JP2016120256A - Ultrasonic precision pulmonary function test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic precision pulmonary function test device which can accurately measure trace amount component information and flow rates of four types of gasses.SOLUTION: An ultrasonic precision pulmonary function test device accurately measures the flow rate of inspiration/expiration of a subject by using an ultrasonic flow meter to which trace amount component information of gasses can be given, is constituted by a tube having an opening structure provided with a membrane filter capable of being used as a replaceable type in a propagation path of the ultrasonic wave on the inner side of a measurement pipe using such characteristics of the ultrasonic flow meter that no protrusion and narrow section are provided inside the measurement pipe, and prevents infection between subjects.SELECTED DRAWING: Figure 1

Description

  The present invention relates to flow measurement of a precision lung function testing apparatus used for testing carbon monoxide lung diffusion ability using an ultrasonic flow meter.

  The precision lung function test used for the conventional carbon monoxide lung diffusion capacity test requires a device different from a normal spirometer.

  Precise pulmonary function test allows the subject to inhale four types of medical gas containing low-concentration carbon dioxide gas, stop breathing for 10 seconds, and determine the amount of carbon dioxide gas transferred into the blood during that time to measure lung diffusibility This is a test, in which the exhaled gas of the subject is once inside the apparatus, and the amount of oxygen taken in by the measurer is estimated by detecting and analyzing the carbon dioxide concentration in the gas component.

  The components and concentrations of the four kinds of medical gases are approximately 21% oxygen, 10% helium, 0.3% carbon, and the rest is nitrogen. In the precise lung function test, it is necessary for the subject to be tested to accurately measure the amount of the four types of gas inhaled and exhaled, but this has not been realized at present.

  In the conventional measurement method so far, the flow rate is estimated by separating and separating the discharge amount of the subject at a fixed time without measuring the accurate flow rate, but the physique and age of the subject, Depending on the medical condition, the time separation method may be inaccurate.

  For spirometry, a highly accurate measurement performance is required at a flow rate measurement range of 0 to 960 liters per minute with a structure with low resistance that does not impede breathing of the subject.

  In a spirometer using an ultrasonic flow meter, an ultrasonic propagation path consisting of a pair of ultrasonic transducers is provided obliquely in the direction of flow upstream and downstream of the measurement tube flow path, and from the upstream transducer This is realized by transmitting ultrasonic waves in the flow direction, receiving the ultrasonic waves with a transducer on the downstream side, and measuring the propagation time of the ultrasonic waves to the transducers.

  In addition, as a feature of the ultrasonic spirometer, it is possible to protect the flow path from bacteria and saliva scattered from the patient's breath by using a disposable exchangeable tube inserted into the measurement pipe flow path. By replacing the tube for each insurer, it is possible to prevent infection between subjects.

  It is necessary to accurately measure the amount that the subject inhales and exhales the four types of medical gases.

  The precise lung function test apparatus used for the examination of carbon monoxide lung diffusing capacity is to perform vital capacity measurement not only for the four gases but also for air.

  A structure that maintains the infection prevention function between patients to be measured.

  In order to accurately measure the amount of inhalation and exhalation of the four types of medical gases, the calculation formula of the ultrasonic flowmeter is calculated using the normal sound velocity value (350 m / s) and the sound velocity value (second rate) of the four gases. This is a device that can be solved by performing fine adjustment to correct the difference of 367 m).

  The exhaled breath when the medical four-type gas is inhaled, oxygen is taken in the body, the component changes, and the sound velocity value changes in the same manner. Therefore, the ultrasonic flowmeter structure is provided with an ultrasonic propagation path composed of a pair of ultrasonic transducers in the upstream and downstream of the flow path, obliquely in the flow direction, and the upstream and downstream ultrasonic transducers The flow velocity of the fluid in the measuring tube is calculated from the difference in propagation time between transmission and reception. Provided is an ultrasonic precision lung function testing apparatus based on a measurement principle in which an error is extremely small as a result of calculation as a method for detecting a flow rate of a fluid, that is, an inspiratory expiration of a subject.

This can be solved by using a removable tube with a rectifying structure attached to the flow channel of the measuring tube.
The present invention is an ultrasonic precision lung function testing apparatus having the above-described configuration.

  By using an ultrasonic flow meter to measure the flow rate of a precision lung function testing device used for testing carbon monoxide lung diffusion capacity, highly accurate flow rate measurements can be obtained for both exhalation and inspiration of the subject. .

  By inserting a tube that can be easily removed into the flow channel of the measurement tube and replacing the tube for each subject, the saliva droplets emitted from the inspiratory breath of the subject And fungi are prevented from propagating to other subjects via the measuring tube, and infection between subjects can be prevented.

  By using an ultrasonic flowmeter to measure the flow rate of a precision lung function tester used for testing carbon monoxide lung diffusion capacity, it is possible to measure vital capacity with the same device.

It is the figure which showed the whole measuring tube of this invention. It is the figure which showed the exchangeable pipe | tube removed from the measurement pipe | tube of this invention.

  FIG. 1 is a cross-sectional view illustrating the ultrasonic propagation path and the position of an exchangeable tube in a measurement tube of an ultrasonic flowmeter. FIG. 2 illustrates the structure of a replaceable tube.

  With regard to spirometry, a highly accurate measurement performance is possible in a flow rate measurement range of 0 to 960 liters per minute with a structure with little resistance that does not impede breathing of the measurer.

  In addition, by measuring the flow rate of 0 to 960 liters per minute with respect to the four kinds of gases and air and having the function of measuring the vital capacity, it can be used for the examination of the carbon monoxide lung diffusion ability.

  In a spirometer using an ultrasonic flow meter, an ultrasonic propagation path consisting of a pair of ultrasonic transducers is provided obliquely in the direction of flow upstream and downstream of the measurement tube flow path, and from the upstream transducer This is realized by transmitting ultrasonic waves in the flow direction, receiving the ultrasonic waves with a transducer on the downstream side, and measuring the propagation time of the ultrasonic waves to the transducers.

  In addition, as a feature of the ultrasonic spirometer, it is possible to protect the flow path from bacteria and saliva scattered from the patient's breath by using a disposable exchangeable tube inserted into the measurement pipe flow path. By replacing the tube for each subject, infection between the subjects can be prevented.

  It can be used for the examination of the carbon monoxide lung diffusing capacity equipped with an ultrasonic flow meter capable of accurately measuring the amount of inhalation and exhalation of the medical four kinds of gases.

  This gives the function of accurately measuring the flow rate of the gas by adding the trace component information of the four kinds of gases.

  A structure is used in which a removable tube is inserted into the measuring tube of the precision lung function testing device of the present invention.

  The present invention relates to a precision lung function testing apparatus used for testing carbon monoxide lung diffusion ability using an ultrasonic flowmeter, and provides a flow rate of inhaled exhaled breath of a subject by giving trace information of four kinds of medical gases. It has the function to measure accurately.

  By inserting a tube that can be easily replaced for each subject inside the measuring tube, infection between the subjects is prevented.

1 Measuring tube 2 Ultrasonic element 3 Ultrasonic propagation path,
4 Membrane filter 5 Removable tube 6 Measurement gas flow path

Claims (4)

  Precision lung function testing device used for testing carbon monoxide lung diffusion capacity equipped with an ultrasonic flow meter that has the function of measuring the flow rate of four types of gases.   A precision lung function testing device used for testing carbon monoxide lung diffusion capacity, equipped with an ultrasonic flow meter that has the function of accurately measuring the gas flow rate by giving information on the trace components of the four gases.   A precision lung function tester with a structure in which a removable tube is inserted into the measurement tube of a precision lung function tester used for testing carbon monoxide lung diffusion capacity.   Equipped with an ultrasonic flow meter that has the function of accurately measuring the flow rate of 0 to 960 liters per minute for four gases and air. Precision lung function testing device used.

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