Devices and Methods for Stimulation of Tissue

• US 20090306454A1
• Filed: 05/03/2006
• Published: 12/10/2009
• Est. Priority Date: 11/08/2005
• Status: Abandoned Application

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Original Assignee: Stanford University
• Inventors: Cockerham, Kimberly P., Liu, Wentai, Liu, Anthony, Marmor, Michael F., Chul, Benjamin W., Fitzgeral, Alissa M., Santiago, Juan G., Liepmann, Dorian, Fishman, Harvey A.
• Application Number:
  US12/083,586
• Publication Number:
  US 20090306454A1
• Time in Patent Office: Days
• US Class Current: 600/9
• CPC Class Codes: A61M 2205/0244 Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology
• CPC Class Codes: A61M 2210/0612 Eyes
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: A61N 1/0543 Retinal electrodes
• CPC Class Codes: A61N 1/36017 with leads or electrodes penetrating the skin
• CPC Class Codes: A61N 1/36046 of the eye
• CPC Class Codes: A61N 1/36067 Movement disorders, e.g. tremor or Parkinson disease stimulating motor muscle A61N1/36003
• CPC Class Codes: A61N 1/37205 Microstimulators, e.g. implantable through a cannula
• CPC Class Codes: A61N 1/37288 Communication to several implantable medical devices within one patient
• CPC Class Codes: A61N 1/375 Constructional arrangements, e.g. casings
• CPC Class Codes: A61N 1/37512 Pacemakers
• CPC Class Codes: A61N 1/37518 Anchoring of the implants, e.g. fixation
• CPC Class Codes: A61N 1/3787 from an external energy source

Abstract

Devices, systems and methods are provided for directly stimulating tissues, particularly muscle tissues, to modulate muscle contractions (i.e. provide reanimation of the muscle or to suppress undesired muscle contractions). Reanimation of muscles may be desired when damage to the brain, nervous system or neuromuscular junctions have occurred, causing a muscle tissue to lack sufficient motor control. Suppression of muscle contractions may be desired in situations of pathologically hyperactive muscles, such as in conditions of muscle spasm (e.g. blepharospasm and hemifacial spasm) or muscle dystonia. Direct stimulation is achieved by delivering a chemical agent directly to the muscle tissue, particularly the motor end plate, bypassing the nerves and neuromuscular junctions which may be damaged or diseased. Implanted hybrid chemical and electromagnetic stimulation devices can modulate muscle contraction in response to signals from a controller.

Claims

1. A hybrid chemical and electromagnetic device for electrochemically stimulating tissue, comprising:

(a) a structure having one or more orifices, said structure comprising at least one reservoir for holding at least one chemical agent, wherein said at least one chemical agent is ejected from said one or more orifices to said tissue, wherein said tissue is chemically stimulated by said at least one chemical agent; and

(b) an electromagnetic stimulation device for delivering an electromagnetic stimulus to said tissue, wherein said delivery of said electromagnetic stimulus is for electrically, magnetically or electromagnetically stimulating said tissue.

2. The hybrid device as set forth in claim 1, wherein said at least one chemical agent comprises a chemical transmitter, a neurotransmitter, acetylcholine, acetylcholineresterase, chorbechol, an element, calcium, or a combination thereof.

3. The hybrid device as set forth in claim 1, wherein said structure is implantable inside a body, wherein said tissue comprises a muscle tissue, wherein said at least one chemical agent is delivered directly to a motor end plate of said muscle tissue, and wherein said delivery of said at least one chemical agent bypasses a plurality of nerves and a neuromuscular junction of said muscle tissue.

4. The hybrid device as set forth in claim 1, wherein said tissue is at least partially from a cancer tissue, a facial muscle, an eyelid muscle, or an orbicularis oculi muscle.

5. The hybrid device as set forth in claim 1, further comprising a controlling device for providing control signals to said structure, wherein said control signals control said delivery of said at least one chemical agent and said electromagnetic stimulus to said tissue.

6. The hybrid device as set forth in claim 5, wherein said tissue is from a first muscle, wherein said hybrid device further comprises a sensor device for detecting changes in a second muscle, wherein said sensor device is communicatively connected to said controlling device, and wherein said control signals can be at least partially based on said changes detected by said sensor device.

7. The hybrid device as set forth in claim 6, wherein said changes in said second muscle comprises a change in voltage, a change in current, a change in movement, or any combination thereof.

8. The hybrid device as set forth in claim 6, wherein said control signals control delivery of said at least one chemical and said electromagnetic stimulus to said first muscle, and wherein said control signals synchronize said first muscle with said second muscle.

9. The hybrid device as set forth in claim 1, wherein said structure comprises a fluid transmission surface, wherein said fluid transmission surface is fluidically connected to said at least one reservoir.

10. The hybrid device as set forth in claim 9, wherein said fluid transmission surface comprises an array of protrusions, wherein said one or more orifices are located on said protrusions.

11. The hybrid device as set forth in claim 9, further comprising a drug eluting coating, wherein said drug eluting coating is on said fluid transmission surface.

12. The hybrid device as set forth in claim 1, wherein said at least one chemical agent changes a response of said tissue to said electromagnetic stimulus.

13. The hybrid device as set forth in claim 1, further comprising a pump configured to assist in delivery of said sat least one chemical agent.

14-67. -67. (canceled)

68. A method for electrochemically stimulating tissue, comprising:

(a) implanting a delivery device within a body, wherein said delivery device comprises one or more reservoirs and one or more orifices, wherein said one or more reservoirs are for storing at least one chemical agent to be released to said tissue, wherein said delivery device can be activated to release at least one chemical agent from said one or more reservoirs to said tissue through said one or more orifices;

(b) activating said delivery device to release said at least one chemical agent to said tissue for chemically stimulating said tissue; and

(c) delivering an electromagnetic stimulus to said tissue for electrically, magnetically, or electromagnetically stimulating said tissue.

69. The method as set forth in claim 68, wherein said activating said delivery device step occurs before or simultaneous with said delivering said electromagnetic stimulus step, wherein said released at least one chemical agent changes a response of said tissue to said electromagnetic stimulus.

70. The method as set forth in claim 69, wherein said tissue comprises muscle tissue, wherein said electromagnetic stimulus is for stimulating contraction of said muscle, wherein said released at least one chemical agent reduces the electric current or potential required for stimulating said contraction of said muscle.

71. The method as set forth in claim 68, wherein said releasing of said at least one chemical agent comprises releasing said at least one chemical agent in a plurality of stimulation cycles, wherein an amount of said at least one chemical agent released per each of said stimulation cycles is less than about 200 μ

L, from about 2 nL to about 100 μ

L, or from about 2 nL to about 10 μ

L.

72. The method as set forth in claim 68, wherein said tissue is from a first muscle, said method further comprising:

detecting said changes in a second muscle; and

activating said delivery device to release said at least one chemical agents to said tissue of said first muscle based on said detecting of said second muscle.

73. The method as set forth in claim 72, wherein said activating said delivery device chemically stimulates said tissue of said first muscle, wherein said first muscle is stimulated to synchronize with said second muscle.

74. The hybrid device as set forth in claim 68, wherein said at least one chemical agent comprises a chemical transmitter, a neurotransmitter, acetylcholine, chorbechol, acetylcholineresterase, an element, calcium, or any combination thereof.