Scalloped Sewing Cuff for Heart Valve
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Solution Overview
Problem
Conventional prosthetic heart valve implantation techniques flatten the aortic root's annulus region due to two-dimensional suturing, disrupting hemodynamic blood flow and limiting surgical flexibility.
Innovation Solution
A prosthetic heart valve design featuring a scalloped sewing cuff assembly with semilunar arches that tracks the crown-like anatomical annulus, allowing for three-dimensional suturing and reducing distortion of the native anatomy, thereby improving blood flow and implantation ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional two-dimensional suturing is used to attach the prosthetic valve, then the valve can be securely anchored to the annulus, but the annulus region becomes flattened and distorted
Solution Approach 1:
The sewing cuff is extended in the vertical dimension to create a three-dimensional attachment structure with height of at least 0.5 inches. This allows sutures to be placed throughout the vertical height of the cuff, distributing attachment forces in multiple dimensions rather than flattening the annulus into a two-dimensional plane, thereby maintaining the native crown-shaped configuration while achieving secure anchoring
2Manufacturing precision
If the sewing ring is made narrow for precise positioning, then the valve can be accurately seated, but the surgeon's flexibility in suture placement is limited
Solution Approach 1:
The sewing cuff is designed with significant vertical height (at least 0.5 inches, representing at least 30% of valve height) rather than a fixed narrow ring, allowing the attachment zone to be dynamic and adaptable. The surgeon can place sutures at varying vertical positions along the cuff height, adjusting suture placement based on anatomical variations and surgical needs while maintaining precise valve positioning
3Ease of manufacture
If the valve is implanted using conventional methods, then the implantation process is straightforward, but blood flow hemodynamics are disrupted due to annulus flattening
Solution Approach 1:
By extending the sewing cuff vertically into three dimensions, the design preserves the natural crown-shaped configuration of the annulus and its attachment to the aortic root. This maintains the physiological relationship between the annulus and coronary ostia, preventing hemodynamic disruptions while keeping the implantation process straightforward through the extended attachment surface
4Shape
If the sewing cuff is made tall to allow three-dimensional suturing, then the native anatomy is preserved, but the device complexity increases
Solution Approach 1:
The sewing cuff is constructed as a flexible, thin-walled structure with vertical height, allowing it to conform to the three-dimensional crown-shaped annulus while maintaining structural integrity. The flexible material enables the cuff to adapt to anatomical variations without requiring complex rigid support structures, preserving native anatomy while avoiding excessive device complexity
Data Source
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AI summary
An embodiment of the invention includes a sewing cuff for aortic heart valves that better approximates native anatomy by better mating with the crown-like anatomical annulus. Limiting distortion of the crown-like annulus provides better blood flow and overall valve function and provides a physician greater ease of implantation since native anatomy is not flattened. Thus, the surgeon may attach sutures to the fibrous tissue of the crown-like anatomical annulus without distorting the shape of the native anatomy. An embodiment includes a scalloped sewing cuff assembly (with semilunar arches) that tracks the crown-like annulus. Another embodiment provides a sewing cuff positioned over the majority of the valve's length, thus allowing the surgeon greater flexibility as to where he or she can attach sutures to the surgical annulus. Conventional valves, which are primarily "low-profile" devices, do not offer such ability. Other embodiments are described herein.