CN201108491Y

CN201108491Y - Atlantoaxial back rout internal fixation machine

Info

Publication number: CN201108491Y
Application number: CNU2007200757676U
Authority: CN
Inventors: 倪斌; 王明飞
Original assignee: Second Military Medical University SMMU
Current assignee: Second Military Medical University SMMU
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 with joint used for bone surgery; the fixator consists of an atlas posterior arch hook with joint (1) and an atlantoaxial universal screw (2); the atlas posterior arch hook (1) consists of three parts, namely a lamina hook (11), a regulating joint (12) and a connecting rod (13); the lamina hook (11) consists of a hook (111) and a rotary disk (112); 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 with joint 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 with joint. Because the atlas posterior arch hook with joint 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.

Description

A kind of articulated 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 with articulated 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 articulated 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 articulated arch of posterior atlas hook and the universal screw of extensive region dentata.Articulated arch of posterior atlas hook is made up of vertebral plate hook, adjusting joint and pitman three parts, vertebral plate hook by hook be connected rotating disk and form, the top of hook also is provided with the prelum draw-in groove, be convenient to special-purpose prelum and block pressurization, hook flexure plane one side that connects rotating disk is provided with anti-skidding concavo-convex with gear-like; Regulate the joint between vertebral plate hook and pitman, it is made up of rotating shaft and nut, and rotating shaft is provided with main shaft, and the main shaft external diameter is complementary with the rotating disk internal diameter that is connected of vertebral plate hook, and a side of rotating shaft is provided with the pitman hole, and opposite side is the spiral shell core that hold-doun nut is used; The pitman hole internal diameter coupling of pitman external diameter and rotating shaft, the stiff end fourth of the twelve Earthly Branches is with packing ring, in case deviate from, the stiff end outer wall of pitman is provided with vertical gear-like striped, with the interlock that is complementary of the tooth of hook rotating disk, is difficult for loosening so that be fixed in different angles.During assembling, pitman is inserted the pitman hole of rotating shaft, the hook rotating disk is enclosed within on the main shaft of rotating shaft, again spiro cap is screwed on the spiral shell core of rotating shaft, articulated arch of posterior atlas hook.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, 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 articulated 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, nut hollow, the inner chamber cross section is 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.Articulated 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, adjust the angle of articulated arch of posterior atlas hook, respectively with the Movable joint of arch of posterior atlas hook and the nut check of the universal screw of extensive region dentata, just become this utility model extensive region dentata way of escape inner fixer again.Because the crown of the head of a nail takes the form of inclined plane, 50 degree incisuras are arranged, it is bigger in incisura face range of activity for the head of a nail therefore to follow closely bulk phase, and maximum can reach 50 degree, satisfies, the head of a nail big through joint space screw angle and becomes the big needs in angle.During operation, dentata universal screw in extensive region is passed the dentata lateral mass joint, extensive region of unstability, vertebral plate with articulated arch of posterior atlas hook hooks arch of posterior atlas again, the pitman of articulated arch of posterior atlas hook passes the U-shaped groove of the head of a nail to suitable length, and regulate angle, after special-purpose prelum is stuck in prelum draw-in groove pressurization on the hook, screws the nut in the head of a nail and regulate the nut in joint, promptly reach fixedly purpose.For the situation of the screw head of a nail and arch of posterior atlas hook apart from each other on vertical, the angle of using band joint arch of posterior atlas hook can regulate articulated arch of posterior atlas hook makes that the vertebral plate hook is more appropriate effectively to hook loosening arch of posterior atlas.

This utility model is simple in structure, easy to use, because articulated arch of posterior atlas hook of this inner fixer 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 the articulated arch of posterior atlas hook of this utility model

Fig. 2 is the vertebral plate hook structure sketch map of the articulated arch of posterior atlas hook of this utility model

Fig. 3 is the adjusting articulation structure sketch map of the articulated arch of posterior atlas hook of this utility model

Fig. 4 is the nut structure sketch map of the articulated arch of posterior atlas hook of this utility model

Fig. 5 is the pitman structural representation of the articulated arch of posterior atlas hook of this utility model

Fig. 6 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. 7 is the structural representation of the universal screw-nut of extensive region dentata of the present utility model.

Fig. 8 is the side-looking structural representation that the articulated arch of posterior atlas hook of this utility model is connected with the universal screw of extensive region dentata.

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 articulated arch of posterior atlas hook 1 and the universal screw 2 of extensive region dentata.Arch of posterior atlas hook 1 is made up of vertebral plate hook 11, adjusting joint 12 and pitman 13 3 parts, vertebral plate hook 11 is made up of hook 111 and rotating disk 112, the top of hook 111 is provided with prelum draw-in groove 114, and hook flexure plane one side of rotating disk 112 is provided with anti-slop serrations colyliform concavo-convex 113; Regulate joint 12 between vertebral plate hook 11 and pitman 13, it is made up of rotating shaft 121 and nut 122, and rotating shaft is provided with main shaft 123, and a side of main shaft 123 is provided with pitman hole 124, and opposite side is a spiral shell core 125, and nut 122 is fixed in spiral shell core 125; The pitman hole 124 internal diameters coupling of pitman 13 external diameters and rotating shaft, pitman 13 stiff end external diameters then are slightly larger than pitman hole 124 internal diameters, and the stiff end outer wall of pitman 13 is provided with vertical gear-like striped 131; Pitman 13 is inserted the pitman hole 124 of rotating shafts, rotating disk 112 is enclosed within on the main shaft 123 of rotating shaft, again nut 122 is enclosed within on the spiral shell core 125 of rotating shaft and screws, articulated arch of posterior atlas hook.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, crown central authorities are provided with screw hole, nail body 21 just inserts in it, head of a nail both sides are provided with U-shaped groove 25, the pitman 13 external diameters coupling of the width of U-shaped groove and articulated 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 articulated arch of posterior atlas hook and the universal screw of extensive region dentata, regulate the joint vertebral plate hook and pitman are connected into articulated arch of posterior atlas hook, its vertebral plate hook internal diameter 2.8mm, wide 4.5mm, thick 1.5mm, the long 40mm of pitman, external diameter 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 articulated arch of posterior atlas hook and the universal screw of extensive region dentata, the long 38mm of pitman, and external diameter 3mm, the long 26mm of universal screw nail body, 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 articulated extensive region dentata way of escape inner fixer, it is characterized in that forming by articulated arch of posterior atlas hook (1) and the universal screw of extensive region dentata (2), articulated arch of posterior atlas hook (1) is made up of vertebral plate hook (11), adjusting joint (12) and pitman (13) three parts, vertebral plate hook (11) is made up of hook (111) and rotating disk (112), and the top of hook (111) is provided with prelum draw-in groove (114); One side of rotating disk (112) is provided with anti-slop serrations colyliform concavo-convex (113); Regulating joint (12) is positioned between vertebral plate hook (11) and the pitman (13), it is made up of rotating shaft (121) and nut (122), rotating shaft is provided with main shaft (123), one side of main shaft (123) is provided with pitman hole (124), opposite side is spiral shell core (125), and nut (122) is fixed in spiral shell core (125); Pitman hole (124) the internal diameter coupling of pitman (13) external diameter and rotating shaft, pitman (13) stiff end external diameter then is slightly larger than pitman hole (124) internal diameter, and the stiff end outer wall of pitman (13) is provided with vertical gear-like striped (131); Pitman (13) is inserted the pitman hole (124) of rotating shaft, rotating disk (112) is enclosed within on the main shaft (123) of rotating shaft, again nut (122) is enclosed within on the spiral shell core (125) of rotating shaft and screws, articulated arch of posterior atlas hook; 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, crown central authorities are provided with screw hole, nail body (21) just inserts in it, head of a nail both sides are provided with U-shaped groove (25), the external diameter coupling of the pitman (13) 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, articulated extensive region dentata way of escape inner fixer.