US3633583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orthopedic single-blade bone cutter
Assignee: Individual
•
Filing: 1969-08-22
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Granted: 1972-01-11
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Expires: 1989-08-22
Abstract
Abstract A surgical rotary bone cutter having a rotary cutter head shaped as a substantially hemispherical surface of revolution coaxial with its axis of rotation and being longitudinally and medially split into two halves by a diametrical slot intersecting the axis of rotation. A single flat blade having a longitudinally curved edge is positioned in the slot and projects marginally beyond said surface of revolution. The blade edge is oppositely beveled on opposite sides of its midpoint to form two longitudinally curved rotatable shearing edges. A channel for conveying cuttings from the shearing edges is formed in the head alongside each shear edge. The cutter head may be formed as a concave or a convex hemispherical surface.
Inventors
- 👤 Meyer Fishbein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:16
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1664; A61B17/1666; A61B17/1668; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/909
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
194 words
A surgical rotary bone cutter comprising: a rotary cutter head having a substantially hemispherical surface of revolution coaxial with its axis of rotation, said head being longitudinally and medially spit into two halves by a diametrical slot intersecting its axis of rotation; and a single flat blade positioned in said slot and formed with a longitudinally curved edge positioned to project marginally beyond said surface of revolution; said blade edge being oppositely beveled on opposite sides of its midpoint to form two longitudinally curved rotatable shear edges, each formed with a clearance angle; said head having sunk therein, below said surface of revolution, and alongside each of said shear edges, a channel for conveying cuttings from said shearing edges, each of said channels beginning at a point located ahead of the midpoint of the blade and extending from there past said midpoint and along its corresponding shear edge to a cuttings discharge outlet, so as to assure reception of cuttings from the center area of the sockets and to convey these cuttings away and thereby avoid packing of cuttings between the bottom-center region of the socket and the center portions of the shear edges.
Claim 2
Dependent Claim
194 words
A surgical rotary bone cutter comprising: a rotary cutter head having a substantially hemispherical surface of revolution coaxial with its axis of rotation, said head being longitudinally and medially spit into two halves by a diametrical slot intersecting its axis of rotation; and a single flat blade positioned in said slot and formed with a longitudinally curved edge positioned to project marginally beyond said surface of revolution; said blade edge being oppositely beveled on opposite sides of its midpoint to form two longitudinally curved rotatable shear edges, each formed with a clearance angle; said head having sunk therein, below said surface of revolution, and alongside each of said shear edges, a channel for conveying cuttings from said shearing edges, each of said channels beginning at a point located ahead of the midpoint of the blade and extending from there past said midpoint and along its corresponding shear edge to a cuttings discharge outlet, so as to assure reception of cuttings from the center area of the sockets and to convey these cuttings away and thereby avoid packing of cuttings between the bottom-center region of the socket and the center portions of the shear edges.
Claim 3
Dependent Claim
56 words
The subject matter of claim 1 wherein said head is substantially hemispherical, and wherein the discharge outlet of said cuttings channel opens through the rearward side of and inside the perimeter of said hemispherical head, whereby to convey away all cuttings from the socket and prevent packing of cuttings between the cutter head and the socket.
Claim 4
Dependent Claim
136 words
A surgical rotary bone cutter comprising: a rotary cutter head having a substantially hemispherical surface of revolution coaxial with its axis of rotation, said head being longitudinally and medially split into two halves by a diametrical slot intersecting its axis of rotation; and, a single flat blade positioned in said slot and formed with a longitudinally curved edge positioned to project marginally beyond said surface of revolution; said blade edge being oppositely beveled on opposite sides of its midpoint to form two longitudinally curved rotatable shear edges, each formed with a clearance angle; said oppositely beveled portions of said blade edge meeting at the midpoint of the blade, at the axis of rotation of the cutter, to terminate in two angular end edges which intersect at angles opposite to one another at said axis of revolution.
Claim 5
Dependent Claim
136 words
A surgical rotary bone cutter comprising: a rotary cutter head having a substantially hemispherical surface of revolution coaxial with its axis of rotation, said head being longitudinally and medially split into two halves by a diametrical slot intersecting its axis of rotation; and, a single flat blade positioned in said slot and formed with a longitudinally curved edge positioned to project marginally beyond said surface of revolution; said blade edge being oppositely beveled on opposite sides of its midpoint to form two longitudinally curved rotatable shear edges, each formed with a clearance angle; said oppositely beveled portions of said blade edge meeting at the midpoint of the blade, at the axis of rotation of the cutter, to terminate in two angular end edges which intersect at angles opposite to one another at said axis of revolution.
Claim 6
Dependent Claim
39 words
A surgical cutter as defined in claim 1, wherein said surface of revolution is in the form of a substantially hEmispherical cavity, and said shearing edges are on a concave curve lying inside said surface of said hemispherical cavity.
Claim 7
Dependent Claim
62 words
The surgical cutter of claim 4, wherein said head is in the form of a cup having merging side and bottom wall portions with said substantially hemispherical cavity formed therein, and including a pair of grooves sunk in the interior surface of said wall portions, alongside said shearing edges, and terminating in exit slots extending through said wall portions of said cup.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |