IP Library › Granted Patent US 12,629,466
Granted Patent B2
US 12,629,466 · App. 18/141,959 · Granted May 19, 2026

Negative pressure wound therapy apparatus and methods

Inventors: Ben Alan Askem (Leeds, GB); Iacopo Claudio Ferrari (Milan, IT); Matteo Foini (Milan, IT); Paolo Forzani (Milan, IT); Christopher John Fryer (York, GB); Allan Kenneth Frazer Grugeon Hunt (Beverley, GB); Christian Riva (Milan, IT)
Assignee: Smith & Nephew PLC
A61M1/96A61M1/73A61M1/732A61M1/74A61M1/743A61M1/82A61M1/86A61M1/962A61M1/982B29C65/1635B29C65/1677B29C65/7802B29C65/7805B29C66/54B29C66/7392F04B43/04F04B45/047F04B49/065F04B49/12F04B51/00A61M2205/0272A61M2205/15A61M2205/18A61M2205/3331A61M2205/42A61M2205/50A61M2205/505A61M2205/52A61M2205/581A61M2205/583A61M2205/584A61M2205/587A61M2205/70A61M2205/7536A61M2205/8206A61M2207/00B29C65/7808B29C66/71B29C66/8227B29C66/8242B29L2031/7496B29L2031/753
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Quick Facts
Patent No.
US 12,629,466
App. No.
18/141,959
Granted
May 19, 2026
Kind
B2
Abstract

Systems and methods for controlling a pump system for use in negative pressure wound therapy are described herein. In some embodiments, a method for controlling a pump system includes causing provision of negative pressure, via a flow path, to a wound dressing configured to be positioned over a wound, the flow path configured to fluidically connect the pump system to the wound dressing, measuring a first pressure value in the flow path at a first time, measuring a second pressure value in the flow path at a second time, calculating a first rate of pressure change using the first and second pressure values, and in response to determining that the calculated first rate of pressure change satisfies a threshold rate of change, providing an indication that the wound dressing is full, wherein the method is performed under control of a controller of the pump system.

Claims (29)

1 . A pump system configured for negative pressure wound therapy, the pump system comprising:

a negative pressure source configured to be fluidically connected via a fluid flow path to a wound dressing placed over a wound;

a pressure sensor configured to measure pressure in the fluid flow path; and

a controller configured to control operation of the negative pressure source, the controller further configured to:

apply a drive signal to the negative pressure source;

determine a plurality of time intervals during which the drive signal is at a sampling amplitude selected for determining pressure in the fluid flow path; and

during application of the drive signal to the negative pressure source, sample a plurality of pressures measured by the pressure sensor during the plurality of time intervals and not during other time intervals.

2 . The pump system of claim 1 , wherein the drive signal alternates between a positive value and a negative value and includes an offset.

3 . The pump system of claim 1 , wherein the sampling amplitude comprises a local maxima of the drive signal.

4 . The pump system of claim 1 , wherein the sampling amplitude comprises a local minima of the drive signal.

5 . The pump system of claim 1 , wherein the sampling amplitude comprises a zero crossing of the drive signal.

6 . The pump system of claim 1 , wherein the sampling amplitude comprises an offset crossing of the drive signal.

7 . The pump system of claim 1 , wherein the controller is further configured to sample pressure at least twice during a time interval of the plurality of time intervals.

8 . The pump system of claim 7 , wherein the controller is further configured to average the sampled plurality of pressures.

9 . The pump system of claim 1 , wherein the controller is further configured to adjust at least one parameter of the drive signal based on the sampled plurality of pressures.

10 . A kit comprising the pump system of claim 1 and the wound dressing.

11 . A method for controlling a pump system configured for negative pressure wound therapy, the method comprising:

applying a drive signal to a negative pressure source of the pump system configured to be fluidically connected via a fluid flow path to a wound dressing placed over a wound;

determining a plurality of time intervals during which the drive signal is at a sampling amplitude selected for determining pressure in the fluid flow path; and

while the drive signal is being applied to the negative pressure source, sampling a plurality of pressures measured within the fluid flow path during the plurality of time intervals and not during other time intervals,

wherein the method is performed under control of a controller of the pump system.

12 . The method of claim 11 , wherein the drive signal alternates between a positive value and a negative value and includes an offset.

13 . The method of claim 11 , wherein the sampling amplitude comprises a local maxima of the drive signal.

14 . The method of claim 11 , wherein the sampling amplitude comprises a local minima of the drive signal.

15 . The method of claim 11 , wherein the sampling amplitude comprises a zero crossing of the drive signal.

16 . The method of claim 11 , wherein the sampling amplitude comprises an offset crossing of the drive signal.

17 . The method of claim 11 , further comprising sampling pressure at least twice during a time interval of the plurality of time intervals.

18 . The method of claim 17 , further comprising averaging the sampled plurality of pressures.

19 . The method of claim 11 , further comprising adjusting at least one parameter of the drive signal based on the sampled plurality of pressures.

Continuity (4)
Continuation 16900413 · Jun 12, 2020
Continuation 15536260
Provisional Application 62095721 · Dec 22, 2014
Related Publication 20230355861A1 · Nov 9, 2023
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