Cryotherapy Balloon Catheter Pressure Regulation
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Solution Overview
Problem
Current cryotherapy procedures for treating atrial fibrillation using cryotherapy balloon catheters face challenges in maintaining constant pressure during treatment phases, which can lead to the balloon dislodging from the treatment site, especially in moving tissues like pulmonary veins during heartbeats.
Innovation Solution
The cryotherapy balloon catheter employs a dual-phase procedure with controlled flow rates of cryogenic fluid and exhaust to maintain a substantially constant pressure within the balloon, using the Joule-Thomson effect to cool the tissue, and includes a controller to regulate these flows, ensuring the balloon remains securely positioned by keeping pressure variations minimal between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a larger volume of cryogenic fluid is delivered to cool the tissue, then the therapeutic cooling effect is improved, but the pressure inside the balloon varies causing dislodgment from the treatment site
Solution Approach 1:
The system employs a controller that receives feedback from pressure sensors monitoring the balloon's internal pressure. When pressure deviations are detected that could cause dislodgment, the controller automatically adjusts the cryogenic fluid flow rate through control valves to maintain pressure within a safe range, thereby resolving the contradiction between achieving therapeutic cooling and maintaining stable positioning.
Solution Approach 2:
The system dynamically adjusts the cryogenic fluid delivery rate based on real-time pressure conditions. During phases when cooling is prioritized, higher flow rates are permitted within safe pressure limits. When pressure approaches dislodgment thresholds, the system automatically reduces flow rate, creating a dynamic balance between cooling efficacy and positional stability.
2Stability of the object's composition
If the balloon is pressed against body tissue with high pressure to prevent dislodgment, then the balloon position stability is improved, but the risk of tissue damage increases
Solution Approach 1:
Pressure sensors continuously monitor both the balloon's internal pressure and the contact pressure against the tissue. The controller uses this feedback to maintain pressure within an optimal range that prevents dislodgment while staying below thresholds that could cause tissue damage, thus resolving the contradiction between stability and safety.
Solution Approach 2:
The system changes the pressure parameter dynamically throughout the treatment procedure. During initial positioning, higher pressures are applied to ensure secure placement. During the cooling phase, pressure is maintained within a narrower, safer range to prevent tissue damage while still preventing dislodgment, achieving both stability and safety through parameter optimization.
3Manufacturing precision
If the treatment time is extended to achieve deeper tissue ablation, then the therapeutic effect is improved, but the risk of excessive tissue damage increases
Solution Approach 1:
Temperature sensors monitor the tissue temperature in real-time during the cooling and ablation process. The controller uses this feedback to terminate the treatment when predefined temperature-time thresholds are reached, ensuring sufficient ablation depth while preventing excessive tissue damage. This feedback mechanism resolves the contradiction between achieving therapeutic depth and avoiding harm.
Solution Approach 2:
The treatment is conducted in controlled phases with periodic monitoring of temperature and pressure parameters. The system allows treatment to proceed through defined stages (positioning, cooling, ablation) with automatic transitions based on sensor feedback, ensuring that each phase achieves its therapeutic goal without exceeding safety limits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively maintains the balloon's position during treatment, preventing dislodgment and ensuring consistent therapeutic cooling of the tissue, allowing for efficient ablation of pulmonary vein tissue to a depth of 5 mm within five minutes while minimizing tissue damage.
Implementation Method 1
A small volume of cryogenic fluid can be delivered to inflate the balloon portion against body tissue that is to be treated during a second phase of cryotherapy. cryogenic fluid can be delivered to the balloon portion through a supply lumen, and released inside the balloon portion, where it undergoes a phase change that cools the balloon portion by the Joule-Thomson effect
Data Source
AI summary
A method of performing a cryotherapy procedure can include introducing a cryotherapy balloon catheter at a treatment site inside a patient's body; regulating, during a first phase of a cryotherapy procedure, flow of cryogenic fluid to and exhaust from a distal balloon portion of the cryotherapy balloon catheter to cause an initial pressure to be maintained inside the distal balloon portion that is sufficiently high to cause an outer wall of the distal balloon portion to be pressed against body tissue at the treatment site; and regulating, during a second phase of the cryotherapy procedure, flow of cryogenic fluid to and exhaust from the distal balloon portion to cause a) a temperature inside the distal balloon portion to reach a value sufficient to deliver therapeutic levels of cryotherapy to the body tissue, and b) a second-phase pressure to be maintained that is within a threshold value of the initial pressure.