Smith & Nephew, Inc. (Memphis, TN)

Embodiments of wound therapy using negative pressure systems as well as methods of operating them are disclosed. In certain embodiments, a system includes a pump assembly, canister, and a wound dressing designed to be positioned over a wound. The pump assembly, the canister, and the wound dressing are fluidly connected to facilitate application of negative pressure to wounds. The system can additionally include a valve configured to control the flow of positive pressure into the wound.

The embodiments described in the present disclosure relate to methods and apparatuses for dressing or treating a wound using negative or reduced pressure therapy or topical negative pressure (TNP) therapy. The embodiments described herein comprise devices for negative pressure therapy, strategies to regulate TNP system operation, and methods to use TNP systems.

In some embodiments an apparatus to apply negative pressure to a wound is described. The apparatus may include the source of negative pressure, a valve, or a controller. A flow path may facilitate fluid connection to the source of negative pressure. This allows a dressing to be placed over the wound. Negative pressure may be supplied through the wound dressing. The valve may control the supply of positive pressure via the wound dressing’s flow path. The controller is able to operate the source of negative pressur to deliver negative pressure through the wound dressing. It also produces the control signal based on at least the pressure difference. This signal can be used to regulate the valve to provide positive pressure to the wound dressing.

The apparatus of the preceding paragraph may comprise one or more of the following characteristics: The controller can operate the valve to apply positive pressure whenever the controller provides periodic negative pressure wound therapy to the wound.The control signal can be the pulse-width modulation (PWM) signal and the controller is able to vary a duty cycle of the PWM signal in order to control the valve to provide positive pressure via the flow route to the wound dressing. The controller can generate the controlsignal using a proportional-integral-derivative (PID) calculation, and an error of the PID calculation can be the pressure difference. A controller can determine that the accumulated error in PID is negative and set an integral term of the calculation to be zero and the total errors to be 0. If there is a negative determination the controller is also able to make a first decision. The controller can: at a first time decide that the error is positive and set the accumulated error of the PID calculation to be greater than a sum of the total error and the error, in response to a determination that the error is positive. The valve can be positioned before an exhaust for the reason of the negative pressure. The solenoid valve is feasible.

It is also disclosed an operation method or method of manufacturing the apparatus described in the previous two paragraphs.

In certain examples, a method of applying negative pressure therapy to a wound is disclosed. The method may include: providing negative pressure via an artery that flows to the dressing for a wound that is applied to an open wound; determining the pressure difference between the pressure of the wound dressing and a pressure setting creating a control signal in response to at least the pressure difference and then, using the control signal to operate the valve to deliver positive pressure through the flow route to the dressing until the pressure of the dressing of the wound is at the desired pressure.

A number of features are possible to include in the above-described method If the wound treatment is intermittently negative pressure is used to treat the wound, the valve may be operated to deliver positive pressure. Thecontrol signal can be a pulse-width modification (PWM) signal, and the operating the valve to provide positive pressure may be accomplished by varying a duty cycle of the PWM signal. The generating the control signal can include generating the control signalusing a proportional-integral-derivative (PID) calculation, and an error of the PID calculation can be the pressure difference. A solenoid valve is also possible.

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