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A patient-isolated calibration system is described for use with catheter transducer physiological pressure measuring apparatus. A subatmospheric calibration pressure is applied to the rear of the transducer diaphragm, the latter isolating the patient hydraulic circuit from the calibration system. The calibration system need not therefore be sterile and remains assembled to the transducer table. Risk of air embolus in the patient and of over-pressurising the transducer during calibration are minimised. Simplification of the hydraulic circuit reduces the chance of air entrapment, improving frequency response and reproducability of results and preparation time is greatly reduced. The system is easy to make and has proved simple, rugged and reliable in use.
R H Murray, and
N A Howe
August 1998,
Physiological measurement,
R H Murray, and
N A Howe
February 1999,
The Journal of bone and joint surgery. American volume,
R H Murray, and
N A Howe
January 1975,
Biomedical engineering,
R H Murray, and
N A Howe
September 1988,
Health devices,
R H Murray, and
N A Howe
January 1970,
Journal of dental research,
R H Murray, and
N A Howe
April 1992,
Kyobu geka. The Japanese journal of thoracic surgery,
R H Murray, and
N A Howe
May 1974,
Medical & biological engineering,
R H Murray, and
N A Howe
February 1972,
Iyo denshi to seitai kogaku. Japanese journal of medical electronics and biological engineering,
R H Murray, and
N A Howe
September 1991,
British journal of anaesthesia,
R H Murray, and
N A Howe
January 1973,
Medical & biological engineering,
