Sealless rotary blood pump

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/10 (2006.01) F04D 29/04 (2006.01) F04D 29/22 (2006.01) F16C 39/06 (2006.01)

Patent

CA 2240555

An implantable rotary sealless blood pump is provided. The pump includes a housing having an inlet tube on one end and an impeller casing on the other end. A rotor is mounted for rotation within the housing, with the rotor having an elongated shaft portion and an impeller attached to the shaft portion. The impeller is located within the impeller casing. Radial magnetic bearings are carried by the shaft portion and radial magnetic bearings are carried by the housing for maintaining the shaft portion of the rotor within the inlet tube of the housing. A rotor motor includes a plurality of permanent magnets carried by the impeller and a motor stator including an electrically conductive coil located within the housing. A ring of back iron is carried by the impeller to aid in completing a flux return path for the permanent magnets. A plurality of hydrodynamic thrust bearings are located outside of the axis of rotation of the rotor. The impeller uses large axially thick blade sectors with narrow blood channels extending through the impeller, to minimize hemolysis and to increase the working surface of the blades.

Pompe à sang rotative et sans joint d'étanchéité implantable. La pompe comprend un logement doté d'un tube d'entrée sur une extrémité et d'un caisson de turbine sur l'autre. Un rotor, muni d'un arbre rotor allongé sur lequel est fixée une turbine, est monté de façon à pouvoir tourner dans le logement. La turbine se situe dans un caisson de turbine. Des paliers magnétiques radiaux sont fixés à l'arbre du rotor et au logement afin de maintenir le rotor à l'intérieur du tube d'entrée du logement. Un moteur actionnant le rotor comprend une série d'aimants permanents montés sur la turbine et un stator comportant une bobine conduisant l'électricité située dans le logement. Un anneau de contrefer est supporté par la turbine afin d'aider à compléter un trajet de retour de flux pour les aimants permanents. Une série de paliers de butée hydrodynamiques sont situés à l'extérieur de l'axe de rotation du rotor. La turbine comporte des pales axiales larges et épaisses ayant des passages étroits pour le sang qui se prolongent dans la turbine afin de réduire au minimum l'hémolyse et pour accroître la surface active des pales.

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