CN113171166A - Multipurpose pedicle screw, preparation method and fixing method thereof - Google Patents
Multipurpose pedicle screw, preparation method and fixing method thereof Download PDFInfo
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- CN113171166A CN113171166A CN202110454127.0A CN202110454127A CN113171166A CN 113171166 A CN113171166 A CN 113171166A CN 202110454127 A CN202110454127 A CN 202110454127A CN 113171166 A CN113171166 A CN 113171166A
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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
- A61B17/70—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
- A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
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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
- A61B17/70—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
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Abstract
The invention provides a multipurpose pedicle screw, a preparation method and a fixing method thereof, wherein the pedicle screw comprises a ball head screw, the ball head screw is divided into a threaded part and a ball head part along the axial direction, the ball head part is sleeved with a screw seat, the ball head part is provided with a first groove surrounding the ball head part, the screw seat is provided with a second groove surrounding the inner wall, and an annular elastic snap ring is arranged in the second groove; the elastic clamping ring clamps the ball head portion of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, the ball head portion of the ball head screw is moved, the elastic clamping ring is opened, the first groove is matched with the elastic clamping ring, and the ball head screw, the screw seat and the elastic clamping ring are matched and fixed. The universal pedicle screw can rotationally adjust the position and the angle of the ball screw to realize the function of the universal pedicle screw, and after the elastic snap ring is matched with the first groove, the position and the angle of the ball screw are fixed, and the function similar to that of a single-shaft pedicle screw can be realized.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a multipurpose pedicle screw, and a preparation method and a fixing method thereof.
Background
Pedicle screws commonly used at present are mainly uniaxial pedicle screws and universal pedicle screws. Traditional unipolar pedicle of vertebral arch screw fixes in the past, if when going on the fixed of more than 2 centrums, often because of one side pedicle of vertebral arch screw implants the back nut orientation fixed, makes nut U type groove not on same straight line to it is very difficult to place the connective bar. In some cases of osteoporosis, the loosening of the pedicle screws may occur if the screws are placed forcibly. The universal pedicle screw overcomes the defects and has universal rotation characteristics, namely, the screw body and the U-shaped groove of the screw cap can rotate three-dimensionally at a certain angle, so that the combination of the screw and the rod is very easy, and even if the screws implanted into the same side cannot be completely positioned on the same straight line, the direction and the angle of the U-shaped groove of the screw can be adjusted to match the insertion of the rod, thereby reducing the difficulty of bending the rod.
At present, universal pedicle screws are mostly adopted to carry out posterior reduction internal fixation, and the problem of difficult correction of kyphosis caused by thoracolumbar fracture exists. The thoracolumbar fracture is mainly a flexion type injury, regardless of the most common flexion-compression type injury or the most common flexion-tension type injury can cause the injured vertebra and adjacent segments to generate different degrees of posterior convex deformity, and for the traditional posterior pedicle screw reduction, the high recovery of the injured vertebra is mostly realized through a distraction or pressurization mode, but the average orthopedic degree of the posterior operation on the sagittal plane is only 1.8 degrees, the correction capability of the posterior convex deformity of the thoracolumbar fracture and the high maintenance capability after the reduction are limited, and although the distraction reduction is performed, the correction of the posterior convex deformity is not obvious.
CN202982201U discloses a distracting and pressurizing horizontal single-pendulum pedicle screw, which consists of a screw cap, a compression washer and a screw body, wherein the screw body penetrates through the screw cap and is limited and fixed by the compression washer, the screw cap is provided with a U-shaped deep groove, inner threads are arranged on the inner walls of two sides of the deep groove, and grooves which are axially vertical to the screw cap are arranged on the two side walls; wherein, the lower end of the nail cap is provided with a spherical mortar cup, the tail end of the nail cap is provided with a circular runway-shaped hole and a bell mouth, and the long axis direction of the runway-shaped hole is vertical to the central plane of the U-shaped deep groove, so that the horizontal simple pendulum function of the nail cap is realized. The utility model can realize the horizontal plane simple pendulum motion and realize the distraction and pressurization; the mobility between the nail body and the nail cap is determined by the size of the opening of the bell mouth. However, after the pedicle screw is implanted, the horizontal simple-pendulum plane of the pedicle screw cannot be guaranteed to be perpendicular to the compression direction of the fracture, once the pedicle screw is not perpendicular, the compression force is decomposed into 2 forces, the screw body and the screw cap are loosened, and the distraction compression reduction of the fractured vertebral body is inaccurate.
CN104939902A discloses a monoplane pedicle screw, including screw seat, location clamping ring and bulb screw, be equipped with the upside and personally submit circular-arc upwards bellied side platform on the bulb upper portion left and right sides of bulb screw, be equipped with the central boss that the upside personally submits circular-arc upwards bellied on the bulb of bulb screw between two side platforms, the line of the circular arc centre of a circle of central boss and the circular arc centre of a circle of two side platforms is on same straight line, be equipped with the convex concave surface with two side platforms matched with on location clamping ring lower part, the left and right sides of putting excellent groove, be equipped with the convex recess with central boss matched with in the location clamping ring in two convex concave surface middles. In this technique, the screw receptacle and the ball screw likewise pivot in one plane and cannot rotate relative to one another.
CN110960308A discloses a pedicle screw capable of correcting kyphosis deformity, which comprises a screw body, a screw tail and two blades with internal threads; a first U-shaped concave surface is processed at the tail end of the screw tail, and a height difference is formed at two ends of the first U-shaped concave surface to form a first communicating slope; the nut comprises a thread block and a lower pressing block which can be relatively and rotatably connected; the thread block is provided with an external thread matched with the internal thread of the blade, and the thread block can rotate and move in the blade along the thread direction; one end of the lower pressing block is connected with the thread block in a relatively rotating mode, the other end of the lower pressing block faces the screw tail, a second U-shaped concave surface is machined at one end facing the screw tail, and height differences are formed at two ends of the second U-shaped concave surface to form a second continuous slope surface; the inclination direction and the inclination angle of the first consecutive slope surface and the second consecutive slope surface are the same. This technique has followed the design of unipolar pedicle of vertebral arch nail, has the problem of placing the connective bar difficulty.
The problem of the kyphotic deformity that chest lumbar vertebrae fracture leads to all exists to current pedicle screw, consequently, how to guarantee the pedicle screw, possess the function of universal pedicle screw when placing the connective bar for it is simple and convenient to put the stick, when solving the kyphotic deformity that chest lumbar vertebrae fracture leads to simultaneously, can possess the function of unipolar pedicle screw again, becomes the problem that present urgent need solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multipurpose pedicle screw, a preparation method and a fixing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a multipurpose pedicle screw, which comprises a ball head screw, wherein the ball head screw is axially divided into a threaded part and a ball head part, the ball head part is sleeved with a screw seat, the ball head part is provided with a first groove surrounding the ball head part, the screw seat is provided with a second groove surrounding the inner wall, and the second groove is internally provided with an annular elastic snap ring; the elastic clamping ring clamps the ball head portion of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, the ball head portion of the ball head screw is moved, the elastic clamping ring is opened, the first groove is matched with the elastic clamping ring, and the ball head screw, the screw seat and the elastic clamping ring are matched and fixed.
According to the universal pedicle screw, the screw seat is sleeved on the ball head part of the ball head screw, the second groove surrounding the inner wall is formed in the screw seat, the elastic clamping ring is arranged in the second groove, the ball head part of the ball head screw is clamped by the elastic clamping ring in an original state, and the ball head screw can rotate in a conical surface, so that the function of the universal pedicle screw is realized, and the process of placing the connecting rod is simplified; furthermore, after the placement position of the ball screw is determined, the ball screw is pressed and moved, and the elastic clamping ring has elasticity, so that the ball head portion is propped open the elastic clamping ring and the first groove is matched and fixed with the elastic clamping ring, the function of the uniaxial pedicle screw is realized, and the device has the characteristics of simple structure, convenience in operation, strong adaptability and the like.
As a preferred technical scheme of the present invention, the screw base is provided with a through hole penetrating in an axial direction, the screw base is sleeved on the ball head screw through the through hole, the through hole is divided into a straight hole section and a fixing section along a sleeving direction of the ball head screw, and the elastic snap ring is located between the straight hole section and the fixing section.
Preferably, the fixed section is further divided into a curved section and a cylindrical section, and the curved section is located on one side close to the elastic snap ring.
Preferably, one side of the ball head portion close to the threaded portion is a cylindrical neck portion, and in a matched and fixed state, the ball head portion is attached to the curved surface section, and the cylindrical neck portion is matched and fixed with the cylindrical section.
Preferably, the cylindrical neck and the cylindrical section are in a clearance fit with a minimum clearance of ≦ 0.1mm, for example, a minimum clearance of 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1 mm.
According to a preferred technical scheme of the invention, the screw seat with the straight hole section is provided with first U-shaped grooves which are oppositely arranged along the radial direction of the screw seat.
Preferably, the inner wall of one side of the straight hole section, which is far away from the elastic snap ring, is provided with a thread structure.
Preferably, the screw base is further provided with a punching and riveting hole, and a punching and riveting boss is formed on the inner wall of the screw base after punching and riveting of the punching and riveting hole.
As a preferred embodiment of the present invention, the elastic snap ring has a notch structure.
As a preferred technical scheme of the present invention, an inner wall of the elastic snap ring is of a curved surface structure, and the inner wall of the elastic snap ring is matched with the curved surface of the ball head portion when the ball head portion of the ball head screw is clamped by the elastic snap ring.
The elastic snap ring is provided with the notch structure, so that the force for opening the elastic snap ring by the ball head is reduced, and the curved surface structure matched with the curved surface of the ball head is arranged on the inner wall, so that the ball head screw can conveniently rotate.
Preferably, the outside diameter of the snap ring is larger than the inside diameter of the straight hole section.
Preferably, the outer diameter of the elastic clamping ring is smaller than the inner diameter of a screw seat where the second groove is located, and a gap is formed between the outer wall of the elastic clamping ring and the groove bottom of the second groove.
According to the invention, the elastic snap ring and the groove bottom of the second groove are provided with a gap, and a space is reserved when the ball head part stretches and deforms the elastic snap ring, so that the stretching resistance is reduced.
As a preferred technical scheme of the invention, the pedicle screw further comprises an anti-back ring positioned in the screw seat, and the anti-back ring is divided into an anti-back section and a matching section.
Preferably, the inner wall of the matching section is of a curved surface structure, and the inner wall of the matching section is matched with the curved surface of the ball head part.
In the invention, the inner wall of the matching section is also designed into a curved surface structure, thereby further ensuring the stability of the ball head part in the rotating process.
Preferably, the diameter of the anti-receding section is gradually reduced in a direction away from the fitting section.
Preferably, the outer wall of the anti-withdrawal ring where the anti-withdrawal section is located is provided with an inward concave structure corresponding to the position of the punching-riveting boss.
According to the invention, the punching rivet boss after punching rivet is matched with the concave structure, so that the anti-withdrawal ring is prevented from falling out of the screw seat.
Preferably, the anti-withdrawal section is provided with a second U-shaped groove, and the second U-shaped groove and the first U-shaped groove are provided along the same radial direction of the screw seat.
In a second aspect, the present invention provides a method for preparing the multipurpose pedicle screw according to the first aspect, wherein the method for preparing the multipurpose pedicle screw comprises the following steps:
and after the elastic clamping ring is placed in the second groove, the ball head screw is inserted into the screw seat, and the elastic clamping ring clamps the head of the main ball to prepare the pedicle screw.
As a preferred technical scheme of the invention, the preparation method specifically comprises the following steps:
after putting resilient snap ring into the second recess, insert the bulb screw in the screw seat, resilient snap ring card owner bulb portion will prevent moving back the ring and put into the screw seat again, makes the cooperation section and the bulb portion cooperation of preventing moving back the ring, and the counterpunch riveting hole is punched and is riveted and make the screw seat inner wall form and is punched and rivet the boss, and the boss is riveted with the indent structure cooperation of preventing moving back the section to punching, prevents to prevent moving back the ring and drops, and the preparation obtains the pedicle screw.
In a third aspect, the present invention provides a multipurpose pedicle screw fixation method as defined in the first aspect, the fixation method comprising:
the elastic clamping ring clamps the ball head portion of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, after the position of the ball head screw is determined, the ball head screw is moved to enable the ball head portion to stretch the elastic clamping ring, the first groove is matched with the elastic clamping ring, and the ball head screw, the screw seat and the elastic clamping ring are matched and fixed.
As a preferred technical solution of the present invention, the fixing method specifically includes the steps of:
the elastic clamping ring clamps the ball head part of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, after the position of the ball head screw is determined, the anti-backing ring is pressed to move the ball head screw, the ball head part is made to stretch the elastic clamping ring, the first groove is made to be matched with the elastic clamping ring, the ball head part is fixed with the curved surface section of the through hole in the screw seat in a matched mode, the cylindrical neck part is fixed with the cylindrical section in a matched mode, and the ball head screw, the anti-backing ring, the elastic clamping ring and the screw seat are made to be fixed.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the beneficial effects that:
according to the universal pedicle screw, the screw seat is sleeved on the ball head part of the ball head screw, the second groove surrounding the inner wall is formed in the screw seat, the elastic clamping ring is arranged in the second groove, the ball head part of the ball head screw is clamped by the elastic clamping ring in an original state, and the ball head screw can rotate in a conical surface, so that the function of the universal pedicle screw is realized, and the process of placing the connecting rod is simplified; furthermore, after the placement position of the ball screw is determined, the ball screw is pressed and moved, the elastic snap ring has elasticity, the ball screw can be placed into the second groove under the compression condition, the original size can be restored after the pressure is released, the elastic snap ring can be effectively prevented from falling off, the head portion of the ball screw props up the elastic snap ring and enables the first groove and the elastic snap ring to be matched and fixed, the function of the uniaxial pedicle screw is achieved, and the screw has the advantages of being simple in structure, convenient to operate, high in adaptability and the like.
Drawings
FIG. 1 is a schematic structural view of a multipurpose pedicle screw provided in one embodiment of the invention;
FIG. 2 is a schematic view of a multi-purpose pedicle screw provided in one embodiment of the invention in a disassembled configuration;
FIG. 3 is a schematic structural view of a screw receptacle provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an appearance of a retaining ring according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of an anti-back-out ring according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a ball screw provided in one embodiment of the present invention;
FIG. 7 is a cross-sectional view of a snap ring according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a top view of a snap ring according to an embodiment of the present invention;
FIG. 9 is a schematic view of a multi-purpose pedicle screw provided in one embodiment of the invention in a rotated state;
FIG. 10 is a schematic view illustrating the position adjustment of a multipurpose pedicle screw in a rotating state, wherein a, b, c and d represent different position states, respectively, according to an embodiment of the invention;
fig. 11 is a structural view of a multipurpose pedicle screw provided in an embodiment of the invention, in a fixed state, and the arrow direction represents the pressure direction, i.e., the movement direction of the ball screw.
Wherein, 1-screw seat; 2-ring withdrawal prevention; 3-ball head screw; 4-elastic snap ring; 11-a thread structure; 12-a second groove; 13-a curved surface section; 14-a columnar section; 15-a first U-shaped slot; 21-a second U-shaped slot; 22-a concave structure 22; 23-a mating segment; 24-anti-receding section; 31-a threaded portion; 32-a cylindrical neck; 33-a bulb section; 34-a first groove; 41-the outer wall of the elastic snap ring; 42-inner wall of elastic snap ring; 43-notch structure.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments.
In a specific embodiment, the present invention provides a multipurpose pedicle screw, as shown in fig. 1, 2, 3 and 6, the pedicle screw includes a ball screw 3, the ball screw 3 is divided into a threaded portion 31 and a ball portion 33 along an axial direction, the ball portion 33 is sleeved with a screw seat 1, the ball portion 33 is provided with a first groove 34 surrounding the ball portion 33, the screw seat 1 is provided with a second groove 12 surrounding an inner wall, and an annular elastic snap ring 4 is arranged in the second groove 12; as shown in fig. 9 and 10, the elastic snap ring 4 is clamped on the ball head 33 of the ball screw 3, and the ball screw 3 rotates in a conical surface along the circumferential direction of the ball screw 3, for example, to positions a, b, c and d; as shown in fig. 11, the ball head 33 of the ball screw 3 is moved to expand the elastic snap ring 4, the first groove 34 is matched with the elastic snap ring 4, and the ball screw 3, the screw seat 1 and the elastic snap ring 4 are matched and fixed.
According to the universal pedicle screw, the screw seat 1 is sleeved on the ball head part 33 of the ball head screw 3, the second groove 12 surrounding the inner wall is formed in the screw seat 1, the elastic clamping ring 4 is arranged in the second groove 12, the ball head part 33 of the ball head screw 3 is clamped by the elastic clamping ring 4 in an original state, and the ball head screw 3 can rotate in a conical surface, so that the function of a universal pedicle screw is realized, and the process of placing a connecting rod is simplified; further, confirm behind the position of placing of ball screw 3, press and remove ball screw 3, because circlip 4 has elasticity, can pack into second recess 12 under the circumstances of compression, can resume original size again after the pressure release, can effectively prevent droing of circlip 4, bulb 33 struts circlip 4 and makes first recess 34 fixed with circlip 4 cooperation, realizes the function of unipolar pedicle of vertebral arch nail, has simple structure, be convenient for operation and characteristics such as strong adaptability.
Further, as shown in fig. 3, a through hole penetrating along the axial direction is formed in the screw base 1, the ball screw 3 is sleeved on the screw base 1 through the through hole, the through hole is divided into a straight hole section and a fixing section along the sleeving direction of the ball screw 3, and the elastic clamping ring 4 is located between the straight hole section and the fixing section. The fixed section is further divided into a curved section 13 and a cylindrical section 14, and the curved section 13 is positioned at one side close to the elastic snap ring 4. One side of the ball head part 33 close to the thread part 31 is a cylindrical neck part 32, and in a matching and fixing state, the ball head part 33 is attached to the curved surface section 13, and the cylindrical neck part 32 is matched and fixed with the cylindrical section 14. The cylindrical neck 32 and the cylindrical section 14 are in clearance fit, and the minimum clearance of the clearance fit is less than or equal to 0.1 mm.
Further, along the radial direction of the screw base 1, the screw base 1 where the straight hole section is located is provided with a first U-shaped groove 15 which is oppositely arranged. The inner wall of one side of the straight hole section, which is far away from the elastic snap ring 4, is provided with a thread structure 11. The screw base 1 is further provided with a punching and riveting hole, and a punching and riveting boss is formed on the inner wall of the screw base 1 after the punching and riveting of the punching and riveting hole.
Further, as shown in fig. 7 and 8, the snap ring 4 has a notch structure 43. The inner wall 42 of the elastic clamping ring 4 is of a curved surface structure, and the inner wall 42 of the elastic clamping ring 4 is matched with the curved surface of the ball head 33 under the state that the ball head 33 of the ball head screw 3 is clamped by the elastic clamping ring 4. The outer diameter of the elastic snap ring 4 is larger than the inner diameter of the straight hole section. According to the invention, the elastic snap ring 4 is provided with the notch structure 43, so that the force for the ball head part 33 to prop the elastic snap ring 4 is reduced, and the curved surface structure matched with the curved surface of the ball head part 33 is arranged on the inner wall, so that the ball head screw 3 can conveniently rotate. The outer diameter of the elastic snap ring 4 is smaller than the inner diameter of the screw seat 1 where the second groove 12 is located, and a gap is formed between the outer wall 41 of the elastic snap ring 4 and the groove bottom of the second groove 12.
Further, as shown in fig. 4 and 5, the pedicle screw further comprises an anti-back ring 2 located inside the screw seat 1, the anti-back ring 2 is divided into an anti-back section 24 and a matching section 23, the inner wall of the matching section 23 is of a curved surface structure, and the inner wall of the matching section 23 is matched with the curved surface of the ball head portion 33. The diameter of the withdrawal prevention section 24 gradually decreases in a direction away from the fitting section 23. An inner concave structure 22 corresponding to the position of the rivet punching boss is arranged on the outer wall of the anti-withdrawal ring 2 where the anti-withdrawal section 24 is located, a second U-shaped groove 21 is arranged on the anti-withdrawal section 24, and the second U-shaped groove 21 and the first U-shaped groove 15 are arranged along the same radial direction of the screw base 1.
In the invention, the inner wall of the matching section 23 is also designed into a curved surface structure, so that the stability of the ball head part 33 in the rotating process is further ensured. According to the invention, the punching riveting boss after punching riveting is matched with the concave structure 22, so that the anti-withdrawal ring 2 is prevented from falling out of the screw seat 1.
In another embodiment, the present invention provides a method for preparing the multipurpose pedicle screw, wherein the method comprises the following steps:
after putting into second recess 12 with elastic snap ring 4 back, insert ball screw 3 in screw seat 1, elastic snap ring 4 card main bulb portion 33 will prevent moving back in ring 2 puts into screw seat 1 again, makes the cooperation section 23 and the cooperation of bulb portion 33 of preventing moving back ring 2, and the counterpunch riveting hole is punched and is riveted and make 1 inner wall of screw seat form and is punched and rivet the boss, and the boss is riveted with the cooperation of preventing moving back indent structure 22 of section 24 to punching, prevents to move back ring 2 and drops, and the preparation obtains pedicle screw.
The invention provides a fixing method of the multipurpose pedicle screw, which specifically comprises the following steps:
the head portion 33 of the ball screw 3 is clamped by the elastic clamping ring 4, the ball screw 3 rotates in a conical surface mode along the circumferential direction of the ball screw 3, the ball screw 3 is moved by pressing the anti-backing ring 2 after the position of the ball screw 3 is determined, the elastic clamping ring 4 is opened by the ball portion 33, the first groove 34 is matched with the elastic clamping ring 4, the ball portion 33 is matched and fixed with the curved surface section 13 of the through hole in the screw seat 1, the cylindrical neck portion 32 is matched and fixed with the cylindrical section 14, and the ball screw 3, the anti-backing ring 2, the elastic clamping ring 4 and the screw seat 1 are fixed.
According to the universal pedicle screw, the screw seat 1 is sleeved on the ball head part 33 of the ball head screw 3, the second groove 12 surrounding the inner wall is formed in the screw seat 1, the elastic clamping ring 4 is arranged in the second groove 12, the ball head part 33 of the ball head screw 3 is clamped by the elastic clamping ring 4 in an original state, and the ball head screw 3 can rotate in a conical surface, so that the function of a universal pedicle screw is realized, and the process of placing a connecting rod is simplified; furthermore, after the placement position of the ball screw 3 is determined, the ball screw 3 is pressed and moved, and the elastic clamping ring 4 has elasticity, the ball head part 33 stretches the elastic clamping ring 4 and enables the first groove 34 to be matched and fixed with the elastic clamping ring 4, so that the function of the uniaxial pedicle screw is realized, and the device has the characteristics of simple structure, convenience in operation, strong adaptability and the like.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The multipurpose pedicle screw is characterized by comprising a ball head screw, wherein the ball head screw is divided into a threaded part and a ball head part along the axial direction, the ball head part is sleeved with a screw seat, the ball head part is provided with a first groove surrounding the ball head part, the screw seat is provided with a second groove surrounding the inner wall, and an annular elastic snap ring is arranged in the second groove;
the elastic clamping ring clamps the ball head portion of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, the ball head portion of the ball head screw is moved, the elastic clamping ring is opened, the first groove is matched with the elastic clamping ring, and the ball head screw, the screw seat and the elastic clamping ring are matched and fixed.
2. The pedicle screw according to claim 1, wherein the screw base is provided with a through hole which penetrates in the axial direction, the screw base is sleeved on the ball head screw through the through hole, the through hole is divided into a straight hole section and a fixing section along the sleeving direction of the ball head screw, and the elastic clamping ring is positioned between the straight hole section and the fixing section;
preferably, the fixing section is further divided into a curved section and a cylindrical section, and the curved section is positioned at one side close to the elastic snap ring;
preferably, one side of the ball head part, which is close to the threaded part, is a cylindrical neck part, and in a matched and fixed state, the ball head part is attached to the curved surface section, and the cylindrical neck part is matched and fixed with the cylindrical section;
preferably, the cylindrical neck and the cylindrical section are in clearance fit, and the minimum clearance of the clearance fit is less than or equal to 0.1 mm.
3. The pedicle screw according to claim 1 or 2, wherein the screw seat with the straight hole section is provided with first U-shaped grooves which are oppositely arranged along the radial direction of the screw seat;
preferably, a thread structure is arranged on the inner wall of one side, away from the elastic clamping ring, of the straight hole section;
preferably, the screw base is further provided with a punching and riveting hole, and a punching and riveting boss is formed on the inner wall of the screw base after punching and riveting of the punching and riveting hole.
4. The pedicle screw according to any one of claims 1-3, wherein the snap ring has a notched structure.
5. The pedicle screw according to any one of claims 1 to 4, wherein the inner wall of the elastic clamping ring is of a curved surface structure, and the inner wall of the elastic clamping ring is matched with the curved surface of the ball head part in a state that the ball head part of the ball head screw is clamped by the elastic clamping ring;
preferably, the outer diameter of the elastic snap ring is larger than the inner diameter of the straight hole section;
preferably, the outer diameter of the elastic clamping ring is smaller than the inner diameter of a screw seat where the second groove is located, and a gap is formed between the outer wall of the elastic clamping ring and the groove bottom of the second groove.
6. A pedicle screw according to any one of claims 1-5, further comprising a back-proof ring inside the screw seat, the back-proof ring being divided into a back-proof section and a mating section;
preferably, the inner wall of the matching section is of a curved surface structure, and the inner wall of the matching section is matched with the curved surface of the ball head part;
preferably, the diameter of the anti-receding section is gradually reduced in the direction away from the matching section;
preferably, the outer wall of the anti-withdrawal ring where the anti-withdrawal section is located is provided with an inward concave structure corresponding to the position of the punching and riveting boss;
preferably, the anti-withdrawal section is provided with a second U-shaped groove, and the second U-shaped groove and the first U-shaped groove are provided along the same radial direction of the screw seat.
7. The method for preparing the multipurpose pedicle screw as claimed in any one of claims 1 to 6, wherein the method for preparing the multipurpose pedicle screw comprises the following steps:
and after the elastic clamping ring is placed in the second groove, the ball head screw is inserted into the screw seat, and the elastic clamping ring clamps the head of the main ball to prepare the pedicle screw.
8. The preparation method according to claim 7, wherein the preparation method specifically comprises the following steps:
after putting resilient snap ring into the second recess, insert the bulb screw in the screw seat, resilient snap ring card owner bulb portion will prevent moving back the ring and put into the screw seat again, makes the cooperation section and the bulb portion cooperation of preventing moving back the ring, and the counterpunch riveting hole is punched and is riveted and make the screw seat inner wall form and is punched and rivet the boss, and the boss is riveted with the indent structure cooperation of preventing moving back the section to punching, prevents to prevent moving back the ring and drops, and the preparation obtains the pedicle screw.
9. The multipurpose pedicle screw fixing method according to any one of claims 1 to 6, wherein the fixing method comprises:
the elastic clamping ring clamps the ball head portion of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, after the position of the ball head screw is determined, the ball head screw is moved to enable the ball head portion to stretch the elastic clamping ring, the first groove is matched with the elastic clamping ring, and the ball head screw, the screw seat and the elastic clamping ring are matched and fixed.
10. The method according to claim 9, characterized in that it comprises in particular the following steps:
the elastic clamping ring clamps the ball head part of the ball head screw, the ball head screw rotates in a conical surface mode along the circumferential direction of the ball head screw, after the position of the ball head screw is determined, the anti-backing ring is pressed to move the ball head screw, the ball head part is made to stretch the elastic clamping ring, the first groove is made to be matched with the elastic clamping ring, the ball head part is fixed with the curved surface section of the through hole in the screw seat in a matched mode, the cylindrical neck part is fixed with the cylindrical section in a matched mode, and the ball head screw, the anti-backing ring, the elastic clamping ring and the screw seat are made to be fixed.
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| CN202110454127.0A CN113171166B (en) | 2021-04-26 | 2021-04-26 | Multipurpose pedicle screw, preparation method and fixing method thereof |
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| CN202110454127.0A CN113171166B (en) | 2021-04-26 | 2021-04-26 | Multipurpose pedicle screw, preparation method and fixing method thereof |
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| CN113171166B (en) | 2022-06-14 |
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