Source: http://www.google.co.uk/patents/US5702395
Timestamp: 2013-05-21 21:20:12
Document Index: 586781980

Matched Legal Cases: ['art 41', 'art 42', 'arts 41', 'art 43', 'art 41', 'art 43', 'art 42', 'art 41', 'art 42', 'art 42', 'art 41', 'art 42']

Patent US5702395 - Spine osteosynthesis instrumentation for an anterior approach - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Web History | Sign inAdvanced Patent SearchPatentsThe instrumentation comprises at least two blocks (1) adapted to transversely interconnect two rigid rods (2, 3) axially slidable in these blocks which are provided with bone anchorage screws (7, 8) suitable oriented and slides (4, 5) which are slidable in longitudinal recesses (6, 7) receiving the respective...http://www.google.co.uk/patents/US5702395?utm_source=gb-gplus-sharePatent US5702395 - Spine osteosynthesis instrumentation for an anterior approachPublication numberUS5702395 APublication typeGrantApplication number08/433,500Publication date30 Dec 1997Filing date10 Nov 1993Priority date10 Nov 1992InventorsChristoph HopfOriginal AssigneeSofamor S.N.C.Sofamor, S.N.C.U.S. Classification606/250606/265International ClassificationA61B17/70A61B19/00Cooperative ClassificationA61B17/7032A61B17/7044A61B2019/307A61B17/7002European ClassificationA61B 17/70B8ReferencesPatent Citations (8)Referenced by (103)External LinksUSPTOUSPTO AssignmentEspacenetSpine osteosynthesis instrumentation for an anterior approachUS 5702395 AAbstract The instrumentation comprises at least two blocks (1) adapted to transversely interconnect two rigid rods (2, 3) axially slidable in these blocks which are provided with bone anchorage screws (7, 8) suitable oriented and slides (4, 5) which are slidable in longitudinal recesses (6, 7) receiving the respective rods (2, 3) which may be in this way clamped by the slides after the latter have been completely closed. Each block (1) has in the transverse direction from the anterior part to the posterior part a curved general shape corresponding to the antero-lateral anatomy of the vertebral bodies, the interior surface being consequently concave while the exterior surface is convex. The instrumentation obtained by the assembly of two blocks (1), anchorage screws and stiffening rods (2, 3) forms a very stable rectangular structure restoring the axial continuity of the vertebral column, avoiding correction losses and facilitating the consolidation of the bone graft.
What is claimed is: 1. Spinal osteosynthesis instrumentation for an anterior approach, said instrumentation comprising: two elongated rods; at least two blocks for transversely interconnecting said rods, said blocks defining openings for receiving said rods therein in such manner that said rods are axially slidable and revolvable about themselves in said blocks; means slidably disposed within said blocks and bearing against said rods for clamping said rods against rotation and translation relative to said blocks; and wherein each block has an anterior part and a posterior part and a generally curved shape in a transverse direction from said anterior part to said posterior part corresponding to the antero-lateral anatomy of vertebral bodies, said block defining a concave interior surface configured to contact a vertebral body and a convex exterior surface.
3. Instrumentation according to claim 1, wherein each block defines two recesses each receiving a respective rod; and said means for clamping includes a slide for each of said recesses, each slide being longitudinally slidably mounted in the respective longitudinal recess and becoming clamped on the respective rod at the end of the travel of said slide along the respective recess.
4. Instrumentation according to claim 3, wherein each slide is provided with inclined lateral flanges, complementary lateral grooves are provided in the respective recess, said inclined lateral flanges being engageable in said complementary lateral grooves, inclined clamping ramps are provided in said grooves, said flanges being cooperative with said clamping ramps, said ramps having an angle of inclination of substantially 2
19. Spinal osteosynthesis instrumentation for an anterior approach, said instrumentation comprising: two elongated rods; at least two blocks for transversely interconnecting said rods, said blocks defining openings for receiving said rods therein in such manner that said rods are axially slidable and revolvable about themselves in said blocks; means slidably disposed within said blocks and bearing against said rods for clamping said rods against rotation and translation relative to said blocks; a pair of anchorage screws for each of said blocks; and wherein each block defines two recesses each receiving respective one of said rods and a pair of bores each intersecting a corresponding one of said recesses, said means for clamping includes a slide for each of said recesses, each slide being longitudinally slidably mounted in the respective longitudinal recess and becoming clamped on the respective rod at the end of the travel of said slide along the respective recess, and said pair of anchorage screws each being inserted through a corresponding one of said pair of bores for each of said blocks.
20. Instrumentation according to claim 19, wherein said pair of anchorage screws are each supported in a respective one of said pair of bores to subtend an angle between said pair of screws for each of said blocks, said angle being substantially 25
23. Spinal osteosynthesis instrumentation for an anterior approach, said instrumentation comprising: two elongated rods; at least two blocks for transversely interconnecting said rods, said blocks defining openings for receiving said rods therein in such manner that said rods are axially slidable and revolvable about themselves in said blocks; means slidably disposed within said blocks and bearing against said rods for clamping said rods against rotation and translation relative to said blocks; and wherein said block is curved in such manner as to have in cross-section a substantially S-shape having one half which constitutes an anterior part and a second half constituting a posterior part, said anterior part having a thickness which is less than the thickness of said posterior part and being capable of being inserted in a cavity provided for this purpose in the vertebral body.
26. Spinal osteosynthesis instrumentation for engaging at least two elongated rods to the anterior aspect of the spine, comprising: a block having a longitudinal length and defining two longitudinal recesses along said longitudinal length, each of said recesses configured to receive a rod therein and defining a longitudinal axis; means for clamping the rods within each of said recesses, said means including a slide disposed in each of said recesses, said slide being slidably mounted in a respective longitudinal recess for travel from one end of said recess toward an opposite end of said recess, said slide clamping a rod within said respective longitudinal recess along the travel of said slide; and wherein said block is formed from a unitary piece to define a fixed transverse distance separating said two recesses from each other.
27. Spinal osteosynthesis instrumentation according to claim 26, wherein: said block defines an opening between said two recesses, said opening communicating through a lateral passage with at least one of said recesses; and said instrumentation further includes a screw engageable within said opening and having a conical portion configured to extend through said lateral passage when said screw is engaged within said opening, whereby said conical portion bears against said slide disposed within said at least one of said recesses.
29. Spinal osteosynthesis instrumentation for engaging at least two elongated rods to the anterior aspect of the spine, comprising: a block having a longitudinal length and defining two longitudinal recesses along said longitudinal length, each of said recesses configured to receive a rod therein and defining a longitudinal axis; means for clamping the rods within each of said recesses, said means including a slide disposed in each of said recesses, said slide being slidably mounted in a respective longitudinal recess for travel from one end of said recess toward an opposite end of said recess, said slide clamping a rod within said respective longitudinal recess along the travel of said slide; and wherein said block defines at least one lateral groove along each of said elongated recesses and each of said slides includes at least one lateral flange complementary with and slidable within a corresponding lateral groove.
31. Spinal osteosynthesis instrumentation according to claim 30, wherein said clamping ramp defined in each of said recesses is inclined at substantially 2 said recess.
33. Spinal osteosynthesis instrumentation for an anterior approach, comprising: a first elongated rod; a second elongated rod having a diameter less than the diameter of said first elongated rod; a block for transversely connecting said first and second rods adjacent the spine, said block defining a first elongated recess configured to receive said first rod therein and a second elongated recess configured to receive said second rod therein; and means for clamping said first and second rod within said first and second recess, respectively, against rotation and translation relative to said block.
34. Spinal osteosynthesis instrumentation for engaging the anterior aspect of a patient's spine, comprising: a first spinal rod configured for fixation along the patient's spine; a second spinal rod configured for fixation along the patient's spine adjacent to said first rod; a block transversely interconnecting said first and second spinal rods, said block defining a first elongated recess configured to receive said first rod and a second elongated recess configured to receive said second rod; a first slide configured to slidingly engage said first recess to clamp said first rod between said first slide and said block when said first rod is received in said first recess; and a second slide configured to slidingly engage said second recess to clamp said second rod between said second slide and said block when said second rod is received in said second recess.
35. Spinal osteosynthesis instrumentation according to claim 34, wherein: said block defines a first lateral groove along said first recess and a second lateral groove along said second recess; said first slide includes a first flange for slidingly engaging said first groove; and said second slide includes a second flange for slidingly engaging said second groove.
36. Spinal osteosynthesis instrumentation according to claim 35, wherein: said first lateral groove defines a first clamping ramp inclined relative to a longitudinal axis of said block, said first lateral flange being cooperative with said first clamping ramp to clamp said first lateral flange within said first recess; and said second lateral groove defines a second clamping ramp inclined relative to said axis, said second lateral flange being cooperative with said second clamping ramp to clamp said second lateral flange within said second recess.
39. Spinal osteosynthesis instrumentation according to claim 38, wherein said block defines a second bore intersecting said second recess and further comprising a second anchorage screw inserted through said second bore, said first and second anchorage screws subtending an angle therebetween of about 25
40. Spinal osteosynthesis instrumentation according to claim 34, wherein: said block defines an opening between said first and second recesses, said opening communicating through a lateral passage with at least one of said first and second recesses; and said instrumentation further includes a screw engageable within said opening and having a conical portion configured to extend through said lateral passage when said screw is engaged within said opening, whereby said conical portion bears against at least one of said first and second slides when disposed within a corresponding one of said first and second recesses.
Each block 1, 2 is also provided with a pair of bone anchorage screws 8, 10 which may be placed in position by inserting them in corresponding bores 9, 11 provided in the bottom of the recesses 6 and 7. The bores 9, 11, and therefore the screws 8, 10, have suitable inclinations so that the two screws converge at a suitable angle, preferably on the order of 25
The flanges 17, 18 and 19, 20 are inclined at a suitable angle A (FIG. 2) on the bottom of the recesses 6, 7 in the same way as their respective lateral grooves 15a . . . 16b which have for this purpose ramps of the same inclination A as the flanges 17 . . . 20. Thus the progressive insertion of each slide 4, 5 in the corresponding recess 6, 7 in the direction of the arrows (FIGS. 1 and 4) results in a progressive gripping of the flanges 17, 18 and 19, 20 in their grooves 15a, 16a . . . and finally the clamping of the slides in the recesses 6, 7. The inclinations of the flanges (17 . . . 20) are inverted on the slides 4 and 5 so that the latter are inserted in the recesses 6, 7 in opposite directions indicated by the arrows (FIGS. 1 and 4) to obtain a technical result which will be explained hereinafter. The angle of inclination A of the flanges 17, 18 and 19, 20 and of the ramps may be between about 2 6
In the second embodiment of the invention shown in FIGS. 8 to 13, each block 40 has a generally bent shape so as to have an approximately S-shaped cross-section. The two halves 41 and 42 of the block 40 respectively constitute its posterior and anterior parts, the posterior part 41 having a thickness e1 greater than the thickness e2 of the anterior part 42. The two parts 41, 42 are interconnected by a central part 43 which extends in a general direction P substantially perpendicular to the plane P1 of the bottom of the recess 44 of the posterior part 41. On the other hand, the general direction P in which the central part 43 extends makes an angle B of less than 90 of the sides of the bottom of the recess 45 of the anterior part 42. As in the blocks 1, semi-cylindrical channels 46, 47 are provided in the bottom of the respective recesses 44, 45 and complementary channels 46a, 47a in the slides 4, 5, the diameters of said channels corresponding to those of the rods 2 and 3. Bores 48, 49 are provided in the bottom of the channels 46, 47 for receiving anchorage screws 10 and 8 respectively. Note that in FIGS. 8 and 9 the entry chamfers 50, 51 of the recesses 44 and 45 facilitate the insertion of the corresponding slides 4, 5. Further, the arrangement of the block 40 is similar to that of the block 1, the same reference numerals being used for the corresponding parts in both cases.
When the component parts of this instrumentation have been assembled (FIGS. 11 and 12), the anchorage screws 10 and 8 respectively extend through the posterior part 41 and anterior part 42 and make an angle therebetween on the order of 35 in a vertebral recess 52 (FIG. 13) produced by the surgeon and opening onto the anterior part of the vertebra, for example L3 or L1. Thus the anterior part 42 of the clip-block 40 is inserted in the vertebral region. The angle between the posterior part 41 and anterior part 42 (corresponding to the angle between the two planes P1 and P2) affords additional safety to the surgeon bearing in mind the proximity of the large vessels in the anterior approach.
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