CA2171068C - Anchoring member - Google Patents

Anchoring member

Info

Publication number
CA2171068C
CA2171068C CA002171068A CA2171068A CA2171068C CA 2171068 C CA2171068 C CA 2171068C CA 002171068 A CA002171068 A CA 002171068A CA 2171068 A CA2171068 A CA 2171068A CA 2171068 C CA2171068 C CA 2171068C
Authority
CA
Canada
Prior art keywords
screw
head
recess
pressure member
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.)
Expired - Lifetime
Application number
CA002171068A
Other languages
French (fr)
Other versions
CA2171068A1 (en
Inventor
Jurgen Harms
Lutz Biedermann
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=7756714&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2171068(C) "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 CA2171068A1 publication Critical patent/CA2171068A1/en
Application granted granted Critical
Publication of CA2171068C publication Critical patent/CA2171068C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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)
  • Surgery (AREA)
  • Neurology (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)
  • Bipolar Transistors (AREA)
  • Finger-Pressure Massage (AREA)
  • Dowels (AREA)
  • Sheet Holders (AREA)

Abstract

An anchoring member for anchoring in a bone is provided with a bone screw having a screw member (1) comprising a threaded por-tion (2) and a head (3) with a spherical segment shaped portion, and a seat part (5) for receiving the head (3) of the screw mem-ber and a rod (15) for connection with the bone screws, whereby the seat part (5) has a first end (6) and an opposite second end (7), an axis of symmetry (8) passing through the first and se-cond end, a bore (9) for passing the threaded portion (2) there-through, the bore being coaxial with the axis of symmetry, and a first region adjacent to said first end (6) having a substanti-ally U-shaped cross-section with two free legs (11, 12) compri-sing an internal screw thread (13) for receiving the rod (15) therein, whereby the bore (9) conically tapers towards the se-cond end (7) in a second portion (16) adjacent to the second end (7) with a cone angle and whereby a pressure member (20) embra-cing the screw head (3) from its side opposite to the threaded portion (2) is provided, the pressure member having an outer surface which conically tapers towards the second end (7) in a region (24) laterally surrounding the screw head (3), the cone angle corresponding to that of the portion (16) of the bore (9).

Description

1. Lutz Biedermann 2. Professor Dr. Jurgen Harms Anchoring member The invention relates to an anchoring member according to the preamble of claim 1.

Such an anchoring member formed as a polyaxial bone screw is disclosed in the German patent 43 07 576. With this device the position of the screw member relative to the seat part is fixed by a pressure disk which acts upon the head of the screw member and which is urged against the screw of the screw member by an inserted correction rod and a rod locking screw. This creates the problem that when loosening the rod locking screw for rela-tive positioning of rod and anchoring member the lock of the head of the screw member with respect to the seat part is simul-taneously released. Thus, each time the position of the seat part on the rod connecting the vertebrae is readjusted the seat part is also moved with respect to the head of the screw member which is disadvantageous.

It is the object of the invention to provide an anchoring member which retains the lock between the head of the screw member and the seat part when adjusting the position of the seat part rela-tive to the rod.

This object is achieved by the anchoring member defined in claim 1.

Further embodiments of the invention are defined in the sub-claims.

Further features and advantages of the invention will be appa-rent from the description of embodiments with reference to the figures. In the figures:

Fig. 1 shows a cross-section of the anchoring member with a rod to be placed therein, partly in sectional representation;

Fig. 2 shows the anchoring member in detail and exploded representation; and Fig. 3 is a partly sectional presentation of the ancho-ring member with inserted screw member and pres-sure member.

As best shown in the figures 2 and 3 an anchoring member compri-ses the proper screw member 1 having a threaded shaft 2 and a head 3. The head 3 is formed as a spherical segment in the re-gion adjacent to the threaded shaft 2. The length of the head 3 in axial direction is larger than the radius of the head. The head 3 has a recess 4 for engagement with a hexogen socket screw key at its face opposite to the threaded shaft 2 and coaxially therewith.

The anchoring member further comprises a seat part 5 for recei-ving the head 3 of the screw member 1. The seat part 5 comprises a first end 6 and an opposite second end 7 as well as an axis of symmetry 8 passing through the first and second end. A bore 9 is coaxial with the axis of symmetry for passing the threaded shaft therethrough in direction from the first end. In a first region adjacent to the first end 6 the seat part 5 has a U-shaped re-cess 10 which is symmetric with respect to the axis of symmetry 8, the recess 10 having a base directed towards the second end 7 and two free lateral legs 11, 12 extending towards the first end 6. In the region of the legs 11, 12 the bore is cylindrical and the seat part has an internal screw thread 13 and an external screw thread 14. The channel formed by the U-shaped recess 10 has a size just enough to fit a rod 15 therein connecting a plu-rality of such anchoring members. At a second region adjacent tothe second end 7 the cylindrical portion of the bore 9 is follo-wed by a portion 16 tapering towards the second end 7 with a cone angle of about 4. The axial length of this portion 16 cor-responds substantially to the axial dimensions of the head 3.

At the second end the diameter of the bore 9 is considerably larger than that of the threaded shaft whereby the letter can be pivoted, when in an inserted state, around the axis of symmetry 8 within a cone angle.

A pressure member 20 acting upon the head 3 of the screw member and having a first face 21 away from the head 3 and an opposite second face 22 is provided for locating the position of the head 3 within the seat part 5. Adjacent to the first face 21 the pressure member has a substantially cylindrical first portion 23 having an outer diameter selected so as to allow an axial sliding motion of the pressure member within the bore 9 of the seat part 5. The pressure member 20 further comprises a second portion 24 adjacent to the first portion 23 and to the second face 22. The second portion 24 has an outer surface conically tapering towards the second face 22 with a cone angle corresponding to that of the portion 16 of the bore 9 within the seat part 5. A spherical segment shaped recess 25 for receiving the head 3 is formed coaxially at the second face 22 and opens towards the second end 22. The spherical segment shaped recess 25 has a radius which substantially corresponds to the radius of the head 3. The axial extension of the recess 25 is larger than the radius thereof. The wall of the pressure member 20 has four slits arranged therein in a peripherally equidistant manner and parallel to the axis, the slits opening towards the second face 22 and having an axial length which is larger than the radius of the recess 25.

The pressure member 20 further comprises, in its cylindrical first portion 23, a bore 26 providing a passage for a screwing tool engaging the recess 4. The bore 26 is coaxial with the cy-linder axis and joins the recess 25. A recess 27 having the shape of a cylinder portion and extending perpendicular to the 217106~

cylinder axis of the first portion 23 is formed in the surface of the pressure member at the first face 21 thereof. The center of curvature is on the axis of symmetry. The depth of the recess is not larger than the radius of the recess. The radius of curvature of the recess 27 corresponds to the radius of curva-ture of the base of the U-shaped recess 10 of the seat part 5.
The longitudinal slits 28 surve the purpose to bend up the coni-cal portion 24 of the pressure member embracing the head 3 so that the spherical segment shaped recess 25 of the pressure mem-ber 20 can be pushed onto the head 3 of the screw.

Countersinks 29 extending perpendicular to the axis of symmetry are provided opposite to each other on the jacket of the pres-sure member 20. Corresponding crimp bores 17 are formed in the jacket of the seat part 5.

Further, a member embracing the outside of the two lateral legs 11, 12 is provided. The member is formed as a swivel nut for lo-cating the rod 15 to be received and has an internal screw thread corresponding to the external screw thread 14 at the two legs of the seat part 5. Moreover, there is a locking member 45 formed as a threaded screw. The locking member 45 has an exter-nal screw thread 46 cooperating with the internal screw thread 13 of the legs 11, 12 for screwing the locking member into the U-shaped recess 10 of the seat part 5. The locking member 45 further has a hexagon recess 46 for engagement of a screwing tool.

All components of the described enchoring member are made of a physically friendly material, in particular of titanium.

For preparation the pressure member 20 is first pushed onto the head 3 so that the head is embraced by the edge of the spherical segment shaped recess 25. The forces generated when pushing on act to slightly bend apart the pressure member at the longitudinal slits 28 so that the screw head 3 can be inserted into the spherical segment shaped recess 25 and the pressure member snaps onto the head 3. The positive connection between the edge of the spherical segment shaped recess 25 and the screw ._ head 3 can be obtained by a following slight compression of the pressure member.

The threaded shaft 2 is then inserted into the seat part from the first end 6 thereof until the conical outer surface of the second portion 24 of the pressure member 20 frictionally engages the wall of the conical portion 16 of the bore 9. In the course of this the pressure member 20 is turned so that the axis of the partial cylindrical recess 27 is exactly in the plane of symme-try of the U-shaped channel 10 of the seat part 5. This position is locked by slight crimping by means of the crimp bores 17, 29 without impeding a sufficient movement of the pressure member 20 in direction of the axis of symmetry 8 of the seat part.

In operation the screw member is screwed in and the rod 15 is then placed into the seat part 5 by insertion from the outside into the U-shaped recess 10. After adjusting the desired posi-tion of the anchoring member relative to the rod 15, the rod is firmly clamped by tightening the swivel nut 40. As shown in par-ticular in Fig. 1, tightening of the swivel nut 40 causes a force F to be exerted through the rod 15 onto the pressure mem-ber 20 in direction of the axis of symmetry 8 so that the pres-sure member 20 is pressed into the seat part together with the screw head 3 to completely push the conical second portion 24 of the pressure member 20 into the conical portion 16 of the bore 9 of the seat part.

If the entire conical surfaces of the second portion 24 of the pressure member sit close to the surfaces of the bore 9 of the seat part, the seat part exverts, as in particular shown in Fig.
1, a force FreS onto the pressure member in a radial direction with respect to the axis of symmetry 8 which blocks a movement of the screw head within the recess 25 even if the swivel nut 40 is loosened for readjusting the position of the rod 15 relative to the seat part 5. Thus, the angular position of the screw mem-ber 1 relative to the seat part 5 remains as fixed during the preceding lock of the rod.

6 2l 7l 0 68 Since the cone angle is selected to cause self-locking of the formed connection between the conical surface of the portion 16 of the bore and the portion 24 of the pressure member, this connection cannot loosen on its own. Rather, an additional ex-ternal force of considerable extent is necessary to surmount the frictional force acting to prevent loosening.

In operation a corresponding anchoring member is arranged in each of the plurality of adjacent segments of a spinal column, whereby a precise adjustment is made segment after segment for adjusting the engagement position of the individual anchoring members at the rod relative to the longitudinal axis of the rod.
For precisely adjusting the position of the seat part relative to the rod the swivel nut 40 can again be loosened because when adjusting the position of the screw head within the seat part for making a primary adjustment of the position of the seat part relative to the rod, the pressure member is firmly pressed into the seat part 5 and thereby locks the position of the screw head 3 which lock cannot be released in normal operation due to the self-locking action.

After the position of the seat part 5 relative to the rod 15 as obtained by precise adjustment has been determined the swivel nut is again tightened. Thereupon, the locking member 45 is screwed in between the legs 11, 12 in direction towards the rod for locking the swivel nut.

Preferably, the above-described cone angle is in a range between 2 and 10. Particular preferred is a range of between 2 and 5 for this angle.

Claims (12)

1. Anchoring member with a bone screw comprising a screw member (1) having a threaded portion ( 2) and a head (3) with a spheri-cal segment shaped portion, and a seat part (5) for receiving the head (3) of the screw member and a rod (15) to be connected to the anchoring member, the seat part (5) having a first end (6) and an opposite second end (7), an axis of symmetry (8) pas-sing through the first and second end, a bore (9) arranged coaxially with the axis of symmetry for passing the threaded portion ( 2) therethrough and a first region adjacent to the first end (6) having a substantially U-shaped cross-section with two free legs (11, 12) with an internal screw thread (13) for receiving the rod (15) to be inserted therein, characterized in that the bore (9) has a cone angle in a second region (16) adjacent to the second end tapering towards the se-cond end (7), and that a pressure member (20) embracing the side of the screw head (3) opposite to the threaded portion (2), the outer surface of the pressure member being formed to a conically tapered towards the second end (7) at a portion (27) laterally surrounding the srew head (3), the cone angle of the pressure member corresponding to that of the second portion (16).
2. Anchoring member according to claim 1, characterized in that the cone angle is in a range from about 2° to approximately 10°.
3. Anchoring member according to claim 1 or 2, characterized in that the cone angle is about 4°.
4. Anchoring member according to any of the claims 1 to 3, cha-racterized in that the pressure member (20) has a first face (21) and an opposite second face (22) and a substantially cy-clindrical first portion (23) adjacent to the first face (21), the first portion having an outer diameter is selected to allow sliding movement of the pressure member within the bore (9), the pressure member having a second portion (24) adjacent to the first portion (23), the second portion being formed as a trancated cone having an outer surface which conically tapers towards the second face (22).
5. Anchoring member according to claim 4, characterized in that the pressure member (20) has a recess (25) for receiving the screw head (3) at the second portion (24) of the pressure mem-ber, the recess being shaped as a spherical segment and open to-wards the second face.
6. Anchoring member according to claim 5, characterized in that the pressure member (20) have a bore for passing a screwing tool therethrough into engagement with the screw head (3), the bore being coaxial with the cylinder axis of the first portion (23) and joining the spherical segment shaped recess (25).
7. Anchoring member according to any of the claims 1 to 6, cha-racterized in that the pressure member (20) has a recess (27) on its side away from the screw head (3), the recess being formed as a cylinder portion having a cylinder axis perpendicular to the axis of symmetry (8) and a radius of curvature corresponding to the radius of curvature of the base of the U-shaped recess (10) defined by the two legs (11, 12) of the seat part.
8. Anchoring member according to any of the claims 5 to 7, cha-racterized in that the pressure member (20) has a plurality of longitudinal slits (28) which are open towards the second face (22) and have a longitudinal axis parallel to the cylinder axis of the first portion (23).
9. Anchoring member according to claim 8, characterized in that there are two opposing longitudinal slots (28) with their longi-tudinal axes being in a plane which passes through the cylinder axis of the first cylindrical portion (23) and extends perpendi-cular to the cylinder axis of the recess (27), the longitudinal slits extending closely to the first face (21) of the pressure member.
10. Anchoring member according to any of the claims 1 to 9, cha-racterized in that the pressure member (20) with the screw head (3) placed therein is secured against rotation within the seat part (5) by crimping.
11. Anchoring member according to any of the claims 5 to 10, characterized in that the depth of the recess (25) in axial di-rection is greater than the radius of the recess.
12. Anchoring member according to any of the claims 1 to 11, characterized in that a member formed as a swivel nut (40) em-bracing the outside of the two free legs (11, 12) is provided, the internal screw thread of the member cooperating with the ex-ternal screw thread (14) in the region of the legs, and that a locking member (45) is provided for locking the swivel nut (40), the locking member having an external screw thread engaging the internal screw thread (13) of the legs (11, 12).
CA002171068A 1995-03-15 1996-03-05 Anchoring member Expired - Lifetime CA2171068C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509332.1 1995-03-15
DE19509332A DE19509332C1 (en) 1995-03-15 1995-03-15 Anchoring element

Publications (2)

Publication Number Publication Date
CA2171068A1 CA2171068A1 (en) 1996-09-16
CA2171068C true CA2171068C (en) 1999-02-09

Family

ID=7756714

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002171068A Expired - Lifetime CA2171068C (en) 1995-03-15 1996-03-05 Anchoring member

Country Status (8)

Country Link
US (1) US5672176A (en)
EP (1) EP0732081B1 (en)
JP (1) JP3792287B2 (en)
KR (1) KR100399660B1 (en)
AT (1) ATE192308T1 (en)
CA (1) CA2171068C (en)
DE (2) DE19509332C1 (en)
TW (1) TW312737B (en)

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