CN107050543B - Microminiature centrifugal blood pump with self-adjusting blades - Google Patents
Microminiature centrifugal blood pump with self-adjusting blades Download PDFInfo
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- CN107050543B CN107050543B CN201710307309.9A CN201710307309A CN107050543B CN 107050543 B CN107050543 B CN 107050543B CN 201710307309 A CN201710307309 A CN 201710307309A CN 107050543 B CN107050543 B CN 107050543B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
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Abstract
The invention discloses a microminiature centrifugal blood pump with self-adjusting blades. The prior art cannot well control the boundary layer thickness, secondary flow and vortex noise in a microminiature blood centrifugal pump. The suction surface of each primary blade of the primary impeller is provided with a winglet; each secondary blade and one swinging blade are fixed through a cylindrical rod, and the cylindrical rods and the front end cover form a revolute pair; the inner side of the driving circular ring is provided with a circular arc-shaped rack, and a gear at the output end of the control box is meshed with the circular arc-shaped rack; the hinged ends of the connecting rods and the driving circular ring are uniformly distributed along the circumferential direction of the driving circular ring; and a dividing point is arranged on the molded line of each swing blade along the direction from the front edge to the tail edge of the swing blade according to the corresponding sectional area ratio of the cylindrical rod at the position of the molded line of each swing blade, and is used as the hinged end of the swing blade and the corresponding connecting rod. The two-stage blade has different attack angles, and the requirement on the installation angle of the adjustable blade under the condition of different flow parameters such as different speeds of blood on different spiral case sections is met.
Description
Technical Field
The invention belongs to the field of fluid transportation, relates to a microminiature centrifugal blood pump capable of automatically adjusting blades, low in noise and low in damage to blood cells, and in particular relates to a microminiature centrifugal blood pump with a winglet structure according to a control box and a connecting rod system.
Background
Pumps are a general-purpose machine which is very widely used, play a great role in the production and life of humans, and pumps of different kinds and sizes are also continuously manufactured and applied to various industries as new applications are required. Pumps can be broadly divided into the following categories, depending on the characteristic dimensions: conventional pumps, micro pumps and micro pumps. Wherein the characteristic scale range of the micro pump is approximately 1-50 mm, and the characteristic lengths of the micro pump and the conventional pump are respectively less than 1mm and more than 50 mm.
The micro pump has good application prospect due to the special size range, such as a cooling system of a micro motor and electronic equipment including a computer CPU, a pipeline pump, a temperature control system of a fuel cell, medical equipment which is most widely applied at present, and the like.
Considering the characteristics of high viscosity of blood and easy rupture of blood cells in blood transportation, it is important to design a microminiature centrifugal pump with low flow shear force and stable internal flow. However, in addition to the specificity of delivering liquids, the flow in miniature centrifugal pumps is very complex, mainly represented by: 1) Three-dimensional nature of flow; 2) Viscosity of the fluid; 3) Unsteady flow. Because of the viscosity of the transported blood and the specificity of the transport requirements, the viscosity affects not only the blade wake vortices formed at the blade outlet side to meet the kuta-rogowski conditions. Due to the viscosity, both the blade surfaces and the annular wall channel surfaces have viscous boundary layers, which have strong interactions with each other and with the main flow, creating a "secondary flow" phenomenon. Secondary flow is the main source of loss increase and efficiency decrease in miniature centrifugal pumps. At the same time, secondary flow and vortex breakdown are the primary sources of noise generated in centrifugal pumps.
At the same time, the heart delivers blood through diastole and systole, outputting pulsatile flow (flow, pressure pulsations). If the rotary blood pump simulates the natural heart of a human body to output pulsating flow (flow and pressure pulsation), the recovery of the human body after heart operation is facilitated. However, the rotational speed of the rotational metrorrhagia is periodically changed, and the flow parameters (flow rate, pressure and the like) of blood in the period change along with time, so that the speed, pressure and shearing force in the blood pump change all the time, and the formation of vortex and the damage of the shearing force to blood cells are aggravated by the time-varying flow state and the specificity of blood (blood cells are easy to break and blood viscosity is high). The installation angle of the traditional fixed blades is fixed, so that the change of the main direction of fluid flow and the change of each parameter caused by the change of the rotating speed of the variable-rotating-speed centrifugal pump cannot be timely dealt with, the best blade installation angle required by better flow cannot be provided, higher efficiency cannot be always achieved under the condition of any rotating speed, vortex generation can be caused, and vortex noise is aggravated. Meanwhile, for the volute with continuously changed cross-sectional area, parameters such as flow speed and the like on different cross sections are different, and at the moment, different blade attack angles are required to be more suitable, so that different adjustable blades of the variable-rotation-speed pump are required to have different angle change rates according to different blades.
In summary, for the variable rotational speed centrifugal blood pump, to design and optimize a miniature centrifugal blood pump with high efficiency, low noise and low damage to blood cells, secondary flow is controlled and reduced, vortex shedding is prevented or vortex formation is controlled, and the automatic adjustable blade capable of finding the corresponding optimal blade mounting angle according to various variable parameters in the variable rotational speed motion is provided.
Disclosure of Invention
The invention aims at solving the problems that the thickness of a boundary layer, secondary flow and vortex noise in a microminiature blood centrifugal pump cannot be well controlled and an adjustable blade mounting angle blade cannot be obtained for a variable-rotation-speed centrifugal pump in the prior art, and provides a microminiature centrifugal pump with two stages of blades, in particular to a microminiature blood pump with a primary blade suction surface provided with a winglet structure and a secondary impeller provided with an automatic adjusting mounting angle blade.
The invention comprises a front end cover, a rear end cover, a first-stage impeller and a second-stage adjustable blade impeller; the front end cover, the rear end cover, the primary impeller and the secondary adjustable blade impeller are all coaxially arranged. The suction surface of each primary blade of the primary impeller is provided with a winglet at the center in the height direction, and the tail edge of the winglet is level with the tail edge of the primary impeller; the height direction of the winglet is perpendicular to the height direction of the primary blade; the molded line length of the winglet is 10% -15% of the molded line length of the primary blade, and the molded line lengths of the winglets on the primary blades are equal; the cross section of the winglet is an isosceles triangle with three angles with all rounded corners, and the radius of the rounded corners is 0.1-0.2 of the height of the isosceles triangle; the angle of the isosceles triangle at the front edge is the minimum angle, and the minimum angle is 30 degrees; the leading edge of the winglet has an inclination angle of 30 degrees relative to the height direction of the winglet; the thickness of the primary blade is 0.3-0.4 of the tail edge height of the winglet.
The secondary adjustable blade impeller comprises a driving circular ring, a connecting rod, a swinging blade, a cylindrical rod, a secondary blade and a control box. Z is Z 1 The second-stage blades are circumferentially arranged along the impeller of the second-stage adjustable blade, Z 1 N is 1, 2 or 3, and Z is the number of primary blades of the primary impeller. Each secondary blade is fixedly connected with one swing blade through a cylindrical rod, and the axial line of the cylindrical rod is positioned on the centering surface of the secondary blade and the swing blade; round holes formed in the cylindrical rod and the front end cover form rotationThe auxiliary swing blade is positioned outside the front end cover, and the secondary blade is positioned inside the front end cover. Each swing blade is hinged with one end of one connecting rod, and the other ends of all the connecting rods are hinged with the driving circular ring; the inner side of the driving circular ring is provided with a circular arc-shaped rack, and a gear at the output end of the control box is meshed with the circular arc-shaped rack; the central angle corresponding to the circular arc rack is 30-60 degrees. The cylindrical rod is provided with labyrinth seal structure.
The hinged ends of the connecting rods and the driving circular ring are uniformly distributed along the circumferential direction of the driving circular ring; the positions of the hinged ends of the connecting rods and the corresponding swinging blades are specifically calculated as follows:
1) Taking the connecting line of the center of the driving circular ring and the most protruding point of the volute tongue on the volute as a zero-degree line, and taking the direction of gradually increasing the sectional area of the volute as the positive direction of increasing the angle; the volute consists of a front end cover and a rear end cover; the cylindrical rods are arranged at an angle of 15-25 degrees away from the zero-degree line, the position of the first cylindrical rod which forms 45 degrees with the zero-degree line is taken, and the rest cylindrical rods are uniformly distributed along the circumference of the secondary adjustable vane impeller at the back of 15-45 degrees away from the zero-degree line.
2) Taking the largest cross section of the cross sections of the spiral case passing through the central axes of the cylindrical rods as a reference area, and calculating the cross sections of the spiral case passing through the central axes of the cylindrical rods and the reference area.
3) And a dividing point is arranged on the molded line of each swing blade along the direction from the front edge to the tail edge of the swing blade according to the corresponding sectional area ratio of the cylindrical rod at the position of the molded line of each swing blade, and is used as the hinged end of the swing blade and the corresponding connecting rod.
A gasket is arranged between the front end cover and the rear end cover, and the front end cover is connected with the rear end cover through bolts.
The cavity between the front end cover and the end face of the primary impeller is a pumping chamber, and the pumping chamber is the inlet end of blood.
The inner diameter of the driving circular ring is 1.2 times of the inlet radius of the front end cover.
The distance L between the rotation center of the primary impeller and the central axis of the cylindrical rod meets the following formula:
L-R 1 -0.5*L 2 =0.05R 1 ；
wherein L is 2 Is the line length of the secondary blade, R 1 Is the radius of the first-stage impeller.
The labyrinth seal structure comprises two annular groove groups; the annular groove group consists of 6-8 annular grooves which are equidistantly arranged, and the groove width of each annular groove is equal to the interval between every two adjacent annular grooves.
The control box is provided with a rotating speed function of the output end gear rotating at different speeds.
The invention has the beneficial effects that:
according to the invention, the isosceles triangle winglet structure is arranged at the outlet end of the primary fixed blade impeller, so that radial flow caused by unbalanced pressure and centrifugal force of fluid can be well controlled, meanwhile, large channel vortex can be cut and combed, and viscous fluid in a flow channel can be effectively separated and guided, so that the flow is in an ideal flow state, and wake loss and vortex noise of a centrifugal pump are reduced. The size of a pair of channel vortexes in the blade flow channel is controlled, so that secondary flow of radial movement is controlled, speed non-uniformity is reduced, jet flow wake loss is reduced, vortex intensity and flow loss at the tail end of the blade channel are restrained, and vortex shedding is controlled.
The second-stage adjustable vane impeller aims at the periodical changes of speed, pressure and the like caused by the variable rotation speed in the operation process of the blood centrifugal pump, and can select a proper vane attack angle according to the changes of incoming blood, so that the jet flow-wake of an outlet of the first-stage impeller is weakened, the large vortex at the outlet end is weakened, the blood is split and combed again, the large vortex is combed into a small vortex, and the internal flow condition of the blood pump is improved. The second-stage adjustable guide vane is similar to a vane diffuser for the whole blood pump, converts kinetic energy of fluid into useful pressure energy, and further improves the lift of the blood pump, so that the rotating speed of the centrifugal pump can be properly reduced under the same lift, further the centrifugal force received by blood is reduced, and the centrifugal force received by blood cells in the blood is reduced.
The control box inputs and outputs the rotational speed function that the end gear rotates at a different speed in advance, control the end gear according to the change of the function, have guaranteed that the initial angular momentum of adjustable blade on the initiative ring is unanimous, different connecting rod lengths make the rate of change of adjustable blade of different circumference positions different, have further led to different adjustable blades to have the blade rotation quantity that does not use, have obtained different blade attack angles, have solved the demand to the installation angle of adjustable blade under the different condition of the different flow parameters such as different speeds of blood on the spiral case cross-section. The adjustable blade meets the different requirements of the adjustable blades at different circumferential positions on the installation angle of the adjustable blades at different rotating speeds, so that the friction loss of blood is reduced, and meanwhile, the viscous fluid in the flow channel is effectively separated and guided, so that an ideal flowing state is formed, and the noise formed by vortex shedding and vortex breaking is reduced. Meanwhile, the vortex intensity of the centrifugal pump is reduced, dynamic pressure is further reduced, static pressure is improved, and therefore higher efficiency is achieved.
Drawings
FIG. 1 is a perspective view of the structure of the present invention;
FIG. 2 is a block diagram of a primary impeller of the present invention;
FIG. 3 is a block diagram of a primary blade of the present invention;
FIG. 4 is a schematic view of the sealing mode between the cylindrical rod and the front end cover of the present invention;
FIG. 5 is an enlarged view of A-A of FIG. 4;
FIG. 6 is a perspective view of a two-stage adjustable vane impeller of the present invention;
FIG. 7 is a two-dimensional schematic of a two-stage adjustable vane wheel according to the present invention;
fig. 8 is a schematic view showing the distribution of the positions of the hinged ends of each swing blade and the corresponding swing blade according to the present invention.
Description of the embodiments
The invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, a microminiature centrifugal blood pump with self-adjusting blades comprises a front end cover 1, a rear end cover 2, a primary impeller 3 and a secondary adjustable blade impeller 5; a gasket 4 is arranged between the front end cover 1 and the rear end cover 2, and the front end cover 1 and the rear end cover 2 are connected through bolts; the front end cover 1, the rear end cover 2, the primary impeller 3 and the secondary adjustable vane impeller 5 are all coaxially arranged. The cavity between the front end cover 1 and the end face of the primary impeller 3 is a pumping chamber which is the inlet end of blood; the number of primary blades z=5 of the primary impeller 3.
As shown in fig. 2 and 3, the suction surface of each primary blade of the primary impeller 3 is provided with a winglet 3-1 at the center in the height direction, and the tail edge of the winglet is flush with the tail edge of the primary impeller 3; the height direction of the winglet is perpendicular to the height direction of the primary blade; the molded line length of the winglet 3-1 is 10% -15% of the molded line length of the primary blade, and the molded line lengths of winglets on the primary blades are equal; the cross section of the winglet is an isosceles triangle with three angles with all rounded corners, and the radius of the rounded corners is 0.1-0.2 of the height of the isosceles triangle; the angle of the isosceles triangle at the front edge is the minimum angle, and the minimum angle is 30 degrees; the leading edge of the winglet has an inclination delta of 30 degrees relative to the winglet height; the thickness b2 of the primary blade is 0.3-0.4 of the tail edge height b1 of the winglet. The winglet structure is added at the outlet of the impeller runner with larger flow instability, so that the flow condition at the impeller can be improved, the vortex structure at the outlet of the impeller runner is restrained from being generated, the phenomenon of jet flow-wake at the outlet of the impeller runner is restrained, and vortex noise caused by the wake of the impeller is weakened.
As shown in fig. 1, 4, 6 and 7, the secondary adjustable vane impeller 5 comprises a driving circular ring 9, a connecting rod 8, a swinging vane 7, a cylindrical rod 6, a secondary vane 10 and a control box 11.Z is Z 1 The second-stage blades are circumferentially arranged along the second-stage adjustable blade impeller 5, Z 1 N=z, n is 1, 2 or 3, n=1 in this embodiment. Each secondary blade is fixedly connected with one swing blade through a cylindrical rod, and the axial line of the cylindrical rod is positioned on the centering surface of the secondary blade and the swing blade; the cylindrical rod and the round hole formed in the front end cover 1 form a revolute pair, the swing blade is positioned outside the front end cover 1, and the secondary blade is positioned inside the front end cover 1. Each swing blade is hinged with one end of one connecting rod, and the other ends of all the connecting rods are hinged with the driving circular ring; the inner diameter of the driving circular ring is 1.2 times of the inlet radius of the front end cover 1. The inner side of the driving circular ring is provided with a circular arc-shaped rack 9-1, and a gear 11-1 at the output end of the control box is meshed with the circular arc-shaped rack; the central angle theta corresponding to the circular arc-shaped rack is 30-60 degrees, and 30 degrees are adopted in the embodiment. The limitation of the corresponding central angle of the circular arc-shaped rack is performed, so that the limit position of the secondary blade is limited. Because the angle of attack of the secondary blade is adjustable, the embodiment passesThe distance L between the rotation center of the primary impeller and the central axis of the cylindrical rod is ensured to meet the following conditions to ensure that the secondary blade is closely adjacent to but not in contact with the primary blade:
L-R 1 -0.5*L 2 =0.05R 1 ；
wherein L is 2 Is the line length of the secondary blade, R 1 Is the radius of the first-stage impeller.
As shown in fig. 5, the cylindrical rod is provided with a labyrinth-like seal structure, ensuring that viscous blood does not leak. The labyrinth seal structure comprises two annular groove groups; the annular groove group consists of 6-8 annular grooves which are equidistantly arranged, and the groove width of each annular groove is equal to the interval between every two adjacent annular grooves.
As shown in fig. 8, the articulated ends 8-1 of the connecting rods 8 and the driving ring are uniformly distributed along the circumferential direction of the driving ring. The position of the hinged end 8-2 of each connecting rod 8 corresponding to one swinging blade 7 is related to the size of the cross section of the corresponding volute (the front end cover 1 and the rear end cover 2 form the volute) at the position of each cylindrical rod, and the position of the hinged end 8-2 of each connecting rod 8 corresponding to one swinging blade 7 is specifically calculated as follows:
1) The connecting line of the center of the driving circular ring and the most salient point of the volute tongue on the volute is taken as a zero-degree line, and the direction of gradually increasing the sectional area of the volute is taken as the positive direction of increasing the angle. Because the flow of-10 to 20 degrees near the volute tongue is unstable, the cylindrical rods are arranged at an angle of-15 to 25 degrees avoiding the zero-degree line. The number of the cylindrical rods in the embodiment is Z 1 And (5) taking 45 degrees as the position of the first cylindrical rod, and circumferentially uniformly distributing the rest cylindrical rods along the second-stage adjustable blade impeller 5 at the back edge of 15-45 degrees avoiding the zero degree line.
2) Taking the largest cross-sectional area of the cross-sectional areas of the spiral case passing through the central axes of the cylindrical rods as a reference area, the cross-sectional area ratios of the cross-sectional areas of the spiral case passing through the central axes of the cylindrical rods to the reference area in this embodiment are calculated to be 61%, 82%, 84%, 86% and 100%, respectively.
3) Along the direction from the front edge to the tail edge of the swinging blade, a division point is arranged on the molded line of each swinging blade according to the corresponding sectional area ratio of the cylindrical rod at the position, and is used as the hinged end 8-2 of the swinging blade 7 and the corresponding connecting rod 8, namely, the division point on the molded line of the swinging blade at the position with the larger volute sectional area is closer to the tail edge of the swinging blade.
According to the invention, the rotating speed function of the output end gear rotating at different speeds is input into the control box, the output end gear is controlled according to the change of the function, the initial angular momentum of the adjustable blades on the driving circular ring is ensured to be consistent, the different connecting rod lengths enable the change rates of the adjustable blades at different circumferential positions to be different, further different adjustable blades have different blade rotation amounts, different blade attack angles are obtained, and the problem of different flow speeds of the two-stage impeller blades caused by different volute section areas is solved, namely, the rotation angle of each blade is not used for different volute section flow speeds.
Meanwhile, the two-stage blades can play a role in guiding flow to the front pump cavity and the rear pump cavity of the pump body, the guiding flow is carried out on unstable flow of the front cavity and the rear cavity caused by variable-rotation-speed flow, the guiding flow of the blades is achieved, fluid in the front pump cavity and the rear pump cavity of the centrifugal pump can be guided in one guiding direction in advance, viscous fluid is combed, and the flowing condition of the front pump cavity and the rear pump cavity is improved.
The secondary impeller is provided as an impeller with adjustable installation angle blades, the installation angle of the secondary blades is changed in time within a certain range for the speed, the pressure and the shearing force which are continuously changed when the centrifugal pump moves at a variable speed, so that the blood flowing out of the primary blades is converted into potential energy under the flow guidance of the secondary blades, the centrifugal pump always achieves the most beneficial efficiency under any rotating speed, and meanwhile, the secondary blades with airfoil sections can also inhibit the generation of vortex, improve the flow condition and weaken vortex noise.
Claims (7)
1. The utility model provides a microminiature centrifugal blood pump with self-interacting blade, includes front end housing, rear end housing, one-level impeller and second grade adjustable blade impeller, its characterized in that: the front end cover, the rear end cover, the primary impeller and the secondary adjustable blade impeller are all coaxially arranged; the suction surface of each primary blade of the primary impeller is provided with a winglet at the center in the height direction, and the tail edge of the winglet is level with the tail edge of the primary impeller; the height direction of the winglet is perpendicular to the height direction of the primary blade; the molded line length of the winglet is 10% -15% of the molded line length of the primary blade, and the molded line lengths of the winglets on the primary blades are equal; the cross section of the winglet is an isosceles triangle with three angles with all rounded corners, and the radius of the rounded corners is 0.1-0.2 of the height of the isosceles triangle; the angle of the isosceles triangle at the front edge is the minimum angle, and the minimum angle is 30 degrees; the leading edge of the winglet has an inclination angle of 30 degrees relative to the height direction of the winglet; the thickness of the primary blade is 0.3-0.4 of the tail edge height of the winglet;
the secondary adjustable blade impeller comprises a driving circular ring, a connecting rod, a swinging blade, a cylindrical rod, a secondary blade and a control box; z is Z 1 The second-stage blades are circumferentially arranged along the impeller of the second-stage adjustable blade, Z 1 N is 1, 2 or 3, Z is the number of primary blades of the primary impeller; each secondary blade is fixedly connected with one swing blade through a cylindrical rod, and the axial line of the cylindrical rod is positioned on the centering surface of the secondary blade and the swing blade; the cylindrical rod and the round hole formed in the front end cover form a revolute pair, the swing blade is positioned outside the front end cover, and the secondary blade is positioned inside the front end cover; each swing blade is hinged with one end of one connecting rod, and the other ends of all the connecting rods are hinged with the driving circular ring; the inner side of the driving circular ring is provided with a circular arc-shaped rack, and a gear at the output end of the control box is meshed with the circular arc-shaped rack; the central angle corresponding to the circular arc-shaped rack is 30-60 degrees; the cylindrical rod is provided with a labyrinth sealing structure;
the hinged ends of the connecting rods and the driving circular ring are uniformly distributed along the circumferential direction of the driving circular ring; the positions of the hinged ends of the connecting rods and the corresponding swinging blades are specifically calculated as follows:
1) Taking the connecting line of the center of the driving circular ring and the most protruding point of the volute tongue on the volute as a zero-degree line, and taking the direction of gradually increasing the sectional area of the volute as the positive direction of increasing the angle; the volute consists of a front end cover and a rear end cover; the cylindrical rods are arranged at an angle of 15-25 degrees avoiding the zero degree line, the position forming 45 degrees with the zero degree line is taken as the first cylindrical rod, and the rest cylindrical rods are uniformly distributed along the circumference of the secondary adjustable vane impeller after avoiding the zero degree line of 15-45 degrees;
2) Taking the largest cross section of the cross sections of the spiral case passing through the central axes of the cylindrical rods as a reference area, and calculating the cross sections of the spiral case passing through the central axes of the cylindrical rods and the reference area;
3) And a dividing point is arranged on the molded line of each swing blade along the direction from the front edge to the tail edge of the swing blade according to the corresponding sectional area ratio of the cylindrical rod at the position of the molded line of each swing blade, and is used as the hinged end of the swing blade and the corresponding connecting rod.
2. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: a gasket is arranged between the front end cover and the rear end cover, and the front end cover is connected with the rear end cover through bolts.
3. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: the cavity between the front end cover and the end face of the primary impeller is a pumping chamber, and the pumping chamber is the inlet end of blood.
4. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: the inner diameter of the driving circular ring is 1.2 times of the inlet radius of the front end cover.
5. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: the distance L between the rotation center of the primary impeller and the central axis of the cylindrical rod meets the following formula:
L-R 1 -0.5*L 2 =0.05R 1 ；
wherein L is 2 Is the line length of the secondary blade, R 1 Is the radius of the first-stage impeller.
6. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: the labyrinth seal structure comprises two annular groove groups; the annular groove group consists of 6-8 annular grooves which are equidistantly arranged, and the groove width of each annular groove is equal to the interval between every two adjacent annular grooves.
7. A miniature centrifugal blood pump with self-regulating vanes according to claim 1, wherein: the control box is provided with a rotating speed function of the output end gear rotating at different speeds.
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| CN201710307309.9A CN107050543B (en) | 2017-05-04 | 2017-05-04 | Microminiature centrifugal blood pump with self-adjusting blades |
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| CN201710307309.9A CN107050543B (en) | 2017-05-04 | 2017-05-04 | Microminiature centrifugal blood pump with self-adjusting blades |
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| CA3066361A1 (en) | 2017-06-07 | 2018-12-13 | Shifamed Holdings, Llc | Intravascular fluid movement devices, systems, and methods of use |
| CN111556763B (en) | 2017-11-13 | 2023-09-01 | 施菲姆德控股有限责任公司 | Intravascular fluid movement device and system |
| EP3746149A4 (en) | 2018-02-01 | 2021-10-27 | Shifamed Holdings, LLC | Intravascular blood pumps and methods of use and manufacture |
| CN110345082B (en) * | 2019-07-11 | 2024-04-05 | 浙江理工大学 | Impeller timing sequence angle and span adjustable two-stage centrifugal pump device and method |
| 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 |
| US11724089B2 (en) | 2019-09-25 | 2023-08-15 | Shifamed Holdings, Llc | Intravascular blood pump systems and methods of use and control thereof |
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