Heated Cryogenic Balloon Catheter for Outer Wall Temperature Control
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Solution Overview
Problem
Cryogenic balloon catheters with thin walls transfer cold to the outer surface, potentially freezing blood vessels and damaging tissues due to inadequate thermal insulation, posing a risk during medical procedures.
Innovation Solution
A cryogenic balloon catheter with a heating function, featuring a metal woven mesh in the middle layer connected to an external power source, a temperature controller, and a thermocouple for precise temperature control, ensuring the outer surface maintains a stable temperature to prevent tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the catheter wall is made thin to ensure adequate space for inner diameter, then the inner diameter space is improved, but the thermal insulation effect deteriorates causing cold transfer to outer surface
Solution Approach 1:
The catheter wall is constructed as a composite structure with three distinct layers: an inner layer made of biocompatible material, a middle layer containing metal woven mesh for heating, and an outer layer made of polyether-block-amide resin material. This composite structure enables the thin-walled catheter to maintain thermal insulation while providing active temperature control through the heating element.
2Reliability
If cryogenic fluid is introduced into the catheter to achieve cryoablation effect, then the cryoablation effect is improved, but the outer surface temperature drops causing tissue freezing damage
Solution Approach 1:
The metal woven mesh in the middle layer is connected to an external power source to generate heat, converting the harmful cold transfer to the outer surface into a beneficial heating effect. This active heating compensates for the cold transfer from cryogenic fluid, maintaining outer surface temperature above freezing while preserving the cryoablation effect inside the catheter.
Solution Approach 2:
A temperature controller arranged in the power supply circuit monitors and regulates the temperature of the outer surface, providing feedback control to the heating element. This ensures the outer surface temperature is maintained within a safe range, preventing tissue freezing while allowing cryogenic therapy to proceed.
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 heating function maintains the catheter's outer surface temperature within a safe range, preventing tissue freezing while preserving the cryoablation effect, ensuring uniform heat distribution and accurate temperature control.
Implementation Method 1
the middle layer includes a metal woven mesh that is connected in a power supply circuit of the external power source
Implementation Method 2
the temperature controller is electrically connected with a thermocouple embedded in the outer wall of the catheter body
Data Source
AI summary
A cryogenic balloon catheter having a heating function, the cryogenic balloon catheter comprising a catheter, an external power source, wherein an outer wall of the catheter comprises an inner layer, a middle layer and an outer layer, which are sequentially arranged from inside to outside, the middle layer comprising a metal woven mesh, and the metal woven mesh, the temperature controller and the external power source forming a power supply circuit. In the cryogenic balloon catheter, the middle layer of the outer wall of the cryogenic balloon catheter is provided with the metal woven mesh having a heat conduction function, and the metal woven mesh is connected to the external power source, such that the metal woven mesh can generate heat after being powered, so as to ensure that the temperature of the outer surface of the catheter is maintained within set temperatures, thereby ensuring the cryogenic ablation effect.