CN112120774B - Extension nail cap of pedicle of vertebral arch nail - Google Patents
Extension nail cap of pedicle of vertebral arch nail Download PDFInfo
- Publication number
- CN112120774B CN112120774B CN202010976041.XA CN202010976041A CN112120774B CN 112120774 B CN112120774 B CN 112120774B CN 202010976041 A CN202010976041 A CN 202010976041A CN 112120774 B CN112120774 B CN 112120774B
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- handle
- nut
- spring
- extension
- pedicle screw
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000001125 extrusion Methods 0.000 claims abstract description 21
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 235000014676 Phragmites communis Nutrition 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000007012 clinical effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000399 orthopedic effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from 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
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
Abstract
The embodiment of the invention relates to an extension nail cap of a pedicle screw, which comprises an extension nail cap body, a handle, an elastic pushing component, steel balls, a spring, a base and a squeeze plate; the extension nut body is internally provided with a toothed structure, and the bottom of the extension nut body is provided with a guide rail and a second spherical groove; the handle is inserted into the extension nut body; one end of the elastic pushing component is connected with the bottom of the handle, one end of the elastic pushing component is provided with a bottom plate, and the steel ball is arranged on the bottom plate; two ends of the spring are respectively connected with the elastic pushing part and the base; the base is provided with a support column for limiting the movement distance of the elastic pushing component; the extrusion plate is connected with the handle and used for extruding the elastic pushing component so as to extrude the steel ball into the first spherical groove. The pedicle screw extension nut is reasonable in structure, safe and reliable in performance, capable of conveniently and rapidly achieving fixation and separation of the extension nut and the pedicle screw, shortened in operation time and good in clinical effect.
Description
Technical Field
The invention relates to the field of orthopedic medical instruments, in particular to an extension nut of a pedicle screw.
Background
In modern orthopaedics operation, minimally invasive thoracolumbar vertebral pedicle screw technology has become a technical means for internal fixation of the posterior approach of the spine, and percutaneous pedicle minimally invasive technology has been widely applied to treatment of diseases such as spine fracture, lumbar vertebra slipping, percutaneous vertebral body strengthening and the like. In the orthopedic surgery, certain requirements are imposed on the length of the pedicle screw caps, and the pedicle screw caps can be conveniently disassembled and assembled.
However, the existing pedicle screw caps are all integrally formed by mechanical processing, and the pedicle screw caps are broken by applying great force to the screw tails by external instruments in the clinical operation process, so that the operation time is prolonged, and the pain of patients is increased.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides the extension nail cap of the pedicle screw, which is matched with the nail cap of the pedicle screw for use, has reasonable structure, safe and reliable performance, can conveniently and rapidly realize the fixation and separation of the extension nail cap and the pedicle screw, can reduce the configuration of surgical instruments, shortens the operation time, reduces the pain of patients, and has good clinical effect.
In view of the above, the embodiment of the invention provides an extension screw cap of a pedicle screw, wherein the upper part of the pedicle screw is provided with a screw cap, and the screw cap is internally provided with a guide rail groove and a first spherical groove; the extension nut comprises an extension nut body, a handle, an elastic pushing component, steel balls, a spring, a base and an extrusion plate;
the upper part of the side wall in the extension nut body is provided with a tooth-shaped structure, and the bottom of the extension nut body is provided with a guide rail matched with the guide rail groove and a second spherical groove matched with the steel ball;
the handle is inserted into the extended nut body, and the bottom of the handle is provided with a tooth piece which is meshed with the tooth-shaped structure of the extended nut body;
one end of the elastic pushing component is connected with the bottom of the handle, one end of the elastic pushing component is provided with a bottom plate, and the steel ball is arranged on the bottom plate;
one end of the spring is connected with the bottom end of the elastic pushing component, and the other end of the spring is connected with the base;
the base is provided with a support column which is used for being matched with the bottom end of the elastic pushing component to limit the movement distance of the elastic pushing component;
one end of the extrusion plate is connected with the bottom of the handle and used for extruding the elastic pushing component, so that the steel ball is extruded into the first spherical groove.
Preferably, when the handle is subjected to a first external force, the handle is pressed down for a first distance, and the tooth piece of the handle is meshed with the tooth-shaped structure at the upper part of the extension nut body, so that the extrusion plate and the elastic pushing component are driven to move downwards until the bottom of the elastic pushing component is propped against the top of the support column, at the moment, the steel balls are pushed to a preset position, and at the moment, the spring is in a compressed state;
when the handle continues to bear the second external force, the handle presses down for a second distance, the tooth piece of the handle is continuously meshed with the tooth-shaped structure at the upper part of the extension nut body to drive the extrusion plate to continuously move downwards, the extrusion plate extrudes the elastic pushing component, and then the steel balls are pushed into the first spherical groove of the nut from the second spherical groove, so that the extension nut and the nut are fixed, and the spring is in a compressed state;
when the handle continues to receive the third external force, the tooth piece of handle breaks away from the tooth-like structure on extension nut body upper portion, at this moment under the reaction force of spring, elasticity push part, stripper plate upward movement to drive the handle upward movement resumes initial state, and then realizes the extension nut with the breaking away from of nut.
Further preferably, the first distance is 1.58 mm-1.65 mm; the second distance is 3.0 mm-3.1 mm.
Preferably, the toothed structure is an arc-shaped rack, the angle of the arc-shaped rack is 7-10 degrees, and the number of teeth is 7-8 teeth.
Preferably, the elastic pushing component comprises a first pushing strip, a special-shaped spring and a second pushing strip;
the first pushing strip is connected with the bottom end of the handle;
two ends of the special-shaped spring are respectively connected with the first pushing strip and the second pushing strip; wherein the special-shaped spring is an X-shaped spring, the height is 7.6 mm-8 mm, the compression amount is 3.2 mm-3.5 mm, and the thickness of the reed is 0.14 mm-0.18 mm; the method comprises the steps of carrying out a first treatment on the surface of the
The bottom of the second pushing strip is provided with the bottom plate, and the steel balls are arranged on the bottom plate.
Preferably, the extension nut further comprises an upper cover, and the upper cover is buckled at the top of the extension nut body.
Preferably, the extension nut further comprises a rebound piece, the rebound piece is used for being matched with the steel ball, when the extrusion plate moves upwards under the reaction force of the spring, the rebound piece rebounds the steel ball to the initial position at the same time, and the thickness of the rebound piece is 0.1-0.12 mm.
Further preferably, the extension nut further comprises a fixing plate fixed on the side wall in the extension nut body for fixing the rebound piece.
Preferably, the nail cap is internally provided with two guide rail grooves, and the bottom of the extended nail cap body is provided with two guide rails.
Preferably, the height of the spring is 4 mm-4.2 mm, the diameter of the steel wire is 0.2 mm-0.22 mm, the pitch is 0.9 mm-0.92 mm, the curvature coefficient is 10-10.1, the height-diameter ratio is 2-2.1, the helix angle is 8.2-8.6 degrees, and the elasticity coefficient is 1.143N/mm-1.146N/mm;
the extrusion amount of the steel ball is 0.45 mm-0.5 mm.
The extension nail cap of the pedicle screw provided by the embodiment of the invention is matched with the nail cap of the pedicle screw, has reasonable structure and safe and reliable performance, can conveniently and rapidly realize the fixation and separation of the extension nail cap and the pedicle screw, can reduce the configuration of surgical instruments, shortens the operation time, reduces the pain of patients, and has good clinical effects.
Drawings
FIG. 1 is a schematic view of an extension nut and nut combination of a pedicle screw according to an embodiment of the invention;
fig. 2 is a schematic structural view of a cap of a pedicle screw according to an embodiment of the invention;
FIG. 3 is a schematic view of an extended nut of a pedicle screw according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of an extended nut of a pedicle screw in accordance with an embodiment of the invention;
FIG. 5 is a partial schematic view of an extended nut of a pedicle screw according to an embodiment of the invention;
FIG. 6 is a schematic view of a handle according to an embodiment of the present invention;
FIG. 7 is a partial schematic view of another extended nut provided in accordance with an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an elastic pushing component according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a base according to an embodiment of the present invention;
fig. 10 is a schematic structural view of an extrusion plate according to an embodiment of the present invention;
FIG. 11 is a schematic view of a rebound piece according to an embodiment of the present invention;
fig. 12 is a schematic structural view of a fixing plate according to an embodiment of the present invention;
fig. 13 is a schematic structural view of an upper cover according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
The extension screw cap of the pedicle screw is matched with the screw cap of the pedicle screw, and structures of the screw cap and the extension screw cap of the pedicle screw are respectively introduced below.
First, the structure of the pedicle screw cap will be described.
Fig. 1 is a schematic diagram of an extension nut and nut combination of a pedicle screw according to an embodiment of the invention, fig. 2 is a schematic diagram of a nut structure of a pedicle screw according to an embodiment of the invention, and in combination with fig. 1 to 2, a nut 1 is provided at an upper portion of the pedicle screw, in this embodiment, the nut 1 is of U-shaped design, two mounting grooves 11 are provided, two extension nuts 2 can be inserted at the same time, a guide rail groove 111 and a first ball-shaped groove 112 are provided on a side wall in the mounting groove 11 of the nut 1, the guide rail groove 111 is used for realizing insertion of the extension nut 2, and the first ball-shaped groove is used for realizing fixation of the nut 1 and the extension nut 2. It should be noted that, those skilled in the art may select and set the number and positions of the mounting slots 11 of the nut 1 and the number of the extended nut 2 according to actual needs.
Next, the structure of the pedicle screw extension nut 2 will be described.
Referring to fig. 1, 3, 4 and 5, the extended nut 2 specifically includes an extended nut body 21, a handle 22, an elastic pushing member 23, steel balls 24, a spring 25, a base 26 and a pressing plate 27.
As shown in fig. 3, the top of the extended nut body 21 has an opening for inserting the handle 22; the upper part of the side wall in the extension nut body 21 is provided with a tooth-shaped structure 211 for being matched with the handle 22; the bottom of the extended nut body 21 is provided with a guide rail 212 matched with the guide rail groove 111 of the nut 1, and further, the bottom side wall of the extended nut body 21 is provided with a second spherical groove 213 matched with the steel ball 24. Further, a screw structure is provided on the outer wall of the extension nut body 21. In this example, two guide rail grooves 111 are preferably provided in the nut 1, and two guide rails 212 adapted to each other are provided at the bottom of the extended nut body 21, so that the fixing and detachment of the nut 2 on the nut 1 can be conveniently extended, and the stability of assembly can be ensured.
As shown in fig. 6 and 7, the bottom of the handle 22 is provided with a tooth piece 221 which is meshed with the tooth-shaped structure 211 of the extended nut body 21, the handle 22 is inserted into the extended nut body 21 from the opening at the top of the extended nut body 21, and further, the handle 22 is provided with two oval holes 222 which are matched with two pins 214 of the extended nut body 21, thereby limiting the movement direction of the handle 22. In the preferred embodiment, two toothed structures 211 are arranged at the upper part of the side wall in the extended nut body 21, the toothed structures 211 are arc racks, the angle of the arc racks is 7-10 degrees, the tooth number is preferably 7-8 teeth, and two corresponding thin tooth sheets 221 are arranged at the bottom of the handle 22 and meshed with the racks. It should be noted that, those skilled in the art may set the tooth structure 211, the angle and the number of racks, and the structure and thickness of the tooth plate 221 according to actual needs.
As shown in fig. 5 and 8, one end of the elastic pushing member 23 is connected to the bottom of the handle 22, one end of the elastic pushing member 23 has a bottom plate 2330, and the steel ball is disposed on the bottom plate 2330. In a specific example, the elastic pushing member 23 specifically includes a first pushing bar 231, a profiled spring 232, and a second pushing bar 233, where the first pushing bar 231 is connected to the bottom end of the handle 22; two ends of the special-shaped spring 232 are respectively connected with the first push bar 231 and the second push bar 233; the special-shaped spring 232 is an X-shaped spring, the height is 7.6 mm-8 mm, the compression amount is 3.2 mm-3.5 mm, the thickness of the reed is 0.14 mm-0.18 mm, in the field, the height of the X-shaped spring is preferably 7.8mm, the compression amount is preferably 3.2mm, and the thickness of the reed is preferably 0.16mm; the bottom of the second pushing bar 233 is provided with a bottom plate 2330, and steel balls are arranged on the bottom plate 2330.
As shown in FIG. 5, one end of the spring 25 is connected to the bottom end of the elastic pushing member 23, the other end of the spring 25 is connected to the base 26, the spring 25 is a cylindrical spring 25, the height of the spring is 4 mm-4.2 mm, the diameter of the wire is 0.2 mm-0.22 mm, the pitch is 0.9 mm-0.92 mm, the curvature coefficient is 10-10.1, the height-diameter ratio is 2-2.1, the helix angle is 8.2-8.6 DEG, the elasticity coefficient is 1.143N/mm-1.146N/mm, the height is preferably 4mm, the diameter of the wire is preferably 0.2mm, the pitch is preferably 0.9mm, the curvature coefficient is preferably 10, the height-diameter ratio is preferably 2, the helix angle is preferably 8.4 DEG, and the elasticity coefficient is preferably 1.145N/mm.
As shown in fig. 5 and 9, the base 26 is provided with a support column 261 for cooperating with the bottom end of the elastic push member 23, thereby limiting the movement distance of the elastic push member 23.
Referring to fig. 5 and 10, one end of the extruding plate 27 is connected to the bottom of the handle 22, specifically, a fixing pin may be set at the bottom of the handle 22, an oval key slot is formed at the upper end of the extruding plate 27, and the length is preferably 1.9mm, and the oval key slot is matched with the fixing pin of the handle 22 to realize up-and-down reciprocating motion, so as to extrude the elastic pushing component 23, thereby extruding the steel ball into the first spherical groove 112 to realize the fixing effect.
In a preferred embodiment, as shown in fig. 4, 5 and 11, the extended nut 2 further includes a rebound piece 29 for cooperating with the steel ball, and when the pressing plate 27 moves upward under the reaction force of the spring 25, the rebound piece 29 rebounds the steel ball 24 to the initial position at the same time, the thickness of the rebound piece 29 is 0.1mm to 0.12mm, and the pressing amount of the steel ball is 0.45mm to 0.5mm. In this case, the pressing amount of the steel ball is preferably 0.5mm, and the thickness of the return spring 29 is preferably 0.1mm.
Further, as shown in fig. 4, 5 and 12, the extended nut 2 further includes a fixing plate 290, a round hole adapted to the steel ball is formed in the fixing plate 290, and the fixing plate 290 is fixed on the side wall of the extended nut body 21 and used for fixing the return spring 29, so as to ensure stability of the return spring 29.
Referring to fig. 3 and 13, in order to ensure stability of the handle 22 during the up-and-down movement, the extended nut 2 further includes an upper cover 28, the upper cover 28 is fastened to the top of the extended nut body 21, and a through hole adapted to the handle 22 is formed in the upper cover 28.
The following description is given of the use process of the pedicle screw cap 1 and the extension screw cap 2 on the basis of understanding the structures thereof.
When the handle 22 receives a first external force, the handle 22 is pressed down for a first distance, and the tooth piece 221 of the handle 22 is meshed with the tooth-shaped structure 211 at the upper part of the extended nut body 21, so that the extrusion plate 27 and the elastic pushing component 23 are driven to move downwards until the bottom of the elastic pushing component 23 abuts against the top of the supporting column 261, and cannot move downwards, at this time, the steel ball 24 is pushed to a preset position, which is the second spherical groove 213, and at this time, the spring 25 is in a compressed state.
When the handle 22 continues to receive the second external force, the handle 22 presses down the second distance, the tooth piece 221 of the handle 22 is continuously meshed with the tooth structure 211 on the upper portion of the extended nut body 21, and drives the extrusion plate 27 to continuously move downwards, because the bottom of the elastic pushing component 23 is propped against the top of the supporting column 261, the extrusion plate 27 cannot move downwards, and the elastic pushing component 23 is extruded by the extrusion plate 27, so that the steel balls 24 are pushed into the first spherical groove 112 of the nut 1 from the second spherical groove 213, thereby realizing the fixation of the extended nut 2 and the nut 1, and the spring 25 is still in a compressed state.
When the handle 22 continues to receive the third external force, the tooth piece 221 of the handle 22 is separated from the tooth-shaped structure 211 at the upper part of the extended nut body 21, and at this time, the elastic pushing component 23 and the extrusion plate 27 move upwards under the reaction force of the spring 25, so as to drive the handle 22 to move upwards, restore to the initial state, and further realize the separation of the extended nut 2 and the nut 1.
It should be noted that, the first external force, the second external force, the third external force, the first distance and the second distance may be selected and set by those skilled in the art according to the need, and in the art, the first distance is 1.58mm to 1.65mm; the second distance is 3.0 mm-3.1 mm, preferably the first distance is 1.6mm; the second distance is 3.0mm.
When a doctor performs an operation by using the extended nut 2 provided by the embodiment of the invention, the extended nut body 21 is inserted into the bottom along the guide groove of the nut 1, the handle 22 is pressed, the tooth piece 221 on the handle 22 is meshed with the arc-shaped rack on the upper section of the extended nut body 21, the elastic pushing component 23 is pressed down to send the steel ball 24 to a preset position, at the moment, the handle 22 is continuously pressed down, the extrusion plate 27 is driven to extrude the elastic pushing component 23 to extrude the steel ball into the first spherical groove 112 of the nut 1, and the purpose that the nut 1 is connected and fixed with the extended nut 2 is achieved. After the operation is finished, the handle 22 is continuously pressed down, the tooth piece 221 of the handle 22 is completely separated from the arc-shaped rack, and at the moment, the handle 22 is rebounded to the initial position by the reaction force of the compression spring 25 through the elastic pushing component 23, so that the separation of the nail cap 1 and the extension nail cap 2 is realized, compared with the prior art that the nail tail is broken by applying great force to the nail tail by using an external instrument, the configuration of the surgical instrument can be reduced, the operation time is shortened, the pain of a patient is reduced, and the clinical effect is very good.
The extension nail cap of the pedicle screw provided by the embodiment of the invention is matched with the nail cap of the pedicle screw, has reasonable structure and safe and reliable performance, can conveniently and rapidly realize the fixation and separation of the extension nail cap and the pedicle screw, can reduce the configuration of surgical instruments, shortens the operation time, reduces the pain of patients, and has good clinical effects.
In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description herein, the terms "one particular embodiment," "some embodiments," "one embodiment," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. An extension nail cap of a pedicle screw is characterized in that the upper part of the pedicle screw is provided with a nail cap, and a guide rail groove and a first spherical groove are arranged in the nail cap; the extension nut comprises an extension nut body, a handle, an elastic pushing component, steel balls, a spring, a base and an extrusion plate;
the upper part of the side wall in the extension nut body is provided with a tooth-shaped structure, and the bottom of the extension nut body is provided with a guide rail matched with the guide rail groove and a second spherical groove matched with the steel ball;
the handle is inserted into the extended nut body, and the bottom of the handle is provided with a tooth piece which is meshed with the tooth-shaped structure of the extended nut body;
one end of the elastic pushing component is connected with the bottom of the handle, one end of the elastic pushing component is provided with a bottom plate, and the steel balls are arranged on the bottom plate;
one end of the spring is connected with the bottom end of the elastic pushing component, and the other end of the spring is connected with the base;
the base is provided with a support column which is used for being matched with the bottom end of the elastic pushing component to limit the movement distance of the elastic pushing component;
one end of the extrusion plate is connected with the bottom of the handle and used for extruding the elastic pushing component, so that the steel balls are extruded into the first spherical groove.
2. The extended nut of pedicle screw as claimed in claim 1, characterized in that,
when the handle is subjected to a first external force, the handle is pressed down for a first distance, and a tooth piece of the handle is meshed with a tooth-shaped structure at the upper part of the extension nut body, so that the extrusion plate and the elastic pushing component are driven to move downwards until the bottom of the elastic pushing component is propped against the top of the support column, at the moment, the steel balls are pushed to a preset position, and at the moment, the spring is in a compressed state;
when the handle continues to bear the second external force, the handle presses down for a second distance, the tooth piece of the handle is continuously meshed with the tooth-shaped structure at the upper part of the extension nut body to drive the extrusion plate to continuously move downwards, the extrusion plate extrudes the elastic pushing component, and then the steel balls are pushed into the first spherical groove of the nut from the second spherical groove, so that the extension nut and the nut are fixed, and the spring is in a compressed state;
when the handle continues to receive the third external force, the tooth piece of handle breaks away from the tooth-like structure on extension nut body upper portion, at this moment under the reaction force of spring, elasticity push part, stripper plate upward movement to drive the handle upward movement resumes initial state, and then realizes the extension nut with the breaking away from of nut.
3. The extended nut of pedicle screw as claimed in claim 2, wherein the first distance is 1.58-1.65 mm; the second distance is 3.0 mm-3.1 mm.
4. The extended nut of pedicle screw as claimed in claim 1, characterized in that the toothed structure is an arc-shaped rack with an angle of 7 ° to 10 ° and a number of teeth of 7 teeth to 8 teeth.
5. The extended nut of pedicle screw as claimed in claim 1, characterized in that the elastic pushing member comprises a first pushing bar, a profiled spring and a second pushing bar;
the first pushing strip is connected with the bottom end of the handle;
two ends of the special-shaped spring are respectively connected with the first pushing strip and the second pushing strip; wherein the special-shaped spring is an X-shaped spring, the height is 7.6 mm-8 mm, the compression amount is 3.2 mm-3.5 mm, and the thickness of the reed is 0.14 mm-0.18 mm;
the bottom of the second pushing strip is provided with the bottom plate, and the steel balls are arranged on the bottom plate.
6. The extended nut of pedicle screw as claimed in claim 1, characterized in that it further comprises an upper cover that is fastened to the top of the body of the extended nut.
7. The extended nut of a pedicle screw as claimed in claim 1, further comprising a return spring for cooperation with the steel balls, the return spring simultaneously returning the steel balls to an initial position when the compression plate moves upward under the reaction force of the spring, the return spring having a thickness of 0.1mm to 0.12mm.
8. The extended nut of a pedicle screw as claimed in claim 7, further comprising a fixing plate fixed to a side wall of the extended nut body for fixing the resilient sheet.
9. The extended nut of pedicle screw as claimed in claim 1, characterized in that the nut has two guide rail grooves inside, and the bottom of the extended nut body has two guide rails.
10. The extended nut of pedicle screw as claimed in claim 1, characterized in that,
the height of the spring is 4 mm-4.2 mm, the diameter of the steel wire is 0.2 mm-0.22 mm, the pitch is 0.9 mm-0.92 mm, the curvature coefficient is 10-10.1, the height-diameter ratio is 2-2.1, the helix angle is 8.2-8.6 degrees, and the elasticity coefficient is 1.143N/mm-1.146N/mm;
the extrusion amount of the steel balls is 0.45 mm-0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976041.XA CN112120774B (en) | 2020-09-16 | 2020-09-16 | Extension nail cap of pedicle of vertebral arch nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976041.XA CN112120774B (en) | 2020-09-16 | 2020-09-16 | Extension nail cap of pedicle of vertebral arch nail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112120774A CN112120774A (en) | 2020-12-25 |
| CN112120774B true CN112120774B (en) | 2024-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010976041.XA Active CN112120774B (en) | 2020-09-16 | 2020-09-16 | Extension nail cap of pedicle of vertebral arch nail |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113384336B (en) * | 2021-05-25 | 2023-01-13 | 上海三友医疗器械股份有限公司 | Pedicle screw extension assembly and method of use |
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| CN206214167U (en) * | 2016-03-22 | 2017-06-06 | 北京中安泰华科技有限公司 | A kind of backbone minimal invasion pedicle nail nail seat and extension piece draw bail |
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| CN110250300A (en) * | 2019-06-19 | 2019-09-20 | 安徽恨水茶业有限公司 | A kind of tea processing device of tea rolling |
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| US20160106480A1 (en) * | 2014-07-02 | 2016-04-21 | Yue Zhou | Extension piece at screw end of pedicle screw, dilator and push rod reset lever |
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| CN206214167U (en) * | 2016-03-22 | 2017-06-06 | 北京中安泰华科技有限公司 | A kind of backbone minimal invasion pedicle nail nail seat and extension piece draw bail |
| CN208375127U (en) * | 2018-06-26 | 2019-01-15 | 企鹅创新（北京）科技有限公司 | A kind of fixed angle bulb positioning device |
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| Publication number | Publication date |
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| CN112120774A (en) | 2020-12-25 |
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