CN-119607401-B - Pump blood driving mechanism of blood pump, blood pump and ventricular assist system

Abstract

The present application relates to a blood pump driving mechanism, a blood pump, and a ventricular assist system. The blood pumping driving mechanism comprises a blade assembly and a driving assembly, wherein the blade assembly is provided with a first shape and a second shape, the maximum radial dimension of the blade assembly in the first shape is larger than the maximum radial dimension in the second shape, and the driving assembly can drive the blade assembly to reciprocate and axially stretch so as to enable the blade assembly to be alternately switched between the first shape and the second shape, and further enable the blade assembly to perform blood pumping operation. The blood pumping driving mechanism can effectively reduce the shearing force on blood cells, so that the hemolysis risk is greatly eliminated, the clinical application time and stability of the product are greatly improved, and the effects of low-frequency operation and high blood flow perfusion can be realized.

Inventors

• WANG RUIXIN
• ZHANG XIAOWU
• HE MING

Assignees

• 唯柯启源(无锡)医疗科技有限公司

Dates

Publication Date

20260508

Application Date

20241231

Claims (11)

1. 1. A pump blood driving mechanism of a blood pump, comprising: A blade assembly having a first configuration and a second configuration, the blade assembly having a maximum radial dimension in the first configuration that is greater than a maximum radial dimension in the second configuration; the blade assembly comprises a plurality of blades which are sequentially connected from near to far, in the first state, each blade is unfolded, and in the second state, each blade is folded; The driving assembly can drive the paddle assembly to axially stretch back and forth so as to enable the paddle assembly to be alternately switched between the first mode and the second mode, and further enable the paddle assembly to perform blood pumping operation, the driving assembly comprises an inner tube and an outer tube, the distal end of the outer tube is connected with the proximal-most paddle, the inner tube is provided with a proximal end portion and a distal end portion which are connected, the proximal end portion is movably sleeved in the outer tube, and the distal end portion penetrates through each paddle and is connected with the distal-most paddle.
2. 2. The pump blood drive mechanism of claim 1, wherein a maximum radial dimension of the plurality of paddles in the first configuration decreases in sequence along the direction of pump blood.
3. 3. The pump blood driving mechanism according to claim 1, wherein the paddle comprises a closed section and a hollow section which are connected, the closed section and the hollow section are sequentially arranged along the pump blood direction, and the radial dimension of the joint between the closed section and the hollow section is the largest.
4. 4. A pump blood drive mechanism according to claim 3 wherein the radial dimensions of the closed section in both the first and second configurations are progressively larger in the direction of the pump blood and the radial dimensions of the hollowed-out section in both the first and second configurations are progressively smaller in the direction of the pump blood.
5. 5. The pumping blood driving mechanism according to claim 3, wherein the closed section comprises a first skeleton and a flow blocking film, the flow blocking film is covered on the first skeleton, the first skeleton is connected with the hollowed-out section, and/or, The hollowed-out section comprises a second framework, and the second framework is connected with the closed section.
6. 6. The pump blood driving mechanism according to claim 5, wherein the first frame is made of a shape memory material, and wherein the paddle is in the first configuration when the first frame is in the initial state, and/or, The second framework is made of shape memory materials, and when the second framework is in an initial state, the blade is in the first form.
7. 7. The pump blood drive mechanism of claim 1, wherein the paddle assembly further comprises at least one connecting tube disposed between corresponding adjacent two of the paddles or proximal to a proximal end of the paddle.
8. 8. The pump blood drive mechanism of claim 7, wherein the inner tube is a hypotube.
9. 9. The pump blood drive mechanism of any one of claims 1 to 8, further characterized by at least one of the following features: the blood pumping driving mechanism further comprises a first developing piece, and the first developing piece is arranged on the near side of the paddle assembly; the blood pumping driving mechanism further comprises a second developing piece, wherein the second developing piece is arranged on the far side of the paddle assembly; the pumping blood driving mechanism further comprises a protective coating, and the protective coating is arranged on the surface of the blade assembly.
10. 10. A blood pump comprising a pump housing, a catheter, a power mechanism and a pumping drive mechanism according to any one of claims 1 to 9; The pump shell is provided with a blood flow inlet and a blood flow outlet, the catheter is arranged on the proximal side of the pump shell, the blade assembly of the blood pumping driving mechanism is arranged in the pump shell, the proximal end of the driving assembly of the blood pumping driving mechanism is connected with the power mechanism, and the power mechanism can drive the blade assembly to axially stretch back and forth between the blood flow inlet and the blood flow outlet through the driving assembly.
11. 11. A ventricular assist system comprising a handle mechanism and the blood pump of claim 10, wherein a proximal end of a catheter of the blood pump is connected to the handle mechanism.

Description

Pump blood driving mechanism of blood pump, blood pump and ventricular assist system Technical Field The application relates to the technical field of medical equipment, in particular to a pump blood driving mechanism of a blood pump, the blood pump and a ventricular assist system. Background Interventional catheter pumps, also known as blood pumps, are often used to be implanted from a blood vessel into a patient's ventricle to assist the patient's heart in pumping blood from the ventricle into the artery, enabling support for the patient's blood circulation. The traditional blood pump comprises a pump shell, an impeller, a motor and a guide pipe, wherein the motor is arranged between the pump shell and the guide pipe, the impeller is used as a pump blood driving mechanism and can rotate in the pump shell under the driving of the motor, and blood can flow into the pump shell through a blood flow inlet of the pump shell and flow out from a blood flow outlet of the pump shell. However, the shearing force generated when the impeller rotates at a high speed damages red blood cells, thereby generating potential hemolysis side effects, and the longer the running time is, the greater the side effects are and the higher the complication occurrence is. Disclosure of Invention In view of the above, it is necessary to provide a pump blood driving mechanism for a blood pump, and a ventricular assist system. A pump blood drive mechanism for a blood pump, comprising: A blade assembly having a first configuration and a second configuration, the blade assembly having a maximum radial dimension in the first configuration that is greater than a maximum radial dimension in the second configuration; The driving assembly can drive the blade assembly to stretch back and forth axially, so that the blade assembly can be alternately switched between the first form and the second form, and further the blade assembly can perform blood pumping operation. In one embodiment, the blade assembly comprises a plurality of blades connected in sequence from near to far, each of the blades being deployed in the first configuration and each of the blades being stowed in the second configuration. In one embodiment, the maximum radial dimension of the plurality of paddles in the first configuration decreases in sequence in the direction of pumping blood. In one embodiment, the blade comprises a closed section and a hollow section which are connected, wherein the closed section and the hollow section are sequentially arranged along the blood pumping direction, and the radial dimension of the joint between the closed section and the hollow section is the largest. In one embodiment, the radial dimensions of the closed section in the first and second configurations are gradually increased along the pumping direction, and the radial dimensions of the hollow section in the first and second configurations are gradually decreased along the pumping direction. In one embodiment, the closed section comprises a first framework and a flow blocking film, the flow blocking film is covered on the first framework, the first framework is connected with the hollowed-out section, and/or, The hollowed-out section comprises a second framework, and the second framework is connected with the closed section. In one embodiment, the first skeleton is a shape memory material, and the blade is in the first configuration when the first skeleton is in an initial state, and/or, The second framework is made of shape memory materials, and when the second framework is in an initial state, the blade is in the first form. In one embodiment, the paddle assembly further comprises at least one connecting tube disposed between corresponding adjacent two of the paddles or proximal to the proximal end of the proximal-most paddle. In one embodiment, the driving assembly comprises an inner tube and an outer tube, wherein the distal end of the outer tube is connected with the proximal blade, the inner tube is provided with a proximal end and a distal end which are connected, the proximal end is movably sleeved in the outer tube, and the distal end is penetrated in each blade and connected with the distal blade. In one embodiment, the inner tube is a hypotube. In one embodiment, the pumping mechanism further has at least one of the following features: the blood pumping driving mechanism further comprises a first developing piece, and the first developing piece is arranged on the near side of the paddle assembly; the blood pumping driving mechanism further comprises a second developing piece, wherein the second developing piece is arranged on the far side of the paddle assembly; the pumping blood driving mechanism further comprises a protective coating, and the protective coating is arranged on the surface of the blade assembly. A blood pump comprising a pump housing, a catheter, a power mechanism and a pump blood driving mechanism as claimed in any one of the preceding claims; The pump shell