US3916907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spreader instrument for use in performing a spinal fusion
Assignee: Individual
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Filing: 1974-06-21
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Granted: 1975-11-04
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Expires: 1994-06-21
Abstract
Abstract A spreader instrument for use in spinal fusion surgery for separating adjacent vertebral bodies having a common bone assembly receiving hole pre-formed therein includes two elongated members pivotally attached intermediate their ends. A pair of partial-circularly shaped plates are attached to the pivoted members, extending outwardly from adjacent opposite free ends of the respective members. The plates are oriented with their concave faces toward each other to be adapted to be inserted into the pre-formed holes within the vertebral bodies. The plates engage the walls of the pre-formed hole in the bodies and spreads or separates the bodies as the members are pivoted, permitting a cylindrically shaped bone assembly to be axially inserted between the semi-circular plates into the hole in the vertebral bodies.
Inventors
- 👤 Wendell C Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
A; A61; A61F; A61F17/00; A61B; A61B17/00; A61B17/02; A61B17/025; A61B17/28; A61B17/2812; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61F2/446; A61B2017/0256; A61F2/442; A61F2/28; A61F2002/2835; A61F2002/2839; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30224; A61F2002/30225; A61F2002/30316; A61F2002/30329; A61F2002/30433; A61F2002/30535; A61F2002/30599; A61F2220/00; A61F2220/0025; A61F2220/0041; A61F2230/00; A61F2230/0063; A61F2230/0069; A61F2250/00; A61F2250/0058; A61F2250/006; A61F2250/0063; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53683
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A spreader for separating vertebral bodies having a hole preformed therein to receive a cylindrical plug comprising, two pivotally attached elongated members, and two frustro-conically shaped curved plates, each rigidly attached to a respective one of said members, each of said plates having a first outside radius to engage the wall of said hole, and having a second inside radius smaller than said first radius for passing the bone plug, said first and second radii being upon a common center line oriented at an angle of approximately 30* from an axis along said respective elongated member.
Claim 2
Dependent Claim
96 words
A spreader for separating vertebral bodies having a hole preformed therein to receive a cylindrical plug comprising, two pivotally attached elongated members, and two frustro-conically shaped curved plates, each rigidly attached to a respective one of said members, each of said plates having a first outside radius to engage the wall of said hole, and having a second inside radius smaller than said first radius for passing the bone plug, said first and second radii being upon a common center line oriented at an angle of approximately 30* from an axis along said respective elongated member.
Claim 3
Dependent Claim
22 words
The spreader of claim 1 further comprising biasing means between said members to urge said plates in a direction toward each other.
Claim 4
Dependent Claim
65 words
The spreader of claim 1 wherein said plates are mounted with their centerline axes oriented at an angle with resPect to the axis of said members, and are disposed on said elongated members to be symmetrical about a centerline axis with respect to each other when the interior faces of said plates are separated by a distance approximately equal to the diameter of said plug.
Claim 5
Dependent Claim
17 words
The spreader of claim 3 wherein the material of which the spreader is formed is stainless steel.
Claim 6
Dependent Claim
116 words
A spreader for separating two vertebral bodies having a pre-formed bone plug receiving hole, comprising: a pair of elongated members, pivot means medially interconnecting said pair of elongated members, a pair of frustro-conically shaped arcuate plates, each rigidly attached to and outstanding from adjacent an end of a respective one of said members, each plate being of inside radius of approximately 5/8 of an inch to pass said bone plug and of outside radius of approximately 1/2 of an inch to engage one of said vertebral bodies, the center line axis of each of said plates defining an angle of about 30* with respect to the axis of the elongated member upon which it is mounted.
Claim 7
Dependent Claim
116 words
A spreader for separating two vertebral bodies having a pre-formed bone plug receiving hole, comprising: a pair of elongated members, pivot means medially interconnecting said pair of elongated members, a pair of frustro-conically shaped arcuate plates, each rigidly attached to and outstanding from adjacent an end of a respective one of said members, each plate being of inside radius of approximately 5/8 of an inch to pass said bone plug and of outside radius of approximately 1/2 of an inch to engage one of said vertebral bodies, the center line axis of each of said plates defining an angle of about 30* with respect to the axis of the elongated member upon which it is mounted.
Claim 8
Dependent Claim
22 words
The spreader of claim 5 wherein each of said pair of arcuate plates is of approximately 3/4 of an inch in length.
Claim 9
Dependent Claim
22 words
The spreader of claim 5 wherein each of said elongated members are bent at an angle of about 30* upon its axis.
Claim 10
Dependent Claim
18 words
The spreader of claim 7 further comprising biasing means between said elongated members normally urging said plates together.
Claim 11
Dependent Claim
17 words
The spreader of claim 8 wherein the material of which the spreader is formed is stainless steel.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |