3100B Theory of Operation and Controls

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3100B Theory of Operation and Controls
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3100B Theory of Operation and Controls

• Approved for sale outside the
• US in 1998 for patients
• weighing gt 35 kg failing CMV
• Approved September 24, 2001
• by the FDA for sale in the US

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SensorMedics 3100B

• Electrically powered, electronically controlled
  piston-diaphragm oscillator
• Paw of 5 - 55 cmH2O
• Pressure Amplitude from 8 - 130 cmH2O
• Frequency of 3 - 15 Hz
• Inspiratory Time 30 - 50
• Flow rates from 0 - 60 LPM

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Paw is created by a continuous bias flow of
gas past the resistance (inflation) of the
balloon on the mean airway pressure control valve.
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Principle of the SM 3100A HFOV
Super-CPAP system to maintain lung volume
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To pressurize the patient circuit, the Reset
/ Power Fail button must be pressed and held
until the mean airway pressure is at least 5 cmH2O
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Oxygenation

• The Paw is used to inflate the lung and optimize
  the alveolar surface area for gas exchange.
• Paw Lung Volume

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Optimizing Hemodynamics

• PVR is increased with
• Atelectasis
• Loss of support for extra-alveolar vessels
• Over expansion
• Compression of alveolar capillary bed
• The lung must be recruited, but guard against
  over expanding.

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Primary control of CO2 is by the stroke volume
produced by the Power Setting.
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Alveolar ventilation during CMV is defined as F
x Vt Alveolar Ventilation during HFV is
defined as F x Vt 2 Therefore, changes in
volume delivery have a more significant affect on
CO2 elimination than frequency
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Pressure transmission
Gerstmann D.
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Pressure transmission HFOV
P
T
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• The Inspiratory Time also controls the time for
  movement of the piston, and therefore can assist
  with CO2 elimination.
• Increasing Inspiratory Time will also affect
  lung recruitment by increasing delivered Paw.

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Inspiratory / Expiratory Ratio

• I/E Ratio adjustable with Inspiratory time
  control
• Inspiratory time Forward movement piston
• Expiratory time Backward movement piston
• Backward movement piston active exhalation !
• Recommended Insp. time 33

30
--
70
Inspiratory time adjustable 30 - 50
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Secondary control of PaCO2 is the set Frequency.
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Regulation of stroke volume

• The stroke volume will increase if
• The amplitude increases (higher delta P)
• The frequency decreases (longer cycle time)

Stroke volume
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Piston Centering is automatically regulated by
the instrument and requires no operator
intervention.
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Alarms
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Preset High and Low mean airway pressure
alarms. Upon activation the oscillator will stop
and the circuit pressure will vent to ambient.
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Activation of the high mean pressure alarm will
trigger the Auto Limit System. The Auto Limit
System will open the blue limit valve on the
circuit and vent pressure. The valve will then
repressurize to its normal operational state.
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After resolution of the fault condition the
visual alarm can be cleared by pressing the Reset
/ Power Fail Button
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Activation of the low mean airway pressure alarm
will only provide audible and visual alarms. The
visual alarm will automatically reset after the
fault condition has resolved
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The source gas low alarm will provide only a
visual indicator if either of the high pressure
gas supplies falls below 30 psi.
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The battery low alarm will provide only a visual
indicator when the nine volt alarm battery needs
replacement.
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The oscillatory overheated alarm will provide
only a visual indicator if the linear motor
temperature exceeds 150 degrees Centigrade.
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The oscillator stopped alarm will provide audible
and visual indicators if the oscillatory
amplitude is at or below 7 cmH2O and the
oscillatory subsystem is energized, (as indicated
by the illumination of the green LED on the start
stop button)