CN120884812A

CN120884812A - An emergency interventional assisted catheter blood pump and its working method

Info

Publication number: CN120884812A
Application number: CN202511214588.5A
Authority: CN
Inventors: 荆腾; 茹伟民
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2025-08-28
Filing date: 2025-08-28
Publication date: 2025-11-04

Abstract

This invention provides an emergency interventional ventricular assist catheter-based blood pump and its operating method, relating to the field of medical devices. The pump includes a centrifugal pump, a catheter, a pump head, and a controller. The pump head, catheter, and centrifugal pump are sequentially connected. The pump head can be implanted into the heart via interventional surgery. One end of the catheter is connected to the pump head, and the other end extends along the interventional blood vessel to connect with the pump housing of the centrifugal pump. The controller is used to control the operation of the centrifugal pump to provide ventricular assist to the patient. This invention's blood pump allows for rapid implantation of the pump head and catheter via interventional implantation, reducing surgical time and saving patients' lives.

Description

First-aid type interventional assisted catheter blood pump and working method

Technical Field

The invention relates to the field of medical appliances, in particular to an emergency intervention type auxiliary catheter blood pump and a working method thereof.

Background

Acute Heart Failure (AHF) is a clinical syndrome in which Acute Heart Failure (AHF) is caused by acute onset or aggravated left heart dysfunction, such as reduced myocardial contractility and aggravated heart load, resulting in acute heart discharge volume, increased pulmonary circulatory pressure, increased peripheral circulatory resistance, and acute pulmonary congestion, pulmonary edema, and possibly accompanied by tissue, organ hypoperfusion, and cardiogenic shock. Acute heart failure is often life threatening, has high mortality rate, and needs emergency rescue. The rescue modes mainly comprise two modes, namely, a mode of recovering the normal blood pumping function of the natural heart through electric shock and the like, and a mode of maintaining the normal blood circulation of a human body through an extracorporeal circulation system. The heart assist device is an artificial organ, also called artificial heart, which can partially or completely replace the natural heart function and maintain the blood circulation of the human body. Currently, the commercial artificial hearts are mostly blood pumps which are implanted invasively, and the assistance of the blood pumps is basically used as the final treatment means for patients with severe heart failure. However, for the acute heart failure patient with highest death rate, the operation time for invasive implantation of the blood pump is too long, which is easy to cause sudden death of the patient in the artificial heart implantation process. The catheter blood pump is developed under the condition, and can be timely implanted to the aortic valve position of the heart for left heart assistance by a minimally invasive technology, so that the time for transplanting the blood pump is reduced, and the patients with acute heart failure are assisted to pass the dangerous period. For a rotary impeller blood pump, the volume of the axial flow blood pump can be smaller than that of a centrifugal pump, and the minimally invasive implantation condition is met, so that most of the researches on a catheter pump adopt the axial flow blood pump. However, the impeller diameter of the catheter pump is very small due to the limitation of minimally invasive implantation conditions, the rotating speed of the blood pump must be increased in order to meet basic auxiliary requirements, the rotating speed of the currently commercialized catheter pump is generally more than 20000rpm, some are even close to 50000rpm, and the flow is relatively low, generally about 2L/min. In addition, the high-speed rotation of the blood pump inevitably generates high shear stress, damages the conveyed blood, and the blood pump is difficult to meet the hemolysis requirement only by optimizing the impeller of the blood pump. Therefore, on the premise of meeting basic auxiliary requirements, the method for reducing the rotation speed of the blood pump and improving the flow is a difficult problem to be solved urgently by the catheter pump.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides an emergency intervention type auxiliary catheter blood pump and a working method thereof, the blood pump can quickly implant the pump head and the catheter in an interventional implantation mode, so that the operation time is reduced, and the life of a patient is saved.

The present invention achieves the above technical object by the following means.

The first-aid type interventional assisted catheter blood pump comprises a centrifugal pump, a catheter, a pump head and a controller, wherein the pump head, the catheter and the centrifugal pump are sequentially communicated, the pump head can be implanted to a heart position through interventional operation, one end of the catheter is communicated with the pump head, the other end of the catheter extends to the outside of the body along an interventional blood vessel and is connected with a pump shell of the centrifugal pump, and the controller is used for controlling the centrifugal pump to work and assist a heart chamber of a patient.

In the scheme, the centrifugal pump comprises a stator, a rotor, an impeller and a pump shell, wherein the rotor is fixedly connected with the impeller, the outer diameter of the rotor is matched with the inner diameter of the stator, the impeller is arranged in the pump shell, the pump shell comprises a pump shell inner cavity and a pump shell outer cavity, the pump shell outer cavity is arranged outside the pump shell inner cavity, and the pump shell inner cavity is communicated with the pump shell outer cavity through a through hole formed in the pump shell inner cavity.

In the scheme, the controller controls the stator to generate an alternating magnetic field to drive the rotor and the impeller to rotate at a constant speed or a variable speed.

The pump head comprises a pump head inlet, a pump head outlet, an inlet pipe and an outlet pipe, wherein the top end of the inlet pipe is thicker, a plurality of through grooves serving as the pump head inlet are formed in the axial direction, the through grooves are smoothly transited into thinner pipelines along the axial direction, the diameter of the outlet pipe is consistent with that of the inlet pipe, the outlet pipe is sleeved outside the thinner pipelines of the inlet pipe and is fixed at the thickness juncture of the inlet pipe, the end part of the outlet pipe is provided with the pump head outlet, a plurality of through holes are formed in the pump head outlet, and the through holes are evenly distributed on the circumference of the joint of the outlet pipe and the inlet pipe.

In the above scheme, the catheter comprises a catheter inner tube and a catheter outer tube, and the catheter outer tube is sleeved outside the catheter inner tube, wherein the area included in the catheter inner tube is a catheter inner cavity, and the area between the catheter outer tube and the catheter inner tube is a catheter outer cavity.

In the scheme, the thinner end of the inlet pipe is communicated with the inner cavity of the pump shell through the inner cavity of the guide pipe, and the outlet pipe is communicated with the outer cavity of the pump shell through the outer cavity of the guide pipe.

In the scheme, the inlet pipe is lengthened and folded when being implanted, is shortened and unfolded into a lantern shape after being implanted, and a gap between the cage hubs is a pump head inlet.

In the scheme, the end of the pump head entering the heart is of an elliptic or semicircular structure, and the top end of the pump head is provided with a guide hole which is convenient to implant.

In the above aspect, the catheter is made of a flexible material.

The working method of the first-aid interventional assisted catheter blood pump comprises the following steps of left heart assist or/and right heart assist;

Step one, implanting a guide wire at the femoral artery position through an intervention operation along an arterial vessel and through an aortic valve to the left ventricle;

Folding the pump head and connecting the pump head and the guide pipe together;

step three, a guide hole passes through the outer end of the guide wire, a pump head inlet is implanted into the left ventricle along the guide wire, and a pump head outlet is positioned in the aorta and is placed across the aortic valve;

step four, the guide wire is drawn out, and the other end of the guide wire is positioned outside the body and connected with the pump shell;

Under the action of the centrifugal pump, blood enters the pump head inlet from the left ventricle, enters the pump shell inner cavity along the catheter inner cavity, enters the pump shell outer cavity under the action of the centrifugal force of the impeller, reaches the pump head outlet along the catheter outer cavity, enters the aorta and completes left heart assistance;

likewise, the pump head is implanted in the right ventricle for right heart assist.

The first-aid type interventional assisted catheter blood pump is a first-aid type short-term assisted blood pump, can be implanted rapidly through a minimally invasive technology, and is mainly used for rescuing patients suffering from acute heart failure. The blood pump can be used for quickly implanting the pump head and the catheter in an interventional implantation mode, so that the operation time is reduced, and the life of a patient is saved.

Drawings

FIG. 1 is a block diagram of an emergency type rapid intervention type auxiliary catheter blood pump;

FIG. 2 is a folded view of the pump head of the emergency-type rapid-intervention auxiliary catheter blood pump;

FIG. 3 is an expanded view of a pump head of the emergency-type rapid intervention type auxiliary catheter blood pump;

FIG. 4 is a plan view of a centrifugal pump of the emergency-type rapid-intervention auxiliary catheter blood pump;

FIG. 5 is a plan view of the pump housing of the emergency type rapid intervention type auxiliary catheter blood pump;

Fig. 6 is a planed and partial view of a catheter of an emergency-type rapid-intervention auxiliary catheter blood pump.

Reference numerals:

1-centrifugal pump, 1.1-stator, 1.2-rotor, 1.3-impeller, 1.4-pump shell, 1.4.1-pump shell inner cavity, 1.4.2-pump shell outer cavity, 1.4.3-through hole, 2-conduit, 2.1-conduit outer cavity, 2.2-conduit inner cavity, 3-pump head, 3.1-pump head inlet, 3.2-pump head outlet, 3.3-inlet pipe, 3.4-outlet pipe, 3.5-guide hole and 4-controller.

Detailed Description

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, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in 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.

The first-aid type interventional assisted catheter blood pump comprises a centrifugal pump 1, a catheter 2, a pump head 3 and a controller 4, wherein the pump head 3, the catheter 2 and the centrifugal pump 1 are sequentially communicated, the pump head 3 can be implanted to a heart position through interventional operation, one end of the catheter 2 is communicated with the pump head 3, the other end of the catheter extends to the outside of the body along an interventional blood vessel and is connected with a pump shell 1.4 of the centrifugal pump 1, and the controller 4 is used for controlling the operation of the centrifugal pump 1 and assisting a heart chamber of a patient.

In the scheme, the centrifugal pump 1 comprises a stator 1.1, a rotor 1.2, an impeller 1.3 and a pump shell 1.4, wherein the rotor 1.2 is fixedly connected with the impeller 1.3, the outer diameter of the rotor 1.2 is matched with the inner diameter of the stator 1.1, the impeller 1.3 is arranged in the pump shell 1.4, the pump shell 1.4 comprises a pump shell inner cavity 1.4.1 and a pump shell outer cavity 1.4.2, the pump shell outer cavity 1.4.2 is arranged outside the pump shell inner cavity 1.4.1, and the pump shell inner cavity 1.4.1 and the pump shell outer cavity 1.4.2 are communicated through a through hole 1.4.3 formed in the pump shell inner cavity 1.4.1.

In the above scheme, the controller 4 controls the stator 1.1 to generate an alternating magnetic field to drive the rotor 1.2 and the impeller 1.3 to rotate at a constant speed or a variable speed.

In the scheme, the pump head 3 comprises a pump head inlet 3.1, a pump head outlet 3.2, an inlet pipe 3.3 and an outlet pipe 3.4, wherein the top end of the inlet pipe 3.3 is thicker, a plurality of through grooves serving as the pump head inlet 3.1 are formed in the axial direction, the through grooves are smoothly transited into thinner pipelines along the axial direction, the diameter of the outlet pipe 3.4 is consistent with that of the inlet pipe 3.3, the outlet pipe 3.4 is sleeved outside the thinner pipelines of the inlet pipe 3.3 and is fixed at the thick-thin junction position of the inlet pipe 3.3, the end part of the outlet pipe 3.4 is provided with the pump head outlet 3.2, a plurality of through holes are formed in the pump head outlet 3.2, and the through holes are evenly distributed on the circumference of the joint of the outlet pipe 3.4 and the inlet pipe 3.3.

In the above-mentioned scheme, the pipe 2 includes pipe inner tube and pipe outer tube, and pipe outer tube suit is in the pipe inner tube outside, and wherein, the pipe inner tube includes the region and is pipe inner chamber 2.2, and the region between pipe outer tube and the pipe inner tube is pipe outer chamber 2.1.

In the above scheme, the thinner end of the inlet pipe 3.3 is communicated with the pump shell inner cavity 1.4.1 through the catheter inner cavity 2.2, and the outlet pipe 3.4 is communicated with the pump shell outer cavity 1.4.2 through the catheter outer cavity 2.1.

In the above scheme, the inlet pipe 3.3 is lengthened and folded when being implanted, and is shortened and unfolded into a lantern shape after being implanted, and the gap between the cage hubs is the pump head inlet 3.1.

In the above proposal, the end of the pump head 3 at the heart entering position is in an elliptic or semicircular structure, and the top end is provided with a guide hole 3.5 which is convenient for implantation.

In the above-described solution, the catheter 2 is made of a flexible material.

Folding the pump head 3 and connecting the pump head and the guide pipe 2 together;

step three, a guide hole 3.5 passes through the outer end of the guide wire, a pump head inlet 3.1 is implanted into the left ventricle along the guide wire, and a pump head outlet is positioned in the aorta and is placed across the aortic valve;

step four, the guide wire is drawn out, and the other end of the guide tube 2 is positioned outside the body and connected with the pump shell 1.4;

Under the action of the centrifugal pump 1, blood enters the pump head inlet 3.1 from the left ventricle, enters the pump shell inner cavity 1.4.1 along the catheter inner cavity 2.2, enters the pump shell outer cavity 1.4.2 under the action of the centrifugal force of the impeller 1.3, reaches the pump head outlet 3.2 along the catheter outer cavity 2.1, enters the aorta, and completes left heart assistance;

The structure is shown in figure 1, the first-aid type interventional auxiliary catheter blood pump comprises a centrifugal pump 1, a controller 4, a catheter 2 and a pump head 3, wherein the centrifugal pump comprises a stator 1.1, a rotor 1.2, an impeller 1.3 and a pump shell 1.4, the impeller 1.3 is fixedly connected with the rotor 1.2, and the operation is controlled by a magnetic field generated by the stator. The catheter 2 is made of flexible material and can be bent to a certain extent, one end of the catheter is connected with the top end of the pump shell of the centrifugal blood pump, and the other end of the catheter is connected with the pump head 3. The pump head 3 is provided with an inlet and an outlet of the blood pump. The centrifugal blood pump shell 1.4 and the catheter 2 are both composed of an inner layer and an outer layer which are coaxial, wherein the inner layer is communicated with the inlet of the pump head, and the outer layer is communicated with the outlet of the pump head. The inner layer and the outer layer of the centrifugal blood pump shell are communicated through the through holes, blood enters the inner layer of the centrifugal blood pump shell from the inlet of the pump head through the inner layer of the catheter, is transferred to the outer layer through the centrifugal force of the inner impeller, flows to the outlet of the pump head through the outer layer of the catheter, and achieves the blood pumping function. The pump head 3 is provided with an inlet and an outlet, and the inlet part can be unfolded after implantation to prevent suction. The controller 4 controls the centrifugal blood pump to run at a constant speed or at a variable speed. The blood pump can implant the pump head 3 from the aorta or vein into the left ventricle or the right ventricle through interventional operation, the inlet is positioned in the left ventricle or the right ventricle, the outlet is positioned in the aorta or the pulmonary artery, and left heart assistance, right heart assistance or double heart assistance is performed.

The first-aid type interventional auxiliary catheter blood pump comprises a centrifugal pump 1, a catheter 2, a pump head 3 and a controller 4, wherein the centrifugal pump 1 comprises a stator 1.1, a rotor 1.2, an impeller 1.3 and a pump shell 1.4, the rotor 1.2 is fixedly connected with the impeller 1.3, the pump shell 1.4 consists of an inner cavity 1.4.1 and an outer cavity 1.4.2, the inner cavity and the outer cavity are communicated through a through hole 1.4.3 between the inner cavity and the outer cavity, the centrifugal pump 1 controls constant rotation speed or variable rotation speed through the controller 4, the pump head 3 can be folded during interventional implantation and is unfolded after the implantation, the pump head 3 is provided with a pump head inlet 3.1 and a pump head outlet 3.2, the catheter 2 is made of flexible materials, during the interventional implantation can be bent according to the shape of a blood vessel, one end of the catheter is connected with the pump shell 1.4, the other end of the catheter is connected with the pump head 3, the catheter consists of two layers of a catheter inner cavity 2.2 and a catheter outer cavity 2.1, the catheter inner cavity 2.1 is respectively communicated with the pump head inlet 3.1 and the centrifugal pump cavity 1.4.1, the catheter outer cavity 2.1 is respectively communicated with the pump shell outlet 3.1.

Embodiment one left heart assist

Firstly, a guide wire is always implanted into a left ventricle through an aortic valve along an arterial vessel by interventional operation at a femoral artery position, secondly, a pump head 3 is folded and connected with a guide tube 2, thirdly, a guide hole 3.5 passes through the outer end of the guide wire, a pump head inlet 3.1 is implanted into the left ventricle along the guide wire, a pump head outlet is positioned in an aorta and is placed across the aortic valve, fourth, the guide wire is drawn out, the other end of the guide tube 2 is positioned outside the body and is connected with a pump shell 1.4, and fifth, an inlet tube 3.3 is unfolded, a power wire of the centrifugal pump 1 is connected with a controller 4, the operation of the centrifugal pump 1 is controlled by the controller 4, left heart assistance is realized, blood enters the pump head inlet 3.1 from the left ventricle, enters the pump shell inner cavity 1.4.1 along the guide tube inner cavity 2, enters the pump shell outer cavity 1.4.2 under the action of centrifugal force of an impeller 1.3, and reaches the pump head outlet 3.2 along the guide tube outer cavity 2.1, and enters the left heart assistance is completed.

Embodiment two right heart assist

Firstly, a guide wire is implanted to the right ventricle along an arterial vessel through a pulmonary valve at a femoral vein position through interventional operation, secondly, a pump head 3 is folded and connected with a guide tube 2, thirdly, a guide hole 3.5 passes through the outer end of the guide wire, a pump head inlet (3.1) is implanted to the right ventricle along the guide wire, a pump head outlet is positioned at a pulmonary artery and is placed across the pulmonary valve, fourth, the guide wire is drawn out, the other end of the guide tube 2 is positioned outside the body and is connected with a pump shell 1.4, fifth, an inlet tube 3.3 is unfolded, a power wire of the centrifugal pump 1 is connected with a controller 4, the operation of the centrifugal pump 1 is controlled through the controller 4, right heart assistance is realized, blood enters the pump head inlet 3.1 from the right ventricle, enters the pump shell inner cavity 1.4.1 along the guide tube inner cavity 2.2, enters the outer cavity 1.4.2 along the guide tube outer cavity 2.1 and enters the pulmonary artery under the action of centrifugal force of an impeller 1.3, and the right heart assistance is completed.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. An emergency interventional assisted catheter blood pump, characterized in that it comprises a centrifugal pump (1), a catheter (2), a pump head (3), and a controller (4); the pump head (3), the catheter (2), and the centrifugal pump (1) are connected in sequence, the pump head (3) can be implanted into the heart through interventional surgery, one end of the catheter (2) is connected to the pump head (3), and the other end extends along the interventional blood vessel to the outside and is connected to the pump housing (1.4) of the centrifugal pump (1); the controller (4) is used to control the operation of the centrifugal pump (1) to provide ventricular assistance to the patient.

2. The emergency interventional assisted catheter blood pump according to claim 1, characterized in that the centrifugal pump (1) includes a stator (1.1), a rotor (1.2), an impeller (1.3), and a pump casing (1.4); the rotor (1.2) and the impeller (1.3) are fixedly connected, the outer diameter of the rotor (1.2) matches the inner diameter of the stator (1.1), the impeller (1.3) is placed inside the pump casing (1.4), and the pump casing (1.4) includes an inner cavity (1.4.1) and an outer cavity (1.4.2); the outer cavity (1.4.2) is provided outside the inner cavity (1.4.1), and the inner cavity (1.4.1) and the outer cavity (1.4.2) are connected through a through hole (1.4.3) opened on the inner cavity (1.4.1).

3. The emergency interventional assisted catheter blood pump according to claim 2, characterized in that the controller (4) controls the stator (1.1) to generate an alternating magnetic field, driving the rotor (1.2) and impeller (1.3) to operate at a constant speed or a variable speed.

4. The emergency interventional assisted catheter blood pump according to claim 1, characterized in that the pump head (3) includes a pump head inlet (3.1), a pump head outlet (3.2), an inlet pipe (3.3), and an outlet pipe (3.4); the top end of the inlet pipe (3.3) is thicker, and several through grooves are provided along the axial direction as pump head inlets (3.1), and after the through grooves, it smoothly transitions into a thinner pipe along the axial direction; the diameter of the outlet pipe (3.4) is the same as the diameter of the thicker part of the inlet pipe (3.3), and the outlet pipe (3.4) is sleeved on the outside of the thinner part of the inlet pipe (3.3) and fixed at the junction of the thicker and thinner parts of the inlet pipe (3.3); the end of the outlet pipe (3.4) is provided with a pump head outlet (3.2), and multiple through holes are opened on the pump head outlet (3.2), and the multiple through holes are evenly distributed on the circumference of the connection between the outlet pipe (3.4) and the inlet pipe (3.3).

5. The emergency interventional catheter blood pump according to claim 1, characterized in that the catheter (2) includes an inner catheter tube and an outer catheter tube, the outer catheter tube being fitted over the outer side of the inner catheter tube, wherein the area included by the inner catheter tube is the inner lumen (2.2), and the area between the outer catheter tube and the inner catheter tube is the outer lumen (2.1).

6. The emergency interventional assisted catheter blood pump according to claim 4, characterized in that the thinner end of the inlet tube (3.3) is connected to the inner cavity of the pump housing (1.4.1) through the inner lumen of the catheter (2.2), and the outlet tube (3.4) is connected to the outer cavity of the pump housing (1.4.2) through the outer lumen of the catheter (2.1).

7. The emergency interventional assisted catheter blood pump according to claim 4, characterized in that the inlet tube (3.3) is elongated and folded during implantation, and shortened and opened into a lantern shape after implantation, and the gap between the cage hubs is the pump head inlet (3.1).

8. The emergency interventional assisted catheter blood pump according to claim 1, characterized in that the pump head (3) has an elliptical or semi-circular structure at the end where it enters the heart, and a guide hole (3.5) is provided at the top for easy implantation.

9. The emergency interventional assisted catheter blood pump according to claim 1, characterized in that the catheter (2) is made of a flexible material.

10. The method of operating the catheter-based blood pump for emergency interventional assistance according to any one of claims 1 to 9, characterized in that it includes the following steps: including left ventricular assist and/or right ventricular assist;

Step 1: The guidewire is inserted into the left ventricle via an interventional procedure, following the artery through the aortic valve at the femoral artery location.

Step 2: Fold the pump head (3) and connect it to the conduit (2);

Step 3: The guide hole (3.5) passes through the external end of the guidewire, and the pump head inlet (3.1) is implanted into the left ventricle along the guidewire. The pump head outlet is located in the aorta and is placed across the aortic valve.

Step 4: Pull out the guidewire. The other end of the catheter (2) is connected to the pump housing (1.4) outside the body.

Step 5: Unfold the inlet tube (3.3) and connect the power cord of the centrifugal pump (1) to the controller (4). Control the operation of the centrifugal pump (1) through the controller (4) to achieve left ventricular assist. Under the action of the centrifugal pump (1), blood enters the pump head inlet (3.1) from the left ventricle, enters the pump housing cavity (1.4.1) along the inner lumen of the catheter (2.2), and under the action of the centrifugal force of the impeller (1.3), the blood enters the outer cavity of the pump housing (1.4.2), reaches the pump head outlet (3.2) along the outer lumen of the catheter (2.1), and enters the aorta to complete left ventricular assist. Similarly, implant the pump head into the right ventricle to perform right ventricular assist.