Air shield keeps bacteria out of open wounds

October 10, 2011 By Kylie Witherel
A 3-D rendering of the Air Barrier System area of protection. The blue shaded part represents a 90 percent or greater reduction in airborne contamination over an area approximately 50.8 centimeters (20 inches) long by 15.24 cm (6 inches) wide. The grey zone represents the 80 percent or greater reduction area. Credit: Nimbic Systems, Inc.

This spring, Nimbic Systems, based near Houston, Texas, received Food and Drug Administration (FDA) clearance for the company's Air Barrier System, a unique medical device for reducing surgical-incision site contamination by infection-causing microorganisms.

The Air Barrier System, or ABS, creates a "cocoon" of highly pure air that surrounds a surgical incision site. The cocoon isolates the incision from ambient air to prevent the bacteria present in the operating room from infecting the patient.

During surgery, bacteria are continuously shed by operating room personnel into the air and can subsequently settle in and around an incision site. The organisms, such as Staphylococcus aureus, are a major cause of infections in prosthesis implant surgeries such as hip and knee replacements.

The ABS device

The portable ABS device prevents contamination without disrupting the surgical procedure or impeding access to the incision area, making the device relatively easy to use.

The ABS consists of two components: A non-sterile, reusable blower unit that provides the source of HEPA filtered air, and a sterile, disposable nozzle that is affixed onto the surgical drape adjacent to the incision.

In 2009, Nimbic Systems received funding from the National Science Foundation (NSF) to conduct ABS pilot trials, with the goal of determining the degree to which localized, directed HEPA flow generated by the ABS reduced the amount of airborne particulates and colony-forming bacteria in the surgical field during total hip arthroplasty.

Surgical intervention

Orthopedic joint arthroplasty, spinal procedures, thoracic and vascular procedures, and other long-duration procedures are high-risk for infection. Not only is the risk of harm to the patient a concern, but costs from the infections can reach up to $100,000.

The Air Barrier System nozzle pictured is deployed on the sterile field just prior to incision during a hip arthroplasty procedure. Credit: Nimbic Systems, Inc.

The results of the preliminary hip arthroplasty trial revealed that the ABS reduces the presence of microorganisms at the incision site by greater than 84 percent.

Based on the data obtained in the pilot trials, the approved the ABS for use in hip arthroplasty procedures, while future trials planned for later this year will investigate spine and femoral popliteal procedures.

Explore further: Joint replacement surgery riskier at hospitals with low surgical volume

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not rated yet Oct 10, 2011
It's like an air knife/air curtain, old idea used for a new application. Cool.

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