Patent ID: 7291133

Claim:
A device for administering in doses, in particular infusing, a medicinal liquid, comprising: a) a housing comprising a housing connecting section comprising a proximal end and a distal end, and a container from which the medicinal liquid is displaced through an outlet in doses, to be administered, wherein the housing connecting section connects the outlet to a catheter, the catheter having a front end that is or can be connected to an administering needle, wherein the rear end of the catheter is attached to the proximal end of the housing connecting section, the distal end of the housing connecting section is screwed in or on or fixed with a snap-in lock to an outlet section which extends the outlet, and wherein the proximal end of the housing connecting section and the distal end of the housing connecting section are connected by a thread or a snap-fit connection; b) a valve positioned in the housing connecting section and arranged in a flow cross-section of the medicinal liquid, and which in order to prevent self-emptying only allows a through-flow towards the end of said catheter when the liquid pressure acting in this direction is greater than a pressure bearing on said valve as a result of the inherent weight of a liquid column in the device, wherein c) the medicinal liquid is displaced through the outlet by advancing a stopper; and d) the housing connecting section is detachably connected to the outlet and carries a connecting needle such that said connecting needle pierces a membrane sealing the outlet when the housing connecting section is connected.