CN106037908A - Universal pedicle screw capable of realizing single-axis fixation - Google Patents

Universal pedicle screw capable of realizing single-axis fixation Download PDF

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Publication number
CN106037908A
CN106037908A CN201610317726.7A CN201610317726A CN106037908A CN 106037908 A CN106037908 A CN 106037908A CN 201610317726 A CN201610317726 A CN 201610317726A CN 106037908 A CN106037908 A CN 106037908A
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CN
China
Prior art keywords
snib
nail
screw
head
ailhead
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.)
Pending
Application number
CN201610317726.7A
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Chinese (zh)
Inventor
张衣北
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201610317726.7A priority Critical patent/CN106037908A/en
Publication of CN106037908A publication Critical patent/CN106037908A/en
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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
    • A61B17/70—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
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • 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
    • A61B17/7043—Screws or hooks combined with longitudinal elements which do not contact vertebrae with a longitudinal element fixed to one or more transverse elements which connect multiple screws or hooks

Abstract

The invention provides a universal pedicle screw capable of realizing single-axis fixation, and relates to a brand-new universal pedicle screw capable of realizing single-axis fixation for realizing fixation and orthopaedic operation through pedicle screw placement during a posterior spinal fixation surgery. The universal pedicle screw is provided with a screw cap, a screw cap and clamp bolt connecting device, a clamp bolt, a spherical screw head and a screw body, wherein a U-shaped groove is formed in the upper part of the screw cap; a main body of the inner wall of each of two sides of the U-shaped groove is in a cylindrical shape; the inner wall of the U-shaped groove is provided with internal screw threads; one end of the screw cap and clamp bolt connecting device is fixed at a niche arranged at the inner walls of the two sides of the U-shaped groove formed in the screw cap; the other end of the screw cap and clamp bolt connecting device is fixed on the upper surface of the clamp bolt; the natural length of the screw cap and clamp bolt connecting device is shorter than the distance from the clamp bolt to the niche arranged at the inner walls of the two sides of the U-shaped groove formed in the screw cap; the upper surface of the clamp bolt is in an arc shape; the lower surface of the clamp bolt is a spherical concave surface and is anastomotic with the spherical screw head; the screw body is in a reducing cone shape; the surface of the screw body is provided with screw threads gradually deepened form the near end of the screw body to the far end of the screw body; and the clamp bolt and the spherical screw head are in longitudinal and transverse staggered connection through conical bulges.

Description

Can the fixing Universal pedicle screw of single shaft
Technical field
The present invention relates to a kind of being put when Via Posterior Spinal Approach fixes operation by pedicle of vertebral arch follow closely for fixing and orthopedic brand-new Can the fixing Universal pedicle screw of single shaft, especially relate to a kind of can the fixing Universal pedicle screw of single shaft.
Background technology
Posterior spinal operation is conventional modus operandi, when involving the need for fixing or being orthopedic, and nail rod internal fixation system It is requisite.This nail-stick system is generally made up of pedicle screw and securing member thereof and pitman, current pedicle of vertebral arch screw Nail can be basically divided into two kinds, i.e. single shaft fixes pedicle screw and multiaxis Universal pedicle screw.Use single shaft pedicle of vertebral arch screw Nail technology of putting when nail is fixing requires the highest, if the U-lags of 2 nails are not parallel, then pitman and U-lag are contacted from face and become Point cantact, forms stress and concentrates, easy broken nail or disconnected rod；During to carry out more than 2 vertebral bodys fixing, often because of side vertebral arch After root screw placement, head of a nail direction is fixed, and head of a nail U-lag does not makes placement pitman seem the most difficult at same straight line, also face Face the risk that stress is concentrated, and strength by U-lag and in alignment after the screw loosening that easily causes not on straight line or disconnected Split.The most not only make operation technique difficulty, and occur that the probability of internal fixation system untoward reaction increases.Universal pedicle screw gram Take above drawback, owing to the three-dimensional rotation of certain angle can be made between its universal feature, i.e. rivet nut and head of a nail U-lag, made nail-rod Associating the easiest.But, as the big grade of white seal (white seal is big. the research of Universal pedicle screw biomechanical property is entered Exhibition. Jilin medical science, 2006,27 (11): 1301～1302) institute in the progress of Universal pedicle screw biomechanical property Stating, the locking mechanism of the Universal pedicle screw currently used is that the mechanical pressurization by snib realizes, between snib and ailhead Contact surface is smooth, therefore cannot realize parallel strutting and compress, let alone rotation-removing orthopedic as single shaft pedicle screw , therefore can only be used for fixing spinal column.Nonetheless, this it is fixed under long stress effect, between the head of a nail and rivet nut Fine motion can occur, even rupture, it will (Zhang Jidong etc., pedicle screw Ineffective internal fixation loosens, breaks the effect that impact is fixed Split case study and countermeasures.Shanghai medical science, 2007,30 (9): 718～719.).
Summary of the invention
It is an object of the invention to provide a kind of good stability, operation technique can be simplified, shorten operating time, raising operation Curative effect, improve fixed effect can the fixing Universal pedicle screw of single shaft.
The present invention is provided with the head of a nail, the head of a nail and snib attachment means, snib, spherical ailhead, rivet nut；
The top of the described head of a nail is U-lag, and U-lag both sides inwall main body is cylindrical, and U-lag inwall sets female thread；Institute The alcove of head of a nail U-lag both sides inwall, the head of a nail and snib attachment means are fixed in the one end stating the head of a nail and snib attachment means The other end is fixed on the upper surface of snib, and the natural length of the head of a nail and snib attachment means is shorter than the U-lag two of snib and the head of a nail The distance of limit inwall alcove；The upper surface of described snib is curved, the lower surface of snib be spherical concave surface and with spherical ailhead phase It coincide；Described rivet nut is reducing taper, and rivet nut surface sets gradually deepens to rivet nut far-end (tail end) from rivet nut near-end (upper end) Screw thread；The crisscross connection of snib and spherical ailhead conoid protuberance each other.
The described head of a nail and snib attachment means can use the elastic spring of band memory characteristic.
The upper surface center of described spherical ailhead sets inner hexagonal hole, uses when being used for into nail and move back nail.
The surface of the spherical concave surface of described snib can carry tiny cone-shaped bulge, tight with spherical ailhead for spherical concave surface Fixing.
In order to meet present invention three-dimensional activity in certain range of degrees, head of a nail U-lag and rivet nut are separate, pass through Ball-and-socket between ailhead with the head of a nail is connected, it is possible to achieve the three-dimensional activity of rivet nut.
Fixing to realize single shaft, ailhead is fixed by the mechanical pressurization of snib, can limit the activity of rivet nut, and ailhead There is conoid protuberance in the face contacted with snib, can mutually interlock fixing by canine tooth, and fixing intensity is the biggest, it is possible to achieve single shaft is solid Fixed.
In order to keep the normal activity of ailhead, when not pressurizeing fixing, snib separates with ailhead, passes through between them Snib is separated by the elastic connecting device above snib with ailhead, and elastic connecting device one end is connected to card and fixes, and the other end is even It is connected on the head of a nail.When needs pressurization is fixing, elastic connecting device is elongated, and snib declines and ailhead compact siro spinning technology.
In order to increase the holding dynamics of screw, rivet nut is designed to taper, and corresponding screw thread is proximally gradually deepened to far-end.
When pitman (the fixing connection between screw) and time head of a nail nut is not tightened, the bullet between snib and the head of a nail Property attachment means make snib separate with ailhead, rivet nut can rotate with being intended in the head of a nail in permissible range.When pitman and the head of a nail During nut screwing clamping, the snib of band conoid protuberance declines the ailhead protruding with band taper and is coupled, and the conoid protuberance intercoupled is indulged Traversed by is wrong, in conjunction with closely, makes the head of a nail and rivet nut be linked to be an entirety, forms single shaft and fix screw.
The invention provides a kind of pedicle screw used when Via Posterior Spinal Approach fixes operation, both can work as universal spiral shell Nail use, can work as again single shaft and fix screw use, reduce the difficulty putting Pinning, simplify operating procedure, shorten operating time, carry High fixed effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the enlarged diagram of part 6 in Fig. 1.
Detailed description of the invention
See Fig. 1 and 2, the embodiment of the present invention be provided with the head of a nail 1, the head of a nail and snib attachment means 2, snib 3, spherical ailhead 4, Rivet nut 5；The top of the described head of a nail 1 is U-lag, and U-lag both sides inwall main body is cylindrical, and U-lag inwall sets female thread；Described The alcove of head of a nail 1U shape groove both sides inwall, the head of a nail and snib attachment means 2 are fixed in one end of the head of a nail and snib attachment means 2 The other end is fixed on the upper surface of snib 3, and the natural length of the head of a nail and snib attachment means 2 is shorter than the U-shaped of snib 3 and the head of a nail 1 The distance of groove both sides inwall alcove；The upper surface of described snib 3 is curved, and the lower surface of snib 3 is spherical concave surface with spherical Ailhead 4 matches；Described rivet nut 5 in reducing taper, rivet nut 5 surface set from rivet nut near-end (upper end) to rivet nut far-end (tail end) by The screw thread gradually deepened；The crisscross connection of snib 3 and spherical ailhead 4 conoid protuberance each other.
The described head of a nail and snib attachment means 2 can use the elastic spring of band memory characteristic.
The upper surface center of described spherical ailhead 4 sets inner hexagonal hole, uses when being used for into nail and move back nail.
The surface of the spherical concave surface of described snib 3 can carry tiny cone-shaped bulge, tight with spherical ailhead for spherical concave surface Close fixing.
The described head of a nail and snib attachment means 2 are the reed structure with super-elastic of band memory characteristic, and one end is fixed In the alcove of head of a nail U-lag both sides inwall, the other end is fixed on the upper surface of snib, and its natural length is smaller than snib and U The distance of shape cell wall tabernacle, so snib is suspended in midair by elastic connecting device under naturalness, it is to avoid snib contacts with ailhead, Snib is avoided to hinder the activity of ailhead.
Described snib 3 upper surface is the U-shaped end of U-lag, curved, (makes for supporting with screw with cylindric pitman With) radian is quite and supporting.Snib diameter is more slightly larger than the diameter of U-lag, is difficult to exit in may be stuck in the head of a nail, top surface edge with The head of a nail is connected with snib attachment means, and lower surface is spherical concave surface, matches with spherical ailhead, and spherical concave surface is tiny circle Taper is protruding, acts the effect of being tightly fastened.
Described ailhead 4 is spherical mortar body, and surface is tiny cone-shaped bulge, tiny coniform convex with the spherical concave surface of snib Rise and match, can be at arbitrarily angled compact siro spinning technology.Ailhead upper surface center is inner hexagonal hole, uses when being used for into nail and move back nail.
Described rivet nut 5 is variable-diameter structure, from ailhead to nail tail be cone structure, tapering be 3 to 5 degree about, follow closely accordingly Body screw thread the most from the superficial to the deep, can increase hold and the resistance to fracture of screw.
The assemble flow of the present invention is as follows:
First rivet nut passes the through hole of the head of a nail, and rivet nut bulb matches with head of a nail sphere；Snib is pressed into head of a nail U-shaped again In groove, load onto elastic connecting device.The rivet nut assembled can not be deviate from from the head of a nail, is also Universal active between rivet nut and the head of a nail 's.During use, adjust position and the direction of the head of a nail, in U-lag, place pitman, be tightened down connection by clamp nut Rod, pitman can be oppressed snib and coincide downwards ailhead, is cross-linked by the conoid protuberance canine tooth between snib and ailhead and (see figure 2), it is achieved ailhead and the locking of the head of a nail, this locking moment is very big, fixes screw close to single shaft, can easily realize spiral shell Pressurization between nail, strut and go to rotate, be applied not only to fix, it is also possible to very easily for orthopedic.
Material therefor of the present invention is the medical titanium alloy material best with the tissue compatibility.
Between ailhead of the present invention and snib, contact surface is conoid protuberance, and this conoid protuberance can be the most crisscross Compact siro spinning technology, the most firm so that rivet nut and the head of a nail are coupled into an entirety, become single shaft and fix screw.Universal vertebral arch The ailhead of root screw is the surface of conoid protuberance, by the canine tooth interlacing contact between snib conoid protuberance, increase ailhead with The contact surface of snib, thus increase the ability of the anti-rotation between the head of a nail and rivet nut and bending, formed and be similar to uni-axial screws.With The surface that snib contact surface is conoid protuberance that ailhead connects, by the canine tooth interlacing contact between ailhead conoid protuberance, increases Add the contact surface of snib and ailhead, thus increase the ability of the anti-rotation between the head of a nail and rivet nut and bending, formed and be similar to list Axle screw.An elasticity is had to be connected between snib with the head of a nail, when not inserting pitman and tightening pressurizing nut, elastic connection Snib can be kept to separate with ailhead, it is to avoid the fixing of ailhead occur because conoid protuberance contacts in snib and ailhead.When needs are put When entering pitman and tighten pressurizing nut, elastic Joint failure, snib and ailhead compact siro spinning technology, form single shaft and fix.Rivet nut is Long cone shape structure, rivet nut screw thread is gradually deepened from head end to tail end, increases hold and the resistance to fracture of rivet nut.The head of a nail is low Incisura U-lag structure, inwall is provided with female thread, and main body is column structure, and all structures are titanium alloy material.

Claims (6)

1. can the fixing Universal pedicle screw of single shaft, it is characterised in that be provided with the head of a nail, the head of a nail and snib attachment means, snib, Spherical ailhead, rivet nut；
The top of the described head of a nail is U-lag, and U-lag both sides inwall main body is cylindrical, and U-lag inwall sets female thread；Described nail Another of the alcove of head of a nail U-lag both sides inwall, the head of a nail and snib attachment means is fixed in one end of cap and snib attachment means End is fixed on the upper surface of snib, and the head of a nail is shorter than in the snib U-lag both sides with the head of a nail with the natural length of snib attachment means The distance of wall alcove；The upper surface of described snib is curved, and the lower surface of snib is spherical concave surface and matches with spherical ailhead； Described rivet nut is reducing taper, and rivet nut surface sets the screw thread gradually deepened from rivet nut near-end to rivet nut far-end；Snib and spherical nail The crisscross connection of head conoid protuberance each other.
The most as claimed in claim 1 can the fixing Universal pedicle screw of single shaft, it is characterised in that the described head of a nail is connected with snib Device uses the elastic spring of band memory characteristic.
The most as claimed in claim 1 can the fixing Universal pedicle screw of single shaft, it is characterised in that the upper table of described spherical ailhead Center, face sets inner hexagonal hole, uses when being used for into nail and move back nail.
The most as claimed in claim 1 can the fixing Universal pedicle screw of single shaft, it is characterised in that the spherical concave surface of described snib The tiny cone-shaped bulge of surface band, be tightly fastened with spherical ailhead for spherical concave surface.
The most as claimed in claim 1 can the fixing Universal pedicle screw of single shaft, it is characterised in that between described ailhead and the head of a nail Ball-and-socket connects, for realizing the three-dimensional activity of rivet nut.
The most as claimed in claim 1 can the fixing Universal pedicle screw of single shaft, it is characterised in that described ailhead is by snib Mechanical pressurization is fixed, and for limiting the activity of rivet nut, and there is conoid protuberance in the face that ailhead contacts with snib, for ailhead and snib Mutually canine tooth is staggered fixing, it is achieved single shaft is fixed.
CN201610317726.7A 2016-05-13 2016-05-13 Universal pedicle screw capable of realizing single-axis fixation Pending CN106037908A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610317726.7A CN106037908A (en) 2016-05-13 2016-05-13 Universal pedicle screw capable of realizing single-axis fixation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610317726.7A CN106037908A (en) 2016-05-13 2016-05-13 Universal pedicle screw capable of realizing single-axis fixation

Publications (1)

Publication Number Publication Date
CN106037908A true CN106037908A (en) 2016-10-26

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1241127A (en) * 1996-12-20 2000-01-12 托马斯·T·海德尔 Pedicle screw system for osteosynthesis
US20110040336A1 (en) * 2009-08-13 2011-02-17 Hammill Sr John E Thread-thru polyaxial pedicle screw system
CN102949229A (en) * 2011-08-23 2013-03-06 常州市康辉医疗器械有限公司 One-way automatic stretching pedicle screw and application thereof
CN105534584A (en) * 2015-12-31 2016-05-04 曾析非 Micro dynamic pedicle screw
CN205831897U (en) * 2016-05-13 2016-12-28 张衣北 A kind of can the fixing Universal pedicle screw of single shaft

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1241127A (en) * 1996-12-20 2000-01-12 托马斯·T·海德尔 Pedicle screw system for osteosynthesis
US20110040336A1 (en) * 2009-08-13 2011-02-17 Hammill Sr John E Thread-thru polyaxial pedicle screw system
CN102949229A (en) * 2011-08-23 2013-03-06 常州市康辉医疗器械有限公司 One-way automatic stretching pedicle screw and application thereof
CN105534584A (en) * 2015-12-31 2016-05-04 曾析非 Micro dynamic pedicle screw
CN205831897U (en) * 2016-05-13 2016-12-28 张衣北 A kind of can the fixing Universal pedicle screw of single shaft

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Application publication date: 20161026