Granted Patent B2

US 12,564,670 · App. 17/870,458 · Granted Mar 3, 2026

Inventors: Richard Scott Weston (Encinitas, CA); Edward Yerbury Hartwell (Hull, GB)

Assignees: Smith & Nephew, Inc.; Smith & Nephew PLC

A61M1/96A61M1/732A61M1/74A61M1/75A61M1/90A61M27/00A61M1/95A61M1/966A61M2205/18A61M2230/00A61M2230/005A61M2230/04A61M2230/205A61M2230/50

Abstract

Claims (37)

1 . A negative pressure wound treatment system comprising:

a wound dressing configured to be positioned over and enclose a wound, the wound dressing configured to maintain reduced pressure under the wound dressing;

a vacuum pump configured to apply reduced pressure to the wound;

a controller configured to control application of reduced pressure to the wound;

wherein:

the controller is configured to cycle the reduced pressure applied to the wound between two different nonzero negative pressure values; and

the controller is further configured to adjust a magnitude of the two different nonzero negative pressure values and frequency that the two different nonzero negative pressure values are cycled between according to at least one physiological parameter; and

a sensor configured to detect at least one of the at least one physiological parameter.

2 . The system of claim 1 , wherein the sensor is positioned at or adjacent to the wound.

3 . The system of claim 1 , wherein the sensor is in wireless communication with the controller.

4 . The system of claim 1 , wherein the sensor is configured to detect a cardiac cycle, and wherein the controller is configured to adjust the frequency of the reduced pressure applied to the wound based on the detected cardiac cycle.

5 . The system of claim 4 , wherein the controller is configured to apply a first reduced pressure during a systolic period and a second reduced pressure during a diastolic period, wherein the magnitude of the second reduced pressure is greater than the magnitude of the first reduced pressure.

6 . The system of claim 5 , wherein the second reduced pressure is only applied for a portion of the diastolic period.

7 . The system of claim 5 , wherein a difference between the magnitude of the first reduced pressure and the magnitude of the second reduced pressure is at least 10 mmHg.

8 . The system of claim 4 , wherein the controller is configured to cyclically vary the reduced pressure at a frequency of about 50-120 cycles per minute.

9 . The system of claim 1 , wherein the sensor is configured to detect a blood flow rate.

10 . The system of claim 9 , wherein the sensor comprises an optical sensor.

11 . The system of claim 9 , wherein the sensor comprises an ultrasonic sensor.

12 . The system of claim 1 , wherein the sensor is configured to detect a temperature.

13 . A method of applying negative pressure to a wound, the method comprising:

applying reduced pressure from a vacuum pump to a wound dressing positioned over a wound;

monitoring at least one physiological parameter using a sensor; and

adjusting the reduced pressure from the vacuum pump using a controller by cycling the reduced pressure applied to the wound between at least a nonzero first reduced pressure and a nonzero second reduced pressure;

wherein;

a magnitude of the nonzero first reduced pressure and a magnitude of the nonzero second reduced pressure are adjusted according to the at least one physiological parameter;

a frequency that the nonzero first reduced pressure and the nonzero second reduced pressure are cycled between are adjusted according to the at least one physiological parameter; and

the magnitude of the nonzero second reduced pressure is different than the magnitude of the nonzero first reduced pressure.

14 . The method of claim 13 , further comprising communicating a signal from the sensor to the controller and adjusting the reduced pressure using the controller in response to the signal.

15 . The method of claim 13 , further comprising recording data detected by the sensor.

16 . The method of claim 13 , wherein the at least one physiological parameter comprises a cardiac cycle.

17 . The method of claim 16 , comprising applying reduced pressure to the wound at the first reduced pressure during a systolic period and applying reduced pressure to the wound at the second reduced pressure during a diastolic period, wherein the magnitude of the second reduced pressure is greater than magnitude of the first reduced pressure.

18 . The method of claim 13 , wherein a difference between the magnitude of the first reduced pressure and magnitude of the second reduced pressure is at least 10 mmHg.

19 . The method of claim 13 , wherein the at least one physiological parameter is monitored at or adjacent to the wound.

20 . The method of claim 13 , wherein the at least one physiological parameter comprises a blood flow rate.

21 . The method of claim 13 , comprising cycling the reduced pressure applied to the wound in a sinusoidal pattern between at least the first reduced pressure and the second reduced pressure.

22 . The system of claim 1 , wherein the at least one physiological parameter comprises a first physiological parameter and a second physiological parameter different than the first physiological parameter, wherein the magnitude of the two different nonzero negative pressure values is based on the first physiological parameter and the frequency that the two different nonzero negative pressure values are cycled between is according to the second physiological parameter.

23 . The method of claim 13 , wherein the at least one physiological parameter comprises a first physiological parameter and a second physiological parameter different than the first physiological parameter, wherein the magnitude of the nonzero first reduced pressure and the nonzero second reduced pressure are based on the first physiological parameter and the frequency that the nonzero first reduced pressure and the nonzero second reduced pressure are cycled between is according to the second physiological parameter.

Continuity (7)

References Cited (400)