A patient dedicated arterial blood gas analyser which supports rapid and frequent measurements at critical times.


The NIHR Trauma Management MedTech Co-operative (NIHR Trauma MIC) collaborated with Sphere Medical Ltd on the development of the world’s first patient attached blood gas, electrolyte and metabolite monitoring system.


Regular measurement of physiological variables has become a routine part of the monitoring of patients. The continuous monitoring of critically ill patients, in particular, can be both demanding and time consuming to health practitioners.


The Proxima system allows for near real time analysis, with laboratory accuracy, at the patient’s bedside. It can be utilised on all patients with indwelling arterial cannulae and selected central venous catheters, along with widespread applications in Emergency Departments, transport, major surgery and adult/paediatric critical care.

This device enables faster clinical decision making and the potential for improved patient outcomes whilst cutting costs for healthcare payers.


  • Facilitated the provision of a simulated critical care bed and operating theatre with equipment for ISO 62366 testing
  • Recruited 45 clinical staff volunteers (Consultant Anaesthetists, Operating Department Practitioners, and ICU Nurses) for a usability study
  • Loaned AV equipment for scenario recording
  • Facilitated office space for innovative industry working
  • Assisted through the stages of clinical trials which took place within the ICU at Birmingham’s Queen Elizabeth Hospital
  • Facilitated the testing of the new model of the device to produce pilot data for its use in humans


The device is now fully ISO62366 tested and CE marked, allowing Sphere Medical Ltd to sell to national and international healthcare providers.

The Trauma MIC is creating a business case for the device to be taken up in the NHS.


Mail: +44 (0) 1223 875222