Technique for aortic valve annuloplasty using an intra-annular "hemispherical" frame

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Medical Devices

Background:

• A stable annuloplasty method is crucial for effective aortic valve repair.
• Existing techniques may not fully address the complex geometry of the aortic valve annulus.
• A hemispherical model provides a new geometric basis for device design.

Purpose of the Study:

• To develop and evaluate a novel hemispherical annuloplasty frame for aortic valve repair.
• To establish a clinically applicable transaortic implant technique for the device.
• To assess the system's efficacy in isolated and intact animal models.

Main Methods:

• Eight isolated porcine aortic roots underwent simulated severe aortic insufficiency via leaflet incision.
• A custom-designed hemispherical annuloplasty frame was implanted using a transaortic approach.
• Valve leak was quantified before and after repair; a survival implant was performed in a calf.

Main Results:

• Surgical induction of insufficiency created a significant valve leak (1400 mL/min).
• Annuloplasty frame implantation restored valve competence, reducing leak to 102 mL/min (P=.004).
• The device demonstrated successful healing and normal valve function in a 6-week calf implant study.

Conclusions:

• Transaortic implantation of the hemispherical annuloplasty frame effectively restored competence in disrupted aortic valves.
• The device reestablished proper leaflet coaptation geometry, proving its stability and efficacy.
• Further development and testing are warranted for this promising aortic valve repair method.