Cannula insertion mechanism for a patch device

A cannula insertion mechanism for a patch device, comprising

• a drive mechanism, comprising
• a base;
• a guide track formed in or on the base;
• a slider rotationally fixed relative to the base and configured to be slid along or in the guide track between a proximal slider end position and a distal slider end position, wherein the slider comprises a feed line with a lumen and is guided in or on the slider, through which a substance to be administered can be received, wherein, on a distal end of the slider, a cannula bridge is arranged, at which the feed line ends and on which a proximal end of an insertion cannula with a lumen is arranged, wherein the lumen of the feed line and the lumen of the insertion cannula are connected to one another such that the substance to be administered can be led from the feed line into the insertion cannula, and wherein the insertion cannula is shiftable along the slider in the distal direction and in the proximal direction;
• a drive wheel rotatably mounted on the base;
• a drive track coupled to the slider, the drive track comprising a plurality of drive sections, wherein a first drive section and a second drive section lie opposite each other or extend parallel to the guide track;
• an energy source, by means of which the drive wheel can be set into rotation relative to the base and the slider,
• wherein, upon rotation of the drive wheel, the slider is shifted from the proximal slider end position in the first drive section, along or in the guide track in a distal direction, and at a distal end of the first drive section, the drive wheel switches from the first drive section to the second drive section by a further rotation of the drive wheel, and the slider is shifted along or in the guide track in a proximal direction, and
• wherein the energy source can be coupled to the drive wheel by a one-piece or a multi-piece transmission element and an introduction wheel, wherein the introduction wheel is connected in a rotationally fixed manner to the drive wheel, and wherein the transmission element is arranged such that it can be shifted or rotated relative to the base,
• an infusion cannula with a distal and a proximal end, through which the insertion cannula can be guided, and
• wherein, on the proximal end of the infusion cannula, a cannula carrier is fixedly coupled, wherein, on the cannula carrier, a connecting means is arranged, via which the cannula carrier can be detachably connected to the cannula bridge when the insertion cannula is guided through the infusion cannula until the cannula carrier is in contact with the cannula bridge.

A drive mechanism for an insertion mechanism for an administration device, comprising:

• a base;
• a guide track formed in or on the base;
• a slider rotationally fixed relative to the base, wherein the slider is configured to be slid along or in the guide track between a proximal slider end position and a distal slider end position;
• a drive wheel rotatably mounted on the base;
• a drive track coupled to the slider, the drive track comprising a plurality of drive sections, wherein a first drive section and a second drive section lie opposite each other or extend parallel to the guide track;
• and
• an energy source configured to cause the drive wheel to rotate relative to the base and the slider,
• wherein, upon rotation of the drive wheel, the slider is shifted from the proximal slider end position in the first drive section, along or in the guide track in a distal direction, and at a distal end of the first drive section, the drive wheel switches from the first drive section to the second drive section by a further rotation of the drive wheel, and the slider is shifted along or in the guide track in a proximal direction,
• characterized in that the energy source can be coupled to the drive wheel by a transmission element and an introduction wheel, wherein the introduction wheel is connected in a rotationally fixed manner to the drive wheel, and wherein the transmission element is arranged such that it can be shifted or rotated relative to the base.