Catheter with serially connected sensing structures and methods of calibration and detection
AssigneeBiosense Webster (Israel) Ltd.
InventorsJeffrey L. Clark, George Kamin, Mark Stanley
Life of this patent
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Abstract
A catheter is responsive to external and internal magnetic field generators for generating signals representing position and pressure data, with a reduced number of sensing coil leads for minimizing lead breakage and failure. The catheter includes a flexible joint with pressure sensing and position coils, at least pair of a pressure sensing coil and a position coil are serially connected. Methods of calibrating a catheter for position and pressure sensing, and detecting magnetic field interference with one catheter by another catheter or other metal or ferrous object advantageously use signals between two sets of sensors as a “back up” or “error check”.
Claims20
A catheterization system, comprising:
- a plurality of external magnetic field generators, each external magnetic field generator configured to generate a position-data magnetic field;
- a catheter, comprising:
- a distal section configured for engagement with patient tissue, the distal section having a proximal portion, and a distal portion, the distal section comprising:
- an internal magnetic field generator positioned in one of the proximal or distal portions, the internal magnetic field generator generating a pressure-data magnetic field,
- three pressure sensing elements and two position sensing elements positioned in the other of the proximal and distal portions, the three pressure sensing elements configured to sense the pressure-data magnetic field and generate signals representative of data relating to pressure exerted on the distal section when engaged with tissue, the two position sensing elements configured to sense each of the position-data magnetic fields and generate signals representative of data relating to a position of the distal section, and
- a first lead serially connecting a first pair of one of the three pressure sensing elements and one of the two position sensing elements;
- and
- a signal processor configured to process signals received from the first pair to generate data indicative of one or more position parameters and/or one or more pressure parameters of the distal section of the catheter.
The system of clam 1, wherein:
- the one or more position parameters of the distal section of the catheter comprises location coordinates and/or orientation coordinates, or
- the one or more pressure parameters of the distal section of the catheter comprises axial displacement data and/or angular deflection data.
A catheterization system, comprising:
- a plurality of external magnetic field generators, each external magnetic field generator configured to generate a position-data magnetic field;
- a catheter, comprising:
- a distal section configured for engagement with patient tissue, the distal section having a proximal portion, and a distal portion, the distal section comprising:
- an internal magnetic field generator positioned in one of the proximal portion or the distal portion, the internal magnetic field generator configured to generate a pressure-data magnetic field,
- three or fewer pressure sensing coils and three or fewer position sensing coils positioned in the other of the proximal portion and the distal portion,
- the three or fewer pressure sensing coils configured to sense the pressure-data magnetic field and generate signals representative of data relating to pressure exerted on the distal section when engaged with tissue, each of the three or fewer pressure sensing coils being generally parallel with a longitudinal axis of the catheter,
- the three or fewer position sensing coils configured to sense each of the position-data magnetic fields and generate signals representative of data relating to a position of the distal section, and
- a first lead serially connecting at least one pair of one of the three or fewer pressure sensing coils and one of the three or fewer position sensing coils;
- a signal processor configured to process signals received from the at least one pair to generate data indicative of one or more position parameters and/or one or more pressure parameters of the distal section of the catheter.
The system of clam 15, wherein the one or more position parameters of the distal section of the catheter comprises location coordinates and/or orientation coordinates.
Dependencies are inferred from the claim text.