An indwelling catheter apparatus for providing fluid to the central venous system, comprising: (a) an indwelling cannula adapted for insertion into subcutaneous tissue in the chest wall and approximately within the superior vena cava, the indwelling cannula having (i) an indwelling distal end,...http://www.google.com/patents/US5817072?utm_source=gb-gplus-sharePatent US5817072 - Central venous system catheter apparatus with means for subcutaneous delivery of anesthetic agent of other fluid medicament 
