CN212756836U - Blood pump rotor - Google Patents
Blood pump rotor Download PDFInfo
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- CN212756836U CN212756836U CN202021090177.2U CN202021090177U CN212756836U CN 212756836 U CN212756836 U CN 212756836U CN 202021090177 U CN202021090177 U CN 202021090177U CN 212756836 U CN212756836 U CN 212756836U
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Abstract
The utility model 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 utility model relates to the technical field of medical equipment, concretely relates to 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.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a blood pump rotor, which can pump enough blood for a medical object, and hardly destroy various physiological indexes of the blood.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a blood pump rotor, include: 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.
In one embodiment, the length ratio of the flexible portion to the rigid 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 utility model has the advantages that:
the utility model discloses a blood pump rotor structure, the blade part of the blood pump rotor is made of flexible material, the blade is provided with a flexible part and a hard part, the flexible part and the hard part are distributed along the axial direction of the cylindrical rotating shaft and are connected smoothly; the elastic modulus of the material of the flexible portion is smaller than that of the material of the hard portion. The embodiment of the utility model provides a material through the blade to the blood pump rotor carries out corresponding selection material, make the blood pump rotor when rotatory, make the flexible part deformation of blood pump rotor and crooked, because axial cross arrangement or partial cross arrangement along the pivot between flexible portion and the stereoplasm portion, the bending of flexible portion can drive stereoplasm portion deformation thereupon, the blade of blood pump rotor is through setting up flexible portion, in the rotatory in-process of pump, the blade of blood pump rotor has bending deformation when pump sending blood, it is less to destroy this to the physiological index of blood, especially to the red blood cell in the blood, almost can not destroy, in addition, to other physiological index in the blood, also almost not have any influence. Therefore, the blood pump rotor of the embodiment of the utility model has the advantages that the design of the blades can ensure the physiological index of the pumped blood, and the blood pump rotor can be suitable for any medical object, especially the medical object with complications.
Drawings
Fig. 1 is a schematic view of a structure of a blood pump rotor according to an embodiment of the present invention.
Fig. 2 is a schematic view of the structure of the blood pump rotor and blades according to the embodiment of the present invention.
Fig. 3 is a schematic view of the structure of the blood pump rotor and blades according to the embodiment of the present invention.
Fig. 4 is a schematic view of the structure of the blood pump rotor and blades according to the embodiment of the present invention.
Fig. 5 is a schematic view of the structure of the blood pump rotor and blades according to the embodiment of the present invention.
Fig. 6 is a schematic view of the structure of the blood pump rotor and blades according to the embodiment of the present invention.
Fig. 7 is a schematic view of the design of the cylindrical rotating shaft of the blades of the blood pump rotor according to the embodiment of the present invention.
Fig. 8 is a blade angle along-the-way distribution diagram of the blood pump rotor according to the embodiment of the present invention.
Fig. 9 is a design curve diagram of the cylindrical rotating shaft of the blood pump rotor according to the embodiment of the present 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 the utility model discloses a blood pump rotor constitutes structural schematic diagram, as shown in fig. 1, the utility model discloses a blood pump rotor 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, a 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 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 an implementation manner, in the blood pump rotor of the embodiment of the present invention, the flexible portion and the hard portion are in a length ratio of the 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.
The utility model discloses in the blood pump rotor, carry out corresponding selection material through the material to blade 20, make the blood pump rotor when rotatory, make the flexible part deformation of blood pump rotor and crooked, because axial cross arrangement or the partial cross arrangement of following the pivot between flexible portion 201 and the stereoplasm portion 202, the bending of flexible portion 201 can drive stereoplasm portion 202 and warp thereupon, the blade 20 of blood pump rotor is through setting up flexible portion 201, in the rotatory in-process of pump, the blade 20 of blood pump rotor has bending deformation when pump sending blood, this destroys lessly to the physiological index of blood, especially to the red blood cell in the blood, can hardly destroy, in addition, to other physiological index in the blood, also there is hardly any influence.
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. The embodiment of the utility model provides an in, the quantitative relation of flow parameter and hemolytic destruction volume in the section of thick bamboo single flow field that the blood volume estimation obtained according to the experimental measurement through rationally assuming, warping, establishes the hemolysis model that is applicable to complicated flow field. 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.
To sum up, hemolytic size is relevant with the shearing force and exposure time, adopts in blade 20 the utility model discloses when the structural design who provides, when the partial flexible material that is in blade 20's apex, rotor blade 20 can follow the opposite direction of rotation and bend for speed distribution at the apex is improved, thereby reduces apex position shearing force's size, reduces apex position blood hemolytic possibility.
In addition, the utility model discloses blood pump rotor structure's design 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 v isfIndicating the blood velocity, TfIs the stress tensor of the fluid, pfIs the density of blood, bfIs a volume force vTSpeed 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. And the utility model discloses in the blade 20 structure of embodiment, through the mode that flexible portion 201 and stereoplasm portion 202 are crossing or the partial cross arrangement, when making the blade 20 pump sending blood of blood pump rotor, because used flexible material in the blade 20, the blade is crooked at the root when the rotation through the blood pump rotor, change the size of blade and rotation axis angular region, like this, the blade 20 of blood pump rotor can not have blood deposit or adhere to with this narrow position of rotation axis juncture angular region, thereby reduce the formation of thrombus at the blade root with the angular region position of rotation axis juncture.
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 blades 20 of the blood pump rotor are manufactured, the flexible portion 201 and the hard portion 202 with smaller elastic modulus difference can be selected as much as possible based on the elastic modulus 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.
The embodiment of the utility model provides an in, although in the selection of flexible portion 201, the elastic modulus who chooses for use the material is the better less, nevertheless also considers the pumping efficiency of blood pump rotor, consequently, is satisfying not causing under the prerequisite of destruction to the physiological index of pumping object such as blood, also guarantees that pumping efficiency is high as far as possible. 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. If when adopting above-mentioned elastic modulus to be 45.7Mpa to 51.6 Mpa's flexible material, the utility model discloses blood pump rotor's pumping efficiency can reach 90.3% of the pumping efficiency who adopts the pump blade of full stereoplasm, and blood pump rotor's pumping efficiency descends unobviously, and to the pumping object of pumping such as blood, in the sampling of target direction end, hardly see the destruction of red blood cell, stopped hemolytic emergence basically. 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 hard portions 202 are arranged crosswise along the axial direction of the rotating shaft, the length ratio between the adjacent hard 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 hard 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 along 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 along 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 an implementation manner, the flexible portion 201 of the embodiment of the present invention includes one material section, and the hard portion 202 includes more than two different material sections;
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 ratio of the lengths of the flexible portions 201 of the blades 20 in the axial direction of the rotation shaft may be relatively large, and for example, the ratio of the lengths of the rigid portions 202 to the flexible portions 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 rotation 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 ratio of the lengths of the flexible portions 201 of the blades 20 in the axial direction of the rotation shaft may be relatively large, and for example, the ratio of the lengths of the rigid portions 202 to the flexible portions 201 in the axial direction of the rotation shaft is preferably 1: 2 to 1: 3.
As one implementation manner, 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 has no rigid requirement, and may be an alloy material satisfying the above elastic modulus requirement, or a material such as resin, synthetic resin, 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 corresponding requirement for the material of the hard portion 202, as long as it satisfies the elastic modulus of the material of the hard portion 202 is greater than the elastic modulus of 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 material of the flexible portion 201 is selected from resin, the material of the hard portion 202 is preferably also selected from resin with higher hardness and the like. 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 utility model provides an in, when cylindricality pivot 10 was rotatory, the pumping object can be right blade 20 applys reaction thrust, blade 20's flexible portion 201 deformation and make blade 20 is whole crooked along reaction thrust direction, and the pumping object is pumped to the target direction under crooked blade's drive.
In the embodiment of the present invention, as an implementation manner, the blades are 1 to 6 pieces.
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 blade 20 adopts the design mode 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 blade, i.e. needs to set the pump input angle and the pump output angle, etc. The embodiment of the utility model provides a through the design that adopts the flexible portion of part with blade 20, can partly replace the input angle and the output angle of the blade of blood pump rotor, compare with the angle of conventional blood pump rotor blade promptly, the some less that can design a little to based on the deformation of the flexible portion 201 of blade 20, reach the effect identical with the design of the blade of conventional blood pump rotor.
As an implementation manner, 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 equal division of 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 equal division of 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 blood pump rotor according to the embodiment of the present invention, as shown in FIG. 7, determining the diameter D of the impeller housing2Small rangeIn 10mm, the embodiment of the utility model provides a get 6mm, the wheel hub ratio scope roughly can be 0.15 ~ 0.75, the embodiment of the utility model provides a get and be 0.367, obtain blade root diameter D1For 2.2mm, blade length L defines that blade root department blade length and shell diameter ratio range are approximately 1 ~ 2, here take 1.333, so blade length is 8mm, and blade export height b and shell diameter ratio are approximately 0.25 ~ 1.5 for the scope, the embodiment of the utility model provides a take 0.4167, so export length is 2.5 mm.
Fig. 8 is the blade angle along the way distribution diagram of the blood pump rotor of the embodiment of the present invention, as shown in fig. 8, each layer of the outlet angle β of the blade is the same, and the angle is approximately 30 ° -90 ° (the embodiment of the present invention is 60 °) with the circumferential included angle range. Constructing the distribution of the blade angle phi along the way by the inlet installation angles alpha m and beta of each layer, wherein the blade angle is from alpha in the axial directionmGradually 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 curve of the cylindrical shaft of the blood pump rotor according to the embodiment of the present invention, as shown in FIG. 9, the length of the front and rear sections of the blade is l1Range 0 ~ 4mm (the embodiment of the utility model provides a get 0.95mm), apart from centre of rotation distance D1A 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 rotorIn the novel embodiment, D3Take 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+l3+ tau, length are 1.1 ~ 2 times of blade axial length (the utility model discloses the embodiment takes 1.5 times, length 12 mm). The cylindrical rotating shaft 10 design is completed.
According to the blood pump rotor structure provided by the embodiment of the utility model, 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 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. The embodiment of the utility model provides a material through the blade to the blood pump rotor carries out corresponding selection material, makes the blood pump rotor when rotatory, makes the blade of blood pump rotor produce deformation and crooked, and crooked blade forms blood pump rotor blade, with blood pump sending to the target direction. The embodiment of the utility model provides an in, because the periphery that the flexible portion of blade is fixed in the cylindricality pivot can receive the reaction force of pumping object and natural deformation along the rotation direction when the rotor is rotatory to form the pump leaf of pump. In addition, because the utility model discloses blood pump rotor's blade part is made for flexible material, like this, and at the rotatory in-process of pump, blood pump rotor's blade has bending deformation when the pump sending blood, and this destroys lessly to the physiological index of blood, can hardly destroy red blood cell, consequently can guarantee the physiological index of pump sending blood, can be applicable to any medical treatment object, especially has the medical treatment object of complication.
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. The present 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 portion is smaller than the elastic modulus of the material of the hard portion.
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 |
|---|---|---|---|
| CN202021090177.2U CN212756836U (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021090177.2U CN212756836U (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
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| Publication Number | Publication Date |
|---|---|
| CN212756836U true CN212756836U (en) | 2021-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021090177.2U Active CN212756836U (en) | 2020-06-12 | 2020-06-12 | Blood pump rotor |
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| Country | Link |
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| CN (1) | CN212756836U (en) |
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2020
- 2020-06-12 CN CN202021090177.2U patent/CN212756836U/en active Active
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Effective date of registration: 20230309 Address after: Floor 4, Building 3, Building 12, Lide Science and Technology Innovation Park, No. 9, Anlan Road, Chang'an Town, Haining City, Jiaxing City, Zhejiang Province, 314423 Patentee after: Zhejiang Diyuan Medical Equipment Co.,Ltd. Address before: 100037 Beijing City, Xicheng District No. 167 North Patentee before: FUWAI HOSPITAL, CHINESE ACADEMY OF MEDICAL SCIENCES |