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An extraluminal strain-gauge force transducer has been developed for recording contractile activity of the gastrointestinal smooth muscle. The details of its construction and implantation were described. The transducer unit allows for continuous long-term recordings (more the 5 months) from conscious experimental animals. It could be constructed in any laboratory and easily implanted in animals if it is done in aseptic technique. Since it is sutured onto the outside of the gut, it does not interfere passage of the contents. The only disadvantages are that it only measures muscle contractions and it is hard to determine movements of intraluminal contents especially in the digestive state.
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