An extraluminal strain gage force transducer: its construction and implantation
Itoh, Z.
Nihon Heikatsukin Gakkai Zasshi 13(1): 33-43
1977
ISSN/ISBN: 0374-3527 PMID: 559862 Document Number: 114132
Extraluminal strain gauge force transducers were designed and constructed in this laboratory. This device was originally developed to measure contractile force of the heart by Walton et al. Durability and waterproofing of the transducer were emphasized in the present study. Strain gauges which were made for measuring large strain were prepared and bonded onto the both surfaces of CuBe strips with epoxy resin. Waterproofing was achieved by applying silicone (KE 45 RTV), which was excellent in waterproof, insulation and flexibility. The silicone had no significant influence upon the surrounding tissues as a foreign body. The transducer constructed in this way had useful life for 3-6 mo. after implantation. Chronically implanted transducer units offer several advantages: they provide prolonged observation of gastrointestinal mechanical activity directly in conscious animals. They can be sutured on the outer surface of the gastrointestinal tract and do not interfere with flow of intraluminal contents. They can measure separate contractile force of the circular and longitudinal muscle layers. The major limitation of the transducer is difficulty to determine if a given sequence of movements are mixing or propulsion of the contents. Application of these transducers is currently limited to animals.