JP5570853B2 - Ventilator - Google Patents

Description

  The present invention relates to an artificial respiration apparatus provided with a carbon dioxide concentration sensor.

  Conventionally, a ventilator has a function of generating an alarm by detecting a patient's non-ventilated or hypoventilated state due to malfunction of a ventilator or abnormality of a breathing circuit. In particular, monitoring of end-tidal CO2 (End-tidal CO2: EtCO2) is useful because it can confirm that the patient is actually exchanging gas.

  The EtCO2 measuring mechanism mounted on the current ventilator or the EtCO2 measuring mechanism in a patient monitoring device different from the ventilator has a configuration shown in FIG.

  The apparatus shown in FIG. 4 is a conventional artificial respiration apparatus, and is configured as follows. That is, the ventilator 80 is connected to the respiratory system of the patient A through the intake valve 82, which is a one-way valve, the infection prevention filter 86, the warming humidifier 87, the water trap 88, and the breathing circuit 81, and The respiratory system of the patient A is connected to the exhaust pipe 91 of the ventilator 80 via a breathing circuit 81, a water trap 89, an infection prevention filter 90, and an exhalation valve 83 which is a one-way valve. The breathing gas is sent from the device 80 to the patient via the inhalation valve 82, and the exhalation gas of the patient is discharged from the exhaust port 91A to the outside via the exhalation valve 83 and the exhaust pipe 91.

  In this artificial respiration apparatus, a carbon dioxide concentration sensor 84 is provided at a position close to the mouth of the patient A, and the patient A's gas exchange status is monitored by measuring the EtCO 2 of the patient A. Devices and instruments between the patient A and the ventilator 80, including the carbon dioxide concentration sensor 84, that is, the infection prevention filters 86 and 90, the warming humidifier 87, the water traps 88 and 89, and the breathing circuit 81 Is configured to be easily detachable in order to allow replacement, sterilization, or replacement for each patient (see, for example, FIG. 1 of Patent Document 1).

  The ventilator 80 includes a power supply unit 85 that supplies power to each part of the ventilator 80, and the power supply unit 85 supplies the carbon dioxide concentration sensor 84 with necessary power. Some simple ventilators that are operated manually or by a separate pressure source or the like do not include a power supply unit.

  Furthermore, as an artificial respiration device that detects the carbon dioxide concentration by the side stream method, a carbon dioxide concentration detector connected through a sampling tube from the middle of the exhalation circuit upstream of the exhalation valve, and an inhalation circuit An artificial respirator is known that calculates the amount of carbon dioxide gas from a flow meter (see Patent Document 2).

Japanese Utility Model Publication No. 6-20535 JP 2002-11100 A

  As described above, the device described in FIG. 4 or Patent Document 1 has many portions that can be easily attached and detached between the ventilator 80 and the patient A, and the probability that the connecting portion is detached increases accordingly. In particular, disconnection of the inspiratory circuit portion can have a significant impact on the patient. Therefore, the carbon dioxide concentration sensor 84 and the like are securely attached so as not to cause patient ventilation failure due to disconnection of each connection, alarm malfunction due to sensor disconnection and patient ventilation failure associated therewith. It is necessary to confirm this, and there is a problem that it is extremely troublesome.

  Further, since the breathing gas is humidified by the warming humidifier 87 and the carbon dioxide concentration sensor 84 is installed at a position close to the mouth of the patient A, dew condensation easily occurs in the circuit near the carbon dioxide concentration sensor 84. If condensation occurs, it becomes difficult to normally detect the carbon dioxide concentration by the carbon dioxide concentration sensor 84, which may cause a malfunction such as an alarm.

  Further, when the patient is breathing spontaneously and the exhalation circuit of the breathing circuit 81 (for example, the connection part of the infection prevention filter 90) is disconnected, and the inhalation circuit of the breathing circuit 81 (for example, the connection part of the infection prevention filter 86). However, since the carbon dioxide concentration sensor 84 detects carbon dioxide due to the patient's spontaneous breathing, the carbon dioxide concentration sensor 84 cannot detect the above-described deviation. Also, if the patient is not breathing spontaneously, if the inspiratory circuit is disconnected, breathing gas can no longer be supplied, so the detected value of the carbon dioxide concentration sensor 84 becomes abnormal and can be detected as being in an abnormal state. If the exhalation circuit is disconnected, the disconnection may not be detected depending on the disconnected location. That is, if the removed part is close to the exhalation valve 83, the duct resistance of the exhalation circuit is large, thereby sending respiratory gas to the patient, and carbon dioxide concentration sensor 84 detects carbon dioxide. Missing may not be detected.

  In this specification, “displacement can be detected” means that the carbon dioxide concentration detected by the carbon dioxide concentration sensor is not normal when the disengagement occurs, and the disengaged portion cannot necessarily be identified. Absent. Further, “cannot detect detachment” means that the carbon dioxide concentration detected by the carbon dioxide concentration sensor does not become abnormal.

  Furthermore, since the apparatus shown in FIG. 4 supplies power to the ventilator 80 and the carbon dioxide concentration sensor 84 from a single power supply unit 85, if the power supply unit 85 fails, the ventilator The carbon dioxide concentration sensor 84 does not work at the same time that the 80 is not operated, so that no alarm is generated and the abnormality cannot be known. A simple ventilator that does not include the power supply unit usually does not have a function of monitoring the carbon dioxide concentration.

  The apparatus described in Patent Document 2 has a carbon dioxide gas concentration detector connected to the exhalation circuit side, but an exhalation gas sampling tube is connected upstream of the exhalation valve, and the sampling tube and carbon dioxide concentration detection In order to enable replacement, sterilization, or replacement for each patient, the device needs to be configured to be easily detachable. For this reason, a carbon dioxide concentration detector etc. was securely installed so as not to cause the patient's poor ventilation due to the disconnection of each connection, the malfunction of the alarm due to the disconnection of the sensor, and the accompanying patient's poor ventilation. It is necessary to confirm that it is in a state, and there is a problem that it is extremely troublesome.

  The present invention has been made in view of the current state of the artificial respiration apparatus as described above. The purpose of the present invention is to reduce the number of easily detachable parts to reduce the time required for inspection of the connection part, and It is an object of the present invention to provide an artificial respiration apparatus that increases the safety by reducing the probability of disconnection.

  Moreover, the objective of this invention is providing the artificial respiration apparatus which reduced the influence of the dew condensation with respect to a carbon dioxide concentration sensor.

  Furthermore, an object of the present invention is to provide artificial respiration so that it is possible to detect the disconnection of the breathing circuit not only when there is no spontaneous breathing but also when there is spontaneous breathing, and furthermore, it is possible to identify the location where the breathing has deviated. Is to provide a device.

  Furthermore, the object of the present invention is to operate the carbon dioxide concentration sensor even in a ventilator that is not equipped with a power supply unit or a carbon dioxide concentration sensor, even if power is not supplied to the ventilator for some reason. It is an object of the present invention to provide an artificial respiration apparatus capable of knowing an abnormality when an alarm is generated when necessary. In addition, an object of the present invention is to provide an artificial respirator that can analyze in detail the state of a device including a breathing circuit and the state of a patient.

A ventilator according to the present invention includes a communication unit that communicates with a patient's respiratory system, an intake circuit that is a flow path for flowing gas from the ventilator to the communication unit, and gas exhausted from the communication unit. and expiration circuit is a flow path leading to the ventilator exhaust pipe, and exhalation valve for blocking the flow to the connecting portion side from the exhaust pipe, a circuit downstream of the exhalation valve, in the exhaust pipe A carbon dioxide concentration sensor that is provided at an exhaust port outside the ventilator, detects a carbon dioxide concentration, an alarm output means that outputs an alarm based on the output of the carbon dioxide concentration sensor, and power to the ventilator A first power supply unit for supplying power and a second power supply unit dedicated for supplying power to the carbon dioxide concentration sensor and the alarm output means are provided.

  In the ventilator according to the present invention, the alarm output means obtains at least one of device information of the ventilator and biological information of the patient, and based on the obtained information and the output of the carbon dioxide concentration sensor. It is characterized by comprising state determination means for determining whether or not at least one of the apparatus state and the patient state is abnormal.

  According to the present invention, since the carbon dioxide concentration sensor for detecting the carbon dioxide concentration is provided in the circuit downstream from the exhalation valve, even if the carbon dioxide concentration sensor becomes contaminated, Since contamination is prevented, the frequency of sterilization and replacement of the carbon dioxide concentration sensor is significantly reduced. This makes it possible to attach the carbon dioxide concentration sensor firmly, eliminating the need to check the attachment state of the carbon dioxide concentration sensor and reducing the inspection work for the connection between the ventilator and the patient. In addition, it is possible to increase the safety by reducing the probability of disconnection of the connecting portion.

  According to the present invention, since the carbon dioxide concentration sensor is provided in the circuit downstream from the exhalation valve, it is far from the moisture generation source (heating humidifier, patient, etc.) and there is almost no condensation. Therefore, it is possible to detect an accurate carbon dioxide concentration.

  According to the present invention, since the carbon dioxide concentration sensor is provided in the circuit downstream from the exhalation valve, the exhalation circuit of the breathing circuit upstream of the carbon dioxide concentration sensor is disconnected while the patient is breathing spontaneously. In this case, since the exhalation of the patient does not normally reach the carbon dioxide concentration sensor, it is possible to detect the disconnection of the exhalation circuit. If the inspiratory circuit is disconnected while the patient is breathing spontaneously, the detachment may be detected depending on the location where the patient has disconnected. That is, if the deviated location is downstream of the inspiratory circuit (the side closer to the patient), the patient's exhalation leaks from the deviated location and does not reach the carbon dioxide concentration sensor. Abnormality can be detected to detect the disconnection of the intake circuit. If the patient's breathing circuit is disconnected while the patient is not breathing spontaneously, the breathing gas will not reach the carbon dioxide concentration sensor regardless of where it is removed, and the detected value of the carbon dioxide concentration sensor is abnormal. When the breathing circuit is disconnected, the breathing gas is not sent to the patient, and the detected value of the carbon dioxide concentration sensor becomes abnormal. It can be detected.

  According to the present invention, since the dedicated power supply unit for supplying power to the carbon dioxide concentration sensor and the alarm output means is provided, even if power supply to the ventilator is not performed due to some cause, or the carbon dioxide concentration If the ventilator is not equipped with a sensor, it can be retrofitted so that the carbon dioxide concentration sensor operates and an alarm is generated when necessary so that an abnormality can be known.

  According to the present invention, since the carbon dioxide concentration sensor is provided at the exhaust port of the exhaust pipe, the exhalation circuit of the breathing circuit on the upstream side of the carbon dioxide concentration sensor can be removed regardless of whether the patient spontaneously breathes. Since it is possible to detect, almost all exhalation circuits can be detected. In addition, since there is not much space limitation, the carbon dioxide concentration sensor can be attached relatively easily even after retrofitting.

  According to the present invention, at least one of the device information of the artificial respiration device and the biological information of the patient is obtained, and at least one of the device state and the patient state based on the obtained information and the output of the carbon dioxide concentration sensor. Therefore, it is possible to obtain the device state and the patient state, and to perform more stable device operation management and patient monitoring.

The block diagram which shows the structure of 1st Embodiment in the artificial respiration apparatus which concerns on this invention. The block diagram which shows the principal part structure of the artificial respiration apparatus which concerns on this invention. The block diagram which shows the principal part structure of the artificial respiration apparatus which concerns on this invention. The block diagram which shows the structure of the artificial respiration apparatus which concerns on a prior art example. The block diagram which shows the structure of 2nd Embodiment in the artificial respiration apparatus which concerns on this invention. The figure which shows the carbon dioxide concentration waveform and airway pressure waveform at the time of the disconnection of the inhalation circuit obtained in 2nd Embodiment in the artificial respiration apparatus which concerns on this invention. The figure which shows the carbon dioxide concentration waveform and the airway pressure waveform at the time of the disconnection of the expiration circuit obtained in 2nd Embodiment in the artificial respiration apparatus which concerns on this invention. The figure which shows the carbon dioxide concentration waveform when the slack of the water trap obtained in 2nd Embodiment in the artificial respiration apparatus which concerns on this invention arises, and the airway pressure waveform obtained in this embodiment.

  Embodiments of a ventilator according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals and redundant description is omitted. FIG. 1 shows the configuration of the artificial respiration apparatus according to the first embodiment. The artificial respiration apparatus includes a ventilator 10 that delivers a gas having a required oxygen concentration for artificial respiration at a required pressure.

  A communication unit 11 communicating with the respiratory system is attached to the respiratory system of the patient A. The communication part 11 is comprised by the mask or the conduit | pipe etc. which are intubated. The gas outlet 10 </ b> A of the ventilator 10 and the communication unit 11 are connected by an intake circuit 12 that is a flow path for flowing gas from the ventilator 10 to the communication unit 11. An infection prevention filter 40 is installed in the vicinity of the outlet 10A, and a heating / humidifier 41 that humidifies the artificial respiration gas at an appropriate location and a water trap that captures surplus moisture of the artificial respiration gas. 42 is installed.

  Further, the gas inlet 10 </ b> B of the ventilator 10 and the communication unit 11 are connected by an exhalation circuit 13 that is a flow path for guiding the gas exhausted from the communication unit 11 to the exhaust pipe 17 of the ventilator 10. In the exhalation circuit 13, an infection prevention filter 43 for capturing bacteria is installed in the vicinity of the gas inlet 10B, and a water trap 44 for capturing moisture of the exhaust gas is installed at an appropriate location.

  The ventilator 10 is provided with an intake side one-way valve 14 in the vicinity of the gas outlet 10A. The inspiratory side one-way valve 14 has a function of allowing only the gas flow from the ventilator 10 to the communication unit 11 and blocking the flow from the communication unit 11 side.

  The ventilator 10 is provided with an exhalation-side one-way valve 15 in the vicinity of the gas inlet 10B. The exhalation-side one-way valve 15 has a function of allowing only a gas flow from the communication unit 11 toward the ventilator 10 and blocking the flow toward the communication unit 11. The inhalation-side one-way valve 14 and the exhalation-side one-way valve 15 cooperate to participate in an artificial respiration operation for the patient A of the ventilator 10.

  A carbon dioxide concentration sensor 16 is provided in a circuit downstream from the exhalation-side one-way valve 15. Specifically, a carbon dioxide concentration sensor 16 is provided at a position near the exhaust port 17A in the exhaust pipe 17 that communicates from the exhalation-side one-way valve 15 to the atmosphere. The position of the carbon dioxide concentration sensor 16 may be outside or inside the ventilator 10.

  Further, the carbon dioxide concentration sensor 16 is firmly fixed to the exhaust pipe 17, and is configured without any possibility of circuit disconnection. If the carbon dioxide concentration sensor 16 is attached to the exhaust port 17A outside the ventilator 10, it is not subject to much restrictions on the installation space, so that it can be retrofitted to an existing ventilator relatively easily. Become.

  The ventilator 10 is provided with a power supply unit 21 (first power supply unit). The power supply unit 21 receives power supply from an external power supply (for example, an emergency backup power supply) 20 and converts it into a required voltage. Power is supplied to the necessary circuits. Further, the artificial respiration apparatus has a power supply unit (second power supply unit) 22 for the sensor, receives power supply from the external power supply 20, converts it to a required voltage, and supplies power to the carbon dioxide concentration sensor 16. ing.

  The power supply unit 22 is provided in the monitoring device unit 30, and the monitoring device unit 30 includes a controller 31 that is an alarm output unit, a speaker 32, and a display device 33 such as an LED. The controller 31, the speaker 32, and the display device 33 operate by receiving power supply from the power supply unit 22. The controller 31, the speaker 32, and the display device 33 output an alarm based on the output of the carbon dioxide concentration sensor 16. The controller 31 may be configured to display EtCO2 on the display 33 based on the output of the carbon dioxide concentration sensor 16 at normal times.

  As shown in FIG. 2, the carbon dioxide concentration sensor 16 may be provided in the exhaust pipe 17, and may be a main stream system connected to the monitoring device unit 30 by a signal line 17a or a power line 17b.

  Further, the carbon dioxide concentration sensor 16 is provided in the monitoring device unit 30 as shown in FIG. 3, and the exhaled gas is guided to the carbon dioxide concentration sensor 16 from the branch pipe 38 coupled to the exhaust pipe 17 through the sampling tube 39. The side stream method can be used.

  2 and 3, the monitoring device unit 30 is provided outside the ventilator 10, but may be provided inside the ventilator 10.

  In the ventilator configured as described above, the operation of the ventilator 10 and the monitoring device unit 30 is started by turning on the power, and the gas supply from the ventilator 10 to the patient A and the exhalation gas exhalation circuit 13. It is discharged through. At this time, the carbon dioxide concentration is detected by the carbon dioxide concentration sensor 16 and displayed on the display 33. When a circuit disconnection occurs in the inspiratory circuit 12 or the expiratory circuit 13, a large change occurs in the carbon dioxide concentration detected by the carbon dioxide concentration sensor 16 provided at the end of the circuit. For example, an alarm is output from the speaker 32 and the display 33. Therefore, even if it is out of the circuit at any position, this can be easily detected and the safety is high.

  Since the carbon dioxide concentration sensor 16 is firmly attached to the exhaust pipe 17, there is no sensor detachment and safety is high. Further, even if the components including the carbon dioxide concentration sensor 16 and the sampling tube 39 are contaminated by the exhalation of the patient, these components are downstream of the infection prevention filter 43 and the exhalation-side one-way valve 15, and therefore the contaminated gas. Etc. do not flow to the communication section 11 side, and it is possible to realize maintenance-free operation that eliminates the need for replacement and sterilization of components including the carbon dioxide concentration sensor 16 and the sampling tube 39, and is free from the troublesomeness of replacement and sterilization. Reduction can be achieved.

  Furthermore, since the power supply unit 22 is different from the power supply unit 21 of the ventilator 10 and supplies power to the carbon dioxide concentration sensor 16 and outputs an alarm when necessary, the power supply unit 21 of the ventilator 10 has an abnormality. Even when it occurs, the carbon dioxide concentration sensor 16 is operating, and it is possible to reliably detect an abnormality and output an alarm from the speaker 32 and the display device 33 to notify the abnormality. Is secured.

  FIG. 5 shows the configuration of the artificial respiration apparatus according to the second embodiment. In this ventilator, the ventilator 110 includes a control unit 25. The control unit 25 controls the operation of the device based on the biological information of the patient A and the device information of the device, monitors the patient A and the device, displays necessary parameters, and displays abnormal conditions. In this case, an alarm is issued in the same manner as before. Here, the biological information refers to information related to the living body such as arterial blood oxygen saturation, blood pressure, body temperature, respiratory rate, airway pressure, etc. In FIG. Only the pressure sensor 26 provided is shown.

  In addition, the device information of the device is information on the operation of the ventilator 110, information on the pressure and temperature in the breathing circuit, information on the output voltage and current of the power supply unit 21, and all other information on the device. Although this includes time and the like, these pieces of device information are not shown in FIG.

  In the present embodiment, the airway pressure information of the patient A is given from the control unit 25 of the ventilator 110 to the controller 131 of the monitoring device unit 130. Further, the carbon dioxide concentration information is given to the controller 131 from the carbon dioxide concentration sensor 16. The controller 131 determines whether the apparatus state and the patient state are normal based on the airway pressure information and the carbon dioxide concentration information. Then, the determination result is displayed on the display device 33 which is a display means. Further, when the determination result is abnormal, an alarm is output using the speaker 32.

  In the above description, the control unit 25 operates with power supplied from the power supply unit 21, and the controller 131 operates with power supplied from the power supply unit 22. Other configurations of the artificial respiration apparatus according to the second embodiment are the same as those of the apparatus according to the first embodiment.

  By the artificial respiration apparatus configured as described above, the apparatus state and the patient state are monitored as follows. The carbon dioxide concentration sent from the carbon dioxide concentration sensor 16 and the airway pressure sent from the pressure sensor 26 are regularly adjusted according to the breathing motion of the patient A (the motion of the ventilator 110 when the patient A is not spontaneously breathing). If it has changed, the controller 131 determines that the apparatus state and the patient state are normal, and displays this on the display 33. When the carbon dioxide concentration and / or the airway pressure shows an abnormality as will be described in detail below, the controller 131 determines the abnormal state, displays that fact on the display 33, and from the speaker 32 as necessary. Output an alarm.

  Next, the estimation of the detachment location based on the carbon dioxide concentration and the airway pressure when the evacuation of the inspiratory circuit 12 and the expiratory circuit 13 occurs will be described. In the following description, the case where the above-mentioned detachment occurs alone will be described, but the carbon dioxide concentration and the airway pressure may also be generated even when an abnormality other than the above occurs or a plurality of abnormalities including the above-mentioned detachment occur in combination. May show the same tendency, the following “detection of detachment” is an estimation that the part may be detached.

  FIG. 6 shows the waveforms of the carbon dioxide concentration (a) and the airway pressure (b) in the case where the inspiration circuit 12 is released, and in FIG. 7, the case where the expiration circuit 13 is released. ing. The horizontal axis of each graph shows the elapsed time. In this case, as shown by the circles enclosed in FIGS. 6A and 7A, the carbon dioxide concentration is stopped because the rectangular wave due to respiration is disturbed. FIG. 6A and FIG. 7A show examples of measurement results, and such a waveform does not always occur, but in both cases, disturbance and stop of a rectangular wave are recognized. However, it is not possible to specify at which location the defect occurs only with these waveforms.

  On the other hand, when the airway pressure is released in the intake circuit 12, the rectangular wave stops and transitions to a flat waveform as indicated by the circle enclosed in FIG. On the other hand, when the disconnection occurs in the exhalation circuit 13, the amplitude (P-P value) of the rectangular wave becomes a small waveform as shown by the circle surrounded by FIG. This is because the airway pressure changes due to the duct resistance of the exhalation circuit 13.

  The controller 131 uses the airway pressure and the carbon dioxide concentration, which are obtained information, to specify whether the deviated portion is the inspiratory circuit 12 or the expiratory circuit 13. For example, a decrease in the carbon dioxide concentration below a predetermined threshold value and a decrease in the airway pressure to a predetermined value or less and the absence of a pulse at the decreased portion are detected, and it is determined that the outflow portion is the intake circuit 12. Further, when the carbon dioxide concentration is below a predetermined threshold value and a pulse with an amplitude (P-P value) below a predetermined value is detected at a lowering or lowering portion of the airway pressure below the predetermined value, Judge that there is.

  Next, the case where gas leakage has occurred due to the looseness of the connection part of the water trap 44 of the expiratory circuit 13 will be described. FIG. 8 shows waveforms of carbon dioxide concentration (a) and airway pressure (b). The horizontal axis of each graph shows the elapsed time. In this case, the carbon dioxide concentration has a waveform in which a rectangular wave due to respiration is disturbed and remains at a low level, as indicated by a circle surrounded by FIG. Only with this carbon dioxide concentration waveform, it is difficult to identify where in the breathing circuit a malfunction has occurred.

  On the other hand, the airway pressure has a waveform having an amplitude (P-P value) about half that in the normal state, as shown by the circle surrounded by FIG. The controller 131 has an amplitude (P-P value) of this waveform within a predetermined range, and the carbon dioxide concentration waveform is below a predetermined threshold value as shown by a circle surrounded by FIG. , It is determined that there is a leak in the exhalation circuit 13.

  As understood from FIGS. 7 and 8 above, the amplitude (P-P value) of the airway pressure when the expiration circuit 13 is abnormal is small when the expiration circuit 13 is disconnected, and the amplitude of the connection part of the water trap 44 is small. Gas leaks are often caused by looseness. Therefore, the degree of abnormality can be estimated based on the magnitude of the airway pressure (PP value).

  Any of the following parameters can be used instead of the airway pressure. Inspiratory volume and expiratory volume per breath, inspiratory peak flow and expiratory peak flow per breath, and lung compliance.

  In the second embodiment, the location where the breathing circuit is out of place is specified based on the carbon dioxide concentration and the airway pressure, but the following information can be obtained based on the carbon dioxide concentration and the following parameters. it can. When the carbon dioxide concentration detected by the carbon dioxide concentration sensor 16 shows an abnormal value, it is possible to determine whether the operation is an accident or an intentional operation based on the information about the temporary alarm release, and an erroneous alarm can be prevented.

  When the carbon dioxide concentration shows an abnormal value, lung compliance is normal, and if the alarm is not temporarily released, it is estimated that esophageal intubation occurs. Instead of the above-described lung compliance, the lung compliance can be calculated and used from the inspiratory amount and the expiratory amount per breath, the inspiratory peak flow rate and the expiratory peak flow amount per breath, and the airway pressure.

  As described above, the device state and the patient state can be obtained by using the carbon dioxide concentration sensor and at least one of the device information of the device and the biological information of the patient, so that more stable device operation management and patient monitoring can be performed. Is possible.

DESCRIPTION OF SYMBOLS 10 Ventilator 11 Communication part 12 Inhalation circuit 13 Exhalation circuit 14 Inhalation valve 15 Exhalation valve 16 Carbon dioxide concentration sensor 17 Exhaust pipe 17A Exhaust port 21, 22 Power supply part 26 Pressure sensor 31, 131 Controller A Patient

Claims (2)

A liaison that communicates with the patient's respiratory system;
An intake circuit that is a flow path for flowing gas from the ventilator to the communication part;
An exhalation circuit which is a flow path for guiding the gas exhausted from the communication part to the exhaust pipe of the ventilator;
An exhalation valve that blocks the flow from the exhaust pipe to the communication unit;
A circuit downstream of the exhalation valve, provided at an exhaust port outside the ventilator in the exhaust pipe , and a carbon dioxide concentration sensor for detecting a carbon dioxide concentration;
Alarm output means for outputting an alarm based on the output of the carbon dioxide concentration sensor;
A first power supply for supplying power to the ventilator;
An artificial respiration apparatus comprising: the carbon dioxide concentration sensor; and a dedicated second power supply for supplying power to the alarm output means. The alarm output means obtains at least one of the device information of the artificial respiration device and the biological information of the patient, and at least one of the device state and the patient state based on the obtained information and the output of the carbon dioxide concentration sensor. The artificial respiration apparatus according to claim 1, further comprising state determination means for determining whether or not the state is abnormal .

Images