CN101810891B - Self-suspending artificial heart - Google Patents
Self-suspending artificial heart Download PDFInfo
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- CN101810891B CN101810891B CN200910146130A CN200910146130A CN101810891B CN 101810891 B CN101810891 B CN 101810891B CN 200910146130 A CN200910146130 A CN 200910146130A CN 200910146130 A CN200910146130 A CN 200910146130A CN 101810891 B CN101810891 B CN 101810891B
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Abstract
The invention discloses a self-suspending artificial heart. A rotor rotates in a pump body, so fluid is boosted to flow outside along the circumferential direction. The self-suspending artificial heart is characterized in that: the rotor consists of blades of even number; the blades are symmetrically distributed in an axial direction; the blades are connected and fixed by connecting rods; each blade has an approximately cylindrical shape; each blade comprises a flow-receiving surface and a back surface in the flow direction of a medium; and under the condition that the included angles between the upper and lower end surfaces of the rotor and the rotary horizontal plane are more than 0 degree and the condition that the included angle, namely a lower bottom angle, between the lower end surface and the rotary horizontal plane is more than or equal to 0 degree, the clearances between the upper and lower end surfaces of the rotor and the rotor of the pump body decrease progressively from the flow-receiving surface to the back surface. The self-suspending artificial heart has extremely high self-balance and self-adjustment characteristics, can effectively reduce damages to the blood and the formation of thromboses in the artificial heart, strengthen compatibility with the blood, reduce the manufacturing cost, improve the balance of the action forces applied by the blood in the artificial heart onto the rotor in different directions and improve the stability and safety of the rotor in operation.
Description
Technical field
The invention belongs to the biomedical engineering technology field, be specifically related to be used for the artificial heart blood transport or be used for other rotor contactless, the no bearing of the fluidic conveying of shear-sensitive.
Background technology
In recent years; Along with the modern medical service technology rapid development; Propose higher requirement for the research and development of medical equipment, how to design and develop efficiently, reliable, the medical equipment of new generation that meets the ergonomic biological requirement is the key subjects that each researcher faces.For pumping blood or other to shear sensitive liquid, the researcher of cardiovascular medical instruments field constantly improves and makes that blood pump housing volume is little, work is more reliable, reduces as much as possible the pumped (conveying) medium deleterious impact.
Rotary blood pump is existing certain application in the operation on heart treatment, can partly or entirely substitute human heart blood supply function, as: heart-assist device.Common is centrifugal blood pump, is about to blade and is contained on the axle, when the axle high speed rotating; These blade pass are crossed guide blood and are changed the pressure that its direction of motion increases blood; Blade will form arterial pressure to the dynamic action of blood, and such heart-assist device has been applied to clinical.Because it is better that centrifugal blood pump and other form blood pump are compared blood compatibility, in recent years, obtains using more widely.Yet, there is bearing to exist in the general blood pump rotor structure, Figure of description Fig. 3 is a U.S. Biomedicus centrifugal blood pump; Be provided with radial ball bearing in this device, the shearing force that during its rotation blood is produced is big, and is destructive strong; Friction generates is arranged simultaneously, possibly cause the formation of thrombosis.
In the design of in recent years blood pump, for the magnetic levitation technology that reduces to rub is applied to blood pump, blade leans on magnetic levitation in pump, need not to support, and has avoided the friction between the blade and the pump housing, reduces the generation of thrombosis.But need a series of control electronics and pick off on its structure, increased the weight of, strengthened the weight and the size of artificial heart.Simultaneously, owing to set up electronic equipment, cause more unsafe factors.
The artificial heart blood pump of invention disclosed patent application CN100382855C is a kind of complete artificial heart pump that adopts the bearing free, engine free and axle free of magnetic suspension mode in addition; This type artificial heart as stated; The structure processing cost is high; Actuating coil need be controlled impeller respectively to stressed with pick off, and functional reliability is relatively poor.
Summary of the invention
In order to improve existing artificial heart prior art complex structure; Manufacturing cost is high, to the deficiency of blood cutting damage blood mechanism, the object of the present invention is to provide a kind of self-suspending artificial heart, it can satisfy the use in the clinical treatment; Reduce destruction to hemocyte; The compatibility of improvement and blood has reduced research and development and the cost of making, and has had high self-balancing and self regulating charactoristic.
For the technical scheme that reaches goal of the invention the present invention employing is:
A kind of self-suspending artificial heart, said rotor rotates in the pump housing, and fluid pressurized is along the circumferential direction flowed out; It is characterized in that said rotor is made up of even leaves, be axial symmetrical distribution, be connected and fixed by connecting rod between each blade; Each blade is roughly cylindric, and the direction of media flow comprises fluoran stream surface and lee side relatively; Said fluoran stream surface is meant the one side of forward media flow, and said lee side is meant the one side of media flow dorsad; The both ends of the surface up and down of rotor blade are ramp and lower inclined plane; Suppose after the central shaft cutting; The intersection in ramp and cross section is to go up end face angle β with the formed angle of rotation horizontal plane; β＞0 °, the intersection in lower inclined plane and cross section is bottom surface angle α with the formed angle of rotation horizontal plane, α >=0 °;
Rotor blade up and down forms rotor clearance between both ends of the surface and the pump housing, and said rotor clearance is meant up and down both ends of the surface, and each puts the distance of corresponding pump housing inner surface, and the rotor clearance from the fluoran stream surface to the lee side successively decreases.
The both ends of the surface up and down of the rotor blade of self-suspending artificial heart of the present invention are equipped with the design of two inclined planes, and have a certain degree with the relative flow direction shape of blood, simultaneously; Form certain interval between the both ends of the surface and the pump housing up and down, the rotor clearance from the fluoran stream surface to the lee side is when successively decreasing, and rotor places the supercharging of artificial heart shell internal rotation; Can regulate the active force of each direction of motion in blood flow automatically during through rotor, make rotor keep high self-balancing state, need not bearing; Contactless between rotor and the shell, there is not friction, this rotor meets the biofluid dynbamics characteristic; Can reduce the high shear force that produces because of rotation destruction to blood tissues; And its main body is that fluoran stream surface and lee side are one cylindric, and this design blade satisfies under the prerequisite of clinical patients treatment, can effectively improve rotor stability of rotation and self-regulation; Can balance because of the rotor unbalance stress that reasons such as blood flow pulsation cause, strengthened the operational reliability of rotor.
The angle of said bottom surface angle for limiting has a significant effect, following bottom surface corner α=10 ° ± 10 °.
Same, when last end face angle β=40 ° ± 20, have the self-balancing high stability.
Especially be 20 μ m～100 μ m at rotor clearance, patent of the present invention can be showed more excellent stability characteristic (quality).
Compare the blood pump of prior art, self-suspending artificial heart provided by the invention, its beneficial effect is:
(1) compare as the blood pump of driving force with utilizing magnetic levitation technology, regulate automatically because of adopting dynamic pressure, need not any additional control appliance, cost is cheaper, control more simply, also safer, and processing and manufacturing is more easy.
(2) compare with other axial flow type blood pump, under the condition of same conveying blood pressure, this programme only needs the rotating speed of axial blood pump about 1/4; Therefore, have stability and reliability efficiently, the axle that needs bearing and connect rotor; Contactless; Do not have friction, reduced the destructiveness of rotor effectively, greatly improved the blood compatibility and the dynamics of artificial heart hemocyte.
(3) volume is little, and is in light weight, and gross weight is lower than 200g, can be used as the type artificial heart that implants.
(4) effectively strengthen the inner blood flow of artificial heart to the mutual balance between the rotor different directions active force, improve the stability and the safety of rotor operation.
(5) reduce the formation of rotor effectively, strengthen the compatibility of rotor and blood thrombosis in the destruction of blood and the artificial heart.
Figure of description
Fig. 1 rotor structural representation of the present invention.
Fig. 2 rotor plan structure of the present invention sketch map.
Fig. 3 rotor force analysis of the present invention figure.
Fig. 4 rotor blade of the present invention A-A cross section structure sketch map.
Fig. 5 rotor performance characteristic of the present invention H-Q figure.
Wherein: 1 is rotor, and 11 is rotor blade, and 12 is ramp, and 13 is lower inclined plane, and 2 is connecting rod between rotor, and 3 is the rotor center of rotation, and 4 is the artificial heart shell, and 5 is the rotor fluoran stream surface, and 6 is the rotor lee side, and 8 are the blood flow inlet, and 9 are the blood flow outlet.
The specific embodiment
Come the present invention is further specified below in conjunction with specific embodiment, but do not limit the invention to these specific embodiment.One skilled in the art would recognize that the present invention contained in claims scope all alternatives, improvement project and the equivalents that possibly comprise.
Embodiment 1
Implement according to Fig. 1-technical scheme shown in Figure 5, can be applicable to clinical novel artificial heart.A plurality of rotors (or rotor blade) are symmetrically placed in the artificial heart shell 4, and rotor 1 is made up of even leaves, is axial symmetrical distribution; Connect fixing by connecting rod 2 between each blade; Rotor 1 is around center of rotation 3 rotations, and blood autoblood inflow entrance 8 gets in the shell, along the circumferential direction flows at housing; Autoblood flow export 9 output blood are seen Fig. 1 after the supercharging.
Each blade is roughly cylindric, promptly from the vertical view of Fig. 2, can find out, orthographic projection of lower inclined plane is circular on it.
The direction of media flow comprises fluoran stream surface 5 and lee side 6 relatively, and fluoran stream surface is meant the one side of forward media flow, and lee side is meant the one side of media flow dorsad.
Between fluoran stream surface and the lee side folded rotor blade up and down both ends of the surface be ramp 12 and lower inclined plane 13; Suppose after the central shaft cutting; The intersection L1 in ramp 12 and cross section is to go up end face angle β with the formed angle of rotation horizontal plane, β＞0 °, and the intersection L2 in lower inclined plane 13 and cross section is bottom surface angle α with the formed angle of rotation horizontal plane; α >=0 °; It should be noted that lower inclined plane is not to be meant that the certain and horizontal plane of L2 has angle, during α when parallel=0 °, also can accomplish the present invention.α is 10 ° in the present embodiment, and β is 40
Rotor blade up and down forms rotor clearance δ between both ends of the surface and the pump housing, and rotor clearance is meant up and down both ends of the surface, and each puts the distance of corresponding pump housing inner surface, and the rotor clearance from the fluoran stream surface to the lee side successively decreases.
As shown in Figure 4, suppose that behind the circumferencial direction cutting rotor of rotor in the cross section that rotor is cut, the intersection of facet and fluoran stream surface is L3, the intersection of facet and ramp is L4, the intersection point of L3 and L4 is δ to the distance of pump housing inside upper surface "
1, the intersection of facet and fluoran stream surface is L5, the intersection point of L5 and L4 is δ to the distance of pump housing inside upper surface "
2, δ "
1＞δ "
2The intersection of facet and lower inclined plane is L6, and the intersection point of L3 and L6 is δ ' to the distance of the inboard lower surface of the pump housing
1, the intersection point of L5 and L6 is δ ' to the distance of the inboard lower surface of the pump housing
2, δ '
1＞δ '
2
In the present embodiment, δ "
1=δ '
1=60 μ m, δ "
2=δ '
2=20 μ m.
At the ramp 12 and lower inclined plane 13 of rotor blade, the longshore current body direction of motion, 6 are respectively equipped with symmetrical inclined-plane from fluoran stream surface 5 to lee side; Realize from axial self-balancing; Because the design of the rotor of symmetrical structure, stressed the cancelling out each other of x direction at radial direction upper rotor part I and rotor II reaches balance; The stressed component by α and β of z direction reaches balance.
Rotor blade design principle of the present invention such as Figure of description Fig. 1-4; The quantity of rotor is even number, and rotor distributes along the Z axial symmetry, because the design of symmetrical structure; Can cancel out each other in that the x direction of rotor radius direction upper rotor part I and rotor II is stressed, reach balance; The stressed component by α and β of z direction reaches balance.Blade A-A cross section force diagram is as shown in Figure 4, and when rotor rotates, rotor will be made move toward one another with respect to medium fluid, and medium fluid is respectively f to the end face of rotor and the active force of bottom surface
tAnd f
b,, in cartesian coordinate system, it can be decomposed into the component f on the horizontal y direction respectively according to the newtonian motion mechanics principle
TyAnd f
ByWith the component f on the vertical z direction
TzAnd f
Bz, because the symmetric design and the in the vertical direction component f of rotor
TzAnd f
BzAnd satisfy the curve linear relationship shown in Figure 4 between the gap delta respectively like Figure of description, therefore, at two power f
TzAnd f
BzThe effect lower rotor part can keep the automatic adjusting of its relative position on Z-direction through the dynamic equilibrium between this two power, adopt this dynamic pressure to regulate automatically, need not any additional control device.Adopt this dynamic pressure to regulate automatically, need not any additional control device.On the other hand, f as shown in Figure 3
tAnd f
bComponent f
TyAnd f
BxMake rotor keep balance along Z axle center, its structure has improved the stability and the reliability of its operation.
Rotor blade is designed to cylindric in the present invention; This design is under the prerequisite that satisfies the clinical patients treatment; The unbalance stress of the rotor all directions that cause because of reasons such as blood flow pulsation of balance effectively; Simultaneously, also can reduce the friction of rotor and blood, the high shear force that produces when reducing rotation is to the blood structural damage.At aspect of performance, through calculating and checking, rotor of the present invention is at 3000rpm; The blood inlet flow reaches desired value 5L/min, and its outlet pressure can reach 100mmHg (as shown in Figure 5), and high workload efficient is 40%-50%; Maximum shear stress is less than 30N; Content of hemoglobin is lower than 0.01mg/l, can be in the work that suspends fully of 8 times of acceleration of gravity lower blades, and this design parameter satisfies the heart assistance requirement of the depleted patient treatment of clinical cardiac function.
The artificial heart of the present invention is when work, and symmetry is implanted the corresponding Magnet of polarity in rotor shown in the accompanying drawing 1, utilizes the principle of motor, and rotor receives the rotation of inducing of the outer rotary electromagnetic field of the pump housing.
The outside of pump case increases rotating excitation field, can adopt stator winding to be used for producing rotating excitation field.Connect three phase mains; Winding in every group of stator is mutual deviation 120 degree on dimensional orientation; When in stator winding, feeding three phase mains, stator winding will produce a rotating excitation field, and the frequency of rotating speed, number of magnetic poles and the use power supply of adjustment rotating excitation field reaches medical science and can use.
After stator winding produces rotating excitation field; Rotor will cut the magnetic line of force of rotating excitation field and produce faradic current; Electric current in the rotor bar interacts with rotating excitation field again and produces electromagnetic force; The electromagnetic torque that electromagnetic force produces drives rotor and rotates with certain rotating speed along the rotating excitation field direction, because above rotor blade shape, rotor of the present invention is suspended in pump housing internal rotation; Effectively improve the inner blood flow of artificial heart to the mutual balance between the rotor different directions active force, improved the stability and the safety of rotor operation.Simultaneously, this rotor can reduce the formation to thrombosis in the destruction of blood and the artificial heart effectively, strengthens the compatibility with blood.
Embodiment 2
Different with embodiment 1 is, present embodiment α is 20 °, and β is 20 °, δ "
1=20, δ '
1=20 μ m, δ "
2=10 μ m, δ '
2=5 μ m, last lower inclined plane are an oblique plane.
Embodiment 3
Different with embodiment 1 is, present embodiment α is 0 °, and β is 60 °, δ "
1=100, δ '
1=20 μ m, δ "
2=50 μ m, δ '
2=15 μ m, last lower inclined plane are an oblique curved surface.
Claims (4)
1. self-suspending artificial heart, rotor rotates in the pump housing, and fluid pressurized is along the circumferential direction flowed out; It is characterized in that said rotor is made up of even leaves, be axial symmetrical distribution, be connected and fixed by connecting rod between each blade; Each blade is cylindric, and the direction of media flow comprises fluoran stream surface (5) and lee side (6) relatively; Said fluoran stream surface is meant the one side of forward media flow, and said lee side is meant the one side of media flow dorsad; The both ends of the surface up and down of rotor blade are ramp and lower inclined plane; After central shaft cutting, the intersection in ramp and cross section with the formed angle of rotation horizontal plane be on end face angle β, β＞0 °; The intersection in lower inclined plane and cross section is bottom surface angle α with rotation horizontal plane formed angle, α＞0 °;
Rotor blade up and down forms rotor clearance between both ends of the surface and the pump housing, and said rotor clearance is meant up and down both ends of the surface, and each puts the distance of corresponding pump housing inner surface, and the rotor clearance from the fluoran stream surface to the lee side successively decreases.
2. according to the said self-suspending artificial heart of claim 1, it is characterized in that: said bottom surface angle α=20 °.
3. according to the said self-suspending artificial heart of claim 2, it is characterized in that: the said end face angle β of going up=40 ° ± 20 °.
4. according to any said self-suspending artificial heart of claim 1-3, it is characterized in that: said rotor clearance is 20 μ m～100 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910146130A CN101810891B (en) | 2009-06-08 | 2009-06-08 | Self-suspending artificial heart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910146130A CN101810891B (en) | 2009-06-08 | 2009-06-08 | Self-suspending artificial heart |
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| Publication Number | Publication Date |
|---|---|
| CN101810891A CN101810891A (en) | 2010-08-25 |
| CN101810891B true CN101810891B (en) | 2012-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910146130A Expired - Fee Related CN101810891B (en) | 2009-06-08 | 2009-06-08 | Self-suspending artificial heart |
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| Country | Link |
|---|---|
| CN (1) | CN101810891B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895709B (en) * | 2012-10-30 | 2015-02-25 | 浙江大学 | Hydraulic suspension type blood pump |
| EP4233989A3 (en) | 2017-06-07 | 2023-10-11 | Shifamed Holdings, LLC | Intravascular fluid movement devices, systems, and methods of use |
| EP3710076B1 (en) | 2017-11-13 | 2023-12-27 | Shifamed Holdings, LLC | Intravascular fluid movement devices, systems, and methods of use |
| EP4085965A1 (en) | 2018-02-01 | 2022-11-09 | Shifamed Holdings, LLC | Intravascular blood pumps and methods of use and manufacture |
| WO2021011473A1 (en) | 2019-07-12 | 2021-01-21 | Shifamed Holdings, Llc | Intravascular blood pumps and methods of manufacture and use |
| WO2021016372A1 (en) | 2019-07-22 | 2021-01-28 | Shifamed Holdings, Llc | Intravascular blood pumps with struts and methods of use and manufacture |
| WO2021062265A1 (en) | 2019-09-25 | 2021-04-01 | Shifamed Holdings, Llc | Intravascular blood pump systems and methods of use and control thereof |
| CN110721357B (en) * | 2019-10-18 | 2022-10-11 | 上海微创心力医疗科技有限公司 | Impeller assembly and suspension type blood pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6071093A (en) * | 1996-10-18 | 2000-06-06 | Abiomed, Inc. | Bearingless blood pump and electronic drive system |
| US6135710A (en) * | 1996-10-02 | 2000-10-24 | Jms Co., Ltd. | Turbo blood pump |
| CN1278188A (en) * | 1997-09-05 | 2000-12-27 | 文特拉西斯特股份有限公司 | Rotary pump with hydrodynamically suspended impeller |
-
2009
- 2009-06-08 CN CN200910146130A patent/CN101810891B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6135710A (en) * | 1996-10-02 | 2000-10-24 | Jms Co., Ltd. | Turbo blood pump |
| US6071093A (en) * | 1996-10-18 | 2000-06-06 | Abiomed, Inc. | Bearingless blood pump and electronic drive system |
| CN1278188A (en) * | 1997-09-05 | 2000-12-27 | 文特拉西斯特股份有限公司 | Rotary pump with hydrodynamically suspended impeller |
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| Publication number | Publication date |
|---|---|
| CN101810891A (en) | 2010-08-25 |
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Granted publication date: 20121024 Termination date: 20150608 |
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