Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1998-08-20
2001-04-24
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Electric or magnetic motor
C623S003100
Reexamination Certificate
active
06220832
ABSTRACT:
BACKGROUND OF THE INVENTION
1 Field of the Invention
The invention relates to a centrifugal pump for delivering a fluid as well as to a centrifugal pump system. The invention relates in particular to a centrifugal pump and a centrifugal pump system for delivering blood.
2 Description of the Prior Art
WO-A-96/31934 teaches a rotary pump and especially a centrifugal pump in which the impeller is mounted to float inside the pump housing by magnetic forces, and driven by a rotating field generated by a stator located outside the pump housing. According to the principle of the so-called bearingless motor, the stator is designed as a bearing and drive stator and the rotor is integrated into the impeller and designed as a bearing and drive rotor. Pumps of this kind are especially advantageous for those applications in which the fluid to be delivered must not be contaminated, for example for delivering biological fluids such as blood or highly purified fluids such as super-pure water. Rotary pumps of this kind are also suitable for delivering aggressive fluids, which would destroy mechanical bearings in a short time. Centrifugal pumps of this kind are used, for example, as blood pumps to maintain circulation during open heart surgery. It is also possible to use such pumps as artificial hearts. In this case, it is necessary to use at least two separate pumps. One pump takes over the function of the left ventricle and keeps the systemic circulation functioning while the other pump takes over the function of the right ventricle and maintains the pulmonary circulation. The use of at least two separate pumps to perform the heart function, however, involves a relatively large space requirement that proves to be a limitation especially when it comes to implantation of such pumps as artificial hearts.
SUMMARY OF THE INVENTION
Hence, one goal of the present invention is to provide a centrifugal pump that can deliver the fluid in two different fluid systems. The centrifugal pump must be as compact as possible and permit a high delivery capacity. In particular, it must also be able to be used as a blood pump that can assume the function of the heart. Another goal of the invention is to provide a pump system that offers considerable safety against operating problems.
By the arrangement of the outlets according to the invention, namely offset from one another in the axial direction, the centrifugal pump according to the invention can assume the function of two pumps. By means of the first set of vanes, it delivers the fluid from the first inlet to the first outlet and by means of the second set of vanes delivers the fluid from the second inlet to the second outlet. Thus, the centrifugal pump according to the invention can deliver fluid in two different fluid systems.
The centrifugal pump system with at least two centrifugal pumps allows a considerable degree of safety. Each of the two centrifugal pumps alone can deliver the fluid into the two fluid systems so that even if one of the two centrifugal pumps should fail, the other centrifugal pump ensures the functionality of the centrifugal pump system. This redundancy is especially advantageous for medical applications.
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Robinson Daniel
Sulzer Electronics AG
Townsend and Townsend / and Crew LLP
Walberg Teresa
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