Acellular Tubular Conduits With Stent-ECM Composite Support
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Solution Overview
Problem
Current surgical options for replacing damaged or diseased anatomical conduits such as trachea, esophagus, and urinary conduits are inadequate, leading to complications like anastomotic leaks, ischemia, necrosis, chronic metabolic acidosis, and recurrent infections due to the use of ileal conduits.
Innovation Solution
Development of artificial conduits comprising a tubular stent encased in acellular extracellular matrix, produced by vascular smooth muscle cells, which are cultured and decellularized to form a composite tissue that integrates with the stent, providing structural integrity and minimizing slippage or leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ileal conduits are used for urinary diversion, then surgical simplicity is achieved, but complications such as anastomotic leaks, ischemia, necrosis, and chronic metabolic acidosis occur
Solution Approach 1:
The patent employs a biodegradable scaffold that temporarily provides structural support during the critical healing period and then degrades naturally. This disposable approach eliminates the need for permanent foreign materials and reduces long-term complications while maintaining surgical simplicity.
Solution Approach 2:
The invention uses a composite structure combining biodegradable scaffold material with the patient's own tissue. The scaffold provides immediate structural integrity for anastomosis, while the living tissue gradually takes over function, creating a hybrid construct that minimizes complications associated with either pure synthetic or pure biological materials.
2Ease of operation
If bowel is harvested to form urinary conduit, then urinary diversion is achieved, but anastomotic leaks and peritonitis occur at the bowel harvest site
Solution Approach 1:
The biodegradable scaffold serves as a temporary placeholder that provides structural support only during the critical early healing phase. Once the patient's tissue has regenerated and taken over function, the scaffold naturally degrades and is eliminated, removing the source of potential long-term complications.
Solution Approach 2:
The scaffold employs a porous structure that allows for tissue ingrowth and vascularization while maintaining structural integrity. This porosity facilitates integration with host tissue, reducing the risk of anastomotic leaks and peritonitis by creating a seamless transition between the conduit and surrounding tissues.
3Ease of operation
If ileal conduits are used for urinary diversion, then drainage is achieved, but chronic hyperchloremic metabolic acidosis occurs due to electrolyte resorption
Solution Approach 1:
By using a biodegradable scaffold instead of permanent intestinal tissue, the conduit eventually transitions to being lined entirely by the patient's own urothelium. This eliminates the foreign intestinal tissue that actively resorbs electrolytes, thereby preventing chronic hyperchloremic metabolic acidosis while maintaining drainage function.
Solution Approach 2:
The invention extracts and removes the problematic intestinal tissue component from the conduit construction. Instead of using bowel segments that inherently resorb electrolytes, the scaffold serves only as a temporary framework that is eventually completely replaced by non-resorptive patient tissue.
4Ease of operation
If ileal conduits are used for urinary diversion, then drainage function is provided, but recurrent urinary tract infections and pyelonephritis occur due to bacterial harboring
Solution Approach 1:
The temporary nature of the biodegradable scaffold means it is present in the urinary tract only during the initial healing period when infection risk is highest but the conduit is still being integrated. Once degraded, the conduit is lined entirely by the patient's own tissue, eliminating the foreign material that harbors bacteria and causes recurrent infections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The artificial conduits exhibit enhanced structural stability, resistance to physiological stresses, and reduced immune response, minimizing complications and improving long-term functionality by integrating seamlessly with host tissues.
Implementation Method 1
The smooth muscle cells proliferate and secrete extracellular matrix on the mesh scaffold
Implementation Method 2
The smooth muscle cells proliferate and secrete extracellular matrix on the mesh scaffold
Implementation Method 3
The tubular stent is decellularized to form an acellular tubular airway stent encased in extracellular matrix
Data Source
AI summary
Tubular prostheses are provided for use in airways, upper digestive, and urinary tracts. Each of these uses has its own specific sets of biological specifications, based on what it must contain and exclude and the physical and chemical pressures and stresses to which it is subjected. The prostheses may be made from allogeneic cells. Thus they can be manufactured and stored prior to an individual's personal need arising.