Arkansas Patent of the Month – March 2023
Despite progress in the diagnosis and treatment of cardiovascular diseases, heart attack and stroke remain among the leading causes of death. A key risk factor for cardiovascular diseases is the presence of circulating clots which move through the bloodstream and may unexpectedly block blood vessels. If blocked, oxygen cannot move through and vital organs may become deprived.
This risk factor can be hard to detect. Invasive procedures may analyze blood samples, but this is often time consuming and expensive and may be inaccurate during early phases as the small sample size may be too insignificant. BioVentures, LLC, a biotechnology company formed as a formal outgrowth of the University of Arkansas for Medical Sciences‘ (UAMS), is working towards developing in vivo solutions which could analyze a higher volume of blood and improve early detection.
The company has recently patented a system for detecting clots in vivo – which means within the body. Rather than relying on an invasive procedure or the collection of small blood samples, the solution uses a negative photoacoustic contrast technique that exploits the significantly lower absorption of laser pulse energy by platelets compared to red blood cells at selected ranges of pulse wavelengths.
The science behind the technology came about when it was discovered that circulating clots produced photoacoustic signals that were significantly lower in magnitude than the background photoacoustic signals produced by the surrounding bloodstream. As a result, a sharp reduction in the magnitude of photoacoustic signals within a series of photoacoustic signals may be associated with the detection of a clot in this technique.
The device includes an in vivo flow cytometer, a clot monitoring system, and an alarm system. The in vivo flow cytometer includes a pulsed laser, an optical fiber, and a photoacoustic detector. The clot monitoring system includes a processor that analyzes the photoacoustic pattern emitted by the clot induced by at least one pulse of laser energy to calculate at least one characteristic of the photoacoustic pattern. The processor then compares at least one characteristic of the photoacoustic pattern to a set of calibration patterns to determine clot properties. The alarm system alerts medical personnel when the device detects a clot in the circulatory vessel of the living organism.
The new device and method are non-invasive, continuous, and have high detection sensitivity and spatial resolution, making them suitable for monitoring the development of clots over time and the early detection of circulating microclots. This information may help medical professionals make better-informed decisions regarding therapeutic clot elimination treatments, as well as monitor the effectiveness of such treatments.
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