GB2365345A - A pedicle attachment assembly - Google Patents

A pedicle attachment assembly Download PDF

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Publication number
GB2365345A
GB2365345A GB0109464A GB0109464A GB2365345A GB 2365345 A GB2365345 A GB 2365345A GB 0109464 A GB0109464 A GB 0109464A GB 0109464 A GB0109464 A GB 0109464A GB 2365345 A GB2365345 A GB 2365345A
Authority
GB
United Kingdom
Prior art keywords
pedicle
assembly
cap
head
saddle
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.)
Granted
Application number
GB0109464A
Other versions
GB0109464D0 (en
GB2365345B (en
Inventor
Derek Redvers Cooper
Simon Nicholas Collins
Ian James Emslie
David Mark Fletcher
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.)
Corin Ltd
Corin Spinal Systems Ltd
Original Assignee
Corin Ltd
Corin Spinal Systems Ltd
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
Priority claimed from GB0017924A external-priority patent/GB0017924D0/en
Application filed by Corin Ltd, Corin Spinal Systems Ltd filed Critical Corin Ltd
Priority to EP01304283A priority Critical patent/EP1174092A3/en
Publication of GB0109464D0 publication Critical patent/GB0109464D0/en
Priority to US09/893,704 priority patent/US6626908B2/en
Publication of GB2365345A publication Critical patent/GB2365345A/en
Application granted granted Critical
Publication of GB2365345B publication Critical patent/GB2365345B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

The pedicle attachment assembly comprises a pedicle attachment device 10 having a head 16. A polyaxial housing 11 has a through bore 17 comprising a base portion 18 and two posts 19 upstanding from the base portion, the posts defining therebetween a slot 20 for receiving a rod 14. A saddle-shaped element 12 is disposable in the slot and has a part cylindrical recess 22 in an upper surface for engagement in use with the rod. The saddle-shaped element has a convex lower portion 23 for engagement in a complimentary concave recess 16<U>c</U> in an upper surface of the head of the attachment device. The lower surface of the head of the attachment device 16<U>a</U> and the lower end of the through bore 17<U>a</U> in the housing have complementary part spherical surfaces for engagement with one another. A cap assembly 13 is provided for clamping the rod in the housing.

Description

2365345 A PEDICLE ATTACHMENT ASSEMBLY This invention relates to a pedicle
attachment assembly for use in conjunction with a rod for immobilising bone segments, particularly in the spine, so as to allow the segments to fuse together.
To achieve bone fusion or arthrodesis a stable environment has to be created.
The pedicle attachment and rod assembly immobilises the bony junction so that bone graft of bone substitute material which is placed across the junction can consolidate.
This consolidation process takes place during the healing process and creates a bony bridge or solid fusion mass across and between the bony junction. The process of arthrodesis has been well documented in the field of batch mechanics and traumatology.
According to a first aspect of the present invention there is provided a pedicle attachment assembly comprising a pedicle attachment device having a head, a polyaxial housing having a through bore and comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod, a saddle-shaped element disposed or disposable in the slot and having a part cylindrical recess in an upper surface for engagement in use with the rod, the head of the attachment device and the lower end of the through bore having interengageable first portions and the head of the attachment device and the saddle- shaped element have interengageable second portions, the first portions and the second portions being shaped to allow the attachment device to pivot relative to the housing and the saddle-shaped element, and a cap assembly for use in clamping the rod in the housing.
Preferred andlor optional features of the first aspect of the invention are set out in claims 2 to 11.
According to a second aspect of the invention there is provided a pedicle screw assembly comprising a pedicle screw having a threaded stem and a head of larger diameter than the stem, a polyaxial housing having a through bore and comprising a base portion and two posts upstanding from the base portion, the posts defnifing therebetween a slot for receiving a rod, a saddle-shaped element disposed or disposable in the slot and having a part cylindrical recess in an upper surface for engagement in use with the rod, the lower surface of the head of the screw and the lower end of the through bore in the housing having complementary part spherical or substantially part spherical surfaces for engagement with one another, and a cap assembly for in use clamping the rod in the housing, the cap assembly comprising a cap having an internally threaded skirt portion for threadably engaging external threads provided on the two posts and a top portion having an internally threaded aperture, and a set screw engageable in the internally threaded aperture so that diametrically opposed regions of the lower edge of the cap and the set screw in use provide three point clamping between the rod and the cap assembly.
A preferred or optional feature of the second aspect of the invention is set out in claim 13.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view through one embodiment of a pedicle attachment assembly according to the present invention, Figure 2 is a perspective view of the saddle-shaped element of the pedicle attachment assembly shown in Figure 1, and -3 Figure 3 is a sectional view through another embodiment of a pedicle attachment assembly according to the present invention.
Referring to Figures 1 and 2 of the drawings, the pedicle attachment assembly shown therein is intended to be secured to bone segments of a patient's spine and comprises a pedicle attachment device in the form of a screw 10, a polyaxial housing 11, a saddle-shaped element 12 and a cap assembly 13. Figure 1 also shows a rod 14 which is clamped to two or more pedicle screw assemblies secured to different bone segments of the spine to immobilise the segments and allow the segments to fuse together. The assembly is typically formed of titanium.
Ile pedicle screw 10 comprises a threaded stem 15 and a head 16 having a diameter larger than the stem.
The polyaxial housing 11 has a through bore 17 and comprises a base portion 18 and two posts 19 upstanding from the base portion, the posts 19 defining therebetween a slot 20 for receiving the rod 14. The base of the slot 20 is indicated by the reference numeral 21.
The through bore 17 has a diameter, apart from at its lowermost end, sufficient to allow the stem 15 and head 16 of the pedicle screw 10 to pass therethrough. However, the lowermost end 17a of the through bore 17 is of part spherical shape and the diameter of the opening at the lowermost end of the through bore is sufficient to allow the stem 15 but not the head 16 of the pedicle screw to pass therethrough.
The lower surface 16a of the head 16 of the screw 10 is of part spherical shape so as to be complementary with the shape of the lowermost end 17a of the through bore. This enables the screw 10 to tilt in any direction with respect to the housing 11.
The saddle-shaped element 12 is disposed in the slot 20 of the housing and extends across the entire width of the housing 11 and into the gaps between adjacent free side edges of the posts 19. This ensures that the saddle-shaped element 12 cannot be angularly displaced relative to the housing 11.
The saddle-shaped element 12 has a part cylindrical recess 22 in its upper surface, the recess 22 extending the longitudinal extent of the element 12, for engagement with the rod 14. By virtue of the fact that the saddle-shaped element 12 cannot be angularly displaced within the housing 11, the part cylindrical recess 22 is always correctly orientated to engage with the rod 14. The saddle-shaped element 12 has a convex and preferably a part spherical lower portion 23 for engagement in a complementary concave and preferably part spherical recess 16c in the head 16 of the screw 10. This enables the screw 10 to pivot with respect to the housing 11 and the saddle-shaped element 12 without vertical displacement of the saddle- shaped element 12 relative to the screw head 16 particularly where the lower portion 23 and recess 16c are part spherical. As an alternative to the above arrangement, the saddle-shaped element may have a concave and preferably a part spherical recess for engagement with a complementary convex and preferably part spherical portion on the head of the screw.
The posts 19 have a stepped external diameter and the smaller diameter ends are uppermost and are externally threaded.
The cap assembly 13 comprises a cap, having a main portion 24 and a collar 25, and a set screw 26. The main portion 24 of the cap comprises a skirt portion 24a -5and a top portion 24b. The skirt portion 24a is internally threaded for threadable engagement with the external threads on the upper parts of the posts 19. The upper portion 24b of the cap has a central internally threaded aperture 27 threadably engageable with an external thread on the set screw 26.
The collar 25 is of stepped internal diameter, the lower end being of smaller diameter than the upper end and corresponding in diameter to the internal diameter of the skirt portion of the cap. The collar is a push fit over an externally stepped lower portion of the cap and serves to provide, when in use contacting the rod 14, a stationary or substantially stationary downwardly directed clamping force onto the rod 14 as the main portion 24 of the cap assembly 13 is being tightened.
In use, the screw 10 is fitted in the housing 11 and the screw is then screwed into the bone. In order to enable this to be done, the head of the screw 10 may be provided with cross slots which are engaged by a screwdriver portion of a special tool.
A sleeve on the tool engages the extemal thread on the posts 19 thus pulling the screwdriver portion and screw together and rigidly locking the screw 10 and housing 11 together in the same axis during implantation. Once the screwdriver has been released, the housing 11 will be left free to articulate on the screw head.
The saddle-shaped element 12 is then placed in the slot 20 between the posts 19 of the housing 11. The rod 14 is then placed in the slot 20 to come into contact with the part cylindrical recess 22 in the upper surface of the saddle- shaped element 12.
The cap assembly 13 is then screwed down onto the posts 19 and finally the set screw 26 is screwed into the aperture 27. Diametrically opposed regions of the lower edge of the collar 25, together with the set screw 26, provide three point clamping between the rod 14 and the cap assembly 13.
-6 A pedicle screw assembly as described above reduces the need for accurate contouring of the rod 14.
Referring now to Figure 3 of the drawings, the pedicle attachment device comprises a hook 10 comprising a hook-shaped portion 15' (instead of a threaded stem) and a head 16'. In most other respects the attachment assembly is identical to the attachment assembly of Figures 1 and 2. However, the saddle-shaped element 12 is held captive relative to the housing 11 by providing a slight inwards step 28 in the bore 17 above the saddle-shaped element 12. Also, the collar 25 is held captive with the main portion 24 of the cap by providing the outer surface of the skirt portion 24a of the cap with a circumferentially extending lip 30 which is received in an annular groove 31 in the inner surface of the collar 25. These two modifications could also be made to the embodiment shown in Figures 1 and 2 to make the saddle-shaped element of that embodiment captive relative to the housing and to make the collar captive with the main portion of the cap.
The above embodiments are given by way of example only and various modifications will be apparent to persons skilled in the art without departing from the scope of the invention as defined in the appended claims.

Claims (9)

1. A pedicle attachment assembly comprising a pedicle attachment device having a head, a polyaxial housing having a through bore and comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod, a saddle-shaped element disposed or disposable in the slot and having a part cylindrical recess in an upper surface for engagement in use with the rod, the head of the attachment device and the lower end of the through bore having interengageable first portions and the head of the attachment device and the saddle-shaped element have interengageable second portions, the first portions and the second portions being shaped to allow the attachment device to pivot relative to the housing and the saddle-shaped element, and a cap assembly for use in clamping the rod in the housing.
2. A pedicle attachment assembly as claimed in claim 1, wherein the saddleshaped element has a convex (or concave) lower portion for engagement with a complementary concave (or convex) portion in (or on) the upper surface of the head of the attachment device.
3. A pedicle attachment assembly as claimed in claim 2, wherein the lower portion of the saddle-shaped element and the upper surface of the head of the attachment device are of complementary part spherical or substantially part spherical shape.
4. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the lower surface of the head of the attachment device and the lower end of the through bore in the housing have complementary part spherical or substantially part spherical surfaces for engagement with one another.
5. A pedicle attachinent assembly as claimed in any one of the preceding claims, wherein the saddle-shaped element extends across the entire width of the polyaxial housing and into the gaps between adjacent free side edges of the posts.
6. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the saddle-shaped element is held captive relative to the polyaxial housing.
7. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the cap assembly comprises a cap having an internally threaded skirt portion for threadably engaging external threads provided on the two posts and a top portion having an internally threaded aperture, and a set screw engageable in the internally threaded aperture so that diametrically opposed regions of the lower edge of the cap and the set screw in use provide three point clamping between the rod and the cap assembly.
8. A pedicle attachment assembly as claimed in claim 7, wherein the cap comprises a main portion including the top portion and an internally threaded part of the skirt portion and an internally stepped collar for fitting or fitted over the skirt portion.
9. A pedicle attachment assembly substantially as hereinbefore described with reference to Figure 1 and 2, or Figure 3, of the accompanying drawings.
9. A pedicle attachment assembly as claimed in clahn 7 or claim 8, wherein the collar is held captive relative to the main portion of the cap.
10. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the attachment device is a screw having a threaded stem and a head of larger diameter than the stem.
A pedicle attachment assembly as claimed in any one of claims 1 to 9, wherein the attachment device comprises a hook having a head.
12. A pedicle screw assembly comprising a pedicle screw having a threaded stem and a head of larger diameter than the stem, a polyaxial housing having a through bore and comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod, a saddle-shaped element disposed or disposable in the slot and having a part cylindrical recess in an upper surface for engagement in use with the rod, the lower surface of the head of the screw and the lower end of the through bore in the housing having complementary part spherical or substantially part spherical surfaces for engagement with one another, and a cap assembly for in use clamping the rod in the housing, the cap assembly comprising a cap having an internally threaded skirt portion for threadably engaging external threads provided on the two posts and a top portion having an internally threaded aperture, and a set screw engageable in the internally threaded aperture so that diametrically opposed regions of the lower edge of the cap and the set screw in use provide three point clamping between the rod and the cap assembly.
13. A pedicle screw assembly as claimed in claim 12, wherein the cap comprises a main portion including the top portion and an internally threaded part of the skirt portion and an internally stepped collar for fitting over the skirt portion.
14. A pedicle attachment, assembly substantially as hereinbefore described with reference to Figure 1 and 2, or Figure 3, of the accompanying drawings.
o Amendments to the claims have been filed as follows CLAIMS A pedicle attachment assembly comprising a pedicle attachment device having a head, a polyaxial housing having a through bore and comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod, a saddle-shaped element disposed or disposable in the slot and having a part cylindrical recess in an upper surface for engagement in use with the rod, the lower surface of the head of the attachment device and the lower end of the through bore having complementary part spherical or substantially part spherical surfaces, the head of the attachment device having a part spherical or substantially part spherical recess and the lower portion of the saddle- shaped element being part spherical or substantially part spherical for engagement in the recess in the head of the attachment device so as to allow the attachment device to pivot relative to the housing and the saddle-shaped element, and a cap assembly for use in clamping the rod in the housing.
2. A pediele attachment assembly as claimed in any one of the preceding claims, wherein the saddle-shaped element extends across the entire width of the polyaxial housing and into the gaps between adjacent free side edges of the posts.
3. A pedicle attachment assembly as claimed in claim 1 or claim 2, wherein the saddle-shaped element is held captive relative to the polyaxial housing.
4. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the cap assembly comprises a cap having an internally threaded skirt portion for threadably engaging external threads provided on the two posts and a top portion having an internally threaded aperture, and a set screw engageable in the internally threaded aperture so that diametrically opposed regions of the lower edge of 11 the cap and the set screw in use provide three point clamping between the rod and the cap assembly.
5. A pedicle attachment assembly as claimed in claim 4, wherein the cap comprises a main portion including the top portion and an internally threaded part of the skirt portion and an internally stepped collar for fitting or fitted over the skirt portion.
6. A pedicle attachment assembly as claimed in claim 4 or claim 5, wherein the collar is held captive relative to the main portion of the cap.
7. A pedicle attachment assembly as claimed in any one of the preceding claims, wherein the attachment device is a screw having a threaded stem and a head of larger diameter than ihe stem.
8. A pedicle attachment assembly as claimed in any one of claims 1 to 6, wherein the attachment device comprises a hook having a head.
GB0109464A 2000-07-22 2001-04-18 A pedicle attachment assembly Expired - Fee Related GB2365345B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01304283A EP1174092A3 (en) 2000-07-22 2001-05-14 A pedicle attachment assembly
US09/893,704 US6626908B2 (en) 2000-07-22 2001-06-29 Pedicle attachment assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0017924A GB0017924D0 (en) 2000-07-22 2000-07-22 A pedicle screw assembly
GB0108270A GB0108270D0 (en) 2000-07-22 2001-04-03 A pedicle screw assembly

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GB0109464D0 GB0109464D0 (en) 2001-06-06
GB2365345A true GB2365345A (en) 2002-02-20
GB2365345B GB2365345B (en) 2002-07-31

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US9198695B2 (en) 2010-08-30 2015-12-01 Zimmer Spine, Inc. Polyaxial pedicle screw
US9629669B2 (en) 2004-11-23 2017-04-25 Roger P. Jackson Spinal fixation tool set and method
US9636151B2 (en) 2004-02-27 2017-05-02 Roger P Jackson Orthopedic implant rod reduction tool set and method
US9636146B2 (en) 2012-01-10 2017-05-02 Roger P. Jackson Multi-start closures for open implants
US9662143B2 (en) 2004-02-27 2017-05-30 Roger P Jackson Dynamic fixation assemblies with inner core and outer coil-like member
US9662151B2 (en) 2004-02-27 2017-05-30 Roger P Jackson Orthopedic implant rod reduction tool set and method
US9668771B2 (en) 2009-06-15 2017-06-06 Roger P Jackson Soft stabilization assemblies with off-set connector
USRE46431E1 (en) 2003-06-18 2017-06-13 Roger P Jackson Polyaxial bone anchor with helical capture connection, insert and dual locking assembly
US9717534B2 (en) 2009-06-15 2017-08-01 Roger P. Jackson Polyaxial bone anchor with pop-on shank and friction fit retainer with low profile edge lock
US9717533B2 (en) 2013-12-12 2017-08-01 Roger P. Jackson Bone anchor closure pivot-splay control flange form guide and advancement structure
US9743957B2 (en) 2004-11-10 2017-08-29 Roger P. Jackson Polyaxial bone screw with shank articulation pressure insert and method
US9770265B2 (en) 2012-11-21 2017-09-26 Roger P. Jackson Splay control closure for open bone anchor
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
US9918751B2 (en) 2004-02-27 2018-03-20 Roger P. Jackson Tool system for dynamic spinal implants
US9918745B2 (en) 2009-06-15 2018-03-20 Roger P. Jackson Polyaxial bone anchor with pop-on shank and winged insert with friction fit compressive collet
US9980753B2 (en) 2009-06-15 2018-05-29 Roger P Jackson pivotal anchor with snap-in-place insert having rotation blocking extensions
US10039578B2 (en) 2003-12-16 2018-08-07 DePuy Synthes Products, Inc. Methods and devices for minimally invasive spinal fixation element placement
US10039577B2 (en) 2004-11-23 2018-08-07 Roger P Jackson Bone anchor receiver with horizontal radiused tool attachment structures and parallel planar outer surfaces
US10058354B2 (en) 2013-01-28 2018-08-28 Roger P. Jackson Pivotal bone anchor assembly with frictional shank head seating surfaces
US10064658B2 (en) 2014-06-04 2018-09-04 Roger P. Jackson Polyaxial bone anchor with insert guides
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