Experimental study of a multiplaned mechanical aortic valve using bovine aorta

Area of Science:

• Biomedical Engineering
• Cardiovascular Surgery
• Medical Device Design

Background:

• The development of mechanical aortic valves aims to improve patient outcomes by minimizing pressure gradients.
• Existing valve designs can lead to significant pressure gradients, impacting hemodynamic efficiency.
• A greater orifice area in mechanical valves is desirable to reduce pressure gradients.

Purpose of the Study:

• To design and test a novel multiplaned mechanical aortic valve with an increased orifice area.
• To evaluate the pressure gradient across the newly designed valve using a bovine aorta model.
• To determine the valve's efficacy in elastic aortic tissue.

Main Methods:

• A multiplaned mechanical aortic valve with angled stents was designed to enhance orifice area.
• The valve was tested on a Dacron tube incorporating a bovine aorta segment.
• Pressure gradients were measured before and after thinning the bovine aorta at a constant flow rate (17 L/min).

Main Results:

• A mean pressure gradient of 65 mmHg was observed before thinning the bovine aorta.
• A zero pressure gradient was achieved after thinning the bovine aorta.
• The multiplaned mechanical aortic valve produced no gradient when tested with elastic aortic tissue.

Conclusions:

• The multiplaned mechanical aortic valve effectively eliminates pressure gradients in elastic aortic tissue.
• This design innovation has the potential to resolve the pressure gradient problem in aortic valve surgery.
• The elasticity of the aorta is a critical factor in the performance of this novel mechanical valve.