US5035697A
Expired / Lapsed
US
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Orthopedic medullary nail
Assignee: Synthes USA LLC
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Filing: 1990-07-03
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Granted: 1991-07-30
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Expires: 2010-07-03
Abstract
Abstract A tibia medullary pin for the treatment of lower-leg fractures of all kinds has an anterior half (1), a posterior half (2), a proximal end segment (3), and a distal end segment (4), with the longitudinal axes (5;6) of the two end segments (3;4) forming in the antero-posterior plane an angle of 5°-13° with each other. The proximal end segment (3) has a cross-section area (7) that is trigonal in both the anterior (1) and the posterior (2) halves, and overall is approximately rhombic, while the distal end segment (4) has a cross-section area (8) that is approximately trigonal in the anterior half (1) and is approximately semi-spherical in the posterior half (2).
Inventors
- 👤 Robert Frigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:41
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7283
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A medullary nail for the tibia having an anterior half, a posterior half, a proximal end segment having a longitudinal axis, and a distal end segment having a longitudinal axis, the axes of the proximal and distal end segments meeting at an angle in the anterior-posterior plane of from about 5° to about 13°, the posterior and anterior halves of the proximal end segment being generally trigonal in cross section and the cross section of the proximal end segment, as a whole, being generally rhombic, the anterior half of the distal end segment being generally trigonal in cross section and the posterior half being generally semi-circular in cross section.
Claim 2
Dependent Claim
109 words
A medullary nail for the tibia having an anterior half, a posterior half, a proximal end segment having a longitudinal axis, and a distal end segment having a longitudinal axis, the axes of the proximal and distal end segments meeting at an angle in the anterior-posterior plane of from about 5° to about 13°, the posterior and anterior halves of the proximal end segment being generally trigonal in cross section and the cross section of the proximal end segment, as a whole, being generally rhombic, the anterior half of the distal end segment being generally trigonal in cross section and the posterior half being generally semi-circular in cross section.
Claim 3
Dependent Claim
24 words
The tibia medullary nail claimed in claim 1, wherein the trigonal anterior cross-section of the distal end segment is rounded off toward the anterior.
Claim 4
Dependent Claim
31 words
The tibia medullary nail claimed in claim 1, wherein the length of the proximal end segment is between about 30 and about 35%, of the entire length of the medullary nail.
Claim 5
Dependent Claim
26 words
The tibia medullary nail claimed in claim 3, wherein the proximal end segment is between about 33% and about 34% of the length of the nail.
Claim 6
Dependent Claim
25 words
The tibia medullary nail claimed in claim 1, wherein the thickness of proximal end segment, measured in antero-posterior direction, continuously diminishes from proximal to distal.
Claim 7
Dependent Claim
44 words
The tibia medullary nail claimed in claim 1 where the thickness of the proximal end segment in the antero-posterior direction decreases from about 12 to about 13 mm at its proximal end to from about 8 to about 9 mm at its distal end.
Claim 8
Dependent Claim
29 words
The tibia medullary nail according to claim 1, wherein the maximum diameter of the distal end segment, measured in antero-posterior direction, remains essentially the same from proximal to distal.
Claim 9
Dependent Claim
13 words
The tibia medullary nail claimed in claim 1 wherein both segments are solid.
Claim 10
Dependent Claim
19 words
The tibia medullary nail claimed in claim 1, wherein the proximal end segment has at least one bolt hole.
Claim 11
Dependent Claim
19 words
The tibia medullary nail claimed in claim 1, wherein the distal end segment has at least one bolt hole.
Claim 12
Dependent Claim
19 words
The tibia medullary nail claimed in claims 6 or 7, wherein the bolt holes run in the medio-lateral direction.
Claim 13
Dependent Claim
21 words
The tibia medullary nail claimed in claim 1, wherein the distal end segment has at its tip a step posteriorly oriented.
Claim 14
Dependent Claim
30 words
The tibia medullary nail claimed in claim 1, wherein the longitudinal axes of the two end segments form in the antero-posterior plane an angle of from about 7° to 11°.
Claim 15
Dependent Claim
31 words
The tibia medullary nail claimed in claim 13 wherein the longitudinal axes of the two end segments form in the antero-posterior plane an angle of from about 8° to about 10°.
References Cited (Backward Citations)
FR1031128A
Cited
CA987983A
Cited
US4630601A
Cited
US4589883A
Cited
US4667663A
Cited
US4678471A
Cited
US4898186A
Cited
US4846162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |