Redsense is a blood loss detection device comprising two parts: a sensor patch and an alarm unit. Connected to the alarm unit by a small wire, the sensor patch employs fibre optic technology to continuously monitor the venous needle access point.

An infrared signal is transmitted from the alarm unit to the sensor patch using fibreoptic cable (1). In the event of bleeding, innerlayers of the patch smear blood over the optical sensor trigger the alarm (2). Outer layers of the patch are absorbent (3).

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Redsense has developed a functioning alarm for monitoring the venous needle during hemodialysis mainly for the clinical environment. It has obtained acceptance from clinics in Sweden. The product has been presented in Seattle, Wa, a wellknown centre for dialysis research and development. It has also been presented in Toronto, Canada, which is a leading centre for the development of Nocturnal Home Hemodialysis.

Redsense is built on a technology, which is based on integrated optical fibres and is composed of two parts - an alarm unit and a sensor unit, which are interconnected.(ref 4) The alarm unit constitutes the base technology, while the sensor unit, which comprises optical fibres, which carry infrared light, is a single use item.

The Redsense sensor patch comprises three parts; a plaster which you attach over the venous needle on the patient, an optical fibre which carries the light and a transparent connector which is connected to the alarm unit.