Document Detail

Intramural delivery of agent via a novel drug-delivery sleeve. Histological and functional evaluation.
MedLine Citation:
PMID:  7554215     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The infusion sleeve is a novel drug-delivery catheter system designed to deliver an agent under controlled conditions into the arterial wall at the site of angioplasty. The purpose of the present study was to characterize the delivery agent via the infusion sleeve in ex vivo and in vivo models. METHODS AND RESULTS: The delivery of horseradish peroxidase via the infusion sleeve was studied in a porcine explanted heart model. Under physiological conditions, arteries underwent balloon injury (approximately 10% overstretch), after which horseradish peroxidase (2.5 mL) was delivered at specific pressures. Cross-sectional analysis demonstrated greater staining when the agent was delivered at increasing pressures. The infusion sleeve was evaluated in an in vivo canine coronary model. With an infusion sleeve loaded over a standard dilatation catheter through a 9F guide, overstretch balloon injury was performed, after which fluoresceinated heparin was delivered. Animals were killed 2 hours after delivery. Fluoresceinated heparin-treated segments demonstrated high fluorescence signals, localizing with smooth muscle cell nuclei with less activity in the interstitium. The functional significance of intramural heparin delivery was studied in a porcine carotid model. In the presence of 111In-labeled platelets, arteries underwent overstretch injury followed by delivery of heparin (50 or 100 units/kg) or vehicle. Platelet deposition was reduced at 30 minutes (57%, P < .01) and 12 hours (39%, P = .06) compared with saline controls. CONCLUSIONS: Agent delivery via the infusion sleeve is pressure dependent; transmural delivery is possible with minimal disruption of arterial wall architecture; the infusion sleeve is compatible with standard angioplasty equipment; and heparin delivery at the site of balloon injury significantly reduces platelet deposition in a porcine model for a minimum of 12 hours.
A Moura; J Y Lam; D Hébert; J R Kermode; G W Grant; D Robitaille; E J Klein; P G Yock; J B Simpson; A V Kaplan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Circulation     Volume:  92     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1995-11-14     Completed Date:  1995-11-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2299-305     Citation Subset:  AIM; IM    
Montreal Heart Institute, Canada.
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MeSH Terms
Angioplasty, Balloon
Angioplasty, Transluminal, Percutaneous Coronary* / instrumentation
Anticoagulants / administration & dosage*
Carotid Stenosis / etiology,  prevention & control
Coronary Disease / prevention & control,  therapy*
Drug Delivery Systems / instrumentation*
Equipment Design
Heparin / administration & dosage*
Horseradish Peroxidase / administration & dosage
Infusion Pumps
Reg. No./Substance:
0/Anticoagulants; 9005-49-6/Heparin; EC 1.11.1.-/Horseradish Peroxidase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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