Structure for connecting pedicle screw and extension pieceTechnical Field
The invention relates to the technical field of medical instruments, in particular to a structure for connecting pedicle screws and extension pieces.
Background
Pedicle screws and extension sheets can be used in the internal fixation technology of the vertebral column, and Chinese patent application number is: CN201210448575.0 discloses a structure for connecting pedicle screws and extension pieces in the prior art; in the patent, the side wall of a U-shaped groove of the pedicle screw tail is provided with an axial boss and a transverse boss, and a clamping hole for clamping the transverse boss of the pedicle screw tail is formed in a sheet body at one end of an extension sheet; in addition, the end of the extension piece is also provided with a flexible blocking strip which is arranged opposite to the clamping hole, and the flexible blocking strip and two sides of the extension piece form a clamping ring for clamping the axial boss of the tail of the pedicle screw. The two sides of one end of the extension piece, which is provided with the clamping hole, can be provided with supporting walls, and the flexible barrier strip and the two supporting walls form a clamping ring. Firstly, the extension piece is inclined by a certain angle, the axial boss can be inserted into the clamping hole of the extension piece, then, the extension piece is overturned outwards to enable the extension piece to be axially parallel to the pedicle screw, in the overturning process, due to the elastic and bendable characteristics of the extension piece, certain elastic deformation can be generated in the overturning process, the transverse boss is finally clamped into the clamping hole, and the axial boss is finally inserted into the clamping ring. By adopting the structure in the patent, the connection between the pedicle screw and the extension piece is easy to deviate.
Disclosure of Invention
In view of the above-described drawbacks of the prior art, the present invention solves the technical problem of providing a structure for connecting pedicle screws and extension pieces.
To achieve the above and other related objects, the present invention provides a structure for connecting pedicle screws and extension pieces, wherein lateral bosses are provided on the outer side walls of the tail U-shaped grooves of the pedicle screws, and the lateral bosses are connected with the lower ends of an axial boss; the upper end of the axial boss is provided with a positioning boss; the outer side surface of the axial boss is positioned outside the outer side surface of the positioning boss;
The two sides of the extension piece extend towards the direction close to the pedicle screw to form supporting walls, one sides of the two supporting walls close to the pedicle screw are connected through a baffle strip, the upper surface of the baffle strip and the two supporting walls enclose an upper hole part, and the lower surface of the baffle strip and the two supporting walls enclose a lower hole part; the barrier strip, the two supporting walls and the extension piece enclose a containing cavity; a sheet body clamping hole is formed in the extension sheet and communicated with the accommodating cavity; the upper hole part and the lower hole part are communicated with the accommodating cavity, the upper surface of the barrier strip is positioned below the hole top surface of the sheet body clamping hole, and the lower surface of the barrier strip is positioned above the hole bottom surface of the sheet body clamping hole;
The positioning boss penetrates into the accommodating cavity through the lower hole part, and the positioning boss is contacted with the side surface, close to the barrier strip, of the extension piece; the axial boss is clamped in the sheet clamping hole.
Preferably, the top surface of the positioning boss is an inclined surface, the top surface of the positioning boss is arranged in an upward inclined mode, and the top surface of the positioning boss is arranged in an inward inclined mode.
Further, protruding portions are arranged at intervals on the inner side of the top surface of the positioning boss, and the inner surface of each protruding portion is arc-shaped.
Preferably, two of said support walls are at the bottom of said extension piece.
Preferably, the extension sheet is a flexible extension sheet.
As described above, the structure for connecting pedicle screw and extension piece of the present invention has the following advantageous effects:
The positioning boss on the pedicle screw passes through the lower hole part and bypasses the barrier strip after penetrating into the accommodating cavity to contact with the side surface of the extension piece, which is close to the barrier strip; the axial boss is clamped in the sheet clamping hole, and the positioning boss is positioned in the accommodating cavity, so that the structure can ensure that the pedicle screw and the extension piece are firmly connected after being installed and cannot be separated.
Drawings
Fig. 1 is a schematic view showing a structure in which a positioning boss of the pedicle screw of the embodiment penetrates into a receiving cavity through a lower hole portion.
Fig. 2 is a schematic view showing the structure of the pedicle screw of the present embodiment after being connected with the extension piece.
Fig. 3 is a schematic view showing the inner side structure of the extension piece of the present embodiment.
Fig. 4 is a schematic view showing the outer structure of the extension piece of the present embodiment.
Fig. 5 shows a schematic structural view of the pedicle screw of the present embodiment.
Fig. 6 is an enlarged schematic view of the structure at a in fig. 5.
Description of the reference numerals
100. Pedicle screw
110. Transverse boss
120. Axial boss
121. Outer side surface of axial boss
130. Positioning boss
131. Outer side surface of positioning boss
132. Top surface of positioning boss
1321. The inner side of the top surface of the positioning boss
140. Raised portion
200. Extension piece
210. Supporting wall
220. Barrier strip
221. Upper surface of the barrier strip
222. Lower surface of the barrier strip
230. Upper hole part
240. Lower hole part
250. Accommodating chamber
260. Sheet clamping hole
261. Hole top surface of sheet body clamping hole
262. Hole bottom surface of sheet body clamping hole
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms "upper," "lower," "left," "right," "middle," "distal," "proximal," and "a" are used herein for descriptive purposes only and not for purposes of limitation, as the invention may be practiced without substantially altering the technology context.
As shown in fig. 1 to 6, the structure for connecting the pedicle screw 100 and the extension piece 200 of the present embodiment has a transverse boss 110 on the outer sidewall of the tail U-shaped slot of the pedicle screw 100, the transverse boss 110 being connected to the lower end of an axial boss 120; the upper end of the axial boss 120 is provided with a positioning boss 130; the outer side 121 of the axial boss 120 is outboard of the outer side 131 of the locating boss 130;
The two sides of the extension piece 200 extend towards the direction approaching the pedicle screw 100 to form support walls 210, one side of the two support walls 210 approaching the pedicle screw 100 is connected through a baffle strip 220, an upper surface 221 of the baffle strip 220 and the two support walls 210 enclose an upper hole part 230, and a lower surface 222 of the baffle strip 220 and the two support walls 210 enclose a lower hole part 240; the barrier rib 220, the two support walls 210 and the extension piece 200 enclose a receiving cavity 250; the extension piece 200 is provided with a piece clamping hole 260, and the piece clamping hole 260 is communicated with the accommodating cavity 250; the upper hole 230 and the lower hole 240 are communicated with the accommodating cavity 250, the upper surface 221 of the barrier strip 220 is positioned below the hole top surface 261 of the sheet body clamping hole 260, and the lower surface 222 of the barrier strip 220 is positioned above the hole bottom surface 262 of the sheet body clamping hole 260;
The positioning boss 130 penetrates into the accommodating cavity 250 through the lower hole portion 240, and the positioning boss 130 contacts with the side surface of the extension piece 200, which is close to the barrier rib 220; the axial boss 120 is snapped into the wafer snap hole 260.
The positioning boss 130 of the pedicle screw 100 passes through the lower hole 240, passes through the accommodating cavity 250, bypasses the barrier strip 220, and contacts with the side surface of the extension piece 200, which is close to the barrier strip 220; the axial boss 120 is caught in the sheet body catching hole 260 and the positioning boss 130 is positioned in the receiving cavity 250, and the structure of the present invention can ensure that the pedicle screw 100 and the extension sheet 200 are stably connected without being separated after being mounted.
When the invention is used, the positioning boss 130 penetrates into the accommodating cavity 250 through the lower hole part 240, bypasses the baffle strip 220 and penetrates out of the upper hole part 230, the extension piece 200 is broken outwards, the bottom end of the extension piece 200 moves towards the pedicle screw 100, the extension piece 200 is pushed downwards at the same time, the axial boss 120 is clamped into the sheet body clamping hole 260, and the positioning boss 130 is clamped into the accommodating cavity 250, namely the extension piece 200 is clamped with the pedicle screw 100.
The upper surface 221 of the barrier rib 220 and the two support walls 210 enclose an upper hole 230, the lower surface 222 of the barrier rib 220 and the two support walls 210 enclose a lower hole 240, the lower hole 240 is used for the positioning boss 130 to penetrate, and the upper hole 230 is used for the positioning boss 130 bypassing the barrier rib 220 to penetrate.
The upper surface 221 of the barrier rib 220 is below the top surface 261 of the blade engagement hole 260, and the lower surface 222 of the barrier rib 220 is above the bottom surface 262 of the blade engagement hole 260, which facilitates engagement of the axial boss 120 into the blade engagement hole 260.
The top surface 132 of the positioning boss 130 is an inclined surface, the top surface 132 of the positioning boss 130 is arranged in an upward inclined manner, and the top surface 132 of the positioning boss 130 is arranged in an inward inclined manner. The inclined surface has guiding function in the process of sleeving the extension piece 200 into the positioning boss 130, so that the extension piece 200 can be ensured to be smoothly sleeved into the positioning boss 130 of the pedicle screw 100, namely, the positioning boss 130 can conveniently pass through the lower hole part 240, penetrate into the accommodating cavity 250, and bypass the moving path of the barrier strip 220 penetrating out of the upper hole part 230.
Because the extension piece 200 may have an interference when processing, the inner side 1321 of the top surface 132 of the positioning boss 130 is provided with the convex portions 140 arranged at intervals, the inner surface of the convex portion 140 is arc-shaped, and the arc-shaped inner surface can facilitate the relative movement between the extension piece 200 and the positioning boss 130 of the pedicle screw 100 when the extension piece 200 is processed and deviated, thereby being beneficial to rapidly completing the installation.
Two support walls 210 are at the bottom of the extension piece 200. This structure makes the structure more compact.
The extension tab 200 is a flexible extension tab 200 to facilitate the installation of the extension tab 200 with the pedicle screw 100.
In conclusion, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.