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Insertion and pull Behavior of Worker Honeybee Stinger

Journal of Bionic Engineering 2016年第2期13卷 303-311页

作者： Jintian Ling Lelun Jiang Keyun Chen Chengfeng Pan Yan Li Wei Yuan Liang Liang School of Engineering Sun Yat-sen University Guangzhou 510006 China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China

Worker honeybee pierces animal or human skin with its ultra-sharp stinger and injects venom to defend itself. The insertion behavior is a painless transdermal drug delivery process. In this study, Apis cerana cerana worker honeybee was chosen as the research object. The geometry and structure of the stinger were observed by the Scanning Electron Microscope （SEM）. High-speed video imaging technique was adopted to observe the stinger insertion and pull behavior of honeybee. The skin insertion, pull-out, in-plane buckling and out-of-plane bending forces of honeybee stinger were tested by a self-developed mechanical loading equipment. Results showed that the honeybee stinger pierces directly into skin without frequent vibration. The pull-out force （average 136.04 mN） was two orders of magnitude higher than the penetration force （average 1.34mN）. Compared with the penetration force, the in-plane buckling force （average 6.72 mN） was in the same order of magnitude. The result of out-of-plane bending test showed that the stinger was elastic and it could recover after bending. The excellent geometry and structure of honeybee stinger will provide an inspiration for the further improved design ofmicroneedle-based transdermal drug delivery system.

关键词： stinger mechanical loading penetration force pull-out force barbs

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Inclined-cross Microstructure of Conch Shell

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Journal of Wuhan University of Technology(Materials Science) 2005年第B12期20卷 89-91页

作者：陈斌 Department of Engineering Mechanics Chongqing University Chongqing 400030 China

The microstructures of conch shell were observed with scanning electronic microscope （SEM）, and a kind of inclined-cross microstructure of aragonite sheets was found. The maximal pull-out force of the inclined-cross microstructure was analyzed based on its representative model and compared with that of a conventional 0 °- structure. The experimental result indicates that the maximal pull-out force of the inclined-cross microstructure is markedly larger than that of the 0°- structure.

关键词： conch shell inclined-cross structure pull-out force fracture toughness

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Biomimetic Hydroxyapatite Coated Titanium Screws Demonstrate Rapid Implant Stabilization and Safe Removal In-Vivo

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Journal of Biomaterials and Nanobiotechnology 2015年第1期6卷 20-35页

作者： Jan Henrik Sorensen Lutz Durselen Ken Welch Torben Christian Sorensen Philip Procter Hakan Engqvist Maria Stromme Anita Ignatius Hartwig Steckel Department of Pharmaceutics and Biopharmaceutics Christian-Albrechts UniversityKielGermany Institute of Orthopaedic Research and Biomechanics Centre of Musculoskeletal ResearchUlmGermany Division for Nanotechnology and Functional Materials The Angstrom LaboratoryUppsala UniversityUppsalaSweden Stryker Trauma GmbH SchonkirchenGermany Stryker Trauma AG SelzachSwitzerland Division for Applied Materials Sciences The Angstrom LaboratoryUppsala UniversityUppsalaSweden

The early fixation of bone screws after surgical implantation still remains a challenge in the field of traumatology. Whilst hydroxyapatite (HA) coatings are known to enhance the fixation of implants;their removal at a later time-point may be problematic. An HA coating has been developed to demonstrate that both implant fixation and safe removal are feasible in the same design. Accordingly the aim of this study was to compare the In-Vivo performance of thin biomimetic HA coated titanium screws to uncoated counterparts used as control after bilateral implantation in the femoral condyle of 36 New Zealand White Rabbits. The screws were analysed macroscopically, by histology, micro-CT and biomechanically at both two and six weeks post-implantation. The HA coated screws demonstrated excellent biocompatibility. At two weeks the HA coated screws demonstrated a significant increase in removal torque values as well as a strong trend towards higher pull-out forces. In addition histology confirmed a higher degree of osseointegration and direct bone to implant contact. At six weeks no difference in pull-out force and removal torque could be detected. SEM images confirmed the absence of any residual HA coating indicating a fast coating degradation In-Vivo. The low level of removal torque after full osseointegration at 6 weeks supports the feasibility of safe and easy removal of the implant. The HA coating under study appears to offer a unique characteristic of enhanced fixation with a minimal increase in removal torque after full osseointegration. This may be of value in clinical applications where it is necessary to assure both screw fixation and later removal.

关键词： Biomimetic Hydroxyapatite In-Vivo Screw Implant Removal pull-out force Removal Torque

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