High Performence -Cost Anesthesia Machine Cwm-301c

• Drive: Gas Driven
• Gas Source: Oxygen, N2o
• Transport Package: Standard Export Packing
• Specification: ISO, CE
• Trademark: CW
• Origin: China
• Model NO.: CWM-301C
• HS Code: 90189070
• Production Capacity: 5000PCS/Year

Product Description

Physical specifications
Demension:70x85x140cm,weight:65kg,screen:10.1 LCD
display graphics:wave forms P-T,F-T,V-T ,
loops:P-V,V-F,F-P

working specifications
power:AC110V-240V,50HZ/60HZ, battery power:≥180 mins
Calibration:auto
Pipeline supply gas:O2,N2O

ventilator specifications
patient range:adult,peadiatric
ventilation mode:VCV,A/C,SIMV,MANUAL,STAND-BY,PCV

ventilator parameter
working type:electronic control ,pThe main structure and working principles
Main unit
Structure

1. Anesthesia ventilator
2. Flow meter
3. Vaporizer(Enflurane, isoflurane and sevoflurane)
4. Anesthesia ventilation system
5. Frame
6. O₂ faulty alarm and protection

See Fig 1 the structure of anesthesia system





























Fig 1 the structure of anesthesia system
Working principles

1. Gas source (O2, N2O) enter into the system, it is regulated by the flow control valve of the flow meter to the desired flow or proportion and then, through the anaesthesia vaporizer, is sent to the breathing system through the fresh gas (mixed gas) outlet; this gas is called fresh gas (mixed gas). Anaesthesia gas concentration is controlled by the vaporizer. When the evaporation concentration regulating knob is turn to "0" position, there is no anaesthesia gas in the outputted fresh gas.
2. Another loop of O2 that has entered the machine reaches the oxygen flush button directly. The oxygen outputted from the oxygen flush enters the breathing loop system through fresh gas outlet.
3. There are still two loops of O2 that has entered the machine, which go to oxygen fault alarm device and N2O cut-off protection device respectively. When O2 pressure is lower than 0.2 MPa, the machine gives audible alarm, and cuts off N2O supply at the same time.
4. The fresh gas sending to the breathing loop system is stored in the leather bag of the ventilator (when ventilator is used, and "AC" is selected). Then, the patient's breathing is controlled by the ventilator; or manually control the breathing leather gas storage bag (when ventilator is not used, and "MC" is selected). Then, the patient's breathing is controlled manually by pinching the breathing gas storage bag.
5. When inhaling, gas outputted from the ventilator's leather bag (or manually controlled breathing gas storage bag) and fresh gas are sent to the lungs of the patient through CO2 absorber, breathing flap, inhaling gas connector, threaded tube and "Y" connector.
6. When exhaling, the gas exhaled by the patient returns to the ventilator's leather bag (or manually controlled breathing gas storage bag) through "Y" connector, threaded tube, exhaling gas connector, and breathing flap, completing a circulation process. The excessive gas is discharged out by the safety valve of the ventilator (or APL valve).

Anesthesia ventilator
Function
The anesthesia ventilator provides patient with aux. or controlled ventilation during operation and resuscitation after operation, and monitors, controls and displays patient ventilation parameters.
 

Structure

The ventilator mainly consists of:

1. Front panel operation keys;
2. Sampling sensor;
3. Respiration monitor;
4. Computer control system;
5. Adjustment and control mechanism;
6. Driving mechanism;
7. Display;
8. Fault alarm and safety protection device etc.

Refer to Fig.2 for ventilator front panel.







1 Display screen  2 Operation key zone       3 Tidal volume adjustment knob
Fig.2 Ventilator front panel

Working principle

Refer to Fig.3 for ventilator working principle block diagram, in which hollow arrows are used for gas circuits, and single line arrows are used for electric circuits.










Fig.3 Ventilator working principle block diagram

1. After gas source (O₂) enters anesthesia system, it will reach respiration control valve inlet.
2. During inhalation, respiration control valve opens and expiratory valve closes. Oxygen pushes peltry in breathing Bellows via flow regulating valve, so that patient obtains required tidal volume. The flow regulating valve adjusts gas flow (tidal volume) supplied to patient.
3. During exhalation, respiration control valve closes and expiratory valve opens. Gas exhaled by patient pushes peltry in breathing Bellows in reverse direction, so that gas (oxygen) in Bellows passes expiratory valve and gas exhaust, and is then vent to atmosphere.
4. According to ventilation parameters set by panel operations, Micro PC control board processes airway pressure and tidal volume acquired by pressure sensor and flow sensor, and then controls respiratory frequency, inspiratory time, expiratory time, and tidal volume etc. At the same time, monitored respiration parameters will be displayed on front panel.
5. According to alarm parameters set by panel operations, in case monitored respiration parameters exceed alarm parameter settings, micro PC control board will prompt and send audible alarm.
6. When airway pressure reaches set pressure of safety valve (not exceeding 6kPa), the safety valve will automatically open to prevent excessive gas passage pressure resulting in compressive injury to patient air passage.

Flow meter

Functions

The flow meter is equipped with flow control valve, which controls and indicates the flow of common gas (fresh gas) supplied to patient. O₂, N₂O proportion control device can ensure concentration of the output O₂ is≥25 %.
 

Structure

1. The flow meter is a type of O₂, N₂O four-tube rotor flowmeter. O₂ and N₂O flow meters are composed of thick tubes and thin tubes respectively. The fine tubes are of low flow range; and the thick tubes are of high flow range.
2. The flow meter is equipped with flow control valve. Flow and proportion of O₂, N₂O in the output fresh gas is controlled respectively by corresponding flow control valve. Anticlockwise rotation of the flow control valve is increasing the flow, while clockwise rotation is decreasing the flow.
3. The flow control valve of O₂ and N₂O is equipped with O₂, N₂O proportion control device, so as to ensure concentration of the output O₂ is≥25 %. When O₂ is closed, N₂O is closed automatically at the same time.

 

O₂ flush button

O₂ flush button provide high-flow oxygen to the anesthesia system by the ACGO gas inlet:

1. Press the button to input high-flow oxygen;
2. Release the button to stop the gas flow.

neumatic driven
tidal volume:20-1500ml ,pressure range:5-60 cmH2O
RRR:1-100bpm,, I:E range:4:1-1:8
Ptrigger range:-20-0 cmH2O,,
minute volume range:>18L/min

System 
Hypoxic guard system:N2O cut off valve,
O2 concentration>25%, safety valve:<12.5kPa
O2 flush:25-75L/min
flow meter:4 tubes cascade 0-15L/min O2,0-15L/min N2O,
volume of CO2 absorber:2L , vaporizer: 1/2 piece 

Monitoring:VT,MV,BPM,Paw,LUNG compliance,inspiratory platform, FiO2

PEEP
type:intergrated electronic control ,
range:off/ 3-30cmH2O