Tevar (pty) Ltd

Edward Charles Teddy Mudge

Peter Paul Zilla

Deon Bezuidenhout

A dilatation deviceincludes a supportand at least one inflatable tube. The inflatable tube is wound helically around the support and also defines a series of inflatable zonesalong its length, with successive inflatable zones spaced by an intermediate zonethat is more resistive to radial expansion than the inflatable zones. The inflatable tube further defines a fluid inletfor: introducing fluid to inflate the inflatable zones; and extracting fluid from the inflatable tube to deflate it, with each inflatable zone being in fluid communication with its successive inflatable zones via the intermediate zones. The axial critical buckling load of the inflatable zones is less than the radial critical buckling load of the inflatable zones, to cause the inflatable zones to concertina axially when the inflatable tube is depressurized, thereby causing the intermediate zones to displace towards each other.

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Cape Town, South Africa

Edward Charles Teddy Mudge