WO2014019274A1 - Single-fulcrum magnetomotive centrifugal blood pump - Google Patents

Single-fulcrum magnetomotive centrifugal blood pump Download PDF

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Publication number
WO2014019274A1
WO2014019274A1 PCT/CN2012/081203 CN2012081203W WO2014019274A1 WO 2014019274 A1 WO2014019274 A1 WO 2014019274A1 CN 2012081203 W CN2012081203 W CN 2012081203W WO 2014019274 A1 WO2014019274 A1 WO 2014019274A1
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WO
WIPO (PCT)
Prior art keywords
blood pump
provided
pump
magnet
magnetomotive force
Prior art date
Application number
PCT/CN2012/081203
Other languages
French (fr)
Chinese (zh)
Inventor
王伟
韩露
俞晓青
丁文祥
杨明
张海波
Original Assignee
上海交通大学医学院附属上海儿童医学中心
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN 201210274047 priority Critical patent/CN103191476B/en
Priority to CN201210274047.8 priority
Application filed by 上海交通大学医学院附属上海儿童医学中心 filed Critical 上海交通大学医学院附属上海儿童医学中心
Publication of WO2014019274A1 publication Critical patent/WO2014019274A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/04Shafts or bearings, or assemblies thereof
    • F04D29/046Bearings
    • F04D29/047Bearings hydrostatic; hydrodynamic
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • A61M1/1013Types of bearings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1029Drive systems therefor
    • A61M1/1031Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1029Drive systems therefor
    • A61M1/1031Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped
    • A61M1/1036Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped using rotating magnets for driving
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606Canned motor pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • A61M1/1013Types of bearings
    • A61M1/1015Magnetic bearings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • A61M1/1013Types of bearings
    • A61M1/1017Hydrodynamic bearings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/12Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps implantable into the body
    • A61M1/122Heart assist devices, i.e. for assisting an ailing heart, using additional pumping means in the blood circuit

Abstract

A single-fulcrum magnetomotive centrifugal blood pump is provided with a pump body and a driving device. The pump body comprises a top cap (1), a base (2), an impeller (3) and outer magnetic steel (305); the base (2) is provided with at least three layers of bosses (201, 202, 203); the boss (201) at the top end is provided with a groove (204); a rolling ball (205) is placed in the groove (204); a patchhole (206) is arranged at the center of the bottom of the base (2); vanes (301) and an annular joint (302) are arranged on the impeller (3); connecting rods (303) are arranged in the inner circle of the annular joint (302) and gathered around the center of the inner circle of the annular joint (302); a circular arc central groove (304) is formed at the bottom of the gathering position of the connecting rods, and is matched with the rolling ball (205) in the groove (204) in the boss to form a single-fulcrum bearing; the outer magnetic steel (305) is arranged inside the vanes (301); the driving device comprises a transmission shaft (5) and a driving motor (4) provided with a motor rotor (401); the motor rotor (401) is sleeved with the transmission shaft (5); the transmission shaft (5) is inserted into the patchhole (206); and inner magnetic steel (501) is arranged inside the transmission shaft (5). The blood pump can effectively reduce the incidence rate of thrombus and hemolysis as the pre-filling quantity is less; the structure is simple and stable; the mounting is convenient; and the cost is low.

Description

A single-pivot magnetomotive force of the centrifugal blood pump

FIELD

Technical Field The present invention relates to medical devices, in particular, it is a single pivot magnetomotive force of the centrifugal blood pump.

Background technique

Cardiovascular and cerebrovascular diseases in developed countries has long been among the leading cause of human death, accounting for about 46% of the mortality rate, the number of US statistics show that each year about 350,000 cases of cardiac surgery. At present, the number of open-heart surgery every year about 10 million units, with the rapid economic development and continuous improvement of medical standards, the number of domestic heart surgery will have a growing process. According to statistics, there are some patients after cardiac surgery (0.6-2%) due to severe cardiac dysfunction, the body can not maintain the minimum requirements even in the drug support. These patients had to use temporary circulatory support device supports heart function to sustain life, waiting for the recovery of heart function. Patients also need to use some of the long-term circulatory assist device replacement heart function. In addition, treatment of chronic irreversible most effective way heart failure is heart transplantation, but the lack of donor hearts restrictions heart transplantation therapy in new therapies widely used in clinical, genetic engineering, cell engineering is not yet large-scale undertaken in the foreseeable future. Therefore, in many cases ventricular assist technology has become the only option.

Blood pump (also known as the heart pumps) cycle is the core of the heart assist device, in recent years, developed countries have been the focus of secondary research cycle, and has made some progress.

The first generation of the first blood pump is modeled beating heart pump developed, such the blood pump is pneumatic or electric compression pump chamber, the pump chamber by changing a stroke volume of blood. The second generation of continuous flow blood pump impeller rise early in the last century, such a blood pump vanes mounted on the bearing by a mechanical blood pump rotor, the rotor blades to rotate and thus drive the 1980s promoting blood or axially spiral radial forward motion . In the third generation of the blood pump technology is characterized by the suspension, so any magnetic levitation and / or liquid suspension technology research and development is called the third generation of the blood pump the blood pump.

Usually the blood pump having a third-generation suspension and two drive systems: a suspension system suspending the impeller, the impeller directly embedded permanent magnet or permanent magnets in the shaping of the impeller. Blood pump into the pump housing or stator electromagnetic coil or a permanent magnet, magnetized by the impeller axial and radial magnetic interaction between the stator or pump casing, the impeller was suspended in the middle of the pump housing; driving system driving the impeller to rotate. The stator or pump housing into another set of electromagnetic coils, a magnetic force generated by rotation of the impeller driven by a change in the magnetization of the solenoid current.

The third generation of the blood pump has three stages: the first stage is separated from the suspension and drive system of a motor indirectly drives the impeller outer phase. The blood pump suspension technology is simple, the suspension system and the drive system separated from the blood pump with external motor drive technology, the impeller is driven by a separate outboard motor; outer blades outboard motor rotatably connected magnetization by mechanical bearings, the impeller by magnetic force another suspension of the driving wheel rotational magnetization; the impeller is the main driving section, its rotation may push the blood flow. The second stage is a suspension and drive system of the motor directly drives the impeller separation stage, using the blood pump motor directly drives the impeller levitation. The suspension system and the drive system are separate, but the motor impeller outer canceled, suspended directly as an impeller rotor of the motor, the motor driving the suspended magnetically change the impeller rotates to promote blood flow directly. Pump remains a need for a separate additional magnetic suspension system to suspend the blood pump impeller. The third stage is the fusion stage the suspension and drive systems, i.e., the blood pump drive system integrate with the suspension, the blood pump is designed to drive the solenoid and the suspension system consisting of a fusion of the stator, a stator with a function also serves to drive the wheel suspension, Therefore, more compact pump design, which represents the blood pump is Ventr Assist.

The third generation of centrifugal blood pump designed to most, a small number of axial flow pump, a representative of the third generation are several blood pumps, for example: (1) Berlin Heart Incor pump: Berlin Heart company developed by magnetic levitation axial pump , the blood pump is made of a titanium alloy, the only movement of the impeller designed to pump body Archimedean spiral, through the impeller axial and radial magnetic floating in the pump housing, by varying the electromagnetic field, the driving wheel suspension of axial rotation, thus promoting blood flow forward; (2) HeartWare pump: the pump impeller levitation by the liquid leaves the pump levitation suspension, total stator combination of two pumps independent from coils, during operation of two coils can be simultaneously work, can work separately; (3) VentrAssist pump: pumps are in contact with the blood portion of pyrolytic carbon coating can reduce the incidence of thrombosis, but the longer the pump inflow, therefore, still in the post-implantation rectus abdominis rectus sheath or pouches made after pump placement; (4) No VaCO rVAD pump: a special flow into the system, the pump and the pump body parallel to the inflow conduit design, a flat formed outer Like.

Thrombosis is the formation of platelet aggregation and deposition of the blood pump is generally occur in the low-speed region less affected by blood flow region galling and erosion of surfaces in contact with blood. It refers to high-speed or high hemolysis turbulence or mechanical motion generated by the destruction of erythrocytes in the blood, resulting hemoglobin dispersion to the plasma, mainly caused by an irregular flow turbulence and high shear stress region. Hemolysis and thrombotic phenomena of great harm to patients, in clinical applications, due to cardiac circulatory support device thrombus and hemolysis can cause physiological disorder patients, and thus lead to complications in patients during surgery and after surgery, and even endanger the lives of patients, especially a greater impact on patients require long-term assisted circulation supported. Visible, reduce heart pump thrombus and hemolysis occurs in the secondary circulation system development problems to be solved.

The blood pump as compared to the third-generation and second-generation of the first blood pump, since the magnetic levitation technology, suspended in a blood pump impeller body, there is no friction and extrusion, hemolysis significantly reduced the incidence of thrombosis significantly reduced, while no bearing wear problems, improve the durability of the blood pump used, is more suitable for long-term circulatory assist.

The current third generation blood pump structure further complicated, and the large blood contact surface area prone to retention of blood, causing blood clots. In addition, the blood pump one-time items, should be simple in structure and low cost; for the infant and neonatal patients, should also minimize the priming volume of the blood pump. Currently on the more simple structure, can effectively reduce the incidence of thrombosis, pre-charge amount is small, low-flow, low-cost blood pump has not been reported.

SUMMARY

The present invention is directed to the prior art is insufficient, there is provided a single pivot magnetomotive force of the centrifugal blood pump.

To achieve the above object, the present invention takes the following technical solution: a single-pivot magnetomotive force of the centrifugal blood pump has a pump body and drive means, said pump body comprises a top cover, a base, and the impeller outside the magnet, the said base is provided with at least three bosses, the top boss is provided with a groove, the bottom center of the balls seated within said recess, said base is provided with an insertion hole; and said impeller is provided with an annular blade connection, the annular inner ring is connected with the connecting rod, said connecting rod to a collection central, arcuate central recess formed in the bottom of the central groove and the balls fit within the groove deck form a single pivot bearing; outer magnet provided on said inner blade; said drive means comprises a drive motor with a motor shaft and a rotor, said rotor shaft to the sleeve, and is inserted in the base of the inserted hole, the magnet is provided inside the drive shaft, the same number of said inner magnet and an outer magnet mounted on the positive, staggered adjacent poles;

Said outer cylinder or a rectangular parallelepiped magnet;

The inner magnet is cuboid or cylindrical;

Said base is provided with three projections;

The ball is spherical or hemispherical shape;

The ball is made of ceramic;

The blade is a straight blade or a curved rearward in the direction of the blood flow;

The number of blades is four or six;

The drive motor is provided outside the pump mounting means mounting said pump means is a recessed step.

Advantage of the present invention comprising:

1, a single pivot bearing as a rotary shaft, a contact area with the blood of the ball bearing is small, reducing the contact surface of the rotary shaft and the blood, thereby reducing the blood retention zone can effectively reduce the incidence of thrombosis;

2, according to the blood flow path outside the magnet and in the same cavity by the outer magnet disposed within the blade, the inner magnet disposed within the shaft, the magnet to solve the common problem of placing the cavity, while the present invention is simple to make blood pump structure, with the advantages of a low priming volume, it is suitable for children with congenital heart disease after surgery assisted circulation, but also can be used in cardiopulmonary bypass surgery;

3, the balls are spherical or semi-spherical, so that a single pivot bearing structure is more stable;

4, the base is provided with projections, it is possible to effectively reduce the amount of precharge;

5, the base is provided with insertion holes to facilitate mounting of the drive shaft;

6, the shape of the impeller along the direction of blood flow distal bent back, conform to the direction of blood flow, can effectively reduce the shear forces on red blood cells in the blood, reduces the chance of hemolysis;

7, small size, ease of surgical implants, while significantly reducing costs.

BRIEF DESCRIPTION

1 is a single pivot magnetomotive force of the centrifugal blood pump assembly of the present invention of FIG.

Figure 2 is a single pivot magnetomotive force of the centrifugal blood pump of the pump assembly of the present invention of FIG. Figure 3 is a plan view of FIG. 2.

Figure 4 is a magnetic power of the present invention, a single pivot centrifugal blood pump impeller second sensitive axis of the view.

Figure 5 is a bottom view of FIG.

Figure 6 is a magnetic power of the present invention, a single pivot centrifugal blood pump drive shaft second measurement view.

Figure 7 is a single pivot magnetomotive force of the centrifugal blood pump of the present invention is a further view of the sensitive axis of second impeller.

Figure 8 is a single pivot magnetomotive force of the centrifugal blood pump of the present invention is a further view of the drive shaft measured second device

detailed description

Drawings of embodiments of the present invention provides the following detailed description in conjunction.

And reference numerals relate to the components in the figures are as follows:

1. The top cover 101. inlet

103. 102. The outlet on the wall

2. 104. The outer wall of the base

Projection 201. The first projection of the first table top 2011.

2012. The first boss body 202. The second boss

203. The third boss 204. recess

206. 205. The ball insertion hole

3. The impeller blades 301.

303. 302. The annular connecting the connecting rod

305. 304. The central recess outside the magnet

3051. 306. engaging the top surface of the outer magnet

4. The driving motor 401. The motor rotor

The inner shaft 501. Magnet

6. The pump positioning means

Example 1

Referring to FIG. 1, FIG. 1 is a single pivot magnetomotive force of the present invention a centrifugal blood pump assembly of FIG. The single pivot magnetomotive force of the centrifugal blood pump has a pump body and a drive means, said pump body comprises a cap 1, 2, 3 and the outer magnets 305 of the impeller, said drive means includes a drive motor base 4, shaft 5 and the inner magnet 501.

Referring to FIG. 2, FIG. 2 is a magnetic power of the present invention, a single fulcrum centrifugal pump blood pump assembly of FIG. The top cover 1 is provided with an inlet 101, an outlet 102, upper wall 103 and outer wall 104. The cylindrical outer wall 104, a bottom end provided with an internal thread (not shown); said upper tapered wall 103, outer wall 104 is provided at the top; 103 located on a top wall of said central inlet 101 position; outlet 102 with the inlet 101 at a right angle from FIG. 3 (FIG. 3 is a plan view of FIG. 2) shows, the outflow port 102 along the tangential direction of the outer wall surface 104 disposed.

Referring again to FIG 2, the base 2 comprises a first boss 201 and second boss 202 and the third boss 203. The first stage 201 of the convex top portion of the first boss 2011 is tapered at its center provided with a groove 204, balls 205 positioned within the recess 204, the ball 205 is hemispherical, the a first projection of the first boss body 201 of 2012 sets a hollow cylinder; the second boss 202 is a hollow cylinder, whose outer wall is provided with an external thread (not shown), the second boss 202 to the top with the first boss 201 is connected, is connected to the bottom end of the top table 203 of the third projection, the second projection stage 202 diameter larger than the diameter of the first boss body 2012; the third boss 203 is a hollow cylinder body, a diameter greater than the diameter of the second projection stage 202, while larger than the diameter of outer wall 104; the body 2012 first boss, the second boss 202 and the hollow interior of the third stage projection 203 is formed insertion hole 206, i.e., bottom of the base 2 is provided with insertion holes 206.

Referring to FIG. 4, FIG. 4 of the present invention is a single pivot magnetomotive force of the centrifugal blood pump impeller second sensitive axis of the view. The impeller 3 is provided with an annular connection 302, 302 is connected to the ring-shaped annular ring, the inner ring is provided with three connecting rod 303, connecting rod 303 of the three to the center of the impeller 3 together form a joint 306, the engaging portion 306 is an annular ring, the bottom center of the central recess 304, central recess 304 of the circular arc shape. The lower end of the annular connector 302 is provided with four blades 301, 301 of the array of four blades discharged from the annular connector 302 is connected as a whole, forming a semi-disk flow passage, the flow of blood along the distal end of the blade 3 bent rearward direction. The interior of the rear end of blade 301 is provided outside the magnet 305, the magnet 305 to the outer sheet structure. Referring to FIG. 5, FIG. 5 is a bottom view of FIG. 4, the top surface 3051 of the outer magnet has a rectangular shape, i.e., the outer magnet 305 is a rectangular parallelepiped.

Referring again to FIG 1, the drive means includes a drive motor 4 and drive shaft 5, the drive motor 4 is provided outside the pump mounting means 6, 6 of the pump body mounting means is a recessed step, an inner diameter an outer diameter equal to the third base station 203 of the projections 2; 4 the upper end of the driving motor 401 to the motor rotor. Referring to FIG. 6, FIG. 6 of the present invention is a single pivot magnetomotive force of the centrifugal blood pump drive shaft second measurement view. The drive shaft 5 on the outer rotor 401, the inner shaft 5 is placed inside the magnet 501, the magnet 501 in a sheet-like magnet is circular, the same number of magnet 305 with the outer.

Referring to FIG 1, when the present invention is a single pivot magnetomotive force of the centrifugal blood pump assembly is completed, the internal thread of the bottom end of the outer wall 104 (not shown) and a second externally threaded boss 202 (not shown) with , so that the top cover 2 and the base 1 are formed an internal cavity, the impeller 3 is located in the inner cavity, and fitted on top of the first boss 201, the balls within the central recess 304 and the recess 204 205 cooperate to form a single pivot bearing; coincides with the axis of the center of the impeller 3 and the first projection of the central axis stage 201, the rear end 301 of each blade 201 with the first boss spaced the same distance, and the first protrusion table 201 is parallel to the tangential direction; top surface of the outer magnet 305 of the outer magnets 3051 of the first central axis projection table 201 is parallel, and the first boss 201 perpendicular to the radial, the pedal located outside center of the top surface 3051 of the magnet; the same as the inner magnet and the outer magnet 501 and the number 305 positioned facing, adjacent poles staggered. The drive shaft 5 is inserted into the insertion hole 206 in the base 2, the diameter of the drive shaft 5 is smaller than the diameter of the insertion hole 206, the pump mounting means 6 jammed third boss 203, the entire pump fixed .

Example 2

Single Fulcrum magnetomotive force according to the present embodiment is a centrifugal blood pump is substantially the same as in Example 1, except that only: Please refer to FIG. 7, FIG. 7 is a single pivot magnetomotive force of the centrifugal blood pump of the present invention, a further second test impeller isometric view of the impeller 3 is provided with six blades 301, 301 of the blade is a straight blade.

Example 3

Single Fulcrum magnetomotive force of the centrifugal blood pump according to the present embodiment is substantially the same as in Example 1, except that only: Referring to FIG 8, FIG 8 is a single pivot magnetomotive force of the centrifugal blood pump of the present invention, a further second drive means measuring axial view, said inner magnet 501 is a circular sheet-shaped magnet. Corresponding to the outer magnet 305 (not shown) outside the magnet is circular top surface 3051, i.e., the outer sheet-like magnet 305 is cylindrical.

For the above Examples 1-3, it is noted that:

Said arcuate central recess 304 and the base 2042 of the hemispherical ball groove 205 cooperate to form a single pivot bearing, the hemispherical ball 205 functions as a radial and axial support of the impeller 3 is fixed the action of the impeller 3, a single pivot bearing which is simple in structure, can effectively reduce the contact area with the blood, thus reducing blood retention region, significantly reduced the incidence of thrombosis; the hemispherical ball 205 is designed to be so by the base 2 and the impeller 3 single pivot bearing constituting the overall structure more robust; ball 205 can be made of the material easy to wear, such as ceramic;

The outer magnet 305 disposed within the blade 301, the inner magnet 501 disposed as the driving magnet, the magnet solved when the driving magnet and the blood flow path at the same place within the drive shaft cavity 5 problems, while the structure of a single fulcrum so that the magnetomotive force of the centrifugal blood pump of the present invention is much simpler; the same number of magnets 305 and 501 within the outer magnet positioned facing, adjacent poles are staggered desynchronizer prevented when rotated; the thickness of the outer magnet 305 is l-2mm, preferably a rectangular parallelepiped shape; the thickness of the inner magnet 501 is l-2mm, preferably a rectangular parallelepiped shape;

The impeller blades 301 by the number 3 generally designed for an even number, but is not limited to four or six; from the central axis 3 from the rear end of the impeller blades 301 is 5-10mm, the length of the blade 301 <30mm; assembled when the rear end of the blade 301 and the gap width between the first stage 201 is a convex 0.5mm; 301 of the blade shape of the front end is preferably bent backwards in the direction of the blood flow, which can effectively reduce the blood erythrocytes shearing force, to prevent hemolysis.

Said central recess 304 is preferably semi-spherical shape; the number of the bosses of the base 2 is at least three, but is not limited to three, the design of the boss can be effectively reduced priming volume; the between the outer wall 104 is not limited to the second boss 201 and the threaded connection can be any connection, such as a closed plastic viscosity; outer diameter of the outer wall 104 is 40-60mm; 6 unevenness of the pump body with pin positioning means , which is a fixed action pump, the pump body to prevent rotation with the drive shaft 5, so that the member can be omitted. Single Fulcrum works magnetomotive force of the centrifugal blood pump of the present invention is that: rotor 401 rotates, drive shaft 5 rotates, the drive shaft 5 disposed inside the follower magnet 501 is rotated, which in turn drives the outer magnet 305 is rotated, opposite magnet inside the outer blade rotation drives the impeller to 301,305, the blood enters the chamber lid 1 and the base formed by the inlet 101, the connecting rod by a gap between the impeller 303 of the flow 3, the centrifugal action of the impeller 3 at , pumped out from the outlet 102. The single pivot magnetomotive force of the centrifugal blood pump having an advantage of low priming volume, the pre-charge can be achieved within 23ml, can effectively reduce the incidence of hemolysis and thrombosis, while the structural stability is simple, easy to install, and low cost.

Claims

Rights request
A single pivot magnetomotive force of the centrifugal blood pump has a pump body and drive means, wherein,
The pump body comprises a top cover, a base, and the impeller outside the magnet, said base is provided with at least three bosses, the top boss is provided with recesses, the balls seated in said recess, said base the bottom center of the insertion hole is provided; and the impeller is provided with blades connected to an annular inner ring with said annular connecting the connecting rod, said connecting rod to a collection central, circular arc-shaped bottom portion formed at the center grooves, the central groove and the balls in the groove mating projections constituting a single pivot bearing; said outer magnet provided inside the blade;
Said drive means comprises a drive motor with a motor shaft and a rotor, said rotor shaft to the sleeve, and is inserted into the insertion hole of the base, the inner shaft is provided within the magnet, the number of inner magnet and the outer magnet is on the same place, staggered adjacent poles.
SUPPORTING according to claim magnetomotive force of the centrifugal blood pump of claim 1 wherein said outer magnet is cuboid or cylindrical.
SUPPORTING according to claim magnetomotive force of the centrifugal blood pump of claim 1 wherein said rectangular parallelepiped or cylindrical inner magnet.
The single pivot magnetomotive force of the centrifugal blood pump according to claim 1 wherein said base is provided with three bosses.
The single pivot magnetomotive force of the centrifugal blood pump according to claim 1 wherein the ball is spherical or hemispherical.
The single pivot magnetomotive force of the centrifugal blood pump according to claim 1 wherein said ball is made of ceramic.
The single pivot magnetomotive force of the centrifugal blood pump according to claim 1 wherein said blade is a straight blade or a curved rearward in the direction of blood flow.
8. The single pivot magnetomotive force of the centrifugal blood pump according to claim 1 wherein the number of blades is four or six.
SUPPORTING according to claim magnetomotive force of the centrifugal blood pump of claim 1 wherein said drive motor is provided outside the pump mounting means mounting said pump means is a recessed step.
PCT/CN2012/081203 2012-08-03 2012-09-10 Single-fulcrum magnetomotive centrifugal blood pump WO2014019274A1 (en)

Priority Applications (2)

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US9308302B2 (en) 2013-03-15 2016-04-12 Thoratec Corporation Catheter pump assembly including a stator
US9327067B2 (en) 2012-05-14 2016-05-03 Thoratec Corporation Impeller for catheter pump
US9358329B2 (en) 2012-07-03 2016-06-07 Thoratec Corporation Catheter pump
US9364592B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9381288B2 (en) 2013-03-13 2016-07-05 Thoratec Corporation Fluid handling system
US9421311B2 (en) 2012-07-03 2016-08-23 Thoratec Corporation Motor assembly for catheter pump
US9446179B2 (en) 2012-05-14 2016-09-20 Thoratec Corporation Distal bearing support
US9675738B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Attachment mechanisms for motor of catheter pump
US9675740B2 (en) 2012-05-14 2017-06-13 Tc1 Llc Impeller for catheter pump
US9675739B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Motor assembly with heat exchanger for catheter pump
US9770543B2 (en) 2015-01-22 2017-09-26 Tc1 Llc Reduced rotational mass motor assembly for catheter pump
US9827356B2 (en) 2014-04-15 2017-11-28 Tc1 Llc Catheter pump with access ports
US9872947B2 (en) 2012-05-14 2018-01-23 Tc1 Llc Sheath system for catheter pump
US9907890B2 (en) 2015-04-16 2018-03-06 Tc1 Llc Catheter pump with positioning brace
US9962475B2 (en) 2011-01-06 2018-05-08 Tc1 Llc Percutaneous heart pump
US10029037B2 (en) 2014-04-15 2018-07-24 Tc1 Llc Sensors for catheter pumps
US10105475B2 (en) 2014-04-15 2018-10-23 Tc1 Llc Catheter pump introducer systems and methods
US10215187B2 (en) 2004-09-17 2019-02-26 Tc1 Llc Expandable impeller pump

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CN104373356B (en) * 2014-11-14 2017-07-21 中国科学院苏州生物医学工程技术研究所 Based on semi-maglev centrifugal ball medical
CN107115573A (en) * 2017-05-09 2017-09-01 李国荣 Single-fulcrum centrifugal pump heart assist device

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Cited By (26)

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US10215187B2 (en) 2004-09-17 2019-02-26 Tc1 Llc Expandable impeller pump
US9717833B2 (en) 2004-09-17 2017-08-01 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9364592B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9364593B2 (en) 2004-09-17 2016-06-14 The Penn State Research Foundation Heart assist device with expandable impeller pump
US10149932B2 (en) 2006-03-23 2018-12-11 The Penn State Research Foundation Heart assist device with expandable impeller pump
US9962475B2 (en) 2011-01-06 2018-05-08 Tc1 Llc Percutaneous heart pump
US9446179B2 (en) 2012-05-14 2016-09-20 Thoratec Corporation Distal bearing support
US9872947B2 (en) 2012-05-14 2018-01-23 Tc1 Llc Sheath system for catheter pump
US9675740B2 (en) 2012-05-14 2017-06-13 Tc1 Llc Impeller for catheter pump
US10117980B2 (en) 2012-05-14 2018-11-06 Tc1 Llc Distal bearing support
US9327067B2 (en) 2012-05-14 2016-05-03 Thoratec Corporation Impeller for catheter pump
US10039872B2 (en) 2012-05-14 2018-08-07 Tc1 Llc Impeller for catheter pump
US9421311B2 (en) 2012-07-03 2016-08-23 Thoratec Corporation Motor assembly for catheter pump
US9358329B2 (en) 2012-07-03 2016-06-07 Thoratec Corporation Catheter pump
US10086121B2 (en) 2012-07-03 2018-10-02 Tc1 Llc Catheter pump
US9381288B2 (en) 2013-03-13 2016-07-05 Thoratec Corporation Fluid handling system
US10071192B2 (en) 2013-03-15 2018-09-11 Tc1 Llp Catheter pump assembly including a stator
US9308302B2 (en) 2013-03-15 2016-04-12 Thoratec Corporation Catheter pump assembly including a stator
US10029037B2 (en) 2014-04-15 2018-07-24 Tc1 Llc Sensors for catheter pumps
US9827356B2 (en) 2014-04-15 2017-11-28 Tc1 Llc Catheter pump with access ports
US10105475B2 (en) 2014-04-15 2018-10-23 Tc1 Llc Catheter pump introducer systems and methods
US9770543B2 (en) 2015-01-22 2017-09-26 Tc1 Llc Reduced rotational mass motor assembly for catheter pump
US9675739B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Motor assembly with heat exchanger for catheter pump
US9675738B2 (en) 2015-01-22 2017-06-13 Tc1 Llc Attachment mechanisms for motor of catheter pump
US9987404B2 (en) 2015-01-22 2018-06-05 Tc1 Llc Motor assembly with heat exchanger for catheter pump
US9907890B2 (en) 2015-04-16 2018-03-06 Tc1 Llc Catheter pump with positioning brace

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