Evert Cuff Aorta Treatment Device Anastomosis
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Solution Overview
Problem
Existing aorta treatment devices face difficulties in aligning and suturing the proximal end of the distal aorta with a flange-shaped collar due to varying end surface shapes and sizes among patients, and struggle to achieve sufficient close contact of the stent graft with the inner wall of the distal aorta, often resulting in tension and incomplete contact.
Innovation Solution
An aorta treatment device featuring a branched artificial blood vessel with a cuff portion that can be everted to facilitate coaxial suturing with the distal aorta, along with a stent graft portion that can be expanded to fit snugly within the aorta, ensuring proper contact and alignment without residual tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flange-shaped collar is used for anastomosis, then the device structure is simplified, but alignment difficulty increases due to varying distal aorta end surface shapes among patients
Solution Approach 1:
The cuff portion is everted (turned inside out) to create an inverted configuration that facilitates alignment with the distal aorta. This inversion allows the cuff to conform to the varying end surface shapes of different patients, resolving the alignment difficulty while maintaining a relatively simple device structure.
Solution Approach 2:
The cuff portion is designed to be flexible and adjustable in size, allowing it to adapt dynamically to different patient anatomies. The cuff can be cut to appropriate sizes and everted to match the specific end surface shape of each patient's distal aorta, improving ease of operation without significantly increasing device complexity.
2Manufacturing precision
If the stent graft is expanded to fit the distal aorta, then close contact with the inner wall is achieved, but tension remains after suturing
Solution Approach 1:
The cuff portion is everted to create an inverted configuration that reduces residual tension after suturing. This inversion allows the cuff to accommodate the expanded stent graft while maintaining close contact with the distal aorta inner wall, achieving both good contact and reduced tension simultaneously.
3Ease of operation
If the cuff size is adjusted by cutting, then alignment with distal aorta is improved, but surgical time increases
Solution Approach 1:
The cuff portion is designed to be flexible and adaptable in size, allowing surgeons to cut it to appropriate lengths for different patients. This dynamic adjustability improves alignment accuracy with the distal aorta while minimizing additional surgical time through straightforward cutting and eversion procedures.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
An aorta treatment device includes a branched artificial blood vessel portion (10) including side tubes (11) to (14) that branch off from a main tube (15), a stent graft portion (20) coupled to a distal side of the branched artificial blood vessel portion (10) by being sutured; and a cuff portion (30) that is formed so as to extend from a distal end (16) of the branched artificial blood vessel portion (10) toward the distal side, that is evertable so as to enter a state in which the cuff portion (30) extends from the distal end (16) of the branched artificial blood vessel portion (10) toward a proximal side, and that has a skirt-like shape. With the aorta treatment device, it is possible to replace an aortic arch with the branched artificial blood vessel portion, place the stent graft portion in a distal aorta, and anastomose the branched artificial blood vessel portion and the distal aorta easily compared with an existing device.