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    • 1. 发明授权
    • Shape memory alloy articles with improved fatigue performance and methods therefor
    • 具有改善疲劳性能的形状记忆合金制品及其方法
    • US07811393B2
    • 2010-10-12
    • US11557274
    • 2006-11-07
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • A61F2/06C22C19/03
    • A61F2/82A61B2017/00867A61C2201/007A61L31/022A61L31/121A61L31/14A61L2400/16C22F1/006
    • Articles made of shape memory alloys having improved fatigue performance and to methods of treating articles formed from shape memory alloy materials by pre-straining the articles (or desired portions of the articles) in a controlled manner so that the resultant articles exhibit improved fatigue performance. The shape memory articles are preferably medical devices, more preferably implantable medical devices. They are most preferably devices of nitinol shape memory alloy, most particularly that is superelastic at normal body temperature. The pre-straining method of the present invention as performed on such articles includes the controlled introduction of non-recoverable tensile strains greater than about 0.20% at the surface of a desired portion of a shape memory alloy article. Controlled pre-straining operations are performed on the shape-set nitinol metal to achieve non-recoverable tensile strain greater than about 0.20% at or near the surface of selected regions in the nitinol metal article. The pre-straining operations result in a significant increase in fatigue life of the selectively treated regions and an overall improvement in the fatigue performance of the device.
    • 由具有改善的疲劳性能的形状记忆合金制成的制品以及通过以受控的方式预制品(或制品的所需部分)来处理由形状记忆合金材料形成的制品的方法,使得所得制品表现出改进的疲劳性能。 形状记忆物品优选是医疗装置,更优选可植入医疗装置。 它们最优选为镍钛诺形状记忆合金的装置,最特别的是在正常体温下是超弹性的。 对这种制品进行的本发明的预应变方法包括在形状记忆合金制品的期望部分的表面处控制引入大于约0.20%的不可恢复的拉伸应变。 在形状组成的镍钛诺金属上进行受控的预应变操作,以在镍钛诺金属制品的选定区域的表面处或附近实现大于约0.20%的不可恢复拉伸应变。 预应变操作导致选择性处理区域的疲劳寿命显着增加,并且整体提高了设备​​的疲劳性能。
    • 2. 发明授权
    • Shape memory alloy articles with improved fatigue performance and methods therefor
    • 具有改善疲劳性能的形状记忆合金制品及其方法
    • US07789979B2
    • 2010-09-07
    • US10428872
    • 2003-05-02
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • C23F1/10
    • A61F2/82A61B2017/00867A61C2201/007A61L31/022A61L31/121A61L31/14A61L2400/16C22F1/006
    • Articles made of shape memory alloys having improved fatigue performance and to methods of treating articles formed from shape memory alloy materials by pre-straining the articles (or desired portions of the articles) in a controlled manner so that the resultant articles exhibit improved fatigue performance. The shape memory articles are preferably medical devices, more preferably implantable medical devices. They are most preferably devices of nitinol shape memory alloy, most particularly that is superelastic at normal body temperature. The pre-straining method of the present invention as performed on such articles includes the controlled introduction of non-recoverable tensile strains greater than about 0.20% at the surface of a desired portion of a shape memory alloy article. Controlled pre-straining operations are performed on the shape-set nitinol metal to achieve nonrecoverable tensile strain greater than about 0.20% at or near the surface of selected regions in the nitinol metal article. The pre-straining operations result in a significant increase in fatigue life of the selectively treated regions and an overall improvement in the fatigue performance of the device.
    • 由具有改善的疲劳性能的形状记忆合金制成的制品以及通过以受控的方式预制品(或制品的所需部分)来处理由形状记忆合金材料形成的制品的方法,使得所得制品表现出改进的疲劳性能。 形状记忆物品优选是医疗装置,更优选可植入医疗装置。 它们最优选为镍钛诺形状记忆合金的装置,最特别的是在正常体温下是超弹性的。 对这种制品进行的本发明的预应变方法包括在形状记忆合金制品的期望部分的表面处控制引入大于约0.20%的不可恢复的拉伸应变。 在形状固定的镍钛诺金属上进行受控的预应变操作,以在镍钛诺金属制品的选定区域的表面处或附近实现大于约0.20%的不可恢复的拉伸应变。 预应变操作导致选择性处理区域的疲劳寿命显着增加,并且整体提高了设备​​的疲劳性能。
    • 5. 发明授权
    • Shape memory alloy articles with improved fatigue performance and methods therefor
    • 具有改善疲劳性能的形状记忆合金制品及其方法
    • US08216396B2
    • 2012-07-10
    • US12873191
    • 2010-08-31
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • Bret A. DooleyChristopher C. LasleyMichael R. MitchellRobert R. SteeleEric M. Tittelbaugh
    • A61F2/82C22C19/03
    • A61F2/82A61B2017/00867A61C2201/007A61L31/022A61L31/121A61L31/14A61L2400/16C22F1/006
    • Articles made of shape memory alloys having improved fatigue performance and to methods of treating articles formed from shape memory alloy materials by pre-straining the articles (or desired portions of the articles) in a controlled manner so that the resultant articles exhibit improved fatigue performance. The shape memory articles are preferably medical devices, more preferably implantable medical devices. They are most preferably devices of nitinol shape memory alloy, most particularly that is superelastic at normal body temperature. The pre-straining method of the present invention as performed on such articles includes the controlled introduction of non-recoverable tensile strains greater than about 0.20% at the surface of a desired portion of a shape memory alloy article. Controlled pre-straining operations are performed on the shape-set nitinol metal to achieve non-recoverable tensile strain greater than about 0.20% at or near the surface of selected regions in the nitinol metal article. The pre-straining operations result in a significant increase in fatigue life of the selectively treated regions and an overall improvement in the fatigue performance of the device.
    • 由具有改善的疲劳性能的形状记忆合金制成的制品以及通过以受控的方式预制品(或制品的所需部分)来处理由形状记忆合金材料形成的制品的方法,使得所得制品表现出改进的疲劳性能。 形状记忆物品优选是医疗装置,更优选可植入医疗装置。 它们最优选为镍钛诺形状记忆合金的装置,最特别的是在正常体温下是超弹性的。 对这种制品进行的本发明的预应变方法包括在形状记忆合金制品的期望部分的表面处控制引入大于约0.20%的不可恢复的拉伸应变。 在形状组成的镍钛诺金属上进行受控的预应变操作,以在镍钛诺金属制品的选定区域的表面处或附近实现大于约0.20%的不可恢复拉伸应变。 预应变操作导致选择性处理区域的疲劳寿命显着增加,并且整体提高了设备​​的疲劳性能。
    • 10. 发明授权
    • Alternator regulator with variable rotor field frequency
    • 具有可变转子磁场频率的交流发电机调节器
    • US08330430B2
    • 2012-12-11
    • US12271365
    • 2008-11-14
    • Robert R. Steele, Jr.Jack D. HarmonMingshe Zhou
    • Robert R. Steele, Jr.Jack D. HarmonMingshe Zhou
    • H02P11/00H02P9/00
    • H02P9/305H02P9/48
    • An alternator comprises a regulator configured to control the electric current to a field coil. The regulator includes a field driver circuit, the field driver circuit configured to deliver the electric current to the field coil at a switching frequency. The regulator further includes a controller configured to vary the switching frequency of the field driver circuit between a plurality of different switching frequencies. The alternator further comprises a sensor configured to detect a predetermined alternator condition, and the controller is configured to adjust the switching frequency of the field driver circuit in response to the sensed predetermined condition such as, for example, a rotor speed, a pulse width from the field driver circuit, an efficiency of the alternator, a temperature within the alternator, a temperature outside of the alternator, or magnetic noise of the alternator.
    • 交流发电机包括被配置为控制到场线圈的电流的调节器。 调节器包括场驱动器电路,该场驱动器电路被配置为以切换频率将电流输送到励磁线圈。 调节器还包括控制器,其被配置为改变场驱动器电路在多个不同开关频率之间的开关频率。 交流发电机还包括被配置为检测预定交流发电机状态的传感器,并且控制器被配置为响应于感测的预定条件来调整励磁驱动器电路的开关频率,例如转子速度, 现场驱动器电路,交流发电机的效率,交流发电机内的温度,交流发电机外部的温度或交流发电机的磁性噪声。