AU2016355008B2 - Dual-thread bone screw - Google Patents
Dual-thread bone screw Download PDFInfo
- Publication number
- AU2016355008B2 AU2016355008B2 AU2016355008A AU2016355008A AU2016355008B2 AU 2016355008 B2 AU2016355008 B2 AU 2016355008B2 AU 2016355008 A AU2016355008 A AU 2016355008A AU 2016355008 A AU2016355008 A AU 2016355008A AU 2016355008 B2 AU2016355008 B2 AU 2016355008B2
- Authority
- AU
- Australia
- Prior art keywords
- anchoring
- cylindrical
- bone screw
- profile
- threads
- 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.)
- Active
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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
- A61B17/84—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
- 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
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
Abstract
The invention relates to a non-continuous dual-thread bone screw (1) comprising a drive head (2) extended by an anchoring body (3) consisting of a conical-cylindrical core (4) on which at least two conical-cylindrical threads (5, 6) extend that anchor said screw (1) into bone, the anchoring body (3) including over the entire length thereof and from the drive head (2) anchoring portions of different profiles that provide anchoring corresponding to the different hardness and strength levels of the bone, said anchoring body (3) comprising below the drive head (2) a first anchoring portion (7) consisting of a conical core (4a) and two threads (5, 6) of cylindrical profile and identical pitch, a second anchoring portion (8) made up of a cylindrical core (4b) and a single cylindrical thread (5) along one-quarter turn, a third anchoring portion (9) having a cylindrical core (4b) and two threads (5, 6) of cylindrical profile along one-half turn, a fourth anchoring portion (10) including a cylindrical core (4b) and a single thread (6) of cylindrical profile along n turns depending on the overall length of the bone screw (1), a fifth anchoring portion (11) comprising a conical core (4a) and two threads (5, 6) of conical profile that form the tip of the bone screw.
Description
The present invention relates to a double-threaded bone screw which is intended to be
screwed into the bone to ensure, for example, the attachment of prostheses or of an implant.
From the teaching described in the patents US 3 703 843 and US 3 861269, a fastening
screw is known for attaching together parts consisting of different materials with different
strengths.
The fastening screw comprises a drive head from which extends a cylindrical body
provided with two cylindrical threads of identical pitch. Over 1/3 of its length, the cylindrical
body comprises two cylindrical threads arranged either at its pointed free end (US 3 703 843) or
immediately below the drive head (US 3 861269).
From the teaching described in the patent EP 1991145, a bone screw is also known which
includes a threaded body with cylindro-conical profile, provided at one of its ends with a drive
head or with a connector for attaching a linking rod of an osteosynthesis device.
The cylindro-conical body comprises, below its drive head or below the connector, a first
threaded section including two helical threads of identical pitch extended by a second threaded
section consisting of a single helical thread originating from the first threaded section.
In the case of a bone screw, one notes that the bone tissue into which said screw is
implanted exhibits different strengths between its central portion consisting of spongy bone and
its peripheral portion consisting of cortical bone.
Indeed, the bone tissue consists of a hard and dense component, the cortical bone,
covering a trabecular component, and the less dense and less hard spongy bone. These two components form a continuum with a density gradient that increases as it comes closer to the cortical bone.
For this purpose, the discontinuously double-threaded bone screw according to the
present invention aims to improve bone hold and includes along its anchoring body
discontinuous threaded portions ensuring over the entire length of said anchoring body the
attachment of said screw in the different components of the bone tissue.
The good mechanical hold of the bone screw according to the present invention in the
bone tissue is ensured, on the one hand, by the engagement of the thread in the cortical bone and
in the spongy bone, and, on the other hand, by an encapsulation of cortical bone and of spongy
bone around the screw and more particularly between the thread turns in order to perfectly fit the
profile of said screw.
The discontinuously double-threaded bone screw for the attachment of a prosthesis or of
an implant against a bone portion according to the present invention comprises a drive head
extended by an anchoring body consisting of a cylindro-conical core over which extend at least
two cylindro-conical threads ensuring the bone anchoring of said screw, the anchoring body
including, over its entire length and starting from the drive head, anchoring portions of different
profile ensuring an anchoring corresponding to the different hardnesses and strengths of the bone,
said anchoring body including below the drive head a first anchoring portion consisting of a
conical core and two threads with cylindrical profile of identical pitch, a second anchoring
portion consisting of a cylindrical core and of a single cylindrical thread over 1/4 turn, a third
anchoring portion provided with a cylindrical core and with two threads with cylindrical profile
over 1/2 turn, a fourth anchoring portion including a cylindrical core and a single thread with
cylindrical profile over n turns as a function of the total length of the bone screw, and a fifth anchoring portion comprising a conical core and two threads with cylindrical profile forming the tip of the bone screw.
The discontinuously double-threaded bone screw according to the present invention
comprises a first anchoring portion including two threads with cylindrical profile of identical
pitch offset on the periphery of the conical core by 180 degrees.
The discontinuously double-threaded bone screw according to the present invention
comprises a fourth anchoring portion including a cylindrical thread that is different from the
cylindrical thread provided for the second portion.
The discontinuously double-threaded bone screw according to the present invention
comprises an internal bore.
The discontinuously double-threaded bone screw according to the present invention
comprises a drive head which consists of a head with spherical profile having in its internal
portion a recess for the placement of a tool.
The discontinuously double-threaded bone screw according to the present invention
comprises a drive head that consists of a single-piece head with a U-shaped profile intended to
receive a tightening screw for the immobilization.
The discontinuously double-threaded bone screw according to the present invention
comprises a fifth anchoring portion with a conical profile including self-tapping threads.
The following description in reference to the appended drawings, which are given as non
limiting examples, will make it possible to better understand the invention, the features that it has,
and the advantages that it is capable of procuring:
Figure 1 is a perspective view illustrating the discontinuously double-threaded bone
screw according to the present invention.
Figure 2 and 3 are front and cross-sectional views representing the discontinuously
double-threaded bone screw according to the present invention.
Figures 4 and 5 are front and cross-sectional views showing an embodiment variant of the
drive head of a discontinuously double-threaded bone screw according to the present invention
In Figures 1 to 3, a bone screw 1 with discontinuous double thread 5, 6, ensuring, for
example, the attachment of a prosthesis or of an implant against a bone portion, is shown.
The bone screw 1 comprises a drive head 2 extended by an anchoring body 3 consisting
of a cylindro-conical core 4, over which extend at least two discontinuous cylindro-conical
threads 5, 6 ensuring the anchoring of said screw 1 in the different components of the bone tissue.
In this first illustration, the drive head 2 can consist of a head with a spherical profile 2a
having in its internal portion a recess 2b for the placement of a tool for turning the bone screw 1.
The anchoring body 3 includes, over its entire length and starting from the drive head 2,
anchoring portions 7, 8, 9, 10 respectively having different profiles so as to ensure an anchoring
corresponding to the different hardnesses and strengths of the bone tissue.
To this effect, the anchoring body 3 comprises, below the drive head 2, a first anchoring
portion 7 which consists of the core 4 whose profile is conical 4a here, and of two threads 5, 6
with cylindrical profile and of identical pitch.
The two threads 5, 6 with cylindrical profile are offset on the periphery of the conical
core 4a by 1800 degrees. In this first anchoring portion 7, the bone screw 1 has a double-threaded
anchoring body 3 in order to ensure an engagement and holding of the latter in the cortical bone
of the bone tissue.
The anchoring body 3 includes, in the extension of the first anchoring portion 7, a second
anchoring portion 8 consisting of the core 4 whose profile is cylindrical 4b in this area and of a
single cylindrical thread 5 positioned over 1/4 turn of said body.
In this second anchoring portion 8, the second cylindrical thread 6 is stopped so as to
allow only the first cylindrical thread 5 to come in contact with the bone tissue during the
placement of the screw 1.
The anchoring body 3 comprises, in the extension of the second anchoring portion 8, a
third anchoring portion 9 provided with the core 4 whose cylindrical profile 4b is lengthened,
and two threads 5, 6 with cylindrical profile arranged over 1/2 turn of said body.
In this third anchoring portion 9, the second cylindrical thread 6 resumes after stopping in
the preceding anchoring portion, while the first cylindrical thread 5 is maintained continuously
from the first anchoring portion 7.
Thus, at this third anchoring portion 9, the bone screw 1 has a double-threaded anchoring
body 3 over 1/2 turn in order to augment its impression in the bone tissue.
The anchoring body 3 includes, in the extension of the third anchoring portion 9, a fourth
anchoring portion 10 consisting of the core 4 whose profile is cylindrical 4b starting from the
second anchoring portion 8, and a single thread 6 with cylindrical profile which extends over n
turn as a function of the total length of the bone screw 1.
In this fourth anchoring portion 10, the first cylindrical thread 5 is stopped so as to allow
only the second cylindrical thread 6 to come in contact with the bone tissue during the placement
of the screw 1. One notes that the fourth anchoring portion 10 includes a cylindrical thread 6 that
is different from the cylindrical thread 5 provided for the second portion 8.
The anchoring body 3 comprises, in the extension of the fourth anchoring portion 10, a
fifth and last anchoring portion 11 consisting of the core 4 whose profile is again conical 4a and
two threads 5, 6 whose profile is also conical, in order to form with the profile of the core 4 the
tip of the bone screw 1.
In this fifth anchoring portion 11, the bone screw 1 has a double-threaded anchoring body
3 ensuring the penetration of the latter in the cortical bone of the bone tissue.
Moreover, the fifth anchoring portion 11 of the bone screw 1, and more particularly its tip,
comprises recesses 12 that vertically intersect the profile of the two threads 5 and 6.
Each recess 12 positioned on the periphery of the tip of the bone screw 1 constitutes, on
the threads 5 and 6, leading cutting edges 5a and 6a arranged in the direction of rotation and
introduction of said screw in order to make said threads self-tapping.
According to a first variant, the bone screw 1 with discontinuous double thread 5, 6 can
comprise an internal bore 13 enabling it to be guided in the bone tissues by means of a guide,
which is not represented and which is introduced beforehand into said bone tissue.
In Figures 4 and 5, a bone screw 1 is illustrated, which comprises a drive head 2 extended
by an anchoring body 3 consisting of a cylindro-conical core 4 over which extend at least two
discontinuous cylindro-conical threads 5, 6 ensuring the anchoring of said screw 1 in the
different components of the bone tissue.
In this variant, the drive head 2 consists of a single-piece head 2c having a U-shaped
profile firmly attached to the anchoring body 3 having the anchoring portions 7, 8, 9, 10 with
different profiles so as to ensure an anchoring corresponding to the different hardnesses and
strength of the bone tissue.
The single-piece head 2c having a U-shaped profile of which the internal portion of the
vertical branches 2d comprises a threading 2e cooperating with a tightening screw, which is not
represented, for the immobilization of, for example, a linking rod of a spinal osteosynthesis
device.
Moreover, it should be understood that the above description was given only as an
example, and that it in no way limits the scope of the invention, which would not be exceeded by
replacing the execution details described by any other equivalent.
Claims (7)
1. Discontinuously double-threaded bone screw for the attachment of a prosthesis
or of an implant against a bone portion, characterized in that it comprises a drive head
extended by an anchoring body consisting of a cylindro-conical core over which extend
at least two cylindro-conical threads ensuring the bone anchoring of said screw, the
anchoring body including, over its entire length and starting from the drive head,
anchoring portions of different profile, ensuring an anchoring corresponding to the
different hardnesses and strengths of the bone, said anchoring body comprising, below
the drive head, a first anchoring portion consisting of a conical core and two threads
with cylindrical profile of identical pitch, a second anchoring portion consisting of a
cylindrical core and a single cylindrical thread over 1/4 turn, a third anchoring portion
provided with a cylindrical core and two threads with cylindrical profile over 1/2 turn, a
fourth anchoring portion including a cylindrical core and a single thread with
cylindrical profile over n turn as a function of the total length of the bone screw, and a
fifth anchoring portion comprising a conical core and two threads with conical profile
forming the tip of said bone screw.
2. Discontinuously double-threaded bone screw according to Claim 1,
characterized in that the first anchoring portion includes two threads with cylindrical
profile of identical pitch offset on the periphery of the conical core by 180 degrees.
3. Discontinuously double-threaded bone screw according to Claim 1 or Claim 2,
characterized in that the fourth anchoring portion includes a cylindrical thread that is
different from the cylindrical thread provided for the second portion.
4. Discontinuously double-threaded bone screw according to any one of the
preceding Claims, characterized in that it comprises an internal bore.
5. Discontinuously double-threaded bone screw according to any one of the
preceding Claims, characterized in that the drive head consists of a head with spherical
profile having in its internal portion a recess for the placement of a tool.
6. Discontinuously double-threaded bone screw according to any one of Claims 1
to 4, characterized in that the drive head consists of a single-piece head with a U
shaped profile intended to receive a tightening screw for the immobilization of an
osteosynthesis device.
7. Discontinuously double-threaded bone screw according to any one of the preceding Claims1, characterized in that the fifth anchoring portion with conical profile has self-tapping threads.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1560934A FR3043540B1 (en) | 2015-11-16 | 2015-11-16 | DOUBLE THREAD BONE SCREW |
| FR1560934 | 2015-11-16 | ||
| PCT/FR2016/052896 WO2017085376A1 (en) | 2015-11-16 | 2016-11-08 | Dual-thread bone screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2016355008A1 AU2016355008A1 (en) | 2018-06-07 |
| AU2016355008B2 true AU2016355008B2 (en) | 2021-03-11 |
Family
ID=55073007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2016355008A Active AU2016355008B2 (en) | 2015-11-16 | 2016-11-08 | Dual-thread bone screw |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP3376982B1 (en) |
| JP (1) | JP6847107B2 (en) |
| AU (1) | AU2016355008B2 (en) |
| BR (1) | BR112018009570A2 (en) |
| CA (1) | CA3005328A1 (en) |
| ES (1) | ES2759553T3 (en) |
| FR (1) | FR3043540B1 (en) |
| IL (1) | IL259209A (en) |
| MX (1) | MX2018006002A (en) |
| PT (1) | PT3376982T (en) |
| WO (1) | WO2017085376A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230007536A (en) * | 2017-10-09 | 2023-01-12 | 콘메드 코포레이션 | Easy Start Cannulated Bone Screw |
| CN108066041B (en) * | 2018-01-05 | 2024-04-16 | 北京博辉瑞进生物科技有限公司 | Absorbable nail and repair fixer |
| US11000325B2 (en) * | 2018-02-27 | 2021-05-11 | Acumed Llc | Bone fastener with partially overlapping threads and a varying lead |
| CN110123433A (en) * | 2019-05-15 | 2019-08-16 | 山东新华联合骨科器材股份有限公司 | A kind of internal fixing system for anterior cervical vertebrae |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140012334A1 (en) * | 2012-07-03 | 2014-01-09 | Warsaw Orthopedic, Inc. | Mutiple zone bone fastener |
| US20140200620A1 (en) * | 2012-12-13 | 2014-07-17 | Jonathon Yigal Yahav | Implantable fixture |
| DE102014208012B3 (en) * | 2014-04-29 | 2015-08-27 | Silony Medical International AG | osteosynthesis |
| US9179955B2 (en) * | 2014-01-16 | 2015-11-10 | Amendia, Inc. | Orthopedic fastener |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3861269A (en) | 1971-01-04 | 1975-01-21 | Superior Dry Wall Screw Mfg Co | Fastener with improved thread construction |
| US3703843A (en) | 1971-01-04 | 1972-11-28 | Msl Ind Inc | Fastener with improved thread construction |
| US20140121703A1 (en) * | 2012-10-31 | 2014-05-01 | Roger P. Jackson | Polyaxial bone anchor with pop-on multi-thread shank, some with diametric interference fit inserts |
| US8075604B2 (en) | 2006-02-16 | 2011-12-13 | Warsaw Orthopedic, Inc. | Multi-thread bone screw and method |
-
2015
- 2015-11-16 FR FR1560934A patent/FR3043540B1/en active Active
-
2016
- 2016-11-08 PT PT168062651T patent/PT3376982T/en unknown
- 2016-11-08 AU AU2016355008A patent/AU2016355008B2/en active Active
- 2016-11-08 BR BR112018009570-2A patent/BR112018009570A2/en not_active Application Discontinuation
- 2016-11-08 JP JP2018524319A patent/JP6847107B2/en active Active
- 2016-11-08 EP EP16806265.1A patent/EP3376982B1/en active Active
- 2016-11-08 MX MX2018006002A patent/MX2018006002A/en unknown
- 2016-11-08 ES ES16806265T patent/ES2759553T3/en active Active
- 2016-11-08 CA CA3005328A patent/CA3005328A1/en not_active Abandoned
- 2016-11-08 WO PCT/FR2016/052896 patent/WO2017085376A1/en active Application Filing
-
2018
- 2018-05-08 IL IL259209A patent/IL259209A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140012334A1 (en) * | 2012-07-03 | 2014-01-09 | Warsaw Orthopedic, Inc. | Mutiple zone bone fastener |
| US20140200620A1 (en) * | 2012-12-13 | 2014-07-17 | Jonathon Yigal Yahav | Implantable fixture |
| US9179955B2 (en) * | 2014-01-16 | 2015-11-10 | Amendia, Inc. | Orthopedic fastener |
| DE102014208012B3 (en) * | 2014-04-29 | 2015-08-27 | Silony Medical International AG | osteosynthesis |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017085376A1 (en) | 2017-05-26 |
| JP2018535759A (en) | 2018-12-06 |
| EP3376982B1 (en) | 2019-10-16 |
| JP6847107B2 (en) | 2021-03-24 |
| CA3005328A1 (en) | 2017-05-26 |
| IL259209A (en) | 2018-07-31 |
| ES2759553T3 (en) | 2020-05-11 |
| AU2016355008A1 (en) | 2018-06-07 |
| FR3043540A1 (en) | 2017-05-19 |
| PT3376982T (en) | 2019-12-16 |
| EP3376982A1 (en) | 2018-09-26 |
| FR3043540B1 (en) | 2017-12-29 |
| MX2018006002A (en) | 2018-09-17 |
| BR112018009570A2 (en) | 2018-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) |