US6159210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone fixation pin with rotary cutting tip
Assignee: Research Corp Technologies Inc
•
Filing: 1998-01-14
•
Granted: 2000-12-12
•
Expires: 2018-01-14
Abstract
Abstract A fixation pin and methods for attaching an immobilizing device or frame to a bone or to the skull of a patient with a skeletal injury are provided. A preferred embodiment of the pin comprises an externally threaded cylindrical body having on its leading end a shoulder and a smaller diameter coaxial cylindrical post with a rotary cutting tip on its face. The post fits snugly into a hole drilled into the bone by the cutting tip without the need for a high axial force to insert and hold the post in place. Drilling the hole with a rotary cutting tip on the face of the post minimizes lateral damage to the bone. The minimal lateral bone damage and the low axial force provide for a low incidence of pin loosening and side effects such as infections secondary to loosening and headaches. The shoulder limits the depth of penetration of the cutting tip into the bone. A crescent shaped halo utilizing the fixation pin is also provided.
Inventors
- 👤 Michael J. Voor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:42
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/8635; A61B17/60; A61B17/64; A61B17/6433; A61B90/00; A61B90/10; A61B90/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
40 words
A bone fixation pin, comprising: a cylindrical post having a post diameter, a base and a face; a rotary cutting tip formed on said face; a shoulder extending radially outward from said base; and a body attached to said base.
Claim 2
Dependent Claim
40 words
A bone fixation pin, comprising: a cylindrical post having a post diameter, a base and a face; a rotary cutting tip formed on said face; a shoulder extending radially outward from said base; and a body attached to said base.
Claim 3
Dependent Claim
35 words
The fixation pin of claim 1 wherein said cutting tip comprises a cutting edge formed by an intersection of a rotationally leading surface and a rotationally trailing surface, said surfaces contained within said post diameter.
Claim 4
Dependent Claim
28 words
The fixation pin of claim 1 wherein said body includes a cylindrical section having a body diameter, said cylindrical section attached to said base coaxially with said post.
Claim 5
Dependent Claim
20 words
The fixation pin of claim 3 wherein said body includes a surface formed on said body within said body diameter.
Claim 6
Dependent Claim
12 words
The fixation pin of claim 3 wherein said shoulder comprises a flange.
Claim 7
Dependent Claim
31 words
The fixation pin of claim 3 further comprising a tapered section formed on said body adjacent to said shoulder, said shoulder having a shoulder diameter not limited to said body diameter.
Claim 8
Dependent Claim
16 words
The fixation pin of claim 3 further comprising a screw thread formed on said cylindrical section.
Claim 9
Dependent Claim
14 words
The fixation pin of claim 7 further comprising self-tapping flutes formed in said body.
Claim 10
Dependent Claim
18 words
The fixation pin of claim 7 wherein a portion of said screw thread has a truncated cone shape.
Claim 11
Dependent Claim
16 words
The fixation pin of claim 1 further comprising a coupling feature for rotating said fixation pin.
Claim 12
Dependent Claim
14 words
The fixation pin of claim 10 wherein said coupling feature is a screwdriver slot.
Claim 13
Dependent Claim
25 words
The fixation pin of claim 10 wherein said coupling feature comprises a surface formed on said body for connecting a rotating device to said pin.
Claim 14
Dependent Claim
19 words
The fixation pin of claim 7 wherein said rotary cutting tip has a diameter no greater than said post.
Claim 15
Dependent Claim
80 words
A bone fixation pin, comprising: a cylindrical post, having a base, a face and a post diameter; a rotary cutting tip formed on said face, said tip comprising a cutting edge formed by an intersection of a rotationally leading surface and a rotationally trailing surface, said surfaces contained within said post diameter; and a shoulder extending radially outward from said base; and a body having a cylindrical section with a body diameter, said cylindrical section attached coaxially to said post.
Claim 16
Dependent Claim
80 words
A bone fixation pin, comprising: a cylindrical post, having a base, a face and a post diameter; a rotary cutting tip formed on said face, said tip comprising a cutting edge formed by an intersection of a rotationally leading surface and a rotationally trailing surface, said surfaces contained within said post diameter; and a shoulder extending radially outward from said base; and a body having a cylindrical section with a body diameter, said cylindrical section attached coaxially to said post.
Claim 17
Dependent Claim
30 words
The fixation pin of claim 14 further comprising a tapered section formed on said body adjacent to said shoulder, said shoulder having a shoulder diameter not limited to body diameter.
Claim 18
Dependent Claim
16 words
The fixation pin of claim 14 further comprising a screw thread formed on said cylindrical section.
Claim 19
Dependent Claim
48 words
A method of attaching a halo to a skull, comprising the steps of: providing a fixation pin of claim 1 placing the halo around the skull; inserting the pin through the halo; rotating and advancing the cutting tip into the skull; and securing the pin to the halo.
Claim 20
Independent Claim
68 words
A method of attaching an external fixation frame to a bone, comprising the steps of: providing a fixation pin of claim I having a post diameter smaller than the body diameter, comprising: drilling a hole into a first side of the bone; threading the body into the hole; rotating and advancing the cutting tip into a second side of the bone; and attaching the pin to the frame.
Claim 21
Dependent Claim
11 words
The method of claim 18 wherein the screw threads are self-tapping.
Claim 22
Dependent Claim
51 words
A crescent halo, for attaching to a skull, comprising: a frame, for partially encircling said skull; a plurality of fixation pin holes in said frame for receiving and retaining a fixation pin according to claim 1; and a mounting feature on said frame for attaching said frame to an immobilizing device.
Claim 23
Dependent Claim
16 words
The crescent halo of claim 20 wherein said frame comprises a plurality of independently adjustable sections.
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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) | 2003-12-12 | 2004-06-12 | 2004-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-12 | 2008-06-12 | 2008-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-12 | 2012-06-12 | 2012-12-12 | $7700.00 | Window Closed / Lapsed |