US4689040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tip for a phacoemulsification needle
Assignee: Individual
•
Filing: 1985-04-29
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Granted: 1987-08-25
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Expires: 2005-04-29
Abstract
Abstract An improved tip for a phacoemulsification needle having a lumen and a wall; wherein the improved tip comprises an oblique, generally concave face in side view and concentrates the majority of the effective cross-sectional area of the lumen toward the rear. An exemplary embodiment employs a maximum total face angle of 40 degrees with the face further comprising in side view from top to bottom: a first lead-in angle; a second horizontal section at a height of approximately 20-25 percent the needle diameter; and a third section defined as an arc of a circle extending tangential to the second horizontal section and extending to the top wall of the needle wherein the radius of the circle is approximately the distance between the second section and the upper wall. The improved tip is for use on hollow, ultrasonically vibrated needles of the type used for the surgical removal of cataract, abscess, hemorrhage, or other unwanted material. The improved tip is particularly designed to allow for the emulsification and aspiration of the lens of an eye in the lens chamber by increasing operative visability and reducing the incidence of pressure transients and surge, thereby reducing the danger of rupturing the posterior capsule and loss of vitreous. With the improved tip which permits material sculpting and manipulation, phacoemulsification can be accomplished without aid of another instrument.
Inventors
- 👤 Robert J. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:02
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/22; A61B17/22004; A61F; A61F9/00; A61F9/007; A61F9/00736; A61F9/00745; A61B17/32; A61B17/320068; A61B2017/320072; A61B2017/320078; A61B2217/00; A61B2217/002; A61B2217/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
In a phacoemulsification needle having a proximal end attachable to a phacoemulsification device and a distal end insertable into an eye; the needle having a central longitudinal axis extending from the proximal end to the distal end; a bore within the needle concentric to the central axis thereof, so as to form a lumen, the lumen having side walls therearound, having inner and other surfaces with an opening at the proximal and distal ends of the needle, an improved tip comprising: a tip formed by the distal opening which when viewed from an angle perpendicular to said central axis has a side view comprising: a top wall located at a needle side wall on one side of said central axis; a bottom wall located at a needle side wall on the opposite side of said central axis, and a tip face extending between said top and bottom walls; said bottom wall of the tip forms a distally projecting tip section which when viewed from an angle perpendicular to said longitudinal axis and parallel to said bottom wall has a leading edge between said outer and inner sidewall surfaces formed at an angle of between 15 and 60 degrees to said longitudinal axis; and said tip face has a concave outline extending from the inner surface of said bottom wall to the inner surface of said top wall which has a radius of approximately 1 to 11/2 times the diameter of said lumen.
Claim 2
Dependent Claim
242 words
In a phacoemulsification needle having a proximal end attachable to a phacoemulsification device and a distal end insertable into an eye; the needle having a central longitudinal axis extending from the proximal end to the distal end; a bore within the needle concentric to the central axis thereof, so as to form a lumen, the lumen having side walls therearound, having inner and other surfaces with an opening at the proximal and distal ends of the needle, an improved tip comprising: a tip formed by the distal opening which when viewed from an angle perpendicular to said central axis has a side view comprising: a top wall located at a needle side wall on one side of said central axis; a bottom wall located at a needle side wall on the opposite side of said central axis, and a tip face extending between said top and bottom walls; said bottom wall of the tip forms a distally projecting tip section which when viewed from an angle perpendicular to said longitudinal axis and parallel to said bottom wall has a leading edge between said outer and inner sidewall surfaces formed at an angle of between 15 and 60 degrees to said longitudinal axis; and said tip face has a concave outline extending from the inner surface of said bottom wall to the inner surface of said top wall which has a radius of approximately 1 to 11/2 times the diameter of said lumen.
Claim 3
Dependent Claim
278 words
In a phacoemulsification needle having a proximal end attachable to a phacoemulsification device and a distal end insertable into an eye; the needle having a central longitudinal axis extending from the proximal end to the distal end; a bore within the needle concentric to the central axis thereof, so as to form a lumen, the lumen having side walls therearound, having inner and other surfaces with an opening at the proximal and distal ends of the needle, an improved tip comprising: a tip formed by the distal opening which when viewed from an angle perpendicular to said central axis has a side view comprising: a top wall located at a needle side wall on one side of said central axis; a bottom wall located at a needle side wall on the opposite side of said central axis, and a tip face extending between said top and bottom walls; said bottom wall of the tip forms a distally projecting tip section which when viewed from an angle perpendicular to said longitudinal axis and parallel to said bottom wall has a leading edge between said outer and inner sidewall surfaces formed at an angle of between 15 and 60 degrees to said longitudinal axis; and tip side walls extending vertically from said bottom wall having a height greater than the thickness of said bottom wall but less than or equal to 40% of the separation between said bottom and top walls with said tip side walls having top edges extending substantially parallel to said central axis between said distally extending tip and said top wall, said top edges having a predetermined length greater than the thickness of said bottom wall.
Claim 4
Dependent Claim
278 words
In a phacoemulsification needle having a proximal end attachable to a phacoemulsification device and a distal end insertable into an eye; the needle having a central longitudinal axis extending from the proximal end to the distal end; a bore within the needle concentric to the central axis thereof, so as to form a lumen, the lumen having side walls therearound, having inner and other surfaces with an opening at the proximal and distal ends of the needle, an improved tip comprising: a tip formed by the distal opening which when viewed from an angle perpendicular to said central axis has a side view comprising: a top wall located at a needle side wall on one side of said central axis; a bottom wall located at a needle side wall on the opposite side of said central axis, and a tip face extending between said top and bottom walls; said bottom wall of the tip forms a distally projecting tip section which when viewed from an angle perpendicular to said longitudinal axis and parallel to said bottom wall has a leading edge between said outer and inner sidewall surfaces formed at an angle of between 15 and 60 degrees to said longitudinal axis; and tip side walls extending vertically from said bottom wall having a height greater than the thickness of said bottom wall but less than or equal to 40% of the separation between said bottom and top walls with said tip side walls having top edges extending substantially parallel to said central axis between said distally extending tip and said top wall, said top edges having a predetermined length greater than the thickness of said bottom wall.
Claim 5
Dependent Claim
27 words
The tip of claim 2 wherein said tip face has a concave outline extending between the top edges of said tip side walls and said top wall.
Claim 6
Dependent Claim
45 words
The tip of claim 3 wherein said outline is defined as an arc of a circle for which said top edge of said tip side walls is a tangent, having a radius equal to the distance between said tip side walls and said top side.
Claim 7
Dependent Claim
19 words
The tip of claim 2 wherein said tip face has a maximum total face angle of approximately 50 degrees.
Claim 8
Dependent Claim
25 words
The tip of claim 2 wherein said tip side walls have a height of between 20 to 25 percent of the diameter of said needle.
Claim 9
Dependent Claim
28 words
The tip of claim 6 wherein the majority of the projected cross-section of said lumen is at least 0.025 inches from a foremost extension of said distal end.
References Cited (Backward Citations)
US1601709A
Cited
US3048173A
Cited
US3589363A
Cited
US3460255A
Cited
US3528425A
Cited
US3732858A
Cited
US3844272A
Cited
US3805787A
Cited
US3857387A
Cited
US3902495A
Cited
US4132227A
Cited
US4320761A
Cited
US4515583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |