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The present invention provides an expansion chamber that can be attached to a conventional underwater drainage device used for draining a body cavity. The attaching means permits the expansion chamber to be quickly attached to the drainage device and when attached to become rigidly and securely conn

The present invention provides an expansion chamber that can be attached to a conventional underwater drainage device used for draining a body cavity. The attaching means permits the expansion chamber to be quickly attached to the drainage device and when attached to become rigidly and securely connected thereto. The connecting means comprises fitting engageable male and female rails, one of which is connected along its side and extends from the expansion chamber and the other of which is connected along its side and extends from the drainage device. A connecting chamber is rigidly attached at one end thereof to the top of the expansion chamber and extends longitudinally therefrom. Depending from the other end and securely mounted thereto is a hollow needle. The needle can engage and penetrate a self-sealing grommet located in the top of the drainage device. In this manner, the drainage device can be used to maintain the same vacuum within the expansion chamber as within the drainage device. An outlet at the top of the expansion chamber permits connection with a thoracotomy tube to a body cavity at a location that is different from the location where the drainage device is connected.

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