A sealed puncture device having an adhesive material around its perimeter for attachment to a backing layer of a dressing and incorporating one or more vanes or blades to create one or more punctures as a conduit for negative pressure maintained by a substantial seal and delivering negative pressure to a wound surface. The device may comprise a ported vacuum tube fixed to it such that the vacuum pressure is communicated to the wound. Actuation of the puncture may occur by application of negative pressure, or manual manipulation. Described as being a device to be adhered to the backing component of any one of various available moist wound healing dressings in order to convert them into negative pressure dressings.
