CN107261231A - A kind of Axial feedback controls magnetic levitation axial flow blood pump - Google Patents
A kind of Axial feedback controls magnetic levitation axial flow blood pump Download PDFInfo
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- CN107261231A CN107261231A CN201710612183.6A CN201710612183A CN107261231A CN 107261231 A CN107261231 A CN 107261231A CN 201710612183 A CN201710612183 A CN 201710612183A CN 107261231 A CN107261231 A CN 107261231A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/408—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable
- A61M60/411—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being mechanical, e.g. transmitted by a shaft or cable generated by an electromotor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
- A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/538—Regulation using real-time blood pump operational parameter data, e.g. motor current
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/82—Magnetic bearings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
- A61M2210/125—Heart
Abstract
Control to be embedded with preceding rotor radial suspension magnet, rear rotor radial levitated magnet, and motor rotor in magnetic levitation axial flow blood pump, impeller hub the present invention relates to a kind of Axial feedback；Pump barrel wall outsourcing is wound with front axle to controling winding, front stator radial suspension magnet ring, stator radial suspension magnet ring and rear axial controling winding, corresponding to control magnet, preceding rotor radial suspension magnet, rear rotor radial levitated magnet and rear axially control magnet positions with front axle respectively afterwards.Form preceding radial magnetic bearing, the rear radial magnetic bearing of impeller.Front axle is to control magnet, rear axially control magnet in front axle to controling winding, the axial location of rear axial controling winding lower control limit impeller hub.The front end in water conservancy diversion vertebra embeds Hall sensor afterwards, and outgoing position signal to Axial feedback controls circuit.
Description
Technical field
Magnetic levitation axial flow blood pump is controlled the present invention relates to a kind of Axial feedback of biomedical engineering field.
Background technology
Heart-assist device is the effective means for treating advanced heart failure, and axial flow blood pump is as can be chronically implanted the heart of human body
Dirty servicing unit has many advantages, quickly grows in recent years.The unique motion part of axial flow blood pump is to rotate " leaf at a high speed
Wheel ", and it is one of key technology to support the bearing of " impeller ".Preferable axial flow blood pump bearing is can long-term continuous work in blood
Make, albumen is not deposited and is blocked, causes local temperature to raise without a large amount of frictional heats, no mechanical wear simultaneously has good blood
Liquid phase capacitive.Ball bearing cannot be used for axial flow blood pump, because bearing immersion is in blood, it is thin that the rolling of rolling element can destroy blood
Proteinosis can ultimately result in ball blocking in born of the same parents, and blood.Sliding bearing is using between two smooth surfaces contacted with each other
Relative motion realize the support to impeller.The physical property in two Mechanical Contact faces, including hardness, wearability are corrosion-resistant
Property, finish, lubricating condition etc. influences whether the working condition of bearing, " ball-and-socket " structure being made of high hardness material
Although formula sliding bearing obtains preferable application effect in axial flow blood pump, there is presently no perfectly for blood environment
Sliding bearing, still can not entirely prevent mechanical friction and abrasion.As can be seen here, the exploration of the bearing arrangement of axial flow blood pump is improved
Have great importance.
Combine the technology of suspension support impeller using magnetic suspension or " magnetic-liquid ", be completely removed the mechanical support point of impeller,
Develop rapidly in recent years." magnetic-liquid ", which suspends, does not need special control system, and noenergy consume can not increase heart during implementation
The volume of servicing unit, these unique advantages make it obtain relatively successfully application, " the HeartWare HVAD " in such as U.S.
Heart-assist device.But, the shortcoming of " magnetic-liquid " joint suspension technology is to need to set " stream between impeller and pump housing endophragm
Body levitation gap ", this gap is that generation fluid dynamic suspension institute is indispensable, because excessive liquid levitation gap is often led to
Impeller suspended is unstable, so levitation gap should not be too big.Narrow and small levitation gap can increase local shear forces, aggravate blood thin
The destruction of born of the same parents, can also result in hematoblastic a large amount of activation, and this shortcoming limits the Optimal improvements for improving blood pump blood compatibility.
Further, since the required precision of levitation gap is high, so processing and manufacturing cost is also difficult to reduce.
Larger levitation gap can be formed using complete magnetic suspension structure, the destruction of blood component is reduced.According to physics
Principle is learned, realizing the five degree of freedom full magnetic suspension of rotary blade needs at least on a freedom of motion direction using feedback electricity
Magnetic control mechanism is, it is necessary to sensor, signal transacting and feedback control circuit system；In axial flow blood pump, the magnetic suspension of rotor is compared
Difficulty, realizes that efficient axis needs to set the electromagnetism wheel hub with feedback regulation performance at the two ends of rotor to feedback control, because
The wheel hub end face of this impeller hub and forward and backward stator is larger, " crack sample " levitation gap can be formed between opposite face, this gap is often
As being difficult " dead band " washed away by liquid stream, it is easy to thrombosis.Germany " Berlin Heart INCOR " axial-flow pumps are mesh
Preceding to be applied to clinical magnetic levitation axial flow blood pump, its Axial feedback used control magnetic suspension structure is possible to reduce pump
Interior blood flow washes away.Fig. 4 is similar to " patent of invention (the patent Shen of Berlin Heart INCOR " axial-flow pump structures for another
Please the A of publication No. CN 102151341) schematic diagram.As seen from the figure, deposited between leading impeller boss and rear guide vane wheel hub and impeller hub
In crack sample levitation gap, due to be embedded with leading impeller boss realize Axial feedback control maglev electromagnetic bearing winding and
Iron core, its diameter is difficult to reduce, and end face is larger, levitation gap blood flow is washed away bad.To ensure stronger axial suspension rigidity,
Preceding levitation gap and rear levitation gap must be as small as possible, and further resulting in the blood in the spline structure of crack can not fully be rushed
Brush, it is extremely slow " dead band " as blood flow, add thrombotic probability.
In order to avoid the formation of blood flow " dead band " in blood pump, the present invention provides a kind of novel axial feedback control magnetic suspension shaft
Bleed pump, using pump case external stator magnet ring suspension technology, different from existing magnetic levitation axial flow blood pump, supported for magnetic suspension
Forward and backward stator radial suspension magnet ring and axle are arranged on outside the pump case of axial-flow pump to controling winding with cyclic structure, are made
The wheel hub of forward and backward stator and impeller hub opposite end are conical, and levitation gap reduces, blood flow washes away improvement；Realizing simultaneously
While stable rotor radial suspends, rotor axial levitation position is continually changing under program, makes blood in levitation gap
Liquid constantly updates flowing, and pump inner structure obtains more fully blood flow and washed away, and prevents thrombosis.
The content of the invention
In order to improve the performance of implantable cardiac servicing unit, the present invention provides a kind of Axial feedback control magnetic levitation axial flow
Blood pump.
Concrete technical scheme of the present invention is as follows：
The present invention provides a kind of Axial feedback control magnetic levitation axial flow blood pump, using the radial direction of permanent magnet suspension power restriction impeller
Displacement, the axial location of the electromagnetism power restriction impeller of feedback regulation；By axial-flow pump pump barrel, motor stator, motor turn
Son, impeller, pilot blade, rear guide vane, preceding radial magnetic bearing, rear radial magnetic bearing, axial electromagnetic bearings, position sensing
Device and Axial feedback control circuit composition.
Further to improve, motor stator core, motor stator winding surround outside the wall of axial-flow pump pump barrel,
Impeller is arranged on embedding motor rotor in the intracavitary of axial-flow pump pump barrel, impeller hub；Motor rotor radial magnetizes, can
The rotation of torque impeller is obtained under the rotating excitation field effect that motor stator core, motor stator winding are produced；
Motor rotor can avoid the magnetic force interference to forward and backward radial magnetic bearing using the structure of two pairs of magnetic poles.
Further to improve, preceding radial magnetic bearing is by front stator radial suspension magnet ring and preceding rotor radial suspension magnet
Composition, preceding rotor radial suspension magnet is cylindric, is made up of permanent-magnet material, axial charging is embedded in impeller hub, is located at
Before motor rotor, its axis and pump barrel axis concentric co-axial；Front stator radial suspension magnet ring is annular shape, by permanent magnetism
Material is made, and length is equal with preceding rotor radial suspension magnet, and axial charging surrounds outside axial-flow pump pump barrel, fixed positioned at motor
Sub- front end and pump barrel axis concentric co-axial；Front stator radial suspension magnet ring position is corresponding with preceding rotor radial suspension magnet, and
Magnetic pole is collectively aligned with preceding rotor radial suspension magnet；Between front stator radial suspension magnet ring and preceding rotor radial suspension magnet
Magnetic repulsion makes the front end of impeller be in radial suspension state, radial magnetic bearing before being formed.
Further to improve, rear radial magnetic bearing is by rear stator radial suspension magnet ring and rear rotor radial levitated magnet
Composition, rear rotor radial levitated magnet is cylindric, is made up of permanent-magnet material, axial charging is embedded in impeller hub, is located at
After motor rotor, its axis and pump barrel axis concentric co-axial；Stator radial suspension magnet ring is annular shape afterwards, by permanent magnetism
Material is made, and length is equal with rear rotor radial levitated magnet, and axial charging surrounds outside axial-flow pump pump barrel, fixed positioned at motor
Sub- rear end and pump barrel axis concentric co-axial；Stator radial suspension magnet ring position is corresponding with rear rotor radial levitated magnet afterwards, and
Magnetic pole is collectively aligned with rear rotor radial levitated magnet；Afterwards between stator radial suspension magnet ring and rear rotor radial levitated magnet
Magnetic repulsion makes the rear end of impeller be in radial suspension state, radial magnetic bearing after formation.
It is further to improve, axial electromagnetic bearings from front axle to control magnet, rear axially control magnet, front axle to control around
Group, rear axial controling winding, Hall sensor and Axial feedback control circuit composition；Front axle is controlled to control magnet, rear axial direction
Magnet is cylindric, is made up of permanent-magnet material, axial charging is embedded in impeller hub, positioned at impeller hub two ends, its axis
With pump barrel axis concentric co-axial；Front axle is to controling winding, axial controling winding is the solenoid concentric with axial-flow pump pump barrel afterwards,
Surround outside axial-flow pump pump barrel, its axial location and axle overlap to control magnet, electric current by when can be to front axle to control
Magnet processed, rear axially control magnet produce axial magnetic force.
Further improvement, front axle is axially controlled to control magnet, rear axially control magnet and front axle to controling winding, afterwards
The axial length of winding can be adjusted as needed, and increase front axle can increase axial direction to control magnet, rear axially control magnet length
Magnetic force adjustment gradient；Front axle is to controlling magnet, rear axially control magnet cylindric, coniform or cylinder and circular cone are combined into
Frustum, when current axially control magnet, the top of rear axially control magnet are coniform, conical sections are embedded in impeller wheel
In the centrum on the top of hub two.
Further to improve, the front end in rear water conservancy diversion vertebra is embedded with Hall sensor, by axially controlling magnetic after perception
The axial location signal of impeller hub is changed into electric signal by the magnetic field intensity of body, is output to Axial feedback control circuit.
Further to improve, Hall sensor can also be embedded in leading impeller boss, can also preceding water conservancy diversion vertebra, after lead
Hall sensor is embedded in stream vertebra simultaneously to strengthen the positioning precision to impeller axial location.
Further to improve, the electric signal that Axial feedback control circuit can be transmitted according to Hall sensor determines the axle of impeller
To position, and according to the axial position adjustments of the impeller intensity that axially forwardly controling winding, rear axial controling winding are fed and direction,
The constant of impeller axial location is maintained by negative feedback control mechanisms.
Further to improve, front end face, the rear end face of impeller hub are centrum shape, the front end face of preceding water conservancy diversion vertebra and rear end
The front end face and rear end face of face and rear water conservancy diversion vertebra are also centrum shape, the precentrum of impeller hub, postcentrum top respectively with
Preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra centrum top it is relative, the gap between two tops forms preceding levitation gap, rear levitation gap, suspends
Gap reduces, blood flow washes away improvement；
It is preferred that, the preceding water conservancy diversion vertebra magnet of embedding, rear water conservancy diversion vertebra magnet in preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra, in impeller hub
Front axle can produce magnetic pull between control magnet, the rear top for axially controlling magnet, further constrain impeller, prevent its two
The radial displacement at end；
It is preferred that, control circuit to set the axial suspension location point of different impellers by Axial feedback, make impeller
Realize and suspend in different axial locations；Preceding levitation gap, the width of rear levitation gap, which are continually changing, makes blood in gap not
It is disconnected to update, flow, the formation in the slow area of liquid stream can be avoided, while realizing that stable rotor radial suspends, rotor axial hangs
Trim is put to be continually changing under program, blood in levitation gap is constantly updated flowing；
It is preferred that, the top end surface coating high abrasion high mechanical properties of preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra and impeller hub it is thin
Film, when the acceleration force that impeller is born exceedes axial magnetic suspension intensity, the top of preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra and impeller hub
The Mechanical Contact at end can prevent the axial displacement of impeller.
It is provided by the present invention have high performance senior heat make Axial feedback control magnetic levitation axial flow blood pump, its have with
Lower advantage：
1. the present invention replaces mechanical bearing to support impeller by magnetic suspension bearing, bearing local friction can be reduced, part is prevented
Heat production and temperature rise, extending shaft are bled the pump work life-span；Using the radial displacement of permanent magnet suspension power restriction impeller, using feedback
The axial location of the electromagnetism power restriction impeller of regulation and control；It is motor stator, motor rotor, impeller, preceding by axial-flow pump pump barrel
Stator, rear guide vane, preceding radial magnetic bearing, rear radial magnetic bearing, axial electromagnetic bearings, position sensor and axial direction are anti-
Feedback control circuit composition.Constitute front stator radial suspension magnet ring, rear stator radial suspension magnet ring and the composition of radial permanent magnet bearing
The front axle of axial electromagnetic bearings is arranged on outside the pump case of axial-flow pump to controling winding, rear axial controling winding with cyclic structure,
Pump inner structure is simplified, blood flow scouring effect is improved, thrombosis can be better protected from, job stability is improved.
Brief description of the drawings
Fig. 1 is the vertical section structural map that Axial feedback of the present invention controls magnetic levitation axial flow blood pump one embodiment；
Fig. 2 is that Axial feedback of the present invention controls magnetic levitation axial flow blood pump suspended impeller and levitation gap schematic perspective view；
Fig. 3 is between Axial feedback of the present invention controls the axially different levitation position of magnetic levitation axial flow blood pump suspended impeller and suspended
Gap volume change schematic diagram；
Fig. 4 is the structural representation of prior art magnetic suspension manual heart pump.
In Fig. 1, Fig. 2, Fig. 3：1. pump intake, water conservancy diversion vertebra before 2., water conservancy diversion vertebra magnet before 3., 4. pump barrels, 5. pilot blade blades,
6. front axle is to controling winding, 7. front stator radial suspension magnet rings, 8. motor stator cores, 9. motor stator winding,
10. after stator radial suspension magnet ring, axial controling winding after 11., 12. rear guide vane blades, water conservancy diversion vertebra after 13., water conservancy diversion vertebra after 14.
Magnet, 15. pump discharges, 16. Hall sensors, levitation gap after 17. axially controls rotor radial behind magnet, 19. to hang after 18.
Floating magnet, 20. motor rotors, 21. impeller blades, rotor radial suspension magnet before 22., 23. front axles to control magnet,
24. before levitation gap, 25. impeller hubs.
Embodiment
The Axial feedback control magnetic levitation axial flow blood pump of the present invention is described further with reference to the accompanying drawings and examples.
The axial position of the electromagnetism power restriction impeller of feedback regulation is used using the radial displacement of permanent magnet suspension power restriction impeller
Put；By axial-flow pump pump barrel, motor stator, motor rotor, impeller, pilot blade, rear guide vane, preceding axial magnetic axle
Hold, rear radial magnetic bearing, axial electromagnetic bearings, position sensor and Axial feedback control circuit are constituted.By Fig. 1 and Fig. 2
It can be seen that pump barrel 4 and the pilot blade that is located therein of the axial-flow pump of Axial feedback control magnetic levitation axial flow blood pump by tubulose, impeller, after
Stator and surround motor stator and preceding radial magnetic bearing, rear radial magnetic bearing, the axial magnetic outside pump barrel 4
Bearing is constituted.Impeller is made up of impeller blade 21 and impeller hub 25.Impeller is in preceding radial magnetic bearing, rear radial direction magnetcisuspension
Floating axle is held, realize five-freedom degree full-suspension under the co- controlling of axial electromagnetic bearings.Pilot blade is by pilot blade blade 5 and preceding water conservancy diversion
Vertebra 2 is constituted, and is connected by pilot blade blade 5 with the inwall of pump barrel 4.Rear guide vane is by 13 groups of rear guide vane blade 12 and rear water conservancy diversion vertebra
It is connected with the inwall of pump barrel 4 into and by rear guide vane blade 12.Axial charging is embedded with preceding water conservancy diversion vertebra 2, rear water conservancy diversion vertebra 13
Preceding water conservancy diversion vertebra magnet 3, rear water conservancy diversion vertebra magnet 14, preceding water conservancy diversion vertebra magnet 3, the top of rear water conservancy diversion vertebra magnet 14 and impeller hub
The front axle of axial charging in 25 is relative to control magnet 23, the rear top for axially controlling magnet 18, and with opposite pole correspondence
Arrangement, can limit the radial displacement of the front end, rear end of impeller hub 25 by magnetic pull.Removed in impeller hub 25 and be embedded with front axle
To outside control magnet 23, rear axially control magnet 18, preceding rotor radial suspension magnet 22, rear rotor radial suspension magnetic are also embedded with
Body 19, and motor rotor 20；The position of motor rotor 20 is corresponding with the motor position of stator outside the wall of pump barrel 4.
The motor stator of the wall outer wrap of pump barrel 4 is made up of motor stator core 8, motor stator winding 9；
Front end, the rear end of the external motor stator of the wall of pump barrel 4 are also surrounded with front axle to controling winding 6, front stator radial suspension magnet ring
7, rear stator radial suspension magnet ring 10 and rear axial controling winding 11, respectively with the front axle that is embedded in impeller hub 25 to control
Magnet 23, preceding rotor radial suspension magnet 22, rear rotor radial levitated magnet 19 are corresponding with rear axially control magnet 18 position.
Front stator radial suspension magnet ring 7 and preceding rotor radial suspension magnet 10 are high performance permanent magnetic materialses composition and axial charging, length
Degree is equal and with homopolarity arranged opposite, and the radial displacement of the front end of impeller hub 25 is limited by magnetic repulsion, is formed before impeller
Radial magnetic bearing.Stator radial suspension magnet ring 10 and rear rotor radial levitated magnet 19 are also high performance permanent magnetic materialses group afterwards
Into, axial charging, equal length and with homopolarity arranged opposite, pass through the radial direction position that magnetic repulsion limits the rear end of impeller hub 25
Move, form the rear radial magnetic bearing of impeller.The forward and backward radial magnetic bearing of impeller radial displacement is limited except by preceding
Stator radial suspension magnet ring 7, rear stator radial suspension magnet ring 10 and preceding rotor radial suspension magnet 22, rear rotor radial suspension magnetic
Radial magnetic force between body 19 repels the outer front axle for additionally using impeller hub two ends to control magnet 23, rear axially control magnet 18
Magnetic pull between top and preceding water conservancy diversion vertebra magnet 3, the rear top of water conservancy diversion vertebra magnet 14 further limits impeller radial displacement, can carry
High impeller axial magnetic stability.Front axle is to control magnet 23, rear axially control magnet 18 by high performance permanent magnetic materialses group
Into and axial charging, can make axis direction of the impeller along pump barrel 4 is forward and backward to move by magneticaction in the presence of axial magnetic field.
Front axle is corresponding to controling winding 6 and front axle to control magnet 23 position, have in current axial controling winding 6 electric current by when can be
Axial magnetic field is produced in pump barrel 4, the axial location of impeller hub 25 is controlled by the magneticaction with front axle to control magnet 23,
Axial electromagnetic bearings before being formed.Axial controling winding 11 and rear axially control magnet 18 position are corresponding afterwards, when after axial direction control around
Have in group 11 electric current by when can be by further control the axle of impeller hub 25 with the rear magneticaction for axially controlling magnet 18
To position, axial electromagnetic bearings after formation improve the intensity of axial magnetic control.
Front end in rear water conservancy diversion vertebra 13 is embedded with Hall sensor 16, by the magnetic field that magnet 18 is axially controlled after perception
The axial location signal of impeller hub 25 is changed into electric signal by intensity, is output to Axial feedback control circuit and (is not drawn in figure
Go out).Axial feedback controls electric current of the circuit according to this Signal Regulation front axle into controling winding 6, rear axial controling winding 11 strong
Degree and direction, to ensure that impeller is in axial suspension state.Circuit is controlled to set different impellers by Axial feedback
Axial suspension location point, suspended to make impeller be realized in different axial location.As shown in Figure 3：Axial feedback control electricity
Road can regularly change the axial suspension location point of impeller under input programme-control, make preceding levitation gap 24, rear levitation gap 17
Width be continually changing.The axial suspension position biased forwards of impeller hub 25, impeller hub 25 during B location during location A
Axial suspension position is offset backward, causes levitation gap because the width of preceding levitation gap 24, rear levitation gap 17 is continually changing
In volume change, blood is inhaled into gap when levitation gap width increases, and gap width becomes hour blood and is extruded gap, by
Blood in this gap is continuously updated, flowed, and can avoid the formation in the slow area of liquid stream, prevent thrombosis.
The power-driven system of the magnetic levitation axial flow pump is made up of motor stator and motor rotor 20, driving electricity
Machine stator includes motor stator core 8 and motor stator winding 9；Motor stator winding 9 is three-phase windings,
Rotating excitation field can be produced when order is fed promotes motor rotor 20 to rotate, and power is provided for impeller, operation principle with directly
Flow permanent magnetic brushless identical.Motor rotor 20 is made up of high performance permanent magnetic materialses, and using two pairs of magnetic poles, to make drive
Dynamic magnetic force between rotor 20 and front stator radial suspension magnet ring 7, rear stator radial suspension magnet ring 10 is with axis pair
Claim, eliminate due to the radial direction deflecting force of impeller caused by magneticaction, prevent 20 pairs of radial direction permanent magnet suspension systems of motor rotor
The magnetic force interference of system, improves the stability of impeller radial suspension.
Embodiment described above is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is entered
Row is limited, on the premise of design spirit of the present invention is not departed from, and those of ordinary skill in the art make to technical scheme
In the various modifications gone out and improvement, the protection domain that claims of the present invention determination all should be fallen into.
Claims (10)
1. a kind of Axial feedback controls magnetic levitation axial flow blood pump, it is characterised in that using the radial direction of permanent magnet suspension power restriction impeller
Displacement, the axial location of the electromagnetism power restriction impeller of feedback regulation；By axial-flow pump pump barrel, motor stator, motor turn
Son, impeller, pilot blade, rear guide vane, preceding radial magnetic bearing, rear radial magnetic bearing, axial electromagnetic bearings, position sensing
Device and Axial feedback control circuit composition.
2. Axial feedback according to claim 1 controls magnetic levitation axial flow blood pump, it is characterised in that motor stator iron
Core, motor stator winding surround outside the wall of axial-flow pump pump barrel, and impeller is arranged on the intracavitary of axial-flow pump pump barrel, impeller hub
Middle embedding motor rotor；Motor rotor radial magnetizes, can be in motor stator core, motor stator winding
The rotating excitation field effect of generation is lower to obtain the rotation of torque impeller；Motor rotor can be kept away using the structure of two pairs of magnetic poles
Exempt from the magnetic force interference to forward and backward radial magnetic bearing.
3. Axial feedback according to claim 1 controls magnetic levitation axial flow blood pump, it is characterised in that preceding axial magnetic axle
Hold and be made up of front stator radial suspension magnet ring and preceding rotor radial suspension magnet, preceding rotor radial suspension magnet to be cylindric, by
Permanent-magnet material is made, axial charging, is embedded in impeller hub, before motor rotor, its axis and pump barrel axis
Line concentric co-axial；Front stator radial suspension magnet ring is annular shape, is made up of permanent-magnet material, length and preceding rotor radial suspension magnet
Equal, axial charging surrounds outside axial-flow pump pump barrel, positioned at motor stator front end and pump barrel axis concentric co-axial；Front stator
Radial suspension magnet ring position is corresponding with preceding rotor radial suspension magnet, and magnetic pole is collectively aligned with preceding rotor radial suspension magnet；
Magnetic repulsion between front stator radial suspension magnet ring and preceding rotor radial suspension magnet makes the front end of impeller be in radial suspension
State, radial magnetic bearing before being formed.
4. Axial feedback according to claim 1 controls magnetic levitation axial flow blood pump, it is characterised in that rear axial magnetic axle
Hold and be made up of rear stator radial suspension magnet ring and rear rotor radial levitated magnet, rear rotor radial levitated magnet to be cylindric, by
Permanent-magnet material is made, axial charging, is embedded in impeller hub, after motor rotor, its axis and pump barrel axis
Line concentric co-axial；Stator radial suspension magnet ring is annular shape afterwards, is made up of permanent-magnet material, length and rear rotor radial levitated magnet
Equal, axial charging surrounds outside axial-flow pump pump barrel, positioned at motor stator rear end and pump barrel axis concentric co-axial；Stator afterwards
Radial suspension magnet ring position is corresponding with rear rotor radial levitated magnet, and magnetic pole is collectively aligned with rear rotor radial levitated magnet；
The magnetic repulsion between stator radial suspension magnet ring and rear rotor radial levitated magnet makes the rear end of impeller be in radial suspension afterwards
Radial magnetic bearing after state, formation.
5. Axial feedback according to claim 1 controls magnetic levitation axial flow blood pump, it is characterised in that axial electromagnetic bearings by
Front axle controls magnet, front axle to controling winding, rear axial controling winding, Hall sensor and axial direction to control magnet, rear axial direction
Feedback control circuit is constituted；Front axle is made up of permanent-magnet material, axially filled to controlling magnet, rear axial direction to control magnet to be cylindric
Magnetic, is embedded in impeller hub, positioned at impeller hub two ends, its axis and pump barrel axis concentric co-axial；Front axle to control around
Group, rear axial controling winding are the solenoid concentric with axial-flow pump pump barrel, are surrounded outside axial-flow pump pump barrel, its axial location with
Axle overlaps to control magnet, electric current by when to control magnet, rear axially control magnet can produce axial magnetic to front axle
Active force.
6. Axial feedback according to claim 5 controls magnetic levitation axial flow blood pump, it is characterised in that front axle is to control magnetic
Body, rear axially control magnet and front axle can be adjusted as needed to the axial length of controling winding, rear axial controling winding, be increased
Front axle can increase axial magnetic regulating gradient to control magnet, rear axially control magnet length；Front axle to control magnet, it is rear axially
It is the frustum that cylindric, coniform or cylinder and circular cone are combined into control magnet, current axially control magnet, rear axially control
When the top of magnet is coniform, conical sections are embedded in the centrum on the top of impeller hub two.
7. Axial feedback according to claim 5 controls magnetic levitation axial flow blood pump, it is characterised in that in rear water conservancy diversion vertebra
Front end is embedded with Hall sensor, by axially controlling the magnetic field intensity of magnet after perception by the axial location signal of impeller hub
It is changed into electric signal, is output to Axial feedback control circuit.
8. Axial feedback according to claim 5 controls magnetic levitation axial flow blood pump, it is characterised in that Hall sensor also may be used
To be embedded in leading impeller boss, Hall sensor can also be embedded simultaneously in preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra to strengthen to leaf
Take turns the positioning precision of axial location.
9. Axial feedback according to claim 5 controls magnetic levitation axial flow blood pump, it is characterised in that Axial feedback control electricity
The electric signal that road can be transmitted according to Hall sensor determines the axial location of impeller, and according to the axial position adjustments of impeller to front axle
To controling winding, the intensity of rear axial controling winding feed and direction, impeller axial location is maintained by negative feedback control mechanisms
It is constant.
10. Axial feedback according to claim 1 controls magnetic levitation axial flow blood pump, it is characterised in that before impeller hub
End face, rear end face are centrum shape, the front end face and rear end face of preceding water conservancy diversion vertebra and the front end face and rear end face of rear water conservancy diversion vertebra
It is centrum shape, the precentrum of impeller hub, postcentrum top are relative with the centrum top of preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra respectively,
Gap between two tops forms preceding levitation gap, rear levitation gap, and levitation gap reduces, blood flow washes away improvement；
It is preferred that, the preceding water conservancy diversion vertebra magnet of embedding, rear water conservancy diversion vertebra magnet in preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra, before in impeller hub
Magnetic pull axially can be produced between control magnet, the top of rear axially control magnet, impeller is further constrained, prevents its two ends
Radial displacement；
It is preferred that, control circuit to set the axial suspension location point of different impellers by Axial feedback, make impeller not
Same axial location, which is realized, to suspend；Preceding levitation gap, the width of rear levitation gap, which are continually changing, makes the blood in gap continuous more
Newly, flow, the formation in the slow area of liquid stream can be avoided, while realizing that stable rotor radial suspends, rotor axial suspension position
Put and be continually changing under program, blood in levitation gap is constantly updated flowing；
It is preferred that, the film of the top end surface coating high abrasion high mechanical properties of preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra and impeller hub, when
When the acceleration force that impeller is born exceedes axial magnetic suspension intensity, the top of preceding water conservancy diversion vertebra, rear water conservancy diversion vertebra and impeller hub
Mechanical Contact can prevent the axial displacement of impeller.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710612183.6A CN107261231B (en) | 2017-07-25 | 2017-07-25 | A kind of Axial feedback control magnetic levitation axial flow blood pump |
| PCT/CN2017/095713 WO2019019206A1 (en) | 2017-07-25 | 2017-08-25 | Magnetic suspension axial flow blood pump with axial feedback control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710612183.6A CN107261231B (en) | 2017-07-25 | 2017-07-25 | A kind of Axial feedback control magnetic levitation axial flow blood pump |
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| Publication Number | Publication Date |
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| CN107261231A true CN107261231A (en) | 2017-10-20 |
| CN107261231B CN107261231B (en) | 2019-10-22 |
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| CN201710612183.6A Active CN107261231B (en) | 2017-07-25 | 2017-07-25 | A kind of Axial feedback control magnetic levitation axial flow blood pump |
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| WO (1) | WO2019019206A1 (en) |
Cited By (9)
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| CN108144146A (en) * | 2018-01-25 | 2018-06-12 | 兰州兰飞医疗器械有限公司 | A kind of implantable unilateral side axis self-balancing micro-axial blood pump |
| CN109904955A (en) * | 2019-02-20 | 2019-06-18 | 北京工业大学 | A kind of integration external artificial heart's driving device |
| CN111001056A (en) * | 2019-12-31 | 2020-04-14 | 上海市东方医院（同济大学附属东方医院） | Magnetic suspension axial flow type blood pump |
| WO2020164371A1 (en) * | 2019-02-14 | 2020-08-20 | 苏州心擎医疗技术有限公司 | Stiffness gain mechanism for magnetic suspension bearing, magnetic suspension bearing, and blood pump |
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| CN108144146A (en) * | 2018-01-25 | 2018-06-12 | 兰州兰飞医疗器械有限公司 | A kind of implantable unilateral side axis self-balancing micro-axial blood pump |
| WO2020164371A1 (en) * | 2019-02-14 | 2020-08-20 | 苏州心擎医疗技术有限公司 | Stiffness gain mechanism for magnetic suspension bearing, magnetic suspension bearing, and blood pump |
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| CN109904955A (en) * | 2019-02-20 | 2019-06-18 | 北京工业大学 | A kind of integration external artificial heart's driving device |
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| CN113546297A (en) * | 2021-07-14 | 2021-10-26 | 清华大学 | Implanted miniature magnetic suspension axial flow blood pump |
| CN113546297B (en) * | 2021-07-14 | 2022-06-17 | 清华大学 | Implanted miniature magnetic suspension axial flow blood pump |
| CN113623269A (en) * | 2021-08-19 | 2021-11-09 | 鑫磊压缩机股份有限公司 | Moving impeller of magnetic suspension axial flow fan |
| CN113750364A (en) * | 2021-09-24 | 2021-12-07 | 北京航空航天大学 | Implanted magnetic suspension axial flow blood pump |
| CN114754069A (en) * | 2022-03-15 | 2022-07-15 | 格瑞拓动力股份有限公司 | Radial magnetic suspension bearing self-adaptive dead zone control method and system |
| CN114754069B (en) * | 2022-03-15 | 2023-12-12 | 格瑞拓动力股份有限公司 | Self-adaptive dead zone control method and system for radial magnetic suspension bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019019206A1 (en) | 2019-01-31 |
| CN107261231B (en) | 2019-10-22 |
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