AU2022200488B2 - Axially pressurizing tooth-shaped anti-drop screw with strong tension - Google Patents
Axially pressurizing tooth-shaped anti-drop screw with strong tension Download PDFInfo
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- AU2022200488B2 AU2022200488B2 AU2022200488A AU2022200488A AU2022200488B2 AU 2022200488 B2 AU2022200488 B2 AU 2022200488B2 AU 2022200488 A AU2022200488 A AU 2022200488A AU 2022200488 A AU2022200488 A AU 2022200488A AU 2022200488 B2 AU2022200488 B2 AU 2022200488B2
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- Prior art keywords
- screw
- pressurizing
- expansion
- expansion tail
- tail end
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Classifications
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- 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
- A61B17/72—Intramedullary pins, nails or other devices
- A61B17/7233—Intramedullary pins, nails or other devices with special means of locking the nail to the bone
- A61B17/7258—Intramedullary pins, nails or other devices with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone
-
- 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
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
-
- 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
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices
- A61B17/921—Impactors or extractors, e.g. for removing intramedullary devices for intramedullary devices
Abstract
Disclosed is an axially pressurizing tooth-shaped anti-drop screw with strong tension,
including an anti-drop screw and an expansion tail plug, where the anti-drop screw includes an
expansion tail end, a polished rod portion, and a tensile head end of the screw; the polished rod
portion is connected with the expansion tail end and the tensile head end of the screw to form a
screw body; the screw body has a penetrating wire guiding hole along an axial direction and a
threaded pressurizing part disposed therein; the expansion tail end is provided with a plurality of
expansion cracks along the axial direction; a maximum diameter of the tensile head end of the
screw is greater than a diameter of the expansion tail end and a diameter of the polished rod
portion; and the expansion tail plug is inserted into the expansion tail end after the expansion tail
end is expanded. The present disclosure can resolve a problem in the prior art that fracture
healing is affected because a fracture line may be opened by a common screw and distal and
proximal odontoid fracture ends may be separated and displaced.
10
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Fig.5
Description
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Fig.5
[0001] The present disclosure relates to the field of medical instruments, and in particular, to
an axially pressurizing tooth-shaped anti-drop screw with strong tension.
[0002] With the rapid development of the real estate industry and the transportation industry,
falls from heights and traffic accidents are frequently seen, and dentate fractures of the axis are
not uncommon, accounting for 10% to 15% of cervical fractures and dislocations in adults.
Anterior odontoid screw fixation can maintain a rotation function of C1-2 to the greatest extent,
and it is reported in the literature that a fusion rate of fractures may reach 88%-100%, but only
type II fractures are suitable for direct anterior screw fixation. In recent years, clinical studies
have found that fracture ends are excessively separated and are displaced after the screw
fixation (as shown in FIG. 1 below), and the screw is loosened and withdrawn. As a result, the
operation fails, bringing in economic and psychological burdens to the patients and families.
[0003] The most important drawback of an odontoid hollow screw currently used in clinical
practice is that when the hollow screw is screwed into an odontoid fracture end, a fracture line
may be opened up and the distal and proximal odontoid fracture ends may be separated and
displaced, which affects fracture healing. In addition, axial pressurizing capability of the screw
!0 is relatively poor.
[0004] Thus there is a need for an axially pressurizing tooth-shaped anti-drop screw with
strong tension which overcomes the above drawbacks or which at least provides the public or
industry with a useful choice.
[0005] It is acknowledged that the terms "comprise", "comprises" and "comprising" may,
under varying jurisdictions, be attributed with either an exclusive or an inclusive meaning. For the purpose of this specification, and unless otherwise noted, these terms are intended to have an inclusive meaning - i.e., they will be taken to mean an inclusion of the listed components which the use directly references, and possibly also of other non-specified components or elements.
[0006] Reference to any document in this specification does not constitute an admission that
it is prior art, validly combinable with other documents or that it forms part of the common
general knowledge.
[0007] The present disclosure proposes an axially pressurizing tooth-shaped anti-drop screw
with strong tension. The present disclosure provides an axially pressurizing odontoid anti-drop
screw with strong tension to address the problem in the prior art that fracture healing is affected
because a fracture line may be opened by a common screw and distal and proximal odontoid
fracture ends may be separated and displaced. Application of this utility has great effects on
improving the surgical efficacy and reducing the complications.
[0008] According to one example embodiment there is provided a axially pressurizing
tooth-shaped anti-drop screw with strong tension, including an anti-drop screw and an
expansion tail plug.
[0009] The anti-drop screw includes an expansion tail end, a polished rod portion, and a
tensile head end of the screw, where the polished rod portion is connected with the expansion
!0 tail end and the tensile head end of the screw to form a screw body, the screw body has a
penetrating wire guiding hole along an axial direction and a threaded pressurizing part disposed
inside the polished rod portion, and the expansion tail end is provided with a plurality of
expansion cracks along the axial direction.
[0010] A maximum diameter of the tensile head end of the screw is greater than a diameter of
the expansion tail end and a diameter of the polished rod portion.
[0011] The expansion tail plug is inserted into the expansion tail end causing the expansion
tail end to expand along the expansion crack.
[0012] In an example embodiment, an internal thread is provided inside the expansion tail end,
and an external thread matching with the internal thread is provided outside the expansion tail
plug.
[0013] In an example embodiment, an external thread is provided outside the expansion tail
end.
[0014] In an example embodiment, the threaded pressurizing part is an internal thread for
connecting a knocking instrument, and the threaded pressurizing part is disposed coaxially with
the wire guiding hole.
[0015] In an example embodiment, the knocking instrument includes a handle part, a sliding
weight, a pressurizing rod, and a connection screw head; the handle part is connected with the
pressurizing rod; the sliding weight is sleeved on the pressurizing rod; and the connection screw
head is disposed at an end portion of the pressurizing rod to be threadedly connected with the
threaded pressurizing part.
[0016] In an example embodiment, the pressurizing rod is provided with a penetrating center
hole along the axial direction.
[0017] In an example embodiment, the expansion tail plug is in a truncated cone structure.
[0018] In an example embodiment, the tensile head end of the screw is in a spindle structure,
and an external thread is provided outside the tensile head end of the screw.
[0019] Through an axially pressurizing tooth-shaped anti-drop screw with strong tension,
existing defects in clinical use of an odontoid screw are completely resolved according to the
present disclosure. Specifically, the axially pressurizing tooth-shaped anti-drop screw with
strong tension is inserted and the expansion tail end is buried into the bone cortex of the axis.
Since the diameter of the tensile head end of the screw is larger than that of the tail end, the
tensile head end of the screw is in a relaxed state after the tail end is buried. Subsequently, the
pressurizing rod is inserted, and the sliding weight of the handle part is mounted. Knocking in a
reverse direction enables the pressurizing part to pressurize, so that the anti-drop screw is
brought closer to a proximal fracture end from a distal fracture end. In this case, the bone cortex
of the axis may be exposed by the expansion tail end, and the bone cortex may be fixed through
the external thread at a surface of the expansion tail end. After the pressurizing rod is withdrawn,
the expansion tail plug is screwed, where the external thread of the expansion tail plug meshes with the internal thread of the expansion tail end. In this way, regarding a type II odontoid fracture, posterior fixation may be reduced and rotational movement of an atlantoaxial joint may be reserved. Powerful axial pressurization enables the screw to be closer to a proximal fracture end from a distal fracture end, thereby increasing a bone fusion rate. Withdrawal of the screw is restricted by a rear expansion tail portion, which has positive effects on reducing esophageal injuries.
[0020] FIG. 1 is a clinical CT image of fracture ends that are excessively separated and are
displaced after screw fixation;
[0021] FIG. 2 is a schematic diagram of an axially pressurizing tooth-shaped anti-drop screw
with strong tension in a use state;
[0022] FIG. 3 is a schematic diagram of an axially pressurizing tooth-shaped anti-drop screw
with strong tension in a use state;
[0023] FIG. 4 is cross-sectional view of FIG. 2; and
[0024] FIG. 5 is cross-sectional view of FIG. 3.
[0025] To more clearly describe the technical solutions in the embodiments of the present
disclosure, the accompanying drawings required in the description of the embodiments are
briefly illustrated below. Apparently, the accompanying drawings in the description below are
!0 only part of the embodiments of the present disclosure, and other accompanying drawings may
also be obtained without creative effort by one of ordinary skills in the art according to these
accompanying drawings.
[0026] To make technical solutions, and advantages of the present disclosure clearer, the
specific implementation of the present disclosure may be further described below with reference
to the accompanying drawings and the embodiments, which is an explanation rather than a
limitation to the present disclosure.
[0027] As shown in FIG. 1 to FIG. 5, the present disclosure provides an axially pressurizing
tooth-shaped anti-drop screw with strong tension, including an anti-drop screw 20 and an
expansion tail plug 30.
[0028] The anti-drop screw 20 includes an expansion tail end 21, a polished rod portion 22,
and a tensile head end 23 of the screw, where the polished rod portion 22 is connected with the
expansion tail end 21 and the tensile head end 23 of the screw to form a screw body, the screw
body has a penetrating wire guiding hole 26 along an axial direction and a threaded pressurizing
part 25 disposed therein, and the expansion tail end 21 is provided with a plurality of expansion
cracks 24 along the axial direction.
[0029] A maximum diameter of the tensile head end 23 of the screw is greater than a diameter
of the expansion tail end 21 and a diameter of the polished rod portion 22.
[0030] The expansion tail plug 30 is inserted into the expansion tail end 21 after the
expansion tail end 21 is expanded.
[0031] A knocking instrument 10 includes a handle part 11, a sliding weight 12, a pressurizing
rod 13, and a connection screw head 15, where the handle part 11 is connected with the
pressurizing rod 13; the sliding weight 12 is sleeved on the pressurizing rod 13; the connection
screw head 15 is disposed at an end portion of the pressurizing rod 13 to be threadedly
connected with the threaded pressurizing part 25; and the pressurizing rod 13 is provided with a
penetrating center hole 14 along the axial direction. The sliding weight 12 is sleeved on the
pressurizing rod 13 through a notch 16.
[0032] An internal thread is provided inside the expansion tail end 21, and an external thread
is provided outside the expansion tail plug 30. An external thread is provided outside the
expansion tail end 21. In this way, fixation is achieved after expansion, so as to prevent
loosening at a later stage.
[0033] The threaded pressurizing part 25 for connecting the knocking instrument 10 is
disposed inside the screw body.
[0034] The expansion tail plug 30 is in a truncated cone structure. The tensile head end 23 of
the screw is in a spindle structure, and an external thread is provided outside the tensile head
end 23 of the screw.
[0035] In use, the operation is performed in the following steps.
[0036] 1. Expose a cervical anterolateral approach.
[0037] 2. After blunt dissection is performed to the anterior longitudinal ligament, perform
dissection along the anterior longitudinal ligament to the lower edge of the cervical vertebra 2,
and insert two anterior cervical retractors into both sides of the cervical vertebra 2 to fully
expose the cervical vertebra 2.
[0038] 3. First, insert a Kirschner wire of a diameter of 1.5 mm as a guide, where a direction
of the guide wire needs to be facing towards the back of an odontoid tip; and subsequently,
insert an axially pressurizing tooth-shaped anti-drop screw with strong tension of a diameter of
3.5 mm or 4 mm along the guide wire, and bury the expansion tail end 21 into the bone cortex
of the axis by 2-3 mm. Since the diameter of the tensile head end of the screw is larger than that
of the tail end, the tensile head end of the screw is in a relaxed state after the tail end is buried.
[0039] 4. Withdraw the guide wire within the screw, insert the pressurizing rod 13, and mount
the sliding weight 12 of the handle part 11. Perform knocking in a reverse direction for
pressurization to allow the screw to be closer to a proximal end from a distal fracture end. In
this case, the bone cortex of the axis may be exposed by the expansion tail end 21, and the bone
cortex may be fixed through the external thread at the surface of the expansion tail end 21.
[0040] 5. Screw the expansion tail plug 30 into the expansion tail end 21 after the pressurizing
rod is withdrawn, where the external thread of the expansion tail plug 30 meshes with the
internal thread of the expansion tail end 21 for fixing.
[0041] Degree of pressurization by the screw depends on degree of separation between the
fracture ends during fluoroscopy, and a separation distance is equal to the distance for which the
screw is buried in the bone cortex. In this case, the expansion tail end 21 does not remain too
long outside the bone cortex, without affecting the swallowing function of the patient.
[0042] In view of the above, through an axially pressurizing tooth-shaped anti-drop screw
with strong tension, existing defects in clinical use of an odontoid screw are completely
resolved according to the present disclosure. Regarding a type II odontoid fracture, posterior
fixation may be reduced and rotational movement of an atlantoaxial joint may be reserved.
Powerful axial pressurization enables the distal fracture end closer to the proximal end, thereby increasing a bone fusion rate. Withdrawal of the screw is restricted by a rear expansion tail portion, which has positive effects on reducing esophageal injuries.
[0043] The foregoing embodiments merely describe the implementation of the present
disclosure, so that a person skilled in the art can implement or use the present disclosure. The
description is not for limitation. Therefore, the present disclosure would not be limited to the
embodiments described herein, and all additions and equivalent replacements made according to
the technical features of the present disclosure fall within the scope of the protection of this
application.
10 Knocking Instrument
11 Handle Part
12 Sliding Weight
13 Pressurizing Rod
14 Center Hole
15 Connection Screw Head
16 Notch
20 Anti-Drop Screw
21 Expansion Tail End
22 Polished Rod Portion
!0 23 Tensile Head End of The Screw
24 Expansion Crack
25 Threaded Pressurizing Part
26 Wire Guiding Hole
30 Expansion Tail Plug
Claims (8)
1. An axially pressurizing tooth-shaped anti-drop screw with strong tension, comprising an
anti-drop screw and an expansion tail plug, wherein
the anti-drop screw comprises an expansion tail end, a polished rod portion, and a tensile
head end of the screw, wherein the polished rod portion is connected with the expansion tail end
and the tensile head end of the screw to form a screw body, the screw body has a penetrating
wire guiding hole along an axial direction and a threaded pressurizing part disposed inside the
polished rod portion, and the expansion tail end is provided with a plurality of expansion cracks
along the axial direction;
a maximum diameter of the tensile head end of the screw is greater than a diameter of the
expansion tail end and a diameter of the polished rod portion; and
the expansion tail plug is inserted into the expansion tail end causing the expansion tail end
to expand along the expansion cracks.
2. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
claim 1, wherein an internal thread is provided inside the expansion tail end, and an external
thread matching with the internal thread is provided outside the expansion tail plug.
3. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
claim 1, wherein an external thread is provided outside the expansion tail end.
4. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
any one of claims 1 to 3, wherein the threaded pressurizing part is an internal thread for
connecting a knocking instrument, and the threaded pressurizing part is disposed coaxially with
the wire guiding hole.
5. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
claim 4, wherein the knocking instrument comprises a handle part, a sliding weight, a
pressurizing rod, and a connection screw head; the handle part is connected with the pressurizing
rod; the sliding weight is sleeved on the pressurizing rod; and the connection screw head is
disposed at an end portion of the pressurizing rod to be threadedly connected with the threaded
pressurizing part.
6. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
claim 5, wherein the pressurizing rod is provided with a penetrating center hole along the axial
direction.
7. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
any one of claims 1 to 6, wherein the expansion tail plug is in a truncated cone structure.
8. The axially pressurizing tooth-shaped anti-drop screw with strong tension according to
any one of claims 1 to 7, wherein the tensile head end of the screw is in a spindle structure, and
an external thread is provided outside the tensile head end of the screw.
1 / 2 27 Jan 2022 2022200488
（a） （b）
Fig.1
Fig.2
Fig.3
2 / 2
Fig.5 Fig.4
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110190688.4A CN112807067A (en) | 2021-02-19 | 2021-02-19 | Axial pressurization strong-tension tooth-shaped anti-drop screw |
| CN202110190688.4 | 2021-02-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2022200488A1 AU2022200488A1 (en) | 2022-09-08 |
| AU2022200488B2 true AU2022200488B2 (en) | 2023-05-18 |
Family
ID=75864201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2022200488A Active AU2022200488B2 (en) | 2021-02-19 | 2022-01-27 | Axially pressurizing tooth-shaped anti-drop screw with strong tension |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112807067A (en) |
| AU (1) | AU2022200488B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6162234A (en) * | 1993-03-23 | 2000-12-19 | Freedland; Yosef | Adjustable button cinch anchor orthopedic fastener |
| WO2008112912A2 (en) * | 2007-03-13 | 2008-09-18 | Smith & Nephew, Inc. | Internal fixation devices |
| US10064670B2 (en) * | 2014-05-12 | 2018-09-04 | DePuy Synthes Products, Inc. | Sacral fixation system |
| US10363074B2 (en) * | 2012-11-12 | 2019-07-30 | Navid Ziran | Dynamic axial nail for intramedullary treatment of long bone fractures |
-
2021
- 2021-02-19 CN CN202110190688.4A patent/CN112807067A/en active Pending
-
2022
- 2022-01-27 AU AU2022200488A patent/AU2022200488B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6162234A (en) * | 1993-03-23 | 2000-12-19 | Freedland; Yosef | Adjustable button cinch anchor orthopedic fastener |
| WO2008112912A2 (en) * | 2007-03-13 | 2008-09-18 | Smith & Nephew, Inc. | Internal fixation devices |
| US10363074B2 (en) * | 2012-11-12 | 2019-07-30 | Navid Ziran | Dynamic axial nail for intramedullary treatment of long bone fractures |
| US10064670B2 (en) * | 2014-05-12 | 2018-09-04 | DePuy Synthes Products, Inc. | Sacral fixation system |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2022200488A1 (en) | 2022-09-08 |
| CN112807067A (en) | 2021-05-18 |
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