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Updated: Jul 21, 2026
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Imaging In-Stent Restenosis: An Inexpensive, Reliable, and Rapid Preclinical Model
Published on: September 14, 2009
A polyhydroxybutyrate biodegradable stent: preliminary experience in the rabbit.
M Unverdorben1, A Spielberger, M Schywalsky
1Center for Cardiovascular Diseases, Heinz-Meise-Strasse 100, D-36199 Rotenburg a. d. Fulda, Germany.
Cardiovascular and Interventional Radiology
|March 20, 2002
Summary
Biodegradable polyhydroxybutyrate stents caused severe inflammation and narrowing in rabbit arteries. Tantalum stents, however, improved lumen diameter without restenosis, suggesting their potential clinical utility.
Area of Science:
- Biomaterials Science
- Vascular Surgery
- Medical Device Research
Background:
- Persistent foreign bodies in arteries can lead to restenosis.
- Biodegradable devices are being explored to reduce recurrence rates after interventions.
Purpose of the Study:
- To compare the vascular response and efficacy of polyhydroxybutyrate (PHB) biodegradable stents versus tantalum stents in a rabbit iliac artery model.
- To evaluate the potential of biodegradable stents in preventing restenosis.
Main Methods:
- Eleven polyhydroxybutyrate and 13 tantalum stents were implanted in New Zealand white rabbit iliac arteries for up to 30 weeks.
- Vascular tissue specimens were harvested, processed, and stained for histological analysis.
Main Results:
- Polyhydroxybutyrate stents induced significant inflammation, collagen increase, thrombosis, and lumen narrowing.
- Tantalum stents progressively increased in-stent lumen diameter and mural collagen, without causing restenosis or thrombosis.
- Polyhydroxybutyrate degraded elastic membranes, while tantalum stents penetrated the external elastic membrane.
Conclusions:
- Polyhydroxybutyrate stents elicit intense inflammatory vascular reactions, precluding their clinical application.
- Tantalum stents demonstrated favorable outcomes in this model, with no observed restenosis or thrombosis.
