CN216136569U - Aorta internal circulation auxiliary blood pump rotor - Google Patents
Aorta internal circulation auxiliary blood pump rotor Download PDFInfo
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- CN216136569U CN216136569U CN202121930094.4U CN202121930094U CN216136569U CN 216136569 U CN216136569 U CN 216136569U CN 202121930094 U CN202121930094 U CN 202121930094U CN 216136569 U CN216136569 U CN 216136569U
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Abstract
The utility model discloses an aorta internal circulation auxiliary blood pump rotor. The blood pump rotor comprises a hub, two equal-size blades and a shaft mounting hole; wherein the hub is flared from the leading end to the trailing end; the blade comprises a blade root surface close to one side of the surface of the hub, a blade tip surface arranged on one side far away from the surface of the hub and two side surfaces positioned between the blade root surface and the blade tip surface; the blades are fixedly arranged on the hub, blade root surfaces of the two blades are symmetrically arranged on the surface of the hub around the central axis of the hub, the radius of the blade tip from the front edge of the blade close to the front end of the hub to the tail edge of the blade close to the tail end of the hub is equal in diameter, and the height of the blade is uniformly reduced from the front edge of the blade to the tail edge of the blade; the axle mounting hole is disposed in the hub extending from the trailing end to the leading end of the hub. The utility model relates to an axial-flow type and micro blood pump rotor implanted in aorta, which has higher efficiency, pressure rise, flow characteristic and lower hemolysis level caused by mechanical force.
Description
Technical Field
The utility model relates to an aorta internal circulation auxiliary blood pump rotor, in particular to a blood pump rotor of a circulation auxiliary device implanted in an aorta for assisting a circulatory system of a heart failure patient, and belongs to the technical field of aorta internal circulation auxiliary devices of medical instruments.
Background
Acute and chronic heart failure caused by various reasons is one of the main death causes of heart disease patients, and is one of the most common and most harmful diseases in cardiovascular diseases. Heart failure is the only growing heart disease worldwide, with over 2600 million heart failure patients currently worldwide. For patients with end-stage critical heart failure, the medicine has poor treatment effect and high mortality rate, and artificial heart and heart transplantation are two effective treatment means. However, due to the extreme scarcity of heart donors, the demand of patients is far from being met, and a large number of heart patients die while waiting for heart transplantation. The artificial heart circulation auxiliary device is one of the standardized treatment modes of heart failure recommended by international guidelines, but due to great research and development difficulty, products available in China are almost not available, and a large number of patients cannot be treated.
The circulation auxiliary device adopts a mechanical means to assist and support the blood pumping function of the heart, maintains and improves the blood circulation of the human body and is divided into a long-term implantation type and a short-term and medium-term auxiliary type. The more studied blade-type blood pumps are divided into a centrifugal type and an axial type, and compared with the first generation of pulsating circulation auxiliary devices, the more studied blade-type blood pumps have the advantages that: simple structure, small volume, small blood contact area, good antithrombotic property, easy implantation and the like. The centrifugal magnetic suspension blood pump is relatively easy to realize technically, so that the conventional long-term implantation circulation auxiliary device mainly adopts a centrifugal blood pump. The axial-flow blood pump is mainly used for interventional short-term and medium-term circulatory assistance due to the characteristics of small volume and axial blood flow method. The axial-flow blood pump has the main advantages of small volume, large flow and high efficiency.
The working principle of the aorta internal circulation auxiliary blood pump is that the blood flow speed in the aorta is accelerated by the rotary work of a blood pump rotor implanted in a percutaneous mode to play a role in assisting a patient circulation system, and further the effect of unloading load of a ventricle is played. Since such blood pumps need to have a volume small enough to be implanted in the aorta while still providing sufficient pressure rise and flow to be effective for circulatory assistance, the design requirements for the blood pump rotor are particularly high, requiring less damage to the blood on the basis of ensuring the efficiency of the blood pump rotor. For example, the mechanical force of the rotation of the rotor of the blood pump on the blood can cause great damage to red blood cells, hemolysis and even gastrointestinal bleeding, and the flow stagnation area in the blood pump is easy to generate thrombus, which can cause pump stalling or embolism of downstream organs, and the thrombus and hemolysis can seriously endanger the life of a patient.
Therefore, the utility model of a blood pump rotor with high efficiency and low damage level to blood is an important ring in the design of the auxiliary device for the intra-aortic circulation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an aorta internal circulation auxiliary blood pump rotor, which is an axial-flow type blood pump rotor arranged in an aorta and used for accelerating the speed of blood in the aorta. The blood pump rotor is implanted into aorta, can provide blood pressure rise and flow meeting clinical requirements, and has small damage to blood.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an aorta internal circulation auxiliary blood pump rotor comprises a hub, two equal-size blades and a shaft mounting hole; wherein the content of the first and second substances,
the hub is in an expansion shape from the front end to the tail end;
the blade comprises a blade root surface close to one side of the surface of the hub, a blade tip surface arranged on one side far away from the surface of the hub and two side surfaces positioned between the blade root surface and the blade tip surface;
the blades are fixedly arranged on the hub, blade root surfaces of the two blades are symmetrically arranged on the surface of the hub around the central axis of the hub, the radius of the blade tip from the front edge of the blade close to the front end of the hub to the tail edge of the blade close to the tail end of the hub is equal in diameter, and the height of the blade is uniformly reduced from the front edge of the blade to the tail edge of the blade;
the axle mounting hole is disposed in the hub extending from the trailing end to the leading end of the hub.
Preferably, the blades are integrally formed with the hub.
Preferably, the front end of the hub is of a hemispherical structure.
Preferably, the blood pump rotor is tightly matched with a motor shaft or welded together through the shaft mounting hole.
Preferably, the height of the blade is 2 mm-1 mm from the front edge of the blade to the tail edge of the blade; the radius of the blade tip is 1.9-2.9 mm; the blade installation angle of the blade root surface is-300 to-50 degrees from the front edge of the blade to the tail edge of the blade, and the thickness of the blade is 0.4 to 0.85 mm; the blade installation angle of the blade tip surface is-265 to-65 degrees from the blade front edge to the blade tail edge, and the thickness of the blade is 0.2 to 0.95 mm.
Preferably, the length of the hub is 8-15 mm; the length of the blade is 6-10 mm; the radius of the tail end of the hub is 1-2 mm; the radius of the shaft mounting hole is 0.5 mm.
Preferably, the blood pump rotor is made of titanium alloy or 316L stainless steel or hard polymer medical material.
The utility model has the beneficial effects that:
the utility model relates to an axial-flow type and micro blood pump rotor placed in an aorta, which has the advantages of higher efficiency, pressure rise, flow characteristic and lower hemolysis level caused by mechanical force.
Drawings
Fig. 1 is a schematic structural diagram of an aorta internal circulation auxiliary blood pump rotor.
Fig. 2 is a schematic structural view of a rotor blade of an aortic internal circulation assist blood pump according to the present invention, in which (a) shows the shape of the root surface of the blade, and (b) shows the shape of the tip surface of the blade.
Fig. 3 is a view showing the blade setting angles of the rotors of the aortic internal circulation assist blood pump of the present invention, in which (a) shows the distribution of the blade setting angles of the root surfaces of the blades from the leading edges of the blades to the trailing edges of the blades, and (b) shows the distribution of the blade setting angles of the tip surfaces of the blades from the leading edges of the blades to the trailing edges of the blades.
Fig. 4 is a diagram showing the thickness of the blade of the rotor of the aortic internal circulation auxiliary blood pump of the present invention, (a) shows the distribution of the thickness of the blade on the blade root surface from the blade leading edge to the blade trailing edge, and (b) shows the distribution of the thickness of the blade on the blade tip surface from the blade leading edge to the blade trailing edge.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following.
The utility model discloses an aorta internal circulation auxiliary blood pump rotor which is a miniature and axial flow type blood pump rotor, the structure of the aorta internal circulation auxiliary blood pump rotor is shown in figure 1, and the aorta internal circulation auxiliary blood pump rotor comprises a hub 1, blades 2 and a shaft mounting hole 3; hub is the expansion type from front end (blood inflow department) to tail end (blood outflow department), and hub's front end is hemispherical structure, and this kind of shape design both has had the hydraulics characteristic that is favorable to promoting the blood pump, can make the radius of hub tail end rather than the motor radius phase-match who connects again, avoids blood to meet the condition on flow area sudden change and the direct impact of blood to the motor terminal surface at hub tail end and motor juncture. Two blades with the same shape and size are fixedly installed on the hub, for example, the hub and the blades can be manufactured in an integrated manner. The blade comprises a blade root surface 4 close to one side of the surface of the hub, a blade tip surface 5 arranged on one side far away from the surface of the hub and two side surfaces positioned between the blade root surface and the blade tip surface, wherein the blade root surfaces of the two blades are symmetrically arranged on the surface of the hub around the central axis of the hub. As shown in fig. 2, the structure of the blade when it is developed into a flat shape is schematically shown, in which fig. 2(a) shows the shape of the root surface, fig. 2(b) shows the shape of the tip surface, the blade leading edge 6 is near the front end of the hub, the blade trailing edge 7 is near the rear end of the hub, and the tip radius from the blade leading edge to the blade trailing edge is equal in diameter. The tip radius here refers to the width of the blade on both sides of the blade mid chord 8. As seen from the structure shown in fig. 1, the blade height, which is the distance from the tip surface 5 to the root surface 4 in a direction perpendicular to the central axis of the hub, decreases uniformly from the leading edge to the trailing edge of the blade. Shaft mounting hole 3 sets up in wheel hub 1, extends to the front end from wheel hub 1's tail end, and the blood pump rotor passes through shaft mounting hole 3 and motor shaft tight fit or welds together.
In the aorta internal circulation auxiliary blood pump rotor, the blade profile, the installation angle, the thickness and other factors of the blades are fully designed according to the factors of efficiency, pressure rise, flow-induced hemolysis and the like. Wherein the length of the blood pump rotor (namely the length of the hub) is 8-15 mm; the length of the blade is 6-10 mm; the radius of the blade tip is 1.9-2.9 mm; the height of the blade is 2 mm-1 mm from the front edge of the blade to the tail edge of the blade; the blade installation angle of the blade root surface is-300 to-50 degrees from the front edge of the blade to the tail edge of the blade, and the thickness of the blade is 0.4 to 0.85 mm; the blade installation angle of the blade tip surface is-265 to-65 degrees from the front edge of the blade to the tail edge of the blade, and the thickness of the blade is 0.2 to 0.95 mm; the front end of the hub is of a hemispherical structure, and the radius of the tail end of the hub is 1-2 mm; the radius of the shaft mounting hole is 0.5mm, and the shaft mounting hole is tightly matched with or welded together with a motor shaft.
As shown in FIGS. 3 to 4, as an embodiment of the rotor of the aortic internal circulation auxiliary blood pump of the present invention, the distribution of the blade setting angle of the blade root surface from the leading edge of the blade to the trailing edge of the blade is shown in FIG. 3(a), from-300 degrees of the leading edge of the blade to-50 degrees of the trailing edge of the blade, i.e., the blade setting angle of the blade root surface from the leading edge of the blade to the trailing edge of the blade is from-300 to-50 degrees. FIG. 3(b) shows the distribution of the blade setting angle of the blade tip surface from the leading edge of the blade to the trailing edge of the blade, from-265 degrees at the leading edge of the blade to-65 degrees at the trailing edge of the blade, i.e., the blade setting angle of the blade tip surface is from-265 degrees to-65 degrees from the leading edge of the blade to the trailing edge of the blade. The distribution of blade thickness at the root of the blade from the leading edge of the blade to the trailing edge of the blade is shown in fig. 4(a), from 0.2mm at the leading edge of the blade to a maximum thickness of 0.95mm at a position 3.75mm in length of the blade to 0.2mm at the trailing edge of the blade. The distribution of blade thickness of the tip face from the leading edge of the blade to the trailing edge of the blade is shown in fig. 4(b), from 0.42mm at the leading edge of the blade to a maximum thickness of 0.85mm at a position 3.75mm in length of the blade to 0.62mm at the trailing edge of the blade.
The following beneficial effects can be realized by adopting the blade parameters of the embodiment: the rotation speed is 25000 r/min, the flow is 3L/min, the pressure rise reaches 60mmHg, the efficiency is 23 percent, and the hemolysis level is 0.05 g/100L.
The blood pump rotor is made of titanium alloy, 316L stainless steel and other metal materials with good biocompatibility or hard polymer medical materials (including but not limited to polycarbonate, low-density polyethylene, polyvinyl chloride and ethylene-vinyl acetate copolymer) through machining or 3D printing.
Claims (7)
1. An aorta internal circulation auxiliary blood pump rotor is characterized by comprising a hub, two equal-size blades and a shaft mounting hole; wherein the content of the first and second substances,
the hub is in an expansion shape from the front end to the tail end;
the blade comprises a blade root surface close to one side of the surface of the hub, a blade tip surface arranged on one side far away from the surface of the hub and two side surfaces positioned between the blade root surface and the blade tip surface;
the blades are fixedly arranged on the hub, blade root surfaces of the two blades are symmetrically arranged on the surface of the hub around the central axis of the hub, the radius of the blade tip from the front edge of the blade close to the front end of the hub to the tail edge of the blade close to the tail end of the hub is equal in diameter, and the height of the blade is uniformly reduced from the front edge of the blade to the tail edge of the blade;
the axle mounting hole is disposed in the hub extending from the trailing end to the leading end of the hub.
2. The intra-aortic circulation assist blood pump rotor of claim 1, wherein the blades are integrally formed with the hub.
3. The intra-aortic circulation assist blood pump rotor of claim 1, wherein the hub has a hemispherical front end.
4. The intra-aortic circulation auxiliary blood pump rotor of claim 1, wherein the blood pump rotor is tightly fitted or welded to a motor shaft through the shaft mounting hole.
5. The intra-aortic circulation auxiliary blood pump rotor as claimed in claim 1, wherein the height of the blade is 2mm to 1mm from the leading edge of the blade to the trailing edge of the blade; the radius of the blade tip is 1.9-2.9 mm; the blade installation angle of the blade root surface is-300 to-50 degrees from the front edge of the blade to the tail edge of the blade, and the thickness of the blade is 0.4 to 0.85 mm; the blade installation angle of the blade tip surface is-265 to-65 degrees from the blade front edge to the blade tail edge, and the thickness of the blade is 0.2 to 0.95 mm.
6. The intra-aortic circulation auxiliary blood pump rotor as claimed in claim 1, wherein the hub has a length of 8-15 mm; the length of the blade is 6-10 mm; the radius of the tail end of the hub is 1-2 mm; the radius of the shaft mounting hole is 0.5 mm.
7. The intra-aortic circulation auxiliary blood pump rotor as claimed in claim 1, wherein the blood pump rotor is made of titanium alloy or 316L stainless steel or hard polymer medical material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121930094.4U CN216136569U (en) | 2021-08-17 | 2021-08-17 | Aorta internal circulation auxiliary blood pump rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121930094.4U CN216136569U (en) | 2021-08-17 | 2021-08-17 | Aorta internal circulation auxiliary blood pump rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216136569U true CN216136569U (en) | 2022-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121930094.4U Active CN216136569U (en) | 2021-08-17 | 2021-08-17 | Aorta internal circulation auxiliary blood pump rotor |
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| CN (1) | CN216136569U (en) |
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2021
- 2021-08-17 CN CN202121930094.4U patent/CN216136569U/en active Active
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