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Shape retaining injectable hydrogels for minimally invasive bulking
Amanda J Thornton1, Eben Alsberg, Elliot E Hill
1Department of Biologic and Material Sciences, University of Michigan, Ann Arbor, 48109, USA.
The Journal of Urology
|July 13, 2004
Summary
New porous hydrogels maintain shape and volume, offering a promising alternative to current urethral bulking agents. These advanced scaffolds facilitate cell infiltration and minimize calcification, improving implant success.
Area of Science:
- Biomaterials science
- Regenerative medicine
- Urology
Background:
- Current urethral bulking agents face limitations like particle migration, poor shape retention, and rapid resorption.
- Injectable, shape-defining porous scaffolds offer potential advantages for tissue engineering and bulking applications.
Purpose of the Study:
- To develop and evaluate shape-retaining porous alginate hydrogel scaffolds for minimally invasive delivery as potential urethral bulking agents.
- To assess scaffold performance regarding shape/volume retention, cell infiltration, calcification, and inflammatory response.
Main Methods:
- Alginate hydrogels with varying covalent cross-linking were prepared and dehydrated for minimally invasive delivery.
- Scaffolds were implanted in mice, rehydrated in situ, and evaluated for shape retention, volume, cell infiltration, calcification, and inflammation over 24 weeks.
- Ionically cross-linked calcium alginate served as a control.
Main Results:
- 95% of scaffolds were recovered, with 80% maintaining their 3D shape for 6 months.
- Highly cross-linked scaffolds (20% and 35%) showed superior volume maintenance and tissue infiltration.
- Covalently cross-linked scaffolds avoided calcification, unlike 98% of calcium alginate controls; inflammation was minimal.
Conclusions:
- Shape-retaining porous hydrogels demonstrate significant potential as advanced injectable bulking agents.
- These hydrogels overcome limitations of current agents by offering improved shape fidelity, controlled resorption, and reduced calcification.
- The minimally invasive delivery and in situ rehydration of these scaffolds represent a significant advancement in bulking agent technology.