CN114432588B - Aortic puncture type axial flow blood pump with edge folding blade structure - Google Patents
Aortic puncture type axial flow blood pump with edge folding blade structure Download PDFInfo
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- CN114432588B CN114432588B CN202210056154.7A CN202210056154A CN114432588B CN 114432588 B CN114432588 B CN 114432588B CN 202210056154 A CN202210056154 A CN 202210056154A CN 114432588 B CN114432588 B CN 114432588B
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- 210000004369 blood Anatomy 0.000 title claims abstract description 77
- 239000008280 blood Substances 0.000 title claims abstract description 77
- 238000009957 hemming Methods 0.000 claims abstract description 12
- 230000006378 damage Effects 0.000 claims abstract description 8
- 238000005452 bending Methods 0.000 claims description 58
- 210000002376 aorta thoracic Anatomy 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 206010018910 Haemolysis Diseases 0.000 abstract description 7
- 230000008588 hemolysis Effects 0.000 abstract description 7
- 230000002949 hemolytic effect Effects 0.000 abstract description 5
- 208000007536 Thrombosis Diseases 0.000 abstract description 4
- 210000000601 blood cell Anatomy 0.000 description 7
- 230000017531 blood circulation Effects 0.000 description 7
- 206010019280 Heart failures Diseases 0.000 description 6
- 210000005244 lower chamber Anatomy 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000002513 implantation Methods 0.000 description 4
- 210000005240 left ventricle Anatomy 0.000 description 4
- 210000001367 artery Anatomy 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000002054 transplantation Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000005779 cell damage Effects 0.000 description 2
- 208000037887 cell injury Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004962 physiological condition Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
- A61M60/806—Vanes or blades
- A61M60/808—Vanes or blades specially adapted for deformable impellers, e.g. expandable impellers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
- A61M60/812—Vanes or blades, e.g. static flow guides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
- A61M60/865—Devices for guiding or inserting pumps or pumping devices into the patient's body
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
- Biomedical Technology (AREA)
- Anesthesiology (AREA)
- Mechanical Engineering (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
Abstract
The invention provides an aortic puncture type axial flow blood pump with a hemming blade structure, which comprises a pump shell, guide vanes, impellers, a driving device and a rotating shaft, wherein the guide vanes are arranged on the pump shell; one end of the upper cavity is an inlet, the other end of the upper cavity is an outlet, a driving device is arranged in the lower cavity, an output shaft of the driving device is connected with a rotating shaft, the rotating shaft penetrates into the upper cavity, impellers are arranged on the rotating shaft in the upper cavity, guide vanes arranged on a pump shell are respectively arranged on two sides of the impellers, and the rotating shaft penetrates through the guide vanes; the impeller comprises impeller blades which are spirally distributed on the rotating shaft; the rotating shaft is provided with a spiral groove, and the impeller blades are movably arranged in the spiral groove; the inner wall of the pump shell where the impeller is arranged is provided with a groove, and the edge of the impeller blade is attached to the groove by the centrifugal force generated by the rotation of the impeller blade. The invention greatly reduces the damage to blood, improves the hemolytic performance of the blood pump, and reduces the incidence rate of hemolysis and thrombus.
Description
Technical Field
The invention relates to the technical field of medical appliances, in particular to an aortic puncture type axial flow blood pump with a hemming blade structure.
Background
The most effective method for treating heart failure is heart transplantation, but the lack of a donor is always a common problem facing the transplantation community, and a large number of heart failure patients die in waiting for transplantation every year. The advent of artificial heart pumps (abbreviated as blood pumps) has provided a new approach to the treatment of heart failure and has become an effective means of current heart failure treatment.
The two most critical performance indicators in blood pump design are: hydraulic performance and haemolytic performance. The hydraulic performance refers to whether the blood pump can meet the human blood circulation requirement of 5L/min flow and 13.3Kpa pressure under the designed volume and working condition. The hemolysis performance refers to the condition in which blood is subjected to the influence of a blood pump to cause damage to blood cells and hemolysis after flowing through the blood pump.
At present, two key technical problems exist in the structural design of the blood pump:
1. in order to facilitate minimally invasive implantation, the volume of the blood pump needs to be reduced, but the reduction of the volume cannot meet the working condition requirement of human blood circulation;
2. in order to achieve adequate pumping performance, it is necessary to increase the rotational speed of the blood pump, but this can lead to hemolysis of the blood cells due to excessive flow field shear stress, thereby compromising the normal physiological condition of the implanter.
Aiming at the first difficult problem: the axial flow type blood pump is used as an effective device for treating heart failure, and has the advantages of small volume, simple structure, light weight, large flow, high efficiency, easy implantation and the like, and gradually becomes the main development direction of the impeller blood pump. The axial flow blood pump drives blood to move along the axial direction through the rotation of the impeller, thereby meeting the requirement of human blood circulation. The impeller is damaged by blood cells caused by leakage of the clearance between the blade tips, and the blade tip structure is easy to scratch the blood cells, so that hemolysis is generated, and the structural design of the axial flow blood pump is crucial to the performance of the axial flow blood pump.
Based on selecting an axial flow blood pump, aiming at the second problem, the prior art discloses a miniature axial flow blood pump with a non-equal length split-flow blade structure, wherein at least one long split-flow blade and one short split-flow blade are arranged between every two long blades. The prior art discloses a novel inner impeller axial flow type blood pump, wherein the centers of a front guide vane, a rear guide vane and an impeller form a blood first flow channel which is a main flow channel, and a gap between the impeller and a shell forms a blood second flow channel which is a pump internal leakage flow channel. The clearance between the impeller and the shell is narrow, so that flow stagnation is easy to occur, and thrombus is caused. To assist this portion of the blood flow, thrombosis is reduced by adding a suitable spiral on the outer circumference of the inner impeller to direct the flow of blood. The prior art discloses guide vane fixed at the pump line inner wall, and preceding cover awl is supported by single cantilever, and back cover awl is on the return bend in the back, and the pump inner tube is formed by a front section of thick bamboo and return bend butt joint, and the last sewing ring that is overlapping of shell section of thick bamboo back end, and the blood pump anterior segment can be by the heart apex incision direct insertion heart failure patient's ventricle in, realizes parallelly connected ventricle auxiliary. The prior art discloses an implanted hollow miniature axial blood pump, which comprises a sleeve, a pump body arranged in the sleeve and a driving device arranged outside the sleeve, wherein the driving device comprises an electromagnetic driving coil and a controller, the pump body comprises a front guide vane, a rotor and a rear guide vane, the rotor consists of a rotor cylinder and rotor blades, the rotor blades grow on the inner surface of the rotor cylinder, and a hollow blood flow channel is arranged in the middle of the rotor, so that the rotor forms an integrated hollow inner spiral vane type structure.
Aiming at the axial flow blood pump researched by the prior scholars, the problems of blood cell damage caused by high shearing stress of a plurality of flow dividing blades, screw line function failure caused by long-time operation of the blood pump, blood retention, large operation wound, complex blood contact surface caused by a hollow structure, hemolysis and the like exist.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides an aortic puncture type axial flow blood pump with a flanging blade structure, wherein an outlet in the pump shell is designed to be of an arc-shaped curved surface structure matched with an aortic arch, blood is smoothly pumped into a main artery from a left ventricle by adopting an aortic puncture implantation mode, and meanwhile, an impeller blade is designed to be a flanging blade by the blood pump, so that the impeller is tightly matched with the pump shell, the blood damage is greatly reduced, the hemolytic performance of the blood pump is improved, and the occurrence rate of hemolysis and thrombus is reduced.
The present invention achieves the above technical object by the following means.
An aortic puncture type axial flow blood pump with a hemmed blade structure comprises a pump shell, guide vanes, impellers, a driving device and a rotating shaft;
an upper chamber and a lower chamber which are not communicated with each other are arranged in the pump shell, one end of the upper chamber is an inlet, the other end of the upper chamber is an outlet, a driving device is arranged in the lower chamber, an output shaft of the driving device is connected with a rotating shaft, the rotating shaft penetrates into the upper chamber, an impeller is arranged on the rotating shaft in the upper chamber, guide vanes arranged on the pump shell are respectively arranged on two sides of the impeller, and the rotating shaft penetrates through the guide vanes;
the impeller comprises impeller blades which are spirally distributed on the rotating shaft; the rotating shaft is provided with a spiral groove, and the impeller blades are movably arranged in the spiral groove; the inner wall of the pump shell where the impeller is arranged is provided with a groove, and the edge of the impeller blade is attached to the groove by the centrifugal force generated by the rotation of the impeller blade.
Further, the impeller blades are folded edges, and the wrap angles of the impeller blades are smaller than 180 degrees.
Further, the hem blade includes first body and the second body of bending, first body one end of bending is located the helicla flute, be equipped with the dog-ear between the body other end of first bending and the body one end of second bending, the body other end of second bending is equipped with the chamfer, through the rotatory centrifugal force that produces of hem blade, makes close fit between the adjacent impeller blade in the helicla flute, and make the second body other end of bending of hem blade and the dog-ear close fit of adjacent hem blade.
Further, when the impeller does not rotate, the second bending body forms an acute angle beta with the axis of the rotating shaft, and the second bending body inclines towards the rotating shaft; when the impeller does not rotate, gaps are reserved between adjacent impeller blades in the spiral groove, and gaps are reserved between the other ends of the second bending bodies of the edge folding blades and the bending angles of the adjacent edge folding blades.
Further, the first bent body inner side and the second bent body inner side are in smooth transition for reducing blood injury.
Further, the outlet at the other end of the upper cavity is an arc-shaped curved surface, and the arc-shaped curved surface is in smooth transition with the aortic arch.
Further, the inner wall of the pump shell is provided with a diversion trench, and two ends of the diversion trench are communicated with the upper chambers at two sides of the impeller.
Further, one end of the impeller blade is rotated in the spiral groove and then moved to the outside by centrifugal force generated by rotation of the impeller blade.
Further, the cross section of the spiral groove comprises a first edge ao, a second edge ob, a third edge co ', a fourth edge o'd and a bottom edge bd, wherein the first edge ao and the second edge ob are intersected at an o point, and the third edge co ' and the fourth edge o'd are intersected at an o ' point; when the impeller blades do not rotate, the suction surfaces SS of the impeller blades are in contact with o points, the y pressure surfaces PS of the impeller blades are in contact with the third edge co', and the end surfaces of the impeller blades are in contact with the bottom edge bd; the suction surface SS of the impeller blade is brought into contact with the first edge ao, the pressure surface PS of the impeller blade is brought into contact with the fourth edge o'd, and the end surface of the impeller blade is separated from the bottom edge bd by centrifugal force generated by rotation of the impeller blade.
Further, when the impeller blades rotate, the distance h from the end surfaces of the impeller blades to the bottom edge bd is 1/9-1/7 of the diameter of the rotating shaft.
Further, medical lubricating wear-resistant materials are plated on the surfaces of the pump shell groove and the impeller.
The invention has the beneficial effects that:
1. according to the aortic puncture type axial flow blood pump with the flanging blade structure, the inside of the pump shell is designed into an arc-shaped curved surface structure which is matched with an aortic arch, the physiological form of the aortic arch is simulated, and the aortic puncture type implantation mode is adopted, so that blood can be completely and smoothly pumped into a main artery from a left ventricle.
2. Compared with the traditional impeller design, the aortic puncture type axial flow blood pump with the flanging vane structure has the advantages that the impeller and the pump shell groove are attached through centrifugal force, and therefore friction-free movement between the impeller and the pump shell groove during working is achieved. Meanwhile, blood is prevented from entering a gap between the impeller and the pump shell, and the occurrence of the condition that blood is left at the rim of a common impeller can be reduced, so that the probability of coagulation is reduced.
3. According to the aortic puncture type axial flow blood pump with the flanging blade structure, the flanging blade structure is adopted by the impeller blades, so that the end surfaces between the adjacent impeller blades are perfectly matched with each other without gaps, and the impeller forms a seamless cavity, so that blood completely flows in the impeller cavity, the blood damage is reduced, and the hemolytic performance of the blood pump is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an aortic puncture type axial flow blood pump with a hemming blade structure according to the present invention.
Fig. 2 is a schematic view of the impeller structure according to the present invention.
Fig. 3 is a view showing the impeller blades when they are not in operation.
Fig. 4 is a view of the impeller blades in operation.
FIG. 5 is a schematic view of a seamless interface between adjacent impeller blades during operation.
Fig. 6 is a schematic diagram of the operation of a prior art impeller.
Fig. 7 is a graph showing the angular change of the impeller blade according to the present invention when it is operated and not operated.
Fig. 8 is a schematic view of the working principle of the impeller blade according to the present invention.
Fig. 9 is an enlarged view of part ii of fig. 8.
Fig. 10 is an enlarged view of a portion of iii of fig. 8.
FIG. 11 is a schematic view of a flow guide groove.
Fig. 12 is a radial distribution of channels within the pump casing.
In the figure:
1-a pump shell; 2-front guide vanes; 3-an impeller; 4-pump housing end caps; 5-a motor; 6-rotating shaft; 7-aft guide vanes; 301-impeller blades; 301 a-first impeller blades; 301 b-second impeller blades; 302-helical grooves; 301-1-a first bending body; 301-2-second bent body; 101-diversion trench.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1, the aortic puncture type axial flow blood pump with the hemmed blade structure comprises a pump shell 1, a front guide vane 2, an impeller 3, a pump shell end cover 4, a motor 5, a rotating shaft 6 and a rear guide vane 7; an upper chamber and a lower chamber which are not communicated with each other are arranged in the pump shell 1, one end of the upper chamber is an inlet, the side surface of the other end of the upper chamber is an outlet, the outlet of the other end of the upper chamber is an arc-shaped curved surface, and the arc-shaped curved surface is in smooth transition with an aortic arch. The lower chamber is closed by a pump housing end cap 4; a motor 5 is arranged in the lower chamber, an output shaft of the motor 5 is connected with a rotating shaft 6, the rotating shaft 6 penetrates into the upper chamber, an impeller 3 is arranged on the rotating shaft 6 in the upper chamber, a front guide vane 2 and a rear guide vane 7 which are arranged on the pump shell 1 are respectively arranged on two sides of the impeller 3, and the rotating shaft 6 penetrates through the front guide vane 2 and the rear guide vane 7; the front guide vane 2 is positioned at the upstream of the impeller 3 in the pump shell 1 to play a role in guiding flow, a guide bearing is arranged in the front guide vane 2, and the sleeve structure of the front guide vane 2 is in interference fit with the pump shell 1 so as to be fixed; the rear guide vane 7 is positioned at the downstream of the impeller 3 in the pump shell 1 and plays a role in rectification, and the rear guide vane 7 is fixed on the inner wall of the pump shell 1; as shown in fig. 2, the impeller 3 includes impeller blades 301, and the impeller blades 301 are spirally distributed on the rotating shaft 6; a spiral groove 302 is formed in the rotating shaft 6, and the impeller blades 301 are movably arranged in the spiral groove 302; grooves are formed in the inner wall of the pump shell 1 where the impeller 3 is installed, and the edges of the impeller blades 301 are attached to the grooves by centrifugal force generated by rotation of the impeller blades 301. The main forces are centrifugal forces, but other forces such as dead weight of the blade, reaction force of the fluid, concentrated stress generated at the joint of the root of the blade and the hub are also included, which will not be described in detail. The surface of the impeller blade 301 contacted with the groove is a mirror surface, and the surface of the groove is also a mirror surface, so that the impeller blade 301 can realize low-friction contact in the rotating process, and the heat generated by friction can be greatly reduced by utilizing the action of a water film in blood for lubrication. The impeller 3 is attached to the groove of the pump shell 1 through centrifugal force, so that friction-free or low-friction movement between the impeller 3 and the groove of the pump shell 1 during working is realized, blood can be prevented from entering a gap between the impeller 3 and the pump shell 1, and the occurrence of the condition that blood is left at the rim of a common impeller can be reduced, so that the probability of coagulation is reduced.
As shown in fig. 2 and 3, the impeller blade 301 is a hemmed blade, and the wrap angle of the impeller blade 301 is less than 180 °. The edge folding blade comprises a first bending body 301-1 and a second bending body 301-2, one end of the first bending body 301-1 is located in a spiral groove 302, a bending angle is arranged between the other end of the first bending body 301-1 and one end of the second bending body 301-2, a chamfer is arranged at the other end of the second bending body 301-2, adjacent impeller blades in one spiral groove 302 are tightly matched through centrifugal force generated by rotation of the edge folding blade, and the other end of the second bending body 301-2 of the edge folding blade is tightly matched with the bending angle of the adjacent edge folding blade, as shown in fig. 4 and 5. Taking fig. 5 as an example, the first impeller blade 301a and the second impeller blade 301b are adjacent impeller blades, and a chamfer at the other end of the second bending body 301-2 of the first impeller blade 301a is tightly matched with a bending angle of the second impeller blade 301 b.
As shown in fig. 7, when the impeller 3 is not rotating, the second bending body 301-2 forms an acute angle β with the axis of the rotating shaft 6, and the second bending body 301-2 is inclined toward the rotating shaft 6; when the impeller 3 does not rotate, a gap is arranged between the other end of the second bending body 301-2 of the edge folding blade and the bending angle of the adjacent edge folding blade. The inner side of the first bending body 301-1 and the inner side of the second bending body 301-2 are in smooth transition for reducing blood damage. When the impeller 3 rotates, the second bending body 301-2 is parallel to the axis of the rotating shaft 6, and the other end of the second bending body 301-2 of the flanging blade is tightly matched with the bending angle of the adjacent flanging blade.
In the examples: the first bending body 301-1 of the impeller blade 301 is inserted into the spiral groove 302 to a depth of 3-6 mm; the length of the second bending body 301-2 is 3-6 mm, the thickness of the first bending body 301-1 and the second bending body 301-2 is 0.5-1.2 mm, and the acute angle beta between the second bending body 301-2 and the axis of the rotating shaft 6 is 2 0 ～14 0 Between them.
As shown in fig. 6, the axial sectional view of the impeller blade of the conventional axial flow blood pump shows that in general axial flow blood enters the gap between the impeller outer edge and the pump casing from the impeller inlet, and meanwhile, when the blood flows inside the impeller, the blood easily flows from the suction surface of the impeller blade to the impeller outer edge to flow into the gap, and both cases can cause the blood to be destroyed and hemolyzed, so that the situation that blood is left at the impeller rim due to coagulation is formed, and the normal operation of the blood pump is affected. As shown in fig. 7 and 8, when the aortic puncture type axial flow blood pump with the hemming blade structure is not in operation, an included angle alpha is formed between the first bending body 301-1 and a vertical line of the central line of the rotating shaft 6, and an included angle beta is formed between the second bending body 301-2 and a horizontal line, so that the impeller is convenient to install; however, when the blood pump starts to work, due to the high-speed rotation of the impeller 3, the impeller blades 301 are expanded outwards by the centrifugal force generated by the impeller and the combined force such as the acting force in all aspects, so that the first bending body 301-1 is inserted into the spiral groove 302 and moves upwards and leftwards from the original position, at the moment, the adjacent impeller blades are tightly connected, the other ends of the second bending bodies 301-2 of the bending blades are tightly matched with the bending corners of the adjacent bending blades, the included angle between the impeller blades 301 and the horizontal direction is reduced to zero, the grooves of the pump shell 1 and the surface of the impeller 3 are plated with medical lubricating wear-resistant materials POM, and meanwhile, the water film in blood is used for lubrication, so that no friction or low friction movement between the impeller and the impeller is realized during working. Due to the precise assembly of the impeller 3 and the groove of the pump shell 1 and the seamless sealing cavity formed by the impeller 3, blood can flow completely in the cavity formed by the impeller 3, and the condition that blood flows into the gap between the impeller 3 and the pump shell 1 from the gap between the inlet of the impeller 3 and the adjacent impeller blades is prevented, so that the damage to blood cells is reduced, and the hemolytic performance is improved.
As shown in fig. 9 and 10, the cross section of the spiral groove 302 includes a first edge ao, a second edge ob, a third edge co ', a fourth edge o'd, and a bottom edge bd, where the first edge ao intersects the second edge ob at a point o, and the third edge co ' intersects the fourth edge o'd at a point o '; when the impeller blade 301 does not rotate, the suction surface SS of the impeller blade 301 contacts with the o point, the pressure surface PS of the impeller blade 301 contacts with the third edge co', and the end surface of the impeller blade 301 contacts with the bottom edge bd; the suction surface SS of the impeller blade 301 forms an angle ψ with the first edge ao, and the pressure surface PS of the impeller blade 301 forms an angle θ with the fourth edge o'd; the impeller blades 301 are subjected to centrifugal force generated by rotation of the impeller blades 301The combined forces such as centrifugal force and forces in various aspects expand the impeller blades 301 outward, bringing the suction surface SS of the impeller blades 301 into contact with the first edge ao, bringing the pressure surface PS of the impeller blades 301 into contact with the fourth edge o'd, and bringing the end surfaces of the impeller blades 301 away from the bottom edge bd. The suction surface SS of the impeller blade 301 and the first edge ao are clamped at an angle ψ 'when ψ' =0 0 The pressure surface PS of the impeller blade 301 and the fourth edge o'd have an angle θ ', at which θ ' =0 0 When the impeller blade 301 rotates, the distance h from the end surface to the bottom bd of the impeller blade 301 is 1/9 to 1/7 of the diameter of the rotating shaft 6.
As shown in fig. 11 and 12, the inner wall of the pump casing 1 is provided with a diversion trench 101, and two ends of the diversion trench 101 are communicated with the upper chambers at two sides of the impeller 3. The guiding gutter quantity is 4, and blood entering guiding gutter can realize the cooling effect, avoids the condition emergence that the too high temperature caused blood cell damage.
For convenient assembly, the inner core is installed in the pump shell 1 in an interference manner, the inner core is provided with a groove, the inner core is internally provided with the diversion trench 101, the inner core is only required to be installed in the pump shell 1, and the edge of the impeller blade 301 is attached to the groove of the inner core through the centrifugal force generated by the rotation of the impeller blade 301. The inlet of the axial flow blood pump is positioned in the left ventricle, the outlet is positioned in the aortic arch, the arc-shaped curved surface of the outlet is in smooth transition with the aortic arch to simulate the physiological structure of the aortic arch, and blood is completely and smoothly pumped into the main artery from the left ventricle.
It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. The aortic puncture type axial flow blood pump with the hemming blade structure is characterized by comprising a pump shell (1), guide vanes (2, 7), an impeller (3), a driving device and a rotating shaft (6);
an upper cavity and a lower cavity which are not communicated with each other are arranged in the pump shell (1), one end of the upper cavity is an inlet, the other end of the upper cavity is an outlet, a driving device is arranged in the lower cavity, an output shaft of the driving device is connected with a rotating shaft (6), the rotating shaft (6) penetrates into the upper cavity, an impeller (3) is arranged on the rotating shaft (6) in the upper cavity, guide vanes (2, 7) arranged on the pump shell (1) are respectively arranged on two sides of the impeller (3), and the rotating shaft (6) penetrates through the guide vanes (2, 7);
the impeller (3) comprises impeller blades (301), and the impeller blades (301) are spirally distributed on the rotating shaft (6); the rotating shaft (6) is provided with a spiral groove (302), and the impeller blades (301) are movably arranged in the spiral groove (302); a groove is formed in the inner wall of the pump shell (1) where the impeller (3) is arranged, and the edge of the impeller blade (301) is attached to the groove through centrifugal force generated by rotation of the impeller blade (301); the impeller blades (301) are folded edges, and the wrap angle of the impeller blades (301) is smaller than 180 degrees; the edge folding blade comprises a first bending body (301-1) and a second bending body (301-2), one end of the first bending body (301-1) is positioned in a spiral groove (302), a bending angle is arranged between the other end of the first bending body (301-1) and one end of the second bending body (301-2), a chamfer is arranged at the other end of the second bending body (301-2), adjacent impeller blades in the spiral groove (302) are tightly matched through centrifugal force generated by rotation of the edge folding blade, and the other end of the second bending body (301-2) of the edge folding blade is tightly matched with the bending angle of the adjacent edge folding blade; when the impeller (3) does not rotate, the second bending body (301-2) forms an acute angle with the axis of the rotating shaft (6)βThe second bending body (301-2) is inclined towards the direction of the rotating shaft (6); in the impeller (3) not rotatingWhen the impeller is in motion, gaps are reserved between adjacent impeller blades in the spiral groove (302), and gaps are reserved between the other end of the second bending body (301-2) of the edge folding blade and the bending angle of the adjacent edge folding blade.
2. The aortic puncture type axial flow blood pump with the hemming blade structure according to claim 1, wherein the inner side of the first bending body (301-1) and the inner side of the second bending body (301-2) are smoothly transited for reducing blood damage.
3. The aortic puncture type axial flow blood pump with the hemming blade structure according to claim 1, wherein the outlet at the other end of the upper chamber is an arc-shaped curved surface, and the arc-shaped curved surface is in smooth transition with the aortic arch.
4. The aortic puncture type axial flow blood pump with the hemming blade structure according to claim 1, wherein the inner wall of the pump housing (1) is provided with a diversion trench (101), and two ends of the diversion trench (101) are communicated with upper chambers at two sides of the impeller (3).
5. The aortic puncture type axial flow blood pump having the hemming blade structure according to claim 1, wherein one end of the impeller blade (301) is rotated in the spiral groove (302) and then moved to the outside by centrifugal force generated by rotation of the impeller blade (301).
6. The hemming blade structure aortic puncturing axial flow blood pump according to claim 5 wherein the cross section of the helical groove (303) includes a first edge ao, a second edge ob, a third edge co ', a fourth edge o'd and a bottom bd, the first edge ao intersects the second edge ob at a point o, the third edge co ' intersects the fourth edge o'd at a point o '; when the impeller blade (301) does not rotate, the suction surface SS of the impeller blade (301) is in point contact with o, the pressure surface PS of the impeller blade (301) is in contact with a third edge co', and the end surface of the impeller blade (301) is in contact with a bottom edge bd; the suction surface SS of the impeller blade (301) is brought into contact with the first edge ao, the pressure surface PS of the impeller blade (301) is brought into contact with the fourth edge o'd, and the end surface of the impeller blade (301) is separated from the bottom edge bd by centrifugal force generated by rotation of the impeller blade (301).
7. The aortic puncture type axial flow blood pump having the hemming blade structure according to claim 6, wherein when the impeller blade (301) rotates, a distance h from an end surface to a bottom side bd of the impeller blade (301) is 1/9~1/7 of a diameter of the rotation shaft (6).
8. The aortic puncture type axial flow blood pump with the hemming blade structure according to claim 1, wherein the surfaces of the groove of the pump housing (1) and the impeller (3) are plated with medical lubrication wear-resistant materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210056154.7A CN114432588B (en) | 2022-01-18 | 2022-01-18 | Aortic puncture type axial flow blood pump with edge folding blade structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210056154.7A CN114432588B (en) | 2022-01-18 | 2022-01-18 | Aortic puncture type axial flow blood pump with edge folding blade structure |
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| CN114432588B true CN114432588B (en) | 2023-11-10 |
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| EP2298373A1 (en) * | 2009-09-22 | 2011-03-23 | ECP Entwicklungsgesellschaft mbH | Fluid pump with at least one turbine blade and a seating device |
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| CN114432588A (en) | 2022-05-06 |
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