Method and device for determining the position of a catheter inside the body of a patient
First Claim
1. A method for detecting a position of a catheter when inside a body of a subject, comprising the steps of:
- inserting a calibration catheter into a body cavity;
in a calibration phase, transmitting signals between a plurality of known calibration positions of said calibration catheter in said body cavity and a position locator, and obtaining, at said position locator, a plurality of apparent calibration positions respectively associated with said known positions but deviating therefrom due to passage of said signals through body tissue;
in said calibration phase, generating a correction function from the deviation of said apparent calibration positions from said known calibration positions; and
correcting, using said correction function, subsequent signals transmitted between a medical procedure catheter in said body cavity and said position locator to obtain an identification of an actual position of said medical procedure catheter in said body cavity.
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Accused Products
Abstract
In a method and apparatus for determining the position of a catheter inside the body of a patient, position signals are transmitted between the catheter and a position location unit, located at a distance from the catheter, the position signals are transmitted during a calibration stage from known calibration positions inside the body, or position signals, transmitted by the position location unit, are received at the known calibration positions. A correction function is determined from the difference between the calibration positions derived from the received location signals and the known, true calibration positions, whereupon catheter positions, derived from received position signals, are corrected in subsequent measurement stages according to the correction function.
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Citations
39 Claims
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1. A method for detecting a position of a catheter when inside a body of a subject, comprising the steps of:
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inserting a calibration catheter into a body cavity; in a calibration phase, transmitting signals between a plurality of known calibration positions of said calibration catheter in said body cavity and a position locator, and obtaining, at said position locator, a plurality of apparent calibration positions respectively associated with said known positions but deviating therefrom due to passage of said signals through body tissue; in said calibration phase, generating a correction function from the deviation of said apparent calibration positions from said known calibration positions; and correcting, using said correction function, subsequent signals transmitted between a medical procedure catheter in said body cavity and said position locator to obtain an identification of an actual position of said medical procedure catheter in said body cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for detecting a position of a catheter when inside a body of a patient, comprising:
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a calibration catheter adapted for insertion into a body cavity; a position locator; means for transmitting signals, in a calibration phase, between a plurality of known calibration positions of said calibration catheter in said body cavity and said position locator; said position locator comprising means for obtaining a plurality of apparent calibration positions respectively associated with said known positions but deviating therefrom due to passage of said signals through body tissue; means, in said calibration phase, for generating a correction function from the deviations of said apparent calibration positions from said known calibration positions; a medical procedure catheter for conducting a medical procedure, subsequent to said calibration phase, in said body cavity, and means for transmitting signals between said medical procedure catheter and said position locator while said medical procedure catheter is in said body cavity, said position locator comprising means for identifying an apparent position of said medical procedure catheter in said body cavity from said signals transmitted between said medical procedure catheter and said position locator; and means for correcting said apparent position of said medical procedure catheter, using said correction function, to identify an actual position of said medical procedure catheter in said body cavity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification