CN2734162Y - Distal end self-locking, proximal end cross-locking type intramedullary nail and matching localizer - Google Patents

Abstract

The utility model discloses a distal end self-locking, proximal end cross-locking type intramedullary nail and matching localizer. The utility model is a locking nail suitable for long bone fracture, comprising a main nail. The proximal end of the main nail is provided with a locking hole, and the lateral face of the main nail is provided with a dovetail groove in axial direction. A dovetail perch with a notch on the proximal end is inserted into the dovetail groove. The notch is blocked up on a screw nut on the proximal end of the main nail. The distal end of the main nail is provided with a lumen which is processed with long inclined holes on both sides. Two expansion nails are inserted into the inclined holes and movably connected with the tail section of the dovetail perch. The utility model solves the problem of the distal end lumen inner part self-locking of the locking nail, so the utility model can guarantee the nail locking succeed in one time. The locking nail is convenient and easy to be operated; very small damage is done to the fractured part of human body, so the utility model can satisfy the requirement of microtrauma.

Description

A kind of far-end self-locking, near-end interlocking formula intramedullary pin and supporting localizer

Technical field

This utility model relates to the intramedullary pin that Orthopeadic Surgery uses, and especially is applicable to the intramedullary pin of a kind of far-end self-locking of long tubular bone fracture.

Background technology

Interlocking intramedullary nail fixed length tubular bone fracture is a kind of internal fixation technology of inventing application over past ten years, and it is at intramedullary pin near-end and far-end locking nail hole to be arranged, and punching is plugged pinning and fixed on two joint knochenbruch.Be applied to when clinical, because pinning needs punch insertions outside bone, often look for inaccurate locking nail hole location difficulty, bigger to patient trauma, especially distal locking nail is often located and is forbidden and can't finish.Also has a kind of self-locking intramedullary nail at present as 03230898.1 patent, it is the elasticity forked nail that outside support is arranged at intra medullary nail far-end, though can self-locking in marrow, shortcoming is that elasticity forked nail compression strength and anti-rotation strength are not enough, the anti-rotation strength of near-end is also powerful inadequately, and is fixing unreliable.

Summary of the invention

The purpose of this utility model is to overcome the prior art deficiency, and a kind of fixing reliable, nimble intramedullary pin little to patient trauma of operation is provided.

Technical scheme is: comprise intramedullary pin master nail, at main nail near-end locking nail hole is arranged, it is characterized in that being processed with dovetail groove in main nail side in axial direction, insert the dovetail bar that near-end has recess in the dovetail groove, recess is stuck on the nut of main nail near-end; Be processed with tube chamber at main nail far-end, the tube chamber both sides are processed with long inclined hole.Insert two expanding nails by the long inclined hole in both sides, and flexibly connect with dovetail bar afterbody.The dovetail bar moves in dovetail groove during adjusting nut, makes expanding nail withdrawal tube chamber or stretches out from inclined hole, so that insert and be supported in the pulp cavity.

In addition, cooperate the use of this intramedullary pin to design a kind of localizer, the effect of localizer is when the manipulate proximal end pinning, and convenient the punching outside bone exactly found the position of intramedullary pin keyhole.

The structure of localizer is that on the hand-held frame of a bending, an end has locating hole, the other end is fixed a locating rod, the termination of locating rod is the dovetail shaped termination that cooperates with main nail dovetail groove, and behind main nail near-end insertion dovetail groove, its locating hole is corresponding with the near-end keyhole of main nail.

During use, at first insert intramedullary pin from knochenbruch, the precession nut opens the distal dilation nail and is fixed in the far-end marrow, and the locating rod with fixed mount inserts main nail dovetail groove again, punches in bone from locating hole, just directly finds the lockhole of main nail near-end accurately.After plugging near-end pinning interlocking, take off fixed mount, the near-end closing cover of screwing on gets final product.

The utility model has the advantages that flexible operation, far-end makes expanding nail stretch out tube chamber and reaches self-locking by the back-out of nut.Withdrawal earlier before using is inserted behind the pulp cavity to stretch out by precession nut expanding nail and is supported on the pulp cavity wall, thereby makes intramedullary pin fixing reliably at far-end, and anti-rotation strength is big.When taking out after the knitting, as long as screw out nut, the expanding nail withdrawal both can be extracted out easily.In addition, owing to distal locking nail no longer punches outside bone, to patient's not damaged.

In addition owing to designed localizer, can be exactly when the manipulate proximal end pinning from bone outside punching find the shrinkage cavity position, easy to operate and minimizing is to patient's damage.

Description of drawings

Fig. 1 is the cutaway view of front view; Fig. 2 is a vertical view, the open situation of far-end sealing nail when expressing user mode among the figure; Fig. 3 is a vertical view, expresses the state before using among the figure, i.e. the intraluminal situation of far-end sealing nail withdrawal; Fig. 4 is the A-A section amplification figure; Fig. 5 is the B-B section amplification figure; Fig. 6 is the C-C section amplification figure; Fig. 7 is a far-end D-D cutaway view Amplified image; Fig. 8 is the sectional drawing of a sealing nail front view; Fig. 9 is the sketch map of localizer; Figure 10 is a localizer operating position sketch map.

1-big envelope medicated cap among the figure, 2-precession nut, 3-dovetail bar, 4-proximal locking nail hole, 5-main nail, 6-dovetail groove, 7-screw, 8,10-distal dilation nail, 9-far-end closing cock, 11-far-end tube chamber, 12-inclined hole, 13-far-end female thread, 14-hand-held frame, 15-locating hole, 16-setscrew nut, 17-locating rod, 18-dovetail termination.

The specific embodiment

As Fig. 1 and shown in Figure 7, at first the far-end at main nail 1 processes tube chamber 11, and female thread 13 is gone up in processing in the tube chamber, goes up inclined hole 12 from the processing of tube chamber both sides; In axial direction whole section from close end to the tube chamber junction surface processes dovetail groove 6 in the side of leading nail 1, external screw thread is gone up in the processing of main nail near-end, reprocess adovetail bar 3 that cooperates with dovetail groove, the recess that cooperates with precession nut 2 is gone up in the near-end processing ofdovetail bar 3, and dovetail bar far-end adds the screw of screwing 7.Assembling process is at first precession nut 2 to be enclosed within the dovetail bar recess, againdovetail bar 3 is inserted dovetail groove 6, when being about to all inject, makes nut 2 precessions, advances the dovetail bar until the position that is inserted into tube chamber 11.This moment will be as shown in Figures 2 and 3 expandingnail 8 and 10 insert from inclined hole 12 respectively, be movably connected with the screw 7 of screwing on after the screw of dovetail bar far-end is aimed at, the far-end closing cock 9 of screwing on again seals tube chambers.Wherein the top of closing cock 9 is conical surfaces, is convenient to make expanding nail to skid off inclined hole 12.

Localizer has locating hole 15 at an end of handing frame 14 as shown in Figure 9, and the fixedly connected locating rod 17 of the other end has setscrew nut 16 to be used for the location on the locating rod 17.Locating rod 17 terminations are dovetail shaped termination 18, and termination 18 cooperates with main nail near-end dovetail groove 6, be inserted into the near-end of dovetail groove 6 when termination 16 after, must just in time locating hole 15 be aimed at the main proximal locking nail hole 4 that follow closely.

During use, regulate in expanding nail (as shown in Figure 3) retracted into lumen by screwing out nut 2, after inserting the knochenbruch pulp cavity, with specific purpose tool precession nut 2, expanding nail (as shown in Figure 2) is stretched out from inclined hole 12, be fixed on and carry out self-locking in the pulp cavity, (as shown in figure 10) is according to the position of localizer locating hole 15 then, locking nail hole 4 is found in punching on knochenbruch, carries out interlocking with the near-end pinning, takes off localizer.At last big envelope medicated cap 1 is screwed in main nail near-end, finishes whole process.When take out the healing back, extract the near-end pinning out from pulp cavity, back out big envelope medicated cap 1, screw out nut 2, in expanding nail 8 and the 10 automatic withdrawal tube chambers 11, easily intramedullary pin is released from pulp cavity with specific purpose tool.

Claims (4)

1, a kind of intramedullary pin comprises main nail, at main nail near-end lock hole is arranged, and it is characterized in that: on main nail side axial dovetail groove is arranged, insert the dovetail bar that near-end has recess in the dovetail groove, recess is stuck on the nut of main nail near-end; Be processed with tube chamber at main nail far-end, the tube chamber both sides are processed with long inclined hole, two expanding nails are inserted the back flexibly connect with dovetail bar afterbody from inclined hole.

2, intramedullary pin as claimed in claim 1 is characterized in that: main nail near-end has locking nail hole (4), is used for interlocking.

3, intramedullary pin as claimed in claim 1 or 2 is characterized in that: far-end tube chamber (11) has female thread, the sealing-plug of screwing on (9) sealing tube chamber, and the top of closing cock is the conical surface.

4, the localizer that is used of a kind of and claim 1, its structure is: on the hand-held frame of a bending, one end has locating hole, the other end is fixed a locating rod, the termination of locating rod is the dovetail shaped termination that cooperates with main nail dovetail groove, behind main nail near-end insertion dovetail groove, its locating hole is corresponding with the proximal locking nail hole of main nail.

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