US20040254519A1 - Glaucoma treatment device - Google Patents

Glaucoma treatment device Download PDF

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US20040254519A1
US20040254519A1 US10824052 US82405204A US2004254519A1 US 20040254519 A1 US20040254519 A1 US 20040254519A1 US 10824052 US10824052 US 10824052 US 82405204 A US82405204 A US 82405204A US 2004254519 A1 US2004254519 A1 US 2004254519A1
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device
section
glaucoma
trabecular meshwork
eye
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Hosheng Tu
Olav Berheim
Morteza Gharib
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Tu Hosheng
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Hosheng Tu
Berheim Olav R.
Morteza Gharib
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F9/00Methods 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
    • A61F9/007Methods or devices for eye surgery
    • A61F9/00781Apparatus for modifying intraocular pressure, e.g. for glaucoma treatment
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F9/00Methods 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
    • A61F9/0008Introducing ophthalmic products into the ocular cavity or retaining products therein
    • A61F9/0017Introducing ophthalmic products into the ocular cavity or retaining products therein implantable in, or in contact with, the eye, e.g. ocular inserts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F9/00Methods 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
    • A61F9/007Methods or devices for eye surgery
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/0012Galenical forms characterised by the site of application
    • A61K9/0048Eye, e.g. artificial tears
    • A61K9/0051Ocular inserts, ocular implants
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M27/00Drainage appliances for wounds or the like, i.e. wound drains, implanted drains
    • A61M27/002Implant devices for drainage of body fluids from one part of the body to another
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F9/00Methods 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
    • A61F9/007Methods or devices for eye surgery
    • A61F9/008Methods or devices for eye surgery using laser
    • A61F2009/00885Methods or devices for eye surgery using laser for treating a particular disease
    • A61F2009/00891Glaucoma
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0067Means for introducing or releasing pharmaceutical products into the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2210/00Anatomical parts of the body
    • A61M2210/06Head
    • A61M2210/0612Eyes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S623/00Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
    • Y10S623/902Method of implanting
    • Y10S623/905Eye

Abstract

A glaucoma treatment device for directing the flow of aqueous humor and bypassing trabecular meshwork is disclosed. The device comprises an inlet section, an outlet section, a middle section, and at least one lumen for transmitting aqueous humor within the glaucoma device. The lumen extends through at least one of the sections, and the outlet section is substantially perpendicular to the middle section and fits within a conduit of aqueous humor outflow in the eye.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application is a continuation-in-part of U.S. application Ser. No. 09/704,276, filed Nov. 1, 2000, which is a continuation-in-part of U.S. patent application Ser. No. 9/549,350, filed Apr. 14, 2000, and entitled “Apparatus and Method for Treating Glaucoma,” the entire contents of which are incorporated herein by reference.[0001]
  • BACKGROUND OF THE INVENTION
  • The present invention generally relates to medical devices and methods for reducing intraocular pressure in the animal eye. More particularly, the present invention relates to the treatment of glaucoma by permitting aqueous humor to flow out of the anterior chamber through a surgically implanted pathway. [0002]
  • The human eye is a specialized sensory organ capable of light reception and able to receive visual images. The trabecular meshwork serves as a drainage channel and is located in anterior chamber angle formed between the iris and the cornea. The trabecular meshwork maintains a balanced pressure in the anterior chamber of the eye by draining aqueous humor from the anterior chamber. [0003]
  • About two percent of people in the United States have glaucoma. Glaucoma is a group of eye diseases encompassing a broad spectrum of clinical presentations, etiologies, and treatment modalities. Glaucoma causes pathological changes in the optic nerve, visible on the optic disk, and it causes corresponding visual field loss, resulting in blindness if untreated. Lowering intraocular pressure is the major treatment goal in all glaucomas. [0004]
  • In glaucomas associated with an elevation in eye pressure (intraocular hypertension), the source of resistance to outflow is mainly in the trabecular meshwork. The tissue of the trabecular meshwork allows the aqueous humor (“aqueous”) to enter Schlemm's canal, which then empties into aqueous collector channels in the posterior wall of Schlemm's canal and then into aqueous veins, which form the episcleral venous system. Aqueous humor is a transparent liquid that fills the region between the cornea, at the front of the eye, and the lens. The aqueous humor is continuously secreted by the ciliary body around the lens, so there is a constant flow of aqueous humor from the ciliary body to the eye's front chamber. The eye's pressure is determined by a balance between the production of aqueous and its exit through the trabecular meshwork (major route) or uveal scleral outflow (minor route). The trabecular meshwork is located between the outer rim of the iris and the back of the cornea, in the anterior chamber angle. The portion of the trabecular meshwork adjacent to Schlemm's canal (the juxtacanilicular meshwork) causes most of the resistance to aqueous outflow. [0005]
  • Glaucoma is grossly classified into two categories: closed-angle glaucoma, also known as angle closure glaucoma, and open-angle glaucoma. Closed-angle glaucoma is caused by closure of the anterior chamber angle by contact between the iris and the inner surface of the trabecular meshwork. Closure of this anatomical angle prevents normal drainage of aqueous humor from the anterior chamber of the eye. Open-angle glaucoma is any glaucoma in which the angle of the anterior chamber remains open, but the exit of aqueous through the trabecular meshwork is diminished. The exact cause for diminished filtration is unknown for most cases of open-angle glaucoma. Primary open-angle glaucoma is the most common of the glaucomas, and it is often asymptomatic in the early to moderately advanced stage. Patients may suffer substantial, irreversible vision loss prior to diagnosis and treatment. However, there are secondary open-angle glaucomas which may include edema or swelling of the trabecular spaces (e.g., from corticosteroid use), abnormal pigment dispersion, or diseases such as hyperthyroidism that produce vascular congestion. [0006]
  • All current therapies for glaucoma are directed at decreasing intraocular pressure. Medical therapy includes topical ophthalmic drops or oral medications that reduce the production or increase the outflow of aqueous. However, these drug therapies for glaucoma are sometimes associated with significant side effects, such as headache, blurred vision, allergic reactions, death from cardiopulmonary complications, and potential interactions with other drugs. When drug therapy fails, surgical therapy is used. Surgical therapy for open-angle glaucoma consists of laser trabeculoplasty, trabeculectomy, and implantation of aqueous shunts after failure of trabeculectomy or if trabeculectomy is unlikely to succeed. Trabeculectomy is a major surgery that is widely used and is augmented with topically applied anticancer drugs, such as 5-flurouracil or mitomycin-C to decrease scarring and increase the likelihood of surgical success. [0007]
  • Approximately 100,000 trabeculectomies are performed on Medicare-age patients per year in the United States. This number would likely increase if the morbidity associated with trabeculectomy could be decreased. The current morbidity associated with trabeculectomy consists of failure (10-15%); infection (a life long risk of 2-5%); choroidal hemorrhage, a severe internal hemorrhage from low intraocular pressure, resulting in visual loss (1%); cataract formation; and hypotony maculopathy (potentially reversible visual loss from low intraocular pressure). [0008]
  • For these reasons, surgeons have tried for decades to develop a workable surgery for the trabecular meshwork. [0009]
  • The surgical techniques that have been tried and practiced are goniotomy/trabeculotomy and other mechanical disruptions of the trabecular meshwork, such as trabeculopuncture, goniophotoablation, laser trabecular ablation, and goniocurretage. These are all major operations and are briefly described below. [0010]
  • Goniotomy/Trabeculotomy: Goniotomy and trabeculotomy are simple and directed techniques of microsurgical dissection with mechanical disruption of the trabecular meshwork. These initially had early favorable responses in the treatment of open-angle glaucoma. However, long-term review of surgical results showed only limited success in adults. In retrospect, these procedures probably failed due to cellular repair and fibrosis mechanisms and a process of “filling in.” Filling in is a detrimental effect of collapsing and closing in of the created opening in the trabecular meshwork. Once the created openings close, the pressure builds back up and the surgery fails. [0011]
  • Trabeculopuncture: Q-switched Neodymiun (Nd) YAG lasers also have been investigated as an optically invasive technique for creating full-thickness holes in trabecular meshwork. However, the relatively small hole created by this trabeculopuncture technique exhibits a filling-in effect and fails. [0012]
  • Goniophotoablation/Laser Trabecular Ablation: Goniophotoablation is disclosed by Berlin in U.S. Pat. No. 4,846,172 and involves the use of an excimer laser to treat glaucoma by ablating the trabecular meshwork. This was demonstrated not to succeed by clinical trial. Hill et al. used an Erbium:YAG laser to create full-thickness holes through trabecular meshwork (Hill et al., Lasers in Surgery and Medicine 11:341-346, 1991). This technique was investigated in a primate model and a limited human clinical trial at the University of California, Irvine. Although morbidity was zero in both trials, success rates did not warrant further human trials. Failure was again from filling in of surgically created defects in the trabecular meshwork by repair mechanisms. Neither of these is a viable surgical technique for the treatment of glaucoma. [0013]
  • Goniocurretage: This is an ab interno (from the inside), mechanically disruptive technique that uses an instrument similar to a cyclodialysis spatula with a microcurrette at the tip. Initial results were similar to trabeculotomy: it failed due to repair mechanisms and a process of filling in. [0014]
  • Although trabeculectomy is the most commonly performed filtering surgery, viscocanulostomy (VC) and non-penetrating trabeculectomy (NPT) are two new variations of filtering surgery. These are ab externo (from the outside), major ocular procedures in which Schlemm's canal is surgically exposed by making a large and very deep scleral flap. In the VC procedure, Schlemm's canal is cannulated and viscoelastic substance injected (which dilates Schlemm's canal and the aqueous collector channels). In the NPT procedure, the inner wall of Schlemm's canal is stripped off after surgically exposing the canal. [0015]
  • Trabeculectomy, VC, and NPT involve the formation of an opening or hole under the conjunctiva and scleral flap into the anterior chamber, such that aqueous humor is drained onto the surface of the eye or into the tissues located within the lateral wall of the eye. These surgical operations are major procedures with significant ocular morbidity. When trabeculectomy, VC, and NPT are thought to have a low chance for success, a number of implantable drainage devices have been used to ensure that the desired filtration and outflow of aqueous humor through the surgical opening will continue. The risk of placing a glaucoma drainage device also includes hemorrhage, infection, and diplopia (double vision). [0016]
  • Examples of implantable shunts and surgical methods for maintaining an opening for the release of aqueous humor from the anterior chamber of the eye to the sclera or space beneath the conjunctiva have been disclosed in, for example, U.S. Pat. No. 6,059,772 to Hsia et al., and No. 6,050,970 to Baerveldt. [0017]
  • All of the above embodiments and variations thereof have numerous disadvantages and moderate success rates. They involve substantial trauma to the eye and require great surgical skill in creating a hole through the full thickness of the sclera into the subconjunctival space. The procedures are generally performed in an operating room and have a prolonged recovery time for vision. [0018]
  • The complications of existing filtration surgery have inspired ophthalmic surgeons to find other approaches to lowering intraocular pressure. [0019]
  • The trabecular meshwork and juxtacanilicular tissue together provide the majority of resistance to the outflow of aqueous and, as such, are logical targets for surgical removal in the treatment of open-angle glaucoma. In addition, minimal amounts of tissue are altered and existing physiologic outflow pathways are utilized. [0020]
  • As reported in Arch. Ophthalm. (2000) 118:412, glaucoma remains a leading cause of blindness, and filtration surgery remains an effective, important option in controlling the disease. However, modifying existing filtering surgery techniques in any profound way to increase their effectiveness appears to have reached a dead end. The article further states that the time has come to boldly examine new surgical approaches that may provide better and safer care for patients with glaucoma. [0021]
  • Therefore, there is a great clinical need for the treatment of glaucoma by a method that is faster, safer, and less expensive than currently available modalities. [0022]
  • SUMMARY OF THE INVENTION
  • Glaucoma surgical morbidity would greatly decrease if one were to bypass the focal resistance to outflow of aqueous only at the point of resistance, and to utilize remaining, healthy aqueous outflow mechanisms. This is in part because episcleral aqueous humor exerts a backpressure that prevents intraocular pressure from going too low, and one could thereby avoid hypotony. Thus, such a surgery would virtually eliminate the risk of hypotony-related maculopathy and choroidal hemorrhage. Furthermore, visual recovery would be very rapid, and the risk of infection would be very small (a reduction from 2-5% to about 0.05%). [0023]
  • Techniques performed in accordance with the present invention may be referred to generally as “trabecular bypass surgery.” Advantages of the present invention include lowering intraocular pressure in a manner which is simple, effective, disease site-specific, and can potentially be performed on an outpatient basis. [0024]
  • In accordance with one aspect of the invention, trabecular bypass surgery (TBS) creates an opening, a slit, or a hole through trabecular meshwork with minor microsurgery. TBS has the advantage of a much lower risk of choroidal hemorrhage and infection than prior techniques, and it uses existing physiologic outflow mechanisms. In some aspects, this surgery can potentially be performed under topical or local anesthesia on an outpatient basis with rapid visual recovery. To prevent “filling in” of the hole, a biocompatible elongated device is placed within the hole, serving as a stent. [0025]
  • In some embodiments, the device may be positioned across trabecular meshwork alone, without extending into the eye wall or sclera. The inlet end of the device is exposed to the anterior chamber of the eye while the outlet end is positioned at the exterior surface of the trabecular meshwork. In another embodiment, the outlet end is positioned at the exterior surface of the trabecular meshwork and into the fluid collection channels of the existing outflow pathways. In still another embodiment, the outlet end is positioned in Schlemm's canal. In an alternative embodiment, the outlet end enters into fluid collection channels (e.g., aqueous collector channels) up to the level of the aqueous veins, with the device inserted in a retrograde or antegrade fashion. [0026]
  • In some embodiments, the device is made of biocompatible material, which is either hollow, to allow the flow of aqueous humor, or solid, porous material that imbibes aqueous humor. One or more materials for the device may be selected from the following material types: porous material, semi-rigid material, soft material, hydrophilic material, hydrophobic material, hydrogel, elastic material, biodegradable material, and the like. [0027]
  • One or more materials for the glaucoma device may be selected from the following: polyvinyl alcohol, polyvinyl pyrolidone, collagen, heparinized collagen, polytetrafluoroethylene, expanded polytetrafluoroethylene, fluorinated polymer, fluorinated elastomer, flexible fused silica, polyolefin, polyester, polyimide, polysilison, silicone, polyurethane, Nylon, polypropylene, hydroxyapetite, titanium, and precious metal (e.g., gold, silver, or platinum). Other suitable filter types and materials for the device may be used in accordance with the invention and will be apparent to those of skill in the art. [0028]
  • In accordance with a further aspect of the invention, the device is relatively soft and somewhat curved at its outlet section to fit into the existing outflow pathways, such as Schlemm's canal. The outlet section may be curved around a curve center, and the middle section may extend substantially along a plane that contains the curve center. All or a portion of the cross section of one or more lumens may be in an elliptical (e.g., oval) shape. Furthermore, the outlet section inside the outflow pathway may have an appropriate shape, e.g., with a protuberance or barb projecting from it, to stabilize the device in place without undue suturing. [0029]
  • One aspect of the invention includes a method of placing a glaucoma device into an opening through trabecular meshwork and into an outflow pathway for aqueous humor. This glaucoma device includes an inlet section, an outlet section, and a middle section between the inlet section and the outlet section. The glaucoma device also includes at least one lumen that extends within at least one of the three sections for transmitting aqueous humor, and the outlet section is substantially perpendicular to the middle section. The outlet section includes a first outlet end and a second outlet end. In this aspect of the invention, the method includes advancing the first outlet end of the outlet section through the opening into a first part of the outflow pathway, and advancing the second outlet end of the outlet section through the opening into a second part of the outflow pathway. [0030]
  • The outlet section is, in one embodiment, an elongated element having a first outlet end and a second outlet end, wherein the middle section is connected to the outlet section between the first outlet end and the second outlet end. Stabilization or retention of the device in the eye may be further strengthened by inserting the first outlet end into a first side of Schlemm's canal, then inserting the second outlet end into a second, opposite side of Schlemm's canal. The angle between the long axis of the inlet section and the long axis of the middle section is advantageously between about 20 degrees and about 150 degrees, and preferably between about 30 degrees and about 60 degrees. This angle adapts the device for positioning the inlet section inside the anterior chamber of an eye. [0031]
  • In one embodiment, the device of the invention may include a flow-restricting member for restricting at least one component in fluid. The flow-restricting member may be a filter comprising one or more filtration materials selected from the following: expanded polytetrafluoroethylene, cellulose, ceramic, glass, Nylon, plastic, fluorinated material, or the like. The flow-restricting member may advantageously be a filter selected from the following group of filter types: hydrophobic, hydrophilic, membrane, microporous, and non-woven. The flow-restricting member acts to limit or prevent the reflux of any undesired component or contaminant of blood, such as red blood cells or serum protein, from the aqueous veins into the anterior chamber. It is useful to restrict one or more of the following component or contaminants: platelets, red blood cells, white blood cells, viruses, bacteria, antigens, and toxins. [0032]
  • In an alternate embodiment, the method may further include inserting a guidewire into the first part of the outflow pathway, wherein the step of advancing the first outlet end of the outlet section includes advancing the glaucoma device along the guidewire. [0033]
  • Among the advantages of trabecular bypass surgery in accordance with the invention is its simplicity. The microsurgery may potentially be performed on an outpatient basis with rapid visual recovery and greatly decreased morbidity. There is a lower risk of infection and choroidal hemorrhage, and there is a faster recovery, than with previous techniques. [0034]
  • Further features and advantages of the present invention will become apparent to one of skill in the art in view of the Detailed Description that follows, when considered together with the attached drawings and claims.[0035]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a sagittal sectional view of an eye. [0036]
  • FIG. 2 is a cross-sectional view of the anterior chamber of an eye. [0037]
  • FIG. 3 is an oblique elevational view of a glaucoma device according to the present invention. [0038]
  • FIG. 4 is an oblique elevational view of the glaucoma device, featuring an open trough configuration. [0039]
  • FIG. 5A illustrates placement of one end of the glaucoma device through trabecular meshwork in accordance with the present invention. [0040]
  • FIG. 5B illustrates an alternate method of placement of one end of the glaucoma device through trabecular meshwork, over a guidewire. [0041]
  • FIG. 6 illustrates completed placement of the glaucoma device through trabecular meshwork. [0042]
  • FIG. 7 illustrates a method of placement of the glaucoma device in an eye in accordance with the present invention. [0043]
  • FIG. 8 is a perspective view of the anterior chamber of an eye, illustrating the glaucoma device of the present invention positioned within the trabecular meshwork. [0044]
  • FIG. 9 is a close-up view of the inlet section of the glaucoma device in accordance with the present invention, illustrating a flow-restricting member inside the lumen of the inlet section.[0045]
  • DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
  • FIGS. [0046] 1 to 9 illustrate an apparatus for the treatment of glaucoma by trabecular bypass surgery in accordance with the present invention.
  • FIG. 1 is a sagittal sectional view of an eye [0047] 10, while FIG. 2 shows a close-up view, showing the relative anatomical locations of trabecular meshwork 21, the anterior chamber 20, and Schlemm's canal 22. Thick collagenous tissue known as sclera 11 covers the entire eye 10 except that portion covered by the cornea 12. The cornea 12 is a thin transparent tissue that focuses and transmits light into the eye and through the pupil 14, which is the circular hole in the center of the iris 13 (colored portion of the eye). The cornea 12 merges into the sclera 11 at a juncture referred to as the limbus 15. The ciliary body 16 extends along the interior of the sclera 11 and is coextensive with the choroid 17. The choroid 17 is a vascular layer of the eye 10, located between the sclera 11 and retina 18. The optic nerve 19 transmits visual information to the brain and is the anatomic structure that is progressively destroyed by glaucoma.
  • The anterior chamber [0048] 20 of the eye 10, which is bound anteriorly by the cornea 12 and posteriorly by the iris 13 and lens 26, is filled with aqueous humor (“aqueous”). Aqueous is produced primarily by the ciliary body 16, then moves anteriorly through the pupil 14 and reaches the anterior chamber angle 25, formed between the iris 13 and the cornea 12. In a normal eye, the aqueous is removed from the anterior chamber 20 through the trabecular meshwork 21. Aqueous passes through trabecular meshwork 21 into Schlemm's canal 22 and thereafter through the aqueous veins 23, which merge with blood-carrying veins and into systemic venous circulation. Intraocular pressure is maintained by the intricate balance between secretion and outflow of the aqueous in the manner described above. Glaucoma is, in most cases, characterized by the excessive buildup of aqueous humor in the anterior chamber 20, which leads to an increase in intraocular pressure. Fluids are relatively incompressible, and pressure is directed relatively equally throughout the eye.
  • As shown in FIG. 2, the trabecular meshwork [0049] 21 is adjacent a small portion of the sclera 11. Traditional procedures that create a hole or opening for implanting a device through the tissues of the conjunctiva 24 and sclera 11 involve extensive surgery, as compared to surgery for implanting a device which ultimately resides entirely within the confines of the sclera 11 and cornea 12, as is performed in accordance with one aspect of the present invention. A device 31 for establishing an outflow pathway, positioned through the trabecular meshwork 21, is illustrated in FIG. 8.
  • One aspect of the invention includes a method for increasing aqueous humor outflow in an eye of a patient, to reduce the intraocular pressure therein. The method comprises bypassing the trabecular meshwork [0050] 21. The device 31 may be elongate or of other appropriate shape, size, or configuration, as will be evident to those of skill in the art. In one embodiment, illustrated in FIG. 3, the device has an inlet section, a middle section 4, and an outlet section 9. There is also at least one lumen inside at least one of the sections for transmitting aqueous humor. The inlet section is typically positioned at an anterior chamber 20 of the eye and the outlet section 9 is preferably positioned at about an exterior surface of the trabecular meshwork 21. The outlet section 9 is, in some embodiments, substantially perpendicular to the middle section 4 a. “Substantially perpendicular,” as used herein, is defined as subtending an angle between the long axes of the sections (e.g., the outlet section 9 and middle section 4) of between about 30 degrees and about 150 degrees.
  • The middle section [0051] 4A is advantageously placed across the trabecular meshwork 21 through a slit or opening. This opening can be created by laser, a knife, or other surgical cutting instrument. The opening may advantageously be substantially horizontal, i.e., extending longitudinally in the same direction as the circumference of the limbus 15. Other opening directions may also be used, such as horizontal or at any angle that is appropriate for inserting the glaucoma device through the trabecular meshwork 21 and into Schlemm's canal or another outflow pathway, as will be apparent to those of skill in the art. The middle section 4A may be semi-flexible and/or adjustable in position relative to the inlet section 2 and/or outlet section 9, further adapting the device for simple and safe glaucoma implantation. Furthermore, the outlet section 9 may be positioned into fluid collection channels of the natural outflow pathways. Such natural outflow pathways include Schlemm's canal 22, aqueous collector channels, aqueous veins, and episcleral veins. The outlet section 9 may be positioned into fluid collection channels up to at least the level of the aqueous veins, with the device inserted in a retrograde or antegrade fashion.
  • A further aspect of the invention includes methods for increasing aqueous humor outflow in an eye of a patient to reduce an intraocular pressure therein. The method comprises the following: (a) creating an opening in the trabecular meshwork [0052] 21, wherein the trabecular meshwork 21 includes a deep side and superficial side; (b) inserting a glaucoma device into the opening; and (c) transmitting aqueous humor through the device, to bypass the trabecular meshwork 21, from the deep side to the superficial side of the trabecular meshwork 21. This “transmitting” of aqueous humor is, in one aspect of the invention, preferably passive, i.e., aqueous humor is allowed to flow out of the anterior chamber due to the pressure gradient between the anterior chamber and the aqueous venous system.
  • FIG. 3 shows an embodiment of the glaucoma device [0053] 31 according to the principles of the invention. The device may comprise a biocompatible material, such as medical grade silicone, e.g., Silastic™, available from Dow Corning Corporation of Midland, Mich.; or polyurethane, e.g., Pellethane™, also available from Dow Corning Corporation.
  • In an alternate embodiment, other biocompatible material (biomaterial) may be used, such as polyvinyl alcohol, polyvinyl pyrolidone, collagen, heparinized collagen, polytetrafluoroethylene, expanded polytetrafluoroethylene, fluorinated polymer, fluorinated elastomer, flexible fused silica, polyolefin, polyester, polysilison, mixture of biocompatible materials, and the like. In a further embodiment, a composite biocompatible material may be used, wherein a surface material may be used in addition to one or more of the aforementioned materials. Such a surface material may include polytetrafluoroethylene (“PTFE”) (such as Teflon™), polyimide, hydrogel, heparin, therapeutic drugs (such as beta-adrenergic antagonists and other anti-glaucoma drugs, or antibiotics), and the like. [0054]
  • The device facilitates the outflow of aqueous from the anterior chamber [0055] 20 into Schlemm's canal 22, and subsequently into the aqueous collectors and the aqueous veins so that the intraocular pressure is reduced. In one embodiment, as shown in FIG. 3, the device 31 comprises an inlet section 2, a middle section 4, and an outlet section 9. The middle section 4 may be an extension of, or may be coextensive with, the inner section. The device 31 further comprises at least one lumen within, one, two, or all three sections 2, 4, 9 for transmitting aqueous humor from the inlet opening 3.
  • In some embodiments, a curved and/or flexible outlet section [0056] 9 is positioned inside one of the natural outflow pathways. The outlet section 9 may have a first outlet end 6 and a second, opposite outlet end 5. The outlet section 9 may further have at least one vent or opening 7 at one outlet end of the outlet section 9, and/or a plurality of side openings 77, for transmitting aqueous humor. The middle section 4 is connected to or coextensive with the outlet section 9 between the first outlet end 6 and the second outlet end 5. In a preferred arrangement, the outlet section 9 is curved around a point, or curve center, and the middle section extends substantially along a plane that contains the curve center. In one embodiment, the radius of the curve of the outlet section 9 is between about 4 mm and about 10 mm.
  • The device is preferably biocompatible so that any inflammation caused by irritation between the outer surface of the device and surrounding tissue is minimal. All or a portion of the cross-section of one or more lumens may be in an elliptical (e.g., oval) shape. Furthermore, the outlet section inside the outflow pathway may have an appropriate shape, e.g., with a protuberance or barb projecting from it, to stabilize the device in place without undue suturing. [0057]
  • In some embodiments, the radius of the curve of the outlet section [0058] 9 is between about 4 mm and 10 mm.
  • An optional ridge or flange [0059] 8 at the junction of the inlet section 2 and the middle section 4 may be provided for device stabilization purposes. The appropriate length of the middle section 2 that is adjacent to the ridge 8 and the outlet section 9 is, in one embodiment, preferably close in thickness to the trabecular meshwork 21, which is approximately between about 100 microns and about 300 microns thick.
  • The shape of the opening [0060] 7 of the outlet section 6 and the remaining body of the outlet section 9 may be oval, round, or other appropriate shape. The shape in some embodiments preferably conforms to the shape of the outflow pathway into which the outlet section 9 is placed. The opening 7 of the outlet end may be ovoid in shape to match the contour of Schlemm's canal 22. Further, an outer contour of the outlet section 9 may be elliptical (e.g., ovoid) in shape to match the contour of Schlemm's canal 22. This minimizes rotational movement of the outlet section 6 within Schlemm's canal 22, and thereby stabilizes the inlet section 2 with respect to the iris and cornea.
  • FIG. 4 shows another embodiment of the glaucoma device according to principles of the present invention. The device [0061] 31A comprises an inlet section 2A, a middle section 4A, and an outlet section 9A. The device further comprises at least one lumen inside the glaucoma device 31 A throughout one or more of the three sections 2A, 4A, 9A for transmitting aqueous humor starting from the inlet opening 3A. A curved and/or flexible outlet section 9A is used for positioning the outlet section 9A inside one of the existing outflow pathways. The outlet section 9A may comprise an elongated trough 7A or groove for transmitting, or venting, aqueous humor. The elongated trough is connected to and in communication with the at least one lumen inside the glaucoma device as shown in FIG. 4. An optional ridge 8A at the junction of the inlet section 2A and the middle section 4A is provided for stabilization purposes.
  • As shown in FIGS. 3 and 4, the device of the present invention may have a length between about 0.5 mm to over ten centimeters, depending on the distance between the anterior chamber and drainage vessel (e.g., a vein) into which the device drains aqueous humor. The outside diameter of the device may range from about 30 μm to about 500 μm. The diameter of the device lumen is advantageously in the range of about 20 μm to about 250 μm. The device may have a plurality of lumens to facilitate transmission of multiple flows of aqueous humor. The long axis of the inlet section [0062] 2, 2A may be at an angle (θ) between about 20 degrees and about 150 degrees, preferably between about 30 and about 60 degrees, with respect to the long axis of the middle section 4, 4A.
  • The glaucoma device of the present invention, which may also be called a trabecular shunt, may be made by molding, thermo-forming, or other micro-machining techniques. Biomaterial suitable for the manufacturing the device may include polyvinyl alcohol, polyvinyl pyrolidone, collagen, heparinized collagen, polytetrafluoroethylene, expanded polytetrafluoroethylene, fluorinated polymer, fluorinated elastomer, flexible fused silica, polyolefin, polyester, polysilison, and/or a mixture of the above biocompatible materials. [0063]
  • FIG. 5A illustrates a step in deploying the glaucoma device through the trabecular meshwork [0064] 21. The outlet section 9 of the device 31 is, in one aspect of the invention, inserted into an opening 61 in the trabecular meshwork 21. The slit or opening 61 may be created ab interno from the interior surface 65 of the trabecular meshwork 21. The surgeon then advances the first outlet end 6 of the outlet section 9 through the opening 61 into a first side of Schlemm's canal or other suitable outflow pathway. The surgeon then advances the second outlet end 5 of the outlet section 9 through the opening 61 and into a second side of Schlemm's canal. This may be facilitated by slightly pushing the second outlet end 5 through the opening 61. FIG. 6 illustrates a further stage in deployment of the device, wherein the whole outlet section 9 of the device 31 is inside the outflow pathway (e.g., Schlemm's canal), beneath the trabecular meshwork 21. An enhanced fluid communication through the trabecular meshwork 21 at this stage is through the lumen of the implanted device 31.
  • FIG. 5B, shows an additional and/or alternate step of deploying the glaucoma device. The surgeon can insert a distal end [0065] 63 of a guidewire 64 through the opening 61 into the first side Schlemm's canal, or other outflow pathway, to guide the device 31 into position during the device implantation. The step of advancing the first outlet end 6 of the outlet section 9 into Schlemm's canal is accomplished, in this embodiment, by “riding,” or advancing, the glaucoma device 31 on the guidewire 64. A cross-section of the guidewire may advantageously be selected from any of the following: an elliptical (e.g., oval) shape, D-shape, round shape, and irregular (asymmetric) shape adapted for nonrotatory engagement for the device.
  • FIG. 7 shows an aspect of placing the glaucoma device at the implantation site. An irrigating knife or applicator [0066] 51 is provided, which, in some embodiments, comprises a syringe portion 54 and a cannula portion 55. The distal section of the cannula portion 55 has at least one irrigating hole 53 and a distal space 56 for holding the device 31. The proximal end 57 of the lumen of the distal space 56 is, in one embodiment, sealed off from, and thus substantially not in communication with, the remaining lumen of the cannula portion 55. In this embodiment, the device is placed on the delivery applicator and advanced to the device site, wherein the delivery applicator holds the device securely during delivery and releases it when the surgeon chooses to deploy the device.
  • In some embodiments of trabecular meshwork surgery in accordance with the invention, the patient is placed in the supine position, prepped, draped, and anesthetized as necessary. In one embodiment, a small (less than 1-mm incision, which may be self-sealing, is made through the cornea. Through this incision, the trabecular meshwork [0067] 21 is accessed, and an incision is made in the trabecular meshwork 21 with an irrigating knife. The device 31 is then advanced through the corneal incision 52 across the anterior chamber 20, while the device is held in an irrigating applicator 51, under gonioscopic, microscopic, or endoscopic guidance. After the device is implanted in place, the applicator is withdrawn and the surgery concluded. The irrigating knife may be within a size range of about 16 to about 40 gauge, and, in some embodiments, preferably about 30 gauge.
  • FIG. 8 illustrates the device [0068] 31 positioned within the tissue of an eye 10. An opening is present in the trabecular meshwork 21. The outlet section 9 of the device 31 has been inserted into the opening. The inlet section 2 is exposed to the anterior chamber 20, while the outlet section 9 is positioned near an interior surface 43 of the trabecular meshwork 21. In a further embodiment, the outlet section 9 may further be placed into fluid collection channels, as described above. A device as shown in FIG. 4, wherein the outflow section has an open trough for stenting purposes, may be used to maintain the opening of one or more of these outflow pathways,
  • In one embodiment, the method of forming an opening in the trabecular meshwork [0069] 21 may comprise making an incision with a microknife, a pointed guidewire, a sharpened applicator, a screw-shaped applicator, an irrigating applicator, or a barbed applicator. Alternatively, the trabecular meshwork 21 may be dissected with an instrument similar to a retinal pick or microcurrette. The opening may alternately be created by fiberoptic laser ablation.
  • FIG. 9 is a close-up view of the inlet section [0070] 2 of the glaucoma device 31, having a flow-restricting member 72 inside a lumen 78 of the glaucoma device. The flow-restricting member 72 is shown located close to the inlet side 71 of the inlet section 2. Alternatively, the flow-restricting member may be situated in any location in the device that will cause the flow of blood to be restricted from moving retrograde, i.e., from the outlet section 9 to the anterior chamber 20 of the eye. The flow-restricting member is used to selectively restrict at least one component in blood from backflowing into the anterior chamber 20. The flow-restricting member may, in some embodiments, be a filter made of a type of material selected from the following filter materials: expanded polytetrafluoroethylene, cellulose, ceramic, glass, Nylon, plastic, and fluorinated material such as polyvinylidene fluoride (“PVDF”) (trade name: Kynar, by DuPont). Advantageously, the flow-restricting member 72 tightly occupies a section of the flow lumen 78 of the at least one lumen between the inlet section 2 and the outlet section 9.
  • From the foregoing description, it will be appreciated that a novel approach for the surgical treatment of glaucoma has been disclosed. While aspects of the invention have been described with reference to specific embodiments, the description is illustrative and is not intended to limit the scope of the invention. Various modifications and applications of the invention may occur to those who are skilled in the art, without departing from the true spirit or scope of the invention. The breadth and scope of the invention should be defined only in accordance with the appended claims and their equivalents. [0071]

Claims (1)

    What is claimed is:
  1. 1. A glaucoma treatment device for directing the flow of aqueous humor and bypassing trabecular meshwork in an eye, the device comprising:
    an inlet section;
    an outlet section;
    a middle section located between the inlet section and the outlet section; and
    at least two lumens for transmitting aqueous humor within the glaucoma device, said lumen extending through at least one of said sections;
    wherein the outlet section is substantially perpendicular to the middle section and fits within a conduit of aqueous humor outflow in the eye.
US10824052 2000-04-14 2004-04-14 Glaucoma treatment device Abandoned US20040254519A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US09549350 US6638239B1 (en) 2000-04-14 2000-04-14 Apparatus and method for treating glaucoma
US09704276 US6736791B1 (en) 2000-04-14 2000-11-01 Glaucoma treatment device
US10824052 US20040254519A1 (en) 2000-04-14 2004-04-14 Glaucoma treatment device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10824052 US20040254519A1 (en) 2000-04-14 2004-04-14 Glaucoma treatment device
US11836109 US20070282244A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with anchor

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US09704276 Continuation US6736791B1 (en) 2000-04-14 2000-11-01 Glaucoma treatment device

Related Child Applications (1)

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US11836109 Continuation US20070282244A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with anchor

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US20040254519A1 true true US20040254519A1 (en) 2004-12-16

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US09549350 Active US6638239B1 (en) 2000-04-14 2000-04-14 Apparatus and method for treating glaucoma
US09704276 Active 2021-01-07 US6736791B1 (en) 2000-04-14 2000-11-01 Glaucoma treatment device
US10309711 Active 2020-12-01 US6955656B2 (en) 2000-04-14 2002-12-04 Apparatus and method for treating glaucoma
US10395472 Abandoned US20030187384A1 (en) 2000-04-14 2003-03-21 Implant with a micropump
US10395633 Abandoned US20030181848A1 (en) 2000-04-14 2003-03-21 Implant with drug coating
US10395627 Active US6780164B2 (en) 2000-04-14 2003-03-21 L-shaped implant with bi-directional flow
US10395631 Active 2021-11-13 US7297130B2 (en) 2000-04-14 2003-03-21 Implant with anchor
US10782382 Abandoned US20040210185A1 (en) 2000-04-14 2004-02-19 Glaucoma implant kit
US10824052 Abandoned US20040254519A1 (en) 2000-04-14 2004-04-14 Glaucoma treatment device
US10889254 Active US8273050B2 (en) 2000-04-14 2004-07-12 Ocular implant with anchor and therapeutic agent
US11123443 Abandoned US20050209549A1 (en) 2000-04-14 2005-05-06 Glaucoma implant with multiple openings
US11124440 Active 2021-11-03 US7867205B2 (en) 2000-04-14 2005-05-06 Method of delivering an implant for treating an ocular disorder
US11295066 Abandoned US20060074375A1 (en) 2000-04-14 2005-12-06 Shunt device and method for treating glaucoma
US11294794 Abandoned US20060084907A1 (en) 2000-04-14 2005-12-06 Shunt device and method for treating glaucoma
US11412454 Abandoned US20060195056A1 (en) 2000-04-14 2006-04-27 Shunt device and method for treating glaucoma
US11412581 Abandoned US20060195055A1 (en) 2000-04-14 2006-04-27 Shunt device and method for treating glaucoma
US11836109 Abandoned US20070282244A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with anchor
US11836118 Abandoned US20070282245A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with valve
US11841967 Abandoned US20080045878A1 (en) 2000-04-14 2007-08-20 Therapeutic shunt device and method for treating glaucoma
US12366565 Active 2020-12-20 US8801648B2 (en) 2000-04-14 2009-02-05 Ocular implant with anchor and methods thereof
US12366242 Active 2020-12-01 US8808219B2 (en) 2000-04-14 2009-02-05 Implant delivery device and methods thereof for treatment of ocular disorders
US12437482 Active 2021-10-25 US8333742B2 (en) 2000-04-14 2009-05-07 Method of delivering an implant for treating an ocular disorder
US12914940 Active 2021-10-04 US9993368B2 (en) 2000-04-14 2010-10-28 System and method for treating an ocular disorder
US13623767 Active US8814820B2 (en) 2000-04-14 2012-09-20 Ocular implant with therapeutic agent and methods thereof

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US09549350 Active US6638239B1 (en) 2000-04-14 2000-04-14 Apparatus and method for treating glaucoma
US09704276 Active 2021-01-07 US6736791B1 (en) 2000-04-14 2000-11-01 Glaucoma treatment device
US10309711 Active 2020-12-01 US6955656B2 (en) 2000-04-14 2002-12-04 Apparatus and method for treating glaucoma
US10395472 Abandoned US20030187384A1 (en) 2000-04-14 2003-03-21 Implant with a micropump
US10395633 Abandoned US20030181848A1 (en) 2000-04-14 2003-03-21 Implant with drug coating
US10395627 Active US6780164B2 (en) 2000-04-14 2003-03-21 L-shaped implant with bi-directional flow
US10395631 Active 2021-11-13 US7297130B2 (en) 2000-04-14 2003-03-21 Implant with anchor
US10782382 Abandoned US20040210185A1 (en) 2000-04-14 2004-02-19 Glaucoma implant kit

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US10889254 Active US8273050B2 (en) 2000-04-14 2004-07-12 Ocular implant with anchor and therapeutic agent
US11123443 Abandoned US20050209549A1 (en) 2000-04-14 2005-05-06 Glaucoma implant with multiple openings
US11124440 Active 2021-11-03 US7867205B2 (en) 2000-04-14 2005-05-06 Method of delivering an implant for treating an ocular disorder
US11295066 Abandoned US20060074375A1 (en) 2000-04-14 2005-12-06 Shunt device and method for treating glaucoma
US11294794 Abandoned US20060084907A1 (en) 2000-04-14 2005-12-06 Shunt device and method for treating glaucoma
US11412454 Abandoned US20060195056A1 (en) 2000-04-14 2006-04-27 Shunt device and method for treating glaucoma
US11412581 Abandoned US20060195055A1 (en) 2000-04-14 2006-04-27 Shunt device and method for treating glaucoma
US11836109 Abandoned US20070282244A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with anchor
US11836118 Abandoned US20070282245A1 (en) 2000-04-14 2007-08-08 Glaucoma implant with valve
US11841967 Abandoned US20080045878A1 (en) 2000-04-14 2007-08-20 Therapeutic shunt device and method for treating glaucoma
US12366565 Active 2020-12-20 US8801648B2 (en) 2000-04-14 2009-02-05 Ocular implant with anchor and methods thereof
US12366242 Active 2020-12-01 US8808219B2 (en) 2000-04-14 2009-02-05 Implant delivery device and methods thereof for treatment of ocular disorders
US12437482 Active 2021-10-25 US8333742B2 (en) 2000-04-14 2009-05-07 Method of delivering an implant for treating an ocular disorder
US12914940 Active 2021-10-04 US9993368B2 (en) 2000-04-14 2010-10-28 System and method for treating an ocular disorder
US13623767 Active US8814820B2 (en) 2000-04-14 2012-09-20 Ocular implant with therapeutic agent and methods thereof

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JP (4) JP3985019B2 (en)
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