Patent ID: 7380572

Claim:
An energy attenuation apparatus in fluid communication with tubing that is adapted to convey a liquid under pressure, said apparatus comprising: a liquid-conveying means that is in fluid communication with said tubing and has a diameter that is greater than a diameter of said tubing, wherein said liquid-conveying means is provided with four chambers disposed in series, wherein at least one of said chambers contains a tube, wherein an annular space is formed between an inner peripheral surface of said liquid-conveying means and an outer peripheral surface of said tube, wherein said tube has a first end connected to and in fluid communication with an inlet or outlet end of said at least one chamber, wherein said tube has a second, free end that is spaced by an open gap from said outlet or inlet end of said at least one chamber, wherein said tube has at least one aperture in said free end and/or on said peripheral surface thereof for providing fluid communication between said tube and said at least one chamber, and wherein at least one of said chambers contains no physical structure.