Pressure regulated implantable infusion pump

Details Pressure regulated implantable infusion pump Pressure regulated implantable infusion pump

A - Human Necessities

61

M

128/80

A61M 5/00 (2006.01) A61M 5/142 (2006.01)

Patent

CA 1262325

-22- ABSTRACT OF THE DISCLOSURE 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.

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