The invention discloses an optical-
fiber piezometric
catheter for detecting a
digestive tract as well as a preparation method and application. The optical-
fiber piezometric
catheter mainly comprises a sensing
optical fiber, a protective sleeve, a
polymer encapsulating layer and a medical
catheter, wherein the sensing
optical fiber contains a sensing area and a non-sensing area; the
polymer encapsulating layer encapsulates the sensing area of the sensing
optical fiber; the protective sleeve encapsulates the non-sensing area of the sensing optical
fiber; the medical catheter encapsulates the part, needing to enter a
human body and encapsulated by the
polymer encapsulating layer and the protective layer, of the sensing optical fiber. Micro-structural sensing units which are arranged repeatedly are engraved in the sensing area of the sensing optical fiber. The micro-structural sensing units contain the information of spectral central reflection wavelengths and repetition frequency information, realizes
wavelength-division and frequency-division dual coding, improves
multiplexing capacity, and realizes detecting the pressure of different positions of the
digestive tract through a
wavelength-division and frequency-division dual coding
demodulation technique. The optical-fiber piezometric catheter for detecting the
digestive tract has the advantages of long measurement length,
high resolution and sensitivity, low manufacturing cost and better comfort.