In view of the future development requirements of the minimally invasive surgical arm, a method using the principle of negative pressure to enhance the interactions between discrete structures is proposed to adjust the stiffness of flexible surgical arms. A pneumatic multilayered fiber braid structure is specially designed and fabricated, cladded on the outer surface of the tube arm. For this structure, negative pressure can be obtained in the interlayer of the sealed fiber filaments by a vacuum pump, and the extrusion pressure and friction force between them increase consequently, leading to a stiffness enhancement of the arm. A semi-analytical method for quantitatively evaluate the flexural stiffness of the large-deformed arm is then studied. Finally, the experimental investigations are performed, focused on the influences of some key parameters on the stiffness adjustment effect of the arm, such as vacuum degree, the size of fiber filaments, the thickness of the packaging film, the cross section of the fiber layer, etc.
XU Xiaoliang
,
WANG Yongquan
,
WEN Kun
,
CHEN Hualing
,
WANG Shuxin
,
LI Dichen
. Research on the Rigidity Adjustment Performance of Flexible Surgical Arm Based on Fiber-coated Pneumatic Structure[J]. Journal of Mechanical Engineering, 2018
, 54(17)
: 46
-52
.
DOI: 10.3901/JME.2018.17.046
[1] MADHANI A J. Design of teleoperated surgical instruments for minimally invasive surgery[J]. Todo Hospital,1998,65(2):69-74.
[2] JOSIE H,UTK C. Soft manipulators and grippers:A review[J]. Frontiers in Robotics and AI,2016,3(69):1-12.
[3] HEINRICH M J. Celebrating soft matter's 10th anniversary:Toward Jamming by design[J]. Soft Matter.,2015,11:12-27.
[4] BROWN E,RODERNBERG N. Universal robotic gripper based on the Jamming of granularmaterial[J]. Proc. Natl. Acad. Sci.,2010,107:18809-18814.
[5] CIANCHETTI M,RANZANI T. Soft robotics technologies to address shortcomings in today's minimally invasive surgery:The STIFF-FLOP approach[J]. Soft Robotics,2014,1:122-131.
[6] 冯忠磊. 柔顺机构的2R伪刚体模型研究[D]. 北京:北京工业大学,2010. FENG Zhonglei. Research on 2R pseudo rigid body model of compliant mechanism[D]. Beijing:Beijing University of Technology,2010.
[7] 冯忠磊,余跃庆,王雯静. 模拟柔顺机构中柔顺杆件末端特征的2R伪刚体模型[J]. 机械工程学报,2011,47(1):36-42. FENG Zhonglei,YU Yueqing,WANG Wenjing. 2R pseudo rigid body model for the terminal characteristics of compliant bars in compliant mechanisms[J]. Journal of Mechanical Engineering,2011,47(1):36-42.
[8] 成立峰. 柔性铰链柔顺机构的动力学问题研究[D]. 北京:北京工业大学,2008. CHENG Lifeng. Research on dynamic problems of flexible hinges compliant mechanism[D]. Beijing:Beijing University of Technology,2008.
[9] 李茜,余跃庆,常星. 基于2R伪刚体模型的柔顺机构动力学建模及特性分析[J]. 机械工程学报,2012,48(13):40-48. LI Qian,YU Yueqing,CHANG Xing. Dynamic modeling and characteristics analysis of compliant mechanisms based on 2R pseudo rigid body model[J]. Journal of Mechanical Engineering,2012,48(13):40-48.
[10] 杜云磊. 柔性构件大变形分析及其在柔顺机构建模中的应用[D]. 西安:西安电子科技大学,2012. DU Yunlei. Analysis of large deformation of flexible component and its application in the modeling of compliant mechanism[D]. Xi'an:Xi'an Electronic and Science University,2012.
[11] 赵则昂,邓宗白,宋安平. 悬臂梁大挠度变形的近似估计法[J]. 力学与实践,2014,36(3):341-344. ZHAO Zeang,DENG Zongbai,SONG Anping. Approximate estimation of a cantilever beam with large deflection[J]. Mechanics and Practice,2014,36(3):341-344.
[12] SU H J. A load independent pseudo-rigid-body 3R model for determining large deflection of beams in compliant mechanisms[C]//ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference,American Society of Mechanical Engineers,2008:109-121.
