US5690634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medullary drill head
Assignee: Synthes USA LLC
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Filing: 1996-01-25
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Granted: 1997-11-25
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Expires: 2016-01-25
Abstract
Abstract A drill head for intramedullary drilling has a front part, a middle part and a rear part and is shaped as a hollow body of revolution. The front and rear parts have spiral slots formed with cutting edges. The rear part has an attachment for coupling to a drilling shaft.
Inventors
- 👤 Christof Muller
- 👤 Peter Christen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:07
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/164; A61B17/1613; A61B17/1615; A61B17/56; A61B17/58; A61B17/68; A61B17/72
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
A drill head for drilling out the medulla of a tubular bone comprising a hollow body of revolution having a front part, a middle part and a rear part, each of the front and rear parts having spiral slots with cutting edges, the middle part providing an area free from slots separating the slots of the front and rear parts from one another and the rear part having coupling means for attachment to a drill.
Claim 2
Dependent Claim
75 words
A drill head for drilling out the medulla of a tubular bone comprising a hollow body of revolution having a front part, a middle part and a rear part, each of the front and rear parts having spiral slots with cutting edges, the middle part providing an area free from slots separating the slots of the front and rear parts from one another and the rear part having coupling means for attachment to a drill.
Claim 3
Dependent Claim
18 words
The drill head claimed in claim 1 wherein the front part has the shape of a truncated cone.
Claim 4
Dependent Claim
18 words
The drill head claimed in claim 2 wherein the rear part has the shape of a truncated cone.
Claim 5
Dependent Claim
25 words
The drill head claimed in claim 3 wherein each spiral slot occupies a sector of the body of revolution of about 60° to about 100°.
Claim 6
Dependent Claim
16 words
The drill head claimed in claim 4 wherein the sector is about 80° to about 100°.
Claim 7
Dependent Claim
16 words
The drill head claimed in claim 1 wherein the cutting edges face toward the coupling means.
Claim 8
Dependent Claim
37 words
The drill head claimed in claim 6 wherein the drill head has a central axis and the spiral slots are inclined to the axis of the drill head at an angle of about 20° to about 40°.
Claim 9
Dependent Claim
28 words
The drill head claimed in claim 7 wherein the spiral slots are inclined to the axis of the drill head at an angle of about 25° to 35°.
Claim 10
Dependent Claim
23 words
The drill head claimed in claim 1 wherein the front part comprises two spiral slots extending into the middle part, about 180° apart.
Claim 11
Dependent Claim
23 words
The drill head claimed in claim 9 wherein the rear part comprises two spiral slots extending into the middle part, about 180° apart.
Claim 12
Dependent Claim
22 words
The drill head claimed in claim 1 wherein the front part has three slots about 120° apart extending into the middle part.
Claim 13
Dependent Claim
22 words
The drill head claimed in claim 11 wherein the rear part has three slots, about 120° apart extending into the middle part.
Claim 14
Dependent Claim
23 words
The drill head claimed in claim 1 wherein the body of revolution comprises a shell from about 0.5 to about 2 mm thick.
Claim 15
Dependent Claim
19 words
The drill head claimed in claim 13 wherein the shell is from about 0.8 to about 1.2 mm thick.
Claim 16
Dependent Claim
24 words
The drill head claimed in claim 1 and comprising openings in the front part and in the rear part for receiving a guide wire.
Claim 17
Dependent Claim
22 words
The drill head claimed in claim 1 wherein at least 50% of the total volume of the body of revolution is hollow.
Claim 18
Dependent Claim
22 words
The drill head claimed in claim 16 wherein at least 70% of the total volume of the body of revolution is hollow.
References Cited (Backward Citations)
US3320957A
Cited
US5100426A
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US5122134A
Cited
US5196024A
Cited
US5203653A
Cited
US5366468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-24 | 2001-05-26 | 2001-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-24 | 2005-05-26 | 2005-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-24 | 2009-05-26 | 2009-11-25 | $7700.00 | Window Closed / Lapsed |