Medical pump with improved desufflation

Abstract

The present invention relates to an insufflator for laparoscopy, comprising a suction pump, the suction pump being connected to the patient through a separate hose and permitting a controlled ventilation.

1 . An insufflation device for use in medical engineering comprising
 an insufflator for gas supply with a gas source,   a controller unit,   an insufflation line and a separate desufflation line,   wherein the desufflation line is connected to a suction pump,   wherein the insufflation line and the desufflation line have one pressure sensor and one volume flow sensor each,   wherein the insufflator comprises a device for controlled ventilation of the gas present in the patient,   wherein the controller unit controls the power of the suction pump as a function of the pressure measurement of the pressure sensors,   wherein the controller unit contains an activation blocking system that prevents an activation of the suction pump, when the pressure measured by means of the pressure sensor in the insufflation line is lower than a preset threshold value,   wherein the activation blocking system further   prevents an activation of the suction pump, when the pressure measured by means of the pressure sensor in the insufflation line and the pressure measured by means of the pressure sensor in the ventilation line are not identical.   
     
     
         2 . The insufflation device for use in medical engineering according to  claim 1 , wherein the threshold value is lower than 5 mm Hg. 
     
     
         3 . The insufflation device for use in medical engineering according to  claim 1 , wherein the threshold value is lower than 3 mm Hg. 
     
     
         4 . The insufflation device for use in medical engineering according to  claim 1 , wherein the controller unit cyclically deactivates the suction pump, and during the suction pauses compares the pressure values of the two pressure sensors, wherein only with identical values the suction pump is activated again. 
     
     
         5 . The insufflation device for use in medical engineering according to  claim 1 , wherein the controller unit puts the sucked—off volume in relation to the decreasing abdominal pressure and wherein the controller unit deactivates the suction pump, when this relation does not correspond to an expected value. 
     
     
         6 . The insufflation device for use in medical engineering according to  claim 5 , wherein the controller unit determines and stores the expected value of the relation of sucked-off volume to decreasing abdominal pressure during the insufflation phase by measurement of the abdominal pressure rise to the relation of the insufflated volume during the insufflation phase. 
     
     
         7 . The insufflation device for use in medical engineering according to  claim 1 , wherein the controller unit continuously activates the suction pump, and estimates the pressure of the abdomen using the pressure sensor of the desufflation line by means of a mathematical observer model and compares it to the pressure of the pressure sensor in the insufflation line, only with identical values the suction pump remaining activated. 
     
     
         8 . The insufflation device for use in medical engineering according to  claim 7 , wherein the mathematical observer model is configured in the manner of a Luenberger observer. 
     
     
         9 . The insufflation device for use in medical engineering according to  claim 1 , wherein the desufflation line is connected to a cylindrical trocar, the cylindrical trocar being configured such that it comprises recesses in the cylinder wall. 
     
     
         10 . A method for controlled ventilation of the gas present in the patient after a surgery, by means of a device according to  claim 1 , wherein
 a) the controller unit activates the suction pump only when the pressure measured by means of the pressure sensor in the insufflation line is higher than a preset threshold value,   and   b) the controller unit activates the suction pump only when the pressure measured by means of the pressure sensor in the insufflation line and   the pressure measured by means of the pressure sensor in the ventilation line are identical, and   c) the controller unit discontinuously activates the suction pump, and verifies the pressure values during the suction pauses.   
     
     
         11 . The method for controlled ventilation of the gas present in the patient after a surgery by means of a device according to  claim 1 , wherein
 the controller unit continuously activates the suction pump, and determines the abdominal pressure using the pressure sensor of the desufflation line, the pressure being estimated by a mathematical observer model.   
     
     
         12 . The method according to  claim 10 , wherein the suction rate is 1 to 5l/min. 
     
     
         13 . The method according to  claim 10 , wherein the desufflation is stopped, once the abdominal pressure is 5, 4 or 3 mmHg. 
     
     
         14 . The method according to  claim 10 , wherein the threshold value is larger than 5 mmHg. 
     
     
         15 . The method according to  claim 10 , wherein the threshold value is larger than 3 mmHg.