CN112568894A - Respiration detection device and oxygen concentration device - Google Patents
Respiration detection device and oxygen concentration device Download PDFInfo
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- CN112568894A CN112568894A CN202011021939.8A CN202011021939A CN112568894A CN 112568894 A CN112568894 A CN 112568894A CN 202011021939 A CN202011021939 A CN 202011021939A CN 112568894 A CN112568894 A CN 112568894A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 239000001301 oxygen Substances 0.000 title claims abstract description 114
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 114
- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 69
- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 239000007789 gas Substances 0.000 claims abstract description 92
- 238000007599 discharging Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000000241 respiratory effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000035565 breathing frequency Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000002664 inhalation therapy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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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
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/082—Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M16/101—Preparation of respiratory gases or vapours with O2 features or with parameter measurement using an oxygen concentrator
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/0027—Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/42—Reducing noise
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- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Pulmonology (AREA)
- Emergency Medicine (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Animal Behavior & Ethology (AREA)
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- Public Health (AREA)
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- Separation Of Gases By Adsorption (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Abstract
A respiration detection device capable of reducing noise of pressure in a supply flow path from a generation part of oxygen-enriched gas to a discharge port of a sleeve. The respiration detection device (31) includes: a pressure sensor (33) for detecting a change in pressure of the oxygen-concentrated gas in a supply flow path (15, 21b) that connects a generation unit (12) of the oxygen-concentrated gas in the oxygen concentration device (11) and a discharge port (21a) of the oxygen-concentrated gas in the sleeve (21); a connection pipe (32) that connects the supply flow paths (15, 21b) and the pressure sensor (33) and that allows the oxygen-concentrated gas to flow from the supply flow paths (15, 21b) to the pressure sensor (33); and a noise filter (34) that is provided to the connection pipe (32) and reduces noise applied to the pressure of the oxygen-concentrated gas.
Description
Technical Field
The present disclosure relates to a respiration detection device and an oxygen concentration device.
Background
Patent document 1 below discloses an oxygen concentration device including: a generation unit that generates an oxygen-concentrated gas in which the oxygen concentration is increased; a discharge unit that discharges the oxygen-concentrated gas generated by the generation unit; a pressure sensor connected to a supply flow path of the oxygen concentrated gas connecting the generating section and the discharging section; a sleeve connected with the discharge portion; a control section that controls the generation section and the like. The pressure sensor detects the breathing of the patient wearing the cannula by measuring a pressure change in the supply flow path. The control unit detects a patient state such as a resting state or a working state based on the detected waveform of respiration, and adjusts the supply flow rate of the oxygen enriched gas.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018-114194
Disclosure of Invention
Technical problem to be solved by the invention
In the conventional oxygen concentration device, since turbulence is generated in the flow of the oxygen concentrated gas in the generation section or the supply flow path from the generation section to the discharge section, vibration is applied to the pressure of the oxygen concentrated gas, and the vibration may be detected by the pressure sensor as noise (noise: noise, interference). Such noise causes, for example, a decrease in accuracy when detecting the state of the patient from the waveform of respiration.
An object of the present disclosure is to provide a respiration detection device and an oxygen concentration device that can reduce noise of pressure in a supply flow path from a generation portion of oxygen-concentrated gas to a discharge port of a sleeve.
Technical scheme for solving technical problem
(1) The breath detection device of the present disclosure includes: a pressure sensor for detecting a pressure change of the oxygen concentrated gas in a supply flow path that connects a generation portion of the oxygen concentrated gas in the oxygen concentration device and a discharge port of the oxygen concentrated gas in the jacket; a connection pipe that connects the supply flow path and the pressure sensor and that allows the oxygen-concentrated gas to flow from the supply flow path to the pressure sensor; and a noise filter which is provided to the connection pipe and reduces noise applied to the pressure of the oxygen enriched gas.
According to the above configuration, the noise applied to the pressure of the oxygen enriched gas in the supply passage is reduced by the noise filter, so that the pressure change of the oxygen enriched gas can be accurately measured by the pressure sensor, and the respiration of the patient can be accurately detected. Therefore, for example, the state of the patient can be identified with high accuracy using the respiratory waveform.
(2) Preferably, a hole having an inner diameter smaller than that of the connection pipe is formed on the noise filter, and the oxygen concentrated gas is passed through the hole.
According to the above configuration, by passing the oxygen-concentrated gas through the hole having the inner diameter smaller than the inner diameter of the connection pipe, noise can be reduced.
(3) Preferably, the inner diameter of the hole is 0.025 times or more and 0.25 times or less the inner diameter of the connection pipe.
According to the above configuration, the pressure change can be measured by the pressure sensor with reduced noise.
(4) Preferably, the distance between the pressure sensor and the noise filter is 4 times or more the inner diameter of the connection pipe.
According to the above configuration, it is possible to suppress the turbulence of the flow of the oxygen enriched gas passing through the holes of the noise filter from affecting the measurement value of the pressure sensor.
(5) Preferably, the noise filter has an expansion chamber having an inner diameter larger than that of the connection pipe, and the oxygen concentrated gas is passed through the expansion chamber.
According to the above configuration, the oxygen-concentrated gas can be made to flow into the expansion chamber of the noise filter, thereby reducing the noise of the pressure.
(6) Preferably, the oxygen concentrator includes: a discharge unit for discharging the oxygen-concentrated gas to the outside of the oxygen concentration device; and a flow rate adjusting unit that adjusts a flow rate of the oxygen-concentrated gas in a supply flow path between the generating unit and the discharging unit.
In the case where the oxygen concentrator includes the flow rate adjusting unit, the flow path is narrowed or enlarged to adjust the flow rate of the oxygen-concentrated gas, and therefore turbulence is likely to occur in the flow of the oxygen-concentrated gas, and pressure noise is also likely to occur. Therefore, it is more effective to have such a noise filter as described above.
(7) Preferably, the oxygen concentrator has a discharge unit for discharging oxygen to the outside of the oxygen concentrator, and the connection pipe is connected to a supply flow path of the oxygen-concentrated gas between the discharge unit and the discharge port of the jacket.
According to the above configuration, the respiration detection device can be attached to the outside of the oxygen concentration device. Therefore, the respiration detection function can be added to the oxygen concentration device having no respiration detection function.
(8) The oxygen concentrator of this disclosure includes:
a generation unit that generates an oxygen-concentrated gas;
a discharge unit that discharges the oxygen-concentrated gas generated in the generation unit; and
the respiration detection device according to any one of (1) to (6) above,
the connection tube of the respiration detection device is connected to a supply channel of oxygen-enriched gas, and the supply channel connects the generation unit and the discharge unit.
According to the above configuration, the respiration detection device can be incorporated in the oxygen concentration device, and the respiration state of the patient detected by the pressure sensor can be managed in association with the operating state of the oxygen concentration device and the like.
Drawings
Fig. 1 is a schematic diagram showing an oxygen concentrator including a respiration detection device according to a first embodiment.
Fig. 2 is a schematic sectional view of the respiration detection device.
Fig. 3 is a schematic cross-sectional view showing a modification of the breath detection device.
Fig. 4 is a schematic diagram showing a respiration detection device and an oxygen concentration device according to a second embodiment.
Fig. 5 is an explanatory diagram showing a pipe connection portion of the breath detection device.
Detailed Description
Hereinafter, a breath detection device and an oxygen concentration device of an embodiment will be described with reference to the drawings.
[ first embodiment ]
Fig. 1 is a schematic diagram showing an oxygen concentrator including a respiration detection device according to a first embodiment.
As shown in fig. 1, the oxygen concentration device 11 supplies oxygen concentration gas to a patient who is receiving oxygen inhalation therapy. A cannula 21 for sucking oxygen-concentrated gas from the nose is connected to the oxygen concentrator 11, and the oxygen-concentrated gas is supplied to the patient wearing the cannula 21.
The sleeve 21 includes a supply passage 21b, and the supply passage 21b is formed in a tubular shape from a synthetic resin such as a vinyl chloride resin, and through which oxygen-supplying concentrated gas flows. An inlet 21c through which the oxygen-enriched gas flows is formed at one end of the supply passage 21b, and a pair of outlets 21a through which the oxygen-enriched gas is discharged are formed at the other end. The inflow port 21c is connected to the oxygen concentrator 11, and the pair of discharge ports 21a are inserted into the nose of the patient. Further, an oxygen-concentrated gas discharge device other than the sleeve 21 may be connected to the oxygen concentrator 11.
The oxygen concentrator 11 includes a generator 21, a flow rate adjuster 13, a discharger 14, a breath detector (breath detector) 31, and a controller 16. The generation unit 12, the flow rate adjustment unit 13, and the discharge unit 14 are connected by a supply flow path 15. The generation unit 12, the flow rate adjustment unit 13, the discharge unit 14, the respiration detection unit 31, the control unit 16, and the supply channel 15 are provided in one housing 17.
The generator 12 generates oxygen-concentrated gas. The generator 12 compresses air taken into the oxygen concentrator 11 from the outside by a known pressure swing adsorption method, for example, and adsorbs nitrogen in the compressed air by an adsorbent such as zeolite to generate an oxygen-concentrated gas having an oxygen concentration of about 90%. The oxygen-concentrated gas generated in the generator 12 is sent to the discharger 14 via the flow regulator 13.
The discharge unit 14 discharges the oxygen-concentrated gas generated by the generation unit 12 to the outside of the oxygen concentration device 11. The discharge portion 14 protrudes from the housing 17 to the outside so as to be able to be connected to the inlet 21c of the grommet 21. The discharge portion 14 is formed of a joint pipe or the like for connecting the sleeve 21.
The flow rate adjusting unit 13 adjusts the flow rate of the oxygen-enriched gas to be supplied to the patient. For example, the flow rate adjusting unit 13 adjusts the flow rate of the oxygen enriched gas supplied to the patient according to the breathing state detected by the breathing detecting unit 31. The flow rate adjusting unit 13 is constituted by a valve or the like capable of adjusting the opening degree.
The control unit 16 is constituted by a microcomputer including an arithmetic unit such as a CPU and a memory such as a RAM or a ROM. The control unit 16 performs operation control of the generation unit 12, the flow rate adjustment unit 13, the respiration detection unit 31, and the like by the CPU executing a control operation program stored in the memory. The control unit 16 also has a function of outputting various information stored in the memory.
Fig. 2 is a schematic cross-sectional view of the respiration sensing unit.
The respiration detection unit 31 includes a connection tube 32, a pressure sensor 33, and a noise filter 34. One end of the connection pipe 32 is connected to the middle of the supply passage 15. A pressure sensor 33 is provided at the other end of the connection pipe 32. A noise filter 34 is provided inside the connection pipe 32 between the supply passage 15 and the pressure sensor 33.
The connection pipe 32 is a pipe formed of synthetic resin such as polyurethane. The inner diameter d1 of the connecting tube 32 is, for example, 4 mm. However, the inner diameter d1 of the connecting tube 32 can be changed as appropriate.
The pressure sensor 33 is a condenser microphone employing a semi-permanently charged electret element. The condenser microphone can measure a dynamic pressure change at a low frequency such as 0.5Hz, and is suitable for sound pressure measurement of 1Pa or less.
The pressure sensor 33 is inserted into the other end of the connection pipe 32. The pressure sensor 33 can measure the pressure of the oxygen concentrated gas flowing from the supply passage 15 to the connection pipe 32. The pressure in the supply flow path 15 changes according to the breathing of the patient. Specifically, when the patient inhales the oxygen-enriched gas through the cannula 21, the pressure in the supply passage 15 decreases. When the patient exhales, the expiratory pressure of the patient acts from the exhaust port 21a into the sleeve 21, and therefore, the pressure in the supply flow path 15 rises. The pressure sensor 33 measures a pressure change in the supply channel caused by the respiration of the patient. With regard to the respiration of the patient, since expiration and inspiration are alternately and periodically repeated, the measurement value of the pressure sensor 33 exhibits a periodically changing respiration waveform.
The control unit 16 acquires the pressure change (respiration waveform) measured by the pressure sensor 33 and stores the pressure change in the memory.
The memory of the control unit 16 stores the supply flow rate of the oxygen enriched gas corresponding to the state of the patient. The patient's state refers to, for example, a resting state, a working state, and a sleeping state. The supply flow rate of the oxygen-enriched gas corresponding to the state of the patient is: for example, the supply flow rate is set to 2L in the rest state, 2.5L in the labor state, and 1.5L in the sleep state. The supply flow rate of the oxygen-concentrated gas is prescribed by a doctor in advance, and is input to and stored in the control unit 16.
The control unit 16 obtains the breathing frequency from the breathing waveform of the patient measured by the pressure sensor 33, and determines the state of the patient (the rest state, the work state, and the sleep state) from the magnitude of the fluctuation range. When the state of the patient is identified, the control unit 16 determines the flow rate of the oxygen enriched gas based on the state of the patient. The control unit 16 controls the flow rate adjusting unit 13 according to the determined flow rate of the oxygen-enriched gas. This enables the patient to be supplied with oxygen at an appropriate flow rate according to the respiratory waveform of the patient.
The memory of the control unit 16 also stores operation information such as the operation state of the oxygen concentrator 11. The operational information is correlated with information of the respiratory waveform of the patient. For example, information on the date on which the oxygen concentrator 11 is operated and information on the respiration waveform at that time are stored in the memory of the control unit 16 in a corresponding state. The above information can be used for a doctor to grasp the use state of the oxygen concentrator 11 of the patient, for example, whether the patient is using the oxygen concentrator 11 according to a prescription. For example, when the respiration waveform cannot be appropriately acquired even when the oxygen concentrator 11 is operating, it can be estimated that the patient is using the oxygen concentrator 11 in a state where the cannula 21 is not properly worn. Further, by measuring the breathing rate and the breathing interval acquired from the breathing information of the patient over a long period of time and diagnosing the same, it is possible to grasp the state of deterioration or improvement of the patient's condition. Thus, the physician can reflect the information stored in the memory to the treatment and examination of the patient.
When the oxygen-concentrated gas is discharged from the generating portion 12 or when the flow rate is adjusted by the flow rate adjusting portion 13, vibration may be applied to the pressure before the oxygen-concentrated gas reaches the discharging portion 14, and the vibration may be detected as noise by the pressure sensor 33. The respiration detection unit 31 of the present embodiment includes a noise filter 34 to suppress detection of noise by the pressure sensor 33.
The noise filter 34 of the respiration detection unit 31 is formed in a cylindrical shape. The noise filter 34 is attached to the connection pipe 32 in a state where the outer peripheral surface thereof is in close contact with the inner peripheral surface of the connection pipe 32. A hole 34a is formed in the noise filter 34, and an inner diameter d2 of the hole 34a is smaller than an inner diameter d1 of the connection tube 32. The oxygen concentrated gas flowing through the connection pipe 32 from the supply passage 15 reaches the pressure sensor 33 through the oxygen concentrated gas passage hole 34 a.
The inner diameter d2 of the hole 34a of the noise filter 34 and the inner diameter d1 of the connection pipe 32 have the relationship of the following formula (1).
0.025d1≤d2≤0.25d1 (1)
Preferably, the inner diameter d2 of the hole 34a of the noise filter 34 has a relationship of the following formula (2) with the inner diameter d1 of the connection tube 32.
0.1d1≤d2≤0.15d1 (2)
More preferably, the inner diameter d2 of the hole 34a of the noise filter 34 and the inner diameter d1 of the connection pipe 32 have the relationship of the following formula (3).
d2＝0.125d1 (3)
The distance L between the noise filter 34 and the pressure sensor 33 has the relationship of the following equation (4).
L≥4d1 (4)
[ Effect of the present embodiment ]
(1) The respiration detection unit (respiration detection device) 31 of the first embodiment includes: a pressure sensor 33, the pressure sensor 33 detecting a pressure change of the oxygen concentrated gas supplied to the flow path 15, the flow path 15 connecting the oxygen concentrated gas generating unit 12 of the oxygen concentrating device 11 and the outlet 21a of the oxygen concentrated gas in the jacket 21; a connection pipe 32 which connects the supply channel 15 and the pressure sensor 33, and which allows the oxygen concentrated gas to flow from the supply channel 15 to the pressure sensor 33, and which connects the supply channel 15 and the pressure sensor 33 to each other; and a noise filter 34, the noise filter 34 being provided to the connection pipe 32 and reducing noise applied to the pressure of the oxygen enriched gas.
According to the respiration detection unit 31 having the above configuration, the noise applied to the pressure of the oxygen-enriched gas in the supply passage 15 can be reduced by the noise filter 34, and the pressure change of the oxygen-enriched gas can be accurately measured by the pressure sensor 33, whereby the respiration waveform of the patient can be accurately detected. Therefore, the state of the patient using the respiration waveform can be accurately determined, the change in the condition of the patient can be grasped, the use state of the oxygen concentrator 11 can be grasped, and the like.
(2) In the first embodiment described above, the hole 34a is formed in the noise filter 34, the hole 34a having the inner diameter d2 smaller than the inner diameter d1 of the connection pipe 32, and the oxygen concentrated gas is passed through. Thus, by passing the oxygen-concentrated gas through the holes 34a of the noise filter 34, noise can be reduced.
(3) In the first embodiment, as shown in the above formula (1), the inner diameter d2 of the hole 34a of the noise filter 34 is 0.025 times or more and 0.25 times or less the inner diameter d1 of the connection pipe 32. When the inner diameter d2 of the hole 34a is less than 0.025 times the inner diameter d1 of the connection tube 32, it is difficult for the oxygen-enriched gas to pass through the hole 34a, and thus it becomes difficult to measure the pressure change by the pressure sensor 33. When the inner diameter d2 of the hole 34a is greater than 0.25 times the inner diameter d1 of the connection tube 32, the effect of reducing noise becomes small. Therefore, by setting the inner diameter d2 of the hole 34a of the noise filter 34 to be 0.025 to 0.25 times the inner diameter d1 of the connection pipe 32, the pressure change can be measured by the pressure sensor 33 with reduced noise.
(4) In the first embodiment, as shown in the above equation (4), the distance L between the pressure sensor 33 and the noise filter 34 is set to be 4 times or more the inner diameter d1 of the connection pipe 32. The reason for this is as follows. If the oxygen enriched gas passes through the holes 34a of the noise filter 34, the flow may be somewhat turbulent. If the distance between the pressure sensor 33 and the noise filter 34 is less than 4 times the inner diameter d1 of the connection pipe 32, the turbulence of the flow of the oxygen enriched gas caused by the hole 34a may affect the measurement value of the pressure sensor 33. As described above, by setting the distance L between the pressure sensor 33 and the noise filter 34 to be 4 times or more the inner diameter d1 of the connection pipe 32, it is possible to suppress the influence of the turbulence of the flow of the oxygen enriched gas passing through the hole 34a of the noise filter 34 on the measurement value of the pressure sensor 33.
(5) In the first embodiment described above, the oxygen concentrator 11 includes: a discharge unit 14 for discharging the oxygen-concentrated gas to the outside of the oxygen concentrator 11; and a flow rate adjusting section 13 for adjusting the flow rate of the oxygen-concentrated gas in a supply passage 15 between the generating section 12 and the discharging section 14. In this way, when the oxygen concentrator 11 includes the flow rate adjuster 13, the flow path is narrowed or enlarged in order to adjust the flow rate of the oxygen concentrated gas, and therefore, noise is likely to be generated in the flow of the oxygen concentrated gas, and noise of pressure is also likely to be generated. Therefore, it is more effective to have such a noise filter 34 as described above.
(6) The oxygen concentrator 11 of the first embodiment includes: a generation unit 12 that generates oxygen-concentrated gas in the generation unit 12; a discharge unit 14 for discharging the oxygen-concentrated gas generated in the generation unit 12 by the discharge unit 14; and a respiration detection unit 31, wherein a connection pipe 32 of the respiration detection unit 31 is connected to a supply passage 15 of the oxygen-enriched gas, and the supply passage 15 connects the generation unit 12 and the discharge unit 14. Thus, the respiration detector 31 can be incorporated in the oxygen concentrator 11, and the respiration state of the patient detected by the pressure sensor 33 can be managed in association with the operating state of the oxygen concentrator 11.
[ modified example of expiration detection device ]
Fig. 3 is a schematic cross-sectional view showing a modification of the breath detection device.
The difference from the one shown in fig. 2 is that the noise filter 34 of the respiration detection device 31 has an expansion chamber 34b, and the inner diameter d3 of the expansion chamber 34b is larger than the inner diameter d1 of the connection pipe 32.
In the case of the noise filter 34, the oxygen-concentrated gas flowing from the supply passage 15 into the connection pipe 32 enters the expansion chamber 34b, so that the pressure vibration is reduced, and the detection of noise by the pressure sensor 33 can be suppressed.
[ second embodiment ]
Fig. 4 is a schematic diagram showing a respiration detection device and an oxygen concentration device according to a second embodiment.
The respiration detection device 31 of the present embodiment is configured separately from the oxygen concentration device 11, and is externally attached to the oxygen concentration device 11.
The respiration detection device 31 includes a noise filter 34, a pressure sensor 33, a connection pipe 32, and a control unit 35. These components are disposed within the housing 36. One end of the connection pipe 32 is connected to the discharge part 14 of the oxygen concentrator 11 and the sleeve 21 via a joint member 37.
The structures of the noise filter 34, the pressure sensor 33, and the connection pipe 32 are the same as those of the first embodiment. The control unit 35 is constituted by a microcomputer including an arithmetic unit such as a CPU and a memory such as a RAM or a ROM. The control unit 35 controls the operation of the pressure sensor 33 and the like by the CPU executing a control operation program stored in the memory. The control unit 35 has a function of acquiring the measurement value of the pressure sensor 33 and storing the measurement value in the memory as information of the respiration waveform, among the functions of the control unit 16 according to the first embodiment. The control unit 35 also has a function of outputting information stored in the memory.
Fig. 5 is an explanatory diagram showing a pipe connection portion of the breath detection device.
For example, as illustrated in fig. 5, one end of the joint member 37 is connected to the discharge portion 14 of the oxygen concentrator 11. The other end of the joint member 37 is connected to an end of the connection pipe 32 and the inlet 21c of the sleeve 21. A branch flow path branched from the discharge portion 14 to the connection pipe 32 and the sleeve 21 is formed inside the joint member 37. Therefore, the connection pipe 32 is connected to the supply flow path of the oxygen-concentrated gas between the discharge portion 14 of the oxygen concentrator 11 and the discharge port 21a (see fig. 4) of the jacket 21.
In the respiration detection device 31 of the second embodiment, since the connection tube 32 is connected to the supply flow path of the oxygen-concentrated gas between the discharge portion 14 and the discharge port 21a of the sleeve 21, the respiration detection device 31 can be attached to the outside of the oxygen concentration device 11. Therefore, the respiration detection function can be added to the oxygen concentrator 11 having no respiration detection function.
The present disclosure is not limited to the description of the above embodiments, which are shown by the claims, and includes meanings equivalent to the claims and all changes within the scope thereof.
For example, although the condenser microphone is used as the pressure sensor 33 in the above embodiment, another pressure sensor such as a diaphragm type may be used as long as it can detect the respiration waveform of the patient. However, since the diaphragm type pressure sensor needs to be large in size because the reference pressure needs to be stabilized, it is more preferable to use the condenser microphone as in the above-described embodiment.
Description of the symbols
11: an oxygen concentration device;
12: a generation section;
13: a flow rate adjusting section;
14: a discharge unit;
15: a supply flow path;
21: a sleeve;
21 a: an outlet port;
21 b: a supply flow path;
31: a respiration detection device (respiration detection unit);
32: a connecting pipe;
33: a pressure sensor;
34: a noise filter;
34 a: an aperture;
34 b: an expansion chamber;
l: a distance;
d 1: an inner diameter;
d 2: outer diameter.
Claims (8)
1. A breath detection device, comprising:
a pressure sensor (33), wherein the pressure sensor (33) is used for detecting the pressure change of the oxygen concentrated gas in the supply flow paths (15, 21b), and the supply flow paths (15, 21b) are connected with the oxygen concentrated gas generation part (12) in the oxygen concentration device (11) and the discharge port (21a) of the oxygen concentrated gas in the sleeve (21);
a connection pipe (32) that connects the supply channel (15, 21b) and the pressure sensor (33), and that allows the oxygen-concentrated gas to flow from the supply channel (15, 21b) to the pressure sensor (33); and
a noise filter (34), the noise filter (34) being disposed at the connection pipe (32) and reducing noise applied to the pressure of the oxygen enriched gas.
2. The respiration detection apparatus of claim 1,
a hole (34a) is formed on the noise filter (34), the hole (34a) having an inner diameter (d2) smaller than an inner diameter (d1) of the connection pipe (32), and oxygen-concentrated gas is passed through the hole (34 a).
3. The respiration detection apparatus of claim 2,
the inner diameter (d2) of the hole (34a) is 0.025-0.25 times the inner diameter (d1) of the connection pipe (32).
4. The respiration detection apparatus of claim 2 or claim 3,
the distance (L) between the pressure sensor (33) and the noise filter (34) is four times or more the inner diameter (d1) of the connection pipe (32).
5. The respiration detection apparatus of claim 1,
the noise filter (34) has an expansion chamber having an inner diameter larger than that of the connection pipe, and passes oxygen therethrough.
6. The respiration detection apparatus of any one of claims 1 to 5,
the oxygen concentration device (11) comprises: a discharge unit (14) for discharging the oxygen-concentrated gas to the outside of the oxygen concentration device (11); and a flow rate adjustment unit (13) that adjusts the flow rate of the oxygen-enriched gas in a supply flow path (15) between the generation unit (12) and the discharge unit (14).
7. The respiration detection apparatus of any one of claims 1 to 6,
the oxygen concentrator (11) has a discharge unit (14) for discharging oxygen to the outside of the oxygen concentrator (11), and the connection pipe (32) is connected to a supply flow path of oxygen-concentrated gas between the discharge unit (14) and the discharge port (21a) of the sleeve (21).
8. An oxygen concentrator, comprising:
a generation unit (12), wherein the generation unit (12) generates oxygen-concentrated gas;
a discharge unit (14) that discharges the oxygen-concentrated gas generated in the generation unit (12) by the discharge unit (14); and
the respiration detection device (31) of any one of claims 1 to 6,
a connection pipe (32) of the respiration detection device (31) is connected to a supply channel (15) for oxygen-enriched gas, and the supply channel (15) connects the generation unit (12) and the discharge unit (14).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019177090A JP7343762B2 (en) | 2019-09-27 | 2019-09-27 | Breathing detection device and oxygen concentrator |
| JP2019-177090 | 2019-09-27 |
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| CN112568894A true CN112568894A (en) | 2021-03-30 |
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| CN202011021939.8A Pending CN112568894A (en) | 2019-09-27 | 2020-09-25 | Respiration detection device and oxygen concentration device |
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| CN (1) | CN112568894A (en) |
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| JP2021052911A (en) | 2021-04-08 |
| JP7343762B2 (en) | 2023-09-13 |
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