Patent ID: 11931546
Assignee: FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  G | IPC A  G

Claim 17:
18. A medical syringe pump, comprising
a syringe receptacle configured to receive a syringe comprising a syringe cylinder and a plunger that is movable within the syringe cylinder between a first end position and a second end position, wherein the plunger is connected to a plunger rod;
a slide movable in motor steps and having a toggle for receiving a section of the plunger rod or for connecting thereto, wherein a section of the slide is arranged to be movable maximally between a first end stop and a second end stop relative to the syringe receptacle, and wherein the syringe pump is configured to move the slide in motor steps;
a counting device for counting the number of motor steps by which the slide is being moved;
a first sensor and a second sensor, both arranged along a shifting path of the plunger or along a travel or movement path of the slide;
a control device configured for moving the slide according to control instructions;
a storage device; and
an input device for entering control instructions and/or other data by a user,
wherein the control device is configured to execute a calibration method comprising:
a) moving, at a first speed, a section of the slide to a position between the first sensor and the second sensor;
b) moving, at a second speed, the toggle by the slide such that the plunger, when a syringe is inserted, would reach or come to a first end position, or until a predetermined section of the slide, reaches the first end stop,
wherein, when the predetermined section of the slide reaches or passes by the position of the second sensor, the number of motor steps given or output for or at this position by the counting device is determined as a first count value, and
wherein, when the plunger reaches the first end position or when the section of the slide reaches the first end stop, the motor steps, which have been counted by the counting device until reaching the position of the first end position or of the first end stop are determined as a second count value;
c) calculating a calibration value for the second sensor based on the first count value and the second count value;
d) storing, by the storage device, the calibration value for the second sensor;
e) moving the toggle at the second or a third speed towards the second end position;
f) determining the number of motor steps output by the counting device as a third count value upon reaching the position of the first sensor or passing it by the predetermined section of the slide;
g) calculating a calibration value for the first sensor based on the third count value; and
h) storing, by the storage device, the calibration value for the first sensor.