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An implantable transducer for two-degree-of-freedom joint angle sensing

Johnson, Mark William
http://rave.ohiolink.edu/etdc/view?acc_num=case1057693461

Abstract Details

1994, Doctor of Philosophy, Case Western Reserve University, Biomedical Engineering.
An implantable joint angle transducer (IJAT) was developed for chronic use with upper extremity functional neuromuscular stimulation (FNS) neuroprostheses. The IJAT uses a permanent magnet surgically implanted in one bone, and an array of Hall effect sensors surgically implanted in the opposing bone. As the joint is moved, the sensors detect the relative position and orientation changes of the magnet, producing voltages related to the movement. A mathematical transformation is used to convert the sensor voltages into measures of the joint angle. Titanium encapsulation protects the magnet, sensors, and support electronics, and secures the packages in the bone. The IJAT provides consistent, reliable, high quality signals that reflect joint movement from mid-sized two-degree-of-freedom joints. Mathematical modeling techniques were developed for predicting the transfer characteristics of an IJAT when the magnet and sensor array are surgically placed into joints having different geometric configurations, and for calibrating and characterizing operation of the IJAT after implantation. IJATs were implanted using a chronic in-vivo dog model to demonstrate the feasibility of implantation and periodic measurement techniques, and to validate use of the modeling techniques prediction of function and calibration. The flexion resolution r anged from 0.4° to 3.0° , the maximum deviation from a linear response was 9° , and over joints ranges up to 108° . The resolution and linearity depend on several transducer and joint geometry parameters, and can be predicted pre-implantation and calibrated post-implantation using the modeling techniques. The IJAT is suitable for use as either a command control or feedback sensor.
P. Peckham (Advisor)
182 p.
implantable transducer angle sensing

Recommended Citations

Citations

  • Johnson, M. W. (1994). An implantable transducer for two-degree-of-freedom joint angle sensing [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1057693461

    APA Style (7th edition)

  • Johnson, Mark. An implantable transducer for two-degree-of-freedom joint angle sensing. 1994. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1057693461.

    MLA Style (8th edition)

  • Johnson, Mark. "An implantable transducer for two-degree-of-freedom joint angle sensing." Doctoral dissertation, Case Western Reserve University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057693461

    Chicago Manual of Style (17th edition)

case1057693461
794
© 1994, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.