Device including multilayer membrane to control fluid drainage and methods of use thereof

Patent metadata

Field	Value
Publication number	US-9956531-B2
Application number	US-201514593110-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Jan 9, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A device and methods are disclosed herein for fluid removal during wound treatment or for removal or dialysis of components from blood or tissue. A device is disclosed that includes a multilayer membrane including a plurality of layers; an electroactive polymer within each layer; and a controller operably connected to sequentially activate the electroactive polymer to alter one or more sizes of the plurality of the variably-sized pores within one or more layers of the multilayer membrane. A device is disclosed that includes a multilayer membrane including a plurality of layers; an actuator operably attached to the plurality of layers of the multilayer membrane; and a controller operably activating the actuator to alter a relative lateral position of the two or more layers of the multilayer membrane to align two or more of the plurality of pores within the plurality of layers of the multilayer membrane.

First claim

What is claimed is:

1. A device comprising:
a multilayer membrane including a plurality of layers, each layer of the plurality of layers having a plurality of variably-sized pores;
an electroactive polymer within the each layer and surrounding each of the plurality of variably-sized pores; and
a controller operably connected to sequentially activate the electroactive polymer to alter one or more sizes of the plurality of the variably-sized pores within a first layer of the multilayer membrane and to sequentially alter one or more sizes of the variably-sized pores sequentially within a second layer and one or more subsequent layers of the multilayer membrane;
wherein at least one of the plurality of the variably-sized pores in the first layer is aligned with at least one of the plurality of variably-sized pores in one or more subsequent layers of the multilayer membrane.

2. The device of claim 1 , wherein the controller sequentially activates the electroactive polymer to vary aperture of one or more of the plurality of the variably-sized pores and to vary accessibility to the one or more of the plurality of the variably-sized pores within the multilayer membrane.

3. The device of claim 1 , wherein the controller is responsive to a conditional stimulus.

4. The device of claim 3 , wherein the at least one of the plurality of the variably-sized pores in the first layer aligned with the at least one of the plurality of variably-sized pores in one or more subsequent layers of the multilayer membrane are accessible to fluid flow through a plurality of layers of the multilayer membrane in response to the conditional stimulus.

5. The device of claim 1 , wherein the controller is operably connected to activate the electroactive polymer in the plurality of layers of the multilayer membrane to produce peristaltic pumping activity by aligned variably-sized pores in three or more layers of the multilayer membrane.

6. The device of claim 1 , wherein the controller is operably connected to activate the electroactive polymer in to provide variable fluid flow rates by separately controlling the size of one or more aligned variably-sized pores of each layer of two or more layers of the multilayer membrane.

7. The device of claim 1 , wherein the controller is operably connected to activate the electroactive polymer to separately control movement of each layer of two or more layers to provide variable fluid flow rates.

8. The device of claim 1 , comprising a pump configured to apply pressure or suction to the multilayer membrane.

9. The device of claim 8 , wherein the controller is operably connected to alter the relative position of the two or more layers of the multilayered membranes to expose one or more of the plurality of variably-sized pores in each of the two or more layers to pressure or suction from the pump.

10. The device of claim 1 , comprising one or more nanoporous layers in the multilayer membrane, wherein the controller is operably connected to activate the electroactive polymer in the one or more nanoporous layers to provide controlled transport of fluid through the one or more nanoporous layers.

11. A method of varying a fluid flow rate through a multilayer membrane comprising:
sending a control signal from a controller operably connected to activate an electroactive polymer within each layer of a plurality of layers of a multilayer membrane, wherein the electroactive polymer surrounds each of a plurality of variably-sized pores in the plurality of layers of the multilayer membrane;
altering the electroactive polymer surrounding one or more sizes of the plurality of variably-sized pores within a first layer of the multilayer membrane and altering the one or more sizes of the variably-sized pores sequentially within a second layer and one or more subsequent layers of the multilayer membrane; and
aligning at least one of the plurality of the variably-sized pores in the first layer with at least one of the plurality of variably-sized pores in one or more subsequent layers of the multilayer membrane.

12. The method of claim 11 , comprising:
controlling accessibility to the one or more sizes of the plurality of the variably-sized pores within the multilayer membrane by altering the electroactive polymer in response to a conditional stimulus.

13. The method of claim 11 , comprising: receiving a conditional stimulus at the controller.

14. The method of claim 13 , comprising: aligning the at least one of the plurality of the variably-sized pores in the first layer with the at least one of the plurality of variably-sized pores in one or more subsequent layers of the multilayer membrane to provide access to fluid flow through a plurality of layers of the multilayer membrane in response to the conditional stimulus.

15. The method of claim 11 , comprising: sending a control signal from the controller operably connected to activate the electroactive polymer in the plurality of layers of the multilayer membrane to produce peristaltic pumping activity by aligned variably-sized pores in three or more layers of the multilayer membrane.

16. The method of claim 15 , comprising: sending a control signal from the controller operably connected to activate the electroactive polymer to alter the size of one or more aligned variably-sized pores sequentially for each layer of two or more layers of the multilayer membrane to generate pressure or suction through the multilayer membrane.

17. The method of claim 11 , comprising: sending a control signal from the controller operably connected to activate the electroactive polymer to provide variable fluid flow rates by separately controlling the size of one or more aligned variably-sized pores of each layer of two or more layers of the multilayer membrane.

18. The method of claim 11 , comprising: sending a control signal from the controller operably connected to activate the electroactive polymer to separately control movement of each layer of two or more layers to provide variable fluid flow rates.

19. The method of claim 11 , comprising:
applying pressure or suction to the multilayer membrane through a pump.

20. The method of claim 19 , comprising:
sending a control signal from the controller to alter the relative position of two or more layers of the multilayered membranes to expose the one or more of the plurality of variably-sized pores in each of the two or more layers to pressure or suction from the pump.

21. The method of claim 11 , comprising:
sending a control signal from the controller to control fluid flow through each layer of the plurality of layers of the multilayer membrane by altering the electroactive polymer to push fluid flow or pull fluid flow through the multilayer membrane.

22. The method of claim 11 , comprising:
sending a control signal from the controller to control fluid flow through each layer of the plurality of layers of the multilayer membrane by altering the electroactive polymer to provide pulsed transport to control entry rate and exit rate of fluid through the multilayered membrane.

23. The method of claim 11 , comprising:
sending a control signal from the controller to control fluid flow through each layer of the plurality of layers of the multilayer membrane by altering the electroactive polymer to provide continuous transport to control entry rate and exit rate of fluid through the multilayered membrane.

24. The method of claim 11 , comprising:
sending a control signal from

Assignees

• Elwha Llc

Inventors

• Dacey Jr Ralph G
• Hyde Roderick A
• Ishikawa Muriel Y
• Kare Jordin T
• Leuthardt Eric C
• Myhrvold Nathan P
• Rivet Dennis J
• Smith Michael A
• Tegreene Clarence T
• Wood Jr Lowell L
• Wood Victoria Y H

Classifications

• A61M1/962

  having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction · CPC title

• A61M1/918

  for multiple suction locations · CPC title

• A61M1/915

  Constructional details of the pressure distribution manifold · CPC title

• A61M1/1631

  having non-tubular membranes, e.g. sheets · CPC title

• A61M1/0088

  Human Necessities · mapped topic