WO2009027556A2 - Method for obtaining heart rate and respiratory rate from electronic scales - Google Patents
Method for obtaining heart rate and respiratory rate from electronic scales Download PDFInfo
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- WO2009027556A2 WO2009027556A2 PCT/ES2008/000533 ES2008000533W WO2009027556A2 WO 2009027556 A2 WO2009027556 A2 WO 2009027556A2 ES 2008000533 W ES2008000533 W ES 2008000533W WO 2009027556 A2 WO2009027556 A2 WO 2009027556A2
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- Prior art keywords
- heart rate
- scale
- signal
- weight
- measuring
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/44—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
- G01G19/50—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons having additional measuring devices, e.g. for height
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1102—Ballistocardiography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
- G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
- G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
- G01G19/4146—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only for controlling caloric intake, e.g. diet control
Definitions
- the participation of each person in the care of their own health is essential in a health policy based on prevention, and also to reduce costs in the postoperative phases or in the necessary care in chronic diseases.
- One way to encourage such participation is through the prescription of physical exercise, for example in cases of obesity. Said exercise should always be carried out within a range of effort, determined by the maximum recommended heart rate.
- the measurement of heart rate and body weight can reveal the existence of accumulation of fluids in the lung and heart failure.
- SUBSTITUTE SHEET (RULE 26) The simple body weight. Already in 1938 a mechanical scale was proposed with a needle indicator (rotating) for the weight and another indicator combined with the first and supported by a pair of helical springs capable of detecting beats and that caused a disk to oscillate that interrupted a beam of lightning. light so that its projection through a suitable optical system was made visible to the observer (US Patent 2,141, 246).
- ECG electrocardiogram
- SUBSTITUTE SHEET (RULE 26) Simpler alternative to detect the heart rate when electrodes are available on the platform is to detect the small fluctuations experienced by the baseline impedance measured between the feet and that are due to the circulation of blood through the legs (Spanish patent proposal P200502670).
- a generic proposal is to detect the fluctuations in weight due to the force that the heart makes when driving the blood, by means of a transformer element T, such as a strain gauge transducer, or a crystal or a piezoelectric ceramic that record the movements of the support (S) where the subject is placed.
- a transformer element T such as a strain gauge transducer, or a crystal or a piezoelectric ceramic that record the movements of the support (S) where the subject is placed.
- the detected signal is then amplified (A), to present the weight and process it further, obtaining its derivative (D), generating pulses (X) each of which corresponds to one of the rapid weight changes detected, and thus obtaining information of the heart rate; It is also proposed to integrate (I) the output signal of amplifier A to obtain the stroke volume.
- transducer T in said patent it is commented that it may be interesting to employ several separate transducers, so that one of them detects the weight of the person and another transducer detects changes in weight.
- This solution would be an electronic version of the mechanical scale of the US 2,141, 246 patent, where there are two mechanical detectors: one for the weight and another more sensitive that detects the changes in weight due to the heartbeat.
- SUBSTITUTE SHEET (RULE 26) WO94 / 06348, complemented with Figure 2 of the same patent, has the difficulty that the fluctuations of the weight due to the beat are so small that, even after amplifying the signal of the transducer to obtain an indication of the weight, the variations of said Signal due to heartbeat are hardly noticeable;
- the process of mathematical derivation which enhances all high frequency components, including those of the noise contributed by the amplifier, makes it even more difficult to perceive such tiny changes in force.
- the present invention consists in measuring the heart rate and respiratory rate of a subject located on an electronic bathroom scale, from the signal given by the load cells or other electronic sensor or sensors (1) arranged to measure the weight of The person, through high-pass filtering (2) of the signal from said sensors followed by high gain amplification (3) and subsequent electronic processing (5) to store (6), present (7) or communicate (8) the results, jointly or separately, regardless of the amplification of the weighing signal (4) (see Figure 1).
- FIG. 2 shows a possible embodiment of the method of Figure 1.
- the electronic processing to obtain the heart rate can be a low pass filtering (10) of the signal obtained with the high pass filter (2) and amplified
- said signal can be demodulated synchronously with the beat, using the pulses produced by the voltage comparator, and filtering low pass The output of the demodulator.
- Figure 3b shows the signal obtained with this embodiment, together with a reference signal (ECG, figure 3a) obtained with additional means, not included in this invention, with the purpose of illustrating the coincidence between the detected fluctuations of force and said signal.
- Figure 3c shows the train of pulses obtained by comparing the fluctuation signal of the filtered weight and the voltage threshold. The fluctuations of the peaks of Figure 3b (also noticeable in Figure 3a), are due to breathing.
- Figure 4 (above) shows the signal obtained by demodulating with the pulses of Figure 3c, signal 3b.
- Figure 4 (lower) is a signal proportional to the breath obtained from the changes in the transverse perimeter of the chest when breathing, and is shown only as a reference. The great coincidence between the signal obtained from the scale and this reference signal can be seen.
- Figure 1 block - corresponds to the electronic sensor that carries the scale itself to carry out the weighing;
- block 2 - is a high pass filter that rejects the signal that corresponds to the weight and allows the weight fluctuations to pass;
- block 3 - is a very high gain amplifier;
- block 4 - is the weighing amplifier;
- block 1 - corresponds to the electronic sensor that carries the scale itself to carry out the weighing
- block 10 - low pass filter for example with 10 Hz cutoff frequency, to limit noise
- block 11 - low gain amplifier for example with 10 Hz cutoff frequency
- Figure 3 the horizontal axis corresponds to the time in seconds; a) Trace of the electrocadiogram that allows to recognize in b) the fluctuations of force due to the beat, which are detected by a voltage comparator circuit to give a short pulse c) every time a beat is detected.
- Figure 4 the horizontal axis corresponds to the time in seconds. Upper part: signal proportional to the amplitude fluctuations of the force variations detected by the electronic sensor of the scale at each beat. Bottom: variations of the transverse diameter of the thorax obtained with a sensor that offers a reference signal to know the respiratory rate.
Abstract
The invention relates to a method for obtaining heart rate and respiratory rate from a traditional electronic scale, using only the weight sensors provided in the scale and without any action being exerted on the user, whereby the user simply has to stand on the scale. Moreover, it is not necessary for the user to remove his/her shoes, to grip any element or to position him/herself on the scale platform in a pre-determined manner. The information is obtained through the electronic processing of the signal from the weight sensors (1) built into the electronic scale. The high-frequency components of the signal are separated using a high-pass filter (2), amplified with a very high gain (3) and processed (5) in order to detect heart rate and respiratory rate, while a weight amplifier (4) having a much lower gain than that of the above-mentioned amplifier (3) obtains a signal proportional to weight, which the processor (5) can store (6), display (7) or communicate (8) together with or independently of the heart rate and the respiratory rate.
Description
Método para obtener Ia frecuencia cardiaca y Ia frecuencia respiratoria en básculas electrónicas pesa-personas Method to obtain the heart rate and respiratory rate in electronic scales weighing people
Sector de Ia técnicaTechnical sector
Instrumentación de medida y controlMeasurement and control instrumentation
Estado de Ia técnicaState of the art
La participación de cada persona en el cuidado de su propia salud es esencial en una política sanitaria basada en Ia prevención, y también para reducir costes en las fases postoperatorias o en los cuidados necesarios en enfermedades crónicas. Una manera de fomentar dicha participación es mediante Ia prescripción de ejercicio físico, por ejemplo en casos de obesidad. Dicho ejercicio debe realizarse siempre dentro de unos límites de esfuerzo, determinados por Ia frecuencia cardiaca máxima recomendada. En el caso de pacientes con cardiopatías, Ia medición de Ia frecuencia cardiaca y del peso corporal puede revelar Ia existencia de acumulación de líquidos en el pulmón e insuficiencia cardiaca.The participation of each person in the care of their own health is essential in a health policy based on prevention, and also to reduce costs in the postoperative phases or in the necessary care in chronic diseases. One way to encourage such participation is through the prescription of physical exercise, for example in cases of obesity. Said exercise should always be carried out within a range of effort, determined by the maximum recommended heart rate. In the case of patients with heart disease, the measurement of heart rate and body weight can reveal the existence of accumulation of fluids in the lung and heart failure.
La medida de parámetros fisiológicos con intención de diagnóstico está reservada al personal médico cualificado. No obstante, hay varios instrumentos comerciales de uso simple que permiten informarse sobre algún parámetro importante (peso corporal, frecuencia cardiaca), para tener un conocimiento aproximado de Ia condición física y motivar para su mantenimiento y mejora. Las básculas pesa- personas, en sus versiones de baño y para uso en lugares públicos, cumplen las condiciones de simplicidad de uso, comodidad, fiabilidad, ausencia de riesgos para el usuario y bajo coste, necesarias para poder ser utilizadas de forma autónoma por un número muy grande de personas.The measurement of physiological parameters with the intention of diagnosis is reserved for qualified medical personnel. However, there are several commercial instruments of simple use that allow information about some important parameter (body weight, heart rate), to have an approximate knowledge of the physical condition and motivate for its maintenance and improvement. Weighing scales, in their bathroom versions and for use in public places, meet the conditions of simplicity of use, comfort, reliability, absence of risks for the user and low cost, necessary to be used autonomously by a Very large number of people.
Por sus cualidades, las básculas pesa-personas han sido desde hace muchos años objeto de perfeccionamientos que permitieran obtener más información queDue to their qualities, weigh-people scales have been subject to improvements for many years to obtain more information than
HOJA DE SUSTITUCIÓN (REGLA 26)
el simple peso corporal. Ya en 1938 se propuso una báscula mecánica con un indicador de aguja (giratoria) para el peso y otro indicador combinado con el primero y soportado por un par de muelles helicoidales capaces de detectar los latidos y que hacían oscilar un disco que interrumpía un rayo de luz de modo que su proyección a través de un sistema óptico adecuado se hacía visible al observador (Patente US 2,141 ,246).SUBSTITUTE SHEET (RULE 26) The simple body weight. Already in 1938 a mechanical scale was proposed with a needle indicator (rotating) for the weight and another indicator combined with the first and supported by a pair of helical springs capable of detecting beats and that caused a disk to oscillate that interrupted a beam of lightning. light so that its projection through a suitable optical system was made visible to the observer (US Patent 2,141, 246).
Más recientemente, se ha propuesto estimar Ia composición corporal del cuerpo mediante Ia medida de Ia impedancia eléctrica basal (patente US 6,370,425 B1),que exige Ia adición de dos o cuatro electrodos conductores a Ia plataforma de pesada convencional de Ia báscula, o en unas asas en básculas con columna. A través de estos electrodos se inyecta una pequeña corriente alterna y se miden diferencias de potencial a partir de las cuales se calculan los parámetros que permiten estimar el porcentaje de grasa y de agua en el cuerpo. Esta inyección de corrientes, aunque minúsculas, es contraindicada para personas con dispositivos electrónicos implantados y durante el embarazo.More recently, it has been proposed to estimate the body composition of the body through the measurement of the baseline electrical impedance (US patent 6,370,425 B1), which requires the addition of two or four conductive electrodes to the conventional weighing platform of the scale, or in some handles on scales with column. Through these electrodes a small alternating current is injected and potential differences are measured from which the parameters that allow estimating the percentage of fat and water in the body are calculated. This injection of currents, although tiny, is contraindicated for people with implanted electronic devices and during pregnancy.
La detección de parámetros cardiovasculares partiendo de Ia báscula como interfaz para el usuario se ha venido basando en Ia adición de nuevos sensores que permitieran reducir el tiempo de medida, pues se miden varios parámetros a Ia vez, y el coste, por cuanto en una báscula con tales adiciones hay varios elementos mecánicos y electrónicos comunes, aunque los sensores para cada magnitud sean distintos. Así, por ejemplo, se ha propuesto incorporar en básculas electrónicas sensores de frecuencia cardiaca, temperatura, presión sanguínea, gasto cardiaco, altura y composición corporal (patente WO98/13674), y también temperatura plantar, presión sanguínea (medida en el brazo), frecuencia cardiaca, glucosa en Ia sangre y oxígeno en Ia sangre (patente WO01/89367). Cuando, además del peso, sólo se desea conocer Ia frecuencia cardiaca, puede ser suficiente añadir un sensor de infrarrojos o un par de electrodos (patente US2006/0116589 A1). También se puede detectar el electrocardiograma (ECG) con los mismos electrodos empleados para medir Ia impedancia basal a partir de Ia cual se estima Ia composición corporal (patente US2007/0021815 A1). UnaThe detection of cardiovascular parameters based on the scale as an interface for the user has been based on the addition of new sensors that allow reducing the measurement time, since several parameters are measured at the same time, and the cost, as a result of a scale With such additions there are several common mechanical and electronic elements, although the sensors for each magnitude are different. Thus, for example, it has been proposed to incorporate in electronic scales sensors of heart rate, temperature, blood pressure, cardiac output, height and body composition (WO98 / 13674 patent), and also plantar temperature, blood pressure (measured in the arm), heart rate, blood glucose and blood oxygen (WO01 / 89367). When, in addition to the weight, it is only desired to know the heart rate, it may be sufficient to add an infrared sensor or a pair of electrodes (US2006 / 0116589 A1). The electrocardiogram (ECG) can also be detected with the same electrodes used to measure the baseline impedance from which the body composition is estimated (US2007 / 0021815 A1). A
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alternativa más simple para detectar Ia frecuencia cardiaca cuando se dispone de electrodos en Ia plataforma es detectar las pequeñas fluctuaciones que experimenta Ia impedancia basal medida entre los pies y que son debidas a Ia circulación de sangre por las piernas (propuesta de patente española P200502670).SUBSTITUTE SHEET (RULE 26) Simpler alternative to detect the heart rate when electrodes are available on the platform is to detect the small fluctuations experienced by the baseline impedance measured between the feet and that are due to the circulation of blood through the legs (Spanish patent proposal P200502670).
El interés que tiene Ia información sobre el sistema cardiovascular, y Ia facilidad y comodidad de uso que tiene una báscula para Ia mayoría de las personas, ha motivado Ia propuesta de soluciones basadas en una plataforma mecánica, tal como una báscula. Una propuesta genérica (patente WO94/06348) es detectar las fluctuaciones del peso debidas a Ia fuerza que hace el corazón al impulsar Ia sangre, mediante un elemento transformador T, tal como un transductor de galgas extensiométricas, o un cristal o una cerámica piezoeléctrica que registre los movimientos del soporte (S) donde se coloca el sujeto. La señal detectada es después amplificada (A), para presentar el peso y procesarla más, obteniendo su derivada (D), generando pulsos (X) cada uno de los cuales corresponda a uno de los cambios rápidos de peso detectados, y obtener así información de Ia frecuencia cardiaca; también se propone integrar (I) Ia señal de salida del amplificador A para obtener el volumen de embolada. Para el transductor T, en dicha patente se comenta que puede ser interesante emplear varios transductores separados, de manera que uno de ellos detecte el peso de Ia persona y otro transductor distinto detecte los cambios en el peso. Esta solución sería una versión electrónica de Ia báscula mecánica de Ia patente US 2,141 ,246, donde hay dos detectores mecánicos: uno para el peso y otro más sensible que detecte los cambios de peso debidos al latido cardiaco. En Ia patente WO94/06348, también se considera preferible el uso de un transductor para el peso (galgas extensiométricas) y otro para las variaciones de peso (elemento piezoeléctrico), cuando Ia señal del transductor de peso es empleada para alterar Ia frecuencia de un oscilador y a partir de dicha frecuencia se deriva Ia indicación de peso.The interest of information on the cardiovascular system, and the ease and convenience of use that a scale has for most people, has motivated the proposal of solutions based on a mechanical platform, such as a scale. A generic proposal (patent WO94 / 06348) is to detect the fluctuations in weight due to the force that the heart makes when driving the blood, by means of a transformer element T, such as a strain gauge transducer, or a crystal or a piezoelectric ceramic that record the movements of the support (S) where the subject is placed. The detected signal is then amplified (A), to present the weight and process it further, obtaining its derivative (D), generating pulses (X) each of which corresponds to one of the rapid weight changes detected, and thus obtaining information of the heart rate; It is also proposed to integrate (I) the output signal of amplifier A to obtain the stroke volume. For transducer T, in said patent it is commented that it may be interesting to employ several separate transducers, so that one of them detects the weight of the person and another transducer detects changes in weight. This solution would be an electronic version of the mechanical scale of the US 2,141, 246 patent, where there are two mechanical detectors: one for the weight and another more sensitive that detects the changes in weight due to the heartbeat. In WO94 / 06348, it is also considered preferable to use a transducer for weight (strain gauges) and another for weight variations (piezoelectric element), when the weight transducer signal is used to alter the frequency of a oscillator and from that frequency the weight indication is derived.
El empleo de un solo transductor dispuesto en un elemento elástico que soporte Ia plataforma de Ia báscula, tal como se indica en Ia figura 3a de Ia patenteThe use of a single transducer arranged in an elastic element that supports the platform of the scale, as indicated in Figure 3a of the patent
HOJA DE SUSTITUCIÓN (REGLA 26)
WO94/06348, complementada con Ia figura 2 de Ia misma patente, tiene Ia dificultad de que las fluctuaciones del peso debidas al latido son tan minúsculas que, incluso después de amplificar Ia señal del transductor para obtener una indicación del peso, las variaciones de dicha señal debidas al latido son difícilmente perceptibles; además, el proceso de derivación matemática, que realza todas las componentes de alta frecuenta, incluidas las del ruido aportado por el amplificador, hace todavía más difícil Ia percepción de dichos cambios minúsculos de fuerza.SUBSTITUTE SHEET (RULE 26) WO94 / 06348, complemented with Figure 2 of the same patent, has the difficulty that the fluctuations of the weight due to the beat are so small that, even after amplifying the signal of the transducer to obtain an indication of the weight, the variations of said Signal due to heartbeat are hardly noticeable; In addition, the process of mathematical derivation, which enhances all high frequency components, including those of the noise contributed by the amplifier, makes it even more difficult to perceive such tiny changes in force.
Por otra parte, es sabido que Ia respiración modula en mayor o menor grado Ia amplitud de todas las señales del sistema cardiovascular. Por Io tanto también debe afectar a las fluctuaciones del peso de una persona que esté sobre una báscula o una plataforma mecánica sujeta mediante soportes elásticos. La observación de estos cambios de amplitud en el ECG es prácticamente tan antigua como Ia electrocardiografía, pero no se conocen antecedentes sobre su observación en las fluctuaciones de peso debidas al latido cardiaco.On the other hand, it is known that breathing modulates to a greater or lesser extent the amplitude of all the signals of the cardiovascular system. Therefore, it should also affect the fluctuations of the weight of a person who is on a scale or a mechanical platform secured by elastic supports. The observation of these changes in amplitude in the ECG is practically as old as electrocardiography, but there is no known history of its observation in the fluctuations of weight due to the heartbeat.
Descripción de Ia invenciónDescription of the invention
La presente invención consiste en medir Ia frecuencia cardiaca y Ia frecuencia respiratoria de un sujeto situado sobre una báscula de baño electrónica, a partir de Ia señal que dan las células de carga u otro sensor o sensores electrónicos (1) dispuestos para medir el peso de Ia persona, mediante el filtrado paso alto (2) de Ia señal procedente de dichos sensores seguido de amplificación de alta ganancia (3) y posterior procesamiento electrónico (5) para almacenar (6), presentar (7) o comunicar (8) los resultados, de forma conjunta o separada, con independencia de Ia amplificación de Ia señal de pesada (4) (ver Ia figura 1).The present invention consists in measuring the heart rate and respiratory rate of a subject located on an electronic bathroom scale, from the signal given by the load cells or other electronic sensor or sensors (1) arranged to measure the weight of The person, through high-pass filtering (2) of the signal from said sensors followed by high gain amplification (3) and subsequent electronic processing (5) to store (6), present (7) or communicate (8) the results, jointly or separately, regardless of the amplification of the weighing signal (4) (see Figure 1).
La figura 2 muestra una posible realización del método de Ia figura 1. El procesamiento electrónico para obtener Ia frecuencia cardiaca puede ser un filtrado paso bajo (10) de Ia señal obtenida con el filtro paso alto (2) y amplificadaFigure 2 shows a possible embodiment of the method of Figure 1. The electronic processing to obtain the heart rate can be a low pass filtering (10) of the signal obtained with the high pass filter (2) and amplified
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(9), seguido de una segunda amplificación de menor ganancia (11) y comparación con un umbral de tensión que evolucione de forma proporcional al valor medio de Ia señal de salida de este segundo amplificador (11). Cuando Ia amplitud de Ia señal doblemente amplificada supera dicho umbral, se genera un pulso que corresponde a un latido.SUBSTITUTE SHEET (RULE 26) (9), followed by a second amplification of lower gain (11) and comparison with a voltage threshold that evolves proportionally to the average value of the output signal of this second amplifier (11). When the amplitude of the double amplified signal exceeds said threshold, a pulse that corresponds to a beat is generated.
Para obtener Ia frecuencia respiratoria a partir de las fluctuaciones de Ia amplitud de Ia señal de salida del segundo amplificador, se puede desmodular dicha señal de forma síncrona con el latido, empleando para ello los pulsos que produce el comparador de tensión, y filtrar paso bajo Ia salida del desmodulador.To obtain the respiratory rate from the fluctuations of the amplitude of the output signal of the second amplifier, said signal can be demodulated synchronously with the beat, using the pulses produced by the voltage comparator, and filtering low pass The output of the demodulator.
La figura 3b muestra Ia señal obtenida con esta realización, junto con una señal de referencia (ECG, figura 3a) obtenida con medios adicionales, no incluidos en esta invención, con el propósito de ilustrar Ia coincidencia entre las fluctuaciones de fuerza detectadas y dicha señal de referencia. La figura 3c muestra el tren de pulsos obtenidos mediante Ia comparación de Ia señal de fluctuación de peso filtrada y el umbral de tensión. Las fluctuaciones de los picos de Ia figura 3b (también apreciables en Ia figura 3a), son debidas a Ia respiración.Figure 3b shows the signal obtained with this embodiment, together with a reference signal (ECG, figure 3a) obtained with additional means, not included in this invention, with the purpose of illustrating the coincidence between the detected fluctuations of force and said signal. reference. Figure 3c shows the train of pulses obtained by comparing the fluctuation signal of the filtered weight and the voltage threshold. The fluctuations of the peaks of Figure 3b (also noticeable in Figure 3a), are due to breathing.
La figura 4 (superior) muestra Ia señal obtenida al desmodular con los pulsos de Ia figura 3c, Ia señal 3b. La figura 4 (inferior) es una señal proporcional a Ia respiración obtenida a partir de los cambios de perímetro transversal del tórax al respirar, y se muestra sólo como referencia. Se puede ver Ia gran coincidencia que hay entre Ia señal obtenida a partir de Ia báscula y esta señal de referencia.Figure 4 (above) shows the signal obtained by demodulating with the pulses of Figure 3c, signal 3b. Figure 4 (lower) is a signal proportional to the breath obtained from the changes in the transverse perimeter of the chest when breathing, and is shown only as a reference. The great coincidence between the signal obtained from the scale and this reference signal can be seen.
La aplicación del método descrito en Ia figura 2 de Ia patente WO94/06348, donde primero se amplifica Ia señal y después se somete a distintos algoritmos de procesamiento, no permite reconocer siquiera las fluctuaciones de fuerza a simple vista, en contraste con Ia señal que se muestra en Ia figura 3b y obtenida con el método descrito en esta invención. Esto es debido a que Ia señal que dan los sensores de Ia báscula como respuesta al peso del sujeto, es tan grande que IaThe application of the method described in Figure 2 of the WO94 / 06348 patent, where the signal is first amplified and then subjected to different processing algorithms, does not even recognize force fluctuations at a glance, in contrast to the signal that It is shown in Figure 3b and obtained with the method described in this invention. This is because the signal given by the sensors of the scale in response to the weight of the subject is so large that
HOJA DE SUSTITUCIÓN (REGLA 26)
ganancia del amplificador (4) debe ser muy inferior a Ia ganancia del amplificador (3) empleado en el método propuesto en esta invención.SUBSTITUTE SHEET (RULE 26) The gain of the amplifier (4) must be much lower than the gain of the amplifier (3) used in the method proposed in this invention.
Descripción de las figurasDescription of the figures
Figura 1 : bloquel - corresponde al sensor electrónico que lleva Ia propia báscula para realizar Ia pesada; bloque 2 - es un filtro de paso alto que rechaza Ia señal que corresponde al peso y permite el paso de las fluctuaciones de peso; bloque 3 - es un amplificador de muy alta ganancia; bloque 4 - es el amplificador de pesada; bloque 5 - procesador electrónico de las señal de pesada y de Ia señal de fluctuaciones de peso; bloque 6 - memoria electrónica; bloque 7 - visualizador; bloque 8 - interfaz de comunicación.Figure 1: block - corresponds to the electronic sensor that carries the scale itself to carry out the weighing; block 2 - is a high pass filter that rejects the signal that corresponds to the weight and allows the weight fluctuations to pass; block 3 - is a very high gain amplifier; block 4 - is the weighing amplifier; block 5 - electronic processor of the weighing signal and the weight fluctuation signal; block 6 - electronic memory; block 7 - display; block 8 - communication interface.
Figura 2: bloque 1 - corresponde al sensor electrónico que lleva Ia propia báscula para efectuar Ia pesada; bloque 2 - filtro de paso alto con una frecuencia de corte de, por ejemplo, 0,1 Hz, que no deje pasar Ia señal relacionada con el peso, pero sí las fluctuaciones debidas al latido cardiaco; bloque 9 - amplificador de alta ganancia; bloque 10 - filtro de paso bajo, por ejemplo con frecuencia de corte de 10 Hz, para limitar el ruido; bloque 11 - amplificador de baja ganancia.Figure 2: block 1 - corresponds to the electronic sensor that carries the scale itself to carry out the weighing; block 2 - high pass filter with a cut-off frequency of, for example, 0.1 Hz, which does not let the weight-related signal pass, but fluctuations due to the heartbeat; block 9 - high gain amplifier; block 10 - low pass filter, for example with 10 Hz cutoff frequency, to limit noise; block 11 - low gain amplifier.
Figura 3: el eje horizontal corresponde al tiempo en segundos; a) Trazado del electrocadiograma que permite reconocer en b) las fluctuaciones de fuerza debidas al latido, que son detectadas por un circuito comparador de tensión para dar un impulso breve c) cada vez que se detecta un latido.Figure 3: the horizontal axis corresponds to the time in seconds; a) Trace of the electrocadiogram that allows to recognize in b) the fluctuations of force due to the beat, which are detected by a voltage comparator circuit to give a short pulse c) every time a beat is detected.
Figura 4: el eje horizontal corresponde al tiempo en segundos. Parte superior: señal proporcional a las fluctuaciones de amplitud de las variaciones de fuerza detectadas por el sensor electrónico de Ia báscula a cada latido. Parte inferior: variaciones del diámetro transversal del tórax obtenidas con un sensor que ofrece una señal de referencia para saber Ia frecuencia respiratoria.Figure 4: the horizontal axis corresponds to the time in seconds. Upper part: signal proportional to the amplitude fluctuations of the force variations detected by the electronic sensor of the scale at each beat. Bottom: variations of the transverse diameter of the thorax obtained with a sensor that offers a reference signal to know the respiratory rate.
HOJA DE SUSTITUCIÓN (REGLA 26)
SUBSTITUTE SHEET (RULE 26)
Claims
1. Método para medir Ia frecuencia cardiaca y Ia frecuencia respiratoria de una persona, caracterizado porque dichas frecuencias se obtienen a partir de las variaciones del peso de Ia persona situada sobre Ia plataforma de una báscula electrónica, detectadas mediante filtrado paso-alto, amplificación y posterior procesamiento electrónico de las señales que dan los propios sensores electrónicos incorporados en Ia báscula para realizar Ia pesada, cuyo procesamiento consiste en filtrado paso bajo y amplificación adicional para obtener una señal sincrónica con el latido.1. Method to measure the heart rate and respiratory rate of a person, characterized in that said frequencies are obtained from variations in the weight of the person located on the platform of an electronic scale, detected by high-pass filtering, amplification and subsequent electronic processing of the signals given by the electronic sensors incorporated in the scale to perform the weighing, whose processing consists of low pass filtering and additional amplification to obtain a synchronous signal with the beat.
2. Método para medir Ia frecuencia cardiaca y Ia frecuencia respiratoria, según Ia reivindicación 1 , caracterizado porque se aplica una señal de alimentación continua al sensor o sensores propios de Ia báscula.2. Method for measuring the heart rate and respiratory rate, according to claim 1, characterized in that a continuous power signal is applied to the sensor or sensors of the scale.
3. Método para medir Ia frecuencia cardiaca y Ia frecuencia respiratoria, según Ia reivindicación 1, caracterizado porque se aplica una señal de alimentación alterna al sensor o sensores propios de Ia báscula, y se utiliza desmodulación coherente tomando dicha señal alterna como referencia, después de haber filtrado paso alto y amplificado Ia señal de salida de dicho sensor o sensores de Ia báscula.3. Method for measuring the heart rate and respiratory rate, according to claim 1, characterized in that an alternating power signal is applied to the sensor or sensors of the scale itself, and coherent demodulation is used taking said alternating signal as a reference, after having filtered high pass and amplified the output signal of said sensor or sensors of the scale.
4. Método para medir Ia frecuencia cardiaca, según las reivindicaciones 1 y 2, caracterizado porque se obtiene el valor de Ia frecuencia cardiaca latido a latido.4. Method for measuring the heart rate according to claims 1 and 2, characterized in that the value of the heart rate beat to beat is obtained.
5. Método para medir Ia frecuencia cardiaca, según las reivindicaciones 1 y 2, caracterizado porque se obtiene el valor promedio de Ia frecuencia cardiaca durante un tiempo que se puede seleccionar.5. Method for measuring the heart rate, according to claims 1 and 2, characterized in that the average value of the heart rate is obtained for a time that can be selected.
6. Método para medir Ia frecuencia respiratoria, según las reivindicaciones 1 y 2, caracterizado porque dicha frecuencia se obtiene desmodulando de6. Method for measuring the respiratory rate, according to claims 1 and 2, characterized in that said frequency is obtained by demodulating
HOJA DE SUSTITUCIÓN (REGLA 26) forma sincrónica con el latido, una señal proporcional a las fluctuaciones de peso.SUBSTITUTE SHEET (RULE 26) synchronous with the beat, a signal proportional to the fluctuations in weight.
7. Método para medir Ia frecuencia cardiaca, según las reivindicaciones 1 y 3, caracterizado porque se obtiene el valor de Ia frecuencia cardiaca latido a latido.7. Method for measuring the heart rate according to claims 1 and 3, characterized in that the value of the heart rate beat to beat is obtained.
8. Método para medir Ia frecuencia cardiaca, según las reivindicaciones 1 y 3, caracterizado porque se obtiene el valor promedio de Ia frecuencia cardiaca durante un tiempo que se puede seleccionar.8. Method for measuring the heart rate according to claims 1 and 3, characterized in that the average value of the heart rate is obtained for a time that can be selected.
9. Método para medir Ia frecuencia respiratoria, según las reivindicaciones 1 y 3, caracterizado porque dicha frecuencia se obtiene desmodulando de forma sincrónica con el latido, una señal proporcional a las fluctuaciones de peso.9. Method for measuring the respiratory rate, according to claims 1 and 3, characterized in that said frequency is obtained by synchronously demodulating the beat, a signal proportional to the weight fluctuations.
HOJA DE SUSTITUCIÓN (REGLA 26) SUBSTITUTE SHEET (RULE 26)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200702181A ES2328205B1 (en) | 2007-07-30 | 2007-07-30 | METHOD FOR OBTAINING CARDIAC FREQUENCY AND RESPIRATORY FREQUENCY IN A PESA-PEOPLE ELECTRONIC SCALE. |
| ESP200702181 | 2007-07-30 |
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| Publication Number | Publication Date |
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| WO2009027556A2 true WO2009027556A2 (en) | 2009-03-05 |
| WO2009027556A3 WO2009027556A3 (en) | 2009-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2008/000533 WO2009027556A2 (en) | 2007-07-30 | 2008-07-30 | Method for obtaining heart rate and respiratory rate from electronic scales |
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| ES (1) | ES2328205B1 (en) |
| WO (1) | WO2009027556A2 (en) |
Cited By (3)
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| EP2148179A1 (en) * | 2008-07-25 | 2010-01-27 | Tanita Corporation | Load converter and measuring device |
| US9011346B2 (en) | 2011-01-27 | 2015-04-21 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for monitoring the circulatory system |
| US10271741B2 (en) | 2015-09-15 | 2019-04-30 | Huami Inc. | Biometric scale |
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| US8870780B2 (en) | 2008-10-15 | 2014-10-28 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for monitoring heart function |
| FR3000544B1 (en) * | 2013-01-02 | 2015-11-27 | Withings | MULTI-FUNCTION WEIGHING DEVICE |
| US9546898B2 (en) | 2014-06-12 | 2017-01-17 | PhysioWave, Inc. | Fitness testing scale |
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| CN109009051A (en) * | 2018-06-26 | 2018-12-18 | 广州视源电子科技股份有限公司 | Method for measuring heart rate, device, equipment and storage medium |
| CN109077714B (en) * | 2018-07-05 | 2021-03-23 | 广州视源电子科技股份有限公司 | Signal identification method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2148179A1 (en) * | 2008-07-25 | 2010-01-27 | Tanita Corporation | Load converter and measuring device |
| US9011346B2 (en) | 2011-01-27 | 2015-04-21 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for monitoring the circulatory system |
| US9241637B2 (en) | 2011-01-27 | 2016-01-26 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for monitoring the circulatory system |
| US9833151B2 (en) | 2011-01-27 | 2017-12-05 | The Board Of Trustees Of The Leland Stanford Junior University | Systems and methods for monitoring the circulatory system |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2009027556A3 (en) | 2009-04-16 |
| ES2328205B1 (en) | 2010-08-30 |
| ES2328205A1 (en) | 2009-11-10 |
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