Abstract: A novel approach to gas servo design is presented which provides closed-center operation while eliminating close clearance sliding seals and elastic members. Pulse-length modulated pressure waves ...

Abstract: A flexible 0. 4-mm-dia pH probe potentially suitable for physiological use has been developed. It is based on the concept of utilizing two single plastic fiber optic strands to illuminate and ...

Abstract: The instrument described enables acute electrical recording from single cells in the human cerebral cortex with minimal tissue trauma. In spite of the great long-term interest that has been ...

Abstract: A miniature catheter suitable for clinical use based on the principle of the continuously everting tube has been developed and tested extensively in dogs. The 1-mm-dia flexible tube can advance ...

Abstract: The advanced development of the clinical everting (toposcopic) catheter is described. A detailed discussion of the design and outline of the fabrication techniques are followed by a thorough ...

Abstract: Highly localized long-term measurements of tumor transport properties are performed with pairs of adjacent, parallel single-strand optic fibers embedded in a laboratory animal. External illumination ...