System for withdrawing body fluid

1. A system for withdrawing body fluid from a body part via a withdrawal site located on the surface of the body part, the system comprising:

at least one sensor for detecting at least one variable dependent on the location or state of the withdrawal site;

an evaluation unit for evaluating the at least one variable detected by the at least one sensor and for triggering a reaction, dependent on the value of the detected variable, in the system for withdrawing body fluid, said reaction serving to prepare the system for the withdrawal of body fluid; and

at least one puncturing device for creating an opening in the body at the withdrawal site; wherein the system further comprises a compression unit for increasing the internal pressure in the area of the withdrawal site in a lateral direction when collecting the body fluid, in such a way that body fluid is expressed out of the opening.

2. The system of claim 1 , wherein the sensor comprises a sensor for detecting at least one of the variables of temperature, electrical resistance, electrical conductivity, electrical current strength, electrical voltage, position, inclination, pressure, acceleration, and optical variables.

3. The system of claim 1 , wherein the sensor comprises a temperature sensor for detecting the skin temperature on the surface of the body part at the withdrawal site.

4. The system of claim 1 , wherein the sensor comprises a sensor for detecting the electrical resistance or the electrical conductivity of skin on the surface of the body part at the withdrawal site.

5. The system of claim 1 , wherein the sensor comprises a position or inclination sensor for detecting the position or inclination of the system upon contact with the withdrawal site.

6. The system of claim 1 , wherein the sensor comprises a pressure sensor for detecting the pressure with which a press-on area of the system is applied to the surface of the body part at the withdrawal site.

7. The system of claim 1 , wherein the sensor comprises an inductive, optical or capacitive proximity sensor for detecting the distance of the withdrawal site, located on the surface of the body part, from a press-on area of the system.

8. The system of claim 1 , wherein the evaluation unit is adapted to trigger at least one of the following reactions dependent on the value of the at least one detected variable:

blocking or releasing of the at least one puncturing device;

setting the puncture depth of the puncturing device selected for creating the opening in the body;

setting the geometric shape of a press-on area of the system for withdrawing body fluid;

setting the cross section of an opening in a press-on area of the system for withdrawing body fluid, through which opening the puncturing device can penetrate into the surface of the body part;

selecting one of at least two press-on areas included in the system for withdrawing body fluid;

selecting one of at least two puncturing devices contained in the system for withdrawing body fluid;

setting the duration of the withdrawal procedure;

displaying text on a display device; and

displaying or setting evaluation parameters which are used by a device for analyzing the body fluid.

9. The system of claim 1 , wherein at least one sensor is arranged in a press-on area of the system for withdrawing body fluid.

10. An integrated analysis system comprising the system for withdrawing body fluid from a body part according to claim 1 and a device for analyzing at least one property of the body fluid.

11. The integrated analysis system of claim 10 wherein the system is adapted for withdrawing blood or interstitial fluid and for analyzing the glucose content in the blood or in the interstitial fluid.