Rinsing device and method for the operation thereof
A rinsing device, in particular for endoscopy, comprising an electrically driven pump, in particular a peristaltic roller pump, as well as a method of operating such a device. A control device is provided to detect and/or adjust a flow rate. In order to avoid an excessively high pressure in case of an unintended stenosis, e.g. kinking of the supply tube, or also intended stenoses, e.g. insertion of a narrow rinsing probe, a current-measuring device is provided to detect a current being received by the pump. The control device is adapted such that when the flow rate exceeds a prespecified limiting value and at the same time the current exceeds a first predetermined current value, the flow rate is reduced to a safe flow-rate value.
1. A rinsing device for use in endoscopy, comprising:
an electrically driven pump that provides a rinsing flow rate;
a control device to adjust the rinsing flow rate;
an input device to enable a user to set a desired rinsing flow rate, wherein the desired rinsing flow rate may be set to a value higher than a predetermined limiting flow rate; and
a current-measuring device to detect and measure a first electrical current level driving the pump corresponding to the rinsing flow rate,
wherein the control device is adapted such that when the first electrical current level exceeds a second electrical current level corresponding to said predetermined limiting flow rate, the rinsing flow rate is reduced to a safe flow rate that is lower than said predetermined limiting flow rate,
wherein after reduction of said rinsing flow rate to said safe flow rate, said rinsing flow rate is increased at a predetermined rate of increase until said user set desired rinsing flow rate has been reached,
wherein the control device implements a timer interrupt service routine wherein the following steps are performed cyclically in a time-controlled manner to avoid rapid control oscillations:
determining whether said rinsing flow rate exceeds said predetermined limiting flow rate;
determining whether said rinsing flow rate was reduced previously; and
increasing said rinsing flow rate by said predetermined rate of increase if the rinsing flow rate was reduced previously and said rinsing flow rate has not reached the desired rinsing flow rate.
2. The rinsing device according to claim 1 , wherein said control device is adapted to cause said pump to be switched off and a warning signal to be generated when said first electrical current level exceeds a third electrical current level, which is higher than the second electrical current level.