CN109091217A - A kind of pinning and lockhole lock cross locking marrow nail system entirely - Google Patents

Abstract

The invention discloses a kind of pinning and lockholes to lock cross locking marrow nail system entirely, the shape of the middle part roofbolt of the lockhole and pinning of the intramedullary nail is ellipse or oblateness, pinning is inserted into the lockhole of intramedullary nail, rotates pinning, and the lockhole and pinning of intramedullary nail reach locking.Roofbolt is ellipse or oblateness in the middle part of the pinning, and the polished rod column of the pinning can have multiple longitudinal ellipses or oblate through-hole.Roofbolt in the middle part of pinning is slightly less than the lockhole on intramedullary nail, is mutually matched between two.After surgical procedure bit bore, pinning is inserted into the lockhole of intramedullary nail, rotates pinning certain angle, and the lockhole and pinning of intramedullary nail, which reach true locking, to be fixed.It is characteristic of the invention that biggish torsion can be used when rotation pinning, the torsion of rotation is not acted in cortical bone, is obtained the locking of true sufficiently lockhole pinning, is reached the fixation of fracture stabilization.

Description

A kind of pinning and lockhole lock cross locking marrow nail system entirely

Technical field

The present invention relates to the field of medical instrument technology, lock cross locking marrow nail system entirely more particularly, to a kind of pinning and lockhole System is related to a kind of improvement of cross locking marrow nail, improves.

Background technique

Cross locking marrow nail is a kind of medical instrument of more commonly used treatment fracture, belongs to the orthopedic fixation device in medical instrument Tool.Cross locking marrow nail is widely used to the interior fixation of the long bone fractures such as femur, shin bone, operation can closed reduction, fix tightly Gu promoting union.

However current cross locking marrow nail has some problems in design, will cause the failure of Fracture internal fixaiion.Wherein, remote lock Nail is difficult frequent occurrence, squeezes into order to facilitate pinning, and it is 0.3-0.5mm bigger than pinning outer diameter that intramedullary nail is designed as lockhole internal diameter, by There is gap between self-locking nail lockhole and pinning bar, makes to be also easy to produce shaking between locking of intramedullary nail and pinning bar, cause fracture Situations such as generating front and rear, left and right, rotary moveable influences the fixation of fracture.

Patent CN201510942264.3, which discloses one kind, prevents intramedullary nail with lock self-locking nail from moving back nail, when Intramedullary nailing, When muscle ligament forced contraction, self-locking nail is easily exited from interlocking hole, is processed on the lockhole of intramedullary nail identical with pinning Screw thread, can anti-retaining nail.But the screw thread in pinning and locking of intramedullary nail has gap, does not reach true complete locking, lock Still there is activity in nail and locking of intramedullary nail, fixation is still unstable.

Patent CN201620796202.6 discloses a kind of threaded cellular type intramedullary nail, which includes: bending sprig Ontology, the interlocking type threaded hole that nail ontology front end is arranged in, interlocking type threaded hole include: the Z axis that is sequentially arranged at intervals to screw thread Hole and Y-axis threaded hole, the design of thread pore structure can be convenient for users to determining whether are locking nail hole and pinning as the case may be Gap is needed, strong fixation is provided and biology fixes two kinds of optinal plans.There is screw thread on the locking of intramedullary nail of this patent, equally Be that the screw thread of pinning and the screw thread of locking of intramedullary nail have gap, reached a part fixed function, do not reach complete lock Determine effect.

Patent CN201410028448.4 discloses a kind of double-locking type intramedullary nail structure, and intramedullary nail structure has intramedullary nail Bar, screw one end are connected and fixed by screw thread and long bone, and the screw other end may pass through through-hole and be used to position medullary nailing rod, A kind of double-locking type intramedullary nail structure is provided, realizes that screw is located at one end outside long bone and can be threadedly coupled locking, screw with long bone One end inside long bone can be locked with medullary nailing rod, to realize double-locking, fix intramedullary nail position.But the hole Locking structure is arranged in position, and basic principle is a kind of setscrew fixation principle, it is necessary to rely on the one end being located at outside long bone Screw strength screws, and can be only achieved locking efficiency, but the screw strength of one end outside bone screws, it is necessary to intramedullary nail is first pulled, Reach lock state again, makes intramedullary nail laterally by abnormal stress, it is possible that fracture site there can be displacement, and is pinning mono cortex Bone fixation, fracture fixation are insecure.

Patent CN200920068286.1 discloses the cross locking marrow nail of a kind of lockhole and pinning bar transition fit, interlocking marrow The lockhole of interior nail is identical with pinning shank diameter, and cooperation is that a kind of transition is matched between the lockhole diameter on intramedullary nail and pinning shank diameter It closes, it is stable between the two, the movement of fracture site can be made to be reduced to the smallest degree.Although transition is matched between lockhole and pinning bar It closes, it is possible to provide fixing-stable, but still without true lock state is reached, pinning and locking of intramedullary nail are not completed to lock, bone It is to be improved to roll over stability maintenance.

Summary of the invention

For problem present in the relevant technologies, it is an object of that present invention to provide a kind of pinnings and lockhole to lock interlocking marrow entirely Interior nail system.To achieve the above object, The technical solution adopted by the invention is as follows: a kind of pinning and lockhole are locked entirely in interlocking marrow Nail system, the shape of the middle part roofbolt 5 of the lockhole 2 and pinning 3 of the intramedullary nail 1 is ellipse or oblateness, and is mutually matched. According to the present invention, the roofbolt 5 at the middle part of the pinning 3 is slightly less than the lockhole 2 of intramedullary nail.According to the present invention, the pinning 3 is light Roofbolt, 6 diameter of head end bar are slightly less than 4 diameter of tail end bar, the purpose is to be inserted into the lockhole 2 of intramedullary nail for pinning 3, and can be smoothly In the hole bored in insertion cortical bone.

This design: the roofbolt 5 in the middle part of pinning is slightly less than the lockhole 2 on intramedullary nail, is mutually matched between two, between Gap is smaller, and surgical procedure has higher standard, it is desirable that the precision that drills when distal locking nail is very high, relies on remote disclosed in inventor Hold accurate pinning technology, a kind of interlocking intramedullary nail distal end aim drill hole fine turning real-time indicating (ZL 20112005047.4), A kind of location hole offset of cross locking marrow nail sighting device correcting device (201420345843.0) again, a kind of intramedullary interlocking nail distal end The hollow stem and cortical bone of aiming are fixed device (201520998397.8), the achievable accurate boring procedure of distal locking nail.Drilling Pinning 3 is inserted into the lockhole 2 of intramedullary nail afterwards, since the middle part roofbolt 5 of pinning is ellipse or oblateness and locking of intramedullary nail Gap is smaller, rotates pinning certain angle, and the lockhole 2 and pinning 3 of intramedullary nail, which reach true locking, to be fixed, and can significantly improve fracture Fixed stabilization.

The utility model has the advantages that existing application technology, the dynamic hole design of the lockhole of conventional intramedullary nails, are oblong, it is oval Eccentricity is larger, is a kind of lockhole and the movable design of pinning requirement, and pinning merging is simple, brings fracture fixation is unstable to lack It falls into.The smaller ellipse of the eccentricity of locking of intramedullary nail of the invention, the feature of this lock mode maximum of intramedullary nail 1 is rotation Biggish torsion can be used when twist lock nail 3, it is that interlocking occurs between metal and metal that the torsion of rotation, which does not act in cortical bone, It is fixed, obtain true sufficiently locking, but to relatively fragile cortical bone do not damage or cortical bone on pierced by abnormal stress Swash, reaches the fixation of fracture stabilization.

And the polished rod column of the pinning 3 can have multiple longitudinal ellipses or oblate through-hole 7, at long bone distance end It when fracture, is generally fixed using dissection armor plate, the bad use of intramedullary nail.Of the invention a kind of pinning and lockhole lock interlocking marrow entirely Interior nail system is in remote fractured near end of fracturing in application, first using the polished rod column pinning 3 with through-hole 7 and 1 lateral locking of intramedullary nail solid It is fixed, reuse more pieces thinner and the matched pinning 3 of shape of through holes, it is remote to fix longitudinally through the through-hole 7 of polished rod column pinning Fractured near end.This fixation is fractured, and remote fractured near end mode is more stable, and surgical injury is small.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples.

Fig. 1 is the engagement mechanism schematic diagram of intramedullary nail of the invention；

Fig. 2 is pinning structural schematic diagram of the invention；

Fig. 3 is the schematic cross-sectional view of pinning of the present invention；

Fig. 4 is that the lockhole of intramedullary nail of the present invention and pinning lock fixed schematic diagram；

Fig. 5 is that the polished rod column of pinning of the present invention has the structural schematic diagram of through-hole.

In Fig. 1-5: 1. intramedullary nails, 2. lockholes, 3. pinnings, 4. pinning tail end bars, 5. pinnings middle part roofbolt, 6. pinning head ends Bar, the through-hole of 7. pinning bars.

Specific embodiment

As shown in Figs. 1-5, a kind of pinning and lockhole lock cross locking marrow nail system entirely, the lockhole 2 including the main nail of intramedullary nail 1 With pinning 3.The shape of the middle part roofbolt 5 of the lockhole 2 and pinning 3 of the intramedullary nail 1 is ellipse or oblate, two shapes Shape matches.The shape of the middle part roofbolt 5 of the lockhole 2 and pinning 3 of the intramedullary nail 1 can part-elliptical or part it is oblate, The roofbolt 5 at the middle part of the pinning 3 is slightly less than the lockhole 2 of intramedullary nail.The pinning 3 is polished rod column, and middle part roofbolt 5 is ellipse Round or oblate, 6 diameter of head end bar is slightly less than 4 diameter of tail end bar.The polished rod column of the pinning can have multiple longitudinal directions ellipse Round or oblate through-hole 7.It is drilled using sighting device of intramedullary nail frame, the accurate pinning technology in the disclosed distal end of dependence inventor, one Kind of interlocking intramedullary nail distal end aim drill hole fine turning real-time indicating, a kind of location hole offset of cross locking marrow nail sighting device are entangled again Equipment, the fixed device operation of the hollow stem and cortical bone that a kind of intramedullary interlocking nail distal end aims at, to operate precisely taking aim at for pinning Quasi- process.Two layers of cortical bone first is bored using drill bit identical with pinning head diameter, after completing the accurate boring procedure of distal locking nail, The drilling for expanding first layer cortex bone with drill bit identical with pinning tail diameter is reused, the length of pinning is measured, left and right is light Light rotation pinning 3, be inserted directly into pinning 3 to intramedullary nail 1 lockhole 2 and opposite side cortical bone in, due to the middle part roofbolt of pinning 3 5 is smaller for ellipse or oblate and locking of intramedullary nail gap, 3 certain angle of pinning is rotated by biggish torsion, in marrow The lockhole 2 and pinning 3 of nail 1, which reach true locking, to be fixed.Intramedullary nail, then fixed cortical bone are first fixed by pinning 3 to fix bone Folding, can significantly improve the stabilization of fracture fixation.Preferably, the polished rod column of the pinning can have multiple longitudinal ellipses or oblate Through-hole 7, the purpose is in the remote fractured near end of fracturing in application, first using the polished rod column pinning 3 with through-hole 7 and intramedullary nail 1 laterally Locking is fixed.Reuse more pieces thinner and the matched pinning 3 of shape of through holes come longitudinally through the through-hole 7 of polished rod column pinning Fixed remote fractured near end.This fixed form fixation is more stable, and surgical injury is small, and intramedullary nail is remote, fractured near end in long bone Using providing more choices.

The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention In range.

Claims (4)

1. a kind of pinning and lockhole lock cross locking marrow nail system entirely, in lockhole (2) and pinning (3) including intramedullary nail (1) The shape of portion's roofbolt (5) is ellipse or oblateness, it is characterised in that: pinning (3) is inserted into the lockhole (2) of intramedullary nail (1), rotation Twist lock follows closely (3), lockhole (2) and pinning (3) locking of intramedullary nail (1).

2. a kind of pinning according to claim 1 and lockhole lock cross locking marrow nail system entirely, it is characterised in that: the lock The roofbolt (5) for following closely the middle part of (3) is slightly less than the lockhole (2) of intramedullary nail.

3. a kind of pinning according to claim 1 and lockhole lock cross locking marrow nail system entirely, it is characterised in that: the lock Following closely (3) is polished rod column, and middle part roofbolt (5) is that ellipse or oblateness, head end bar (6) diameter are slightly less than tail end bar (4) diameter.

4. a kind of pinning according to claim 3 and lockhole lock cross locking marrow nail system entirely, it is characterised in that: the lock Multiple longitudinal ellipses or oblate through-hole (7) can be had by following closely on the polished rod column of (3).