Femoral interlocking nailThis utility model relates to the improvement of medical science orthopaedics therapy apparatus, specifically is a kind of femoral interlocking nail, and it belongs to technical field of medical instruments.
The anti-intramedullary pin that revolves of a kind of self-locking is arranged in the orthopedic medical device of prior art.It is quincunx intramedullary pin, the plum-shaped structure complexity of its outer nail, and anti-revolving property is poor, and range of application is little.Flank of nail cooperates quite inconvenience of fitting operation in it with outer nail.It is appropriate not to the utmost that the interlocking inflexion point of inside and outside nail is provided with the position, and its self-lock force is less, makes intramedullary pin self-locking effect not firm sometimes.The upper end self-locking device of this intramedullary pin design, complex structure and excessive, and the effect of fracture not being pressurizeed to the limb muscle damage.Also have a kind of interlocking type intramedullary pin, though it has anti-revolving, the advantage of fixing-stable, this pin structure complexity, the fitting operation complexity, the specification requirement height need be operated under the x line, and this also has radiation injury to doctor and patient.
The purpose of this utility model is that a kind of novel femoral interlocking nail will be provided.This nail will have collection to be prevented revolving, the femoral interlocking nail of internal lock and three kinds of functions of pressurization and one.It is simple that this pin structure is wanted, and fitting operation is convenient, and fixedly fracture site is firm, helps osseous tissue and muscle growth and recover.
Task of the present utility model is finished by following technical scheme, developed a kind of femoral interlocking nail, it comprises: in, outer nail, the guide hole of nail two abduction empennages in the far-end of the hollow stem wall that it is followed closely at home and abroad is arranged with, the interior nail sleeve sliding fit that has the near-end female thread is in outer nailing entocoele, and two guide hole place abductions of nail are arcuation abduction empennage outside, it is characterized in that: the bar wall of following closely near-end outside is provided with one section anti-rotor, also be provided with external screw thread on the bar wall of this wing upper end, be combined with the pressurization nut on this screw thread, this medicated cap is followed closely on the proximal head admittedly outside together with the interior nail near-end bench port spiral shell of sleeve.
The anti-rotor of described outer nail the preceding paragraph, its axial length accounts for five～sixth of outer nail length overall, and its radial wings is wide to be 1/2nd～three of outer nail diameter.
Nail in described, the length of its arcuation abduction empennage is 1/4th～five of interior nail length overall, the tangential width of this empennage is 3/1/2nd～five of an interior nail diameter.
The described outer guide hole that nails on, its distance apart from outer nail tail end is 1/4th～five of an outer nail length overall.
Embodiment of the present utility model is described below in conjunction with the accompanying drawings:
Fig. 1 is the outer nail shape assumption diagram of femoral interlocking nail;
Fig. 2 is the interior pin structure cutaway view of femoral interlocking nail;
Fig. 3 is the general assembly structural representation of femoral interlocking nail.
Referring to Fig. 1～3, make the femoral interlocking nail of stainless steel.Comprise inside and outside nail 1,2.The guide hole 3 of 1 liang of abduction empennage 5 of nail in its far-end of following closely 2 hollow stem wall at home and abroad is arranged with.The interior nail 1 sleeve sliding fit that has near-end female thread 4 is followed closely in 2 inner chambers outside, and follows closely two guide holes, 3 place's abductions of 2 outside and be arcuation abduction empennage 5.This intramedullary pin is mainly followed closely 2 proximal stem walls outside and is provided with one section anti-rotor 6.Also be provided with external screw thread 7 on the bar wall of these wing 6 upper ends.Be combined with pressurization nut 8 on this screw thread 7.This medicated cap 8 is followed closely on 2 proximal heads admittedly outside together with interior nail 1 near-end bench port 9 spiral shells of sleeve.One section anti-rotor 6 on the outer nail 2 of this intramedullary pin design, its axial length is 60～65mm, accounts for 1/6 of outer nail 2 length overall 360mm; The radial wings of this wing 6 is wide to be 3～4mm, is 1/2 of outer nail 2 diameter phi 8～12mm.
The length of the arcuation abduction empennage 5 of the interior nail 1 of design is that 80～90mm is 1/4 of interior nail 1 total length 320mm; The tangential width of this empennage 5 is that 4～6mm is 3/5 of interior nail 1 diameter phi 7～10mm.
Guide hole 3 on the outer nail 2 of design, its distance at a distance of outer nail 2 tail ends are that 95mm is 1/4 of outer nail total length 360mm.Follow closely outside and also be provided with decompression groove 10 on the 2 bar walls, be beneficial to the moving and transmission pressure of liquid stream in the marrow, guarantee the physiological environment of osseous tissue, guarantee union of fracture.
Pressurization nut 8 its near-ends of design are positive hexagonal cylindricality, and far-end is cylindrical.These medicated cap 8 spiral shells are followed closely 2 near-ends admittedly outside and are helped pressurized fracture breaking joint place.
This intramedullary pin is applicable on the femoral shaft, stage casing fracture, drift bolt behind operative reduction or closed reduction.Concrete use operation is: earlier in the place's spear-point drill perforate of femoral greater trochanter pears shape nest, reuse pulp cavity expander expands marrow, and enlarges this greater trochanter top with the greater trochanter expander, measures the length of intramedullary pin.Diameter and length according to marrow expanding device are selected suitable intramedullary pin.The binding operating procedure is:
(1) the abduction empennage 5 of interior nail 1 is bounced back in the outer nail 2;
(2) will follow closely 2 more outward and connect, and insert in this pulp cavity, slowly squeeze into outer nail 2 with outer nail driver, until outer nail 2 be driven into touch greater trochanter till;
(3) interior nail driver is inserted outer the nail in the driver and and be threaded tightly, squeeze into interior nail with interior nail 1;
(4) follow closely the intrinsic pressurization nut 8 of spiral shell on 2 outside, binding operation so far finishes.
When bone injury healing after the regular period, can take out this intramedullary pin, the steps include:
(1) exposes the top of this intramedullary pin earlier, unload pressurization nut 8, connect outer nail extractor again and squeeze into a little earlier;
(3) connect interior nail extractor again, nail 1 in taking out;
(4), take out outer nail 2 at last by outer nail extractor.