WO2005016161A1 - Dispositivo de fijación vertebral para tratamiento de la espondilolistesis - Google Patents
Dispositivo de fijación vertebral para tratamiento de la espondilolistesis Download PDFInfo
- Publication number
- WO2005016161A1 WO2005016161A1 PCT/ES2003/000338 ES0300338W WO2005016161A1 WO 2005016161 A1 WO2005016161 A1 WO 2005016161A1 ES 0300338 W ES0300338 W ES 0300338W WO 2005016161 A1 WO2005016161 A1 WO 2005016161A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tulip
- screw
- bar
- fixation device
- spondylolisthesis
- Prior art date
Links
- 208000007103 Spondylolisthesis Diseases 0.000 title claims abstract description 16
- 238000011282 treatment Methods 0.000 title claims abstract description 12
- 241000722921 Tulipa gesneriana Species 0.000 claims abstract description 46
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims description 2
- 241000220317 Rosa Species 0.000 abstract 1
- 238000002513 implantation Methods 0.000 description 6
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 2
- 206010029174 Nerve compression Diseases 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000011477 surgical intervention Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Classifications
-
- 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
- A61B17/7002—Longitudinal elements, e.g. rods
-
- 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
Definitions
- the present invention relates to a vertebral fixation device belonging to the field of bone surgery especially designed for the treatment of spinal conditions and more specifically of spondylolisthesis. It is an object of the invention that after implanting a screw on the vertebra, a tulip associated with said screw is selected that is the most appropriate depending on the height or displacement of the vertebra.
- the tulips have a polyaxial orientation, which allows them to regulate and fix a bar at a distance from the vertebra that acts as a bridge between the other fixations associated with other vertebrae. Said tulip allows a clamping of the bar at the bottom forming a block so that neither the bar nor the vertebra can move.
- Spondylolisthesis consists of a sliding of one vertebra over another either forward (anterior) or backward (retrolisthesis) that in any case determines that a vertebra is not aligned with the others causing pain and nerve compression.
- the implantation of screws that are fixed on different vertebrae are usually used and linked by means of a bar on which a traction is applied to hold or try to correct the displacement between vertebrae.
- This invention basically comprises a spherical head screw, a tulip capable of receiving at the head of the screw, a lower bowl that is fixed to the screw and that has a housing on which the bar that protrudes through recesses of the tulip sits , the bar being conveniently fixed by means of another upper bowl on which a threaded plug which establishes the definitive fixation of the assembly is located.
- a housing intended for the introduction of an Alien key to facilitate the implantation of the screw in the bone prior to the implantation of the rest of the mechanisms of the device.
- the vertebral fixation device that constitutes the object of the present invention offers the possibility of optimizing the systems previously used for fixation on the vertebrae and treating the spondylolisthesis.
- the screw conventionally has a spherical head in which there is a cavity for introduction of the tool that facilitates the rotation and consequent implantation of the screw in the vertebra.
- Associated with the head is an essentially spherical rosette with axial grooves that ends in a conical upper promontory, a rosette that is intended to embrace the head of the screw in order to link it to an internal spherical cavity of a tulip giving it the polyaxial movement while not fastened by the tightening screw.
- a threaded section is extended in which a clamping screw plays on the upper promontory of the rosette to fix the position of the rosette in said spherical cavity. If it is intended to disassemble the screw with respect to the tulip, the tightening screw must first be unscrewed and then the appropriate tool for this purpose must be introduced through opposite transverse holes that have been practiced in the corresponding tulip with the position of the conical upper promontory.
- the tulip shows externally in its lower sector a thread fillet intended for the threading of an external support nut that constitutes the contact surface on which the bar rests, which in turn crosses opposite vertical recesses defined in the upper sector of the tulip .
- a threaded section is defined in which a screw cap plays that can exceed the tulip, that is, it has a suitable open shape to allow the tulip to protrude from above and presses on its bottom face on the bar.
- the height of the bar or distance from the bone is adjusted by adjusting the nut on which the bar rests until the required height is obtained, then proceeding to fix the position of the bar by tightening the screw cap on said bar.
- an essentially cylindrical outer cup that has axially oriented flanges on its upper face and that engage in a defined recess in the screw cap, so that the rotation of the screw cap determines the joint displacement in the direction vertical of the bowl, said bowl counting with curved openings facing its side wall that fit over the bar.
- it has on its upper face a cavity with a suitable shape and dimensions for the introduction of the corresponding tool.
- Figure 1. Shows a perspective view of the vertebral fixation device for the treatment of spondylolisthesis.
- Figure 2.- Shows an elevation view of the device object of this invention.
- Figure 3. Shows a sectional view according to B-B of the previous figure.
- Figure 4. Shows an elevation view of the tulip belonging to the device of the invention.
- Figure 5. Shows a sectional view according to A-A of the previous figure.
- Figure 6. Shows a perspective view of the rosette. PREFERRED EMBODIMENT OF THE INVENTION
- the vertebral fixation device for the treatment of spondylolisthesis that constitutes the object of this invention is based on the basic incorporation of a screw (1) that has a spherical head intended for fixation on a bone, a tulip (2) incorporating: vertical recesses (3) facing each other in which there is a bar (4) that constitutes the link between screws (1) of other devices, and an internal threaded sector (21) in which a threaded plug (5) plays which rests against the bar (4) and drags in its displacement to an outer bowl (6).
- the fixing device stands out because the tulip (2) houses a cavity (7) inside and below, delimited by a spherical upper wall (7 ') and a conical lower wall (7''), in the a rosette (8) formed by an upper promontory (9) showing a conical section (9 ') topped by another cylindrical section (9'') that serves as a guide for movement inside the tulip is placed, and showing its upper face (9 1 '') smooth or with a slight roughness, starting from this upper promontory (9) inferiorly from a series of flexible slats (10), separated by grooves (11), which define a housing in the that the head of the screw (1) is housed that will be provided with a free movement of polyaxial orientation, being provided that in a threaded sector (13) located next to the cavity (7), it displaces a tightening screw (12) that affects the upper face (9 '') of the promon upper thorium (9) of the rosette (8) to establish the closing
- the fixing device stands out because the tulip (2) incorporates in its outer face a thread fillet (14) intended for threading a support nut (15) on whose upper face the surface on which the bar rests ( 4), so that the rotation of the support nut (15) determines the displacement in height of the bar (4) with respect to the bone to which the screw (1) is screwed, the bar (4) being fixed between the support nut (15) and the screw cap (5) that tightens on the bar (4).
- the tulip (2) incorporates two transverse drills (17) facing in correspondence with the position of the upper promontory (9) of the rosette (8) inside the tulip (2), which facilitates the passage of two tools to influence said upper promontory (9) and raise the rosette (8) that will thus detach from the screw head (1) allowing the latter to be disassembled.
- the threaded cover (5) has a cavity (18) in its upper face in which the corresponding tool is introduced to facilitate its rotation that causes the vertical displacement of the bowl (6) linked to the threaded cover (5) by middle of paths folded plates (19) that are housed in a recess (20) of the threaded cover (5), circular openings (21) being supported on the bar (4) being defined on the side wall of the bowl (6) the guided displacement of the latter in the vertical recesses (3) of the tulip (2).
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/584,812 US7291151B2 (en) | 2003-07-25 | 2003-07-25 | Vertebral fixation device for the treatment of spondylolisthesis |
PCT/ES2003/000338 WO2005016161A1 (es) | 2003-07-25 | 2003-07-25 | Dispositivo de fijación vertebral para tratamiento de la espondilolistesis |
AU2003304415A AU2003304415A1 (en) | 2003-07-25 | 2003-07-25 | Vertebral fixation device for the treatment of spondylolisthesis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/ES2003/000338 WO2005016161A1 (es) | 2003-07-25 | 2003-07-25 | Dispositivo de fijación vertebral para tratamiento de la espondilolistesis |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005016161A1 true WO2005016161A1 (es) | 2005-02-24 |
Family
ID=34178745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2003/000338 WO2005016161A1 (es) | 2003-07-25 | 2003-07-25 | Dispositivo de fijación vertebral para tratamiento de la espondilolistesis |
Country Status (3)
Country | Link |
---|---|
US (1) | US7291151B2 (es) |
AU (1) | AU2003304415A1 (es) |
WO (1) | WO2005016161A1 (es) |
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Also Published As
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---|---|
AU2003304415A1 (en) | 2005-03-07 |
US7291151B2 (en) | 2007-11-06 |
US20060293659A1 (en) | 2006-12-28 |
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