Interfaces, systems, and methods for use in reduced pressure tissue treatment

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.

We claim: 
     
         1 . An interface for treating a tissue site, comprising:
 a first side and a second side, the second side of the interface adapted to face the tissue site;   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; and   a second reduced-pressure channel adapted to deliver a 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.   
     
     
         2 . The interface of  claim 1 , further comprising a pressure-sensing port positioned in the second side of the interface. 
     
     
         3 . The interface of  claim 1 , 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. 
     
     
         4 . The interface of  claim 1 , 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. 
     
     
         5 . The interface of  claim 1 , further comprising a hydrophobic filter adapted to be positioned between the tissue site and the first reduced-pressure channel. 
     
     
         6 . The interface of  claim 1 , 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. 
     
     
         7 . The interface of  claim 1 , wherein the inlet port has a slope of 30 degrees relative to a longitudinal axis of the first reduced-pressure channel.