CN105477706A - 双定子混合支承人工心脏泵 - Google Patents
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- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
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- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
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- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
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- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
-
- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/82—Magnetic bearings
- A61M60/822—Magnetic bearings specially adapted for being actively controlled
-
- 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
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/824—Hydrodynamic or fluid film bearings
-
- 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
-
- 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
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
- A61M2210/125—Heart
Abstract
本发明公开了双定子混合支承人工心脏泵,包括设于外定子内部的内定子,在内定子与外定子之间设有具有叶轮的转子,内定子设有径向轴承磁环,转子内设有与径向轴承磁环相互产生斥力的径向磁环,转子设有电机磁铁,电机磁铁与设于外定子的电磁驱动装置作用带动转子旋转,内定子的两端面各固设有用于导入或导出血液的导叶,本发明的有益效果是:采用双定子,转子在两定子之间的结构形式,实现动压支承和永磁支承的混合支承,减小了支承间隙,因为径向轴承磁铁间距离减小,可以使在采用相同体积的永磁体时径向悬浮力大,电机驱动力矩大,从而可以减小功耗和减小永磁体体积,减轻了重量,增强了可植入性和运转的可靠性,延长了人工心脏泵的使用寿命。
Description
技术领域
本发明涉及人工心脏泵,具体涉及双定子混合支承人工心脏泵。
背景技术
人工心脏经过几十年的发展历程,目前已发展到第三代,通过磁悬浮或者其他无接触支承为标志,替代机械轴承从而消除轴承处血流滞止区,达到消除血栓的目的。轴流式心脏泵一般结构是转子位于定子的里面,转子的周边是叶轮。为了节省电功率,径向大多采用永磁轴承悬浮,轴向大多采用电磁悬浮,可以控制悬浮间隙,使得转子始终处于全悬浮状态。由于转子的周边要有叶轮,使得径向磁悬浮轴承的定子与转子之间的实际悬浮间隙变大,实际间隙等于叶轮的高度与气隙之和。
对于磁悬浮支承技术而言,悬浮力与间隙的平方成反比,间隙变大,功耗必然增大,同时泵体积也较大。而植入式人工心脏的发展方向是体积小、重量轻和功耗小,这就要求磁轴承的设计上要有所突破,尽可能的简化结构,缩小尺寸。
发明内容
本发明的目的是为了提供一种能有效减小血泵体积和功耗、增强可植入性和运转可靠性的、能结合动压支承和永磁支承的新型双定子混合支承人工心脏泵。
为了达成上述目的,本发明采用如下技术方案:
双定子混合支承人工心脏泵,包括设于外定子内部的内定子,在内定子与外定子之间设有具有叶轮的转子,内定子设有径向轴承磁环,转子内设有与径向轴承磁环相互产生斥力的径向磁环,转子设有电机磁铁,电机磁铁与设于外定子的电磁驱动装置作用带动转子旋转,内定子的两端面各固设有用于导入或导出血液的导叶,内定子与外定子之间设置转子的结构,悬浮气隙减小;当电磁驱动装置驱动转子旋转时,由于叶轮作用,血液绝大部分通过外定子与转子之间的主流道由人工心脏泵进口流向出口,由于压力差的作用,有一部分血液会从转子与内定子之间的缝隙回流,在转子两端与前、后导叶之间有液膜轴承,转子由静止开始旋转时,转子的叶轮与前导叶或者后导叶接触,当转子转速升高时,转子与导叶之间血液产生的动压力将转子与前导叶或者后导叶脱离接触,形成液膜,从而形成动压支承,动压支承配合永磁支承实现人工心脏泵的五自由度混合悬浮支承。
进一步地,所述电磁驱动装置为设于外定子外的电机线圈。
进一步地,所述转子的两个端部各设有一个轴向液膜轴承。
进一步地,所述内定子与所述转子间隔设定的距离,转子与外定子间隔设定的距离。
进一步地,所述径向轴承磁环为圆环状。
进一步地,所述混合支撑人工心脏泵的结构对称设置。
进一步地,所述内定子呈圆柱状。
进一步地,所述转子与所述内定子之间的流道设有导流线,畅通了血液流道解决了由于血液滞止产生血栓问题。
本发明的工作原理是:当人工心脏泵工作时,电机线圈与电机磁铁作用,带动叶轮旋转,由于液膜轴承作用,转子高速运转时血膜产生的动压力能将转子轴向悬浮起来,该悬浮力与内定子和转子之间的径向斥力产生的侧向力以及人工心脏泵出口血液产生的反作用力实现平衡,即支承负载力由不需外加能量的径向轴承磁环与液膜轴承承担,混合支承可使得转子始终处于全悬浮状态,从而省略了外加能源,省掉了磁轴承控制导线及控制系统。由于悬浮间隙的减小不仅降低了永磁体的发热量,而且节省了能源,增加了血流的平稳性。同时由于没有接触,所以没有摩擦升温导致血栓的问题。由于转子与内定子之间的回流血液的流道设计有导流线,畅通了血液流道解决了由于血液滞止产生血栓问题。该人工心脏泵能够实现无机械接触运转没有磨损,使用寿命几乎可以无限延长。
公式(1)表明了悬浮力与悬浮间隙的关系:
式中s为悬浮间隙。
由公式(1)可知,s变小,悬浮力f增加。由于悬浮力的增大可以降低功耗和体积,这对于内置式人工心脏泵是最重要的指标之一。
本发明的有益效果是:
1)采用内、外双定子固定,转子在二者之间的结构形式,实现动压支承和永磁支承的混合全悬浮支承,增强了可植入性和运转的可靠性。
2)因为径向轴承磁环间距离(悬浮气隙)减小,可以使在采用相同体积的永磁体时径向悬浮力大,电机驱动力矩增大,从而可以减小功耗和减小永磁体体积。永磁体体积减小,重量就会减小,增强了可植入性。
附图说明
图1是本发明人工心脏泵的结构示意图;
其中:1.前导叶2.前径向轴承3.电机线圈4.电机磁铁5.后轴向液膜轴承6.后导叶7.后径向轴承8.转子9.内定子10.前轴向液膜轴承11.外定子。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整的描述。
双定子混合支承人工心脏泵,包括外定子11,外定子11的中部设有内定子9,内定子9的两端均设有永磁径向磁环,在内、外定子之间有转子8,转子8设有与内定子磁环一一对应的径向磁环,即图1中的前径向轴承2和后径向轴承7,转子8中有电机转子磁铁,在内定子9的另两端面各固设有用于导入或导出血液的导叶,即图1中的前导叶1和后导叶6。
所述电磁驱动装置为外定子外电机线圈3,电机线圈3为环形,与所述叶轮的电机转子环形磁铁4配合为驱动电机。当人工心脏泵工作时,电机线圈3与电机磁铁4作用,驱动叶轮旋转。
转子8的两个端部各设有一个轴向液膜轴承,即图1中的前轴向液膜轴承10和后轴向液膜轴承5。
转子8的两个端部各设有一个径向轴承,即图1中的前径向轴承2和后径向轴承7。
当人工心脏泵工作时,支承负载力由不需外加能量的径向轴承与轴向液膜轴承承担,混合支承可使得叶轮始终处于全悬浮状态,从而省略了外加能源,省掉了磁轴承控制导线及系统。不仅降低了永磁体(永磁磁环)的发热量,而且节省了能源,增加了血流的平稳性。同时由于没有接触,所以没有摩擦升温导致血栓的问题。
血液从人工心脏泵的左侧进入,由于转子8内、外侧均有流道,从转子8与内定子9之间的间隙导入血流,转子8高速运转时血膜产生的动压力能将叶轮轴向悬浮起来,该悬浮力与内定子9和转子8之间的径向斥力产生的侧向力以及人工心脏泵出口血液产生的反作用力实现平衡,即支承负载力由不需外加能量的径向轴承磁环与液膜轴承承担,混合支承可使得转子8始终处于全悬浮状态,从而省略了外加能源,省掉了磁轴承控制导线及控制系统,这样,人工心脏泵能够无机械接触运转没有磨损,使用寿命几乎可以无限延长。
中间的叶轮与内定子的间隙变小,由公式(1)可知:
式中,s为悬浮气隙。
s变小,悬浮力f大大增加,就可降低功耗,延长血泵的工作寿命。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (8)
1.双定子混合支承人工心脏泵,其特征在于,包括设于外定子内部的内定子,在内定子与外定子之间设有具有叶轮的转子,内定子设有径向轴承磁环,转子内设有与径向轴承磁环相互产生斥力的径向磁环,转子设有电机磁铁,电机磁铁与设于外定子的电磁驱动装置作用带动转子旋转,内定子的两端面各固设有用于导入或导出血液的导叶,内定子与外定子之间设置转子的结构,悬浮气隙减小。
2.如权利要求1所述的混合支承人工心脏泵,其特征在于,所述电磁驱动装置为设于外定子外的电机线圈。
3.如权利要求1或2所述的混合支承人工心脏泵,其特征在于,所述转子的两个端部各设有一个轴向液膜轴承。
4.如权利要求3所述的混合支承人工心脏泵,其特征在于,所述内定子与所述转子间隔设定的距离,转子与外定子间隔设定的距离。
5.如权利要求3所述的混合支承人工心脏泵,其特征在于,所述径向轴承磁环为圆环状。
6.如权利要求1或2所述的混合支承人工心脏泵,其特征在于,所述混合支承人工心脏泵的结构对称设置。
7.如权利要求1或2所述的混合支承人工心脏泵,其特征在于,所述内定子呈圆柱状。
8.如权利要求1或2所述的混合支承人工心脏泵,其特征在于,所述转子与所述内定子之间的流道设有导流线。
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