Electro-mechanical pump for negative-pressure treatment
An apparatus for negative-pressure treatment may include an enclosure having a variable volume, a port and an actuation surface, a first one-way valve configured to allow fluid ingress to the enclosure, a second one-way valve configured to allow fluid egress from the enclosure, and an actuator configured to apply a linear force to the actuation surface.
1. An apparatus for negative-pressure treatment, the apparatus comprising:
an enclosure having a variable volume, a port and an actuation surface;
a first one-way valve coupled to the port and configured to allow fluid ingress to the enclosure through the port;
a second one-way valve coupled to the port and configured to allow fluid egress from the enclosure through the port; and
an actuator configured to apply a linear force to the actuation surface, the actuator comprising a linearly driven shaft and contact surface;
wherein the variable volume is configured to expand to generate a negative pressure in a range of about 115 mmHg to about 135 mmHg in response to the linear force being removed from the actuation surface.
2. The apparatus of claim 1 , further comprising a vented container fluidly coupled to the second one-way valve.
3. The apparatus of claim 1 , further comprising an actuator driver coupled to the actuator.
4. The apparatus of claim 1 , further comprising:
an actuator driver coupled to the actuator; and
a circuit board configured to periodically operate the actuator driver to apply the linear force to the actuation surface through the actuator.
5. The apparatus of claim 3 , wherein the actuator driver comprises an electric motor.
6. The apparatus of claim 5 , wherein the electric motor is a gear motor.
7. The apparatus of claim 5 , further comprising a battery electrically coupled to the electric motor.
8. The apparatus of claim 7 , wherein the circuit board is further configured to receive a voltage feedback signal from the electric motor.
9. The apparatus of claim 3 , wherein the actuator driver comprises a solenoid valve.
10. The apparatus of claim 1 , further comprising a dressing fluidly coupled to the first one-way valve.
11. The apparatus of claim 1 , wherein the actuator is detachably coupled to the actuation surface.
12. The apparatus of claim 1 , wherein the actuator is fluidly isolated from the variable volume.
13. The apparatus of claim 4 , wherein the circuit board is fluidly isolated from the variable volume.
14. The apparatus of claim 1 , wherein the enclosure comprises flexible sides.
15. The apparatus of claim 1 , wherein the enclosure comprises concertinaed sides.
16. The apparatus of claim 1 , wherein the enclosure is a bellows.
17. An apparatus for negative-pressure treatment, the apparatus comprising:
a dressing;
an enclosure having a variable volume and a port;
a container fluidly coupled to the dressing through the enclosure;
a first one-way valve coupled to the port and configured to allow fluid ingress to the enclosure from the dressing through the port;
a second one-way valve coupled to the port and configured to allow fluid egress from the enclosure to the container through the port; and
an actuator comprising a shaft and contact surface, the shaft and contact surface configured to be driven linearly to apply a linear force to the enclosure;
wherein the variable volume is configured expand to generate a negative pressure in a range of about 115 mmHg to about 135 mmHg in response to the linear force being removed from the enclosure.
18. The apparatus of claim 17 , wherein the actuator configured to be decoupled from the enclosure.
19. The apparatus of claim 17 , wherein the enclosure is configured to maintain a therapeutic negative pressure in the dressing.
20. The apparatus of claim 19 , wherein the therapeutic negative pressure is in a range of about 115 mmHg to about 135 mmHg.
21. The apparatus of claim 17 , wherein the actuator is an electro-mechanical actuator and is fluidly isolated from the variable volume.
22. The apparatus of claim 17 , wherein the enclosure comprises flexible sides.
23. The apparatus of claim 17 , wherein the enclosure comprises concertinaed sides.
24. The apparatus of claim 17 , wherein the enclosure is a bellows.
25. A method of providing negative-pressure treatment to a tissue site, the method comprising:
placing a tissue interface proximate to the tissue site;
placing a cover over the tissue interface;
sealing the cover to an attachment surface peripheral to the tissue site;
fluidly coupling the tissue interface to an enclosure having a variable volume through a port;
fluidly coupling a container to the tissue interface through the enclosure via the port;
detachably coupling the enclosure to an actuator, the actuator comprising a shaft and contact surface;
extending the shaft and contact surface of the actuator linearly to apply a linear force on the enclosure to compress the variable volume and expel fluid from the enclosure through the port; and
retracting the shaft and contact surface of the actuator linearly to remove the linear force from the enclosure to allow the variable volume to expand and draw fluid from the tissue site into the enclosure via the port;
wherein the expansion of the variable volume generates negative pressure in a range of about 115 mmHg to about 135 mmHg.
26. The method of claim 25 , wherein the actuator is fluidly isolated from the variable volume.
27. The method of claim 25 , wherein the enclosure comprises flexible sides.
28. The method of claim 25 , wherein the enclosure is a bellows.
29. The method of claim 25 , wherein compressing the variable volume expels fluid through a one-way valve to the container.
30. The method of claim 25 , further comprising decoupling the enclosure from the actuator.