US20120271272A1 - Device for ocular access - Google Patents

Device for ocular access Download PDF

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Publication number
US20120271272A1
US20120271272A1 US13/273,775 US201113273775A US2012271272A1 US 20120271272 A1 US20120271272 A1 US 20120271272A1 US 201113273775 A US201113273775 A US 201113273775A US 2012271272 A1 US2012271272 A1 US 2012271272A1
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US
United States
Prior art keywords
eye
distal end
space
reservoir
tissue
Prior art date
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Abandoned
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US13/273,775
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English (en)
Inventor
Amy Lee HAMMACK
Stanley R. Conston
Ronald Yamamoto
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Clearside Biomedical Inc
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Iscience Interventional Corp
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Publication date
Application filed by Iscience Interventional Corp filed Critical Iscience Interventional Corp
Priority to US13/273,775 priority Critical patent/US20120271272A1/en
Assigned to ISCIENCE INTERVENTIONAL CORPORATION reassignment ISCIENCE INTERVENTIONAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMMACK, AMY LEE, CONSTON, STANLEY R., YAMAMOTO, RONALD
Publication of US20120271272A1 publication Critical patent/US20120271272A1/en
Priority to US14/821,310 priority patent/US20160193080A1/en
Assigned to ISCI HOLDINGS INC. reassignment ISCI HOLDINGS INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ISCIENCE INTERVENTIONAL CORPORATION
Assigned to CLEARSIDE BIOMEDICAL, INC. reassignment CLEARSIDE BIOMEDICAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISCI HOLDINGS INC. F/K/A/ ISCIENCE INTERVENTIONAL CORPORATION
Priority to US15/872,206 priority patent/US10952894B2/en
Assigned to SILICON VALLEY BANK reassignment SILICON VALLEY BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLEARSIDE BIOMEDICAL, INC.
Assigned to CLEARSIDE BIOMEDICAL, INC. reassignment CLEARSIDE BIOMEDICAL, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: SILICON VALLEY BANK
Priority to US17/208,235 priority patent/US20220062040A1/en
Priority to US17/523,168 priority patent/US12090088B2/en
Priority to US18/775,528 priority patent/US20250177201A1/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
    • A61F9/0008—Introducing ophthalmic products into the ocular cavity or retaining products therein
    • A61F9/0017—Introducing ophthalmic products into the ocular cavity or retaining products therein implantable in, or in contact with, the eye, e.g. ocular inserts
    • 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
    • A61F9/00727—Apparatus for retinal reattachment
    • 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
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/46—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for controlling depth of insertion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/48—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for varying, regulating, indicating or limiting injection pressure
    • A61M5/486—Indicating injection pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M2210/00—Anatomical parts of the body
    • A61M2210/06—Head
    • A61M2210/0612—Eyes

Definitions

  • the suprachoroidal space is a potential space in the eye that is located between the choroid, which is the middle layer or vascular tunic of the eye, and the sclera, the outer (white) layer of the eye.
  • the suprachoroidal space extends from the anterior portion of the eye near the ciliary body to the posterior end of the eye adjacent to the optic nerve. Normally the suprachoroidal space is not evident due to the close apposition of the choroid to the sclera from the intraocular pressure of the eye. Since there is no substantial attachment of the choroid to the sclera, the tissues can separate to form the suprachoroidal space when fluid accumulation or other conditions occur.
  • the suprachoroidal space provides a potential route of access from the anterior region of the eye to the posterior region for the delivery of treatments for diseases of the eye.
  • Standard surgical access to the suprachoroidal space is achieved through incisions in the conjunctiva and the sclera, and is primarily performed in an operating room.
  • Surgical access is useful in draining choroidal effusions or hemorrhage, and in placing microcatheters and cannulas into the suprachoroidal space for delivery of agents to the back of the eye.
  • Treatments for diseases such as age-related macular degeneration, macular edema, diabetic retinopathy and uveitis may be treated by the appropriate active agent administered in the suprachoroidal space.
  • the sub-retinal space is a potential space in the eye that is located between the sensory retina and the choroid.
  • the sub-retinal space lies under all portions of the retina, from the macular region near the posterior pole to the ora serrata, the anterior border of the retina. Normally the sub-retinal space is not evident as the retina needs to be apposed to the underlying choroid for normal health and function. In some disease states or as a result of trauma, a retinal detachment may occur, forming a fluid filled region in the sub-retinal space. Such spaces normally require treatment to reattach the retina before retinal function is irreversibly lost.
  • the sub-retinal space may be accessed ab-interno by piercing a small gauge needle through the retina. This procedure involves penetration of the intraocular space of the eye and forming a small retinotomy by the needle.
  • a therapeutic agent injected into the sub-retinal space may flow out through the retinotomy into the vitreous cavity causing exposure of the therapeutic to the lens, ciliary body and cornea as it exits through the anterior aqueous outflow pathway.
  • the present invention provides an apparatus to allow minimally invasive, transconjunctival access to the suprachoroidal space or sub-retinal space in the eye for the delivery of therapeutic or diagnostic materials.
  • the present invention provides a device comprising an elongated body having a distal end and proximal end, said ends in communication through an internal pathway within the body wherein:
  • the distal end is configured with a sharp edge or point to penetrate into ocular tissues of the outer shell of the eye, a moveable guarding element disposed in a first configuration to shield the ocular tissues from the sharp edge or point, and adapted to apply a distally directed force to the tissues at the distal end of the device to displace tissue away from the distal end of the device upon entry into the suprachoroidal space or subretinal space in an eye with the distal end; wherein the guarding element is moveable to a second configuration to expose said sharp edge or point to said tissues for penetration into the tissues, and an access port to deliver materials and substances through the pathway in the elongated body after deployment of the guarding element within the suprachoroidal space or subretinal space.
  • the guarding element is attached to a spring or compressible element that upon compression thereof provides a distally directed force on the guarding element.
  • the device further comprises a sealing element attached at the distal end of the elongated body adapted to reduce or prevent leakage of fluid or gas through a tissue tract created by the device.
  • the device accommodates a spring to apply a distal force on the sealing element to provide a sealing force of the element against the eye tissue.
  • the device comprises a reservoir at the proximal end for receiving a material to be delivered at the target space and the sealing element is in mechanical communication with an activating element for releasing the material from the reservoir.
  • the device comprises an associated sealing element adapted for retention on the surface of the eye to receive the distal end of the device to locate and stabilize the device during penetration into the eye.
  • the invention further provides a device for placement in the sclera of an eye, comprising a body having a proximal end adapted for location at or near the scleral surface and a distal end adapted for location within the suprachoroidal or subretinal space, where the device comprises a lumen and a mechanical stop at the proximal end for retaining the proximal end at or near the scleral surface.
  • Methods of using the devices of the invention to access the suprachoroidal or subretinal spaces of the eye are also provided.
  • FIG. 1 is a schematic cross-section of the eye with a detail view of the layers of the eye.
  • FIG. 2 is a schematic of a device according to one embodiment of the invention comprising an angled tip.
  • FIG. 4 is a schematic of a device according to one embodiment of the invention comprising a tubular guard element disposed about the outside of the main shaft.
  • FIG. 5 is a schematic of a device according to one embodiment of the invention comprising a reservoir element.
  • FIG. 6 is a schematic of a device according to one embodiment of the invention comprising a sealed reservoir activated by piercing said seal.
  • FIG. 7 is a schematic of a device according to one embodiment of the invention comprising a spring loaded distal element on a sliding shaft with a valve mechanism.
  • FIG. 8 is a schematic of a device according to one embodiment of the invention comprising a sliding distal element on a sliding shaft with a valve mechanism.
  • FIG. 9 is a schematic of a device according to one embodiment of the invention comprising a fixed shaft and a sliding outer element connected to a valve mechanism.
  • FIG. 10 is a schematic of a device according to one embodiment of the invention comprising a sealing element spring loaded about a main shaft.
  • FIG. 11 is a schematic of a device according to one embodiment of the invention comprising a separate sealing mechanism disposed upon the surface of the tissues and an injecting element inserted therethrough.
  • FIG. 12 is a schematic depiction of a device performing injections into the suprachoroidal and subretinal spaces.
  • FIG. 13 is a schematic of a device according to one embodiment of the invention comprising an access port on a trocar.
  • FIG. 14 is a schematic depiction of an access port placed in suprachoroidal space with a device.
  • FIG. 15 is a schematic depiction of a main shaft of a device according to the invention with a beveled tip and the tissue contacting surface of the device.
  • FIG. 16 is a graph of the results of the test described in Example 13.
  • the present invention provides methods and devices to access the suprachoroidal space or sub-retinal space in an eye via a minimally invasive transconjunctival approach to eliminate the need for dissection and subsequent suture closure of the dissection.
  • the devices may also be used after a partial dissection, for example after dissection of the outer scleral layer of the eye, whereby the device is used within the dissection to access the suprachoroidal space or the sub-retinal space.
  • the invention provides devices that advantageously may be used in an operating room- or treatment room based setting, to allow for the delivery of substances to the suprachoroidal space or sub-retinal space.
  • the device to deliver drugs or drug containing materials which provide sustained availability of the drug to the eye.
  • Drugs injected with the device to the suprachoroidal space are useful for treating the choroid and through the vasculature of the choroid, the inner tissues of the eye.
  • Drugs injected with the device to the sub-retinal space are useful for treating the retinal pigment epithelia and the sensory retina.
  • Some examples include polymer drug release materials in the form of injectable filaments or microspheres, or drugs with limited solubility that would provide slow release of drug to the eye.
  • Limited solubility steroids such as triamcinolone acetonide or loteprednol etabonate are steroids which may be injected into the suprachoroidal in a suspension formulation.
  • the devices comprise an elongated body with a distal and a proximal ends, where the device is held by the operator at the proximal end.
  • the distal end may be configured to penetrate the conjunctiva and the sclera, but not the choroid to access the suprachoroidal space.
  • the distal end may be configured to penetrate the conjunctiva, sclera, and the choroid but not the retina to access the sub-retinal space.
  • the device may contain substances to be delivered through the distal end once placed into the suprachoroidal or sub-retinal spaces.
  • the proximal end may be configured to receive apparatus for the delivery of substances such as a syringe.
  • the devices may also be adapted to place a thin-walled sleeve, as a port or introducer, into the suprachoroidal space or sub-retinal space to allow for subsequent placement and advancement of cannulae or catheters.
  • the device is adapted to limit penetration depth and/or to safely displace the choroid or retina away from the overlying tissue, thereby allowing the distal tip to penetrate into the suprachoroidal space or sub-retinal space, but preventing the distal tip from penetrating or causing damage to the choroid or retina itself.
  • Displacement-limiting or guarding elements may be provided through mechanical or fluidic mechanisms to provide a forward (distally) directed force to the tissues in the eye at the distal tip of the device.
  • the guarding elements may be self-activated by the device or manually activated by the surgeon at the appropriate time.
  • the device may incorporate a sealing element directed at the site of penetration of the eye to prevent leakage of the fluidic element that might cause undesired reduction of the degree of intended displacement of the underlying choroid or retina.
  • the eye 1 is a globe with two main sections, the anterior segment containing the cornea 2 , iris 3 , ciliary body 4 and lens 5 ; and the posterior segment containing the choroid 6 , retina 7 and vitreous 8 .
  • the outer shell of the eye is comprised of four main layers, said layers from outside to inside are: the conjunctiva, the thin, loosely adhered outer cover of the eye; the sclera 9 , the white collagenous tissue making up the major structural component of the eye; the choroid 6 , the vascular layer of the eye; and the retina 7 , the sensory layer of the eye.
  • the two targets being assessed by the invention are the potential space between the sclera and the choroid, the suprachoroidal space 10 , and the potential space between the retina and the choroid, the sub-retinal space 11 .
  • the device according to the invention comprises a main shaft 12 with a distal end and a proximal end in internal communication with each other, such as, through a lumen 15 .
  • the distal end may comprise a beveled, sharpened tip 13 configured to penetrate ocular tissues with a minimum amount of force to create a tract or passage in the sclera.
  • Tip 13 may comprise a point, a single bevel or multiple bevel surfaces. Bevels (the angle swept by the surfaces with the pointed tip at the apex) in the range of 10°-30° are preferred.
  • the proximal end may comprise attachment receiver 14 such as a female Luer connector to allow for attachment of a syringe or other delivery apparatus.
  • the main shaft 12 may comprise a hollow tube with a lumen 15 .
  • the shaft may have an outer diameter in the range of 41 gauge (0.0028 inch, 0.071 mm) to 20 gauge (0.035 inch, 0.89 mm) and an inner lumen diameter in the range of 0.002 inch (0.05 mm) to 0.023 inch (0.58 mm).
  • the tube may comprise a metal such as tungsten, Nitinol (nickel-titanium alloy) or stainless steel; or a polymer such as polyetheretherketone (PEEK), polycarbonate, nylon or other similar structural engineering polymer.
  • the shaft may incorporate an angle or bend 16 near the distal end.
  • the angle or bend is used to direct the distal tip from an initial approach perpendicular to the surface which allows for ease of entry, to a path which enters the suprachoroidal space or sub-retinal space approximately tangential to the curve of the eye.
  • the bend angles may be in the range of 10°-60°, and preferably in the range of 20°-40°.
  • the shaft 12 may incorporate a mechanical guard to displace the choroid or retina from the sharpened distal tip.
  • the mechanical guard may comprise an element 18 slideably disposed within the lumen 15 or an element disposed outside the diameter of the shaft 12 .
  • the guard 18 may comprise a blunt tip, elongated member 17 , slideably disposed within the lumen 15 of the main shaft, having the guard distal tip extending beyond the distal tip of the main shaft and connected to the body of the device by a compression spring 19 .
  • the guard member 17 is spring loaded in a manner such that when the blunt device tip encounters tissues with substantial mechanical resistance, such as the sclera, the guard member is compressed backwards into the lumen, exposing the sharpened tip of the device and allowing it to penetrate tissues. During advancement within the tissues with the sharpened tip, the spring provides a forward directed force to the guard. When the distal tip encounters an open space or tissues that may be displaced such as the choroid in the case of the suprachoroidal space or the retina in the case of the sub-retinal space, the guard member 17 again extends forward due to the reduced resistance against the tip, ahead of the sharpened tip of the device and thereby displacing the tissues away from the tip of the device.
  • the tissue displacement spring rate for the guard is in the range of about 0.3 lb/in (0.05 N/mm) to 2.8 lb/in (0.50 N/mm) and preferably in the range of 4.6 lb/in (0.8 N/mm) to 1.4 lb/in (0.25 N/mm).
  • the guard member may have a configuration to allow the flow of fluid through the lumen of the main shaft once the guard is deployed and the underlying tissue is displaced.
  • the guard may be configured as part of a removable assembly such that once the sharpened tip is in the appropriate space, the guard assembly may be removed and a delivery device, such as a syringe may be attached to the proximal end to deliver a fluid, therapeutic agent or diagnostic substance.
  • the mechanical guard may comprise a tube 20 slideably disposed on the outside of the main shaft 12 , which is also connected to the main shaft by a compressive element 21 such as a metallic or plastic spring, a polymer with elastic properties or a compressible gas reservoir.
  • the tube is sized and configured to enter the tract or passage in the sclera with the main shaft.
  • the device is configured such that the compressive element 21 exerts a force on the mechanical guard to provide a forward directed force at the distal end.
  • tissue with mechanical resistance greater than the choroid or retina e.g.
  • the tube is displaced backwards (in the proximal direction), exposing and allowing the sharpened tip to penetrate the tissues.
  • the guard enters the tissues and encounters an open space or soft tissue such as the choroid or retina, it slides forward due to the reduced resistance, effectively blocking the distal tip of the device from further penetration.
  • the guard may comprise a flowable or fluidic guard, composed of either a fluid or gas, which is delivered through the distal end of the device to provide a forward directed force and displace the choroid as the device distal tip enters the suprachoroidal space or the displacement of the retina as the distal tip enters the sub-retinal space.
  • the guard may comprise a fluid, such as sterile water, saline, balanced salt solution, silicone oil, surgical viscoelastic, polymer solution or an ophthalmically acceptable perfluorocarbon fluid such as perfluoro-n-octane.
  • the guard may comprise a gas, such as air, nitrogen (N 2 ), carbon dioxide (CO 2 ), or gases used in ophthalmology such as sulfur hexafluoride (SF 6 ) or octafluoropropane (C 3 F 8 ).
  • the guard may comprise the fluid or gas of a therapeutic or diagnostic formulation to be delivered. Fluid or gas volumes and pressures to sufficiently displace the tissues without overinflating the eye but allowing enough space to safely perform an injection are usefully in the range of about 10 microliters to 500 microliters volume and about 0.05 mm Hg to 52 mm Hg gauge pressures, and preferably in the range of 50 microliters to 250 microliters volume and 4 mm Hg to 30 mm Hg gauge pressure.
  • Such a fluidic guard may be delivered through a syringe filled with the fluid or gas attached to the proximal connector.
  • the device comprises a pressurized reservoir 22 for the delivery of a precise amount of the fluidic guard.
  • the reservoir may be configured to deliver the material at a precise pressure and flow rate to achieve displacement of the choroid or retina, while preventing over-inflation of the space.
  • the reservoir may be adapted to be prefilled to a desired volume and pressure. This may be accomplished, for example, by incorporating entries 23 to fill the reservoir, such as injection ports, valves, heat sealable caps or similar entries to allow sterile transfer of materials to the reservoir, which may be accomplished during the manufacture of the device.
  • the reservoir may further be adapted to allow controlled access to the main shaft lumen to allow for the injection of the contents of the reservoir to the target site.
  • Access may be achieved by a septum 24 , seal or plug at the distal end of the reservoir, configured to accommodate an activating mechanism of the device.
  • the reservoir may be configured to deliver a therapeutic or diagnostic substance with a flowable material to act as a fluidic guard.
  • the device comprises a main shaft 12 with a distal, beveled tip 13 and a trigger stop 37 disposed about the shaft.
  • the main shaft is disposed within a proximal hub 38 containing a reservoir 22 .
  • the reservoir comprises a check valve 27 and Luer connector 28 on the proximal end to receive attachments to fill the reservoir.
  • the distal end of the reservoir contains a polymer septum 24 .
  • the proximal end 29 of the main shaft is sealed and disposed through the septum.
  • the proximal end of the main shaft comprises a hole 30 or valve port on the side, the port being distally displaced from the septum when the device is not activated.
  • the reservoir is prefilled with a guard fluid or gas, or a therapeutic agent by a syringe or gas line connection.
  • a tubular element 25 is disposed about the outside of the main shaft distal portion, the element attached to the main shaft by a compression spring 21 .
  • the spring constant is in the range of 0.29 lb/in (0.05 N/mm) to 14.3 lb/in (2.5 N/mm) and preferably in the range of 0.97 lb/in (0.17 N/mm) to 3.37 lb/in (0.59 N/mm).
  • the device is adapted such that upon contact with the surface of the eye, the distal tubular element 25 translates rearward (in the proximal direction) compressing the spring element against the trigger stop 37 until the force reaches a predetermined value set by the spring rate and the coefficient of friction of the septum against the main shaft.
  • a predetermined value set by the spring rate and the coefficient of friction of the septum against the main shaft.
  • continued advancing pressure on the device hub translates the main shaft rearwards, displacing the port 30 proximally to the reservoir side of the septum 31 , releasing the contents of the reservoir to exit the distal tip.
  • the trigger stop may also be configured to limit the rearward travel of the main shaft beyond the point where the reservoir contents are released.
  • the device comprises a main shaft 12 with a distal, beveled tip 13 and a tubular trigger stop 39 disposed about the shaft.
  • the trigger stop has an inner diameter larger than the outer diameter of the main shaft and is attached to the main shaft at the proximal end such that the gap between the trigger stop and the main shaft faces toward the distal end.
  • the main shaft is disposed within a proximal hub 38 containing a reservoir 22 .
  • the reservoir comprises a check valve 27 and Luer connector 28 on the proximal end to receive attachments to fill the reservoir.
  • the distal end of the reservoir contains a polymer septum 24 .
  • the proximal end 29 of the main shaft is sealed and disposed through the septum.
  • the proximal end of the main shaft comprises a hole 30 or valve port on the side, the port being distally displaced from the septum when the device is not activated.
  • the reservoir is prefilled with a guard fluid or gas, or a therapeutic agent by a syringe or gas line connection.
  • a tubular element 25 is disposed about the outside of the main shaft distal portion, the element 25 comprising a thicker walled distal portion 56 and a thin walled proximal portion 40 .
  • the thin walled portion is sized to slide between the tubular trigger stop and the main shaft.
  • the device according to the invention comprises a tubular distal shaft 41 with a distal beveled tip 13 and tubular proximal shaft 42 .
  • the shafts 41 , 42 are slideably disposed with each other and one shaft may be sized so as to slide inside or outside the other shaft.
  • Proximal shaft 42 incorporates a sealed proximal end 29 and a hole or port 30 on the side.
  • An elastomer seal 43 is disposed about the outside of the distal shaft 41 and proximal shaft 42 , across the junction between the two and provides a seal to prevent fluid or gas escape while allowing linear motion between the shafts.
  • the distal shaft is fixed in place to a proximal hub 38 , by way of a cross-bar 44 .
  • An outer housing 45 is slideably disposed about the distal shaft and is attached to the proximal shaft.
  • the outer housing comprises a slot or cut-out 46 to accommodate the cross-bar 44 , allowing the outer housing and proximal shaft to slide independently of the fixed distal shaft 41 .
  • the proximal hub comprises a reservoir 22 with a polymer septum 24 , a check valve 27 to allow pressurization of the reservoir and Luer connector 28 at the proximal end to receive attachments to fill the reservoir.
  • the sealed proximal end 29 of the proximal shaft is disposed through the septum, such that during filling of the reservoir, the port 30 is distally displaced from the septum 24 thereby sealing the reservoir.
  • the reservoir is prefilled with a guard fluid or gas, or a therapeutic substance by a syringe or gas line connection.
  • the device is adapted such that upon contact with a tissue surface of the distal tip of the outer housing, the outer housing 45 and the proximal shaft 42 are translated rearward (in the proximal direction) displacing the port 30 proximally to the reservoir side of the septum 24 , releasing the contents into the main shaft lumen.
  • the device in conjunction with a fluidic guard, may also comprise a sealing element directed at the site of conjunctiva and sclera penetration.
  • the seal is designed to prevent leakage of the fluid or gas through the tissue tract created by the device which would reduce the amount of fluid or gas directed at the underlying choroid or retina to displace the underlying tissue to prevent penetration by the pointed or beveled tip of the main shaft.
  • the seal may be incorporated on the device, for example as an outer tubular sleeve 47 slideably disposed over the main shaft 12 which incorporates a beveled tip 13 .
  • the tubular sleeve incorporates an internal seal 48 to seal the sleeve against the main shaft to prevent fluid or gas reflux between the sleeve and shaft.
  • the proximal end of the main shaft is disposed in a hub 38 comprising a Luer connector 28 for attachment of a fluid or gas delivery mechanism such as a syringe.
  • the distal end of the sleeve acts to seal against the conjunctiva at the surface of the eye or the scleral surface after minor dissection.
  • the tubular sleeve is preferred to have a diameter at the tissue surface to provide sufficient area surrounding the site of tissue penetration to provide an effective seal against the pressure of the fluidic guard.
  • the outer diameter of the tubular sleeve may range from 0.04 inch (1.0 mm) to 0.12 inch (3.0 mm) to provide adequate sealing area on the surface of the eye without unduly obscuring the visualization of the site.
  • the tubular sleeve may be aided by a spring mechanism 21 to provide a sealing force against the eye surface as the inner main shaft penetrates the outer tissues of the eye.
  • the spring constant is the range of 0.29 lb/in (0.05 N/mm) to 14.3 lb/in (2.5 N/mm) and preferably in the range of 0.97 lb/in (0.17 N/mm) to 2.0 lb/in (0.35 N/mm).
  • the spring mechanism may be a mechanical spring or alternatively a gas reservoir or elastomeric component to provide spring-like function.
  • the distal end of the tubular sleeve 47 may incorporate rubber, elastomeric or deformable materials 49 to conform to the tissue surface and aid the sealing effect and reduce the required sealing area.
  • the sealing element may be a separate component 50 that is placed on the eye and the device used to penetrate the seal and underlying conjunctiva and sclera.
  • the separate component may be a soft polymer, rubber or elastomer of a thickness to provide the appropriate main shaft length through the conjunctiva and sclera to reach the target suprachoroidal or sub-retinal space.
  • the separate component may have a target region 51 of decreased thickness sized to fit the outer dimensions of the device when the device is placed on the component to aid location and stabilization of the device when placing the device on the eye, penetrating the seal, and penetrating the overlying conjunctiva and sclera.
  • the separate component may also be of the appropriate thickness to trigger release of the guard fluid or gas once the distal lumen of the main shaft has entered the seal.
  • Mechanical features of the separate component such as a flange, sleeve or rod extending toward the device as it is placed may trigger release of the guard fluid or gas.
  • the device may incorporate a stop 52 , sized to fit within the target region 51 of the sealing element which controls the depth of entry of the distal tip of the device.
  • the device may also comprise indicators to show when the guard has been deployed to protect the underlying choroid and retina, and that a pathway to the suprachoroidal space or sub-retinal space has been established.
  • An indicator may comprise a depth indicator of the mechanical guard or a volume or flow indicator of the reservoir.
  • An indicator may also be coupled to a sensor to initiate a visual or audible signal to the user to limit penetration with the device and indicate that the eye is ready for injection of materials to the suprachoroidal or sub-retinal space.
  • the materials for injection into the suprachoroidal space 32 or sub-retinal space 33 may comprise an implant, a drug solution, drug suspension, or drug containing material such as a gel or solid implant, gene therapy agents, stem cells or cell therapy agents.
  • the device may comprise apparatus to extend a flexible tubular element within the suprachoroidal space or sub-retinal space after deployment of the guard, toward the posterior end of the eye to extend the distal lumen and administer materials to a location closer to the posterior region of the eye.
  • the flexible tubular element is preferred to have a rounded atraumatic distal end to minimize trauma to the choroid or retina.
  • the sleeve 36 remains behind when the device is removed from the eye. As shown in FIG. 14 , sleeve 36 functions as an access port or introducer, in communication from the outside of the eye to the suprachoroidal space 32 or sub-retinal space, for the introduction of other devices such as needles, cannulae or catheters into the space during surgery.
  • the sleeve is typically sized at about 0.0045 inch (0.11 mm) to 0.0355 inch (0.90 mm) outer diameter with a wall thickness in the range of about 0.0005 inch (0.12 mm) to 0.002 inch (0.5 mm) and a length in the range of about 0.60 inch (1.5 mm) to 0.195 inch (5 mm).
  • the sleeve may also have an enlarged diameter or flange at the proximal end to secure the proximal end at the surface of the eye.
  • the sleeve may comprise metals such as nitinol, stainless steel, tungsten or polymers such as polyimide, nylon, polyamide, PEEK, or polycarbonate.
  • the device may further comprise a feature to limit the depth of penetration of the distal tip.
  • This feature may comprise a mechanical stop or flange disposed about the outer diameter of the device body which limits travel by the stop encountering the surface of the eye.
  • the stop may be in the form of a flat surface which may be disposed perpendicularly to the body of the device or may be disposed at an angle to the body such that the angle approximates the angle of the surface of the globe in relation to the angle of entry by the device itself.
  • the stop configurations may be incorporated into the mechanism used to guard the device, such as the outer tubular member previously described.
  • the stop may be adjustable to allow the user to tailor the use of the device to different tissue thicknesses, for example in different regions of the eye.
  • the main shaft 12 with a pointed or beveled distal end 13 will have the appropriate exposed length to access the target site.
  • the length is preferred to be sufficient to expose at least the most distal portion of the lumen to the suprachoroidal space when the device is placed through the conjunctiva and sclera to allow the guard to enter the space and displace the underlying choroid. From anatomic considerations based upon minimum combined tissue thickness of the conjunctiva and sclera of 0.015 inch (0.38 mm), this length to the distal end of the lumen is at minimum 0.025 inch (0.65 mm).
  • the preferred lengths are the effective lengths of the main shaft with respect to the distal edge 53 of the lumen and distal, beveled tip 54 to the distal, tissue contacting surface of the seal 55 .
  • the preferred functional lengths of the main shaft should also account for the mechanical characteristics of the tissues to be penetrated to account for tissue deformation during use of the device.
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of a needle as the main shaft and a spring loaded guard element.
  • the needle element was comprised of a 27 gauge (0.4 mm) ⁇ 0.5 inch (12.7 mm) short bevel hypodermic needle (Monoject, Covidien Inc) as the main shaft.
  • the needle tip bevel angle was 18°, and the proximal end was a standard Luer lock connector.
  • the spring loaded guard element was comprised of a stainless steel wire 0.007 inch (0.18 mm) diameter sized to fit slideably within the lumen of the needle element main shaft and of a length so that the distal tip of the wire extended beyond the distal needle tip by 0.004 inch (0.1 mm).
  • the tip of the wire was rounded so as not to have any sharp edges.
  • the wire was welded into a larger stainless steel tube, sized to slideably fit inside a compression spring.
  • a spring perch was welded to the distal end of said tube.
  • a spring with an inner diameter of 0.049 inch (1.25 mm) and a spring rate of 0.7 lb/in (0.12 N/mm) was placed over said tube.
  • a second outer tube sized to fit slideably about the spring tube and with an outer diameter larger than the spring outer diameter was placed about the spring tube, to act as a proximal stop for the spring.
  • the wire was inserted into the lumen of the needle element.
  • a Touhy-Borst Luer connector was attached to the needle Luer connector, and then tightened about the outer tube to hold it in place. This spring assembly allowed the wire to move rearward inside the needle.
  • a human cadaver eye was used for the experiment.
  • the guard wire tip was placed against the tissue surface and the device advanced slowly into the tissues.
  • the guard tip was seen to retract against the spring pressure, allowing the needle tip to enter the tissues.
  • OCT optical coherence tomography
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of a stainless steel tubular main shaft, 0.79 inches (20 mm) long and 0.016 inches (0.4 mm) outer diameter and 0.008 inches (0.2 mm) inner diameter with a sharp 12° beveled tip.
  • the main shaft was bonded proximally into a plastic female Luer connector.
  • a mechanical guard element comprised of a distal thin walled polyimide tube with an inner diameter 0.0165 inches (0.42 mm) and outer diameter of 0.0175 inches (0.45 mm) was bonded to a proximal stop 0.04 inches (1.0 mm) in diameter.
  • the distal end of the polyimide tubing was beveled to allow for entry into the tissues.
  • the guard member was loaded onto the main shaft with a stainless steel spring of 0.017 inches (0.43 mm) inner diameter with the spring wire diameter of 0.005 inches (0.13 mm) between the guard and the plastic hub, disposed about the main shaft.
  • the device was tested using a human cadaver eye. The tip of the device was inserted into the sclera and advanced forward. The mechanical guard was pushed rearward, allowing the sharp main shaft tip to enter the scleral tissues. With continued advancement, the guard element was also advanced into the sclera.
  • OCT Optical Coherence Tomography
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of a metal main shaft 0.79 inches (20 mm) long and 0.016 inches (0.41 mm) outer diameter and 0.008 inches (0.2 mm) inner diameter with a sharp beveled tip.
  • the main shaft was sealed at the proximal end and a side hole was made approximately 0.197 inches (5 mm) from the end.
  • the device distal tip was angled to 30° and 0.059 inches (1.5 mm) length.
  • the device featured a spring retractable metal sleeve disposed about the main shaft distal tip and that acted as a mechanism to trigger the infusion of gas into the suprachoroidal space when it retracted.
  • the spring proximal end was attached to a metal sleeve that added structural support of the main shaft and Luer attachment.
  • a Luer connector with a polymer septum was secured to the proximal end of the main shaft such that the main shaft penetrated the septum with the side hole distal to the septum.
  • a check valve assembly was attached to the Luer connector to serve as a gas filled reservoir providing a means of infusing gas into suprachoroidal space to displace the choroid.
  • the device was tested using a human cadaver eye.
  • the device angled tip was inserted into the sclera near the pars plana and advanced until the angled tip was positioned in the suprachoroidal space.
  • the distal metal sleeve was pushed rearward until the spring force overcame the frictional force of the main shaft in the septum, which drove the proximal end of the main shaft through the septum positioning the side hole above the septum.
  • Gas within the chamber was released through the main shaft, out the tip, and into the suprachoroidal space.
  • Optical Coherence Tomography (OCT) imaging confirmed the tip location within the suprachoroidal space and release of the fluidic air guard, displacing the choroid to prevent contact of the choroid with the tip.
  • OCT Optical Coherence Tomography
  • a device according to one embodiment of the invention was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device main shaft was comprised of a 0.016 inches (0.41 mm) outer diameter and 0.008 inches (0.2 mm) inner diameter and 0.984 inches (25 mm) long injection needle with sharp bevel straight tip and proximal Luer connector. Additional design features included a metal proximal and distal outer housing assembly, 0.028 inch (0.7 mm) diameter by 0.472 inches (12 mm) long segments connected by a 0.197 inches (5 mm) long coil spring. The distal outer housing segment provided a spring retractable protective sleeve and insertion depth stop at the main shaft distal tip.
  • the proximal outer housing segment was attached to the main shaft for improved device rigidity.
  • the proximal main shaft open end was inserted into a polymer septum of a pressurized fluid filled reservoir.
  • the device was tested using a human cadaver eye.
  • the proximal main shaft moved backward axially, pierced through the septum and into the fluid reservoir.
  • the reservoir content was then released into the open end of the proximal main shaft and discharged out the distal tip and into the suprachoroidal space.
  • the resulting choroid displacement to prevent contact of the distal tip with the choroid was monitored and confirmed in real time with ultrasound imaging.
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of a metal main shaft 0.79 inches (20 mm) long and 0.016 inches (0.41 mm) outer diameter and 0.008 inches (0.2 mm) inner diameter with a sharp beveled tip.
  • the main shaft was sealed at the proximal end and a side hole was made approximately 0.197 inches (5 mm) from the end.
  • a Luer connector with a polymer septum was secured to the proximal end of the main shaft such that the main shaft penetrated through, with the side hole distal to the septum.
  • a check valve assembly was attached to the Luer connector providing for a fillable gas reservoir of approximately 100 microliters volume.
  • a metal sleeve with an inner diameter of 0.020 inches (0.51 mm) and an outer diameter of 0.028 inch (0.71 mm) was disposed about the main shaft and attached to it near the proximal end. The sleeve acted as a mechanism to trigger the release of the gas filled reservoir into the suprachoroidal space when forced rearward, translating the side port to the reservoir side of the septum.
  • An access port element 0.0065 inch (0.17 mm) inner diameter and 0.0005 inch (0.012 mm) wall thickness comprised of polyimide was disposed about the outside of the main shaft and inserted under the metal sleeve.
  • the device was tested using a human cadaver eye.
  • the device tip was inserted into the sclera near the pars plana and advanced until the tip entered the suprachoroidal space and the sleeve triggered the release of the reservoir, injecting gas to displace the choroid.
  • the port element was then advanced forward into the suprachoroidal space.
  • Optical Coherence Tomography (OCT) imaging confirmed the distal end of the port location within the suprachoroidal space and a fluid injection was made through the port, while confirming inflation of the suprachoroidal space on imaging.
  • OCT Optical Coherence Tomography
  • Example 5 Devices fabricated according to Example 5 were tested to determine the delivered pressure of a gaseous fluidic guard based upon the amount of gas charged into the reservoir and to determine the amount of choroidal displacement achieved due to the gas charge in the reservoir.
  • a diaphragm pressure transducer (PX26-100GV, Omega Engineering) was modified to place a Luer injection port into the transducer port, minimizing the dead volume of the transducer.
  • the transducer was connected to a digital readout (DP-41S, Omega Engineering) and then calibrated to read out in mm Hg.
  • the main shaft needle tip of a device under test was inserted into the injection port of the pressure transducer.
  • the check valve was removed and the Luer connector advanced to open the internal valve mechanism and equalize the system pressure.
  • the Luer connector was then pulled back, closing the internal valve and the check valve was re-installed.
  • a 1 cc syringe was filled with a volume of air, attached to the check valve Luer connector of the device and then expelled to charge the reservoir.
  • the device was advanced to open the internal valve and the gauge pressure of the delivered gas was read from the digital readout.
  • Syringe volumes of 0.1 cc to 0.7 cc were tested. However the actual fill volume of the reservoir was less than the syringe volume. Due to the fixed volume of the reservoir and the limited ability of a manual syringe to compress the gas, a small amount of gas refluxed into the syringe as evidenced by the rebound of the syringe plunger after full depression of the plunger.
  • Additional devices were tested in-vitro using both human and porcine cadaver eyes, and in-vitro using a live porcine animal model.
  • a 1 cc syringe was used to load the device reservoirs with 0.2, 0.4 or 0.6 cc of air.
  • the devices were advanced into the eyes, activating the internal valve and releasing the reservoir contents, and the resultant choroidal displacement was measured using high frequency ultrasound imaging.
  • the table below shows the experimental results.
  • a device fabricated according to Example 5 was tested for its ability to deliver a therapeutic agent to the suprachoroidal space.
  • Porcine cadaver eyes were used in the experiment.
  • the device reservoir was charged with 0.5 cc of air as the fluidic guard material.
  • the device was placed against the sclera of the cadaver eye and advanced until the distal tip entered the suprachoroidal space and discharged the reservoir gas, displacing the choroid away from the tip.
  • TA triamcinolone acetonide
  • Kenalog 40 Bristol Meyers Squib
  • a perfusion system was set-up consisting of a reservoir of phosphate buffered saline (PBS) on a variable height platform. Tubing was attached to a port at the bottom edge of the reservoir, leading to a shut-off valve and a small tube with a Luer connector at the end. A 30 gauge (0.3 mm) hypodermic needle was attached to the reservoir Luer connector. The reservoir was elevated to provide 0.29 PSI (15 mm Hg) pressure. The 30 gauge needle was inserted through the cornea and into the anterior chamber to provide perfusion to the cadaver eye.
  • PBS phosphate buffered saline
  • the eye was allowed to perfuse for 6 hours at constant pressure. After the perfusion, the sclera of the eye over the injection site was dissected and removed. Examination under a light microscope showed the depot location of the TA particles on the choroid surface around the injection site. Also noted was a stream of particles extending approximately 0.55 inches (14 mm) posterior from the injection site, indicating a flow directed movement of the injectate towards the posterior pole of the eye.
  • Example 5 In another test, a device fabricated according to Example 5 was tested in the manner of Example 5, however the device reservoir was charged with the suspension steroid instead of air. A syringe with additional injectate was attached to the device. The device was advanced into the tissues and the reservoir fluid contents were discharged when the suprachoroidal space was reached, displacing the choroid and allowing for injection of the remaining fluid in the syringe into the suprachoroidal space. The injection location and tissue displacement was confirmed by ultrasound imaging.
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the shafts and housings of the device were fabricated from 304 stainless steel hypodermic tubing.
  • the device was comprised of a distal shaft of 0.016 inches (0.4 mm) outer diameter and 0.008 inches (0.2 mm) inner diameter by 0.75 inches (19 mm) long.
  • the distal shaft had a standard hypodermic beveled tip with a main bevel angle of 12°.
  • a shaft extension of 0.017 inches (0.43 mm) inner diameter and 0.025 inches (0.64 mm) outer diameter and 0.24 inches (6 mm) long was welded to the back of the distal shaft.
  • a proximal shaft the same diameter as the distal shaft and 0.42 inches (10.8 mm) long was cut and one end was welded shut. A side hole was ground through the wall 0.005 inches (0.13 mm) from the welded end. The distal end of the proximal shaft was slid inside the shaft extension on the distal shaft. A piece of 50 durometer silicone tubing 0.015 inches (0.38 mm) inner diameter by 0.027 inches (0.69 mm) by 0.2 inches (5 mm) long was placed over the junction between the proximal and distal shafts to seal the gap. An outer housing of 0.033 inches (0.84 mm) inner diameter by 0.046 inches (1.17 mm) outer diameter by 0.71 inches (18 mm) long was cut.
  • one half of the outer housing was ground off leaving a half circle of tubing.
  • An extension tube of 0.02 inches (0.51 mm) inner diameter by 0.032 inches (0.81 mm) outer diameter by 0.55 inches (14 mm) long was welded into the distal end of the outer housing, so as to act as the tissue contact portion of the moving assembly.
  • the distal/proximal shaft assembly was placed inside the outer housing and a cross beam was welded to the distal shaft.
  • the cross beam was adhesively bonded to a polycarbonate Luer connector.
  • a solid disk of 50 durometer silicone rubber was inserted as a septum, with the tip of the proximal shaft just penetrating the septum so that the side hole was below the septum.
  • a Luer check valve was attached to the Luer connector creating a sealed reservoir that could be filled from the Luer connector on the check valve.
  • the device was tested using a human cadaver eye.
  • the reservoir was filled with air from a syringe.
  • the device was placed against the tissue surface and advanced.
  • the outer housing assembly translated rearward, the side hole in the proximal shaft was translated to the reservoir side of the septum.
  • the gas was released to displace the choroid and an injection of a suspension steroid (Kenalog 40, Bristol Meyers Squib) was made into the suprachoroidal space.
  • the injection location was confirmed with ultrasound imaging.
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of a commercial 27 ga (0.4 mm) by 0.5 inch (12.7 mm) short bevel hypodermic needle (Monoject 27 g ⁇ 1 ⁇ 2 needle, Covidien Inc.) with a bevel main angle of 18° as the main shaft.
  • a sliding seal assembly was fabricated as follows. Two pieces of polycarbonate tubing of 0.018 inches (0.46 mm) inner diameter by 0.060 inches (1.52 mm) outer diameter were cut, a long piece at 0.37 inches (9.4 mm) and a short piece at 0.08 inches (2.0 mm) long.
  • the proximal end of the longer piece was counter-bored at 0.028 inches (0.71 mm) diameter by 0.05 inches (1.3 mm) deep.
  • a piece of 50 durometer silicone tubing 0.015 inches (0.38 mm) inner diameter by 0.027 inches (0.69 mm) outer diameter by 0.04 inches (1.0 mm) long was cut and inserted into the counter-bore in the long tube as an inner seal.
  • the short piece of polycarbonate tubing was then adhesively bonded to the long tube over the counter-bore to cap the inner seal in place.
  • a piece of 50 durometer silicone tubing of 0.025 inches (0.64 mm) inner diameter by 0.047 inches (1.2 mm) outer diameter was placed over the distal end of the polycarbonate assembly to form an outer seal.
  • the silicone tubing was placed such that the distal edge extended beyond the end of the polycarbonate tubing to serve as a seal against the tissue surface.
  • a spring with a spring constant of 0.97 lb/in (0.17 N/mm) was placed over the hypodermic needle and the sealing assembly was slid over the needle.
  • the device was tested using human cadaver eyes. 1 cc syringe was filled with 0.1 cc of a suspension steroid (Kenalog 40, Bristol Meyers Squib) and the syringe attached to the device. The tip of the device was placed in contact with the tissues and light pressure was placed on the syringe plunger, effectively pressurizing the fluid pathway. The device was advanced into the tissues, keeping the sealing assembly in contact with the surface and maintaining pressure on the syringe plunger. When the needle tip advanced through the sclera a sufficient distance, the fluid was able to be injected, displacing the choroid and injecting the fluid into the suprachoroidal space. The injection location was confirmed with ultrasound imaging.
  • a device was fabricated and tested for its ability to successfully penetrate the sclera and displace the choroid for access to the suprachoroidal space.
  • the device was comprised of an elastomeric tissue surface seal and a needle assembly as the main shaft with an integral depth stop. Two different models of the tissue surface seal were fabricated.
  • the surface seal was comprised of 50 A durometer silicone rubber.
  • Disc shaped base elements, 0.06 inch (1.6 mm) in thickness were fabricated, either 0.17 inch (4.4 mm) or 0.26 inch (6.6 mm) in diameter.
  • Annular shaped seal elements of the same thickness were fabricated with an outer diameter of 0.17 inch (4.4 mm) and an inner diameter of 0.06 inch (1.52 mm).
  • An annular element was adhesively bonded centrally to a base element, using room-temperature vulcanization (RTV) silicone adhesive.
  • a main shaft needle assembly was fabricated comprising a 27 ga (0.4 mm) ⁇ 0.5 inch (12.7 mm) short bevel hypodermic needle (Monoject, Covidien Inc.).
  • a short length of polycarbonate tubing 0.018 inches (0.46 mm) inner diameter by 0.06 inches (1.52 mm) outer diameter was placed over the needle shaft as a depth stop. The tubing was cut to a length so that the exposed needle length was 0.13 inch (3.35 mm). In combination with the thickness of the tissue seal base, this length would provide for a needle length extending beyond the base element, to enter the tissues, of 0.07 inch (1.75 mm).
  • the outer diameter of depth stop was sized to fit snugly and seal within the inner diameter of the annular seal element.
  • a human cadaver eye was prepared. The tissue surface at the pars plana was carefully dried and a tissue seal assembly was placed in contact with the surface and pressed down to effect a seal.
  • a 1 cc syringe was filled with 0.1 cc of triamcinolone acetonide steroid suspension (Kenalog 40, Bristol Meyers Squib) and attached to the needle assembly.
  • the needle tip was inserted into the center of the base element and advanced so that the depth stop entered the inner diameter of the annular element, sealing the fluid pathway.
  • the needle advance was continued along with light pressure on the syringe plunger. When the depth stop reached the based element, and with the needle inserted to full depth, the injection was made. Ultrasound imaging confirmed the injectate in the suprachoroidal space. Both tissue seal devices, having different base element diameters, were successful.
  • An adjustable stop was fabricated, sized to go over a 27 gauge (0.4 mm) hypodermic needle used as the main shaft. The distal end of the stop was 1.5 mm (0.06 inch) in diameter and the stop could be fixed in place so as to be able to have a set amount of needle tip extending beyond it. Two different needle bevels were tested.
  • a standard hypodermic needle, with a nominal main bevel angle of 12 degrees (Precision Glide—27 ga ⁇ 1 ⁇ 2 inch, Becton-Dickenson) and a short bevel needle, with a nominal main bevel angle of 18 degrees (Monoject 250—27 ga ⁇ 1 ⁇ 2 inch, Covidien) were used in the tests.
  • the adjustable stop was set to a preset needle length, as measured with a digital caliper.
  • the needle tip was inserted into the tissue at the pars plana and with the adjustable stop fully pressed against the tissue surface and an injection of the triamcinolone was attempted.
  • the injection was then evaluated using the ultrasound system to determine whether the injection was A) unsuccessful, i.e. no injection, too shallow, B) successful in injecting into the suprachoroidal space, or C) injected into the vitreous cavity, i.e. too deep.
  • the following table presents the test results along with the distance between the distal end of the adjustable stop and the distal edge of the needle tip lumen. The results indicate a main shaft or needle length greater than 0.05 inch (1.25 mm) and less than 0.12 inch (3.00 mm) provide the best results for injection into the suprachoroidal space.
  • the device of Example 5 was filled with 0.3 ml of air to act as a fluidic guard.
  • the device was used to access the suprachoroidal space of eyes in anesthetized pigs at the pars plana region of the eye. Once the gas was injected into the suprachoroidal space, the device was used to inject 0.1 ml (4 mg) of triamcinolone acetonide suspension (Kenalog-40, Bristol Meyers Squib). Twelve eyes were injected and three each harvested at 1, 7, 14 and 30 days post injection. The eyes were dissected and 6 mm punches taken from the vitreous, retina, choroid and sclera at four quadrants of the eye and also the posterior retina.
  • the level of drug in the tissues was assayed by solvent extraction of the tissues and quantitation by reverse phase HPLC.
  • the results shown in FIG. 16 demonstrated sustained availability of triamcinolone acetonide in all regions of the eye, including the posterior retina through 30 days with the highest level of drug in the choroid and decreasing levels of drug in the sclera, retina and vitreous.

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US13/273,775 2010-10-15 2011-10-14 Device for ocular access Abandoned US20120271272A1 (en)

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US13/273,775 US20120271272A1 (en) 2010-10-15 2011-10-14 Device for ocular access
US14/821,310 US20160193080A1 (en) 2010-10-15 2015-08-07 Device for ocular access
US15/872,206 US10952894B2 (en) 2010-10-15 2018-01-16 Device for ocular access
US17/208,235 US20220062040A1 (en) 2010-10-15 2021-03-22 Device for ocular access
US17/523,168 US12090088B2 (en) 2010-10-15 2021-11-10 Device for ocular access
US18/775,528 US20250177201A1 (en) 2010-10-15 2024-07-17 Device for ocular access

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US13/273,775 US20120271272A1 (en) 2010-10-15 2011-10-14 Device for ocular access

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US15/872,206 Active 2032-09-03 US10952894B2 (en) 2010-10-15 2018-01-16 Device for ocular access
US17/208,235 Abandoned US20220062040A1 (en) 2010-10-15 2021-03-22 Device for ocular access
US17/523,168 Active US12090088B2 (en) 2010-10-15 2021-11-10 Device for ocular access
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US17/208,235 Abandoned US20220062040A1 (en) 2010-10-15 2021-03-22 Device for ocular access
US17/523,168 Active US12090088B2 (en) 2010-10-15 2021-11-10 Device for ocular access
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US12090088B2 (en) 2024-09-17
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US20250177201A1 (en) 2025-06-05
WO2012051575A3 (en) 2012-06-14
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US20220062041A1 (en) 2022-03-03
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US20160193080A1 (en) 2016-07-07
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WO2012051575A2 (en) 2012-04-19

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