阅读说明：本技术 一种体外循环磁悬浮混流血泵 (Extracorporeal circulation magnetic suspension mixed flow blood pump ) 是由 柳阳威 谢楠 唐雨萌 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混流血泵,包括进口管、转子叶轮泵壳、环形蜗壳、出口管,及由转子叶片、中心导锥、永磁体套筒、永磁体组件组成的转子叶轮；所述中心导锥和所述永磁体套筒中内置有永磁体组件,可有效减小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,有利于血泵的安全稳定运转；通过在转子叶轮和透明泵壳组件之间设置侧边回流狭缝和底部狭缝,避免叶顶间隙泄漏涡所造成的溶血,并抑制血栓的发生；本发明可有效减少流动分离并降低转子叶片与转子叶轮泵壳的转静干涉作用,为透明泵壳组件内表面以及转子叶轮表面提供有效冲洗,防止形成流动死区,降低患者并发症与死亡率。(The invention discloses an extracorporeal circulation magnetic suspension mixed flow blood pump, which comprises an inlet pipe, a rotor impeller pump shell, an annular volute, an outlet pipe and a rotor impeller, wherein the rotor impeller consists of rotor blades, a central guide cone, a permanent magnet sleeve and a permanent magnet assembly; the permanent magnet assemblies are arranged in the central guide cone and the permanent magnet sleeve, so that the distance between the permanent magnet assemblies and an electromagnetic control system outside the blood pump can be effectively reduced, the electromagnetic control system can conveniently control the rotor impeller, and the safe and stable operation of the blood pump is facilitated; by arranging the side backflow slit and the bottom slit between the rotor impeller and the transparent pump shell component, hemolysis caused by leakage vortex of a blade top gap is avoided, and thrombus is inhibited; the invention can effectively reduce flow separation and reduce the static interference effect of the rotor blade and the rotor impeller pump shell, provides effective washing for the inner surface of the transparent pump shell assembly and the surface of the rotor impeller, prevents the formation of a flow dead zone, and reduces the complication and mortality of patients.)

1. An extracorporeal circulation magnetic suspension mixed flow blood pump, comprising: the transparent pump shell assembly (1) is made of polyurethane, and the transparent pump shell assembly (1) comprises an inlet pipe (3), a rotor impeller pump shell (4), an annular volute (5) and an outlet pipe (6); a tongue-shaped volute tongue (7) is arranged at the joint of the outlet pipe (6) and the annular volute (5), and the radius of the volute tongue (7) is 0.2-1.5 mm; the rotor impeller (2) is positioned in the transparent pump shell assembly (1), side backflow slits (8) are arranged on the side edges of the rotor impeller (2) and the transparent pump shell assembly (1), a bottom slit (9) is arranged below the rotor impeller (2) and the transparent pump shell assembly (1), the width of each side backflow slit (8) is 0.5-1.5 mm, and the width of each bottom slit (9) is 0.5-1.0 mm; the rotor impeller (2) comprises rotor blades (10), a central guide cone (11), a permanent magnet sleeve (12) and a permanent magnet assembly (13), wherein the permanent magnet assembly (13) is arranged in the central guide cone (11) and the permanent magnet sleeve (12) in an embedded mode; the permanent magnet assembly (13) comprises an upper axial annular permanent magnet (14) and a radial annular permanent magnet (15) which are positioned in a permanent magnet sleeve (12), and a lower axial permanent magnet (16) which is positioned in the central guide cone (11), wherein the upper axial annular permanent magnet (14) and the lower axial permanent magnet (16) are used for axially positioning the rotor impeller (2), and the radial annular permanent magnet (15) is used for radially positioning the rotor impeller (2); the rotor blades (10) are spiral and are distributed between the central guide cone (11) and the permanent magnet sleeve (12) at equal intervals in an alternating mode, and the number of the rotor blades is 4; rotor blade (10) are provided with rotor blade leading edge (17) in the incoming flow side, rotor blade (10) are provided with rotor blade trailing edge (18) at the afterbody, rotor blade leading edge (17) and rotor blade trailing edge (18) are through the radius processing to reduce the effect of scraping to blood, reduce blood damage.

2. An extracorporeal circulation magnetic suspension mixed flow blood pump according to claim 1, wherein the inner surface of the transparent pump housing assembly (1) and the surface of the rotor impeller (2) are coated with an anticoagulant coating to reduce the risk of platelet activation coagulation to form thrombus.

3. The extracorporeal circulation magnetic suspension mixed flow blood pump according to claim 1, wherein the permanent magnet sleeve (12) is conical, the radius of the inner bottom of the permanent magnet sleeve (12) is 2 to 3 mm, the lower tangential direction of the permanent magnet sleeve (12) is horizontal, and the radius of the outer bottom of the permanent magnet sleeve (12) is 0.2 to 1 mm.

4. An extracorporeal circulation magnetic suspension mixed flow blood pump according to any of claims 1 to 3, wherein the water-cut cross-section of the annular volute (5) is circular, and the annular volute (5) is tangentially connected to the outlet pipe (6).

Technical Field

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

Background

Hemolysis and thrombosis are symptoms that often occur during clinical use of blood pumps. The shear stress and the flowing time of the red blood cells in the flow field of the blood pump are main parameters influencing hemolysis, and the vortex region and the stagnation region near the wall surface in the flow field are easy to cause the activation of blood platelets, thereby forming thrombus. In order to improve the clinical application performance of the blood pump, the blood damage needs to be reduced by reducing the strength of the vortex and eliminating the flow dead zone, so that the blood compatibility of the blood pump is improved, and the complication and death rate of a patient are reduced. The existing extracorporeal circulation blood pump mainly comprises an axial flow type blood pump and a centrifugal type blood pump, wherein the axial flow type blood pump is long in axial direction, small in shaft neck and small in integral volume, so that the implantation performance is good, but the anti-hemolytic control difficulty is large in order to achieve standard blood flow and pressure supply and high in rotating speed; centrifugal blood pumps are large in shaft neck, short in axial direction and large in overall volume, but significant blood damage can also result due to the long time blood flows in the pump.

Disclosure of Invention

The invention aims to provide an extracorporeal circulation magnetic suspension mixed flow blood pump, which is used for reducing the risk of hemolysis and thrombus of the existing blood pump, can be matched with devices such as an artificial lung and the like to provide extracorporeal short and medium-term circulation support and reduce the complication and mortality of a patient.

The technical scheme adopted by the invention is as follows: an extracorporeal circulation magnetic suspension mixed flow blood pump, comprising: the transparent pump shell assembly is made of polyurethane and comprises an inlet pipe, a rotor impeller pump shell, an annular volute and an outlet pipe; a tongue-shaped volute tongue is arranged at the joint of the outlet pipe and the annular volute, and the radius of the volute tongue is 0.2-1.5 mm; the rotor impeller is positioned in the transparent pump shell assembly, side backflow slits are arranged on the side edges of the rotor impeller and the transparent pump shell assembly, bottom slits are arranged below the rotor impeller and the transparent pump shell assembly, the width of each side backflow slit is 0.5-1.5 mm, and the width of each bottom slit is 0.5-1.0 mm; the rotor impeller comprises rotor blades, a central guide cone, a permanent magnet sleeve and a permanent magnet assembly, wherein the permanent magnet assembly is arranged in the central guide cone and the permanent magnet sleeve; the permanent magnet assembly comprises an upper axial annular permanent magnet and a radial annular permanent magnet which are positioned in a permanent magnet sleeve, and a lower axial permanent magnet which is positioned in the central guide cone, wherein the upper axial annular permanent magnet and the lower axial 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 rotor blades are spiral and are distributed between the central guide cone and the permanent magnet sleeve at equal intervals in an alternating mode, and the number of the rotor blades is 4; rotor blade is provided with rotor blade leading edge in the incoming flow side, rotor blade is provided with rotor blade trailing edge at the afterbody, rotor blade leading edge and rotor blade trailing edge are handled through the radius to reduce the scraping effect to blood, reduce blood damage.

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 permanent magnet sleeve is the toper, the radius 2 to 3 millimeters of the inboard bottom of permanent magnet sleeve, the below tangential direction of permanent magnet sleeve is the horizontal direction, the radius 0.2 to 1 millimeter of the outside bottom of permanent magnet sleeve.

Further, the shape of the water-cut-off section of the annular volute is circular, and the annular volute is tangentially connected with the outlet pipe.

The invention has the beneficial effects that: compared with the traditional semi-open impeller and the open impeller, the extracorporeal circulation magnetic suspension mixed flow blood pump provided by the invention adopts the rotor impeller comprising the permanent magnet sleeve, so that the shearing stress at the blade top gap can be effectively reduced, and the hemolysis condition can be relieved; the permanent magnet assembly is arranged in the central guide cone and the permanent magnet sleeve to realize the suspension design of the rotor impeller, so that the defects of bearing friction loss, blood pollution and thrombus formation caused by fixing the axial and radial positions of the rotor impeller by a mechanical bearing in the traditional blood pump design can be effectively overcome, the blood flow rate is increased by arranging a smaller side backflow slit and a smaller bottom slit, the flushing effect is improved, the risk of forming thrombus is reduced, the service life of the blood pump is effectively prolonged, and the survival rate of a patient is improved; the adopted permanent magnet assemblies arranged in the central guide cone and the permanent magnet sleeve are closer to an electromagnetic control system positioned outside the transparent pump shell assembly, thereby being more beneficial to the control of the electromagnetic control system on the rotor impeller and being beneficial to the running stability of the blood pump.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

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

FIG. 3 is a bottom view of the apparatus of the present invention;

FIG. 4 is a cross-sectional view of the apparatus of the present invention;

FIG. 5 is a front view of a rotor blade and a center cone of the present invention;

FIG. 6 is a top view of a rotor blade and a center cone of the present invention;

FIG. 7 is a schematic view of a permanent magnet sleeve according to the present invention;

FIG. 8 is a schematic view of the internal flow of a mixed-flow blood pump according to the present invention;

FIG. 9 is an enlarged view of a portion I of FIG. 1;

wherein, 1: a transparent pump housing assembly; 2: a rotor impeller; 3: an inlet pipe; 4: a rotor impeller pump housing; 5: an annular volute; 6: an outlet pipe; 7: a volute tongue; 8: a side reflow slit; 9: a bottom slit; 10: a rotor blade; 11: a central guide cone; 12: a permanent magnet sleeve; 13: a permanent magnet assembly; 14: an upper axial annular permanent magnet; 15: a radial annular permanent magnet; 16: a lower axial permanent magnet; 17: a rotor blade leading edge; 18: 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 to 3, an extracorporeal circulation magnetic suspension mixed flow blood pump comprises: a transparent pump housing assembly 1 and a rotor impeller 2; the transparent pump shell assembly 1 is made of polyurethane so as to improve the biocompatibility of the blood pump; the transparent pump shell assembly 1 comprises an inlet pipe 3, a rotor impeller pump shell 4, an annular volute 5 and an outlet pipe 6, wherein a tongue-shaped volute tongue 7 is arranged at the joint of the outlet pipe 6 and the annular volute 5, and the radius of the volute tongue 7 is 0.2-1.5 mm; 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 side edge backflow slits 8, bottom slits 9 are arranged below the rotor impeller 2 and the transparent pump shell assembly 1, the width of each side edge backflow slit 8 is 0.5-1.5 mm, and the width of each bottom slit 9 is 0.5-1.0 mm, so that hemolysis caused by vortex leakage of blade tip gaps is avoided, the occurrence of thrombus is inhibited, meanwhile, effective flushing is provided for the inner surface of the transparent pump shell assembly 1 and the surface of the rotor impeller 2, the formation of a flow dead zone is prevented, and complications and death rate of patients are reduced; the rotor impeller 2 comprises rotor blades 10, a central guide cone 11, a permanent magnet sleeve 12 and a permanent magnet assembly 13, wherein the permanent magnet assembly 13 is arranged in the central guide cone 11 and the permanent magnet sleeve 12, the distance between the permanent magnet assembly 13 and an electromagnetic control system outside the blood pump can be effectively reduced, the electromagnetic control system can conveniently control the rotor impeller 2, and the safe and stable operation of the blood pump is facilitated.

As shown in fig. 4, the permanent magnet assembly 13 includes an upper axial annular permanent magnet 14 and a radial annular permanent magnet 15 located in the permanent magnet sleeve 12, and a lower axial permanent magnet 16 located in the central guide cone 11, wherein the upper axial annular permanent magnet 14 and the lower axial permanent magnet 16 are used for the axial positioning of the rotor wheel 2, and the radial annular permanent magnet 15 is used for the radial positioning of the rotor wheel 2. As shown in fig. 5, 6 and 7, the rotor blades 10 are spiral and have 4 pieces, and are alternately and equally spaced between the central guide cone 11 and the permanent magnet sleeve 12; the rotor blade 10 is provided with a rotor blade leading edge 17 on the incoming flow side, the rotor blade 10 is provided with a rotor blade trailing edge 18 on the tail portion, and the rotor blade leading edge 17 and the rotor blade trailing edge 18 are subjected to rounding treatment so as to reduce the scraping effect 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.

The permanent magnet sleeve 12 is conical, the radius of the bottom of the inner side of the permanent magnet sleeve 12 is 2-3 mm, the tangential direction below the permanent magnet sleeve 12 is horizontal, and the radius of the bottom of the outer side of the permanent magnet sleeve 12 is 0.2-1 mm, so that the resistance of the blood rotating and flowing in the annular volute 5 can be reduced, and the blood flow flowing into the side backflow slit 8 can be controlled conveniently.

The shape of the water-break section of the annular volute 5 is circular, and the annular volute 5 is tangentially connected with the outlet pipe 6 so as to reduce flow separation and reduce the static interference effect of the rotor blades and the rotor impeller pump shell.

In particular, as shown in fig. 8 and 9, in clinical application of the blood pump, blood flows into the blood pump through the inlet pipe 3, then enters the rotor impeller 2 to be accelerated and pressurized, then flows into the annular volute 5 to be decelerated and pressurized, and finally flows out of the blood pump through the outlet pipe 6; after a small part of blood flows into the annular volute 5, the small part of blood is influenced by the low pressure at the inlet of the rotor impeller 2 and the high pressure of the annular volute 5, upward backflow is generated in the side backflow slit 8, the backflow effectively washes the side backflow slit 8, the risk of thrombus at the position is reduced, the flow turning part of the side backflow slit 8 adopts a rounding design, the flow separation is reduced, and the blood compatibility in the side backflow slit 8 is ensured; in addition, a small part of blood is influenced by the rotation of the rotor impeller 2 and the pressure distribution in the annular volute 5 in the bottom slit 9, when the rotor impeller 2 rotates, a layer of blood directly contacted with the central guide cone 11 rotates along with the rotation, because the blood has viscosity, the blood on the upper layer of the bottom slit 9 is mainly influenced by centrifugal force and flows to the annular volute 5, the blood on the lower layer of the bottom slit 9 is influenced by the outflow of the blood on the upper layer, compensation movement is generated along with the blood, the blood flows from the annular volute 5 to the center direction of the bottom slit 9, the pressure distribution in the annular volute 5 also influences the flow of the bottom slit 9, and the flow forms of the upper layer and the lower layer of the bottom slit 9 are unchanged.

The first embodiment is as follows: stable cycle regime

Under a clinical stable circulation working condition, blood flows into the blood pump through the inlet pipe 3 and then enters the rotor impeller 2, the rotation of the rotor impeller 2 is controlled by an electromagnetic system outside the pump, wherein the upper axial annular permanent magnet 14 and the lower axial permanent magnet 16 are used for axially positioning the rotor impeller 2, the radial annular permanent magnet 15 is used for radially positioning the rotor impeller 2, the blood flows into the annular volute 5 after being accelerated and pressurized in the rotor impeller 2, is decelerated and pressurized in the annular volute 5 along the circumferential direction, and finally flows out of the blood pump through the outlet pipe 6; after a small part of blood flows into the annular volute 5, the small part of blood is influenced by the low pressure at the inlet of the rotor impeller 2 and the high pressure of the annular volute 5, upward backflow is generated in the side backflow slit 8, the backflow effectively washes the side backflow slit 8, the risk of thrombus at the position is reduced, the flow turning part of the side backflow slit 8 adopts a rounding design, the flow separation is reduced, and the blood compatibility in the side backflow slit 8 is ensured; in addition, a small part of blood is influenced by the rotation of the rotor impeller 2 and the pressure distribution in the annular volute 5 in the bottom slit 9, the upper surface of the bottom slit 9 is the bottom surface of the central guide cone 11, when the rotor impeller 2 rotates, a layer of blood in contact with the bottom surface of the central guide cone 11 rotates along with the rotation, the blood on the upper layer of the bottom slit 9 is mainly influenced by the centrifugal force due to the viscosity of the blood and flows to the annular volute 5, and the blood on the lower layer of the bottom slit 9 is influenced by the outflow of the blood on the upper layer and generates compensation movement along with the blood, so that the annular volute 5 flows to the center direction of the bottom slit 9.

Example two: machine removal state

In a machine withdrawal state, the extracorporeal circulation magnetic suspension mixed flow blood pump maintains the operation process in the first embodiment, gradually reduces the rotating speed of the rotor impeller 2 by monitoring the 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.