Method and apparatus for measuring blood volume
First Claim
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1. A method for positioning a sensing tip disposed in a ventricle, the method comprising:
- obtaining an excitation waveform generated by one pair of electrodes disposed on said sensing tip;
obtaining a conductance waveform sensed by another pair of electrodes disposed on said sensing tip;
enabling said waveforms to be compared to determine a phase shift between said waveforms; and
identifying when said phase shift is deemed acceptable due to adjustment of said positioning.
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Abstract
In one aspect, a conductance catheter is provided for measuring the volume of a fluid. The conductance catheter comprises a series of electrodes and a circuit to compensate for variations in sensitivity of the electrodes in the catheter. In another aspect, a resistivity sensor is provided for determining the resistivity of a fluid. The sensor comprises a series of electrodes spaced such that the total distance between endmost electrodes does not exceed the diameter of the catheter deploying the sensor.
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Citations
10 Claims
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1. A method for positioning a sensing tip disposed in a ventricle, the method comprising:
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obtaining an excitation waveform generated by one pair of electrodes disposed on said sensing tip; obtaining a conductance waveform sensed by another pair of electrodes disposed on said sensing tip; enabling said waveforms to be compared to determine a phase shift between said waveforms; and identifying when said phase shift is deemed acceptable due to adjustment of said positioning. - View Dependent Claims (2, 3, 4, 5)
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6. A non-transitory computer readable medium for facilitating positioning a sensing tip disposed in a ventricle, the computer readable medium comprising computer executable instructions for:
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obtaining an excitation waveform generated by one pair of electrodes disposed on said sensing tip; obtaining a conductance waveform sensed by another pair of electrodes disposed on said sensing tip; enabling said waveforms to be compared to determine a phase shift between said waveforms; and identifying when said phase shift is deemed acceptable due to adjustment of said positioning. - View Dependent Claims (7, 8, 9, 10)
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Specification