80 results about "Centrifugal blood pump" patented technology

A centrifugal blood pump includes a housing that defines an inlet passage, a chamber, and an outlet passage. The pump includes an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage and magnetic members embedded in the impeller such that the impeller and the magnetic members rotate together within the chamber. The pump includes a motor to control movement of the impeller in the chamber. The motor is adjacent the chamber and separated from the chamber by a partition member. The pump includes an inner annular magnetic member and an outer annular magnetic member embedded in a side of the housing opposite the partition member. A first net magnetic force between the inner annular magnetic member and the magnetic members exhibits greater attraction than a second net magnetic force between the outer annular member and the magnetic members.

The invention belongs to the field of medical apparatuses, and relates to an artificial heart assisting device for treating heart failure caused by acute cardiogenic shock, in particular to an in-vitro non-implantable maglev heart chamber assisting centrifugal blood pump. The in-vitro non-implantable maglev heart chamber assisting centrifugal blood pump adopts a non-bearing magnetic fluid levitation technology to substitute mechanical bearing driving of the conventional centrifugal blood pump, an impeller rotor is suspended in a magnetic field without any mechanical contact, and the position and the speed of the impeller rotor are precisely regulated by a digital signal processor system, so that damage to blood cells and visible components (platelets, blood coagulation factors and the like) of blood is reduced to the most extent; meanwhile, by a heparin coating technology applicable to the inner wall of the blood pump and the surface of the impeller rotor, coagulation and thrombosis as well as use of an anticoagulant medicine in the assisting process are further reduced, so that complications of hemorrhage of a patient during a surgery are reduced. The in-vitro non-implantable maglev heart chamber assisting centrifugal blood pump has the characteristics of being simple in structure, reliable in operation, convenient to maintain, stepless in speed regulation and the like, can be used for treating the heart failure caused by acute cardiogenic shock triggered by a variety of reasons, and in combination with an oxygenator, can also be used for assisting circulation and blood oxygenation during extracorporeal membrane oxygenation (ECMO) treatment.

Extracorporeal circuit devices can be used for on-pump open-heart surgery to support surgical procedures such as coronary artery bypass grafting. In some cases, a centrifugal pump is used as part of an extracorporeal circuit. Centrifugal pump heads are described herein that induce flow on two sides of an impeller plate, and that can be conveniently mechanically assembled.

A centrifugal pump includes a system that removes gas that accumulates along the axis of rotation of the shaft and/or impeller of the pump. One or more vent inlets are placed in the region where the gas accumulates and a suction device draws the accumulated gas through the vent inlets and a vent out of the centrifugal blood pump.

The invention discloses a blood passive control suspension bearing applied to an implantable centrifugal blood pump, which is a novel blood pump supporting device, wherein annular permanent magnet steel is arranged on a rotor, an electromagnetic coil is fixed on a stator, the top and the bottom of the stator are provided with spiral grooves, an inner ring of the stator is provided with an arc-shaped groove, the upper top surface of the rotor is provided with an impeller which is arranged in a pump shell, and the pump shell is connected with the stator and a base into an integral body; and blood flows in from the inlet of the pump shell, most of the blood flows out from the outlet of the pump shell through the rotation of the impeller, and a small amount of the blood passes through a circular hole in the center of the rotor, a gap between the lower surface of the rotor and the base, the spiral groove at the bottom of the stator, a gap between the rotor and the stator and the spiral groove on the top of the stator which form a secondary flow passage, and then converges with the blood at the outlet. The blood passive control suspension bearing has a simple structure, can ensure less bearing wear, small heat productivity and small power consumption, and is advantageous for the blood pump to be developed towards a light and portable direction.

The invention provides a single-fulcrum magnetomotive centrifugal blood pump, which is characterized in that a pump body and a driving device are arranged in a blood pump, wherein the pump body comprises a top cap, a base, an impeller and outer magnetic steel; at least three layers of bosses are arranged on the base; a groove is arranged in the boss at the top end; a rolling ball is placed in the groove; a patchhole is arranged at the center of the bottom of the base; vanes and an annular joint are arranged on the impeller; connecting rods are arranged in the inner circle of the annular joint and gathered around the center of the inner circle of the annular joint; a circular arc central groove is formed at the bottom of the gathering position of connecting rod, and is matched with the rolling ball in the groove in the boss to form a single-fulcrum bearing; the outer magnetic steel is arranged inside the vanes; the driving device comprises a transmission shaft and a driving motor provided with a motor rotor; the motor rotor is sleeved with the transmission shaft; the transmission shaft is inserted into the patchhole; and inner magnetic steel is arranged inside the transmission shaft. The blood pump provided by the invention has the advantages that the incidence rate of thrombus and hemolysis can be effectively reduced as the pre-filling quantity is less; the structure is simple and stable; the mounting is convenient; and the cost is low.

The invention discloses an in-vitro membrane lung oxygenation device and a control method thereof for controlling oxygenation blood supply. The in-vitro membrane lung oxygenation device is capable ofsimply and rapidly enabling an oxygenator, a centrifugal blood pump head, a micro-thrombus filter and the like to be connected to an intelligent control main machine of a system. The intelligent control main machine is integrated with a temperature variable water tank. The temperature variable water tank can be conveniently and rapidly detached and combined. The device can be carried with a body,and provide a portable life support device. The intelligent control main machine is integrated with Big Dipper positioning and global system data transmission functions. A current geographic positionof the device and operating data of the device can be remotely monitored at any time. The in-vitro membrane lung oxygenation device is capable of combining a membrane lung oxygenator controller and the temperature variable water tank together to form a detachable combined body, greatly reducing cost, a volume and a weight of the system. Portability, integration, operation convenience and intelligence of the device are improved.

A centrifugal blood pump with stable rotation, which includes a housing and an impeller installed in the housing. The housing is facing the center of the impeller with a positioning shaft matched with the center hole of the impeller; the impeller is installed on the upper cover and the lower cover The center of the spiral blood channel between; the upper cover and the lower cover are respectively provided with a blood inflow tube and a blood outflow tube communicating with the blood channel; the blades in the impeller include the main blade and the auxiliary blade connected to the outer end of the main blade; The main blades are evenly arranged along the circumference of the rotor, and the included angle between the main blades and the rotational flow direction of blood in the blood channel is an obtuse angle. The invention optimizes the design of the impeller and related structural design, so that the centrifugal blood pump has higher pumping efficiency at low speed, ensures blood arterial pressure, reduces wear at low speed, prolongs the life of the blood pump, and also reduces energy consumption. Low power consumption improves the battery life of the blood pump, and the low speed also reduces the difficulty of blood pump working pressure control, making it easier to use and operate.

The invention discloses a miniature centrifugal blood pump capable of preventing hemocyte damage and a circular blood supply method of the miniature centrifugal blood pump, for solving the problems that in the prior art, the boundary layer thickness, secondary flow and vortex noise in the miniature centrifugal blood pump can not be well controlled. Two suction surface concave point groups distributed at an interval along the blade molded line are arranged the front edge of a blade suction surface of an impeller, and three pressure surface concave point groups distributed at intervals along the blade molded line are arranged at the front edge of a blade pressure surface; for a front hub, a front hub small wing is arranged at the outlet end of a blade channel of an impeller, and for a rear hub, two rear hub small wings are arranged at the outlet end of a blade channel of an impeller. The two suction surface concave point groups and the three pressure surface concave point groups cause the change of the local boundary layer, so that the blood with large viscosity can be separated from the surface of the blades, and the thickness of the boundary layer is reduced; the front hub small wing and the two rear hub small wings control the radial flow of liquid, and thus the jet flow wake loss and vortex noise are reduced.

The invention discloses an assembly production line of a centrifugal blood pump rotor, and belongs to the technical field of assembling equipment. The assembly production line of the centrifugal bloodpump rotor involves a conveyor belt, a bearing magnetic stack press-fitting mechanism, a motor magnet installing mechanism and a base welding mechanism, wherein a plurality of limiting assemblies arearranged on the conveyor belt, the motor magnet installing mechanism comprises a sliding plate, a workbench, a material pushing assembly, a lifting assembly, a clamping assembly and a bearing frame,the clamping assembly comprises an installing plate, a four-jaw air cylinder and a limiting column arranged at the bottom of the installing plate, limiting plates are installed at the bottoms of clamping jaws of the four-jaw air cylinder, arc-shaped grooves are formed in the limiting plates, and four bearing rods are arranged between the installing plate and the sliding plate. According to the assembly production line, the bearing magnetic stack press fitting, the motor magnet installing and the base welding steps of the centrifugal blood pump rotor can be automatically completed, four motor magnets can be simultaneously installed in an impeller by the motor magnet installing mechanism, and a worker does not need to install the motor magnets one by one.

A centrifugal pump system for a cardiac assist device employs a disc-shaped impeller having an outer circumference adapted to be rotatably driven in a pumping direction. A pump housing has a pumping chamber receiving the impeller, wherein the pumping chamber defines an outlet volute having a separation edge spaced from the outer circumference to provide a limited backflow path coinciding with the pumping direction. A motor drives the impeller in response to a voltage provided to the motor. A current sensor measures current flow within the motor in response to the voltage. A controller estimates a pump flow rate in response to a predetermined relation between the measured current and the pump flow rate, wherein the predetermined relation includes a positive slope from a predetermined backflow rate to a zero pump flow rate.

The present invention provides an in vitro magnetic suspension centrifugal blood pump with a central magnetic pole structure, wherein a pump head comprises an impeller and a pump shell, a lower bottomplate of a cylindrical cavity at a lower part of the pump shell is recessed into a central cylindrical shell, and a central tube cavity is formed corresponding to a lower bottom plate outside of thepump shell; blades in the impeller are fixedly arranged on a base seat, the base seat is a cylindrical shell body and a tube section is arranged in the cylindrical shell body, and permanent magnets are fixedly arranged in annular cavities between the tube section and the shell body; the impeller sleeves on a central column shell; a section of a W-shaped secondary flow channel is arranged between the impeller base seat and the pump shell cylindrical cavity, and between the tube section and the central cylindrical shell; and a magnetic suspension device is arranged below the pump shell, stator soft iron in a magnetic suspension element comprises a central cylindrical soft iron and the pump shell central tube cavity is inserted into the central cylindrical soft iron to form a central magneticpole. The centrifugal blood pump can reduce thrombus and hemolysis and improve pump stability and operating efficiency.

The invention discloses a mixed type passive suspended centrifugal blood pump. A shell cavity body consists of a positively cylindrical cavity and an inversely cylindrical cavity, wherein the positively cylindrical conical surface is embedded with a suspended permanently magnetic ring, and the inversely cylindrical conical surface is embedded with an electromagnetic coil; an inverse cone-shaped circular ring at the lower end of a rotor is embedded with a driving permanently magnetic ring, an upper part and a lower part of an outer surface of the inverse cone-shaped circular ring are provided with a spiral flow guiding groove respectively, and an inner surface of the inverse cone-shaped circular ring is provided with two inverse cone-shaped spiral guiding blades at equal intervals along the circumferential direction; and the upper end of the rotor is provided with cone-shaped circular ring segments at equal intervals along the circumferential direction, and each cone-shaped circular ring segment is embedded with a suspended permanently magnetic plate. When the blood pump works, the blood flows in from an entrance, and flows to an exit through the spiral guiding blades and the central holes of the spiral guiding blades, and a small part of blood at the exist flows through a gap between the rotor and the inner surface of the shell and the space between the cone-shaped circular ring segments and joins the blood at the entrance under the action of the pressure difference between the entrance and the exit and the upward spiral flow guiding groove and the down ward spiral flow guiding groove on the outer surface of the rotor. The blood pump has the advantages of less abrasion, less heat production and lower energy consumption.

The invention discloses an automatic assembling process for a centrifugal blood pump rotor and belongs to the technical field of assembling equipment. The automatic assembling process comprises a conveyor belt, a bearing magnetic pile press-fitting mechanism, a motor magnet mounting mechanism and a base mounting mechanism. A plurality of limiting assemblies are arranged on the conveyor belt. The motor magnet mounting mechanism comprises a sliding plate, a worktable, a pushing assembly, a lifting assembly, a clamping assembly and a bearing frame. The clamping assembly comprises a mounting plate, a four-jaw air cylinder and a limiting column arranged at the bottom of the mounting plate. A limiting plate is mounted at the bottom of each clamping jaw of the four-jaw air cylinder. An arc-shapedgroove is formed in the limiting plate. Four bearing rods are arranged between the mounting plate and the sliding plate. According to the automatic assembling process, steps of press-fitting bearingmagnetic piles, mounting motor magnets and a base for the centrifugal blood pump rotor can be finished automatically. Four motor magnets can be mounted in an impeller simultaneously by the motor magnet mounting mechanism, and it is not needed to mount the motor magnets one by one by a worker.

The invention discloses a micro-miniature centrifugal blood pump provided with self-adjusting blades, aiming at solving the problems in the prior art that boundary layer thickness, secondary flow and eddy noise in a micro-blood centrifugal pump cannot be well controlled. According to the micro-miniature centrifugal blood pump, a small wing is arranged on the force suction surface of each primary blade of a primary impeller; each secondary blade is fixed to a swinging blade by virtue of a cylindrical rod, and transmission pairs are defined by the cylindrical rods and a front end cover; an arc-shaped gear rack is arranged at the inner side of a driving ring; a gear at the output end of a control box is meshed with the arc-shaped gear rack; the ends, hinged with the driving ring, of various connecting rods are uniformly distributed in a circumferential direction of the driving ring; and in a direction from front edges to tail edges of swinging blades, division points, which serve as hinging ends of the swinging blades with the corresponding rods, are arranged on profile lines of the various swinging blades in accordance with corresponding sectional area ratios of the cylindrical rods at corresponding locations. According to the micro-miniature centrifugal blood pump provided by the invention, the secondary blades are different in attack angle, so that a requirement on adjusting blade mounting angles under conditions of different flow parameters such as different blood rates on different volute cross sections and the like can be satisfied.

The invention discloses a centrifugal blood pump driven by magnetic coupling, which is mainly used at occasions requiring in-vitro blood circulation such as in-vitro circulation assistance in a cardiac surgery and in-vitro membrane oxygenation. The centrifugal blood pump driven by the magnetic coupling is constituted of a centrifugal pump upper cover, a rotor, an internal drive magnet and a centrifugal pump lower cover. The centrifugal pump adopts a magnetic coupling drive manner to separate the centrifugal pump from driving, so that whole sealing of a blood circulation loop is realized, blood pollution is reduced, and disassembly and replacement become convenient. Streamlined design is adopted to rotor blades of the centrifugal blood pump and satisfies fluid dynamics requirements in the blood pump, so that blood can be flown out from a pump body stably and thrombosis is reduced. The centrifugal pump rotor is connected to the centrifugal pump lower cover through single-point spherical supporting, so that contact friction is reduced, and damages caused by friction-based heat generation to the blood are reduced.