Abstract: In accordance with certain techniques for filtering contaminated air, the air is sucked through at least one filter element, which is exchangeably held in a filter-holding device of an air duct system. In order to enable continuous filtering without process interruption, a plurality of filter elements is stored in the filter-holding device in such a way that, when one of the filter elements is removed, the soiled filter element is automatically replaced in the air duct system. For this purpose, the filter-holding device has a plurality of filter chambers, which are arranged relative to one another in such a way that, in the event of an exchange, the filter element can be slidingly guided from one of the filter chambers into another filter chamber.

Abstract: A system is proposed including an intramedullary nail with a longitudinal nail axis, a first lateral portion, a second lateral portion opposite to the first lateral portion, and a longitudinal bore. The nail has a locking hole arrangement having a first bore being formed in the first lateral portion and a second bore being formed in the second lateral portion. An axis of the first bore and an axis of the second bore are arranged with an offset from each other, and are arranged so that a locking member such as a screw may frictionally engage within both the first bore and the second bore.

Abstract: A system is proposed including an intramedullary nail with a longitudinal nail axis, a first lateral portion, a second lateral portion opposite to the first lateral portion, and a longitudinal bore. The nail has a locking hole arrangement having a first bore being formed in the first lateral portion and a second bore being formed in the second lateral portion. An axis of the first bore and an axis of the second bore are arranged with an offset from each other, and are arranged so that a locking member such as a screw may frictionally engage within both the first bore and the second bore.