Method measuring oxygen tension and transport within subcutaneous devices

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Biomedical Engineering

Background:

• Cellular therapies offer alternatives to organ transplantation.
• In vivo cell survival relies on adequate oxygen supply, as hypoxia can be toxic.
• Current methods for assessing oxygenation within implantable devices are insufficient.

Purpose of the Study:

• To develop a novel method for direct in vivo measurement of oxygen partial pressure within implantable devices.
• To validate the utility of oxygen-sensitive microparticles (OSMs) for monitoring oxygenation in encapsulated cells.
• To assess oxygen transport dynamics in implantable devices over time.

Main Methods:

• Incorporation of oxygen-sensitive microparticles (OSMs) into subcutaneously implanted devices.
• Non-invasive in vivo oxygen partial pressure measurement using an optical probe on the skin surface.
• Characterization of oxygen transport through alginate beads containing OSMs in Sprague–Dawley rats.

Main Results:

• OSMs allowed direct, in vivo measurement of oxygen partial pressure within implantable devices.
• Dynamic OSM signals accurately reflected changes in oxygen transport in response to altered inhaled oxygen levels.
• The technology demonstrated utility in monitoring oxygen dynamics over several days.

Conclusions:

• OSMs provide a direct and reliable method for assessing oxygenation within implantable devices.
• This technology can help ensure sufficient oxygen delivery to encapsulated cells, enhancing their survival and function.
• The developed technique holds promise for improving the efficacy and longevity of cellular therapies.