Infusion device and an adhesive sheet material and a release liner

1. An infusion device ( 1 ) comprising a housing ( 3 ) with an upper face plate ( 4 ) and a lower face plate ( 5 ) and a cannula ( 6 ) connected to the lower face plate ( 5 ) and through which a liquid is injected into the skin of a user; means for injecting the liquid, and an adhesive sheet material ( 101 ) placed in connection with the lower face plate ( 5 ) and for securing the infusion device ( 1 ) to the skin; said adhesive sheet material ( 101 ) comprising a backing layer ( 102 ) which has, on a portion of one surface, an adhesive layer ( 103 ); said adhesive layer ( 103 ) being covered by a removable release liner ( 104 ), said sheet and release liner ( 104 ) comprising a central aperture ( 105 ) through which the cannula ( 6 ) may act, characterized in that the release liner ( 104 ) comprises at least one score line ( 106 ) comprising a spiral or helix, that the starting point ( 107 ) for the score line ( 106 ) for stripping the release liner off of the adhesive layer ( 103 ) is placed in the periphery ( 108 ) of the release liner ( 104 ), and that the score line ( 106 ) is an unbroken line that does not intersect itself and continues to an end point ( 109 ) placed on the border of the periphery ( 110 ) of the release liners central aperture ( 105 ).

2. An infusion device ( 1 ) according to claim 1 , characterized in that the adhesive sheet ( 101 ) and release liner ( 104 ) are substantially circular.

3. An infusion device ( 1 ) according to claim 2 , characterized in that the release liner ( 104 ) comprises a tab ( 113 ) for gripping the release liner ( 104 ) and starts the stripping from the starting point ( 107 ).

4. An adhesive sheet material ( 101 ) comprising a backing layer ( 102 ) which has, on a portion of one surface, an adhesive layer ( 103 ), said adhesive layer ( 103 ) being covered by a removable release liner ( 104 ), said sheet and release liner ( 104 ) comprising a central aperture ( 105 ), characterized in that the release liner ( 104 ) also comprises at least one score line ( 106 ) comprising a spiral or helix, that the starting point ( 107 ) for the score line ( 106 ) for stripping the release liner off the adhesive layer ( 103 ) is placed in the periphery ( 108 ) of the release liner ( 104 ), and that the score line ( 106 ) is an unbroken line that does not intersect itself and continues to an end point placed on the border of the periphery ( 110 ) of the release liner's central aperture ( 105 ).

5. An adhesive sheet material ( 101 ) according to claim 4 , characterized in that the adhesive ( 101 ) sheet and the release liner ( 104 ) are substantially circular.

6. An adhesive sheet material ( 101 ) according to claim 5 , characterized in that the release liner ( 104 ) comprises a tab ( 113 ) for gripping the release liner ( 104 ) and starts the stripping from the starting point ( 107 ).

7. A release liner ( 104 ) for covering an adhesive sheet material ( 101 ), wherein said adhesive sheet material ( 101 ) comprises a backing layer ( 102 ) which has, on a portion of one surface, an adhesive layer ( 103 ), said adhesive layer ( 103 ) being covered by the removable release liner ( 104 ), characterized in that the release liner ( 104 ) comprises a central aperture and at least one score line ( 106 ) comprising a spiral or helix, that the starting point ( 107 ) for the score line ( 106 ) for stripping the release liner off the adhesive layer ( 103 ) is placed in the periphery ( 108 ) of the release liner ( 104 ), and that the score line ( 106 ) is an unbroken line that does not intersect itself and continues to an end point placed on the border of the periphery ( 110 ) of the release liner's central aperture ( 105 ).

8. A release liner ( 104 ) according to claim 7 , characterized in that the release liner ( 104 ) is substantially circular.

9. A release liner according to claim 8 , characterized in that the release liner ( 104 ) comprises a tab ( 113 ) for gripping the release liner ( 104 ) and starts the stripping from the starting point ( 107 ).

10. The infusion device according to claim 1 wherein the release liner comprises a tab for gripping the release liner and starts the stripping from the starting point.

11. The adhesive sheet material according to claim 4 , wherein the release liner comprises a tab for gripping the release liner and starts the stripping from the starting point.

12. The release liner according to claim 7 , wherein the release liner comprises a tab for gripping the release liner and starts the stripping from the starting point.