Wound dressing layer for improved fluid removal
A wound dressing layer may include an open-cell foam. The foam may have a 50% compression force deflection of not more than about 4.8 kPa. The foam may also have a density of at least 24 kg/m 3 . The foam may exhibit a density increase of a factor of at least 12 at about −75 mmHg.
1. A negative-pressure system for providing negative-pressure therapy to a tissue site, the system comprising:
a wound dressing layer comprising an open-cell foam having a 50% compression force deflection of not more than about 4.8 kPa, a density of at least 24 kg/m 3 , and exhibiting a density increase of a factor of at least 12 at about −75 mmHg; and
a cover configured to be placed over the wound dressing layer and attached to tissue surrounding the tissue site; and
a negative-pressure source configured to be fluidly coupled to the wound dressing layer.
2. The negative-pressure system of claim 1 , having a 50% compression force deflection of not more than about 4.5 kPa.
3. The negative-pressure system of claim 1 , having a 50% compression force deflection of not more than about 4.0 kPa.
4. The negative-pressure system of claim 1 , having a 50% compression force deflection of not more than about 3.5 kPa.
5. The negative-pressure system of claim 1 , having a 50% compression force deflection of not more than about 3.0 kPa.
6. The negative-pressure system of claim 1 , having a density of at least 28 kg/m 3 .
7. The negative-pressure system of claim 1 , having a density of at least 32 kg/m 3 .
8. The negative-pressure system of claim 1 , having a density of at least 36 kg/m 3 .
9. The negative-pressure system of claim 1 , having a density of at least 40 kg/m 3 .
10. The negative-pressure system of claim 1 , exhibiting a density increase of a factor of at least 5 at about −25 mmHg.
11. The negative-pressure system of claim 1 , exhibiting a density increase of a factor of at least 9 at about −50 mmHg.
12. The negative-pressure system of claim 1 , exhibiting a density increase of a factor of at least 14 at about −100 mmHg.
13. The negative-pressure system of claim 1 , exhibiting a density increase of a factor of at least 16 at about −125 mmHg.
14. The negative-pressure system of claim 1 , wherein the open-cell foam is hydrophobic.
15. The negative-pressure system of claim 1 , wherein the open-cell foam is formed from polyurethane.
16. The negative-pressure system of claim 1 , wherein the negative-pressure source is an open loop negative-pressure source.
17. The negative-pressure system of claim 1 , wherein the negative-pressure source is not configured to be controlled in response to a signal from a pressure sensor associated with a sealed space between the cover and the tissue site.
18. A method for providing negative-pressure therapy to a tissue site, the method comprising:
positioning a wound dressing layer comprising an open-cell foam having a 50% compression force deflection of not more than about 4.8 kPa, a density of at least 24 kg/m 3 , and exhibiting a density increase of a factor of at least 12 at about −75 mmHg proximate to the tissue site;
placing a sealing member over the wound dressing layer and sealing the sealing member to tissue surrounding the tissue site to form a sealed space;
fluidly coupling a negative-pressure source to the sealed space; and
operating the negative-pressure source to draw fluid from the tissue site through the wound dressing layer and generate a negative-pressure in the sealed space.
19. The method of claim 18 , wherein the negative-pressure system source does not receive feedback from a pressure sensor associated with the sealed space.
20. The method of claim 18 , wherein the negative-pressure source is an open loop negative-pressure source.