Leadless magnetic cardiac pacemaker

DETAILED DESCRIPTION We claim: 1.
A cardiac pacemaker for controlling heart rate comprising: first function generating means for generating a first electrical signal having a first wave shape and a first frequency; second function generating means for generating a second electrical signal having a second wave shape and a second frequency; delay timer means coupled between said first and second function generators for triggering said second function generator as a delayed function of a trigger signal generated by said first function generator; adder means coupled to said first and second function generating means for adding said first and second electrical signals; field coil means coupled to the output of said adder means for generating pulsed magnetic field signals as a function of said added first and second electrical signals; and a housing containing said first and second function generating means, said adder means, and said field coil means, said housing comprising, at least partially, magnetically transparent material, said housing being adapted to be located externally or subcutaneously near the hear to thereby control heart rate as a function of said pulsed magnetic field signals.
2.
The cardiac pacemaker of claim 1, wherein said adder means includes means to provide biphasic pulses at the output of said adder means.
3.
The cardiac pacemaker of claim 1, wherein said first function generator comprises means for generating a first signal having a frequency f.
sub.
1 in the range of 0.
1 Hz to 3000 Hz.
4.
The cardiac pacemaker of claim 3, wherein said first function generator includes means to generate a biphasic pulse signal.
5.
The cardiac pacemaker of claim 3, wherein said first function generator includes means to generate a sinusoidal pulse signal.
6.
The cardiac pacemaker of claim 3, wherein said first function generator includes means to generate triangular pulses at its output.
7.
The cardiac pacemaker of claim 1, wherein said second function generator comprises means for generating a second signal having a frequency f