Clean booth

The patent inverts the conventional positive pressure approach by implementing a negative pressure chamber system. The air exhaust fan creates negative pressure inside the booth, causing air to flow from the outside environment into the booth rather than from the booth to the outside. This inversion of pressure differential fundamentally changes the contamination control mechanism, preventing contaminants generated inside the booth from diffusing to the external environment while medical personnel wear protective equipment to maintain their own cleanliness.

The patent introduces protective equipment for medical personnel as an intermediary barrier. Instead of relying solely on pressure differentials to protect personnel, the system uses personal protective equipment (masks, gowns, gloves) as a mediator between the contaminated internal environment and the personnel, allowing the negative pressure system to focus on preventing external contamination while personnel protection handles internal exposure risks.

The patent applies the inversion principle by reversing the conventional approach: instead of using positive pressure to maintain internal cleanliness, it uses negative pressure to achieve the same effect. The air exhaust fan continuously removes air from the booth, creating negative pressure that draws clean air from the external environment through the door gap and other openings, thereby maintaining air cleanliness inside the booth while simultaneously preventing pathogen leakage to the outside.

The negative pressure system serves multiple functions simultaneously: it prevents pathogen leakage to the external environment, maintains air cleanliness inside the booth by drawing in clean external air, and reduces the reliance on complex internal filtration systems. This multi-functional approach resolves the contradiction by making the same pressure differential work for both contamination prevention and air quality maintenance.

The patent inverts the conventional HEPA filter placement and pressure approach. Instead of installing HEPA filters on the air supply side to maintain positive pressure, the system installs the HEPA filter on the air exhaust side and maintains negative pressure. This inversion allows the filter to capture contaminants before they are exhausted to the external environment, while the negative pressure continuously draws clean air into the booth through unfiltered openings, achieving both internal cleanliness and external contamination suppression.

The patent applies local quality by placing the HEPA filter specifically at the air exhaust location rather than distributing filtration throughout the air supply system. This localized filtration approach, combined with negative pressure, creates a system where contamination is captured at the point of exhaust while clean air enters through unfiltered openings, optimizing both filtration efficiency and pressure differential maintenance.