A separation catch mechanism disposed above a power section of a motor prevents full separation of lower components of the motor from upper components and an attached drillstring. Each electrode possesses a central aperture, a right lateral aperture and a left lateral aperture all three substantially rectangular. An implantable medical device includes a microcomputer circuit configured to analyze the blood flow rate signal and detect a cardiac condition as a function of the blood flow rate signal. An additional tool device may be selectively attached to the housing. This pattern is repeated to achieve an efficient spacing of vehicles.