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Miniaturized Force/Torque Sensor for In Vivo Measurements of Tissue Characteristics

Hessinger, Markus and Pilic, Tobias and Werthschützky, Roland and Pott, Peter P. (2016):
Miniaturized Force/Torque Sensor for In Vivo Measurements of Tissue Characteristics.
In: 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Orlando, Florida, USA, 16.-20. August 2016, [Conference or Workshop Item]

Abstract

This paper presents the development of a surgical instrument to measure interaction forces/torques with organic tissue during operation. The focus is on the design progress of the sensor element, consisting of a spoke wheel deformation element with a diameter of 12 mm and eight inhomogeneous doped piezoresistive silicon strain gauges on an integrated full-bridge assembly with an edge length of 500 µm. The silicon chips are contacted to flex-circuits via flip chip and bonded on the substrate with a single component adhesive. A signal processing board with an 18 bit serial A/D converter is integrated into the sensor. The design concept of the handheld surgical sensor device consists of an instrument coupling, the six-axis sensor, a wireless communication interface and battery. The nominal force of the sensing element is 10 N and the nominal torque is 1 N∙m in all spatial directions. A first characterization of the force sensor results in a maximal systematic error of 4.92 % and random error of 1.13 %.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Hessinger, Markus and Pilic, Tobias and Werthschützky, Roland and Pott, Peter P.
Title: Miniaturized Force/Torque Sensor for In Vivo Measurements of Tissue Characteristics
Language: English
Abstract:

This paper presents the development of a surgical instrument to measure interaction forces/torques with organic tissue during operation. The focus is on the design progress of the sensor element, consisting of a spoke wheel deformation element with a diameter of 12 mm and eight inhomogeneous doped piezoresistive silicon strain gauges on an integrated full-bridge assembly with an edge length of 500 µm. The silicon chips are contacted to flex-circuits via flip chip and bonded on the substrate with a single component adhesive. A signal processing board with an 18 bit serial A/D converter is integrated into the sensor. The design concept of the handheld surgical sensor device consists of an instrument coupling, the six-axis sensor, a wireless communication interface and battery. The nominal force of the sensing element is 10 N and the nominal torque is 1 N∙m in all spatial directions. A first characterization of the force sensor results in a maximal systematic error of 4.92 % and random error of 1.13 %.

Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
Event Title: 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Event Location: Orlando, Florida, USA
Event Dates: 16.-20. August 2016
Date Deposited: 22 Sep 2016 11:00
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