Markers for interventional devices in magnetic resonant image (mri) systems

A system for locating a catheter in a patient's body, the system comprising:

• a catheter having a resonant circuit, the resonant circuit having a resonant oscillating frequency;
• a pressure sensitive device coupled to the resonant circuit, the pressure sensitive device being attached to a body of the catheter;
• means for generating a magnetic field at the resonant oscillating frequency, the magnetic field inducing and causing the resonant circuit to oscillate;
• means for applying a pressure on the pressure sensitive device, the pressure applied on the pressure sensitive device changing the resonant frequency of the resonant circuit;
• means for detecting the oscillation of the resonant circuit;
• and
• means for determining location of the catheter based on the oscillation of the resonant circuit.

A system for locating a catheter in a patient's body, the system comprising:

• a catheter having a circuit, the resonant circuit having an oscillating frequency;
• a pressure sensitive device coupled to the circuit, the pressure sensitive device being attached to a body of the catheter;
• a piezoelectric device coupled to the resonant circuit, the piezoelectric device being attached to the body of the catheter;
• means for applying a first pressure on the piezoelectric device, the first pressure applied on the piezoelectric device causing the piezoelectric device to generate a current in and cause the circuit to oscillate;
• means for applying a second pressure on the pressure sensitive device, the second pressure applied on the pressure sensitive device changing the resonant frequency of the circuit;
• means for detecting the oscillation of the resonant circuit;
• and
• means for determining location of the catheter based on the oscillation of the resonant circuit.