CA2064222A1 - Pedicle screw and receiver member therefore - Google Patents

Pedicle screw and receiver member therefore

Info

Publication number
CA2064222A1
CA2064222A1 CA002064222A CA2064222A CA2064222A1 CA 2064222 A1 CA2064222 A1 CA 2064222A1 CA 002064222 A CA002064222 A CA 002064222A CA 2064222 A CA2064222 A CA 2064222A CA 2064222 A1 CA2064222 A1 CA 2064222A1
Authority
CA
Canada
Prior art keywords
head
segment
screw
spherical
bore
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
CA002064222A
Other languages
French (fr)
Inventor
Lutz Biedermann
Jurgen Harms
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6385442&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2064222(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2064222A1 publication Critical patent/CA2064222A1/en
Abandoned 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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7008—Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded 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
    • 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor

Abstract

Disclosed is a pedicle-screw holder designed to be linked by joint with a screw (2) having a threaded shaft (3) and a sphere-segment head (4) and with a rod (16). In order to lower the cost of stocking screws of different shaft lengths and shaft diameters, the holder has a holder space (7) inside it, at one end of which is a bore (8) through which the threaded shaft (3) passes and, adjacent to the bore, on the inside, a hollow sphere-segment section (9) against which the head of the screw (2) to be held rests, and at the end remote from the bore (8) an opening (10) through which the screw (2) can be inserted. The invention also calls for a pressure element (18) which, when screw and holder are assembled, hexerts a force on the screw head such that the head is pressed against the hollow sphere-segment section. The new holder means that only screws with very different shaft dimensions have to be stocked since screws can be inserted in common holders.

Description

2 ~ 2 ~. -.,.:

,.

~. .
. .
PEDICLE SCREW AND RECEIVER MEMBER THEREFORE ~ ~, , .

The invention relates to a receiver member for a pedicle ~ .
screw for a hinged connection of a screw which comprises :
a threaded shaft piortion and a spherical or spherical-segment-sha~ped head, with a rod as well as a pedicle screw 5 ~for stabilisat10n o~ spinal column segments. .

The DE-AS 26~49 042 discloses a pedicle screw comprising a threaded portion and a receiver member rigidly connec~ted ;~
B to the head~end thereof. A plurality of pairs of such screws are screwed into the vertebra in a respective ~:
B`d1~stance ~rom each other ~on both sidès of the~ spinal c~al~umn~.~T~he~indivicual receiver members comprise receiver :;, s~l~its.~A~respective threaded rod is passed thro~gh the .
receiver sli~ts of the right and left, resp., group of .~`~
lS~ ;scr~ews.~ By means of locking~screws the rod is then located - 2 - 2~ 22~

at the respective receiver member. A drawback of this ;
solution consists in the difficulty to rigidly screw the screws into the vertebra and at the same time exactly place the screws in two planes such that the axes of the receiver slits in the superposed or stacked receiver members are aligned such that the threaded rod can be passed through the receiver slits without distorting the screws. Already the attempt to do this requires a lot of time which is a serious drawback for an operation at the spinal column. Further, such an exact alignment can hardly be achieved. As a result considerable sheering forces act upon the threaded rods which may even cause breaking of the rods during later use after the end of the operation.
The EP 0 242 708 A discloses a pedicle screw consisting of the screw proper having a threaded shaft portion and ;
a spherical or spherical-segment-shaped head and of a receiver member hingedly connected thereto. The receiver member comprises two head halves which are retained by means of a ring and which comprise on their facing inner sides portions formed as segments of a hollow sphere which -surround the head in assembled state such that the-head is retained in the thus formed hollow sphere allowing a pivoting movement around the center of the hollow sphere. This provides a very well operating pedicle screw. ;
However, in an operation screws of different lengths and eventually also different diameters are required. When using this known screw, it is necessary to have the entire screws in the desired sizes on stock. However, ~he stock-;ng costs for suc~h complete screws are very high because of~the required;high precision of the two shell halves having the two spherical-segment-shaped portions and of the ring retaining these parts.
It is the object of the invention to provide a possibility for reducing the stocking costs of such screws.

2 ~ 2 2 2 This object is achieved by means of a receiver member according to claim 1.

A pedicle screw formed with such a receiver member is ~`
characterized in claim 2. `~

Further embodiments of the invention are characterized ~' in the subclaims. , - -The invention achieves that only the screw shafts with various lengths and thicknesses, but uniform heads must be stocked. The stocking costs are considerably reduced thereby.
,:.
lS Further features and objects of the invention will stand `
out from the description of an embodiment with reference ;
to the drawings. In the drawings j ., . . ,:
Fig. 1 shows an exploded side view of the pedicle screw with receiver member, partly in sectional ~ representation, and :
Fig. 2 shows a section through the receiver member with the screw being inserted and the rod being connected with the receiver member, in an ~"i : ~ . ... ...
enlarged representation.

Fig. 3 shows a side view from a direction turned by ~;;
90 around the axis of symmetry with respect 30 ~ ~ t~o the representation of Fig. 1 on an enlarged scale. ` '~

The pedlcle~screw 1 comprlses the actual screw 2 having a thre~ade~d~shaft part 3 and a spherical segment-shaped 35~ head 4 formed~unitarily therewith, as well as the receiver ;~
member~5.

; ~3 ~

2 ~ 2 2 ~, The receiver member 5 comprises a housing 6 for receiving the screw 2. The housing has a receiver chamber 7 therein.
In axial direction of the receiver chamber this chamber is defined at one end thereof by a bore 8 having a diameter which is smaller than twice the radius of the spherical-segment-shaped portion of the head 4. A portion 9 in the form of a hollow spherical segment is provided in the interior immediately adjacent to the bore. The radius of this portion is substantially equal to the radius of the spherical segment-shaped portion of the head 4. The hollow spherical-segment-shaped portion 9 changes directly to a hollow cylindrical portion 11 ex-tending to an aperture 10 opposite to the bore ~. The diameter of the portion 11 is slightly larger than twice the radius of the spherical-segment-shaped portion of the head 4 by such an amount that the head 4 can be in-serted, when inserting the screw 2 i nto the receiver member, into the position shown in FigO 2 in which the head contacts the hollow spherical-segment-shaped portion 20 9. As in particular shown in Fig. 2 the bore 8 is aligned coaxially to the axis of the cylindrical portion and has, viewed from inside to outside, the form of a cone portion with outwardly flaring or diverging wall. This enaôles a swinging movement of the inserted screw around the axis 25 of the hollow cylindrical portion within an angular range defined by the diameter of this cone portion.

The housing has two receiving slits 12, 13 provided in a '~
distance ~rom the hollow spherical-segment-shaped portion 9 and mutually offset or displaced by 180. The receiver slits 12, 13 extend parallel to the axis o~ the hollow cylindrical portion 11 and open towards the aperture 10.
Each receiving slit has a respective recess 14, 15 at : .
the outside in the same manner as the pedicle screw de-scribed in the aforementioned EP 0 242 708 A. The width of the receiving slits is selected such that a threaded :
:

- 5 - ~ 2 ~

rod to be received may loosely be passed therethrough.
As best shown in Fig 1, the housing further comprises two slits 17 which are offset around the axis of symmetry of the housing by 90~ with respect to the recei~ing slits 12, 13 and which extend from the aperture 10 about to the inner edge of the receiver chamber 7.
.
Further, a compression member 18 formed as a cylindrical insert is provided. The outer diameter of the cylinder is substantially equal to the inner diameter of the hollow cylindrical portion 11 and slightly smaller by such a small amount that the compression member can slide within I
the hollow cylinder. As best shown in Fig. 1, the com-pression member is preferably formed as a hollow cylinder.
The end thereof facing the hollow spherical-segment-shaped portion when inserting the compression member into the housing 6 also has a por-tion 19 formed as a hollow spherical segment. The radius of curvature thereof sub- ;
stantially equals the radius of curvature of the hollow spherical-segment shaped portion 9 and the radius of the spherical-segment-shaped portion 4.

The compression member 18 further comprises two receiving slits 20, 21 corresponding to the receiving slits 12, 13 for receiving the threaded rod 16. The receiving slits 20, 21 extend parallel to the axis of symmetry of the compression member in a distance From the hollow spheri- ;
cal-segment-sh~ped portion 19 to the opposite aperture ;
22 of the compression member. Again, two opposite slits `
23 are provided offset around the axis of symmetry by 90 with respect to the receiving slits. The slits 23 start from a position immediateiy above the hollow ;
spherical-segment-shaped portion 19 and open to the opposite side.

- 6 - ~ 2 Further, nuts 24, 25 are provided which serve the purpose of connec-ting the rod 16 with the pedicle screw in the manner shown in Fig. 2 Basically it is possible to form the head ~ in the shape of a sphere on the side thereof facing away from the threaded shaft portion 3. In this case, the receiving slits and the recesses in the housing .5 have to be se-lected such that the rod 16 lies in a sufficient distance above the head to prevent that the head contacts the rod or the screws holding the rod when pivoting or swivelling the screw. Preferably the end of the head facing away from the threaded shaft portion 3 has a plane surface 26 extending normally to the screw axis. A recess is pro- ;
vided therein for engagement with a screw driver tool for rotating the screw.

Before inserting the pedicle screw the screw 2 having the desired shaft diameter and length is assembled in the position shown in Fig. 2 such that the spherical-segment-shaped portion of the head rests ~ithin the hollow spherical-segment-shaped portion. Then the screw is screwed into the respective vertebra by engaging the recess within the head 4 with the appropriate tool. After this screwing-in (or before, if desired) the compression element is inserted in the manner best shown in Fig. 2 into the hollow cylindrical-shaped portion 11 such that the hollow spherical-segment-shaped portion 19 of the compression member rests on the spherical region of the head 4. The receiving slits of housing 6 and compression member 18 are aligned to be parallel with each other.
Thereafter the rod 16 to be connected thereto is inserted into the receiver slits and rigidly connected thereto by tightening the nuts 24 and 25. The base of the receiv-ing slits 20, 21 is offset towards the Free end of theslits by such an amount that an additional pushing force ,: ' ' "
, :~

- 7 ~ 2 acts onto the head 4 in direction towards the hollow ;
spherical-segment-shaped portion when tightening the nuts holding the screw. Owing to the slits 17 an~ 23 the .
cylindrical wall of the housing ~ can slightly yield such ~;~
that the clamping force acting onto the head is increased.
By providing the compression member 18 it is achieved that during such compression which is required for suf-ficient support the head is completely surrounded by a hollow spherical segment region and pressed through the ,-compression member in direction of the hollow spherical-segment-shaped portion 19 rather than pressed from the intimate contact with the hollow spherical-segment-shaped portion 19 into the interior. Thereby a rigid lock of the adjusted angular position is achieved. ;
.: .' '' :'~ ' ;~ ''' - : ~
, : :

~ , , 1" , , , ,., ', ,: ",, , , ' ' " , ' '':',: ' ',, ,

Claims (8)

1. Receiver member for a pedicle screw for jointly con-necting a rod (16) with a screw (2) comprising a threaded shaft portion (3) and a spherical or spherical-segment-shaped head (4), comprising a receiver chamber (7) therein, the receiver chamber having a bore (8) at one end thereof for passing the threaded shaft portion (3) therethrough, an inner hollow spherical-segment-shaped portion (9) adjacent to the bore (8) for supporting the head (4) of the screw (2) to be received therein and an aperture (10) on the side thereof opposite the bore for inserting the screw (2), and further comprising a compression member (18) exerting a force onto the head in assembled state such that the head is pressed against the hollow spherical-segment-shaped portion (9).
2. Pedicle screw (1) For stabilizing spinal column seg-ments, comprising a threaded shaft portion (3) and a receiver member (5) jointly connected to the head portion thereof for receiving a rod (16), a spherical or spherical-segment-shaped head (4) at the end of the threaded shaft portion, a receiver chamber (7) within the receiver member (5), the receiver chamber (7) having at one end thereof a bore (8) for passing the threaded shaft portion (3) therethrough, followed by an inner hollow spherical-segment-shaped portion (9) for support of the head (4) and an opening (10) at the side thereof opposite to the bore for inserting the threaded shaft portion (3) with the head (4), and further comprising a compression member (18) exerting a force onto the head in assembled state such that the head is pressed against the hollow spherical-segment-shaped portion (9).
3. Member according to claim 1 or 2, characterized in that the receiver member (5) comprises in the portion thereof facing away from the bore (8) at least one slit extending up to the open side thereof, the receiver member further comprising two mutually oppo-site slits (12, 13) for passing the rod (16) and locking the same by means of nuts (24, 25), the slits (12, 13) being angularly offset with respect to the slit (17).
4. Member according to claim 1 or 3, characterized in that the side of the compression member (18) facing the head (4) comprises a hollow spherical-segment-shaped portion (19) directed towards the head.
5. Member according to any of the claims 1 to 4, characterized in that the radii of the hollow spherical-segment-shaped portions (9, 19) and of the sphere or sphere segment (4) are substantially equal.
6. Member according to any of the claims 1 to 5, characterized in that the receiver chamber (7) has a hollow cylindrical-shaped portion opposite to the bore (8) and adjacent to the hollow spherical segment-shaped portion (9).
7. Member according to claim 6, characterized in that the compression member (18) com-prises a cylindrical portion having an outer diameter which is substantially equal to the inner diameter of the hollow cylindrical portion (11).
8. Member according to any of the claims 3 to 7, characterized in that the compression member (18) com-prises two slits (20. 21) corresponding to the receiving slits and having a base which extends away from the edge engaging the head by such a distance that an additional compression force acts onto the head in direction towards the hollow spherical-segment shaped portion when tighten-ing the nuts holding the rod.
CA002064222A 1989-07-20 1990-07-19 Pedicle screw and receiver member therefore Abandoned CA2064222A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3923996.9 1989-07-20
DE3923996A DE3923996A1 (en) 1989-07-20 1989-07-20 RECORDING PART FOR JOINTLY CONNECTING TO A SCREW FOR MAKING A PEDICLE SCREW

Publications (1)

Publication Number Publication Date
CA2064222A1 true CA2064222A1 (en) 1991-01-21

Family

ID=6385442

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002064222A Abandoned CA2064222A1 (en) 1989-07-20 1990-07-19 Pedicle screw and receiver member therefore

Country Status (9)

Country Link
US (1) US5207678A (en)
EP (1) EP0483242B1 (en)
JP (1) JPH04506759A (en)
AT (1) ATE121921T1 (en)
CA (1) CA2064222A1 (en)
DE (2) DE3923996A1 (en)
DK (1) DK0483242T3 (en)
ES (1) ES2074578T3 (en)
WO (1) WO1991001115A1 (en)

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US5207678A (en) 1993-05-04
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ATE121921T1 (en) 1995-05-15
DE3923996C2 (en) 1993-08-26

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