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In Vitro Measurement of Contact Pressure Applied to a Model Vessel Wall during Balloon Dilation by Using a Film-Type
Takeshi Moriwaki1, Yoshihiro Okamoto2, Hiroo Yamaga3
1Faculty of Science and Technology, Hirosaki University, Hirosaki, Aomori, Japan.
Journal of Neuroendovascular Therapy
|July 28, 2023
Summary
Contact pressure on blood vessels during balloon dilation is significantly lower than balloon pressure. Stiffer vessels experience higher contact pressures, indicating a risk of rupture even with identical balloon and vessel diameters.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
Background:
- Vascular damage evaluation is crucial in medical interventions.
- Balloon dilation is a common procedure for treating vascular conditions.
Purpose of the Study:
- To quantify the contact pressure on blood vessels during balloon dilation.
- To understand the relationship between contact pressure and balloon pressure.
- To assess how vessel stiffness influences contact pressure.
Main Methods:
- Utilized an in vitro measurement system with a model tube mimicking blood vessel elasticity.
- Employed a film-type pressure sensor placed between the balloon catheter and the model vessel.
- Performed balloon dilation within the model vessel to record pressure data.
Main Results:
- Contact pressure was less than 10% of balloon pressure.
- Contact pressure increase was under 1% of balloon pressure increase (8-14 atm).
- Higher elastic modulus models showed increased contact pressure and its rise.
Conclusions:
- Balloon pressure primarily expands the balloon, with minimal direct contact pressure on soft vessels.
- Contact pressure increases with vessel stiffness, even at identical nominal diameters.
- Clinical implication: Stiff vessels may rupture during high-pressure inflation due to increased contact pressure.
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