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CN-121971798-A - Blood pump

CN121971798ACN 121971798 ACN121971798 ACN 121971798ACN-121971798-A

Abstract

The application relates to a blood pump, which comprises a runner pipe, a first pump device, a second pump device and a third pump device. The first pump device comprises a first motor and a first impeller connected with the first motor, the first motor is fixedly connected with the flow channel tube, the first impeller is arranged at the proximal end of the blood flow channel, the second pump device comprises a second motor and a second impeller connected with the second motor, the second impeller is arranged at the distal end of the blood flow channel, the third pump device comprises a third motor and a third impeller connected with the third motor, and the third impeller is arranged in the blood flow channel and is positioned between the first impeller and the second impeller. The blood pump of the application can reduce the diameter of the motor.

Inventors

  • DENG DAZHAO
  • CHEN SHIZHANG
  • YU SHUNZHOU

Assignees

  • 深圳核心医疗科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260212

Claims (13)

  1. 1. A blood pump, the blood pump comprising: The blood flow device comprises a flow channel tube, a blood flow control device and a control device, wherein a first blood flow opening is formed in the proximal end of the flow channel tube, and a second blood flow opening is formed in the distal end of the flow channel tube; the first pump device comprises a first motor and a first impeller connected with the first motor, wherein the first motor is fixedly connected with the flow channel pipe, and the first impeller is arranged at the proximal end of the blood flow channel; a second pump device comprising a second motor and a second impeller connected with the second motor, the second impeller being arranged at the far end of the blood flow channel, and The third pump device comprises a third motor and a third impeller connected with the third motor, and the third impeller is arranged in the blood flow channel and is positioned between the first impeller and the second impeller.
  2. 2. The blood pump of claim 1, wherein the blood pump is for a right heart, the first pump device is configured to be disposed in a superior vena cava or inferior vena cava, the second pump device is configured to be disposed in a pulmonary artery, and the third pump device is configured to be disposed in a right atrium.
  3. 3. The blood pump of claim 1, wherein the flow channel tube comprises a proximal rigid tube, a proximal flexible tube, a middle rigid tube, a distal flexible tube and a distal rigid tube which are sequentially connected and communicated, wherein the proximal rigid tube is provided with the first blood flow opening and is fixedly connected with the distal end of the first motor, and the distal rigid tube is provided with the second blood flow opening, and wherein: The first impeller is arranged inside the proximal hard tube; the second impeller is arranged in the middle hard tube; the third impeller is disposed inside the distal stiffening tube.
  4. 4. A blood pump according to claim 3, characterized in that it has at least one of the following features: The axial length of the distal flexible tube is greater than the axial length of the proximal flexible tube; the deflection of the distal flexible tube is greater than the deflection of the proximal flexible tube; The proximal flexible tube is provided with a first elastic coil, one end of the first elastic coil is fixedly connected with the proximal hard tube, and the other end of the first elastic coil is fixedly connected with the middle hard tube; the distal flexible tube is provided with a second elastic coil, one end of the second elastic coil is fixedly connected with the middle hard tube, and the other end of the second elastic coil is fixedly connected with the distal hard tube.
  5. 5. The blood pump of claim 3 wherein the maximum outer diameter of the proximal flexible tube is the same as the maximum outer diameter of either the proximal rigid tube or the middle rigid tube and/or the maximum outer diameter of the distal flexible tube is the same as the maximum outer diameter of either the middle rigid tube or the distal rigid tube.
  6. 6. The blood pump according to any one of claims 1 to 5, wherein the second motor is provided in the blood flow path between the first impeller and the second impeller with a first fluid gap interposed between an outer surface of the second motor and an inner wall surface of the flow path tube, and/or, The third motor is arranged in the blood flow channel and is positioned between the first impeller and the third impeller, and a second fluid gap is arranged between the outer surface of the third motor and the inner wall surface of the flow channel tube at intervals.
  7. 7. The blood pump according to any one of claims 1 to 5, wherein a mounting bracket is provided inside the flow channel tube, the mounting bracket including a plurality of ribs arranged at intervals along a circumferential direction of the flow channel tube, the ribs connecting an inner wall surface of the flow channel tube and the second motor or the third motor; The ribs extend in the axial direction of the flow channel tube, the axial length of the ribs is larger than the radial width of the ribs, and/or the ribs are provided with proximal ends, the thickness of the proximal ends gradually decreases in the direction from the distal end to the proximal end of the flow channel tube, and the ribs are provided with distal ends, the thickness of the distal ends gradually decreases in the direction from the proximal end to the distal end of the flow channel tube.
  8. 8. The blood pump of claim 7, wherein the mounting bracket further comprises a retaining ring capable of being looped around an outer peripheral surface of the second motor or the third motor, and wherein the rib has a first side portion and a second side portion that are radially opposite to each other along the flow path tube, the first side portion being fixedly connected to an inner wall surface of the flow path tube, and the second side portion being fixedly connected to the outer peripheral surface of the retaining ring.
  9. 9. The blood pump of any one of claims 1 to 5, wherein the maximum power of the first motor is a first power, the maximum power of the second motor is a second power, the second power is less than the first power, and/or the maximum diameter of the first motor is a first diameter, the maximum diameter of the second motor is a second diameter, the second diameter is less than the first diameter.
  10. 10. The blood pump of any one of claims 1-5, wherein the maximum power of the first motor is a first power, the maximum power of the third motor is a third power, the third power is less than the first power, and/or the maximum diameter of the first motor is a first diameter, the maximum diameter of the third motor is a third diameter, the third diameter is less than the first diameter.
  11. 11. The blood pump of any one of claims 1 to 5, wherein the first motor comprises a first housing, a first stator, a first rotor and a first shaft mounted in the first housing, the first rotor is fixedly connected with the first shaft, the first shaft rotatably penetrates through the first housing and is fixedly connected with the first impeller, the second motor comprises a second housing, a second stator, a second rotor and a second shaft mounted in the second housing, the second rotor is fixedly connected with the second shaft, the second shaft rotatably penetrates through the second housing and is fixedly connected with the second impeller, The diameter of the second stator is smaller than the diameter of the first stator, the axial length of the second stator is larger than the axial length of the first stator, and/or, The diameter of the second rotor is smaller than that of the first rotor, and the axial length of the second rotor is larger than that of the first rotor.
  12. 12. The blood pump of any one of claims 1 to 5, wherein the first motor comprises a first housing, a first stator, a first rotor and a first shaft mounted in the first housing, the first rotor is fixedly connected with the first shaft, the first shaft rotatably penetrates through the first housing and is fixedly connected with the first impeller, the third motor comprises a third housing, a third stator, a third rotor and a third shaft mounted in the third housing, the third rotor is fixedly connected with the third shaft, the third shaft rotatably penetrates through the third housing and is fixedly connected with the third impeller, The diameter of the third stator is smaller than the diameter of the first stator, the axial length of the third stator is larger than the axial length of the first stator, and/or, The diameter of the third rotor is smaller than that of the first rotor, and the axial length of the third rotor is larger than that of the first rotor.
  13. 13. The blood pump according to any one of claims 1 to 5, wherein an outer surface of at least one of the second motor and the third motor includes a cylindrical surface and a proximal surface connected to a proximal end of the cylindrical surface, the cylindrical surface is provided with an annular groove extending in a circumferential direction thereof, an inner wall surface of the flow channel tube is fixedly provided with a mounting bracket fixedly engaged with the annular groove, and/or the proximal surface is provided as an arc surface.

Description

Blood pump Technical Field The application relates to the technical field of medical equipment, in particular to a blood pump. Background A blood pump is an artificial mechanical device that is pushed to the heart via a blood vessel to partially or fully replace the heart to perform work. However, in order to obtain a sufficient blood flow rate, a motor with a high power is generally required, and the diameter of the motor with a high power is also generally large, so that the difficulty in pushing the blood pump in a body is high. Disclosure of Invention In view of the above, it is necessary to provide a blood pump which can reduce the diameter of the motor as much as possible and further reduce the difficulty of pushing the blood pump in the body, while ensuring a large amount of blood pumped by the blood pump. In one embodiment of the blood pump provided by the application, the blood pump comprises a runner tube, a first pump device, a second pump device and a third pump device. The blood flow channel comprises a blood flow channel, a first pump device, a second pump device, a third pump device and a third pump device, wherein the blood flow channel is arranged at the far end of the blood flow channel, the blood flow channel is axially extended, the blood flow channel is used for communicating the first blood flow opening with the second blood flow opening, the first pump device comprises a first motor and a first impeller connected with the first motor, the first motor is fixedly connected with the blood flow channel, the first impeller is arranged at the near end of the blood flow channel, the second pump device comprises a second motor and a second impeller connected with the second motor, the second impeller is arranged at the far end of the blood flow channel, the third pump device comprises a third motor and a third impeller connected with the third motor, and the third impeller is arranged in the blood flow channel and is positioned between the first impeller and the second impeller. In one embodiment, the blood pump is for the right heart, the first pump device is configured to be disposed in the superior vena cava or inferior vena cava, the second pump device is configured to be disposed in the pulmonary artery, and the third pump device is configured to be disposed in the right atrium. In one embodiment, the flow channel tube comprises a proximal hard tube, a proximal flexible tube, a middle hard tube, a distal flexible tube and a distal hard tube which are sequentially connected and communicated, wherein the proximal hard tube is provided with the first blood flow opening and fixedly connected with the distal end of the first motor, and the distal hard tube is provided with the second blood flow opening; the second impeller is arranged in the middle hard tube; the third impeller is disposed inside the distal stiffening tube. In one embodiment, the maximum outer diameter of the proximal flexible tube is the same as the maximum outer diameter of either the proximal rigid tube or the middle rigid tube, and/or the maximum outer diameter of the distal flexible tube is the same as the maximum outer diameter of either the middle rigid tube or the distal rigid tube. In one embodiment, the blood pump further has at least one of the following features: The axial length of the distal flexible tube is greater than the axial length of the proximal flexible tube; The proximal flexible tube is provided with a first elastic coil, one end of the first elastic coil is fixedly connected with the proximal hard tube, and the other end of the first elastic coil is fixedly connected with the middle hard tube; the distal flexible tube is provided with a second elastic coil, one end of the second elastic coil is fixedly connected with the middle hard tube, and the other end of the second elastic coil is fixedly connected with the distal hard tube. In one embodiment, the second motor is disposed within the blood flow path and between the first impeller and the second impeller, with a first fluid gap being spaced between an outer surface of the second motor and an inner wall surface of the flow path tube, and/or, The third motor is arranged in the blood flow channel and is positioned between the first impeller and the third impeller, and a second fluid gap is arranged between the outer surface of the third motor and the inner wall surface of the flow channel tube at intervals. In one embodiment, a mounting bracket is arranged inside the runner pipe, the mounting bracket comprises a plurality of ribs which are arranged at intervals along the circumferential direction of the runner pipe, the ribs are connected with the inner wall surface of the runner pipe and the second motor or the third motor, the ribs extend along the axial direction of the runner pipe, the axial length of the ribs is larger than the radial width of the ribs, and/or the ribs are provided with proximal ends, the thickness of the proximal ends is gradua