CN2411762Y - Elastic self-locking medually inner nail - Google Patents

Abstract

The utility model relates to an elastic self-locking intramedullary nail belonging to medical equipment. The utility model provides an internal fixation object which can overcome the rotation between bone fracture ends in the mode of internal fixation of a shaft center for a bone fracture of a long pipe-shaped bone, and allows pressurization on the shaft center when a burden is loaded. The utility model achieves the purposes of simple structure, convenient operation, safety, practicality, few incisions, less damage, quick healing, and low cost. The utility model is characterized in that a lateral wing structure at the tail end of the utility model, an elastic three-flanged nail at the head end, and a nail body of the intramedullary nail are integral; a safety device which can control the cohesion state or the spring state of the elastic three-flanged nail is arranged in the shaft center; the safety device is composed of a safety rod provided with a safety cover, a safety spring and a safety washer; after the internal fixation is finished, the safety device can be extracted.

Description

The elasticity self-locking intramedullary nail

This utility model is a medical apparatus and instruments.

For the open reduction internal fixation of long tubular bone fracture, domestic and international state-of-the-art method is an intramedullary nail with lock interlocking internal fixation technology at present.Original steel plate of the method and common intramedullary needle internal fixation technology have had significant progress.It had both been controlled with the axle center fixed form, and fracture is far away, the rotation of near-end, allows axle center pressurization when bearing a heavy burden again.But it still has following shortcoming: 1, need be in the up 4-6 of a limbs otch, increased the damage chance of tissue, neural, blood vessel and infection of incisional wound, myelitic incidence rate.2, complicated operation needs the special aiming appliance of a cover, and requires the operator to grasp the strictness of this apparatus and the complicated operations program.3, the application of self-locking nail easily causes the separation between fracture end, the chance of the union of fracture of slowing down.4, cost an arm and a leg, increase patient's financial burden.

The purpose of this utility model is to adopt to expand marrow formula elasticity self-locking intramedullary nail internal fixation technology, realization overcomes rotation between fracture end with the axle center fixed form, axle center pressurization when allow bearing a heavy burden, reach simple in structure, easy to operate, otch is few, damage little (only needing 1-2 otch), heal soon, purpose that expense is low.

The purpose of this utility model is achieved in that expanding the design of marrow formula elasticity self-locking intramedullary nail has multiple model, and its head end becomes one by elastic nail holding screw and elasticity three-flanged nail, and its tail end center has plug to fix, and there is the flank structure caudal part both sides.Before the internal fixation, between T type bumper bar tail end and the safety washer relief spring effect is arranged, the elasticity three-flanged nail is cohesion state before finishing with the internal fixation that guarantees to reset under the protecting cap effect.

Before the art, at first select suitable model elasticity self-locking intramedullary nail standby.Expand marrow and finish the back and screw out plug with inner hexagon spanner, the guide threaded portion is screwed in elasticity self-locking intramedullary nail tail end, hammering guide forced section makes this hammer into the fracture near-end, wait to reset be satisfied with after again hammering make it into the fracture far-end and reach suitable length.At this moment, screw out guide, touch the tail end of T type bumper bar with Allen wrench, make protecting cap break away from the elasticity three-flanged nail, the elasticity three-flanged nail promptly automatically springs open to key tube wall, thus the rotation of the control fracture broken ends of fractured bone far away; And the rotation of the nearly broken ends of fractured bone of fracturing is by the flank structure control of elasticity self-locking intramedullary nail caudal part.Internal fixation finishes, and the tail end that friction clamp is clamped bumper bar can take out bumper bar, safety washer, relief spring.Screw in plug at last.

In the art, the hammer of elasticity self-locking intramedullary nail goes into or takes out to rely on guide.Guide is fixed by guide threaded portion and elasticity self-locking intramedullary nail tail end.Guide has long lead arm, and guide forced section and lead arm vertical design are to make things convenient for the external force effect; The guide handle of tilted direction arc design meets human body and grips characteristics, can make patient's safety that feels comfortably cool, and can be convenient to operation technique again.

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

Fig. 1 is the preceding vertical section of a this utility model internal fixation pie graph

Fig. 2 finishes the vertical section structural map of moment for this utility model internal fixation

Fig. 3 is the front elevation of another embodiment of this utility model

Fig. 4 is the vertical section structural map of guide

1. protecting caps, 2. elasticity three-flanged nails, 3. elastic nail holding screws, 4. elasticity self-locking intramedullary nail 5.T type bumper bars, 6. safety washers, 7. relief springs, 8. flanks, 9. plugs, 10. guide threaded portions, 11. lead arm, 12. guide forced sections, 13. guide handles among the figure

In Fig. 1, protecting cap (1) is welded as a whole with T type bumper bar (5), elasticity three-flanged nail (2) tightens up screw (3) by elastic nail and is connected with elasticity self-locking intramedullary nail (4), relief spring (7) is positioned between safety washer (6) and the T type bumper bar tail end, its elastic force guarantees that elasticity three-flanged nail (2) is cohesion state under the protecting cap effect before certain external force acts on T type bumper bar tail end.Flank (8) is a ramp structure, can pass in and out the rotor portions spongy bone easily, reaches to prevent nearly fracture end turning effort.After screwing, plug (9) just contacts with the tail end of bumper bar (5).

In embodiment illustrated in fig. 2, T type bumper bar (5) makes relief spring (7) reach maximum compression in certain external force effect following moment, its maximum compression distance is a bit larger tham protecting cap (1) and is broken away from elasticity three-flanged nail (2) tip Len req, at this moment, elasticity three-flanged nail (2) breaks away from protecting cap (1) and automatically springs open and act on the key tube wall.The intended diameter of protecting cap (1) is slightly smaller than within the elastic nail holding screw (3) footpath, the taking-up of T type bumper bar (5), safety washer (6), relief spring (7) after being convenient to internal fixation and finishing.

In Fig. 3, elasticity three-flanged nail (2) isosceles are arranged, and itself and elastic nail holding screw (3) are overall structure.

In described another embodiment of Fig. 4, guide threaded portion (10) are the tail end joining part of guide and elasticity self-locking intramedullary nail (4), and guide forced section (12) design is vertical with lead arm (11), to make things convenient for the external force effect.The guide handle (13) of tilted direction arc design meets human body and grips characteristics and operation technique requirement.

Claims (3)

1, a kind of elasticity self-locking intramedullary nail is made of intramedullary pin and the safety of being with the elasticity three-flanged nail, and it is characterized in that: the intramedullary pin tail end has the flank structure, and head end is fixed with the elasticity three-flanged nail, and safety are arranged in the axle center.

2, elasticity self-locking intramedullary nail according to claim 1 is characterized in that: the cohesion or state that flicks of elasticity three-flanged nail is controlled by safety.

3, elasticity self-locking intramedullary nail according to claim 1 is characterized in that: safety are the axle center internal fixation, and the bumper bar head end is fixed with protecting cap.Safety can take out after internal fixation is finished.

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