USA Patent No., ILA US 5,937,860 B1   US 6,705,321 B2 USA Patent No., Stylet US 6,422,239 B1 Canada Patent No., ILA/Stylet 2,231,331 Great Britain Patent No., ILA GB 2324040 B Great Britain Patent No, Stylet GB 2357437 B Other USA and Foreign Patents Pending