Sustained variable negative pressure wound treatment and method of controlling same

摘要

Disclosed herein are systems and methods for providing reduced or negative pressure, and more particularly cyclical reduced pressure, to treat a wound. The system can include a wound dressing, a fluid collection container, a suction source, filters, and conduits. In addition, the system can include a control device and sensors. The sensors may be configured to monitor certain physiological conditions of a patient such as temperature, pressure, blood flow, blood oxygen saturation, pulse, cardiac cycle, and the like. Application of cyclical reduced pressure between two or more values below atmospheric pressure may be synchronized with the physiological conditions monitored by the sensors. Certain embodiments of the system utilize an air reservoir and one or more valves and pressure sensors or gauges to allow for rapid cycling of the level of reduced pressure within the wound dressing between two or more reduced pressure values.

主权项

1. A method of treating a wound, the method comprising:
applying, via a fluid flow path, reduced pressure from a suction source to a wound dressing placed over the wound, the fluid flow path comprising a reservoir and first and second conduits, the first conduit fluidically connected to the suction source and the reservoir, and the second conduit fluidically connected to the reservoir and the wound dressing; while maintaining pressure under the wound dressing below atmospheric pressure, adjusting pressure under the wound dressing by:
removing gas from under the wound dressing and storing, via the first conduit, at least some of the removed gas in the reservoir thereby causing pressure under the wound dressing to reach a first magnitude of reduced pressure; andsupplying under the wound dressing, via the second conduit, at least some of the stored gas from the reservoir so that pressure under the wound dressing changes from the first magnitude of reduced pressure to a second magnitude of reduced pressure that is closer to atmospheric pressure than the first magnitude of reduced pressure; and using a valve of the reservoir to vent at least some of the stored gas from the reservoir to atmosphere through a filter so as to reduce pressure in the reservoir, wherein a difference in pressure between the first magnitude of reduced pressure and the second magnitude of reduced pressure is at least 10 mmHg.