Healthcare Professionals

Affinity NT <br>Oxygenation system

With Balance™ Biosurface



6+ MILLION Produced on single manufacturing line

The Affinity NT™ oxygenation system set the standard for the industry as the first to feature a radial blood flow design and graduated fiber winding.

Consistent performance
Reliable results

The Affinity NT oxygenator continues the Affinity tradition of high performance and convenience.

  • Proprietary graduated fiber bundle density technology and radial flow design for enhanced gas transfer and low pressure drop
  • Excellent air handling capabilities with separate venous and cardiotomy inlets, a final screen intended to remove air and other potential emboli, and a design that prevents blood contact with defoamer (unless foam is present)
  • Clear design for unobstructed visibility pre- and post-membrane for ease in priming

Balance biosurface*

Balance's heparin-free, hydrophilic polymer surface reduces platelet adhesion and more.

A balanced approach to preserving platelet function.

Balance’s heparin-free, hydrophilic polymer surface reduces platelet adhesion and activation.1 Platelet activation has been shown to play a role in systemic inflammatory response.2-5

% functional platelets over time

This graph shows how Balance’s heparin-free, hydrophilic polymer surface reduces platelet adhesion and activation over time.

Oxygenator performance data

Graph showing the oxygenator's O2 transfer rate, CO2 transfer rate as the blood flow rate changes
Graph showing CO2 transfer (mL/min) as compared to blood flow rate (L/min) among different oxygenators
Chart showing the oxygenator's blood side pressure drop rate as blood flow rate changes
Chart depicting the Affinity oxygenation system's heat exchange efficiency as a function of blood flow rate (L/min)

Manuals and technical guides

Find the Affinity NT™ oxygenation system technical manual in the product labeling supplied with each device.

Model specifications

Affinity NT oxygenator on white background

Affinity NT Oxygenator

Membrane type: Microporous polypropylene hollow fibers
Membrane surface area: 2.5m2
Static priming volume: 280 ml
Recommended blood flow rate: 1-7 L/min
Maximum water side pressure: 30 psi
Arterial outlet port: 3/8”
Venous inlet port: 3/8”
Arterial sample port: Female luer port
Access port: Female luer port
Recirculation port: 1/4"
Gas outlet port: 3/8” nonbarbed
Water ports: 1/2” quick disconnects

Affinity NT CVR on white background

Affinity NT CVR Specifications

Reservoir volume capacity: 4,000 ml
Recommended blood flow rate: 1-7 L/min
Maximum cardiotomy blood flow rate: 6 L/min
Minimum operating level: 200ml
Cardiotomy filtration: 30 μm
Venous inlet screen: 200 μm
Final reservoir screen: 150 μm
Positive pressure relief valve crack: < 5 mm Hg
Vacuum pressure relief valve crack: > 150 mm Hg

Ordering information


541B Affinity NT integrated uncoated CVR/oxygenator with Balance Biosurface 2
511B Affinity NT oxygenator with Balance Biosurface Available in custom tubing packs

Accessories and Holders

61399401093 Affinity oxygenator with integrated CVR holder 1
61399401072 Affinity oxygenator holder 1
TP Temperature probe 1

Cortiva™ BioActive Surface, formerly marketed under the Carmeda® brand name. Carmeda is a registered trademark of Carmeda AB (Sweden). 
Technology licensed under agreement from BioInteractions, Limited, United Kingdom

Representative of the Affinity NT with Balance Biosurface. Bench data on file. Not necessarily predictive of clinical performance results..



Medtronic data on file.


Morrell CN, Aggrey AA, Chapman LM, Modjeski KL. Emerging roles for platelets as immune and inflammatory cells. Blood. May 1, 2014;123(18):2759-2767.


Sonmez O, Sonmez M. Role of platelets in immune system and inflammation. Porto Biomedical Journal. November-December 2017;2(6):311-314.


Mirza I, Kottke-Marchant K. In: Kottke- Marchant K, ed. An Algorithmic Approach to Hemostasis Testing. 2nd ed. College of American Pathologists; 2016:30-31.


Thomas MR, Storey RF. The role of platelets in inflammation. Thromb Haemost. August 31, 2015;114(3):449-458.