Cambridge Respiratory Innovations Ltd

Gas Sensing Solutions Ltd.

Wideblue Ltd

Julian Charles Carter

Nalinkumar Lallubhai Patel

Jeremy Walsh

Craig Whitehill

Russell Overend

Colin Phimister

John Lawrence Altrip

Russell Barr Overend

Benjamin Jeremy Walsh

Ewan Waddell

Calum Mcgregor

Ewan Wadell

Des Gibson

We describe a capnometer for analysing respiratory system function of a patient, the capnometer comprising: a memory to store patient data which is specific to said patient; and a signal processor to analyse a COwaveform representing a variation over time in a COlevel of air inhaled and/or exhaled by said patient.

Capnometer

We describe a capnometer for detecting a concentration of a component in a gas, wherein said gas is inhaled and/or exhaled by a patient, said capnometer comprising: an air flow region through which said gas passes to and/or from said patient's lung; a mid-IR semiconductor emitter configured to provide IR light at a wavelength in the range 3-5 μm; a mid-IR semiconductor detector to detect said IR light; a reflector to reflect said IR light emitted by said emitter; wherein said emitter, said detector and said reflector are arranged such that said IR light emitted by said emitter passes through said air flow region via said reflector to said detector. The reflector is selected from a Fresnel reflector and a reflective diffractive optical element, such as a Fresnel zone plate.

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Cambridge, United Kingdom

Julian Charles Carter