Orthotopic Artificial Bladder Endoprosthesis with Concave Base
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Solution Overview
Problem
Existing bladder endoprostheses have a non-natural shape, leading to issues with urine flow and potential kidney damage or infection due to urine reflux during urination.
Innovation Solution
An orthotopic artificial bladder endoprosthesis with a concave base and cap design, featuring a multi-layered silicone membrane and a PGA fiber fabric cap, which provides natural conformation and prevents urine reflux by ensuring proper urine flow and integration with the patient's tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-natural shape is used in bladder endoprosthesis, then the device can be manufactured with simpler geometry, but urine flow is disrupted and kidney damage or infection occurs due to reflux
Solution Approach 1:
The bladder endoprosthesis is designed with a natural bladder-like shape featuring curved surfaces and a dome configuration. The base includes a curved posterior wall and the cap forms a domed anterior portion, replicating the natural anatomy of a human bladder. This curvature optimization ensures physiological urine flow patterns and prevents reflux into the ureters, thereby eliminating kidney damage while maintaining manufacturability through conventional forming processes.
2Stability of the object's composition
If a multi-layered silicone membrane is used, then the base has sufficient rigidity to maintain shape, but the device complexity increases
Solution Approach 1:
The base of the bladder endoprosthesis is constructed from a multi-layered silicone membrane comprising alternating layers of silicone rubber and reinforcing fibers. This composite structure provides the necessary rigidity to maintain the natural bladder shape while allowing controlled flexibility for manual compression during emptying. The layered construction with embedded fibers offers structural stability without excessive complexity, as the layers are bonded together in a systematic manner.
3Adaptability or versatility
If the cap is made with PGA fiber fabric, then tissue integration and biocompatibility are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The cap is constructed from a porous PGA (polyglycolic acid) fiber fabric that allows tissue ingrowth and integration. The porous structure with controlled pore size and distribution promotes cell infiltration and vascularization, enabling the cap to integrate with surrounding bladder tissue. This biocompatible material choice enhances adaptability and tissue acceptance while the fabric can be manufactured using standard textile and non-woven fabric production techniques.
Data Source
Figure 1~2
Figure 3~4
AI summary
An orthotopic artificial bladder endoprosthesis comprises a base (2) obtained with a multi-layered silicone membrane having an external surface and an internal surface both coated with pyrolytic turbostratic carbon; a resorbable cap (3) obtained with a PGA fiber fabric, said base (2) and said cap (3) being connected with each other along respective edges (2c, 3c), in order to define a closed enclosure (4); said base (2) is connectable to the urethra and to the ureters of a patient; said base (2) also being of substantially triangular form.