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CDI® 550

Blood Parameter Monitoring System


Real-time monitoring of DO2 as one of 12 key blood parameters

The proven technology of the CDI® Blood Parameter Monitoring System 550 delivers continuous blood parameter readings, providing early detection of changes in patient status during cardiopulmonary bypass surgery.

CDI® System 550

Based on optical fluorescence and reflectance technologies, the CDI® System 550 continuously measures or calculates 12 critical blood parameter values during cardiopulmonary bypass. Access to continuous information is a key advantage in optimum patient management because it enables clinicians to react without delay to changes in blood parameter values.

Easy Set Up and Calibration

There is no warm-up time required for installation or calibration. Installing the sensor in the shunt line requires a few, simple luer connections. The shunt sensor also can be added after the initiation of bypass, facilitating set up in emergency cases.

System Features
  • Self-diagnostic system verifies proper functioning of electronics and optics.
  • System alerts provide visual and audible indicators when parameters fall outside user-specified limits.

Clinical evidence

Goal-directed perfusion to reduce acute kidney injury: A randomized trial
Ranucci M, et al. Goal-directed perfusion to reduce acute kidney injury: A randomized trial. J Thorac Cardiovasc Surg. 2018;156(5):1918-1927.e2

Goal-directed perfusion to reduce acute kidney injury: A randomized trial
Ranucci M, et al. Goal-directed perfusion to reduce acute kidney injury: A randomized trial. J Thorac Cardiovasc Surg. 2018;156(5):1918-1927.e2

General specifications

​Displayed parameters
​System Operating Ranges
​System Display 
​6.80 to 7.80 pH units
​6.50 to 8.50 pH units
​pCO2​10 to 80 mmHg
(1.3 to 10.7 kPa)
​10 to 200mmHg 
(1.3 to 26.7 kPa)
​pO2​20 to 500 mmHg
(2.7 to 66.7 kPa)
​10 to 700 mmHg
(1.3 to 93.3 kPa)
3.0 to 8.0 mmol/L​​1.0 to 9.9 mmol/L
​Temperature​15.0° to 45.0° C
​1.0° to 45.0° C
​Oxygen saturations (SO2)​60 to 100%
​35 to 100%
​Hematocrit (Hct)​15 to 45%
​12 to 45%
​Total hemoglobin (Hgb)​5.0 to 15.0 g/dl
​4.0 to 15.0 g/dl
​Oxygen consumption (VO2)​​10 to 400 ml/min
​10 to 400 ml/min
​Oxygen Consumption

​1 to 999 ml/min/m²
​Oxygen Delivery (DO2)
​10 to 2000 ml/min
​10 to 2000 ml/min
​Oxygen Delivery (Indexed)
​1 to 2000 ml/min/m²
​Base Excess (BE)
​-25 to 25 mEq/L
​-25 to 25 mEq/L
​ Bicarbonate (HCO3)​0 to 50 mEq/L
​0 to 50 mEq/L
​Blood Flow (Q)

​0.0 to 9.9 L/min
​Product Specification
​Size (H x W x D)
​Monitor with BPM and H/S probe
28 cm x 38 cm x 17 cm
​32 cm x 21 cm x 26 cm
​Monitor power requirements and specifications
​100 - 240 VAC, 50/60 Hz
​12 V backup battery
​Data output port RS-232 serial interface
​Pumping systems input port: RS-232/ RS-485 serial interface
​System measurement cycle time​pH, PCO2, PO2 = one measurement per second
​K+= one measurement per six seconds
SO2, Hct Hgb = one measurement per eighteen milliseconds​
​System display update​Every six seconds

Item specifications

​The CDI® System 550 is comprised of the following components

DescriptionCatalog #​​Units/Case
​Monitor with one blood parameter module and one H/S probe​550AHCT​1


Description​Catalog #​Units/Case
​Monitor with two blood parameter modules and one H/S probe​550AVHCT​1
​Monitor Pole Clamp, 7,0" (17,8 cm) arm length, calibrator mount*
​Cable head bracket*

Accessories for use with the CDI®System 550*

Description​​Catalog #Units/Case
​ ​Calibrator.PNG
​Gas A, calibration gas for use with Calibrator model 540​​CDI506​1
​Gas B, calibration gas for use with Calibrator model 540​CDI507​1
​Printer paper​​7310​5

Single-use devices for use with CDI® System 550*

Description​​Catalog #Units/Case
​ ​ ​ ​ ​ ​CDI H_S Cuvette.png​CDI H/S Cuvette 1/4" x 1/4" mm (6,4)
​CDI H/S Curvette 3/8" x 3/8" mm (9,5)
​CDI H/S Cuvette 1/2" x 1/2"mm (12,7)
​CDI H/S Cuvette 1/4" x 1/4" mm with 6" (15,2 cm) extension tube​6934​10
​CDI H/S Cuvette 3/8" x 3/8" mm with 6" (15,2 cm) extension tube​6933​10
​CDI H/S Cuvette 1/2" x 1/2" with mm 6" (15,2 cm) extension tube
​ ​ ​CDI500 ShuntSensor.png
​CDI Shunt sensor, Heparin-treated
* These devices are also compatible with the CDI® System 500.

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