Patent US3300288A successfully refreshed from Google Patents.
Patent US710021A successfully refreshed from Google Patents.
Patent US5613971A successfully refreshed from Google Patents.
US5613971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratcheting tibial and femoral guide
Assignee: DePuy Orthopaedics Inc
•
Filing: 1995-08-11
•
Granted: 1997-03-25
•
Expires: 2015-08-11
Abstract
Abstract A bone drill guide having at least a first arm slidable within a bore of the body of the drill guide and a ratchet mechanism for locking the first arm and the first bore. The ratchet mechanism includes teeth on the first arm and a pawl biased along a first axis and having a continuous engagement edge for engaging the teeth of the first arm for any angular orientation of the pawl about the first axis. The continuous engagement edge is a curve in a plane transverse to the first axis for providing a substantially renewable point contact with the teeth. The recess includes side walls tapered towards the engagement edge to allow a narrow contact at the engagement edge and re-enforce face walls to absorb the axial forces of the guide.
Inventors
- 👤 Jerry L. Lower
- 👤 John Balestrieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:48
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/17; A61B17/1714; A61B17/1739; A61B17/1764
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
99 words
A guide for a bone drilling tool comprising: a body having first and second arms positioned to secure the tool to a bone; said first arm slides within a first bore in said body; a ratchet for locking said first arm in said first bore, said ratchet including teeth on said first arm and a pawl in said body biased along a first axis to engage said teeth; and said pawl being rotatable about said first axis and including a continuous engagement edge for lockingly engaging said teeth for all angular orientations of said pawl about said first axis.
Claim 2
Dependent Claim
99 words
A guide for a bone drilling tool comprising: a body having first and second arms positioned to secure the tool to a bone; said first arm slides within a first bore in said body; a ratchet for locking said first arm in said first bore, said ratchet including teeth on said first arm and a pawl in said body biased along a first axis to engage said teeth; and said pawl being rotatable about said first axis and including a continuous engagement edge for lockingly engaging said teeth for all angular orientations of said pawl about said first axis.
Claim 3
Dependent Claim
26 words
A guide according to claim 1, wherein said pawl is cylindrical with a recess in a first end of a first diameter forming said engagement edge.
Claim 4
Dependent Claim
51 words
A guide according to claim 2, wherein: said pawl includes a head at its second end of a second diameter greater than the first diameter of the first end; and said body includes a second bore having first and second portions of third and fourth diameters and joined by a shoulder.
Claim 5
Dependent Claim
33 words
A guide according to claim 3, wherein said third and fourth diameters are sufficiently greater than said first and second diameters respectively to allow said pawl to cant transverse to said first axis.
Claim 6
Dependent Claim
17 words
A guide according to claim 2, wherein said recess includes side walls tapered towards said engagement edge.
Claim 7
Dependent Claim
26 words
A guide according to claim 1, wherein said first arm rotates in said first bore and includes teeth on only a portion of its transverse periphery.
Claim 8
Dependent Claim
16 words
A guide according to claim 1, wherein said first arm is hollow for receiving a drill.
Claim 9
Dependent Claim
55 words
A guide according to claim 1, wherein said second arm slides within a second bore in said body and includes teeth; and including a second pawl in said body biased along a second axis and having a continuous engagement edge for engaging said teeth for any angular orientation of said pawl about said second axis.
Claim 10
Dependent Claim
17 words
A guide according to claim 1, wherein said first and second arms are transverse to each other.
Claim 11
Dependent Claim
14 words
A guide according to claim 1, wherein said first and second arms are collinear.
Claim 12
Dependent Claim
28 words
A guide according to claim 1, wherein said engagement edge is curved in a plane transverse to said first axis for engaging said teeth at a renewable point.
Claim 13
Dependent Claim
96 words
A guide for a bone drilling tool comprising: a body having first and second arms positioned to secure the tool to a bone; said first arm slides within a first bore in said body; a ratchet for locking said first arm in said first bore, said ratchet including teeth on said first arm and a pawl in said body biased along a first axis; and said pawl being rotatable about said first axis and including an engagement edge curved in a plane transverse to said first axis for lockingly engaging said teeth at a renewable point.
Claim 14
Dependent Claim
96 words
A guide for a bone drilling tool comprising: a body having first and second arms positioned to secure the tool to a bone; said first arm slides within a first bore in said body; a ratchet for locking said first arm in said first bore, said ratchet including teeth on said first arm and a pawl in said body biased along a first axis; and said pawl being rotatable about said first axis and including an engagement edge curved in a plane transverse to said first axis for lockingly engaging said teeth at a renewable point.
Claim 15
Dependent Claim
26 words
A guide according to claim 12, wherein said pawl is cylindrical with a recess in a first end of a first diameter forming said engagement edge.
Claim 16
Dependent Claim
51 words
A guide according to claim 13, wherein: said pawl includes a head at its second end of a second diameter greater than the first diameter of the first end; and said body includes a second bore having first and second portions of third and fourth diameters and joined by a shoulder.
Claim 17
Dependent Claim
33 words
A guide according to claim 14, wherein said third and fourth diameters are sufficiently greater than said first and second diameters respectively to allow said pawl to cant transverse to said first axis.
Claim 18
Dependent Claim
17 words
A guide according to claim 13, wherein said recess includes side walls tapered towards said engagement edge.
Claim 19
Dependent Claim
26 words
A guide according to claim 12, wherein said first arm rotates in said first bore and includes teeth on only a portion of its transverse periphery.
Claim 20
Dependent Claim
16 words
A guide according to claim 12, wherein said first arm is hollow for receiving a drill.
Claim 21
Dependent Claim
56 words
A guide according to claim 12, wherein said second arm slides within a second bore in said body and includes teeth; and including a second pawl in said body biased along a second axis and having an engagement edge curved in a plane transverse to said second axis for engaging said teeth at a renewable point.
Claim 22
Dependent Claim
28 words
A guide according to claim 12, wherein said engagement edge is curved in a plane transverse to said first axis for engaging said teeth at a renewable point.
References Cited (Backward Citations)
US4034746A
Cited
US4254763A
Cited
US4344420A
Cited
US5000163A
Cited
US5163940A
Cited
US5350380A
Cited
US5354300A
Cited
US5312412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-24 | 2000-09-23 | 2001-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-24 | 2004-09-23 | 2005-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-24 | 2008-09-23 | 2009-03-25 | $7700.00 | Window Closed / Lapsed |