US20040111088A1 - Multi-rod bone attachment member - Google Patents
Multi-rod bone attachment member Download PDFInfo
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- US20040111088A1 US20040111088A1 US10/313,171 US31317102A US2004111088A1 US 20040111088 A1 US20040111088 A1 US 20040111088A1 US 31317102 A US31317102 A US 31317102A US 2004111088 A1 US2004111088 A1 US 2004111088A1
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- head portion
- elongated member
- channels
- channel
- attachment portion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
- A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
- A61B17/7037—Screws 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7044—Screws or hooks combined with longitudinal elements which do not contact vertebrae also having plates, staples or washers bearing on the vertebrae
Definitions
- a variety of implants are known in the art for attaching an elongated member, e.g. an elongated bar or rod, to one or more bones for the purpose of correcting deformity, promoting healing, or other therapeutic uses.
- an elongated member e.g. an elongated bar or rod
- a U-shaped head is provided for accommodating an orthopedic rod, such as that used in corrective spinal surgery.
- a threaded element or hook connects the U-shaped head to a bone portion, and a set screw locks the elongated rod within the U-shaped head.
- an apparatus which comprises a one-piece head portion having one or more channels, with the channels being configured so that a plurality of elongated members (e.g. spinal rods) may be connected to the head via one or more of the channels.
- At least one holder is connected to the head portion and holds at least one of the elongated members within their respective channels, and an attachment portion is provided connected to the head portion for connecting the head portion to a bone.
- Such a pair of channels can have approximately the same width or radius, or one of the channels can have a width or radius larger than the other.
- a female thread can be formed in each of such channels, with set screws provided as the holders.
- the attachment portion may be integral with or may be movably connected with the head portion. If they are movably connected, the attachment portion may be rotatably or multi-axially connected with the head portion.
- a first thread is formed on the first leg and the post, and a second thread is formed on the second leg and the post.
- First and second set screws are provided, with the first set screw adapted to be threaded in the first thread to close the first channel, and the second set screw adapted to be threaded in the second thread to close the second channel.
- a bone connection portion is connected to the head portion, whereby the apparatus is connected to a bone.
- the apparatus can further comprise a first elongated member, such as a spinal rod, such that at least a portion of the first elongated member occupies at least a portion of the first channel.
- the first set screw provides a clamping force to hold the elongated member with respect to the head portion.
- a second elongated member can also be provided such that at least a portion of the second elongated member occupies at least a portion of the second channel in the head portion, and the second set screw provides a clamping force to hold the second elongated member with respect to the head portion.
- a method comprising providing a bone-engaging apparatus having an upper head portion and at least one lower attachment portion, with the head portion having a plurality of channels for receiving one or more elongated members; connecting the attachment portion of the apparatus to a bone; inserting an elongated member into one of the channels; and connecting a holder to said head portion to hold said elongated member in said channel.
- the holder connecting step can include threading a set screw into the channel into which the elongated member has been inserted until the set screw exerts a clamping force on said elongated member sufficient to lock it with respect to the head portion.
- the method may further include inserting a second elongated member into one of the channels.
- the channel into which the second elongated member is inserted can be previously occupied or unoccupied by an elongated member.
- An additional holder may be provided, if necessary, for the second elongated member.
- a set screw may be threaded into the channel into which the second elongated member has been inserted until it exerts a clamping force on the second elongated member.
- the method may also include adjusting the bone prior to insertion of the first elongated member, and further adjustment of the bone prior to insertion of the second elongated member.
- the relative position of the attachment portion and the head portion may be adjusted prior to a time when the elongated member(s) are locked with respect to the apparatus.
- FIG. 1 is a front elevational view of a first embodiment of a bone fixation element according to the invention.
- FIG. 2 is a side view of the embodiment shown in FIG. 1.
- FIG. 3 is a cross-sectional view taken along the lines 3 - 3 and viewed in the direction of the arrows of the embodiment shown in FIG. 1.
- FIG. 4 is a partial cross-sectional view of a further embodiment of a bone fixation element according to the invention.
- FIG. 5 is a partial cross-sectional view of another embodiment of a bone fixation element according to the invention.
- FIG. 6 is a partial cross-sectional view of yet another embodiment of a bone fixation element according to the invention.
- FIG. 7 is a partial cross-sectional view of another embodiment of a bone fixation element according to the invention.
- FIG. 8 is a partial cross-sectional view of a still further embodiment of a bone fixation element according to the invention.
- FIG. 9 is a partial cross-sectional view of another embodiment of a bone fixation element according to the invention.
- FIG. 10 is a side view of yet another embodiment of a bone fixation element according to the invention.
- FIG. 11 is a side view of another embodiment of a bone fixation element according to the invention.
- fixation element 10 includes a head portion 12 and an attachment portion 14 .
- fixation element 10 is depicted as a bone screw, with a threaded attachment portion 14 , one of ordinary skill in this art will appreciate that threaded attachment portion 14 could be replaced with a U-shaped or L-shaped hook element adapted to be fixed to a part of a bone, such as a pedicle or spinous process of a vertebra, or with another device allowing connection to a bone.
- head portion 12 is substantially in the shape of a W, having two outer legs or legs 16 , 18 , and a post 20 between legs 16 , 18 .
- Leg 16 and post 20 form a first channel 22
- leg 18 and post 20 form a second channel 24 .
- Channels 22 and 24 are preferably substantially straight and substantially parallel, and have a lower surface 26 , 28 , which may be curved or form a part of a cylinder.
- Channels 22 and 24 are sized and shaped to accommodate a rod or other elongated element R.
- channels 22 and 24 are sized to accommodate rods of the same size, as for example where the radius of curvature of surfaces 26 and 28 are equal.
- Channels 22 and 24 are bounded by wall sections 32 and 34 , and 36 and 38 , respectively.
- Wall section 32 is an inner part of leg 16
- wall sections 34 and 36 form sides of post 20
- wall section 38 is an inner part of leg 18 .
- Wall sections 32 and 34 include a female thread 40
- wall sections 36 and 38 include a female thread 42 .
- Threads 40 and 42 are adapted to accommodate set screws, such as that denoted as 44 in FIG. 1, and threads 40 , 42 and set screws 44 are holders that close channel 22 and hold or lock a rod or other elongated member therein.
- threads 40 and/or 42 may be altered, removed, or replaced with other features (e.g. grooves, external threads or the like) that permit connection to such holders.
- a set screw 44 and compatible threads e.g. threads 40 , 42
- a first set screw 44 for channel 22 and a second set screw 44 for channel 24 it would be possible to use one or more holders of another type, e.g. caps or nuts, to contain or lock multiple rods or other elongated members within their specific channels.
- a cap or nut that surrounded and connected to legs 16 and 18 of head portion 12 would close both channels 22 and 24 and keep elongated member(s) therein.
- indentations 46 and 48 are adapted to accommodate a holding or twisting tool, such as a screwdriver.
- indentations 46 and 48 are substantially circular, and may have a slightly tapered opening, so that a projection on a gripping or screwing tool that has a circular or other shape can easily be inserted into indentations 46 and 48 .
- attachment portion 14 may be formed integrally with head portion 12 , or may be made separately from head portion 12 and fixedly attached to head portion 12 after manufacture.
- Attachment portion 14 is a threaded member in the illustrated embodiment, having threads 50 adapted for insertion into a bone.
- Attachment portion 14 is illustrated as having a flattened end 52 , but it will be understood that end 52 may also be pointed and/or self-tapping.
- Fixation element 10 may also be cannulated, i.e. having an aperture 54 extending from end 52 of attachment portion 14 to the top of post 20 of head portion 12 .
- the embodiment of FIG. 1 also shows attachment portion 14 along a medial axis (i.e.
- attachment portion 14 may be placed to one side of a medial axis, for example directly beneath one of channels 22 and 24 .
- fixation element 10 In use, access to an orthopedic surgical site is obtained in a known manner. A drill or similar device is used to make a hole in a bone.
- fixation element 10 will be described with respect to spinal surgery, although it is understood that the present invention may be used with other bony tissue or another surgical site.
- attachment portion 14 of fixation element 10 is inserted, and fixation element 10 is rotated so that fixation element 10 is screwed into the hole.
- the surgeon continues turning fixation element 10 until it is in a desired position, e.g. head portion 12 is at a desired height from the surface of the vertebra, and channels 22 and 24 are oriented as the surgeon desires for a rod.
- fixation element 10 When used in spinal surgery, commonly fixation element 10 will be threaded into the bone until most or all of thread 50 is within the bone, and channels 22 and 24 are oriented substantially along the spinal column or along a desired orientation of one or more spinal segments.
- rod R is placed in channel 22 , and set screw 44 is screwed into internal thread 40 to close channel 22 and hold or lock rod R therein.
- rod R may also be placed in channel 24 , in substantially the same manner as described above. If two rods are used, one rod may be placed in each of channels 22 and 24 and held or locked therein with set screws, as described above.
- a surgeon can insert a screw or hook minimally-invasively, perform a degree of adjustment to the spine and connect a first rod that may be somewhat less rigid than is normally used in corrective spinal surgery (e.g. scoliosis-correcting surgery).
- the first rod holds the affected spinal segment(s) sufficiently while another, more-rigid rod is prepared and the spine adjusted to its final, corrected position.
- the second rod is then inserted and locked into the screws or hooks, and the surgery is completed.
- use of yet additional rods or other elongated members or additional spine-adjustment steps may be indicated or necessary, and thus screws or hooks that accommodate three or more rods come within the spirit of the invention.
- Fixation element 110 is substantially the same as fixation member 10 with the exception that fixation member 110 has one channel (e.g. channel 124 ) that will accommodate a rod larger than the other (e.g. channel 122 ) will accommodate.
- Lower surface 126 of channel 122 has a smaller radius than bottom surface 128 of channel 124 , and the distance between walls 132 and 134 of channel 122 is smaller than the distance between walls 136 and 138 of channel 124 .
- a smaller set screw or other holding or locking element may be used in channel 122 compared to that used in channel 124 .
- fixation element 110 is essentially the same as fixation element 10 .
- Fixation element 110 may be used where it is preferred to have two rods of different diameters in a particular orthopedic construct. In the spinal surgical field, for example, it is common to reposition (distract, compress, rotate, or otherwise adjust relative location) vertebrae prior to or during implantation of a supporting or corrective apparatus. Connecting a smaller, less-rigid rod to fixation element 110 as described above will allow some holding or support of a spine that has been adjusted, while still allowing the surgeon to readjust the spine and/or contour a larger, more-rigid rod for providing the main support or correction to the spine.
- Fixation element 110 may be placed in a vertebra as described above with respect to fixation element 10 .
- a first rod R 1 of relatively smaller diameter may be placed in channel 122 , and held with a set screw 144 .
- the surgeon can then perform additional or new repositioning procedures if he or she chooses, and may bend the locked rod in the process. While the relatively smaller rod R 1 is holding the vertebra as desired, the surgeon can contour a larger rod R 2 or perform other surgical procedures while the spine is held by the relatively smaller rod.
- the relatively larger rod R 2 once prepared as the surgeon desires, can then be inserted into channel 124 of fixation element 110 , and locked with another set screw 144 a.
- attachment portion 14 , 114 is substantially centered between legs 16 and 18 .
- the present invention includes embodiments in which attachment portion 14 may be nearer to one leg or another, or it may be directly beneath one of channels 22 or 24 , or have some other non-symmetrical configuration.
- fixation element 210 is similar to fixation element 10 , except head portion 212 and attachment portion 214 are not initially integral with or fixed to each other. Rather, attachment portion 214 is separate from head portion 212 , and is rotatable with respect to head portion 212 .
- fixation element 210 includes head portion 212 having two channels 222 and 224 .
- the channels have wall sections 232 , 234 , 236 and 238 that are threaded with threads 240 , 242 .
- One of the channels e.g. channel 222 , communicates with a hole H that extends from the top to the bottom of head portion 212 .
- a groove 258 is set, essentially surrounding hole H.
- Attachment portion 214 in this embodiment is a bone screw having bone threads 250 and a head 260 , although it will be understood that hook could be provided on attachment portion 214 instead.
- Head 260 is substantially cylindrical, with a flange 262 at the top of head 260 , and an internal print 264 within head 260 to enable attachment portion 214 to be screwed into a bone.
- Fixation element 210 is assembled by inserting head 260 of attachment portion 214 into hole H of head portion 212 through the bottom end of head portion 212 .
- a C-shaped snap ring 266 is provided to retain attachment portion 214 within head portion 212 .
- Snap ring 266 has an inner diameter larger than the diameter of head 260 , but smaller than the diameter of flange 262 of head 260 .
- the outer diameter of snap ring 266 in its non-stressed state, is slightly larger than the diameter of groove 258 in head portion 212 .
- attachment portion 214 is rotatable with respect to head portion 212 , but not necessarily multi-axially moveable with respect to head portion 212 .
- fixation element 210 To use fixation element 210 , a hole in a bone (e.g. a vertebra) is prepared as described above. The assembled fixation element 210 is then coupled to the bone, by inserting the attachment portion 214 into the hole and screwing it into the bone. Attachment portion 214 may be screwed in to a point where the bottom of head portion 212 contacts bone and flange 262 presses against snap-ring 266 , effectively holding attachment portion 214 with respect to head portion 212 . Alternatively, attachment portion 214 can be screwed in to a lesser degree, with rotation of head portion 212 with respect to attachment portion 214 being inhibited or prevented by insertion of one or more rods into one or both channels 222 , 224 . Once such rod(s) are inserted into one or both of channels 222 and 224 they are locked therein, as described above with respect to fixation element 10 .
- a bone e.g. a vertebra
- Fixation element 310 is very similar to fixation element 210 , except that attachment portion 314 is configured so that its connection with head portion 312 is a multi-axial connection.
- a preferred configuration for the connection between head portion 312 and attachment portion 314 is disclosed in U.S. Pat. No. 6,280,445 to Barker et al., the entirety of which is incorporated by reference.
- attachment portion 314 includes a rounded head 360 that sits within hole H of head portion 312 , and is retained therein by a C-shaped snap ring 366 seated in groove 358 .
- a crown member 370 sets atop the head 360 of attachment portion 314 .
- Fixation element 310 is connected to a bone in essentially the same fashion as fixation element 210 described above. After attachment portion 314 is screwed into the bone, head portion 312 may be adjusted multi-axially with respect to attachment portion 314 . A rod is introduced into channel 322 , and any further multi-axial adjustments of head portion 312 with respect to attachment portion 314 can be made. A set screw 344 is threaded into threads 340 communicating with channel 322 . Locking down set screw 344 presses the rod down on crown member 370 , which locks head 360 of attachment portion 314 between crown member 370 and snap ring 362 . In a particular embodiment, head 360 may have ridges 372 that are somewhat harder than the material of crown member 370 , so that crown member 370 and head 360 are locked together by ridges 372 biting into crown member 370 .
- Fixation element 410 includes a head portion 412 and an attachment portion 414 .
- head portion 412 and attachment portion 414 may be integral or initially fixed with each other (as in fixation member 10 ), rotatable with respect to each other (as in fixation member 210 ), or multi-axially connected (as in fixation member 310 ).
- Head portion 412 includes an underside 456 having an approximately anatomically-shaped curvature. In a specific embodiment, the curvature has a concave aspect that approximates the curvature of a side of a vertebra.
- the curvature may have a concave aspect in a first cross-section and a convex aspect in a second cross-section, e.g. one perpendicular to the first cross-section.
- Extending from surface 456 is a prong or spike 474 .
- Spike 474 is intended to be inserted into the bone tissue when fixation element 410 is attached to a bone, to provide yet further stability to the implant construct.
- fixation element 410 can have any of the features or attributes of fixation elements 10 , 110 , 210 , and/or 310 .
- Fixation element 510 in yet another embodiment is disclosed.
- Fixation element 510 may include attributes or features from any of fixation elements 10 , 110 , 210 , and/or 310 , wherein an attachment portion 514 is not centered with respect to head portion 512 , or is beneath one channel (e.g. channel 522 ) of head portion 512 .
- fixation element 510 includes a second attachment portion 514 a connected to head portion 512 .
- head portion 512 can include a hole H′ communicating with channel 524 and extending from bottom surface 556 through head portion 512 .
- Attachment portion 514 a can be similar to attachment portion 214 or 314 , in which case the features of fixation elements 210 and/or 310 providing for connection between the respective attachment portions and head portions would be included in fixation element 510 .
- attachment portion 514 a may be a standard bone screw with a curvate head 562 and an internal print 564 , that could rest against the lower edge of the hole H′.
- an additional hole 580 may be provided that communicates with hole H′, and is threaded to accommodate a set screw (not shown) therein, which can lock attachment portion 514 a within hole H′ in a desired orientation.
- Fixation element 510 is attached to a bone in substantially the same fashion as described above, except an additional hole must be drilled in a bone to accommodate attachment portion 514 a .
- attachment portion 514 can be threaded into the bone, and attachment portion 514 a can then be threaded into the second hole in the bone and used to make adjustments in the positioning of fixation element 510 with respect to the bone.
- One or more rods may be inserted in channels 522 and 524 , and fixation element 510 locked with respect to the rods by threading set screws down on them, as described above.
- Fixation element 610 has a U-shaped head portion 612 with a single channel 622 therethrough, and is connected to an attachment portion 614 which in a specific embodiment is a threaded screw portion.
- Walls 632 and 634 of channel 622 include threads 640 for accommodating a set screw 644 .
- Walls 632 and 634 are of a height that enables insertion of two separate rods within channel 622 of head portion 612 .
- the height of walls 632 and 634 would be at least 11 mm plus the height of set screw(s) 644 .
- rod R 1 is placed within channel 622 , followed by a set screw 644 , screwed into thread 640 .
- a second rod R 2 would be placed atop set screw 644 , and a second set screw 644 would be threaded into threads 640 to lock the second rod R 2 with respect to head portion 612 .
- the diameters of rods R 1 and R 2 could be equal or they may be different to provide adjustability and stability prior to final locking down as described above. It will also be noted that a configuration of head portion 612 to accommodate two rods may be combined with a multi-axial head portion/attachment portion connection (such as those shown in U.S. Pat. No. 5,797,911 to Sherman et al. and U.S. Pat. No. 6,280,445 to Barker et al., the entireties of which are incorporated herein by reference), or could be rotational with respect to each other as shown above with respect to fixation member 210 .
- a multi-axial head portion/attachment portion connection such as those shown in U.S. Pat. No. 5,797,911 to Sherman et al. and U.S. Pat. No. 6,280,445 to Barker et al., the entireties of which are incorporated herein by reference
- channel 622 is shown as extending from a back or proximal surface of head portion 612 toward attachment portion 614 , it will be understood that channel 622 could extend laterally, i.e. from a side surface of head portion 612 toward an opposite side surface. Two rods or other elongated members could then be inserted into channel 622 from the side and fixed with respect to head portion 612 substantially as described above, or as described further below with respect to FIGS. 10 and 11.
- FIG. 10 Yet a further embodiment is shown in FIG. 10.
- a fixation element 710 is provided with a head portion 712 and an attachment portion 714 .
- head portion 712 has channels 722 and 724 .
- Channel 722 like channel 22 in FIG. 1, is substantially straight, extends through head portion 712 , and is open to the back (i.e. the portion opposite attachment portion 714 ) of head portion 712 .
- Channel 724 is also substantially straight and extends through head portion 712 , but channel 724 opens to the side of head portion 712 .
- head portion 712 has one channel that is “back-loading” for one elongated member (e.g. rod R 1 in FIG. 4 or 9 ) and “side-loading” for another elongated member (e.g. rod R 2 in FIG. 4 or 9 ).
- Head portion 712 may also include a hole 782 from the back of head portion 712 to channel 724 .
- Hole 782 may be internally threaded and accommodate a set screw 784 , which is used to lock a rod within channel 724 .
- set screw 784 has a threaded portion 786 , and may also have a conically-shaped or tapered end portion 788 . It will be understood that any of several types of holder or locking member, including a set screw 744 (threaded into hole 782 or into channel 724 from the side of head portion 712 ) or other holder(s) described above, can be used.
- Channel 722 is configured to accommodate a holder such as set screw 744 or other holder(s) described above.
- Head portion 712 is shown in this embodiment to be fixed with respect to attachment portion 714 , with attachment portion 714 substantially in the middle of head portion 712 .
- attachment portion 714 may be rotatably or multi-axially connected to head portion 712 , or located toward one side of head portion 712 , or multiple attachment portions 714 may be provided, as described in detail above.
- Fixation element 810 is much like fixation element 710 , with the exception that both channels 822 and 824 are open to the sides of head portion 812 of fixation element 810 .
- holes 882 a and 882 b are provided to communicated with channels 822 and 824 .
- Holes 882 a and 882 b may be internally threaded (as described above) to accommodate set screws such as 884 a and 884 b , or may be configured to accommodate alternative holders, as described above.
- attachment portion 814 of fixation element 810 may be rotatably or multi-axially connected to head portion 812 , or located toward one side of head portion 812 , or multiple attachment portions 814 may be provided, as described in detail above.
- the implants described above are preferably made from a biocompatible material such as stainless steel, titanium, plastics or other sturdy biocompatible and/or resorbable materials.
- the elongated members may be flexible or rigid rods, cables or similar items. It is envisioned that well-known open and minimally-invasive surgical procedures may be used to implant embodiments of the present invention.
- the size of the implants described above may be identical or similar to implants currently used in spinal and other orthopedic surgeries. It has been found that the implants described above may have particular application to smaller vertebrae or other bones (e.g. those in children or other small persons, or adult cervical vertebrae), since one implant attaching to a bone can accommodate two rods or other elongated members. Accordingly, these implants may be made in standard and smaller sizes for such uses.
- one of the channels of fixation element 10 would be of a height sufficient to place one rod atop another in that channel, as described with respect to fixation element 610 . Still further, it will be seen that the channel or channels may be differently oriented, as for example opening to the side of the head portion.
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Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/313,171 US20040111088A1 (en) | 2002-12-06 | 2002-12-06 | Multi-rod bone attachment member |
JP2004559426A JP4441407B2 (ja) | 2002-12-06 | 2003-12-08 | 複数ロッドの骨取り付け部材 |
EP03783802A EP1572016B1 (de) | 2002-12-06 | 2003-12-08 | Knochenfixation mit mehreren stäben |
AT03783802T ATE429866T1 (de) | 2002-12-06 | 2003-12-08 | Knochenfixation mit mehreren stäben |
PCT/US2003/038956 WO2004052217A2 (en) | 2002-12-06 | 2003-12-08 | Multi-rod bone attachment |
DE60327464T DE60327464D1 (de) | 2002-12-06 | 2003-12-08 | Knochenfixation mit mehreren stäben |
AU2003291207A AU2003291207B2 (en) | 2002-12-06 | 2003-12-08 | Multi-rod bone attachment |
CA002508558A CA2508558A1 (en) | 2002-12-06 | 2003-12-08 | Multi-rod bone attachment |
US14/096,370 US9615867B2 (en) | 2002-12-06 | 2013-12-04 | Multi-rod bone attachment member |
US15/483,824 US10463412B2 (en) | 2002-12-06 | 2017-04-10 | Multi-rod bone attachment member |
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CA2508558A1 (en) | 2004-06-24 |
DE60327464D1 (de) | 2009-06-10 |
EP1572016A2 (de) | 2005-09-14 |
JP2006508770A (ja) | 2006-03-16 |
US9615867B2 (en) | 2017-04-11 |
US20170209182A1 (en) | 2017-07-27 |
US20140094858A1 (en) | 2014-04-03 |
ATE429866T1 (de) | 2009-05-15 |
JP4441407B2 (ja) | 2010-03-31 |
US10463412B2 (en) | 2019-11-05 |
AU2003291207A1 (en) | 2004-06-30 |
EP1572016B1 (de) | 2009-04-29 |
WO2004052217A3 (en) | 2004-10-28 |
WO2004052217A2 (en) | 2004-06-24 |
AU2003291207B2 (en) | 2009-07-16 |
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