Device for treating glaucoma
An implantable device for treatment of glaucoma of the eye. In one aspect, the device includes an elongate duct for diverting aqueous humor from the anterior chamber of the eye, the elongate duct having a central axis with a proximal end and distal end opposite one another. A least one element is spaced apart from the proximal end and the distal end of said elongate duct and extends radially outward beyond an outer surface of said elongate duct in at least two directions transverse to the central axis of said elongate duct, wherein the at least one element has a distal portion with a tapered profile facing the distal end of said elongate duct. The at least one element has a hardness within a range between Shore 30A and Shore 80A. Other aspects are also described and claimed.
1. An implantable device for treatment of glaucoma of the eye, the implantable device comprising:
an elongate duct for diverting aqueous humor from the anterior chamber of the eye, said elongate duct having a central longitudinal axis with a proximal end and distal end opposite one another; and
first and second tabs that are spaced apart from the proximal end and the distal end of said elongate duct and extend radially outward beyond an outer surface of said elongate duct on opposite sides of said elongate duct to respective outer edges, wherein each outer edge has a first portion having a tapered profile facing the distal end of said elongate duct, and has a second portion at a maximal radial offset with respect to the central longitudinal axis, the second portion of said outer edges defining a maximal cross-sectional dimension of the device, and wherein the first and second portions of each outer edge extend longitudinally relative to the central longitudinal axis of said elongate duct;
wherein said first and second tabs each have a hardness within a range between Shore 30A and Shore 80A, and wherein said outer edges of said first and second tabs are configured to contact and form a seal with ocular tissue that surrounds said first and second tabs.
2. An implantable device according to claim 1 , wherein:
said first and second tabs extend radially outward beyond the outer surface of said elongate duct in two opposed directions transverse to the central axis of said elongate duct.
3. An implantable device according to claim 1 , wherein:
said first and second tabs have a hardness different from said elongate duct.
4. An implantable device according to claim 1 , wherein:
said first and second tabs are configured to deform in a tissue passage leading into the anterior chamber of the eye as it is inserted into the passage in response to forces applied by surrounding ocular tissue of the tissue passage.
5. An implantable device according to claim 1 , wherein:
said outer edges of said first and second tabs are blunt.
6. An implantable device according to claim 5 , wherein:
the elongate duct has a maximal cross-sectional dimension no more than 0.4 mm; and
the maximal cross-sectional dimension of the device defined by the outer edges of the first and second tabs is at least 0.9 mm.
7. An implantable device according to claim 1 , wherein:
the elongate duct has a proximal portion defining a cylindrical outer surface and a distal portion defining a cylindrical outer surface; and
said first and second tabs are disposed intermediate the cylindrical outer surfaces of said proximal and distal portions of said elongate duct.
8. An implantable device according to claim 7 , wherein:
the first and second tabs are generally planar in form and extend in a common plane radially outward beyond the cylindrical outer surfaces of said proximal and distal portions of said elongate duct to the respective outer edges having tapered first portions that extend radially and longitudinally with respect to the central longitudinal axis and face the distal end of said elongate duct.
9. An implantable device according to claim 8 , wherein:
the distal end of the elongate duct has a tapered profile.
10. An implantable device according to claim 7 , wherein:
said second portion of said outer edge of said first tab is a first blunt outer surface, said second portion of said outer edge of said second tab is a second blunt outer surface, wherein the maximal cross-sectional dimension of the device is defined by maximal distance between the first blunt outer surface and the second blunt outer surface.
11. An implantable device according to claim 1 , wherein:
said first and second tabs define a circumferential perimeter about said device; and
said first and second tabs are configured to form a seal with ocular tissue that surrounds the circumferential perimeter about said device.
12. An implantable device according to claim 1 , wherein:
the elongate duct has an outer surface having a diameter; and
said first and second tabs each have a cross-sectional profile orthogonal to the central axis with a maximal thickness that is greater than or equal to the diameter of said outer surface of said elongate duct.
13. An implantable device according to claim 1 , wherein:
the first and second tabs are part of a wedge-shaped body extending radially and longitudinally to the respective outer edges having tapered first portions that extend radially and longitudinally with respect to the central longitudinal axis and face the distal end of said elongate duct.
14. An implantable device for treatment of glaucoma of the eye, the implantable device consisting of:
an elongate duct for diverting aqueous humor from the anterior chamber of the eye, said elongate duct having a central longitudinal axis with a proximal end and distal end opposite one another; and
first and second tabs that are spaced apart from the proximal end and the distal end of said elongate duct and extend radially outward beyond an outer surface of said elongate duct on opposite sides of said elongate duct to respective outer edges, wherein each have each outer edge has a first portion having a tapered profile facing the distal end of said elongate duct, and has a second portion at a maximal radial offset with respect to the central longitudinal axis, the second portion of said outer edges defining a maximal cross-sectional dimension of the device, and wherein the first and second portions of each outer edge extend longitudinally relative to the central longitudinal axis of said elongate duct,
wherein said first and second tabs each have a hardness within a range between Shore 30A and Shore 80A, and wherein said outer edges of said first and second tabs are configured to contact and form a seal with ocular tissue that surrounds said first and second tabs.
15. An implantable device according to claim 14 , wherein:
the first and second tabs are not spaced axially from one another along the central axis.
16. An implantable device according to claim 14 , wherein:
the first and second tabs are part of a wedge-shaped body extending radially and longitudinally to the respective outer edges having tapered first portions that extend radially and longitudinally with respect to the central longitudinal axis and face the distal end of said elongate duct.
17. An implantable device according to claim 14 , wherein:
the first and second tabs are generally planar in form and extend in a common plane radially outward beyond the cylindrical outer surfaces of said proximal and distal portions of said elongate duct to the respective outer edges having tapered first portions that extend radially and longitudinally with respect to the central longitudinal axis and face the distal end of said elongate duct.
18. An implantable device according to claim 17 , wherein:
the distal end of the elongate duct has a tapered profile.