Heart Lung Machine:

During the extracorporeal circulatory bypass, the venous blood is drained (by gravity) into a reservoir and pumped through a blood oxygenator and into the patient through a tube connected to the arterial circulation. Blood which seeps to the operating field can be returned to the patient using auxiliary pumps. The patient body temperature can be controlled by selectively cooling or heating the blood through a heat exchanger. In the 5 th generation, the InCor heart lung machine was built with technology developed in Brazil and consists of:

• 4 peristaltic pumps (controlled in RPM or LPM)
• Thermostat and water pump
• 2 timers
• Blood reservoir illumination
• Uninterruptible power supply
• Malfunctioning warning for: water pump, electrical resistance, water level, water over heating, sensors diagnostic

Specifications:

• Power supply: 220 V @ 60 Hz
• Power consumption: 3000 W
• Heater power: 2000W
• Dimensions: 650 x 900 x 480 mm (H x W x D)
• Weight: 130 kg

a) Battery Operation¹

• Latex tubes: 120 min
• Tygon tubes: 40 min

b) Hydraulic System

• Water reservoir capacity: 8.5 L
• Water pump flow: 25 L/min
• Dimensions: 240 mm x 340 mm x 310 mm

c) Peristaltic Pump

• Velocity (maximum): 200 rpm
• Blood volume per rotation (varies according to tube supplier):
  
  

  	1/2" Tube	1/8" Tube
  Latex tube	40 ml/rpm	22.5 ml/rpm
  Tygon tube	na	26.0 ml/rpm

d) Thermostat

• Temperature control: PID (proportional, integral and derivative)
• Temperature (maximum): 43ºC

e) Blood Reservoir Illumination

• Fluorescent Lamp: 9 W

f) Timers

• 0 - 999 min

¹Test condition: auxiliary pump at 30 RPM, arterial pump at 100 RPM, output pressure of 400 mmHg and illumination turned on.