Oil-less compressors for medical devices


Compressors for Stationary Oxygen Concentrators (SOC)

A stationary oxygen concentrator uses compressed air flow, generated by oil-less air compressors, to deliver medical grade oxygen (93-95% O2 concentration) for long-term home oxygen therapy. Oil-less compressors are combined with a molecular sieve (Zeolite) to generate oxygen, either through pressure swing adsorption (PSA O2) or vacuum pressure swing adsorption (VPSA O2). Vacuum swing adsorption (VSA O2) is typically used in larger gas plant applications, but could also be considered for certain SOC size and output ranges.

As the leading OEM compressor supplier for SOC systems, Gardner Denver Thomas supplies WOB-L® piston compressors for concentrators of all sizes. Our engineers work directly with the customer’s design team to achieve fast, optimal solutions.

Advantages of Gardner Denver Thomas compressors for SOC applications:

  • Oil-less operation eliminates the need to filter the compressed air stream to the sieve beds, which simplifies system design and protects downstream high-value components.
  • Wear parts (e.g. piston cup seals, valves and bearings) are selected for durability and reliable, long-life operation, thus ensuring the lowest total cost of ownership for our customers.
  • Balanced eccentrics, valve design and bearing specifications minimize design trade-offs such as sound and vibration, as well as their effect on material costs.


Contact us for your individual application request. 


Compressors for Portable Oxygen Concentrators (POC)

Portable oxygen concentrators are lighter and more compact than stationary versions, allowing patients to move freely at home and while travelling.

For this application, we offer Thomas WOB-L® piston compressors and THOMALAST diaphragm technology, which generate medical grade oxygen for long term home oxygen therapy. Currently used in both vacuum pressure swing adsorption (VPSA O2) and pressure swing adsorption (PSA O2) systems, the technology could also be applied to vacuum swing adsorption (VSA O2) oxygen concentrators.

Advantages of Gardner Denver Thomas WOB-L® piston compressors and THOMALAST diaphragm technology for POC applications:

  • Variable output
  • Low power consumption
  • Small compressor size
  • Compact, lightweight design
  • Durable operation with long–life reliability

In particular, the Thomas BLDC motor offers our OEM compressor customers the ability to optimize design throughout the development cycle.

  • Low power consumption across a wide range of speeds extends battery life, allowing patients greater mobility between charges.
  • Variable output allows patients to select their specific oxygen requirements, thus using only what is needed.
  • Low heat generated per unit of work minimizes stress on the thermal management system, which balances battery life with compressor weight.


Contact us for your individual application request.