阅读说明：本技术 一种体外循环磁悬浮轴流血泵 (Extracorporeal circulation magnetic suspension axial flow blood pump ) 是由 唐雨萌 谢楠 柳阳威 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种体外循环磁悬浮轴流血泵,包括：进口管、转子叶轮泵壳、出口管,具有永磁体套筒及螺旋式转子叶片的转子叶轮；通过将永磁体组件内置于永磁体套筒中,减小了永磁体组件与血泵外电磁控制系统的距离,便于电磁控制系统对转子叶轮的控制；螺旋式转子叶片及后导锥结构有助于减小血泵出流的脉动强度；所采用的回流狭缝结构实现了转子叶轮与静止的转子叶轮泵壳间的血液冲洗；与传统的轴流血泵相比,本发明有效降低了转子叶片与转子叶轮泵壳之间的相互作用,抑制了溶血,降低了血栓形成风险,提高了血泵的运转稳定性。(The invention discloses an extracorporeal circulation magnetic suspension axial flow blood pump, which comprises: the rotor comprises an inlet pipe, a rotor impeller pump shell, an outlet pipe, a rotor impeller with a permanent magnet sleeve and spiral rotor blades; the permanent magnet assembly is arranged in the permanent magnet sleeve, so that the distance between the permanent magnet assembly and an electromagnetic control system outside the blood pump is reduced, and the electromagnetic control system can conveniently control the rotor impeller; the spiral rotor blade and the rear guide cone structure are beneficial to reducing the pulsation intensity of outflow of the blood pump; the adopted backflow slit structure realizes the blood flushing between the rotor impeller and the static rotor impeller pump shell; compared with the traditional axial flow blood pump, the axial flow blood pump effectively reduces the interaction between the rotor blades and the rotor impeller pump shell, inhibits hemolysis, reduces the risk of thrombosis and improves the running stability of the blood pump.)

1. An extracorporeal circulation magnetic suspension axial flow blood pump, comprising: a transparent pump casing assembly (1) and a rotor impeller (2); the transparent pump shell assembly (1) is made of polyurethane; the transparent pump shell assembly (1) comprises an inlet pipe (3), a rotor impeller pump shell (4) and an outlet pipe (5); the rotor impeller (2) is positioned in the transparent pump shell assembly (1), the side edges of the rotor impeller (2) and the transparent pump shell assembly (1) are provided with backflow slits (6), and the width of the backflow slits (6) is 0.5-1.5 mm; the rotor impeller (2) comprises rotor blades (7), a front guide cone (8), a rotor impeller shaft (9), a rear guide cone (10), a permanent magnet sleeve (11) and a permanent magnet assembly (12), wherein the permanent magnet assembly (12) is arranged in the permanent magnet sleeve (11); the permanent magnet sleeve (11) is a circular pipe with equal thickness, and the edge of the permanent magnet sleeve (11) is subjected to rounding treatment; the rotor blades (7) are spiral and are distributed between the permanent magnet sleeve (11) and the rotor impeller shaft (9) at equal intervals in turn; the permanent magnet assembly (12) comprises a front axial annular permanent magnet (13), a radial annular permanent magnet (14) and a rear axial annular permanent magnet (15) which are positioned in the permanent magnet sleeve (11), wherein the front axial annular permanent magnet (13) and the rear axial annular permanent magnet (15) are used for axially positioning the rotor impeller (2), and the radial annular permanent magnet (14) is used for radially positioning the rotor impeller (2); the incoming flow side of the rotor blade (7) is provided with a rotor blade front edge (16), the tail of the rotor blade (7) is provided with a rotor blade tail edge (17), and the rotor blade front edge (16) and the rotor blade tail edge (17) are subjected to rounding treatment.

2. An extracorporeal circulation magnetic levitation axial flow blood pump according to claim 1, characterised in that the inner surface of the transparent pump housing assembly (1) and the surface of the rotor impeller (2) are sprayed with an anti-coagulant coating to reduce the risk of platelet activation coagulation forming thrombus.

3. The extracorporeal circulation magnetic suspension axial flow blood pump according to claims 1 to 2, wherein the diameters of the inlet tube (3), the rotor impeller shaft (9) and the outlet tube (5) are equal and 10 to 12 mm, the diameter of the rotor impeller pump casing (4) is 20 mm, the axial length of the permanent magnet sleeve (11) is 25 mm, the axial length of the rotor blade (7) is 22 mm, the molded lines of the front guide cone (8) and the rear guide cone (10) are smoothly transited to the rotor impeller shaft (9), the axial dimension of the front guide cone (8) is 10 to 12 mm, and the axial dimension of the rear guide cone (10) is 15 to 18 mm.

Technical Field

The invention relates to the technical field of artificial heart pumps, in particular to an extracorporeal circulation magnetic suspension axial flow blood pump.

Background

Severe acute myocarditis, acute heart failure, acute myocardial infarction and other diseases or cardiac surgery can cause insufficient blood supply of tissues and organs, and even cardiac arrest can be caused seriously. The extracorporeal membrane lung oxygenation technology can better cope with the situations, the core devices of the extracorporeal membrane lung oxygenation technology are an artificial blood pump and an artificial lung, but serious hemolysis and thrombus often exist in the artificial blood pump, so that a plurality of complications of a patient occur, and the death risk of the patient is increased. Most of the existing commercial axial blood pumps adopt a mechanical support bearing to ensure the stable operation of a rotor impeller, and due to the problems of bearing abrasion and frictional heat caused by high-speed rotation, easy blood pollution of a sealing device and the like, thrombus and hemolysis are easy to occur at the mechanical bearing and a high-shear stress area, and the life safety of a patient is seriously harmed. The design of the blood pump flow channel is improved, so that the internal shearing stress of the blood pump is reduced, and the problem of blood compatibility such as hemolysis and thrombosis is reduced, thereby having important significance for improving the performance of the blood pump.

Disclosure of Invention

The invention aims to provide an extracorporeal circulation magnetic suspension axial flow blood pump which can be matched with devices such as an artificial lung and the like to provide extracorporeal short and medium cycle support, improve the problem of blood compatibility in the prior art and reduce the complication and mortality of patients.

The technical scheme adopted by the invention is as follows: an extracorporeal circulation magnetic levitation axial flow blood pump comprising: a transparent pump housing assembly and a rotor impeller; the transparent pump shell assembly is made of polyurethane; the transparent pump shell assembly comprises an inlet pipe, a rotor impeller pump shell and an outlet pipe; the rotor impeller is positioned in the transparent pump shell assembly, backflow slits are arranged on the side edges of the rotor impeller and the transparent pump shell assembly, and the width of each backflow slit is 0.5-1.5 mm; the rotor impeller comprises rotor blades, a front guide cone, a rotor impeller shaft, a rear guide cone, a permanent magnet sleeve and a permanent magnet assembly, wherein the permanent magnet assembly is arranged in the permanent magnet sleeve; the permanent magnet sleeve is a circular pipe with equal thickness, and the edge of the permanent magnet sleeve is subjected to rounding treatment; the rotor blades are spiral and are distributed between the permanent magnet sleeve and the rotor impeller shaft at equal intervals in an alternating mode, and the number of the rotor blades is four; the permanent magnet assembly comprises a front axial annular permanent magnet, a radial annular permanent magnet and a rear axial annular permanent magnet which are positioned in the permanent magnet sleeve, wherein the front axial annular permanent magnet and the rear axial annular permanent magnet are used for axially positioning the rotor impeller, and the radial annular permanent magnet is used for radially positioning the rotor impeller; the incoming flow side of the rotor blade is provided with a rotor blade front edge, the tail of the rotor blade is provided with a rotor blade tail edge, and the rotor blade front edge and the rotor blade tail edge are both subjected to rounding treatment.

Further, the inner surface of the transparent pump housing assembly and the surface of the rotor impeller are sprayed with an anti-coagulant coating to reduce the risk of platelet activation coagulation to form thrombus.

Further, the diameters of the inlet pipe, the rotor impeller shaft and the outlet pipe are equal and are all 10-12 mm, the diameter of the rotor impeller pump shell is 20 mm, the axial length of the permanent magnet sleeve is 25 mm, the axial length of the rotor blade is 22 mm, molded lines of the front guide cone and the rear guide cone are smoothly transited to the rotor impeller shaft, the axial size of the front guide cone is 10-12 mm, and the axial size of the rear guide cone is 15-18 mm.

The invention has the beneficial effects that: according to the extracorporeal circulation magnetic suspension axial flow blood pump provided by the invention, the spiral rotor blade and the rear guide cone structure are adopted, so that the pulsation intensity of the outflow of the blood pump is effectively reduced, and a better inflow condition is provided for an artificial lung; compared with the traditional rotor impeller, the rotor impeller comprising the permanent magnet sleeve effectively reduces the interaction between the rotor blades and the pump shell of the rotor impeller, inhibits hemolysis, reduces the risk of thrombosis, and overcomes the defect that the axial-flow blood pump rotor in the traditional design is easy to generate thrombus at the mechanical bearing because the axial and radial positions are fixed by the mechanical bearing; the backflow slit structure adopted by the invention realizes the blood flushing between the rotor impeller and the static rotor impeller pump shell, and effectively reduces the risk of thrombosis; the permanent magnet assembly arranged in the permanent magnet sleeve is closer to the electromagnetic control system arranged outside the transparent pump shell assembly, so that the control effect of the electromagnetic control system on the rotor impeller is enhanced, and the running stability of the blood pump is improved.

Drawings

FIG. 1 is a cross-sectional view of the apparatus of the present invention;

FIG. 2 is a front view of the apparatus of the present invention;

FIG. 3 is a left side view of the device of the present invention;

FIG. 4 is a right side view of the apparatus of the present invention;

FIG. 5 is a schematic view of a rotor wheel of the present invention that does not include a permanent magnet sleeve;

FIG. 6 is a schematic view of a permanent magnet sleeve according to the present invention;

FIG. 7 is a schematic view of the internal flow of the apparatus of the present invention;

wherein, 1: a transparent pump housing assembly; 2: a rotor impeller; 3: an inlet pipe; 4: a rotor impeller pump housing; 5: an outlet pipe; 6: a reflow slit; 7: a rotor blade; 8: a leading cone; 9: a rotor impeller shaft; 10: a rear guide cone; 11: a permanent magnet sleeve; 12: a permanent magnet assembly; 13: a front axial annular permanent magnet; 14: a radial annular permanent magnet; 15: a rear axial annular permanent magnet; 16: a rotor blade leading edge; 17: the rotor blade trailing edge.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, which are included by way of illustration and not by way of limitation.

As shown in fig. 1 and fig. 2, an extracorporeal circulation magnetic levitation axial flow blood pump includes: a transparent pump housing assembly 1 and a rotor impeller 2; the transparent pump shell component 1 is made of polyurethane; the transparent pump shell assembly 1 comprises an inlet pipe 3, a rotor impeller pump shell 4 and an outlet pipe 5, wherein the inlet pipe 3 and the rotor impeller pump shell 4 are in smooth transition, and the rotor impeller pump shell 4 and the outlet pipe 5 are in smooth transition, so that the flow separation is effectively prevented, and good inflow and outflow conditions are provided for the rotor impeller 2; the rotor impeller 2 is positioned in the transparent pump shell assembly 1, the side edges of the rotor impeller 2 and the transparent pump shell assembly 1 are provided with the backflow slits 6, the width of the backflow slits 6 is 0.5-1.5 mm, the flow of blood in the backflow slits 6 is influenced by the pressure difference between the upstream and the downstream of the rotor impeller 2, and the backflow slits 6 are effectively flushed under the working condition of clinical application, so that the risk of thrombus generation at the position is reduced; the rotor impeller 2 comprises rotor blades 7, a front guide cone 8, a rotor impeller shaft 9, a rear guide cone 10, a permanent magnet sleeve 11 and a permanent magnet assembly 12, wherein the permanent magnet assembly 12 is arranged in the permanent magnet sleeve 11; the permanent magnet sleeve 11 is a circular tube with equal thickness, and the edges of the permanent magnet sleeve 11 are rounded, so that the risk of flow separation of blood flow is reduced, and the blood compatibility is enhanced; the rotor blades 7 are spiral and are distributed between the permanent magnet sleeve 11 and the rotor impeller shaft 9 at equal intervals in turn; the permanent magnet assembly 12 comprises a front axial annular permanent magnet 13, a radial annular permanent magnet 14 and a rear axial annular permanent magnet 15 which are positioned in the permanent magnet sleeve 11, wherein the front axial annular permanent magnet 13 and the rear axial annular permanent magnet 15 are used for axially positioning the rotor impeller 2, and the radial annular permanent magnet 14 is used for radially positioning the rotor impeller 2, so that the stable rotation of the rotor impeller 2 is jointly ensured, and hemolysis caused by the rotation oscillation of the rotor impeller 2 is avoided; the incoming flow side of the rotor blade 7 is provided with a rotor blade front edge 16, the tail of the rotor blade 7 is provided with a rotor blade tail edge 17, and the rotor blade front edge 16 and the rotor blade tail edge 17 are both subjected to rounding treatment so as to weaken the scraping effect of the rotor blade 7 on blood and reduce blood damage.

The inner surface of the transparent pump housing assembly 1 and the surface of the rotor wheel 2 are sprayed with an anti-coagulant coating to reduce the risk of platelet-activated coagulation forming thrombi.

As shown in fig. 3 and 4, the diameters of the inlet pipe 3, the rotor impeller shaft 9 and the outlet pipe 5 are equal and are all 10 to 12 mm, the diameter of the rotor impeller pump shell 4 is 20 mm, the axial length of the permanent magnet sleeve 11 is 25 mm, and the axial dimension of the rotor blade 7 is 22 mm, as shown in fig. 5, the molded lines of the front guide cone 8 and the rear guide cone 10 smoothly transition to the rotor impeller shaft 9, the axial dimension of the front guide cone 8 is 10 to 12 mm, the axial dimension of the rear guide cone 10 is 15 to 18 mm, and the rear guide cone 10 enables the blood flow to smoothly flow out of the blood pump by regulating and controlling the area of the flow passage.

Specifically, as shown in fig. 7, blood flows into the blood pump through the inlet tube 3, flows into the rotor impeller 2 under the drainage action of the front guide cone 8, is accelerated and pressurized under the rotation action of the rotor impeller 2, flows into the outlet tube 5 through the overflowing channel between the rear guide cone 10 and the rotor impeller pump shell 4, and flows out of the blood pump through the outlet tube 5; after a small part of blood flows out of the rotor impeller 2, the blood flows back to the front side of the rotor impeller 2 through the backflow slit 6 under the action of the pressure difference between the upstream and the downstream of the rotor impeller 2, so that the blood flushing between the rotor impeller 2 and the static rotor impeller pump shell 4 is realized, and the risk of thrombosis is further reduced.

The first embodiment is as follows: stable cycle conditions in clinic

In clinical application, the external electromagnetic control system outside the pump is connected outside the extracorporeal circulation magnetic suspension axial flow blood pump, the rotation of the rotor impeller 2 is controlled by the external electromagnetic system, and the front axial annular permanent magnet 13, the radial annular permanent magnet 14 and the rear axial annular permanent magnet 15 which are positioned in the permanent magnet sleeve 11 are controlled by corresponding electromagnetism. The axial position of the rotor impeller 2 is controlled by controlling the front axial annular permanent magnet 13 and the rear axial annular permanent magnet 15, and the radial position of the rotor impeller 2 is controlled by controlling the radial annular permanent magnet 14, so that the stable rotation of the rotor impeller 2 is ensured together.

Under the stable circulation working condition, blood flows into the blood pump through the inlet pipe 3, flows into the rotor impeller 2 under the drainage action of the front guide cone 8, is accelerated and pressurized under the rotation action of the rotor impeller 2, and then flows out of the blood pump through the rear guide cone 10 and the outlet pipe 5. A small part of blood flows into the backflow slit 6 and flows back to the front side of the rotor impeller 2 under the influence of the upstream and downstream pressure difference of the rotor impeller 2, and then is converged with the incoming flow at the front side of the rotor impeller 2 and flows into the rotor impeller 2 again, so that the blood flushing between the rotor impeller 2 and the static rotor impeller pump shell 4 is realized, the risk of thrombosis is effectively reduced, and the blood compatibility is improved.

Example two: machine removal state

In a machine withdrawal state, the extracorporeal circulation magnetic suspension axial flow blood pump maintains the simulation process in the first embodiment, gradually reduces the rotating speed of the rotor impeller 2 by monitoring human body circulation signs, and gradually reduces the blood flow until the blood flow is zero; and after the human body completely recovers the autonomous circulation, removing the blood pump, and finishing machine withdrawal.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.