US4236519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal punch
Assignee: Medtronic Xomed LLC
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Filing: 1978-04-06
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Granted: 1980-12-02
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Expires: 1998-04-06
Abstract
Abstract A cylindrical sleeve has a conically tapered end from which three spring members extend. Additionally, within the sleeve is a shaft that has a portion which extends from the tapered end. The extending portion includes an end of the shaft in the shape of a right truncated cone. The spring members, the extending portion and the tapered end are all inserted within a hollow cylindrical blade that has a cutting edge at its distal end. An edge of the proximal end of the blade is maintained in contact with the tapered end by adjusting the length of the extending portion to cause the extending portion to push the spring members against the interior surface of the blade.
Inventors
- 👤 Joseph A. La Russa
- 👤 Richard C. Troutman
- 👤 Anthony R. Attler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:13
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F2/00; A61F2/02; A61F2/14; A61F2/142; A61F9/013
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A corneal punch for cutting a portion of the cornea of an eye, comprising: a sleeve with an outer portion that has a conical taper, said sleeve being adapted for insertion within a hollow cylindrical blade that has a cutting edge at its distal end, said insertion causing the proximal end of said blade to contact said tapered portion along a circle; a plurality of radially adjustable spring members that extends from a central hole at an end of said sleeve; and a shaft within said sleeve that has a portion that extends from said central hole, said extending portion having the shape of a right truncated cone that pushes said members into contact with the interior surface of said blade.
Claim 2
Dependent Claim
121 words
A corneal punch for cutting a portion of the cornea of an eye, comprising: a sleeve with an outer portion that has a conical taper, said sleeve being adapted for insertion within a hollow cylindrical blade that has a cutting edge at its distal end, said insertion causing the proximal end of said blade to contact said tapered portion along a circle; a plurality of radially adjustable spring members that extends from a central hole at an end of said sleeve; and a shaft within said sleeve that has a portion that extends from said central hole, said extending portion having the shape of a right truncated cone that pushes said members into contact with the interior surface of said blade.
Claim 3
Dependent Claim
24 words
The corneal punch of claim 1 wherein said members are three in number and have equal angular spacing about the axis of said sleeve.
Claim 4
Dependent Claim
18 words
The corneal punch of claim 1 wherein said conical tapered portion is at said end of said sleeve.
Claim 5
Dependent Claim
26 words
The corneal punch of claim 1 wherein said conical tapered portion and said right truncated cone define angles of approxiamtely 35 degrees and 65 degrees, respectively.
Claim 6
Dependent Claim
17 words
The corneal punch of claim 1 additionally comprising means for adjusting the length of said extending portion.
Claim 7
Dependent Claim
121 words
A corneal punch for cutting a portion of the cornea of an eye, comprising: a sleeve with an outer portion that has a conical taper, said sleeve being adapted for insertion within a hollow cylindrical blade that has a cutting edge at its distal end, said insertion causing the proximal end of said blade to contact said tapered portion along a circle; a plurality of radially adjustable spring members that extends from a central hole at an end of said sleeve; means connected to said sleeve for maintaining said spring members in contact with an interior surface of said blade; a work surface having a concave shape; and means for maintaining said sleeve in a coaxial relationship with said work surface.
Claim 8
Dependent Claim
121 words
A corneal punch for cutting a portion of the cornea of an eye, comprising: a sleeve with an outer portion that has a conical taper, said sleeve being adapted for insertion within a hollow cylindrical blade that has a cutting edge at its distal end, said insertion causing the proximal end of said blade to contact said tapered portion along a circle; a plurality of radially adjustable spring members that extends from a central hole at an end of said sleeve; means connected to said sleeve for maintaining said spring members in contact with an interior surface of said blade; a work surface having a concave shape; and means for maintaining said sleeve in a coaxial relationship with said work surface.
References Cited (Backward Citations)
US493730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |