CN212940997U - Pump rotor - Google Patents
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- CN212940997U CN212940997U CN202020959149.3U CN202020959149U CN212940997U CN 212940997 U CN212940997 U CN 212940997U CN 202020959149 U CN202020959149 U CN 202020959149U CN 212940997 U CN212940997 U CN 212940997U
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Abstract
The utility model discloses a pump rotor, include: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which 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 part is 8MPa to 80 MPa; the material of the hard part is 35MPa to 195MPa, and 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 flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, the flexible part can be naturally deformed by the reaction force of a pumping object along the rotating direction when the rotor rotates, and the blade of the pump rotor can be bent and deformed when pumping blood in the rotating process of the pump, so that the damage to the physiological indexes of the blood is small.
Description
Technical Field
The embodiment of the application relates to a pump technology in medical treatment, 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, the blood pump in the current blood pump device needs to pump blood, which has a high requirement on the pump, particularly the rotor of the pump, and needs to ensure not only the operating efficiency of the pump rotor, but also the physiological index of the pumping object, i.e. blood, here, the physiological indexes of blood mainly include leukocyte indexes, erythrocyte indexes, hemoglobin indexes, serum-haptoglobin indexes, platelet indexes and other main indexes, and during the high-speed rotation of the blood pump, when the pump pumps blood, physiological indexes in the blood can be influenced, for example, the cell walls of red blood cells in the blood can be damaged during the high-speed rotation process of blades of a pump rotor, the cell walls of a large number of red blood cells in blood are damaged, so that the hemolytic effect of blood can be caused, and a medical subject is subjected to hemolytic complications and is seriously life-threatening.
However, the current blood pump device generally only focuses on the pumping efficiency, but does not focus on the physiological index of the pumped blood, and the main reason is that the blood pump in the current blood pump device is to be placed in the body of the medical object, so the volume of the blood pump is small, the blood pump generally focuses on the working efficiency of the blood pump, and the physiological index of the pumped object of the blood pump focuses less. However, since the blood pump device directly acts on the blood of the medical subject, it is inevitable to damage the blood, 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.
SUMMERY OF THE UTILITY MODEL
In view of the above, an aspect of the embodiments of the present application provides a pump rotor capable of pumping sufficient blood for a medical subject, and hardly damaging various physiological indexes of the blood.
The embodiment of the application provides a pump rotor, includes: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which 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 part is 8MPa to 80 MPa; the elastic modulus of the material of the hard part is 35MPa to 195MPa, and 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, the ratio of the lengths of the flexible portion and the hard portion of the blade in the radial direction of the cylindrical rotating shaft is 1:8 to 5: 1.
In one implementation, the length ratio of the flexible part and the hard part of the blade in the radial direction of the cylindrical rotating shaft is 10:37, 9:26, 11:24, 4:7 or 11: 14.
As one implementation mode, the flexible part of the blade is at least composed of two sections of materials with different elastic moduli;
the elastic modulus of the materials of the different material sections of the flexible part of the blade is gradually reduced from the input side of the pumping object to the target direction.
As one implementation mode, the flexible part of the blade sequentially comprises a first material section and a second material section from the input side of the pumping object to the target direction; the elastic modulus of the material of the first material section is greater than that of the material of the second material section;
the elastic modulus of the material of the first material section is 25Mpa to 80Mpa, and the elastic modulus of the material of the second material section is 8Mpa to 50 Mpa.
As one implementation mode, the flexible part of the blade sequentially comprises a first material section, a second material section and a third material section from the input side of the pumping object to the target direction; the elastic modulus of the material of the first material section is greater than that of the material of the second material section, and the elastic modulus of the material of the second material section is greater than that of the material of the third material section;
the elastic modulus of the material of the first material section is 40Mpa to 80Mpa, the elastic modulus of the material of the second material section is 20Mpa to 60Mpa, and the elastic modulus of the material of the third material section is 8Mpa to 40 Mpa.
As one implementation mode, the flexible part of the blade sequentially comprises a first material section, a second material section, a third material section and a fourth material section from the input side of the pumping object to the target direction; the elastic modulus of the material of the first material section is greater than that of the material of the second material section, the elastic modulus of the material of the second material section is greater than that of the material of the third material section, and the elastic modulus of the material of the third material section is greater than that of the material of the fourth material section;
the elastic modulus of the material of the first material section is 50Mpa to 80Mpa, the elastic modulus of the material of the second material section is 30Mpa to 60Mpa, the elastic modulus of the material of the third material section is 10Mpa to 40Mpa, and the elastic modulus of the material of the fourth material section is 8Mpa to 30 Mpa.
As one implementation, the blades are 1 to 5.
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 5, 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.
According to the pump rotor structure, the blade part of the 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 connected smoothly and integrally; 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. This application embodiment carries out corresponding material selection through the material to the blade of pump rotor, makes pump rotor when rotatory, makes pump rotor's blade produce deformation and crooked, and crooked blade forms pump rotor blade, with blood pump delivery to target direction. In the embodiment of the application, the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, and the flexible part of the blade is naturally deformed by the reaction force of a 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 pump rotor of the embodiment of the application is made of the flexible material, in the rotation process of the pump, the blade of the pump rotor can be bent and deformed when pumping blood, the damage to the physiological index of the blood is small, and red blood cells are hardly damaged, so that the physiological index of the pumped blood can be ensured, and the pump rotor can be suitable for any medical objects, particularly the medical objects with complications.
Drawings
FIG. 1 is a schematic view of a pump rotor assembly according to an embodiment of the present application;
FIG. 2 is a schematic view of a vane of a pump rotor according to an embodiment of the present application;
FIG. 3 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;
FIG. 4 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;
FIG. 5 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;
FIG. 6 is a schematic view of the construction of a vane of a pump rotor according to an embodiment of the present application;
FIG. 7 is a schematic view of a design of a cylindrical rotating shaft of a vane of a pump rotor according to an embodiment of the present application;
FIG. 8 is a vane angle profile of a pump rotor according to an embodiment of the present application;
fig. 9 is a design graph of a cylindrical rotating shaft of a pump rotor according to an embodiment of the present application.
Detailed Description
The essence of the technical solution of the embodiments of the present application is explained in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a pump rotor according to an embodiment of the present application, and as shown in fig. 1, the pump rotor according to the embodiment of the present application includes: a cylindrical rotating shaft 10 and a vane 20.
Fig. 2 is a schematic structural view illustrating a vane of a pump rotor according to an embodiment of the present application, and fig. 3 is a schematic structural view illustrating a vane of a pump rotor according to an embodiment of the present application; as shown in fig. 2 and 3, the blade 20 has a flexible portion 201 and a hard portion 202, and the flexible portion 201 and the hard portion 202 are integrally and smoothly connected; the flexible portion 201 of the vane 20 is fixed on the periphery of the cylindrical rotating shaft 10 so that the vane 20 is distributed on the periphery of the cylindrical rotating shaft 10.
In the embodiment of the present application, the connection portion between the vane 20 and the cylindrical rotating shaft 10 is configured to be flexible, so that when the pump rotor rotates to drive the vane 20 to rotate, after the vane 20 contacts with a pumping object such as blood, the flexible portion 201 is deformed under an acting force applied by the pumping object, thereby forming a pumping structure for pumping blood, and pumping blood and the like to a target direction. Moreover, because the blade 20 is made of flexible material, the pump rotor has a certain protection effect on the pumping object in the rotating process, namely, the blade 20 of the pump rotor can not hurt the physiological indexes of the pumping object such as blood, and all the physiological indexes of the pumped blood can not be damaged.
When pumping blood to a medical subject, it is important to prevent hemolysis of the pumped blood, since hemolysis of the blood during pumping would endanger the life safety of the medical subject. 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 concentration of plasma free hemoglobin increases after hemolysis, and the excess free hemoglobin needs to be excreted through the kidney, thereby possibly causing renal impairment and multiple organ failure.
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 concentration of plasma free hemoglobin increases after hemolysis, and the excess free hemoglobin needs to be excreted through the kidney, thereby possibly causing renal impairment and multiple organ failure. In the embodiment of the application, 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 through 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, β are constants obtained by regression analysis of experimental data.
In summary, the amount of hemolysis is related to the shear force and the exposure time, when the blade 20 is designed by the structure proposed in the embodiment of the present application, and the root portion of the blade 20 is made of flexible material, the rotor blade 20 will bend in the opposite direction of the rotation direction, so that the speed distribution at the blade tip is improved, thereby reducing the amount of shear force at the blade tip position and reducing the possibility of hemolysis of blood at the blade tip position.
In addition, the pump rotor structure of the embodiment of the application can be designed to 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, the incompressible flow equation being as follows:
wherein v isfIndicating the blood velocity, TfIs the stress tensor of the fluid, pfIs the density of blood, bfIs the volume force, vTThe velocity of the thrombus, C21e9 is the resistance coefficient and phi is the volume fraction of platelets deposited.
In the above mathematical model of thrombus (platelet), the chemical and biological material reaction process of platelet deposition is 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 narrow space is a major cause of thrombus formation. In the blade 20 structure of the embodiment of the present application, by setting the flexible portion at the root of the blade, when the blade 20 of the pump rotor pumps blood, the blade 20 of the pump rotor does not have blood deposition or adhesion in the narrow region of the corner region where the blade of the pump rotor and the rotating shaft are connected due to the deformation of the root, and after the root of the blade 20 is made of a flexible material, the blade can be bent at the root by the rotation of the pump rotor, so that the size of the corner region between the blade and the rotating shaft is changed, the possibility of blood adhesion in the corner region is reduced, and the generation of thrombus at the corner region where the blade root and the rotating shaft are connected is reduced.
In the embodiment of the present application, 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 application, in the material selection of the flexible portion 201, the smaller the elastic modulus of the selected material is, the better it is, but the pumping efficiency of the pump rotor is also considered, so that the pumping efficiency is ensured to be as high as possible on the premise that the physiological index of the pumping object, such as blood, is not damaged. 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 object such as blood is small, and the pumping efficiency of the 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 pump rotor in the embodiment of the present application can reach 90.3% of the pumping efficiency of the fully rigid pump blade, the pumping efficiency of the pump rotor is not obviously reduced, and for a pumped object such as blood, the damage of red blood cells is hardly seen in the sampling at the end of the target direction, and 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, as one mode of realization, the elastic modulus of the material of the flexible portion 201 in the embodiment of the present application is more preferably between 47.93Mpa and 48.67 Mpa.
In the embodiment of the present application, the material of the flexible portion 201 is not limited to the hard material, and may be an alloy material satisfying the above elastic modulus requirement, or a material such as a resin, a synthetic resin, a mixed resin, or the like satisfying the above elastic modulus requirement. In the embodiment of the present invention, the flexible material of the flexible portion is preferably a resin material.
In the embodiment of the present application, 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 application, 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 this embodiment, when the cylindrical rotating shaft 10 rotates, the pumping object can apply a reaction thrust to the blade 20, the flexible portion 201 of the blade 20 deforms to make the blade 20 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 shown in fig. 2 and 3, in the embodiment of the present application, the length ratio of the flexible portion 201 and the hard portion 202 of the blade 20 in the radial direction of the cylindrical rotating shaft 10 is 1:8 to 5: 1. I.e. the ratio between the height of the flexible part 201 at the lower end and the rigid part 202 at the upper end in fig. 2 is between 1:8 and 5: 1. As a preferable mode, the ratio of the height of the flexible portion 201 at the lower end to the rigid portion 202 at the upper end in fig. 2 is between 1:5 and 2: 1. In one implementation, the length ratio of the flexible part and the hard part of the blade in the radial direction of the cylindrical rotating shaft is 10:37, 9:26, 11:24, 4:7 or 11: 14.
Fig. 4 is a schematic structural diagram illustrating a blade of a pump rotor according to an embodiment of the present invention, and as shown in fig. 4, in the embodiment of the present invention, the flexible portion 201 of the blade 20 is made of at least two sections of materials with different elastic moduli; the elastic modulus of the material of the different material sections of the flexible portion 201 of the vane 20 decreases from the input side to the target direction of the pumping target.
As shown in fig. 4, in the embodiment of the present application, the flexible portion 201 of the vane 20 sequentially includes a first material segment 2010 and a second material segment 2011 from the input side to the target direction of the pumping object; the elastic modulus of the material of the first material segment 2010 is greater than the elastic modulus of the material of the second material segment 2011;
the elastic modulus of the material of the first material section 2010 is 25Mpa to 80Mpa, and the elastic modulus of the material of the second material section 2011 is 8Mpa to 50 Mpa. In one implementation manner, in the embodiment of the present application, the elastic modulus of the material of the first material section 2010 is preferably 43Mpa to 58Mpa, and the elastic modulus of the material of the second material section 2011 is preferably 35Mpa to 54 Mpa.
Fig. 5 is a schematic structural diagram of a blade of a pump rotor according to an embodiment of the present disclosure, and as shown in fig. 5, a flexible portion 201 of a blade 20 according to an embodiment of the present disclosure includes, in order from an input side of a pumping target to a target direction, a first material segment 2010, a second material segment 2011, and a third material segment 2012; the elastic modulus of the material of the first material section 2010 is greater than the elastic modulus of the material of the second material section 2011, and the elastic modulus of the material of the second material section 2011 is greater than the elastic modulus of the material of the third material section 2012.
The elastic modulus of the material of first material section 2010 is 40Mpa to 80Mpa, the elastic modulus of the material of second material section 2011 is 20Mpa to 60Mpa, the elastic modulus of the material of third material section 2012 is 8Mpa to 40 Mpa.
Fig. 6 is a schematic structural diagram of a blade of a pump rotor according to an embodiment of the present application, and as shown in fig. 6, the flexible portion 20 of the blade 20 sequentially includes a first material section 2010, a second material section 2011, a third material section 2012, and a fourth material section 2013 from an input side of a pumping object to a target direction; the elastic modulus of the material of the first material section 2010 is greater than the elastic modulus of the material of the second material section 2011, the elastic modulus of the material of the second material section 2011 is greater than the elastic modulus of the material of the third material section 2012, and the elastic modulus of the material of the third material section 2012 is greater than the elastic modulus of the material of the fourth material section 2013;
the elastic modulus of the material of first material section 2010 is 50Mpa to 80Mpa, the elastic modulus of the material of second material section 2011 is 30Mpa to 60Mpa, the elastic modulus of the material of third material section 2012 is 10Mpa to 40Mpa, the elastic modulus of the material of fourth material section 2013 is 8Mpa to 30 Mpa.
In the embodiment of the present application, the flexible portion 20 of the vane 20 is made of flexible materials with different elastic moduli, so that the vane 20 can deform around the circumference of the cylindrical rotating shaft 10, thereby forming a bending deformation of the pump vane, and improving the pumping efficiency of the pump rotor of the embodiment of the present application.
In the embodiment of the present application, as an implementation manner, the number of the blades is 1 to 5.
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.
In the embodiment of the present invention, although the blades 20 adopt the design of the flexible portion 201, the design of the blades in the pump rotor structure of the embodiment of the present invention still needs to adopt the design principle of the common pump rotor blades, that is, the pump input angle and the pump output angle need to be set. The embodiment of the present application can partially replace the input angle and the output angle of the vane of the pump rotor by adopting the design of the partially flexible portion for the vane 20, that is, the angle of the vane can be slightly smaller than that of the conventional pump rotor vane, so that the same effect as that of the vane of the conventional pump rotor can be achieved based on the deformation of the flexible portion 201 of the vane 20.
As one way of realization, in the embodiment of the present application, as shown in fig. 1, when the vanes 20 of the pump rotor are 2 to 5, the vanes 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 vane 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 a cylindrical shaft design of a vane of a pump rotor according to an embodiment of the present application, as shown in FIG. 7, for determining the diameter D of an impeller casing2The range is less than 10mm, 6mm is taken as the embodiment of the application, the hub ratio range can be approximately 0.15-0.75, 0.367 is taken as the embodiment of the application, 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 is taken, so the blade length is 8mm, the ratio of the blade outlet height b to the housing diameter is approximately 0.25-1.5, 0.4167 is taken in the embodiment of the application, so the outlet length is 2.5 mm.
Fig. 8 is a distribution diagram of the vane angle of the pump rotor according to the embodiment of the present invention along the way, and as shown in fig. 8, the outlet angle β of the vane is the same for each layer, and is set to be approximately in the range of 30 ° to 90 ° (60 ° in the embodiment of the present invention) with respect to the circumferential direction. At inlet mounting angle alpha of each layermBeta, the blade angle phi is constructed to be distributed along the way, and the blade angle is axially from alphamGradually changing to beta to obtain the central line of the blade of each layer, wherein the wrap angles of the blade obtained by the method around the shaft of each layer can be different but are not less than 90 degrees, the absolute value of the difference value 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 pump rotor according to the embodiment of the present invention, as shown in FIG. 9, the length of the front and rear portions of the vane is l1 (0.95 mm in the embodiment of the present invention), and the distance D from the center of rotation is in the range of 0-4 mm1And a line L1 with the constant/2, wherein when L1 is 0, the starting point and the ending point of the curves are overlapped and positioned at the front 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 direction1The/2 is reduced to 0, the axial length l 2. Curve L3 begins at the downstream termination point of L1 and tapers axially downstream toward the center of rotationLarge, maximum distance D reached at the root of the blade3/2，D3Not exceeding the diameter of the blade rotor (in the embodiment of the present application, D)3Take 5.6 mm). The oblique angle theta of the rotating shaft (included angle with the axial direction) at the downstream end point of L1 is 0 deg., and at the maximum distance, the oblique angle theta of the rotating shaft is in the range of 20-90 deg. (50 deg.), and the two angles are the tangent angle of the beginning and the end of the L3 curve and the axial length L3. After the three curves are connected, the rotation axis entity is obtained by rotating for one circle, 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, the axial length of the rotation axis is l1+ l2+ l3+ tau, and the length is 1.1-2 times of the axial length of the blade (the axial length of the embodiment of the application is 1.5 times and the axial length of the blade is 12 mm). The design of the cylindrical rotating shaft 10 is completed.
According to the pump rotor structure, the blade part of the 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 connected smoothly and integrally; 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. This application embodiment carries out corresponding material selection through the material to the blade of pump rotor, makes pump rotor when rotatory, makes pump rotor's blade produce deformation and crooked, and crooked blade forms pump rotor blade, with blood pump delivery to target direction. In the embodiment of the application, the flexible part of the blade is fixed on the periphery of the cylindrical rotating shaft, and the flexible part of the blade is naturally deformed by the reaction force of a 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 pump rotor of the embodiment of the application is made of the flexible material, in the rotation process of the pump, the blade of the pump rotor can be bent and deformed when pumping blood, the damage to the physiological index of the blood is small, and red blood cells are hardly damaged, so that the physiological index of the pumped blood can be ensured, and the pump rotor can be suitable for any medical objects, particularly the medical objects with complications.
In addition, because the flexible part is arranged on the blades of the pump rotor in the radial direction of the rotating shaft, when the pump rotor of the embodiment of the application is conveyed into the body of a medical object, such as a ventricle, the blades of the pump rotor can be bound to reduce the whole diameter of the pump rotor, so that the pump rotor is easier to place in an arterial vessel or other organs of the medical object, and the medical treatment of the medical object is facilitated.
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 disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application 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 pump rotor, characterized in that the pump rotor comprises: a cylindrical rotating shaft and a blade; the blade is provided with a flexible part and a hard part which 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.
2. The pump rotor according to claim 1, wherein the flexible portion and the hard portion of the vane have a length ratio of 1:8 to 5:1 in a radial direction of the cylindrical rotating shaft.
3. A pump rotor according to claim 2, wherein the flexible portion and the hard portion of the vane have a length ratio of 10:37, 9:26, 11:24, 4:7, or 11:14 in a radial direction of the cylindrical rotating shaft.
4. A pump rotor according to any one of claims 1 to 3, wherein the flexible portion of the vane is formed of at least two sections of materials having different elastic moduli;
the elastic modulus of the materials of the different material sections of the flexible part of the blade is gradually reduced from the input side of the pumping object to the target direction.
5. The pump rotor according to claim 4, wherein the flexible portion of the vane includes a first material section and a second material section in this order from the input side to the target direction of the pumping target; the elastic modulus of the material of the first material section is greater than that of the material of the second material section.
6. The pump rotor as claimed in claim 4, wherein the flexible portion of the vane is composed of a first material section, a second material section and a third material section in this order from the input side to the target direction of the pumping target; the elastic modulus of the material of the first material section is greater than that of the material of the second material section, and the elastic modulus of the material of the second material section is greater than that of the material of the third material section.
7. The pump rotor according to claim 4, wherein the flexible portion of the vane includes a first material section, a second material section, a third material section, and a fourth material section in this order from the input side to the target direction of the pumping target; the elastic modulus of the material of the first material section is greater than the elastic modulus of the material of the second material section, the elastic modulus of the material of the second material section is greater than the elastic modulus of the material of the third material section, and the elastic modulus of the material of the third material section is greater than the elastic modulus of the material of the fourth material section.
8. A pump rotor according to claim 1, wherein the vanes are 1 to 5 pieces.
9. The pump rotor according to claim 8, wherein when the number of the vanes is 1, the vanes are wound around the periphery of the other end of the cylindrical rotating shaft from the periphery of the one end of the cylindrical rotating shaft in such a manner as to move toward 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 pump rotor according to claim 8, wherein when the number of the vanes is 2 to 5, the vanes are moved from a bisector at the periphery of one end of the cylindrical rotating shaft toward the other end of the cylindrical rotating shaft, and each vane is wound in parallel around a 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 |
|---|---|---|---|
| CN202020959149.3U CN212940997U (en) | 2020-05-27 | 2020-05-27 | Pump rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020959149.3U CN212940997U (en) | 2020-05-27 | 2020-05-27 | Pump rotor |
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| CN212940997U true CN212940997U (en) | 2021-04-13 |
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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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2020
- 2020-05-27 CN CN202020959149.3U patent/CN212940997U/en active Active
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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