In the weeks after my right kidney was taken out, I did some research on "wound vac" equipment. Wound Care staff told me it would accelerate healing by drawing fluid out of the incision site and promoting blood flow to the surrounding tissue.
I couldn't afford the $1000-$2000 weekly rental, and I wanted to see if there was a cheaper alternative. There were several writeups about Danielle Zurovcik and her inexpensive hand-operated vac. Her invention was tested in the field in the aftermath of the 2010 Haiti earthquake. The team was only there for ten days, so they couldn't test for quicker healing. But the dressing and negative pressure did keep wounds cleaner than a traditional dressing and allowed for less-frequent dressing changes.
Her invention is the first product from her new company, WiCare (Worldwide Innovative Healthcare Inc.), which aims to get medical devices to those least able to afford them. If I'm reading things correctly, that includes here in the States.