14 Safety Information
Vivo 40 clinician’s manual
Doc. 003886 En-Us A-1e
2.5 Invasive Use
• For invasive applications, assure that an intentional leakage port is present
in the patient circuit. Install the leakage port as close as possible to the
patient connection, to reduce the risk of rebreathing CO
2
.
• When using the Vivo 40 invasively the low volume alarm and the low
breath rate alarm must be carefully set, to ensure safe use.
• The highest output from the HA 01 humidifier is 30 mgH
2
O/litre, which
means that it does not fulfill the humidifier standard for invasive use.
• The Vivo 40 is equipped with a low leakage alarm. The low leakage alarm is
not a substitute for operator vigilance in ensuring that the leakage ports
remains clear at all times. Periodically check the leakage ports during ther-
apy.
• In general as pressure decreases the potential of rebreathing increases.
Lower pressures produce less flow through the leakage ports which may
not clear all CO
2
from the circuit to prevent rebreathing.
• In general as inspiratory time increases the potential of CO
2
rebreathing
increases. A higher inspiratory time decreases the expiratory time allowing
less CO
2
to be cleared from the circuit before the next breath. I:E (inspira-
tion time : expiration time) ratios close to 1:1 increase the potential of CO
2
rebreathing.
• Tracheal tubes, oral/nasal tubes etc with small inner diameters increase the
resistance in the breathing circuit.
• An external heated humidifier approved for invasive use or an appropriate
HME (Heat and Moisture Exchanger, artificial nose)/HCH (Hygroscopic
Condenser Humidifier) is recommended.
