Abstract
Retinal detachment is a serious vision threatening disease. Current consensus for the treatment of retinal detachment is to reattach the retina onto the choroid layer by drainage of accumulated subretinal fluid. Although several surgical methods have been developed, no satisfactory visual outcome has been obtained without surgical complications such as unintended puncture and hemorrhage of the retina and choroid tissue. In this study, we developed a novel Curved-Micro-Drainer (CMD) for the innocuous drainage of subretinal fluid. It is a curved structure with a 15° beveled tip that is 5 mm in length, with an 80 μm inner diameter and a 100 μm outer diameter. This high inner-to-outer diameter ratio of CMD with a 100 μm outer diameter allows efficient drainage of highly viscous subretinal fluid in a minimally invasive manner. In addition, the curved structure precisely matches the spherical ocular structure, which facilitates the CMD insertion into the subretinal space without choroid tissue damage. We demonstrate that the optimized CMD allows for the innocuous drainage of the viscous subretinal fluid from the porcine eye, whereas the traditional hypodermic needle (31-gauge) induces severe retinal and choroid damage. CMD can overcome a critical safety issue and is a potential alternative to conventional surgical interventions for the innocuous drainage of subretinal fluid.
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Acknowledgments
This work was supported by the R&D program of MSIP/COMPA (2015 K000201, Development of minimal pain multi-micro lancets for one-touch-smart diagnostic sensor) and also by grants from the Korean Health Technology R&D Project, Ministry for Health and Welfare, Republic of Korea (HI10 C1959) and the Public Welfare & Safety Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0020772).
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Yonghao Ma1 and ChangYeol Lee contributed equally to this work.
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Figs. 1
Time of draining different volume of distilled water by 15°, 30°, 45°, and 90° bevel angle of CMD. Data are shown as mean ± SEM from three independent experiments. P < 0.05 (*) indicates significant differences compared with the control group (GIF 17 kb)
Figs. 2
The penetration force of porcine retina tissue with blunt and 15° BA of 20 μm wall thickness of CMD. Data are shown as mean ± SEM from three independent experiments. P < 0.05 (*) indicates significant differences compared with the control group (GIF 15 kb)
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Ma, Y., Lee, C., Li, C.G. et al. Minimally invasive curved-micro-drainer (CMD) capable of innocuous drainage of subretinal fluid for the treatment of retinal detachment. Biomed Microdevices 18, 65 (2016). https://doi.org/10.1007/s10544-016-0088-5
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DOI: https://doi.org/10.1007/s10544-016-0088-5