Patent US3776238A successfully refreshed from Google Patents.
US3776238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmic instrument
Assignee: University of California
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Filing: 1971-08-24
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Granted: 1973-12-04
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Expires: 1991-08-24
Abstract
Abstract An ophthalmic instrument is provided for removing vitreous and fibrous bands from the retina of an eye. The instrument consists of two tubes mounted coaxially within one another, and with an opening adjacent the end of the outer tube. Cutting of the vitreous and fibrous bands is performed by a chopping action set up by the sharp end of the inner tube against the inner surface of the end of the outer tube. The vitreous and fibrous bands which are trapped in the mouth of the instrument are chopped and removed by suction by way of the inner tube. In the instrument to be described, the vitreous is replaced continuously by a saline solution, for example, which is introduced into the instrument by way of a small infusion tube.
Inventors
- 👤 G Peyman
- 👤 N Dodich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/00736; A61F9/00763
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
An ophthalmic instrument for re-ceiving vitreous, lens, and the like, from the eye, said instrument including: an elongated tubular housing having an open end and a closed end, and having an opening in the side wall thereof adjacent said closed end; a tubular member mounted coaxially within said tubular housing in sliding contact with the inner surface of said tubular housing and extending through the open end thereof, said tubular member providing a passage for the vitreous material, and the like, to remove such material from the interior of said tubular housing, and said tubular member having an annular cutting edge facing said closed end of said tubular housing; electrically actuated means for producing relative axial movement between said tubular housing and said tubular member whereby said tubular member incises substances drawn into said opening in said tubular housing; means coupling said tubular member to a suction pressure source to draw the inciSed substances from said housing up through said tubular member; and an infusion tube mounted externally on said tubular housing for introducing a replacement fluid into the eye during the operation of the instrument, when the tubular housing is inserted into the eye, to maintain constant pressure within the eye.
Claim 2
Dependent Claim
202 words
An ophthalmic instrument for re-ceiving vitreous, lens, and the like, from the eye, said instrument including: an elongated tubular housing having an open end and a closed end, and having an opening in the side wall thereof adjacent said closed end; a tubular member mounted coaxially within said tubular housing in sliding contact with the inner surface of said tubular housing and extending through the open end thereof, said tubular member providing a passage for the vitreous material, and the like, to remove such material from the interior of said tubular housing, and said tubular member having an annular cutting edge facing said closed end of said tubular housing; electrically actuated means for producing relative axial movement between said tubular housing and said tubular member whereby said tubular member incises substances drawn into said opening in said tubular housing; means coupling said tubular member to a suction pressure source to draw the inciSed substances from said housing up through said tubular member; and an infusion tube mounted externally on said tubular housing for introducing a replacement fluid into the eye during the operation of the instrument, when the tubular housing is inserted into the eye, to maintain constant pressure within the eye.
Claim 3
Dependent Claim
22 words
The combination defined in claim 1, and which includes further means coupling said infusion tube to a pressurized source of replacement fluid.
Claim 4
Dependent Claim
41 words
The instrument defined in claim 1, and which includes a manipulator for supporting the instrument, said manipulator having a ball joint therein through which said tubular housing protrudes, so as to permit positioning of the instrument at any desired angular position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |