INTERFACES, SYSTEMS, AND METHODS FOR USE IN REDUCED PRESSURE TISSUE TREATMENT

• US 20140039424A1
• Filed: 07/31/2013
• Published: 02/06/2014
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: KCI Licensing Incorporated (3M Company)
• Original Assignee: KCI Licensing Incorporated (3M Company)
• Inventors: Locke, Christopher Brian
• Granted Patent: US 9,623,159 B2
• Time in Patent Office: Days
• US Class Current: 604/319
• CPC Class Codes: A61M 1/804 using Laval or Venturi jet pumps
• CPC Class Codes: A61M 1/912 Connectors between dressing and drainage tube
• CPC Class Codes: A61M 1/96 Suction control thereof
• CPC Class Codes: A61M 1/964 having venting means on or near the dressing
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/3337 Controlling, regulating pressure or flow by means of a valve by-passing a pump
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3358 Measuring barometric pressure, e.g. for compensation
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
• CPC Class Codes: A61M 27/00 Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202

Abstract

Systems and devices for treating a tissue site may include an interface adapted to provide a reduced pressure to a dressing. The interface may include a positive-pressure channel for delivering a positive pressure from a positive-pressure port to a positive pressure outlet. The positive-pressure channel may include a constricted portion configured to provide a pressure drop. The interface may additionally include a reduced-pressure channel adapted to deliver reduced pressure to the dressing that substantially corresponds to the pressure drop. The reduced-pressure channel may be fluidly coupled between the positive pressure channel and a side of the interface body adapted to face the dressing. Other systems and devices are disclosed.

Claims

1. An interface for providing a reduced pressure to a dressing, the interface comprising:

an interface body having a first side and a second side, the second side adapted to face the dressing;

an inlet formed proximate the first side of the interface body, the inlet having a positive-pressure port and a pressure-sensing port;

a positive-pressure channel adapted to deliver positive pressure and extending through the interface body from the positive-pressure port to a positive-pressure outlet proximate the first side of the interface body, wherein the positive-pressure channel includes a constricted portion configured to provide a pressure drop;

a reduced-pressure channel adapted to deliver the reduced pressure to the dressing, the reduced-pressure channel fluidly coupled between the positive-pressure channel and the second side of the interface body, wherein the reduced pressure substantially corresponds to the pressure drop; and

a pressure-sensing channel in fluid communication between the pressure-sensing port and the second side of the interface body.

2. The interface of claim 1, wherein the reduced-pressure channel has a longitudinal dimension extending between the positive-pressure channel and the second side of the interface body that is greater than 15 millimeters.

3. The interface of claim 1, wherein the positive-pressure channel has a longitudinal axis substantially parallel to the second side of the interface body, and wherein the reduced-pressure channel is substantially perpendicular to the positive-pressure channel.

4. The interface of claim 1, further comprising a hydrophobic filter positioned adjacent the second side of the interface body and adapted to be positioned in fluid communication between the reduced-pressure channel and the dressing.

5. The interface of claim 1, further comprising a regulating valve associated with the reduced pressure channel that is adapted to regulate an amount of the reduced pressure being delivered to the dressing.

6. The interface of claim 1, further comprising at least one duct in fluid communication with the positive-pressure outlet, wherein the at least one duct is configured to direct flow over a drape.

7. The interface of claim 1, wherein the constricted portion has a first diameter at an upstream end and a second diameter at an opposing downstream end, the second diameter being smaller than the first diameter, and wherein the constricted portion has a slope of 30 degrees relative to a longitudinal axis of the positive-pressure channel.

8. The interface of claim 1, wherein the positive-pressure outlet is configured to vent to the atmosphere.

9. The interface of claim 1, wherein the reduced-pressure channel is fluidly coupled to the positive-pressure channel downstream of the constricted portion and between the constricted portion and the positive-pressure outlet.

10. The interface of claim 1, wherein the reduced-pressure channel is fluidly coupled to the positive-pressure channel at the constricted portion.

11. The interface of claim 1, further comprising:

a hydrophobic filter disposed proximate the second side of the interface body;

a regulating valve associated with the reduced-pressure channel that is adapted to regulate an amount of the reduced pressure being delivered to the dressing;

at least one duct associated with the positive-pressure outlet and configured to direct flow over a drape;

wherein the reduced-pressure channel has a longitudinal dimension extending between the positive-pressure channel and the second side of the interface body that is greater than 15 millimeters;

wherein the positive-pressure channel has a longitudinal axis substantially parallel to the second side of the interface body, and wherein the reduced-pressure channel is substantially perpendicular to the positive-pressure channel;

wherein the constricted portion has a slope greater than 20 degrees relative to a longitudinal axis of the positive-pressure channel;

wherein the positive-pressure outlet is configured to vent to atmosphere; and

wherein the positive-pressure port is fluidly isolated from the pressure-sensing port proximate the inlet.

12. A system for treating a tissue site with reduced pressure, comprising:

a manifold for placing proximate the tissue site, the manifold comprising an absorbent layer for absorbing liquids from the tissue site;

a flexible film drape for covering the manifold to form a sealed space containing the manifold, the flexible film drape having an aperture adapted to provide fluid communication with the sealed space;

an interface adapted to be positioned over the flexible film drape;

wherein the interface comprises;

an interface body having a first side and a second side, the second side adapted to face the flexible film drape and to be in fluid communication with the manifold through the aperture,

an inlet formed proximate the first side of the interface body, the inlet having a positive-pressure port and a pressure-sensing port, wherein the positive-pressure port is fluidly isolated from the pressure-sensing port proximate the inlet,

a positive-pressure channel adapted to deliver positive pressure and extending through the interface body from the positive-pressure port to a positive pressure outlet proximate the first side of the interface body, wherein the positive-pressure channel includes a constricted portion configured to provide a pressure drop,

a reduced-pressure channel adapted to deliver a reduced pressure to the manifold, the reduced-pressure channel fluidly coupled between the positive-pressure channel and the second side of the interface body, wherein the reduced pressure substantially corresponds to the pressure drop, and

a pressure-sensing channel in fluid communication between the pressure-sensing port and the second side of the interface body;

a positive-pressure source fluidly coupled to the positive-pressure channel; and

a pressure-sensing unit fluidly coupled to the pressure-sensing channel for measuring a pressure in the pressure-sensing channel.

13. The system of claim 12, further comprising at least one duct fluidly coupled to the positive-pressure outlet for directing positive flow over the flexible film drape.

14. The system of claim 13, wherein the at least one duct comprises a Coanda device adapted to entrain air and to increase a volume of the positive flow.

15. The system of claim 12, further comprising a controller coupled to the positive-pressure source for regulating an amount of the positive pressure delivered to the positive-pressure port.

16. The system of claim 12, wherein the reduced-pressure channel has a longitudinal dimension extending between the positive-pressure channel and the second side of the interface body that is greater than 15 millimeters.

17. The system of claim 12, wherein the positive-pressure channel has a longitudinal axis that is substantially parallel to the second side of the interface body, and wherein the reduced-pressure channel is substantially perpendicular to the positive-pressure channel.

18. The system of claim 12, further comprising a hydrophobic filter positioned adjacent the second side of the interface body and adapted to be positioned in fluid communication between the reduced-pressure channel and the manifold.

19. The system of claim 12, further comprising a regulating valve associated with the reduced pressure channel that is adapted to regulate an amount of the reduced pressure being delivered to the tissue site.

20. The system of claim 12, wherein the constricted portion has a first diameter at an upstream end and a second diameter at an opposing downstream end, the second diameter being smaller than the first diameter, and wherein the at least one constricted portion has a slope of 30 degrees relative to a longitudinal axis of the positive-pressure channel.

21. The system of claim 12, wherein the positive-pressure outlet is configured to vent to the atmosphere.

22. The system of claim 12, wherein the reduced-pressure channel is fluidly coupled to the positive-pressure channel downstream of the at least one constricted portion and between the constricted portion and the positive-pressure outlet.

23. The system of claim 12, wherein the reduced-pressure channel is fluidly coupled to the positive-pressure channel at the at least one constricted portion.

24. A system for treating a tissue site with a reduced pressure, comprising:

a manifold for placing proximate the tissue site, the manifold having a first side and a second side, the second side of the manifold adapted to face the tissue site;

a flexible film drape for covering the first side of the manifold to form a sealed space containing the manifold, the flexible film drape having an aperture adapted to provide fluid communication with the sealed space;

an interface for positioning over the flexible film drape proximate the aperture, the interface having a first side and a second side, the second side of the interface adapted to face the tissue site, the interface comprising;

an inlet port positioned proximate the first side of the interface and adapted to intake ambient gas, the inlet port comprising a constricted portion having a first diameter at an upstream end and a second diameter at an opposing downstream end, wherein the second diameter is smaller than the first diameter, and wherein the constricted portion is adapted to provide a pressure drop,

a first reduced-pressure channel extending through the interface from the inlet port to an outlet port positioned proximate the first side of the interface,

a second reduced-pressure channel adapted to deliver the reduced pressure to the tissue site, the second reduced-pressure channel fluidly coupled between the first reduced-pressure channel and the second side of the interface, wherein the reduced pressure substantially corresponds to the pressure drop, and

a pressure-sensing port positioned in the second side of the interface;

a reduced-pressure source fluidly coupled to the outlet port; and

a pressure-sensing unit fluidly coupled to the pressure-sensing port for monitoring pressure proximate the tissue site.

25. The system of claim 24, further comprising a controller adapted to be coupled to the reduced-pressure source for regulating an amount of the reduced pressure delivered to the tissue site

26. The system of claim 24, wherein the second reduced-pressure channel has a longitudinal dimension extending between the first reduced-pressure channel and the second side of the interface that is greater than 15 millimeters.

27. The system of claim 24, wherein the first reduced-pressure channel has a longitudinal axis substantially parallel to the second side of the interface, and wherein the second reduced-pressure channel is substantially perpendicular to the first reduced-pressure channel.

28. The system of claim 24, further comprising a hydrophobic filter adapted to be positioned between the tissue site and the first reduced-pressure channel.

29. The system of claim 24, further comprising a regulating valve associated with the second reduced-pressure channel that is adapted to regulate an amount of the reduced pressure being delivered to the tissue site.

30. The system of claim 24, wherein the inlet port has a slope of 30 degrees relative to the longitudinal axis of the first reduced-pressure channel.

31. The system of claim 24, further comprising a canister for collecting exudate drawn from the tissue site.