Esophageal pressure, bile content and pH are important parameters in gastroesophageal diseases. An all-optical technology is described capable to perform simultaneously oesophageal manometry, pH-metry and bilimetry. The three different sensors were integrated in a single optical fibre catheter for the simultaneous measurement of the three parameters. The optoelectronic prototype for the interrogation of the catheter is constituted by two separate optoelectronic modules for the interrogation of the pressure sensor and for the bile and pH sensors, respectively. The prototype and the optical catheter are compliant with European Directives on medical devices in terms of electromagnetic compatibility, electrical safety and biocompatibility.
Esophageal pressure, bile content and pH are important parameters in gastroesophageal diseases. An all-optical technology is described to perform simultaneously oesophageal manometry, pH-metry and bilimetry. The pressure measurement along the oesophagus is performed with 11 fibre optic gratings (FBGs) within a single mode fibre, which ensures monitoring every 2.5 cm along the oesophagus. The bile measurement is based on the direct absorption of bilirubin, the main biliary pigment, using a bundle of plastic optical fibres (POFs) carrying the signal. Regarding the detection of pH, an acid-base indicator that modifies its absorption as a function of pH is immobilized on glass particles with controlled porosity immobilized at the end of two POFs. The sensors are integrated in the same catheter for the simultaneous measurement of the three parameters. The prototype for the catheter interrogation was designed and developed, constituted by the integration of two optoelectronic modules for the interrogation of the pressure sensor and for the bile and pH sensors, respectively.
Esophageal pressure, bile content and pH in the gastroesophageal apparatus are important parameters to be monitored in gastroesophageal diseases. An all-optical device was developed for their simultaneous measurement and utilizes a catheter where plastic optical fibres for the measurement of bile and pH and a glass fibre with FBGs for pressure monitoring are integrated. The interrogation device contains two different modules: one for the pressure monitoring based on the measurement of the wavelength shift of the grating peaks, and the other one for bile and pH measurement, based on absorption changes caused by the esophageal content.
Esophageal pressure, bile content and pH in the gastroesophageal apparatus are important parameters to be monitored in gastroesophageal diseases. An all-optical device was developed for their simultaneous measurement and utilizes a catheter where plastic optical fibres for the measurement of bile and pH and a glass fibre with FBGs for pressure monitoring are integrated. The interrogation device contains two different modules: one for the pressure monitoring based on the measurement of the wavelength shift of the grating peaks, and the other one for bile and pH measurement, based on absorption changes caused by the esophageal content.
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