WO2007018494A1 - Procédés et systèmes pour contrebalancer un dispositif de faisceau de balayage - Google Patents

Procédés et systèmes pour contrebalancer un dispositif de faisceau de balayage Download PDF

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Publication number
WO2007018494A1
WO2007018494A1 PCT/US2005/026263 US2005026263W WO2007018494A1 WO 2007018494 A1 WO2007018494 A1 WO 2007018494A1 US 2005026263 W US2005026263 W US 2005026263W WO 2007018494 A1 WO2007018494 A1 WO 2007018494A1
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WO
WIPO (PCT)
Prior art keywords
counterbalance
actuation element
actuation
scanning
force
Prior art date
Application number
PCT/US2005/026263
Other languages
English (en)
Inventor
Charles David Melville
Original Assignee
University Of Washington
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University Of Washington filed Critical University Of Washington
Priority to PCT/US2005/026263 priority Critical patent/WO2007018494A1/fr
Priority to JP2008522755A priority patent/JP2009501960A/ja
Priority to EP05776416A priority patent/EP1910883A4/fr
Publication of WO2007018494A1 publication Critical patent/WO2007018494A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10594—Beam path
    • G06K7/10603—Basic scanning using moving elements
    • G06K7/10633—Basic scanning using moving elements by oscillation
    • G06K7/10643—Activating means
    • G06K7/10653—Activating means using flexible or piezoelectric means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00097—Sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00165—Optical arrangements with light-conductive means, e.g. fibre optics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00172—Optical arrangements with means for scanning
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3502—Optical coupling means having switching means involving direct waveguide displacement, e.g. cantilever type waveguide displacement involving waveguide bending, or displacing an interposed waveguide between stationary waveguides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
    • G02B6/3566—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details involving bending a beam, e.g. with cantilever
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
    • G02B6/3568—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details characterised by the actuating force
    • G02B6/3578—Piezoelectric force

Definitions

  • the present invention is directed to scanning beam devices. More specifically, the present invention is related to methods and systems for counterbalancing a drive assembly in a scanning fiber device.
  • an improved scanning beam system has recently been developed by the University of Washington which involves the use of a cantilevered optical fiber that is scanned in one or two dimensions to project light out of the end of the optical fiber to form an image on a target area.
  • image acquisition is also possible with the addition of a sensor, such as a photosensor.
  • a sensor such as a photosensor.
  • the light projected out the end of the cantilevered, scanning optical fiber is reflected from the target area and the backscattered light is captured and measured with the sensor in time series.
  • the reflected light intensity measured at the sensor can be sequentially correlated with the known position of the optical fiber, and a two-dimensional image may be created one 'pixel' at a time.
  • Some exemplary scanning fiber devices of such type are described in U.S. Patent Nos. 6,294,775 Bl (Seibel) and 6,563,105 B2 (Seibel) and U.S. Patent Application Publication Nos. 2001/0055462 Al (Seibel) and 2002/0064341 Al (Seibel), the complete disclosures of which are incorporated herein by reference.
  • optical fiber technology offers many advantages.
  • the small mass of the optical fiber scanner allows high scan angles at video rates - typically between about 1 kHz and about 50 kHz, and preferably between about 5 kHz and about 25 kHz.
  • Optical fiber scanners also have a smaller 'footprint', taking up less space and can be conveniently packaged into a small ( ⁇ 1 mm) diameter cylindrical endoscope or catheter housing.
  • scanning fiber systems that scan the optical fiber about two-axes typically include an actuation element or drive assembly coupled to the scanning element.
  • the scanning element e.g., optical fiber
  • the scanning element extends from a distal end of the drive assembly so that actuation of the drive assembly causes the optical fiber to move in a periodic motion that substantially corresponds to the motion of the drive assembly.
  • actuation of the drive assembly will often cause transverse forces (e.g., accelerations) and torques to the scanning fiber device which may detrimentally affect image formation and image acquisition of the target area. There is also a relatively very small axial force on the fiber.
  • a stationary object may be attached to a proximal end of the drive assembly.
  • the stationary object is typically many times more massive (e.g., typically between about twenty times as massive and forty times as massive) than the drive assembly and the optical fiber.
  • the present invention provides methods, systems and devices for counterbalancing drive assembly and scanning element of a scanning beam device.
  • the counterbalancing may be carried out with a "virtual mass" and does not require a large mass to counterbalance the drive assembly and scanning element. Consequently, the low-profile size of the housing of the scanning beam device may be maintained.
  • the present invention provides a scanning beam device that comprises an actuation element coupled to a beam scanning element.
  • the actuation element generates a transverse force and/or a torque to move the beam scanning element along one or more axes of motion.
  • the scanning beam device further includes a counterbalance that is coupled to the actuation element that generates a force and/or torque that is substantially equal and substantially opposite to the transverse force and/or torque generated by the actuation element.
  • the present invention provides a scanning beam device that comprises actuation means for generating an actuation force and/or torque to actuate movement of beam scanning means.
  • Counterbalancing means generate a counterbalancing, force and/or torque that is substantially equal and substantially opposite to the actuation, force, and/or torque generated by the actuation means.
  • the present invention further provides methods of counterbalancing a scanning beam device.
  • the method comprises providing a scanning beam device that has a beam scanning element coupled to an actuation element, and a counterbalance operatively coupled to the actuation element.
  • the beam scanning element is actuated with at least one of a force and torque provided by the actuation element.
  • the force and/or torque provided by the actuation element is counterbalanced with a force and/or torque that is substantially equal and substantially opposite to the force and/or torque provided by the actuation element.
  • the present invention further provides an open loop control system for driving the counterbalance. In an open-loop control system, an input drive signal is used to control both the drive assembly and the counterbalance.
  • the input drive signal may be sent to a counterbalance control, where an algorithm may be used on the input drive signal to generate an output drive signal for the counterbalance. Based on the output drive signal, the counterbalance will generate forces and/or torques that are substantially equal and opposite to the forces and/or torques generated by the drive assembly.
  • the present invention provides a closed loop control system for driving the counterbalance.
  • the closed-loop control system is similar to open-loop the open loop control system described above, except that the closed-loop system comprises one or more sensors that are used to detect the motion of an attachment point between the drive assembly and the counterbalance.
  • the algorithm(s) stored in the counterbalance control may then determine the appropriate output drive signal to send to the counterbalance to compensate for the movement at the attachment point.
  • the closed loop control system may also be able to compensate for system perturbations.
  • FIG. 1 schematically illustrates a simplified scanning beam system that is encompassed by the present invention.
  • FIG. 2 is a close up of a distal end of a scanning beam device that comprises a drive assembly and a scanning element that is an optical fiber.
  • FIG. 3 illustrates one embodiment of the present invention in which a counterbalance is coaxially disposed around the drive assembly.
  • FIG. 4 is a cutaway of FIG. 3 which illustrates a proximal attachment point between the counterbalance and the drive assembly.
  • FIG. 5 is a block diagram that illustrates an open-loop control system that is encompassed by the present invention.
  • FIG. 6 is a block diagram that illustrates a closed-loop control system that is encompassed by the present invention.
  • FIG. 7 illustrates an embodiment of a counterbalance that comprises a sensor.
  • FIG. 8 illustrates a block diagram of a counterbalance system that provides system perturbation compensation.
  • FIG. 9 illustrates a kit encompassed by the present invention.
  • the present invention provides methods and scanning beam devices that comprise a counterbalance to counterbalance forces and/or torques caused by the drive assembly and by the actuation of the scan element.
  • Scanning beam systems of the present invention generally include a scanning beam device and a base station for controlling the scanning beam device.
  • the scanning beam devices of the present invention may take on a variety of forms, but are typically in the form of a flexible or rigid endoscope, catheter, fiberscope, microscope, or a boroscope.
  • the scanning beam devices of the present invention may be a limited use device (e.g., disposable device) or a multiple-use device. If the device is for medical use, the scanning beam devices of the present invention will generally be sterile, either being sterilizable or being provided in hermetically sealed package for use.
  • the scanning beam devices of the present invention include a scanning element for scanning a beam of light onto a target area.
  • the scanning element preferably comprises a single, cantilevered optical fiber.
  • the terms “scanning beam system” and “scanning fiber system” will be used generally to encompass systems that are used for image display and/or image acquisition.
  • FIG. 1 is a block diagram of one scanning beam system 10 that is encompassed by the present invention.
  • the scanning beam system 10 includes a base station 12 and a scanning beam device 14.
  • the scanning beam device 14 includes a connector member 16 that is configured to mate with an input interface 18 on the base station. Coupling of the connector member 16 to the input interface 18 may create a power path, drive signal path, detector path, illumination path, and/or data communication path between elements of the base station 12 and related elements of the scanning beam device 14.
  • base station 12 typically includes a controller 20 that has one or more microprocessors and/or one or more dedicated electronics circuits which may include a gate array (not shown) which may control the actuation of the scanning beam device 14 and generation of the images. Controller 20 may also include scanner drive electronics, detector amplifiers, D/ A converters, and AfD converters (not shown). The drive electronics in controller 20 and the software modules stored in memory may be used to provide a customized control routine for the scanning beam device 14. As will be appreciated by those of skill in the art, the methods of the present invention may be carried out by the software modules, the electronics hardware in the controller, or a combination thereof.
  • Controller 20 is in communication with a plurality of components within the base station 12 via a communication bus (not shown).
  • the communication bus typically allows for electrical communication between controller 20, a power source 22, memory 24, user interface(s) 26, one or more light sources 28, one or more output displays 30, and a photosensitive position sensor 31 that is coupled to a calibration chamber 33.
  • the scanning beam device 14 includes a detector assembly
  • the base station 12 may include a separate image storage device 32 in communication with controller 20.
  • the image storage device 32 may simply be a module within memory 24.
  • the base stations 12 of the present invention will vary, and may include fewer or more elements than illustrated in FIG. 1.
  • the light source 28 may emit a continuous stream of light, modulated light, or a stream of light pulses.
  • Base station 12 may comprise a plurality of different light sources 28 so as to be able to operate different scanning beam devices that have different illumination capabilities.
  • the light sources 28 may include one or more of a red light source, blue light source, green light source (collectively referred to herein as a "RGB light source”), an IR light source, a UV light source, and/or a high intensity laser source (typically for a therapeutic scanning beam device).
  • the light sources 28 themselves may be configured to be switchable between a first mode (e.g., continuous stream) and a second mode (e.g., stream of light pulses).
  • Memory 24 may be used for storing the software modules, look-up tables, counterbalancing control algorithms, and other algorithms that control the operation and/or calibration of the scanning beam device 14.
  • the control routine used by the controller 20 for controlling and counterbalancing the scanning beam device 14 will typically be configurable so as to match the operating parameters of the attached device (e.g., resonant frequency, voltage limits, zoom capability, color capability, etc.).
  • memory 24 may also be used for storing the image data received from the detector assembly 44 of the scanning beam device, remapping look-up tables and algorithms, remapped drive signals, parameters of the scanning beam device, etc.
  • base stations 12 For ease of reference, other conventional elements in the base station 12 are not shown.
  • embodiments of the base stations 12 of the present invention will typically include conventional elements such as amplifiers, D/ A converters and AfD converters, clocks, waveform generators, and the like.
  • a more complete description of the base stations, and its interaction with the scanning beam devices are more fully described in commonly owned U.S. Patent Application Serial No. 10/956,241, entitled “Remapping Methods to Reduce Distortions in Images," filed October 1, 2004 and U.S. Patent Application Serial No. 10/956,473, entitled “Configuration Memory for a Scanning Beam Device," filed October 1, 2004, U.S. Patent Application Serial No.
  • the scanning beam devices 14 of the present invention includes a scanning element 34 for delivering and scanning a beam of light onto the target area.
  • a waveguide 38 typically in the form of an optical fiber (which may be a continuation of scanning element 34), is optically coupled to the light source(s) so as to deliver illumination from the light source 28 to the scanning element 34.
  • An actuation element or driving assembly 40 is coupled to the scanning element 34 and is adapted to actuate the scanning element 34 according to a drive signal received from the controller 20.
  • the scanning beam device 14 may include a non-volatile memory 39 for storing identification data or parametric data of the scanning beam device 14. While not shown in FIG.
  • the scanning beam device 14 will typically include an optical assembly that directs and focuses the light directed out of a distal tip of the scanning element 34.
  • the scanning element 34 is a cantilevered optical fiber and the drive assembly 40 is a piezoelectric "tube bender.”
  • the optical fiber scanning element 34 comprises a proximal portion 52 (shown in FIGS. 3 and 4) and a distal portion 54 that comprises a distal tip 56.
  • Optical fiber 34 is typically fixed along at least one point of the optical fiber so as to be cantilevered such that the distal portion 54 is free to be deflected in its desired scan pattern.
  • the proximal portion of the optical fiber is the waveguide and will transmit light from light source 28 (FIG. 1).
  • a separate waveguide may be optically coupled to the proximal portion of the optical fiber 34 so that illumination from light source 28 will be directed into the core of optical fiber 34 and out of the distal tip 56.
  • the optical fiber 34 may have any desired dimensions and cross-sectional profile. Depending on the desired characteristics of the device, the optical fiber 34 may have a symmetrical cross-sectional profile or an asymmetrical cross-sectional profile.
  • optical fiber 34 with a round cross-sectional profile will have substantially the same resonance characteristics about any two orthogonal axes, while an optical fiber with an asymmetric cross- sectional profile (e.g., ellipse) will have different resonant frequencies about the major and minor axes.
  • the optical fiber 34 may be linearly or non-linearly tapered along its longitudinal length.
  • the cantilevered distal portion 54 of the optical fiber 34 will be coupled to drive assembly 40, which is shown in FIG. 2 as a cylindrical, piezoelectric tube bender.
  • Drive assembly 40 will typically move in one or two dimensions (as indicated by the arrows 53 ) to drive the cantilevered distal portion 54 in a one or two dimensional scan pattern (as shown by arrows 55) at a frequency that is within a Q-factor of the resonant frequency of the distal portion of the optical fiber, and preferably at its mechanical or vibratory resonant frequency (or harmonics of the resonant frequency).
  • the scanning element 34 does not have to be driven at substantially the resonant frequency, but if the scanning element 34 is not scanned at its resonant frequency, a larger amount of energy will be required to provide the desired radial displacement for the scan pattern.
  • the drive assembly is a piezoelectric drive assembly.
  • a drive signal from controller 20 delivers a desired signal to the drive assembly 40 and the drive signal causes the piezoelectric drive assembly 40 to deflect the distal tip 56 of the optical fiber 34 so that the illumination spot is scanned in a desired scan pattern.
  • preferred drive assemblies are piezoelectric assemblies, in alternative embodiments, the drive assembly 40 may comprise a permanent magnet, a electromagnet, an electrostatic drive, a sonic drive, an electro-mechanical drive, or the like.
  • Actuation of the drive assembly 40 and movement of the scanning element 34 typically causes one or more transverse forces and/or torques to the scanning beam device.
  • transverse forces and/or torques will be transferred to a proximal attachment of the drive assembly.
  • the drive assembly proximal attachment must be attached to an object that is stable - that is, the proximal attachment should not be perturbed or vibrated by the drive assembly, or it should have a low velocity that is constant (which would be the case when the scanning beam device as a whole is moved).
  • a mass 59 may be coupled to a proximal end of the drive assembly 40 to passively balance the forces and/or torques caused by the drive assembly 40 and actuation of the scanning element 34.
  • FIG. 3 shows one embodiment of a counterbalance 60 for a cylindrical drive assembly 40 that is in the form of a piezoelectric bender tube.
  • FIG 4 shows the counterbalance 60 with one half cut away to show the inner, piezoelectric bender tube drive assembly 40.
  • Mechanical impedance is defined as "the ratio of force to velocity, where the velocity is a result of that force only.” If the object (e.g., mass or virtual mass) attached to the proximal end of the drive assembly 40 has a low mass, the system will have a low mechanical impedance because of the high velocities caused by the applied forces from the drive assembly. In contrast, a very large mass will yield high mechanical impedance that has low mass velocities.
  • the counterbalances 60 of the present invention typically acts like a very large mass because the velocities will be very low.
  • the drive assembly 40 shown in FIGS. 3 and 4 is in the form of a piezoelectric tube bender that has electrodes that are positioned so that a distal, free end of the tube bender drive assembly 40 can be actuated to move in all directions (e.g., moved 360° in a plane of the distal end face) relative to the counterbalance 60. To accomplish this motion, electrodes 64 are patterned in quadrants around a circumference of the piezoelectric tube bender 40.
  • a wire (not shown) runs from the controller 20 to each of the quadrants.
  • the conductive lining of the inside of the piezo tube (which is not divided into quadrants) is typically the common return path for all the quadrants. Since typically the quadrants are energized in opposing pairs with opposite polarity of equal voltages, the inside of the piezo tube does not have to be the return path, but floats in voltage near zero volts.
  • the paired quadrants act like two identical capacitors in series, with the common connection being 1 A the applied voltage.
  • the counterbalance 60 is disposed coaxially around the tube bender drive assembly 40.
  • the counterbalance 60 is in the form of a second piezoelectric tube bender of a similar shape as the drive assembly 40.
  • the illustrated embodiment provides two coaxially disposed piezoelectric tubes, it should be appreciated that the present invention is not limited to such a configuration.
  • the drive assembly 40 may be a solid element, and may have any type of cross-section (e.g., round, square, ellipse, polygon, free form, etc.) and the counterbalance 60 may have similar shape or a different shape from the drive assembly.
  • the drive assembly may have a round cross section and the counterbalance could have a square cross-section, or vice-versa.
  • the counterbalance should be properly positioned in relation to the drive assembly and scanning beam assembly. If the counterbalance shape is incorrect (relative to the drive assembly), and/or placed incorrectly, the counterbalance 60 will not counter the forces and/or torques as desired. In fact, the counterbalance 60 may produce new undesired forces from the misalignment.
  • the drive assembly and the counterbalance are objects with radial symmetry (with the best being circular in cross section), and the attachment between the counterbalance 60 and drive assembly 40 are made so that the axes of symmetry coincide. Additionally, the centers of mass of both the drive assembly 40 and counterbalance 60 coincide, so as to provide for maximum counterbalancing. If the center of masses do not exactly coincide, some counterbalancing is still is being performed, but at a much lower quality.
  • the masses of the drive assembly 40 and the counterbalance 60 may or may not be equal. In cases where the masses of the drive assembly 40 and counterbalance 60 are not equal, such a combination requires the drive assembly 40 and counterbalance 60 to have different accelerations and velocities to provide the appropriate counterbalance. But, if the masses are equal, the accelerations and velocities will be the same.
  • the drive assembly 40 and counterbalance 60 do not have to based on a piezoelectric material, and instead they may be a permanent magnet, an electromagnet, an electrostatic drive, a sonic drive, an electro-mechanical drive, electro -restrictive, magneto-restrictive, or a combination thereof, so as to counterbalance cyclic movement caused by actuation of the drive assembly.
  • the bender tube drive assembly 40 and the counterbalance 60 are preferably attached only at their proximal ends - which is the stationary end and the distal end of the bender tube drive assembly 66.
  • the counterbalance 60 and drive assembly 40 are spaced from each other (except for at the attachment point 62) so as to allow a distal end 68 of the counterbalance 60 and a distal end 66 of the drive assembly 40 to move relative to each other.
  • the counterbalance 60 is also patterned in quadrants like the bender tube drive assembly 40 that actuates the optical fiber scanning element 34.
  • the drive assembly generates a force at distal end 66. If the drive assembly 40 was coupled to the counterbalance 60 at or near its longitudinal center, such an attachment point would reduce the drive assembly's ability to generate the desired force (and deflection) at its distal end 66. Specifically, in the case of a piezoelectric drive assembly, if the center of the piezoelectric drive assembly was coupled to the counterbalance 60, only half as much force would be generated at the distal end of the drive assembly 40. Since force is required to scan the scanning element 34, half of the force will move the scanning element less, which is generally not desirable.
  • the counterbalance 60 does not necessarily have to be coaxial with the drive assembly.
  • the counterbalance merely has to produce equal and opposite forces and/or torques to the drive assembly, and any relative configuration between the counterbalance 60 and drive assembly may be used.
  • additional objects can be used to transfer the forces and torques between them.
  • the outer counterbalance tube 60 will also be oscillating, but 180° out of phase with the inner bender tube drive assembly 40.
  • the counterbalance will have an amplitude of motion that is sufficient to substantially cancel the inner bender tubes forces and torques so that the attachment point 62 will be stationary. If the same principle is applied for more complex inner bender tube drive assembly 40 motions, the outer counterbalance tube 60 may simply "mirror" these motions. [0051] It should be noted that the amplitude motion of the drive assembly 40 and the counterbalance 60 will not necessarily be the same.
  • the counterbalance of the present invention is typically driven with a counterbalance control system 70 ⁇ See FIGS. 5, 6, and 8).
  • the counterbalance control system may be part of controller 20 (FIG. 1) or control 70 may be a separate control in base station 12 or coupled to scanning beam device 14.
  • FIG. 5 shows one exemplary embodiment of an open-loop control system
  • FIGS. 6 and 8 shows exemplary embodiments of a closed-loop control system. While the open-loop and closed-loop control are preferred, it may be possible to use other systems to control the counterbalance.
  • FIGS. 5, 6 and 8 illustrate the drive assembly 40 and counterbalance 60 as being separate from each other. However, in the actual configurations, the drive assembly 40 and counterbalance 60 will be coupled to each other, as described above, hi the open-loop control system 72 of FIG. 5, an input drive signal 74 is used to directly control the tube bender drive assembly 40 and to generate an output signal 76 to control the counterbalance 60. In the embodiment illustrated in FIG. 5, the input drive signal is sent to both the drive assembly 40 and to control 70.
  • an algorithm may be used on the input drive signal 74 to generate an appropriate output drive signal 76 for the counterbalance 60.
  • This algorithm can be a simple math function or it may be a more complex math function.
  • a simple algorithm may just invert the input drive signal 74 and output the inverted drive signal as the output signal 76 to the counterbalance 60.
  • An example of a complex algorithm would be a look-up table that is used for each input drive signal as it varies in time.
  • a closed-loop control system 78 is similar to open-loop with the exception of the addition of one or more sensors 80.
  • Sensor 80 may be used to detect the motion of the attachment point 62 (shown in FIGS. 3 and 4) between the drive assembly 40 and the counterbalance 60 using inertia.
  • Inertial sensors detect accelerations, typically of a mass in the sensor itself.
  • FIG. 7 shows one embodiment of an inertial sensor 80 as it is coupled to the attachment point 62.
  • the inertial sensor 80 illustrated in FIG. 7 may be in the form of a tube of piezoelectric material. Similar to the above illustrated piezoelectric drive assembly 40 and piezoelectric counterbalance, the tubular piezoelectric inertial sensor may comprise quadrant electrodes (not shown). However, unlike the drive assembly 40 and the counterbalance 60, the electrodes on the inertial sensor 80 that are not energized, but instead generates an output potential signal (voltage) 82 that is approximately proportional to the amount that the inertial sensor 80 is bent. The mechanism that bends the inertial sensor 80 is typically its own inertia when accelerated. Since the inertial sensor 80 is attached to the attachment point 62 it senses any movement at the attachment point.
  • the inertial sensor 80 is accelerated in a particular direction generating a voltage signal 82 on one or more electrodes from the resultant bending.
  • the control 70 receives the generated voltage signal 82 (and the input control signal 74), and using an algorithm stored in control 70, determines the appropriate output drive signal 76 to send to the counterbalance 60. Using this method a nearly motionless attachment point 62 may be realized.
  • a sensor 80 may be used to detect "system" perturbation (e.g., a system perturbation would be a force and/or torque caused by a bumping, rotation, movement, vibration, etc. of the scanning beam device as a whole).
  • optical fiber scanning element 34 acts like a cantilever spring it can flex from its inertia by accelerations. Such systematic forces and/or torques may cause the scanning element 34 to deviate from its intended path of motion (e.g., its scan pattern).
  • sensor 80 may be used to detect these system forces and/or torques and output voltage signals 82 to the control 70 to compensate for the system accelerations.
  • the perturbations from external movement will have a much lower frequency spectrum.
  • a low pass filter (not shown) can be used to separate the higher frequency drive assembly and counterbalance signal from the low frequency perturbations.
  • An algorithm in the control 70 may be configured to (1) generate adjusted drive signals 74' which are then sent to the tube bender drive assembly 40 and/or (2) to generate the output drive signal 76 for driving the counterbalance 60.
  • FIG. 9 illustrates a kit 100 encompassed by the present invention.
  • the kit 100 may include a scanning beam device (SFD) 14 (such as an endoscope), instructions for use (IFU) 102, and at least one package 104.
  • the kit 100 may include a computer readable medium (CRJvI) 106 that is integral with the SFD 14 (such as a non-volatile memory) or separate from the SFD (e.g., CD, DVD, floppy disk, etc.)
  • the scanning fiber device 14 will generally be as described above, and the instruction for use (IFU) 102 will set forth any of the methods described herein.
  • Package 104 may be any conventional device packaging, including pouches, trays, boxes, tubes, or the like. IFU 102 will usually be printed on a separate piece of paper, but may also be printed in whole or in part on a portion of the package 104.

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Abstract

Procédé et système pour contrebalancer les accélérations et/ou couples causés par l’activation d’un élément d’activation (Fig. 2, 40) et d’un élément de balayage (Fig. 2, 34). Un dispositif de faisceau de balayage (Fig. 1, 14) peut comprendre un contrepoids pour générer des forces et/ou des couples sensiblement égaux et sensiblement opposés aux forces et/ou couples générés par le balayage de l’élément d’activation.
PCT/US2005/026263 2005-07-21 2005-07-21 Procédés et systèmes pour contrebalancer un dispositif de faisceau de balayage WO2007018494A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/US2005/026263 WO2007018494A1 (fr) 2005-07-21 2005-07-21 Procédés et systèmes pour contrebalancer un dispositif de faisceau de balayage
JP2008522755A JP2009501960A (ja) 2005-07-21 2005-07-21 走査ビーム・デバイスを釣り合わせる方法及びシステム
EP05776416A EP1910883A4 (fr) 2005-07-21 2005-07-21 Procédés et systèmes pour contrebalancer un dispositif de faisceau de balayage

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WO2010048234A2 (fr) * 2008-10-20 2010-04-29 University Of Washington Fixation de fibres optiques contre des tubes d'actionneurs au moyen de contrebagues servant de cales et d'adhésifs
US8212884B2 (en) 2007-05-22 2012-07-03 University Of Washington Scanning beam device having different image acquisition modes
US8305432B2 (en) 2007-01-10 2012-11-06 University Of Washington Scanning beam device calibration
US8411922B2 (en) 2007-11-30 2013-04-02 University Of Washington Reducing noise in images acquired with a scanning beam device
US8437587B2 (en) 2007-07-25 2013-05-07 University Of Washington Actuating an optical fiber with a piezoelectric actuator and detecting voltages generated by the piezoelectric actuator
US11630297B2 (en) 2017-04-04 2023-04-18 Magic Leap, Inc. Buckling mode actuation of fiber scanner to increase field of view

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JP6086674B2 (ja) * 2012-08-24 2017-03-01 オリンパス株式会社 光走査装置
JP7058122B2 (ja) * 2017-12-28 2022-04-21 株式会社日立製作所 光走査装置及び映像装置

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8305432B2 (en) 2007-01-10 2012-11-06 University Of Washington Scanning beam device calibration
US9066651B2 (en) 2007-01-10 2015-06-30 University Of Washington Scanning beam device calibration
US9639934B2 (en) 2007-01-10 2017-05-02 University Of Washington Scanning beam device calibration
US8212884B2 (en) 2007-05-22 2012-07-03 University Of Washington Scanning beam device having different image acquisition modes
US8437587B2 (en) 2007-07-25 2013-05-07 University Of Washington Actuating an optical fiber with a piezoelectric actuator and detecting voltages generated by the piezoelectric actuator
US8411922B2 (en) 2007-11-30 2013-04-02 University Of Washington Reducing noise in images acquired with a scanning beam device
WO2010048234A2 (fr) * 2008-10-20 2010-04-29 University Of Washington Fixation de fibres optiques contre des tubes d'actionneurs au moyen de contrebagues servant de cales et d'adhésifs
WO2010048234A3 (fr) * 2008-10-20 2010-06-17 University Of Washington Fixation de fibres optiques contre des tubes d'actionneurs au moyen de contrebagues servant de cales et d'adhésifs
US11630297B2 (en) 2017-04-04 2023-04-18 Magic Leap, Inc. Buckling mode actuation of fiber scanner to increase field of view

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EP1910883A1 (fr) 2008-04-16
JP2009501960A (ja) 2009-01-22

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