A device for sealing a patent foramen ovale in the heart is provided. The variable AGC setpoint can be determined based in part on the type of modulation used to convey information to the receiver. The cycle slip detection filter receives a phase difference generated by the phase comparison circuit and transforms the phase difference into a filtered phase difference. There is also included a gas sampling, a gas sampling conduit end piece and a flared main oxygen delivery tube end piece to be receivably coupled to an oxygen supply. In one case, the method includes connecting a memory cell to a ring oscillator and measuring the frequency resulting for said ring oscillator. As a result, it becomes possible to make small the deceleration on a rear surface of the tip portion of the moving blade.