초록 ▼

A pulsed insulation system for administering an insufflation procedure includes a controller programmed to have a multi-mode operation. The controller switches the insufflation system to adjust an insufflation pressure to a nominal value in a first mode of operation of the controller. Upon encounter

A pulsed insulation system for administering an insufflation procedure includes a controller programmed to have a multi-mode operation. The controller switches the insufflation system to adjust an insufflation pressure to a nominal value in a first mode of operation of the controller. Upon encountering an obstruction by a Veress needle, the controller switches the insufflation system in a second mode, so as to adjust the insufflation pressure to a maximum target value and to have an interruption phase of pulse controllably increased. The interruption phase of pulse in the second mode is extended so as to enable a pressurized fluid accumulated at an upstream end of the Veress needle to dissipate therethrough before a measurement of the intracavity pressure is made.

대표청구항 ▼

1. An apparatus for controlling the flow of pressurized fluid inflating a body cavity in a pulsed insufflation system, wherein each pulse is characterized by a filling and interruption phase, comprising:a source of pressurized fluid flowing along a path; a needle in flow communication with the sourc

1. An apparatus for controlling the flow of pressurized fluid inflating a body cavity in a pulsed insufflation system, wherein each pulse is characterized by a filling and interruption phase, comprising:a source of pressurized fluid flowing along a path; a needle in flow communication with the source and the body cavity; a continuously adjustable pressure regulator along the path between the source and the needle for selectively supplying a nominal pressure Pnom and a maximum pressure Pmax, which is greater than the nominal pressure (Pmax>Pnom); a controller for measuring a pressure of pressurized fluid Pins delivered through the needle and having a central processing unit with a program executing thereon for switching the pressure regulator between first and second modes, the program switching the pressure regulator to the first mode to supply a nominal pressure in response to a first signal generated by the controller and representing a difference between measured and nominal pressures to be at most equal to a preset pressure value Pset (Pins-Pnom.ltoreq.Pset), the program switching the pressure regulator to the second mode to supply Pmax in response to a second signal signifying encounter of the needle with an obstruction and representing the difference between the measured and nominal pressures to be greater than the preset pressure value (Pins-Pnom>Pset), the interruption phase of the insufflation cycle in the second mode being longer than that one of the first mode, so as to allow a volume of the pressurized fluid accumulated upstream from the needle to decay through it, thereby accurately measuring an intra-cavity pressure Pabd at the end of this interruption phase.