Negative pressure wound therapy apparatus
First Claim
Patent Images
1. A pump assembly apparatus for applying negative pressure to a wound, comprising:
- a magnetic circuit comprising;
an upper pole;
a lower pole spaced apart from the upper pole; and
a magnet positioned between at least a portion of the upper pole and the lower pole;
an electrically conductive voice coil, at least a portion of which is disposed between the upper pole and the lower pole, the electrically conductive voice coil being configured to move within at least a portion of the magnetic circuit;
a wound dressing configured to sealingly surround a wound;
a diaphragm; and
one or more valves configured to control a flow of fluid through the pump assembly;
wherein;
the voice coil is configured to move the diaphragm to pump a fluid through the pump assembly in response to a drive signal applied to the voice coil.
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Abstract
Some embodiments disclosed herein are directed to a pump assembly comprising a voice coil, a magnet and a diaphragm, wherein the voice coil is configured to move the diaphragm to pump a fluid through the pump assembly in response to a drive signal applied to the voice coil. Some embodiments disclosed herein are directed to an apparatus for applying negative pressure to a wound comprising a source of negative pressure configured to be coupled to a dressing, the source of negative comprising a voice coil actuator and a diaphragm, and a controller configured to produce a drive signal for the voice coil actuator.
577 Citations
30 Claims
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1. A pump assembly apparatus for applying negative pressure to a wound, comprising:
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a magnetic circuit comprising; an upper pole; a lower pole spaced apart from the upper pole; and a magnet positioned between at least a portion of the upper pole and the lower pole; an electrically conductive voice coil, at least a portion of which is disposed between the upper pole and the lower pole, the electrically conductive voice coil being configured to move within at least a portion of the magnetic circuit; a wound dressing configured to sealingly surround a wound; a diaphragm; and one or more valves configured to control a flow of fluid through the pump assembly; wherein; the voice coil is configured to move the diaphragm to pump a fluid through the pump assembly in response to a drive signal applied to the voice coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21)
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15. The apparatus of 28, wherein:
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the filter is further configured to filter the first pulse-width modulation drive signal to produce a first sinusoidal wave and filter the second pulse-width modulation drive signal to produce a second sinusoidal wave; and the controller is further configured to combine the first and second sinusoidal waves to produce the sinusoidal drive signal. - View Dependent Claims (16)
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22. An apparatus for applying negative pressure to a wound, comprising:
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a source of negative pressure configured to be coupled to a dressing, the source of negative comprising a voice coil actuator and a diaphragm, wherein the voice coil actuator comprises; a magnetic circuit comprising an upper pole, a lower pole spaced apart from the upper pole, and a magnet positioned between at least a portion of the upper pole and the lower pole; a voice coil, at least a portion of which is positioned between the upper pole and the lower pole; and a controller configured to produce a drive signal for the voice coil actuator. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification