Patent US4572212A successfully refreshed from Google Patents.
Patent US3717146A successfully refreshed from Google Patents.
US3717146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded intramedullary compression and fixation device
Assignee: Individual
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Filing: 1971-02-01
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Granted: 1973-02-20
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Expires: 1991-02-01
Abstract
Abstract An intramedullary compression and fixation device for compressing a long bone of a predetermined length which has been fractured medially to form first and second bone segments. The compression and fixation device includes an elongated intramedullary rod of sufficient length to project from one end of the bone past the fracture site and which is formed with a cross section of sufficient size to substantially occupy the cross section of the medial portion of the medullary canal of the bone. Peripheral thread means are formed on such rod and are of sufficient size to engage the cancellous bone forming the interior wall of the medullary canal to drive the rod axially in such canal upon rotation of the rod. Coupling threads are formed on one end of the rod for connection with an intramedullary rod driver-retractor device whereby an opening may be formed in one end of the bone and the end of the rod opposite the one end passed through the open end, the driver-retractor device engaged with the coupling threads and such device rotated to screw the rod through the one bone segment and into the second bone segment to thereby span the fracture and maintain the bone segments in fixed relationship with respect to one another.
Inventors
- 👤 W Halloran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:09
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
In a threaded intramedullary compression and fixation device for compressing a long bone having a medullary canal of a predetermined length and cross section and which has been fractured medially to form first and second bone segments, the improvement comprising: an elongated intramedullary rod of sufficient length to project from one end of said bone past said fracture and formed with a fixation area having a cross section of sufficient size to project substantially across the transverse cross section of the medial portion of said medullary canal; peripheral bone-engaging thread means on said fixation area of sufficient size to engage cancellous bone forming the wall of said medullary canal in the area of said fracture site; and coupling means on one end of said rod whereby rod driverretractor device may be coupled with said coupling means and after said fracture has been set and while it is held compressed, said compression and fixation device may be inserted into said intramedullary canal from one end thereof and said driver-retractor device rotated to engage said thread means with said cancellous bone forming said intramedullary canal thus resulting in said rod spanning said fracture site with said thread means engaging said cancellous bone in both said bone segments to hold said segments in fixed relationship to maintain said fracture compressed.
Claim 2
Dependent Claim
217 words
In a threaded intramedullary compression and fixation device for compressing a long bone having a medullary canal of a predetermined length and cross section and which has been fractured medially to form first and second bone segments, the improvement comprising: an elongated intramedullary rod of sufficient length to project from one end of said bone past said fracture and formed with a fixation area having a cross section of sufficient size to project substantially across the transverse cross section of the medial portion of said medullary canal; peripheral bone-engaging thread means on said fixation area of sufficient size to engage cancellous bone forming the wall of said medullary canal in the area of said fracture site; and coupling means on one end of said rod whereby rod driverretractor device may be coupled with said coupling means and after said fracture has been set and while it is held compressed, said compression and fixation device may be inserted into said intramedullary canal from one end thereof and said driver-retractor device rotated to engage said thread means with said cancellous bone forming said intramedullary canal thus resulting in said rod spanning said fracture site with said thread means engaging said cancellous bone in both said bone segments to hold said segments in fixed relationship to maintain said fracture compressed.
Claim 3
Dependent Claim
217 words
In a threaded intramedullary compression and fixation device for compressing a long bone having a medullary canal of a predetermined length and cross section and which has been fractured medially to form first and second bone segments, the improvement comprising: an elongated intramedullary rod of sufficient length to project from one end of said bone past said fracture and formed with a fixation area having a cross section of sufficient size to project substantially across the transverse cross section of the medial portion of said medullary canal; peripheral bone-engaging thread means on said fixation area of sufficient size to engage cancellous bone forming the wall of said medullary canal in the area of said fracture site; and coupling means on one end of said rod whereby rod driver-retractor device may be coupled with said coupling means and after said fracture has been set and while it is held compressed, said compression and fixation device may be inserted into said intramedullary canal from one end thereof and said driver-retractor device rotated to engage said thread means with said cancellous bone forming said intramedullary canal thus resulting in said rod spanning said fracture site with said thread means engaging said cancellous bone in both said bone segments to hold said segments in fixed relationship to maintain said fracture compressed.
Claim 4
Dependent Claim
217 words
In a threaded intramedullary compression and fixation device for compressing a long bone having a medullary canal of a predetermined length and cross section and which has been fractured medially to form first and second bone segments, the improvement comprising: an elongated intramedullary rod of sufficient length to project from one end of said bone past said fracture and formed with a fixation area having a cross section of sufficient size to project substantially across the transverse cross section of the medial portion of said medullary canal; peripheral bone-engaging thread means on said fixation area of sufficient size to engage cancellous bone forming the wall of said medullary canal in the area of said fracture site; and coupling means on one end of said rod whereby rod driver-retractor device may be coupled with said coupling means and after said fracture has been set and while it is held compressed, said compression and fixation device may be inserted into said intramedullary canal from one end thereof and said driver-retractor device rotated to engage said thread means with said cancellous bone forming said intramedullary canal thus resulting in said rod spanning said fracture site with said thread means engaging said cancellous bone in both said bone segments to hold said segments in fixed relationship to maintain said fracture compressed.
Claim 5
Dependent Claim
29 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said rod is of sufficient length to project substantially the full length of said bone.
Claim 6
Dependent Claim
35 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said rod includes a plurality of through, transverse, screw-receiving passages for receiving transverse screws inserted through the wall of said bone.
Claim 7
Dependent Claim
34 words
A threaded intramedullary compression and fixation device as set forth in claim 1 for use in a femur wherein said rod is of sufficient length to project substantially the full length of said femur.
Claim 8
Dependent Claim
23 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said rod is regularly shaped in its longitudinal direction.
Claim 9
Dependent Claim
33 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said rod is greater than three-eighths of an inch in cross section and is at least 15 inches long.
Claim 10
Dependent Claim
26 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said rod is one-half inch in cross section and 19 inches long.
Claim 11
Dependent Claim
35 words
A threaded intramedullary compression and fixation device as set forth in claim 1 that includes coupling means on the end of said rod opposite said one end for connection with an intramedullary rod driver-retractor device.
Claim 12
Dependent Claim
24 words
A threaded intramedullary compression and fixation device as set forth in claim 1 wherein said thread means forms a lead greater than 1 inch.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |