Negative pressure wound treatment device, and methods
Inventors
Anderson, Paul J. • Duchon, Douglas
Assignees
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Publication Number
US-8025650-B2
Publication Date
2011-09-27
Expiration Date
Abstract
A negative pressure (i.e., vacuum or suction) wound healing device and system incorporating the device. The device of the present disclosure is smaller, lighter, portable, and overall more manageable by both the user and the medical personnel than the conventional systems. The device could be readily worn by the user.
Core Innovation
The invention provides a system and method for applying negative pressure on a wound. A device provides negative pressure on the wound via a first vacuum line to a wound sealably covered by dressing material, and an expandable spray-in foam is located within the wound below the dressing material and exposed to the negative pressure.
The expandable spray-in foam has an initial flowable state and a final set state in which the spray-in foam automatically substantially conforms to a shape of the wound. The system further positions the dressing material sealably covering the wound so that the negative pressure creates a vacuum under the dressing material.
The device is described as portable, with compactness constraints such as the device weighing no more than 3 lbs and a housing volume no more than about 125 in^3, and can include a housing having at least a flexible and expandable portion. The negative-pressure structure may include a pump configured to provide negative pressure, and a three-way check valve is included in connection with applying negative pressure.
The invention also describes collecting wound extrudate using a container connected to the device, with the container located outside of a housing that encloses the structure for providing negative pressure on the wound. Optional wound-monitoring features are described in the partial content, including telemetry sensors, pressure sensors, identification chips, and vacuum control algorithms.
Claims Coverage
The partial content includes four independent claims directed to systems for applying negative pressure with an expandable spray-in foam, and one independent claim directed to a method. Across these independent claims, the main inventive theme is combining a portable negative-pressure vacuum line and sealable dressing with an expandable spray-in foam that transitions from an initial flowable state to a final set state that automatically substantially conforms to the wound shape, with additional refinements for device compactness, housing flexibility, pump types, a three-way check valve, and an extrudate storage container.
Portable negative pressure system with spray-in foam conformity
A device provides negative pressure on the wound via a first vacuum line, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure, having an initial flowable state and a final set state where the spray-in foam automatically substantially conforms to a shape of the wound.
Negative pressure system with compact housing volume limit
A device provides negative pressure on the wound via a first vacuum line, wherein a housing of the device has a volume of no more than about 125 in^3, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure and transitions from an initial flowable state to a final set state that automatically substantially conforms to a shape of the wound.
Negative pressure system with flexible and expandable device housing
A device provides negative pressure on the wound via a first vacuum line, wherein the device includes a housing having at least a flexible and expandable portion, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure and transitions from an initial flowable state to a final set state that automatically substantially conforms to a shape of the wound.
Negative pressure system with peristaltic pump and spray-in foam conformity
A device provides negative pressure on the wound via a first vacuum line, wherein the structure within the device configured to provide negative pressure on the wound includes a peristaltic pump, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure and transitions from an initial flowable state to a final set state that automatically substantially conforms to a shape of the wound.
Negative pressure system with syringe pump
A device provides negative pressure on the wound via a first vacuum line, wherein the structure within the device configured to provide negative pressure on the wound includes a syringe pump, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure and transitions from an initial flowable state to a final set state that automatically substantially conforms to a shape of the wound.
Negative pressure system with external extrudate container
A device provides negative pressure on the wound via a first vacuum line, the dressing material sealably covers the wound with the first vacuum line extending between the device and the dressing material, and an expandable spray-in foam located within the wound below the dressing material is exposed to the negative pressure and transitions from an initial flowable state to a final set state that automatically substantially conforms to a shape of the wound; and a container connected to the device for storing extrudate obtained by the applied pressure on the wound, wherein the container is located outside of a housing of the device, and the housing encloses the structure for providing negative pressure on the wound.
Method of applying negative pressure using spray-in foam and body-mounted pump
Spraying expandable foam on the wound wherein the foam has an initial flowable state and a final set state where the foam automatically substantially conforms to a shape of the wound, sealably covering the wound and the foam with a dressing material, and applying negative pressure on the wound to create a vacuum under the dressing material, wherein the negative pressure is applied by a pump portably mounted on a person's body, and wherein the pump includes a three-way check valve.
Across the independent claims in the provided partial content, the claim coverage centers on combining negative pressure delivered via a first vacuum line and sealable dressing with an expandable spray-in foam that sets to substantially conform to the wound shape. Additional independent coverage limits device compactness, specifies housing flexibility, includes particular pump types, and adds an extrudate storage container outside the device housing. One independent claim further includes body-mounted vacuum application with a three-way check valve.
Stated Advantages
Easier use and improved comfort associated with portability of the negative-pressure wound therapy system.
Reduced odor.
Faster and less tedious dressing changes.
Smaller, lighter, more manageable, and wearable on the user’s body than conventional vacuum systems.
Documented Applications
Applying negative pressure on a wound using a portable negative-pressure wound therapy system with an expandable spray-in foam that conforms to wound shape.
Applying negative pressure on an open wound by spraying expandable foam, sealing the wound and foam with dressing material, and creating a vacuum under the dressing using a body-mounted pump with a three-way check valve.
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