Abstract: A portable powered device such as a tool, comprising a housing within which is defined a combustion chamber (8) for combustion of a mixture of fuel and a combustion-supporting gas, which mixture is compressed so as to be subjected to a pressure in excess of the ambient atmospheric pressure prior to combustion, combustion of the fuel/combination-supporting gas mixture providing the power by which the device performs its intended task, and wherein the combustion and/or a further combustive event provides the power to compress a successive fuel/combination-supporting gas mixture, such that a successive cycle of operation of the device may be performed without requiring manual compression of a fuel-combustion-supporting gas mixture by the user.

Abstract: Disclosed is a portable device for delivering a medicament or the like into the body of a human or animal subject, the device comprising: a medicament compartment containing the medicament or the like to be delivered; delivery means comprising an orifice through which the medicament or the like is expelled from the device; and an internal combustion engine which provides the motive force by which the medicament is expelled from the device.