3) Description
The general architecture of the device is based on the use of a blower (pressurised air genera-
tor) and two micro-controllers (one for the general functions of the unit and another one for
the motor control).
Some functions are hardware-controlled, some are software-controlled and others are a mix-
ture of hardware and software.
The GoodKnight 425 BiLevel is a BiLevel positive airway pressure device used in the treat-
ment of obstructive sleep apnea or for the titration in the sleep lab of a patient having obstruc-
tive sleep apnea. It is intended to treat OSAS patients who are over 30 kg in weight (66
pounds).
In the BiLevel mode the GoodKnight 425 tracks patient breathing cycles and, in response to
the patient’s inspiratory and expiratory efforts, provides two levels of pressure :
-IPAP : a higher level of pressure for inspiration (a range from EPAP to 25 cmH2O)
-EPAP : a lower pressure for expiration (a range from 3 to IPAP or 20 cmH2O).
-If IPAP is equal EPAP, than the unit operates in CPAP mode.
The GoodKnight 425 BiLevel is a microprocessor-controlled pressure generator capable of
controlling the pressure delivered to the patient. Among its operating features are:
*
GK425
ST
in CPAP, BiLevel with and without backup frequency
*
GK425
in CPAP, BiLevel without backup frequency.
* Monitors pressure, respiratory rate, I/E ratio and compliance.
* Adjusts inspiration and exhalation flow-triggered sensitivity independently to provide
precise patient comfort.
* Provides a maximum pressure setting of 25 cmH2O
* Compensates automatically for altitude and for leaks up to a total flow rate of 120 liters
per minute, on top of the usual 4mm non re-breathing leak at 20 cmH2O.
The GoodKnight 420 Series benefits from a new blower technology that is specifically
designed for this range of Cpap systems. This design provides optimum performances in
terms of size, consumption, noise and stability.
In order to guarantee these optimum performances, some parameters are electronically
tuned during the manufacturing process. These parameters are calculated for each
blower and cannot be duplicated for another one. For this reason it is not possible to
change a blower or an electronic board. In the event of failure, an internal chassis as-
sembly fitted with a factory-set blower and electronic board is available.
P/N: M-145MAT00-20
Rev. A -
Page Rev.A
II-3
4) Inspiratory and Expiratory sensitivity
The trigger of sensitivity can be set with a scale of 1 to 10.
1= The lower triggering level = The highest sensitivity,
10=The highest triggering level = The lower sensitivity.
GoodKnight 425 / 425ST S
ervice Manual
Содержание GoodKnight 425
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Страница 9: ...I GENERAL INFORMATION GoodKnight 425 425ST Service Manual P N M 145MAT00 20 Rev A Page Rev A I 1...
Страница 15: ...II THEORY OF OPERATION P N M 145MAT00 20 Rev A Page Rev A II 1 GoodKnight 425 425ST Service Manual...
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Страница 39: ...P N M 145MAT00 20 Rev A Page Rev A III 17 Personal Notes GoodKnight 425 425 ST Service Manual...
Страница 50: ...P N M 145MAT00 20 Rev A Page Rev A III 28 Personal Notes GoodKnight 425 425 ST Service Manual...
Страница 51: ...IV SPARE PARTS GoodKnight 425 425ST Service Manual P N M 145MAT00 20 Rev A Page Rev A IV 1...
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