CA2512494A1 - Medical implant comprising a secured bone screw - Google Patents

Medical implant comprising a secured bone screw Download PDF

Info

Publication number
CA2512494A1
CA2512494A1 CA002512494A CA2512494A CA2512494A1 CA 2512494 A1 CA2512494 A1 CA 2512494A1 CA 002512494 A CA002512494 A CA 002512494A CA 2512494 A CA2512494 A CA 2512494A CA 2512494 A1 CA2512494 A1 CA 2512494A1
Authority
CA
Canada
Prior art keywords
screw
thread
bore
turning
implant
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
CA002512494A
Other languages
French (fr)
Inventor
Arnold Keller
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.)
Cervitech Inc
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
Application filed by Individual filed Critical Individual
Publication of CA2512494A1 publication Critical patent/CA2512494A1/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
    • A61B17/7059—Cortical plates
    • 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
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • 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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • 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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • 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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • 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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue
    • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30576—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs
    • A61F2002/30578—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs having apertures, e.g. for receiving fixation screws

Abstract

The invention relates to a medical implant comprising a secured bone screw (4) that is guided through a borehole (3) of the implant (1, 2). The borehole (3) has a thread that is matched to the thread of the screw. A non-threaded section (10) whose diameter is no greater than the free diameter of the threaded borehole (3) is located between the head (6) and thread (5) of the screw. This thread prevents the screw from axially coming through without turning. Turning is hindered or prevented by a turn-hindering device (15, 16).

Description

Waldemar Link (GmbH & Co.), Hamburg D/mu Medical implant comprising a secured bone screw With medical implants which are to be fastened to bone using a bone screw, it is often necessary to prevent backward migration of the screw from its assigned positon, so that it cannot pose a danger to adjacent organs. It is not enough, as is known in the prior art, to secure the screws against turning in the direction of unscrewing, because, if their thread turns are engaged loosely in the bone substance, there is a danger of their moving back axially without any appreciable turning. It is therefore known to secure the screws by providing the implant with covering arrangements which, after the screw has been screwed in, are placed over the screw head in order to prohibit its backward movement Such covering arrangements, however, take up additional space, which can sometimes be undesirable.
The invention therefore aims to provide a means of securing bone screws without the need to cover the screw head.
The solution according to the invention lies in the features of the claims. Accordingly, the invention provides that the bone screw is guided through a bore of the implant, which bore is provided with a thread matching the thread of the screw, that the screw shank between the screw head and the thread has an unthreaded portion whose length is at least as great as the length of the threaded bores, and that the implant and the screw are provided with means which inhibit reverse turning of the screw. lnlhen the screw is located in its assigned position, the unthreaded portion of the screw shank lies in the threaded bore of the implant. The threads of the bore and of the screw do not engage in one another in this state. The securing of the screw against backward movement is achieved by the fact that the screw thread cannot pass axially through the threaded bore. The mutually adjoining, final turns of the bore thread and of the screw thread form axial abutments which prevent backward movement of the screw.
Escape of the screw from the implant would then only be possible if the screw thread were able to move by turning into the thread of the bore. This, however, is prevented by the barrier against backward turning.
The invention is explained in more detail below with reference to the drawings which depicts an advantageous illustrative embodiment. In the drawings:
Fig. i shows a cross section through an endoprosthesis along line I-I in Figure 2, Fig. 2 shows a ventral view of the prosthesis, Fig. 3 shows a cross section along line III-III in Figure 2, and Fig. 4 shows a cross section through the bone screw used in the arrangement, looking toward the shank-side face of the screw head.
An endoprosthesis is shown, with a plate 1 on the edge of which a. flange 2 is arranged, said flange having two bores 3 which are intended to receive bone screws 4, which in turn are intended to fasten the flange 2 on the surface of a bone. For anchoring in the bone, the bone screws have a thread 5 which, in the portion near the tip of the screw seen on the right in Figure 1, is only indicated by broken lines. At the other end, the shank of the screw 4 is provided with a head 6 which AMENDED SHEET
has surfaces for engagement of a screwing instrument, which surfaces, in tine example shown, are designed as a hexagon socket 7. An unthreaded portion 10 is situated between the shank-side face 8 of the screw head 6 and the adjacent end 9 of the thread 5.
The associated bore 3 can (but does not need to) have a seat 11 for completely or partially receiving the screw head 6, said seat 11 forming a face 12 for supporting the rear face 8 of the screw head 6. The bore portion between the face 12 and the rear face 13 of the flange 2 of the bore comprises a thread 14 which matches the thread 5 of the screw 4. The length of the threaded portion in the bore between the faces 12 and 13 is at most as great as the axial length of the unthreaded portion 10 of the screw and not much shorter. The diameter of the unthreaded portion 10 of the screws is not greater than the free core cross section in the bore 3. Accordingly, after the screw 4 has been fully screwed in, the screw thread 5 is free from the thread 14 of the bore 3. The screw can thus be turned freely, as is necessary in order to draw the flange 2 fully onto the surface of the bone by tightening the screw in the bone.
The rear end 9 of the screw thread 5 and the adjoining end of the thread 14 in the bore 3 form abutments which prohibit an axial, non-rotational backward movement of the screw 4 onto the flange 2 of the implant. To ensure that backward turning is also prevented, the screw and the implant are provided with an arrangement preventing turning. This arrangement can be of any very simple kind known generally in the prior art for preventing backward turning of screws. For example, the screw head can be provided with serrations 15 on its shank-side face in order to interact with corresponding members of the flange 2 and thereby prevent backward turning. In the present example, the members preventing backward turning in Figure 3 are indicated in the form of a spring tongue 16 which protrudes resiliently from the base face 12 of the seat 11 of the flange, so that its AMENDED SHEET
edge can come into engagement with the serrations 15.
The arrangement is configured in such a way that the screw can be turned only in the direction in which it is screwed into the bone. If an attempt is made to turn it in the direction of unscrewing, the end edge of the spring 16 comes into engagement with the teeth 15 and prevents further backward turning.
The thread 14 in the bore 3 does not have to be particularly long. On the contrary, it can be extremely short. There does not even have to be a complete thread turn. It is enough, for example, to provide the suggestion of a thread turn in the form of a projection on one side of the bore, said projection being just large enough to prevent the axial passage of the threaded part of the screw.
The device preventing back~,~~ard turning should be active as soon as the screw 4 is situated with its unthreaded portion 10 in the bore 3. In this state, the screw head 6 must therefore be so close to the flange 2 that the end face of the lamella 16 engages in the serrations 15 of the screw head 6. This is ensured by the thread end 9 abutting against the last thread of the bore thread 14. In other words, the distance of the thread end 9 from the serrations 15 must be smaller than the distance of the rear end of the bore thread 14 from the end face of the spring tongue 26 when the latter is in its relaxed state protruding furthest forward. In this connection, it should be noted that the abutment of the thread ends on one another determines the relative position of the flange and of the screw only with an uncertainty of one thread height. The spring distance of the end face of the spring tongue 16 must therefore be greater than one thread lead. This condition can be made easier if the locking means (serrations and spring tongue) effecting the prevention of backward turning is provided not on the rear end face but on the circumferential face of the screw head or in the transition area between the rear end face and the circumferential face.

Claims

claim Medical implant with a secured bone screw, characterized in that the screw (4) is guided through a bore (3) of the implant (1, 2), which bore (3) has a thread (14) matching the thread (5) of the screw (4), and, between its head (6) and the thread (5), the screw (4) has an unthreaded portion (10) whose diameter is not greater than the free diameter of the threaded bore (3), and in that an arrangement (15, 16) preventing backward turning is provided for the screw (4).
CA002512494A 2003-01-23 2003-05-19 Medical implant comprising a secured bone screw Abandoned CA2512494A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/349,175 2003-01-23
US10/349,175 US7160303B2 (en) 2003-01-23 2003-01-23 Medical implant with a secured bone screw
PCT/EP2003/005256 WO2004064655A1 (en) 2003-01-23 2003-05-19 Medical implant comprising a secured bone screw

Publications (1)

Publication Number Publication Date
CA2512494A1 true CA2512494A1 (en) 2004-08-05

Family

ID=32770252

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002512494A Abandoned CA2512494A1 (en) 2003-01-23 2003-05-19 Medical implant comprising a secured bone screw

Country Status (18)

Country Link
US (1) US7160303B2 (en)
EP (1) EP1585450B1 (en)
JP (1) JP4303686B2 (en)
KR (1) KR20050092776A (en)
CN (1) CN100337601C (en)
AR (1) AR049243A1 (en)
AT (1) ATE414479T1 (en)
AU (1) AU2003238355B2 (en)
BR (1) BR0318034A (en)
CA (1) CA2512494A1 (en)
DE (1) DE50310814D1 (en)
IL (1) IL169453A (en)
MX (1) MXPA05007808A (en)
NZ (1) NZ541244A (en)
PL (1) PL377191A1 (en)
RU (1) RU2307617C2 (en)
WO (1) WO2004064655A1 (en)
ZA (1) ZA200506055B (en)

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US10849667B2 (en) 2013-02-22 2020-12-01 University of Pittsburgh—of the Commonwealth System of Higher Education Biodegradable, magnesium-containing bone screws, methods for their preparation and medical applications therefor
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Also Published As

Publication number Publication date
NZ541244A (en) 2007-08-31
JP4303686B2 (en) 2009-07-29
CN100337601C (en) 2007-09-19
ZA200506055B (en) 2006-05-31
BR0318034A (en) 2005-12-06
MXPA05007808A (en) 2005-10-18
US20050090826A1 (en) 2005-04-28
US7160303B2 (en) 2007-01-09
WO2004064655A1 (en) 2004-08-05
ATE414479T1 (en) 2008-12-15
PL377191A1 (en) 2006-01-23
RU2307617C2 (en) 2007-10-10
AU2003238355A1 (en) 2004-08-13
CN1735382A (en) 2006-02-15
IL169453A (en) 2009-09-01
AR049243A1 (en) 2006-07-12
AU2003238355B2 (en) 2007-11-08
DE50310814D1 (en) 2009-01-02
KR20050092776A (en) 2005-09-22
EP1585450B1 (en) 2008-11-19
RU2005126611A (en) 2006-01-20
JP2006512978A (en) 2006-04-20
EP1585450A1 (en) 2005-10-19

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Legal Events

Date Code Title Description
EEER Examination request
FZDE Discontinued