Rechargeable implantable device for dosed and repeated self-injection of medicament

Claim 1

Device for repeated injection of medicament (20) in unitary doses and at a frequency which is a function of therapeutic treatment needs, said device being implantable in a body of a patient and comprising: a site (5) for injection of the medicament (20) implantable below the skin (1) of the patient; an external supplying means for supplying said site (5); a catheter (13), implantable in a therapeutic action zone of the patient, for injecting each unitary dose of medicament; a reservoir (6), made from a flexible plastic material, for storing the medicament, between two restocking operations, by means of said external supplying means and through said site (5); a first connection tube (7), made from a flexible plastic material, for connecting said reservoir (6) to said site (5); a pre-dosed balloon (10) made from a flexible plastic material; a second tube (9) for connecting between said balloon (10) and said reservoir (6), said second tube (9) also being made from a flexible plastic material; a capillary, for controlling the flowrate of a medicament disposed upstream of said balloon (10), positioned between said balloon (10) and said reservoir (6), so as to control the filling time of said balloon (10); valve means (16), disposed between said balloon (10) and said catheter (13), responsive only to pressure exerted on said balloon (10), said balloon (10) having a volume which is a function of the unitary dose of medicament to be injected through said catheter (13) by pressure exerted upon said balloon (10) by cutaneous digital deformation and forming means for controlling the injection of medicament in cooperation with said valve means (16); said valve means (16) comprising a valve rod, a clamping means for holding said valve rod and means for initiating slackening of said clamping means of said valve rod as a result of fluid pressure of medicament exerted by a cutaneous digital control of said balloon (10).