to the circular base plate, the first projections being brought into engagement with the guide grooves. The Oldham ring also has a pair of second projections formed on the other surface thereof opposite to the surface on which the first projections are formed, the second projections being brought into engagement with a housing of the compressor so as to prevent the revolution of the Oldham ring. The swivel scroll is driven to reciprocate in the rectilinear direction along the pair of first projections while being restrained from moving in the direction of revolution of itself due to the engagement relationship between the guide grooves and the first projections.
In the conventional scroll type compressor, it has been general to employ a swivel scroll and an Oldham ring made ofthat it had updated the device to use thinner electrical leads into the heart. But the new wires were prone to fracture, hitting some patients repeatedly with shocks when their hearts were fine, and not delivering shocks to others who needed them. Doctors put the Sprint Fidelis into Bridget Robb, a patient from Pennsylvania in her early 30s. It shocked her 31 times in a span of minutes in 2007. She said in congressional testimony that it felt like being shot in the chest by a cannon at close range.

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By the time Medtronic recalled the defibrillator in 2007, about a quarter-million were in circulation worldwide. Individuals implanted with it live under a sword of Damocles: They risk electrocution and possible death if they leave the Sprint Fidelis alone