Medical dressing to treat sucking chest wound

1. A medical dressing comprising:

a flexible base layer including a front surface configured to face a skin of a patient and a back surface opposite the front surface, wherein the flexible base layer includes a first opening;

an adhesive layer on the front surface of the base layer wherein the adhesive layer extends entirely around the first opening;

a flexible cover layer entirely covering the opening of the base layer; and

a flexible intermediate layer sandwiched between the base layer and the cover layer, wherein the intermediate layer includes a second opening aligned with the first opening;

wherein the base layer, cover layer and intermediate layer are joined together along an annular pattern extending entirely around the first and second openings, wherein the annular pattern joints the base layer to the intermediate layer entirely around the first and second openings, and the annular pattern joins the cover layer, intermediate layer and base layer around the first and second openings except at slots extending beyond an outer edge of the cover layer and ending before an outer edge of the intermediate layer.

2. The medical dressing of claim 1 , wherein the slots correspond to air channels between the cover layer and the intermediate layer.

3. The medical dressing of claim 2 , wherein the air channels extend radially from the first and second openings and are arranged symmetrically around the opening.

4. The medical dressing of claim 1 , wherein the annular pattern includes bridges each defining a radially outward end to a respective one of the slots and the bridges are aligned with the outer edge of the intermediate layer.

5. The medical dressing of claim 4 , wherein the annular pattern includes fingers extending radially outward from the outer edge of the cover layer and to at least the outer edge of the intermediate layer.

6. The medical dressing of claim 5 , wherein each of the fingers is adjacent another one of the fingers and is adjacent one of the slots.

7. The medical dressing of claim 1 , wherein the annular pattern includes a first annular region radially inward of the outer edge of the cover layer and the slots extend radially through the first annular region, wherein the second annular region extends from the outer edge of the cover layer to at least the outer edge of the intermediate layer, wherein the second annular region includes bridges extending in an arc direction across each of the slots.

8. The medical dressing of claim 7 , wherein the second annular region includes fingers each extending in a radial direction from the outer edge of the cover layer to at least the outer edge of the intermediate layer.

9. The medical dressing of claim 6 , wherein the fingers are each separated by gaps in the annular pattern from other ones of the fingers and from the bridges.

10. The medical dressing of claim 1 , wherein the cover layer is a circular disc, the intermediate layer is an annular ring, and the first and second openings are each circular.

11. The medical dressing of claim 1 , wherein the intermediate layer is a plurality of intermediate layers.

12. A medical dressing comprising:

a flexible base layer including a front surface configured to face a skin of a patient and a back surface opposite the front surface, wherein the flexible base layer includes a first opening;

an adhesive layer on the front surface of the base layer wherein the adhesive layer extends entirely around the opening;

a flexible cover layer entirely covering the opening of the base layer;

a flexible intermediate layer sandwiched between the base layer and the cover layer, wherein the intermediate layer includes a second opening aligned with the first opening; and

an annular pattern joining the base layer and intermediate layer entirely around the first and second openings and the pattern joins the cover layer, intermediate layer and base layer around the first and second openings except at slots extending beyond an outer edge of the cover layer and ending before an outer edge of the intermediate layer.

13. The medical dressing of claim 12 , wherein the slots correspond to air channels between the cover layer and the intermediate layer.

14. The medical dressing of claim 12 , wherein the annular pattern includes bridges each defining a radially outward end to a respective one of the slots and the bridges are aligned with the outer edge of the intermediate layer.

15. The medical dressing of claim 13 , wherein the air channels extend radially from the first and second openings and are arranged symmetrically around the opening.

16. The medical dressing of claim 14 , wherein the annular pattern includes fingers extending radially outward from the outer edge of the cover layer and to at least the outer edge of the intermediate layer.

17. The medical dressing of claim 12 , wherein the annular pattern includes a first annular region radially inward of the outer edge of the cover layer and the slots extend radially through the first annular region, wherein the second annular region extends from the outer edge of the cover layer to at least the outer edge of the intermediate layer, wherein the second annular region includes bridges extending in an arc direction across each of the slots.

18. The medical dressing of claim 17 , wherein the second annular region includes fingers each extending in a radial direction from the outer edge of the cover layer to at least the outer edge of the intermediate layer.

19. The medical dressing of claim 12 , wherein the cover layer is a circular disc, the intermediate layer is an annular ring, and the first and second openings are each circular.

20. The medical dressing of claim 12 , wherein the intermediate layer is a plurality of intermediate layers.