CN2907560Y

CN2907560Y - Intravertebral immobilizer with anti-expansion direction-changing screw

Info

Publication number: CN2907560Y
Application number: CN 200520000057
Authority: CN
Inventors: 于海鹰
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-05
Filing date: 2005-01-05
Publication date: 2007-06-06
Anticipated expiration: 2015-01-05

Abstract

This utility model relates to an internal fixation device for spine with a dilation-proofing bone screw. The utility model is characterized in that the utility model consists of a ball tub, a connecting jacket, an internal screw, a hinging gasket and a connective bar. The spherical head of the ball tub is positioned at the pivoting support terminal on the inner spherical surface in the connecting jacket. A threaded section of the ball tub is pull out of pivoting support terminal on the inner spherical surface in the connecting jacket. The connecting jacket is provided with the hinging gasket. One terminal surface of the inner spherical surface of the hinging gasket holds and clamps the spherical head of the ball tub, the other terminal surface is a semi-cylinder groove used to embed the connective bar. The internal screw presses the ball tub through the connective bar and the hinging gasket to fix the deflection angle of the ball tub. The internal fixation device for spine with a dilation-proofing bone screw has the features that the utility model is simple to be operated, the deflection angle of the ball tub is great and fixed reliably.

Description

Anti-Swelling Direction-Changing Screw Backbone Internal Fixer

Technical field

This utility model relates to a kind of Anti-Swelling Direction-Changing Screw Backbone Internal Fixer

Technical field

Injured or odd-shaped human body spinal column is implemented to reset with operation process such as rectifications in, the screw of spinal column internal fixation device and the angle between the pitman and mutual alignment will constantly change with the process of performing the operation.In the past have fixed axis to screw in use doctor's operation is made troubles and also influences simultaneously final result of use, but also there are some kinds of spinal column internal fixation devices to use the break-in screw, but owing to the reason of junction structural design makes that volume is bigger than normal or postoperative is easily loosening, and influence the inspection of postoperative nuclear-magnetism, its effect is still not ideal enough.

Summary of the invention

The purpose of this utility model is to provide a kind of spinal column internal fixation device for overcoming above-mentioned defective, the ball screw of this spinal column internal fixation device in operation and the angle between adapter sleeve and the pitman can be with adjusting in being intended in a big way, adopt the inner bolt pressing mode to make the connecting portion volume significantly reduce in the time of fixedly, but fastening force also is not less than inside and outside coupling mechanism force, can prevent the generation that postoperative is loosening effectively.

Realize the technical scheme of above-mentioned purpose, this utility model Anti-Swelling Direction-Changing Screw Backbone Internal Fixer is by ball screw, adapter sleeve, inner bolt, hinged packing ring and pitman are formed, the threaded portion of ball screw passes adapter sleeve, its ballhead then closely cooperates with sphere pivoting support end in adapter sleeve, hinged packing ring pack into so that the recessed Internal Spherical Surface end face of hinged packing ring at the other end of ballhead, ballhead and the common globular hinge slew gear of forming of adapter sleeve Internal Spherical Surface revolution support end, the hinged packing ring other end is that semi-cylindrical groove and adapter sleeve one end have a U type groove in order to embed pitman, after screwing in the adapter sleeve, inner bolt can exert pressure then pressure through pitman to pitman, hinged packing ring is passed to ball screw and ballhead and adapter sleeve Internal Spherical Surface pivoting support end is compressed, and pitman and adapter sleeve is closely fixing.

This utility model compared with prior art, the connecting portion compact conformation, volume is less, screw implant angle adjustable range is big, and is easy and simple to handle, fixing reliable.

Description of drawings

Fig. 1 is this utility model embodiment sketch map.

Fig. 2 is this utility model ball screw sketch map.

Fig. 3 is this utility model adapter sleeve sketch map.

Fig. 4 is this utility model inner bolt sketch map.

Fig. 5 is the hinged packing ring sketch map of this utility model.

Fig. 6 is this utility model pitman sketch map.

Fig. 7 is this utility model assembling sketch map.

Fig. 8 is this utility model form of thread sketch map.

The specific embodiment

Below in conjunction with accompanying drawing specific embodiment of the utility model is described in further details.

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, this utility model Anti-Swelling Direction-Changing Screw Backbone Internal Fixer is made up of ball screw (1), adapter sleeve (2), inner bolt (3), hinged packing ring (4) and pitman (5).

As shown in Figure 2, the planform before ball screw (1) assembling.As shown in Figure 3, the planform before adapter sleeve (2) assembling.As shown in Figure 4, the planform before inner bolt (3) assembling.As shown in Figure 5, the planform before the assembling.As shown in Figure 6, the planform before pitman (5) assembling.As Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, shown in Figure 7, adapter sleeve (2) is a hollow sleeve, its diameter of bore is slightly larger than the ballhead diameter of ball screw (1), the two ends function of adapter sleeve (2) is different with structure, wherein an end is an Internal Spherical Surface pivoting support end, the outlet diameter of this end is less than the ballhead diameter of ball screw (1) but greater than its major diameter of thread, the inboard of Internal Spherical Surface pivoting support end is an Internal Spherical Surface pivoting support structure, the ballhead diameter of this Internal Spherical Surface diameter and ball screw (1) is complementary, the other end of adapter sleeve (2) is the fastening end, the fastening end is provided with female thread and screws into inner bolt (3), also has a U type groove for embedding pitman (5) in the fastening end along axis direction.Hinged packing ring (4) diameter is slightly less than adapter sleeve (2) diameter of bore, hinged packing ring (4) one ends are recessed Internal Spherical Surface structure, the ballhead diameter of its Internal Spherical Surface diameter and ball screw (1) is complementary, the other end of hinged packing ring (4) has a semi-cylindrical groove so that pitman (5) embeds, and hinged packing ring (4) also is provided with a central through hole and can passes smoothly for screwing used screw driver of ball screw (1) or spanner.As Fig. 1, shown in Figure 7, this utility model Turning screw spinal internal fixator at first penetrates the fastening end of ball screw (1) by adapter sleeve (2) when assembling, and the threaded portion of ball screw (1) is pushed down the ballhead of ball screw (1) by the endosphere type end side of the hinged packing ring of adapter sleeve (2) (4).At first pass hinged packing ring (4) with in ball screw (1) implantable bone during clinical use with screw driver or spanner, pitman (5) is embedded and is pressed in the semi-cylindrical groove of hinged packing ring (4) from adapter sleeve (2) fastening end U type groove, then inner bolt (3) is screwed in along inner bolt from adapter sleeve (2) fastening end, treat the angle between adapter sleeve (2) and the ball screw (1) is mixed up and inner bolt (3) can be screwed, pitman this moment (5) passes to hinged packing ring (4) so that the ballhead of ball screw (1) is fixed with the pressure of inner bolt (3), makes its firm stable more.

As shown in Figure 8, the screw thread pressure angle of the part that is threaded of adapter sleeve (2) and inner bolt (3) adopts 80 °-95 °, its effect is when exerting pressure for inner bolt (3), the U type groove of adapter sleeve (2), can not exert pressure because of inner bolt (3) causes U type groove two arms to occur to the phenomenon of turning up, and causes inner bolt (3) pitman (5) can not be pushed firmly.

Claims

1 one kinds of Anti-Swelling Direction-Changing Screw Backbone Internal Fixers, it is characterized in that it is by ball screw (1), adapter sleeve (2), inner bolt (3), hinged packing ring (4) and pitman (5) are formed, be used in the implantable bone beyond the Internal Spherical Surface pivoting support end end face in the ballhead adapter sleeve (2) of ball screw (1), hinged packing ring (4) is housed in adapter sleeve (2), the U type groove of adapter sleeve (2) is embedded in pitman (5), inner bolt (3) screws in and compresses pitman (5) along the female thread of adapter sleeve (2) fastening end, inner bolt (3) screws in and compresses pitman (5) along the female thread of adapter sleeve (2) fastening end, pitman (5) is passed to the ballhead of ball screw (1) so that ball screw (1) is fixing and keep its implant angle with the pressure of inner bolt (3) through hinged packing ring (4), inner bolt (3) is threaded into along adapter sleeve (2) U type channel opening place, further pitman (5) is exerted pressure, guarantee that pitman (5) is more firm.

2 Anti-Swelling Direction-Changing Screw Backbone Internal Fixers according to claim 1, the head of screw that it is characterized in that ball screw (1) is a spherical structure, its land portions is greater than hemisphere.

3 Anti-Swelling Direction-Changing Screw Backbone Internal Fixers according to claim 1, it is characterized in that adapter sleeve (2) is a hollow sleeve, its diameter of bore is slightly larger than the ballhead diameter of ball screw (1), the two ends function of adapter sleeve (2) is different with structure, wherein an end is an Internal Spherical Surface pivoting support end, the outlet diameter of this end is less than the ballhead diameter of ball screw (1) but greater than its major diameter of thread, the inboard of Internal Spherical Surface pivoting support end is an Internal Spherical Surface supporting structure, the ballhead diameter of this Internal Spherical Surface diameter and ball screw (1) is complementary, the other end of adapter sleeve (2) is the fastening end, the fastening end is provided with female thread and screws in inner bolt (3), also has a U type groove for the usefulness that embeds pitman (6) in the fastening end along axis direction.

4 Anti-Swelling Direction-Changing Screw Backbone Internal Fixers according to claim 1, it is characterized in that hinged packing ring (4) one ends are recessed Internal Spherical Surface structure, the ballhead diameter of its Internal Spherical Surface diameter and ball screw (1) is complementary, the other end of hinged packing ring (4) is a semi-cylindrical groove structure, this semi-cylindrical groove can match with pitman (5), and hinged packing ring (4) also is provided with a central through hole and can passes smoothly for screwing used screw driver of ball screw (1) or spanner.

5 Anti-Swelling Direction-Changing Screw Backbone Internal Fixers according to claim 1, it is characterized in that after ball screw (1), adapter sleeve (2) and hinged packing ring (4) fit together the Internal Spherical Surface pivoting support end of the ballhead of ball screw (1), adapter sleeve (2) and the recessed Internal Spherical Surface end of hinged packing ring (4) are combined into a globular hinge revolving structure has enough implant angle excursions to guarantee ball screw (1).

6 Anti-Swelling Direction-Changing Screw Backbone Internal Fixers according to claim 1 is characterized in that adapter sleeve (2) is connected the form of thread of usefulness with inner bolt (3).