CN201139627Y

CN201139627Y - Atlantoaxial posterior nail stick internal fixation device

Info

Publication number: CN201139627Y
Application number: CNU2007200758471U
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: 2007-11-22
Filing date: 2007-11-22
Publication date: 2008-10-29
Anticipated expiration: 2017-11-22

Abstract

The utility model relates to the medical appliance technical field, in particular to an atlantoaxial posterior surgery pedicle screw/rod internal fixator used in an orthopedic surgery. The internal fixator consists of a common atlantoaxial universal bolt (1), an atlantoaxial universal lifting bolt (2) and a connecting stick (3), wherein, the common atlantoaxial universal bolt (1) consists of a bolt body (11), a bolt cap (12) and a nut (13); a bolt cap (22) of the atlantoaxial universal lifting bolt (2) is longer than the bolt cap (12) of the common atlantoaxial universal bolt (1), the middle part of the outer surface is provided with a waist-shaped V-shaped concave place (26), the rear part of the concave place is provided with a cap wing (25); the two sides of the bolt caps of the two atlantoaxial universal bolts are respectively provided with two U-shaped concave grooves (14) or (24), the width of the concave groove is matched with the outside diameter of the connecting stick (3), the two atlantoaxial universal bolts are fixed on the connecting stick by a nut through the U-shaped concave grooves of the bolt caps, thereby forming the atlantoaxial posterior surgery pedicle screw/rod internal fixator. The atlantoaxial posterior surgery pedicle screw/rod internal fixator has the functions of lifting and reposition in the operation, realizes the three-point type fixation, ensures that the instable atlantoaxial is fixed firmly, improves the fusion rate, and makes the operation convenient and easy to be implemented.

Description

Traffic stud rod inner fixer behind the dentata of a kind of extensive region

Technical field

This utility model relates to technical field of medical instruments, be a kind of Orthopeadic Surgery with extensive region dentata with reset function after traffic stud rod inner fixer.

Background technology

Reasons such as transverse ligament of atlas fracture and fracture of odontoid process of vertebra dentata can cause loss of stability between the dentata of extensive region, and atlas shifts forward, and also claims anterior dislocation.Along with the prolongation of the state of an illness, the degree of atlas anterior displacement increases the weight of, and dentata lateral mass articular surface distortion in extensive region is tilted to the front lower place, and the soft tissue contracture of dentata front, extensive region even calcification make atlas fixing on the position of anterior dislocation, form the irreducible atlantoaxial dislocation.At present the more satisfactory scheme of treatment irreducible atlantoaxial dislocation is that the extensive region dentata loosens after resetting that row is fixing again, promptly earlier through oropharynx approach loosen the contracture spot or the calcified tissue in dentata the place ahead, extensive region, carry out skull traction then the extensive region dentata is resetted, again from the fixing and bone-graft fusion between the dentata of row extensive region, rear.But after loosening and reset, the extensive region dentata still have powerful retraction force that it is dislocated again, this case that just makes loosen reset after once more the dislocation, the extensive region dentata way of escape that is not suitable for carrying out short segment is fixed and bone-graft fusion, can only go fixing fusion of pillow neck of long segment, and the pillow neck of long segment fixedly the fusion wound is bigger, the movable basic forfeiture of postoperative pillow cervical region, patient's functional rehabilitation is very dissatisfied.

Existing extensive region dentata way of escape 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, can not effectively stop atlas to the front lower place slippage, postoperative dislocation recurrence rate height, and exist steel wire or titanium cable to cut the possibility of 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, belonging at 2 fixes, its constant intensity still stops atlas to be dislocated to the front lower place inadequately, though avoided wearing under the vertebral plate sport technique segment of steel wire or titanium cable, vertebral lamina hook may enter canalis spinalis and produce spinal compression; 3. fix through the joint space screw with the extensive region dentata, promptly pass dentata lateral mass joint, extensive region and make it to be fixed in one with screw, the method generally need be used under the situation that the extensive region dentata resets fully, and need tie up to combine with steel wire or titanium cable and realize the purpose of rear bone-graft fusion, but be suitable for the irreducible atlantoaxial dislocation; 4. with lateral mass of atlas screw and dentata LOCATION OF PEDICLE SCREW FIXATION method, the method has stronger biomechanical stability, but present inner fixer can only be fixed in the position on, can't use for the irreducible atlantoaxial dislocation situation that occurs displacement after resetting once more of loosening.

Lateral mass of atlas screw and dentata LOCATION OF PEDICLE SCREW FIXATION method biomechanical stability are stronger at present, it is fixing more firm to belong to bikini, but only can be at original fixed-site extensive region dentata with existing inner fixer screw, can't be in art the extensive region dentata of dislocation be lifted and reset, the extensive region dentata that causes some cases can't carry out short segment is fixed, merge and the pillow neck that is forced to the row long segment is fixing, the overwhelming majority pillow neck mobility that the patient is lost, surgical effect is dissatisfied.Need a kind of easy and simple to handle, safety in the clinical practice, fixed, have the extensive region dentata inner fixer that lifts reset function in the art again.

Summary of the invention

The purpose of this utility model provides a kind of traffic stud rod inner fixer behind the extensive region dentata that lifts reset function in the art that has.

Traffic stud rod inner fixer lifts screw and pitman is formed by the universal screw of common extensive region dentata, extensive region dentata are universal behind the dentata of this utility model extensive region.Dentata universal screw in common extensive region is made up of nail body, the head of a nail and nut, head of a nail hollow, crown central authorities are provided with screw hole, the nail body is installed in it, and head of a nail both sides are provided with the U-shaped groove, 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.The dentata universal screw structure that lifts in extensive region is basic identical with the common extensive region universal screw of dentata, also form by nail body, the head of a nail and nut, just the head of a nail is longer, the twice that is about the universal screw head of a nail of common extensive region dentata length, be provided with waist shape V-arrangement depression in the middle of its outer surface, the prolongation at its rear is called ear-flap, ear-flap only lifts in art when resetting and uses, promptly use aid that ear-flap is fractureed in case reset after fixing, the extensive region dentata is universal to lift screw and fractures and just be consistent with the common extensive region universal screw of dentata behind the ear-flap.Pitman is used to be connected and fixed universal screw of common extensive region dentata and the universal screw that lifts of extensive region dentata, the U-shaped recess width coupling of its external diameter and two kinds of screw heads of a nail.Pitman is inserted in the universal U-shaped groove that lifts the screw head of a nail of the universal screw of extensive region dentata and extensive region dentata, then respectively with nut locking, this utility model inner fixer that just becomes one.

During operation, earlier the common extensive region universal screw of dentata is screwed into the dentata pedicle of vertebral arch, lift the lateral mass that screw is screwed into the atlas of dislocation with the extensive region dentata is universal, again pitman is passed the U-shaped groove of two pieces of screw heads of a nail, with nut universal screw of common extensive region dentata on the dentata and pitman are locked earlier, again nut is screwed in from the universal ear-flap that lifts screw head of a nail rear of extensive region dentata gradually, because stopping of pitman, the head of a nail moves from front to back with the screw-in of nut, make and be fixed in the universal atlas that lifts on the screw nail body of extensive region dentata and lift backward together, after resetting,, ear-flap is fractureed abandon it at last, promptly finish Atlantoaxial the resetting of dislocating with fixing with nut check.

This utility model is simple in structure, easy to use, because this inner fixer has and lifts reset function in the art, do not need in advance the extensive region dentata is fully resetted, can realize the fixing of short segment when therefore irreducible atlantoaxial dislocation case being implemented reattachment surgery, kept patient's pillow cervical region mobility to greatest extent, and realized that bikini fixes, made the extensive region dentata of unstability fixed, fusion rate improves, it is simple and easy to do that operation technique also becomes, and reduced operation risk, improved the operation quality.

Description of drawings

Fig. 1 is the structural representation of the universal screw of common extensive region dentata of the present utility model.

Fig. 2 is the universal structural representation that lifts screw of extensive region of the present utility model dentata.

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

Fig. 4 is the structural representation of pitman of the present utility model.

Fig. 5 lifts preceding overall structure sketch map for this utility model.

Fig. 6 finishes overall structure sketch map after lifting for this utility model.

The specific embodiment

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

Traffic stud rod inner fixer lifts screw 2 and pitman 3 is formed by the universal screw 1 of common extensive region dentata, extensive region dentata are universal behind the dentata of this utility model extensive region.Dentata universal screw 1 in common extensive region is made up of nail body 11, the head of a nail 12 and nut 13, the head of a nail 12 hollows, crown central authorities are provided with screw hole, nail body 11 is installed in it, and head of a nail both sides are provided with U-shaped groove 14, and head of a nail inwall is provided with female thread, the external screw thread coupling of this female thread and nut 13, nut 13 hollows, 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 12.The extensive region dentata is universal, and to lift the universal screw of screw 2 structures and common extensive region dentata 1 basic identical, form by nail body 21, the head of a nail 22, nut 23, just the head of a nail 22 is longer, the twice that is about the universal screw head of a nail 12 length of common extensive region dentata, be provided with waist shape V-arrangement depression 26 in the middle of its outer surface, the prolongation at its rear is an ear-flap 25, ear-flap 25 only lifts in art when resetting and uses, promptly use aid that ear-flap 25 is fractureed in case reset after fixing, the extensive region dentata is universal to lift screw 2 ear-flap 25 backs that fracture and just is consistent with the universal screw 1 of common extensive region dentata.Pitman 3 is used to be connected and fixed universal screw 1 of common extensive region dentata and the universal screw 2 that lifts of extensive region dentata, the U-shaped groove 14 of its external diameter and two kinds of screw heads of a nail or 24 width coupling.

During use, earlier dentata universal screw 1 in common extensive region is screwed into the dentata pedicle of vertebral arch, lift the lateral mass that screw 2 is screwed into the atlas of dislocation with the extensive region dentata is universal, again pitman 3 is passed the U-lag 14 and 24 of two pieces of screw heads of a nail, with nut 13 universal screw 1 of the common extensive region dentata on the dentata and pitman 3 are locked earlier, again nut 23 is screwed in from the universal ear-flap 25 that lifts the head of a nail 22 rears of screw 2 of extensive region dentata gradually, because stopping of pitman 3, the head of a nail 22 moves from front to back with the screw-in of nut 23, the atlas that is fixed on the universal nail body 21 that lifts screw 2 of extensive region dentata is lifted together backward, after resetting, nut 23 is locked, at last ear-flap 25 is fractureed and abandons it, traffic stud rod inner fixer behind the dentata of this utility model extensive region.

Embodiment 1.

This utility model is made up of universal screw of common extensive region dentata and the universal screw that lifts of extensive region dentata, the long 24mm of the universal screw nail body of common extensive region dentata, external diameter 3.5mm, head of a nail internal diameter 7.8mm, nut external diameter and its coupling; The extensive region dentata is universal to lift the long 16mm of screw nail body, external diameter 3.0mm, head of a nail length overall 16mm, the long 8mm of ear-flap wherein, head of a nail internal diameter 7.8mm, nut external diameter and its coupling; The long 25mm of pitman, external diameter 3mm.

Embodiment 2.

This utility model is made up of universal screw of common extensive region dentata and the universal screw that lifts of extensive region dentata, the long 20mm of the universal screw nail body of common extensive region dentata; The universal long 14mm of screw nail body, head of a nail length overall 20mm, the wherein long 12mm of ear-flap of lifting of extensive region dentata; The long 22mm of pitman.All the other are with embodiment 1.

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

Claims

1, traffic stud rod inner fixer behind the dentata of a kind of extensive region, it is characterized in that lifting screw (2) and pitman (3) is formed by the universal screw of common extensive region dentata (1), extensive region dentata are universal, the common extensive region universal screw of dentata (1) is made up of nail body (11), the head of a nail (12) and nut (13); The extensive region dentata is universal to lift the nail body (21) of screw (2) and nut (23) with the universal screw of common extensive region dentata (1), its head of a nail (22) is longer, be provided with waist shape V-arrangement depression (26) in the middle of the outer surface, depression the place ahead is identical with the head of a nail (12) of the universal screw of common extensive region dentata (1), and the rear then is an ear-flap (25); The head of a nail hollow of two kinds of universal screws of extensive region dentata is provided with female thread, the external screw thread coupling of this female thread and nut, and head of a nail both sides are respectively equipped with U-shaped groove (14) or (24); Head of a nail central authorities are provided with screw hole, and the nail body is just assigned in this; The width of the external diameter of pitman (3) and U-shaped groove (14) or (24) coupling is fixed in pitman with the U-shaped groove of two kinds of universal screws of extensive region dentata by the head of a nail with nut, traffic stud rod inner fixer behind the dentata of extensive region of the present utility model.