Surgical grasper is one of the most common used tools in surgery. To effectively grasp soft slippery tissues, traditional surgical graspers are usually constructed with sharp teeth to deform tissue and form mechanical interlock between interfaces, which easily leads to strong tissue damages. Improvement of wet friction properties at the interface between the surgical grasper and soft tissue can greatly reduce the holding force required and the soft tissue damage. To design a surface with strong wet attachment performance, the wet attachment mechanisms of tree frog has been studied. Here we find that its toe pad is constructed with micropillar array, which mainly are hexagon. With liquid volume decreasing, the uniform liquid self-splitting effect has been observed on micropillar array surface, and the boundary friction appears on both tree frog's toe pad and bioinspired surface. This boundary friction mainly comes from the thin liquid film induced strong capillary force and leads to strong friction without any normal force. Besides, the anisotropic pillars and channels' distribution on toe pad leads to its directional dependent friction. By testing the friction of different pillar structure surfaces and traditional surgical grasper surfaces with macroscale teeth, the hexagonal pillar pattern exhibited improved wet frictional performance, which is appropriate for bioinspired surgical graspers. Finally, the soft tissue damage of these patterns was evaluated, and the effectiveness of biomimetic surface patterns when applied in surgical graspers is confirmed.
ZHANG Liwen
,
CHEN Huawei
,
WANG Yan
,
ZHANG Pengfei
,
ZHANG Guokai
,
ZHANG Deyuan
. Bioinspired Surgical Grasper Based on the Strong Wet Attachment of Tree Frog's Toe Pads[J]. Journal of Mechanical Engineering, 2018
, 54(17)
: 14
-20
.
DOI: 10.3901/JME.2018.17.014
[1] PETERS J H,GIBBONS G,INNES J,et al. Complications of laparoscopic cholecystectomy[J]. Surgery,1991,110(4):777-778.
[2] PONSKY J L. Complications of laparoscopic cholecystectomy[J]. American Journal of Surgery,1991,12(4):393-395.
[3] SOPER N J,DUNNEGAN D L. Does laparoscopic gallbladder perforation influence the early outcome of laparoscopic cholecystectomy?[J]. Surgical Laparoscopy Endoscopy & Percutaneous Techniques,1991,1(3):156-161.
[4] DONOHUE J H,FARNELL M B,GRANT C S,et al. Laparoscopic cholecystectomy:Early Mayo Clinic experience[J]. Mayo Clinic Proceedings,1992,67(5):449-455.
[5] JOHNSTON S,O'MALLEY K,MCENTEE G,et al. The need to retrieve the dropped stone during laparoscopic cholecystectomy[J]. American Journal of Surgery,1994,167(6):608-610.
[6] CHIN P T,BOLAND S,PERCY J P. "Gallstone Hip" and other sequelae of retained gallstones[J]. HPB Surgery,2008,10(3):165-168.
[7] GRAHAM M D,ANDERSON P G,TOOULI J. Abdominal wall sinus:A late complication of gallstone spillage during laparoscopic cholecystectomy[J]. HPB Surgery,1997,10(3):163-164.
[8] PATTERSON E J,NAGY A G. Don't cry over spilled stones? Complications of gallstones spilled during laparoscopic cholecystectomy:Case report and literature review[J]. Canadian Journal of Surgery,1997,40(4):300-304.
[9] SCHRENK P,WOISETSCHLÄGER R,RIEGER R,et al. Mechanism,management,and prevention of laparoscopic bowel injuries[J]. Gastrointestinal Endoscopy,1996,43(6):572-574.
[10] BISHOFF J T,ALLAF M E,KIRKELS W,et al. Laparoscopic bowel injury:Incidence and clinical presentation[J]. Journal of Urology,1999,161(3):887-890.
[11] DARGAHI J,PARAMESWARAN M,PAYANDEH S. A micromachined piezoelectric tactile sensor for an endoscopic grasper-theory,fabrication and experiments[J]. Journal of Microelectromechanical Systems,2000,9(3):329-335.
[12] ROAN P R,WRIGHT A S,LENDVAY T S,et al. An instrumented minimally invasive surgical tool:Design and calibration[J]. Applied Bionics & Biomechanics,2014,8(2):173-190.
[13] VONCK D,GOOSSENS R H M,EIJK D J V,et al. Vacuum grasping as a manipulation technique for minimally invasive surgery[J]. Surgical Endoscopy,2010,24(10):2418-2423.
[14] VARENBERG M,GORB S N. Hexagonal surface micropattern for dry and wet friction[J]. Advanced Materials,2010,21(4):483-486.
[15] WANG K,HE B,SHEN R J. Influence of surface roughness on wet adhesion of biomimetic adhesive pads with planar microstructures[J]. Micro & Nano Letters,2012,7(12):1274-1277.
[16] BARNES W J,BAUM M,PEISKER H,et al. Comparative cryo-SEM and AFM studies of hylid and rhacophorid tree frog toe pads[J]. Journal of Morphology,2013,274(12):1384-1396.
[17] HANNA G,JON W,BARNES W J. Adhesion and detachment of the toe pads of tree frogs[J]. Journal of Experimental Biology,1991,155(1):103-125.
[18] BARNES W J. Bionics and wet grip[J]. Tire Technology International,2002,2002:56-60.
[19] FEDERLE W,BARNES W J,BAUMGARTNER W,et al. Wet but not slippery:Boundary friction in tree frog adhesive toe pads[J]. Journal of the Royal Society Interface,2006,3(10):689-697.
[20] OLIVER J F,HUH C,MASON S G. Resistance to spreading of liquids by sharp edges[J]. Journal of Colloid and Interface Science,1977,59(3):568-581.
