Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-11-30
1998-07-07
Rimell, Sam
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604131, A61M 3700
Patent
active
057761043
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method and a device for supplying a liquid at a determined pressure to a body cavity of a person or an animal for the purpose of an endoscopic examination or operation, the liquid being supplied from a source contained in a watertight and sterile flexible bag, connected to the said cavity by a watertight and sterile tube.
BACKGROUND OF INVENTION
The number of endoscopic examinations and operations is growing constantly. In order to obtain a good image of the body's cavity to be observed or in which one wants to operate, one generally feeds biological liquid to this cavity, the role of which may be to inflate the cavity and to evacuate the material coming from a tissue resection which, otherwise, would quickly render the operating field opaque. The feed pressure is essentially variable, depending on the tissues forming the cavity to be observed or to be operated on. The maintenance of constant pressure is of great importance, as an increase as well as a decrease of pressure in the cavity can lead to serious repercussions for the patient. In fact, excessive pressure may cause infiltrations of the liquid into the patient's body and damage to the cavity itself. A depression can have other results which are just as serious. If, for instance, during the resection of a tumor on a bladder wall, done by means of electric resistance, a sudden decrease in pressure could, in an untimely manner, cause the bladder wall to come into contact with the heating element and be pierced, with all the serious consequences this would entail.
To measure the pressure of the liquid in the supply tube, a pressure sensor is installed in the supply tube. Such a sensor, however, poses a problem. One must, in fact, create a column of air in order to measure its pressure. To this end, the sensor must be installed at the end of a lateral tube, placed above the liquid level, and one measures the pressure of the air trapped in this lateral tube. To avoid any contact between the biological liquid and the sensor, a filter is installed at a certain distance from the sensor. The danger of this filter is that if it accidentally comes into contact with the liquid, some liquid will remain on the filter, and air bubbles will form in the tube, completely distorting the measurement. Since the risk of then seeing significant excessive pressure cannot be excluded, one must consider all the consequences that this would entail. The use of a security valve cannot be considered as, during the procedure, liquid could come into contact with nonsterile areas, which poses the risk of migration of microbial germs toward the irrigated cavity. Given these risks, some practitioners prefer to use the pressure created by a column of liquid, the height which is chosen according to the desired pressure. The drawback is that, depending on the desired pressure, there may not be enough vertical space in an operating room.
Until now, all irrigation devices operating with a pump used a peristaltic pump, which is the only pump in which no mechanical part come into contact with the liquid and is thus compatible with the sterility of the supply liquid. The drawback to these volumetric pumps is that sinusoidal pressure is created in the supply liquid. In some cases, this sinusoidal pressure variation is unacceptable, as in the case of an endoscopic operation on the uterine tube, where the pressure must be perfectly constant. Moreover, with a peristaltic pump equipped with a pressure sensor, there is always a reaction time, so the pressure can fluctuate, and, in reality, it fluctuates constantly.
SUMMARY OF INVENTION
The purpose of the present invention is to remedy these drawbacks, at least in part.
To this end, the purpose of the present invention is a method to supply a liquid at a determined pressure to a body cavity of a person or an animal, for the purpose of an endoscopic examination or operation, the liquid being supplied by a source contained in a watertight and sterile flexible bag, connected to the said ca
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Cottenceau Remi
Guignard Mireille
Zuercher Erwin
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