An Axial Feedback Control Magnetic Suspension Axial Blood Pump
A technology of feedback control and magnetic levitation axis, applied in blood pumps, control devices, other medical devices, etc., can solve the problems of insufficient blood flushing, blood flow flushing in suspension gaps, increased thrombus formation, etc., to improve the blood flushing effect , Improve working stability and reduce local friction
Active Publication Date: 2019-10-22
FUWAI HOSPITAL CHINESE ACAD OF MEDICAL SCI & PEKING UNION MEDICAL COLLEGE
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Problems solved by technology
It can be seen from the figure that there is a crack-like suspension gap between the hub of the leading vane and the hub of the rear vane and the hub of the impeller. Since the hub of the leading vane is embedded with an electromagnetic bearing winding and iron core to realize axial feedback control of magnetic levitation, its diameter is not easy to shrink. The end face is large, so that the blood flow in the suspension gap is not flushed well
In order to ensure a strong axial suspension stiffness, the front suspension gap and the rear suspension gap must be as small as possible, which further leads to the inability of the blood in the crack-like structure to be fully flushed, which becomes a "dead zone" with extremely slow blood flow, which increases the formation of thrombus chance of
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[0028] The axial feedback control magnetic suspension axial blood pump of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0029] The radial displacement of the impeller is limited by the permanent magnetic suspension force, and the axial position of the impeller is limited by the electromagnetic force controlled by feedback; It is composed of magnetic suspension bearing, rear radial magnetic suspension bearing, axial electromagnetic bearing, position sensor and axial feedback control circuit. Depend on figure 1 and figure 2 It can be seen that the axial flow pump of the axial feedback control magnetic levitation axial flow blood pump consists of a tubular pump barrel 4 and a front guide vane, an impeller, a rear guide vane and a drive motor stator and a front radial magnetic levitation bearing located outside the pump barrel 4. , Rear radial magnetic suspension bearing, axial electromagnetic bearing. The...
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The invention relates to an axial feedback control magnetic levitation axial flow pump. The impeller hub is embedded with a front rotor radial suspension magnet, a rear rotor radial suspension magnet, and a drive motor rotor; the pump cylinder wall is surrounded by a front axial control Windings, the front stator radial suspension magnetic ring, the rear stator radial suspension magnetic ring and the rear axial control winding, are connected with the front axial control magnet, the front rotor radial suspension magnet, the rear rotor radial suspension magnet and the rear axial control magnet respectively. The magnet position corresponds. The front radial magnetic suspension bearing and the rear radial magnetic suspension bearing of the impeller are formed. The front axial control magnet and the rear axial control magnet limit the axial position of the impeller hub under the control of the front axial control winding and the rear axial control winding. Hall sensors are embedded in the front end of the rear diversion cone, and output position signals to the axial feedback control circuit.
Description
technical field [0001] The invention relates to an axial feedback control magnetic levitation axial flow blood pump in the field of biomedical engineering. Background technique [0002] Cardiac assist device is an effective means to treat advanced heart failure, and axial flow blood pump has many advantages as a heart assist device that can be implanted in the human body for a long time, and has developed rapidly in recent years. The only moving part of the axial blood pump is the high-speed rotating "impeller", and the bearing supporting the "impeller" is one of the key technologies. The ideal axial flow blood pump bearing can work continuously in the blood for a long time, is not blocked by precipitated protein, does not have a large amount of frictional heat to cause local temperature rise, has no mechanical wear and has good blood compatibility. Ball bearings cannot be used in axial flow blood pumps because the bearings are soaked in blood, the rolling of the rolling el...
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IPC IPC(8): A61M1/12A61M60/178A61M60/237A61M60/411A61M60/538A61M60/82
CPCA61M2210/125A61M60/82A61M60/422A61M60/148A61M60/411A61M60/237A61M60/178A61M60/538
Inventor李国荣朱晓东
OwnerFUWAI HOSPITAL CHINESE ACAD OF MEDICAL SCI & PEKING UNION MEDICAL COLLEGE