Iliac Branch Device With Internal Tubular Side Branch
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Solution Overview
Problem
Standard iliac branch devices are often unsuitable for patients with shorter common iliac arteries due to anatomical limitations, as they require a minimum length for proper seating and function, which is not consistently met in all patient populations, particularly in Asia where the average length may be as short as 20 mm.
Innovation Solution
A stent graft assembly with an internal branch extending proximally within the main body and a scalloped bridging limb that reduces the overall length of the iliac branch device, allowing for secure sealing and flow without extending externally, accommodating patients with shorter common iliac arteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard length iliac branch device is used, then proper seating and flow are achieved in patients with average length common iliac arteries, but the device cannot be deployed in patients with shorter common iliac arteries
Solution Approach 1:
The internal tubular branch is nested within the main body lumen of the iliac branch device, extending proximally from the fenestration into the lumen. This nested configuration allows the device to achieve proper sealing and flow function without requiring the same external length as traditional devices, enabling deployment in patients with shorter common iliac arteries
Solution Approach 2:
The invention moves the branch connection from an external configuration to an internal dimension by creating a fenestration in the main body and extending a tubular branch internally. This dimensional reconfiguration reduces the overall device length while maintaining functional equivalence, allowing adaptation to varied patient anatomies including those with shorter common iliac arteries
2Length of moving object
If the iliac branch device is shortened to accommodate shorter common iliac arteries, then deployment feasibility improves, but sealing engagement with the proximal end may be compromised
Solution Approach 1:
The scalloped fenestration is pre-formed in the main body at the appropriate position before device deployment. This preliminary configuration ensures that when the device is deployed, the scalloped fenestration automatically aligns with and seals against the proximal end of the iliac branch device, maintaining reliable sealing engagement even in shortened device configurations
Solution Approach 2:
The main body incorporates a scalloped fenestration with a specific local geometry designed to mate with the proximal end of the iliac branch device. This localized structural feature provides enhanced sealing capability at the critical connection point, ensuring reliable engagement without requiring increased overall device length
Data Source
Figure 1a~3
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AI summary
A stent graft assembly includes a first prosthesis (2), such as an iliac branch device (IBD), comprising a tubular main body (4), a first leg (14) extending from a distal end of the main body and at least one fenestration (18) formed in the main body. An internal tubular side branch (20) extends proximally from the fenestration into the lumen of the main body, resulting in an iliac branch device having an overall reduced proximal length. The assembly further includes a second prosthesis, or a bridging limb (44), having a distal end with a scalloped fenestration (54) formed therein to accommodate sealing with the proximal end of the iliac branch device without interfering with the internal branch. A connecting stent graft adapted for placement in the internal iliac artery may be sealingly connected to the internal branch.