CN202060856U - Locking system of proximal femoral nail - Google Patents

Abstract

A novel locking system of a proximal femoral nail for proximal femoral fracture fixation consists of a main nail, two proximal hollow self-tapping lock nails and two distal self-tapping lock nails. The two proximal hollow self-tapping lock nails are different in design, the one which is at the distal side is a locking nail, the head part of the locking nail is provided with thick self-tapping threads with consistent thread pitches, the tail part of the locking nail is provided with thin threads which form the locking fixation with the main nail, the thread pitch of the thin threads is 1/2 of that of the thick threads of the head part, the thread directions of the head part and the tail part are consistent, and when the locking nail is tightened for one circle (360 degrees), an object to be fixed can obtain the pressure of one thin thread pitch; and the proximal hollow self-tapping lock nail which is at the proximal side is a pressing nail, and can slide in the hole of the main nail, so the fracture pieces can be pressed and fixed.

Description

Near end of thighbone is followed closely excellent locking system

Technical field

This utility model relates to a kind of excellent locking system of the fixed nail of human femur fractured near end that is used for.

Background technology

Fracture should fixedly secure so that patient's early ambulant promotes functional rehabilitation.At present, multiple slip nail rod commonly used or pegboard systems resected femur fractured near end in the clinical position comprise that dynamic hip screw and the Gamma nail in the marrow, reconstruction type intramedullary nail with lock, PFN, near end of thighbone that marrow is outer resist rotary-type intramedullary pin etc.The essential structure of its marrow being invaded by pathogen inside-fixture is that 1 piece of main nail from the close-by examples to those far off inserts in the femoral bone cavitas medullaris along the femur direction, and near-end is that 1-2 piece of screw (or screw blade) is fixed in the femoral head along the neck of femur direction, and far-end is that 1-2 piece of pinning is fixed in femoral shaft.Between the near-end pinning of these marrow inside-fixtures and main nail the slip effect is arranged all, promptly suffer from limb functional exercise when (as bearing a heavy burden) the near-end pinning slide backward and withdraw from, the nearside sclerite slides to the distally sclerite and obtains pressurization between sclerite, i.e. the dynamic property pressurization.Obviously, the pressurization of this dynamic property is that to obtain to fixedly secure with the distally sclerite be prerequisite.Usually, this dynamic property pressurization can promote union of fracture.Dynamic hip screw also is to rely on this dynamic property pressurization to promote union of fracture.But for some cases, this dynamic property pressurization will cause the failure of fracture fixation, for example two places are unsettled syntripsis between homonymy neck of femur and rotor, the damaged case of femoral trochanter portion outside cortex particularly, using existing various inside-fixtures after the reduction of the fracture fixes, early stage suffer from that limb bends and stretches functional exercise or when bearing a heavy burden down, because of the fracture pulverizing can not obtain held stationary, the near-end pinning continues to slide and withdraws from, cause fracture of femoral neck carrying out property cripetura displacement and internal fixation to lose efficacy, finally cause nonunion or malunion.

Summary of the invention

In order to overcome the deficiency of existing various near end of thighbone inside-fixture dynamic property pressurizations, this utility model provides a kind of near end of thighbone to follow closely excellent locking system, and the locking that can obtain near end of thighbone all kinds fracture during clinical practice is fixed.

The technical scheme that its technical problem that solves this utility model adopts is: main nail near-end is that 2 pieces of self-tapping hollow type pinnings are fixed, and far-end is fixed by 1 piece or 2 pieces of self-taped type pinnings, and main nail is inserted the back and relied on supporting sighting device to finish the two ends pinning to fix.The design of 2 pieces of near-end self-taped type pinnings is with fixture is different before, 1 piece of pinning of wherein remote side is a locking nail, head has the thick tapping screw thread of flight pitch unanimity, mid portion is a screw rod, and afterbody has fine thread, and its flight pitch is 1/2 of a head coarse-pitch thread, both hand of spiral unanimities, whenever screw pinning one circle (360 °), fixation can obtain the pressurization that length is 1 fine thread spacing, and main nail lock hole screws fixing for female thread designs with locking nail afterbody fine thread; Nearside is the pressurization nail for 1 piece partially, and head has the thick tapping screw thread of flight pitch unanimity, and mid portion is a screw rod, is the threadless afterbody that expands thereafter.Locate through Kirschner wire before 2 pieces of near-end pinnings are fixing, the pressurization nail of inclined to one side nearside of going ahead of the rest is fixing, to obtain the pressurization of fractured near end of thighbone interblock (if femoral trochanter portion outside cortical bone is pulverized or be damaged, the nearside pinning need rely on main nail can obtain to add press fit), the locking nail with remote side is locked in main nail again.Lock distal locking nail at last, and tighten main nail tail medicated cap and finish fixingly, can reach the fixing purpose of this nail-stick system locking.

The beneficial effects of the utility model are, pressurize the fixed while at fractured near end of thighbone, can obtain stable locking and fix, and are simple in structure, easy to operate.

Description of drawings

Below in conjunction with drawings and Examples this utility model is further specified.

Fig. 1 constitutes each exploded view of the present utility model.

Fig. 2 is the profilograph that near end of thighbone is followed closely excellent locking system embodiment.

1. main nails among the figure, 2. near-end self-tapping hollow type locking nail, 3. near-end self-tapping hollow type pressurization nail, 4. far-end self-taped type pinning, 5. master's nail tail medicated cap.

The specific embodiment

In Fig. 1, complete nail rod locking system connects near-end self-tapping hollow type locking nail 2 by main nail 1 and forms with pressurization nail 3, far-end self-taped type pinning 4 and main nail tail medicated cap 5.

In embodiment illustrated in fig. 2, the self-tapping hollow type pressurization nail 3 of inclined to one side nearside of going ahead of the rest is fixing, to obtain the pressurization of fractured near end of thighbone interblock, the self-tapping hollow type locking nail 2 with remote side is locked in main nail 1 again, locks far-end self-taped type pinning 4 at last, tightening tail medicated cap 5, to finish locking fixing.

Claims (2)

1. a near end of thighbone is followed closely excellent locking system, is made up of 1 piece of main nail, 2 pieces of near-end hollow self-taped type pinnings and 1-2 piece of far-end self-taped type pinning, it is characterized in that: 1 of remote side piece is locking nail in the near-end pinning, and it is fixing to form locking between main nail.

2. near end of thighbone according to claim 1 is followed closely excellent locking system, it is characterized in that: main nail near-end lock hole designs for female thread; The head design of near-end locking nail is thick tapping screw thread, and afterbody is a fine thread, and its flight pitch is 1/2 of a head coarse-pitch thread, both hand of spiral unanimities; This nail screws in the screw thread of its afterbody of back and realizes locking with the female thread of main nail near-end lock hole.

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