The vac that she is describing is a real wound vac. It is called the wasp. Just done by another company and you do not have to use foam. What you need is to use stoma past around the areas. Also you do not wrap the wasp tubing with dressing. You need to take the guaze dressing apply silver nitrate paste. Then you take the guaze with a Q-tip and layer the guaze in the wound. Packing lightly into areas that are tunneling. We are using this system now and have found that it is remarkable. It works just as good as the other companies vac but for half the cost. The original company cost is about $5000.00 per month. This vac costs less than $2000.00 per month I do have to agree that you need to make sure that there is not an infection.