Rotatable infusion set

1. An arrangement for introducing a liquid to the body of a patient or for withdrawing a liquid from the body of a patient, comprising:

a connector of a conduit for supplying or withdrawing liquid, the conduit coupled to a delivery cannula;

a first structural part with a cannula protruding therefrom for arrangement in the body of the patient, the first structural part formed by a circular plate element and a central body; and

a second structural part with a spring-elastic latching arm coupled to a connection port for detachable coupling of the connector;

wherein the first structural part and the second structural part are configured and connected to one another such that they can be rotated relative to one another and in every relative position form a channel for introducing a liquid from the connection port to the cannula or for withdrawing a liquid from the cannula to the connection port, and wherein the conduit and the cannula are connected by the channel beginning at a distal end of the conduit and ending at a proximal end of the cannula;

wherein:

the connection port is designed such that the coupling and uncoupling of the connector associated with the conduit takes place in a direction transverse to the longitudinal axis of the cannula, and wherein the channel extends from an end of the delivery cannula which is farthest from the conduit, extending in the direction transverse to the longitudinal axis of the cannula to provide a liquid-tight connection between the cannula and the end of the delivery cannula which are separated in the direction transverse to the longitudinal axis of the cannula; and

the connector comprises opposing retaining arms configured such that when the connector is set on the connection port, the retaining arms catch behind opposing stop cams which comprise projections extending up from the second structural part to substantially prevent unintentional uncoupling of the connector, and the connector prevents the latching arm from deviating upward and the first and the second structural parts are latched in a position; and

the spring-elastic latching arm rests on a corrugated surface contour of the plate element to form a ratchet mechanism such that the first structural part and second structural part can be rotated relative to one another when the connector is not set on the connection port.

2. The arrangement as claimed in claim 1 , wherein the first structural part and the second structural part are further configured and connected to one another such that they are inseparable.

3. The arrangement as claimed in claim 1 , wherein the first and the second structural part can be rotated relative to one another about an axis of rotation extending parallel to the longitudinal axis of the cannula.

4. The arrangement as claimed in claim 1 , wherein the cannula projects vertically or non-vertically from a substantially flat outside surface of the first structural part and the first and the second structural part can be rotated relative to one another by an axis of rotation extending vertically to the surface.

5. The arrangement as claimed in claim 1 , wherein the first and the second structural part can be rotated relative to one another by one of 360° or less than 360°.

6. The arrangement as claimed in claim 1 , wherein the connection between the first and the second structural part is designed such that specific torque must be overcome for counterrotation of said structural parts.

7. The arrangement according to claim 6 , wherein the torque ranges between 0.01 and 0.05 Nm.

8. The arrangement according to claim 6 , wherein the torque ranges between 0.01 and 0.1 Nm.

9. The arrangement as claimed in claim 6 , further comprising a pre-tensed elastic seal for generating the torque to be overcome.

10. The arrangement as claimed in claim 1 , wherein the first and the second structural parts are latched in position relative to one another if the connector is set on the connection port.

11. The arrangement as claimed in claim 1 , wherein the cannula is a flexible cannula and a removable guide needle is forceable through the cannula to enable the cannula to be inserted into the tissue of a patient.

12. The arrangement as claimed in claim 11 , wherein an outside surface of the first structural part from which the cannula extends carries an adhesive layer for fastening the first structural part to the skin of a patient.

13. The arrangement as claimed in claim 1 , further comprising another connector for coupling another conduit for supplying or withdrawing a liquid.

14. The arrangement as claimed in claim 1 , wherein when the connector is coupled to the connection port the connector mechanically interacts with either or both of the first and second structural parts such that the first and second structural parts are blocked from rotating relative to one another.

15. The arrangement as claimed in claim 1 , wherein the retaining arms are elastically deformable.

16. An arrangement for introducing a liquid to the body of a patient or for withdrawing a liquid from the body of a patient, comprising:

a connector of a conduit for supplying or withdrawing liquid;

a first structural part with a cannula protruding therefrom for arrangement in the body of the patient, the first structural part formed by a circular plate element and a central body; and

a second structural part with a spring-elastic latching arm coupled to a connection port for detachable coupling of the connector, one of the first structural part and the second structural part comprising a surface having a plurality of depressions arranged therein, and the other of the first structural part and the second structural part configured for engaging the plurality of depressions to form a ratchet mechanism,

wherein the first structural part and the second structural part are configured and connected to one another such that they can be rotated against one another against a force defined by the ratchet mechanism, and in every relative position form a channel for introducing a liquid from the connection port to the cannula or for withdrawing a liquid from the cannula to the connection port, and wherein the conduit and the cannula are connected by the channel beginning at a distal end of the conduit and ending at a proximal end of the cannula;

wherein the connection port is designed such that the coupling and uncoupling of the connector takes place in a direction transverse to the longitudinal axis of the cannula, and wherein the channel extends from an end of the delivery cannula which is farthest from the conduit, extending in the direction transverse to the longitudinal axis of the cannula to provide a liquid-tight connection between the cannula and the end of the delivery cannula which are separated in the direction transverse to the longitudinal axis of the cannula; and

wherein the connector comprises opposing retaining arms configured such that when the connector is set on the connection port, the retaining arms catch behind opposing stop cams which comprise projections extending up from the second structural part to substantially prevent unintentional uncoupling of the connector, and the connector prevents the latching arm from deviating upward and the first and the second structural parts are latched in a position; and

the spring-elastic latching arm rests on a corrugated surface contour of the plate element to form the ratchet mechanism for the relative rotation of the first structural part and the second structural part when the connector is not set on the connection port.

17. An arrangement for introducing a liquid to the body of a patient or for withdrawing a liquid from the body of a patient, comprising:

a connector of a conduit for supplying or withdrawing liquid, the connector comprising a delivery cannula;

a first structural part comprising a cannula protruding therefrom for arrangement in the body of the patient, the first structural part formed by a circular plate element and a central body; and

a second structural part with a spring-elastic latching arm coupled to a connection port for detachable coupling of the connector, the connection port forming a portion of a fluid path to the cannula,

wherein the first structural part and the second structural part are configured and connected to one another such that they can be rotated relative to one another and in every relative position form a channel for introducing a liquid from the connection port to the insertion cannula or for withdrawing a liquid from the cannula to the connection port, and wherein the conduit and the cannula are connected by the channel beginning at a distal end of the conduit and ending at a proximal end of the cannula, and wherein the channel extends from an end of the delivery cannula which is farthest from the conduit, extending in the direction transverse to the longitudinal axis of the cannula to provide a liquid-tight connection between the cannula and the end of the delivery cannula which are separated in the direction transverse to the longitudinal axis of the cannula;

wherein the connection port is configured such that the connector and delivery cannula are coupled thereto in the direction transverse to the longitudinal axis of the cannula; and

wherein the connector comprises opposing retaining arms configured such that when the connector is set on the connection port, the retaining arms catch behind opposing stop cams which comprise projections extending up from the second structural part to substantially prevent unintentional uncoupling of the connector, and the connector prevents the latching arm from deviating upward and the first and the second structural parts are latched in a position; and

the spring-elastic latching arm rests on a corrugated surface contour of the plate element to form a ratchet mechanism for the relative rotation of the first structural part and the second structural part when the connector is not set on the connection port.

18. The arrangement as claimed in claim 17 , wherein the fluid path is sealed by a septum and upon coupling of the connector to the connection port the delivery cannula pierces the septum in a direction substantially transverse to the longitudinal axis of the cannula.

19. The arrangement as claimed in claim 17 , wherein the retaining arms all are elastically deformable from between a compressed position in which the connector is coupled to the connection port and a relaxed position in which the retaining arms engage the stop cams.