CN111375098A - Percutaneous blood pump and rotor limit structure thereof - Google Patents
Percutaneous blood pump and rotor limit structure thereof Download PDFInfo
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- CN111375098A CN111375098A CN201811643091.5A CN201811643091A CN111375098A CN 111375098 A CN111375098 A CN 111375098A CN 201811643091 A CN201811643091 A CN 201811643091A CN 111375098 A CN111375098 A CN 111375098A
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- magnetic
- impeller
- magnetic member
- rotor
- motor
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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
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
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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
Abstract
The invention relates to a percutaneous blood pump and a rotor limit structure thereof. The rotor limit structure comprises a fixed wing, an impeller, a first magnetic part and a second magnetic part. Wherein the first magnetic member is disposed on the fixed wing. The second magnetic part is arranged on the impeller. And the first magnetic part and the second magnetic part are arranged in a repelling way. Above-mentioned percutaneous blood pump and rotor limit structure thereof provides axial supporting power for the electric motor rotor of percutaneous blood pump through two magnetic part that repel each other to electric motor rotor and impeller sweep the thorax risk have been reduced.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a percutaneous blood pump and a rotor limiting structure thereof.
Background
Cardiovascular diseases have become a significant cause of human death, and heart transplantation is an effective means for treating patients with critical heart diseases. In reality, however, there are far more heart recipients than heart donors, resulting in death of the patient while awaiting the heart transplant. The percutaneous blood pump can assist the heart to pump blood, and is a common device for assisting in treating cardiovascular diseases.
In the working process of the percutaneous blood pump, the impeller and the rotor of the percutaneous blood pump easily move axially under the action of blood, so that the rotor is contacted with the end cover, and further the chamber sweeping occurs. In general, in order to prevent the rotor and the end cover from being swept, a hydrodynamic bearing structure is provided on the surface of the end cover, so that the cleaning fluid forms an oil film on the surface of the end cover to serve as an axial hydrodynamic bearing. However, the stability of the axial hydrodynamic bearing depends on the stability of the filling pressure of the cleaning fluid, and in actual use, the delivery pressure of the cleaning fluid fluctuates under certain abnormal conditions, the fluctuating pressure causes unstable flow rate flowing through the narrow flow passage of the axial hydrodynamic bearing, and the hydraulic pressure is sensitive to the pressure, the flow rate and the width of the flow passage, thereby seriously affecting the stability of the axial hydrodynamic bearing. The rotor vibration is caused if the rotor vibration is small, the blood pumping performance is damaged, and the axial hydraulic bearing can not effectively form oil film support if the rotor vibration is serious, so that the rotor unstability sweeps the chamber, and the machine is damaged and people die.
Disclosure of Invention
In view of the above, it is necessary to provide a percutaneous blood pump and a rotor limit structure thereof
A rotor limiting structure for a percutaneous blood pump, the rotor limiting structure comprising:
a fixed wing;
the impeller is arranged at a distance from the fixed wing;
the first magnetic piece is arranged on the fixed wing;
and the second magnetic part is arranged on the impeller and is arranged in a manner of repelling with the first magnetic part.
Above-mentioned rotor limit structure is through setting up repellent magnetism spare on impeller and stationary vane, and two repellent magnetism spares can provide the axial bracing power for percutaneous blood pump's electric motor rotor to prevented that electric motor rotor from along the axial toward the front end skew under the drive of blood flow, reduced electric motor rotor and impeller and swept the thorax risk. And the produced magnetic force of the magnetic part that repels does not receive factors such as cleaning solution velocity of flow, pressure influence, compares in traditional axial hydraulic bearing, and the rotor limit structure of this application has reduced the reliance to cleaning solution fluid performance, has reduced the filling control degree of difficulty of cleaning solution, has improved the spacing stability of rotor.
In one embodiment, the first magnetic element seal is disposed inside the stationary vane and/or the second magnetic element seal is disposed inside the impeller.
In one embodiment, the rotor limiting structure further comprises a first back plate made of a magnetic conductive alloy, and/or a second back plate made of a magnetic conductive alloy; the first magnetic part is fixed on the fixed wing through the first back plate, and/or the second magnetic part is fixed on the impeller through the second back plate.
In one embodiment, the first back plate is fixed on the outer surface of the rear end of the fixed wing, and the first magnetic piece is fixed on the outer surface of the first back plate; and/or the second back plate is fixed on the outer surface of the front end of the impeller, and the second magnetic piece is fixed on the outer surface of the second back plate.
In one embodiment, the first magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets distributed along the circumferential direction, and/or the second magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets distributed along the circumferential direction.
In one embodiment, a radial distance from a central axis of the impeller to an outer circumferential surface of the second magnetic member is not equal to a radial distance from a central axis of the stationary vane to an outer circumferential surface of the first magnetic member.
In one embodiment, the rotor limiting structure further includes:
the first motor end cover is arranged on one side, far away from the fixed wing, of the impeller;
a third magnetic member disposed on the first motor end cover;
and the fourth magnetic part is arranged on the impeller, and the fourth magnetic part and the third magnetic part are arranged in a repulsive manner.
In one embodiment, the third magnetic member is disposed inside the first motor end cover, and/or the fourth magnetic member is disposed inside the impeller in a sealing manner.
In one embodiment, the rotor limiting structure further comprises a third back plate made of a magnetic conductive alloy, and/or a fourth back plate made of a magnetic conductive alloy; the third magnetic part is fixed on the first motor end cover through the third back plate, and/or the fourth magnetic part is fixed on the impeller through the fourth back plate.
In one embodiment, the third back plate is fixed on the outer surface of the front end of the first motor end cover, and the third magnetic piece is fixed on the outer surface of the third back plate; and/or the fourth back plate is fixed on the outer surface of the rear end of the impeller, and the fourth magnetic part is fixed on the outer surface of the fourth back plate.
In one embodiment, the third magnetic member is a magnetic ring or a plurality of independent magnets uniformly distributed along the circumferential direction of the first motor end cover, and/or the fourth magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets uniformly distributed along the circumferential direction of the impeller.
In one embodiment, a radial distance from a central axis of the first motor end cover to an outer circumferential surface of the third magnetic member is not equal to a radial distance from a central axis of the impeller to an outer circumferential surface of the fourth magnetic member.
In one embodiment, the fourth magnetic member is a magnetic block, the impeller is provided with a mounting hole matched with the motor rotating shaft, and the fourth magnetic member is sealed in the mounting hole by the motor rotating shaft.
The invention also provides a percutaneous blood pump which comprises a motor rotor, a motor rotating shaft and any one of the rotor limiting structures, wherein the motor rotor is fixed on the motor rotating shaft, and one end of the motor rotating shaft penetrates through the first motor end cover to be connected with the impeller.
In one embodiment, the percutaneous blood pump further comprises a second motor end cover, the other end of the motor rotating shaft is connected with the second motor end cover, a third hydrodynamic bearing is formed on the surface, close to the motor rotor, of the first motor end cover, and a fourth hydrodynamic bearing is formed on the surface, close to the motor rotor, of the second motor end cover.
Above-mentioned percutaneous blood pump is through adopting foretell rotor limit structure to restrict the axial motion of impeller in certain extent, reduced rotor and impeller and swept the thorax risk.
Drawings
FIG. 1 is a cross-sectional view of a percutaneous blood pump in accordance with one embodiment;
FIG. 2 is a schematic view of a rotor limiting structure of the percutaneous blood pump shown in FIG. 1;
FIG. 3 is a schematic view of a rotor limiting structure according to an embodiment;
FIG. 4 is a schematic view of a rotor limiting structure according to another embodiment;
FIG. 5 is a schematic view of a rotor limiting structure according to yet another embodiment;
FIG. 6 is a schematic view of a rotor limiting structure according to yet another embodiment;
FIG. 7 is a schematic view of a rotor limiting structure according to yet another embodiment;
fig. 8 is a diameter comparison of two opposing magnetic members according to an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, the present embodiment provides a rotor stop 100 for a percutaneous blood pump 10, such as a rotor stop 100 for a percutaneous trans-valvular blood pump. The percutaneous blood pump 10 includes a first motor end cap 111, an impeller 120, a stationary vane 130, a second motor end cap 112, a motor shaft 140, and a motor rotor 150. The first motor end cover 111, the impeller 120 and the fixed wings 130 are sequentially arranged at intervals along the axial direction, the motor rotor 150 is fixedly arranged on the motor rotating shaft 140, one end of the motor rotating shaft 140 penetrates through the first motor end cover 111 to be fixedly connected with the impeller 120, the other end of the motor rotating shaft 140 is connected with the second motor end cover 112, the motor rotor 150 is arranged on the motor rotating shaft 140, and the fixed wings 130 are arranged at the front end of the impeller 120 and fixedly connected with the outlet and inlet pipe 160 of the percutaneous blood pump 10 to play a role in rectification.
In the present embodiment, the percutaneous blood pump 10 further includes a first magnetic member 104 and a second magnetic member 103, and the second magnetic member 103 is disposed at the front end of the impeller 120, i.e. the end near the fixed wing 130. The first magnetic member 104 is disposed at a rear end of the stationary wing 130, i.e., an end near the impeller 120. The second magnetic member 103 and the first magnetic member 104 are disposed in a manner of repelling each other, that is, one end of the second magnetic member 103 having the same polarity as that of the first magnetic member 104 is disposed opposite to each other. For example, the N-pole of the second magnetic member 103 is opposite to the N-pole of the first magnetic member 104, or the S-pole of the second magnetic member 103 is opposite to the S-pole of the first magnetic member 104.
The impeller 120, the fixed wing 130, the second magnetic member 103 and the first magnetic member 104 together realize the position limitation of the motor rotor 150, that is, the rotor position limitation structure 100 in this embodiment includes the impeller 120, the fixed wing 130, the second magnetic member 103 and the first magnetic member 104.
During the blood flow, referring to the arrow pointing from right to left in fig. 2, the impeller 120 applies a right-to-left suction to the blood, so that the blood flows from right to left. Meanwhile, blood can provide a counter force from left to right for the impeller 120, the counter force drives the impeller 120 to move forwards, the motor rotating shaft 140 is connected with the impeller 120, and the motor rotor 150 is fixedly arranged on the motor rotating shaft 140, so that the motor rotor 150 also moves forwards, the motor rotor 150 collides with the first motor end cover 111, and the rotor limiting structure 100 can provide axial supporting force for the impeller 120 by arranging repulsive magnetic pieces on the impeller 120 and the fixed wings 130 to prevent the impeller 120 from moving forwards and further prevent the motor rotor 150 from moving forwards.
Further, the rotor limiting structure 100 may further include a first motor end cover 111, a third magnetic member 101, and a fourth magnetic member 102. The first motor end cover 111 is spaced apart from the impeller 120 on a side thereof away from the stationary vane 130. The third magnetic member 101 is disposed at a front end of the first motor cover 111, i.e., an end close to the impeller 120. The fourth magnetic member 102 is disposed at a rear end of the impeller 120, i.e., an end near the first motor cover 111. The third magnetic member 101 and the fourth magnetic member 102 are disposed in a manner of repelling each other, that is, one end of the third magnetic member 101 having the same polarity as that of the fourth magnetic member 102 is disposed opposite to the other end. For example, the N-pole of the third magnetic member 101 is opposite to the N-pole of the fourth magnetic member 102, or the S-pole of the third magnetic member 101 is opposite to the S-pole of the fourth magnetic member 102.
Under the condition that the two repellent magnetic members on the impeller 120 and the fixed wing 130 can provide axial supporting force for the impeller 120, in order to prevent the supporting force from being too large, so that the impeller 120 moves backwards again (i.e. moves from right to left) to cause the impeller 120 to collide with the front end of the first motor end cover 111, the two repellent magnetic members of the third magnetic member 101 and the fourth magnetic member 102 are arranged to limit the axial movement of the impeller 120 within a certain range, and the axial supporting force generated by the magnetic members of the third magnetic member 101 and the fourth magnetic member 102 is increased without being influenced by factors such as flow rate and pressure of cleaning liquid, compared with the conventional axial hydraulic bearing, the rotor limiting structure 100 of the present application reduces dependence on the fluid performance of the cleaning liquid, reduces the filling control difficulty of the cleaning liquid, improves the stability of rotor limiting, and simultaneously prevents the motor rotor 150 and the impeller 120 from moving axially, further reducing the risk of sweeping the motor rotor 150 and impeller 120.
In this embodiment, the first motor end cover 111, the impeller 120 and the fixed wing 130 are made of a biocompatible polymer material (e.g., teflon) or a titanium alloy.
Various implementations in which the first magnetic member 104, the second magnetic member 103, the third magnetic member 101, and the fourth magnetic member 102 are disposed on the stationary vane 130, the impeller 120, and the motor shaft 140 will be described below.
Example 1
In this example, the first magnetic element 104 is a magnetic block or a magnetic ring or a plurality of independent magnets distributed along the circumferential direction, the first magnetic element 104 is embedded in the fixed wing 130, the rotor limiting structure 100 further includes a first cover 1041, the first cover 1041 is disposed on the fixed wing 130 and is used for sealing and fixing the first magnetic element 104, for example, ultrasonic welding or laser welding is used for connection and sealing, and biocompatible glue may also be used for connection and sealing.
Specifically, referring to fig. 6, when the first magnetic member 104 is a magnetic ring, a first annular groove is formed on the fixing wing 130, the first magnetic member 104 is disposed in the first annular groove, and the first sealing cover 1041 is matched with the first annular groove, so as to seal the first annular groove and fix the magnetic ring. When the first magnetic member 104 is a plurality of independent magnets uniformly distributed along the circumferential direction, the fixed wing 130 has a plurality of grooves along the circumferential direction, and the plurality of independent magnets are respectively disposed in the plurality of grooves.
The number of the first caps 1041 is plural or one, and specifically, when the number of the first caps 1041 is plural, the number of the first caps 1041 is the same as the number of the recesses, and the shape of each first cap 1041 matches the shape of the corresponding recess. When there is one first cap 1041, the first cap 1041 is annular and has a plurality of radial sealing portions, the number of the sealing portions is the same as the number of the grooves, and each sealing portion is matched with the shape of the groove of the stationary wing 130. The first cap 1041 is disposed in the groove to seal and fix the individual magnet. For example, the sealing portion is formed by a plurality of spaced radial ribs and a recess between two adjacent radial ribs, when the axial length of the independent magnets is longer than that of the grooves, and because the independent magnets are respectively arranged in the grooves and a gap is reserved between every two adjacent independent magnets, the radial ribs fill the gaps between the individual magnets, the recesses are adapted to receive portions of the individual magnets that are longer than the recesses, the sealing and fixing of the independent magnets are realized under the matching of the radial ribs and the concave parts, or the sealing part is composed of a plurality of radial convex parts and slits between two adjacent convex parts, when the axial length of the independent magnets is shorter than that of the grooves, and because the independent magnets are respectively arranged in the grooves, the radial convex part can fill the part of the independent magnet, which is shorter than the groove, and the slit is used for accommodating the part, which is longer than the independent magnet, between two adjacent grooves, so that the sealing and the fixing of the independent magnet are realized under the matching of the radial convex part and the slit.
Referring to fig. 7, when the first magnetic element 104 is a rectangular or cylindrical magnetic block, the rear end of the fixed wing 130 is provided with a rectangular or circular groove. The first magnetic member 104 is disposed in the recess. The first cap 1041 is matched with the groove for sealing and fixing the first magnetic element 104.
Example 2
Referring to fig. 6, in this example, the second magnetic member 103 is a magnetic block or a magnetic ring or a plurality of independent magnets circumferentially distributed along the front end of the impeller 120, the second magnetic member 103 is embedded in the front end of the impeller 120, the rotor limiting structure 100 further includes a second cover 1031, the second cover 1031 is disposed on the front end of the impeller 120 and is used for sealing and fixing the second magnetic member 103, for example, ultrasonic welding or laser welding is used for connection and sealing, or biocompatible glue is used for connection and sealing.
Specifically, when the second magnetic member 103 is a magnetic ring, a second ring groove is formed on the front end of the impeller 120, and the second magnetic member 103 is disposed in the second ring groove. The second cover 1031 is matched with the second ring groove, so as to seal the second ring groove and fix the magnetic ring. When the second magnetic member 103 is a plurality of independent magnets uniformly distributed along the circumferential direction, a plurality of grooves are formed in the front end of the impeller 120 along the circumferential direction, and the plurality of independent magnets are respectively disposed in the plurality of grooves. The number of the second covers 1031 is plural or one, specifically, when the number of the second covers 1031 is plural, the number of the second covers 1031 is the same as the number of the grooves, and the shape of each second cover 1031 matches the shape of the corresponding groove; when the second cover 1031 is one, the second cover 1031 is ring-shaped and has a plurality of radial sealing portions, the number of the sealing portions is the same as the number of the grooves, and each sealing portion is matched with the shape of the groove at the rear end of the impeller 120. The second cover 1031 is disposed in the recess to seal and fix the individual magnet. For example, the sealing portion is formed by a plurality of spaced radial ribs and a recess between two adjacent radial ribs, when the axial length of the independent magnets is longer than that of the grooves, and because the independent magnets are respectively arranged in the grooves and a gap is reserved between every two adjacent independent magnets, the radial ribs fill the gaps between the individual magnets, the recesses are adapted to receive portions of the individual magnets that are longer than the recesses, the sealing and fixing of the independent magnets are realized under the matching of the radial ribs and the concave parts, or the sealing part is composed of a plurality of radial convex parts and slits between two adjacent convex parts, when the axial length of the independent magnets is shorter than that of the grooves, and because the independent magnets are respectively arranged in the grooves, the radial convex part can fill the part of the independent magnet, which is shorter than the groove, and the slit is used for accommodating the part, which is longer than the independent magnet, between two adjacent grooves, so that the sealing and the fixing of the independent magnet are realized under the matching of the radial convex part and the slit.
Referring to fig. 2, when the second magnetic member 103 is a rectangular or cylindrical magnetic block, a rectangular or circular groove is formed at the front end of the impeller 120. The second magnetic member 103 is disposed in the groove. The second cover 1031 is matched with the groove to seal and fix the second magnetic member 103.
Example 3
As shown in fig. 2, the third magnetic member 101 is a magnetic ring or a plurality of independent magnets uniformly distributed along the circumferential direction of the first motor end cap 111, the third magnetic member 101 is embedded in the front end of the first motor end cap 111, the rotor position limiting structure 100 further includes a third cover 1011, and the third cover 1011 is disposed on the first motor end cap 111 and is used for sealing and fixing the third magnetic member 101, for example, ultrasonic welding or laser welding is used for connection and sealing, or biocompatible glue is used for connection and sealing.
When the third magnetic member 101 is a magnetic ring, the first motor end cap 111 is provided with a third ring groove, and the third magnetic member 101 is disposed in the third ring groove. The third sealing cover 1011 is matched with the third ring groove and can seal the third ring groove to seal and fix the magnetic ring. When the third magnetic member 101 is a plurality of independent magnets uniformly distributed along the circumferential direction, a plurality of grooves are formed in the first motor end cover 111 along the circumferential direction, the plurality of independent magnets are respectively arranged in the plurality of grooves, the number of the third cover 1011 is multiple or one, specifically, when the number of the third cover 1011 is multiple, the number of the third cover 1011 is the same as the number of the grooves, and the shape of each third cover 1011 matches with the shape of the corresponding groove, when the third cover 1011 is one, the third cover 1011 is annular and has a plurality of radial sealing portions, the number of the sealing portions is the same as the number of the grooves, and each sealing portion matches with the shape of the groove of the first motor end cover 111. The third cover 1011 is disposed in the groove to seal and fix the independent magnets, for example, the sealing part is composed of a plurality of spaced radial ribs and a concave part between two adjacent radial ribs, when the axial length of the independent magnets is longer than the length of the groove, and since the plurality of independent magnets are respectively disposed in the groove and there is a gap between two adjacent independent magnets, the radial ribs can fill the gap between the independent magnets, the concave part is used to accommodate the part of the independent magnets longer than the groove, the sealing and fixing of the independent magnets are realized under the cooperation of the radial ribs and the concave part, or, the sealing part is composed of a plurality of radial protrusions and a slit between two adjacent protrusions, when the axial length of the independent magnets is shorter than the length of the groove, and since the plurality of independent magnets are respectively disposed in the groove, the radial protrusions can fill the part of the independent magnets shorter than the groove, the slit is used to accommodate the part of the adjacent two grooves longer than the independent magnets, the sealing and fixing of the independent magnet are realized under the matching of the radial convex part and the slit.
Referring to fig. 4, the third magnetic member 101 may not be embedded in the first motor cover 111. Specifically, the third magnetic member 101 is formed by processing and magnetizing a magnetic material (e.g., platinum-cobalt alloy), and the third magnetic member 101 may be a magnetic ring or a plurality of independent magnets uniformly distributed along the circumferential direction. The rotor limiting structure 100 further includes a third back plate 1012, and the third magnetic member 101 is fixed on the surface of the third back plate 1012. The third back plate 1012 is fixed to the surface of the first motor end cover 111. The third back plate 1012 is made of magnetic conductive alloy, which plays a role of electromagnetic shielding, thereby preventing the magnetic lines of force of the third magnetic member 101 from coupling with the magnetic lines of force inside the motor. The third magnetic member 101 and the third back plate 1012 are directly disposed on the surface of the first motor end cap 111, so as to avoid slotting on the first motor end cap 111, simplify the process, and reduce the cost.
Example 4
Referring to fig. 2, the fourth magnetic member 102 is a magnetic ring or a plurality of independent magnets distributed along the circumferential direction of the impeller 120, the fourth magnetic member 102 is embedded in the rear end of the impeller 120, the rotor limiting structure 100 further includes a fourth cover 1021, and the fourth cover 1021 is disposed on the impeller 120 and is used for sealing and fixing the fourth magnetic member 102, for example, ultrasonic welding or laser welding is used for connection and sealing, or biocompatible glue is used for connection and sealing.
Specifically, when the fourth magnetic member 102 is a magnetic ring, a fourth annular groove is formed in the rear end surface of the impeller 120, and the fourth magnetic member 102 is disposed in the fourth annular groove. The fourth cover 1021 is matched with the fourth ring groove, so that the fourth ring groove can be plugged to seal and fix the magnetic ring. When the fourth magnetic member 102 is a plurality of independent magnets uniformly distributed along the circumferential direction, a plurality of grooves are formed at the rear end of the impeller 120 along the circumferential direction, and the plurality of independent magnets are respectively disposed in the plurality of grooves. The number of the fourth cover 1021 is one or plural, specifically, when the number of the fourth cover 1021 is plural, the number of the fourth cover 1021 is the same as the number of the grooves, and the shape of each fourth cover 1021 matches the shape of the corresponding groove, and when the number of the fourth cover 1021 is one, the fourth cover 1021 is annular and has a plurality of radial seal portions, the number of the seal portions is the same as the number of the grooves, and each seal portion matches the shape of the groove at the front end of the impeller 120. A fourth cover 1021 is disposed within the recess to seal and secure the individual magnets. For example, the sealing portion is formed by a plurality of spaced radial ribs and a recess between two adjacent radial ribs, when the axial length of the independent magnets is longer than that of the grooves, and because the independent magnets are respectively arranged in the grooves and a gap is reserved between every two adjacent independent magnets, the radial ribs fill the gaps between the individual magnets, the recesses are adapted to receive portions of the individual magnets that are longer than the recesses, the sealing and fixing of the independent magnets are realized under the matching of the radial ribs and the concave parts, or the sealing part is composed of a plurality of radial convex parts and slits between two adjacent convex parts, when the axial length of the independent magnets is shorter than that of the grooves, and because the independent magnets are respectively arranged in the grooves, the radial convex part can fill the part of the independent magnet, which is shorter than the groove, and the slit is used for accommodating the part, which is longer than the independent magnet, between two adjacent grooves, so that the sealing and the fixing of the independent magnet are realized under the matching of the radial convex part and the slit.
Referring to fig. 3, the fourth magnetic member 102 may also be a magnetic block, and further, the magnetic block may be rectangular cylinder or cylindrical. The center of the rear end surface of the impeller 120 is provided with a mounting hole for penetrating the motor shaft 140, and the fourth magnetic member 102 is arranged in the mounting hole and sealed by the motor shaft 140. The fourth magnetic member 102 is directly disposed in the mounting hole, so that additional grooving on the end face of the impeller 120 is not required, the processing difficulty and cost are reduced, the fourth magnetic member 102 is directly sealed and fixed through the motor rotating shaft 140, a sealing cover is not required to be used for sealing, and the sealing difficulty is reduced.
In another embodiment, the fourth magnetic member 102 may be directly disposed on the rear end surface of the impeller 120 without being embedded in the impeller 120. Specifically, referring to fig. 5, the fourth magnetic member 102 is made of a magnetic material (e.g., platinum-cobalt alloy) by machining and magnetizing. The rotor spacing structure 100 further includes a fourth back plate 1022, and the fourth magnetic member 102 is fixed on a surface of the fourth back plate 1022 (e.g., by adhesion). The fourth back plate 1012 is fixed to the rear end surface of the impeller 120, that is, the end surface of the impeller 120 close to the first motor cover 111. The fourth back plate 1012 is made of a magnetic conductive alloy, and plays a role of electromagnetic shielding, thereby preventing external magnetic lines of force from being coupled with the magnetic lines of force of the fourth magnetic member 102, and further increasing the unilateral magnetic pulling force of the third magnetic member 101 and the fourth magnetic member 102. By directly arranging the fourth magnetic member 102 and the fourth back plate 1022 on the end surface of the impeller 120, grooving on the end surface of the impeller 120 is avoided, the process is simplified, and the cost is reduced.
Example 5
Further, in the embodiment shown in fig. 5, the third magnetic member 101 is an embedded magnetic block or magnetic ring or a plurality of independent magnets, and a radial distance from a central axis of the impeller 120 to an outer peripheral surface of the fourth magnetic member 102 is greater than a radial distance from a central axis of the first motor end cover 111 to an outer peripheral surface of the third magnetic member 101, so that when the impeller 120 is off-axis, the third magnetic member 101 and the fourth magnetic member 102 which repel each other can generate a radial thrust opposite to the off-axis direction on the impeller 120, and the radial thrust can make the impeller 120 return to the on-axis direction.
Referring to fig. 2 and 8, in one embodiment, a radial distance H from a central axis of the first motor cover 111 to an outer circumferential surface of the third magnetic member 101 is not equal to a radial distance H from a central axis of the impeller 120 to an outer circumferential surface of the fourth magnetic member 102. For example, as shown in fig. 8, a radial distance H from the central axis of the first motor cover 111 to the outer circumferential surface of the third magnetic member 101 is greater than a radial distance H from the central axis of the impeller 120 to the outer circumferential surface of the fourth magnetic member 102. Or in other embodiments, the radial distance H from the central axis of the first motor end cover 111 to the outer circumferential surface of the third magnetic member 101 is smaller than the radial distance H from the central axis of the impeller 120 to the outer circumferential surface of the fourth magnetic member 102.
When the third magnetic member 101 or the fourth magnetic member 102 is a plurality of independent magnets uniformly distributed in the circumferential direction, the "outer circumferential surface" herein refers to a surface of a single independent magnet away from the central axis of the first motor cover 111 or the central axis of the impeller 120.
Further, the radial distance from the central axis of the impeller 120 to the outer circumferential surface of the second magnetic member 103 is not equal to the radial distance from the central axis of the stationary blade 130 to the outer circumferential surface of the first magnetic member 104. Thus, when the impeller 120 is off-axis, the two magnetic members that repel each other can generate a radial thrust F on the impeller 120 opposite to the off-axis direction, and the radial thrust F can bring the impeller 120 back on-axis.
Although the first magnetic member 104, the second magnetic member 103, the third magnetic member 101, and the fourth magnetic member 102 are described above in some embodiments, the first magnetic member 104, the second magnetic member 103, the third magnetic member 101, and the fourth magnetic member 102 are not limited to the above-described embodiments, for example, the first magnetic member 104 and the second magnetic member 103 may be disposed on the stationary blade 130 and the impeller 120 by a magnetic conductive material, which is not limited in this respect.
Referring to fig. 1, in another aspect of the present application, there is provided a percutaneous blood pump 10, in which the percutaneous blood pump 10 includes a motor rotor 150, a motor rotating shaft 140, and the rotor limiting structure 100 of any of the embodiments described above. One end of the motor shaft 140 is connected to the motor rotor 150, and the other end of the motor shaft 140 passes through the first motor end cover 111 and is connected to the impeller 120 to drive the impeller 120 to rotate. Because the percutaneous blood pump 10 has the rotor limit structure 100 of any one of the embodiments described above. Because the rotor limit structure 100 can provide axial supporting force for the motor rotor 150 of the percutaneous blood pump 10, the axial movement of the motor rotor 150 is limited within a certain range, and the risk of sweeping the chamber of the motor rotor 150 and the impeller 120 is reduced.
Further, the percutaneous blood pump 10 further includes a second motor end cover 112, and the first motor end cover 111 and the second motor end cover 112 are respectively located at two sides of the motor rotor 150. The surface of the motor rotor 150 is formed with a pouring passage for pouring the cleaning solution. Further, the surface of the first motor cover 111 is provided with a wedge groove (not shown) or a spiral groove (not shown), so that the cleaning solution can form a third hydrodynamic bearing 181 on the surface of the first motor cover 111 close to the motor rotation shaft 140. Similarly, the surface of the second motor cover 112 is also provided with a wedge groove (not shown) or a spiral groove (not shown), so that the cleaning solution forms a fourth hydrodynamic bearing 182 on the surface of the second motor cover 112 close to the motor shaft 140.
The third hydrodynamic bearing 181 and the fourth hydrodynamic bearing 182 are used in cooperation with the rotor limiting structure 100, so that the axial supporting force of the motor rotor 150 can be further enhanced, and the risk of sweeping the chamber of the rotor and the impeller 120 is reduced. It should be noted that the percutaneous blood pump 10 may also be provided with the rotor limiting structure 100 alone without a hydrodynamic bearing, so that the parts processing of the percutaneous blood pump 10 is simplified, the manufacturing difficulty and cost are reduced, and the production efficiency is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A rotor limiting structure for a percutaneous blood pump, the rotor limiting structure comprising:
a fixed wing;
the impeller is arranged at a distance from the fixed wing;
the first magnetic piece is arranged on the fixed wing;
and the second magnetic part is arranged on the impeller and is arranged in a manner of repelling with the first magnetic part.
2. The rotor limiting structure according to claim 1, wherein the first magnetic member is disposed inside the stationary vane in a sealing manner, and/or the second magnetic member is disposed inside the impeller in a sealing manner.
3. The rotor limit structure of claim 1, further comprising a first back plate made of a magnetically conductive alloy, and/or a second back plate made of a magnetically conductive alloy; the first magnetic part is fixed on the fixed wing through the first back plate, and/or the second magnetic part is fixed on the impeller through the second back plate.
4. The rotor limiting structure according to claim 3, wherein the first back plate is fixed to an outer surface of a rear end of the fixed wing, and the first magnetic member is fixed to an outer surface of the first back plate; and/or the second back plate is fixed on the outer surface of the front end of the impeller, and the second magnetic piece is fixed on the outer surface of the second back plate.
5. The rotor limit structure of claim 1, wherein the first magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets distributed along the circumferential direction, and/or the second magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets distributed along the circumferential direction.
6. The rotor limiting structure according to any one of claims 1 to 5, wherein a radial distance from a central axis of the impeller to an outer circumferential surface of the second magnetic member is not equal to a radial distance from a central axis of the stationary vane to an outer circumferential surface of the first magnetic member.
7. The rotor limiting structure of claim 1 further comprising:
the first motor end cover is arranged on one side, far away from the fixed wing, of the impeller;
a third magnetic member disposed on the first motor end cover;
and the fourth magnetic part is arranged on the impeller, and the fourth magnetic part and the third magnetic part are arranged in a repulsive manner.
8. The rotor limiting structure according to claim 7, wherein the third magnetic member is disposed inside the first motor end cover, and/or the fourth magnetic member is disposed inside the impeller in a sealing manner.
9. The rotor limit structure of claim 7, further comprising a third back plate made of a magnetically conductive alloy, and/or a fourth back plate made of a magnetically conductive alloy; the third magnetic part is fixed on the first motor end cover through the third back plate, and/or the fourth magnetic part is fixed on the impeller through the fourth back plate.
10. The rotor limit structure of claim 9, wherein the third back plate is fixed to the outer surface of the front end of the first motor end cover, and the third magnetic member is fixed to the outer surface of the third back plate; and/or the fourth back plate is fixed on the outer surface of the rear end of the impeller, and the fourth magnetic part is fixed on the outer surface of the fourth back plate.
11. The rotor limit structure of claim 7, wherein the third magnetic member is a magnetic ring or a plurality of independent magnets evenly distributed along the circumferential direction of the first motor end cover, and/or the fourth magnetic member is a magnetic block or a magnetic ring or a plurality of independent magnets evenly distributed along the circumferential direction of the impeller.
12. The rotor limiting structure according to any one of claims 7 to 11, wherein a radial distance from a central axis of the first motor end cover to an outer circumferential surface of the third magnetic member is not equal to a radial distance from a central axis of the impeller to an outer circumferential surface of the fourth magnetic member.
13. The rotor limit structure of claim 7, wherein the fourth magnetic member is a magnetic block, the impeller is provided with a mounting hole matched with the motor rotating shaft, and the fourth magnetic member is sealed in the mounting hole by the motor rotating shaft.
14. A percutaneous blood pump, comprising a motor rotor, a motor rotating shaft and a rotor limiting structure as claimed in any one of claims 1 to 13, wherein the motor rotor is fixed on the motor rotating shaft, and one end of the motor rotating shaft passes through the first motor end cover to be connected with the impeller.
15. The percutaneous blood pump of claim 14, further comprising a second motor end cap, wherein the other end of the motor shaft is connected to the second motor end cap, a third hydrodynamic bearing is formed on a surface of the first motor end cap adjacent to the motor shaft, and a fourth hydrodynamic bearing is formed on a surface of the second motor end cap adjacent to the motor shaft.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811643091.5A CN111375098B (en) | 2018-12-29 | 2018-12-29 | Percutaneous blood pump and rotor limit structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811643091.5A CN111375098B (en) | 2018-12-29 | 2018-12-29 | Percutaneous blood pump and rotor limit structure thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024007793A1 (en) * | 2022-07-08 | 2024-01-11 | 深圳核心医疗科技股份有限公司 | Driving device and blood pump |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6264635B1 (en) * | 1998-12-03 | 2001-07-24 | Kriton Medical, Inc. | Active magnetic bearing system for blood pump |
| CN1572331A (en) * | 2003-05-28 | 2005-02-02 | 迈克尔·P·戈尔多夫斯基 | Passive non-contacting smart bearing suspension for turbo blood-pumps |
| CN101015716A (en) * | 2007-03-09 | 2007-08-15 | 清华大学 | Implanted non-contact minisize axial-flow blood pump |
| US20090234447A1 (en) * | 2007-04-30 | 2009-09-17 | Larose Jeffrey A | Centrifugal rotary blood pump |
| CN104208763A (en) * | 2014-09-15 | 2014-12-17 | 长治市久安人工心脏科技开发有限公司 | Magnetic suspension axial flow type blood pump |
| CN105978213A (en) * | 2016-06-30 | 2016-09-28 | 天津荣亨集团股份有限公司 | Magnetic fluid suspension bearing of disc motor |
| CN106512118A (en) * | 2016-11-02 | 2017-03-22 | 中南大学 | Totally-implanted magnetic liquid dual-suspension axial-flow blood pump |
| WO2018007120A1 (en) * | 2016-07-07 | 2018-01-11 | Berlin Heart Gmbh | Blood pump for cardiac assistance |
| EP3300749A1 (en) * | 2016-09-29 | 2018-04-04 | Berlin Heart GmbH | Blood pump with passive magnetic bearing |
| CN108066834A (en) * | 2017-11-02 | 2018-05-25 | 深圳核心医疗器械有限公司 | A kind of dual suspension artificial heart blood pump |
-
2018
- 2018-12-29 CN CN201811643091.5A patent/CN111375098B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6264635B1 (en) * | 1998-12-03 | 2001-07-24 | Kriton Medical, Inc. | Active magnetic bearing system for blood pump |
| CN1572331A (en) * | 2003-05-28 | 2005-02-02 | 迈克尔·P·戈尔多夫斯基 | Passive non-contacting smart bearing suspension for turbo blood-pumps |
| CN101015716A (en) * | 2007-03-09 | 2007-08-15 | 清华大学 | Implanted non-contact minisize axial-flow blood pump |
| US20090234447A1 (en) * | 2007-04-30 | 2009-09-17 | Larose Jeffrey A | Centrifugal rotary blood pump |
| CN104208763A (en) * | 2014-09-15 | 2014-12-17 | 长治市久安人工心脏科技开发有限公司 | Magnetic suspension axial flow type blood pump |
| CN105978213A (en) * | 2016-06-30 | 2016-09-28 | 天津荣亨集团股份有限公司 | Magnetic fluid suspension bearing of disc motor |
| WO2018007120A1 (en) * | 2016-07-07 | 2018-01-11 | Berlin Heart Gmbh | Blood pump for cardiac assistance |
| EP3300749A1 (en) * | 2016-09-29 | 2018-04-04 | Berlin Heart GmbH | Blood pump with passive magnetic bearing |
| CN106512118A (en) * | 2016-11-02 | 2017-03-22 | 中南大学 | Totally-implanted magnetic liquid dual-suspension axial-flow blood pump |
| CN108066834A (en) * | 2017-11-02 | 2018-05-25 | 深圳核心医疗器械有限公司 | A kind of dual suspension artificial heart blood pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024007793A1 (en) * | 2022-07-08 | 2024-01-11 | 深圳核心医疗科技股份有限公司 | Driving device and blood pump |
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| CN111375098B (en) | 2023-04-07 |
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