Patent ID: 8151908

Claim:
An apparatus comprising: a control sleeve; a power shaft; said power shaft at least partially surrounded by said control sleeve; said power shaft rotatable in relation to said control sleeve; said power shaft having a shaft wall; said power shaft having an interior power shaft channel extending therethrough; at least one shaft opening provided in said shaft wall; said at least one opening in fluid communication with said power shaft channel, wherein said at least one shaft opening is configured such that at least some of a fluid flowing through said interior power shaft channel will be directed through said at least one shaft opening and will exit out of said interior power shaft channel through said at least one shaft opening; said at least one shaft opening in said shaft wall having an interior opening and an shaft opening axis; said power shaft having a central longitudinal shaft axis and an upper end and a lower end; said shaft opening axis of said at least one shaft opening in said shaft wall acutely oriented with respect to a plane extending through said central longitudinal shaft axis wherein said plane intersects said shaft opening axis at said interior opening; a drill bit operationally connected to said power shaft; said drill bit having a cylinder wall; at least one drill bit opening provided in said cylinder wall; said at least one drill bit opening having a drill bit opening axis; and said drill bit opening axis acutely oriented in relation to the direction of said upper end of said power shaft.