초록 ▼

The invention relates to a portable and non-implantable device to enable a patient to self-administer, on demand, successive doses of a liquid while ensuring that the period of time between two successive administrations cannot be less than a reference value. The device has a liquid reservoir formed

The invention relates to a portable and non-implantable device to enable a patient to self-administer, on demand, successive doses of a liquid while ensuring that the period of time between two successive administrations cannot be less than a reference value. The device has a liquid reservoir formed in a piston which can be pushed in a chamber to expel the contents of the chamber via an injection outlet and which is returned in the opposite direction by a return. The liquid reservoir communicates with the inside of the chamber via a passage formed through the piston and is provided with a flow rate limiter so that the time required to fill the chamber corresponds to a reference value. The invention is suitable for medical applications.

대표청구항 ▼

[ It is claimed:] [1.] A portable and non-implantable device for enabling a patient to self-administer, on demand successive doses of a liquid while ensuring that the time period between two successive administrations cannot be less than a reference value determined by the dimensions of a capillary

[ It is claimed:] [1.] A portable and non-implantable device for enabling a patient to self-administer, on demand successive doses of a liquid while ensuring that the time period between two successive administrations cannot be less than a reference value determined by the dimensions of a capillary passage, the device comprising:a chamber provided with an injection outlet;valve means co-operating with said outlet for preventing already injected liquid from being sucked back into said chamber via said outlet;a rigid piston suitable for being pushed inside the chamber in the direction of said outlet, with lateral sealing around the piston, said piston including a bottom piston portion that penetrates into the chamber with lateral sealing and a top piston portion that contains a liquid reservoir that is fixed to the bottom portion by means enabling engagement and disengagement, and spring means for returning the piston in the opposite direction;means limiting the stroke of the piston in the opposite direction so that the volume of the chamber at the end of said stroke corresponds to the volume of a dose to be administered;the liquid reservoir having a capacity of several doses wherein the liquid reservoir is formed in the top piston portion and communicates with the inside of the chamber via a capillary passage formed through the bottom piston portion and whose dimensions are such that the filling time of the chamber by liquid being sucked from the reservoir under the effect of the suction caused in the chamber by return of the piston corresponds to the reference value; anda tubular case containing the piston and the chamber and closed by a removable cover preventing withdraw of the top piston portion, said cover having an opening leaving access to push the piston.