The Eversense® continuous glucose monitoring (CGM) system is a device used to monitor blood glucose levels in people living with diabetes.
Developed by Senseonics, the device was approved by the US Food and Drug Administration (FDA) as a prescription device in June 2018. It is one of the first approved long-term CGM systems and is able to monitor blood glucose levels every five minutes for up to 90 days. The device was commercially launched in August 2018.
Eversense continuous glucose monitoring system components and usage
The Eversense® CGM system provides blood glucose level readings from 40mg/dl to 400mg/dl in real-time. The system consists of a subcutaneously implantable sensor, a removable transmitter and a mobile app.
A single implantable sensor coated with a fluorescent polymer is implanted subcutaneously in the upper arm of the patient. It responds to the glucose concentration present in the interstitial fluid of the body and emits a small amount of fluorescent light.
A transmitter is worn over the sensor on the body, which receives the blood glucose level reading from the sensor and calculates the value of blood glucose. The blood glucose value is then transmitted to the mobile app via Bluetooth.
The mobile app sends alerts to the user about the fluctuating glucose values sent by the sensor. It also tracks daily activities such as intake of meals and exercise to provide a graph for identifying trends and patterns.
The implantable sensor is made up of biocompatible materials such as homopolymer polymethylmethacrylate, hydroxyethylmethacrylate-based hydrogel, platinum, silicone, and epoxy 301-2. It measures 18.3mm in length and 3.5mm in diameter and is sterilised by ethylene oxide.
The sensor features a silicone elution ring containing a small amount of an anti-inflammatory drug called dexamethasone acetate. When the sensor comes in contact with the interstitial fluids, the ring releases a small amount of the drug, which helps in reducing the inflammatory response of the body against the implanted sensor.
The transmitter in Eversense® continuous glucose monitoring system is a round-shaped, water-resistant device with a polycarbonate body. It is designed to provide on-body vibratory alerts when the blood glucose levels fluctuate, even when the mobile device is away.
The transmitter also powers the sensor and contains a non-replaceable, rechargeable lithium polymer battery, which can be reused for up to one year.
The transmitter measures 37.6mm-long, 48mm-wide and 8.8mm-thick, and offers a communication distance of up to 24.9ft between the app and the transmitter.
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