Medical device inline degasser
An apparatus for degassing a coupling fluid for use with a high intensity ultrasound system is disclosed. The apparatus has a fluid circuit having a vacuum chamber, a circulating pump, a vacuum pump and optional sensors for detecting one or more fluid parameters, such as dissolved gases. The coupling fluid may also serve as a coolant for a HIFU transducer.
1 . A system for coupling a high intensity focused ultrasound transducer to a patient comprising:
a circuit for conveying a coupling fluid;
pump for circulating coupling fluid through the circuit;
a vacuum chamber connected to apply a pressure gradient to said circuit such that dissolved gasses are drawn out of said coupling fluid; and
a coupling reservoir connected to said circuit for coupling a transducer to a patient.
2 . The system as described in claim 1 further comprising a chiller on said circuit for cooling said coupling fluid.
3 . The system as described in claim 1 , wherein said vacuum chamber comprises one or more gas permeable membranes through which gas may be drawn from said fluid.
4 . The system as described in claim 1 , wherein the pump is also connected to draw a vacuum in the vacuum chamber.
5 . The system as described in claim 1 , further comprising a control device for adjusting said circulation pump.
6 . The system as described in claim 1 , further comprising one or more sensors.
7 . The system of claim 6 , wherein said one or more sensors are in electronic communication with said control device.
8 . The system as described in claim 6 , wherein said sensor(s) capable of reporting information to an operator.
9 . The system of claim 1 , wherein said fluid is a coolant for controlling the temperature of a transducer.
10 . The system of claim 1 , further comprising a storage tank located on said circuit.
11 . The system of claim 1 , further comprising a means for reducing pressure and volume fluctuations.
12 . The system as described in claim 1 , having one or more valves in said circuit.
13 . The system as described in claim 1 , wherein said fluid is water.
14 . An apparatus for performing high intensity focused ultrasound (HIFU) procedures, the apparatus comprising:
a first housing having a high intensity focused ultrasound (HIFU) transducer;
a second housing having system electronics for controlling said transducer, a user interface, a display and a power supply; and
a system for circulating a degassed coupling fluid wherein said coupling fluid is circulated between said first housing and said second housing and said first housing and said second housing are in electronic communication.
15 . The apparatus as described in claim 14 , wherein said system for circulating a degassed coupling fluid further comprises one or more sensors in electronic communication with said system electronics, and said system electronics able to operate as a controller for said system for circulating a degassed coupling fluid.
16 . The apparatus as described in claim 14 , wherein the system for circulating a degassed coupling fluid is a cooling system for dissipating heat from said high intensity focused ultrasound (HIFU) transducer.
17 . A method for performing ultrasound therapy, said method comprising:
applying an ultrasound transducer to a tissue surface of the patient;
energizing the transducer to emit ultrasonic energy to the patient;
circulating a coupling fluid to the transducer; and
applying a vacuum to the circulating coupling fluid to degas said fluid.