CN201108490Y

CN201108490Y - Atlantoaxial back rout internal fixation machine

Info

Publication number: CN201108490Y
Application number: CNU2007200757661U
Authority: CN
Inventors: 倪斌; 王明飞
Original assignee: Second Military Medical University SMMU
Current assignee: Shanghai Tateng Medical Device Co.,Ltd.
Priority date: 2007-11-20
Filing date: 2007-11-20
Publication date: 2008-09-03
Anticipated expiration: 2017-11-20

Abstract

The utility model relates to the technical field of medical devices and discloses a posterior atlantoaxial internal fixator used for bone surgery; the fixator consists of an atlas posterior arch hook (1) and an atlantoaxial universal screw (2); the atlas posterior arch hook consists of two parts, namely a lamina hook (11) and a connecting rod (12); the atlantoaxial universal screw (2) consists of a screw (21), a screw cap (22) and a nut (23); the screw cap (22) is hollow with U-shaped grooves (25) on both sides; the connecting rod of the atlas posterior arch hook goes through the U-shaped grooves on the atlantoaxial universal screw cap, screws up the nut, so as to form the posterior atlantoaxial internal fixator. Because the atlas posterior arch hook and the atlantoaxial universal screw of the internal fixator are connected through connection of the connecting rod and the screw cap, three-point fixation is realized; therefore, the unstable atlantoaxial fixation is reliable, the fusion rate is improved, the surgical operation is simple and easy, the surgical risk is reduced and the surgical quality is improved.

Description

A kind of extensive region dentata way of escape inner fixer

Technical field

This utility model relates to technical field of medical instruments, is a kind of Orthopeadic Surgery extensive region dentata way of escape inner fixer.

Background technology

The articulatio atlantoepistrophica complex is positioned at cervical region, it is spinal motion zone the most flexibly, causing mechanical damage easily, also is the predilection site of diseases such as congenital malformation, tumor, tuberculosis, rheumatoid, and to cause spinal compression be the importance of spinal surgery treatment to the extensive region dentata shakiness due to thus.

Way of escape extensive region dentata fusion is to solve the unsteady main means of extensive region dentata, way of escape extensive region dentata fusion be with internal fixation method with the extensive region dentata of unstability after structure be fixed as one the way of final fusion with plant bone mass.Traditional internal fixation method has: tie up arch of posterior atlas and lamina of axis (Gallie technology and Brooks technology) with steel wire or titanium cable 1., but constant intensity is strong inadequately, belong at 2 and fix, fusion rate is low, and has the possibility of steel wire or titanium cable cutting vertebral plate Spinal Cord; 2. use the interlaminar clamp technique for fixing, the interlaminar clamp two ends are the vertebral plate hook, link up with respectively fixedly arch of posterior atlas and lamina of axis with vertebral plate, though avoided wearing under the vertebral plate sport technique segment of steel wire or titanium cable, but vertebral lamina hook may enter canalis spinalis and produce spinal compression, and belong to 2 fixing, constant intensity is also strong inadequately, fusion rate is lower; 3. fix through the joint space screw with the extensive region dentata, promptly pass dentata lateral mass joint, extensive region with screw and make it to be fixed in one, the method generally need be tied up to combine and be realized the purpose of rear bone-graft fusion with steel wire or titanium cable.Fix though the method belongs at 3, holder can't link into an integrated entity, and has reduced internal fixation intensity, and still has the possibility of steel wire or titanium cable cutting vertebral plate Spinal Cord; 4. with lateral mass of atlas screw and dentata LOCATION OF PEDICLE SCREW FIXATION method, the method has stronger biomechanical stability, but because the particularity on the dentata anatomy of extensive region, the operation technique difficulty is bigger, is difficult to extensive use.

At present the dentata method of tying up through joint space screw+steel wire or titanium cable in extensive region is used more clinically, it is fixing more firm to belong to bikini, but do not form one with existing inner fixer screw and steel wire or titanium cable, more loaded down with trivial details inconvenience in the operation, operating time is long, and surgical injury spinal cord equivalent risk is bigger, influence operation quality.

Summary of the invention

The purpose of this utility model provides the short and little extensive region dentata way of escape inner fixer of damage risk of a kind of fixed, easy to operate, operating time.

This utility model extensive region dentata way of escape inner fixer is made up of arch of posterior atlas hook and the universal screw of extensive region dentata.The arch of posterior atlas hook is made up of vertebral plate hook and pitman two parts, two parts are connected as a single entity, the vertebral plate hook is used to hook the arch of posterior atlas of unstability, the top of vertebral plate hook is provided with the prelum draw-in groove, be convenient to special-purpose prelum and block pressurization, pitman is used for being connected with the universal screw of extensive region dentata, thereby arch of posterior atlas hook and the universal screw of extensive region dentata are connected as a single entity; Dentata universal screw in extensive region is made up of nail body, the head of a nail and nut, head of a nail hollow, crown takes the form of inclined plane, 50 degree incisuras are arranged approximately, can make the nail body bigger mobility be arranged at the incisura face, head of a nail central authorities are provided with screw hole, the nail body is installed in it, head of a nail both sides are provided with the U-shaped groove, the pitman external diameter coupling of the width of U-shaped groove and arch of posterior atlas hook, and head of a nail inwall is provided with female thread, the external screw thread coupling of this female thread and nut, nut hollow, inner chamber cross section are hexagon or other shapes, and the interior hexagonal spiral shell cutter of available coupling or other revolve tool and are tightened in the head of a nail.Arch of posterior atlas hook and the universal set screws of extensive region dentata are fashionable, pitman with the arch of posterior atlas hook passes the U-shaped groove earlier, after special-purpose prelum is stuck in prelum draw-in groove pressurization on the hook, again nut is tightened in the head of a nail, just becomes this utility model extensive region dentata way of escape inner fixer.

During operation, earlier dentata universal screw in extensive region is passed the dentata lateral mass joint, extensive region of unstability, owing to, the head of a nail big through joint space screw angle become the angle big, and the crown of the head of a nail takes the form of inclined plane, 50 degree incisuras are arranged, can make the head of a nail still remain on the normal position and be convenient to the pitman of arch of posterior atlas hook and link to each other.Then according to the pitman part suitably bending of situation in the art with the arch of posterior atlas hook, vertebral plate with the arch of posterior atlas hook hooks arch of posterior atlas again, the pitman of arch of posterior atlas hook passes the U-shaped groove of the head of a nail to suitable length, by special-purpose prelum it is pressurizeed, screw the nut in the head of a nail at last, promptly reach fixedly purpose.

This utility model is simple in structure, easy to use, because this inner fixer arch of posterior atlas hook and the universal screw of extensive region dentata are connected as a single entity by the linking of the pitman and the head of a nail, realized the fixed purpose of bikini, therefore make the extensive region dentata of unstability fixed, fusion rate improves, and it is simple and easy to do that operation technique also becomes, reduce operation risk, improved the operation quality.

Description of drawings

Fig. 1 is the structural representation of arch of posterior atlas hook of the present utility model.

Fig. 2 is the structural representation of the universal screw nail body of extensive region of the present utility model dentata and the head of a nail.

Fig. 3 is the structural representation of the universal screw-nut of extensive region dentata of the present utility model.

The side-looking structural representation that Fig. 4 is connected with the universal screw of extensive region dentata for this utility model arch of posterior atlas hook.

The specific embodiment

Now in conjunction with the accompanying drawings and embodiments, this utility model is described in detail.

This utility model is made up of arch of posterior atlas hook 1 and the universal screw 2 of extensive region dentata.The arch of posterior atlas hook is made up of vertebral plate hook 11 and pitman 12 two parts, and two parts are connected as a single entity, and the top of vertebral plate hook 11 is provided with prelum draw-in groove 13, and arch of posterior atlas hook 1 is connected with the universal screw 2 of extensive region dentata by pitman 12; Dentata universal screw 2 in extensive region is made up of nail body 21, the head of a nail 22 and nut 23, head of a nail hollow, crown 24 is 50 degree inclined plane shapes, inclined-plane central authorities are provided with screw hole, the nail body just inserts in it, head of a nail both sides are provided with U-shaped groove 25, the external diameter coupling of the pitman 12 of the width of U-shaped groove and arch of posterior atlas hook, head of a nail inwall is provided with female thread, the external screw thread coupling of this female thread and nut 23, nut hollow, inner chamber cross section are hexagon or other shapes, and the interior hexagonal spiral shell cutter of available coupling or other revolve tool and are tightened in the head of a nail; The pitman of arch of posterior atlas hook is passed U-shaped groove on the universal screw head of a nail of extensive region dentata, again nut is screwed, extensive region dentata way of escape inner fixer.

Embodiment 1.

This utility model is made up of arch of posterior atlas hook and the universal screw of extensive region dentata, the long 54.7mm of pitman, and external diameter 3mm, vertebral plate hook internal diameter 2.8mm, wide 4.5mm, thick 1.5mm, the span between crotch top and the pitman is 62.3mm; The long 40mm of universal screw nail body, external diameter 3.5mm, head of a nail internal diameter 7.8mm, nut external diameter 7.8mm and its coupling.

Embodiment 2.

This utility model is made up of arch of posterior atlas hook and the universal screw of extensive region dentata, the long 24mm of universal screw nail body, and external diameter 3.5mm, all the other are with embodiment 1.

This utility model can be made different specifications and models as required.

Claims

1, a kind of extensive region dentata way of escape inner fixer, it is characterized in that forming by arch of posterior atlas hook (1) and the universal screw of extensive region dentata (2), the arch of posterior atlas hook is made up of vertebral plate hook (11) and pitman (12) two parts, two parts are connected as a single entity, the top of vertebral plate hook (11) is provided with prelum draw-in groove (13), and arch of posterior atlas hook (1) is connected with the universal screw of extensive region dentata (2) by pitman (12); The universal screw of extensive region dentata (2) is made up of nail body (21), the head of a nail (22) and nut (23), head of a nail hollow, crown (24) is 50 degree inclined plane shapes, inclined-plane central authorities are provided with screw hole, the nail body just inserts in it, head of a nail both sides are provided with U-shaped groove (25), the external diameter coupling of the pitman (12) of the width of U-shaped groove and arch of posterior atlas hook, head of a nail inwall is provided with female thread, the external screw thread coupling of this female thread and nut (23), nut hollow, inner chamber cross section are hexagon or other shapes, and the interior hexagonal spiral shell cutter of available coupling or other revolve tool and are tightened in the head of a nail; The pitman of arch of posterior atlas hook is passed U-shaped groove on the universal screw head of a nail of extensive region dentata, again nut is screwed, extensive region dentata way of escape inner fixer.