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1. 发明授权

US11493318B2 Calibrating a magnetic transmitter 有权
公开(公告)号：US11493318B2
公开(公告)日：2022-11-08
申请号：US17139520
申请日：2020-12-31
申请人： Northern Digital, Inc.
发明人： Mark Robert Schneider , Charles Robertson , Joseph Bruce Durfee
IPC分类号： G01R33/00 , G01B7/004 , G01C17/38 , G06F3/01 , G06F3/0346
摘要： A calibration device comprising: a plurality of magnetic sensors positioned at the calibration device, the plurality of magnetic sensors defining a space; a controller configured to be positioned in the space defined by the plurality of magnetic sensors, wherein the controller includes a magnetic transmitter; and one or more processors configured to: cause the magnetic transmitter to generate magnetic fields; receive signals from the plurality of magnetic sensors that are based on characteristics of the magnetic fields received at the plurality of magnetic sensors; calculate, based on the signals received from the plurality of magnetic sensors, positions and orientations of the plurality of magnetic sensors relative to a position and orientation of the magnetic transmitter; and determine whether the calculated positions and orientations of the plurality of magnetic sensors are within one or more threshold limits of known positions and orientations of the plurality of magnetic sensors.

2. 发明申请

US20220280060A1 Magnetic Position Measurement System with Interference Reduction 有权
公开(公告)号：US20220280060A1
公开(公告)日：2022-09-08
申请号：US17686112
申请日：2022-03-03
申请人： Northern Digital Inc.
发明人： Westley S. Ashe , William Petrow
IPC分类号： A61B5/06 , A61B34/20
摘要： An electromagnetic tracking (EMT) system is configured for determining a frequency for generating at least a portion of a magnetic field signal using a transmitter coil of a plurality of transmitter coils. The EMT system configures a time-division multiplexed (TDM) control signal configured to cause the transmitter coil to transmit bursts of the magnetic field signal at the frequency. The EMT system configures a filter for filtering the TDM control signal, the filter configured to shape each burst to reduce or eliminate a harmonic artifact of the bursts. The EMT system causes the transmitter coil to generate the shaped bursts of the magnetic field signal. The EMT system receives, from a sensor, a sensor signal that corresponds to the magnetic field signal, the sensor including the output response indicative of the location of the sensor relative to the transmitter.

3. 发明授权

US10779892B2 Tracking a cylindrical opening 有权
公开(公告)号：US10779892B2
公开(公告)日：2020-09-22
申请号：US16047112
申请日：2018-07-27
申请人： Northern Digital Inc.
发明人： Nikolai Mikuszeit , Christian Schilling , Olaf Zerres , Georg Brunner , Stefan R. Kirsch , Westley D. Ashe , Mark Robert Schneider , Vladimir F. Kogan
IPC分类号： A61B17/17 , A61B17/72 , A61B34/20 , G01D5/20 , A61L31/02 , A61B90/00 , A61B17/00
摘要： A system comprising: a sensor configured to be introduced into a clearance hole of a surgical implant, wherein the sensor is configured to be introduced in proximity to a generated magnetic field and cause distortion of the magnetic field; and one or more field measuring coils configured to: measure a characteristic of the magnetic field when the sensor is in proximity to the magnetic field; and provide, to a computing device, a signal representative of the measured characteristic of the magnetic field, wherein the computing device is configured to determine one or both of a position and an orientation of the sensor and the clearance hole based on the measured characteristic of the magnetic field.

4. 发明授权

US09031314B2 Establishing coordinate systems for measurement 有权
标题翻译：建立测量坐标系
公开(公告)号：US09031314B2
公开(公告)日：2015-05-12
申请号：US13099548
申请日：2011-05-03
申请人： Paul David Clausen , James Spere , Terry Harold Fisher
发明人： Paul David Clausen , James Spere , Terry Harold Fisher
IPC分类号： G06K9/00 , G06T7/00 , G01B11/25
CPC分类号： G06T7/0042 , G01B11/25 , G06T7/73 , G06T2207/30108
摘要： In one aspect, in general, a measurement system includes a projector for illuminating a pattern on a surface of the object, at least two imaging devices for obtaining images of a portion of an object, wherein at least some of the images include representations of one or more illuminated reference markers, an instrument for identifying a predetermined feature of the object, and a computing device for determining first position information associated with the illuminated reference markers represented in the images, determining second position information associated with the instrument, and based on the first position information and the second position information, assigning a predetermined coordinate system of the object to the object.
摘要翻译：一方面，通常，测量系统包括用于照射物体表面上的图案的投影仪，用于获得物体的一部分的图像的至少两个成像装置，其中至少一些图像包括一个或更多照明参考标记，用于识别对象的预定特征的仪器，以及用于确定与图像中表示的照亮参考标记相关联的第一位置信息的计算设备，确定与所述仪器相关联的第二位置信息，并且基于第一位置信息和第二位置信息，将对象的预定坐标系分配给对象。

5. 发明申请

US20140102167A1 FORCE PLATFORM 审中-公开
标题翻译：强制平台
公开(公告)号：US20140102167A1
公开(公告)日：2014-04-17
申请号：US13800894
申请日：2013-03-13
申请人： NORTHERN DIGITAL, INC.
发明人： David MacNeil , Melanie Scholz , Bob Bordignon
IPC分类号： G01L25/00 , G01B7/31
CPC分类号： G01L25/00 , G01B7/31 , Y10T29/49764
摘要： In one aspect, a force platform includes indicators at known locations with respect to applied forces used during the calibration of the force platform, the indicators being usable by a spatial measurement system to determine the location of the indicators in a coordinate system external to the force platform.
摘要翻译：在一个方面，力平台包括相对于在力平台校准期间使用的施加力的已知位置处的指示器，所述指示器可由空间测量系统使用以确定所述指示器在所述力外部的坐标系中的位置平台。

6. 发明授权

US08689801B2 Targeting orthopaedic device landmarks 有权
标题翻译：针对骨科设备地标
公开(公告)号：US08689801B2
公开(公告)日：2014-04-08
申请号：US13500420
申请日：2010-10-06
申请人： Nicholas S. Ritchey , Gene Edward Austin , Charles C. Heotis , Stefan R. Kirsch
发明人： Nicholas S. Ritchey , Gene Edward Austin , Charles C. Heotis , Stefan R. Kirsch
IPC分类号： A61B19/00
CPC分类号： A61B17/1725 , A61B17/1615 , A61B17/1707 , A61B17/72 , A61B34/20 , A61B2034/2051 , A61B2090/0811
摘要： Targeting sensors for use in targeting landmarks of orthopaedic devices. The sensors include a non-cylindrical mounting platform such as a printed circuit board and at least two mounted or printed sensor coils to provide a low profile sensor assembly which can be placed in a predetermined position and orientation on or in an orthopaedic device. The platform has a non-circular cross-section having an aspect ratio of greater than about 1.5:1. The non-circular cross-section of the platform enables the sensor to be placed in a known fixed position within the implant. The sensor coils may be partially or fully embedded in the platform.
摘要翻译：针对传感器，用于定位整形外科设备的界标。传感器包括诸如印刷电路板的非圆柱形安装平台和至少两个安装或印刷的传感器线圈，以提供可以放置在整形外科装置上或矫形装置中的预定位置和取向的低轮廓传感器组件。平台具有纵横比大于约1.5:1的非圆形横截面。平台的非圆形横截面使传感器能够置于植入物内的已知固定位置。传感器线圈可以部分地或完全地嵌入在平台中。

7. 发明申请

US20110224537A1 Multi-field Magnetic Tracking 有权
标题翻译：多场磁跟踪
公开(公告)号：US20110224537A1
公开(公告)日：2011-09-15
申请号：US13044720
申请日：2011-03-10
申请人： Georg Brunner
发明人： Georg Brunner
IPC分类号： A61B5/055 , G06F15/00
CPC分类号： A61B5/062
摘要： A magnetic tracking system includes a first set of magnetic field generators configured to produce a first magnetic field having a first shape within a three dimensional region and at least a second set of magnetic field generators configured to produce a second magnetic field having a second shape within the three dimensional region. The system also includes a computing device configured to compute a position of a sensor within the three dimensional region based on the first and second magnetic fields being detected by the sensor.
摘要翻译：磁跟踪系统包括第一组磁场发生器，其被配置为产生具有在三维区域内的第一形状的第一磁场和至少第二组磁场发生器，其被配置为产生具有第二形状的第二磁场三维地区。该系统还包括计算装置，其被配置为基于由传感器检测到的第一和第二磁场来计算三维区域内的传感器的位置。

8. 发明授权

US07469187B2 Eddy current detection and compensation 有权
标题翻译：涡流检测和补偿
公开(公告)号：US07469187B2
公开(公告)日：2008-12-23
申请号：US11332390
申请日：2006-01-13
申请人： John M. Nieminen , Stefan R. Kirsch
发明人： John M. Nieminen , Stefan R. Kirsch
IPC分类号： G01B5/28
CPC分类号： A61B34/20 , A61B5/06 , A61B5/062 , A61B2034/2051
摘要： A distortion compensation method includes determining an undisturbed phase for at least one of a first position indication signal and a second position indication signal. The method includes determining an undisturbed ratio that relates the amplitude of the first position indication signal at a first frequency to the amplitude of the second position indication signal at a second frequency. The method also includes determining a disturbed amplitude of the position indication signal and adjusting a position indication based on the disturbed amplitude and phase, the undisturbed amplitude ratio, and the undisturbed phase. The method further comprises determining a relationship between the eddy current phase of the first position indication signal and the second position indication signal.
摘要翻译：失真补偿方法包括：确定第一位置指示信号和第二位置指示信号中的至少一个的不受干扰的相位。该方法包括确定将第一频率处的第一位置指示信号的振幅与第二频率处的第二位置指示信号的振幅相关联的未扰动比。该方法还包括确定位置指示信号的干扰幅度，并且基于干扰的幅度和相位，未受干扰的振幅比和未受干扰的相位来调整位置指示。该方法还包括确定第一位置指示信号的涡流相位与第二位置指示信号之间的关系。

9. 发明授权

US07353125B2 Eddy current detection and compensation 有权
公开(公告)号：US07353125B2
公开(公告)日：2008-04-01
申请号：US11331518
申请日：2006-01-13
申请人： John M. Nieminen , Stefan R. Kirsch
发明人： John M. Nieminen , Stefan R. Kirsch
IPC分类号： G01R13/00
CPC分类号： A61B34/20 , A61B5/06 , A61B5/062 , A61B2034/2051
摘要： A distortion compensation method includes determining an undisturbed phase for at least one of a first position indication signal and a second position indication signal. The method includes determining an undisturbed ratio that relates the amplitude of the first position indication signal at a first frequency to the amplitude of the second position indication signal at a second frequency. The method also includes determining a disturbed amplitude of the position indication signal and adjusting a position indication based on the disturbed amplitude and phase, the undisturbed amplitude ratio, and the undisturbed phase. The method further comprises determining a relationship between the eddy current phase of the first position indication signal and the second position indication signal.

10. 发明授权

US11529193B2 Tracking a sensor that includes a ferrofluid 有权
公开(公告)号：US11529193B2
公开(公告)日：2022-12-20
申请号：US16047122
申请日：2018-07-27
申请人： Northern Digital Inc.
发明人： Nikolai Mikuszeit
IPC分类号： A61B34/20 , A61B90/00 , A61B5/06 , A61K49/00 , G01D5/20
摘要： A system comprising: one or more field generating coils configured to generate a magnetic field; a sensor comprising a shell that contains a ferrofluid, the sensor configured to be introduced in proximity to the magnetic field, wherein the ferrofluid causes distortion of the magnetic field when the ferrofluid is in proximity to the magnetic field; and one or more field measuring coils configured to: measure a characteristic of the magnetic field when the ferrofluid is in proximity to the magnetic field; and provide, to a computing device, a signal representative of the measured characteristic of the magnetic field, wherein the computing device is configured to determine one or both of a position and an orientation of the sensor based on the measured characteristic of the magnetic field.

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