Infusion set for administering a medicament delivered by an infusion pump which can be carried separately from the infusion set, a) the infusion set comprising a disposable part , a reusable part , and an electrically powered functional component , b) the disposable part comprising: b1) an adhesive underside for attachment at an infusion site on a person's skin, b2) a single lumen infusion cannula which projects from the underside and is the only skin piercing or penetrating element of the infusion set, b3) a first connector for fluidically connecting the cannula to the infusion pump, b4) and a second connector , c) and the reusable part comprising: c1) an energy source for electrically powering the functional component , c2) and a third connector mating with the second connector of the disposable part to interconnect the disposable part and the reusable part , d) wherein the reusable part is in the interconnected state fluidically isolated from the disposable part ; e) wherein the disposable part comprises a feeding line fluidically connecting an upstream end of the first connector with a downstream end of the cannula to feed and deliver the medicament via the disposable part and bypass the reusable part ; characterized in that f) the disposable part comprises a primary base member and a secondary base member which are formed separately and jointly fixed one to the other such as to jointly form a chamber suitable for disposing an air degasser in the medicament flow; and g) wherein: g1) the primary base member comprises the single lumen infusion cannula and the second connector ; and g2) the secondary base member comprises the first connector . a) the infusion set comprising a disposable part , a reusable part , and an electrically powered functional component , b) the disposable part comprising: b1) an adhesive underside for attachment at an infusion site on a person's skin, b2) a single lumen infusion cannula which projects from the underside and is the only skin piercing or penetrating element of the infusion set, b3) a first connector for fluidically connecting the cannula to the infusion pump, b4) and a second connector , b1) an adhesive underside for attachment at an infusion site on a person's skin, b2) a single lumen infusion cannula which projects from the underside and is the only skin piercing or penetrating element of the infusion set, b3) a first connector for fluidically connecting the cannula to the infusion pump, b4) and a second connector , c) and the reusable part comprising: c1) an energy source for electrically powering the functional component , c2) and a third connector mating with the second connector of the disposable part to interconnect the disposable part and the reusable part , c1) an energy source for electrically powering the functional component , c2) and a third connector mating with the second connector of the disposable part to interconnect the disposable part and the reusable part , d) wherein the reusable part is in the interconnected state fluidically isolated from the disposable part ; e) wherein the disposable part comprises a feeding line fluidically connecting an upstream end of the first connector with a downstream end of the cannula to feed and deliver the medicament via the disposable part and bypass the reusable part ; characterized in that f) the disposable part comprises a primary base member and a secondary base member which are formed separately and jointly fixed one to the other such as to jointly form a chamber suitable for disposing an air degasser in the medicament flow; and g) wherein: g1) the primary base member comprises the single lumen infusion cannula and the second connector ; and g2) the secondary base member comprises the first connector . g1) the primary base member comprises the single lumen infusion cannula and the second connector ; and g2) the secondary base member comprises the first connector . <EOS>