Ultrasensitive photonic microsystem enabling sub-micrometric monitoring of arterial oscillations for advanced cardiovascular studies

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DOI

  • Rosalía Rodríguez-Rodríguez, Universitat Internacional de Catalunya
  • ,
  • Tobias Nils Ackermann, Institut de Microelectrònica de Barcelona (IMB-CNM CSIC)
  • ,
  • Jose Antonio Plaza, Institut de Microelectrònica de Barcelona (IMB-CNM CSIC)
  • ,
  • Ulf Simonsen
  • Vladimir Matchkov
  • Andreu Llobera, Institut de Microelectrònica de Barcelona (IMB-CNM CSIC)
  • ,
  • Xavier Munoz-Berbel, Institut de Microelectrònica de Barcelona (IMB-CNM CSIC)

Cardiovascular diseases are the first cause of death globally. Their early diagnosis requires ultrasensitive tools enabling the detection of minor structural and functional alterations in small arteries. Such analyses have been traditionally performed with video imaging-based myographs, which helped to investigate the pathophysiology of the microvessels. Since new vascular questions have emerged, substantial modifications are necessary to improve the performance of imaging and tracking software, reducing the cost and minimizing the microvessel cleaning and manipulation. To address these limitations, we present a photonic microsystem fabricated in polydimethylsiloxane and integrating micro-optical elements and a lightguide-cantilever for sub-micrometric analysis of small arteries (between 125 and 400 mu m of basal diameter). This technology enables simultaneous measurement of arterial distension, stiffness, vasomotion, and heartbeat and without the need for advanced imaging system. The microsystem has a limit of detection of 2 mu m, five times lower than video imaging-based myographs, is two times more sensitive than them (0.5 mu m/mmHg), reduces variability to half and doubles the linear range reported in these myographs. More importantly, it allows the analysis of intact arteries preserving the integrity and function of surrounding tissues. Assays can be conducted in three configurations according to the surrounding tissue: (i) isolated arteries (in vitro) where the surrounding tissue is partially removed, (ii) non-isolated arteries (in vivo) with surrounding tissue partially removed, and (iii) intact arteries in vivo preserving surrounding tissue as well as function and integrity. This technology represents a step forward in the prediction of cardiovascular risk.

OriginalsprogEngelsk
Artikelnummer940
TidsskriftFrontiers in Physiology
Vol/bind10
Antal sider11
ISSN1664-042X
DOI
StatusUdgivet - jul. 2019

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