CN206687762U - A kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture - Google Patents

Abstract

The utility model discloses a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture, including shell, screw and hangnail, the shell is the round-like structure of inner hollow, the top of the shell is provided with two relative the first grooves of position, on the housing top end second groove is respectively equipped with the inside of two edges vertical with two the first groove lines, a cylindrical crossbar is provided with second groove, the form and dimension of the screw side wall is identical with the inwall of the shell, the end of the screw is provided with the 3rd groove, and the hangnail is two.The utility model is free of harmful aluminium and vanadium, good biocompatibility, is not required to second operation taking-up, wound is can obviously reduce, while can induce bone cell growth, and it is larger with mandibular contact area, maintenance is good, the utility model is simple in construction, and manufacture craft is superior, and cost is relatively low, it is and cheap, tests prove that effect is preferable, there are preferable market prospects.

Description

A kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture

Technical field

It the utility model is related to medical instruments field, and in particular to a kind of beta-titanium alloy anticreep for Sagittal condylar fracture Nail.

Background technology

Mandibular condyloid process sagittal fracture (Saggital fracture of mandibular condyle, SFMC) is A kind of relatively rare and special intracapsular fracture, with image technology mature, Sagittal condylar fracture recall rate significantly improves. The open replacement and fixation (ORIF) of operation can reduce the generation of disorders of temporomandibular joint and arthrocleisis, but its narrow space and The special anatomical structure of condyloid process (being rich in cancellous bone, surface only has a thin layer compact bone) adds operating difficulty, conventional hand Art method is often difficult to reach preferable fixed effect, therefore is necessary to develop more rational fix while art formula is improved Device.

Numerous studies are directed to the more firm and minimally invasive fixed form of utility model at present, as mini Titanium plate for treatment is fixed and spiral shell Technique for fixing is followed closely, screw stationary phase is more simple and easy to do for mini Titanium plate for treatment, and dissection scope is smaller, does not damage lateral pterygoid muscle, indication It is more extensive, therefore at present mainly using screw technique to SFMC row Titanic micro-plates.Second National condylar fracture in 2015 And in arthrocleisis seminar, expert recommends to be worn with two 16mm long spiro nails to connect fixation, to avoid part rotation displacement of fracturing Or screw releases, but two screws add the risk of secondary fracture, or can not accommodate two spiral shells because fracture part is too small Nail.Study it is more also have lag screw and bioabsorbable interference screw, it is clinical now condyle to be dashed forward sagittal bone using lateral force screw technique Folds ORIF, fixed effect is preferable, but requires that fracture part is sufficiently large, is otherwise difficult to reach preferable retention even outside screw Reveal injured joint face and peripheral vessels nerve, cause arthrocleisis or osteomyelitis, and operation technique difficulty is big, to screw placement side To accuracy requirement it is high.Bioabsorbable interference screw mainly uses 16~18mm Bicortical-screw technologies, with the poly- breast of modified high intensity Sour (PLGA) is main material, and good biocompatibility, is finally degraded into carbon dioxide and water excretes, and is not required to second operation and takes Go out, but its intensity is low far beyond Titanium Alloy Screw, is not enough to bear powerful masticatory pressure, and produce hydroxyacetic acid after PLGA degradeds And lactic acid, acidic materials can be caused to accumulate unavoidably, in addition, the high strength absorbable screws on domestic market rely primarily on into Mouthful, such as hundred excellent Biofix of Finland, Japanese he likes imperial Fixsorb, high cost, it is wide in clinic to limit bioabsorbable interference screw General application.

Utility model content

To solve the shortcomings of the prior art, the utility model proposes a kind of β titaniums conjunction for Sagittal condylar fracture Golden anticreep nail, the utility model are free of harmful aluminium and vanadium in common medical titanium alloy TC4, good biocompatibility, Second operation taking-up is not required to, reduces operation wound, and it is larger with cancellous bone contact area, maintenance is good, the magnetic crust on its surface Glycan/BMP-2 nanometer figure layers have the function that to be sustained BMP-2, inducible bone cell growth.The utility model is simple in construction, system Make sophisticated technologies, cost is relatively low, and according to clinical verification, using effect is preferable, and cheap, there is preferable economic benefit.

To achieve the above object, concrete scheme of the present utility model is as follows：

A kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture, including shell, screw and hangnail, the shell be The round-like structure of inner hollow, the top of the shell are provided with two relative the first grooves of position, on the housing top end Second groove is respectively equipped with the inside of two edges vertical with two the first groove lines, one is provided with second groove Cylindrical crossbar, is designed with screw thread on the outer wall and inwall of the shell, the form and dimension of the screw side wall with it is described The inwall of shell is identical, and the end of the screw is provided with the 3rd groove, and the screw outer wall is provided with screw thread, and the hangnail is two Individual, one end of hangnail is semi-moon shaped flap, and the other end axle of the hangnail is connected at the cross bar of the second groove of the shell.

Further, the anticreep nail is made using beta-titanium alloy Ti2448 (Ti-24Nb-4Zr-8Sn), its springform Amount approaches with bone, avoids stress shadowing effect.

Further, the loose and porous structure that the shell is made by selective laser forming technique, the loose structure Controlled porosity.

Further, the surface of the shell, screw and hangnail has one layer of chitosan magnetic/BMP-2 nanoparticles. The chitosan magnetic/BMP-2 nanoparticles have the function that sustained release BMP-2, can stimulate the activity of Gegenbaur's cell, induced osteogenesis The growth of cell, slowly decalcification and the generation of osteoporosis around fracture caused by common alloy of titanium is avoided, is advantageous to fracture Quick healing.

Further, flap one end of the hangnail is sector, and the fan-shaped two sides of tail is parallel to each other, and its afterbody It is evenly distributed with multiple teeth groove.

Further, the length of the 3rd groove is identical with the diameter of the screw head, and the end of the screw is set There is chamfering.

Further, the depth of first groove is the 1/4-1/5 of the outer cover length.

Further, the screw is identical with the length of the shell.

Further, the top outward flange of the shell is provided with chamfering, prevents from causing two to bone during shell screws in Secondary wound.

The beneficial effects of the utility model：

1) the utility model plays fairly good anticreep effect using the design of hangnail, solves condyle of mandible sagittal bone The problem of rolling over the easy loose or dislocation of sclerite after operative reduction is fixed, a nail are that the fixation to fracture site can be achieved, and are promoted Union is entered.

2) the utility model is free of harmful aluminium and vanadium, and good biocompatibility, price is relatively low, is not required to secondary Operation is taken out, and is reduced wound and is reduced surgery cost, and the modulus of elasticity of used material approaches with bone, and avoiding should Power shadowing effect, the utility model shell are made by selective laser molding mode, and its side wall is loose structure, is advantageous to skeletonization The migration of cell, promote union, the utility model surface construction chitosan magnetic/BMP-2 nanoparticles, there is sustained release BMP-2 effect, can induce the growth of Gegenbaur's cell, so as to avoid caused by common alloy of titanium around fracture slowly decalcification and The generation of osteoporosis, further promotes union.

3) the fan-shaped afterbody of the utility model hangnail is provided with multiple teeth groove, increases the contact area of hangnail and bone, favorably In maintenance.

Brief description of the drawings

Fig. 1 is structure chart of the present utility model；

Fig. 2 is the structure chart of the utility model shell；

Fig. 3 is the structure chart of the utility model screw；

Fig. 4 (a) is the structure chart of the utility model hangnail；

Fig. 4 (b) is the front view of the utility model hangnail；

Fig. 4 (c) is the side view of the utility model hangnail；

In figure, 1- shells, 2- screws, 3- hangnails, the grooves of 4- first, the grooves of 5- second, the grooves of 6- the 3rd, 7- cross bars, 8- Teeth groove.

Embodiment：

The utility model is described in detail below in conjunction with the accompanying drawings：

As shown in figure 1, a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture, including shell 1, screw 2 and hangnail 3, the shell 1 is the round-like structure of inner hollow, and the top of the shell 1 is provided with two relative the first grooves 4 of position, Second groove 5, institute are respectively equipped with the top of shell 1 on the inside of two edges vertical with two lines of the first groove 4 State in the second groove 5 and be provided with a cylindrical crossbar 7, screw thread, the side of screw 2 are designed with the outer wall and inwall of the shell 1 The form and dimension of wall is identical with the inwall of the shell 1, and the end of the screw 2 is provided with the 3rd groove 6, the screw 2 Outer wall is provided with screw thread, and the hangnail 3 is two, and one end of hangnail 3 is semi-moon shaped flap, and the other end axle of the hangnail 3 connects At the cross bar 7 of the second groove of the shell, semi-moon shaped flap design makes hangnail 3 be pushed out inserting the process of cancellous bone In rotate into, can obviously reduce resistance, while can also avoid causing bone wound.

Further, the anticreep nail is made using beta-titanium alloy Ti2448 (Ti-24Nb-4Zr-8Sn), without to people Body harmful aluminium and vanadium, good biocompatibility, price is relatively low, and existing a variety of artificial implants have passed through state food medicine inspection The inspection of office, second operation taking-up is not required to, reduces wound and reduces surgery cost, and the modulus of elasticity of the beta-titanium alloy Approached with bone, avoid stress shadowing effect, while it also avoid fracture surrounding caused by common alloy of titanium slowly decalcification and bone The loose generation of matter, further promotes union.

Further, the shell 1 is made by selective laser molding mode, is loose structure, its adjustable porosity, has Beneficial to the migration of Gegenbaur's cell, promote union.

Further, the shell 1, screw 2 and 3 equal surface of hangnail are micro- with one layer of chitosan magnetic/BMP-2 nanometers Ball.The chitosan magnetic/BMP-2 nanoparticles have the function that to be sustained BMP-2, can stimulate the activity of Gegenbaur's cell, induce The growth of Gegenbaur's cell, slowly decalcification and the generation of osteoporosis around fracture caused by common alloy of titanium is avoided, is advantageous to The quick healing of fracture.

Further, flap one end of the hangnail 3 is sector, and the fan-shaped two sides of tail is parallel to each other, and its tail Portion is evenly distributed with multiple teeth groove 8, increases the contact area of nail and bone, can effectively prevent rotation and the bone of fracture part The loose or dislocation of nail, is advantageous to maintenance.

Further, the length of the 3rd groove 6 is identical with the diameter on the top of screw 2, the end of the screw 2 Provided with chamfering.

Further, the depth of first groove 4 is the 1/4-1/5 of the outer cover length.

Further, the screw 2 is identical with the length of the shell 1, supports hangnail 3 completely after ensureing screw 2 deeply Open, while can also ensure the intensity of whole nail.

Further, the tip edge of the shell 1 is handled through rounding, prevents from making bone during shell 1 screws in Into secondary insult.

Workflow of the present utility model is：

1) preauricular incision is taken, cuts skin and hypodermis, flap is peeled off in fascia parotidea masseterica superficial surface；

2) fascia parotidea masseterica is cut, parotid gland tissues is opened, appears remporomandibular joint ligament and capsular ligament, blunt separation condyle Soft tissue on the outside of prominent and condyle neck, appear fracture face, expand and reset gap, fracture part is sought according to CT-3D Reconstruction inspection；

3) fracture part is carefully clamped with curved bone holding forcep, condyle is reset to after proper treatment and is dashed forward on stump section, complete It is in the case of all reset, diameter 1.5mm drill point is directed inclined upwardly with the perpendicular direction of fracture face, dashed forward stump through condyle Drilling reaches inner side bone fragment deep layer, the depth survey screw way total length entered according to drill point, the bone that selection matches with screw way length Nail, in general nail length range is 14-18mm；

4) flap one end of hangnail 3 is threaded to enclosure, the shell 1 is threaded in screw way, after shell 1 screws in position, The screw 2 is screwed in shell, until the end of afterbody and shell 1 of screw 2 mutually maintains an equal level, now hangnail 2 is in cancellous bone Strut completely；

5) articular disc is resetted, is sewed up a wound.

It is not new to this practicality although above-mentioned specific embodiment of the present utility model is described with reference to accompanying drawing The limitation of type protection domain, one of ordinary skill in the art should be understood that on the basis of the technical solution of the utility model, ability Field technique personnel need not pay the various modifications that creative work can make or deformation still in protection model of the present utility model Within enclosing.

Claims (9)

1. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture, it is characterised in that including shell, screw and hangnail, institute The round-like structure that shell is inner hollow is stated, the top of the shell is provided with two relative the first grooves of position, described outer Second groove, second groove are respectively equipped with shell top on the inside of two edges vertical with two the first groove lines A cylindrical crossbar is inside provided with, screw thread, the form and dimension of the screw side wall are designed with the outer wall and inwall of the shell Identical with the inwall of the shell, the end of the screw is provided with the 3rd groove, and the screw outer wall is provided with screw thread, it is described fall Pierce as two, one end of hangnail is semi-moon shaped flap, and the other end axle of the hangnail is connected in the second groove of the shell At cross bar.

2. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described Shell, screw and hangnail are made using beta-titanium alloy Ti2448.

3. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described Shell is made by selective laser molding mode, is loose and porous structure, the controlled porosity of the loose structure.

4. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described Have one layer of chitosan magnetic/BMP-2 nanoparticles in the surface of shell, screw and hangnail.

5. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described Flap one end of hangnail for sector, the fan-shaped two sides of tail is parallel to each other, and its afterbody is evenly distributed with multiple teeth groove.

6. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described The length of 3rd groove is identical with the diameter of the screw head, and the end of the screw is provided with chamfering.

7. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described The depth of first groove is the 1/4-1/5 of the outer cover length.

8. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described Screw is identical with the length of the shell.

9. a kind of beta-titanium alloy anticreep nail for Sagittal condylar fracture as claimed in claim 1, it is characterised in that described The tip edge of shell is provided with fillet.