Negative pressure wound therapy device with oxygen control
A system for negative pressure and hypoxic tissue therapy including a chemical pump assembly, a dressing to cover a tissue site, a plurality of hoses, and a cover layer to cover a portion of the dressing. Each hose is configured to fluidly connect the dressing to the assembly. Oxygen flows from the dressing to a reactor in the assembly where the oxygen is consumed by the reactor. The hoses have different cross-sectional areas and selectable lengths, and these can be selected to provide a desired amount of oxygen around the tissue site. The cover layer has less permeability to air that does the dressing, nd can be used to cover a portion of the dressing to inhibit the permeation of air through the dressing and thus provide the desired amount of oxygen around the tissue site.
1 . A system for controlling an amount oxygen in an enclosed volume, the system comprising:
a dressing configured to seal to tissue so as to define the enclosed volume between the dressing and the tissue;
a housing defining an inner chamber, and including a reactor located in the inner chamber, the reactor being configured to chemically react with oxygen in the inner chamber;
a fluid passage connecting the inner chamber and the enclosed volume allowing for a flow of oxygen between the inner chamber and the enclosed volume; and
a plurality of hoses having different lengths,
wherein the system is configured to allow a user of the system to select a predetermined level of oxygen to be attained in the enclosed volume by the user:
selecting a desired length of the fluid passage among a plurality of different lengths prior to the reactor being exposed to oxygen in the inner chamber, wherein the desired length corresponds to the predetermined level of oxygen to be attained in the enclosed volume, and selecting the desired length of the fluid passage includes selecting one hose from the plurality of hoses having the desired length, and connecting the one hose to the housing and to the dressing to at least partially define the fluid passage.
2 . A system for controlling an amount oxygen in an enclosed volume, the system comprising:
a dressing configured to seal to tissue so as to define the enclosed volume between the dressing and the tissue;
a housing defining an inner chamber, and including a reactor located in the inner chamber, the reactor being configured to chemically react with oxygen in the inner chamber;
a fluid passage connecting the inner chamber and the enclosed volume allowing for a flow of oxygen between the inner chamber and the enclosed volume; and
a hose,
wherein the system is configured to allow a user of the system to select a predetermined level of oxygen to be attained in the enclosed volume by the user:
selecting a desired length of the fluid passage among a plurality of different lengths prior to the reactor being exposed to oxygen in the inner chamber, wherein the desired length corresponds to the predetermined level of oxygen to be attained in the enclosed volume, and selecting the desired length of the fluid passage includes modifying the hose from an original length to a modified length.
3 . The system according to claim 2 , wherein the hose includes markings along a length of the hose indicating predetermined amounts of oxygen to be attained in the enclosed volume.
4 . A system for controlling an amount oxygen in an enclosed volume, the system comprising:
a dressing configured to seal to tissue so as to define the enclosed volume between the dressing and the tissue;
a housing defining an inner chamber, and including a reactor located in the inner chamber, the reactor being configured to chemically react with oxygen in the inner chamber;
a fluid passage connecting the inner chamber and the enclosed volume allowing for a flow of oxygen between the inner chamber and the enclosed volume; and
a plurality of hoses having different cross-sectional areas;
wherein the system is configured to allow a user of the system to select a predetermined level of oxygen to be attained in the enclosed volume by the user;
selecting a desired cross-sectional area of the fluid passage among a plurality of different cross-sectional areas, wherein the desired cross-sectional area corresponds to the predetermined level of oxygen to be attained in the enclosed volume, and selecting the desired cross-sectional area of the fluid passage includes selecting one hose from the plurality of hoses having the desired cross-sectional area and connecting the one hose to the housing and to the dressing to at least partially define the fluid passage.
5 . The system according to claim 4 , wherein the system includes a plurality of adapters, each of the plurality of adapters being configured to connect one of the plurality of hoses to the housing and to the dressing.
6 . The system according to claim 1 , wherein:
the system includes a hose connected to the housing and to the dressing to at least partially define the fluid passage;
the system includes a clamp; and
selecting the desired cross-sectional area of the fluid passage includes clamping the hose with the clamp so as to modify a cross-sectional area of the hose.
7 . A system for controlling an amount oxygen in an enclosed volume, the system comprising:
a dressing configured to seal to tissue so as to define the enclosed volume between the dressing and the tissue;
a housing defining an inner chamber, and including a reactor located in the inner chamber, the reactor being configured to chemically react with oxygen in the inner chamber;
a fluid passage connecting the inner chamber and the enclosed volume allowing for a flow of oxygen between the inner chamber and the enclosed volume; and
a hose connected to the housing and to the dressing to at least partially define the fluid passage,
wherein the system is configured to allow a user of the system to select a predetermined level of oxygen to be attained in the enclosed volume by the user:
selecting a desired cross-sectional area of the fluid passage among a plurality of different cross-sectional areas, wherein the desired cross-sectional area corresponds to the predetermined level of oxygen to be attained in the enclosed volume, and selecting the desired cross-sectional area of the fluid passage includes arranging a porous solid in the hose.
8 . The system according to claim 1 , wherein:
the system includes a cover layer for selectively covering a desired portion of the dressing to reduce an oxygen permeability of the dressing.
9 . The system according to claim 8 , wherein:
the cover layer includes a metalized polymer film; and
the cover layer is configured to be modified from an original size to a modified size that is less than the original size.
10 . The system according to claim 1 , wherein:
the housing includes a hose fitting and the dressing includes a dressing fitting; and
the hose fitting is configured for attaching a hose to the housing and the dressing fitting is configured for attaching the hose to the dressing such that the hose at least partially defines the fluid passage.
11 . The system according to claim 10 , wherein the hose fitting and the dressing fitting are each a barbed fitting.
12 . The system according to claim 2 , wherein:
the system includes a cover layer for selectively covering a desired portion of the dressing to reduce an oxygen permeability of the dressing.
13 . The system according to claim 4 , wherein:
the system includes a cover layer for selectively covering a desired portion of the dressing to reduce an oxygen permeability of the dressing.
14 . The system according to claim 7 , wherein:
the system includes a cover layer for selectively covering a desired portion of the dressing to reduce an oxygen permeability of the dressing.