Reduced-pressure dressings, systems, and methods with evaporative devices
View Patent ↗Wounds dressings, systems, and methods are presented for removing liquid from a wound site into a dressing and moving air through the dressing to evaporate at least a portion of the removed liquid. The air is moved in one instance by a Coanda device incorporated into the dressing. Other systems, dressings, and methods are presented.
1. A wound treatment system for treating a wound on a patient, the wound treatment system comprising:
a treatment manifold for disposing proximate to the wound, wherein the treatment manifold has a first side and a second, patient-facing side;
a first sealing member for disposing over the first side of the treatment manifold and a portion of intact skin to create a sealed space containing the treatment manifold, wherein the first sealing member comprises a high-moisture-vapor-transfer-rate drape;
an air-movement manifold having a first side and a second, patient-facing side, wherein the second, patient-facing side is disposed proximate to the first side of the first sealing member;
a second sealing member disposed over the first side of the air-movement manifold forming a channel space;
at least one port formed on the second sealing member for allowing air to exit the channel space;
a reduced-pressure source for producing reduced pressure, wherein the reduced-pressure source is fluidly coupled to the sealed space for delivering reduced pressure thereto;
a pressure source;
a Coanda device coupled to the second sealing member and fluidly coupled to the pressure source and to the channel space, wherein the Coanda device comprises:
an annular nozzle forming a central opening and having an interior passage and a nozzle opening, and
a Coanda surface proximate to and downstream from the nozzle opening, whereby fluid exiting the nozzle opening entrains additional fluid from the central opening and produces a combined fluid flow; and
wherein the Coanda device is fluidly coupled to a Coanda opening in the second sealing member.
2. The wound treatment system of claim 1 , further comprising a bacterial filter coupled to the at least one port.
3. The wound treatment system of claim 1 , wherein the Coanda device is configured to pull fluid from the Coanda opening thereby pulling fluid from the at least one port through the air-movement manifold and out the Coanda opening.
4. The wound treatment system of claim 1 , wherein the Coanda device is configured to push fluid into the Coanda opening thereby pushing fluid from the Coanda opening through the air-movement manifold and out the at least one port.
5. A wound treatment dressing for treating a wound on a patient, the wound treatment dressing comprising:
a treatment manifold for disposing on the wound, wherein the treatment manifold has a first side and a second, patient-facing side;
a first sealing member for disposing over the first side of the treatment manifold and a portion of intact skin to create a sealed space containing the treatment manifold, wherein the first sealing member comprises a high-moisture-vapor-transfer-rate drape;
an air-movement manifold having a first side and a second, patient-facing side, wherein the second, patient-facing side is disposed proximate to the first side of the first sealing member;
a second sealing member disposed over the first side of the air-movement manifold to form a channel space;
at least one port formed on the second sealing member to allow air to exit the channel space;
a Coanda device coupled to the second sealing member, wherein the Coanda device comprises:
an annular nozzle forming a central opening and having an interior passage and a nozzle opening, and
a Coanda surface position proximate to and downstream from the nozzle opening, whereby fluid exiting the nozzle opening entrains additional fluid from the central opening and produces a combined fluid flow; and
wherein the Coanda device is fluidly coupled to a Coanda opening in the second sealing member.
6. The wound treatment dressing of claim 5 , further comprising a bacterial filter coupled to the at least one port.
7. The wound treatment dressing of claim 5 , wherein the Coanda device is configured to pull fluid from the Coanda opening during operation thereby pulling fluid from the at least one port through the air-movement manifold and out the Coanda opening.
8. The wound treatment dressing of claim 5 , wherein the Coanda device is configured to push fluid into the Coanda opening during operation thereby pushing fluid from the Coanda opening through the air-movement manifold and out the at least one port.
9. A method for treating a wound on a patient, the method comprising:
disposing a treatment manifold proximate to the wound, wherein the treatment manifold has a first side and a second, patient-facing side;
covering the treatment manifold an a portion of intact skin with a first sealing member to create a sealed space containing the treatment manifold, wherein the first sealing member comprises a high-moisture-vapor-transfer-rate drape and has at least one port;
disposing an air-movement manifold proximate to the first sealing member;
disposing a second sealing member over the air-movement manifold to form a channel space;
fluidly coupling a reduced-pressure source to the sealed space for delivering reduced pressure thereto;
coupling a Coanda device to the second sealing member;
fluidly coupling the Coanda device to a pressure source and to the channel space;
wherein the Coanda device comprises:
an annular nozzle forming a central opening and having an interior passage and a nozzle opening, and
a Coanda surface proximate to and downstream from the nozzle opening, whereby fluid exiting the nozzle opening entrains additional fluid from the central opening and produces a combined fluid flow; and
fluidly coupling the Coanda device to a Coanda opening in the second sealing member; and
providing positive pressure to the Coanda device to cause fluid flow within the air-movement manifold.
10. The method for treating a wound of claim 9 , wherein the step of providing positive pressure to the Coanda device comprises intermittently providing positive pressure to the Coanda device.
11. The method for treating a wound of claim 9 , wherein the step of providing positive pressure to the Coanda device comprises providing positive pressure to the Coanda device when a saturation sensor indicates that the treatment manifold is saturated.
12. The method for treating a wound of claim 9 , wherein the Coanda device is configured to pull fluid from the Coanda opening thereby pulling fluid from the at least one port through the air-movement manifold and out the Coanda opening.
13. The method for treating a wound of claim 9 , wherein the Coanda device is configured to push fluid into the Coanda opening thereby pushing fluid from the Coanda opening through the air-movement manifold and out the at least one port.
14. The method for treating a wound of claim 12 , wherein a volume V 1 of air is delivered to the Coanda device over a time T and wherein a volume V 2 of air is delivered through the central opening of the Coanda device over time T whereby an enhanced volume of air is developed (V 2 +V 1 ).
15. The method for treating of claim 13 , wherein a volume V 1 of air is delivered to the Coanda device over a time T and wherein a volume V 2 of air is delivered through the central opening of the Coanda device over time T whereby an enhanced volume of air is developed (V 2 +V 1 ).
16. The method of claim 9 , wherein the step of providing a positive pressure comprises providing a high pressure to the Coanda device and wherein a low pressure flow is created through the central opening.