Sheffield Ventilator Mark 1 & 2
Designed by Dr A Murray Wilson whilst a Registrar at the Sheffield Children's Hospital in 1964. Over a weekend he developed a 'mechanical thumb' for the outflow circuit of the 'T-piece'. The design was taken up commercially by Eardley's, a company better known for manufacture of beer dispensing pumps! This example is a mixture of Mark 1 & 2 components.

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