Granted Patent B2

US 12,458,742 · App. 17/316,171 · Granted Nov 4, 2025

Inventors: Christopher Brian Locke (Bournemouth, GB); David Robson Blandford (Fordingbridge, GB); Richard Daniel John Coulthard (Verwood, GB)

Assignee: Solventum Intellectual Properties Company

A61M1/742A61M1/80A61M1/962A61M1/92

Abstract

Claims (37)

1 . A pump for delivering reduced pressure to a tissue site, comprising:

a motor for driving the pump; and

a controller operatively coupled to the motor;

wherein the controller is configured to:

operate a power-on boost procedure by providing a variable current and voltage to the motor for a predetermined time period;

provide a substantially constant current to the motor based on a target pressure, and

determine a supply pressure by determining whether a motor voltage corresponding to a voltage drop across the motor that varies with time is within a predetermined range of voltages, the predetermined range of voltages being based on the target pressure.

2 . The pump of claim 1 , wherein the controller is configured to stop providing current to the motor in response to the controller determining that the voltage at the motor is below the predetermined range of voltages.

3 . The pump of claim 1 , wherein the lower boundary of the predetermined range of voltages is a stall voltage of the motor.

4 . The pump of claim 3 , wherein the controller is configured to stop providing current to the motor in response to the controller determining that the voltage at the motor is below the stall voltage.

5 . The pump of claim 1 , wherein the controller is configured to stop providing current to the motor for a predetermined period of time in response to the controller determining that the voltage at the motor is below the predetermined range of voltages.

6 . The pump of claim 1 , wherein the upper boundary of the predetermined range of voltages is a leak voltage of the motor.

7 . The pump of claim 6 , wherein the controller is configured to generate a leak signal in response to the controller determining that the voltage at the motor is above the leak voltage.

8 . The pump of claim 7 , wherein the controller is configured to apply additional power to the motor for a predetermined period of time in response to the controller determining that the voltage at the motor is above the leak voltage.

9 . The pump of claim 8 , wherein the controller is configured to apply additional power to the motor for the predetermined period of time by increasing the current to the motor.

10 . The pump of claim 8 , wherein the controller is configured to apply additional power to the motor for the predetermined period of time by increasing the voltage at the motor.

11 . A method for delivering reduced pressure to a tissue site, comprising:

providing a variable current and voltage to a motor for a time period;

providing a substantially constant current to the motor based on a target pressure;

determining a supply pressure by determining whether a voltage at the motor that varies with time is within a predetermined range of voltages, the predetermined range of voltages being based on the target pressure; and

driving a pump with the motor, the pump configured to be fluidly coupled to the tissue site.

12 . The method of claim 11 , further comprising:

stopping the current provided to the motor in response to the voltage at the motor dropping below the predetermined range of voltages.

13 . The method of claim 11 , wherein the lower boundary of the predetermined range of voltages is a stall voltage of the motor.

14 . The method of claim 13 , further comprising:

stopping the current provided to the motor in response to the voltage at the motor dropping below the stall voltage.

15 . The method of claim 13 , further comprising:

stopping the current provided to the motor for a predetermined period of time in response to the voltage at the motor dropping below the predetermined range of voltages.

16 . The method of claim 11 , wherein the upper boundary of the predetermined range of voltages is a leak voltage of the motor.

17 . The method of claim 16 , further comprising:

generating a leak signal in response to the voltage at the motor rising above the leak voltage.

18 . The method of claim 17 , further comprising:

applying additional power to the motor for a predetermined period of time in response to the voltage at the motor rising above the leak voltage.

19 . The method of claim 17 , further comprising:

increasing the current provided to the motor in response to the voltage at the motor rising above the leak voltage.

20 . The method of claim 17 , further comprising:

increasing the voltage at the motor in response to the voltage at the motor rising above the leak voltage.

Assignments (3)

Continuity (5)

References Cited (198)