CN215309684U - Miniature magnetic liquid suspension centrifugal blood pump - Google Patents
Miniature magnetic liquid suspension centrifugal blood pump Download PDFInfo
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- CN215309684U CN215309684U CN202023242675.7U CN202023242675U CN215309684U CN 215309684 U CN215309684 U CN 215309684U CN 202023242675 U CN202023242675 U CN 202023242675U CN 215309684 U CN215309684 U CN 215309684U
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Abstract
The utility model relates to a miniature magnetic liquid suspension centrifugal blood pump, which is a device integrating a pump and a motor, and the blood pump comprises: the device comprises a pump shell, a rotor, an impeller, a servo motor, an inner magnetic core group, an outer magnetic ring group, a limiting device and a sewing snap ring device; the rotor and the impeller are connected into a whole in a seamless mode, the rotor is arranged in an inner tube of the blood pump, and the rotor is driven by the servo motor to drive the impeller to do work; the inner magnetic core group is arranged at the lower end in the rotor, the outer magnetic ring group and the wrapping sleeve are arranged in the lower shell of the pump cavity, and the combination of the inner magnet and the outer magnet can generate the radial magnetic suspension effect of the impeller; the ceramic plate and the ceramic cone form a limiting temporary bearing; the top of the impeller blade is provided with an inclined surface, and liquid suspension can be generated when the pump works. According to the technical scheme, the rotor impeller can stably work in a suspension mode, and the friction effect of a mechanical bearing is overcome; the structure in the pump is simple and smooth, and hemolysis and thrombosis complications can be greatly reduced; the blood pump has small volume, light weight and small invasion in operation, and can improve safety and practicability.
Description
Technical Field
The embodiment of the specification relates to the technical field of medical instruments, in particular to a miniature magnetic liquid suspension centrifugal blood pump.
Background
The artificial heart uses mechanical power to replace or assist the pumping work of the heart with human failure, so the artificial heart is also called as 'blood pump' for short, and provides a new treatment means for treating patients with late-stage heart failure. The blood pumps applied to the international market at present mainly comprise a centrifugal blood pump and an axial-flow blood pump, the two types of blood pumps can be divided into a bearing type structure and a suspension type structure according to an internal structure, the blood pump with the bearing type structure is generally called as a second-generation blood pump, and the main defects are as follows: the bearing is easy to wear, and the service life of the blood pump is seriously limited; suspension type structure is generally called third generation blood pump, magnetic suspension or liquid suspension, and this kind of structure that does not have the bearing though long service life, does not have friction heat production and local blood stream and detains the region, can be better prevent thrombosis, but also has new problem: firstly, the magnetic suspension structure is complex, a detection, feedback and control system is required to be added, the volume of the blood pump is increased, and the operation invasiveness is increased, for example, the volume and weight of a third-generation magnetic suspension blood pump HeartMate III are more than three times that of a second-generation blood pump Jarvik 2000; secondly, the internal fluid mechanical structure is complex, so that the dead angle of blood flow is difficult to overcome, and thrombus is easily formed in the dead angle.
Therefore, the volume and the weight of the suspension type blood pump are reduced, the internal structure of the pump is simplified, and complications such as hemolysis and thrombus are reduced, so that the suspension type blood pump is a difficult problem to solve.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiments of the present specification is to overcome the defects of the prior art, and provide a miniature magnetic liquid suspension centrifugal blood pump with small volume, light weight and simple structure.
In order to achieve the above purpose, the embodiments of the present specification adopt the following technical solutions:
a miniature magnetic-fluid suspension centrifugal blood pump comprising: the device comprises a pump shell, a rotor, an impeller, a servo motor, an inner magnetic core group, an outer magnetic ring group, a limiting device and a sewing snap ring device; the rotor is connected with the impeller in a seamless mode, the rotor is arranged in an inner tube of the blood pump, and the rotor is driven by the servo motor to drive the impeller to do work;
the inner magnetic core group comprises a plurality of circular magnetic sheets and is arranged at the lower end of the inner part of the rotor, and the outer magnetic ring group comprises a plurality of magnetic rings and is arranged in the lower end of the pump shell and surrounds the inner magnetic core group;
the limiting device comprises a ceramic wafer and a ceramic cone, the ceramic wafer is embedded in the lower end of the rotor impeller, and the ceramic cone is arranged in the lower end of the pump shell and is right opposite to the ceramic wafer in the middle.
Optionally, the blood pump further comprises: and the sewing snap ring device is arranged outside the pump shell and used for fixing the blood pump and the apex of the heart.
Optionally, the inner magnetic core group consists of three circular magnetic sheets, and the outer magnetic ring group consists of three magnetic rings; or
The inner magnetic core group consists of four round magnetic sheets, and the outer magnetic ring group consists of four magnetic rings; or
The inner magnetic core group consists of five circular magnetic sheets, and the outer magnetic ring group consists of five magnetic rings; or
The inner magnetic core group consists of six round magnetic sheets, and the outer magnetic ring group consists of six magnetic rings.
Optionally, the inner magnetic core group and the outer magnetic ring group are all bonded together by strong magnetic neodymium iron boron materials with like poles repelling each other.
Optionally, the inclined surface at the middle part of the top of the impeller is of a liquid suspension structure.
Optionally, the impeller is sheet-shaped and includes a plurality of blades, and the root of each blade is connected to the rotor.
Optionally, the impeller comprises 3-5 blades.
Optionally, the pump housing comprises: an inlet conduit, a pump cavity cover and a pump cavity lower shell;
the inlet pipeline comprises an outer sleeve and an inner pipe;
the outer sleeve and the inner tube are of a coaxial structure, the inlet ends of the outer sleeve and the inner tube are directly connected, and the other end of the outer sleeve and the inner tube is connected to the pump cavity cover;
the outer surface of the outer sleeve is provided with a circle of sand blasting titanium powder coating;
the pump cavity cover is annular and is concentrically connected with the inner pipe, and the excircle of the pump cavity cover is connected with the lower pump cavity shell;
the inner bottom of the pump cavity lower shell is provided with a circular boss, and the side edge of the pump cavity lower shell is provided with a pump outlet.
Optionally, the servo motor includes rotor magnetic steel, a stator core and a stator winding;
the rotor magnetic steel is arranged in the rotor, and the stator core and the stator winding are arranged on the inner wall of the inlet pipeline, namely, the stator core and the stator winding are arranged between the inner pipe and the outer sleeve;
the rotor magnetic steel and the rotor are integrated, and the stator core and the stator winding are integrated with the inlet pipeline.
Optionally, the servo motor further comprises a telecommunication transmission line, one end of the telecommunication transmission line is connected with the stator winding, and the other end of the telecommunication transmission line extends out of the body and is connected with the control system.
Optionally, the sewing snap ring device comprises a sewing ring and a snap ring mechanism, and the snap ring mechanism comprises a hook ring and a base ring.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects:
the suspension in the embodiment of the specification is passive permanent magnetic suspension, complex detection, feedback and control systems are not needed, the structure is simple, the performance is stable, and the technical reliability and the use safety of the blood pump can be greatly improved; the volume and the weight of the blood pump are smaller, so that the operation invasion of the blood pump can be reduced, and the practicability is improved; the full-suspension blood pump has simple and smooth internal structure, avoids dead space or dead angle, and can effectively prevent thrombosis
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic cross-sectional view of a micro magnetic-fluid suspension centrifugal blood pump according to an embodiment of the present disclosure;
FIG. 2 is a sectional view of a combination of an outer magnetic ring set and an inner magnetic core set provided in an embodiment of the present disclosure;
fig. 3 is a schematic perspective view of a magnetic ring sleeve provided in an embodiment of the present disclosure;
fig. 4 is a force analysis three-dimensional schematic diagram of a rotor and an impeller provided in the embodiments of the present disclosure.
The reference numbers illustrate: rotor magnetic steel-1, stator core-2, stator winding-3, outer magnetic ring group-4, spacer-4.1, inner magnetic core group-5, telecommunication transmission line-6, inner tube-7, outer sleeve-8, titanium powder coating-9, magnetic ring sleeve-10, sleeve pin-10.1, rotor-11, impeller-12, inclined plane-13, ceramic sheet-14, ceramic cone-15, round boss-16, wedge-shaped groove-17, pump cavity lower shell-18, pump cavity cover-19, pump outlet-20, pump inlet-21, sewing ring-22, soft magnetic sheet-23, gasket-24, snap ring mechanism-25, hook ring-25.1, base ring 25.2, first backward axial force-F1, second backward axial force-F2, magnetic core-5, magnetic core-6, electric wire-2, magnetic core-6, electric wire-electric wire, etc A third rearward axial force-F3, a forward axial force-F4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described in detail below. It is to be understood that the embodiments described are only some of the embodiments of the specification and not all of them. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the examples in the present specification fall within the scope of protection of the examples in the present specification.
The following further describes the concrete implementation of the embodiment with reference to the attached drawings of the embodiment in the specification.
Referring to fig. 1 to 4, an embodiment of the present specification provides a miniature magnetic-fluid suspension centrifugal blood pump, including: pump unit, servo motor, suspension spacing system and suture snap ring device.
The pump device comprises a pump housing, a rotor 11 and an impeller 12.
The pump housing comprises an inlet conduit, a pump chamber cover 19 and a pump chamber lower shell 18.
The inlet conduit comprises an inner tube 7 and an outer sleeve 8.
The inner tube 7 and the outer sleeve 8 are coaxial, the inlet ends of the inner tube and the outer sleeve are directly connected, the other end of the inner tube and the outer sleeve is connected to a pump cavity cover 19, and the joint is welded seamlessly and is leakproof.
The outer circle of the outer sleeve 8 is roughened, and a circle of sand blasting titanium powder coating-9 is arranged, so that a closed-loop inner membrane can be formed at the heart apex socket in time.
A cavity is formed between the outer sleeve 8 and the stator core 2, so that the heat-resistant and cooling effects can be achieved, and the safety of the blood pump and the motor is improved.
The pump cavity cover 19 is annular, the central opening is concentrically connected with the inner tube 7, the excircle is connected with the pump cavity lower shell 18, and the joint needs to be welded and is leak-proof.
The pump cavity cover 19 is fastened to the pump cavity lower shell 18 after the internal parts are mounted, and the pump cavity cover is sealed and welded.
The rotor 11 and the impeller 12 are seamlessly connected into a whole.
The rotor 11 is driven by the servo motor to drive the impeller 12 to do work, so that blood continuously flows in from the pump inlet 21 and flows out from the pump outlet 20 after being centrifuged.
The impeller 12 is composed of 4 hollow blades, and the blades are uniformly distributed at the root of the rotor 11 and are connected with the root of the rotor into a whole in a seamless mode.
The servo motor mainly comprises rotor magnetic steel 1, a stator iron core 2, a stator winding 3 and a telecommunication transmission line 6.
The rotor magnetic steel 1 is arranged in the rotor 11; stator core 2 and stator winding 3 cover on inner tube 7 outer wall, and rotor magnet steel 1 radially occupies the central point that stator core 2 and stator winding 3 set put, and axial position, rotor magnet steel 1 forward direction skew.
The telecommunication transmission line 6 is used for transmitting electric energy and electric signals, one end of the telecommunication transmission line is connected with the stator winding 3, and the other end extends out of the body and is connected with the control system.
Because the servo motor and the pump device are integrated into a whole, the pump-motor integration is formed.
The suspension limiting system comprises a magnetic suspension combination, a liquid suspension structure and a limiting device.
The magnetic suspension combination comprises an inner magnetic core group 5 and an outer magnetic ring group 4, and the inner magnetic core group and the outer magnetic ring group are matched to enable the rotor and the impeller to realize radial magnetic suspension.
The inner magnetic core group 5 is formed by overlapping three round magnetic sheets with the same axle center and is internally arranged at the lower end in the rotor; the outer magnetic ring group 4 is formed by coaxially overlapping three magnetic rings, the magnetic rings are not in direct contact with the magnetic rings, a thin spacer 4.1 with the same size is adhered between the magnetic rings, the magnetic ring group 4 is wrapped in a magnetic ring sleeve 10, the magnetic ring sleeve 10 is provided with a plurality of sleeve feet 10.1, and the sleeve feet 10.1 are embedded in a pump cavity lower shell 18.
The magnetic directions of the circular magnetic sheets or magnetic rings of the inner magnetic core group 5 and the outer magnetic ring group 4 are axial, and the circular magnetic sheets or magnetic rings are bonded together forcibly according to the opposite homopolarity.
Optionally, the inner magnetic core group 5 may be formed by combining four circular magnetic sheets, and the outer magnetic ring group 4 is formed by combining four magnetic rings; or the inner magnetic core group 5 is formed by combining five round magnetic sheets, and the outer magnetic ring group 4 is formed by combining five magnetic rings; or the inner magnetic core group 5 is formed by combining six round magnetic sheets, the outer magnetic ring group 4 is formed by combining six magnetic rings, and when the inner magnetic core group 5 and the outer magnetic ring group 4 are installed, the positions are basically aligned in the middle.
Preferably, the magnetic materials of the inner magnetic core group 5 and the outer magnetic ring group 4 are strong magnetic neodymium iron boron.
Between rotor magnet steel 1 and interior magnetic core group 5, set up soft magnetic sheet 23 and packing ring 24, can play magnetic screen and anti-interference effect, can improve magnetic suspension effect and blood pump work efficiency. Wherein, the soft magnetic sheet 23 is made of magnetic conductive material such as silicon steel, iron and the like, and the gasket 24 is made of non-magnetic conductive material.
Stop device includes ceramic wafer 14 and ceramic awl 15, and ceramic wafer 14 inlays the lower extreme of rotor wheel 12, ceramic awl 15 are inlayed in the boss 16 of pump chamber inferior valve to it is just right to live in with ceramic wafer 14, when the blood pump is in static or low-speed state, under the pressure effect that receives rotor wheel, ceramic awl 15 withstands ceramic wafer 14, can play a set of interim slide bearing effect, the start-up of spacing impeller and support blood pump that can be fine.
The liquid suspension structure is that the top middle part of impeller 12 is the slope, and it is the slope that flows to the limit from the entry in the middle of the blade top promptly to the limit of backflowing, this inclined plane 13 with the internal surface of pump chamber lid 19 forms the wedge space to there is the border with the top surface parallel and level in the both sides of inclined plane, can prevent the liquid stream excessive, and when the blood pump during operation, under the effect of centrifugal force, there is the liquid stream to get into at wedge-shaped groove 17, because of receiving the extrusion and producing the hydraulic pressure, axial force pushes away impeller 12, makes it can not contact with pump chamber lid 19 all the time.
Optionally, the inclined surface 13 has an inclination angle of 1-10 °.
Sew up the snap ring device and be close to the root of pump chamber lid 19 at outer sleeve 8, including sewing up ring 22 and snap ring mechanism 25, be used for connecting apex of heart and blood pump to fixed blood pump, earlier sew up base ring 25.2 on the apex of heart during the operation, insert the ventricle with the pump entry from the hole after punching, crack when colluding ring 25.1 and hang base ring 25.2, the blood pump has just been fixed.
After the miniature magnetic liquid suspension centrifugal blood pump provided by the embodiment of the specification is stably started, analysis needs to be carried out on how the rotor impeller realizes suspension operation, and the suspension can be decomposed into radial suspension and axial suspension.
The radial suspension is mainly realized by magnetic suspension combination, the inner magnetic core group 5 and the outer magnetic ring group 4 are radially repelled by magnetic force, and the repulsion force can sufficiently overcome and balance various radial forces, so that the rotor impeller is always limited at the center of the inner tube 7 and the pump cavity, and the gyroscope dead axle effect is added when the rotor impeller rotates, thereby obtaining good radial magnetic suspension effect.
Axial suspension is liquid suspension, and how to realize the axial suspension needs to be analyzed, the blood pump can be influenced by a plurality of axial forces when working at high speed, wherein the axial forces can be divided into weak axial force and strong axial force, the weak axial force mainly comprises the axial component of the gravity of a rotor impeller and the axial force of other factors, and the weak axial force is a weak influence factor; the strong axial force mainly comprises four axial forces, which can be analyzed from fig. 4, wherein F4 is a forward axial force (pointing to the pump inlet), F1, F2 and F3 are three backward axial forces (facing away from the pump inlet), and F1 is generated because the motor iron core always has an automatic restraining force on the motor magnetic steel to axially center the motor magnetic steel, and when the magnetic steel moves forward relative to the iron core, the magnetic steel is subjected to backward pulling force, and when the magnetic steel moves backward relative to the iron core, the magnetic steel is subjected to forward pulling force, and in this illustrative example, the rotor magnetic steel 1 moves forward, so F1 is an axial backward force, which is small and has no relation with the rotating speed of the pump; f2 is the axial component of the impulse force generated by the fluid momentum on the impeller, and the force is positively correlated with the rotating speed; f3 is the axial component of the pressure exerted by the hydraulic pressure on the inclined surface 13 of the impeller 12, the force magnitude is in positive geometric correlation with the rotation speed, but in negative correlation with the magnitude of the wedge-shaped space; f4 is generated by the pressure difference between the low hydraulic pressure of the inner surface and the suction inlet of the pump cavity cover 19 and the high hydraulic pressure of the lower cover surface when the pump works, the force is rapidly increased along with the increase of the pump rotating speed after the pump is started, when the rotating speed reaches a certain height and F4 is greater than the sum of F1, F2 and F3, F4 drives the rotor impeller and the ceramic chip 14 to be separated from the ceramic cone 15 and axially move forwards, the wedge space is reduced along with the approach of the wheel to the pump cavity cover 19, the generated hydraulic pressure axial component F3 is increased in geometric progression, F3 can automatically resist F4, when the resultant force balance of the axial force is reached, the rotor impeller is forced to stop axial displacement, F3 is not increased any more, that is, in a certain rotating speed range, the axial force of the rotor impeller can be automatically balanced, and is automatically axially suspended.
As described above, the rotor impeller can realize stable suspension operation by combining radial magnetic suspension and axial liquid suspension.
The technical effects that can be achieved by the embodiments of the present description are as follows:
compared with the existing mechanical bearing blood pump, the blood pump disclosed by the embodiment of the specification has the advantages that in the suspension state when the blood pump works normally, the bearings have no friction, the hemolysis can be reduced, the service life of the blood pump is prolonged, and the thrombosis complications triggered by friction heating can be reduced.
Compared with the existing magnetic suspension blood pump, the suspension of the embodiment of the specification is passive permanent magnet suspension, complex detection, feedback and control systems are not needed, the structure is simpler, the performance is stable, and the technical reliability and the use safety of the blood pump can be greatly improved; the volume and the weight of the blood pump are smaller, so that the operation invasion of the blood pump can be reduced, and the practicability is improved; the internal structure of the full-suspension blood pump is simple and smooth, dead cavities or dead corners are avoided, and thrombosis can be effectively prevented.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A miniature magnetic liquid suspension centrifugal blood pump, comprising: the device comprises a pump shell, a rotor, an impeller, a servo motor, an inner magnetic core group, an outer magnetic ring group, a limiting device and a sewing snap ring device; the rotor is connected with the impeller in a seamless mode, the rotor is arranged in an inner tube of the blood pump, and the rotor is driven by the servo motor to drive the impeller to do work;
the inner magnetic core group comprises a plurality of circular magnetic sheets and is arranged at the lower end of the inner part of the rotor, and the outer magnetic ring group comprises a plurality of magnetic rings and is arranged in the lower end of the pump shell and surrounds the inner magnetic core group;
the limiting device comprises a ceramic wafer and a ceramic cone, the ceramic wafer is embedded in the lower end of the rotor impeller, and the ceramic cone is arranged in the lower end of the pump shell and is right opposite to the ceramic wafer in the middle.
2. The blood pump of claim 1, further comprising: and the sewing snap ring device is arranged outside the pump shell and used for fixing the blood pump and the apex of the heart.
3. The blood pump according to claim 1, wherein said inner magnetic core set is composed of three circular magnetic sheets, and said outer magnetic ring set is composed of three magnetic rings; or
The inner magnetic core group consists of four round magnetic sheets, and the outer magnetic ring group consists of four magnetic rings; or
The inner magnetic core group consists of five circular magnetic sheets, and the outer magnetic ring group consists of five magnetic rings; or
The inner magnetic core group consists of six round magnetic sheets, and the outer magnetic ring group consists of six magnetic rings.
4. The blood pump of claim 1, wherein said inner magnetic core set and said outer magnetic ring set are both strongly bonded together by like-pole repulsion of strong magnetic neodymium iron boron material.
5. The blood pump of claim 1, wherein the inclined surface at the top middle portion of the impeller is of a liquid suspension structure.
6. The blood pump of claim 1, wherein said impeller is in the form of a blade comprising a plurality of blades, said blade roots being attached to said rotor.
7. The blood pump of claim 6, wherein said impeller comprises 3-5 blades.
8. The blood pump of claim 1, wherein said pump housing comprises: an inlet conduit, a pump cavity cover and a pump cavity lower shell;
the inlet pipeline comprises an outer sleeve and an inner pipe;
the outer sleeve and the inner tube are of a coaxial structure, the inlet ends of the outer sleeve and the inner tube are directly connected, and the other end of the outer sleeve and the inner tube is connected to the pump cavity cover;
the outer surface of the outer sleeve is provided with a circle of sand blasting titanium powder coating;
the pump cavity cover is annular and is concentrically connected with the inner pipe, and the excircle of the pump cavity cover is connected with the lower pump cavity shell;
the inner bottom of the pump cavity lower shell is provided with a circular boss, and the side edge of the pump cavity lower shell is provided with a pump outlet.
9. The blood pump of claim 8, wherein said servo motor comprises rotor magnetic steel, a stator core and a stator winding;
the rotor magnetic steel is arranged in the rotor, and the stator core and the stator winding are arranged on the inner wall of the inlet pipeline, namely, the stator core and the stator winding are arranged between the inner pipe and the outer sleeve;
the rotor magnetic steel and the rotor are integrated, and the stator core and the stator winding are integrated with the inlet pipeline.
10. The blood pump of claim 9, wherein said servo motor further comprises a telecommunications line connected at one end to said stator windings and extending outside the body to a control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023242675.7U CN215309684U (en) | 2020-12-29 | 2020-12-29 | Miniature magnetic liquid suspension centrifugal blood pump |
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| CN202023242675.7U CN215309684U (en) | 2020-12-29 | 2020-12-29 | Miniature magnetic liquid suspension centrifugal blood pump |
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| CN215309684U true CN215309684U (en) | 2021-12-28 |
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| CN202023242675.7U Active CN215309684U (en) | 2020-12-29 | 2020-12-29 | Miniature magnetic liquid suspension centrifugal blood pump |
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