초록 ▼

A redundant, pneumatic driver for a blood pump in which a pair of pistons are contained in a common cylinder and their stroke rates and lengths are selectively controlled by a controller which non-invasively senses the circulatory system requirements of the patient in which the blood pump is implant

A redundant, pneumatic driver for a blood pump in which a pair of pistons are contained in a common cylinder and their stroke rates and lengths are selectively controlled by a controller which non-invasively senses the circulatory system requirements of the patient in which the blood pump is implanted. The controller varies the stroke rates and lengths to meet such requirements and further is able to selectively switch driving functions from one piston to the other to provide a redundant driving capability.

대표청구항 ▼

A piston pump for operating a chambered pneumatic blood pump comprising: ends, a hollow cylinder which is closed at both ends, a pair of pistons slidably mounted within the cylinder, said pistons and the interior wall of said cylinder defining a first chamber between the pistons and second and third

A piston pump for operating a chambered pneumatic blood pump comprising: ends, a hollow cylinder which is closed at both ends, a pair of pistons slidably mounted within the cylinder, said pistons and the interior wall of said cylinder defining a first chamber between the pistons and second and third chambers between the pistons and the ends of the cylinder, means for driving the pistons independently of, and in opposition to each other, and comprising means for sensing and calculating the volume of blood pumped by the blood pump during each stroke of at least one of said pistons and for controlling the driving speed of said piston to maintain a predetermined volume of blood flow, and a first pneumatic connection between first chamber of the blood pump and one of said first, second or third chambers of the piston pump.