WO2005027761A1 - Locking rachidial implant provided with a tightness indicator - Google Patents

Locking rachidial implant provided with a tightness indicator

Info

Publication number
WO2005027761A1
WO2005027761A1 PCT/FR2004/002346 FR2004002346W WO2005027761A1 WO 2005027761 A1 WO2005027761 A1 WO 2005027761A1 FR 2004002346 W FR2004002346 W FR 2004002346W WO 2005027761 A1 WO2005027761 A1 WO 2005027761A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
screw
mounting
locking
cap
portion
Prior art date
Application number
PCT/FR2004/002346
Other languages
French (fr)
Inventor
Maurice Bergoin
Original Assignee
Euros
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03Automatic limiting or abutting means, e.g. for safety
    • A61B2090/037Automatic limiting or abutting means, e.g. for safety with a frangible part, e.g. by reduced diameter

Abstract

The invention relates to a rachidial implant (100) consisting of an anchoring part (110), a mounting part (120) receiving a connecting rod (10) and clamping means (130) for blocking said connecting rod in the mounting part and comprising a ring (131) positioned on said mounting part, a threaded plug (132) screwable therein and a blocking screw (133). The inventive threaded plug and the ring are connected to each other before mounting on said mounting part. The threaded plug is screwed into the mounting part by means of the blocking screw which is screwed into said threaded plug and consists of a grasp head (133B) emerging from the threaded plug and provided with an indicator (133D) of the correct tightness of the threaded plug in the mounting part.

Description

Spinal implant locking means provided with a clamping control. The invention relates to a spinal implant comprising:

- an anchoring part to a vertebra,

- a mounting part comprising a tapped hole adapted to receive at its bottom a connecting rod extending from opposite sides of said mounting portion, and

- locking means adapted to cooperate with said mounting portion for locking said connecting rod within said tapped hole, these locking means comprising: o a ring intended to be positioned on said mounting portion, where a threaded plug intended to be screwed in said tapped hole of the mounting portion, and where a locking screw whose threaded shank is intended to be screwed through said screw cap to bear against said connecting rod. This type of implant assembled with a connecting rod is used to treat arthritis, vertebral fracture or to correct deviations of the spine such as scoliosis or kyphosis. In general, the surgeon implants by two fixed vertebrae then place in each of the implants a rod, these two rods being parallel and previously bent according to the treatment and the correction to be made on the spine. documents known EP 0465158 and US 6077262 implants whose characteristics correspond to those stated in the introduction. However, according to EP 0465158, the ring is a simple sleeve in place by sliding on the mounting part of the implant simultaneously with the screw cap, which is screwed inside the threaded housing. The screw cap has an annular flange which, when it is screwed into the mounting portion, bears against the annular edge of the ring to slide on said mounting portion and the block bearing on the connecting rod. In addition, the locking screw comprises, opposite its end which bears on the connecting rod, a simple hexagonal recess for inserting the tip of a screwing tool. The locking screw is of short length so that after screwing into the screw cap is completely inserted into said plug. The main disadvantage of these previously known implants is that the introduction of the screw cap into the housing of the mounting portion provided with the more or less curved connecting rod is often a difficult and delicate operation to be performed. Indeed, when the connecting rod is curved roughly positioned within the tapped hole of the mounting portion of this implant, it tends to rise off the housing by blocking access of the screw cap to the tapping of the housing. The surgeon must then press the stem with the screw cap by screwing thereof inside the housing and supporting said ring to slide on said mounting portion to cause said connecting rod to position themselves in the housing and the block within the latter with the screw cap and the ring. In some cases, when the shaft has an accentuated bending, it is possible that during the screwing of the screw cap into the threaded housing of the mounting portion, the thread of said cap breaks. Moreover, the surgeon is never sure that the screw cap is screwed in said tapped hole of the mounting portion of the implant with the proper torque. This threaded cap tightening operation is not an operation reproducible in the sense that the surgeon is never sure of tightening a plurality of threaded plugs of the same type with the same tightening torque. Finally, when the connecting rod has an accentuated bending the threads of the screw cap, not all come into engagement with the threads of the internal thread of the housing of the mounting part of the implant and the attachment of the connecting rod to the part of installation of the implant is fragile. Furthermore, it is known from document US 6224558 an implant which contains no ring, but a screw cap, and a locking screw whose threaded shank is intended to be screwed through said stopper to abut against the connecting rod. This locking screw comprises a gripping head which emerges from the cap and which is provided with a clamping control constituted by a portion of smaller resistor connecting the gripping head to the threaded body of the locking screw and rupturable by twisting under the effect of a given tightening torque. However as the implant according to US 6,077,262, in the implant according to US 6,224,598 the screw cap is first screwed into the mounting part of the implant before the locking screw therethrough intervenes -ci to immobilize the rod in said mounting part and it is not possible for the surgeon to control the clamping screw cap. In order to overcome the aforementioned drawbacks, the invention provides a spinal implant as defined in the introduction, characterized in that the screw cap and the ring are secured to one another before mounting on said mounting portion implant in that the threaded body of the locking screw is screwed in said screw cap to enable tightening of said threaded plug in said mounting part by means of said locking screw, and in that said locking screw to this end comprises a gripping head which emerges from said screw cap, and which is provided with a clamping control adapted to indicating to the surgeon that the screw cap is screwed into the mounting part of the implant to a given tightening torque Advantageously in this manner, the fastening operation of the screw cap in said mounting portion is a reproducible process readily controlled by the surgeon. According to another advantageous characteristic of the spinal implant of the invention, the locking screw is provided with a further clamping control. Preferably, this other clamping control is capable of signaling to the surgeon that the support locking screws on said connecting rod is screwed into said threaded cap in a given pair of clamping. Advantageously, this allows the surgeon to ensure that the latching or locking the connecting rod in the implant mounting portion is properly performed by said locking means. According to a preferred embodiment of the spinal implant of the invention, the other clamping control is a lower resistance portion that connects said gripping head to said threaded body of the locking screw and which is adapted to breaking by torsion under the effect of a given pair of clamping. Further according to this preferred embodiment of the spinal implant of the invention, said first clamping indicator is a ring surrounding the base of said gripper head of the locking screw, intended to rest on said threaded cap during screwing the threaded body of said locking screw into said threaded cap, and bound to said gripping head by a frangible connection adapted to be broken by shearing under the effect of a given tightening torque. Other non-limiting and advantageous features of the spinal implant of the invention are the following: - said threaded ring and said cap are two separate parts joined together by means of complementary locking means cooperating with each other, - the screw cap comprises a head adapted to be force fitted in said ring, - said ring has on its inner face an annular rim intended to bear against the upper edge of the mounting portion, - the screw cap comprises a head rim adapted to bear on the annular rim of said collar, - the screw cap and the ring form a single piece, - the said locking screw gripping head comprises at one end a receiving end of the imprint of a screwing tool, and - said locking screw is a single piece. The following description in the accompanying drawings, given by way of non-limiting example, explains in what the invention is and how it can be achieved. In the accompanying drawings:

- Figure 1 is a schematic perspective view of one embodiment of the spinal implant of the invention;

- Figure 2A is a perspective exploded view of the locking means of the spinal implant of Figure 1;

- Figure 2B is a longitudinally cut assembly view of the locking means of Figure 2A; and

- Figure 3 is a schematic perspective view of several spinal implant according to the invention placed on the vertebrae. Figures 1, 2A and 2B there is shown a spinal implant 100 having an anchor portion 110 to a vertebra. Here, the spinal implant 100 is a pedicle screw, the anchoring part is a threaded body 110 adapted to be anchored by screwing into the pedicle of the vertebra 1 in question (see figure 3). However, according to a not shown alternative embodiment, the spinal implant of the invention may be a pedicle hook, the anchor portion is a hook adapted to hang the pedicle of the vertebra considered. The spinal implant 100 further comprises a mounting portion 120 overcoming the anchor portion 110. The mounting portion 120 extends generally along the axis X of the anchor portion 110. It includes a tapped hole 121 open the side opposite the anchor portion 110 including opposed lateral openings 122 for receiving in its base 123 a connecting rod 10 which extends on either side of said mounting portion to link with one or several other spinal implants 100 of the same type (see Figure 3). Here the anchoring part 110 and the mounting portion 120 of the spinal implant 100 form a single piece. However, according to a variant not shown, may be provided that the anchoring parts and assembly of the implant are separate parts assembled together. In this case, the bottom of the tapped hole of the mounting portion has a through hole in which is engaged the head of the anchoring part. The spinal implant 100 further comprises locking means 130 for cooperating with said mounting portion 120 to lock the connecting rod 10 inside said threaded housing 121. As shown more particularly in Figures 2A and 2B, these locking means 130 comprise: - a collar 131 intended to be positioned on said mounting portion 120, - a cap 132 threaded to be screwed into said tapped hole 121 of the mounting portion 120, and - a locking screw 133 having a threaded body 133A to be screwed through said screw cap 132 for bearing against said connecting rod and the block to bear against the bottom 123 of the tapped hole 121 of the mounting portion 120 of the spinal implant 100. Figure 2B shows said lock means 130 of the spinal implant 100 ready for use before mounting on said mounting portion 120. Advantageously, according to the invention as shown in Figure 2B, the screw cap 132 and the ring 131 are secured to one another before mounting on said mounting portion 120 of the spinal implant 100. Here the screw cap 132 and ring 131 are two said parts separate assembled together by means of complementary locking means cooperating with each other. Préférentieliement, the screw cap 132 includes a head 132B which annular flange is adapted to be force-fitted in said ring 131. More particularly, the said ring 131 carries on its internal face 131 A 131 B an annular rim intended to bear against the upper edge of the mounting portion 120 of the spinal implant 100 and said annular flange 132B of said threaded plug 132 is adapted to bear on the annular flange 131 B of said ring 131. of course, according to a variant not shown, it may provide that the screw cap, and the ring form a single piece. According to another preferred characteristic of the spinal implant 100 according to the invention, as also shown in Figure 2B, before mounting on said mounting portion 120 of the implant, the threaded body 133A of the locking screw 133 is screwed in a conduit through 132A at least partially tapped said screw cap 132 so as to allow the clamping of the threaded plug 132 in the mounting portion 120 via the locking screw 133. for this purpose, the locking screw 133 comprises 133B a gripping head which emerges from the screw cap 132 and which is provided with a clamping control 133D. 133B the gripping head is in the shape of a drum of generally cylindrical about the axis X and comprises at one end accessible to a surgeon 133E footprint receiving the end of a screwing tool. Here the 133E footprint is a hexagon. The clamping 133D indicator is a ring which surrounds the base 133B of the gripping head of the locking screw and which is attached thereto by a frangible connection adapted to rupture by shearing under the effect of a torque given clamping. As shown in Figure 2B, the ring 133D carried by the gripping head 133 is designed to rest on said threaded cap 132 during the screwing of the threaded body 133A of the locking screw 133 in said screw cap 132. At its other end, the gripping head 133B is connected to the threaded body 133A of the locking screw 133 by a cylindrical portion 133C of weakness which is rupturable by torsion under the effect of a given pair of clamping. This cylindrical portion 133C of lower resistance is an indicator has ther tightening of the locking screw 133. Advantageously, the locking screw 133 is a single piece. The establishment of the spinal implant 100 to a vertebra 1 is performed by the surgeon in the following manner. The surgeon anchor the anchoring portion 110 of the implant into the vertebra so that it has access to its mounting portion 120. Then, it places with the aid of a tool such as the clamp shown in Figure 3, the connecting rod 10 more or less curved in the bottom 123 of the tapped hole 121 of said mounting portion 120. While holding the connecting rod 10 in place in the mounting portion 120 with the clamp, it takes with a screwing tool not shown the locking means 130 assembled in the manner shown in Figure 2B, that is to say, with the screw cap 132 secured to the ring 131 and the screw latch 133 screwed into said threaded plug 132 so that the ring 133D is supported on the latter, to screw the threaded plug 132 in the tapped hole 121 of the mounting portion 120 of the implant. During this screwing operation or tightening of the screw cap 132, the ring 131 slides on said mounting portion 120 and prevents the separation of its branches. The stop formed by the ring 133D bearing against the screw cap 132 is used to link said locking screws 133 to said threaded plug 132 so that the screwing of the locking screw 133 causes one of said threaded plug 132. The surgeon screws or greenhouse the screw cap 132 in said tapped hole 121 of the mounting portion 120 of the implant until the annular flange 131 B of the ring 131 abuts against the mounting portion 120 and the torque applied to the locking screw 133 and therefore transmitted to the screw cap causes shear failure of the frangible link connecting the ring 133D to said locking screw 133. the separation of the ring 133D indicates to the surgeon that the screw cap 132 is properly tightened to a torque given in the tapped hole 121 of the mounting portion 120 of the implant. This means in particular that all the threads of the thread of said threaded cap 132 cooperate or engage with the threads of the internal thread of said threaded housing 121. Then, the surgeon continues to screw the locking screw 133 into said threaded cap 132. Because the locking screw 133 is disengaged by rotation of the threaded plug 132, it passes through the latter to abut against the connecting rod 10 placed in the bottom 123 of the tapped hole 121 of the mounting portion 120. the surgeon then the greenhouse locking screw 133 into said threaded cap 132 until the torque applied to the locking screw 133 causes the rupture by twisting the portion 133C of weakness 133A connecting the threaded body of the locking screw 133 to its gripping head 133B. When this rupture took place, the locking of the implant 100 is completed and the connecting rod 10 is locked in translation and in rotation in the base 123 of the tapped hole 121 of the mounting part of the implant 100. The immobilization of the connecting rod 10 in said tapped hole 121 of the mounting portion 120 is carried out exclusively by the locking screw 133 as clamping or after the screw cap 132 or the ring 131 is in contact with said connecting rod. Such a spinal implant 100 assembled with the connecting rod 10 is used to treat arthritis, vertebral fracture or to correct deviations of the column such that a scoliosis or kyphosis. The present invention is not limited to the embodiment described and shown, but the skilled person can apply any variant within its spirit.

Claims

1. A spinal implant (100) comprises:
- an anchoring portion (110) to a vertebra, - a mounting portion (120) including a tapped hole (121) adapted to receive in its base (123) a connecting rod (10) extending on either side of said mounting portion (120), and
- locking means (130) for cooperating with said mounting portion (120) for locking said connecting rod (10) within said tapped hole (121), these locking means (130) comprising: o a ring (131) intended to be positioned on said mounting portion (120), o a threaded plug (132) intended to be screwed in said tapped hole (121) of the mounting portion (120), and o a locking screw (133) which the threaded body (133A.) is intended to be screwed through said screw cap (132) for bearing against said connecting rod (10), characterized in that the screw cap (132) and the ring ( 131) are integral with one another before mounting on said mounting portion (120) of the implant, in that the threaded body (132) of the locking screw (133) is screwed into said threaded cap ( 132) so as to allow the tightening of the screw cap (132) in the mounting portion (120) by the intermedi area of ​​the locking screw (133), and in that said locking screw (133) to this end comprises a gripping head (133B) which emerges from said threaded plug (132) and which is provided with a clamping control (133D) adapted to indicate to the surgeon that the screw cap (132) is screwed into the mounting part of the implant to a given tightening torque.
2. A spinal implant (100) according to claim 1, characterized in that the locking screw (133) is provided with another tightening control (133C).
3. A spinal implant (100) according to claim 2, characterized in that the other clamping witness part (133C) of weakness connecting said gripping head (133B) to said threaded body (133A) of the screw locking (133) and which is rupturable by torsion under the effect of a given pair of clamping.
4. A spinal implant (100) according to one of claims 1 to 3, characterized in that said clamping indicator is a ring (133D) surrounding the base of said gripping head (133B) of the locking screw (133) , intended to rest on said threaded cap (132) during the screwing of the threaded body (133A) of said locking screw (133) into said threaded cap (132) and bonded to said gripping head (133B) by a link frangible rupturable by shearing under the effect of a given tightening torque.
5. A spinal implant (100) according to one of claims 1 to 4, characterized in that said screw cap (132) and lacI ite ring (131) are two separate pieces joined together by the inte rmédiaire locking means further mutually cooperating.
6. A spinal implant (100) according to claim 5, characterized in that the screw cap (132) comprises a head adapted to be force fitted in said ring (131).
7. A spinal implant (100) according to one of revendicationsl to 6, characterized in that said ring (131) carries on its internal face (131 A) an annular flange (131 B) intended to bear against the upper edge of the mounting portion (120).
8. A spinal implant (100) according to claim 7, characterized in that said screw cap (132) comprises a head flange (132B) adapted to bear on the annular flange (131B) of said ring (131).
9. A spinal implant (100) according to one of claims 1 to 4, characterized in that the screw cap (132) and the ring (131) form a single piece.
10. A spinal implant (100) according to any one of the preceding claims, characterized in that said gripping head (133B) of the locking screw (133) has at one end a recess (133E) of the receiving end a screwing tool.
1 1. A spinal implant (100) according to any one of the preceding claims, characterized in that said locking screw (133) is one piece.
PCT/FR2004/002346 2003-09-17 2004-09-16 Locking rachidial implant provided with a tightness indicator WO2005027761A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0310905A FR2859620B1 (en) 2003-09-17 2003-09-17 Spinal implant has locking means provided with a clamping witness
FR0310905 2003-09-17

Publications (1)

Publication Number Publication Date
WO2005027761A1 true true WO2005027761A1 (en) 2005-03-31

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PCT/FR2004/002346 WO2005027761A1 (en) 2003-09-17 2004-09-16 Locking rachidial implant provided with a tightness indicator

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FR (1) FR2859620B1 (en)
WO (1) WO2005027761A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8641734B2 (en) 2009-02-13 2014-02-04 DePuy Synthes Products, LLC Dual spring posterior dynamic stabilization device with elongation limiting elastomers
US9161782B2 (en) 2009-10-16 2015-10-20 DePuy Synthes Products, Inc. Bone anchor assemblies and methods of manufacturing and use thereof
US9232968B2 (en) 2007-12-19 2016-01-12 DePuy Synthes Products, Inc. Polymeric pedicle rods and methods of manufacturing
US9320543B2 (en) 2009-06-25 2016-04-26 DePuy Synthes Products, Inc. Posterior dynamic stabilization device having a mobile anchor
US9445844B2 (en) 2010-03-24 2016-09-20 DePuy Synthes Products, Inc. Composite material posterior dynamic stabilization spring rod

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2980098B1 (en) * 2011-09-15 2014-01-03 Hassan Razian System for osteosynthesis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465158A2 (en) 1990-07-04 1992-01-08 Seyed Mohammad Hossein Mehdian Apparatus for use in the treatment of spinal disorders
US6077262A (en) 1993-06-04 2000-06-20 Synthes (U.S.A.) Posterior spinal implant
US6224558B1 (en) 1999-03-12 2001-05-01 Critikon Company, L.L.C. Signal enhancing and artifact reducing blood pressure cuff
US6224598B1 (en) 2000-02-16 2001-05-01 Roger P. Jackson Bone screw threaded plug closure with central set screw
US6585737B1 (en) * 1998-04-30 2003-07-01 Stryker Spine Backbone osteosynthesis system with collar and lock

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0465158A2 (en) 1990-07-04 1992-01-08 Seyed Mohammad Hossein Mehdian Apparatus for use in the treatment of spinal disorders
US6077262A (en) 1993-06-04 2000-06-20 Synthes (U.S.A.) Posterior spinal implant
US6585737B1 (en) * 1998-04-30 2003-07-01 Stryker Spine Backbone osteosynthesis system with collar and lock
US6224558B1 (en) 1999-03-12 2001-05-01 Critikon Company, L.L.C. Signal enhancing and artifact reducing blood pressure cuff
US6224598B1 (en) 2000-02-16 2001-05-01 Roger P. Jackson Bone screw threaded plug closure with central set screw

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9232968B2 (en) 2007-12-19 2016-01-12 DePuy Synthes Products, Inc. Polymeric pedicle rods and methods of manufacturing
US8641734B2 (en) 2009-02-13 2014-02-04 DePuy Synthes Products, LLC Dual spring posterior dynamic stabilization device with elongation limiting elastomers
US9320543B2 (en) 2009-06-25 2016-04-26 DePuy Synthes Products, Inc. Posterior dynamic stabilization device having a mobile anchor
US9161782B2 (en) 2009-10-16 2015-10-20 DePuy Synthes Products, Inc. Bone anchor assemblies and methods of manufacturing and use thereof
US9445844B2 (en) 2010-03-24 2016-09-20 DePuy Synthes Products, Inc. Composite material posterior dynamic stabilization spring rod

Also Published As

Publication number Publication date Type
FR2859620B1 (en) 2006-05-19 grant
FR2859620A1 (en) 2005-03-18 application

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