CN112807564B - Minimally invasive intervention type artificial heart axial flow blood pump - Google Patents

Minimally invasive intervention type artificial heart axial flow blood pump Download PDF

Info

Publication number
CN112807564B
CN112807564B CN202110109123.9A CN202110109123A CN112807564B CN 112807564 B CN112807564 B CN 112807564B CN 202110109123 A CN202110109123 A CN 202110109123A CN 112807564 B CN112807564 B CN 112807564B
Authority
CN
China
Prior art keywords
rotor
blood pump
rear guide
hub
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110109123.9A
Other languages
Chinese (zh)
Other versions
CN112807564A (en
Inventor
张锡文
吴啸
陈成瀚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsinghua University
Original Assignee
Tsinghua University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tsinghua University filed Critical Tsinghua University
Priority to CN202110109123.9A priority Critical patent/CN112807564B/en
Publication of CN112807564A publication Critical patent/CN112807564A/en
Application granted granted Critical
Publication of CN112807564B publication Critical patent/CN112807564B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/04—General characteristics of the apparatus implanted

Abstract

A minimally invasive intervention type artificial heart axial flow blood pump is used for assisting the blood circulation of a failing heart. The blood pump comprises a preposed conduit, a sleeve, a pump body and a micro motor, wherein the pump body and the micro motor are arranged in the sleeve; the pump body comprises a rotor hub, rotor blades, a rear guide vane hub and rear guide vane blades. The blood pump is mainly characterized in that a gradually-changed inner diameter is adopted, the minimum sectional area of the gradually-changed inner diameter is the same as the sectional area of a flow field area in the middle of a rotor, and a rotor hub is connected with a back guide impeller hub through a toothed sealing structure. The invention effectively reduces the energy loss caused by the change of the sectional area of the flow field area under the condition of ensuring that the sectional area of the flow field of the rotor area is basically unchanged, thereby improving the working efficiency of the blood pump. Meanwhile, the invasion of blood cells in the gap area is avoided, and the problem that the blood cells in the gap area of the rotor hub and the rear guide impeller hub of the existing minimally invasive intervention type axial flow blood pump are greatly damaged is solved, so that the reliability of the blood pump is obviously enhanced.

Description

Minimally invasive intervention type artificial heart axial flow blood pump
Technical Field
The invention relates to a minimally invasive intervention type artificial heart axial flow blood pump which can be used for assisting the blood circulation of a failing heart and belongs to the technical field of biomedical engineering.
Background
An implanted artificial heart blood pump is one of effective ways for treating end-stage heart failure, but the existing artificial heart blood pumps applied clinically are installed by opening the chest, so that the operation difficulty is high, and the wound area is large; the minimally invasive technique is adopted to intervene the miniature axial flow blood pump from the femoral artery, a safer and more effective technical means is provided, the preposed catheter is downwards extended to the left ventricle from the aorta, then the catheter passes through the artery valve, the blood flow is lifted by the pump to increase the pressure and flow to enter the aortic arch, thereby reducing the heart load and providing the blood auxiliary flow for the whole body. However, the minimally invasive interventional axial blood pump has a small size, so that the flow velocity is high, and further high energy loss is easily caused, mainly expressed by loss caused by sectional area change at an inlet of the sleeve, loss of a rotor and a rear guide vane area and loss caused by disturbance at an outlet. On the other hand, the minimally invasive interventional axial blood pump has the characteristics of small volume, large flow speed and large energy loss, so that the requirement of human body circulation can be met only by achieving higher rotating speed (20000 + 30000rpm), and the damage of blood cells in the gap area of the rotor hub and the rear guide impeller hub can be increased.
Disclosure of Invention
The invention aims to provide a minimally invasive intervention type artificial heart axial flow blood pump, which effectively reduces energy loss caused by the change of the sectional area of a flow field area under the condition of ensuring that the sectional area of the flow field of a rotor area is basically unchanged, and further improves the working efficiency of the blood pump; meanwhile, the invasion of blood cells in the gap area is avoided, and the problem that the blood cells in the gap area of the rotor hub and the rear guide impeller hub of the existing minimally invasive intervention type axial flow blood pump are greatly damaged is solved, so that the reliability of the blood pump is enhanced, and the life safety of a patient is ensured.
The technical scheme of the invention is as follows: a minimally invasive intervention type artificial heart axial flow blood pump comprises a preposed catheter, a sleeve, a pump body and a micro motor, wherein the pump body and the micro motor are arranged in the sleeve; the pump body comprises a rotor and a rear guide vane, the rotor comprises a rotor hub and rotor blades, and the rear guide vane comprises a rear guide impeller hub and rear guide vane blades; the micro motor output shaft is connected with back stator and rotor, its characterized in that: the inlet of the sleeve is provided with a gradually changing inner diameter, the gradually changing inner diameter comprises a gradually reducing section and a gradually expanding section, the minimum sectional area of the gradually changing inner diameter is the same as the sectional area of the flow field area in the middle of the rotor, the change curve of the gradually reducing section and the change curve of the gradually expanding section are smooth integrally, and the derivative of the beginning and the ending is 0.
In the above technical solution, the energy loss in the tapering section is calculated by using FLUENT software when the sleeve inlet pressure is 10000Pa and the flow rate is 4L/min, and the tapering section variation curve obtained based on the optimization with the minimum energy loss is: 0.6468x2-0.1467x3-0.0258x4(ii) a The divergent section extends to the position of the rotor, and a divergent section change curve obtained based on the constant optimization of the cross section area of the flow field is as follows: y 1-0.2132x2+0.0441x3-0.0016x4；
In the above formula, x represents an axial coordinate, and x ═ 0 represents the position where the curve starts, in mm; y represents the reduction of the inner diameter in mm.
Further, the rotor hub and the rear guide impeller hub are connected through a tooth-shaped sealing structure.
Furthermore, the rotor hub, the rear guide vane hub, the rotor blades and the rear guide vane blades adopt an integrated streamline structure; the outflow port is of a streamline self-adaptive structure.
The invention is also characterized in that: the output shaft of the micro motor is connected with the rear guide vane and the rotor in a mode that the output shaft of the micro motor penetrates through the rear guide vane and is connected with the rotor, and the rotor is supported by one side of the output shaft of the micro motor.
Compared with the prior art, the invention has the following advantages and prominent technical effects: firstly, the inlet of the sleeve is designed with a gradually-changed inner diameter, so that the energy loss caused by the sectional area can be effectively reduced, and the working efficiency of the blood pump is finally improved by 30 percent; meanwhile, the rotor can be prevented from being separated from the sleeve when extreme conditions occur, and the life safety of a patient is further ensured; a toothed sealing structure is arranged between the rotor hub and the rear guide impeller hub, so that the lubrication effect can be realized, the inflow and the damage of blood cells can be prevented, and the reliability of the blood pump is obviously enhanced; the rotor hub, the rear guide vane hub, the rotor blades and the rear guide vane blades are all in an integrated streamline design, so that vortexes generated in the rear guide vane region can be avoided; and fourthly, the streamline adaptive design of the outflow port can effectively reduce the resistance and disturbance when the blood flows out, and further improve the mechanical efficiency of the blood pump.
Drawings
Fig. 1 is a schematic structural diagram of a minimally invasive interventional artificial heart axial flow blood pump provided by the invention.
Fig. 2 is a structural view of a rotor portion.
FIG. 3 is a block diagram of the aft guide vane section.
FIG. 4 is a schematic view of the tooth seal arrangement existing between the rotor hub and the back guide vane hub.
FIG. 5 is a tapered section curve obtained by optimization under the conditions of sleeve inlet pressure 10000Pa and flow 4L/min.
FIG. 6 is a diverging curve optimized under the conditions of sleeve inlet pressure 10000Pa and flow 4L/min.
In the figure: 1-a front catheter; 2-a sleeve; 3-a micro motor; 4-a rotor hub; 5-rotor blades; 6-rear guide vane wheel hub; 7-rear guide vane blade; 8-percutaneous lead; 9-output shaft of micro motor; 10-an outflow port; 11-a tapered inner diameter; 12-a toothed structure; 13-a tapered section; 14-divergent section.
Detailed Description
The details of the structure, principles and operation of the present invention are described in detail below with reference to the accompanying drawings and examples.
As shown in figure 1, the minimally invasive interventional artificial heart axial flow blood pump provided by the invention comprises a preposed catheter 1, a sleeve 2, a pump body arranged in the sleeve and a micro motor 3, wherein the micro motor 3 is connected with the sleeve 2; the pump body comprises a rotor positioned in the sleeve and a rear guide vane fixed in the sleeve, wherein the rotor comprises a rotor hub 4 and rotor blades 5; the rear guide vane comprises a rear guide vane hub 6 and a rear guide vane blade 7. The micro motor is powered by a percutaneous lead 8, a micro motor output shaft 9 penetrates through the rear guide vane and is connected with the rotor, the rotor is supported by the single side of the micro motor output shaft, and the micro motor output shaft drives the rotor to rotate, so that blood is driven to be sucked from the preposed catheter 1 and then flows out of an outflow port 10 at the rear end of the sleeve.
The inlet of the blood pump sleeve is designed with a gradually-changed inner diameter 11 which comprises a tapered section 13 and a gradually-expanded section 14, so that the flow loss caused by reduction of the flow cross-sectional area can be reduced, and the reliability of the blood pump under extreme conditions can be improved. Compared with the traditional blood pump driven by a magnetic conductive material in a rotor and an electromagnetic coil outside a sleeve, the blood pump directly driven by a micro motor improves the output efficiency of the blood pump, has better stability and reduces the difficulty of installation and processing. The streamline adaptive structural design of the outflow port 10 can effectively reduce the resistance and disturbance when blood flows out, and further improve the mechanical efficiency of the blood pump.
As shown in fig. 1 and 4, a tooth-shaped sealing structure 12 is arranged between the rotor hub 4 and the back guide impeller hub 6, so that the lubrication effect is achieved, the damage of blood cells is avoided, and the reliability of the blood pump is remarkably enhanced.
As shown in fig. 2 and 3, the rotor hub 4, the rear guide vane hub 6, the rotor blades 5 and the rear guide vane blades 7 of the blood pump all adopt an integrated streamline design, so that the resistance and disturbance of blood flowing through the rotor and the rear guide vanes can be effectively reduced, and the mechanical efficiency of the blood pump is improved.
Fig. 5 and fig. 6 respectively show a convergent section curve and a divergent section curve obtained by optimization under the conditions of pressure at the inlet of the sleeve being 10000Pa and flow rate being 4L/min, wherein the convergent section curve and the divergent section curve satisfy the following conditions:
the minimum sectional area is the same as the sectional area of the flow field area in the middle of the rotor;
secondly, the curve is smooth as a whole, and the derivative at the beginning and the end is 0;
thirdly, setting sleeve inlet pressure 10000Pa and flow 4L/min by using FLUENT simulation, and finally obtaining a curve y of the reducing section which is 0.6468x based on the minimum optimization curve of the overall energy loss of the reducing section2-0.1467x3-0.0258x4. The gradual expansion section curve is optimized based on the constant of the flow field sectional area, namely the inner diameter of the sleeve is gradually increased along with the increase of the diameter of the rotor hub, the flow field sectional area is ensured to be basically constant, the energy loss caused by the change of the sectional area is avoided, and the gradual expansion section curve y is finally obtained as 1-0.2132x2+0.0441x3-0.0016x4(ii) a In the formula, x represents an axial coordinate, and x ═ 0 represents the position where the curve starts, and the unit is mm; y represents the reduction of the inner diameter in mm.
The gradual change internal diameter of sleeve entrance design can effectively reduce the energy loss because of the sectional area brings, and the streamline self-adaptation structure of the outflowing port can further promote the work efficiency of the blood pump, can improve 30% finally; therefore, only the rotating speed is set to 20000-30000 r/min, the flow rate not less than 4L/min and the pressure rise not less than 80-100 mmHg can be generated, and the blood is driven to circularly flow. Meanwhile, due to the reduction of the rotating speed and the existence of the toothed sealing structure between the rotor hub and the rear guide impeller hub, the damage of the blood pump to blood cells can be further reduced, and the reliability of the blood pump is obviously enhanced.

Claims (4)

1. A minimally invasive intervention type artificial heart axial flow blood pump comprises a preposed catheter (1), a sleeve (2), a pump body and a micro motor (3), wherein the pump body and the micro motor (3) are arranged in the sleeve, the micro motor is fixed on the sleeve, and a flow outlet (10) is formed in the sleeve; the pump body comprises a rotor and a rear guide vane, the rotor comprises a rotor hub (4) and rotor blades (5), and the rear guide vane comprises a rear guide impeller hub (6) and rear guide vane blades (7); the micro motor output shaft (9) passes the back stator and is connected with the rotor, its characterized in that: a gradual change inner diameter (11) is arranged at the inlet of the sleeve, the gradual change inner diameter comprises a gradual change section (13) and a gradual change section (14), the minimum sectional area of the gradual change inner diameter is the same as the sectional area of a flow field area in the middle of the rotor, the gradual change curve and the gradual change curve of the gradual change section are smooth integrally, and the derivatives at the beginning and the end are 0; the rotor hub and the rear guide impeller hub are connected through a tooth-shaped sealing structure (12); the outflow port (10) adopts a streamline self-adaptive structure; the blood pump enters a human body from a femoral artery and is inserted between a left ventricle and an aorta.
2. The minimally invasive interventional artificial heart axial blood pump of claim 1, wherein: the change curve of the tapered section is obtained by calculating the energy loss in the tapered section at the sleeve inlet pressure of 10000Pa and the flow rate of 4L/min by using FLUENT software, and optimizing the change curve of the tapered section based on the minimum energy loss as follows: 0.6468x2-0.1467x3-0.0258x4(ii) a The divergent section extends to the position of the rotor, and a divergent section change curve obtained based on the constant optimization of the flow field sectional area is as follows: y 1-0.2132x2+0.0441x3-0.0016x4；
In the above formula, x represents an axial coordinate, and x ═ 0 represents the position where the curve starts, in mm; y represents the reduction of the inner diameter in mm.
3. The minimally invasive interventional artificial heart axial blood pump of claim 1, wherein: the rotor hub, the rear guide vane hub, the rotor blades and the rear guide vane blades are of an integrated streamline structure.
4. The minimally invasive interventional artificial heart axial blood pump of claim 1, wherein: the micro motor output shaft (9) penetrates through the rear guide vane and is connected with the rotor, and the rotor is supported by the output shaft of the micro motor on one side.
CN202110109123.9A 2021-01-27 2021-01-27 Minimally invasive intervention type artificial heart axial flow blood pump Active CN112807564B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110109123.9A CN112807564B (en) 2021-01-27 2021-01-27 Minimally invasive intervention type artificial heart axial flow blood pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110109123.9A CN112807564B (en) 2021-01-27 2021-01-27 Minimally invasive intervention type artificial heart axial flow blood pump

Publications (2)

Publication Number Publication Date
CN112807564A CN112807564A (en) 2021-05-18
CN112807564B true CN112807564B (en) 2022-03-22

Family

ID=75859630

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110109123.9A Active CN112807564B (en) 2021-01-27 2021-01-27 Minimally invasive intervention type artificial heart axial flow blood pump

Country Status (1)

Country Link
CN (1) CN112807564B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115591105B (en) * 2021-07-07 2023-08-15 上海焕擎医疗科技有限公司 Impeller of heart auxiliary device and heart auxiliary device
CN113769260A (en) * 2021-09-16 2021-12-10 苏州心岭迈德医疗科技有限公司 Catheter pump, auxiliary blood pumping system and control method and device of catheter pump
CN114768085A (en) * 2022-03-21 2022-07-22 深圳核心医疗科技有限公司 Blood pump
CN114699596B (en) * 2022-03-21 2023-05-23 河海大学 Co-directional differential three-stage pressure regulating infusion pump with multiple molded line flow channels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6186665B1 (en) * 1999-01-26 2001-02-13 Nimbus, Inc. Motor rotor bearing assembly for a blood pump
EP1402907A1 (en) * 2002-09-30 2004-03-31 Terumo Kabushiki Kaisha Blood pump system
CN103635210A (en) * 2011-05-05 2014-03-12 柏林心脏有限公司 Blood pump
CN105636619A (en) * 2013-08-14 2016-06-01 哈特威尔公司 Impeller for axial flow pump
CN108778358A (en) * 2016-01-06 2018-11-09 毕瓦克公司 Heart pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101401981B (en) * 2008-11-14 2010-09-01 清华大学 Implanted miniature streamlined shaft bloodshed pump
US8535212B2 (en) * 2011-03-30 2013-09-17 Jarvik Robert Centrifugal blood pumps with reverse flow washout
CN103977464B (en) * 2014-06-06 2016-08-17 清华大学 A kind of implantable micro-axial blood pump of exit gradual change flow region
ES2839081T3 (en) * 2015-03-18 2021-07-05 Abiomed Europe Gmbh Blood pump
GB2555435A (en) * 2016-10-27 2018-05-02 Calon Cardio Tech Ltd Cardiac pump
CN111888552B (en) * 2020-07-06 2021-05-18 河海大学 Single-axis variable-speed two-stage asynchronous heart pump with difference iteration curve flow channel and use method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6186665B1 (en) * 1999-01-26 2001-02-13 Nimbus, Inc. Motor rotor bearing assembly for a blood pump
EP1402907A1 (en) * 2002-09-30 2004-03-31 Terumo Kabushiki Kaisha Blood pump system
CN103635210A (en) * 2011-05-05 2014-03-12 柏林心脏有限公司 Blood pump
CN105636619A (en) * 2013-08-14 2016-06-01 哈特威尔公司 Impeller for axial flow pump
CN108778358A (en) * 2016-01-06 2018-11-09 毕瓦克公司 Heart pump

Also Published As

Publication number Publication date
CN112807564A (en) 2021-05-18

Similar Documents

Publication Publication Date Title
CN112807564B (en) Minimally invasive intervention type artificial heart axial flow blood pump
US10434232B2 (en) Blood pump with separate mixed-flow and axial-flow impeller stages and multi-stage stators
CN103877630B (en) Axial magnetic unload-type axial-flow pump heart-assist device
CN106902404B (en) Percutaneous auxiliary blood pumping device
CN104069555B (en) A kind of heart assistance axial blood pump
CN109821084B (en) It is a kind of that shaftless heart pump can plant based on flow passage gradual change
CN116327158A (en) Blood flow velocity measuring system
CN104274873A (en) Miniature apex cordis axial-flow blood pump and implanting method thereof
CN104208764B (en) A kind of magnetic liquid suspension formula axial-flow pump heart-assist device
CN204050452U (en) A kind of heart assistance axial blood pump
CN101401981A (en) Implanted miniature streamlined shaft bloodshed pump
CN104162192B (en) A kind of liquid magnetic suspension shaft streaming blood pump
CN203842087U (en) Axial magnetic force uninstalling type axial flow pump heart auxiliary device
CN105498002A (en) Blood pumping impeller
CN104162191B (en) A kind of liquid magnetic suspension shaft streaming assistant blood pump for heart
WO2017196271A1 (en) Internal axial flow blood pump with passive magnets and hydrodynamic radial bearing
CN215309683U (en) Heart auxiliary device in blood vessel
CN205243867U (en) Vortex pump
CN113153804B (en) Blood pumping impeller and ventricular assist device
CN215780980U (en) Pump head structure for magnetic suspension blood pump
CN114432588B (en) Aortic puncture type axial flow blood pump with edge folding blade structure
CN115634368A (en) Pump head structure for magnetic suspension blood pump
CN204106669U (en) A kind of liquid magnetic suspension shaft streaming assistant blood pump for heart
CN114344701A (en) Ventricular assist device for right heart of child
CN113648535A (en) Nested multistage parallel blood pump capable of realizing large-flow pulsation output

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant