Control system and process for application of energy to airway walls and other mediums
First Claim
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1. A system for delivering energy to a medium, comprising:
- an expandable member including a plurality of energy delivery elements spaced 90 degrees from one another about a longitudinal axis of the expandable member, wherein a first energy delivery element of the plurality of energy delivery elements includes an exposed active region defined at first and second ends by insulating material, and the plurality of energy delivery elements includes exactly four energy delivery elements;
at least one temperature sensor for measuring a temperature (TM) of the medium or at least one of the energy delivery elements when energy is delivered to the medium;
a PID controller for determining a new power set point (Pi+1) based on an error at a present time step (ei) between a preset temperature (TS) and the measured temperature (TM), and an error at a previous time step (ei−
1) between the preset temperature (TS) and the measured temperature (TM), wherein the PID controller is configured to terminate energy delivery when the measured temperature does not increase by at least 10°
C. in an initial 3 seconds from an initiation of energy delivery.
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Abstract
The present disclosure may include a system for delivering energy to an airway wall of a lung comprising an energy delivering apparatus and a PID controller having one or more variable gain factors. The energy delivering apparatus may include a flexible elongated member and a distal expandable basket having at least one electrode for transferring energy to the airway wall and at least one temperature sensor for measuring temperature.
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Citations
20 Claims
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1. A system for delivering energy to a medium, comprising:
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an expandable member including a plurality of energy delivery elements spaced 90 degrees from one another about a longitudinal axis of the expandable member, wherein a first energy delivery element of the plurality of energy delivery elements includes an exposed active region defined at first and second ends by insulating material, and the plurality of energy delivery elements includes exactly four energy delivery elements; at least one temperature sensor for measuring a temperature (TM) of the medium or at least one of the energy delivery elements when energy is delivered to the medium; a PID controller for determining a new power set point (Pi+1) based on an error at a present time step (ei) between a preset temperature (TS) and the measured temperature (TM), and an error at a previous time step (ei−
1) between the preset temperature (TS) and the measured temperature (TM), wherein the PID controller is configured to terminate energy delivery when the measured temperature does not increase by at least 10°
C. in an initial 3 seconds from an initiation of energy delivery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for delivering energy to a medium, comprising:
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an energy source configured to generate radiofrequency energy; an expandable basket including a plurality of radiofrequency electrodes disposed about a longitudinal axis of the expandable basket, wherein one or more of the plurality of radiofrequency electrodes are coupled to a first pole of the energy source; an external electrode coupled to a second pole of the energy source, the second pole being opposite the first pole; at least one temperature sensor for measuring temperature (TM) of the medium or a radiofrequency electrode of the plurality of radiofrequency electrodes when energy is delivered to the medium; and a PID controller for determining a new power set point (Pi+1) based on an error (e) between a preset temperature (TS) and the measured temperature (TM), wherein the controller is configured to terminate the energy delivery if the output power is greater than or equal to a nominal output power and the TM drops by a critical temperature difference within a sampling period, and is configured to terminate energy delivery when the measured temperature changes by at least 10°
C. in a time period from 0.1 to 1 seconds at any point during energy delivery. - View Dependent Claims (15, 16, 17, 18)
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19. A system for delivering energy to a medium, comprising:
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a treatment device including a basket having a plurality of radiofrequency electrodes circumferentially spaced about a longitudinal axis of the treatment device for delivering energy to the medium, the plurality of electrodes converging at a distal tip, at least one of the radiofrequency electrodes including an exposed electrically conductive portion extending from a first end toward a second end; a first nonconductive region coupled to the first end of the exposed electrically conductive portion; a second nonconductive region coupled to the second end of the exposed electrically conductive portion; a member extending from proximal of a proximal end of the basket, through an interior volume defined by the plurality of radiofrequency electrodes, to the distal tip, wherein applying a proximal pulling force on the member causes the plurality of radiofrequency electrodes to radially expand, and releasing the proximal pulling force causes the plurality of radiofrequency electrodes to radially contract, and the member is configured to deliver current to each of the plurality of radiofrequency electrodes; and at least one temperature sensor for measuring temperature (TM) of the medium or the at least one radiofrequency electrode when energy is delivered to the medium; a PID controller for determining a new power set point (Pi+i) based on an error (e) between a preset temperature (TS) and the measured temperature (TM); and wherein the controller is configured to terminate the energy delivery if the TM averaged over a time window exceeds TS by a fixed temperature difference, and is configured to terminate energy delivery when the measured temperature changes by at least 10°
C. in a time period from 0.1 to 1 seconds at any point during energy delivery. - View Dependent Claims (20)
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Specification