Efficient controlled cryogenic fluid delivery into a balloon catheter and other treatment devices
First Claim
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1. A system for cryogenic treatment of tissue, the system comprising:
- a controller, the controller comprising;
a pulse width scan module, the pulse width scan module configured to implement a pulse width scan, the pulse width scan determining a command pulse width;
a treatment protocol module, the treatment protocol module configured to establish a treatment protocol based on the command pulse width received from the pulse width scan module;
a treatment implementation module, the treatment implementation module configured to effect a desired cryogenic tissue treatment, the treatment implementation module in communication with the treatment protocol module;
a fluid path, the fluid path extending from a reservoir of fluid to a balloon of a balloon catheter and then to an exhaust lumen;
a solenoid, the solenoid controlling flow of fluid along the fluid path from the reservoir of fluid to the balloon, the solenoid in communication with the controller;
wherein the command pulse width comprises a minimum measured pulse width of the solenoid anda pressure sensor, the pressure sensor monitoring pressure of the fluid in the exhaust lumen, the pressure sensor in communication with the controller.
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Abstract
Devices, systems, and methods efficiently dilate and/or cool blood vessels and other body tissues. Controlled cooling with balloon catheters and other probes may be effected by a change in phase of a cryogenic fluid, often after measuring a minimum pulse width for actuating an individual solenoid valve along the cooling fluid path, with the measured pulse width allowing gradual inflation of a balloon without excessive venting of cooling fluid.
46 Citations
20 Claims
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1. A system for cryogenic treatment of tissue, the system comprising:
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a controller, the controller comprising; a pulse width scan module, the pulse width scan module configured to implement a pulse width scan, the pulse width scan determining a command pulse width; a treatment protocol module, the treatment protocol module configured to establish a treatment protocol based on the command pulse width received from the pulse width scan module; a treatment implementation module, the treatment implementation module configured to effect a desired cryogenic tissue treatment, the treatment implementation module in communication with the treatment protocol module; a fluid path, the fluid path extending from a reservoir of fluid to a balloon of a balloon catheter and then to an exhaust lumen; a solenoid, the solenoid controlling flow of fluid along the fluid path from the reservoir of fluid to the balloon, the solenoid in communication with the controller;
wherein the command pulse width comprises a minimum measured pulse width of the solenoid anda pressure sensor, the pressure sensor monitoring pressure of the fluid in the exhaust lumen, the pressure sensor in communication with the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for cryogenic treatment of tissue, the system comprising:
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a fluid path, the fluid path extending from a reservoir of fluid to a balloon of a balloon catheter and then to an exhaust lumen; a solenoid, the solenoid controlling flow of fluid along the fluid path from the reservoir of fluid to the balloon; a pressure sensor, the pressure sensor monitoring pressure of the fluid in the exhaust lumen; a controller in communication with the solenoid and the pressure sensor, the controller comprising; a pulse width scan module configured to determine a minimum electrical pulse for the solenoid in situ; a treatment protocol module configured to establish a treatment protocol based on the minimum electrical pulse determined by the pulse width scan module; a treatment implementation module to implement the treatment protocol, the treatment implementation module in communication with the treatment protocol module.
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Specification