초록 ▼

An implantable infusion pump (20) for infusing drugs or other chemical or solutions into the body. A movable diaphragm (26) forming a variable volume drug chamber (22). A fluid piston (32) opposing the force exerted by the diaphragm (26) on the drug solution in the drug chamber (22). The pressure of

An implantable infusion pump (20) for infusing drugs or other chemical or solutions into the body. A movable diaphragm (26) forming a variable volume drug chamber (22). A fluid piston (32) opposing the force exerted by the diaphragm (26) on the drug solution in the drug chamber (22). The pressure of the fluid piston (32) being controlled by a regulator (33) providing a reference pressure and in fluid communication with the fluid piston (32). The regulator (33) reducing the fluid pressure of the piston fluid (32) as drug solution is expelled from the drug chamber (22) so as to maintain a constant pressure differential between the drug chamber (22) and an infusion site in the body. The implantable infusion pump (20) being readily adaptable to variable or electronic flow control.

대표청구항 ▼

An infusion pump for implantation in a living body, comprising: (a) a housing having a variable volume, drug chamber for holding a drug solution; (b) outlet port means for conducting the drug solution from the drug chamber to a first site outside the housing; (c) inlet port means for introducing the

An infusion pump for implantation in a living body, comprising: (a) a housing having a variable volume, drug chamber for holding a drug solution; (b) outlet port means for conducting the drug solution from the drug chamber to a first site outside the housing; (c) inlet port means for introducing the drug solution into the drug chamber from a second site outside the housing; (d) force means including a diaphragm for exerting a force on the drug solution in the drug chamber; (e) fluid piston means for opposing the force exerted by the diaphragm of the force means on the drug solution; and (f) regulator means for regulating the pressure of the fluid of the piston means such that a constant total force is exerted on the drug solution in the drug chamber.