Non-Invasive Microbubble-Ultrasound Imaging Reveals Capillary Stiffness for Early Microvascular Disease Detection
This invention is a non-invasive method that uses ultrasound-driven microbubbles and ultra-high speed microscopic imaging to measure the elasticity of capillary blood vessels. By capturing microbubble oscillation and the resulting capillary wall deformation, the method calculates a elasticity value that can distinguish diseased (stiffer) capillaries from healthy ones without invasive cannulation or radioactive tracers.
Description
Unmet Need - Current microvascular disease assessment relies on invasive cardiac catheterization, radioactive isotopes, or arteriole-only cannulation techniques that cannot access capillaries, leaving capillary-level disease undetected; this technology enables direct, non-invasive quantification of capillary elasticity to close that gap.The method works by introducing a plurality of microbubbles into a biological tissue containing at least one capillary blood vessel, then exposing the microbubbles and vessel to an ultrasound pulse delivered by a transducer. As the microbubbles oscillate and expand under ultrasound exposure, they press against and deform the surrounding capillary wall a compliant (healthy) capillary deforms readily, while a stiff (diseased) capillary resists deformation. An ultra-high speed microscopic camera captures a time-stamped series of images of this interaction, which are processed to determine a capillary wall deformation stress and/or strain value. From these values, an elasticity measurement (expressed as Young's modulus) is calculated, providing a quantitative, non-invasive readout of capillary stiffness.
A related embodiment extends this approach comparatively: by contacting microbubbles with two separate biological tissue samples (e.g., a diseased tissue and a healthy tissue) and oscillating both under the same ultrasound pulse, the method determines whether the capillary elasticity value of one tissue is higher than the other, enabling direct diseased-versus-healthy comparisons.
Applications
- Non-invasive diagnostic tool for evaluating capillary-level microvascular disease in biopsy-derived tissue samples- Ex vivo research platform for comparing capillary elasticity between diseased and healthy tissue specimens
- In vivo microvascular assessment across multiple tissue types, including muscle, heart, lung, brain, kidney, and pancreas
- Treatment efficacy monitoring tool for tracking changes in capillary stiffness over the course of therapy
- Research and preclinical tool for studying microvascular disease progression in animal or biopsy models
Advantages
- Enables elasticity measurement of capillaries (5–15 µm), vessels too small for conventional cannulation-based methods- Avoids invasive cannulation and radioactive isotope delivery required by current approaches
- Works with microbubbles sized equivalent to or smaller than the target capillary, allowing direct intravascular contact
- Captures time-stamped image series for precise, reproducible stress and strain determination
- Applicable to both ex vivo and in vivo tissue, and across multiple organ types, broadening its diagnostic and research utility