This work is part of a multidisciplinary project developing design and manufacturing methods for narrow-gauge surgical instruments intended for advanced minimally invasive surgery. The instruments are designed specifically for Penn State’s lost mold rapid infiltration forming process, which is capable of fabricating hundreds of freestanding meso-scale parts. In previous work, a 1 mm diameter forceps case study demonstrated the design and fabrication process. The forceps is a monolithic compliant mechanism (CM) that relies on contact to re-distribute maximum stresses to generate larger elastic tip deflections; a phenomenon defined here as contact stress-relief. Prototypes were developed and evaluated in an end user surgical simulator. Feedback from 11 clinicians identified the total jaw opening of the forceps must be increased in the next generation of prototypes. This paper focuses on exploiting the benefits of contact-aided compliant mechanism (CCM) design to obtain larger elastic tip deflections and thus jaw openings. Using the commercially available finite element software package ANSYS to model large deformation and contact, an optimization problem is developed to determine the effects of incorporating additional contact elements in a CCM design on maximizing elastic tip deflection. Results show that designs with multiple contact elements generate larger elastic tip deflections due to a multi-stage contact stress-relief profile.
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ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
August 28–31, 2011
Washington, DC, USA
Conference Sponsors:
- Design Engineering Division and Computers and Information in Engineering Division
ISBN:
978-0-7918-5483-9
PROCEEDINGS PAPER
Design of a Multi-Contact-Aided Compliant Mechanism
Milton E. Aguirre,
Milton E. Aguirre
Pennsylvania State University, University Park, PA
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Mary Frecker
Mary Frecker
Pennsylvania State University, University Park, PA
Search for other works by this author on:
Milton E. Aguirre
Pennsylvania State University, University Park, PA
Mary Frecker
Pennsylvania State University, University Park, PA
Paper No:
DETC2011-48637, pp. 255-259; 5 pages
Published Online:
June 12, 2012
Citation
Aguirre, ME, & Frecker, M. "Design of a Multi-Contact-Aided Compliant Mechanism." Proceedings of the ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Volume 6: 35th Mechanisms and Robotics Conference, Parts A and B. Washington, DC, USA. August 28–31, 2011. pp. 255-259. ASME. https://doi.org/10.1115/DETC2011-48637
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