Naesthesia Machine (CWM-101A)
Main features:
Applied for closed, semi-open inhalation anesthesia, controlled or assisted ventilation, monitoring and displaying patients' ventilation parameters
Applied for adult and child
APL valve is available
Good air tightness, easy to be operated, cleaned and disinfected
With concentration precisely controlled temperature, flow and pressure compensation technology
Optional imported vaporizers of isoflurane, enflurane and sevoflurane are provided as required
With gas driven and electrical control, color LCD screen displaying sorts of monitoring parameters
Main specifications:
Power: 220V AC ± 10%, 50Hz ± 2%, built-in battery for backup
Gas: O²
Flow meter: 0.1 to 10L/minute (adjustable)
Vaporizer: Single (optional: Double)
Range of concentration: 0 to 5%
Ventilation modes: IPPV, manual
Parameters monitoring: Tidal volume, frequency, airway pressure
Alarm: AC power failure, minute volume too high (low), airway pressure too high (low) and insufficiency of O² .
| Power: |
220V AC ± 10%, 50Hz ± 2%, built-in battery for backup |
| Gas: |
O² |
| Vaporizer: |
Single (optional: Double) |
1. Introduction
CWM-101A portable anesthesia machine is designed according to ISO
Standard. The machine meets the basic requirements for semi-closed or closed
inhalational anesthesia used in adults or children.
2. Technial Specifications
2.1 Working Conditions
2.1.1 Environmental temperature :5~400C;
2.1.2 Relative humidity : not greater than 80%;
2.1.3 Atmosphare pressure:86~106kPa;
2.1.4 Working gas Pressure:0.4+0.1MPa;
2.2 Oxygen flow meter :0.1~10L/min
N2O flow meter: 0.1~10L/min
2.3 Oxygen flusher: 35~75L/min
2.4 Vaporizer: 0~5Vol%(O2flow=1L/min)
2.5 Low Oxygen Supply Alarm
It sounds at least for seven seconds.
When oxygen supply pressure is lower than 0.2MPa.
3. Structure and Working Principle
3.1 Structure
The machine consists of flowmeter, Vaporizer, breathing circuit, and
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aspiratory/expiratory valves and machine frame.
Fig .1 CWM-101A Portable Anesthesia machine (Front View)
Fig.1
1.handle 2. Pressure gauge(N2O) 3. Pressure guage (O2) 4. Oxygen Flush button
5. flow meter 6. vaporizer 7. Up-dowm bar
8. Knog for locking the up dowm bar 9. Fresh gas common inlet 10. Breathing bag terminal
11. Exhaust gas port 12. Inspiratory hose 13. Scavenger port
14. Pedestal 15. Inspiratory valve 16. Pressure guage in breathing circuit
17. CO2 A bsorber can ister 18. Expiratory hose 19. Expiratory valve
3.2 Working Principle
The anesthesia gas in the breathing circuit comes from the compressed gas
source of oxygen after it is decompressed by the oxygen regulator. A given
concentration of enflurane is provided and controlled by the specific vaporizer.
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Inspiratory and expiratory anesthetic gas flow in the breathing circuit is directed by
two one direction breathing valves. During inspiration, the inspiratory valve is
open, while the expiratory valve is on close position. During expiration, the
inspiratory valve is closed, while the expiratory valve is open. The respiration gas
flowes always in one direction, which ensures that CO2 expired from the patient is
absorbed completely after passing through the CO2 absorber canister within the
circuit. The excess gas is expelled out through the exhaust gas port .
1. Installing and Debugging
a) Gas Source
Oxygen supply comes from either the central pipeline system or oxygen
cylinder. The gas supply pressure of oxygen must be regulated to a range of
0.3~0.5 MPa before it goes to the machine.
N2O supply comes from either the central pipeline system or N2O cylinder. The gas
supply pressure of oxygen must be regulated to a range of 0.3~0.5 MPa before it
goes to the machine.
4.2 Breathing Circuit
As shown in Fig.1, breathing circuit consists of a breathing bag, CO2
absorber canister (17), aspiratory valve (15), expiratory valve (19).two corrugated
tubes and Y-piece. The oxygen and anesthetic gas are delivered by a tube
connected between the fresh gas common outlet(inside the machine) and the fresh
gas common inlet (9). during mechanical ventilation.
4.3 Pouring Inhalation Drug
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After turning out anticlockwise the screw on the inlet of the enflurane
Vaporizer, enflurane is added into the Vaporizer. The liquid level of enflurane
should be kept between the lowest and highest guard lines. The inlet of Vaporizer
is then closed by turning clockwise the screw in after that.
4.4 The Vaporizer should be serviced and checked after 2500 hours use .
2. Operating Instructions
a) Preparations
i. Connect correctly all parts of the machine according to Fig.1;
ii. Test the oxygen flush function and make sure that it works in good
condition;
iii. Airtight Test.
Breathing circuit is closed completely, an airtight test is carried out by
flushing oxygen until the pressure inside the system as high as 3kPa (shown by the
breathing system pressure gauge) reached and keeping it for one minute .The
circuit system is airtight well if the pressure inside dropped by less than 0.4kPa
within one minute.
iv. Functional Test of the Valves
Under 1 kPa pressure inside the circuit, squeeze and release the breathing
bag alternatively to see whether it works in normal condition.
v. Turn on the oxygen flow meters to see whether they move
normally .During ventilation, oxygen flow must be kept greater than 0.5L/min .
b) Manual Ventilation
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i. Squeeze the breathing bag properly to deliver anesthesia gas to the
patient with the aspiratory valve opened and the expiratory valve closed.
Expiration is performed during releasing the breathing bag quickly after squeezed;
ii. Scavenge excess gas by turning.
3. Precausions
a) High pressure oxygen must be reduced in a range of 0.3~0.5KPa before
delivered to the machine;
b) Enflurane must be added into the Vaporizer specifically for enflurane .Do
not disassemble the Vaporizer in private;
c) Gas flow sensor and CO2 absorber canister should be used with care .
4. Maintenance and Service
a) After use, the face mask, Y-piece , corrugated tubes and breathing bag
should be cleaned with running water and sterilized with formalin steam for 2
hours;
b) The aspiratory and expiratory valves ,and gas flow sensor should be
cleaned and dried after use;
c) After 2500 hours use ,the machine should be chocked and serviced
generally and the O-ring seals should be replaced with new one;
d) Contact with our company in case that any trouble with your machine
occurs .It will be free to service up to one year from the date sending up so long as
the trouble belongs to the quality itself.
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5. Transportation and Storage
A well packed machine can be transported by any kind of transportation.
During transportation and storage, the machine should be kept away from rain,
humidity greater than 80%, caustic substance, strong shake and stock. Never put
the machine upside-down at any time.
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