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Recording forces exerted on the bowel wall during colonoscopy: in vitro evaluation

A novel system for distributed force measurement between the bowel wall and the shaft of a colonoscope is presented. The system, based on the piezoresistive method, involves the integration of soft miniature transducers to a colonoscope to enable a wide range of forces to be sensed. The attached sen...

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Bibliographic Details
Published in:The international journal of medical robotics + computer assisted surgery 2005-12, Vol.1 (4), p.89-97
Main Authors: Dogramadzi, S, Virk, G S, Bell, G D, Rowland, R S, Hancock, J
Format: Article
Language:English
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Summary:A novel system for distributed force measurement between the bowel wall and the shaft of a colonoscope is presented. The system, based on the piezoresistive method, involves the integration of soft miniature transducers to a colonoscope to enable a wide range of forces to be sensed. The attached sensing sheath does not restrict the propulsion of the colonoscope nor notably alter its flexibility. The addition of the sensor sheath increases the colonoscope diameter by 15–20% depending on the type of the colonoscope (adult or paediatric). The transducer's accuracy is ±20 grammes if it is not subjected to extensive static forces. Under large static force conditions the errors may increase to ±50 grammes. The tactile force measuring sensors have provided preliminary results from experiments on a model of the large bowel. The force measurements confirm the predictions on the location and magnitude of the forces and that most of the forces are exerted whilst the instrument is looping. Copyright © 2005 John Wiley & Sons, Ltd.
ISSN:1478-5951
1478-596X
DOI:10.1002/rcs.61