A kind of pedicle nail that can prevent nail seat distendingTechnical field
The invention belongs to technical field of medical instruments, be specifically related to a kind of pedicle nail that can prevent nail seat distending.
Background technology
At present, both at home and abroad in Via Posterior Spinal Approach internal fixation operation, capital uses the internal fixtion that pedicle nail and pitman carry out Via Posterior Spinal Approach, there has been proposed as publication number: 101803944A " a kind of pedicle nail ", publication number: 10206803A " a kind of pedicle nail ", notification number: 101732086A " pedicle nail with orthopedic ", notification number: 201996649U " a kind of novel pedicle nail " etc. are about the technical scheme of " pedicle nail " for this reason.And be all adopt " lock nut " or claim " clamp nut " to be fixed connection between pedicle nail and pitman, because operation needs, pedicle nail nail seat adopts the design of open-top screw thread and U-type groove, after lock nut to coordinate with pedicle nail and locks pitman, because pitman also can produce counteracting force to the nail seat of lock nut and pedicle nail while being subject to lock nut thrust, nail seat its wall under the effect of counteracting force will expand distending, result causes the contact area of the screw thread of both lock nut and nail seat to reduce, lock nut locking pitman poor effect is caused directly to cause the appearance of lock nut stripped thread phenomenon.In addition, the lower portion of nail seat is rivet nut below it, is U-type groove, so stress is herein concentrated especially above it; And in operation process, rivet nut very long below will screw in spinal column, screwed hole above can be subject to it with the extruding of the lock nut engaged, so the power be subject to is also very concentrated herein, because above-described factors, the lower portion of nail seat is easy to distortion and even damages.But it is all described above about not overcoming the technical scheme of above-mentioned disadvantage in the prior art of " pedicle nail ".
Summary of the invention
The object of the invention is for prior art exist disadvantage, a kind of pedicle nail that can prevent nail seat distending is provided, it can effectively prevent nail seat when be subject to pitman counteracting force, lock nut thrust its wall expand distending; Eliminate the hidden danger that lower portion stress is concentrated especially, stressed very concentrated brought easy distortion even damages of nail seat.
Above-mentioned goal of the invention is achieved through the following technical solutions:
A kind of pedicle nail that can prevent nail seat distending, the nail seat comprising rivet nut and be connected with rivet nut, described nail seat is provided with the U-type groove and screwed hole that connect pitman, screwed hole is meshed with a lock nut locking pitman, and its main points are that nail seat outer wall is set with the anti-expansion set preventing nail seat from expanding distending.
As preferably, two sides of described anti-expansion set symmetry are provided with pitman can through the arc groove coincide with U-type groove in nail seat, and it is set in nail seat pitman and passes and the lower portion locked.
As preferably, lock nut top is provided with anti-back sheet, and anti-back sheet two side is stretched out U-type groove part and is placed in anti-expansion set top.
The present invention prevents nail seat from expanding the anti-expansion set of distending because nail seat outer wall is set with, thus makes the outer wall of nail seat obtain reinforcing, it can effectively prevent nail seat when be subject to pitman counteracting force, lock nut thrust its wall expand distending; Eliminate the hidden danger that lower portion stress is concentrated especially, stressed very concentrated brought easy distortion even damages of nail seat; In addition, lock nut top is provided with anti-back sheet, anti-back sheet two side is stretched out U-type groove part and is placed in anti-expansion set top, operation consent anti-back sheet 9 uses laser weld at anti-expansion set (7) top, in operation, the anti-expansion set 7 of band anti-back sheet 9 is set in the lower portion of nail seat 2, thus can permanently prevents from lock nut from loosening moving; Further, its structure is simple, volume is little, uses easy to operate in operation, and the manufacturing cost increased is also very limited, so easily promote.
Accompanying drawing explanation
Fig. 1: structural representation of the present invention
The axonometric chart of Fig. 2: Fig. 1
Fig. 3: using state figure of the present invention
In Fig. 1-3,1-rivet nut, 2-nail seat, 3-pitman, 4-U type groove, 5-screwed hole, 6-lock nut, the anti-expansion set of 7-, 8-arc groove, 9-anti-back sheet.
Detailed description of the invention
Just Fig. 1--the invention will be further described for the embodiment face represented by 3 below.
The nail seat 2 that it comprises rivet nut 1 and is connected with rivet nut 1, described nail seat 2 is provided with the U-type groove 4 and screwed hole 5 that connect pitman 3, the lock nut 6 that screwed hole 5 and locks pitman 3 is meshed, and nail seat 1 outer wall is set with the anti-expansion set 7 preventing nail seat 1 from expanding distending; Two sides of described anti-expansion set 7 symmetry are provided with pitman 3 can through the arc groove 8 identical with U-type groove in nail seat 14, and it is set in nail seat 2 pitman 3 and passes and the lower portion locked; Lock nut 6 top is provided with anti-back sheet 9, and anti-back sheet 9 two side is stretched out U-type groove 4 part and is placed in anti-expansion set 7 top.
The use operation of the present embodiment is as follows: first screw in spinal column by the rivet nut 1 of two " a kind of can prevent the pedicle nail of nail seat distending ", by the U-type groove 4 of pitman 3 through two nail seats 2, then lock nut 6 is along screwed hole 5 toward backspin, until pitman 3 compact lock is fixed in U-type groove 4, then operation consent anti-back sheet 9 has been set in the lower portion of nail seat 2 at the anti-expansion set 7 at anti-expansion set 7 top by laser weld, anti-expansion set 7 can prevent from lock nut 6 from loosening moving.