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Updated: Aug 12, 2026

Technique and Patient Selection Criteria of Right Anterior Mini-Thoracotomy for Minimal Access Aortic Valve Replacement
Published on: March 26, 2018
Minimally invasive cardiac surgery by the port-access method
Ryohei Yozu1, Hankei Shin, Tadaaki Maehara
1Department of Cardiovascular Surgery, School of Medicine, Keio University, Tokyo, Japan. yozu2351@remus.dti.ne.jp
Minimally invasive cardiac surgery, or port-access cardiac surgery, offers benefits like shorter hospital stays. New technologies, including a novel endoaortic balloon clamp and a modified aortic clamp, facilitate safer and more effective procedures.
Area of Science:
- Cardiovascular Surgery
- Minimally Invasive Techniques
- Medical Device Technology
Background:
- Minimally invasive surgery is gaining importance in cardiac surgery.
- Key goals include reduced hospital stay, faster recovery, and improved cosmetic outcomes.
- Technological advancements are crucial for the success of these procedures.
Purpose of the Study:
- To describe the experience and assess the quality of port-access cardiac surgery.
- To introduce novel devices supporting minimally invasive cardiac procedures.
- To evaluate the safety and efficacy of new surgical tools.
Main Methods:
- Development and application of a direct endoaortic clamp balloon (Yozu balloon) for cardioplegia delivery and venting.
- Modification of the Cosgrove flex clamp for transthoracic application through small incisions.
- Utilizing an 8 mm port for secure aortic clamping during minimally invasive procedures.
Main Results:
- The Yozu balloon allows direct insertion into the ascending aorta for cardioplegic solution delivery and venting.
- The modified Cosgrove flex clamp enables safe and secure aortic clamping via a small port.
- These innovations support the feasibility of port-access cardiac surgery.
Conclusions:
- Port-access cardiac surgery is a developing and promising approach in cardiac operations.
- The introduced technologies enhance the safety and effectiveness of minimally invasive cardiac procedures.
- Future technological progress is expected to drive the wider adoption of this surgical method.
Related Concept Videos
Cardiac Catheterization I: Pre-Procedure Overview
Cardiac Catheterization II: Right Heart Catheterization
Cardiac Catheterization III: Left Heart Catheterization

