CN115400343B - Rotor structure of artificial blood pump - Google Patents
Rotor structure of artificial blood pump Download PDFInfo
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- CN115400343B CN115400343B CN202211211436.6A CN202211211436A CN115400343B CN 115400343 B CN115400343 B CN 115400343B CN 202211211436 A CN202211211436 A CN 202211211436A CN 115400343 B CN115400343 B CN 115400343B
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- impeller
- permanent magnet
- magnet assembly
- cover
- rotor
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- 239000002473 artificial blood Substances 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims description 32
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 33
- 239000000725 suspension Substances 0.000 abstract description 20
- 230000005389 magnetism Effects 0.000 abstract description 2
- 239000008280 blood Substances 0.000 description 51
- 210000004369 blood Anatomy 0.000 description 51
- 230000017531 blood circulation Effects 0.000 description 12
- 206010019280 Heart failures Diseases 0.000 description 7
- 230000005484 gravity Effects 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004083 survival effect Effects 0.000 description 2
- 206010024119 Left ventricular failure Diseases 0.000 description 1
- 206010037368 Pulmonary congestion Diseases 0.000 description 1
- 230000008081 blood perfusion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003205 diastolic effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 230000005750 disease progression Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 208000019622 heart disease Diseases 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 210000000115 thoracic cavity Anatomy 0.000 description 1
Classifications
-
- 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
-
- 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
- A61M60/196—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body replacing the entire heart, e.g. total artificial hearts [TAH]
-
- 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
- A61M60/419—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being permanent magnetic, e.g. from a rotating magnetic coupling between driving and driven magnets
-
- 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
- A61M60/804—Impellers
-
- 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
- A61M60/804—Impellers
- A61M60/806—Vanes or blades
-
- 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
- A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
- A61M60/857—Implantable blood tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/066—Floating-units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/20—Mounting rotors on shafts
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/04—General characteristics of the apparatus implanted
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Mechanical Engineering (AREA)
- Cardiology (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Engineering & Computer Science (AREA)
- External Artificial Organs (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a rotor structure of an artificial blood pump, which comprises an impeller, wherein the impeller comprises an impeller body and an impeller cover, one side of the impeller body is provided with a first annular groove and a plurality of second annular grooves, the rotor structure also comprises a first permanent magnet assembly and a second permanent magnet assembly, the first permanent magnet assembly comprises a plurality of first permanent magnets, the first permanent magnets are sequentially and axially attached to each other and arranged in the first grooves, the second permanent magnet assembly comprises a plurality of second permanent magnets, the second permanent magnets are uniformly distributed along the circumferential direction of the impeller body, the impeller cover is arranged on one side of the impeller body provided with the first grooves and the second grooves, and the impeller cover respectively seals the first permanent magnet assembly and the second permanent magnet assembly in the first grooves and the second grooves. The rotor structure of this scheme can with two magnetism drive arrangement and jackshaft interact, realizes rotor at axial and radial direction's stable suspension, can realize the rotatory effect of rotor simultaneously.
Description
Technical Field
The invention relates to the technical field of heart auxiliary devices, in particular to a rotor structure of an artificial blood pump.
Background
Heart failure (heart failure) refers to heart failure, which is a symptom of heart circulatory disturbance, such as pulmonary congestion and vena cava congestion, caused by failure of the systolic function and/or diastolic function of the heart to sufficiently discharge venous blood back to the heart, resulting in blood stasis in the venous system and insufficient blood perfusion in the arterial system. Heart failure is not an independent disease, but rather the final stage of heart disease progression. Most of these heart failures begin with left heart failure, i.e. first appear as pulmonary circulatory congestion. The two-year survival rate of heart failure treatment medicine is about 80%, and the five-year survival rate is only about 50%. The treatment of heart failure must seek breakthroughs to rescue a large number of frequent death populations.
Artificial hearts have been developed in recent years as a mechanical device capable of performing a pumping function instead of the heart. The artificial heart mainly comprises an artificial blood pump (blood pumping unit), a driving device, a control system and an energy source. Among them, the design of the blood pump is a key factor affecting the performance of artificial heart transfusion. The magnetic suspension blood pump is used as a third-generation artificial heart pump, and as the rotor of the magnetic suspension pump is not contacted with the periphery, the damage of bearing friction to blood can be avoided, the blood compatibility is good, the volume is small, and the magnetic suspension blood pump can be implanted into the thoracic cavity and is the blood pump with the best performance at present.
In order to achieve the effects of rotor rotation and suspension, the magnetic suspension blood pump in the prior art is often provided with a suspension coil for achieving a suspension function and a rotation coil for achieving a rotation effect, so that the magnetic suspension blood pump in the prior art is often large in size and poor in rotor stability.
In order to solve the above technical problems, the inventor has found a magnetic suspension axial end double-motor blood pump, the blood pump has two magnetic driving devices and a rotor, the rotor surrounds outside the intermediate shaft, the two magnetic driving devices are respectively arranged at two axial sides of the rotor, the two magnetic driving devices can respectively generate electromagnetic force to the rotor, meanwhile, the magnetic driving devices can simultaneously realize the effect of rotating and axially suspending the rotor by only relying on one stator coil, when realizing the radial suspending effect of the rotor, the structural form of arranging a permanent magnet assembly in the intermediate shaft is adopted, and the radial suspending of the rotor is realized by utilizing the acting force between the permanent magnet assembly in the intermediate shaft and the rotor, so the magnetic suspension axial end double-motor blood pump invented by the inventor can greatly reduce the volume of the whole blood pump, simultaneously the two magnetic driving devices simultaneously act on the rotor, and greatly improve the stability of the rotor, but the rotor structure is designed to interact with the two magnetic driving devices and the intermediate shaft so as to realize the rotor suspending and rotating effects.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to solve the technical problems that: how to provide a rotor structure of an artificial blood pump which can interact with two magnetic driving devices and an intermediate shaft so as to realize rotor suspension and rotation effects.
In order to solve the technical problems, the invention adopts the following technical scheme:
The rotor structure of the artificial blood pump comprises an impeller, wherein the impeller comprises an impeller body and an impeller cover, one side of the impeller body is provided with a first annular groove and a plurality of second annular grooves, the second annular grooves are uniformly distributed along the circumferential direction of the impeller body, the rotor structure further comprises a first permanent magnet assembly and a second permanent magnet assembly, the first permanent magnet assembly comprises a plurality of first permanent magnets, the first permanent magnets are sequentially and axially attached to each other and are arranged in the first annular grooves, the second permanent magnet assembly comprises a plurality of second permanent magnets, the second permanent magnets are uniformly distributed along the circumferential direction of the impeller body, the second permanent magnets correspond to the second annular grooves one by one and are arranged in the second annular grooves, the impeller cover is arranged on one side of the impeller body provided with the first annular grooves and the second annular grooves, and the impeller cover respectively encapsulates the first permanent magnet assembly and the second permanent magnet assembly into the first annular grooves and the second annular grooves.
In this scheme, take the direction that rotor axis of rotation is located as axial, the direction that is perpendicular to the rotor axis is radial.
The working principle of the invention is as follows: when the rotor structure is applied to a blood pump, the rotor surrounds the intermediate shaft, and magnetic driving devices are arranged on two sides of the axial direction of the rotor, wherein the polarity of a first permanent magnet component in a first groove of the rotor needs to be in a mutually exclusive state with the permanent magnet component in the intermediate shaft in a way of being opposite to like magnetic poles, and meanwhile, the repulsive force between the first permanent magnet component in the first groove of the rotor and the permanent magnet component in the intermediate shaft needs to be far greater than the gravity of the rotor during selection, so that the gravity of the rotor can be ignored, and at the moment, the repulsive force between the first permanent magnet component in the first groove of the rotor and the permanent magnet component in the intermediate shaft can be used for enabling the rotor to be in a static state in the radial direction, and a radial clearance is formed between the intermediate shaft and the rotor, so that the radial suspension effect of the rotor is realized. Meanwhile, the permanent magnet assembly of the intermediate shaft is similar to the inner ring part of a traditional motor bearing, and the first permanent magnet assembly is similar to the outer ring part of the bearing, so that the inner ring part and the outer ring part of the bearing are completely separated, and the rotor can achieve higher rotating speed.
When the axial suspension and rotation effects of the rotor are achieved, the magnetic driving devices on two sides of the axial direction of the rotor respectively generate electromagnetic force to the second permanent magnet assembly in the rotor, meanwhile, a certain included angle is formed between the electromagnetic force direction generated by the magnetic driving devices on the second permanent magnet assembly in the rotor and the rotation direction of the rotor, and the included angle is larger than 0 degrees, so that the electromagnetic force of the magnetic driving devices on the rotor can be decomposed into acting force along the tangential direction of the rotation of the rotor and acting force along the axial direction of the rotor, at the moment, the acting force of the electromagnetic force of the two magnetic driving devices along the tangential direction of the rotation of the rotor jointly pushes the rotor to rotate, meanwhile, the acting force of the electromagnetic force of the two magnetic driving devices along the axial direction simultaneously achieves the effect of pushing the rotor to the middle or pulling the two sides, the two forces along the axial direction are designed to be identical, and the rotor is axially suspended at a stable position under the action of the two axial forces.
In summary, the rotor structure of this scheme can with two magnetism drive arrangement and jackshaft interact, realizes rotor at axial and radial direction's stable suspension, can realize the rotatory effect of rotor simultaneously. Meanwhile, the blood pump formed by the rotor structure and the two magnetic driving devices can realize the effects of suspension and rotation by only relying on one stator coil in the magnetic driving device, thereby realizing the purpose of reducing the blood pump volume and the use cost. Meanwhile, the rotor of the invention adopts the structural mode of two magnetic driving devices in the axial direction, so that the two magnetic driving devices apply acting force to the rotor at the same time, thereby ensuring that the stability of rotation of the rotor is better when the rotor is suspended.
Preferably, the impeller body comprises an impeller main body and a plurality of blades uniformly distributed along the circumference of the impeller main body, the blades are of an arc-shaped structure, each blade is provided with a second groove, two adjacent blades and the impeller main body form a liquid flow channel, and an included angle between the bottom surface of the liquid flow channel and the horizontal plane is a repose angle of the bottom surface of the liquid flow channel.
Thus, when the blood flows to the rotor and the rotor rotates, the blood is mainly dispersed from the liquid flow channel between the two blades, and because the included angle between the bottom surface of the liquid flow channel and the horizontal plane is the angle of repose (the angle of repose, also called the angle of repose, is the minimum angle formed by the inclined plane and the horizontal surface when the object placed on the inclined plane is in a critical state of sliding down along the inclined plane), when the blood flows on the liquid flow channel, the blood flows very smoothly from the liquid flow channel, the blood cannot collide with the liquid flow channel strongly, cells in the blood cannot be damaged greatly, and finally the blood flows very smoothly from the liquid flow channel, so that the blood flowing from the blood pump finally is very stable, the damage of the rotation of the rotor to the cells in the blood is reduced, and the requirement of a human body on the blood pump is better adapted.
Preferably, the end surface of the blade facing away from the impeller cover is gradually inclined outwards along the outer side surface direction, and the inclination angle is 1.5-3.5.
Therefore, the blades gradually incline outwards along the direction of the outer side surface of the end surface of the impeller cover, so that when the blades rotate in blood, the blades can generate gyroscopic effect, and the blades have inertia for keeping the rotation direction of the blades, so that once the blades rotate, the magnetic driving device can keep continuous rotation of the rotor only by providing small electromagnetic force for the rotor due to gyroscopic effect generated by the blades, on one hand, the energy consumed for keeping the rotor rotating can be reduced, and on the other hand, the heat generation of the magnetic driving device can be reduced, thereby greatly reducing the energy consumption and the heat generation phenomenon in the use process of the blood pump, and better meeting the performance requirements of human bodies on the blood pump.
Preferably, the impeller cover is provided with liquid flow grooves corresponding to the liquid flow channels, the inner end surface of the impeller cover is respectively propped against the first permanent magnet component and the second permanent magnet component, the outer end surface of the impeller cover gradually inclines outwards along the outer side surface direction, and the outer end surface of the impeller cover and the corresponding end surface of the impeller body are in smooth transition.
Therefore, the liquid flow groove on the impeller is suitable for the liquid flow channel, the stable flowing effect of blood is ensured, the outer end face of the impeller cover is also inclined outwards along the direction of the outer side face of the impeller cover, and the inclined angle on the impeller cover can be matched with the inclined angle on the impeller body to better realize the gyroscopic effect.
Preferably, the outer end face of the impeller cover is inclined outwards along the outer side face direction by an angle of 1.5-3.5 degrees.
In this way, the gyroscopic effect can be better achieved by the angle of inclination on the impeller cover.
Preferably, one end of the blade facing away from the impeller cover protrudes from the impeller body, and one end of the blade facing toward the impeller cover is flush with the end surface of the impeller body.
Thus, when blood flows into the blades, the blades protrude from the impeller body to substantially concentrate the blood at the blades, and flow out of the respective flow channels along with the rotation of the blades, thereby ensuring the blood delivery effect.
Preferably, the connection part of the impeller main body and the blades is provided with circular arc-shaped chamfers, and the periphery of the impeller main body and the blades is provided with circular arc-shaped chamfers.
In this way, the rounded chamfer reduces the effect on blood flow.
Preferably, a first step part, a second step part and a third step part are sequentially arranged on one side of the impeller body, which faces the impeller cover, outwards in the radial direction, a first groove is formed between the first step part and the second step part, a second groove is formed between the second step part and the third step part, the end face of the first step part, which faces the impeller cover, is flush with the end face of the second step part, which faces the impeller cover, and the end face of the second step part, which faces the impeller cover, is lower than the end face of the third step part, which faces the impeller cover.
Preferably, the impeller cover comprises a first cover body corresponding to the first groove position and a second cover body corresponding to the second groove position, wherein the first cover body protrudes outwards towards one end of the first permanent magnet assembly and stretches into the first groove to be propped against the first permanent magnet assembly, and the second cover body protrudes towards one end of the second permanent magnet assembly to be propped against the second permanent magnet assembly.
Preferably, the impeller body and the impeller cover are both made of titanium alloy.
Thus, since the impeller body and the impeller cover are in direct contact with blood of a human body, titanium alloy is used.
Drawings
FIG. 1 is a schematic diagram of a rotor structure of an artificial blood pump according to the present invention;
FIG. 2 is a schematic view of the other side of the rotor structure of the artificial blood pump of the present invention;
FIG. 3 is a cross-sectional view of a rotor structure of the artificial blood pump of the present invention;
FIG. 4 is a schematic view of the structure of the rotor structure of the artificial blood pump according to the present invention with the impeller cover removed;
FIG. 5 is a schematic view of the structure of the impeller body in the rotor structure of the artificial blood pump of the present invention;
Fig. 6 is a schematic diagram of the rotor structure of the artificial blood pump of the present invention, when used in combination with a magnetic drive device and an intermediate shaft.
Reference numerals illustrate: the impeller body 1, the first step 101, the second step 102, the third step 103, the first groove 104, the second groove 105, the impeller cover 2, the vane 3, the impeller body 4, the flow channel 5, the first permanent magnet assembly 6, the second permanent magnet assembly 7, the magnetic drive device 8, and the intermediate shaft 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
As shown in fig. 1 to 5, a rotor structure of an artificial blood pump comprises an impeller, the impeller comprises an impeller body 1 and an impeller cover 2, a first annular groove 104 and a plurality of second annular grooves 105 are formed in one side of the impeller body 1, the plurality of second annular grooves 105 are uniformly distributed along the circumferential direction of the impeller body 1, the rotor structure further comprises a first permanent magnet assembly 6 and a second permanent magnet assembly 7, the first permanent magnet assembly 6 comprises a plurality of first permanent magnets, the plurality of first permanent magnets are sequentially and axially attached to each other and are arranged in the first annular grooves 104, the second permanent magnet assembly 7 comprises a plurality of second permanent magnets, the plurality of second permanent magnets are uniformly distributed along the circumferential direction of the impeller body 1, the second permanent magnets are in one-to-one correspondence with the second annular grooves 105 and are arranged in the second annular grooves 105, the impeller cover 2 is arranged on one side of the impeller body 1, on which the first annular grooves 104 and the second annular grooves 105 are formed, and the impeller cover 2 is used for respectively sealing the first permanent magnet assembly 6 and the second permanent magnet assembly 7 in the first annular grooves 104 and the second annular grooves 105.
In this scheme, take the direction that rotor axis of rotation is located as axial, the direction that is perpendicular to the rotor axis is radial.
The working principle of the invention is as follows: when the rotor structure is applied to a blood pump, the rotor surrounds the intermediate shaft 9, and magnetic driving devices 8 (shown in fig. 6) are arranged on two axial sides of the rotor, wherein the polarity of the first permanent magnet component 6 in the first rotor groove 104 needs to be in a mutually repulsive state relative to the permanent magnet component in the intermediate shaft 9 in the same magnetic pole, and the repulsive force between the first permanent magnet component 6 in the first rotor groove 104 and the permanent magnet component in the intermediate shaft 9 needs to be far greater than the gravity of the rotor during selection, so that the gravity of the rotor can be ignored, and the repulsive force between the first permanent magnet component 6 in the first rotor groove 104 and the permanent magnet component in the intermediate shaft 9 can be utilized to enable the rotor to be in a static state in the radial direction, and the repulsive force also enables a radial clearance to be formed between the intermediate shaft 9 and the rotor, thereby realizing the radial suspension effect of the rotor. Meanwhile, the permanent magnet assembly of the intermediate shaft 9 is similar to the inner ring part of the conventional motor bearing, and the first permanent magnet assembly 6 is similar to the outer ring part of the bearing, so that the inner ring part and the outer ring part of the bearing are completely separated, and the rotor can reach higher rotating speed.
When the axial suspension and rotation effects of the rotor are achieved, the magnetic driving devices 8 on two sides of the axial direction of the rotor respectively generate electromagnetic force to the second permanent magnet assembly 7 in the rotor, meanwhile, a certain included angle is formed between the electromagnetic force direction generated by the magnetic driving devices 8 on the second permanent magnet assembly 7 in the rotor and the rotation direction of the rotor, and the included angle is larger than 0 degrees, so that the electromagnetic force of the magnetic driving devices 8 on the rotor can be decomposed into acting force along the tangential direction of the rotor rotation and acting force along the axial direction of the rotor, at the moment, the acting force of the electromagnetic force of the two magnetic driving devices 8 along the tangential direction of the rotor jointly pushes the rotor to rotate, meanwhile, the acting force of the electromagnetic force of the two magnetic driving devices 8 along the axial direction simultaneously achieves the effect of pushing the rotor to the middle or pulling the two sides, and the two forces along the axial direction are designed to be identical, so that the rotor is axially suspended at a stable position under the action of the two axial forces.
In summary, the rotor structure of this scheme can interact with two magnetic drive 8 and jackshaft 9, realizes the stable suspension of rotor in axial and radial direction, can realize the rotatory effect of rotor simultaneously. Meanwhile, the blood pump formed by the rotor structure and the two magnetic driving devices 8 can realize the effects of suspension and rotation by only relying on one stator coil in the magnetic driving device 8, thereby realizing the purpose of reducing the blood pump volume and the use cost. Meanwhile, the rotor of the invention adopts the structural mode of two magnetic driving devices 8 in the axial direction, so that the two magnetic driving devices 8 apply acting force to the rotor at the same time, thereby ensuring that the rotation stability of the rotor is better when the rotor is suspended.
In this embodiment, the impeller body 1 includes an impeller main body 4 and a plurality of blades 3 uniformly distributed along the circumference of the impeller main body 4, the blades 3 are in an arc structure, each blade 3 is provided with a second groove 105, a liquid flow channel 5 is formed between two adjacent blades 3 and the impeller main body 4, and an included angle between the bottom surface of the liquid flow channel 5 and a horizontal plane is a repose angle of the bottom surface of the liquid flow channel 5.
Thus, when the blood flows to the rotor and the rotor rotates, the blood is mainly dispersed from the liquid flow channel 5 between the two blades 3, and because the included angle between the bottom surface of the liquid flow channel 5 and the horizontal plane is the angle of repose of the bottom surface of the liquid flow channel 5 (the angle of repose is also the minimum angle formed by the inclined plane and the horizontal surface when an object placed on the inclined plane is in a critical state of sliding down along the inclined plane), when the blood flows on the liquid flow channel 5, the blood flows from the liquid flow channel 5 very smoothly, the blood does not collide with the liquid flow channel 5 strongly, the cells in the blood are not damaged greatly, and finally the blood flows from the liquid flow channel 5 very smoothly, so that the blood flowing from the blood pump is very stable, the damage of the rotation of the rotor to the cells in the blood is reduced, and the requirement of a human body on the blood pump is better adapted.
In the present embodiment, the bottom surface of the flow channel 5 is curved in the rotation direction of the impeller.
Thus, the bottom surface of the liquid flow channel 5 is bent along the rotation direction of the impeller, and the drainage effect on blood can be better realized.
In this embodiment, both side surfaces of the flow channel 5 are curved in the rotation direction of the impeller.
Thus, both side surfaces of the flow channel 5 are also curved in the rotation direction of the impeller, and the drainage effect on blood can be further achieved by the both side surfaces of the flow channel 5.
In this embodiment, the end face of the blade 3 facing away from the impeller cover 2 is inclined gradually outwards in the direction of its outer side, and the angle of inclination is 1.5-3.5, Ɵ in fig. 3.
In this way, the end face of the blade 3, which is away from the impeller cover 2, gradually inclines outwards along the outer side face direction, so that when the blade 3 rotates in blood, the blade 3 can generate gyroscopic effect, and therefore the blade 3 has inertia for keeping the rotation direction, once the blade 3 rotates, the magnetic driving device 8 can maintain continuous rotation of the rotor only by providing small electromagnetic force for the rotor due to gyroscopic effect generated by the blade, on one hand, the energy consumed for maintaining the rotation of the rotor can be reduced, on the other hand, the heat generation of the magnetic driving device 8 can be reduced, and the energy consumption and the heat generation phenomenon in the use process of the blood pump can be greatly reduced, so that the performance requirement of a human body on the blood pump can be better met.
In this embodiment, the end face of the blade 3 facing away from the impeller cover 2 is inclined outwardly in the direction of its outer side face by an angle of 2 °.
In this embodiment, the positions on the impeller cover 2 corresponding to the liquid flow channels 5 are all provided with liquid flow grooves corresponding to the liquid flow channels 5, the inner end surfaces of the impeller cover 2 are respectively abutted against the first permanent magnet assembly 6 and the second permanent magnet assembly 7, the outer end surfaces of the impeller cover 2 are gradually inclined outwards along the outer side surface direction, and the outer end surfaces of the impeller cover 2 and the corresponding end surfaces of the impeller body 1 are in smooth transition.
Therefore, the liquid flow groove on the impeller is adapted to the liquid flow channel 5, the stable flowing effect of blood is ensured, the outer end face of the impeller cover 2 is also inclined outwards along the outer side face direction, and the inclined angle on the impeller cover 2 can be matched with the inclined angle on the impeller body 1 to better realize the gyroscopic effect.
In this embodiment, the outer end surface of the impeller cover 2 is inclined outwardly in the direction of its outer side surface by an angle of 1.5 ° -3.5 °, which is Ɵ ° in fig. 3.
In this way, the gyroscopic effect can be better achieved by this inclination angle on the pulley cover 2.
In this embodiment, the outer end face of the impeller cover 2 is inclined outwardly in the direction of the outer side face thereof by an angle of 2 °.
In this embodiment, the end of the vane 3 facing away from the impeller cover 2 protrudes from the impeller body 4, and the end of the vane 3 facing toward the impeller cover 2 is flush with the end face of the impeller body 4.
Thus, when blood flows into the blades 3, the blades 3 protrude from the impeller main body 4 to concentrate the blood at the blades 3 substantially, and flow out from the respective flow passages 5 with the rotation of the blades 3, thereby securing the effect of transporting the blood.
In the embodiment, circular arc-shaped chamfers are arranged at the joint of the impeller main body 4 and the blades 3, and circular arc-shaped chamfers are arranged at the periphery of the impeller main body 4 and the blades 3.
In this way, the rounded chamfer reduces the effect on blood flow.
In the present embodiment, a first step 101, a second step 102 and a third step 103 are sequentially provided outwardly in the radial direction on one side of the impeller body 1 facing the impeller cover 2, a first groove 104 is formed between the first step 101 and the second step 102, a second groove 105 is formed between the second step 102 and the third step 103, and the end face of the first step 101 facing the impeller cover 2 and the end face of the second step 102 facing the impeller cover 2 are flush, and the end face of the second step 102 facing the impeller cover 2 is lower than the end face of the third step 103 facing the impeller cover 2.
In this embodiment, the impeller cover 2 includes a first cover portion corresponding to the position of the first groove 104, and a second cover portion corresponding to the position of the second groove 105, where the first cover portion protrudes outwards towards one end of the first permanent magnet assembly 6 and extends into the first groove 104 to abut against the first permanent magnet assembly 6, and the second cover portion abuts against the second permanent magnet assembly 7 towards one end of the second permanent magnet assembly 7.
In this embodiment, the impeller body 1 and the impeller cover 2 are both made of titanium alloy.
Thus, since the impeller body 1 and the impeller cover 2 are in direct contact with blood of a human body, titanium alloy is used.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the present invention, and all such modifications and equivalents are included in the scope of the claims.
Claims (9)
1. The rotor structure of the artificial blood pump is characterized by comprising an impeller, wherein the impeller comprises an impeller body and an impeller cover, one side of the impeller body is provided with a first annular groove and a plurality of second annular grooves, the plurality of second annular grooves are uniformly distributed along the circumferential direction of the impeller body, the rotor structure further comprises a first permanent magnet assembly and a second permanent magnet assembly, the first permanent magnet assembly comprises a plurality of first permanent magnets, the plurality of first permanent magnets are sequentially and axially attached to the first annular grooves, the second permanent magnet assembly comprises a plurality of second permanent magnets, the plurality of second permanent magnets are uniformly distributed along the circumferential direction of the impeller body, the second permanent magnets are in one-to-one correspondence with the second annular grooves and are arranged in the second annular grooves, the impeller cover is arranged on one side of the impeller body provided with the first annular grooves and the second annular grooves, and the impeller cover respectively encapsulates the first permanent magnet assembly and the second permanent magnet assembly into the first annular grooves and the second annular grooves;
The impeller body comprises an impeller main body and a plurality of blades uniformly distributed along the circumference of the impeller main body, wherein the blades are of an arc-shaped structure, each blade is provided with a second groove, a liquid flow channel is formed between two adjacent blades and the impeller main body, and an included angle between the bottom surface of the liquid flow channel and the horizontal plane is the repose angle of the bottom surface of the liquid flow channel.
2. The rotor structure of an artificial blood pump according to claim 1, wherein the end surface of the vane facing away from the impeller cover is gradually inclined outwardly in the direction of the outer side surface thereof, and the inclination angle is 1.5 ° -3.5 °.
3. The rotor structure of an artificial blood pump according to claim 1, wherein the impeller cover is provided with fluid grooves corresponding to the fluid channels at positions corresponding to the fluid channels, the inner end surfaces of the impeller cover are respectively abutted against the first permanent magnet assembly and the second permanent magnet assembly, the outer end surfaces of the impeller cover are gradually inclined outwards along the outer side surface direction, and the outer end surfaces of the impeller cover are in smooth transition with the corresponding end surfaces of the impeller body.
4. A rotor structure of an artificial blood pump according to claim 3, wherein the outer end surface of the impeller cover is inclined outwardly in the direction of the outer side surface thereof by an angle of 1.5 ° to 3.5 °.
5. The rotor structure of an artificial blood pump according to claim 1, wherein an end of the vane facing away from the impeller cover protrudes from the impeller main body, and an end of the vane facing toward the impeller cover is flush with an end surface of the impeller main body.
6. The rotor structure of an artificial blood pump according to claim 1, wherein circular arc-shaped chamfers are arranged at the joints of the impeller main body and the blades, and circular arc-shaped chamfers are arranged at the peripheries of the impeller main body and the blades.
7. The rotor structure of an artificial blood pump according to claim 1, wherein a first step portion, a second step portion, and a third step portion are sequentially provided outward in a radial direction on a side of the impeller body facing the impeller cover, a first groove is formed between the first step portion and the second step portion, a second groove is formed between the second step portion and the third step portion, and an end face of the first step portion facing the impeller cover and an end face of the second step portion facing the impeller cover are flush, and an end face of the second step portion facing the impeller cover is lower than an end face of the third step portion facing the impeller cover.
8. The rotor structure of an artificial blood pump according to claim 1, wherein the impeller cover includes a first cover portion corresponding to the first groove position and a second cover portion corresponding to the second groove position, the first cover portion protruding outward toward one end of the first permanent magnet assembly and extending into the first groove to abut against the first permanent magnet assembly, and the second cover portion abutting against the second permanent magnet assembly toward one end of the second permanent magnet assembly.
9. The rotor structure of the artificial blood pump according to claim 1, wherein the impeller body and the impeller cover are both made of titanium alloy.
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| CN101371041A (en) * | 2006-01-13 | 2009-02-18 | 哈特威尔公司 | rotary blood pump |
| CN101732769A (en) * | 2010-01-26 | 2010-06-16 | 浙江大学 | Implantable blood pump adopting driven suspension bearing |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4321260C1 (en) * | 1993-06-25 | 1995-03-09 | Westphal Dieter Dipl Ing Dipl | Blood pump as a centrifugal pump |
| US9095428B2 (en) * | 2012-06-08 | 2015-08-04 | Cameron International Corporation | Artificial heart system |
| CN103566419A (en) * | 2012-08-09 | 2014-02-12 | 北京精密机电控制设备研究所 | Magnetic liquid suspension centrifugal vane wheel |
| WO2016187057A1 (en) * | 2015-05-15 | 2016-11-24 | Thoratec Corporation | Improved axial flow blood pump |
| PL3173108T3 (en) * | 2015-11-30 | 2018-12-31 | Fundacja Rozwoju Kardiochirurgii Im. Prof. Zbigniewa Religi | Impeller with closed channels for a centrifugal implantable ventricular assist pump |
| CN105833368A (en) * | 2016-05-11 | 2016-08-10 | 北京精密机电控制设备研究所 | Centrifugal impeller for blood pump |
| EP3300750A1 (en) * | 2016-09-29 | 2018-04-04 | Berlin Heart GmbH | Blood pump |
| CN110496258A (en) * | 2018-05-18 | 2019-11-26 | 江苏心佑医疗器械有限公司 | Forth generation artificial heart Permanent-magnet bearing rotary pump |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101371041A (en) * | 2006-01-13 | 2009-02-18 | 哈特威尔公司 | rotary blood pump |
| CN101732769A (en) * | 2010-01-26 | 2010-06-16 | 浙江大学 | Implantable blood pump adopting driven suspension bearing |
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