CN103316387A - Implant-type blood flowing pump with self-suspended shaft - Google Patents
Implant-type blood flowing pump with self-suspended shaft Download PDFInfo
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- CN103316387A CN103316387A CN 201210074000 CN201210074000A CN103316387A CN 103316387 A CN103316387 A CN 103316387A CN 201210074000 CN201210074000 CN 201210074000 CN 201210074000 A CN201210074000 A CN 201210074000A CN 103316387 A CN103316387 A CN 103316387A
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Abstract
The invention relates to the technical field of medical instruments and discloses an implant-type blood flowing pump with a self-suspended shaft. In the implant-type blood flowing pump, a rotor comprises a hollow cylindrical steel magnet (5) and built-in blades fixed in the steel magnet (5); the rotor is directly arranged in the middle of a stator; the stator is neither directly nor indirectly connected with the rotor through a bearing; the rotor automatically separated form the inner wall of the stator during rotating and is in a suspended state. As the bearing and a magnetic suspension control system are not adopted, the size of the implant-type blood flowing pump is smaller and the weight of the implant-type blood flowing pump is lighter, the implant-type blood flowing pump does not stop rotating when a mechanical failure occurs to the bearing, so that the reliability is higher, and the formation of thrombus in the position of the bearing is avoided. The implant-type blood flowing pump adopts a serial structure that the built-in blades (8) are in the front and the external blades (9) are in the rear; the tangent planes of the blades adopt the modes of the wings of a marine ducted propeller, so that the implant-type blood flowing pump can ensure that blood smoothly branches in and passes through main vessels and branch vessels.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly a kind of implanted ventricular assist device.
Background technology
Heart failure is the modal diagnosis of cardiovascular patient, also is the highest disease of medical expense, in the world with heart failure as an important topic that need solve this century.Because the shortage of donor, about 30% preparation are accepted the patient of heart transplantation and die from the cardiac function deterioration in being waited for for heart process.
Ventricular assist device (Ventricular Assist Devices, abbreviation " VAD ") appearance and development, make the treatment of heart failure had new by way of, since 1981, (the National Institutes of Health of NIH, be called for short " NIH ") initiation RFPs (a Request For Proposals, be called for short " request for proposal ") plan, be used for development " implantable that is used for long-term heart support can make patient moves freely, the ventricular assist device of the electronic energy ".Up to the present, be total to the fund of input above 40,000,000,000 dollars to support the research and development of ventricular assist device.European heart failure guide in 2006 with ventricular assist device as one of method of heart failure treatment.Through years of researches, at present, there had several products to be applied in the world to be clinical, is mainly used in the transition of heart transplantation, recovery even the permanent replacement therapy of cardiac function.But imported product is expensive, and the production domesticization research of ventricular assist device is extremely urgent.
At present, the pumping system of general ventricular assist device, be example with Domestic V Z-IIA type blood pump and Berlin Heart Incor 1, its magnetic steel of motor rotor, blood pump rotor and bearing or magnetic suspension control body are with placing the blood runner, so not only increased the volume and weight of entire pump machine system, and in the blood runner, place rotor magnetic steel and the magnetic suspension control body has also reduced blood flow greatly, and the air gap between motor stator and rotor increases, and power demand also increases.
Therefore, the present inventor finds that existing implanted magnetic levitation axial flow blood pump has bearing on the market, and bearing is easy to wear, easily vibration, and service life is short, and reliability is low, forms thrombosis easily.And, maglev control system complex structure, volume is big, Heavy Weight.Therefore, ventricular assist device not only wants cube little, in light weight, but also claimed apparatus running must balance, vibration is little, noise is low, the comfort level when using with the raising patient.
Summary of the invention
The object of the present invention is to provide a kind of implanted from suspending axial flow blood pump, the volume of blood pump is littler, and weight is lighter, can not stop operating because of the mechanical breakdown of bearing, and reliability is higher, and has avoided at position of bearings formation thrombosis.
For solving the problems of the technologies described above, embodiments of the present invention disclose a kind of implanted from suspending axial flow blood pump, comprising: stator and rotor, and wherein stator comprises: stator core (2) and stator coil (3); Rotor comprises: cylinder magnet steel (5) and built-in tandem blade (8);
Do not connect directly or indirectly with bearing between stator and the rotor;
Stator coil (3) places within the stator core (2); Stator coil (3) is used for producing the alternating magnetic field that drives cylinder magnet steel (5) rotation after energising;
Stator coil (3) has a cylindrical hollow inwall; Cylinder magnet steel (5) places among this cylindrical hollow inwall;
An axial center hole is arranged in the cylinder magnet steel (5), and built-in tandem blade (8) places this center hole, and the blade tip of built-in tandem blade (8) and the inwall of this center hole are fixed into one.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Rotor comprises hollow cylindrical magnet steel and the built-in blade that is fixed therein, and rotor directly places in the middle of the stator, does not connect directly or indirectly with bearing between stator and the rotor, and rotor breaks away from when rotating and the contacting of stator inner wall voluntarily, is from suspended state.Because do not use bearing or magnetic suspension control system, so the volume of blood pump is littler, weight is lighter, can not stop operating because of the mechanical breakdown of bearing, and reliability is higher, and has avoided at position of bearings formation thrombosis.Because do not need complicated magnetic suspension control system, so the cost of blood pump is lower, better reliability.
Further, stator coil (3) adopts the drag cup winding, has not only solved the problem of undersized stator winding installation difficulty, and stator core no longer includes teeth groove, has thoroughly eliminated the rotation fluctuation in essence that bring in slot ripples magnetic field.
Further, adopt built-in tandem blade (8) pro-, external blade (9) after structure, can guarantee blood when entering runner, be subjected to the effect of built-in tandem blade (8) moving blade earlier, guarantee that most blood pass through from sprue, micro blood then passes through by means of the blade tip partial action of the external blade (9) that is arranged on the back, can guarantee like this blood lead, bifurcated smoothly in the branch flow passage, smoothness is passed through, and does not produce congested thrombosis phenomenon.
Further, the blade section of built-in tandem blade (8) and external blade (9) adopts the airfoil blade tangent plane form of ducted propeller peculiar to vessel, when blood flow is crossed the airfoil blade section, blade section malleation occurs on the blade face, negative pressure appears on the blade section blade back, the pressure differential of blade face and blade back can improve blood pump efficient, increases pressure head.
Further, employing two is conducted, the conduction mode of three-phase six states, has not only improved the utilization rate of winding, has dwindled volume and weight, and has reduced the magnetic state angle, has reduced to rotate fluctuation.
Further, outlet dextrorotation stator (7) is fixed together with electric machine support (4), plays the rotating energy effect of reclaiming.
Further, adopt circuit to realize to differentiate the function of rotor-position and self-starting, played the effect of position sensor, can cancel conventional position sensor, so both reduced the difficulty that seals, improved reliability, simplify the structure again, dwindled volume.
Description of drawings
Fig. 1 be in the first embodiment of the invention a kind of implanted from the levitation axis pump structure sketch map (profile) of bleeding;
Fig. 2 is a kind of structural representation of starching the integrated tandem blade of axle in the first embodiment of the invention;
Fig. 3 is a kind of blade section and stressed sketch map thereof of starching the integrated tandem blade of axle in the first embodiment of the invention;
Fig. 4 is the radial section sketch map of a kind of stator, rotor structure in the first embodiment of the invention;
Fig. 5 be in the first embodiment of the invention a kind of implanted from suspending the original state structural representation (profile) of axial flow blood pump;
Fig. 6 be in the first embodiment of the invention a kind of implanted from suspending the suspended state structural representation (profile) of axial flow blood pump.
The specific embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of implanted from suspending axial flow blood pump.Fig. 1 is this implanted from the levitation axis pump structure sketch map (profile) of bleeding.
Specifically, as shown in Figure 1, this implanted comprises from the axial flow blood pump that suspends: stator and rotor, wherein stator comprises: stator core (2) and stator coil (3).Rotor comprises: cylinder magnet steel (5) and built-in tandem blade (8).
Do not connect directly or indirectly with bearing between stator and the rotor.
Bearing in each embodiment of the present invention comprises direct-connected bearing, also comprises not direct-connected bearing, as magnetic suspension bearing.
Stator coil (3) places within the stator core (2).Stator coil (3) is used for producing the alternating magnetic field that drives cylinder magnet steel (5) rotation after energising.
Stator core (2) is the structure of a hollow tube-shape, because the existence of stator core (2), can make the cylinder magnet steel (5) made by permanent magnet material rely on the effect of magnetic force to be attracted middle part in stator core (2) firmly, the counteracting force that produces in the time of can be because of rotation and cause rotor to break away from the stator middle part.
Stator coil (3) adopts the drag cup winding.
Stator coil (3) has a cylindrical hollow inwall.Cylinder magnet steel (5) places among this cylindrical hollow inwall.
Stator coil (3) adopts the drag cup winding, has not only solved the problem of undersized stator winding installation difficulty, and stator core no longer includes teeth groove, has thoroughly eliminated the rotation fluctuation in essence that bring in slot ripples magnetic field.
In addition, be appreciated that stator coil (3) also can not adopt the drag cup winding in some other embodiment of the present invention, and adopt other coil form.
Stator employing two is conducted, the conduction mode of three-phase six states.
Employing two is conducted, the conduction mode of three-phase six states, has not only improved the utilization rate of winding, has dwindled volume and weight, and has reduced the magnetic state angle, has reduced to rotate fluctuation.
In addition, be appreciated that stator also can adopt other conduction mode in some other embodiment of the present invention, and be not limited only to two to be conducted, the conduction mode of three-phase six states.
Also fixedly there is motor housing (1) outside of stator.
Electric machine support (4) is fixedly arranged on the stator inner wall, and this electric machine support (4) has a cylindrical hollow inwall, and rotor places among this cylindrical hollow inwall.
In addition, also comprise: outlet dextrorotation stator (7), this outlet dextrorotation stator (7) place implanted from the blood stream outlet end of the axial flow blood pump that suspends, and are fixed together with electric machine support (4), play the rotating energy effect of reclaiming, and further reduce and rotate fluctuation.
The axis of cylinder magnet steel (5) is parallel to the axis of stator coil (3).
Cylinder magnet steel (5) is the whole cylindrical pillars steel of that made by rubidium ferrum B permanent magnetic material a, radial magnetizing and a pair of utmost point.
Cylinder magnet steel (5) adopts has the high rubidium ferrum B permanent magnetic material of remanence strength, and adopt the cylindrical pillars steel of radial magnetizing, a pair of utmost point, can be under this big electromagnetism air gap of drag cup winding, still can produce stronger air-gap field, thereby dwindle the volume and weight of motor, easier ensure the quality of products even of the whole cylindrical magnet steel of a pair of utmost point, reduced the unbalance dynamic under the high-speed motion, and because there is not unilateral magnetic force, so running steadily, has improved the comfortableness of using.
An axial center hole is arranged in the cylinder magnet steel (5), and built-in tandem blade (8) places this center hole, and the blade tip of built-in tandem blade (8) and the inwall of this center hole are fixed into one.
Constitute the sprue of blood flow between the endoporus of cylinder magnet steel (5).
Sprue in cylinder magnet steel (5) endoporus do not have other any blockages, so runner is unobstructed, allows that big blood flow is smooth and easy to be passed through.
In addition, also comprise: oar axle (10) and external blade (9).
External blade (9) is greater than built-in tandem blade (8), external blade (9) is near blood stream outlet one end of implanted from the axial flow blood pump that suspends, place the outside of the center hole of cylinder magnet steel (5), be associated on the oar axle (10) with built-in tandem blade (8) integrated series, constitute slurry axle integrated tandem blade (6).
The blade section of built-in tandem blade (8) and external blade (9) adopts the airfoil blade tangent plane form of ducted propeller peculiar to vessel.
The blade section of built-in tandem blade (8) and external blade (9) adopts the airfoil blade tangent plane form of ducted propeller peculiar to vessel, when blood flow is crossed the airfoil blade section, blade section malleation occurs on the blade face, negative pressure appears on the blade section blade back, the pressure differential of blade face and blade back can improve blood pump efficient, increases pressure head.
Because the blood pump inner flow passage is long and narrow, the blade diameter of rotor is restricted, and runner is divided into sprue and branch flow passage again, and the present invention has adopted the tandem propeller concept in the extraordinary propeller of marine propeller, and the rotor of blood pump is designed to tandem blade form.So-called tandem blade refers to the blade of different sizes is installed on the same axis, and by same rotating speed rotation, it is long and narrow that this class tandem blade form is specially adapted to implanted blood pump runner, the restricted situation of root diameter.
In addition, be appreciated that, in some other embodiment of the present invention, the blade section of built-in tandem blade (8) and external blade (9) also can not adopt the airfoil blade tangent plane form of ducted propeller peculiar to vessel, and adopt other form, for example, can be the dull and stereotyped blade section form of general pump.
Fig. 2 is the structural representation of the integrated tandem blade of this slurry axle.
Fig. 3 is blade section and the stressed sketch map thereof of the integrated tandem blade of this slurry axle.
Constitute sprue (11) and (12) of blood flow between the inwall of slurry axle integrated tandem blade (6) and electric machine support (4) and the endoporus of cylinder magnet steel (5); Constitute branch flow passage (13) and (14) of blood flow between the inwall of the outer wall of cylinder magnet steel (5) and electric machine support (4).
In the sprue, do not have other any blockages, so runner is unobstructed, allows smooth and easy the passing through of blood of big flow.
In branch flow passage (13) and (14), hinder the blood flow mistake without any blockage, and because the branch flow passage gap is very little, the air gap of stator coil (3) and cylinder magnet steel (5) is also very little, thereby significantly reduces the volume and weight of blood pump.
Adopt built-in tandem blade (8) pro-, external blade (9) after structure, can guarantee that blood is from blood flow import (15) when entering runner, be subjected to the effect of built-in tandem blade (8) moving blade earlier, guarantee that most blood pass through from sprue, micro blood then passes through by means of the blade tip partial action of the external blade (9) that is arranged on the back, can guarantee like this blood lead, bifurcated smoothly in the branch flow passage, smoothness is passed through, and does not produce congested thrombosis phenomenon.
Consider that this implanted is used for the implanted ventricular assist device from the axial flow blood pump that suspends, sealing to structure has very high requirement, if adopt conventional brushless direct current motor position sensor, then because of the outlet of sensor stator Hall element too much (at least 5), bring the effect of lead-in wire sealing and lead material and human body rejection, the present invention adopts circuit to realize differentiating rotor-position and self-running function, played the function of position sensor, can cancel the position sensor of conventional brushless direct current motor indispensability, so both reduced the difficulty that seals, improve reliability, simplified the structure again, dwindled volume.
Rotor comprises hollow cylindrical magnet steel and the built-in blade that is fixed therein, and rotor directly places in the middle of the stator, does not connect directly or indirectly with bearing between stator and the rotor, and rotor breaks away from when rotating and the contacting of stator inner wall voluntarily, is from suspended state.Because do not use bearing or magnetic suspension control, so the volume of blood pump is littler, weight is lighter, can not stop operating because of the mechanical breakdown of bearing, and reliability is higher, and has avoided at position of bearings formation thrombosis.
Fig. 4 is the radial section sketch map of this stator, rotor structure.
After stator coil (3) energising, air gap between the outer wall of the inwall of stator coil (3) and cylinder magnet steel (5) produces rotating excitation field and drives cylinder magnet steel (5) rotation, because the effect of cylinder magnet steel rotary centrifugal force, the original state that the moment disengaging of cylinder magnet steel contacts with stator coil, and the inwall that is limited to electric machine support (4), and medium is incompressible fluid, the cylinder magnet steel reaches the suspension rotation status coaxial with stator coil very soon, and driving is rotated with the integrated tandem blade of oar axle (6) that the cylinder magnet steel is connected, blood just sucks from the blood flow import (15) of the pump housing, flows out from outlet.
Fig. 5 is that this implanted is from the original state structural representation (profile) of the axial flow blood pump that suspends; Fig. 6 is this implanted from the suspended state structural representation (profile) of the axial flow blood pump that suspends, wherein, numbering 20 expressions be cylinder magnet steel external diameter, 21 expressions be the electric machine support internal diameter.
This implanted is simple from the levitation axis pump configuration of bleeding, volume is little, and is in light weight, and blood is by sprue and branch flow passage bifurcated, it is smooth and easy to flow, there is not congested thrombosis phenomenon, no bearing friction, running balance, use comfortable, blood pump efficient height, haemolysis and preventing thrombosis are functional, are suitable for fully as the implanted ventricular assist device.
The inventor develops the no bearing implanted of an example from suspending the axial flow blood pump model machine on November 17th, 2011 according to above principle.This model machine has successfully rotated four months, at present still in normal steady running.This model machine can comprehensive startup and is stopped, and can run well under the impact of certain external force (clash into or rock etc.).Simultaneously, since on November 17th, 2011 so far, the inventor carries out fatigue test to this implanted from the axial flow blood pump that suspends, and carries out real time record by computer, wherein, under the situation that opens intermittently, stops, model machine also can run well.
Following table is that this model machine is from running on November 17th, 2011 test data of experiment table so far.
| Date | Rotating speed RPM | Pressure MMHG | Electric current A | Flow L/MIN |
| 2011.12.07 | 7610 | 99.10 | 0.55 | 4.85 |
| 2011.12.12 | 7599 | 98.70 | 0.55 | 4.90 |
| 2011.12.17 | 7623 | 99.80 | 0.55 | 4.81 |
| 2011.12.22 | 7630 | 99.81 | 0.55 | 4.50 |
| 2012.01.09 | 7684 | 99.15 | 0.55 | 4.80 |
| 2012.01.14 | 7600 | 98.70 | 0.55 | 4.80 |
| 2012.01.19 | 7557 | 94.29 | 0.51 | 4.40 |
| 2012.01.24 | 7704 | 97.62 | 0.55 | 4.85 |
| 2012.01.29 | 7550 | 94.02 | 0.51 | 4.40 |
| 2012.02.05 | 7488 | 94.01 | 0.51 | 4.80 |
| 2012.02.10 | 7408 | 93.80 | 0.51 | 4.80 |
| 2012.02.15 | 7501 | 95.00 | 0.52 | 4.81 |
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. an implanted is characterized in that from suspending axial flow blood pump, comprising: stator and rotor, and wherein stator comprises: stator core (2) and stator coil (3); Rotor comprises: cylinder magnet steel (5) and built-in tandem blade (8);
Do not connect directly or indirectly with bearing between stator and the rotor;
Stator coil (3) places within the stator core (2); Stator coil (3) is used for producing the alternating magnetic field that drives cylinder magnet steel (5) rotation after energising;
Stator coil (3) has a cylindrical hollow inwall; Cylinder magnet steel (5) places among this cylindrical hollow inwall;
An axial center hole is arranged in the cylinder magnet steel (5), and built-in tandem blade (8) places this center hole, and the blade tip of built-in tandem blade (8) and the inwall of this center hole are fixed into one.
2. implanted according to claim 1 is characterized in that from suspending axial flow blood pump, and described stator coil (3) adopts the drag cup winding.
3. implanted according to claim 2 is characterized in that from the axial flow blood pump that suspends, described cylinder magnet steel (5) by a rubidium ferrum B permanent magnetic material make, the whole cylindrical pillars steel of radial magnetizing and a pair of utmost point.
4. implanted according to claim 3 is characterized in that from suspending axial flow blood pump, also comprises: oar axle (10) and external blade (9);
External blade (9) is greater than built-in tandem blade (8), external blade (9) is near blood stream outlet one end of implanted from the axial flow blood pump that suspends, place the outside of the center hole of cylinder magnet steel (5), be associated on the oar axle (10) with built-in tandem blade (8) integrated series, constitute slurry axle integrated tandem blade (6).
5. implanted according to claim 4 is characterized in that from suspending axial flow blood pump the blade section of described built-in tandem blade (8) and external blade (9) adopts the airfoil blade tangent plane form of ducted propeller peculiar to vessel.
6. implanted according to claim 5 is characterized in that from suspending axial flow blood pump, and described stator adopts two to be conducted the conduction mode of three-phase six states.
7. implanted according to claim 6 is characterized in that from suspending axial flow blood pump the external stability of described stator has motor housing (1).
8. implanted according to claim 7 is characterized in that from suspending axial flow blood pump electric machine support (4) is fixedly arranged on the described stator inner wall, and this electric machine support (4) has a cylindrical hollow inwall, and rotor places among this cylindrical hollow inwall.
9. implanted according to claim 8 is characterized in that from suspending axial flow blood pump, also comprises: outlet dextrorotation stator (7), this outlet dextrorotation stator (7) place implanted from the blood stream outlet end of the axial flow blood pump that suspends, and are fixed together with electric machine support (4).
According to each described implanted in the claim 1 to 9 from the axial flow blood pump that suspends, it is characterized in that, constitute sprue (11) and (12) of blood flow between the inwall of slurry axle integrated tandem blade (6) and electric machine support (4) and the endoporus of cylinder magnet steel (5); Constitute branch flow passage (13) and (14) of blood flow between the inwall of the outer wall of cylinder magnet steel (5) and electric machine support (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210074000 CN103316387A (en) | 2012-03-19 | 2012-03-19 | Implant-type blood flowing pump with self-suspended shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210074000 CN103316387A (en) | 2012-03-19 | 2012-03-19 | Implant-type blood flowing pump with self-suspended shaft |
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| CN103316387A true CN103316387A (en) | 2013-09-25 |
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| CN 201210074000 Pending CN103316387A (en) | 2012-03-19 | 2012-03-19 | Implant-type blood flowing pump with self-suspended shaft |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104208764A (en) * | 2014-09-26 | 2014-12-17 | 长治市久安人工心脏科技开发有限公司 | Magnetic fluid suspension type axial pump heart assisting device |
| CN104436338A (en) * | 2013-09-17 | 2015-03-25 | 上海市东方医院 | Implantable self-suspension axial-flow blood pump |
| CN113082507A (en) * | 2021-05-12 | 2021-07-09 | 苏州大学 | Apply to artificial heart's magnetic suspension device |
-
2012
- 2012-03-19 CN CN 201210074000 patent/CN103316387A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104436338A (en) * | 2013-09-17 | 2015-03-25 | 上海市东方医院 | Implantable self-suspension axial-flow blood pump |
| WO2015039605A1 (en) * | 2013-09-17 | 2015-03-26 | 上海微创医疗器械（集团）有限公司 | Implanted self-suspended axial flow blood pump |
| CN104208764A (en) * | 2014-09-26 | 2014-12-17 | 长治市久安人工心脏科技开发有限公司 | Magnetic fluid suspension type axial pump heart assisting device |
| CN104208764B (en) * | 2014-09-26 | 2016-08-17 | 长治市久安人工心脏科技开发有限公司 | A kind of magnetic liquid suspension formula axial-flow pump heart-assist device |
| CN113082507A (en) * | 2021-05-12 | 2021-07-09 | 苏州大学 | Apply to artificial heart's magnetic suspension device |
| CN113082507B (en) * | 2021-05-12 | 2023-01-13 | 苏州大学 | Apply to artificial heart's magnetic suspension device |
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Owner name: SHANGHAI MICROPORT MEDICAL EQUIPMENT (GROUP) CO., Free format text: FORMER OWNER: SHANGHAI EAST HOSPITAL Effective date: 20150128 |
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Effective date of registration: 20150128 Address after: 201203, 501, Newton Road, Zhangjiang hi tech park, Shanghai, Pudong New Area Applicant after: Shanghai MicroPort Medical Equipment (Group) Co., Ltd. Address before: 200120 Jimo Road, Shanghai, No. 150, No. Applicant before: Shanghai East Hospital |
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Application publication date: 20130925 |