Negative pressure wound therapy apparatus and methods

Patent metadata

Field	Value
Publication number	US-2020121833-A9
Application number	US-201515536305-A
Country	US
Kind code	A9
Filing date	Dec 21, 2015
Priority date	Dec 22, 2014
Publication date	Apr 23, 2020
Grant date	—

Abstract

Systems and methods for controlling and/or calibrating a pump system for use in negative pressure wound therapy are described herein. In some embodiments, a method for controlling a pump system includes calculating an amplitude and an offset for a drive signal based at least in part on previously calculated parameters and a negative pressure setting, generating the drive signal, and applying the drive signal to a pump system. The pump system can be fludicially connected to a wound dressing positioned over a wound.

First claim

1 . A negative pressure pump system comprising:
a pump assembly comprising:
an actuator; and
a diaphragm; and
a controller configured to control operation of the pump system, the controller further configured to:
calculate at least one of an amplitude and an offset for a drive signal based at least in part on previously calculated parameters and a negative pressure setting;
generate the drive signal with the at least one calculated amplitude and offset; and
apply the drive signal to the pump system, thereby causing delivery of negative pressure wound therapy.

2 . The negative pressure pump system of claim 1 , wherein the previously calculated parameters comprise a plurality of calibrated amplitudes at a plurality of negative pressure settings.

3 . The negative pressure pump system of claim 1 , wherein the previously calculated parameters comprise a plurality of calibrated offsets at a plurality of negative pressure settings.

4 . The negative pressure pump system of claim 1 , wherein the controller is further configured to calculate both the amplitude and the offset for the drive signal.

5 . The negative pressure pump system of claim 1 , wherein the controller is further configured to interpolate between at least two previously calculated amplitudes or offsets.

6 . The negative pressure pump system of claim 5 , wherein the controller is further configured to linearly interpolate between at least two previously calculated amplitudes or offsets.

7 . The negative pressure pump system of claim 1 , wherein the previously calculated parameters comprises at least 3 parameters.

8 . The negative pressure pump system of claim 1 , wherein the previously calculated parameters are dependent on one or more properties of the pump system.

9 . The negative pressure pump system of claim 1 , wherein the actuator comprises a voice coil actuator, the voice coil actuator being connected to the diaphragm.

10 . The negative pressure pump system of claim 1 , wherein the pump assembly further comprises a spring configured to affect a resonant frequency of the pump assembly.

11 . The negative pressure pump system of claim 1 , wherein the controller is further configured to apply a start up signal when the pump system has been activated after a period of inactivity, the start up signal comprising at least one of an amplitude and an offset different from at least one of the amplitude and the offset of the drive signal.

12 . The negative pressure pump system according to claim 11 , wherein the controller is further configured to:
calculate at least one of an amplitude and an offset for the start up signal based at least in part on previously calculated parameters and a soft start negative pressure setting that is less than the negative pressure setting; and apply the start up signal to the pump system.

13 . The negative pressure pump system according to claim 12 , wherein the controller is further configured to apply the start up signal to the pump system over a start up time period until the soft start negative pressure setting is reached under a wound dressing configured to be placed over a wound, and subsequently apply the drive signal to the pump system.

14 . The negative pressure pump system according to claim 13 , wherein the controller is configured to apply the drive signal to the pump system until the negative pressure setting is reached under the wound dressing.

15 . The negative pressure pump system according to claim 13 , wherein the start up time period is approximately 100 milliseconds.

16 . The negative pressure pump system according to claim 13 , wherein the start up time period is between approximately 10 milliseconds and approximately 1000 milliseconds.

17 . The negative pressure pump system according to claim 13 , wherein the start up time period is between approximately 50 milliseconds and approximately 500 milliseconds.

18 . The negative pressure pump system according to claim 13 , wherein the start up time period is between approximately 75 milliseconds and approximately 250 milliseconds.

19 .- 57 . (canceled)

58 . A calibration system for calibrating a pump system configured for negative pressure wound therapy, the calibration system comprising:
a sensor; and a controller configured to control operation of the calibration system, the controller further configured to:
cause generation of a drive signal;
cause actuation of the pump system with the drive signal;
measure movement of a component of the pump system with the sensor;
calculate a first dimension based on the measured movement of the component; and
determine whether a first convergence condition has been satisfied by determining that the first dimension is within a first tolerance of a first target value.

59 . A method for controlling a pump system configured for negative pressure wound therapy, the method comprising:
calculating at least one of an amplitude and an offset for a drive signal based at least in part on previously calculated parameters and a negative pressure setting; generating the drive signal with the at least one calculated amplitude and offset; and applying the drive signal to the pump system, and thereby causing delivery of negative pressure wound therapy; wherein the method is performed under control of a controller of the pump system.

60 . A method for calibrating a pump system configured for negative pressure wound therapy, the method comprising:
causing generation of a drive signal; causing actuation of the pump system with the drive signal; measuring movement of a component of the pump system; calculating a first dimension based on the measured movement of the component; and determining whether a first convergence condition has been satisfied by determining that the first dimension is within a first tolerance of a first target value, wherein the method is performed under control of a controller of a calibration system.

Assignees

• Smith & Nephew

Inventors

• Askem Ben Alan
• Ferrari Iacopo Claudio
• Foini Matteo
• Forzani Paolo
• Fryer Christopher John
• Hunt Allan Kenneth Frazer Grugeon
• Riva Christian

Classifications

• F04B45/047

  Pumps having electric drive · CPC title

• B29C65/1677

  making use of an absorber or impact modifier · CPC title

• B29C65/1635

  at least passing through one of the parts to be joined, i.e. laser transmission welding · CPC title

• B29C66/8227

  using springs · CPC title

• B29C65/7808

  in the form of holes or slots (B29C65/7814 takes precedence; holding or clamping means cooperating with specially formed features of at least one of the parts to be joined B29C65/7844) · CPC title