Background: Implantable medical devices have increasingly large capacities for storing patient data as a diagnostic aid and to allow patient monitoring. Although these devices can store a significant amount of data, an increased ability for data storage was required for chronic monitoring in recent physiological studies. Method of Approach: Novel high capacity implantable data recorders were designed for use in advanced physiological studies of canines and free-ranging black bears. These hermitically sealed titanium encased recorders were chronically implanted and programmed to record intrabody broadband electrical activity to monitor electrocardiograms and electromyograms, and single-axis acceleration to document relative activities. Results: Changes in cardiac T-wave morphology were characterized in the canines over a period, providing new physiological data for the design of algorithms and filtering schemes that could be employed to avoid inappropriate implantable defibrillator shocks. Unique characteristics of bear hibernation physiology were successfully identified in the black bears, including: heart rate, respiratory rate, gross body movement, and shiver. An unanticipated high rejection rate of these devices occurred in the bears, with five of six being externalized during the overwintering period, including two devices implanted in the peritoneal cavity. Conclusions: High capacity implantable data recorders were designed and utilized for the collection of long-term physiological data in both laboratory and extreme field environments. The devices described were programmable to accommodate the diverse research protocols. Additionally, we have described substantial differences in the response of two species to a common device. Variations in the foreign body response of different mammals must be identified and taken into consideration when choosing tissue-contacting materials in the application of biomedical technology to physiologic research.
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November 2005
Technical Papers
High Capacity Implantable Data Recorders: System Design and Experience in Canines and Denning Black Bears
Timothy G. Laske,
Timothy G. Laske
Departments of Surgery and Physiology,
University of Minnesota
, Minneapolis, MN 55432 and Medtronic Inc.
, Minneapolis, MN 55455
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Henry J. Harlow,
Henry J. Harlow
Department of Zoology and Physiology,
University of Wyoming
, Laramie, WY 82071
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Jon C. Werder,
Jon C. Werder
Medtronic Inc.
, Minneapolis, MN 55432
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Mark T. Marshall,
Mark T. Marshall
Medtronic Inc.
, Minneapolis, MN 55432
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Paul A. Iaizzo
Paul A. Iaizzo
Departments of Surgery and Physiology,
University of Minnesota
, Minneapolis, MN 55455
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Timothy G. Laske
Departments of Surgery and Physiology,
University of Minnesota
, Minneapolis, MN 55432 and Medtronic Inc.
, Minneapolis, MN 55455
Henry J. Harlow
Department of Zoology and Physiology,
University of Wyoming
, Laramie, WY 82071
Jon C. Werder
Medtronic Inc.
, Minneapolis, MN 55432
Mark T. Marshall
Medtronic Inc.
, Minneapolis, MN 55432
Paul A. Iaizzo
Departments of Surgery and Physiology,
University of Minnesota
, Minneapolis, MN 55455J Biomech Eng. Nov 2005, 127(6): 964-971 (8 pages)
Published Online: July 29, 2005
Article history
Received:
April 1, 2005
Revised:
July 29, 2005
Citation
Laske, T. G., Harlow, H. J., Werder, J. C., Marshall, M. T., and Iaizzo, P. A. (July 29, 2005). "High Capacity Implantable Data Recorders: System Design and Experience in Canines and Denning Black Bears." ASME. J Biomech Eng. November 2005; 127(6): 964–971. https://doi.org/10.1115/1.2049340
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