Patent ID: 8491347

Claim:
A variable-dimension water jet comprising: a. a water jet exit channel comprising: i. at least one rigid cylindrical portion comprising: 1. an exit channel dimension; 2. an exit channel length; and 3. at least one inner cylindrical surface having said exit channel dimension for at least a portion of said exit channel length; ii. at least one resilient exit channel wall portion comprising at least one exit channel surface, wherein said at least one exit channel surface is flush to said at least one inner cylindrical surface in a first state, and wherein said at least one resilient exit channel wall portion further comprises a canister, a rigid ring with a plurality of radial perforations, a resilient ring mounted on said rigid ring, and an annular cap operable to compress said resilient ring; b. at least one plenum adjacent said resilient exit channel wall portion; and c. at least one pressure inlet into said plenum, operable to conduct pressurized fluid into said at least one plenum to distend said resilient exit channel wall portion into said water jet exit channel.