Journal
IEEE TRANSACTIONS ON MEDICAL IMAGING
Volume 28, Issue 1, Pages 74-81Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMI.2008.927356
Keywords
Optical coherence tomography (OCT)
Categories
Funding
- National Institutes of Health (NIH) Health Bioengineered Allogeneic Tissue (BEAT) partnership [5 R24 HL64387]
- National Science Foundation (NSF) [EEC-9872882, EEC-9529161]
- NSF Graduate Fellowship
- NSF Career Award
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R24HL064387] Funding Source: NIH RePORTER
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The polymeric implant material poly(lactide-co-glycolide) (PLGA) degrades by a process of bulk degradation, which allows it to be used for the controlled release of therapeutic molecules from implants and microspheres. The temporal characterization of PLGA microsphere degradation has been limited by the need to destructively monitor the samples at each time point. In this study, a noninvasive imaging technology, optical coherence tomography (OCT), was utilized to characterize the in situ degradation of PLGA microspheres suspended within photo-crosslinked hyaluronic acid (HA) hydrogels. Microspheres with differing degradation rates were loaded with bovine serum albumin (BSA) as a marker protein, and temporal release of protein was correlated with morphological changes observed during 3-D OCT imaging. As proof-of-principle, a microsphere-loaded hydrogel scaffold was implanted in a modified rat calvarial critical size defect model and imaged using OCT. This animal model presents the opportunity to monitor microsphere degradation over time in living animals.
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