System and method for optimized delivery of an aerosol to the respiratory tract

• US 20070157931A1
• Filed: 07/11/2006
• Published: 07/12/2007
• Est. Priority Date: 07/11/2005
• Status: Abandoned Application

• Current Assignee: Emory University
• Original Assignee: Emory University
• Inventors: Parker, Richard, Sanders, Robby
• Application Number:
  US11/484,920
• Publication Number:
  US 20070157931A1
• Time in Patent Office: Days
• US Class Current: 128/204.230
• CPC Class Codes: A61M 11/005 using ultrasonics spraying or atomising liquids using ultrasonic vibrations in general B05B17/06
• CPC Class Codes: A61M 15/0083 Timers
• CPC Class Codes: A61M 15/0085 using ultrasonics spraying or atomising liquids using ultrasonic vibrations in general B05B17/06
• CPC Class Codes: A61M 15/009 using medicine packages with incorporated spraying means, e.g. aerosol cans pocket atomiser of the injector type A61M11/08
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/026 specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
• CPC Class Codes: A61M 16/14 by mixing different fluids, one of them being in a liquid phase
• CPC Class Codes: A61M 2205/3561 local, e.g. within room or hospital
• CPC Class Codes: A61M 2205/3569 sublocal, e.g. between console and disposable
• CPC Class Codes: A61M 2205/3592 using telemetric means, e.g. radio or optical transmission
• CPC Class Codes: A61M 2205/50 with microprocessors or computers

Abstract

The present disclosure relates to systems, methods, and devices for controlling delivery of aerosolized formulations to patients in need of treatment, which optimizes aerosol deposition to the respiratory tract of the patient and can be adapted for use in spontaneously breathing patients or in those requiring mechanical ventilation.

Claims

1. A system for delivery of an aerosolized formulation to the respiratory tract of a host, comprising:

an inspiration sensor operative to perform one or more of the following functions;

detect an initiation of respiration, detect a cessation of inspiration, detect a flow rate, and calculate a volume of a gas flowing past the inspiration sensor;

an aerosol generator operative to aerosolize and release a formulation to be delivered to the respiratory tract of the human or animal;

a computer system including an aerosol controller system and in communication with the inspiration sensor and the aerosol generator and operative to perform the following functions;

i. receive information from the inspiration sensor;

ii. process information received from the inspiration sensor and determine at least one respiration parameter;

iii. determine the desired time during a respiration cycle for initiation and cessation of aerosol release based upon one or more respiration parameters and on one or more delivery parameters, wherein the delivery parameters include inputted delivery parameters and calculated delivery parameters, and wherein the computer system determines calculated delivery parameters based on one or more respiration parameters and optionally one or more inputted delivery parameters;

iv. communicate with the aerosol generator to activate and terminate the release of aerosolized formulation;

v. repeat steps i through iv and automatically adjust for any changes in the respiration parameters or delivery parameters; and

vi. repeat i through v until a desired amount of formulation has been delivered.

2. The system of claim 1, wherein the respiration parameters comprise at least one parameter selected from the following:

a length of a respiration cycle, a length of inspiration, a volume of a gas flowing past the inspiration sensor, a peak inspiratory pressure, and a tidal volume.

3. The system of claim 1, wherein the inputted delivery parameters comprise at least one parameter selected from the following:

a patient-specific parameter, a formulation-specific parameter, an airway connection-specific parameter, an estimated dead-space, an estimated chase volume, an estimated gas velocity, an estimated start and stop time for aerosol generation, a specified length of time to complete delivery of a desired volume of formulation, a dosing protocol, and a delivery efficiency setting.

4. The system of claim 1, wherein the calculated delivery parameters comprise one or more of the following:

a calculated dead space, a calculated chase volume, a calculated gas velocity, a calculated particle size, and a calculated start and stop time for aerosol generation.

5. The system of claim 1, wherein the aerosol generator is a metered dose inhaler or a nebulizer.

6. The system of claim 5, wherein the nebulizer is a jet nebulizer or a vibrating mesh nebulizer (should other types be listed?).

7. The system of claim 1, wherein the inspiration sensor is a gas flow sensor.

8. The system of claim 1, further comprising a waste sensor operative to detect an amount of waste, wherein the waste sensor is in communication with the computer system and the computer system receives information from the waste sensor, processes information received from the waste sensor and determines a waste percentage, and automatically adjusts the timing of initiation and cessation of aerosol release if the waste percentage exceeds a pre-determined waste tolerance threshold.

9. The system of claim 8, wherein the pre-determined waste tolerance threshold is between about 0 and 20 percent.

10. The system of claim 8, wherein the waste is selected from one or more of the following types of waste:

exhaled waste, wrap-around waste, rain-out waste, and sputter-volume.

11. The system of claim 1, wherein the system is adapted for use with a ventilator.

12. The system of claim 1, wherein the system is adapted for use with a portable metered dose inhaler.

13. The system of claim 1, wherein the aerosolized formulation is a respiratory drug.

14. The system of claim 1, wherein the aerosolized formulation is a drug for treatment of a systemic illness.

15. The system of claim 1, wherein the aerosolized formulation comprises genetic material.

16. The system of claim 1, wherein the aerosolized formulation comprises an imaging composition selected from at least one of:

radioisotopes, contrast agents, and labeled pharmaceutical compositions.

17. The system of claim 1, wherein the aerosolized formulation comprises a pulmonary surfactant.

18. The system of claim 1, wherein the computer system automatically records and logs the respiration parameters for a number of consecutive respiration cycles, calculates average respiration parameters from the recorded respiration parameters, and determines the desired time for initiation and cessation of aerosol release based at least in part on the calculated average respiration parameters.

19. The system of claim 18, wherein the computer system calculates average respiration parameters from the recorded respiration parameters of a certain number of respiration cycles having respiration parameters within a determined percentage of one another.

20. The system of claim 18, wherein the computer system continuously re-calculates the average respiration parameters based on new information received from the inspiration sensor to obtain adjusted average respiration parameters, and uses the adjusted average respiration parameters to adjust calculated delivery parameters and to adjust the desired time for initiation and cessation of aerosol release to accommodate for the adjusted average respiration parameters.

21. The system of claim 3, wherein the patient-specific parameters are selected from one or more of the following:

a height, a weight, an age, a gender, a desired location in respiratory tract for delivery of the aerosolized particles, a respiratory condition, and an estimated tidal volume.

22. The system of claim 3, wherein the formulation-specific parameters are selected from one or more of the following:

a volume of a formulation to be delivered, a type of formulation to be delivered, a pre-determined size of particles of the aerosolized formulation, a pre-determined gas velocity of the aerosolized formulation.

23. The system of claim 3, wherein the airway connection-specific parameters are selected from one or more of the following:

an airway connection tube diameter, and an airway connection tube volume.

24. The system of claim 1, further comprising an efficiency controller operative to select a desired efficiency setting.

25. The system of claim 1, wherein the system is able to monitor and deliver more than one different type of formulation, wherein the calculated delivery parameters for each formulation may be different.

26. A system for delivery of an aerosolized formulation to the respiratory tract of a ventilated host, comprising:

a ventilator, to which the ventilated host is attached;

an inspiration sensor in communication with an inspiratory pathway of the ventilator and operative to perform one or more of the following functions;

detect an initiation of respiration, detect a cessation of inspiration, detect a flow rate, and calculate a volume of a gas flowing past the inspiration sensor;

an aerosol generator operative to aerosolize and release a formulation to be delivered to the respiratory tract of the host, wherein said aerosol generator is in communication with the inspiratory pathway of the ventilator to allow release of the aerosolized formulation from the aerosol generator into the inspiratory pathway;

a waste sensor in communication with an expiratory pathway of the ventilator operative to detect an amount of exhaled waste;

a computer system in communication with the inspiration sensor, waste sensor, and the aerosol generator operative to perform the following functions;

i. receive information from the inspiration sensor and the waste sensor;

ii. process information received from the inspiration sensor and determine at least one respiration parameter;

iii. process information received from the waste sensor and determine a waste percentage;

iv. determine a desired time during a respiration cycle for initiation and cessation of aerosol release based upon one or more respiration parameters and on one or more delivery parameters, wherein the delivery parameters include inputted delivery parameters and calculated delivery parameters, and wherein the computer system determines calculated delivery parameters based on one or more respiration parameters and optionally one or more inputted delivery parameters and optionally the waste percentage;

v. communicate with the aerosol generator to activate and terminate the release of aerosolized formulation;

vii. repeat steps i through v and automatically adjust for any changes in the respiration parameters or delivery parameters; and

viii. repeat steps i through vii until a desired amount of formulation has been delivered.

27. A method for optimizing delivery of an aerosolized formulation to the respiratory tract of a human or animal, comprising:

a. detecting respiration data;

b. determining respiration parameters from respiration data;

c. determining calculated delivery parameters from respiration data and one or more inputted delivery parameters;

d. determining the desired time during a respiration cycle for initiation and cessation of aerosol release based upon one or more respiration parameters and on one or more calculated delivery parameters;

e. communicating with an aerosol generator to activate and terminate the release of aerosolized formulation;

f. repeating steps a through e and adjusting for any changes in the respiration parameters or delivery parameters; and

g. repeating a through f until a desired amount of formulation has been delivered.

28. The method of claim 27, wherein the respiration data includes at least one of the following:

a time of initiation of inspiration, a time of cessation of inspiration, a rate of a gas being inhaled, and a volume of a gas being inhaled.

29. The method of claim 27, wherein inputted delivery parameters are selected from one or more of the following parameters:

a patient-specific parameter, a formulation-specific parameter, an airway connection-specific parameter, a dosing protocol, a specified length of time to complete delivery of a desired volume of formulation, and a delivery efficiency setting

30. The method of claim 27, wherein the respiration parameters comprise at least one parameter selected from the following:

A length of a respiration cycle, a length of inspiration, a peak inspiratory pressure, and a tidal volume.

31. The method of claim 27, wherein the calculated delivery parameters comprise one or more of the following:

a calculated dead space, a calculated chase volume, a calculated gas velocity, a calculated particle size, and a calculated start and stop time for aerosol generation.

32. The method of claim 27, further comprising the following steps:

a. detecting an amount of waste,

b. determining a waste percentage, and

c. re-calculating one or more calculated delivery parameters

if the waste percentage exceeds a pre-determined waste tolerance threshold.

33. The method of claim 32, wherein the pre-determined waste tolerance threshold is between about 0 and 20 percent.

34. The method of claim 32, wherein the waste is selected from one or more of the following types of waste:

exhaled waste, wrap-around waste, rain-out waste, and sputter-volume.

35. The method of claim 27, wherein the patient-specific parameters are selected from one or more of the following:

a height, a weight, an age, a gender, a desired location in respiratory tract for delivery of the aerosolized particles, a respiratory condition, and an estimated tidal volume.

36. The method of claim 27, wherein the formulation-specific parameters are selected from one or more of the following:

a volume of a formulation to be delivered, a type of formulation to be delivered, a pre-determined size of particles of the aerosolized formulation, a pre-determined gas velocity of the aerosolized formulation.

37. The method of claim 27, wherein the airway connection-specific parameters are selected from one or more of the following:

an airway connection tube diameter, and an airway connection tube volume.

38. The method of claim 27, wherein the determining respiration parameters from respiration data includes recording and logging the respiration parameters for a number of consecutive respiration cycles, calculating average respiration parameters from the recorded respiration parameters, and wherein determining the desired time for initiation and cessation of aerosol release is based at least in part on the calculated average respiration parameters.

39. The method of claim 37, wherein the average respiration parameters are calculated from the recorded respiration parameters of a certain number of respiration cycles having respiration parameters within a determined percentage of one another.

40. The method of claim 37, further comprising continuously re-calculating the average respiration parameters based on continuously acquired respiration data to obtain adjusted average respiration parameters, and using the adjusted average respiration parameters to adjust calculated delivery parameters and to adjust the desired time for initiation and cessation of aerosol release to accommodate for the adjusted average respiration parameters.

41. A method for optimizing delivery of an aerosolized formulation to the respiratory tract of a human or animal, comprising:

a. acquiring inputted delivery parameters, wherein inputted delivery parameters are selected from one or more of the following parameters;

a patient-specific parameter, a formulation-specific parameter, an airway connection-specific parameter, an estimated start and stop time for aerosol generation, a specified length of time to complete delivery of a desired volume of formulation, and a delivery efficiency setting;

b. determining calculated delivery parameters from one or more inputted delivery parameters;

c. determining the desired time during a respiration cycle for initiation and cessation of aerosol release based upon one or more calculated delivery parameters;

d. communicating with an aerosol generator to activate and terminate the release of aerosolized formulation;

e. detecting an amount of waste selected from wrap-around waste and exhaled waste;

f. adjusting calculated delivery parameters with respect to the amount of waste detected;

g. repeating steps a through f and automatically adjusting for any changes in the amount of waste detected or the delivery parameters; and

h. repeating a through g until a desired amount of formulation has been delivered.

43. The system of claim 41 further comprising a processor configured to execute the aerosol controller logic of claim 41.

44. The system of claim 41, wherein the aerosol controller logic is stored on a computer readable medium.

45. The system of claim 41, wherein the aerosol controller logic comprises software, hardware, or a combination of software and hardware.

42. A system comprising:

an aerosol controller logic configured to;

determine a desired time during a respiration cycle for initiation and cessation of aerosol generation based upon one or more calculated delivery parameters calculated from one or more respiration parameters and one or more inputted delivery parameters, and optionally a waste percentage; and

automatically adjust the desired time for initiation and cessation of aerosol generation based upon any changes in calculated delivery parameters.