OEM Pumps for Negative Pressure Wound Therapy (NPWT)

Negative Pressure Wound Therapy (NPWT) is a medical technique to promote wound healing, thereby reducing treatment times and the risk of infection.

Main components of NPWT devices are the NPWT dressing itself and a vacuum pump to control wound management and wound care settings. The wound dressing, which is connected to the vacuum pump, is applied to an affected area.

NPWT Diagram

The therapy involves a vacuum which is applied and maintained through a specially sealed dressing over the wound. Hereby, the vacuum may be applied continuously or intermittently. This depends on the type of wound being treated and the healing objective.

Healing is promoted by increasing the blood supply in the vicinity of the wound. It assists with the removal of exudate as well. NPWT is applied to acute, post-operative and chronic wounds, which vary in size and geometry. Examples are diabetic ulcers and pressure ulcers or second- and third-degree burns.

A range of pressure wound therapy devices are available with different capacities and dressings to tailor the type of wound and therapy.

Several product lines within the Gardner Denver standard portfolio are well suited for the Negative Pressure Wound Therapy application. Further, the pumps do not only meet general market needs but, more importantly, can be modified to meet specific customer requirements.

Responsible for this is the modular system set up of each product family. Pneumatic performance can be tweaked by utilizing different eccentrics and/or by controlling the applied motor speed. Controlling the pumps individual working point allows for control of the respective vacuum level applied to the wound itself.

Different elastomers and plastics for all wetted components increase the chemical compatibility of the pump. Typical materials for the elastomers are EPDM or Viton (FKM). Pump head materials can be as diverse as IXEF or Ryton.

Key for the pump’s efficiency and overall lifetime is the motor. Almost all of Gardner Denver Thomas’ product lines offer low cost DC, standard DC or high end BLDC motors.

The start/stop behavior of the motor chosen dictates the total number of cycles attainable. This has a direct influence on the overall lifetime of the NPWT device.


Gardner Denver Thomas continues to set the standard for vacuum pumps used in NPWT therapy systems. Hereby, special attention is paid to the following pump characteristics:

  • a compact and lightweight design to improve patient mobility.
  • a low sound and vibration level to enhance patient comfort.
  • an energy efficient set-up for prolonged battery life.
  • a broad range tailored for acute, chronic or single-use applications.

Product lines within the Gardner Denver Thomas standard portfolio reflecting these attributes are:

Typical vacuum levels range from 45% for the 1014 product family up to 78% for the 1420 product group. Corresponding free flow values are 670 ml/min (1014 Series) and 11 l/min (1420 Series).


Thomas continues to set the standard for pumps used in negative pressure wound therapy.

By combining the efficiencies and operating characteristics of positive displacement diaphragm technology with lightweight chassis materials, we are able to meet the challenges of an evolving market for compact medical equipment. Our ability to introduce products to keep pace with market demands is key to our success.