Medical gas insufflator with automatic gas flow control

Details Medical gas insufflator with automatic gas flow control Medical gas insufflator with automatic gas flow control

A - Human Necessities

61

M

A61M 13/00 (2006.01)

Patent

CA 2161342

Medical device for use in diagnostic and surgical endoscopy, comprises an insufflation path (4, 5, 6) for injecting a neutral gas into a surgical cavity (2), in conjunction with a pressurized neutral gas source, and a flow control pilot valve provided in said path. A means (18) for measuring the insufflation pressure (Pi) is provided at the beginning of the injection path (4, 5, 6). The pressure within the cavity (Pa) is calculated based on the insufflation pressure (P), by evaluating the load loss in the path. A comparison is made between the calculated pressure within the cavity (Pa) and the flow control valve (13) is guided as a fuction of the result of the comparison with the set value. The apparatus hence provides a minimum continuous neutral gas flow (D) to closely compensate the gas leaks occurring outside of the surgical cavity (2).

Cet insufflateur, destiné à l'endoscopie diagnostique et chirur- gicale, comprend un circuit d'insufflation (4, 5, 6) d'un gaz neutre dans une cavité opératoire (2), en relation avec une source (7) de gaz neutre sous pression, et sur ce circuit une vanne pilotée de régulation de débit (13). Des moyens de mesure (18) de la pres- sion d'insufflation (Pi) sont prévus en tête du circuit d'insufflation (4, 5, 6). La pression intracavitaire (Pa) est calculée à partir de la pression d'insufflation (Pi), par l'intermédiaire de l'évaluation de la perte de charge du circuit. Une comparaison est effectuée entre la pression intracavitaire (Pa) calculée et une valeur de consigne de cette pression intracavitaire, et la vanne de régulation de débit (13) est pilotée en fonction du résultate de la comparaison avec la valeur de consigne. L'appareil fournit ainsi en permanence un débit de gaz neutre (D) minimal pour compenser strictement les fuites de gaz hors de la cavité opératoire (2).

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