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1. System for inserting a self-expandable occluder into a patient and for releasing the occluder in the left atrial appendage of the patient, the system comprising the occluder, an insertion unit which has a drive unit and has an insertion catheter comprising an outer tube and an inner tube extending through the outer tube, wherein a proximal end region of the occluder is movement-coupled to the outer tube, wherein a distal end region of the occluder is movement-coupled to the inner tube, wherein, in order to release the occluder, the drive unit interacts with the inner tube and the outer tube such that, when actuated, the inner tube can be moved in a distal or proximal direction and the outer tube can be moved in the proximal direction or distal direction, so that the distal end and the proximal end of the occluder can be moved away from or toward one another, characterized in that the drive unit has a first transmission element that has a first transmission thread designed as an external thread, a second transmission element that has a second transmission thread designed as an external thread, and an actuating element that can be actuated by an operator and has a first drive thread designed as an internal thread that interacts with the first transmission thread and a second drive thread designed as an internal thread that interacts with the second transmission thread, wherein the first transmission element is movement-coupled to the inner tube, and wherein the second transmission element is movement-coupled to the outer tube, and in that the first transmission thread and the second transmission thread and the first and the second drive thread are designed such that, when the actuating element is actuated, the inner tube and the outer tube are each moved synchronously in the opposite distal or proximal direction by the same distance.
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