CN115845245A - Magnetic suspension blood pump with spare driving structure - Google Patents

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 enable the impeller to be suspended in the pump head, a driving motor is arranged in the driving base, the driving motor and the impeller are jointly 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 backup 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, and after the magnetic suspension or the magnetic coupling fail, the impeller stops rotating to stop pumping blood, so that 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 spare 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 human beings at present, and heart transplantation is effective in treating heart failure, but is deficient in donors. The magnetic suspension blood pump is used as a substitute for heart transplantation, also called artificial heart, and can effectively relieve the problem of shortage of heart donors. Because the magnetic force is adopted to suspend the impeller rotor in the pump body, the pump has the advantages of friction, no contact, no need of lubrication, low energy consumption, long service life and the like. And 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 the hot spots of the current blood pump research.

An artificial heart pump, also known as a blood pump, is a device for temporarily or permanently replacing the heart of a patient with a mechanical device to maintain blood circulation, which can be used not only as a transition device while waiting for heart transplantation, but also to restore the heart function of the patient to a certain extent, or completely replace the heart! The 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 or partially replace the blood pumping function of the natural heart. Generally, the heart can be divided into left ventricle assist, right ventricle assist, double asphyxia assist and total artificial heart according to the purpose. In principle, the core component of an artificial heart is a pump device, so that an artificial heart is also sometimes referred to in a broad sense as a heart pump, blood pump or blood pump.

The centrifugal magnetic suspension artificial heart pump has the basic working principle 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 the permanent magnet arranged at the lower end of an impeller to rotate, so that an impeller rotor is driven to rotate. After blood flows 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 blood flowing in one direction has arterial pressure required by human blood. The permanent magnet is used for supporting the impeller by magnetic force and realizing stable suspension of the impeller rotor under the combined action of blood dynamic pressure, the electromagnet can be used for replacing the permanent magnet in some magnetic suspension blood pumps, the eddy current sensor can accurately detect the position of the impeller rotor and output an electric signal to the power amplifier and control system, the power amplifier and control system can control the size and the direction of the electromagnet force by closed-loop feedback to change the current so as to ensure the axial stable suspension of the impeller rotor, and the magnetic field centripetal effect of the magnetic bearing and the blood dynamic pressure generated by the eccentricity between the impeller rotor and a variable-diameter blood flow pipeline can ensure the radial stable suspension of the impeller rotor. Therefore, the problems of mechanical bearing sealing, frictional heating and noise are avoided, and thrombus and blood dissolution are effectively reduced.

Chinese patent application CN115040775a discloses an extracorporeal magnetic suspension blood pump, which comprises a pump housing having an inlet and an outlet; an impeller housed within the pump housing and configured to be suspendable within the pump housing and driven in rotation by the motor to pump blood from the inlet to the outlet; the impeller includes: the impeller comprises 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, the coupling area of the active and passive magnets can be reduced, the influence of the magnetic coupling effect 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 improved;

chinese patent CN112546425B discloses a magnetic levitation motor and a magnetic levitation blood pump, which includes a stator assembly and a rotor assembly located above the stator assembly, and an axial gap is provided between the stator assembly and the rotor assembly. The stator assembly comprises a stator base body, a plurality of stator teeth and a stator thrust body, wherein the stator teeth are distributed along the circumference of the stator base body and extend upwards from the upper surface of the stator base body, the stator thrust body is arranged in an inner cavity surrounded by the plurality of stator teeth, and stator coils are wound on the stator teeth. The rotor assembly includes a rotor ring, rotor drive magnets disposed on a lower surface of the rotor ring, and rotor thrust magnets 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 the axial direction and generate an axial repulsive force therebetween. The rotor drive magnet comprises a plurality of sections, each section being magnetized in an axial direction, and adjacent sections having opposite magnetization directions, so that the rotor drive magnet has a plurality of alternating poles, enabling more freedom and flexibility in designing the flow path of the blood pump when applied to a magnetic levitation blood pump, and thus allowing the flow path of the blood pump to have a structure as simple as possible, making the fluid dynamics of the magnetic levitation blood pump very simple, thereby maximally reducing the damage to the blood.

The above patents and prior art also suffer from the following drawbacks:

some magnetic suspension blood pumps adopt a driving motor as a driving source, the driving motor drives an impeller to rotate through magnetic coupling, so that the impeller suspended in a pump head pumps blood, but the magnetic suspension and the magnetic coupling of the blood pump are not mechanically connected, under some working conditions, such as bump and collision, the impeller and the impeller are easily caused to be deflected and inclined to be incapable of rotating, the blood supply of the blood pump is stopped, and after the magnetic suspension and the magnetic coupling of the blood pump are failed, the blood supply of the blood pump can also be stopped, the blood loss danger can occur in a short time when a human body stops supplying blood, the blood pump cannot be replaced and maintained in time, and the safety is low.

Accordingly, the present application provides a magnetic levitation blood pump with a redundant drive configuration to meet the needs.

Disclosure of Invention

An object of this application is to provide a magnetic suspension blood pump with reserve drive structure, after blood pump magnetic suspension and magnetic coupling became invalid, directly drive the impeller rotation through the higher driving motor of stability and technical maturity, prevent that magnetic suspension or magnetic coupling are invalid after, the impeller stall leads to stopping the pump blood, prevents the unstable user's that leads to of blood pump risk of losing blood, improves the security of blood pump.

In order to achieve the above purpose, the present application provides the following technical solutions: a magnetic suspension blood pump with a 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 be suspended in the pump head, a driving motor is arranged in the driving base, the driving motor and the impeller are jointly connected with a magnetic coupling assembly, and when the driving motor can drive the impeller to rotate through the magnetic coupling assembly;

still include reserve drive assembly, reserve drive assembly includes delivery rod, a transmission section of thick bamboo and accepts the pole, accept the pole with the impeller is connected, driving motor with the delivery rod drive is connected, the delivery rod can rise to get into drive transmission section of thick bamboo is interior and drive a transmission section of thick bamboo and rotate, the delivery rod gets into when continuing to rise behind the transmission section of thick bamboo, the transmission section of thick bamboo rises the cover and establishes accept on the pole and drive accept the pole and rotate, so that it can drive to accept the pole the impeller rotates.

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 plate abuts against the fixed friction plates, the fixed friction plates drive the output rod to rotate through the clutch friction plate; the clutch friction plate is arranged between the two fixed friction plates; when the output rod ascends, the output rod can drive the clutch friction plates to move synchronously, so that the clutch friction plates are separated from the corresponding fixed friction plates, the power of the output rod is cut off, after the output rod ascends into the transmission cylinder and drives the transmission cylinder to ascend for a specified distance, the clutch friction plates are abutted against the other fixed friction plates, and the power of the output rod is recovered.

Preferably, meshing gears are fixedly mounted at the top of the output rod and the bottom of the receiving rod, meshing inner gear rings are fixedly mounted on the inner wall of the transmission cylinder close to the two ends of the transmission cylinder, and teeth at one ends of the meshing gears, opposite to the meshing inner gear rings, are arranged in a gradually-shrinking manner.

Preferably, the magnetic coupling assembly is installed at the output end of the driving motor, an electromagnetic push rod is fixedly installed on the magnetic coupling assembly, the clutch friction plate is rotatably connected to the electromagnetic push rod, a rotating cylinder is fixedly installed on the magnetic coupling assembly, a fixed friction plate is fixedly installed on the inner wall of the rotating cylinder, the output rod is fixedly installed on the clutch friction plate, a pressing spring is fixedly installed on the clutch friction plate, a cover plate is rotatably connected to the top of the rotating cylinder, the other end of the pressing spring is fixedly installed on the cover plate, the meshing gear is fixedly installed at the top of the output rod, and through holes are formed in the center of the cover plate and the center of the fixed friction plate.

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 rotatably connected to the transfer 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 check ring is fixedly mounted on the inner wall of the top of the sealing barrel, a return spring is fixedly mounted on the sealing ring, and the other end of the return spring is fixedly mounted on the check ring.

Preferably, the magnetic coupling assembly includes a plurality of driving magnets and a plurality of driven magnets, the plurality of driving magnets are uniformly and fixedly mounted on the output end of the driving motor in an annular shape, the plurality of driven magnets are disposed on the impeller, the plurality of driven magnets correspond to the driving magnets, the magnetic poles of the adjacent driven magnets are opposite, and the magnetic poles of the adjacent driving magnets are opposite.

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

Preferably, be provided with the impeller in the pump head, the impeller is provided with a plurality of and even fixed mounting is in on the impeller, fixed mounting has the toper piece on the impeller, accept pole fixed mounting be in the bottom of toper piece.

Preferably, the retainer ring is rotatably connected with an anti-dropping ring, the receiving rod penetrates through the anti-dropping ring, a suspension shell is fixedly mounted at the bottom of the impeller, and the driven magnet is arranged in the suspension shell.

Preferably, the pump head with drive base is connected with fixed subassembly jointly, fixed subassembly includes locking piece, locking seat, locking groove, blocks the groove and blocks the piece, and locking seat fixed mounting is in on the drive base, the locking groove is seted up on the locking seat, it sets up to block the groove on the cell wall of locking groove, it is in to block a sliding fit block the inslot, locking piece fixed mounting is in on the pump head.

In conclusion, the technical effects and advantages of the invention are as follows:

1. in the invention, the impeller is suspended in the pump head by magnetic suspension, the impeller is driven to rotate by magnetic coupling when the driving motor rotates, so that blood in the pump head is pumped out by the impeller, the impeller does not contact with the pump head and the driving motor when rotating, heat is not easy to generate by friction, the heat generation amount in the pump head is low, the blood is not easy to solidify and denature, when the magnetic suspension or the magnetic coupling fails, the impeller cannot suspend or rotate, at the moment, the output rod rises to enter the transfer cylinder and drive the transfer cylinder to rotate, the output rod continues to rise to drive the transfer cylinder to rise, the transfer 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 by a mechanical driving belt, so that the impeller pumps blood, after the magnetic suspension or the magnetic coupling fails, the impeller is directly driven to rotate by the driving motor with higher stability and technical maturity, the impeller is prevented from stopping rotating to stop pumping blood after magnetic suspension or magnetic coupling fails, the risk of blood loss of a user caused by instability of the blood pump is prevented, the safety of the blood pump is improved, when the driving motor drives the impeller to rotate by magnetic coupling, namely the blood pump runs normally, the output rod is separated from the transfer cylinder, the output rod cannot drive the transfer cylinder to rotate, the output rod cannot transfer heat to the transfer cylinder, the receiving rod also is separated from the transfer cylinder when rotating, the transfer cylinder cannot be driven to rotate, the heat generated by the rotation of the transfer cylinder is prevented, the proper heat in the impeller and the pump head is ensured, the high heat generation during normal operation of the pump head is prevented, and the blood in the pump head cannot be solidified and denatured due to the high heat;

2. according to 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 plate is driven to synchronously move, the clutch friction plate is disconnected with the fixed friction plate positioned below, the fixed friction plate cannot drive the clutch friction plate to rotate, at the moment, the output rod ascends into the transmission barrel and drives the transmission barrel to ascend, when the transmission barrel ascends to be sleeved on the receiving rod, the clutch friction plate abuts against the fixed friction plate positioned above, at the moment, the fixed friction plate drives the clutch friction plate to rotate through friction force, the clutch friction plate drives the output rod to rotate, the power of the output rod can be cut off in the meshing process of the output rod and the transmission barrel and the meshing process of the transmission barrel and 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 needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic diagram of the construction of a drive base and pump head according to the present invention;

FIG. 2 is a schematic structural view of a driving base according to 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 drive base and impeller of the present invention;

FIG. 5 is a schematic view of a backup 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 structural view of a drive base and a floating shell according to the present invention;

FIG. 8 is a schematic view of the structure of the packing sleeve of the present invention;

FIG. 9 is a schematic view of the drive base and retaining 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 view of the mechanism of the driving motor of the present invention;

FIG. 12 is a schematic view of the structure of the suspension housing, the active magnet and the passive magnet according to the present invention;

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

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

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

In the figure: 1. a drive base; 2. a pump head; 3. an impeller; 4. a fixing assembly; 41. a locking block; 42. a locking seat; 43. a blocking block; 5. a magnetic coupling assembly; 51. an active magnet; 52. a passive magnet; 53. wrapping the sleeve; 6. a backup drive assembly; 61. an output rod; 62. a transfer drum; 63. a receiving lever; 64. a clutch friction plate; 65. fixing the friction plate; 71. a meshing gear; 72. an inner gear ring is engaged; 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. preventing the ring from falling off; 13. a suspended shell; 14. the motor is driven.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1, 4, 6, 10, 11 and 12, a magnetic suspension blood pump with a standby driving structure includes a drivingbase 1 and apump head 2, animpeller 3 is disposed in thepump head 2, the drivingbase 1 can suspend theimpeller 3 in thepump head 2, a drivingmotor 14 is disposed in thedriving base 1, the drivingmotor 14 and theimpeller 3 are connected together with a magnetic coupling assembly 5, when the drivingmotor 14 can drive theimpeller 3 to rotate through the magnetic coupling assembly 5; the drivingmotor 14 and theimpeller 3 are also connected with aspare driving assembly 6 together;

thestandby driving assembly 6 comprises anoutput rod 61, atransmission cylinder 62 and a receivingrod 63, the drivingmotor 14 drives theoutput rod 61 to rotate, theoutput rod 61 can ascend into thetransmission cylinder 62 and drive thetransmission cylinder 62 to rotate, after theoutput rod 61 enters into thetransmission cylinder 62 and continues to ascend, thetransmission cylinder 62 ascends to be sleeved on the receivingrod 63 and drives the receivingrod 63 to rotate, and the receivingrod 63 can drive theimpeller 3 to rotate.

During normal operation, the driving base 1 suspends 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 assembly 5, the impeller 3 rotates to pump blood in the pump head 2, because the impeller 3 is in the pump head 2 through magnetic suspension, the impeller 3 is also driven to rotate through magnetic coupling, when the impeller 3 fails in magnetic suspension or magnetic coupling, blood cannot be pumped out in the pump head 2, the driving motor 14 drives the output rod 61 to rotate when rotating, the output rod 61 moves upwards, the output rod 61 enters the transfer cylinder 62 and drives the output rod 61 to rotate, the output rod 61 drives the transfer cylinder 62 to rotate, when the output rod 61 enters the transfer cylinder 62 and then continuously rises, the transfer cylinder 62 can drive the transfer cylinder 62 to rise, the transfer cylinder 62 rises to be sleeved on the receiving rod 63 and drives the receiving rod 63 to rotate, the receiving rod 63 drives the impeller 3 to rotate, blood is pumped through the mechanical transmission impeller 3, when the impeller 3 and the pump head are both normal, the receiving rod 63 and the receiving rod 63 do not contact with the transfer rod 62, the magnetic coupling motor 62 can not generate heat when the heat in the magnetic coupling, and the magnetic coupling does not generate heat, and the heat can not generate proper heat when the heat and the heat can not be transmitted to the blood can not be used by the magnetic coupling 2.

The impeller 3 is suspended in the pump head 2 through magnetic suspension, the impeller 3 is driven to rotate through magnetic coupling when the driving motor 14 rotates, the impeller 3 pumps blood in the pump head 2, the impeller 3 is not in contact with the pump head 2 and the driving motor 14 when rotating, heat is not generated by friction easily, 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 ascends into the transfer cylinder 62 and drives the transfer cylinder 62 to rotate, the output rod 61 continuously ascends to drive the transfer cylinder 62 to ascend, the transfer 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 a mechanical movable vane, the impeller 3 can pump blood after the magnetic suspension or the magnetic coupling fails, the impeller 3 is prevented from rotating through the driving motor 14, the magnetic suspension or the magnetic coupling fails, the impeller 3 stops rotating to stop the impeller 3 from rotating, the risk of blood loss caused by unstable users is prevented, the safety of the pump is improved, when the driving motor 14 directly drives the impeller 3 to operate, the heat transmission rod 62 to normally, the heat transmission cylinder 62 can not be prevented from being separated from the heat transmission cylinder 62 when the blood pump 2 and the heat transmission cylinder 62, the blood pump 2 does not generated when the blood pump 2 rotates, and the heat transmission cylinder 62 rotates, and the heat transmission cylinder 62 can not be prevented from being transmitted in the blood pump.

Furthermore, a push plate is fixedly mounted on theoutput rod 61, when theoutput rod 61 rises into thedelivery cylinder 62, the push plate abuts against the bottom of thedelivery cylinder 62, and thedelivery cylinder 62 is driven to rise by the push plate when theoutput rod 61 continues to rise.

Further, a flow velocity sensor is arranged in the blood pump, the flow velocity sensor is in the prior art, after the blood pump is started, but the flow velocity in the blood pump is lower than a set value, thestandby driving assembly 6 is started, specifically, theoutput rod 61 is pushed to ascend, theoutput rod 61 ascends into thetransmission cylinder 62 and drives thetransmission cylinder 62 to ascend and be sleeved on the receivingrod 63, the drivingmotor 14 drives theoutput rod 61 to rotate, theoutput rod 61 drives thetransmission cylinder 62 to rotate, thetransmission cylinder 62 drives the receivingrod 63 to rotate, the receivingrod 63 drives theimpeller 3 to rotate, and the purpose that theimpeller 3 is directly driven by the drivingmotor 14 is achieved.

Further, because thedrive motor 14 directly drivesimpeller 3 and can produce the heat, still be provided with alarm device when the in-service use, after blood pump magnetic suspension or magnetic coupling became invalid, detect the interior velocity of flow reduction ofpump head 2 through velocity of flow sensor, alarm device sent out reputation alarm or long-range alarm this moment, remind people to overhaul, this is prior art, and for the conventional knowledge that personnel in this field mastered, because some blood pumps are portable and can't in time overhaul, the clinical blood pump also can't change in the short time and accomplish, and the human body stops having the danger of losing blood in the short time after supplying blood, and drivemotor 14 directly drivesimpeller 3 and rotates this moment, prevent that the blood pump from waiting to overhaul in-process or overhaul and change the in-process user and producing the risk of losing blood.

Further, the top center department ofpump head 2 is fixed the intercommunication has the feed liquor pipe, and the lateral wall ofpump head 2 is fixed the intercommunication has the drain pipe.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, thebackup driving assembly 6 further includes aclutch friction plate 64 and two fixedfriction plates 65, the fixedfriction plates 65 are driven by the drivingmotor 14 to rotate, and when theclutch friction plate 64 abuts against the fixedfriction plates 65, the fixedfriction plates 65 drive theoutput rod 61 to rotate through theclutch friction plate 64; theclutch friction plate 64 is arranged between the two fixedfriction plates 65; when theoutput rod 61 is lifted, theclutch plates 64 can be driven to move synchronously, theclutch plates 64 are separated from the corresponding fixedplates 65, the power of theoutput rod 61 is cut off, after theoutput rod 61 is lifted into thetransmission cylinder 62 and drives thetransmission cylinder 62 to lift for a specified distance, theclutch plates 64 are abutted against the other fixedplates 65, and the power of theoutput rod 61 is restored.

The two fixedfriction plates 65 are respectively arranged above and below theclutch friction plate 64, when theoutput rod 61 ascends, theclutch friction plate 64 is driven to move synchronously, theclutch friction plate 64 is disconnected with the fixedfriction plate 65 positioned below, the fixedfriction plate 65 cannot drive theclutch friction plate 64 to rotate, at the moment, theoutput rod 61 ascends into thetransmission cylinder 62 and drives thetransmission cylinder 62 to ascend, when thetransmission cylinder 62 ascends to be sleeved on the receivingrod 63, theclutch friction plate 64 abuts against the fixedfriction plate 65 positioned above, at the moment, the fixedfriction plate 65 drives theclutch friction plate 64 to rotate through friction force, theclutch friction plate 64 drives theoutput rod 61 to rotate, the power of theoutput rod 61 can be cut off in the meshing process of theoutput rod 61 and thetransmission cylinder 62 and the meshing process of thetransmission cylinder 62 and the receivingrod 63, and power connection is convenient.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the engaginggear 71 is fixedly mounted at the top of theoutput rod 61 and the bottom of the receivingrod 63, the engaginginner gear 72 is fixedly mounted at the inner wall of thetransmission cylinder 62 near both ends, and the teeth at one end of theengaging gear 71 opposite to the engaginginner gear 72 are arranged in a gradually shrinking manner.

Theoutput rod 61 ascends to drive thecorresponding meshing gear 71 to ascend, so that themeshing gear 71 enters the meshinginner gear 72 and is meshed with the meshinginner gear 72, theoutput rod 61 rotates to drive theoutput rod 61 to continuously ascend to drive thetransmission cylinder 62 to ascend, thetransmission cylinder 62 is sleeved on the receivingrod 63, the meshinginner gear 72 in thetransmission cylinder 62 is meshed with themeshing gear 71 arranged on the receivingrod 63, the receivingrod 63 is driven to rotate when thetransmission cylinder 62 rotates, and the opposite ends of themeshing gear 71 and the meshinginner gear 72 are arranged in a shrinkage mode, so that themeshing gear 71 and the meshinginner gear 72 cannot be blocked when being meshed.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 is installed at an output end of the drivingmotor 14, anelectromagnetic push rod 81 is fixedly installed on the magnetic coupling assembly 5, theclutch friction plate 64 is rotatably connected to theelectromagnetic push rod 81, a rotatingcylinder 82 is fixedly installed on the magnetic coupling assembly 5, the fixedfriction plate 65 is fixedly installed on an inner wall of therotating cylinder 82, theoutput rod 61 is fixedly installed on theclutch friction plate 64, a down-pressingspring 83 is fixedly installed on theclutch friction plate 64, acover plate 84 is rotatably connected to the top of therotating cylinder 82, the other end of the down-pressingspring 83 is fixedly installed on thecover plate 84, themeshing gear 71 is fixedly installed on the top of theoutput rod 61, and through holes are formed in centers of thecover plate 84 and the fixedfriction plate 65.

The drivingmotor 14 drives therotating cylinder 82 to rotate, the rotatingcylinder 82 drives the fixedfriction plate 65 to rotate, theelectromagnetic push rod 81 can push theclutch friction plate 64 and theoutput rod 61 to ascend when being powered on, theclutch friction plate 64 ascends to drive thepressing spring 83 to store power, theelectromagnetic push rod 81 supplies power through a conductive slip ring in the prior art, the conductive slip ring is in the prior art, and not described in detail herein, so that theelectromagnetic push rod 81 can also guarantee power supply when rotating, and when theelectromagnetic push rod 81 is powered off, thepressing spring 83 resets to push theclutch friction plate 64 to descend.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, a sealingcylinder 91 is fixedly communicated with the bottom of thepump head 2, the bottom of the sealingcylinder 91 is provided with an opening, a sealingring 92 is rotatably connected to thetransfer cylinder 62, and the sealingring 92 is slidably fitted in the sealingcylinder 91 and sealed with the sealingcylinder 91; aretainer ring 93 is fixedly mounted on the inner wall of the top of the sealingcylinder 91, areturn spring 94 is fixedly mounted on the sealingring 92, and the other end of thereturn spring 94 is fixedly mounted on theretainer ring 93.

Thetransfer cylinder 62 is moved in the sealingcylinder 91, the sealingcylinder 91 does not cause leakage of thepump head 2, the sealing performance is better, thetransfer cylinder 62 rises to compress thereturn spring 94, and when theoutput rod 61 descends, thereturn spring 94 resets to push thetransfer cylinder 62 to descend.

Further, a resisting block is fixedly installed at the bottom of the sealingcylinder 91, and when thetransfer cylinder 62 descends to the bottom of the sealingcylinder 91, the resisting block resists against the bottom of thetransfer cylinder 62 to prevent thetransfer cylinder 62 from being separated from the sealingcylinder 91.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 includes a plurality ofactive magnets 51 and a plurality ofpassive magnets 52, the plurality ofactive magnets 51 are uniformly and fixedly mounted on the output end of the drivingmotor 14 in an annular shape, the plurality ofpassive magnets 52 are disposed on theimpeller 3, the plurality ofpassive magnets 52 correspond to theactive magnets 51, the magnetic poles of the adjacentpassive magnets 52 are opposite, and the magnetic poles of the adjacentactive magnets 51 are opposite.

When the output end of the drivingmotor 14 rotates, the drivingmagnets 51 are driven to rotate, the drivingmagnets 51 attract thepassive magnets 52 with the same magnetic pole, because the adjacentpassive magnets 52 have opposite magnetic poles, theadjacent driving magnets 51 have opposite magnetic poles, the drivingmagnets 51 drive thepassive magnets 52 to rotate when rotating, and when the drivingmagnets 51 and thepassive magnets 52 rotate relatively, the drivingmagnets 51 need to overcome the repulsive force of the adjacentpassive magnets 52, so that the drivingmagnets 51 and thepassive magnets 52 are ensured not to rotate relatively easily.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, the magnetic coupling assembly 5 further includes a wrappingsleeve 53, the wrappingsleeve 53 is fixedly mounted on the drivingmagnet 51, and therotary cylinder 82 and theelectromagnetic push rod 81 are both fixedly mounted on the wrappingsleeve 53.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, animpeller 10 is provided in thepump head 2, theimpeller 3 is provided with a plurality of impellers uniformly and fixedly mounted on theimpeller 3, aconical block 11 is fixedly mounted on theimpeller 10, a receivingrod 63 is fixedly mounted at the bottom of theconical block 11, theconical block 11 guides blood to the outer ring of thepump head 2, and the blood is introduced from the center of the top of thepump head 2 and discharged laterally under the centrifugal force generated when theimpeller 3 rotates.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, theretainer ring 93 is rotatably connected with aseparation preventing ring 12, the receivingrod 63 is disposed through theseparation preventing ring 12, the bottom of theimpeller 10 is fixedly mounted with a floatingshell 13, and thepassive magnet 52 is disposed in the floatingshell 13.

When thetransfer cylinder 62 is lifted up and sleeved on the receivingrod 63, theanti-falling ring 12 can abut against themeshing gear 71 on the receivingrod 63, and themeshing gear 71 and the receivingrod 63 are prevented from being lifted up synchronously under the pushing of thetransfer cylinder 62.

Further, a suspension assembly for suspending theimpeller 3 in thepump head 2 is provided in thesuspension housing 13 and thedrive base 1 together, which is the prior art, and specifically refers to the extracorporeal magnetic suspension blood pump disclosed in chinese patent application CN115040775 a.

Further, as another specific embodiment, the suspension assembly disposed in the suspension housing 13 at least includes a stator magnet and a rotor magnet, the stator magnet is a plurality of and is uniformly disposed in the driving base 1 in an annular shape, the rotor magnet is uniformly disposed in the suspension housing 13 in an annular shape, and the stator magnet is disposed on an outer ring of the rotor magnet, the stator magnet and the rotor magnet are disposed in opposite magnetic poles, so that opposite magnetic poles of one end of the stator magnet and the other end of the rotor magnet are the same, the stator magnet limits the rotor magnet through a repulsive force, so that the driving magnet 51 and the driven magnet 52 are coaxially disposed, and the impeller 3 is not easily displaced horizontally, the suspension assembly further includes a stator magnetic ring and a rotor magnetic ring, the stator magnetic ring is disposed in the driving base 1, the rotating magnetic ring is disposed in the suspension housing 13, the stator magnetic ring and the rotor magnetic ring are opposite magnetic poles, the rotor magnetic ring is disposed above the stator magnetic ring, and the stator magnetic ring repels the stator magnetic ring, so that the stator magnetic ring resists the gravity of the impeller 3 and the suspension housing 13, thereby suspending.

Further, referring to fig. 1, 4, 6, 10, 11 and 12, thepump head 2 is connected with the fixedassembly 4 with thedrive base 1, the fixedassembly 4 includes a lockingblock 41, a lockingseat 42, a locking groove, a blocking groove and a blockingblock 43, the lockingseat 42 is fixedly installed on thedrive base 1, the locking groove is opened on the lockingseat 42, the blocking groove is opened on the groove wall of the locking groove, the blockingblock 43 is in sliding fit in the blocking groove, the lockingblock 41 is fixedly installed on thepump head 2, the lockingblock 41 is pressed down into the locking groove, thepump head 2 is located on thedrive base 1, the movement of the blockingblock 43 in the blocking groove is pushed, the blockingblock 43 is moved to the upper side of the lockingblock 41, the lockingblock 41 is blocked in the locking groove, thepump head 2 can be locked, thepump head 2 is prevented from being separated from thedrive base 1 in the using process, and the operation is simple.

Furthermore, the locking groove is formed in the groove wall of the locking groove far away from the blocking groove, the groove wall of the locking groove is gradually contracted, and when the blockingblock 43 moves into the locking groove, the locking groove and the blockingblock 43 are in interference fit, so that the blockingblock 43 is not easy to separate after entering 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 pole, because the adjacent driven magnets 52 have opposite magnetic poles and the adjacent driving magnets 51 have opposite magnetic poles, the driving magnets 51 rotate to drive the driven magnets 52, 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, so as to ensure that the driving magnets 51 and the driven magnets 52 are not easy 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 impeller 3 rotates to pump blood in the pump head 2, because the impeller 3 is magnetically suspended in the pump head 2, the impeller 3 is also driven to rotate by magnetic coupling, when the impeller 3 fails in magnetic suspension or magnetic coupling, blood cannot be pumped out in the pump head 2, the driving motor 14 drives the output rod 61 to rotate when rotating, 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 cannot drive the clutch friction plate 64 to rotate, the output rod 61 rises to drive the corresponding meshing gear 71 to rise, so that the meshing gear 71 enters the meshing inner gear 72 to be meshed with the meshing inner gear 72, the output rod 61 rotates to drive the output rod 61 to continue to rise to drive the transmission cylinder 62 to rise, the transmission cylinder 62 is sleeved on the receiving rod 63, the meshing inner gear 72 in the transmission cylinder 62 is meshed with the meshing gear 71 arranged on the receiving rod 63, so that the receiving rod 63 is driven to rotate by the transmission cylinder 62, the clutch friction plate 64 abuts against a fixed friction plate 65 located 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 transfer 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, so that the impeller 3 is driven to rotate through a mechanical driving belt to pump blood, after magnetic suspension or magnetic coupling fails, the impeller 3 is directly driven to rotate through the driving motor 14, after the magnetic suspension or magnetic coupling fails, the phenomenon that the impeller 3 stops rotating to stop pumping blood is prevented, the blood loss risk of a user caused by instability of the blood pump is prevented, the safety of the blood pump is improved, when the driving motor 14 drives the impeller 3 to rotate through the magnetic coupling, namely when the blood pump normally operates, the output rod 61 is separated from the transfer cylinder 62, the output rod 61 cannot drive the transfer cylinder 62 to rotate, the output rod 61 cannot transfer heat to the transfer cylinder 62 to rotate, the receiving rod 63 also separates from the transfer cylinder 62 when rotating, the transfer cylinder 62 cannot drive the transfer the rotation of the impeller 3 and the heat in the pump head 2, and the heat generation amount in the pump head is ensured to be high when the normal operation because of the heat generation amount is ensured.

Finally, it should be noted that: 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 or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. A magnetic suspension blood pump with a standby driving structure is characterized by comprising a driving base (1) and a pump head (2), wherein an impeller (3) is arranged in the pump head (2), the driving base (1) can enable the impeller (3) to be suspended in the pump head (2), a driving motor (14) is arranged in the driving base (1), the driving motor (14) and the impeller (3) are jointly 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);

still include reserve drive assembly (6), reserve drive assembly (6) include output rod (61), a transmission section of thick bamboo (62) and accept pole (63), accept pole (63) with impeller (3) are connected, driving motor (14) with output rod (61) drive is connected, output rod (61) can rise the entering in a transmission section of thick bamboo (62) and drive a transmission section of thick bamboo (62) and rotate, output rod (61) get into after a transmission section of thick bamboo (62) and continue to rise, a transmission section of thick bamboo (62) rise the cover and establish accept on pole (63) and drive accept pole (63) and rotate, so that it can drive to accept pole (63) impeller (3) are rotated.

2. A magnetic levitation blood pump with a back-up drive configuration as claimed in claim 1, wherein: 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 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 through the clutch friction plate (64); the clutch friction plate (64) is arranged between the two fixed friction plates (65); when the output rod (61) rises, the clutch friction plate (64) can be driven to move synchronously, 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.

3. A magnetic levitation blood pump with a back-up drive configuration as claimed in claim 2, wherein: meshing gears (71) are fixedly mounted at the top of the output rod (61) and the bottom of the receiving rod (63), meshing inner gear rings (72) are fixedly mounted at positions, close to two ends, of the inner wall of the transmission cylinder (62), and teeth at one end, opposite to the meshing inner gear rings (72), of the meshing gears (71) are arranged in a gradually-shrinking mode.

4. A magnetically levitated blood pump with a back-up drive configuration as claimed in claim 3, wherein: the clutch mechanism is characterized in that the magnetic coupling assembly (5) is installed at the output end of the driving motor (14), an electromagnetic push rod (81) is fixedly installed on the magnetic coupling assembly (5), a clutch friction plate (64) is connected to the electromagnetic push rod (81) in a rotating mode, a rotating cylinder (82) is fixedly installed on the magnetic coupling assembly (5), a fixed friction plate (65) is fixedly installed on the inner wall of the rotating cylinder (82), an output rod (61) is fixedly installed on the clutch friction plate (64), a pressing spring (83) is fixedly installed on the clutch friction plate (64), a cover plate (84) is connected to the top of the rotating cylinder (82) in a rotating mode, the other end of the pressing spring (83) is fixedly installed on the cover plate (84), the meshing gear (71) is fixedly installed on the top of the output rod (61), and through holes are formed in the center positions of the cover plate (84) and the fixed friction plate (65).

5. A magnetically levitated blood pump with a back-up drive configuration as set forth in claim 4, 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 rotatably connected to the transfer 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 check ring (93) is fixedly mounted on the inner wall of the top of the sealing cylinder (91), a return spring (94) is fixedly mounted on the sealing ring (92), and the other end of the return spring (94) is fixedly mounted on the check ring (93).

6. The magnetic levitation blood pump with a standby drive structure as recited in claim 5, wherein: the magnetic coupling assembly (5) comprises a plurality of driving magnets (51) and a plurality of driven magnets (52), the driving magnets (51) are uniformly and fixedly installed at the output end of the driving motor (14) in an annular shape, the driven magnets (52) are arranged on the blade (3), the driven magnets (52) correspond to the driving magnets (51), the magnetic poles of the adjacent driven magnets (52) are opposite, and the magnetic poles of the adjacent driving magnets (51) are opposite.

7. A magnetically levitated blood pump with a back-up drive configuration as claimed in claim 6, 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 both fixedly installed on the wrapping sleeve (53).

8. A magnetically levitated blood pump with a back-up drive configuration as claimed in claim 6, wherein: be provided with impeller (10) in pump head (2), blade (3) are provided with a plurality of and even fixed mounting be in on blade (3), fixed mounting has conical block (11) on impeller (10), accept pole (63) fixed mounting be in the bottom of conical block (11).

9. A magnetic levitation blood pump with a back-up drive configuration as claimed in claim 8, wherein: the anti-dropping ring (12) is rotatably connected to the retainer ring (93), the receiving rod (63) penetrates through the anti-dropping ring (12), the suspension shell (13) is fixedly mounted at the bottom of the impeller (10), and the passive magnet (52) is arranged in the suspension shell (13).

10. A magnetic levitation blood pump with a back-up drive configuration as claimed in claim 1, wherein: 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, block the groove and block piece (43), and locking seat (42) fixed mounting is in on the drive base (1), the locking groove is seted up on locking seat (42), blocks the groove and sets up on the cell wall of locking groove, block piece (43) sliding fit at blocking the inslot, locking piece (41) fixed mounting be in on pump head (2).

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