Abstract
Merits of a new telemetering system designed to measure pH in the gastrointestinal tract are briefly discussed in conjunction with present technics. In vitro evaluation of the Corning Acido Capsule system includes (a) temperature stability measurements, (b) speed of response to abrupt changes in pH, (c) accuracy of pH indication in the range of pH 1 to pH 8, and (d) long-term stability of the system. The data show that the pH determination is accurate to ± 0.2 pH units for tests lasting up to 18 hours. Preliminary in vivo evaluations indicate that the capsule system provides a convenient and accurate method of measuring hydrogen-ion activity in the alimentary canal, and suggest further in vivo evaluation of the system.
Similar content being viewed by others
References
Aynaciyan AF, Bingham JR: pH of the duodenum of patients with and without duodenal ulcers measured with a radio-telemetering capsule. Gastroenterology 56:476–482, 1969
Fehr H, Stavney LS, Hamilton T, et al: Hiatal hernia investigated by pH telemetering. Amer J Dig Dis 11:747, 1966
Lawrie JH: The measurement of gastric acid. Post Grad Med J 41:408, 1965
McAlhany JC, Yarbrough DR, Weidner MG, et al: Evaluation of pH telemetry in the clinical study of gastric physiology. Amer Surg 35:836–844, 1969
Miller FA: Diagnosis of the acid peptic diathesis by continuous pH analysis. Surg Clin N Amer 47:1325, 1967
Noller HG: Proceedings of the Third International Conference on Medical Electronics. Clinical Applications of Telemetering Techniques. London, 1960, p 111
Rovelstad RA: Continuously recorded in situ pH of gastric and duodenal contents in patients with and without duodenal ulcers. Gastroenterology 31:530–537, 1956
Stack BHR: Use of the Heidelberg pH capsule in the routine assessment of gastric acid secretion. Gut 10:245, 1969
Watson WC, Paton E: Studies on intestinal pH by radiotelemetering. Gut 6:606–612, 1965
Yarbrough DR, McAlhany JC, Cooper N, et al: Evaluation of the Heidelberg pH capsule. Amer J Surg 117:185–192, 1969
Author information
Authors and Affiliations
Additional information
The authors would like to acknowledge the help of the departments of the Electronic Research Laboratory that were involved in the research and development work of this system.
Rights and permissions
About this article
Cite this article
Kunz, H.J., Norby, T.E. & Rogers, C.H. A pH-measuring radio capsule for the alimentary canal. Digest Dis Sci 16, 739–743 (1971). https://doi.org/10.1007/BF02239603
Issue Date:
DOI: https://doi.org/10.1007/BF02239603