Patent ID: 7621349

Claim:
A drill bit ( 1 ) with a fixed cutting structure, comprising: a tool body ( 2 ) including a central conduit for a drilling fluid; several blades ( 3 ), which include a metal matrix impregnated with abrasive particles and which are fixed to the tool body while extending forwards from the tool body; the blades ( 3 ) forming conjointly a front cutting face ( 7 ), and having radial passages ( 4 ) for a drilling fluid that mutually separate the blades ( 3 ) and are open towards the outside of the tool body wherein the radial passages each have a bottom connected to the central conduit to allow the drilling fluid to emerge from the bottoms of the radial passages; and several bridges ( 6 , 6 ′, 6 ″) disposed inside at least one radial passage ( 4 ) for a fluid disposed between two aforementioned blades ( 3 ), wherein said bridge connects these two blades, while being disposed between the tool body ( 2 ) and the-front cutting face ( 7 ).