US4267841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nail matrix trephine
Assignee: Individual
•
Filing: 1978-12-22
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Granted: 1981-05-19
•
Expires: 1998-12-22
Abstract
Abstract A nail matrix trephine includes clamping head for clamping the trephine to a nail plate and a guide head for guiding a trephine cutter. The clamping head and guide head are interconnected by means of an adjustment device so that when the clamping head is clamped to the nail plate the guide head is adjusted relative thereto so that the trephine cutter is guided to remove preselected nail matrix cells.
Inventors
- 👤 Alexander R. Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:52
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/32053; A61B17/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A nail-matrix trephine adapted to be attached to a nail plate of a toe or finger for removing unwanted nail-matrix cells, including a clamping head comprising a hooked nail engaging member adapted to be located beneath a nail plate, a clamping member mounted on said clamping head and adapted to co-operate with said hooked nail engaging member to firmly attach said clamping head to said nail plate and clamp alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head adapted for supporting and guiding trephine cutter means mounted thereon, and adjustable means interconnecting said clamping head and said guide head, wherein the adjustable means includes guide rails on which said clamping head and said guide head are moveable one relative to the other and further including a screw for moving said heads one relative to the other; wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
Claim 2
Dependent Claim
185 words
A nail-matrix trephine adapted to be attached to a nail plate of a toe or finger for removing unwanted nail-matrix cells, including a clamping head comprising a hooked nail engaging member adapted to be located beneath a nail plate, a clamping member mounted on said clamping head and adapted to co-operate with said hooked nail engaging member to firmly attach said clamping head to said nail plate and clamp alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head adapted for supporting and guiding trephine cutter means mounted thereon, and adjustable means interconnecting said clamping head and said guide head, wherein the adjustable means includes guide rails on which said clamping head and said guide head are moveable one relative to the other and further including a screw for moving said heads one relative to the other; wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
Claim 3
Dependent Claim
16 words
A nail matrix trephine as claimed in claim 1, wherein said clamping member comprises a screw.
Claim 4
Dependent Claim
27 words
A nail-matrix trephine as claimed in claim 1, wherein said alignment means on said hooked nail engaging member comprises a surface of said hooked nail engaging member.
Claim 5
Dependent Claim
24 words
A nail-matrix trephine as claimed in claim 1, wherein said trephine cutter means comprises a screw having a cutting surface at one end thereof.
Claim 6
Dependent Claim
137 words
A nail-matrix trephine adapted to be attached to nail plate of a toe or finger for removing unwanted nail-matrix cells, including a clamping head comprising a hooked nail engaging member, a screw mounted on said clamping head co-operating with said hooked nail engaging member to firmly attach said clamping head to said nail plate, and alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head supporting and guiding a trephine cutter means mounted therein, and guide rails and an adjustable means interconnecting said clamping head and said guide head, wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
Claim 7
Dependent Claim
137 words
A nail-matrix trephine adapted to be attached to nail plate of a toe or finger for removing unwanted nail-matrix cells, including a clamping head comprising a hooked nail engaging member, a screw mounted on said clamping head co-operating with said hooked nail engaging member to firmly attach said clamping head to said nail plate, and alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head supporting and guiding a trephine cutter means mounted therein, and guide rails and an adjustable means interconnecting said clamping head and said guide head, wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
Claim 8
Dependent Claim
140 words
A nail-matrix trephine adapted to be attached to a nail plate of a toe or finger for removing unwanted nail matrix cells, including a clamping head comprising a hooked nail engaging member, a screw mounted on said clamping head which co-operates with said hooked nail engaging member to firmly attach said clamping head to said nail plate, and clamp alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head supporting and guiding a trephine cutter means mounted thereon, and guide rails and a screw interconnecting said clamping head and said guide head, wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
Claim 9
Dependent Claim
140 words
A nail-matrix trephine adapted to be attached to a nail plate of a toe or finger for removing unwanted nail matrix cells, including a clamping head comprising a hooked nail engaging member, a screw mounted on said clamping head which co-operates with said hooked nail engaging member to firmly attach said clamping head to said nail plate, and clamp alignment means on said hooked nail engaging member for aligning said clamping head on said nail plate, a guide head supporting and guiding a trephine cutter means mounted thereon, and guide rails and a screw interconnecting said clamping head and said guide head, wherein upon clamping and aligning said clamping head to said nail plate the position of said guide head is adjusted so that when said trephine cutter means is advanced a selected portion of the nail-matrix cells is removed.
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |