Laminar flow purification means that the airflow is transported in a certain direction at a uniform speed, purified by a high-efficiency filter, streamlined into the operating room, and then flowed out after passing through the surgical space at an equal speed. Dust particles and pathogenic microorganisms in the operating room are discharged with the direction of the airflow, and will not spread in the room, laminar flow operating room that is named after this design.

First, the role of laminar flow purification
Laminar flow system is to achieve air purification, create a clean surgical space of an advanced equipment, is currently a safe, effective, economical and convenient means of air sterilization.

Second, the importance of laminar flow purification technology in the operating room
Operating room is an important place for hospitals to perform surgical treatment of patients, the quality of surgery often reflects the level of treatment in a hospital.

An important guarantee for the success of surgery is to establish a strict concept of asepsis and emphasize the aseptic technology operation in surgery to prevent surgical infection. Once an infection occurs after surgery, the consequences will be caused, many hospitals in order to avoid the occurrence of similar situations, had to strengthen the amount of antibiotics for patients, this method is very harmful to the patient, the country is also in the legislation through administrative means to control the amount of antibiotics. Therefore, the aseptic control of all aspects of surgery is getting more and more attention from all hospitals.

Third, the operating room pollution sources and pollution pathways
Sources of pollution in the operating room are mainly from the outside and from the internal operating room of the two parts:
1, from the external source of pollution is mainly sent to the operating room of the fresh air. With statistics, the number of bacteria and microorganisms in the outdoor air is about 1-1000/ft3, and most of these bacteria and microorganisms are attached to dust particles, and the degree of contamination in different areas is not the same.
2, from the clean operating room internal sources of pollution, mainly doctors and nurses of surgery, surgery patients and the surgical process of bacteria and dust production.
The biggest source of internal pollution is the surgeons, anesthesiologists and nurses, etc. Their clothes, skin and breathing produce a lot of dust and bacteria, and the amount of dust and bacteria produced is related to their attire, the intensity and frequency of their movements, the skills of the surgeons, the degree of disinfection, as well as the level of overall management. Therefore, healthcare workers entering the operating room should all change into operating room-specific clothing, hats, masks and shoes, except for close-fitting undergarments. The hat should cover all the hair and minimize the exposed skin, the operation should be light, and the transmission of surgical instruments should be stable and accurate.

Fourth, laminar flow purification operating room classification
1, laminar flow purification operating room airflow flow type
Laminar flow purification operating room airflow flow at home and abroad, mainly vertical unidirectional flow, horizontal unidirectional flow and non-unidirectional flow.

In our country in 2002 "hospital clean surgical department building technical specifications" in the provisions of: Class Ⅰ clean operating room of 100 clean area (surgical area) of the airflow must be unidirectional flow (vertical unidirectional flow), and high efficiency filters should be 75% -85% of the rate of full cloth; for the Ⅱ, Ⅲ and Ⅳ clean operating room surgical areas are Less than 100 levels of clean area, the airflow pattern for the non-unidirectional flow, but the air supply should be located in the upper part of the surgical area, high-efficiency filters should be centrally located in the surgical area above the air supply, clean airflow is required to cover the surgical area, so that the surgical area to obtain the best purification effect.

Experiments have proved that: in a variety of different air supply speed, vertical unidirectional flow than the horizontal unidirectional flow operating room bacteria concentration is low.