An accurate, long-term, pH-sensitive radio pill for ingestion and implantation

Biotelem Patient Monit. 1981;8(4):213-27.


The design of a new radiotelemetry capsule (26 mm long X 7.6 mm diameter), with an in vivo life of 1 month is described in the context of previous work in this field. In vitro evaluation of the capsule indicates an accuracy and performance comparable with a conventional pH meter. Several clinical applications are described, including measurements of gastrointestinal pH in humans and the measurement of extracellular pH in laboratory animals.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antacids / therapeutic use
  • Child
  • Duodenum
  • Extracellular Space
  • Gastric Acid / metabolism
  • Humans
  • Hydrogen-Ion Concentration*
  • Neoplasms, Experimental / physiopathology
  • Pancreatic Diseases / physiopathology
  • Rats
  • Telemetry*


  • Antacids