Source: http://www.google.fr/patents/US7645295?hl=fr&ie=ISO-8859-1
Timestamp: 2015-04-21 13:11:08
Document Index: 42953248

Matched Legal Cases: ['art 36', 'art 36', 'art 50', 'art 36', 'art 36', 'art 36']

Brevet US7645295 - Method for postoperatively compressing a bone graft - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus »Connexion Recherche avanc�e dans les brevets BrevetsA method for postoperatively compressing a bone graft between adjacent spinal vertebrae utilizing first and second plates having openings at remote ends for receiving bone screws to fix the plates to respective vertebrae on opposite sides of a bone graft-receiving site. The first and second plates have...http://www.google.fr/patents/US7645295?utm_source=gb-gplus-shareBrevet US7645295 - Method for postoperatively compressing a bone graft Recherche avanc�e dans les brevets Num�ro de publicationUS7645295 B2Type de publicationOctroi Num�ro de demandeUS 11/165,056 Date de publication12 janv. 2010 Date de d�p�t24 juin 2005 Date de priorit�8 janv. 2002�tat de paiement des fraisPay�Autre r�f�rence de publicationUS6932820, US8002810, US20030130661, US20050240184, US20100137909 Num�ro de publication11165056, 165056, US 7645295 B2, US 7645295B2, US-B2-7645295, US7645295 B2, US7645295B2 InventeursSaid G. Osman Cessionnaire d'origineSaid G. OsmanExporter la citationBiBTeX, EndNote, RefManCitations de brevets (39), Citations hors brevets (25), R�f�renc� par (9), Classifications (12), �v�nements juridiques (1) Liens externes: USPTO, Cession USPTO, EspacenetMethod for postoperatively compressing a bone graft
US 7645295 B2 R�sum�
1. A method for postoperatively compressing a bone graft between adjacent spinal vertebrae comprising the steps of:
securing a first plate of a spinal fixation device to a vertebra adjacent one side of a bone graft;
securing a second plate of the spinal fixation device to a vertebra adjacent an opposite side of the bone graft, said first and second plates having respective first and second sets of lateral interlocking elements cooperable with one another to enable progressive postoperative advancement of the plates toward one another and to lock the plates to one another in a plurality of advanced positions precluding movement of the plates away from one another in each said advanced positions for progressively compressing the bone graft between the adjacent vertebrae, one of said first and second plates including a flexing mechanism for flexing movement of one of said first and second sets of lateral interlocking elements toward and away from another of said first and second sets of lateral interlocking elements to enable the progressive advancement and locking of said plates to one another;
wherein said flexing mechanism is part of a male projection and comprises a pair of legs and a slot therebetween, and wherein said flexing movement further comprises flexing said legs toward and away from one another in response to movement of the vertebrae toward one another
interlocking said respective first and second sets of lateral interlocking elements of said first and second plates in a first position relative to one another;
postoperatively advancing the plates from said first position toward one another into a second position relative to one another in response to movement of the vertebrae toward one another; and
locking the plates to one another in said second advanced position, thereby precluding movement of the plates away from one another post-locking.
2. The method according to claim 1, further comprising incrementally advancing and locking the plates toward one another in response to movement of the vertebrae toward one another, reducing a distance between the plates at each increment.
3. The method according to claim 1, wherein said first and second sets of lateral interlocking elements comprise ratchet teeth, wherein postoperatively advancing the plates further comprises ratcheting the plates one ratchet tooth at a time in a first direction, and wherein cooperating sloped surfaces of said ratchet teeth on each of said plates prevent return movement of the plates in a second direction away from one another, thereby providing a uni-directional incremental movement of the plates post-operation.
4. The method according to claim 1, wherein said first and second sets of lateral interlocking elements of said first and second plates are constructed in a tongue and groove arrangement along the plane of said plates.
5. The method according to claim 4 wherein postoperatively advancing the plates further comprises ratcheting said along said tongue and groove arrangement, wherein said tongue and groove arrangement extends only a portion of said spinal fixation device.
providing a plurality of projections laterally along a portion of said first plate and a plurality of recesses laterally along a portion of said second plate; and
biasing said projections laterally relative to said recesses to enable incremental movement of the first and second plates in a first direction toward one another while preventing movement of said first and second plates in a second direction away from one another.
7. The method according to claim 1 wherein said first plate comprises a male projection, wherein said second plate comprises a female recess for receiving the male projection of said first plate, said male projection and said female recess lying generally coplanar with one another, and wherein said first and second sets of lateral interlocking elements are positioned along margins of said male projection of said first plate and said female recess of said second plate for cooperably precluding the first and second plates from movement in a direction away from one another.
providing a stop cooperable between said first and second plates for preventing further relative movement of said first and second plates toward one another in response to postoperative movement of the vertebrae toward one another.
forming said first and second plates curved in directions normal to one another.
aligning said plates with one another in the direction of movement of the plates toward one another; and
providing cooperable guides on said first and second plates to prevent displacement of said plates relative to one another.
providing a channel along a margin of said first plate for receiving a margin of said second plate.
12. A method for postoperatively compressing a bone graft between adjacent spinal vertebrae comprising the steps of:
securing a second plate of the spinal fixation device to a vertebra adjacent an opposite side of the bone graft, said first and second plates having respective first and second sets of lateral interlocking elements cooperable with one another to enable progressive postoperative advancement of the plates toward one another and to lock the plates to one another in a plurality of advanced positions precluding movement of the plates away from one another in each said advanced position for progressively compressing the bone graft between the adjacent vertebrae, one of said first and second plates including a flexing mechanism for flexing movement of one of said first and second sets of lateral interlocking elements toward and away from another of said first and second sets of lateral interlocking elements to enable the progressive advancement and locking of said plates to one another;
engaging said first and second plates, wherein a spacer is positioned between said first and second plates to prevent movement of said first and second plates in a first direction toward one another and wherein said first and second sets of lateral interlocking elements of said first and second plates prevent movement of said first and second plates in a second direction away from one another, thereby locking said first and second plates in a first position relative to one another;
removing said spacer from between said first and second plates; and
postoperatively advancing the first and second plates incrementally from said first position toward one another within a predetermined range of uni-directional dynamic movement.
13. The method according to claim 12, wherein postoperatively advancing the first and second plates toward one another further comprises ratcheting said first and second plates in said first direction to reduce a linear distance between said first and second plates.
14. The method according to claim 12, wherein said first and second sets of lateral interlocking elements comprise ratchet teeth, wherein cooperating sloped surfaces of said ratchet teeth prevent return movement of said first and second plates in said second direction away from one another.
15. The method according to claim 12, wherein postoperatively advancing the first and second plates incrementally from said first position toward one another further comprises advancing the first and second plates toward one another through a series of advanced positions from said first position and precluding movement of said first and second plates away from one another in each of said series of advanced positions. Description
This application is a division of application Ser. No. 10/038,682 filed Jan. 8, 2002, now U.S. Pat. No. 6,932,820 the entire content of which is hereby incorporated by reference in this application.
The second or inferior plate 16 includes a female part defining a recess 50 at an end thereof remote from the openings 44. The recess 50 receives the male part 36 of the first plate 14. The openings 44 receive, bone graft screws 46 for securing the second plate 16 to the inferior vertebra 20 on the opposite side 12 of the bone graft-receiving site 22 from vertebra 18. The lateral margins of the recess 50 have interlocking elements, i.e., ratchet teeth 39, which cooperate with and are complementary shaped relative to the ratchet teeth 38 of the male part. Temporarily disposed between the first and second plates 14 and 16 is a spacer 60. The spacer 60 maintains the first and second plates spaced from one another during the course of surgery and serves to aid in proper positioning of the first and second plates relative to one another. It will be appreciated that the male and female parts may be reversed, i.e., the male part 36 may be formed on the inferior plate 16 and the female part 50 may be formed on the superior plate 14.
More particularly, when advanced, the teeth 38 and 39 cooperate with one another to prevent return movement of the plates in a direction away from one another. This dynamic uni-directional movement of the places toward one another and the locking of the plates in progressively advanced positions responsive movement of the patient's head anteriorly, to thus progressively displaces the adjacent vertebrae 18 and 20 toward one another thereby enabling the bone graft to be maintained under compression between the adjacent vertebrae 18 and 20. Depending upon the distance of travel allowable for the plates relative to one another for each stepwise advance, periodic continued movement of the patient's head in a forward direction, as when nodding, will cause further ratcheting action with consequent advantageous and beneficial compression of the bone graft between the adjacent vertebrae. It will be appreciated that the ratchets have very fine teeth and the movement is incremental, the teeth in the drawing figures being enlarged and exaggerated to demonstrate the concept. It will also be appreciated that the slit 40 separating the legs of the male part permit the legs to flex toward and away from one another, enabling the plates to incrementally advance toward one another.
Referring now to the embodiment hereof illustrated in FIGS. 5 and 6, wherein like reference numerals are applied to like parts as in the preceding embodiment, followed by the suffix a, the interlocking elements may comprise a plurality of teeth 70 projecting laterally from the male par 36 a of the first plate 14 a. The teeth 70 are maintained biased laterally outwardly by springs 72 disposed in recesses 74 in the male part 36 a. Thus, it will be seen that a plurality of teeth 70 project laterally outwardly from opposite sides of the male part 36 a under the bias of springs 72. Rather than individual springs 72, alternate means to bias the teeth outwardly may be provided. For example, the teeth on each side may be interconnected to one another along a base lying in a channel with a wave spring biasing the base and hence the teeth laterally outwardly. As a further alternative, surgical resilient material may be employed behind each tooth 70 or behind a gang of teeth located in a channel along each side of the male part 36 a to provide the lateral outward bias.
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