Patent EP0499037A2 successfully refreshed from Google Patents.
EP0499037A2
Expired / Lapsed
EP
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Spinal fixator reduction frame
Assignee: MTG Divestitures LLC
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Filing: 1992-01-15
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Granted: —
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Expires: 2012-01-15
Abstract
Abstract A reduction frame (50) according to the present invention is secured to shaft handles (14) extending from the pedicle screws (12) of a Vermont Spinal Fixator type implant. Shaft clamps secure two T-handles (100) of the reduction frame to the shaft handles. A lower-rod assembly (200) joins the two opposite T-frames by means of lower-rod clamps. The shaft clamps (122) are provided with four degrees of freedom. The joint between the lower-rod assembly (200) and T-handle (100) is provided with five degrees of freedom. The lower-rod assembly (200) and the T-handle (100) are provided with power screw threads (212) to allow for precise translational control. The shaft clamps (122) and lower-rod clamps are provided with taper fit joints (130) to allow for infinite rotational adjustment and fixture. An upper-rod assembly (300) is also provided on the T-handles (100) to produce rotation of the T-handles (100) by providing means for changing the distance between the upper ends of the T-handles (100). Finger grips (318) are provided on the upper-rod assembly to allow the surgeon to easily use one hand to either apply or monitor the force acting along the upper-rod (300).
Inventors
- 👤 Martin H. Krag
- 👤 John S. Crombie
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 16:35
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7074; A61B17/7076; A61B17/7077
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
77 words
A device for producing realignment of vertebrae affected by various spinal disorders, including fractures and dislocations, wherein vertebrae adjacent to and on opposite sides of the affected location are provided with two generally dorsally extending screws, one screw on each side of the spinous process, said device comprising two members extending dorsally with respect to the spine, each of said members linking the two screws provided in one vertebrae, thereby providing handles for manipulation of the spine.
Claim 2
Dependent Claim
55 words
The device according to claim 1, wherein: the dorsally extending members are T-shapes, inverted with respect to the spine, said members each having a dorsally extending threaded leg and two laterally extending arms; and said dorsally extending members further comprise clamping members disposed on said arms for clampingly engaging the vertebrae screws or extensions thereof.
Claim 3
Dependent Claim
27 words
The device according to claim 1 further comprising first adjustable means for alternately rigidly connecting the dorsally extending members and providing controlled mechanical alignment of the spine.
Claim 4
Dependent Claim
64 words
The device according to claim 3 wherein said first adjustable means comprises: a rigid threaded member; two clamping members slidable on said rigid member, one each clampingly engaging one of the dorsally extending members; and screw means associated with each clamping member for alternately providing controlled translational movement of said clamping members along said threaded member and fixing said clamping members at desired positions.
Claim 5
Dependent Claim
27 words
The device according to claim 4 wherein at least one of the clamping members clampingly engage the dorsally extending members with three possible rotational degrees of freedom.
Claim 6
Dependent Claim
32 words
The device according to claim 3, wherein each dorsally extending member comprises means for controlled, generally dorsal-ventral translation of the connection points between the dorsally extending members and said first adjustable means.
Claim 7
Dependent Claim
112 words
The device according to claim 6, wherein: the dorsally extending members are T-shapes, inverted with respect to the spine, said members each having a dorsally extending threaded leg and two laterally extending arms; said dorsal-ventral translation means comprises a sleeve slidable on the threaded leg and connected to the first adjustable means, and screw means associated with each sleeve for alternately providing controlled translational movement of said sleeves along the threaded legs and fixing said sleeves at a desired position; and said dorsally extending members further comprise a hinged extensions of said laterally extending arms, and clamping members disposed on said hinged extensions for clampingly engaging the vertebrae screws or extensions thereof.
Claim 8
Dependent Claim
25 words
The device according to claim 7, wherein the clamping members clampingly engage the vertebrae screws or extensions thereof with three possible rotational degrees of freedom.
Claim 9
Dependent Claim
39 words
The device according to claim 3, further comprising second adjustable means linking the dorsally extending members for controlled application of force on said members to provide rotation of said members about the connection point of said first adjustable means.
Claim 10
Dependent Claim
68 words
The device according to claim 9, wherein the second adjustable means comprises: a threaded rod; and nut members disposed on said threaded rod and bearing against the dorsally extending members, whereby rotation of said nut members allows infinitely controllable application of force to the dorsally extending members thereby causing rotation about the connection point of the first adjustable means and thus transmission of the force to the vertebrae.
Claim 11
Dependent Claim
32 words
The device according to claim 10, wherein the second adjustable means further comprises finger grips disposed on the threaded rod for facilitating manual application of force and human sensitivity to force applied.
Claim 12
Independent Claim
172 words
A device for the realignment of a dislocated spine, comprising: two rigid members, each member removably attachable to the spine in a dorsally extending orientation on either side of the dislocation, each member being attachable to a single vertebrae at two points, one point on each side of the spinous process; first adjustable means installable on said rigid members for linking said rigid members when attached to the spine, including threaded means for alternately providing a rigid connection between said members and mechanically applying controlled forces to said members, said first adjustable means being capable of cooperating with said rigid members alone to provide pure distraction-compression forces on the spine; and second adjustable means installable on said rigid members for mechanically applying controlled forces to said rigid members, said second means disposed dorsally with respect to said first means when said rigid members are attached to the spine, whereby the spine may be aligned with varying degrees of mechanical control by selectively installing and utilizing said first and second means as desired.
Claim 13
Dependent Claim
65 words
The device according to claim 12 wherein said first adjustable means comprises: a rigid threaded member; two clamping members freely slidable on said threaded member, one each clampingly engaging one of the dorsally extending members; and screw means associated with each clamping member for alternately providing controlled translational movement of said clamping members along said threaded member and fixing said clamping members at desired positions.
Claim 14
Dependent Claim
87 words
The device according to claim 12, wherein the second adjustable means comprises: a threaded rod; nut members disposed on said threaded rod and bearing against the dorsally extending members, whereby rotation of said nut members allows infinitely controllable application of force to the dorsally extending members thereby causing rotation about the linkage point of the first adjustable means and thus transmission of force to the spine; and finger grip means disposed on said threaded rod for facilitating manual application of force and human sensitivity to force applied.
Claim 15
Independent Claim
71 words
An apparatus, comprising: a T-shaped rigid member having a threaded leg and two arms; extension members pivotally connected to an end of each of said arms; and two clamp members, one each clampingly engaging one of said extension members opposite the pivotable connection, said clamp members each separately capable of additionally clampingly engaging a shaft-like member at an orientation different from the orientation said extension members with respect to said apparatus.
Claim 16
Dependent Claim
145 words
The apparatus according to claim 15, further comprising: a first sleeve member with two ends disposed on said threaded leg and slidable thereon; two nuts disposed on said threaded leg, one each adjacent an end of said first sleeve member whereby selective rotation of said nuts alternately provides translation or fixation of said sleeve member on said threaded leg; a rigid threaded rod; a second sleeve member with two ends disposed on said threaded rod and slidable thereon; two nuts disposed on said threaded rod, one each adjacent an end of said second sleeve member whereby selective rotation of said nuts alternately provides translation or fixation of said second sleeve member on said threaded rod; and a clamp member having two clamping collars rotatable with respect to each other, one collar clampingly engaging said second sleeve and the other collar clampingly engaging said first sleeve.
Claim 17
Dependent Claim
35 words
The apparatus according to claim 16, further comprising: an eye socket extending from the first sleeve; a second threaded rod; and a nut disposed on said second threaded rod and bearing against said eye socket.
Claim 18
Dependent Claim
59 words
The apparatus according to claim 17, wherein: said two clamp members clampingly engaging said extension members each comprise two clamping collars rotatable with respect to each other; and all clamp members having two collars have one collar provided with a frustoconical projection and a second collar defining a complimentary frustoconical recess for receiving said projection with an interference fit.
Claim 19
Independent Claim
306 words
An apparatus, comprising: two T-shaped rigid members, each having a threaded leg and two arms; extension members pivotally connected to an end of each of said arms; four first clamp members, each having two clamping collars rotatable with respect to each other, one member each clampingly engaging one of said extension members opposite the pivotable connection, said first clamp members each separately capable of additionally clampingly engaging a shaft-like member at an orientation different from the orientation of said extension members with respect to said apparatus; two first sleeve members each with two ends, one sleeve member disposed on each of said threaded legs and slidable thereon; two nuts disposed on each said threaded leg, one each adjacent an end of each said first sleeve members whereby selective rotation of said nuts alternately provides translation or fixation of said first sleeve members on said threaded legs; a rigid threaded rod extending between said T-shaped members; a second sleeve member and a third sleeve member each with two ends disposed on said threaded rod and slidable thereon; four nuts disposed on said threaded rod, one each adjacent an end of one of said second and third sleeve members whereby selective rotation of said nuts alternately provides translation or fixation of said second and third sleeve member on said threaded rod; a second clamp member, having two clamping collars rotatable with respect to each other, one collar clampingly engaging said second sleeve and the other collar clampingly engaging one first sleeve; a clamping collar clampingly engaging the other first sleeve and cooperating with said third sleeve in a manner alternately allowing rotation and fixation; an eye socket extending from each first sleeve member; a second threaded rod extending between the T-shaped members; and two nuts disposed on said second threaded rod, one each bearing against said eye sockets.
References Cited (Backward Citations)
No citation records indexed.
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