Blood pump

By placing the magnet on the rotating shaft in the blood pump, spaced axially from the stator column, the problems of increased impeller weight and machining difficulty are solved, output power and torque are improved, radial dimensions are reduced, and a more efficient impeller design is achieved.

CN119838131BActive Publication Date: 2025-10-17SHENZHEN CORE MEDICAL TECH CO LTD
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Patent Information

Application Number
CN202510177431.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-12-22
Publication Date
2025-10-17
Estimated Expiration
2040-12-22

AI Technical Summary

Technical Problem

In existing blood pumps, the magnets on the impeller increase the weight of the impeller and reduce the pumping efficiency. In addition, the size and shape of the impeller are limited by the magnets, which increases the difficulty of processing.

Method used

The magnet is placed on the rotating shaft and spaced axially from the column of the stator. The axial distance between the magnet and the column is 0.1mm to 2mm. The axial magnetic flux direct drive method is adopted, which increases the magnetic density between the magnet and the stator. The impeller design is not affected by the magnet, which reduces the machining difficulty of the impeller.

Benefits of technology

The output power and torque of the blood pump were increased, the radial dimension of the drive unit was reduced, the design flexibility of the impeller was increased, and the machining difficulty was reduced.

✦ Generated by Eureka AI based on patent content.
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Abstract

The application provides a blood pump, which comprises a sleeve, an impeller arranged in the sleeve and a driving unit for rotating the impeller, the sleeve has a blood inflow port and a blood outflow port, the driving unit comprises a housing, a rotor and a stator arranged in the housing, the proximal end of the sleeve is connected to the housing, the rotor comprises a rotating shaft which extends out of the housing and is connected to the impeller, the rotor further comprises at least one magnet assembled on the rotating shaft, the stator comprises a plurality of columns arranged around the axis of the rotating shaft and a coil winding arranged around the periphery of each column, the coil winding generates a rotating magnetic field which interacts with the magnet to rotate the rotating shaft, the magnet and the column are arranged in axial spacing, and the axial spacing between the magnet and the column is 0.1mm-2mm. The blood pump of the application can increase the output power and load torque of the driving unit on the basis of reducing the overall radial size of the blood pump.
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