Subcutaneous inserter device

1. An inserter device for subcutaneously inserting a medical device, the inserter device comprising:

an outer part comprising one or more locking elements and one or more release elements;

a housing; and

a functional part accommodated in the housing, wherein the housing comprises a sidewall with an inner surface forming a cavity, the housing comprising one or more housing guide members for engagement with one or more guide members of the functional part; wherein the functional part comprises:

a first part comprising one or more first locking members;

a second part releasably connected to the first part, the second part comprising a second guide member and one or more second locking members;

an insertion needle attached to the second part;

an insertion spring adapted for moving the second part from a first position to a second position to insert the insertion needle subcutaneously; and

a retraction spring adapted for moving the second part from the second position to a third position to retract the insertion needle;

wherein the one or more housing guide members and the second guide member are configured for rotating the second part when the second part is moved from the first position to the second position, whereby the second part is moved from a locked position to m unlocked position relative to the first part.

2. The inserter device according to claim 1 , wherein the one or more locking elements include two protrusions positioned on an annular engaging device extending inwards.

3. The inserter device according to claim 2 , wherein the one or more release elements include two surfaces positioned on the annular engaging device.

4. The inserter device according to claim 1 , wherein the one or more housing guide members include a wall extending from the sidewall into the cavity of the housing.

5. The inserter device according to claim 1 , wherein the one or more first locking members include protrusions on an outer surface of the first part.

6. The inserter device according to claim 1 , wherein the second guide member includes an inclining sidewall extending outwardly from an outer surface of the second part.

7. The inserter device according to claim 1 , wherein the one or more second locking members include protrusions extending outwardly from an outer surface of the second part.

8. The inserter device according to claim 1 , wherein the outer part includes an annular collar on an inside of the outer part, wherein the insertion spring at a first end encircles the annular collar.

9. The inserter device according to claim 1 , wherein the insertion spring at a second end encircles an outer section of the first part.

10. The inserter device according to claim 1 , wherein the first part includes an annular recess on an inside of the first part for supporting the retraction spring at a first end.

11. The inserter device according to claim 1 , wherein the retraction spring at a second end encircles an outer section of the second part.

12. The inserter device according to claim 1 , wherein the medical device includes a port site and a subcutaneous part for engaging inside an opening in the port site upon subcutaneous insertion of the medical device.

13. The inserter device according to claim 12 , wherein the first part exercises a pressure on the subcutaneous part when the second part is in the second position thereby locking the subcutaneous part inside the opening of the port site.

14. The inserter device according to claim 12 , wherein the first part exercises a pressure on the subcutaneous part when the second part is in the third position thereby preventing the subcutaneous part from departing from the port site upon extraction of the insertion needle.

15. An inserter device for subcutaneously inserting a medical device, the inserter device comprising:

an outer part;

a housing sized to be at least partially received by the outer part, wherein the housing includes one or more housing guide members; and

a functional part accommodated in the housing and having one or more guide members configured for engagement with the one or more housing guide members, the functional part including a first part, a second part releasably connected to the first part, an insertion needle attached to the second part, an insertion spring coupled between the outer part and the first part that is configured for extension to cause movement of the second part from a first position to a second position to insert the insertion needle subcutaneously, and a retraction spring coupled between the first part and the second part that is configured for extension to cause movement of the second part from the second position to a third position to retract the insertion needle,

wherein the first part and the second part are configured to contact one another to cause rotation of the second part relative to the first part during movement of the second part from the first position to the second position, and wherein rotation of the second part relative, to the first part drives movement of the second part relative to the first part from a locked position to an unlocked position.

16. The inserter device of claim 15 , wherein the medical device includes a port site and a subcutaneous part sized for receipt in an opening of the port site upon subcutaneous insertion of the medical device, and wherein the first part exercises a pressure on the subcutaneous part when the second part is in the second position to lock the subcutaneous part inside the opening of the port site.

17. The inserter device of claim 16 , wherein the first part exercises a pressure on the subcutaneous part when the second part is in the third position to prevent departure of the subcutaneous part from the port site upon extraction of the insertion needle.

18. An inserter device for subcutaneously inserting a medical device, the inserter device comprising:

an outer part;

a housing sized to be at least partially received by the outer part; and

a functional part accommodated in the housing, the functional part, including a first part having an inner wall, a second part releasably connected to the first part, wherein the second part includes an inclining guide member, an insertion needle attached to the second part, an insertion spring coupled between the outer part and the first part that is configured for extension to cause movement of the second part from a first position to a second position to insert the insertion needle subcutaneously, and a retraction spring coupled between the first part and the second part that is configured for extension to cause movement of the second part from the second position to a third position to retract the insertion needle,

wherein the inclining guide member of the second part is configured to contact the inner wall of the first part to cause rotation of the second part relative to the first part during movement of the second part from the first position to the second position, and wherein rotation of the second part relative to the first part drives movement of the second part relative to the first part from a locked position to an unlocked position.

19. The inserter device of claim 18 , wherein the medical device includes a port site and a subcutaneous part sized for receipt in an opening of the port site upon subcutaneous insertion of the medical device, and wherein the first part exercises a pressure on the subcutaneous part when the second part is in the second position to lock the subcutaneous part inside the opening of the port site.

20. The inserter device of claim 19 , wherein the first part exercises a pressure on the subcutaneous part when the second part is in the third position to prevent departure of the subcutaneous part from the port site upon extraction of the insertion needle.