1. The Acoma medical department industrial share type company
ART-21 (Figure ; Outward appearance photograph of ART21)
1. The characteristic
In that the resuscitator which is made overseas becomes mainstream, the Acoma medical department industry is the male of the domestic manufacturer who continues to take out a continuously enthusiastic product. Of the manufacturer who developed PSV built-in machine first, being domestic however, there is an Acoma medical department industry. In ART-21, plainly, it is the design which had a knowledge of the pot of the resuscitator to use a graduate-acting control valve for the intake and expiration gas control, to be equipped with the intake and expiration flow measurement and to adopt a monolithic exhalation-valve unit, and so on. The design of the rather simple operation and ART-21's being simple, not pursuing the multifunction which is unnecessary in vain by the design to have investigated the request of the market is a characteristic.
2. The performance
1) The mode that it is possible to use
VCV
PCV
SIMV(Volume Control)+PSV
CPAP, PSV
---------------------------------
+PEEP
The anaerosis back-up (The SIMV, CPAP, PSV mode)
SIGH
The nebulizer
2) This proximal dater
The maximum intake gas flow rate
The active-ventilation .80 LPM
PSV. .120 LPM
The number of the maximum active-ventilations .60 BPM
The maximum SIMV number of times .60 BPM
3. The control circuit, the controlling mechanism
1) The outline of the controlling mechanism
(1) General 8bitCPU is used for each of being mainly, (2) gas reservoir control, the operation and the display of the (3) front panel, (4) circuit internal pressure bargraph display.
2) The characteristic of the mechanical mechanism
The intake valve and the exhalation-valve use and are controlling a graduate-acting control valve with the actuator based on the intake and expiration pressure and flow information.
3) The gas flow rate measurement (Figure ; Structure of intake flownmeter of ART21)
A differential flow meter is together done by the internal organs on the side of intake and the side of the expiration.
4) The intake valve (Figure ; Induction system C-system of ART21)
As for each gas which entered from the inlet of air and oxygen, each Solenoid-controlled valve becomes on when the pressure in the gas reservoir reaches constant pressure and the coal-water-gas of oxygen and air is supplied to the gas reservoir. The pressure in the gas reservoir is composed of spring and the pressure is always maintained in the range of 90-110hPa. A flow rate is measured by the differential flow meter which is special respectively and air and oxygen are controlled for the oxygen concentration in the gas reservoir to be a front panel and to become a set oxygen concentration. An oxygen concentration in the gas reservoir is maintained in the precision within 5% of +-. In case of intake, a graduate-acting control valve is opened by the actuator and to become the intake flow rate which was calculated from the set value of the front panel, a graduate-acting control valve is done in the feed-back-control with the intake flownmeter and the rank experimental use computer London integrated display sensor. This graduate-acting control valve replies within about 10 ms with the signal from the CPU.
5) The expiration valve
An exhalation-valve unit is made about 40‹C by the heating to prevent a dewfall to expiration side-float Reims Dewe Sir. The diaphragm of the exhalation-valve is directly driven by the actuator based on the control signal of the CPU.
4. The new Mattick circuit (Figure ; New Mattick schematic of ART21)
The gas of the oxygen concentration which was set on the front panel by oxygen/air blender unit ‡D is composed of compressed air from the supplied plumbing or the air of special blown air "ART-21B" and oxygen and they can store up it in gas reservoir ‡E. At this time, the gas reservoir maintains the driving-pressure of about 100 hPa. It is controlling a flow by graduate-acting control valve ‡F to become the intake flow rate which was computed from each set value on the front panel. A servo is controlled for the flow who creates with the graduate-acting control valve to measure always by intake flownmeter ‡G and to become a right intake flow rate. In case of intake, exhalation-valve actuator ‡M blockades a circuit in about 70 hPa. This exhalation-valve actuator combines a feature as the positive pressure relief valve and the function to keep a setting PEEP level in case of the expiration. In case of the expiration, an exhalation-valve actuator is opened and expiration gas from the patient is discharged from air exhaust ‡R to the atmosphere through expiration flownmeter ‡O. The expiration gas which was measured with the expiration flownmeter is displayed as the air quantity of ventilation of the measurement on the front panel.
5. The control software
The explanation of the each function
1) The trigger formula
It is a flow trigger formula. It is possible to set in the range of 3-15LPM. In the VCV, PCV mode, it is possible to make a trigger mechanism to be off. The base flow is trigger sensitivity + 5LPM.
2)VCV
It is the mode that it is possible to express with A/C(Volume), too. It sets only this mode from the I:E ratio. It is possible to set by 5% of carving in 0-30% of ranges in the intake plateau (EIP) time, too.
3)PCV
It is general PCV. It is possible to express with A/C(Pressure), too.
4)PSV
PSV ends when the intake gas flow rate falls to 10LPM.
5)SIMV
The trigger window of SIMV is 75% of the second half of the SIMV cycle time. It is limited to a maximum of 5 seconds.
6) The anaerosis back-up
It operates by the time and the CPAP mode to be established below 5BPM in SIMV. When there is an anaerosis in 30 seconds, the alarm sounds and back-up ventilation is done at the number of times of 5BPM.
7) The nebulizer
It does an auto-stop 30 minutes later. However, in nebulizer use, the air quantity of ventilation doesn't change.
8)SIGH
The setting of Sigh is 200% of the air quantity of ventilation with once, once to 100 pieces of breathing.
6. The operation system (Figure ; Operating panel of ART21)
It sets with the mode, the air changes per hour, the air quantity of ventilation (the ventilating-pressure), the I:E ratio (the intake time), PEEP, the oxygen concentration, the "WO" dial and it is fixed at the ENT button. The item (SIGH, the nebulizer, the intake plateau and so on) except it becomes on if it pushes the button (That the ENT button is fixed is unnecessary).
7. The monitor, the alarm function
Hereinafter, it is equipped with the alarm. It is automatically established at how many % of the actual measurement when pushing a quick setup button.
1) The low pressure alarm in the circuit
2) The circuit inland quantity pressure alarm
3) The expired volume per minute upper limit
4) The expired volume per minute minimum
5) The air quantity of ventilation upper limit
6) The air quantity of ventilation minimum
7) The anaerosis : The fixation in 30 seconds
8) The others : The power failure, the distributed-gas stop, doing setting bad and so on
8. The display feature
1) The airway pressure display
It chooses one while being a maximum, a plateau, an average, an expiration end and it puts on it with the digital display.
2) The air quantity of ventilation
It chooses one while being an air quantity of ventilation, an expired volume per minute, an air changes per hour once and it puts on it with the digital display.
9. The patient circuit composition, the humidifier (Figure ; Patient circuit of ART21)
The patient circuit uses "DEISUPO" circuit. A circuit owner-use is prepared. The humidifier is F&P. It comes equipped with the MR410 type.
10. The maintenance
After use, it cancels "DEISUPO" parts such as the patient circuit and the filter. It removes an exhalation-valve unit, it washes a diaphragm, a diaphragm hold in the resolution and it does an autoclave or alcohol sterilization. Always pull out water in the drain-cistern.
11. The regular inspection
It receives once in 1 or it receives regular inspection in 5000 hours by hour. It receives once in 2 or once, it receives an overhaul to 10000 hours. When not using in the extended period, it operates 3 months for 1 degree, equal to or more than 7 hours and it charges in the battery.
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12. The fault
1) The design of the operating panel, too, is the good design which the background information can be easily set to even if it is not. The control system and the flow measurement of intake and the expiration, too, are tight made, it is simple and the exhalation-valve unit, too, is good. However, few maximum intake flows and maximum demand flows occur, to be few. Does it think that it is a luxurious request that there is a little more?
2) PCV can not understand the inevitability which switches over as it sets Š¸"ETE" from the I:E ratio in VCV though it is the method which sets intake time. i servo and Ebita XL however, it is an intake adjusts-the-hours. VCV however, to set at the intake time is easy to set about the side of the medical care, too. The possibility to simplify an operating panel, too, because it doesn't change a panel display as the design side, too, and it finishes