Surgery and Radiology Section

MECHANICAL

• The bacterial and viral ultra fine sintered glass and membrane filters of pore size not exceeding 1nm are used for filtration of liquids which are heat sensitive.
• This procedure is used for solution that cannot tolerate sterilization by heat.
• The Seitz filter of asbestos and burke filter (or) diatomaceous earth filter are quite absorptive.
• More satisfactory filters are made of unglazed porcelain, sintered glass (or) nitrocellulose.
• Ultrasonic waves with a frequency of 15,000 to several hundred thousand per second, sound waves denature proteins and disperse a variety of materials and can be used for sterilization.
• The effect however has not been of practical value as a means of sterilization.