CN115845245B

CN115845245B - Magnetic suspension blood pump with standby driving structure

Info

Publication number: CN115845245B
Application number: CN202211696493.8A
Authority: CN
Inventors: 颜翊凡
Original assignee: Xinqing Medical Suzhou Co ltd
Current assignee: Xinqing Medical Suzhou Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2024-03-08
Anticipated expiration: 2042-12-28
Also published as: CN115845245A

Abstract

The invention discloses a magnetic suspension blood pump with a standby driving structure, which relates to the field of magnetic suspension blood pumps, and comprises a driving base and a pump head, wherein an impeller is arranged in the pump head, the driving base can suspend the impeller in the pump head, a driving motor is arranged in the driving base, the driving motor and the impeller are commonly connected with a magnetic coupling assembly, and when the driving motor can drive the impeller to rotate through the magnetic coupling assembly; the drive motor and the impeller are also commonly connected with a standby drive assembly. After the magnetic suspension and the magnetic coupling of the blood pump fail, the impeller is directly driven to rotate by the driving motor with higher stability and technical maturity, so that the blood pumping is stopped due to the fact that the impeller stops rotating after the magnetic suspension or the magnetic coupling fails, the blood loss risk of a user caused by the instability of the blood pump is prevented, and the safety of the blood pump is improved.

Description

Magnetic suspension blood pump with standby driving structure

Technical Field

The invention relates to the field of magnetic suspension blood pumps, in particular to a magnetic suspension blood pump with a standby driving structure.

Background

Heart failure is one of the major cardiovascular diseases facing humans at present, and although heart transplantation is effective in treating heart failure, the donor is lacking. The magnetic suspension blood pump is used as a substitute for heart transplantation, also called artificial heart, and can effectively relieve the problem of lack of heart donors. The magnetic force is adopted to suspend the impeller rotor in the pump body, so that the impeller rotor has the advantages of friction, no contact, no need of lubrication, low energy consumption, long service life and the like. The shape of the blood pump is tubular, so that the blood pump is more suitable for being implanted into a human body, and is one of hot spots in the current blood pump research.

The artificial heart pump, also called blood pump, refers to a device for temporarily or permanently replacing the heart of a patient and maintaining blood circulation, which can be used as a transition device when waiting for heart transplantation, and can restore the heart function of the patient to a certain extent or completely replace the heart-! An artificial heart is a device which utilizes mechanical motion to realize blood delivery to the blood circulation system of a human body so as to completely replace or partially replace the natural heart blood pumping function. Left ventricular assist, right ventricular assist, double heart asphyxia assist, and total artificial hearts can be generally classified according to their uses. In principle, the core component of an artificial heart is a pump device, so in a broad sense the artificial heart is sometimes also referred to as a heart pump, blood pump or blood pump.

The basic principle of the working principle of the centrifugal magnetic suspension artificial heart pump is that a motor drives a transmission device to rotate, a permanent magnet arranged in the transmission device generates a rotating magnetic field, and the magnetic field drives a permanent magnet arranged at the lower end of an impeller to rotate, so that an impeller rotor is driven to rotate. After flowing into the pump cavity from the center of the upper part of the pump body, the impeller rotor rotating at high speed guides the blood in the pump cavity and throws the blood to the outlet pipeline through the outer edge of the impeller, so that the blood is pumped out from the outlet, and the unidirectional flowing blood has arterial pressure required by human blood. The impeller rotor is stably suspended through the combined actions of the permanent magnets on the magnetic force support of the impeller and the hydrodynamic pressure of the blood, the permanent magnets are replaced by electromagnets in some magnetic suspension blood pumps, the eddy current sensor accurately detects the position of the impeller rotor and outputs an electric signal to the power amplifier and control system, the power amplifier and control system changes the current through closed loop feedback so as to control the magnitude and the direction of the electromagnetic force to ensure the axial stable suspension of the impeller rotor, and the magnetic field centripetal effect of the magnetic bearing and the hydrodynamic pressure generated by the eccentricity between the impeller rotor and the variable-diameter blood flow pipeline ensure the radial stable suspension of the impeller rotor. Thus, the problems of mechanical bearing sealing, friction heating and noise are avoided, and thrombus and blood dissolution are effectively reduced.

Chinese patent application CN115040775a discloses an in vitro magnetic levitation blood pump comprising a pump housing having an inlet and an outlet; an impeller housed within the pump housing and configured to be suspended within the pump housing and rotated by the motor to pump blood from the inlet to the outlet; the impeller includes: an impeller shell and an impeller arranged on the impeller shell; a rotor is arranged in the impeller shell, and the axial height of the rotor is 7.86-10.34 mm; further, the axial height of the rotor is 8.56-9.87 mm; furthermore, the axial height of the rotor is 8.834-9.537 mm, so that the coupling area of the active and passive magnets can be reduced, the influence of the magnetic coupling action between the active and passive magnets on the rigidity of the rotor is reduced, the rigidity of the rotor is improved, and the running stability is further improved;

chinese patent CN112546425B discloses a magnetic levitation motor and a magnetic levitation blood pump comprising a stator assembly and a rotor assembly located above the stator assembly with an axial gap between the stator assembly and the rotor assembly. The stator assembly includes a stator base, a plurality of stator teeth distributed along a circumference of the stator base and extending upward from an upper surface of the stator base, and a stator thrust body disposed in an internal cavity surrounded by the plurality of stator teeth, the stator teeth having stator coils wound thereon. The rotor assembly includes a rotor ring, a rotor drive magnet disposed on a lower surface of the rotor ring, and a rotor thrust magnet disposed in an interior cavity of the rotor ring. The stator thrust body and the rotor thrust magnet are configured to generate magnetic lines of force in an axial direction and to generate an axial repulsive force therebetween. The rotor driving magnet includes a plurality of portions each magnetized in an axial direction and adjacent portions have opposite magnetization directions so that the rotor driving magnet has a plurality of magnetic poles alternately, which can provide more freedom and flexibility in a flow path design of the blood pump when applied to the magnetic levitation blood pump, and thus allow the flow path of the blood pump to have a structure as simple as possible, which can make the fluid dynamics of the magnetic levitation blood pump very simple, thereby maximally reducing damage to blood.

The above-mentioned patents and prior art also have the following drawbacks:

some magnetic suspension blood pumps adopt driving motors as driving sources, the driving motors drive impellers to rotate through magnetic coupling, so that the impellers suspended in pump heads are used for pumping blood, but the magnetic suspension and the magnetic coupling of the blood pumps are not mechanically connected, under some working conditions such as jolt, collision and the like, the impellers are easy to be inclined and cannot rotate due to deflection force, the blood pumps stop supplying blood, and after the magnetic suspension and the magnetic coupling of the blood pumps fail, the blood pumps also stop supplying blood, and the blood loss danger occurs in a short time when a human body stops supplying blood, so that the replacement and maintenance of the blood pumps are not needed, and the safety is low.

Accordingly, the present application provides a magnetic levitation blood pump with a standby driving structure to meet the demand.

Disclosure of Invention

The utility model aims at providing a magnetic suspension blood pump with reserve drive structure, after blood pump magnetic suspension and magnetic coupling inefficacy, through the higher driving motor direct drive impeller rotation of stability and technical maturity, prevent that magnetic suspension or magnetic coupling inefficacy after, impeller stop rotating and lead to stopping pumping blood, prevent the user's risk of losing blood that the blood pump is unstable to lead to, improve blood pump's security.

In order to achieve the above purpose, the present application provides the following technical solutions: the magnetic suspension blood pump with the standby driving structure is characterized by comprising a driving base and a pump head, wherein an impeller is arranged in the pump head, the driving base can enable the impeller to suspend in the pump head, a driving motor is arranged in the driving base, the driving motor and the impeller are connected together to form a magnetic coupling assembly, and when the driving motor can drive the impeller to rotate through the magnetic coupling assembly;

the novel impeller driving device comprises an impeller, and is characterized by further comprising a standby driving assembly, wherein the standby driving assembly comprises an output rod, a transmission barrel and a receiving rod, the receiving rod is connected with the impeller, the driving motor is in driving connection with the output rod, the output rod can ascend into the transmission barrel and drive the transmission barrel to rotate, and when the output rod enters the transmission barrel and ascends continuously, the transmission barrel ascends and is sleeved on the receiving rod and drives the receiving rod to rotate, so that the receiving rod can drive the impeller to rotate.

Preferably, the standby driving assembly further comprises a clutch friction plate and two fixed friction plates, the fixed friction plates are driven to rotate by the driving motor, and when the clutch friction plates are propped against the fixed friction plates, the fixed friction plates drive the output rod to rotate by the clutch friction plates; the clutch friction plate is arranged between the two fixed friction plates; the clutch friction plate can be driven to synchronously move when the output rod ascends, so that the clutch friction plate is separated from contact with the corresponding fixed friction plate, the power of the output rod is cut off, and after the output rod ascends into the transmission cylinder and drives the transmission cylinder to ascend for a specified distance, the clutch friction plate is propped against the other fixed friction plate, and the power of the output rod is recovered.

Preferably, the top of the output rod and the bottom of the receiving rod are fixedly provided with meshing gears, the positions, close to two ends, of the inner wall of the transmission cylinder are fixedly provided with meshing annular gears, and one end of each meshing gear, which is opposite to the corresponding meshing annular gear, is in gradually shrinking arrangement.

Preferably, the magnetic coupling assembly is installed the output of driving motor, fixed mounting has electromagnetic push rod on the magnetic coupling assembly, clutch friction disc rotates to be connected on the electromagnetic push rod, fixed mounting has a rotary drum on the magnetic coupling assembly, fixed friction disc fixed mounting is in the inner wall of rotary drum, output pole fixed mounting is in on the clutch friction disc, fixed mounting has the spring that pushes down on the clutch friction disc, the top rotation of rotary drum is connected with the apron, the other end fixed mounting of spring is in push down on the apron, meshing gear fixed mounting is in the top of output pole, the apron with the through-hole has all been seted up to the center department of fixed friction disc.

Preferably, the bottom of the pump head is fixedly communicated with a sealing cylinder, the bottom of the sealing cylinder is provided with an opening, a sealing ring is rotationally connected to the transmission cylinder, and the sealing ring is in sliding fit in the sealing cylinder and is sealed with the sealing cylinder; the sealing device is characterized in that a retainer ring is fixedly arranged on the inner wall of the top of the sealing cylinder, a return spring is fixedly arranged on the sealing ring, and the other end of the return spring is fixedly arranged on the retainer ring.

Preferably, the magnetic coupling assembly comprises a plurality of active magnets and a plurality of passive magnets, the plurality of active magnets are uniformly and fixedly installed at the output end of the driving motor in a ring shape, the plurality of passive magnets are arranged on the impeller, the plurality of passive magnets correspond to the active magnets, the adjacent passive magnets are opposite in magnetic poles, and the adjacent active magnets are opposite in magnetic poles.

Preferably, the magnetic coupling assembly further comprises a wrapping sleeve, the wrapping sleeve is fixedly installed on the driving magnet, and the rotating cylinder and the electromagnetic push rod are fixedly installed on the wrapping sleeve.

Preferably, the pump head is internally provided with impellers, the impellers are provided with a plurality of impellers which are uniformly and fixedly arranged on the impellers, conical blocks are fixedly arranged on the impellers, and the receiving rods are fixedly arranged at the bottoms of the conical blocks.

Preferably, the retaining ring is rotationally connected with an anti-falling ring, the receiving rod penetrates through the anti-falling ring, a suspension shell is fixedly arranged at the bottom of the impeller, and the passive magnet is arranged in the suspension shell.

Preferably, the pump head and the driving base are connected with a fixing assembly, the fixing assembly comprises a locking block, a locking seat, a locking groove, a blocking groove and a blocking block, the locking seat is fixedly installed on the driving base, the locking groove is formed in the locking seat, the blocking groove is formed in the groove wall of the locking groove, the blocking block is in sliding fit in the blocking groove, and the locking block is fixedly installed on the pump head.

In summary, the invention has the technical effects and advantages that:

1. according to the invention, the impeller is suspended in the pump head through magnetic suspension, the impeller is driven to rotate through magnetic coupling when the driving motor rotates, so that the impeller pumps blood in the pump head, the impeller is not contacted with the pump head and the driving motor during rotation, heat is not easily generated by friction, the generated heat in the pump head is low, the blood is not easily solidified and denatured, after the magnetic suspension or the magnetic coupling fails, the impeller cannot suspend or cannot rotate, at the moment, the output rod rises to enter the transmission cylinder and drives the transmission cylinder to rotate, the output rod continuously rises to drive the transmission cylinder to rise, the transmission cylinder is sleeved on the receiving rod and drives the receiving rod to rotate, the receiving rod drives the impeller to rotate, the driving motor drives the impeller to rotate through mechanical transmission, the impeller is directly driven to rotate through the driving motor with higher stability and technical maturity, the impeller is prevented from stopping the pump blood after the magnetic suspension or the magnetic coupling fails, the impeller stops rotating, the blood losing risk of a user caused by instability of the blood pump is prevented, when the driving motor drives the impeller to rotate through the magnetic coupling, namely, the output rod is continuously risen to drive the transmission cylinder to rotate, the heat is not normally transmitted to the transmission cylinder, the heat is prevented from being separated from the transmission cylinder and the heat generating heat is normally, the heat is prevented from being transferred to the heat pump head is not normally, and is prevented from being transferred to the heat pump is normally from being rotated, and is not is rotated to the heat-transferred to the heat pump head is not normally;

2. in the invention, the two fixed friction plates are respectively arranged above and below the clutch friction plate, when the output rod ascends, the clutch friction plates are driven to synchronously move, the clutch friction plates are disconnected with the fixed friction plates positioned below, the fixed friction plates cannot drive the clutch friction plates to rotate, at the moment, the output rod ascends into the transmission cylinder and drives the transmission cylinder to ascend, when the transmission cylinder ascends to be sleeved on the receiving rod, the clutch friction plates are abutted against the fixed friction plates positioned above, at the moment, the fixed friction plates drive the clutch friction plates to rotate through friction force, and the clutch friction plates drive the output rod to rotate, so that the power of the output rod can be cut off in the process of meshing the output rod with the transmission cylinder and the process of meshing the transmission cylinder with the receiving rod, and the power connection is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of a drive base and pump head of the present invention;

FIG. 2 is a schematic view of a driving base structure in the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic view of the structure of the drive base and impeller of the present invention;

FIG. 5 is a schematic diagram of a spare drive assembly according to the present invention;

FIG. 6 is an enlarged view of portion B of FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic view of the structure of the drive base and suspension housing of the present invention;

FIG. 8 is a schematic view of the construction of the wrap-around sleeve of the present invention;

FIG. 9 is a schematic view of the structure of the driving base and the fixing assembly of the present invention;

FIG. 10 is an enlarged view of portion C of FIG. 9 in accordance with the present invention;

FIG. 11 is a schematic diagram of a mechanism of a driving motor according to the present invention;

FIG. 12 is a schematic diagram of the structure of the levitation shell, active magnet and passive magnet of the present invention;

FIG. 13 is a schematic view of the structure of the pump head and locking block of the present invention;

FIG. 14 is a schematic view showing the internal structure of a pump head according to the present invention;

fig. 15 is an enlarged view of section E of fig. 14 in accordance with the present invention.

In the figure: 1. a driving base; 2. a pump head; 3. an impeller; 4. a fixing assembly; 41. a locking block; 42. a locking seat; 43. a blocking piece; 5. a magnetic coupling assembly; 51. an active magnet; 52. a passive magnet; 53. a wrapping sleeve; 6. a backup drive assembly; 61. an output lever; 62. a transfer drum; 63. a receiving rod; 64. clutch friction plate; 65. fixing the friction plate; 71. a meshing gear; 72. engaging the ring gear; 81. an electromagnetic push rod; 82. a rotating cylinder; 83. pressing down the spring; 84. a cover plate; 91. a sealing cylinder; 92. a seal ring; 93. a retainer ring; 94. a return spring; 10. an impeller; 11. a conical block; 12. an anti-drop ring; 13. a suspension shell; 14. the motor is driven.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples: referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic suspension blood pump with the standby driving structure comprises a driving base 1 and a pump head 2, wherein an impeller 3 is arranged in the pump head 2, the impeller 3 can be suspended in the pump head 2 by the driving base 1, a driving motor 14 is arranged in the driving base 1, the driving motor 14 and the impeller 3 are commonly connected with a magnetic coupling assembly 5, and when the driving motor 14 can drive the impeller 3 to rotate through the magnetic coupling assembly 5; the drive motor 14 and the impeller 3 are also commonly connected with a standby drive assembly 6;

the standby driving assembly 6 comprises an output rod 61, a transmission barrel 62 and a receiving rod 63, the driving motor 14 drives the output rod 61 to rotate, the output rod 61 can ascend into the transmission barrel 62 and drive the transmission barrel 62 to rotate, when the output rod 61 enters the transmission barrel 62 and continues to ascend, the transmission barrel 62 ascends and is sleeved on the receiving rod 63 and drives the receiving rod 63 to rotate, and the receiving rod 63 can drive the impeller 3 to rotate.

During normal operation, the driving base 1 floats the impeller 3 in the pump head 2, when the output end of the driving motor 14 rotates, the driving motor 14 drives the impeller 3 to rotate through the magnetic coupling component 5, the impeller 3 rotates to pump blood in the pump head 2, the impeller 3 is driven to rotate through magnetic coupling because the impeller 3 is in the pump head 2 through magnetic suspension, when the impeller 3 fails in magnetic suspension or fails in magnetic coupling, the blood cannot be pumped in the pump head 2, the driving motor 14 drives the output rod 61 to rotate, at the moment, the output rod 61 moves upwards, the output rod 61 enters the transmission cylinder 62 and drives the output rod 61 to rotate, the output rod 61 drives the transmission cylinder 62 to rotate, and when the output rod 61 continues to rise after entering the transmission cylinder 62, the transmission cylinder 62 can be driven to rise, the transmission tube 62 rises and overlaps and establishes on the receiving rod 63 and drive receiving rod 63 rotation, receiving rod 63 drives impeller 3 rotation, thereby drive impeller 3 rotation pump blood through mechanical transmission, when impeller 3 magnetic suspension and magnetic coupling are all normal, impeller 3 and receiving rod 63 are suspended state, and receiving rod 63 separates with transmission tube 62, receiving rod 63 rotates and does not contact with transmission tube 62, receiving rod 63 can not rub and produce the heat, guarantee that the temperature of impeller 3 is suitable, simultaneously output rod 61 does not rise and get into transmission tube 62, when driving motor 14 drives output rod 61 rotation, output rod 61 can not drive transmission tube 62 rotation, make transmission tube 62 can not produce the heat, guarantee that the temperature in the pump head 2 is suitable, can not make the blood in the pump head 2 solidify or denature in normal use.

The impeller 3 is suspended in the pump head 2 through magnetic suspension, the driving motor 14 drives the impeller 3 to rotate through magnetic coupling when rotating, so that the impeller 3 pumps blood in the pump head 2, the impeller 3 is not contacted with the pump head 2 and the driving motor 14 when rotating, heat is not easy to generate by friction, the heat generation amount in the pump head 2 is low, the blood is not easy to solidify and denature, when the magnetic suspension or the magnetic coupling fails, the impeller 3 cannot suspend or cannot rotate, at the moment, the output rod 61 rises to enter the transmission cylinder 62 and drives the transmission cylinder 62 to rotate, the output rod 61 continuously rises to drive the transmission cylinder 62 to rise, the transmission cylinder 62 is sleeved on the receiving rod 63 and drives the receiving rod 63 to rotate, the receiving rod 63 drives the impeller 3 to rotate, the driving motor 14 drives the impeller 3 to rotate through mechanical transmission, and the impeller 3 pumps blood after the magnetic suspension or the magnetic coupling fails, through driving motor 14 direct drive impeller 3 rotation, prevent that magnetic suspension or magnetic coupling from inefficacy the back, impeller 3 stops rotating and leads to stopping pumping blood, prevent the user's risk of losing blood that the blood pump is unstable to lead to, improve the security of blood pump, when driving motor 14 drives impeller 3 through magnetic coupling and rotates, namely during the normal operation of blood pump, output rod 61 breaks away from with transfer cylinder 62, output rod 61 can not drive transfer cylinder 62 rotation, output rod 61 rotates can not transmit heat to transfer cylinder 62, also break away from with transfer cylinder 62 when accepting rod 63 rotates, can not drive transfer cylinder 62 rotation, prevent transfer cylinder 62 rotation and produce heat, guaranteed that the heat in impeller 3 and the pump head 2 is suitable, prevent that the heat generation is higher when pump head 2 normally operates, guarantee that the blood in the pump head 2 can not solidify and denature because of the heat quantity is high.

Further, a push plate is fixedly installed on the output rod 61, when the output rod 61 ascends into the transfer cylinder 62, the push plate is propped against the bottom of the transfer cylinder 62, and when the output rod 61 continues to ascend, the transfer cylinder 62 is driven to ascend by the push plate.

Further, a flow rate sensor is arranged in the blood pump, the flow rate sensor is in the prior art, when the blood pump is started, but the flow rate in the blood pump is lower than a set value, the standby driving assembly 6 is started, specifically, the output rod 61 is pushed to rise, the output rod 61 is enabled to rise into the transmission cylinder 62 and the transmission cylinder 62 is driven to rise and sleeved on the receiving rod 63, the driving motor 14 is enabled to drive the output rod 61 to rotate, the output rod 61 drives the transmission cylinder 62 to rotate, the transmission cylinder 62 drives the receiving rod 63 to rotate, and the receiving rod 63 drives the impeller 3 to rotate, so that the purpose of directly driving the impeller 3 by the driving motor 14 is achieved.

Further, since the driving motor 14 directly drives the impeller 3 to generate heat, an alarm device is further provided during actual use, after the magnetic suspension or magnetic coupling of the blood pump fails, the flow rate reduction in the pump head 2 is detected through the flow rate sensor, at this time, the alarm device sends out an audible and visual alarm or a remote alarm to remind people to overhaul, and the device is the prior art and is the conventional knowledge mastered by the personnel in the field.

Further, the center of the top of the pump head 2 is fixedly communicated with a liquid inlet pipe, and the side wall of the pump head 2 is fixedly communicated with a liquid outlet pipe.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the spare driving assembly 6 further includes a clutch friction plate 64 and two fixed friction plates 65, the fixed friction plates 65 are driven to rotate by the driving motor 14, and when the clutch friction plate 64 abuts against the fixed friction plates 65, the fixed friction plates 65 drive the output rod 61 to rotate by the clutch friction plate 64; the clutch friction plate 64 is arranged between two fixed friction plates 65; when the output rod 61 rises, the clutch friction plate 64 can be driven to synchronously move, so that the clutch friction plate 64 is separated from the corresponding fixed friction plate 65, the power of the output rod 61 is cut off, the output rod 61 rises into the transmission cylinder 62 and drives the transmission cylinder 62 to rise for a specified distance, the clutch friction plate 64 is abutted against the other fixed friction plate 65, and the power of the output rod 61 is recovered.

The two fixed friction plates 65 are respectively arranged above and below the clutch friction plate 64, when the output rod 61 ascends, the clutch friction plate 64 is driven to synchronously move, the clutch friction plate 64 is disconnected with the fixed friction plate 65 positioned below, the fixed friction plate 65 does not drive the clutch friction plate 64 to rotate, at the moment, the output rod 61 ascends into the transmission cylinder 62 and drives the transmission cylinder 62 to ascend, when the transmission cylinder 62 ascends to be sleeved on the receiving rod 63, the clutch friction plate 64 is abutted against the fixed friction plate 65 positioned above, at the moment, the fixed friction plate 65 drives the clutch friction plate 64 to rotate through friction force, and the clutch friction plate 64 drives the output rod 61 to rotate, so that the power of the output rod 61 can be cut off in the process of meshing the output rod 61 with the transmission cylinder 62 and the process of meshing the transmission cylinder 62 with the receiving rod 63, and the power connection is convenient.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the top of the output rod 61 and the bottom of the receiving rod 63 are fixedly provided with engaging gears 71, the inner wall of the transmission tube 62 is fixedly provided with engaging ring gears 72 near both ends, and one end teeth of the engaging gears 71 opposite to the engaging ring gears 72 are gradually contracted.

The output rod 61 rises to drive the corresponding meshing gear 71 to rise, so that the meshing gear 71 enters the meshing annular gear 72 to be meshed with the meshing annular gear 72, the output rod 61 rotates to drive the output rod 61 to continuously rise to drive the transmission cylinder 62 to rise, the transmission cylinder 62 is sleeved on the receiving rod 63, the meshing annular gear 72 in the transmission cylinder 62 is meshed with the meshing gear 71 arranged on the receiving rod 63, the receiving rod 63 is driven to rotate when the transmission cylinder 62 rotates, and the opposite ends of the meshing gear 71 and the meshing annular gear 72 are in shrinkage arrangement, so that the meshing gear 71 and the meshing annular gear 72 are not blocked when being meshed.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 is mounted at the output end of the driving motor 14, the electromagnetic push rod 81 is fixedly mounted on the magnetic coupling assembly 5, the clutch friction plate 64 is rotatably connected to the electromagnetic push rod 81, the rotating cylinder 82 is fixedly mounted on the magnetic coupling assembly 5, the fixed friction plate 65 is fixedly mounted on the inner wall of the rotating cylinder 82, the output rod 61 is fixedly mounted on the clutch friction plate 64, the clutch friction plate 64 is fixedly mounted with the pressing spring 83, the top of the rotating cylinder 82 is rotatably connected with the cover plate 84, the other end of the pressing spring 83 is fixedly mounted on the cover plate 84, the meshing gear 71 is fixedly mounted at the top of the output rod 61, and through holes are formed in the centers of the cover plate 84 and the fixed friction plate 65.

The driving motor 14 drives the rotating cylinder 82 to rotate, the rotating cylinder 82 drives the fixed friction plate 65 to rotate, the electromagnetic push rod 81 can push the clutch friction plate 64 and the output rod 61 to rise when being electrified, the clutch friction plate 64 rises to drive the pressing spring 83 to store force, the electromagnetic push rod 81 is powered by the conductive slip ring in the prior art, the conductive slip ring is the prior art, and not described too much, so that the electromagnetic push rod 81 can ensure power supply when rotating, and when the electromagnetic push rod 81 is powered off, the pressing spring 83 resets to push the clutch friction plate 64 to descend.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, a sealing cylinder 91 is fixedly connected to the bottom of the pump head 2, the bottom of the sealing cylinder 91 is provided with an opening, a sealing ring 92 is rotatably connected to the transmission cylinder 62, and the sealing ring 92 is slidably matched in the sealing cylinder 91 and seals between the sealing cylinder 91; a retainer ring 93 is fixedly arranged on the top inner wall of the sealing barrel 91, a return spring 94 is fixedly arranged on the sealing ring 92, and the other end of the return spring 94 is fixedly arranged on the retainer ring 93.

The transfer cylinder 62 is moved in the sealing cylinder 91, the sealing cylinder 91 does not leak the pump head 2, the sealing performance is better, the transfer cylinder 62 is upward pressed with the return spring 94, and when the output rod 61 is lowered, the return spring 94 is reset to push the transfer cylinder 62 to be lowered.

Further, the bottom of the sealing cylinder 91 is fixedly provided with a block, and when the transfer cylinder 62 descends to the bottom of the sealing cylinder 91, the block is abutted against the bottom of the transfer cylinder 62, so that the transfer cylinder 62 is prevented from being separated from the sealing cylinder 91.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 includes a plurality of active magnets 51 and a plurality of passive magnets 52, the plurality of active magnets 51 are uniformly and fixedly installed at the output end of the driving motor 14 in a ring shape, the plurality of passive magnets 52 are disposed on the impeller 3, the plurality of passive magnets 52 correspond to the active magnets 51, the adjacent passive magnets 52 are opposite in magnetic poles, and the adjacent active magnets 51 are opposite in magnetic poles.

The output end of the driving motor 14 drives the plurality of driving magnets 51 to rotate when rotating, the plurality of driving magnets 51 attract the driven magnets 52 with the same magnetic poles, and the adjacent driving magnets 51 have opposite magnetic poles because the adjacent driven magnets 52 have opposite magnetic poles, the driving magnets 51 can drive the driven magnets 52 to rotate when rotating, and when the driving magnets 51 and the driven magnets 52 relatively rotate, the driving magnets 51 need to overcome the repulsive force of the adjacent driven magnets 52, so that the relative rotation between the driving magnets 51 and the driven magnets 52 is not easy to occur.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 further includes a wrap 53, the wrap 53 is fixedly mounted on the driving magnet 51, and the rotating cylinder 82 and the electromagnetic push rod 81 are fixedly mounted on the wrap 53.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, an impeller 10 is provided in the pump head 2, the impeller 3 is provided with a plurality of impellers which are uniformly and fixedly mounted on the impeller 3, a tapered block 11 is fixedly mounted on the impeller 10, a receiving rod 63 is fixedly mounted at the bottom of the tapered block 11, the tapered block 11 guides blood to the outer ring of the pump head 2, and the blood is introduced from the center of the top of the pump head 2 and discharged from the side under the centrifugal force generated when the impeller 3 rotates.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the retaining ring 93 is rotatably connected with the anti-falling ring 12, the receiving rod 63 is disposed through the anti-falling ring 12, the bottom of the impeller 10 is fixedly provided with the suspension housing 13, and the passive magnet 52 is disposed in the suspension housing 13.

When the transfer tube 62 is lifted up and sleeved on the receiving rod 63, the anti-drop ring 12 can bear against the meshing gear 71 on the receiving rod 63, and the meshing gear 71 and the receiving rod 63 are prevented from being lifted up synchronously under the pushing of the transfer tube 62.

Further, a suspension assembly for suspending the impeller 3 in the pump head 2 is commonly arranged in the suspension housing 13 and the driving base 1, which is a prior art, and specifically refers to an in vitro magnetic suspension blood pump disclosed in chinese patent application CN115040775 a.

Further, as another specific embodiment, the suspension assembly provided in the suspension housing 13 at least includes a plurality of stator magnets and a rotor magnet, the stator magnets are uniformly provided in the driving base 1 in a ring shape, the rotor magnet is uniformly provided in the suspension housing 13 in a ring shape, the stator magnets are provided on the outer ring of the rotor magnet, the stator magnets are provided opposite to the poles of the rotor magnet, so that the poles of one end of the stator magnet opposite to the rotor magnet are the same, the stator magnet limits the rotor magnet through repulsive force, the driving magnet 51 and the driven magnet 52 are coaxially provided, and the impeller 3 is not easy to horizontally displace, the suspension assembly further includes a stator magnet ring and a rotor magnet ring, the stator magnet ring is provided in the driving base 1, the rotating magnet ring is provided in the suspension housing 13, the stator magnet ring is opposite to the poles of the rotor magnet ring, the rotor magnet ring is provided above the stator magnet ring, and the stator magnet ring repels the stator magnet ring, so that the stator magnet ring resists the gravity of the impeller 3 and the suspension housing 13 to suspend.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the pump head 2 and the driving base 1 are commonly connected with a fixing component 4, the fixing component 4 comprises a locking block 41, a locking seat 42, a locking groove, a blocking groove and a blocking block 43, the locking seat 42 is fixedly installed on the driving base 1, the locking groove is formed in the locking seat 42, the blocking groove is formed in the groove wall of the locking groove, the blocking block 43 is slidably matched in the blocking groove, the locking block 41 is fixedly installed on the pump head 2, the locking block 41 is pressed into the locking groove, the pump head 2 is located on the driving base 1, the blocking block 43 is pushed to move in the blocking groove, the blocking block 43 moves to the position above the locking block 41, the locking block 41 is blocked in the locking groove, the pump head 2 can be locked, the pump head 2 is prevented from being separated from the driving base 1 in the using process, and the operation is simple.

Further, the locking groove is formed in the groove wall, far away from the blocking groove, of the locking groove, the groove wall of the locking groove is gradually contracted, and when the blocking block 43 moves into the locking groove, the locking groove is in interference fit with the blocking block 43, so that the blocking block 43 is not easy to separate after the blocking block 43 enters the locking groove.

The working principle of the invention is as follows: during normal operation, the impeller 3 is suspended in the pump head 2 by the driving base 1, when the output end of the driving motor 14 rotates, the output end of the driving motor 14 rotates to drive the plurality of driving magnets 51 to rotate, the plurality of driving magnets 51 attract the driven magnets 52 with the same magnetic poles, the adjacent driven magnets 52 have opposite magnetic poles, the driving magnets 51 rotate to drive the driven magnets 52 to rotate, when the driving magnets 51 and the driven magnets 52 rotate relatively, the driving magnets 51 need to overcome the repulsive force of the adjacent driven magnets 52, thereby ensuring that the driving magnets 51 and the driven magnets 52 are difficult to rotate relatively, the driven magnets 52 drive the impeller 10 to rotate through the suspension shell 13, the impeller 10 drives the impeller 3 to rotate, the blood in the pump head 2 is pumped out due to the impeller 3 being magnetically suspended in the pump head 2, the impeller 3 is driven to rotate through magnetic coupling, when the impeller 3 fails in magnetic suspension or fails in magnetic coupling, blood cannot be pumped out in the pump head 2, the output rod 61 is driven to rotate when the driving motor 14 rotates, at the moment, the output rod 61 moves upwards, the output rod 61 drives the clutch friction plate 64 to synchronously move, the clutch friction plate 64 is disconnected with the fixed friction plate 65 positioned below, the fixed friction plate 65 does not drive the clutch friction plate 64 to rotate, the output rod 61 rises to drive the corresponding meshing gear 71 to rise, the meshing gear 71 enters the meshing annular gear 72 to be meshed with the meshing annular gear 72, the output rod 61 rotates to drive the output rod 61 to continuously rise to drive the transmission cylinder 62 to rise, the transmission cylinder 62 is sleeved on the receiving rod 63, the meshing annular gear 72 in the transmission cylinder 62 is meshed with the meshing gear 71 arranged on the receiving rod 63, and the transmission cylinder 62 is driven to rotate when the transmission cylinder 62 rotates, the clutch friction plate 64 is propped against the fixed friction plate 65 positioned above, at the moment, the fixed friction plate 65 drives the clutch friction plate 64 to rotate through friction force, the clutch friction plate 64 drives the output rod 61 to rotate, the output rod 61 drives the transmission cylinder 62 to rotate, the output rod 61 drives the receiving rod 63 to rotate, the receiving rod 63 drives the impeller 3 to rotate through the suspension shell 13 and the impeller 10, thereby driving the impeller 3 to rotate for pumping blood through mechanical transmission, after magnetic suspension or magnetic coupling failure, the impeller 3 is directly driven to rotate through the driving motor 14, after the magnetic suspension or magnetic coupling failure, the impeller 3 stops rotating to stop pumping blood, the risk of blood loss of a user caused by unstable blood pump is prevented, the safety of the blood pump is improved, when the driving motor 14 drives the impeller 3 to rotate through magnetic coupling, namely, when the blood pump normally operates, the output rod 61 is separated from the transmission cylinder 62, the output rod 61 can not drive the transmission cylinder 62 to rotate, the output rod 61 can not transmit heat to the transmission cylinder 62, the receiving rod 63 can also be separated from the transmission cylinder 62 when rotating, the transmission cylinder 62 can not be driven to rotate, the transmission cylinder 62 is prevented from rotating to generate heat, the proper heat between the impeller 3 and the pump head 2 is ensured, the heat generation is prevented from being higher when the pump head 2 normally operates, and the blood in the pump head 2 can not be solidified and denatured due to high heat.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.

Claims

1. The magnetic suspension blood pump with the standby driving structure is characterized by comprising a driving base (1) and a pump head (2), wherein an impeller is arranged in the pump head (2), the driving base (1) can enable the impeller to suspend in the pump head (2), a driving motor (14) is arranged in the driving base (1), the driving motor (14) and the impeller are jointly connected with a magnetic coupling assembly (5), and the driving motor (14) can drive the impeller to rotate through the magnetic coupling assembly (5);

the device comprises an impeller, and is characterized by further comprising a standby driving assembly (6), wherein the standby driving assembly (6) comprises an output rod (61), a transmission barrel (62) and a receiving rod (63), the receiving rod (63) is connected with the impeller, the driving motor (14) is in driving connection with the output rod (61), the output rod (61) can ascend into the transmission barrel (62) and drive the transmission barrel (62) to rotate, and when the output rod (61) enters the transmission barrel (62) and continues to ascend, the transmission barrel (62) ascends and is sleeved on the receiving rod (63) and drives the receiving rod (63) to rotate, so that the receiving rod (63) can drive the impeller to rotate;

the standby driving assembly (6) further comprises a clutch friction plate (64) and two fixed friction plates (65), the fixed friction plates (65) are driven to rotate through the driving motor (14), and when the clutch friction plates (64) are propped against the fixed friction plates (65), the fixed friction plates (65) drive the output rod (61) to rotate through the clutch friction plates (64); the clutch friction plate (64) is arranged between the two fixed friction plates (65); the clutch friction plate (64) can be driven to synchronously move when the output rod (61) ascends, so that the clutch friction plate (64) is separated from the corresponding fixed friction plate (65), the power of the output rod (61) is cut off, and after the output rod (61) ascends into the transmission cylinder (62) and drives the transmission cylinder (62) to ascend for a specified distance, the clutch friction plate (64) is propped against the other fixed friction plate (65), and the power of the output rod (61) is recovered.

2. A magnetic levitation blood pump having a standby driving structure as set forth in claim 1, wherein: the top of output pole (61) with the bottom of accepting pole (63) is all fixed mounting has meshing gear (71), the inner wall of transfer section of thick bamboo (62) is close to both ends position and all is fixed mounting has meshing ring gear (72), meshing gear (71) with the relative one end tooth of meshing ring gear (72) is the gradual shrinkage setting.

3. A magnetic levitation blood pump having a standby driving structure as set forth in claim 2, wherein: the magnetic coupling assembly (5) is installed the output of driving motor (14), fixed mounting has electromagnetic push rod (81) on magnetic coupling assembly (5), clutch disc (64) rotate and connect electromagnetic push rod (81) are last, fixed mounting has a rotary drum (82) on magnetic coupling assembly (5), fixed friction disc (65) fixed mounting is in the inner wall of rotary drum (82), output rod (61) fixed mounting is in on clutch disc (64), fixed mounting has on clutch disc (64) pushes down spring (83), the top rotation of rotary drum (82) is connected with apron (84), the other end fixed mounting of pushing down spring (83) is in on apron (84), meshing gear (71) fixed mounting is in the top of output rod (61), apron (84) with the center department of fixed friction disc (65) has all seted up the through-hole.

4. A magnetic levitation blood pump having a standby driving structure according to claim 3, wherein: the bottom of the pump head (2) is fixedly communicated with a sealing cylinder (91), the bottom of the sealing cylinder (91) is provided with an opening, a sealing ring (92) is rotationally connected to the transmission cylinder (62), and the sealing ring (92) is in sliding fit in the sealing cylinder (91) and is sealed with the sealing cylinder (91); a retainer ring (93) is fixedly arranged on the inner wall of the top of the sealing cylinder (91), a return spring (94) is fixedly arranged on the sealing ring (92), and the other end of the return spring (94) is fixedly arranged on the retainer ring (93).

5. A magnetic levitation blood pump having a standby driving structure as defined in claim 4, wherein: the magnetic coupling assembly (5) comprises a plurality of active magnets (51) and a plurality of passive magnets (52), the plurality of active magnets (51) are uniformly and fixedly installed at the output end of the driving motor (14) in a ring shape, the plurality of passive magnets (52) are arranged on the impeller, the plurality of passive magnets (52) correspond to the active magnets (51), the adjacent passive magnets (52) are opposite in magnetic poles, and the adjacent active magnets (51) are opposite in magnetic poles.

6. A magnetic levitation blood pump having a standby driving structure as defined in claim 5, wherein: the magnetic coupling assembly (5) further comprises a wrapping sleeve (53), the wrapping sleeve (53) is fixedly installed on the driving magnet (51), and the rotating cylinder (82) and the electromagnetic push rod (81) are fixedly installed on the wrapping sleeve (53).

7. A magnetic levitation blood pump having a standby driving structure as defined in claim 5, wherein: the pump head (2) is internally provided with an impeller, a plurality of blades are arranged on the impeller and are uniformly and fixedly arranged on the impeller, a conical block (11) is fixedly arranged on the impeller, and a receiving rod (63) is fixedly arranged at the bottom of the conical block (11).

8. A magnetic levitation blood pump having a standby driving structure as defined in claim 7, wherein: the retaining ring (93) is rotationally connected with an anti-falling ring (12), the receiving rod (63) penetrates through the anti-falling ring (12), the bottom of the impeller is fixedly provided with a suspension shell (13), and the passive magnet (52) is arranged in the suspension shell (13).

9. A magnetic levitation blood pump having a standby driving structure as set forth in claim 1, wherein: the pump head (2) with drive base (1) is connected with fixed subassembly (4) jointly, fixed subassembly (4) are including locking piece (41), locking seat (42), locking groove, stop groove and stop piece (43), locking seat (42) fixed mounting are in on drive base (1), the locking groove is seted up on locking seat (42), stop the groove and be seted up on the cell wall of locking groove, stop piece (43) sliding fit in stopping the inslot, locking piece (41) fixed mounting is in on pump head (2).