Three-dimensional object-oriented modeling of the stomach for the purpose of microprocessor-controlled functional stimulation.

Three-dimensional (3-D) object-oriented models are needed for optimizing gastric electrical stimulation by performing virtual computer experiments. The aim of the study was to create a 3-D object-oriented electromechanical model of the stomach in vivo for the purpose of microprocessor controlled functional stimulation. The stomach was modeled using coaxial truncated conoids as objects.

Electrical activity from colon overlaps with normal gastric electrical activity in cutaneous recordings.

The stability of EGG recordings is affected by a variety of artifacts. The aim of this study was to investigate possible overlapping of dominant frequencies in recorded cutaneous electrical activity arising simultaneously from the stomach and/or colon. Ten normal volunteers, eight posttotal colectomy patients, and four patients posttotal gastrectomy were studied.

Microprocessor-controlled colonic peristalsis: dynamic parametric modeling in dogs.

The study aimed at completing a model of functional colonic electric stimulation and testing it for artificial recreation of peristalsis in dogs. Dynamic measurements of invoked single contractions obtained from two unconscious dogs as well as previously reported static contraction properties were utilized to suggest the optimal stimulation parameters of: (1) length of the stimulating electrodes, (2) separation between the successive electrode sets, (3) duration, and (4) phase lag between the stimuli sequentially applied to the electrode sets. The derived electrode configuration and stimulation pattern were adjusted for different anatomical dimensions and tested in distended colon full of viscous content.