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Development of a computer‐controlled tensiometer for real‐time measurements of tension in tubular organs
Author(s) -
Gregersen,
Barlow,
Daniel Thompson
Publication year - 1999
Publication title -
neurogastroenterology and motility
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.489
H-Index - 105
eISSN - 1365-2982
pISSN - 1350-1925
DOI - 10.1046/j.1365-2982.1999.00144.x
Subject(s) - tensiometer (surface tension) , surface tension , tension (geology) , volume (thermodynamics) , distension , syringe driver , inflatable , chemistry , materials science , biomedical engineering , mechanics , composite material , compression (physics) , surgery , thermodynamics , engineering , medicine , physics , mechanical engineering , organic chemistry , syringe
A computer‐controlled tensiometer for studying wall tension in tubular organs has been developed. The system consisted of a probe with an inflatable balloon, an impedance planimeter, pressure transducer and amplifier, a pump with RS232 interface and a PC with dedicated software. Circumferential wall tension was computed in real time from pressure and cross‐sectional area measurements (tension measurement mode). Wall tension can be maintained on a preset level or be changed as a step or ramp function by a feedback control of the infusion/withdrawal pump (tension control mode). A software regulator adjusted the volume rate (low volume rate when the computed tension was close to the preset value) to minimize overshoot and oscillation. Validation tests were performed and the technique was applied in the human oesophagus. Volume‐ and tension‐controlled balloon distensions elicited secondary peristalsis of increasing intensity that was decreased significantly by the antimuscarinic agent Hyoscine butyl bromide. In tension control mode Hyoscine butyl bromide caused oesophageal relaxation, i.e. CSA to increase and pressure to decay. Furthermore, pronounced pressure relaxation and tension relaxation were observed during volume‐controlled distension after administration of Hyoscine butyl bromide.