Medical devices utilizing optical fibers for simultaneous power, communications and control

• US 6,575,965 B1
• Filed: 11/16/2000
• Issued: 06/10/2003
• Est. Priority Date: 03/06/1997
• Status: Expired due to Term

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Lee, Abraham P., Krulevitch, Peter, Fitch, Joseph P., DaSilva, Luiz B., Clough, Robert E., Hagans, Karla G., Benett, William J., Matthews, Dennis L., Celliers, Peter M.
• Primary Examiner(s): Shaver, Kevin
• Assistant Examiner(s): Priddy, Michael B.
• Application Number:
  US09/713,988
• Time in Patent Office: 936 Days
• Field of Search: 606/15, 606/108, 607/88, 600/342
• US Class Current: 606/15
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/1214 Coils or wires
• CPC Class Codes: A61B 17/29 Forceps for use in minimally invasive surgery
• CPC Class Codes: A61B 2017/00292 mounted on or guided by flexible, e.g. catheter-like, means
• CPC Class Codes: A61B 2017/00345 Micromachines, nanomachines, microsystems
• CPC Class Codes: A61B 2017/12072 the heat created by laser light
• CPC Class Codes: A61B 2017/12077 Joint changing shape upon application of heat, e.g. bi-metal or reversible thermal memory
• CPC Class Codes: A61B 2017/2926 Details of heads or jaws
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence

Abstract

A medical device is constructed in the basic form of a catheter having a distal end for insertion into and manipulation within a body and a proximal end providing for a user to control the manipulation of the distal end within the body. A fiberoptic cable is disposed within the catheter and having a distal end proximate to the distal end of the catheter and a proximal end for external coupling of laser light energy. A laser-light-to-mechanical-power converter is connected to receive light from the distal end of the fiber optic cable and may include a photo-voltaic cell and an electromechanical motor or a heat-sensitive photo-thermal material. An electronic sensor is connected to receive electrical power from said distal end of the fiberoptic cable and is connected to provide signal information about a particular physical environment and communicated externally through the fiberoptic cable to the proximal end thereof. A mechanical sensor is attached to the distal end of the fiberoptic cable and connected to provide light signal information about a particular physical environment and communicated externally through the fiberoptic cable.

Claims

1. In a micro-mechanical system including a catheter, a fiber optic cable, a laser-light-to mechanical-power converter, and a microgripper, the improvement comprising:

an energy conversion interface mounted at a distal end of said catheter and adjacent a distal end of said fiber optic cable, said energy conversion interface being constructed to convert photon to an energy type selected from the group consisting of electrical, thermal, mechanical and acoustic, and

including means to convert an energy type to mechanical power.

2. The energy conversion interface of claim 1, wherein said energy conversion device comprises a device containing photo-thermal material.

3. The energy conversion interface of claim 2, wherein said photo-thermal material activates a mechanical device.

4. The energy conversion interface of claim 3, wherein said mecharnical device comprises a motor/actuator.

5. The energy conversion interface of claim 4, wherein said motor/actuator produces motion selected from the group comprising rotary motion and linear motion.

6. The energy conversion interface of claim 1, wherein said energy conversion device includes a quantity of ultraviolet sensitive material.

7. The energy conversion interface of claim 6, wherein said ultraviolet sensitive material disintegrates upon heating by light energy to a selected temperature in the range of 40°

to 80°

C.

8. The energy conversion interface of claim 1, wherein said energy conversion device a quantity of working fluid which produces bubbles upon heating to a temperature of 40°

to 100°

C. causing expansion of the working fluid for actuating a linear mechanism.

9. The improvement of claim 1, wherein said mechanical power produces motion selected from the group consisting of rotary motion and linear motion.

10. The improvement of claim 1, additionally including means for sensing at least one of the group consisting of temperature, pH, distance, pressure, position, and light intensity.

11. In a medical device including a catheter having a distal end adapted, to be connected to an electrically activated microdevice, the improvement comprising:

at least one optical fiber having a distal end adjacent the distal end of the catheter and a proximal end operatively connected to receive laser light, and

an energy conversion device located at said distal end of said catheter and the distal end of said at least one optical fiber and constructed to convert light energy from said optical fiber into energy of a type selected from the group consisting of electrical, thermal, mechanical, and acoustic.

12. The improvement of claim 11, additionally including sensor means activated by one or more of light energy, electrical energy, thermal energy, mechanical energy, and acoustic energy, said sensor means being constructed to sense one or more of temperature, pH, glutamate, position, distance, and light intensity.

13. An energy conversion interface, comprising:

a least one optical fiber having a proximal end and a distal end, said distal end of said optical fiber adapted to be connected to an associated light source for directing light to the distal end of said fiber, and

an energy conversion device operatively connected to receive light from the distal end of said optical fiber, said energy conversion device being selected from the group consisting of photons to thermal, photons to electrical, photons to mechanical, and photons to acoustic,

said energy conversion device comprising a photo-electric transducer,

said photo-electric transducer being operatively connected to an electrically actuated device.

14. The energy conversion interface of claim 13, wherein said electrically actuated device is selected from the group consisting of processors and sensors.

15. The energy conversion interface of claim 13, wherein said electrically actuated device comprises a sensor selected from the group consisting of pH sensors, temperature sensors, glutomate sensors, position sensors, pressure sensors, light intensity and distance sensors.

16. The energy conversion interface of claim 15, wherein said sensor is optically probed.

17. The energy conversion interface of claim 13, wherein said photo-electric transducer is operatively connected to drive a motor/actuator.

18. The energy conversion interface of claim 17, wherein said motor/actuator is constructed to produce motion selected from the group consisting of rotary and linear.

19. The energy conversion interface of claim 17, wherein said motor/actuator is operatively connected to a mechanical release mechanism.

20. The energy conversion interface of claim 13, wherein said photo-electric transducer comprises a photo-voltaic cell.

21. The energy conversion interface of claim 20, wherein said photo-voltaic cell is operatively connected to a device selected from the group consisting of microcontrollers controlling electronics units, conditioning electronics units, and source boards.

22. The energy conversion interface of claim 20, wherein said photo-voltaic cell is electrically connected to one or more components from the group consisting of resistive heating elements and bridge electrical elements.

23. The energy conversion interface of claim 22, wherein said one or more components comprises a bridge electrical element electrically connected to an electrical impedance sensor.

24. The energy conversion interface of claim 13, additionally including a member with a reflective surface, said photo-electric transducer being activated by light reflected thereon by said reflective surface.

25. The energy conversion interface of claim 24, additionally including at least another optic fiber positioned to receive light reflected by said reflective surface at its distal end for transition to its proximal end operatively connected to a point of use.

26. The energy conversion interface of claim 25, additionally including means for moving said reflective surface causing a change of intensity in light reflected by said reflective surface onto said photo-electric transducer and into said at least another optical fiber.

27. The energy conversion interface of claim 25, additionally including-a movable member which changes the intensity of the reflected light upon moving said movable member.