CN117899350A - Double-core auxiliary centrifugal blood pump - Google Patents

Abstract

The invention discloses a double-core auxiliary centrifugal blood pump, which comprises a pump shell component, a rotor component, a supporting mechanism and a driving mechanism, wherein the pump shell component is provided with a pump shell main body, a baffle plate which is arranged on the pump shell main body and divides the pump shell main body into two pump cavities, and two groups of pipe components which are respectively communicated with the two pump cavities; the rotor assembly is provided with a rotor penetrating through the two pump cavities and an inlet pipe and two impellers sleeved outside the rotor, and the two impellers are respectively arranged in the two pump cavities; the support mechanism is provided with two groups of radial support mechanisms arranged on the rotor at intervals and an axial support mechanism arranged between the two impellers, and the radial support mechanisms and the axial support mechanisms cooperate to keep the rotor assembly in a stable suspension state; the driving mechanism can drive the rotor assembly to rotate, so that the two impellers respectively drive blood circulation in the two pump cavities to flow. The blood pump has the double-heart auxiliary function, has the advantages of simple and reasonable structure, small volume, light weight and stable operation, reduces the implantation invasiveness and the manufacturing cost of the blood pump, and meets the clinical requirements.

Description

Double-core auxiliary centrifugal blood pump

Technical Field

The invention relates to the technical field of medical appliances, in particular to a double-heart auxiliary centrifugal blood pump.

Background

For patients with advanced heart failure, no effective treatment method exists in the internal medicine at present, and only two surgical treatment methods of heart transplantation and artificial heart are very effective. However, since heart transplantation is a symbolized treatment technique due to the serious inadequacy of the donor, artificial hearts are expected.

Artificial hearts are simply referred to as "blood pumps," which can be categorized by function as: total artificial hearts and assisted artificial hearts (i.e. "heart assist devices"). In recent years, heart assist devices represented by blood pumps with centrifugal or axial flow blades have become the mainstream of development of blood pumps, such as: heartMate 2 and 3, HEARTMATE, JARVIK, 2000 and 2015 in the United states have been clinically used for tens of thousands of cases. However, these devices belong to left ventricle auxiliary devices, and no auxiliary blood pump products with double cardiac functions like a full artificial heart are marketed at present, and although there are special cases of using two blood pumps to assist left and right ventricles in news reports abroad, the device needs to install two sets of blood pumps, the implanted volume of a human body is large, the invasiveness is strong, and an in-vitro controller and a battery need to be provided with two sets of systems, which can cause poor living quality of patients. Therefore, there is a need for a small-sized independent blood pump with a dual-heart assist function.

In view of this, the present invention has been made.

Disclosure of Invention

In order to overcome the defects, the invention provides the double-heart auxiliary centrifugal blood pump which has the double-heart auxiliary function, is novel, reasonable and concise in structure, small in size, light in weight and stable in operation, reduces the implantation invasiveness of the blood pump, reduces the manufacturing cost of the blood pump, and well meets clinical requirements.

The technical scheme adopted by the invention for solving the technical problems is as follows: a dual-heart assisted centrifugal blood pump comprising:

The pump shell assembly is provided with a pump shell main body, a partition plate which is arranged on the pump shell main body and divides the pump shell main body into two pump cavities, and two groups of pipe assemblies which are respectively communicated with the two pump cavities correspondingly; each group of the pipe assemblies is provided with an inlet pipe capable of communicating the pump cavity with the human ventricle and an outlet pipe capable of communicating the pump cavity with the human aorta or the human pulmonary aorta;

The rotor assembly is provided with a rotor penetrating through the two pump cavities and one inlet pipe in sequence and two impellers which are axially spaced along the rotor and fixedly sleeved outside the rotor; the two impellers are respectively arranged in the two pump cavities;

The support mechanism is provided with two groups of radial support mechanisms which are arranged on the rotor at intervals along the axial direction of the rotor and can provide radial suspension support for the rotor, and an axial support mechanism which is arranged between the two impellers and can provide axial suspension support for the impellers, and the two groups of radial support mechanisms and the axial support mechanisms cooperate to ensure that the rotor assembly is in a stable suspension state as a whole;

The driving mechanism is connected with the rotor and can drive the rotor assembly to integrally rotate, so that two impellers respectively drive blood in the two pump cavities to circularly flow.

As a further development of the invention, two of said pump chambers are defined as a first pump chamber and a second pump chamber, respectively;

correspondingly, the inlet pipe and the outlet pipe which are communicated with the first pump cavity are respectively defined as a first inlet pipe and a first outlet pipe, the first inlet pipe can be communicated with the first pump cavity and the left ventricle of the human body, and the first outlet pipe can be communicated with the first pump cavity and the aorta of the human body;

The inlet pipe and the outlet pipe which are communicated with the second pump cavity are respectively defined as a second inlet pipe and a second outlet pipe, the second inlet pipe can be communicated with the second pump cavity and the right ventricle of the human body, and the second outlet pipe can be communicated with the second pump cavity and the pulmonary aorta of the human body.

As a further improvement of the invention, the rotor is of a hollow cylinder structure and sequentially penetrates through the first inlet pipe, the first pump cavity and the second pump cavity; correspondingly, the first inlet pipe is in a straight pipe shape and is arranged coaxially with the rotor; and the two impellers are parallel to each other and are also arranged coaxially with the rotor respectively.

As a further improvement of the invention, two groups of radial supporting mechanisms are respectively defined as a radial supporting mechanism A and a radial supporting mechanism B, wherein the radial supporting mechanism A is arranged between the partition plate and the rotor, and the radial supporting mechanism B is arranged at one shaft end of the rotor penetrating through the first inlet pipe;

The axial supporting mechanism is arranged on two opposite sides of the impellers and on the partition plate.

As a further improvement of the invention, the partition plate is provided with a mounting hole for the rotor to pass through and be arranged with the rotor in a concentric line; the radial supporting mechanism A is provided with an inner magnetic ring fixedly arranged on the rotor and an outer magnetic ring sleeved outside the inner magnetic ring and the rotor and positioned in the mounting hole at the same time, and the same-name magnetic poles of the inner magnetic ring and the outer magnetic ring are arranged oppositely.

As a further improvement of the invention, the inner magnetic ring and the outer magnetic ring are both magnetized in radial direction;

A circle of ring groove A is concavely arranged at the position of the rotor penetrating through the mounting hole, and the inner magnetic ring is fixedly arranged in the ring groove A and is coaxially arranged with the rotor;

the mounting hole is provided with a through hole part which is centered and used for the rotor to pass through and a mounting groove ring which is surrounded on the through hole part and communicated with the through hole part, and the outer magnetic ring is positioned and embedded in the mounting groove ring;

In addition, the supporting mechanism is also provided with a sliding bearing which can provide radial support for the rotor, and an inner ring body of the sliding bearing is fixedly embedded in the annular groove A and is simultaneously abutted against the outer wall of the inner magnetic ring; the outer ring body of the sliding bearing is positioned and embedded in the mounting groove ring and is simultaneously abutted against the inner wall of the outer magnetic ring.

As a further improvement of the invention, the radial supporting mechanism B is provided with a plurality of groups of outer magnetic pieces which are symmetrically arranged outside the first inlet pipe in a surrounding way by taking the central axis of the rotor as a center, and inner magnetic columns which are arranged in a space surrounded by the plurality of outer magnetic pieces and are positioned in one axial end of the rotor at the same time, each group of outer magnetic pieces is provided with a permanent magnet iron core and an electromagnet which is wrapped outside the permanent magnet iron core, and the permanent magnet iron cores and the homonymous magnetic poles of the inner magnetic pieces are oppositely arranged to form radial repulsive magnetic force, so that the rotor is suspended relative to the outer magnetic pieces; the electromagnet can provide electromagnetic force for adjusting the suspension pose of the inner magnetic column and the rotor.

As a further improvement of the invention, the axial supporting mechanism is provided with three magnetic ring bodies which are respectively positioned and arranged on two opposite sides of the two impellers and the partition board, and the three magnetic ring bodies are mutually parallel and are arranged coaxially with the rotor;

In addition, the three magnetic ring bodies are axially magnetized, and homonymous magnetic poles of every two adjacent magnetic ring bodies are oppositely arranged.

As a further improvement of the invention, the baffle plate is also provided with a ring groove B which is arranged outside the mounting hole in a surrounding way and is arranged with the mounting hole in the same center line; the magnetic ring body is positioned and embedded in the annular groove B;

In addition, the inner diameter and the outer diameter of the three magnetic ring bodies are equal, and the axial thickness of the two magnetic ring bodies positioned on the two impellers is equal.

As a further improvement of the invention, the driving mechanism comprises a casing fixedly sleeved outside the first inlet pipe, a stator winding positioned between the casing and the first inlet pipe, and rotor magnetic steel which is arranged in a space surrounded by the stator winding and is positioned in the rotor at the same time;

In addition, a plurality of groups of outer magnetic pieces are also positioned and arranged between the shell and the first inlet pipe, and are arranged with the stator winding along the axial direction of the rotor at intervals; correspondingly, the inner magnetic columns and the rotor magnetic steel are also arranged at intervals along the axial direction of the rotor.

The beneficial effects of the invention are as follows: compared with the prior art, the ① blood pump provided with two pump cavities and driven by one set of rotor component to generate circulating flow, thereby well realizing the double-core auxiliary function and avoiding the defects caused by the implantation of the two blood pumps. ② The blood pump also provides two groups of radial supporting mechanisms and one group of axial supporting mechanisms, and can realize the five-degree-of-freedom suspension supporting function on the rotor assembly, so that the rotor assembly is ensured to be in a stable suspension state, and the stability of the rotor assembly in a high-speed rotation state is improved. ③ The blood pump has novel, reasonable and concise structure, small volume and light weight, and can reduce the implantation invasiveness of the blood pump and reduce the manufacturing cost of the blood pump.

Drawings

FIG. 1 is a schematic cross-sectional view of a dual-core assisted centrifugal blood pump according to the present invention;

FIG. 2 is a schematic view of a partial enlarged structure of the dual-core auxiliary centrifugal blood pump shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a pump housing assembly in a dual-core assisted centrifugal blood pump according to the present invention;

FIG. 4 is a schematic view of a rotor assembly in a dual-core assisted centrifugal blood pump according to the present invention;

FIG. 5 is a schematic view of a radial support mechanism B in a dual-core assisted centrifugal blood pump according to the present invention;

FIG. 6 is a schematic diagram of the permanent magnetic force of the radial support mechanism B according to the present invention;

fig. 7 is a schematic diagram of electromagnetic active regulation of the radial support mechanism B according to the present invention when the inner magnetic column is offset.

The following description is made with reference to the accompanying drawings:

1.A pump housing assembly; 10. a pump housing main body; 10a, a first pump chamber; 10b, a second pump chamber; 11. a partition plate; 110. a mounting hole; 1100. a through hole portion; 1101. a mounting groove ring; 111. a ring groove B;12a, a first inlet pipe; 12b, a second inlet pipe; 13a, a first outlet pipe; 13b, a second outlet tube; 2. a rotor assembly; 20. a rotor; 200. a ring groove A; 21.a main impeller; 210. a main upper cover; 211. a main lower cover; 212. a main blade; 22. an auxiliary impeller; 220. an auxiliary upper cover; 221.a sub lower cover; 222. auxiliary blades; 30. a radial supporting mechanism A; 300. an inner magnetic ring; 301. an outer magnetic ring; 31. a radial supporting mechanism B; 310. an outer magnetic member; 3100a, upper permanent magnet core; 3100b, lower permanent magnet core; 3101a, upper electromagnet; 3101b, a lower electromagnet; 311. an inner magnetic column; 3102. a magnetic bridge; 312. a displacement sensor; 32. an axial support mechanism; 320. a magnetic ring body; 33. a sliding bearing; 330. an inner ring body; 331. an outer ring body; 4. a driving mechanism; 40. a housing; 41. a stator winding; 42. rotor magnetic steel.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1:

Referring to fig. 1 to 7, embodiment 1 provides a dual-core auxiliary centrifugal blood pump, which mainly includes a pump housing assembly 1, a rotor assembly 2, a supporting mechanism and a driving mechanism 4, wherein the pump housing assembly 1 is provided with a pump housing main body 10, a partition plate 11 arranged on the pump housing main body 10 and dividing the pump housing main body 10 into two pump cavities, and two sets of pipe assemblies respectively corresponding to the two pump cavities, each set of pipe assemblies is provided with an inlet pipe capable of communicating the pump cavity with a human ventricle and an outlet pipe capable of communicating the pump cavity with a human aorta or a human pulmonary aorta; the rotor assembly 2 is provided with a rotor 20 and two impellers, wherein the rotor 20 and the impellers are sequentially arranged in the two pump cavities and the inlet pipe in a penetrating way, the impellers are axially spaced along the rotor 20 and fixedly sleeved outside the rotor 20, and the two impellers are respectively arranged in the two pump cavities; the support mechanism is provided with two groups of radial support mechanisms which are arranged on the rotor 20 at intervals along the axial direction of the rotor 20 and can provide radial suspension support for the rotor 20, and an axial support mechanism 32 which is arranged between the two impellers and can provide axial suspension support for the impellers, and the two groups of radial support mechanisms and the axial support mechanism 32 cooperate to ensure that the rotor assembly 2 is in a stable suspension state as a whole; the driving mechanism 4 is connected with the rotor 20 and can drive the rotor assembly 2 to rotate integrally, so that two impellers respectively drive blood in two pump cavities to generate circulating flow, and a double-core auxiliary function is realized.

For the sake of brevity and clarity, the structure and working method of the double-core auxiliary centrifugal blood pump of the present invention are defined as follows:

With continued reference to fig. 3, two pump chambers are respectively defined as a first pump chamber 10a and a second pump chamber 10b, and correspondingly, the inlet pipe and the outlet pipe which are communicated with the first pump chamber 10a are respectively defined as a first inlet pipe 12a and a first outlet pipe 13a, wherein the first inlet pipe 12a can be used for communicating the first pump chamber 10a with the left ventricle of the human body, and the first outlet pipe 13a can be used for communicating the first pump chamber 10a with the aorta of the human body, that is, it can be understood that blood circulating in the first pump chamber 10a is arterial blood, and the first pump chamber 10a, the first inlet pipe 12a, the first outlet pipe 13a, the impellers (which can be defined as a main impeller 21, described in detail below) built in the first pump chamber 10a and the like together form a left heart auxiliary device;

And, the inlet pipe and the outlet pipe communicating with the second pump chamber 10b are respectively defined as a second inlet pipe 12b and a second outlet pipe 13b, and the second inlet pipe 12b is capable of communicating the second pump chamber 10b with the right ventricle of the human body, and the second outlet pipe 13b is capable of communicating the second pump chamber 10b with the pulmonary aorta of the human body, that is, it can be understood that the blood circulating in the second pump chamber 10b is venous blood, and the second pump chamber 10b, the second inlet pipe 12b, the second outlet pipe 13b, the impellers (which may be defined as the secondary impellers 22, described in detail below) built in the second pump chamber 10b, and the like together constitute a right heart assist device.

In combination with the above description and definition of the structure of the dual-core auxiliary centrifugal blood pump, the working mode of the dual-core auxiliary centrifugal blood pump is as follows:

s1: the operator communicates the first inlet tube 12a with the left ventricle of the human body, the first outlet tube 13a with the aorta of the human body, the second inlet tube 12b with the right ventricle of the human body, and the second outlet tube 13b with the pulmonary aorta of the human body;

Description: the connection relationship between the first inlet tube 12a, the first outlet tube 13a, the second inlet tube 12b and the second outlet tube 13b and the heart chamber or the aorta of the human body respectively can be a direct connection relationship or an indirect connection relationship (namely, the double-heart auxiliary centrifugal blood pump is also provided with other infusion tubes for auxiliary connection), which is determined according to the requirement;

S2: the controller controls the driving mechanism 4 to work so as to drive the rotor assembly 2 to rotate integrally; at that time, the two impellers (i.e. the main impeller 21 and the auxiliary impeller 22) simultaneously rotate to do work, so as to correspondingly realize:

Arterial blood of the left ventricle of the human body is drawn out and enters the first pump chamber 10a through the first inlet tube 12 a; then, after the main impeller 21 is pressurized by centrifugal movement, arterial blood is pushed out from the first outlet pipe 13a and enters the aorta of the human body through the connected artificial blood vessel to form left heart assistance, and the body circulation with normal blood pressure and blood flow is maintained;

Venous blood of the right ventricle is drawn out and enters the second pumping chamber 10b through the second inlet tube 12 b; then, after being pressurized by the centrifugal motion of the auxiliary impeller 22, venous blood is pushed out from the second outlet tube 13b, and then enters the pulmonary aorta of the human body through the connected artificial blood vessel, so as to form right heart assist, and maintain the pulmonary circulation with normal blood pressure and blood flow.

From the above, the blood pump of the invention provides two pump cavities, and the blood in the two pump cavities is driven to flow directionally by one set of rotor components, so that the double-heart auxiliary function is well realized, and the defects caused by the implantation of the two blood pumps in the prior art are avoided. In addition, the blood pump also provides two groups of radial supporting mechanisms and one group of axial supporting mechanisms, so that the five-degree-of-freedom suspension supporting function of the rotor assembly can be realized, the rotor assembly is ensured to be in a stable suspension state, and the stability of the rotor assembly in a high-speed rotation state is improved.

The specific structure of the double-heart-assist centrifugal blood pump according to the present invention will be described in detail below.

First, the pump housing assembly 1 is concerned.

As is apparent from the above description, in the structure of the dual-core auxiliary centrifugal blood pump provided in the present embodiment, the pump housing assembly 1 is used as a base of the blood pump, and mainly provides: ① Two pump chamber structures (i.e., a first pump chamber 10a and a second pump chamber 10 b) for respectively corresponding to two ventricles of a human body; it will also be appreciated that the pump housing assembly 1 provides a "double-heart construction"; ② And the tube assembly is used for communicating the two pump cavities with the human ventricle and the human aorta and/or the human pulmonary aorta. ③ The partition plate is used for forming two pump chambers and receiving a rotor 20, a radial support mechanism a30, an axial support mechanism 32, a slide bearing 33, and the like, which will be described below.

Next, with respect to the rotor assembly 2.

In the dual-core auxiliary centrifugal blood pump structure provided in this embodiment, the rotor assembly 2 is used as a core power member for generating a blood circulation flow of the blood pump.

Based on the above description and definition of the structure of the pump housing assembly 1, in this embodiment, the rotor 20 is in a hollow cylinder structure and sequentially penetrates the first inlet pipe 12a, the first pump chamber 10a and the second pump chamber 10b, and reference may be made to fig. 1 to fig. 4.

And to adapt the structure of the rotor 20, the first inlet pipe 12a in this embodiment is preferably designed as a straight pipe and arranged coaxially with the rotor 20. In addition, according to the product design requirement, the two axial ends of the rotor 20 do not extend out of the first inlet pipe 12a and the second pump chamber 10b, respectively.

Both impellers adopt centrifugal impeller structures, namely: with continued reference to fig. 4, the main impeller 21 includes a main upper cover 210 and a main lower cover 211 axially spaced along the rotor 20 and parallel to each other, and a plurality of main blades 212 spaced between the main upper cover 210 and the main lower cover 211 in a circular array, and similarly, the auxiliary impeller 22 includes an auxiliary upper cover 220, an auxiliary lower cover 221, and auxiliary blades 222, which respectively generate centrifugal force to the blood in the two pump chambers when the main impeller 21 and the auxiliary impeller 22 are driven to rotate.

In addition, the upper cover and the lower cover in the two impellers can generate hydrodynamic pressure with the inner walls of the two pump cavities, and the axial stability of the rotor assembly is maintained.

In addition, the upper cover and the lower cover in the two impellers also have a bearing function, namely: for receiving the axial support mechanism 32, as described in more detail below.

In order to achieve a better centrifugal drive and receiving function of the impeller, two impellers are also designed: the main impeller 21 and the auxiliary impeller 22 are parallel to each other and are arranged coaxially with the rotor 20, respectively.

And then, the supporting mechanism is related.

In the dual-core auxiliary centrifugal blood pump structure provided in the present embodiment, the supporting mechanism is used to provide radial suspension support and axial suspension support to the rotor assembly 2, so as to ensure that the rotor assembly 2 as a whole can always maintain a stable suspension state, that is: the support mechanism provides five degrees of freedom suspension support to the rotor assembly 2, including one axial degree of freedom, two radial degrees of freedom, and two radial degrees of freedom.

For the sake of brevity and clarity, the following definitions are first made: the two sets of radial supporting mechanisms are respectively defined as a radial supporting mechanism A30 and a radial supporting mechanism B31, wherein the radial supporting mechanism A30 is arranged between the rotor 20 and the partition plate 11, and the radial supporting mechanism B31 is arranged at one shaft end of the rotor 20 penetrating through the first inlet pipe 12 a.

The axial supporting mechanism 32 is provided on both sides of the two impellers opposite to each other and on the partition 11.

Specifically, in this embodiment, the specific structure and the mounting manner of the radial supporting mechanism a30 are as follows: with continued reference to fig. 1 to 3, the partition 11 is centrally provided with a mounting hole 110 for the rotor 20 to pass through and be arranged concentrically with the rotor 20; the radial supporting mechanism a30 is provided with an inner magnetic ring 300 fixedly arranged on the rotor 20 and an outer magnetic ring 301 sleeved outside the inner magnetic ring 300 and the rotor 20 and positioned in the mounting hole 110 at the same time, the inner magnetic ring 300 and the outer magnetic ring 301 are preferably made of neodymium-iron-boron strong permanent magnetic materials and magnetized by radial radiation, and the same-name magnetic poles of the inner magnetic ring 300 and the outer magnetic ring 301 are arranged opposite to each other.

Description: ① The "same-name magnetic pole is oppositely arranged" can be understood as: the N pole is opposite to the N pole, or the S pole is opposite to the S pole. Specifically, for the radial support mechanism a30, it can be understood that: the N pole of the inner magnetic ring 300 is opposite to the N pole of the outer magnetic ring 301, or the S pole of the inner magnetic ring 300 is opposite to the S pole of the outer magnetic ring 301. The following is the same. ② It can be understood that the inner magnetic ring 300 is a moving magnetic ring (because it is fixed to the rotor 20), the outer magnetic ring 301 is a fixed magnetic ring (because it is fixed to the partition 11), and since the inner magnetic ring 300 is disposed opposite to the same-name magnetic poles of the outer magnetic ring 301, a repulsive force is generated radially between the inner magnetic ring 300 and the outer magnetic ring 301, thereby forming a radial levitation support for the rotor 20. ③ Fig. 1 and 2 show the case where the S pole of the inner magnetic ring 300 is opposite to the S pole of the outer magnetic ring 301, but it is understood that the present embodiment may be designed as follows: the inner magnetic ring 300 is opposite to the N pole of the outer magnetic ring 301; this is also within the scope of the present patent.

Further preferably, in order to achieve the optimal radial repulsive force between the inner magnetic ring 300 and the outer magnetic ring 301, the axial thickness of the inner magnetic ring 300 is also designed to be not smaller than the axial thickness of the outer magnetic ring 301.

Further preferably, the structure for realizing the fixed arrangement of the inner magnetic ring 300 on the rotor 20 is as follows: with continued reference to fig. 2, a ring groove a200 is concavely formed in the portion of the rotor 20 penetrating the mounting hole 110, and the inner magnetic ring 300 is fixedly disposed in the ring groove a200 and is disposed coaxially with the rotor 20.

The structure for realizing the positioning of the outer magnetic ring 301 and being internally arranged in the mounting hole 110 is as follows: with continued reference to fig. 2 and fig. 3, the mounting hole 110 is provided with a central through hole 1100 for the rotor 20 to pass through, and a mounting groove ring 1101 surrounding the through hole 1100 and penetrating the through hole 1100, and the outer magnetic ring 301 is positioned and embedded in the mounting groove ring 1101.

It will be appreciated that as can be seen in fig. 3, the mounting groove ring 1101 is a U-shaped groove ring structure with a notch facing the through hole 1100.

Further preferably, the radial support mechanism a30 further includes a slide bearing 33 that can also provide radial support to the rotor 20. With continued reference to fig. 1 and fig. 2, the sliding bearing 33 includes an inner ring 330 and an outer ring 331 sleeved outside the inner ring 330, and the inner ring 330 of the sliding bearing 33 is fixedly embedded in the ring groove a200 and is simultaneously abutted against the outer wall of the inner magnetic ring 300 (it can be understood that the inner ring 330 is a moving ring); the outer ring 331 of the sliding bearing 33 is positioned and embedded in the mounting groove ring 1101, and is abutted against the inner wall of the outer magnetic ring 301 (it is understood that the outer ring 331 is a fixed ring).

Description: the sliding bearing 33 is a mechanical sliding bearing, which can also provide radial support for the rotor 20, but because the rotor assembly 2 mainly uses the radial suspension support function provided by two groups of radial support mechanisms, the sliding bearing 33 does not need long-term rotation friction, only plays a temporary auxiliary rigid support function when the blood pump is started and emergency states such as abnormality occur, and prevents the rigid impact of the rotor assembly; it will be appreciated that the sliding bearing 33, while helping to stabilize the radial suspension of the rotor assembly 2, is also a safety device, which can advantageously improve the stability and safety of the operation of the blood pump. In addition, with respect to the small gap between the inner ring 330 and the outer ring 331 of the sliding bearing 33, the center pressure balance between the two pump chambers can be used to prevent the leakage of blood between the two pump chambers, but even if there is a small amount of leakage of blood, serious problems such as pollution, fluid loss, etc. are not caused, so that the sliding bearing 33 does not need to be dynamically sealed; in particular, since a small amount of leakage is allowed at the sliding bearing 33, thrombus is not easily formed there, and there is no fear of leakage or contamination. In addition, in order to ensure the service life and safety of the sliding bearing 33, the outer ring 331 of the sliding bearing 33 is made of ceramic material, and the inner ring 330 is made of ceramic or precious stone material.

In this embodiment, the specific structure and the mounting manner of the radial supporting mechanism B31 are as follows: with continued reference to fig. 1, fig. 5, and fig. 6, the radial supporting mechanism B31 is provided with a plurality of groups of outer magnetic pieces 310 symmetrically surrounding the central axis of the rotor 20 as a center and arranged in a space surrounded by the plurality of groups of outer magnetic pieces 310 and simultaneously positioning an inner magnetic column 311 arranged in one axial end of the rotor 20, each group of outer magnetic pieces 310 is provided with a permanent magnet core and an electromagnet wrapped outside the permanent magnet core, and the permanent magnet cores and the same-name magnetic poles of the inner magnetic columns 311 are oppositely arranged to form radial repulsive magnetic force, so that the rotor 20 is suspended relative to the outer magnetic pieces 310; the electromagnet can provide electromagnetic force for adjusting the levitation pose of the inner magnetic column 311 and the rotor 20. Description: one axial end of the rotor 20 is an end of the rotor 20 penetrating through the first inlet pipe 12 a.

Further preferably, the inner magnetic column 311 is made of rare earth strong magnetic neodymium iron boron magnetic material and is axially magnetized. If the axial direction of the rotor 20 and/or the inner magnetic pole 311 is defined as the up-down direction, the arrangement of the magnetic poles of the inner magnetic pole 311 may be as follows: ① The upper shaft end of the inner magnetic column 311 is an N pole, and the lower shaft end is an S pole; or ② the upper shaft end of the inner magnetic column 311 is an S pole, and the lower shaft end is an N pole. Fig. 6 shows the first magnetic pole arrangement described above, but the patent of the invention is not limited thereto.

Based on the magnetic pole arrangement manner of the inner magnetic column 311, in this embodiment, the permanent magnet cores in each outer magnetic member 310 are configured to be two and respectively disposed opposite to two axial ends of the inner magnetic column 311, and simultaneously the two permanent magnet cores are also disposed in parallel along the axial direction of the inner magnetic column 311. Correspondingly, the electromagnets are also arranged in two and are respectively wrapped outside the two permanent magnet cores.

As can be appreciated, in each outer magnetic member 310, two permanent magnet cores are respectively defined as an upper permanent magnet core 3100a and a lower permanent magnet core 3100b, and the magnetic pole of the end of the upper permanent magnet core 3100a facing the inner magnetic post 311 is N pole, and the magnetic pole of the end of the lower permanent magnet core 3100b facing the inner magnetic post 311 is S pole, which can be achieved: balanced radial repulsive forces are formed between the upper permanent magnet core 3100a and the inner magnetic pole 311, and between the lower permanent magnet core 3100b and the inner magnetic pole 311, so as to provide stable (permanent magnet) radial levitation support for the inner magnetic pole 311 and the rotor 20.

In addition, in each of the outer magnetic members 310, two electromagnets are defined as an upper electromagnet 3101a and a lower electromagnet 3101b, respectively, the upper electromagnet 3101a is wrapped around the upper permanent magnet core 3100a, and the lower electromagnet 3101b is wrapped around the lower permanent magnet core 3100 b. And the upper electromagnet 3101a and the lower electromagnet 3101b are electrically connected to the controller respectively.

Description: ① The above "electromagnet" can be understood as an electromagnet coil, which belongs to a coreless electromagnet. ② The upper permanent magnet core 3100a in the plurality of groups of outer magnetic pieces 310 is symmetrically surrounded by the inner magnetic column 311 with the central axis of the inner magnetic column 311 as the center; correspondingly, the lower permanent magnet core 3100b in the plurality of groups of outer magnetic pieces 310 is also symmetrically surrounded by the inner magnetic column 311 with the central axis of the inner magnetic column 311 as the center. ③ When the upper shaft end of the inner magnetic pole 311 is an S pole and the lower shaft end is an N pole, the magnetic poles of the upper permanent magnet core 3100a and the lower permanent magnet core 3100b need to be adjusted accordingly, so as to ensure that stable radial suspension support is provided for the inner magnetic pole 311 and the rotor 20. This embodiment will not be described in detail here.

With continued reference to fig. 5 and 6, in the radial support mechanism B31, a magnetic bridge 3102 is further disposed in each of the outer magnetic members 310, for receiving two of the permanent magnet cores and two of the electromagnets.

Still more preferably, the permanent magnet core is made of rare earth neodymium iron boron ferromagnetic material; the magnetic bridge 3102 adopts soft magnets, which not only can enhance the strong magnetic induction intensity of the electromagnet, but also can form different magnetic loops, thereby facilitating magnetic suspension.

In addition, in the radial support mechanism B31, a displacement sensor 312 is further disposed beside each of the outer magnetic members 310 for sensing the radial levitation offset of the inner magnetic pole 311 and the rotor 20.

Specifically, ① the displacement sensor 312 is disposed in association with the outer magnetic member 310 (specifically, the electromagnet) to sense the position and offset of the inner magnetic column 311 and/or the rotor 20 in real time; and the displacement sensor 312 is further communicatively connected to the controller, so that the controller can control the magnetic pole change of each electromagnet, and further realize that the electromagnets in the plurality of groups of outer magnetic pieces 310 cooperate to adjust the levitation pose of the inner magnetic column 311, so that the inner magnetic column 311 and the rotor 20 recover to the normal levitation state (central position).

It can be understood that, in this embodiment, the electromagnet is used to actively and electromagnetically control the inner magnetic column 311, and a specific control method is described as follows:

Referring to fig. 7, when the inner magnetic column 311 is shifted to the left, the outer magnetic member 310 is located near the left, and then the displacement sensor 312 located at the left timely collects information of the shift position and the maximum shift amount of the inner magnetic column 311, and transmits the information to the controller, and after the information is processed by the controller and amplified, four sets of current signals (the magnitude and the direction of the current are numerical control) are rapidly output to four electromagnets, and it can be understood that the four electromagnets respectively belong to two outer magnetic members 310 arranged along the left-right direction; then, after the upper electromagnet 3101a and the lower electromagnet 3101b located on the left side are energized, electromagnetic repulsive force is generated to the inner magnetic pole 311, that is, the upper electromagnet 3101a and the lower electromagnet 3101b on the left side are respectively disposed opposite to the same-name magnetic poles of the inner magnetic pole 311; meanwhile, after the upper electromagnet 3101a and the lower electromagnet 3101b located on the right are energized, electromagnetic attraction force is generated on the inner magnetic column 311, that is, the upper electromagnet 3101a and the lower electromagnet 3101b on the right are respectively arranged opposite to the synonym magnetic poles of the inner magnetic column 311; at that time, the offset inner magnetic column 311 returns to the center position in time under the dual action of the repulsive force and attractive force of the electromagnetic force; after the inner magnetic column 311 is reset, the controller actively cuts off the feeding current.

The magnetic levitation device is an active magnetic levitation mechanism for regulating and controlling two radial displacement degrees of freedom through an electromagnet (electromagnetic force), and when the electromagnetic force regulation is finished, basic magnetic force balance and radial levitation of the inner magnetic column 311 are maintained by means of radial repulsive force between the permanent magnet core and the inner magnetic column 311.

② The invention is not limited in its specific placement relative to the electromagnet, as determined by the specific design requirements. In addition, the displacement sensor 312 may preferably be an eddy current sensor or a hall sensor.

In addition, in the present embodiment, the number of the outer magnetic members 310 may be configured to be an even number of 4 to 12, which is specifically determined according to the application requirement, which also reflects that the applicability of the radial support mechanism B31 of the present invention is strong and the applicable product range is wide.

In this embodiment, the specific structure and the mounting manner of the axial supporting mechanism 32 are as follows: with continued reference to fig. 1 to 3, the axial supporting mechanism 32 is provided with magnetic ring bodies 320, where the magnetic ring bodies 320 are configured as three and respectively positioned on two opposite sides of the two impellers and on the partition 11, and the three magnetic ring bodies 320 are also parallel to each other and are all coaxially arranged with the rotor 20 (it can be understood that the three magnetic ring bodies 320 are axially spaced and arranged in parallel along the rotor 20); in addition, the three magnetic ring bodies 320 are all preferably made of strong neodymium iron boron materials and are all axially magnetized, and the homonymous magnetic poles of every two adjacent magnetic ring bodies 320 are oppositely arranged.

It can be understood that, the two magnetic ring bodies 320 disposed on the two impellers in ① are moving magnetic rings, the magnetic ring bodies 320 disposed on the partition 11 are fixed magnetic rings, and the same-name magnetic poles of each two adjacent magnetic ring bodies 320 are disposed opposite to each other, so that an axial repulsive force is generated between the fixed magnetic rings and the two moving magnetic rings, thereby forming an axial suspension support for the two impellers. ② If the axial direction of the rotor 20 is defined as the up-down direction, fig. 1 and 2 show the case where the fixed magnetic ring (located on the partition 11) is disposed opposite to the N pole of the moving magnetic ring above it (located on the main lower cover 211 of the main impeller 21), and the fixed magnetic ring (located on the partition 11) is disposed opposite to the S pole of the moving magnetic ring below it (located on the auxiliary upper cover 220 of the auxiliary impeller 22), but it is understood that the embodiment may also be designed as follows: the fixed magnetic ring is opposite to the S pole of one movable magnetic ring above the fixed magnetic ring, and the fixed magnetic ring is opposite to the N pole of one movable magnetic ring below the fixed magnetic ring; this is also within the scope of the present patent.

Further preferably, in combination with the above description of the structure of the impeller, the magnetic ring bodies 320 are fixedly disposed on the main lower cover 211 of the main impeller 21 and the sub upper cover 220 of the sub impeller 22, respectively.

In addition, the structure of the magnetic ring 320 disposed on the partition 11 is as follows: with continued reference to fig. 1 to 3, the partition 11 is further provided with a ring groove B111 surrounding the mounting hole 110 and arranged concentrically with the mounting hole 110; the magnetic ring body 320 is positioned and embedded in the annular groove B111.

Further preferably, to better ensure the axial levitation of the rotor assembly 2 is smooth, the present embodiment also defines the axial support mechanism 32 as follows: the inner and outer diameters of the three magnetic ring bodies 320 are equal, and the axial thicknesses of the two magnetic ring bodies 320 positioned on the two impellers are equal.

And then, the driving mechanism 4.

In the dual-core auxiliary centrifugal blood pump structure provided in this embodiment, the driving mechanism 4 is used to power the rotor assembly 2 to drive the rotor assembly 2 to perform a rotation operation.

In this embodiment, the specific structure and the mounting manner of the driving mechanism 4 are as follows: with continued reference to fig. 1, the driving mechanism 4 includes a casing 40 fixedly sleeved outside the first inlet pipe 12a, a stator winding 41 positioned between the casing 40 and the first inlet pipe 12a, and a rotor magnetic steel 42 disposed in a space surrounded by the stator winding 41 and positioned in the rotor 20. When the stator winding 41 is energized, the magnetic field generated by the stator winding 41 can drive the rotor magnetic steel 42 to rotate, and further drive the rotor assembly 2 to synchronously rotate.

Further preferably, the rotor magnetic steel 42 is disposed in the rotor 20 by a tight-fitting manner, and as can be seen in fig. 1, the rotor magnetic steel 42 is located beside the inner magnetic column 311 and is disposed at an axial distance from the inner magnetic column 311 along the rotor 20.

In addition, as can be seen from fig. 1, the housing 40 is also fixedly connected to the outer wall of the pump housing body 10, namely: the casing 40, the first inlet pipe 12a and the pump casing body 10 together define a housing cavity; the stator winding 41 and the plurality of sets of the outer magnetic members 310 are respectively and fixedly disposed in the accommodating cavity (i.e., the stator winding 41 and the plurality of sets of the outer magnetic members 310 are respectively and fixedly disposed between the casing 40 and the first inlet pipe 12 a). And it can be understood that the stator winding 41 and the plurality of groups of the outer magnetic pieces 310 are arranged in a one-to-one correspondence with the rotor magnetic steel 42 and the inner magnetic column 311 respectively.

In conclusion, the double-heart auxiliary centrifugal blood pump has the double-heart auxiliary function, is novel, reasonable and concise in structure, small in size, light in weight and stable in operation, reduces implantation invasiveness of the blood pump, reduces manufacturing cost of the blood pump, and well meets clinical requirements.

In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only of a preferred embodiment of the invention, which can be practiced in many other ways than as described herein, so that the invention is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims (10)

1. A dual-heart assisted centrifugal blood pump, characterized in that: comprising the following steps:

A pump housing assembly (1) provided with a pump housing main body (10), a partition plate (11) which is arranged on the pump housing main body (10) and divides the pump housing main body (10) into two pump cavities, and two groups of pipe assemblies which are respectively correspondingly communicated with the two pump cavities; each group of the pipe assemblies is provided with an inlet pipe capable of communicating the pump cavity with the human ventricle and an outlet pipe capable of communicating the pump cavity with the human aorta or the human pulmonary aorta;

the rotor assembly (2) is provided with two rotors (20) penetrating through the two pump cavities and one inlet pipe in sequence and two impellers which are axially spaced along the rotors (20) and fixedly sleeved outside the rotors (20); the two impellers are respectively arranged in the two pump cavities;

The support mechanism is provided with two groups of radial support mechanisms which are axially arranged on the rotor (20) at intervals along the rotor (20) and can provide radial suspension support for the rotor (20), and an axial support mechanism (32) which is arranged between the two impellers and can provide axial suspension support for the impellers, and the two groups of radial support mechanisms and the axial support mechanism (32) cooperate to ensure that the rotor assembly (2) is in a stable suspension state as a whole;

And the driving mechanism (4) is connected with the rotor (20) and can drive the rotor assembly (2) to integrally rotate, so that the two impellers respectively drive the blood in the two pump cavities to circularly flow.

2. The dual-heart assisted centrifugal blood pump of claim 1 wherein: defining two of said pump chambers as a first pump chamber (10 a) and a second pump chamber (10 b), respectively;

Correspondingly, the inlet pipe and the outlet pipe which are communicated with the first pump cavity (10 a) are respectively defined as a first inlet pipe (12 a) and a first outlet pipe (13 a), the first inlet pipe (12 a) can be communicated with the first pump cavity (10 a) and the left ventricle of the human body, and the first outlet pipe (13 a) can be communicated with the first pump cavity (10 a) and the aorta of the human body;

The inlet pipe and the outlet pipe which are communicated with the second pump cavity (10 b) are respectively defined as a second inlet pipe (12 b) and a second outlet pipe (13 b), the second inlet pipe (12 b) can be communicated with the second pump cavity (10 b) and the right ventricle of the human body, and the second outlet pipe (13 b) can be communicated with the second pump cavity (10 b) and the pulmonary aorta of the human body.

3. The dual-heart assisted centrifugal blood pump of claim 2 wherein: the rotor (20) is of a hollow cylinder structure and sequentially penetrates through the first inlet pipe (12 a), the first pump cavity (10 a) and the second pump cavity (10 b);

Correspondingly, the first inlet pipe (12 a) is straight and is arranged coaxially with the rotor (20); and, two of said impellers are mutually parallel and are also arranged coaxially with said rotor (20), respectively.

4. A dual-heart assisted centrifugal blood pump according to claim 3 wherein: two groups of radial supporting mechanisms are respectively defined as a radial supporting mechanism A (30) and a radial supporting mechanism B (31), wherein the radial supporting mechanism A (30) is arranged between the partition plate (11) and the rotor (20), and the radial supporting mechanism B (31) is arranged at one shaft end of the rotor (20) penetrating through the first inlet pipe (12 a);

The axial supporting mechanisms (32) are arranged on two opposite sides of the impellers and on the partition plate (11).

5. The dual heart assist centrifugal blood pump of claim 4 wherein: the partition plate (11) is provided with a mounting hole (110) for the rotor (20) to pass through and be arranged with the rotor (20) in the same center line;

The radial supporting mechanism A (30) is provided with an inner magnetic ring (300) fixedly arranged on the rotor (20) and an outer magnetic ring (301) sleeved outside the inner magnetic ring (300) and the rotor (20) and positioned in the mounting hole (110) at the same time, and the same-name magnetic poles of the inner magnetic ring (300) and the outer magnetic ring (301) are arranged oppositely.

6. The dual heart assist centrifugal blood pump of claim 5, wherein: the inner magnetic ring (300) and the outer magnetic ring (301) are magnetized in the radial direction;

a circle of ring groove A (200) is concavely arranged at the position of the rotor (20) penetrating through the mounting hole (110), and the inner magnetic ring (300) is fixedly arranged in the ring groove A (200) and is coaxially arranged with the rotor (20);

the mounting hole (110) is provided with a through hole part (1100) which is centered and used for the rotor (20) to pass through and a mounting groove ring (1101) which is surrounded on the through hole part (1100) and is communicated with the through hole part (1100), and the outer magnetic ring (301) is positioned and embedded in the mounting groove ring (1101);

The support mechanism is also provided with a sliding bearing (33) which can provide radial support for the rotor (20), and an inner ring body (330) of the sliding bearing (33) is fixedly embedded in the annular groove A (200) and is simultaneously abutted against the outer wall of the inner magnetic ring (300); the outer ring body (331) of the sliding bearing (33) is positioned and embedded in the mounting groove ring (1101) and is simultaneously abutted against the inner wall of the outer magnetic ring (301).

7. The dual heart assist centrifugal blood pump of claim 4 wherein: the radial supporting mechanism B (31) is provided with a plurality of groups of outer magnetic pieces (310) which are symmetrically arranged outside the first inlet pipe (12 a) in a surrounding mode by taking the central axis of the rotor (20) as a center, and inner magnetic columns (311) which are arranged in a space surrounded by the outer magnetic pieces (310) and are positioned in one axial end of the rotor (20) at the same time, each group of outer magnetic pieces (310) is provided with a permanent magnet iron core and an electromagnet which wraps the outer side of the permanent magnet iron core, and the permanent magnet iron cores and the homonymous magnetic poles of the inner magnetic columns (311) are oppositely arranged to form radial repulsive magnetic force, so that the rotor (20) is suspended relative to the outer magnetic pieces (310); the electromagnet can provide electromagnetic force for adjusting the suspension pose of the inner magnetic column (311) and the rotor (20).

8. The dual heart assist centrifugal blood pump of claim 5, wherein: the axial supporting mechanism (32) is provided with three magnetic ring bodies (320), the magnetic ring bodies (320) are respectively arranged on two opposite sides of the two impellers and the partition board (11), and the three magnetic ring bodies (320) are mutually parallel and are coaxially arranged with the rotor (20);

in addition, the three magnetic ring bodies (320) are magnetized in the axial direction, and homonymous magnetic poles of every two adjacent magnetic ring bodies (320) are oppositely arranged.

9. The dual-heart assisted centrifugal blood pump of claim 8 wherein: the partition plate (11) is also provided with a ring groove B (111) which is arranged outside the mounting hole (110) in a surrounding manner and is arranged with the mounting hole (110) in the same center line; the magnetic ring body (320) is positioned and embedded in the annular groove B (111);

in addition, the inner diameter and the outer diameter of the three magnetic ring bodies (320) are equal, and the axial thickness of the two magnetic ring bodies (320) positioned on the two impellers is equal.

10. The dual heart assist centrifugal blood pump of claim 7 wherein: the driving mechanism (4) comprises a casing (40) fixedly sleeved outside the first inlet pipe (12 a), a stator winding (41) positioned between the casing (40) and the first inlet pipe (12 a), and rotor magnetic steel (42) which is arranged in a space surrounded by the stator winding (41) and is positioned in the rotor (20) at the same time;

In addition, a plurality of groups of the outer magnetic pieces (310) are also positioned and arranged between the shell (40) and the first inlet pipe (12 a) and are axially spaced from the stator winding (41) along the rotor (20); correspondingly, the inner magnetic columns (311) and the rotor magnetic steel (42) are also arranged at intervals along the axial direction of the rotor (20).