Pressure sensing unit, system and method for remote pressure sensing
AssigneeKoninklijke Philips N.V.
InventorsBERNHARD GLEICH, JÜRGEN ERWIN RAHMER
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Abstract
A pressure sensing unit comprises a membrane and two permanent magnets inside the cavity. One magnet is coupled to the membrane, and at least one magnet is free to oscillate with a rotational movement. At least one magnet is free to oscillate with a rotational movement. The oscillation takes place at a resonance frequency, which is a function of the sensed pressure, which pressure influences the spacing between the two permanent magnets. This oscillation frequency can be sensed remotely by measuring a magnetic field altered by the oscillation. The pressure sensing unit may be provided on a catheter or guidewire.
Claims15
A pressure sensing unit, comprising:
- a cavity comprises a membrane
- a first permanent magnet inside the cavity and coupled to the membrane;
- and
- a second permanent magnet inside the cavity,
- wherein the second permanent magnet is coupled to the cavity, and the first permanent magnet is rotationally coupled to the membrane.
A pressure sensing method, comprising:
- exciting a pressure sensing unit into a resonant oscillation using an excitation coil arrangement, wherein the pressure sensing unit comprises:
- a cavity comprising a membrane;
- a first permanent magnet inside the cavity and coupled to the membrane;
- a second permanent magnet inside the cavity, wherein the second permanent magnet is coupled to the cavity, and the first permanent magnet is rotationally coupled to the membrane, wherein at least a part of the magnetic moment is oriented perpendicular to the rotation axis, wherein the at least one of the permanent magnets is excited into the resonant oscillation;
- measure a magnetic field which is altered by the resonant oscillation;
- and
- determine a pressure from the frequency of alteration of the measured magnetic field.
Dependencies are inferred from the claim text.