CN111773460A - Blood pump rotor - Google Patents
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- CN111773460A CN111773460A CN202010539721.5A CN202010539721A CN111773460A CN 111773460 A CN111773460 A CN 111773460A CN 202010539721 A CN202010539721 A CN 202010539721A CN 111773460 A CN111773460 A CN 111773460A
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Abstract
The invention discloses a blood pump rotor. This blood pump rotor includes: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which are distributed along the axial direction of the cylindrical rotating shaft and are integrally and smoothly connected; the blade is connected to the periphery of the cylindrical rotating shaft based on a blade root with a mixed flexible part and a hard part; the elastic modulus of the material of the flexible part is smaller than that of the material of the hard part; when the cylindrical rotating shaft rotates, the pumping object can exert a reaction thrust on the blade, the flexible part of the blade deforms to enable the whole blade to bend along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade. Because the blades are formed by the flexible parts and the hard parts in a crossed mode or in a partially crossed mode along the axial direction of the rotating shaft, the physiological indexes of blood cannot be damaged in the rotating process of the pump.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a blood pump rotor.
Background
At present, when a large-scale operation particularly relates to a heart operation, the operation of the heart is ensured, and simultaneously, the blood of a medical object is enabled to operate normally, so that the normal circulation of the blood of the medical object is ensured, and the medical object maintains normal vital signs.
At present, a blood pump device is commonly used for promoting the normal circulation of blood of a medical object in an operation, namely, one end of the blood pump device, provided with a blood pump, is inserted into a ventricle of the medical object, the other end of the blood pump device is inserted into an artery of a heart, and the blood in the ventricle of the heart is pumped into the artery of the medical object through the operation of the blood pump, so that the normal blood circulation of the medical object is ensured, and the blood of the medical object can still normally circulate when the heart-related operation is performed on the medical object.
However, in the blood pump of the current blood pump device, because blood needs to be pumped, the requirement on the pump, particularly the rotor of the pump, is particularly high, and it is necessary to ensure not only the operating efficiency of the rotor of the blood pump, but also the physiological index of the pumping object, i.e. blood, not to be affected. Here, the physiological index of blood mainly includes main indexes such as a leukocyte index, an erythrocyte index, a hemoglobin index, a serum-bound globin index, and a platelet index. The blood pump can also affect physiological indexes in the blood while pumping the blood in the high-speed rotating process, for example, the cell walls of red blood cells in the blood can be damaged in the high-speed rotating process of blades of a rotor of the blood pump, and after the cell walls of a large number of red blood cells in the blood are damaged, the hemolytic effect of the blood can be caused, so that a medical object is in hemolytic complications and seriously threatens life.
The blood pump device is mainly characterized in that the blood pump in the existing blood pump device is smaller in volume because the blood pump is to be placed in the body of a medical object, the blood pump generally focuses on the working efficiency of the blood pump, and the physiological indexes of the blood of the pumping object of the blood pump are less focused. However, since the blood pump device directly acts on the blood of the medical subject, it is inevitable to damage the blood accordingly, and for some medical subjects with poor hemolysis tolerance, especially for the medical subjects with complications, the slight change of the blood physiological index is fatal for the medical subjects with complications. Unfortunately, the pumping efficiency of the blood pump and the size of the blood pump are all concerned by the current blood pump devices, and the blood pump devices have little attention to the physiological index of blood.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a blood pump rotor capable of pumping sufficient blood for a medical subject, and hardly damaging various physiological indexes of the blood.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a blood pump rotor, comprising: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which are distributed along the axial direction of the cylindrical rotating shaft and are integrally and smoothly connected; the blade is connected to the periphery of the cylindrical rotating shaft based on a blade root with a mixed flexible part and a hard part;
the elastic modulus of the material of the flexible part is smaller than that of the material of the hard part;
when the cylindrical rotating shaft rotates, the pumping object can exert a reaction thrust on the blade, the flexible part of the blade deforms to enable the whole blade to bend along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade.
As one implementation mode, the elastic modulus of the material of the flexible part is 8Mpa to 80 Mpa; the hard portion is made of a material having an elastic modulus of 35 to 195 MPa.
In one implementation, the flexible portion includes two or more different material sections, and the hard portion includes two or more different material sections;
the flexible parts and the hard parts are alternately arranged and distributed at intervals along the axial direction of the cylindrical rotating shaft; alternatively, the first and second electrodes may be,
the flexible parts and the hard parts are sequentially arranged and distributed along the axial direction of the cylindrical rotating shaft according to the sequence of the elastic modulus of the materials from large to small or from small to large; alternatively, the first and second electrodes may be,
the flexible parts are positioned at the two ends of the blade and the hard parts are positioned in the middle of the blade and distributed in an arrangement way along the axial direction of the cylindrical rotating shaft; alternatively, the first and second electrodes may be,
the hard parts are positioned at two ends of the blade and the flexible parts are positioned in the middle of the blade and distributed in an arrangement way along the axial direction of the cylindrical rotating shaft.
As one implementation mode, the flexible part comprises one material section, and the hard part comprises more than two different material sections;
the flexible parts are distributed in a manner of being clamped in the hard parts of more than two different material sections; alternatively, the first and second electrodes may be,
the flexible parts are distributed on one side of the hard parts of more than two different material sections.
As one implementation mode, the flexible part comprises more than two material sections, and the hard part comprises one material section;
the hard parts are distributed in the flexible parts which are clamped in more than two different material sections; alternatively, the first and second electrodes may be,
the hard parts are distributed on one side of the flexible parts of more than two different material sections.
As one implementation, the ratio of the lengths of the flexible portion and the hard portion in the axial direction of the cylindrical rotating shaft is 1:3 to 6: 1.
As one implementation mode, the length ratio of the flexible portion and the hard portion of the blade in the axial direction of the cylindrical rotating shaft is: 3:8, 1:1, 2:1, 100:37, 28:9, 24:7, or 17: 4.
As one implementation, the blades are 1 to 6.
As an implementation manner, when the number of the blades is 1, the blades are wound on the periphery of the other end of the cylindrical rotating shaft from the periphery of one end of the cylindrical rotating shaft in a manner of moving towards the other end of the cylindrical rotating shaft; the number of the circumference of the blade around the cylindrical rotating shaft is 0.2 to 5.
As an implementation manner, when the number of the blades is 2 to 6, the blades move from the bisector at the circumference of one end of the cylindrical rotating shaft to the other end of the cylindrical rotating shaft, and each blade is wound around the corresponding bisector at the circumference of the other end of the cylindrical rotating shaft in a parallel manner; the number of the circumference of the blade around the cylindrical rotating shaft is 0.1 to 5.
The invention has the beneficial effects that:
according to the blood pump rotor structure, the blade part of the blood pump rotor is made of flexible materials, the blade is provided with a flexible part and a hard part, and the flexible part and the hard part are distributed along the axial direction of the cylindrical rotating shaft and are connected smoothly and integrally; the elastic modulus of the material of the flexible portion is smaller than that of the material of the hard portion. According to the embodiment of the invention, the material of the blades of the blood pump rotor is correspondingly selected, so that the flexible part of the blood pump rotor is deformed and bent when the blood pump rotor rotates, the flexible part and the hard part are arranged in a crossed manner or partially crossed manner along the axial direction of the rotating shaft, the bending of the flexible part can drive the hard part to deform along with the bending, and the blades of the blood pump rotor are provided with the flexible part, so that the blades of the blood pump rotor are subjected to bending deformation when the blood is pumped in the pump rotating process, the damage to the physiological indexes of the blood is small, particularly the damage to red blood cells in the blood is hardly caused, and in addition, the influence on other physiological indexes in the blood is hardly caused. Therefore, the blade design in the blood pump rotor provided by the embodiment of the invention can ensure the physiological index of pumped blood, and can be suitable for any medical object, especially for the medical object with complications.
Drawings
Fig. 1 is a schematic structural diagram of a blood pump rotor according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the rotor and blades of the blood pump according to the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of the rotor and blades of the blood pump according to the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the rotor and blades of the blood pump according to the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of the rotor and blades of the blood pump according to the embodiment of the present invention.
Fig. 6 is a schematic structural diagram of the rotor and blades of the blood pump according to the embodiment of the present invention.
Fig. 7 is a schematic view of the design of a cylindrical rotating shaft of a blade of a blood pump rotor according to an embodiment of the invention.
FIG. 8 is a profile of blade angle versus stroke for a blood pump rotor according to an embodiment of the present invention.
Fig. 9 is a design curve diagram of a cylindrical rotating shaft of a blood pump rotor according to an embodiment of the invention.
Detailed Description
The essence of the technical solution of the embodiments of the present invention is explained in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a blood pump rotor according to the present invention, and as shown in fig. 1, the blood pump rotor according to the present invention includes: a cylindrical rotating shaft 10 and a vane 20.
Fig. 2 is a schematic structural diagram of a blade of a blood pump rotor according to an embodiment of the present invention, and as shown in fig. 2, the blade 20 according to an embodiment of the present invention has a flexible portion 201 and a hard portion 202, and the flexible portion 201 and the hard portion 202 are distributed along an axial direction of the cylindrical rotating shaft 10 and are integrally and smoothly connected; the blade 20 is connected to the periphery of the cylindrical rotating shaft 10 based on the blade root of the mixture of the flexible part 201 and the hard part 202;
in the embodiment of the present invention, the elastic modulus of the material of the flexible portion 201 is 8Mpa to 80 Mpa; the elastic modulus of the material of the hard portion 202 is 35Mpa to 195Mpa, and the elastic modulus of the material of the flexible portion 201 is smaller than that of the material of the hard portion 202;
when the cylindrical rotating shaft 10 rotates, a pumping object can apply a reaction thrust to the blade 20, the flexible portion 201 of the blade 20 deforms to bend the whole blade 20 along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade.
As one mode of implementation, in the blood pump rotor according to the embodiment of the present invention, a length ratio of the flexible portion to the rigid portion in an axial direction of the cylindrical rotating shaft is 1:3 to 6: 1. Preferably, the length ratio of the flexible portion 201 to the hard portion 202 in the axial direction of the cylindrical rotating shaft is 3:8, 1:1, 2:1, 100:37, 28:9, 24:7 or 17: 4.
In the blood pump rotor of the embodiment of the invention, the material of the blades 20 is selected correspondingly, so that the flexible part of the blood pump rotor is deformed and bent when the blood pump rotor rotates, the flexible part 201 and the hard part 202 are arranged in a crossed manner or in a partially crossed manner along the axial direction of the rotating shaft, the bending of the flexible part 201 can drive the hard part 202 to deform along with the bending, and the blades 20 of the blood pump rotor are provided with the flexible part 201, so that the blades 20 of the blood pump rotor have bending deformation when pumping blood in the pump rotating process, which causes little damage to the physiological indexes of the blood, especially red blood cells in the blood, hardly damage the red blood cells in the blood, and hardly has any influence on other physiological indexes in the blood.
Hemolysis refers to a phenomenon in which red blood cells in blood are broken, and hemoglobin in the red blood cells overflows and dissolves in the blood. Hemolysis can result in changes in the morphological and biochemical properties of red blood cells, a shortened lifespan, and even complete rupture of red blood cells, which can reduce the ability of red blood cells to deliver oxygen to tissues and organs. In addition, the plasma free hemoglobin concentration increases after hemolysis, and the excess free hemoglobin needs to be excreted through the kidney, thus possibly leading to impaired renal function and multiple organ failure. In the embodiment of the invention, the blood volume estimation is to establish a hemolysis model suitable for a complex flow field through reasonable assumption and deformation according to the quantitative relation between the flow parameters in the cylindrical single flow field and the hemolysis destruction volume obtained by experimental measurement. Currently, most studies for quantitative hemolysis estimation are based on power law equations. The power law equation describes the index of Hemolysis (HI) and shear (τ) in a simple flow field, the exposure time (t)exp) The relationship of (1):
wherein the haemolytic index HI is defined as the ratio of the increase in plasma free haemoglobin concentration (Δ Hb) to the haemoglobin concentration in whole blood (Hb). C. α and β are constants obtained by regression analysis of experimental data.
In summary, the amount of hemolysis is related to the shearing force and the exposure time, when the blade 20 is designed by the structure proposed in the embodiment of the present invention, and a part of the blade tip of the blade 20 is made of a flexible material, the rotor blade 20 will bend in the direction opposite to the rotation direction, so that the speed distribution at the blade tip is improved, thereby reducing the shearing force at the blade tip position and reducing the possibility of hemolysis of blood at the blade tip position.
In addition, the design of the blood pump rotor structure provided by the embodiment of the invention can also avoid the formation of thrombus. The formation, movement and the relation between the thrombus and the hemodynamics are always the research focus, and the formation and development of the thrombus are influenced by various factors, such as blood flow dynamics factors such as blood wall surface shearing force and wall surface pressure, and body fluid factors such as active growth media and inflammatory media in blood vessels. The blood flow rate, viscosity, shape and stenosis of blood vessels in blood vessels all have important effects on the formation, distribution and movement of thrombus. Such as mural thrombus on a blood vessel, slowly calcify and even cause obstruction of the blood vessel; smaller thrombi can flow in the human body along with blood, and tiny blood vessels are blocked at narrow parts to generate pathological changes. Therefore, the method has a certain significance for preventing and treating the thrombus by deeply understanding the correlation between the hemodynamics and the thrombus and analyzing the changes of the wall surface shearing force and the pressure on the blood vessel wall.
The interaction between blood cells, mainly between platelets and blood coagulation proteins, leads to thrombosis of the diseased portion of the artery. This process often causes changes in the surface properties of the vessel wall, such as atherosclerotic lesions. Increased blood flow disturbances, procoagulant factors, and platelet count and hematocrit may accelerate thrombus formation. Taking into account the interaction between blood and thrombus, a mathematical model of blood (red blood cells and plasma) was introduced, and the incompressible flow equation was written as:
wherein vfIndicating the blood velocity, TfIs the stress tensor of the fluid, pfIs the density of blood, bfIs volume force vТSpeed of thrombus, C21e9 is the resistance coefficient and phi is the volume fraction of platelets deposited.
In the mathematical model of thrombus (platelet), the chemical and biological material reaction processes of platelet deposition are described by the convection-diffusion-reaction equation as follows:
wherein D isiRefers to the diffusion coefficient of material i, [ C ] in bloodi]Is the concentration of material i, SiIs the chemical reaction source item of the material i.
In summary, the interaction between blood cells at a stenosis is a major cause of thrombosis. In the blade 20 structure of the embodiment of the present invention, by the way that the flexible portion 201 and the hard portion 202 are arranged in a crossed or partially crossed manner, when the blade 20 of the blood pump rotor pumps blood, because the blade 20 is made of a flexible material, the size of the angular region between the blade and the rotating shaft can be changed by bending the blade at the root when the blood pump rotor rotates, so that no blood deposits or adheres to the narrow position of the angular region between the blade 20 of the blood pump rotor and the rotating shaft, thereby reducing the generation of thrombus at the angular region between the blade root and the rotating shaft.
In the embodiment of the present invention, the flexible portion 201 includes more than two different material sections, and the hard portion 202 includes more than two different material sections; the flexible parts 201 and the hard parts 202 are alternately arranged and distributed at intervals along the axial direction of the cylindrical rotating shaft; the blade structure of the blood pump rotor is shown in figures 3 and 4.
Or, the flexible portion 201 and the hard portion 202 are sequentially arranged and distributed along the axial direction of the cylindrical rotating shaft 10 in the order of the elastic modulus of the material from large to small or from small to large; that is, the flexible portions 201 of the two or more different material segments and the hard portions 202 of the two or more different material segments are sequentially arranged and distributed in the order of increasing elastic modulus or decreasing elastic modulus. This kind of blade based on elastic modulus's size carries out sequencing, when the blood pump rotor carries out the blood pumping, because the blade is ordered according to the elastic modulus's of material size, like this, at the rotatory in-process of blood pump rotor, can have great deformation relatively, like this, protect the red blood cell in the blood, blood pump rotor blade can not have any destruction to the composition of blood when the pump sending blood nearly, thereby guarantee that blood pump rotor guarantees that each item index of blood is unanimous before the pump sending when the pump sending blood, guarantee the quality of pump sending blood.
Or, along the axial direction of the cylindrical rotating shaft 10, the flexible portions 201 are located at both ends of the blade 20, and the hard portions 202 are located in the middle of the blade 20 and are distributed in an array; see the configuration of the blades 20 of the blood pump rotor shown in figure 6. In the blade structure in this example, the hard portion 202 is disposed at the middle position of the blade 20, so that the overall hardness of the blade 20 can be relatively high, and the pumping efficiency of the pump blade 20 of the blood pump rotor can be relatively high, and the flexible portions 201 at the two ends of the blade 20, which are the main contact surfaces for pumping blood, i.e., the two end portions of the pump blade 20 have a larger acting force on blood, so that the relevant components in the pumped blood can be protected, and red blood cells and the like can be prevented from being damaged by the blade 20 of the blood pump rotor.
Or, along the axial direction of the cylindrical rotating shaft 10, the hard portions 202 are located at both ends of the blades 20, and the flexible portions 201 are located at the middle portions of the blades 20, which are distributed in an array, see the structure of the blades 20 of the blood pump rotor shown in fig. 5. In the vane structure in this example, the hard portions 202 are provided at both ends of the vane 20, so that the overall hardness of the vane 20 is relatively low, the pump vane 20 of the blood pump rotor can ensure that the blood phase of blood is not damaged when pumping blood, and the red blood cells and the like are prevented from being damaged by the vane 20 of the blood pump rotor, so that the hemolysis phenomenon does not occur when pumping blood.
In the embodiment of the present invention, the pumping efficiency of the blood pump rotor and the protection of the blood phase of the blood are considered, so that when the blade 20 of the blood pump rotor is manufactured, the flexible portion 201 and the hard portion 202 having a small difference in elastic modulus can be selected as much as possible based on the elastic moduli of the flexible portion 201 and the hard portion 202; in addition, the length ratio of the flexible portion 201 made of different materials in the axial direction of the rotating shaft of the blood pump rotor and the length ratio of the hard portion 202 made of different materials in the axial direction of the rotating shaft of the blood pump rotor need to be considered.
In the embodiment of the present invention, the flexible material for manufacturing the flexible portion 201 has a certain elasticity requirement, and the material has a certain elasticity and flexibility, wherein the elastic modulus of the material of the flexible portion 201 is 8Mpa to 80 Mpa; the material of the hard portion 202 has an elastic modulus of 35Mpa to 195Mpa, and the material of the flexible portion 201 has an elastic modulus lower than that of the hard portion 202.
In the embodiment of the present invention, although the smaller the elastic modulus of the selected material is, the better the material is, the pumping efficiency of the blood pump rotor should be considered, so that the pumping efficiency should be ensured to be as high as possible on the premise of not damaging the physiological indexes of the pumping object, such as blood. In the experiment for the flexible material, the elastic modulus of the material of the flexible portion 201 is preferably 45.7Mpa to 51.6 Mpa. When the flexible material is in the elastic modulus interval, the damage to the physiological indexes of the pumping objects such as blood is small, and the pumping efficiency of the blood pump rotor can be ensured. For example, when the flexible material with the elastic modulus of 45.7Mpa to 51.6Mpa is adopted, the pumping efficiency of the blood pump rotor in the embodiment of the invention can reach 90.3% of that of the fully-rigid pump blade, the pumping efficiency of the blood pump rotor is not obviously reduced, and for a pumped object such as blood, the damage of red blood cells is hardly seen in sampling at the end of a target direction, so that the occurrence of hemolysis is basically avoided. In addition, no destruction was observed in the target blood in the leukocyte index, hemoglobin index, serum-bound globin index, platelet index, and the like.
In addition, with the blade 20 structure of the blood pump rotor shown in fig. 3 and 4, when the flexible portions 201 and the rigid portions 202 are arranged crosswise along the axial direction of the rotating shaft, the length ratio between the adjacent rigid portions 202 and the flexible portions 201 along the axial direction of the rotating shaft is preferably 1:3 to 2:9, and the ratio of the rigid portions 202 to the flexible portions 201 can be smaller, so that the pumping efficiency of the blood pump rotor can be ensured, and the blood phase quality of pumped blood can also be protected.
In addition, with the blade 20 structure of the blood pump rotor shown in fig. 5, when the hard portions 202 are disposed at both ends of the blade 20 and the flexible portion 201 is disposed at the middle portion of the blade 20, the length ratio between the hard portions 202 and the flexible portion 201 in the axial direction of the rotating shaft may be larger, for example, the length ratio between the hard portions 202 and the flexible portion 201 in the axial direction of the rotating shaft is preferably 3:5 to 1:3, which enables the pumping efficiency of the blood pump rotor to be larger.
In addition, with the blade 20 structure of the blood pump rotor shown in fig. 6, when the hard portion 202 is disposed in the middle of the blade 20 and the flexible portions 201 are disposed at the two ends of the blade 20, the length ratio between the hard portion 202 and the flexible portions 201 in the axial direction of the rotating shaft may be smaller, for example, the length ratio between the hard portion 202 and the flexible portions 201 in the axial direction of the rotating shaft is preferably 1:4 to 1:5, so that not only the pumping efficiency of the blood pump rotor can be ensured, but also the blood phase quality of pumped blood can be protected.
As one implementation manner, the flexible portion 201 of the embodiment of the present invention includes one material segment, and the hard portion 202 includes more than two different material segments;
the flexible parts 201 are distributed in a manner of being clamped in the hard parts 202 made of more than two different material sections; with this configuration, the flexible portion 201 of the blade 20 may have a relatively large length ratio in the axial direction of the rotation shaft, and for example, the length ratio between the hard portion 202 and the flexible portion 201 in the axial direction of the rotation shaft is preferably 1:2 to 1: 3.
Alternatively, the flexible portions 201 may be distributed on one side of the hard portions 202 of two or more different material segments. With this structure, the length ratio between the hard portion 202 and the flexible portion 201 of the blade 20 in the axial direction of the rotating shaft is preferably 1:3 to 1: 4.
The flexible portion 201 includes two or more material sections, and the hard portion 202 includes one material section.
The hard parts 202 are distributed in a manner of being clamped in the flexible parts 201 made of more than two different material sections; with this structure, the length ratio between the hard portion 202 and the flexible portion 201 of the blade 20 in the axial direction of the rotation shaft may be smaller, for example, preferably 1:3 to 1: 5.
Alternatively, the hard portions 202 may be distributed on one side of the flexible portion 201 of two or more different material segments. With this configuration, the flexible portion 201 of the blade 20 may have a relatively large length ratio in the axial direction of the rotation shaft, and for example, the length ratio between the hard portion 202 and the flexible portion 201 in the axial direction of the rotation shaft is preferably 1:2 to 1: 3.
In one embodiment, the elastic modulus of the material of the flexible portion 201 in the embodiment of the present invention is preferably between 47.93Mpa and 48.67 Mpa.
In the embodiment of the present invention, the material of the flexible portion 201 is not required to be hard, and may be an alloy material satisfying the above elastic modulus requirement, or a material such as a resin, a synthetic resin, or a mixed resin satisfying the above elastic modulus requirement. In an embodiment of the present invention, the flexible material of the flexible portion is preferably a resin material.
In the embodiment of the present invention, there is no requirement for the material of the hard portion 202, as long as the material of the hard portion 202 has a higher elastic modulus than the material of the flexible portion 201. The difference between the elastic modulus of the material of the hard portion 202 and the elastic modulus of the material of the flexible portion 201 is preferably 40Mpa to 60Mpa under the condition that the integral processing of the hard portion 202 and the flexible portion 201 is ensured. In the embodiment of the present invention, when the flexible portion 201 is made of resin, the hard portion 202 is preferably made of resin with higher hardness. When the flexible portion 201 is made of an alloy, the hard portion 202 is preferably made of an alloy or a metal having a higher hardness.
In the embodiment of the present invention, when the cylindrical rotating shaft 10 rotates, a pumping object can apply a reaction thrust to the blade 20, the flexible portion 201 of the blade 20 deforms to bend the entire blade 20 along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade.
In the embodiment of the present invention, as an implementation manner, the number of the blades is 1 to 6.
When the number of the blades 20 is 1, the blades 20 are wound around the periphery of the other end of the cylindrical rotating shaft 10 from the periphery of one end of the cylindrical rotating shaft 10 in a manner of moving towards the other end of the cylindrical rotating shaft 10; the number of the circumference of the blade 20 around the cylindrical rotating shaft 10 is 0.2 to 5. When the number of the blades 20 is 1, the number of the blades 20 wound around the circumference of the cylindrical rotating shaft 10 is preferably one or more, and the larger the number of the blades 20 wound around the circumference of the cylindrical rotating shaft 10 is, the higher the pumping efficiency is.
It should be noted that, in the embodiment of the present invention, although the blades 20 adopt the design manner of the flexible portion 201, the blade design in the blood pump rotor structure of the embodiment of the present invention still needs to adopt the design principle of the common blood pump rotor blades, that is, the pump input angle and the pump output angle need to be set. According to the embodiment of the invention, the blades 20 are designed to be partially flexible parts, so that the input angle and the output angle of the blades of the blood pump rotor can be partially replaced, namely, the angle of the blades of the blood pump rotor is slightly smaller than that of the blades of the conventional blood pump rotor, so that the flexible parts 201 of the blades 20 are deformed to achieve the effect completely same as that of the blades of the conventional blood pump rotor.
As one way of achieving the above, in the embodiment of the present invention, as shown in fig. 1, when the blades 20 of the blood pump rotor are 2 to 6, the blades 20 move from the bisector at the circumference of one end of the cylindrical rotating shaft 10 to the other end of the cylindrical rotating shaft, and each blade 20 winds around the corresponding bisector at the circumference of the other end of the cylindrical rotating shaft 10 in a parallel manner; the number of the circumference of the blade 20 around the cylindrical rotating shaft is 0.1 to 5.
FIG. 7 is a schematic view of the design of the cylindrical rotating shaft of the blades of the rotor of the blood pump according to the embodiment of the invention, as shown in FIG. 7, the diameter D of the shell of the impeller is determined2The range is less than 10mm, 6mm is taken as the embodiment of the invention, the hub ratio range is approximately 0.15-0.75, 0.367 is taken as the embodiment of the invention, and the diameter D of the blade root is obtained12.2mm, the blade length L is defined as the ratio of the blade length at the blade root to the diameter of the housing is approximately 1-2, here 1.333, so the blade length is 8mm, the ratio of the blade outlet height b to the housing diameter is approximately 0.25-1.5, in the embodiment of the invention 0.4167, so the outlet length is 2.5 mm.
FIG. 8 is a distribution plot of the blade angle of a blood pump rotor according to an embodiment of the present invention, as shown in FIG. 8, the outlet angle β of the blades is the same for each layer, and is in the range of approximately 30 to 90 from the circumferential direction (60 for an embodiment of the present invention). The inlet setting angle α for each layermAnd β, configuring the blade angle phi to be distributed along the way, wherein the blade angle is from α along the axial directionmTo β, obtaining blade centerlines for each layer, thereby obtainingThe wrap angles of the obtained blade around the shaft can be different in each layer, but are not less than 90 degrees, the absolute value of the difference of the different wrap angles on all the layers does not exceed 20 degrees at most, and the blade profiles are bendable as a result of the different wrap angles.
The blade curve on each layer is formed by superposing thickness distribution on the center line, and the thickness range of each layer is not more than 1.5mm (the maximum thickness of the blade root is 0.8mm, and the maximum thickness of the blade tip is 0.5mm in the embodiment). And (5) stacking the n layers of blade curves to obtain a three-dimensional blade profile, and finishing the blade design.
FIG. 9 is a graph showing the design of the cylindrical rotating shaft of the blood pump rotor according to the embodiment of the present invention, as shown in FIG. 9, the length of the cylindrical rotating shaft is l when the cylindrical rotating shaft is taken at the front and back of the blade front edge1The range of 0-4 mm (0.95 mm in the embodiment of the invention), and the distance D from the rotation center1A constant straight line L1, when1At 0, the start and end points of the curves coincide, at the position of the leading edge of the blade. Constructing a streamline curve L2 at the starting point of L1, and gradually increasing the distance from the rotating center to the upstream in the axial direction1Reduced to 0, axial length l2. Starting at the downstream termination point of L1, curve L3 is constructed, gradually expanding in distance from the center of rotation axially downstream, reaching a maximum distance D at the blade root3/2，D3Not exceeding the diameter of the blade rotor (in the present embodiment, D)3Take 5.6 mm). The oblique angle theta of the rotating shaft at the downstream termination point of L1 is 0 deg., and at the maximum distance, the oblique angle theta of the rotating shaft is 20-90 deg. (50 deg.), and the two angles are the tangent angle of the beginning and end points of the L3 curve and the axial length L3. The three curves are connected and then rotated for one circle to obtain a rotating shaft entity, the influence of processing precision is considered, the maximum diameter circle can be made into a boss with the thickness tau, the thickness is not more than 0.5mm, and the axial length of the rotating shaft is l1+l2+l3And the length of the positive tau is 1.1-2 times of the axial length of the blade (1.5 times of the length of the blade in the embodiment of the invention, and the length of the blade is 12 mm). The cylindrical rotating shaft 10 design is completed.
According to the blood pump rotor structure provided by the embodiment of the invention, the blade part of the blood pump rotor is made of flexible materials, the blade is provided with a flexible part and a hard part, and the flexible part and the hard part are integrally and smoothly connected; the flexible parts of the blades are fixed on the periphery of the cylindrical rotating shaft so that the blades are distributed on the periphery of the cylindrical rotating shaft; the elastic modulus of the material of the flexible portion is smaller than that of the material of the hard portion. According to the embodiment of the invention, the blades of the blood pump rotor are deformed and bent when the blood pump rotor rotates by correspondingly selecting the materials of the blades of the blood pump rotor, and the bent blades form the blades of the blood pump rotor to pump blood to a target direction. In the embodiment of the invention, the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, and the flexible part is naturally deformed by the reaction force of the pumping object along the rotating direction when the rotor rotates, so that the pump blade of the pump is formed. In addition, because the blade part of the blood pump rotor is made of flexible materials, in the rotating process of the pump, the blade of the blood pump rotor can be bent and deformed when the blood is pumped, the damage to the physiological indexes of the blood is small, and red blood cells are hardly damaged, so that the physiological indexes of the pumped blood can be ensured, and the blood pump rotor can be suitable for any medical objects, particularly the medical objects with complications.
Furthermore, the features and benefits of the present invention are described with reference to exemplary embodiments. Accordingly, the invention is expressly not limited to these exemplary embodiments illustrating some possible non-limiting combination of features which may be present alone or in other combinations of features.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (10)
1. A blood pump rotor, comprising: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which are distributed along the axial direction of the cylindrical rotating shaft and are integrally and smoothly connected; the blade is connected to the periphery of the cylindrical rotating shaft based on a blade root with a mixed flexible part and a hard part;
the elastic modulus of the material of the flexible part is smaller than that of the material of the hard part;
when the cylindrical rotating shaft rotates, the pumping object can exert a reaction thrust on the blade, the flexible part of the blade deforms to enable the whole blade to bend along the direction of the reaction thrust, and the pumping object is pumped to a target direction under the driving of the bent blade.
2. The blood pump rotor of claim 1, wherein the flexible portion is made of a material having an elastic modulus of 8Mpa to 80 Mpa; the hard portion is made of a material having an elastic modulus of 35 to 195 MPa.
3. The blood pump rotor of claim 1, wherein said flexible portion comprises more than two different material sections and said rigid portion comprises more than two different material sections;
the flexible parts and the hard parts are alternately arranged and distributed at intervals along the axial direction of the cylindrical rotating shaft; alternatively, the first and second electrodes may be,
the flexible parts and the hard parts are sequentially arranged and distributed along the axial direction of the cylindrical rotating shaft according to the sequence of the elastic modulus of the materials from large to small or from small to large; alternatively, the first and second electrodes may be,
the flexible parts are positioned at the two ends of the blade and the hard parts are positioned in the middle of the blade and distributed in an arrangement way along the axial direction of the cylindrical rotating shaft; alternatively, the first and second electrodes may be,
the hard parts are positioned at two ends of the blade and the flexible parts are positioned in the middle of the blade and distributed in an arrangement way along the axial direction of the cylindrical rotating shaft.
4. The blood pump rotor of claim 1, wherein said flexible portion comprises a section of one material and said rigid portion comprises more than two sections of different materials;
the flexible parts are distributed in a manner of being clamped in the hard parts of more than two different material sections; alternatively, the first and second electrodes may be,
the flexible parts are distributed on one side of the hard parts of more than two different material sections.
5. The blood pump rotor of claim 1, wherein said flexible portion comprises more than two material segments and said rigid portion comprises one material segment;
the hard parts are distributed in the flexible parts which are clamped in more than two different material sections; alternatively, the first and second electrodes may be,
the hard parts are distributed on one side of the flexible parts of more than two different material sections.
6. The blood pump rotor according to claim 1, wherein a length ratio of said flexible portion to said hard portion in an axial direction of said cylindrical rotating shaft is 1:3 to 6: 1.
7. The blood pump rotor according to claim 6, wherein the flexible portion and the rigid portion of the blade have a length ratio in the axial direction of the cylindrical rotating shaft of: 3:8, 1:1, 2:1, 100:37, 28:9, 24:7 or 17: 4.
8. The blood pump rotor of claim 1, wherein said blades are 1 to 6 pieces.
9. The blood pump rotor according to claim 8, wherein when the number of the blades is 1, the blades are wound around the periphery of the other end of the cylindrical rotating shaft from the periphery of one end of the cylindrical rotating shaft in a manner of moving to the other end of the cylindrical rotating shaft; the number of the circumference of the blade around the cylindrical rotating shaft is 0.2 to 5.
10. The blood pump rotor according to claim 8, wherein when the number of the blades is 2 to 6, the blades move from the bisector at the periphery of one end of the cylindrical rotating shaft to the other end of the cylindrical rotating shaft, and each blade is wound in parallel around the corresponding bisector at the periphery of the other end of the cylindrical rotating shaft; the number of the circumference of the blade around the cylindrical rotating shaft is 0.1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539721.5A CN111773460A (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539721.5A CN111773460A (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111773460A true CN111773460A (en) | 2020-10-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010539721.5A Pending CN111773460A (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
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| Country | Link |
|---|---|
| CN (1) | CN111773460A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023283250A1 (en) * | 2021-07-07 | 2023-01-12 | Fbr Medical, Inc. | Partially-deformable impeller and catheter blood pump incorporating same |
-
2020
- 2020-06-12 CN CN202010539721.5A patent/CN111773460A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023283250A1 (en) * | 2021-07-07 | 2023-01-12 | Fbr Medical, Inc. | Partially-deformable impeller and catheter blood pump incorporating same |
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