abstract cover covered covering device discarded dose-delivery drug-delivery easy-to-use essential-care fine-points hollow-needles in-use injection-pen-needles injections medical medical-equipment metal multiple-daily-injections needle needles pen-needles penetration plastic plastic-caps plastic-hubs safety self-care self-treatment sharp sharps steel thin tips used air-bubbles air-pockets appearance backgrounds blue bubble bubble-plastic colorful colourful cool cushioned cushioning cushioning-material dark firm fitted light perspectives plastic-bubble-technology pool pool-cover protection protective rolled-out shapes sheets spread surface surfaces swimming-pool texture textured textures wallpaper duty of care gradens greenery hood hooded hoods outdoor outdoors park plastic capes protected public park rain rain capes raining relaxation relaxing responsibility responsible sheltered socialising surroundings surrounds wet abundant background connect covers distinctive edges geometric geometrical hard hollow hollowed lighting needle-pen-shields needle-protectors patterned patterns pieces plastics plentiful protecting protectors rimmed rims round rounded shaped smooth surfacing synthetics tubular white duty-of-care plastic-capes public-park rain-capes umbrellas basket Bin bottle bottles collect ecology litter package packaking paper pet recycle recycling trash wheels black shine tarp tarpaulin wrinkle wrinkled wrinkles garb protect rain gear raincoat yellow