US20070055238A1 - Screw - Google Patents

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Publication number
US20070055238A1
US20070055238A1 US11/390,972 US39097206A US2007055238A1 US 20070055238 A1 US20070055238 A1 US 20070055238A1 US 39097206 A US39097206 A US 39097206A US 2007055238 A1 US2007055238 A1 US 2007055238A1
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US
United States
Prior art keywords
thread
screw
rod
legs
base
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US11/390,972
Inventor
Lutz Biedermann
Dezso Jeszensky
Jurgen Harms
Helmar Rapp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biedermann Motech GmbH and Co KG
Original Assignee
Biedermann Motech GmbH and Co KG
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
Application filed by Biedermann Motech GmbH and Co KG filed Critical Biedermann Motech GmbH and Co KG
Priority to US11/390,972 priority Critical patent/US20070055238A1/en
Publication of US20070055238A1 publication Critical patent/US20070055238A1/en
Abandoned legal-status Critical Current

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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
    • A61B17/84Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86Pins or screws or threaded wires; nuts therefor
    • 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
    • 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
    • A61B17/7035Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped

Definitions

  • the invention relates to an element to be used in spinal column or accident surgery for connecting to a rod.
  • a pedicle screw which comprises a head with a U-shaped recess defining two free legs to accommodate a rod, wherein the legs are provided with an inner thread to receive a fixing screw for fixing the rod.
  • a cap is provided embracing the legs.
  • a saw or else saw-tooth thread of this kind is known from Meyer's Enzyklopädisches Lexikon, Mannheim, 1974, page 302. From both the specifications U.S. Pat. Nos. 5,605,458 and 5,607,304, concerning implants, it is known with implants of this kind to be introduced into the body, in particular hip implants, also to construct the saw thread in such a way that the flank bearing the load is constructed not only at 90° to the thread axis but even at a negative angle. This is supposed to achieve that the connection obtained with the thread resists a radial relative movement of the connected parts and thus guarantees better fixing of the implant. From EP-A-1 128 773 a pedicle screw is known in which the inner thread of a head accommodating a rod has a negative thread and the screw cooperating with it is correspondingly constructed.
  • the object of the invention is to create an element of the kind initially described, which is suitable for avoiding the above described disadvantage. In particular bending up of the open ends of a mount of this kind and therefore loosening of the connection between screw and rod should be avoided.
  • This construction has the advantage that the action of force between the exposed legs and the inner thread happens in such a way that the open ends of the holding element are not pressed outwards, but instead are drawn inwards, so an intensive connection takes place between the cooperating elements.
  • FIG. 1 shows a side view of a monoaxial pedicle screw in a bisected exploded illustration.
  • FIG. 2 shows the head of the pedicle screw shown in FIG. 1 with inserted rod and inserted nut.
  • FIG. 3 shows the detail III indicated in FIG. 2 in enlarged scale.
  • FIG. 4 shows a section corresponding to the illustration chosen in FIG. 2 for a polyaxial screw.
  • FIG. 5 shows a schematically illustrated holding element with inserted rod and loosely screwed in inner screw.
  • FIG. 6 shows the detail VI in FIG. 5 in enlarged scale.
  • FIG. 7 shows the illustration corresponding to the illustration shown in FIG. 5 after the inner screw has been tightened.
  • FIG. 8 shows the detail VIII shown in FIG. 7 in enlarged scale.
  • the pedicle screw according to FIG. 1 which can, of course, also be used generally as a bone screw or constructed as a hook, has a thread shank 1 and a head 2 .
  • the head 2 has a U-shaped recess 4 , extending in the direction of the longitudinal axis 3 of the screw and with a predetermined depth.
  • an inner thread 8 is provided coming from the open end 7 of the legs.
  • a screw 9 is provided, the outer thread of which is constructed in such a way that it cooperates with the inner thread 8 .
  • a rod 10 to be connected to the screw, is placed in the U-shaped recess 4 in such a way that the rod comes to rest on the base of the U-shaped recess.
  • the screw 9 is then screwed in far enough for it to exert sufficient stopping pressure on the rod 10 located in the U-shaped recess.
  • the inner thread in the head 2 and the outer thread of the screw 9 are constructed in the way of a saw thread.
  • the screw 9 On the surface 11 facing away from the rod 10 to be fixed the screw 9 has a slit or a hexagonal recess for the insertion of a screwdriver.
  • each flank 26 facing the open end 7 or the surface 11 forms the negative angle ⁇ 2 , which cooperates with the corresponding flank 12 .
  • FIG. 4 corresponds identically in the construction of the inner thread 8 and the screw 9 cooperating with it and of the rod 10 .
  • Corresponding features are characterised by the same reference numerals.
  • the thread shank 1 is connected to a receiving part 15 via a spherical head 14 .
  • the receiving part has on one end an axially symmetrically aligned first bore 16 , the diameter of which is larger than that of the thread section 1 and smaller than that of the head 14 .
  • the receiving part further has a coaxial second bore 17 , which is open on the end located opposite the first bore and the diameter of which is large enough for the screw element to be guided through the open end with its thread section through the first bore and with the head 14 to the base of the second bore.
  • a small coaxial section us provided, which directly borders on the first bore and is constructed as spherical towards the open end, wherein the radius is substantially identical to the radius of the ball-segment-shaped section of the head 14 .
  • the inner thread 8 is again provided bordering on the open ends 7 of the legs 5 , 6 .
  • the receiving part 15 further has a U-shaped recess 18 , arranged symmetrical to the centre of the part, the base of which is directed towards the first bore, the two side legs 5 , 6 of which extend towards the open end 7 .
  • a pressure element is placed, which is situated on the spherical head 14 .
  • the rod 10 is inserted into the U-shaped recess.
  • the screw 9 is turned and screwed, in the same way as shown in FIG. 2 , until it exerts a desired pressure on the pressure element 19 and therefore on the head 14 to stop it.
  • the head or the receiving part can also be connected to a hook, as used in spinal column surgery for hooking in behind bone projections of the spinal column.
  • Threads with rounded tips and rounded base, pointed threads and pointed thread base and flat thread edges and flat thread base should be also be included, as is also the case with a triangular thread, round thread and trapezoidal thread.
  • FIG. 5 as in FIG. 2 , the head of the pedicle screw shown in FIG. 1 is shown with inserted rod and only initially inserted inner thread 9 .
  • FIG. 6 section VI from FIG. 5 is illustrated in larger detail.
  • the inner screw 9 and the outer thread of the legs 5 are dimensioned relative to one another as follows: radius r 1 from the centre of the screw coinciding with the longitudinal axis 3 to the base 21 of the thread of the screw 9 is smaller than radius r 2 from the central axis of the holding element coinciding with the symmetrical axis 3 to the tip of its spiral 20 .
  • Radius r 3 from the centre of the screw coinciding with the longitudinal axis 3 to the tip of the spiral 22 of the screw 9 is smaller than radius r 4 from the central axis of the holding element coinciding with the longitudinal axis 3 to the base 23 of the thread of its inner thread.
  • FIG. 7 shows the same object as in FIGS. 5 and 6 , wherein the screw 9 is now screwed inwards far enough for it to press on the rod 10 and thereby to effect a counter-force, indicated by the arrow 27 , on the screw 9 .
  • the flanks 12 , 26 facing one another in each case thereby end up on top of one another at a negative flank angle ⁇ 2 , whereby the spirals 28 , 29 of the inner thread are drawn inwards towards the respective base 21 of the pitches of the thread of the screw 9 in the manner shown in FIG. 8 , with the result that the exposed legs are biased not outwards but inwards.
  • the difference between the measurement of radii r 1 and r 2 is about 1 to 5% of the outer diameter of the thread or 0.1 to 0.5 mm with a screw diameter of 5 to 12 mm.

Abstract

An element with a thread is created, in which both partial flanks enclose a negative angle with a plane extending perpendicular to the screw axis. Further, a screw or a hook for connecting to a rod, as used in particular in spinal column surgery, is created, wherein the inner thread of a holder, to which the rod is connected, and the associated thread of a nut comprise the thread according to the invention.

Description

  • The invention relates to an element to be used in spinal column or accident surgery for connecting to a rod.
  • From U.S. Pat. No. 5,129,388 a pedicle screw is known which comprises a head with a U-shaped recess defining two free legs to accommodate a rod, wherein the legs are provided with an inner thread to receive a fixing screw for fixing the rod. To prevent spreading of the legs a cap is provided embracing the legs.
  • From U.S. Pat. No. 5,005,562 it is known with a pedicle screw according to the preamble of Patent claim 1 to construct the inner thread and the thread of the screw cooperating with it as a saw-tooth thread, so as in this way to avoid spreading out of the two flanks by completely eliminating the radial components of the force during screwing in.
  • A saw or else saw-tooth thread of this kind is known from Meyer's Enzyklopädisches Lexikon, Mannheim, 1974, page 302. From both the specifications U.S. Pat. Nos. 5,605,458 and 5,607,304, concerning implants, it is known with implants of this kind to be introduced into the body, in particular hip implants, also to construct the saw thread in such a way that the flank bearing the load is constructed not only at 90° to the thread axis but even at a negative angle. This is supposed to achieve that the connection obtained with the thread resists a radial relative movement of the connected parts and thus guarantees better fixing of the implant. From EP-A-1 128 773 a pedicle screw is known in which the inner thread of a head accommodating a rod has a negative thread and the screw cooperating with it is correspondingly constructed.
  • The object of the invention is to create an element of the kind initially described, which is suitable for avoiding the above described disadvantage. In particular bending up of the open ends of a mount of this kind and therefore loosening of the connection between screw and rod should be avoided.
  • This object is achieved by the element characterised in Patent claim 1.
  • This construction has the advantage that the action of force between the exposed legs and the inner thread happens in such a way that the open ends of the holding element are not pressed outwards, but instead are drawn inwards, so an intensive connection takes place between the cooperating elements.
  • Further features and advantages of the invention emerge from the description of the embodiment examples using the figures.
  • FIG. 1 shows a side view of a monoaxial pedicle screw in a bisected exploded illustration.
  • FIG. 2 shows the head of the pedicle screw shown in FIG. 1 with inserted rod and inserted nut.
  • FIG. 3 shows the detail III indicated in FIG. 2 in enlarged scale.
  • FIG. 4 shows a section corresponding to the illustration chosen in FIG. 2 for a polyaxial screw.
  • FIG. 5 shows a schematically illustrated holding element with inserted rod and loosely screwed in inner screw.
  • FIG. 6 shows the detail VI in FIG. 5 in enlarged scale.
  • FIG. 7 shows the illustration corresponding to the illustration shown in FIG. 5 after the inner screw has been tightened.
  • FIG. 8 shows the detail VIII shown in FIG. 7 in enlarged scale.
  • The pedicle screw according to FIG. 1, which can, of course, also be used generally as a bone screw or constructed as a hook, has a thread shank 1 and a head 2. The head 2 has a U-shaped recess 4, extending in the direction of the longitudinal axis 3 of the screw and with a predetermined depth. On the two thereby constructed legs 5, 6 an inner thread 8 is provided coming from the open end 7 of the legs. Matched to the inner thread 8, a screw 9 is provided, the outer thread of which is constructed in such a way that it cooperates with the inner thread 8.
  • In operation a rod 10, to be connected to the screw, is placed in the U-shaped recess 4 in such a way that the rod comes to rest on the base of the U-shaped recess. The screw 9 is then screwed in far enough for it to exert sufficient stopping pressure on the rod 10 located in the U-shaped recess.
  • As can be seen more clearly in FIGS. 2 and 3, the inner thread in the head 2 and the outer thread of the screw 9 are constructed in the way of a saw thread. On the surface 11 facing away from the rod 10 to be fixed the screw 9 has a slit or a hexagonal recess for the insertion of a screwdriver.
  • In the thread in each case two adjacent partial flanks 12, 13 form a thread pitch. The two partial flanks 12, 13 enclose the flank angle β. The flank side 13 facing the open end 7 encloses a positive angle β1 with a plane 40, extending perpendicular to the longitudinal axis 3 and intersecting the flank side 13 on the base 23 of the thread (see FIG. 3). The partial flank 12 facing away from the open end is inclined in such a way that in the manner shown in FIG. 3 it encloses a negative angle β2 with a corresponding plane 40. As can be seen from the figures the thread of the screw 9 is made correspondingly, so the pitches of the screw 9 engage appropriately in the inner thread 8. In screw 9 therefore each flank 26 facing the open end 7 or the surface 11 forms the negative angle β2, which cooperates with the corresponding flank 12.
  • The embodiment shown in FIG. 4 corresponds identically in the construction of the inner thread 8 and the screw 9 cooperating with it and of the rod 10. Corresponding features are characterised by the same reference numerals.
  • By contrast with the first embodiment here there is a so-called polyaxial screw, in which the thread shank 1 is connected to a receiving part 15 via a spherical head 14. The receiving part has on one end an axially symmetrically aligned first bore 16, the diameter of which is larger than that of the thread section 1 and smaller than that of the head 14. The receiving part further has a coaxial second bore 17, which is open on the end located opposite the first bore and the diameter of which is large enough for the screw element to be guided through the open end with its thread section through the first bore and with the head 14 to the base of the second bore. Between the first and the second bore a small coaxial section us provided, which directly borders on the first bore and is constructed as spherical towards the open end, wherein the radius is substantially identical to the radius of the ball-segment-shaped section of the head 14. The inner thread 8 is again provided bordering on the open ends 7 of the legs 5, 6. The receiving part 15 further has a U-shaped recess 18, arranged symmetrical to the centre of the part, the base of which is directed towards the first bore, the two side legs 5, 6 of which extend towards the open end 7. Further, in the second bore 17 a pressure element is placed, which is situated on the spherical head 14. In operation the rod 10 is inserted into the U-shaped recess. Then the screw 9 is turned and screwed, in the same way as shown in FIG. 2, until it exerts a desired pressure on the pressure element 19 and therefore on the head 14 to stop it.
  • Instead of the above described embodiments, in which the head or the receiving part are connected in each case to a bone screw, the head or the receiving part can also be connected to a hook, as used in spinal column surgery for hooking in behind bone projections of the spinal column.
  • When a saw thread is spoken of above this is only supposed to characterise the direction of the partial flanks. Threads with rounded tips and rounded base, pointed threads and pointed thread base and flat thread edges and flat thread base should be also be included, as is also the case with a triangular thread, round thread and trapezoidal thread.
  • Whereas with known screws with a metric thread, in which the screw presses on a rod in the way shown in FIG. 2, one force component acts towards the open side 11 of the screw and a second force component acts outwards in each case, with the above described thread according to the invention again one component acts towards the open end 7, but the second component acts in the direction of the longitudinal axis 3. The result of this is that the exposed legs 5, 6 are not pressed outwards, but are drawn towards the symmetrical axis.
  • In FIG. 5, as in FIG. 2, the head of the pedicle screw shown in FIG. 1 is shown with inserted rod and only initially inserted inner thread 9. In FIG. 6 section VI from FIG. 5 is illustrated in larger detail. As emerges from this enlarged illustration, the inner screw 9 and the outer thread of the legs 5 are dimensioned relative to one another as follows: radius r1 from the centre of the screw coinciding with the longitudinal axis 3 to the base 21 of the thread of the screw 9 is smaller than radius r2 from the central axis of the holding element coinciding with the symmetrical axis 3 to the tip of its spiral 20. Radius r3 from the centre of the screw coinciding with the longitudinal axis 3 to the tip of the spiral 22 of the screw 9 is smaller than radius r4 from the central axis of the holding element coinciding with the longitudinal axis 3 to the base 23 of the thread of its inner thread.
  • As can be seen in particular in FIG. 6, when screw 9 and exposed legs 5, 6 of the holding element are brought into engagement without load, when the cooperating flanks 13 of the inner thread and 24 of the screw, having the positive flank angles, are adjacent to one another there is a gap 25 between the flanks 12, 26, having a negative flank angle, facing one another in each case.
  • FIG. 7 shows the same object as in FIGS. 5 and 6, wherein the screw 9 is now screwed inwards far enough for it to press on the rod 10 and thereby to effect a counter-force, indicated by the arrow 27, on the screw 9. As a result of this, as can be seen in FIG. 8, the flanks 12, 26 facing one another in each case thereby end up on top of one another at a negative flank angle β2, whereby the spirals 28, 29 of the inner thread are drawn inwards towards the respective base 21 of the pitches of the thread of the screw 9 in the manner shown in FIG. 8, with the result that the exposed legs are biased not outwards but inwards.
  • In a preferred embodiment the difference between the measurement of radii r1 and r2 is about 1 to 5% of the outer diameter of the thread or 0.1 to 0.5 mm with a screw diameter of 5 to 12 mm.

Claims (4)

1. (canceled)
2. (canceled)
3. A device comprising:
a shank;
a holding component for engaging and holding a rod, the holding component comprising a recess having two legs, a U-shaped cross-section for accommodating the rod, an open end for receiving the rod into the U-shaped cross-section between the legs, and an inner thread on the legs; and a screw, which cooperates with the inner thread and directly or indirectly acts on the rod when positioned in the recess, the screw having a central axis;
wherein the inner thread comprises an inner thread base, first and second partial flanks adjacent to one another, and an internal thread edge between the first and second partial flanks;
wherein the screw has an outer thread for engagement with the inner thread of the legs, the outer thread comprising an outer thread base, third and fourth partial flanks adjacent to one another, and an external thread edge between the third and fourth partial flanks;
the first and third partial flanks, which face away from the open end, enclose a negative angle β2 with a plane which extends through the respective thread base and extends perpendicular to the central axis;
the second and fourth partial flanks, which face toward the open end, enclose a positive angle β1 with a plane which extends through the respective thread base and extends perpendicular to the central axis.
4. The device according to claim 3, wherein the internal thread base is rounded between adjacent first and second partial flanks.
US11/390,972 2000-12-27 2006-03-27 Screw Abandoned US20070055238A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/390,972 US20070055238A1 (en) 2000-12-27 2006-03-27 Screw

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10065396 2000-12-27
EP01106711.3 2001-03-16
EP01106711A EP1219255B1 (en) 2000-12-27 2001-03-16 Screw for connection to a rod
US10/098,937 US7018378B2 (en) 2000-12-27 2002-03-15 Screw
US11/390,972 US20070055238A1 (en) 2000-12-27 2006-03-27 Screw

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US10/098,937 Continuation US7018378B2 (en) 2000-12-27 2002-03-15 Screw

Publications (1)

Publication Number Publication Date
US20070055238A1 true US20070055238A1 (en) 2007-03-08

Family

ID=39720082

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/098,937 Expired - Lifetime US7018378B2 (en) 2000-12-27 2002-03-15 Screw
US11/390,972 Abandoned US20070055238A1 (en) 2000-12-27 2006-03-27 Screw

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10/098,937 Expired - Lifetime US7018378B2 (en) 2000-12-27 2002-03-15 Screw

Country Status (6)

Country Link
US (2) US7018378B2 (en)
EP (1) EP1219255B1 (en)
JP (1) JP4395284B2 (en)
KR (1) KR100687089B1 (en)
DE (1) DE50100793D1 (en)
TW (1) TWI235794B (en)

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US20080140076A1 (en) * 2005-09-30 2008-06-12 Jackson Roger P Dynamic stabilization connecting member with slitted segment and surrounding external elastomer
US20080147121A1 (en) * 2006-01-27 2008-06-19 Warsaw Orthopedic, Inc. Multi-Axial Screw Assembly
US20080177317A1 (en) * 2007-01-18 2008-07-24 Jackson Roger P Dynamic stabilization connecting member with cord connection
US20080188898A1 (en) * 2004-11-23 2008-08-07 Jackson Roger P Polyaxial bone screw with multi-part shank retainer and pressure insert
US20090192552A1 (en) * 2008-01-25 2009-07-30 Andersen Bruce J Osteoporatic screw and expansion sleeve
US20090275985A1 (en) * 2007-05-01 2009-11-05 Jackson Roger P Dynamic stabilization assembly having pre-compressed spacers with differential displacements
US20100010542A1 (en) * 2006-01-09 2010-01-14 Jackson Roger P Flexible spinal stbilization assembly with spacer having off-axis core member
US20100016904A1 (en) * 2003-06-18 2010-01-21 Jackson Roger P Upload shank swivel head bone screw spinal implant
US20100087874A1 (en) * 2005-12-21 2010-04-08 Jong Wuk Jang Pedicle screw
US7722652B2 (en) 2006-01-27 2010-05-25 Warsaw Orthopedic, Inc. Pivoting joints for spinal implants including designed resistance to motion and methods of use
US20100174319A1 (en) * 2001-05-09 2010-07-08 Jackson Roger P Dynamic spinal stabilization assembly with elastic bumpers and locking limited travel closure mechanisms
US7833252B2 (en) 2006-01-27 2010-11-16 Warsaw Orthopedic, Inc. Pivoting joints for spinal implants including designed resistance to motion and methods of use
US7955363B2 (en) 2002-04-18 2011-06-07 Aesculap Implant Systems, Llc Screw and rod fixation assembly and device
US7967850B2 (en) 2003-06-18 2011-06-28 Jackson Roger P Polyaxial bone anchor with helical capture connection, insert and dual locking assembly
US8066739B2 (en) 2004-02-27 2011-11-29 Jackson Roger P Tool system for dynamic spinal implants
US8100915B2 (en) 2004-02-27 2012-01-24 Jackson Roger P Orthopedic implant rod reduction tool set and method
US8105368B2 (en) 2005-09-30 2012-01-31 Jackson Roger P Dynamic stabilization connecting member with slitted core and outer sleeve
US8137386B2 (en) 2003-08-28 2012-03-20 Jackson Roger P Polyaxial bone screw apparatus
US8152810B2 (en) 2004-11-23 2012-04-10 Jackson Roger P Spinal fixation tool set and method
US8257398B2 (en) 2003-06-18 2012-09-04 Jackson Roger P Polyaxial bone screw with cam capture
US8308782B2 (en) 2004-11-23 2012-11-13 Jackson Roger P Bone anchors with longitudinal connecting member engaging inserts and closures for fixation and optional angulation
US8353932B2 (en) 2005-09-30 2013-01-15 Jackson Roger P Polyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate member
US8377102B2 (en) 2003-06-18 2013-02-19 Roger P. Jackson Polyaxial bone anchor with spline capture connection and lower pressure insert
US8394133B2 (en) 2004-02-27 2013-03-12 Roger P. Jackson Dynamic fixation assemblies with inner core and outer coil-like member
US8398682B2 (en) 2003-06-18 2013-03-19 Roger P. Jackson Polyaxial bone screw assembly
US8444681B2 (en) 2009-06-15 2013-05-21 Roger P. Jackson Polyaxial bone anchor with pop-on shank, friction fit retainer and winged insert
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US8591560B2 (en) 2005-09-30 2013-11-26 Roger P. Jackson Dynamic stabilization connecting member with elastic core and outer sleeve
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US8814911B2 (en) 2003-06-18 2014-08-26 Roger P. Jackson Polyaxial bone screw with cam connection and lock and release insert
US8845649B2 (en) 2004-09-24 2014-09-30 Roger P. Jackson Spinal fixation tool set and method for rod reduction and fastener insertion
US8911479B2 (en) 2012-01-10 2014-12-16 Roger P. Jackson Multi-start closures for open implants
US8936623B2 (en) 2003-06-18 2015-01-20 Roger P. Jackson Polyaxial bone screw assembly
US8979904B2 (en) 2007-05-01 2015-03-17 Roger P Jackson Connecting member with tensioned cord, low profile rigid sleeve and spacer with torsion control
US8998959B2 (en) 2009-06-15 2015-04-07 Roger P Jackson Polyaxial bone anchors with pop-on shank, fully constrained friction fit retainer and lock and release insert
US9050139B2 (en) 2004-02-27 2015-06-09 Roger P. Jackson Orthopedic implant rod reduction tool set and method
US9168069B2 (en) 2009-06-15 2015-10-27 Roger P. Jackson Polyaxial bone anchor with pop-on shank and winged insert with lower skirt for engaging a friction fit retainer
US9216039B2 (en) 2004-02-27 2015-12-22 Roger P. Jackson Dynamic spinal stabilization assemblies, tool set and method
US9216041B2 (en) 2009-06-15 2015-12-22 Roger P. Jackson Spinal connecting members with tensioned cords and rigid sleeves for engaging compression inserts
US9414863B2 (en) 2005-02-22 2016-08-16 Roger P. Jackson Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures
US9451989B2 (en) 2007-01-18 2016-09-27 Roger P Jackson Dynamic stabilization members with elastic and inelastic sections
US9480517B2 (en) 2009-06-15 2016-11-01 Roger P. Jackson Polyaxial bone anchor with pop-on shank, shank, friction fit retainer, winged insert and low profile edge lock
US9743957B2 (en) 2004-11-10 2017-08-29 Roger P. Jackson Polyaxial bone screw with shank articulation pressure insert and method
US9907574B2 (en) 2008-08-01 2018-03-06 Roger P. Jackson Polyaxial bone anchors with pop-on shank, friction fit fully restrained retainer, insert and tool receiving features
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KR100687089B1 (en) 2007-02-27
US7018378B2 (en) 2006-03-28
KR20020073427A (en) 2002-09-26
JP4395284B2 (en) 2010-01-06
DE50100793D1 (en) 2003-11-20
US20020138076A1 (en) 2002-09-26
JP2002330976A (en) 2002-11-19
EP1219255B1 (en) 2003-10-15
EP1219255A1 (en) 2002-07-03
TWI235794B (en) 2005-07-11

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