican a continuación : Once the nature of the present invention has been sufficiently described, as well as a way of putting it into practice, we only have to add that as a whole and its component parts it is possible to introduce changes in form, materials and arrangement, as long as these Alterations do not substantially vary the characteristics of the invention claimed below:

Claims

REIVINDICACIONES 1- Espirómetro portátil de pico, para medir el flujo máximo espirado, también conocido por sus iniciales en inglés PEF Peak Flow Meter portátil, caracterizado porque, se utiliza como principio de medida una combinación de tubos de Venturi y de Pitot colocados en el tubo (1) que es por donde el paciente efectúa la espiración; en su parte final existe un estrechamiento (5) donde se ha colocado una cabeza sensora (2) con las dos tomas de presión: la correspondiente al tubo de Pitot (3) en el sentido del flujo, y la correspondiente a la depresión causada en el tubo de Venturi (4), en el sentido perpendicular al flujo; esta diferencia de presión es medida por el sensor de presión electrónico (2) y procesado por un microprocesador (6) el cual dispone de una memoria de almacenamiento de datos tomados (7) y un módulo de transmisión de estos datos RS-232, todo el dispositivo alimentado por una batería (10), estando los dos tubos sensores (3 y 4) uno detrás de otro en el sentido del flujo de aire espirado en el estrechamiento del tubo (1) ya que aquí se aumenta la velocidad del aire, causando una caída de presión pequeña.1- Portable peak spirometer, to measure the maximum expired flow, also known by its initials in English PEF Peak Flow Meter, characterized in that a combination of Venturi and Pitot tubes placed in the tube is used as the measuring principle ( 1) that is where the patient exhales; in its final part there is a narrowing (5) where a sensor head (2) has been placed with the two pressure taps: the one corresponding to the Pitot tube (3) in the direction of the flow, and the one corresponding to the depression caused in the Venturi tube (4), in the direction perpendicular to the flow; This pressure difference is measured by the electronic pressure sensor (2) and processed by a microprocessor (6) which has a data storage memory taken (7) and a transmission module of this RS-232 data, all the device powered by a battery (10), the two sensor tubes (3 and 4) being one behind the other in the direction of the exhaled air flow in the narrowing of the tube (1) since here the air velocity is increased, causing a small pressure drop. 2.- Espirómetro portátil de pico, según reivindicación primera, caracterizado porque, porta un transductor que genera una tensión, o señal eléctrica, proporcional a la diferencias de las presiones medidas por los respectivos tubos (3 y 4) y capturadas por el sensor de presión diferencial (2).2.- Portable peak spirometer, according to claim one, characterized in that it carries a transducer that generates a voltage, or electrical signal, proportional to the differences in the pressures measured by the respective tubes (3 and 4) and captured by the sensor. differential pressure (2). 3.- Espirómetro portátil de pico, según reivindicación anterior, caracterizado porque, está dotado de un conversor analógico digital que convierte la señal eléctrica generada por el transductor de analógica a digital pasando a un microprocesador (6), que aplica las correcciones adecuadas, de acuerdo a un programa y parámetros determinados, que garantice la precisión y linealidad exigidas.3.- Portable peak spirometer, according to the preceding claim, characterized in that it is equipped with a digital analog converter that converts the electrical signal generated by the analog to digital transducer by passing to a microprocessor (6), which applies the appropriate corrections, of according to a specific program and parameters, which guarantees the precision and linearity required. 4.- Espirómetro portátil de pico, según reivindicación anterior, caracterizado porque, dispone de un teclado (9) de utilización por el usuario así como un display o pantalla alfanumérica (8) donde se muestran los datos obtenidos de la medición como los almacenados en la memoria (7). 4.- Portable peak spirometer, according to the preceding claim, characterized in that it has a keyboard (9) for use by the user as well as an alphanumeric display or screen (8) where the data obtained from the measurement are displayed as those stored in the memory (7). 5.- Espirómetro_ portátil de_ pico según^ reivindicación primera, caracterizado porque el tubo (1) es extraíble por simple presión, mientras que la cabeza sensora (2) es solidaria con el cuerpo del aparato.5. Espirómetro_ portable de_ peak according to claim ^ characterized in that the tube (1) is removable by simple pressure, while the sensor head (2) is integral with the body of the apparatus. 6.- Espirómetro portátil de pico según reivindicación primera, caracterizado porque el tubo (1) es solidario con la cabeza sensora (2), siendo el conjunto extraíble por simple presión del cuerpo del aparato, donde las presiones tomadas por lo tubos (3, 4) son comunicadas al sensor (2) a través de unos orificios dotados de juntas y membranas, que aislan completamente al sensor del tubo por el que el usuario efectúa la espiración.6. Portable peak spirometer according to claim one, characterized in that the tube (1) is integral with the sensor head (2), the assembly being removable by simple pressure from the body of the apparatus, where the pressures taken by the tubes (3, 4) they are communicated to the sensor (2) through holes provided with joints and membranes, which completely isolate the sensor from the tube through which the user makes the expiration. 7.- Espirómetro portátil de pico según reivindicaciones anteriores, caracterizado porque el tubo (1) se sujeta al cuerpo del aparato en una acalanadura del mismo, del mismo diámetro de este tubo (1). 7.- Portable peak spirometer according to previous claims, characterized in that the tube (1) is attached to the body of the apparatus in a groove thereof, of the same diameter of this tube (1).
PCT/ES2002/000578 2001-10-22 2002-12-04 Portable peak flow meter Ceased WO2004049940A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES200102319A ES2188405B1 (en) 2001-10-22 2001-10-22 PORTABLE SPIROMETER OF PICO.
PCT/ES2002/000578 WO2004049940A1 (en) 2001-10-22 2002-12-04 Portable peak flow meter
AU2002358822A AU2002358822A1 (en) 2002-12-04 2002-12-04 Portable peak flow meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200102319A ES2188405B1 (en) 2001-10-22 2001-10-22 PORTABLE SPIROMETER OF PICO.
PCT/ES2002/000578 WO2004049940A1 (en) 2001-10-22 2002-12-04 Portable peak flow meter

Publications (1)

Publication Number Publication Date
WO2004049940A1 true WO2004049940A1 (en) 2004-06-17

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PCT/ES2002/000578 Ceased WO2004049940A1 (en) 2001-10-22 2002-12-04 Portable peak flow meter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10466082B2 (en) 2015-01-08 2019-11-05 University Of Surrey Flow meter

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH0268108A (en) * 1988-08-31 1990-03-07 Shintou Dasutokorekutaa Kk Automatic airflow monitoring device in dust collector
GB2267758A (en) * 1992-05-28 1993-12-15 Nagano Limited Airflow measuring device
ES2073542T3 (en) * 1990-01-04 1995-08-16 Glaxo Wellcome Australia Ltd SPIROMETER.
WO1996010360A1 (en) * 1994-09-30 1996-04-11 Societe De Thermoformage Et D'injection Des Plastiques - S.T.I. Plastic Apparatus for measuring the peak expiratory rate
WO1997020500A1 (en) * 1995-12-05 1997-06-12 Pulmonary Interface, Inc. Pulmonary interface system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0268108A (en) * 1988-08-31 1990-03-07 Shintou Dasutokorekutaa Kk Automatic airflow monitoring device in dust collector
ES2073542T3 (en) * 1990-01-04 1995-08-16 Glaxo Wellcome Australia Ltd SPIROMETER.
GB2267758A (en) * 1992-05-28 1993-12-15 Nagano Limited Airflow measuring device
WO1996010360A1 (en) * 1994-09-30 1996-04-11 Societe De Thermoformage Et D'injection Des Plastiques - S.T.I. Plastic Apparatus for measuring the peak expiratory rate
WO1997020500A1 (en) * 1995-12-05 1997-06-12 Pulmonary Interface, Inc. Pulmonary interface system

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Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10466082B2 (en) 2015-01-08 2019-11-05 University Of Surrey Flow meter

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