US20020072673A1 - Treatment of ocular disease - Google Patents

Treatment of ocular disease Download PDF

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Publication number
US20020072673A1
US20020072673A1 US09/735,408 US73540800A US2002072673A1 US 20020072673 A1 US20020072673 A1 US 20020072673A1 US 73540800 A US73540800 A US 73540800A US 2002072673 A1 US2002072673 A1 US 2002072673A1
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Prior art keywords
canal
schlemm
microcannula
locating means
ultrasound
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Ronald Yamamoto
Stanley Conston
Michael Nash
Paul Koch
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Iscience Surgical Corp
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Individual
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Priority to US09/735,408 priority Critical patent/US20020072673A1/en
Assigned to ISCIENCE CORP reassignment ISCIENCE CORP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOCH, PAUL S., CONSTON, STANLEY R., NASH, MICHAEL F., YAMAMOTO, RONALD K.
Assigned to ISCIENCE SURGICAL CORPORATION reassignment ISCIENCE SURGICAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISCIENCE CORPORATION
Publication of US20020072673A1 publication Critical patent/US20020072673A1/en
Priority to US12/211,001 priority patent/US20090028953A1/en
Priority to US12/587,375 priority patent/US8123729B2/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00781—Apparatus for modifying intraocular pressure, e.g. for glaucoma treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Clinical applications
    • A61B8/0833—Clinical applications involving detecting or locating foreign bodies or organic structures
    • A61B8/0841—Clinical applications involving detecting or locating foreign bodies or organic structures for locating instruments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/10—Eye inspection

Definitions

  • the present invention is directed to methods and apparatus for minimally invasive ocular surgery procedures and, more particularly, to the treatment of glaucoma.
  • the anterior chamber of the eye is filled with a fluid known as aqueous humor.
  • a fluid known as aqueous humor.
  • This fluid is produced by the ciliary body located adjacent to the lens.
  • the fluid flows around the lens, through the trabecular meshwork and into an anatomical conduit, the sinus venosus sclerae, also known as Schlemm's Canal.
  • the fluid is then expelled from the canal to the episcleral veins.
  • the flow through the trabecular meshwork is reduced, thereby causing increased intraocular pressure, which can lead to degradation of the optic nerve and blindness.
  • the outflow of the trabecular meshwork is typically blocked by structural or cellular debris, which is primarily age related.
  • Various methods have been tried and used to lower the intraoptic pressure in the management of glaucoma.
  • Standard medical treatment for glaucoma involves topically applied drugs, including beta blockers, such as Timoptic, alpha adrenergic agonists and prostaglandin analogues.
  • beta blockers such as Timoptic, alpha adrenergic agonists and prostaglandin analogues.
  • the goal of these drugs is to dilate the flow tracts in the trabecular meshwork thereby increasing flow, or to reduce the production of aqueous humor by the ciliary body.
  • the success rate of drug treatment can range widely due to variabilities in patient response and drug side effects.
  • These drugs are primarily delivered via drops applied directly to the eye one or two times per day. These medical treatments must also take into account patient compliance and the high cost of the drugs over time.
  • Surgical treatment for glaucoma has been evolving over the past two decades and includes trabeculostomy, laser trabeculoplasty, implantable shunts and viscocanalostomy.
  • Trabeculostomy and laser trebeculoplasty involves opening or creating larger channels through the trabecular meshwork, either by surgical dissection or laser ablation of the tissues.
  • Implantable shunts which carry the aqueous humor from the anterior chamber directly to the sclera, require precise surgical implantation and are primarily used as a last resort when all other treatment fails. Typical such devices are disclosed by Brown, et al. in U.S.
  • shunts also involves increased surgical complications, such as infection, blebs (fluid pockets forming in the sclera at the outflow of the shunt) and blockage of the shunt over time.
  • a recently developed surgical treatment is known as viscocanalostomy.
  • the procedure involves surgically opening a flap of the sclera and dissecting down to de-roof Schlemm's Canal to increase aqueous humor drainage.
  • a high viscosity viscoelastic material is injected into the canal to dilate it, and may act to open the trabecular meshwork from the canalicular space.
  • the viscoelastic material also acts as a fibrosis inhibitor, reducing the influx of fibroblastic cells from the healing response, which would negate the effects of the procedure by blocking fluid flow.
  • 5,486,165 disclose a microcannula designed for delivery of substances to Schlemm's Canal during this procedure.
  • Grieshaber, et al. disclose an improvement to the Stegmann apparatus to deliver substances or stents for maintaining the passage of fluid in the canal. Both of these prior art citations are directed at the surgical case. While the procedure appears promising for the treatment of glaucoma, considerable training and skill is required of the practitioner. The procedure requires the precise dissection of the scleral layers and delicate manipulation of the canal, and therefore carries the concomitant risks of ocular surgery, such as infection, hypotony and endophthalmitis.
  • Imaging of the structure of the eye has been accomplished by various means. Ultrasound imaging is routinely used in the management of ocular disease, and such ultrasound scanners are available commercially. Ultrasound scanners normally operate in the frequency range of 10-20 MHz. The resolution at these frequencies is insufficient to provide tissue discrimination of fine structures associated with the anterior chamber such as Schlemm's Canal. Recently, higher frequency imaging systems have been developed as ultrasound biomicroscopes, e.g. P40 UBM, Paradigm Medical Industries, Salt Lake City, Utah. These systems provide imaging in the range of 40-60 MHz and are able to image the fine structure of tissues. High resolution ultrasound imaging of tissues with high frequency is also used in intravascular ultrasound (IUS) catheters, used for the detection and characterization of vascular disease. Thomas, et al. in U.S. Pat. No. 4,911,170 disclose such a high frequency ultrasonic imaging catheter.
  • IUS intravascular ultrasound
  • the prior art is directed at needle guides which are attached to any transducer and are capable of guiding biopsy needles to the target site. These needle guides are disposed at a narrow angle with respect to the transducer axis and therefore are not able to target sites that are directly under the transducer face with adequate accuracy as is required in the case of ophthalmic surgery.
  • EP 0881055A 1998 Gabriel, et al Method and apparatus for implanting an artificial meshwork in glaucoma surgery
  • the present invention provides non-invasive locating device of determining the location of Schlemm's Canal in the eye. Using such means to indicate the location of the canalicular space, minimally invasive procedures can then be performed using surgical devices as specified herein. Such surgical devices can be used for injecting or inserting of active or passive substances or constructs into the canal for the treatment of glaucoma. Locating devices suitable for use in the present invention include ultrasonic and optical locating or imaging devices.
  • the present invention provides minimally invasive surgical devices coupled to the locating device to access Schlemm's Canal in the eye for the delivery of treatments for ocular disease.
  • These devices include microcannulas with appropriate geometry and mechanical properties to access Schlemm's Canal through the scleral tissues under guidance of the locating device.
  • the microcannulas may be used to deliver a surgical viscoelastic material to expand the canal, or may incorporate mechanical expansion means to expand the canal directly.
  • microsurgical tools may be used with the microcannula to perform surgery on the trabecular meshwork to reduce intraocular pressure via Schlemm's Canal.
  • the present invention describes certain substances and constructs to be delivered to the eye via minimally invasive access. These materials are directed to the treatment of ocular disease and include, but are not limited to, stents, microparticles, and drug delivery materials.
  • the present invention is directed at a novel minimally invasive treatment for ocular disease, and glaucoma in particular. Beyond medicinal treatments, the prior art is directed to the surgical treatment of glaucoma. Such surgical intervention requires highly trained skills and presents the risks associated with ocular surgery.
  • the present invention is directed at an apparatus and method to localize a treatment site in the eye, advance a minimally invasive surgical device to the site and deliver substances, constructs or microsurgical tools for the treatment of the disease state.
  • an apparatus to detect the location of anatomical features such as Schlemm's Canal may operate by ultrasound examination, using either an imaging or non-imaging ultrasound system.
  • the scleral tissue containing Schlemm's Canal may be examined non-invasively with ultrasound by placing an appropriate transducer on the surface of the sclera.
  • the target location of the canal may be identified by discrimination of the ultrasound signal transmitted and received from the transducer. Characterization of the received ultrasound signal can be used to identify differences in tissue density presented by Schlemm's Canal and analysis modes such as Doppler may detect the flow of aqueous humor within the canal.
  • the ultrasound signals would ideally span a region of the sclera to allow either a video image of the region to be displayed or to provide guiding signals from the transducer assembly to guide the surgical tool to the site.
  • a surgical tool would be coupled to the transducer assembly, incorporating means to accurately advance the tool to the target tissue space identified by ultrasound.
  • the ultrasound system utilizes a high frequency transducer in order to have the resolution needed for detection of the canal, which can range from 20 to 150 microns in diameter. Ultrasound frequencies in the range of 10 to 200 MHz are preferred.
  • the ultrasound system may use various operating or analysis modalities, such as Doppler or harmonic methods to discriminate the target.
  • the ultrasound system utilizes a transducer constructed from a piezoelectric material, for example a thin piezoelectric polymer film such as polyvinylidene difluoride (PVDF), and configured to provide a broad-band focused image at 40-150 Mhz, coupled to a computer system for the transmission, reception and processing of the imaging data and display of the resultant image.
  • PVDF polyvinylidene difluoride
  • the ultrasound detection may be further enhanced by using a contrast agent as a tracer for the aqueous humor.
  • a contrast agent typically used as a contrast agent, usually air, nitrogen or high molecular weight fluorocarbon gases.
  • Gas can be delivered in its gaseous state, in the form of a low boiling-point physiologically compatible liquid, or entrapped in microspheres.
  • the gas or microspheres may be delivered to Schlemm's Canal by intra-corneal injection. Alternatively, retrograde injection into the episcleral veins of the eye may be accomplished.
  • optical imaging is used to locate the canal.
  • Fluorescein is a fluorescent tracer commonly used in ophthalmic procedures. Fluorescein may be administered to the eye and time allowed for the tracer to traverse the trabecular meshwork and into the canal. Using a high sensitivity photodetector, coupled with an illuminating source, the tracer in the canal can be visualized. Alternatively, a high intensity light source may be used to locate the canal due to the coloration differences in the surrounding structure. Furthermore, ultra-high sensitivity infrared detection may be used to detect any temperature difference between the fluid-filled canal and the surrounding scleral tissues, with our without the use of a tracer compound. Other optical methods such as optically coherent tomography or confocal imaging may also be utilized in similar fashion.
  • the locating device may consist of a base or console unit with a display and system controls, coupled to a handpiece which is used to locate the target site, or in the case of non-imaging means, may consist solely of a handpiece which contains the necessary components to effect the procedure.
  • the handpiece may be mounted on an armature apparatus that is connected to the base unit or may be attached to the operative surface with a clamping device.
  • the handpiece consists of a locating device with a surgical access device coupled to the locating device in such a manner as to allow the surgical device to advance into the target site.
  • the handpiece may comprise a single unit containing both devices, or the apparatus of the surgical device may be made attachable and detachable from the handpiece of the locating device.
  • a single unit handpiece is constructed such that the surgical device is disposed so as to enter the tissues tangentially to Schlemm's Canal, whilst an imaging means is aligned along the axis of the canal in order to visualize the procedure.
  • the surgical device is preferably held at an angle between 0 and 40 degrees from the axis of the canal.
  • An adjusting mechanism may be incorporated into the surgical access device to fine-tune the depth of penetration.
  • the surgical device is disposed coaxially with the locating device.
  • the surgical device may be located centrally between two imaging transducers, with the image from the dual transducers being combined by the image processing system.
  • the handpiece incorporating the locating device and the surgical device presents a suitable contacting surface to the eye.
  • a slight curvature of the tissue contacting surfaces of the apparatus approximating the radius of the eye aids mechanical stability for the precise surgical placement of the surgical device.
  • the contacting surfaces may also be modified to hold or deliver a coupling fluid or gel to aid energy transfer for the locating device.
  • the invention is further directed to a novel surgical access device to enter the target site using minimally invasive techniques.
  • the surgical access device is coupled to the locating device and consists of a mechanism to advance a microcannula or other surgical device into the target space while maintaining the operative position via the locating device.
  • the surgical access device comprises a microcannula, axially disposed in a retaining means, together with the mechanism to advance the microcannula into the target.
  • the locating device is used to find Schlemm's Canal and the microcannula is advanced into the canal. If an imaging system is used to target the site, then the advancement of the microcannula can progress under image guidance.
  • the microcannula is suitably dimensioned and shaped so as to be able to penetrate through the tissue of the sclera, to enter the canalicular space and to allow advancement into Schlemm's Canal with minimal risk of trauma to adjacent tissues.
  • the microcannula may incorporate a curvature approximating the 12-14 mm radius curvature of Schlemm's Canal.
  • a cutting tip to penetrate the scleral tissues may be incorporated into the microcannula tip or separately in the positioning mechanism for the surgical device, for example in a guiding outer sheath incorporating a centrally disposed obturator with a cutting tip.
  • the microcannula is advanced using manual mechanical means such as a screw mechanism or rack and pinion mechanism.
  • the microcannula is advanced using powered means such as pneumatic, hydraulic or electromechanical propulsion. In another embodiment, the microcannula is advanced using powered means and under guidance control by the imaging system.
  • the microcannula may be used to deliver drugs, or materials, such as viscoelastics or other such substances, imaging fibers or microsurgical tools.
  • the invention is further directed to constructs and microsurgical tools that are delivered into the target location by the access device in order to accomplish the treatment desired. Constructs such as biodegradable stents, microparticles and drug delivery materials are herein disclosed. Microsurgical tools such as dilators, cutters and fiber optics are included.
  • FIG. 1 shows a cross-sectional view of the anterior portion of the eye.
  • FIG. 2 shows a sectional view of the anterior portion of the eye with an ultrasound transducer or optical detector scanning to determine the location of Schlemm's Canal.
  • FIG. 3 shows a sectional view of the anterior portion of the eye with an ultrasound transducer or optical detector imaging a dilating mechanism that has been advanced into Schlemm's Canal.
  • FIG. 4 shows a side elevation view of a coupled ultrasound imaging transducer or optical detector and a microcannula surgical device.
  • FIG. 1 shows a cross-sectional view of the anterior portion of the eye, detailing the structures therein.
  • the cornea 1 is the transparent section at the most anterior part of the structure.
  • Adjacent to the cornea 1 is the opaque sclera 2 which comprises the bulk of the outer surface of the eyeball.
  • Beneath the cornea 1 lies the anterior chamber 3 which is filled with aqueous humor.
  • the iris 4 is suspended above the posterior chamber 5 and controls the amount of light entering the lens 6 .
  • the lens 6 is held in place by the suspensory ligaments 7 .
  • the aqueous humor is produced by the ciliary body 8 , and the fluid flows around the lens 6 , through the posterior chamber 5 and into the anterior chamber 3 .
  • the fluid then flows through the trabecular meshwork 9 and into Schlemm's Canal 10 .
  • the fluid is then expelled through a capillary network to the episcleral veins.
  • FIG. 2 shows a locating device in accordance with the apparatus of the present invention.
  • the locating device may be imaging or non-imaging.
  • the locating device includes a sector scanning ultrasound transducer or optical detector 11 , mounted at right angles to a handpiece 12 , through which are carried the connecting wires from a computer system (not shown).
  • the imaging plane 13 of the transducer 11 scans for the location of Schlemm's Canal 16 .
  • the transducer 11 is placed on the surface of the sclera 14 and scanned radially from the cornea 15 and limbus 17 to determine the accurate location of Schlemm's Canal 16 .
  • the tissue contacting surface of the transducer 11 is suitably curved to be able to smoothly scan the surface of the sclera.
  • the surgical device is not illustrated in this figure.
  • FIG. 3 shows a locating device and a minimally invasive microsurgical device in accordance with the apparatus of the present invention.
  • a sector scanning ultrasound transducer or optical detector 18 is shown with its imaging plane 19 located over Schlemm's Canal 22 and imaging a microcannula 20 introduced into the canal 22 .
  • the distal tip of the microsurgical device is comprised of an elastomeric dilating balloon 21 .
  • the balloon 21 may be incorporated directly into the distal end of the microcannula 20 , or a separate device having the balloon 21 mounted thereon may be introduced through the microcannula 20 .
  • the balloon 21 is shown dilating the canal 22 from its pre-surgical state 22 to an expanded state 23 .
  • the microcannula is advanced along the canal, dilating successive segments.
  • FIG. 4 shows a side elevation of an embodiment of the apparatus of the present invention incorporating a locating device, a minimally invasive microsurgical device and a surgical access device for guiding the microsurgical device in relation to the locating device.
  • An ultrasound sector scanning transducer or optical detector 24 is disposed on the bottom side of a transducer housing 25 , which is attached to a handle 26 .
  • the transducer housing 25 extends axially to form a cantilever beam 27 .
  • the cantilever beam 27 comprises a guiding sleeve 28 , an angle adjustment mechanism 29 and a thumbwheel mechanism 30 for advancing the microcannula 31 .
  • the depth of penetration of the microcannula 31 is controlled with the angle adjustment knob 32 and the axial motion of the microcannula 31 is controlled by the thumbwheel 30 advancing a lead screw 33 on the microcannula 31 .
  • the proximal end of the microcannula 31 is comprised of a female Luer fitting 34 for attachment of a syringe or the like.
  • Schlemm's Canal 35 is located using the transducer 24 , and the microcannula 31 is advanced through the sclera into the canal.
  • An experiment was performed to determine the target resolution of high frequency ultrasound.
  • An ultrasound phantom was prepared to emulate micro channels of various diameters.
  • the phantom was prepared by placing stainless steel tubing (Small Parts, Inc. Miami Lakes, Fla.) of various diameters across a standard 80 mm styrene petri dish, spaced 10 mm apart.
  • a 10% solution of gelatin, 250 bloom was prepared by heating gelatin powder in distilled water until fully in solution. The gelatin solution was poured into the petri dish until the tubes were covered to a depth of approximately 1 mm. The gelatin was allowed to solidify by cooling and subsequently the tubes were withdrawn from the petri dish leaving open channels of various diameters. Channel diameters of 110, 150, 205, 230 and 255 microns were created in this manner. Luer hub tubing connectors were bonded to the ends of the channels to allow for injection of fluids in the channels.
  • the experiment was performed in an Ultrasound Biomicroscope (UBM, Humphreys, Inc., Model PB-40) which has a transducer frequency of 50 Mhz.
  • the UBM consisted of a single crystal imaging system with the transducer mounted on a scan translator operating at 8 Hz.
  • the ultrasound phantom was placed on a flat surface, and a small amount of water was placed on top to act as a coupling agent between the transducer and the phantom.
  • the phantom was scanned using B-mode imaging.
  • the channels were imaged in axial and perpendicular directions and at various focal depths.
  • the channels were also imaged with both air and water in the lumen. In all cases, the channels were able to be imaged with the UBM.
  • the 50 Mhz system was capable of target resolution and discrimination for the complete range of phantom channel diameters simulating the ultrasound detection of Schlemm's Canal.
  • a unitary system is constructed comprised of a focused ultrasound transducer mounted at a right angle to the handpiece and an injection system coupled to the handpiece and whose axis is disposed in the same plane as the scan wedge of the transducer.
  • the transducer is connected to a hardware system comprised of a signal generator, signal receiver, an image processing system and a display.
  • the ultrasound imaging system is used to determine the location of Schlemm's Canal.
  • the ultrasound transducer operating between 40 and 150 MHz transmit frequency is used to image the episcleral tissues near Schlemm's Canal.
  • the ultrasound system has an axial and lateral resolution of at least 60 microns for imaging of fine structures and is capable of discriminating Schlemm's Canal, whose central axis is disposed between 450-600 microns beneath the scleral surface.
  • the tissue contacting surface of the transducer is curved to accommodate the curvature of the eye and a slight raised ridge around the circumference of the face keeps coupling gel in place.
  • An ultrasonic coupling gel is placed on the eye of the subject and then the transducer is placed in contact with the eye.
  • a scan is made of the sclera, with the transducer scan plane tangential to the limbus, and proceeding radially from the limbus until the structure of Schlemm's Canal is seen on the ultrasound image or detected from reflected ultrasound characteristics of the canal.
  • An injection system is comprised of a microcannula, disposed within a guiding means.
  • the microcannula has a distal diameter between 50 and 150 microns and the distal end is beveled so as to allow tissue penetration.
  • the injection system is disposed at a 90 degree angle to the handpiece, and as such is in the plane of Schlemm's Canal to affect tangential access.
  • the angle of the injection system is capable of being tuned to a fine degree by an angle adjusting screw mechanism disposed at right angles to the axis of advancement.
  • the proximal end of the microcannula is fabricated with a fine pitch screw thread and a thumbwheel mechanism in the guiding means allows controlled advancement of the microcannula.
  • the injection system is accurately aligned to the ultrasound scan plane so as to allow the microcannula to hit a target point within the canal.
  • the microcannula Under ultrasound or visual guidance, the microcannula is advanced through the episcleral tissue and into the canal. The proper access of the canal may be seen by the positioning of the microcannula tip in reference to the ultrasound image, and confirmed by the flashback of aqueous humor into the microcannula or by fluid flow identified by the ultrasound characteristics such as Doppler analysis.
  • a compliant dilating mechanism is disposed through the microcannula and into the canal.
  • the dilating mechanism has an elastomeric expandable distal end, which is inflated via a syringe attached to the proximal end.
  • the dilating mechanism is alternately expanded, deflated and then advanced to another portion of the canal.
  • the dilating portion is constructed to achieve a final outer diameter between 200 and 300 microns and is used to expand the canal and to thereby open up the trabecular meshwork to allow increased aqueous humor flow.
  • a microsurgical system as described in Example 2 is adapted for introduction of the microcannula by mechanized means under guidance from the processed ultrasound signal.
  • the control system is designed to provide introduction and redirection of the microcannula as determined by the known location of the microcannula tip relative to the estimated location of Schlemm's Canal from the ultrasound imaging and analysis system.
  • An ultrasound contrast agent may be pre-delivered to the region to aid detection of Schlemm's Canal.
  • the ultrasound contrast agent may comprise stabilized or encapsulated gas bubbles of a physiologically compatible gas.
  • the gaseous ultrasound contrast agent may be derived as a low temperature boiling-point fluorocarbon emulsion or liquid that has been injected.
  • the gas can be injected into the anterior chamber of the eye, near the trabecular meshwork to flow into Schlemm's Canal.
  • the gas is delivered via retrograde injection into the episcleral veins. A small stab wound is made into the anterior chamber in order to partially drain the aqueous humor. This sets up a retrograde flow that allows venous blood to enter into Schlemm's Canal.
  • the reverse flow carries the gas into the canal. The presence of the gas will allow easy detection with an ultrasound scanner by enhancing the ultrasound reflectivity of the canal.
  • a non-imaging ultrasound guidance system is utilized to locate Schlemm's Canal.
  • a handheld ultrasound tool with a transducer tip and integrated microcannula apparatus is used to probe the sclera, where the ultrasound tool provides threshold discrimination of tissue density at a depth of 0.3 to 4 mm in depth.
  • a signaling light, audio output or other signaling means on the ultrasound tool is triggered upon locating the transducer tip over Schlemm's Canal.
  • a mechanical advancement device for the microcannula is activated, advancing the distal tip of the microcannula to the appropriate depth identified by the ultrasound detection system.
  • a 1 mg/ml solution of sodium fluorescein was prepared in physiological buffer to act as an optical marker.
  • An ex-vivo porcine eye was dissected in the scleral region to an approximately 1 mm depth and a 30 gauge needle used to create a short needle tract of approximately 1 cm in length, 0.5 mm from the surface to simulate Schlemm's Canal of the eye found in humans and primates.
  • the tract was filled with the sodium fluorescein solution as an optical marker.
  • a medium intensity ultraviolet light, (UVP, 366 nm) was used to visualize the optical marker from the surface of sclera, demonstrating clear visualization of the simulated canal for microcannulation either manually or with computer guidance.
  • fluorescein tracer is administered to the eye of the patient.
  • a high sensitivity photodetector is used to detect the fluorescence in the canal.
  • the detector apparatus is moved radially outward from the limbus until detection of the canal is achieved.
  • the apparatus consists of a focused ultraviolet light source of output wavelength at the peak fluorescence absorption wavelength of the tracer and a highly sensitive photodetector effective near the peak emission wavelength of fluorescein.
  • an indicator light illuminates or a buzzer sounds when the fluorescein is detected.
  • a mechanical guidance device for the microcannula is attached to the handpiece, allowing the microcannula to be advanced into Schlemm's Canal upon signals from the optical detection system.
  • Schlemm's Canal is located using means similar to Examples 1-4.
  • An access device is attached to the handpiece of the locating device.
  • the device consists of a microcannula, slidably disposed in a sheath, with means for advancing the microcannula into the injection site.
  • the microcannula has a distal dimension between 50 and 150 microns diameter and a distal tip that is beveled so as to have a tissue penetrating point.
  • the microcannula is advanced into a target site, such as Schlemm's Canal. If an imaging means is used, then the location of the microcannula tip is confirmed during placement by the imaging system.
  • the microcannula is used to deliver a construct such as an expandable stent into the canal.
  • the stent may comprise permanent or biodegradable materials.
  • the stent may be in the form of a solid tube structure with openings in the side to allow fluid flow, a tube structure fabricated from a mesh or a matrix or sponge-like cylinder.
  • a microcannula guided by the locating device is inserted into the canal.
  • the microcannula is used to deliver a viscoelastic material to the canal.
  • the viscoelastic material may comprise permanent or biodegradable materials.
  • the viscoelastic material is comprised of sodium hyaluronate.
  • a microcannula guided by the locating device is inserted into the canal to allow access of microsurgery tools for direct surgical intervention on the trabecular meshwork.
  • the tools may include scissors, cutters, dilators or other such devices.
  • the microcannula may be used to introduce fiber optic or laser devices to perform imaging or phototherapeutic procedures.
  • a microcannula guided by the locating device is inserted into the canal to deliver microspheres to the canal.
  • the microspheres may comprise permanent or degradable materials.
  • the microspheres act as a dilation mechanism for the canal, while the interstices between the microspheres allow fluid flow through the canal.
  • a microcannula guided by the locating device is inserted into the canal, wherein the microcannula is used to deliver a drug-containing material to the canal.
  • the material is intended to deliver drugs suitable for the treatment of ocular disease.
  • the drug delivery means may comprise permanent or biodegradable materials.
  • the material may partly comprise the drug, or contain the drug within reservoirs such that the drug is released during degradation or leached out with the flow of aqueous humor through the material.
  • the material may be in the form of an implant to provide long term drug delivery.
  • the implant may be in the form of a solid, porous or sponge-like device.
  • a microcannula guided by the locating device is inserted into the canal, wherein the microcannula is used to deliver microsurgical tools to areas of the eye including Descemet's window and the trabecular meshwork for increasing the flow of aqueous into Schlemm's Canal.
  • a microcannula guided by the locating device is inserted into the canal, wherein the microcannula is used to deliver implants which increase the flow of aqueous through the trabecular meshwork and into Schlemm's Canal.

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  • Ultra Sonic Daignosis Equipment (AREA)
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ATE303757T1 (de) 2005-09-15
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US20100179652A1 (en) 2010-07-15
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AU784936B2 (en) 2006-08-03
US8123729B2 (en) 2012-02-28

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