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Negative pressure wound therapy device. Negative-pressure wound therapy (NPWT), also known as a vacuum assisted closure (VAC), is a therapeutic technique using a suction pump, tubing, and a dressing to remove excess wound exudate and to promote healing in acute or chronic wounds and second- and third-degree burns.
Research conducted by Paul W. Brand, MD, in the 1940s and 50s, also in India, demonstrated that the wounds in the feet were caused by nerve damage (neuropathy) rather than infection, as previously thought. In his use of TCC to eliminate weight and pressure on the ulcers, he observed the healing of ulcers that had been present for a long time.
When the dressing is in contact with the wound, the wound discharge are retained to form gel which provides moist environment for wound healing. It protects the wound from bacterial contamination, absorbs wound discharge, and digests necrotic tissues. It is mostly use as secondary dressing. However, it is not used in wound with high discharge ...
Compression refers to wearing bandages, stockings, braces, or similar devices to apply pressure over a localized area to reduce swelling and stop bleeding. [1] [2] The increased pressure pushes fluids into the blood vessels to drain away from the area. [7] The effects of compression on swelling reduction are temporary and gravity-dependent. [18]
The collection device is typically a bulb with a drainage port which can be opened to remove fluid or air. After compressing the bulb to remove fluid or air, negative pressure is created as the bulb returns to its normal shape. Blake drain – a round silicone tube with channels that carry fluid to a negative pressure collection device.
Pressure ulcers can trigger other ailments, cause considerable suffering, and can be expensive to treat. Some complications include autonomic dysreflexia, bladder distension, bone infection, pyarthrosis, sepsis, amyloidosis, anemia, urethral fistula, gangrene and very rarely malignant transformation (Marjolin's ulcer – secondary carcinomas in chronic wounds).
Timing is important to wound healing. Critically, the timing of wound re-epithelialization can decide the outcome of the healing. [11] If the epithelization of tissue over a denuded area is slow, a scar will form over many weeks, or months; [12] [13] If the epithelization of a wounded area is fast, the healing will result in regeneration.
An increasingly common aid to both pre-operative wound maintenance and post-operative graft healing is the use of negative pressure wound therapy (NPWT). This system works by placing a section of foam cut to size over the wound, then laying a perforated tube onto the foam. The arrangement is then secured with bandages.
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