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Safe transfusion, is designed to prevent giving fluids from being completed when patients forget to remove the needle.The traditional infusion equipment will enable air to be injected into body , or cause blood flowing back into the pipeline if not to remove the needle when finishing. This caused a lot of trouble. A new type of liquid infusion equipment we designed，can block air, not to let the blood flow back. A very simple design, we use a plastic red ball whose density is lower than liquid in the pipeline.