3100A Ventilator

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3100A Ventilator
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3100A Ventilator

• Approved in 1991 for Neonatal Application for the
  treatment of all forms of respiratory failure.
• Approved in 1995 for Pediatric Application, with
  no upper weight limit. For treating selected
  patients failing conventional ventilation.

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Theory of Operation

• Oxygenation is primarily controlled by the
  Mean Airway
  Pressure (Paw) and the FiO2
• Ventilation is primarily determined by the
  
  stroke volume (Delta-P) and the frequency
  of
  the ventilator.

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SensorMedics 3100A

• Electrically powered, electronically controlled
  piston-diaphragm oscillator
• Paw of 3 - 45 cmH2O
• Pressure Amplitude from 8 - 110 cmH2O
• Frequency of 3 - 15 Hz
• Inspiratory Time
• 30 - 50
• Flow rates from
• 0 - 40 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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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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Ventilation
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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 (as a function of
Delta-P, Freq., or Insp. Time) have the most
significant affect on CO2 elimination
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Pressure transmission
Gerstmann D.
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Pressure transmission HFOV
P
T
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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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• The Inspiratory Time controls the time for
  piston displacement, controlling 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
• (prevents air-trapping)

30
--
70
Inspiratory time adjustable 30 - 50
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Patient Circuit Calibration
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Ventilator Performance Check