Assist Control (A/C); Simv; Cpap; Manual - BIO-MED DEVICES Crossvent-2i+ Operation & Service Manual

III. S P E C I F I C A T I O N S ,
A S S I S T C O N T R O L ( A / C )
Provides controlled or assist/control ventilation depending upon the Flow Trigger setting. If the patient fails to
initiate an inspiration, the Crossvent-2i+ will continue to cycle at the respiratory rate set with the RATE control. This
key is CMV when in Constant Flow mode.
S I M V
(Synchronized Intermittent Mandatory Ventilation) mode - Provides
spontaneous and intermittent assisted breaths. The patient is free to
initiate spontaneous breaths at a flow rate set with the FLOW control
and for the length of time of a normal inspiration as set with the
TIDAL VOLUME and FLOW controls or INSP key. During these
spontaneous breaths, a bolus of gas flows to the patient at PEEP or
atmospheric pressure. The patient inspires the amount desired and the
rest is dumped to atmosphere. At intervals set with the SIMV RATE
control, a triggered breath is provided under pressure (synchronized
mandatory breath).
C P A P
(Continuous Positive Airway Pressure)/Manual mode - Provides spontaneous breaths at PEEP or atmospheric
pressure (see spontaneous breaths under SIMV above). The manual key is operative in this mode. When in CPAP
mode, the rate key provides the backup rate and is displayed as BACKUP RATE.
M A N U A L
This is operative only in the CPAP mode. Provides one normal controlled breath each time it is pressed, with
inspiratory time and tidal volume as established by the Tidal Volume and Flow controls or INSP key. Minimum
expiratory time of 0.2 sec is provided.
C O N S T A N T F L O W
This function provides a continuous flow of gas out the patient connector as set by the L/min (Flow) Knob for continuous
flow, pressure limited ventilation. Pressing this key also will turn off Flow Trigger as patient triggering cannot be used when
Constant Flow is on. With Constant Flow on, the TIDAL VOLUME key becomes the INSPIRATORY TIME key,
allowing inspiratory time to be set directly. The Assist Control key changes to CMV and the SIMV key is eliminated. If the
unit is in SIMV mode when Constant Flow is pressed, it will shift to CMV mode and the SIMV RATE key changes to
RATE. The Rate key will provide machine breaths at the set rate and the patient can breathe spontaneously off the gas
provided by constant flow between machine breaths.
With CONSTANT FLOW on, the following additional limit is established: Maximum inspiratory time- 3.0 seconds. If the
Flow and Inspiratory settings are such that a tidal volume of 500 ml or greater will be delivered, then TV displayed below
the INSP key will flash and the alarm will sound. To correct this, either the Flow or Inspiratory time must be reduced.
In Constant Flow/CMV mode, if a situation arises that causes the Peak Pressure High Alarm limit to be exceeded, PIP and
Flow will be terminated and the unit will alarm. They will be restored when the pressure decreases to what the PEEP
reading was prior to the occurrence.
WARNINGS: IN THIS MODE: FLOW TRIGGER AND PRESSURE SUPPORT
ARE INOPERATIVE. ADDITIONALLY, PEAK PRESSURE AND PEEP READ
CONTINUOUS PRESSURE DURING CPAP. REFER TO THE APPENDIXES
FOR ALL FUNCTIONS DISABLED BY CONSTANT FLOW.
NOTE: In CONSTANT FLOW mode with CPAP, Backup is inoperative.
F L O W T R I G G E R
The pneumotach must be installed to use this function. Sets the level of sensitivity to detect a patient's effort to breathe by
sensing flow through the pneumotach. The sensitivity can be adjusted within a scale of 1 - 20, where 1 is the most sensitive
and 20 is the least sensitive. When FLOW TRIGGER is on, a base flow of 2-3 LPM is activated during expiratory.
FLOW TRIGGER is off if CONSTANT FLOW is on. To turn on FLOW TRIGGER, press it. FLOW TRIGGER will
highlight and be set to the last used setting. CONSTANT FLOW will be turned off. To adjust the sensitivity, use the
arrow keys to scroll to the desired sensitivity.
WARNING: Without the pneumotach in the circuit and connected to the ventilator,
there will be no patient triggered breaths.
WARNING: Auto-triggering or missed breaths may occur due to various conditions
including, but not limited to, compliance, resistance, rate, flow, PEEP, I:E ratio, and
circuit characteristics.
C O N N E C T I O N S A N D
17
U S E R I N T E R F A C E - C O N T .
A/C