Indirect fluid flow measurement
AssigneeBoston Scientific Scimed, Inc.
InventorsRobert J. Bouthillier, Curtis Jarva, Stephen S. Keaney, Boris Shapeton, Jorah Wyer
Life of this patent
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Abstract
A method for ablating tissue comprising controlling a heating element using a variable phase angle control to heat an ablation fluid to a desired temperature and determining a heating percentage corresponding to a percentage of a maximum available heating power represented by a current level of power supplied to the heating element and, when the heating percentage remains below a threshold level for a predetermined period of time, indicating a flow obstruction condition of the fluid.
Claims16
A method for ablating tissue, comprising:
- controlling a heating element using a variable phase angle control to heat an ablation fluid to a desired temperature;
- and
- determining a heating percentage corresponding to a percentage of a maximum available heating power represented by a current level of power supplied to the heating element and, when the heating percentage remains below a threshold level for a predetermined period of time, indicating a flow obstruction condition of the fluid.
A system for thermal ablation, comprising:
- a heating element heating an ablation fluid;
- and
- a computing arrangement controlling power supplied to the heating element based on a proportional, integral and derivative (PID) algorithm, the computing arrangement monitoring power required by the heating element to sustain a desired temperature of the ablation fluid and executing a safety procedure when the power supplied to the heating element over a predetermined period of time drops below a threshold level.
A system for thermal ablation, comprising:
- a heating element heating an ablation fluid;
- and
- a controller coupled to the heating element, the controller adjusting an amount of power supplied to the heating element using a variable phase angle control to heat the ablation fluid to a desired temperature, the controller determining a heating percentage corresponding to a percentage of a maximum available heating power represented by an amount of power currently supplied to the heating element wherein, when the heating percentage remains below a threshold level for a predetermined period of time, the controller indicates a flow obstruction condition of the ablation fluid.
Dependencies are inferred from the claim text.