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May RM, Magin CM, Mann EE, et al. An engineered micropattern to reduce bacterial colonization, platelet adhesion and fibrin sheath formation for improved biocompatibility of central venous catheters. Clin Transl Med. 2015;4:9doi: 10.1186/s40169-015-0050-9.
May, R. M., Magin, C. M., Mann, E. E., Drinker, M. C., Fraser, J. C., Siedlecki, C. A., Brennan, A. B., & Reddy, S. T. (2015). An engineered micropattern to reduce bacterial colonization, platelet adhesion and fibrin sheath formation for improved biocompatibility of central venous catheters. Clinical and translational medicine, 49. https://doi.org/10.1186/s40169-015-0050-9
May, Rhea M, et al. "An engineered micropattern to reduce bacterial colonization, platelet adhesion and fibrin sheath formation for improved biocompatibility of central venous catheters." Clinical and translational medicine vol. 4 (2015): 9. doi: https://doi.org/10.1186/s40169-015-0050-9
May RM, Magin CM, Mann EE, Drinker MC, Fraser JC, Siedlecki CA, Brennan AB, Reddy ST. An engineered micropattern to reduce bacterial colonization, platelet adhesion and fibrin sheath formation for improved biocompatibility of central venous catheters. Clin Transl Med. 2015 Feb 26;4:9. doi: 10.1186/s40169-015-0050-9. eCollection 2015. PMID: 25852825; PMCID: PMC4385044.
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Clin Transl Med. 2015 Feb 26;4:9. doi: 10.1186/s40169-015-0050-9. eCollection 2015.

An engineered micropattern to reduce bacterial colonization, platelet adhesion and fibrin sheath formation for improved biocompatibility of central venous catheters.

Clinical and translational medicine

Rhea M May, Chelsea M Magin, Ethan E Mann, Michael C Drinker, John C Fraser, Christopher A Siedlecki, Anthony B Brennan, Shravanthi T Reddy

Affiliations

  1. Sharklet Technologies, Inc, 12635 E. Montview Blvd. Suite 155, Aurora, CO 80045, CO USA.
  2. Departments of Bioengineering and Surgery, Pennsylvania State University, Hershey, PA USA.
  3. Departments of Materials Science and Engineering and Biomedical Engineering University of Florida, Gainesville, FL 32611 USA.

PMID: 25852825 PMCID: PMC4385044 DOI: 10.1186/s40169-015-0050-9

Abstract

BACKGROUND: Catheter-related bloodstream infections (CRBSIs) and catheter-related thrombosis (CRT) are common complications of central venous catheters (CVC), which are used to monitor patient health and deliver medications. CVCs are subject to protein adsorption and platelet adhesion as well as colonization by the natural skin flora (i.e. Staphylococcus aureus and Staphylococcus epidermidis). Antimicrobial and antithrombotic drugs can prevent infections and thrombosis-related complications, but have associated resistance and safety risks. Surface topographies have shown promise in limiting platelet and bacterial adhesion, so it was hypothesized that an engineered Sharklet micropattern, inspired by shark-skin, may provide a combined approach as it has wide reaching anti-fouling capabilities. To assess the feasibility for this micropattern to improve CVC-related healthcare outcomes, bacterial colonization and platelet interactions were analyzed in vitro on a material common for vascular access devices.

METHODS: To evaluate bacterial inhibition after simulated vascular exposure, micropatterned thermoplastic polyurethane surfaces were preconditioned with blood proteins in vitro then subjected to a bacterial challenge for 1 and 18 h. Platelet adhesion was assessed with fluorescent microscopy after incubation of the surfaces with platelet-rich plasma (PRP) supplemented with calcium. Platelet activation was further assessed by monitoring fibrin formation with fluorescent microscopy after exposure of the surfaces to platelet-rich plasma (PRP) supplemented with calcium in a flow-cell. Results are reported as percent reductions and significance is based on t-tests and ANOVA models of log reductions. All experiments were replicated at least three times.

RESULTS: Blood and serum conditioned micropatterned surfaces reduced 18 h S. aureus and S. epidermidis colonization by 70% (p ≤ 0.05) and 71% (p < 0.01), respectively, when compared to preconditioned unpatterned controls. Additionally, platelet adhesion and fibrin sheath formation were reduced by 86% and 80% (p < 0.05), respectively, on the micropattern, when compared to controls.

CONCLUSIONS: The Sharklet micropattern, in a CVC-relevant thermoplastic polyurethane, significantly reduced bacterial colonization and relevant platelet interactions after simulated vascular exposure. These results suggest that the incorporation of the Sharklet micropattern on the surface of a CVC may inhibit the initial events that lead to CRBSI and CRT.

Keywords: Blood compatibility; CRBSI; CRT; Infection; Microtopography; Platelet activation; Sharklet

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