Patent ID: 8899354

Claim:
A drill bit, comprising: a cutting face with one or more fixed cutting elements; a flow passage extending through a drill bit head to the cutting face; a flow interrupter within the drill bit and positioned to interrupt flow of fluid through the flow passage, the flow interrupter comprising: a disk having at least one opening and a manifold, wherein the disk is rotationally mounted in the manifold such that the at least one opening is rotated in and out of alignment with the flow passage to interrupt fluid flow during operation; and a power section within the drill bit having a housing defining a first flow path internal to the housing and a second flow path external to the housing, the power section comprising a short stage positive displacement motor internal to the housing wherein the short stage positive displacement motor rotates when fluid flows along the first flow path, the power section comprising a shaft coupled to the disk to cause the disk to rotate in the manifold.