Figure legends
Figure 1 Experimental apparatus of the connection test lung
model
The designed spontaneous breathing lung model essentially contains two
TTL, an airway management trainer and a ventilator. The driving bellows
(A) with a lifting bar (coupling clip) in the site is connected to a
LTV1200. The ventilation bellow (B) is connected to the tracheal of an
airway management trainer through a set of a Y piece (Y1) adaptor and V1
and V2, which bring together through Y2). The expiratory gas
modification bellow(C) is connected to the bellow B through a rigid
metal strip and is connected to Y1 through V3 and V4. The open end of
the main bronchus, which the carina position was to join together
through the Y piece (Y3), and oxygen analyzer is connected between the
Y1 and Y3. When the driving ventilator enlarges the bellow A of the TTL,
which results in negative pressure within the bellow B and bellow C, and
inspiration flow into the bellow B and C through the V1 and V4,
respectively, and airway trainer, just like spontaneous breathing.
During the expiration phase, the bellows B and bellow C passively
deflates the gas outside through V2 and V3, respectively. The gas from
bellow C through V3 was used to wash out the previous gas in the
anatomic dead space in the airway trainer. An oxygen analyzer is
position near the carina to monitor the FO2 insp. and
FO2 pre-insp. of gas during the inspiratory and
expiratory phases, respectively. The airway trainer is equipped with
nasal cannula.
Figure 2 Simulated spontaneous breathing lung model and nasal
cannula setting. VT: tidal volume, f: respiratory rate,
TI: inspiratory time.
Figure 3 The friction of oxygen waveform during respiratory
cycle. FO2 insp.: peak inspired oxygen concentration,
FO2 pre-insp.: end-expired oxygen concentration.
Figure 4 Effect of VT on muscle pressure
Figure 5 Effect of VT on FO2insp. during the same f
Figure 6 Effect of tidal volume on FO2pre-insp. during the same f