Control circuit and method for negative pressure wound treatment apparatus
First Claim
1. A negative pressure wound therapy apparatus comprising:
- a negative pressure source configured to aspirate fluid from a wound via a fluid flow path using an actuator; and
a control circuit configured to;
cause the actuator to operate at a duty cycle below 100% for a pre-determined duration of time at power up of the negative pressure source; and
in response to expiration of the pre-determined duration of time, cause the actuator to operate at the duty cycle of substantially 100%.
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Accused Products
Abstract
A negative pressure wound therapy apparatus can include a wound dressing, a fluid collection container, a vacuum pump comprising a pump motor, and tubing. Additionally, the apparatus can include a pressure sensor that measures a pressure in the tubing. One or more tubes can channel a fluid between the wound dressing, the fluid collection canister, and the pump. In addition, first and second control circuits can be provided for controlling the pump motor without using a processor. The first control circuit can generate a difference signal between a desired pressure input and a pressure sensor input, and can further generate a motor control signal responsive to the difference signal. Moreover, a second control circuit can provide an override signal based at least in part on the difference signal and at least one reference signal. The override signal beneficially overrides the motor control signal to prevent the pump motor from stalling.
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Citations
25 Claims
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1. A negative pressure wound therapy apparatus comprising:
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a negative pressure source configured to aspirate fluid from a wound via a fluid flow path using an actuator; and a control circuit configured to; cause the actuator to operate at a duty cycle below 100% for a pre-determined duration of time at power up of the negative pressure source; and in response to expiration of the pre-determined duration of time, cause the actuator to operate at the duty cycle of substantially 100%. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of providing negative pressure wound therapy comprising:
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at power up of a negative pressure source configured to aspirate fluid from a wound via a fluid flow path, causing the negative pressure source to operate at a duty cycle below 100% for a pre-determined duration of time, in response to expiration of the pre-determined duration of time, causing the negative pressure source to operate at the duty cycle of substantially 100%, wherein the method is performed under control of a controller. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A negative pressure wound therapy apparatus comprising:
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a negative pressure source configured to aspirate fluid from a wound via a fluid flow path; a pressure sensor configured to measure pressure in the fluid flow path; and a controller configured to; determine a first difference between a negative pressure setting of the negative pressure source and a first pressure measured by the pressure sensor; determine a first control signal based on the first difference, the first control signal configured to operate the negative pressure source; and in response to determining that the first control signal would cause the negative pressure source to operate at a first duty cycle at power up of the negative pressure source; determine a second control signal configured to cause the negative pressure source to operate at a second duty cycle less than the first duty cycle; and operate the negative pressure source based on the second control signal. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of providing negative pressure wound therapy comprising:
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measuring a first pressure in a fluid flow path configured to provide negative pressure wound therapy using a negative pressure source; determining a first difference between a negative pressure setting of the negative pressure source and the first pressure; determining a first control signal based on the first difference, the first control signal configured to control the negative pressure source; in response to determining that the first control signal would cause the negative pressure source to operate at a first duty cycle at power up of the negative pressure source; determining a second control signal configured to cause the negative pressure source operate at a second duty cycle less than the first duty cycle; operating the negative pressure source based on the second control signal. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification