Back to results
US 9,867,648 B2Granted
Method and system for consistent, repeatable, and safe cryospray treatment of airway tissue
AssigneeCSA Medical, Inc.
InventorsThomas Mulcahey, Marc Davidson, Brian M. Hanley, Ellen Sheets, Wei Li Fan
Life of this patent
Estimating the term…
Abstract
A method and system for automated and semi-automated predictable, consistent, safe, effective, and lumen-specific and patient-specific cryospray treatment of airway tissue in which treatment duration is automatically set by the system following entry of patient information and treatment location information into the system by the user, and treatment spray is automatically stopped by the system when the automatically selected treatment duration has been achieved as determined by the system.
Claims17
A system comprising:
- a cryogen tank in fluid communication with a cryogen delivery device;
- one or more adjustable pressure valves configured to adjust a pressure of the cryogen tank in response to a control signal;
- and
- a controller configured to:
- receive an indication of a target pressure,
- measure the pressure of the cryogen tank during an operation of the cryogen delivery device,
- determine whether the measured pressure matches the target pressure,
- determine a current rate of change of pressure of the cryogen tank,
- adjust the control signal based on the measuring of the pressure of the cryogen tank, the target pressure, the current rate of change of pressure of the cryogen tank, and a pressure history of the cryogen tank;
- and
- adjust the pressure of the cryogen tank towards the target pressure via the one or more adjustable pressure valves in response to the control signal.
8 more elements
A system comprising:
- a cryospray delivery device operable in a test mode and a normal mode;
- a cryogen tank;
- an adjustable pressure valve disposed between the cryospray delivery device and the cryogen tank;
- and
- a controller configured to perform the following actions when the cryospray delivery device is operated in the test mode:
- measure a cooling power of the cryospray delivery device,
- determine a current rate of change of pressure of the cryogen tank,
- adjust the adjustable pressure valve in response to the measured cooling power, wherein the controller adjusts the adjustable pressure valve based on the current rate of change of pressure of the cryogen tank, a pressure history, and a pressure set point, and
- re-test the system until a desired cooling power is achieved at the cryospray delivery device.
6 more elements
A system comprising:
- a cryogen tank in fluid communication with a cryogen delivery device;
- one or more adjustable pressure valves configured to adjust a pressure of the cryogen tank in response to a control signal;
- and
- a controller configured to:
- identify a target cooling power of the cryogen delivery device,
- initiate an operation of the cryogen delivery device,
- measure a cooling power of the cryogen delivery device,
- determine a current rate of change of pressure of the cryogen tank,
- adjust the pressure of the cryogen tank until the cooling power matches the target cooling power, wherein the controller is configured to adjust the pressure based on the current rate of change of pressure of the cryogen tank, a pressure history, and a pressure set point;
- record the pressure of the cryogen tank when the cooling power matches the target cooling, and
- use the recorded pressure as a target pressure during a future operation of the cryogen delivery device.
8 more elements
Dependencies are inferred from the claim text.