Control system and process for application of energy to airway walls and other mediums
First Claim
1. A method for treating a lung by transferring energy from an active region of an energy delivery apparatus to an airway wall of said lung, said energy delivery apparatus having a flexible elongate body and a distal section and said active region being located in said distal section, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said airway wall, said method comprising:
- setting a preset temperature (Ts);
determining a power set point (Pi) to deliver energy from said active region to said target medium;
measuring said TM using said temperature sensor;
determining a new power set point (Pi+1) based on an error (e) between said preset temperature (Ts) and said measured temperature (TM) using a PID algorithm; and
terminating said energy delivery when the temperature does not rise a predetermined amount in a specified period of time.
5 Assignments
0 Petitions
Accused Products
Abstract
The present invention includes 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 which are rest after energy deliver has begun. 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. The PID controller determines a new power set point base on an error between a preset temperature and the measured temperature. The algorithm can be Pi+1=Pi+G(αei+βei−1+γei−2) where α, β and γ are preset values and α is from 1 to 2; β is from −1 to −2; and γ is from −0.5 to 0-5. In another variation, the controller is configured to shut down if various measured parameters are exceeded such as, for example, energy, impedance, temperature, temperature differences, activation time and combinations thereof. Methods for treating a target medium using a PID algorithm are also provided.
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Citations
53 Claims
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1. A method for treating a lung by transferring energy from an active region of an energy delivery apparatus to an airway wall of said lung, said energy delivery apparatus having a flexible elongate body and a distal section and said active region being located in said distal section, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said airway wall, said method comprising:
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setting a preset temperature (Ts); determining a power set point (Pi) to deliver energy from said active region to said target medium; measuring said TM using said temperature sensor; determining a new power set point (Pi+1) based on an error (e) between said preset temperature (Ts) and said measured temperature (TM) using a PID algorithm; and terminating said energy delivery when the temperature does not rise a predetermined amount in a specified period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for transferring energy to a target medium using an energy delivery apparatus, said energy delivery apparatus having a flexible elongate body and a distal section wherein said distal section includes an expandable basket with at least one active region for transferring energy to said target medium, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said target medium, said process comprising:
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setting a preset temperature (Ts); determining a power set point (Pi) to deliver energy from said active region to said target medium; measuring said TM using said temperature sensor; determining a new power set point (Pi+1) based on an error (e) between said preset temperature (Ts) and said measured temperature (TM) using an algorithm having a variable gain factor, wherein said algorithm is; Pi +1=Pi+G(α
ei+β
ei-1+γ
ei-2) where α
, β and
γ
are preset values, and wherein at least one of α
, β and
γ
is from −
0.5 to 0.5. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A process for transferring energy to a target medium using an energy delivery apparatus, said energy delivery apparatus having a flexible elongate body and a distal section wherein said distal section includes an expandable basket with at least one active region for transferring energy to said target medium, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said target medium, said process comprising:
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setting a preset (Ts); determining a power set point (Pi) to deliver energy from said active region to said target medium; measuring said TM using said temperature sensor; determining a new power set point (Pi+1 )based on an error (e) between said preset temperature (Ts) and said measured temperature(TM) using an algorithm having a variable gain factor; and terminating said energy delivery if an output power is greater or equal to a nominal output power and said TM drops by a critical temperature difference within a sampling period. - View Dependent Claims (36, 37, 38)
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39. A process for transferring energy to a target medium using an energy delivery apparatus, said energy delivery apparatus having a flexible elongate body and a distal section wherein said distal section includes an expandable basket with at least one active region for transferring energy to said target medium, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said target medium, said process comprising:
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setting a preset(Ts); determining a power set point (Pi)to deliver energy from said active region to said target medium; measuring said TM using said temperature sensor; determining a new power set point (Pi+1)based on an error (e) between said preset temperature (TS) and said measured temperature (TM)using an algorithm having a variable gain factor; and terminating said energy delivery if said TM averaged over a time window exceeds TS by a fixed temperature difference. - View Dependent Claims (40, 41, 42, 43)
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44. A process for transferring energy to a target medium using an energy delivery apparatus, said energy delivery apparatus having a flexible elongate body and a distal section wherein said distal section includes an expandable basket with at least one active region for transferring energy to said target medium, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said target medium, said process comprising:
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setting temperature (Ts); determining a power set point (Pi) to deliver energy from said active region to said target medium; measuring said TM using said temperature sensor; determining a new power set point (Pi+1) based on an error (e) between said preset temperature (Ts) and said measured temperature (TM) using an algorithm having a variable gain factor; and wherein said algorithm is Pi+1=Pi+(G1ei+G2ei-1+G3ei-2) where G1, G2 and G3 are variable gain factors. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. A method for treating a lung by transferring energy from an active region of an energy delivery apparatus to an airway wall of said lung, said energy delivery apparatus having a flexible elongate body and a distal section and said active region being located in said distal section, said energy delivery apparatus further having a temperature sensor located in said distal section for measuring a temperature (TM) of said airway wall, said method comprising:
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setting a preset temperature (Ts); determining a power set point (Pi) to deliver energy from said active region to said target medium; delivering energy from the energy delivery apparatus to the airway wall during an energy delivery phase; measuring said TM using said temperature sensor; determining a new power set point (Pi+1) based on an error (e) between said preset temperature (Ts) and said measured temperature (TM) using a PID algorithm; and terminating said energy delivery when the temperature ramp rate is not within a predetermined range at a selected portion of the energy delivery phase. - View Dependent Claims (53)
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Specification