C30 Optimization of photochemically fluorinated gasket for a medical syringe without silicon oil

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  • C30 オイルフリー注射器のためのガスケットの光化学的フッ素化処理とその最適化(OS12 ナノ加工と表面機能(2))

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In the medical field, plastic syringes are used with silicone oil for the sliding area between a barrel and gasket, where barrels are typically plastics such as PP (Polypropylene) and gaskets are made of TPE (Thermoplastic elastomer). However, silicone oil is considered to have some demerits: accumulation in the body and adsorption of medicine's constituent. Therefore, the development of unlubricated plastic syringes is desired. We reported that the friction coefficient between TPE and pp without silicone oil at normal load of 1 N was decreased by 77 % by photochemical fluorination of TPE. In this work, dependence of fluorination effect on normal load was investigated and we found optimum contact pressure for low friction and high sealing effect.

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