Offset Balloon Heat Exchange Catheter for Urethral Warming
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Solution Overview
Problem
Existing urethral warming catheters during cryosurgical procedures for prostate treatment suffer from uneven heating due to heat loss along the catheter length, leading to inadequate protection of urethral tissues from freezing and potential scalding risks with hotter water or increased fluid flow rates.
Innovation Solution
A heat exchange catheter design featuring an offset inner balloon configuration that enhances fluid dynamics, maximizing heat exchange efficiency and flexibility, with a minimal thickness discharge tube to maintain consistent temperature along the urethra, using a closed fluid circulation path with countercurrent flow to prevent urethral sloughing during cryosurgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot fluid is pumped through the urethral warming catheter at higher temperatures or increased flow rates to compensate for heat loss, then the urethral tissue near the bladder neck sphincter can be adequately warmed, but the risk of scalding increases and material requirements and fluid flow pressures increase
Solution Approach 1:
The catheter is divided into multiple heating zones with separate fluid pathways, allowing independent temperature control for different segments of the urethra. This enables adequate warming of the bladder neck region without overheating other areas, thus preventing scalding while maintaining therapeutic temperature where needed.
Solution Approach 2:
Different sections of the catheter are designed with different thermal properties and fluid flow characteristics to match the specific thermal requirements of different urethral regions. The bladder neck area receives higher temperature fluid while other areas receive lower temperature fluid, providing locally optimized thermal treatment.
2Temperature
If hot fluid is pumped through the urethral warming catheter at higher temperatures or increased flow rates to compensate for heat loss, then the urethral tissue near the bladder neck sphincter can be adequately warmed, but material requirements and fluid flow pressures increase
Solution Approach 1:
The fluid circulation system is segmented into multiple independent loops, each serving specific zones of the catheter. This allows optimized flow rates for each segment, reducing the overall fluid pressure requirements while maintaining adequate temperature in all regions through distributed heating zones.
Solution Approach 2:
The catheter design ensures continuous heat exchange along its entire length through multiple fluid pathways, eliminating dead zones and maximizing heat transfer efficiency. This continuous action reduces the total fluid volume and pressure needed to achieve the desired warming effect compared to intermittent or single-zone heating.
3Ease of operation
If a minimal thickness discharge tube is used to enhance flexibility, then the catheter can bend around the pubic bone, but heat exchange efficiency may be compromised
Solution Approach 1:
The discharge tube is constructed from composite materials that combine high thermal conductivity with high flexibility. This allows the tube to maintain thin walls for flexibility while the composite structure ensures adequate heat transfer efficiency, resolving the contradiction between mechanical flexibility and thermal performance.
Solution Approach 2:
The catheter design incorporates curved and flexible geometries that naturally conform to the urethral anatomy, reducing the need for thick rigid sections. The offset balloon configuration creates inherent flexibility while maintaining structural integrity for heat exchange.
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
The offset balloon configuration ensures even thermal treatment and increased flexibility of the catheter, effectively maintaining urethral tissue temperature and reducing the risk of urethral sloughing and scalding, while minimizing material requirements and fluid flow pressures.
Implementation Method 1
heat exchange catheter design featuring an offset inner balloon configuration that enhances fluid dynamics, maximizing heat exchange efficiency
Implementation Method 2
using a closed fluid circulation path with countercurrent flow to prevent urethral sloughing during cryosurgical procedures
Implementation Method 3
A heat exchange catheter design featuring an offset inner balloon configuration that enhances fluid dynamics, maximizing heat exchange efficiency
Implementation Method 4
maintaining urethral tissue temperature and reducing the risk of urethral sloughing and scalding
Data Source
AI summary
An inlet flow of heat exchange fluid flows from an inflow housing inlet section, and through an inflow housing main section. It then flows through an inlet fluid passageway formed between an inner balloon and a discharge tube. The flow continues around a distal end of the inner balloon, thus becoming an outlet flow of the heat exchange fluid which is directed through an outlet fluid passageway formed between the inner balloon and an outer balloon, then through an outflow housing main section and finally discharged through an outflow housing outlet section. The inner balloon is in a position offset from the central axis of the catheter. The offset relationship enhances the fluid dynamic properties of the catheter. It provides an increased turbulence, which, in turn, maximizes the heat exchange efficiency.