A transcutaneous blood gas sensor comprises a sensor body having a central projection (9), a ring-shaped collar (6) to be attached to the skin and a membrane holder (4) having a membrane stretcher hole (10) to be fitted with the central projection of the sensor body for holding and retaining a membrane (3) between the periphery of the membrane stretcher hole and the ring-shaped collar. The central projection of the sensor body has a spherical end surface (13), whose radius is at least twice and not more than six times the inner diameter of the membrane stretcher hole.
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