Stretchable polymer-based electronic device

• US 7,337,012 B2
• Filed: 04/16/2004
• Issued: 02/26/2008
• Est. Priority Date: 04/30/2003
• Status: Expired due to Fees

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Inventors: Davidson, James Courtney, Tovar, Armando R., Krulevitch, Peter A., Hamilton, Julie K., Wilson, Thomas S., Benett, William J., Maghribi, Mariam N.
• Primary Examiner(s): Layno; Carl
• Assistant Examiner(s): Heller; Tammie K
• Application Number:
  US10/825,787
• Publication Number:
  US 20040243204A1
• Time in Patent Office: 1,411 Days
• Field of Search: 600388-390, 600/393, 607/152
• US Class Current: 607/152
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/0534 Electrodes for deep brain stimulation
• CPC Class Codes: A61N 1/0541 Cochlear electrodes
• CPC Class Codes: A61N 1/0543 Retinal electrodes
• CPC Class Codes: A61N 1/0551 Spinal or peripheral nerve electrodes
• CPC Class Codes: H05K 1/0272 Adaptations for fluid transport, e.g. channels, holes
• CPC Class Codes: H05K 1/0283 Stretchable printed circuits
• CPC Class Codes: H05K 2201/0133 Elastomeric or compliant polymer elastomeric conductor H05K2201/0314
• CPC Class Codes: H05K 2201/0162 Silicon containing polymer, e.g. silicone
• CPC Class Codes: H05K 2201/09263 Meander
• CPC Class Codes: H05K 2203/0271 Mechanical force other than pressure, e.g. shearing or pulling
• CPC Class Codes: H05K 3/101 by casting or moulding of conductive material

Abstract

A stretchable electronic circuit or electronic device and a polymer-based process to produce a circuit or electronic device containing a stretchable conducting circuit. The stretchable electronic apparatus has a central longitudinal axis and the apparatus is stretchable in a longitudinal direction generally aligned with the central longitudinal axis. The apparatus comprises a stretchable polymer body and at least one circuit line operatively connected to the stretchable polymer body. The circuit line extends in the longitudinal direction and has a longitudinal component that extends in the longitudinal direction and has an offset component that is at an angle to the longitudinal direction. The longitudinal component and the offset component allow the apparatus to stretch in the longitudinal direction while maintaining the integrity of the circuit line.

Claims

1. A stretchable electronic circuit, the circuit having a central longitudinal axis and the circuit being stretchable in a longitudinal direction generally aligned with the central longitudinal axis, comprising:

a solid stretchable polymer body made entirely of poly(dimethylsiloxane), said solid stretchable polymer body made entirely of poly(dimethylsiloxane) having a polymer body longitudinal axis that is concurrent with the central longitudinal axis of the circuit,

at least one microchannel in said solid stretchable polymer body made entirely of poly(dimethylsiloxane), said at least one microchannel having a microchannel longitudinal axis that is concurrent with the central longitudinal axis of the circuit, wherein said at least one microchannel extends fully along said microchannel longitudinal axis,

a multiplicity of microchannel longitudinal components that extend in the longitudinal direction, and

a multiplicity of micro channel offset components that are at an angle to the longitudinal direction, and

an electrically conductive media contained in said at least one microchannel,

wherein said at least one microchannel and said electrically conductive media form an electronic circuit line that extends fully along said microchannel longitudinal axis and is operatively connected to said solid stretchable polymer body made entirely of poly(dimethylsiloxane), said at least one electronic circuit line extending in the longitudinal direction and having

a multiplicity of circuit line longitudinal components that extend in the longitudinal direction, wherein said multiplicity of circuit line longitudinal components include said multiplicity of microchannel longitudinal components and having

a multiplicity of circuit line offset components that extend at an angle to the longitudinal direction, wherein said multiplicity of circuit line offset components include said multiplicity of microchannel offset components,

said circuit line longitudinal component and said circuit line offset component allowing the circuit to stretch in the longitudinal direction while maintaining the integrity of said at least one circuit line.

2. The stretchable electronic circuit of claim 1 wherein said circuit line is S-shaped.

3. The stretchable electronic circuit of claim 1 wherein said circuit line is sawtooth shaped.

4. The stretchable electronic circuit of claim 1 wherein said circuit line is sawtooth shaped with the sawtooth having adjacent segments and said adjacent segments are at an angle of 45°

to each other.

5. The stretchable electronic circuit of claim 1 wherein said circuit line is sawtooth shaped with the sawtooth having rounded corners.

6. The stretchable electronic circuit of claim 1 wherein said circuit line is in the form of a serpentine channel.

7. The stretchable electronic circuit of claim 1 wherein said solid stretchable polymer body made entirely of poly(dimethylsiloxane) comprises cast poly(dimethylsiloxane).

8. The stretchable electronic circuit of claim 1 wherein said electrically conductive media comprises electrically conductive ink.

9. The stretchable electronic circuit of claim 1 wherein said solid stretchable polymer body made entirely of poly(dimethylsiloxane) comprises a microcable made entirely of poly(dimethylsiloxane).

10. A stretchable electronic circuit, the circuit having a central longitudinal axis, comprising:

a solid stretchable and flexible polymer body made entirely of poly(dimethylsiloxane), said solid stretchable and flexible polymer body made entirely of poly(dimethylsiloxane) having a polymer body longitudinal axis that is concurrent with the central longitudinal axis of the circuit,

at least one microchannel in said solid stretchable polymer body made entirely of poly(dimethylsiloxane), said at least one microchannel having a microchannel longitudinal axis that is concurrent with the central longitudinal axis of the circuit, wherein said at least one microchannel extends fully along said microchannel longitudinal axis,

a multiplicity of microchannel longitudinal components that extend in the longitudinal direction, and

a multiplicity of micro channel offset components that are at an angle to the longitudinal direction, and

an electrically conductive media contained in said at least one microchannel,

wherein said at least one microchannel and said electrically conductive media form an electronic circuit line that extends fully along said microchannel longitudinal axis and is operatively connected to said flexible polymer substrate, said at least one electronic circuit line having

a multiplicity of longitudinal components that are aligned with the central longitudinal axis of the circuit, wherein said multiplicity of longitudinal components include said multiplicity of microchannel longitudinal components, and

a multiplicity of offset components that are offset from the central longitudinal axis of the circuit, wherein said multiplicity of offset components include said multiplicity of microchannel offset components, and

wherein said longitudinal components and said offset components allow the circuit to stretch in the longitudinal direction while maintaining the integrity of said at least one circuit line.

11. The stretchable electronic circuit of claim 10 wherein said at least one circuit line is S-shaped.

12. The stretchable electronic circuit of claim 10 wherein said at least one circuit line is sawtooth shaped.

13. The stretchable electronic circuit of claim 10 wherein said at least one circuit line is sawtooth shaped with the sawtooth having adjacent segments and said adjacent segments are at an angle of 45°

to each other.

14. The stretchable electronic circuit of claim 10 wherein said at least one circuit line is sawtooth shaped with the sawtooth having rounded corners.

15. The stretchable electronic circuit of claim 10 wherein said at least one circuit line is in the form of a serpentine channel.

16. The stretchable electronic circuit of claim 10 wherein said solid flexible polymer body made entirely of poly(dimethylsiloxane) comprises cast poly(dimethylsiloxane).

17. The stretchable electronic circuit of claim 10 wherein said electrically conductive media comprises electrically conductive ink.

18. A method of producing a stretchable electronic circuit having a central longitudinal axis and being stretchable in a longitudinal direction generally aligned with the central longitudinal axis, comprising the steps of:

providing a solid stretchable polymer body made entirely of poly(dimethylsiloxane),

assuring that said solid stretchable polymer body made entirely of poly(dimethylsiloxane) has a polymer body longitudinal axis that is concurrent with the central longitudinal axis of the electronic circuit;

providing at least one microchannel in said solid stretchable polymer body made entirely of poly(dimethylsiloxane) with said at least one microchannel having a microchannel longitudinal axis that is concurrent with the central longitudinal axis of the circuit, wherein said at least one microchannel extends fully along said microchannel longitudinal axis,

a multiplicity of microchannel longitudinal components that extend in the longitudinal direction, and

a multiplicity of micro channel offset components that are at an angle to the longitudinal direction, and

filling said at least one microchannel with an electrically conductive media to assure that

said stretchable polymer body has multiplicity of circuit line longitudinal components that extend in the longitudinal direction, wherein said multiplicity of circuit line longitudinal components include said multiplicity of microchannel longitudinal components and

said stretchable polymer body has a multiplicity of circuit line offset components that extend at an angle to the longitudinal direction, wherein said multiplicity of circuit line offset components include said multiplicity of microchannel offset components,

said longitudinal component and said offset component allowing the circuit to stretch in the longitudinal direction while maintaining the integrity of said circuit line longitudinal component and said circuit line offset component.

19. The method of claim 18 wherein said step of providing a solid stretchable polymer body made entirely of poly(dimethylsiloxane) comprises casting a solid stretchable polymer body made entirely of poly(dimethylsiloxane).

20. The method of claim 18 wherein said steps of providing at least one microchannel in said solid stretchable polymer body and filling said at least one microchannel with an electrical conductive media comprises using a stamp to place a conductive ink in a desired pattern on said stretchable polymer body.

21. The method of claim 18 wherein said steps of providing at least one microchannel in said solid stretchable polymer body and filling said at least one microchannel with an electrical conductive media comprises using photolithography.

22. The method of claim 18 wherein said step of providing a solid stretchable polymer body comprises providing a solid micro cable made entirely of poly(dimethylsiloxane).