Pressure Equalizing Device

摘要

The present invention relates to a pressure equalising device with a pressure equalising balloon, the volume of which is connected to a further volume, the pressure of which is intended to be kept at as constant a value as possible even in the event of an enforced change in volume. In order therefore to keep the cuff pressure within the pressure range that is generally considered to be useful and optimal of between approximately 20 mbar and 30 mbar, but also make possible, if required, to increase the pressure in a controlled manner, according to the invention the equalising balloon keeping the pressure generally constant is accommodated in a protective sleeve which has radial bulges deviating from a uniformly concave form matched to the outer contour of the balloon, which bulges are designed such that the equalising balloon first abuts against the wall areas of the protective sleeve matched to the contour of the balloon and then, when pressure is increased, extends only into the bulges, whereby the pressure in the equalising balloon gradually increases as the volume in the bulges increases.

主权项

1. A pressure equalization device comprising a pressure equalization balloon, whose volume is connected to a further volume, the pressure of which is to maintain a value which is as constant as possible even in the event of a forced change in volume, characterised in that the equalization balloon which keeps the pressure generally constant is accommodated in a protective case which has radial outward bulges deviating from a uniformly concave shape matched to the outside contour of the balloon, which bulges of such a configuration that the equalization balloon firstly bears against wall regions of the protective case, that are matched to the contour of the balloon, and then upon an increase in pressure expands only into the outward bulges, whereby the pressure in the equalization balloon gradually increases with the increase in volume into the outward bulges.