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Published on: December 11, 2017
Cutting precision in a novel aortic valve resection tool. Research in progress
Daniel Wendt1, Sebastian Stühle, Hermann Wendt
1Department of Thoracic and Cardiovascular Surgery, West-German Heart Center Essen, University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany. daniel.wendt@uk-essen.de
Interactive Cardiovascular and Thoracic Surgery
|July 17, 2009
Summary
This study shows a new aortic valve resection tool accurately cuts calcified aortic valves, increasing valve area for prosthesis implantation. Further enhancements are suggested for improved precision and to prevent secondary damage.
Area of Science:
- Cardiovascular Surgery
- Medical Device Technology
- Surgical Innovation
Background:
- Minimal-invasive aortic valve resection tool previously demonstrated in vitro.
- Current study assesses device accuracy with a linear motor-based propulsion unit.
Purpose of the Study:
- Evaluate the cutting accuracy of a novel aortic valve resection tool.
- Assess the device's effectiveness in preparing the aortic annulus for prosthesis implantation.
Main Methods:
- Resection of artificially stenosed and calcified native aortic valves in swine hearts (n=7).
- Utilized a tool with Nitinol cutting blades and linear motors for automated cutting.
- Measured pre- and post-procedure aortic valve area, leaflet residue, and cutting precision (radial deviation, center deviation).
Main Results:
- Successful resection of aortic valves and leaflets in all cases.
- Significant increase in aortic valve area (0.3 cm² to 1.1 cm², P<0.001) with a mean cutting time of 49.7 seconds.
- Median deviation of the cutting ring from the desired position was 1.3 mm (y-axis) and 1.4 mm (x-axis).
Conclusions:
- The aortic valve resection tool effectively cuts stenotic valves, creating a suitable landing zone for prostheses.
- The device demonstrated accelerated cutting and near-complete leaflet resection.
- Enhancements, such as a centering mechanism, are recommended to improve cutting precision and avoid secondary damage.
