CN-121987939-A - Driving device and blood pump

Abstract

The invention relates to a driving device and a blood pump, wherein the driving device is used for driving an impeller to rotate and comprises a shell component and a rotating shaft, the shell component is provided with a mounting hole, the rotating shaft comprises a first shaft section which is fixedly connected with the impeller and can be rotatably penetrated through the mounting hole, an arc-shaped convex surface is arranged on the circumference of the first shaft section, at least part of the arc-shaped convex surface is positioned in the mounting hole, the inflection point of the arc-shaped convex surface is opposite to the hole wall of the mounting hole, the clearance between the arc-shaped convex surface and the hole wall of the mounting hole is the smallest at the inflection point of the arc-shaped convex surface, and when the first shaft section is contacted with the hole wall of the mounting hole, the inflection point of the arc-shaped convex surface is contacted with the hole wall of the mounting hole. The rotating shafts of the blood pump and the driving device have lower wear degree.

Inventors

• XIE DUANQING
• YU SHUNZHOU

Assignees

• 深圳核心医疗科技股份有限公司

Dates

Publication Date

20260508

Application Date

20220610

Claims (20)

1. 1. A drive apparatus for driving rotation of an impeller, the drive apparatus comprising: A housing assembly provided with a mounting hole, and The rotary shaft comprises a first shaft section and a second shaft section connected with one end of the first shaft section, the first shaft section can be rotatably arranged in the mounting hole in a penetrating mode, one end, away from the second shaft section, of the first shaft section is used for being fixedly connected with the impeller, an arc-shaped convex surface is arranged on the circumference of the first shaft section and protrudes radially in the direction away from the axis of the first shaft section, the position, with the largest axial distance, of the arc-shaped convex surface relative to the first shaft section is the inflection point of the arc-shaped convex surface, at least part of the arc-shaped convex surface is located in the mounting hole, the inflection point is opposite to the hole wall of the mounting hole, a gap between the arc-shaped convex surface and the hole wall of the mounting hole is the smallest at the inflection point, and the inflection point is in contact with the hole wall of the mounting hole when the first shaft section is in contact with the hole wall of the mounting hole.
2. 2. The driving device according to claim 1, wherein the arc-shaped convex surface is provided with a first arc-shaped surface part and a second arc-shaped surface part connected with the first arc-shaped surface part, the first arc-shaped surface part is positioned in the mounting hole, the second arc-shaped surface part and the first arc-shaped surface part are arranged along the axial direction of the first shaft section, the connection part of the second arc-shaped surface part and the first arc-shaped surface part is the inflection point, the distance from the first arc-shaped surface part to the axis of the first shaft section gradually increases along the axial direction of the first shaft section and in the direction approaching to the impeller, and the distance from the second arc-shaped surface part to the axis of the first shaft section gradually decreases.
3. 3. The drive of claim 2, wherein the arcuate convex surface is entirely within the mounting hole, wherein the width of the gap between the first arcuate surface portion and the wall of the mounting hole is gradually reduced and the width of the gap between the second arcuate surface portion and the wall of the mounting hole is gradually increased along the axis of the first shaft section and in a direction toward the impeller; or the second cambered surface part is positioned outside the mounting hole.
4. 4. The drive of claim 1, wherein the arcuate convex surface is disposed continuously one revolution about the axis of the first shaft segment or a plurality of spaced arcuate convex surfaces are disposed axially of the first shaft segment.
5. 5. The drive of claim 1, wherein a distance between the inflection point of the arcuate convex surface and a plane of the mounting hole where an opening near an end of the impeller is located is defined along an axial direction of the first shaft section, and the distance is H, and the range of H is equal to or less than 0.2mm.
6. 6. The driving device according to claim 1, wherein an arc-shaped concave surface portion opposite to the arc-shaped convex surface is provided on a wall of the mounting hole, a curvature of the concave surface portion is smaller than that of the arc-shaped convex surface, and when the first shaft section is in contact with the wall of the mounting hole, an inflection point of the arc-shaped convex surface is in contact with the concave surface portion.
7. 7. The driving device according to claim 6, wherein the concave portion is located opposite to the second arcuate portion in a curvature smaller than that of the second arcuate portion, and the hole wall of the mounting hole opposite to the first arcuate portion is a straight wall extending parallel to an axis along the first shaft section.
8. 8. The driving device according to claim 1, wherein the mounting hole has a first hole portion and a second hole portion which are communicated, the aperture of the first hole portion is constant, the aperture of the second hole portion is gradually reduced in a direction approaching the first hole portion, the first shaft section is penetrated through the first hole portion and the second hole portion, an inflection point of the arc-shaped convex surface is opposite to a wall of the first hole portion, and when the first shaft section is in contact with the wall of the mounting hole, the inflection point of the arc-shaped convex surface is in contact with the wall of the first hole portion.
9. 9. The drive of claim 1, wherein the shaft further comprises a third shaft section connected to the second shaft section distal from the first shaft section; The shell assembly is further provided with a limiting cavity and a penetrating hole, the limiting cavity is communicated with the mounting hole, the penetrating hole is communicated with the limiting cavity, the second shaft section can be rotatably contained in the limiting cavity, the third shaft section can be rotatably arranged in the penetrating hole in a penetrating mode, and the cross section size of the second shaft section is larger than the aperture of the mounting hole and the aperture of the penetrating hole.
10. 10. The driving device according to claim 9, wherein the housing assembly further comprises a housing cavity, the housing cavity is communicated with the through hole, the rotating shaft further comprises a fourth shaft section connected with one end, far away from the second shaft section, of the third shaft section, the fourth shaft section is housed in the housing cavity and is thinner than the third shaft section, the driving device further comprises a rotor and a stator housed in the housing cavity, the rotor is fixedly connected with the fourth shaft section, the stator can drive the rotor to rotate, the rotor can drive the rotating shaft to rotate, and the fourth shaft section is at least partially housed in the stator.
11. 11. The driving device according to claim 10, wherein the rotor has magnetism, the stator includes a first stator unit and a second stator unit, the first stator unit and the second stator unit are each capable of generating a rotating magnetic field for driving the rotor to rotate, the first stator unit, the rotor and the second stator unit are sequentially arranged along an axis of the fourth shaft section, the fourth shaft section is rotatably penetrating the first stator unit, the rotor is fixedly connected to one end of the fourth shaft section far away from the third shaft section, and the second stator unit and the rotating shaft are arranged at intervals along the axis of the fourth shaft section, so that the fourth shaft section does not penetrate into the second stator unit; The first stator unit and the second stator unit are respectively provided with a plurality of coil windings, the plurality of coil windings of the first stator unit are arranged around the fourth shaft section, the plurality of coil windings of the second stator unit are arranged around the axis of the fourth shaft section, the coil windings of the second stator unit and the coil windings of the first stator unit are respectively provided with a magnetic column, and the cross section size of the magnetic column of the second stator unit is larger than that of the first stator unit.
12. 12. The driving device according to claim 9, wherein two cavity wall surfaces of the limiting cavity in the axial direction of the rotating shaft are a first limiting surface and a second limiting surface, the second shaft section is located between the first limiting surface and the second limiting surface, a distance between the first limiting surface and the second limiting surface is larger than the axial length of the second shaft section, or two end portions of the second shaft section in the axial direction are provided with chamfers.
13. 13. A drive apparatus for driving rotation of an impeller, the drive apparatus comprising: A housing assembly provided with a mounting hole, and The rotating shaft comprises a first shaft section which is fixedly connected with the impeller and can rotationally penetrate through the mounting hole, the first shaft section is provided with a first column part which is accommodated in the shell component and a second column part which is connected with the first column part and is positioned outside the shell component, the second column part is fixedly connected with the impeller, and the second column part and the first column part are coaxially arranged; The axial direction of the first shaft section is along the axial direction of the first shaft section and is towards the direction close to the impeller, the distance from the first arc surface to the axis of the first shaft section is gradually increased, the position, with the largest axial distance from the first arc surface to the first shaft section, of the first arc surface is an inflection point of the arc convex surface, the position of the first arc surface is opposite to the hole wall of the mounting hole, the clearance between the arc convex surface and the hole wall of the mounting hole is minimum at the inflection point, and when the first shaft section is in contact with the hole wall of the mounting hole, the inflection point is in contact with the hole wall of the mounting hole.
14. 14. The drive of claim 13, wherein the inflection point is flush with a plane of the mounting hole where an opening of the mounting hole near an end of the impeller is located.
15. 15. The driving device according to claim 13, wherein a peripheral surface of the second column portion near an end of the first column portion is a cylindrical surface, the first arc surface portion is located at an end of the first column portion near the second column portion, the first arc surface portion is connected to the cylindrical surface, and a connection portion of the first arc surface portion and the cylindrical surface is the inflection point.
16. 16. The driving device according to claim 13, wherein the mounting hole has a first hole portion and a second hole portion which are communicated, the aperture of the first hole portion is constant, the aperture of the second hole portion is gradually reduced in a direction approaching the first hole portion, the first shaft section is provided to penetrate the first hole portion and the second hole portion, the inflection point is opposite to the wall of the first hole portion, and when the first shaft section is in contact with the wall of the mounting hole, the inflection point is in contact with the wall of the first hole portion.
17. 17. The drive of claim 13, wherein the shaft further comprises a second shaft section connected to one end of the first shaft section, and a third shaft section connected to the second shaft section distal from the first shaft section, one end of the first shaft section distal from the second shaft section being adapted to be fixedly coupled to the impeller; The shell assembly is further provided with a limiting cavity and a penetrating hole, the limiting cavity is communicated with the mounting hole, the penetrating hole is communicated with the limiting cavity, the second shaft section can be rotatably contained in the limiting cavity, the third shaft section can be rotatably arranged in the penetrating hole in a penetrating mode, and the cross section size of the second shaft section is larger than the aperture of the mounting hole and the aperture of the penetrating hole.
18. 18. The driving device according to claim 17, wherein the housing assembly further comprises a housing cavity, the housing cavity is communicated with the through hole, the rotating shaft further comprises a fourth shaft section connected with one end, far away from the second shaft section, of the third shaft section, the fourth shaft section is housed in the housing cavity and is thinner than the third shaft section, the driving device further comprises a rotor and a stator housed in the housing cavity, the rotor is fixedly connected with the fourth shaft section, the stator can drive the rotor to rotate, the rotor can drive the rotating shaft to rotate, and the fourth shaft section is at least partially housed in the stator.
19. 19. The drive device according to claim 18, wherein the rotor has magnetism, the stator includes a first stator unit and a second stator unit, the first stator unit and the second stator unit are each capable of generating a rotating magnetic field for driving the rotor to rotate, the first stator unit, the rotor and the second stator unit are sequentially arranged along an axis of the fourth shaft section, the fourth shaft section is rotatably penetrating the first stator unit, the rotor is fixedly connected to an end of the fourth shaft section far away from the third shaft section, and the second stator unit and the rotating shaft are arranged at intervals along the axis of the fourth shaft section, so that the fourth shaft section does not penetrate into the second stator unit; The first stator unit and the second stator unit are respectively provided with a plurality of coil windings, the plurality of coil windings of the first stator unit are arranged around the fourth shaft section, the plurality of coil windings of the second stator unit are arranged around the axis of the fourth shaft section, the coil windings of the second stator unit and the coil windings of the first stator unit are respectively provided with a magnetic column, and the cross section size of the magnetic column of the second stator unit is larger than that of the first stator unit.
20. 20. A blood pump comprising an impeller and the drive device of any one of claims 1-19, the impeller being fixedly connected to the first shaft section, the impeller being rotatable with the shaft.

Description

Driving device and blood pump Technical Field The invention relates to the technical field of medical equipment, in particular to a driving device and a blood pump. Background An intravascular blood pump is a blood pumping device that can be advanced into a patient's heart through the patient's blood vessel, with the intravascular blood pump being positioned within an opening of a heart valve so that blood can flow through the blood pump and into an arterial blood vessel. The blood pump comprises a driving device and an impeller, wherein the impeller is fixed on a rotating shaft of the driving device, and the impeller is driven to rotate through the rotating shaft, but the rotating shaft of the traditional driving device is usually worn greatly. Disclosure of Invention In view of this, it is necessary to provide a driving device and a blood pump in which the wear degree of the rotation shaft is low. A drive apparatus for driving rotation of an impeller, the drive apparatus comprising: A housing assembly provided with a mounting hole, and The rotating shaft comprises a first shaft section which is fixedly connected with the impeller and can rotationally penetrate through the mounting hole, an arc-shaped convex surface is arranged on the circumference of the first shaft section, at least part of the arc-shaped convex surface is located in the mounting hole, the inflection point of the arc-shaped convex surface is opposite to the hole wall of the mounting hole, the clearance between the arc-shaped convex surface and the hole wall of the mounting hole is minimum, and when the first shaft section is in contact with the hole wall of the mounting hole, the inflection point of the arc-shaped convex surface is in contact with the hole wall of the mounting hole. In one embodiment, a distance between the inflection point of the arc-shaped convex surface and a plane of the mounting hole, where the opening is located at one end of the mounting hole, which is close to the impeller, is defined along the axial direction of the first shaft section, wherein the distance is H, and the value range of H is less than or equal to 0.2mm. In one embodiment, the arcuate convex surface has a first arcuate surface portion located in the mounting hole, the distance from the first arcuate surface portion to the axis of the first shaft section gradually increases along the axial direction of the first shaft section and in a direction approaching the impeller, and an inflection point of the arcuate convex surface is located on the first arcuate surface portion. In one embodiment, the first shaft section is provided with a first column part accommodated in the shell component and a second column part connected with the first column part and positioned outside the shell component, the second column part is used for being fixedly connected with the impeller, the second column part and the first column part are coaxially arranged, the peripheral surface of one end of the second column part, which is close to the first column part, is a cylindrical surface, the arc-shaped convex surface is positioned at one end of the first column part, which is close to the second column part, the arc-shaped convex surface is connected with the cylindrical surface, the connection part of the arc-shaped convex surface and the cylindrical surface is the inflection point of the arc-shaped convex surface, and the inflection point of the arc-shaped convex surface is flush with the plane of the mounting hole, which is close to the opening of one end of the impeller; Or the arc convex surface is also provided with a second arc surface part connected with the first arc surface part, the second arc surface part and the first arc surface part are arranged along the axial direction of the first shaft section, the connection part of the second arc surface part and the first arc surface part is the inflection point of the arc convex surface, and the distance from the second arc surface part to the axis of the first shaft section gradually decreases along the axial direction of the first shaft section and towards the direction close to the impeller. In one embodiment, an arc-shaped concave surface portion opposite to the arc-shaped convex surface is arranged on the hole wall of the mounting hole, the bending radian of the concave surface portion is smaller than that of the arc-shaped convex surface, and when the first shaft section is in contact with the hole wall of the mounting hole, the inflection point of the arc-shaped convex surface is in contact with the concave surface portion. In one embodiment, the mounting hole has a first hole portion and a second hole portion that are communicated, the aperture of the first hole portion is constant, the aperture of the second hole portion is gradually reduced along the direction close to the first hole portion, the first shaft section penetrates through the first hole portion and the second hole portion, the inflection point o